• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The object of the invention is to propose a dead chamber (60) for an alternating compressor, in which a nut intended to cooperate via a thread with the rod of a dead space piston is formed by two elements cooperating with each other by means of a spring element for a threadless threading cooperation thus making it possible to achieve stable operation, operation by remote control and the like. This dead chamber comprises: a rod (59) which is provided on a dead space piston (58), which comprises a male screw and which is held in a non-rotational state by an anti-rotation element; a nut cooperating with the thread of the male screw; and first and second nut parts which form the nut and can cooperate with each other when compressed in their mutually opposite directions by means of a spring element, whereby the cooperation between the screw threads is devoid of play, and stable operation can be achieved even when a variable load acts on the rod (59).
    公开号:CH705559B1
    申请号:CH00469/13
    申请日:2011-08-09
    公开日:2016-10-14
    发明作者:Tateyama Shogo；Ooha Jyunji
    申请人:Japan Steel Works Ltd；
    IPC主号:
    专利说明:

    Technical area
    The present invention relates to a dead chamber for an alternative compressor, specifically an improved dead chamber in which a nut cooperating by threading with the stem of a dead space piston is formed of two components that can cooperate with the with each other through a spring element to provide thread-free threading cooperation between them, thereby enabling the compressor to provide stable operation, remote control operation, or the like.
    Context of the invention
    Among the solutions used to adjust the capacity of an alternative compressor, the dead chambers are known. Fig. 3 shows a typical dead chamber structure as described in JP-A-11-82 314.
    [0003] Referring to FIG. 3, the structure comprises: a dead chamber 3; a balancing device 6 in which a second piston member 7 slidably cooperates with a main body of the dead chamber 60 to divide a balancing chamber 61, the balancing chamber 61 communicating with a pressure chamber 2a through a passage communication device 62, the second piston element 7 being connected to a first piston element 4 by a first connecting rod 5, and the internal gas pressure of the pressure chamber 2a can be guided in the balancing chamber 61 while it is opposed to an adjustment chamber 31; and, a control device (the driving part of the dead chamber) 8 for moving the first piston element 4 in a given position in order to increase or decrease the capacity of the adjustment chamber 31. As an actuator, it is used a hydraulic device 11. To reduce the capacity of the compressor, the dead chamber 3 connected inside a cylinder 1, is open to increase the volume of dead space of the cylinder 1. In the reciprocating compressor, even when, after the completion of a repressing process, it enters an aspiration process, since the compressed gas remaining in the dead space volume portion of the cylinder 1 expands, the gas suction is not not carried out until the pressure inside the cylinder 1 drops below the suction pressure. When the volume of dead space increases, during the suction process, the volume occupied by the expansion gas increases and the suction quantity decreases accordingly. In this capacity control process, since the amount of gas to be compressed by a piston 2 is decreased, a saving in energy consumption can be achieved.
    [0004] FIG. 4 shows a variable capacity type reciprocating compressor structure utilizing a dead chamber, as described in JP-A-10-122138.
    [0005] FIG. 4 is a sectional view of a dead chamber forming a main portion of an alternating compressor, wherein the tapered rod portion on the forward end side 43t of a dead space adjusting rod 43 is disposed on a partition wall 41b of a cylinder cover 41 having a dead chamber 41a for closing a cylinder 40 housing a piston; the male screw of the screw shank portion on the base end side 43s of the dead space adjusting rod 43 threadably engages with the female screw of a rod support metal member 44 attached to a cover 42 to close the cylinder cover 41 to support the rod portion 43s on the metal support member 44 so that the dead space adjusting rod 43 can be located within a through hole conically shaped gas 41c allowing the dead chamber 41a and the gas compression chamber on the cylinder head side 40h of the cylinder 40 to communicate with each other; and the protruding end of the dead space adjusting rod 43 protruding from the metal rod support member 44 is connected to the output shaft of a stepping motor 45, whereby the adjusting rod dead space 43 rotates forwards or backwards to reciprocate in its longitudinal direction.
    Thus, by changing the dead space volume successively by remote control, the suction amount of the compressor is also changed successively. Even when the amount of gas required varies every hour depending on the process, only the amount of gas required can be compressed, resulting in an energy saving effect. Therefore, an apparatus which remotely controls the volume of a dead chamber by an actuator and automatically adjusts the amount of discharge required by a control unit using values measured according to the process conditions such as a discharge outlet.
    Technical problem
    The reason for the structure of the related art of FIG. 3 is used, is the following. The hydraulic cylinder can provide high power with a small actuator and, since the operating oil has very low compressibility, it can prevent vibrations due to variable loads. However, the capacity control piston (dead space piston) of the dead chamber connected directly to the gas compression chamber of this cylinder receives the variable pressure corresponding to the processes of suction, compression and discharge of gas in the cylinder, that is to say that large variable loads are applied to this piston.
    In addition, for example, in a compressor for strongly oxidizing the oxygen gas, in order to avoid the ignition of the hydraulic oil due to high pressure oxygen, a drive method is preferred. not using hydraulic pressure.
    In addition, in the structure of the related art of FIG. 4, the conical rod portion forming the forward end of the threaded rod portion is inserted into the conical shaped gas passage hole and the degree of communication with the dead chamber is adjusted according to the degree of this insertion. However, the narrowness of the gas inlet / outlet passage in the chamber poses a problem: the loss of pressure becomes important.
    In addition, although not shown, in a dead chamber operated by hand, using a drive method using a screw type actuator. In this case, it is feared that the threaded surface of the actuator is damaged by variable loads. In order to avoid this, in a dead chamber operated by hand, a structure is used in which another locking nut is attached at the end of the displacement of the piston to prevent damage to the actuator due to the striking of the Threaded surface by variable loads. However, remote control of the rotation of the two nuts requires a complicated mechanism. This mechanism is difficult to install, takes up space and is expensive, and also complicates the reliability of the compressor.
    Thus, an object of the invention is to provide a dead chamber for an alternative compressor in which a nut designed to cooperate by threading with the stem of a dead space piston is formed by two elements that can cooperate with each other. through a spring member to provide threaded engagement free of play between them, thereby enabling stable operation or operation by remote control and the like of the compressor.
    Solution to the problem
    The present invention provides a dead chamber for an alternative compressor, said reciprocating compressor comprising a cylinder comprising a suction port and a discharge port, a piston being provided inside the cylinder; an upper gas compression chamber and a lower gas compression chamber separated by the piston within the cylinder; the dead chamber comprising a dead-bed main body intended to be arranged on an upper part of the cylinder, the main body of the dead chamber comprising a control chamber and a back-pressure chamber, the control chamber being arranged to communicate with the upper compressor gas compressor chamber; a dead space piston provided inside the dead body main body; and a drive member for sliding the dead space piston; the dead chamber being configured to change a volume of the control chamber by sliding the dead space piston, the dead chamber further comprising: a rod provided on the dead space piston, comprising a male screw and maintained in a state without rotation by an anti-rotation element; a nut engageable by threading with the male screw, the nut including a first nut portion and a second nut portion; and a spring member; wherein the first nut portion and the second nut portion cooperate with each other via the spring member which tends to urge them in opposite directions relative to each other on the rod. The dead chamber further comprises a first gear provided on the outer periphery of the nut and a second gear provided on the drive member and engageable with the first gear, the stem and the dead space piston. being configured to be moved by the driving member. In the dead chamber, as backpressure of the dead space piston, second gear is provided on the drive member and meshing with the first gear, the pin and the dead space piston being configured to be moved by the driving element. In the dead chamber, as the back pressure of the dead space piston, an intermediate pressure is used between a suction pressure and a cylinder discharge pressure; or, as the back pressure of the dead space piston, the suction pressure of the cylinder is used. In addition, in the dead chamber, the spring member is a conical disk spring.
    Advantageous effects of the invention
    The dead chamber for the reciprocating compressor of the invention is configured as above. Therefore, the following effects can be offered.
    In the dead chamber for the reciprocating compressor which comprises: a cylinder comprising a suction port and a discharge port and a piston provided within the cylinder; an upper gas compression chamber and a lower gas compression chamber separated by the piston within the cylinder; a dead body main body, formed in the upper part of the cylinder, communicating with the upper gas compression chamber, and comprising a first chamber and a second chamber, against pressure; a dead space piston provided inside the dead body main body; and a drive member for sliding the dead space piston, the dead chamber being configured to change the volume of the first chamber, which communicates with the upper gas compression chamber by sliding the dead space piston, a rod is provided on the dead space piston, having a male screw and held in a non-rotational state by an anti-rotation member; a nut can threadly cooperate with the male screw; and a first nut portion and a second nut portion together form the nut and can cooperate with each other when compressed in their mutually opposite directions through a spring member. Therefore, since the spring member is inserted between the two nut parts and a load is previously applied to the female screw, the portions of the cooperating screws may be free of play, whereby even when Variable loads act on the rod, one can prevent the damage of the stem caused by the clashes of the threaded surfaces. In addition, forward and backward movements of the dead space piston are accomplished by rotating the female screw on the side of the cylinder forward and backward. In addition, in a state in which the dead space piston is stopped, since the force of the spring member acts on the threaded surface, even when variable loads act on the threaded surface, the threaded surface is still pushed in one direction and thus the friction force is applied thereto, thus preventing the movement of the dead space piston by its own operation.
    In addition, the dead chamber comprises a first gear provided on the outer periphery of the nut and a second gear provided on the drive member and engageable with the first gear, the rod and the piston. dead space being configured to be moved by driving the drive member. Therefore, by rotating the gears using the drive element to move the dead space piston forward and backward, the dead space volume can be changed by control to distance. When the control unit is configured to input an input signal from the process side and move forward and backward of the dead space piston to provide a necessary amount of gas, the capacity of the compressor can be adjusted automatically.
    The variable load acting on the dead space piston is considerably influenced by the suction / discharge pressure of the compressor, in addition to the mass of the constituent parts of the compressor and a back pressure to be applied to the chamber back pressure of the dead space piston. When the average pressure inside the cylinder is used to act on the backpressure chamber, the inside of the cylinder and the backpressure chamber are connected through a choke such as an orifice. Here, the same action can also be obtained by opening a thin hole communicating from the front surface of the dead space piston to the backpressure chamber. In this case, the structure can be simplified. However, since the magnitude of the load acting on the dead space piston varies considerably in the vertical direction, the restoring force to be applied between the nuts must be increased. In addition, the torque needed to rotate the nut to move the dead space piston increases.
    Also when the suction pressure is applied to the chamber against pressure, the magnitude of the load is the same as that described above. However, since the mass load is relatively smaller than the pressure load, an upward load is a major component and a downward load is a minor component. Therefore, the restoring force to be applied by the spring member can be reduced and thus the torque needed to rotate the nut can also be reduced.
    Brief description of the drawings
    [0018]<tb> Fig. 1 <SEP> is a schematic structural view of a dead chamber for an alternative compressor according to the invention.<tb> Fig. 2 <SEP> is an enlarged sectional view of the specific structure of the dead chamber of FIG. 1.<tb> Fig. <SEP> is a structural view of an alternative compressor of the related art.<tb> Fig. <SEP> is a sectional view of the main parts of another reciprocating compressor of the related art.
    Description of the embodiments
    Example
    Hereinafter, a preferred embodiment of a dead chamber for an alternative compressor according to the invention is described with reference to the drawings.
    [0020] Incidentally, the parts similar or equivalent to those of FIG. 3 are described using the same reference numerals.
    In FIG. 1, a cylinder 1 is installed on the compressor frame 1A, and a piston 2 to be driven through a piston rod 2c reciprocates within the cylinder. The cylinder 1 is a double action type cylinder which compresses the gases on both sides of the upper and lower surfaces of the piston 2 and comprises an upper gas compression chamber 2a and a lower gas compression chamber 2b, on the inside of which suction valves 12a, 12b and discharge valves 14a, 14b, respectively, are provided. These cylinder valves (suction valves 12a, 12b and discharge valves 14a, 14b) are check valves which are configured to be opened or closed passively due to a difference between the forward pressure and the back pressure.
    The cylinder 1 comprises a dead chamber 6 at its upper part. A volume of the dead chamber 6 can be modified by the driving portion 8 of the dead chamber.
    The cylinder 1 comprises a suction port 13a for sucking the suction gas A from the side of the suction valves 12a, 12b and a discharge port 13B to discharge the discharge gas B on the side of the discharge valves 14a, 14b.
    The dead chamber 6 comprises a pair of mounting flange portions 50 on both sides of its main body 60. The upper gas compression chamber 2a of the cylinder 1 and the back pressure chamber 51 of the main body of the chamber 60 communicate with each other to transmit power through a first pressure guide pipe 55 having a first choke 52.
    In addition, the suction port 13a for the suction gas A and the counterpressure chamber 51 communicate with each other through a second pressure guide pipe 55A having a second restrictor 54.
    Fig. 3 2 is a detailed enlarged view of the dead chamber 6 of FIG. 1. Inside the dead body main body 60, there is provided a dead space piston 58 comprising a scraper segment 56 and a guide segment 57 to be vertically movable.
    A rod 59 provided on the dead space piston 58 extends upwardly through a seal 72a and a seal fixing cover 72, which are respectively provided on the upper surface of the main body 60, to prevent leakage of gas inside the counterpressure chamber 51 out of the main body of the dead chamber 60 and the cover 70.
    The rod 59 comprises a male screw 59a in its upper part. On the outer periphery of the male screw 59a, there is provided a nut 74 having a female screw 73 cooperating by threading with the male screw 59a.
    The nut 74 comprises: a first nut portion 75 serving as an upper screw having the female screw 73; and a second nut portion 76 serving as a lower screw having the female screw 73. The respective nut portions 75, 76 are shaped so that, for example, they can slide slightly while they are compressed in the opposite directions by biasing a spring element 77 consisting of a conical disk spring or the like.
    The respective nut portions 75, 76 are shaped so that when a restoring force exerted by the spring element 77 reaches the optimum value and there is no longer any play of catching up between the screw 59a and the female screw 73, a set screw 78 is inserted from outside the second nut portion 76 to fix the relative position of the nut parts 75, 76.
    On the cover 70, there are several support portions 79 made of rod-shaped elements or the like. The end portion 84a of an anti-rotation member 84 provided on the rod 59 is configured so that it is guided in a vertical direction relative to the support portions 79, so that the rod 59 is allowed to rotate. move only vertically along a positive load direction C and a negative load direction D, but is prevented from rotating.
    A machine table 90 is fixed on the upper portions of the support portions 79. The nut 74 is held rotatably on the machine table 90 by a pair of bearings 91. On the outer periphery of the second nut portion 76 of the nut 74, a first gear 93 is fixed by means of a key 92.
    A driving element 94 consisting of a pneumatic motor or the like is provided on the upper part of the machine table 90 and a second gear provided on the rotating shaft 95 of the driving element 94. is engaged with the first gear wheel 93.
    Therefore, during the drive carried out by the drive member 94, the nut 74 rotates through the respective gear wheels 93, 96 to move the dead space piston 58 vertically and, by switching the air supply ports (not shown) of the drive member 94, the forward / backward rotation of the nut 74 can be realized. Thus, the driving portion 8 of the dead chamber of FIG. 1 is formed by the male screw 59a, the nut 74, the gears 93 and 96, the machine table 90, the support portions 79, the driving member 94 and the like mentioned above.
    We will now describe the operation of the dead chamber. As described above, when the drive member 94 is driven to rotate the nut 74 through the respective gears 93 and 96, since the nut portions 75 and 76 forming the nut 74 are compressed in their mutually opposite directions through the spring element 77, a load is previously applied to the female screw 73 (a pre-load). Therefore, because of the gas pressure applied to the dead space piston 58 and the preload, in order to rotate the nut 74, a relatively large torque is required. However, since the diameter of the first toothed wheel 93 is sized n times larger than that of the second toothed road 96, the nut 74 can be rotated easily by a large torque, obtained by a large reduction ratio. , and the play-free rotation produced by the cooperation between the male screw 59a and the female screw 73 can move the dead space piston 58 vertically with great precision, thus making it possible to modify the volume of the pressure control chamber of gas 31.
    In the above case, when the dead space piston 58 is moved, the volume of the back pressure chamber 51 is modified to cause compression and expansion of the gas. To avoid this, as shown in FIG. 1, the cylinder 1 and the backpressure chamber 51 are connected through the first pressure guide pipe 55 having the first restrictor 52. In addition, although the pressure inside the cylinder 1 varies between the pressures. suction and discharge with the vertical movement of the piston 2, the gas inlet and outlet caused by such a pressure variation with respect to the counterpressure chamber 51 can be properly limited by the first restrictor 52, by means of the counterpressure chamber 51 can be maintained at the average pressure of the suction and discharge pressures. In this case, a pressure corresponding to half of the suction / discharge pressure difference acts at each cycle on the dead space piston 58 alternately in the positive and negative directions C and D. (The state of actual load varies slightly depending on the difference between the section surface and the pressure receiving surface of the rod 59, and the mass of the dead space piston 58 and the rod 59.)
    In another method, as shown in FIG. 1, the suction port 13a or suction valve chamber 12A of the suction gas A of the cylinder 1 is connected (e) to the counterpressure chamber 51 by the second pressure guide pipe 55A having the second choke 54. Since the pressures of the suction port 13a and the suction valve chamber 12A vary due to the suction operation of the intermittent gas in the cylinder 1, it is preferable to arranging the second choke 54 in the intermediate portion of the second pressure guiding pipe 55A. In this case, a load corresponding substantially to the difference of suction and discharge pressure acts intermittently on the dead space piston 58 only in the positive direction C.
    The invention is not limited to the above embodiment, but can be properly modified and improved within the scope of the claims. And, the material, shapes, dimensions, numerical values, modes, number, installation locations and the like of the respective constituent elements in the above embodiment are arbitrary and are not limited to those described. above, provided that they can realize the invention defined in the claims.
    Although the invention has been described here specifically with reference to its specific embodiment, it is clear to those skilled in the art that different changes and modifications can be added without departing from the scope of the invention. claimed invention.
    The present application is based on the Japanese patent application (patent application 2010-182445), filed August 17, 2010, the contents of which are incorporated herein by reference.
    Industrial applicability
    With the dead chamber for the reciprocating compressor of the invention, for example, a capacity modification operation such as gas compression in a chemical plant or the like can be carried out by remote control.
    List of reference signs
    [0042]<Tb> 1: <September> Cylinder<Tb> 1A <September> chassis<Tb> 2: <September> piston<tb> 2a: <SEP> upper gas compression chamber<tb> 2b: <SEP> lower gas compression chamber<tb> 2c: <SEP> piston rod<tb> A: <SEP> suction gas<tb> B: <SEP> discharge gas<tb> C: <SEP> positive charge direction<tb> D: <SEP> Negative charge direction<tb> 6: <SEP> dead room<tb> 8: <SEP> training part of the dead room<tb> 12a, 12b: <SEP> suction valve<tb> 12A: <SEP> suction valve chamber<tb> 13a: <SEP> suction port<tb> 13b: <SEP> discharge port<tb> 14a, 14b: <SEP> discharge valve<Tb> 31 <September> room<tb> 50: <SEP> mounting flange part<tb> 51: <SEP> back pressure chamber<tb> 52: <SEP> first choke<tb> 54: <SEP> second choke<tb> 55: <SEP> first pressure guide pipe<tb> 55A: <SEP> second pressure guide pipe<tb> 56: <SEP> scraper segment<tb> 57: <SEP> guidance segment<tb> 58: <SEP> dead space piston<Tb> 59: <September> rod<tb> 59a: <SEP> male screw<tb> 60: <SEP> dead body main body<Tb> 70 <September> cover<tb> 71: <SEP> O-ring<tb> 72: <SEP> seal fixing cover<tb> 72a: <SEP> seal<tb> 73: <SEP> female screw<Tb> 74: <September> nut<tb> 75: <SEP> first part of nut (upper screw)<tb> 76: <SEP> second part of nut (lower screw)<tb> 77: <SEP> spring element (conical disc spring)<tb> 78: <SEP> adjustment screw<tb> 79: <SEP> support part<tb> 84: <SEP> anti-rotation element<tb> 90: <SEP> machine table<Tb> 91: <September> bearing<Tb> 92 <September> key<tb> 94: <SEP> workout element<tb> 93: <SEP> first gear wheel<tb> 96: <SEP> second gear wheel
    权利要求:
    Claims (7)
    [1]
    A dead room for an alternative compressor, said reciprocating compressor comprising:a cylinder (1) comprising a suction port (13a) and a discharge port (13b), a piston (2) being provided inside the cylinder (1); andan upper gas compression chamber (2a) and a lower gas compression chamber (2b) separated by the piston (2) within the cylinder (1),the dead chamber comprising:a dead-body main body (60) to be arranged on an upper part of the compressor cylinder (1), the dead-chamber main body (60) comprising a control chamber (31) and a back-pressure chamber ( 51), the control chamber (31) being arranged to communicate with the upper compressor gas chamber (2a) of the compressor;a dead space piston (58) provided within the dead body main body (60); anda drive member (94) for sliding the dead space piston (58),the dead chamber is configured to change a volume ofthe control chamber (31) by sliding the dead space piston (58), the dead chamber further comprising:a rod (59) provided on the dead space piston (58) and including a male screw (59a), the rod (59) being held in a non-rotational state by an anti-rotation member (84);a nut (74) threadingly engaging the male screw (59a), the nut including a first nut portion (75) and a second nut portion (76); and a spring member (77); and in whichthe first nut part (75) and the second nut part (76) cooperate with one another via the spring element (77) which tends to push them in opposite directions with respect to the other on the rod (59).
    [2]
    The still chamber for an alternative compressor according to claim 1, further comprising:a first gear (93) provided on an outer periphery of the nut (74); anda second gear (96) provided on the drive member (94) and engageable with the first gear (93),and wherein the rod (59) and the dead space piston (58) are configured to be moved by the drive member (94).
    [3]
    3. Spare chamber for an alternative compressor according to one of claims 1 and 2, wherein the counterpressure chamber (51) is arranged to be connected to the cylinder (1) of the compressor so that the pressure acting on the piston of dead space (58) in the backpressure chamber (51) corresponds to half of the difference between the suction pressure and the discharge pressure inside the cylinder (1) of the compressor, the chamber of against the pressure (51) being maintained at the average pressure of the suction and discharge pressures of the cylinder (1) of the compressor.
    [4]
    A reciprocating compressor dead room according to claim 3, comprising a first pressure guide pipe (55) and a first restrictor (52) arranged to connect the backpressure chamber (51) to the compressor cylinder (1). .
    [5]
    5. Chamber for an alternative compressor according to one of claims 1 and 2, wherein the counterpressure chamber (51) is arranged to be connected to the cylinder (1) of the compressor so that the pressure acting on the piston dead space (58) in the backpressure chamber (51) depends on the suction pressure of the compressor cylinder (1).
    [6]
    The reciprocating chamber of an alternative compressor according to claim 5, comprising a second pressure guide pipe (55A) and a second restrictor (54) arranged to connect the counterpressure chamber (51) to the suction port. (13a) of the cylinder (1) of the compressor.
    [7]
    7. A dead room for an alternative compressor according to one of the preceding claims, wherein the spring element (77) is a conical disk spring.
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    同族专利:
    公开号 | 公开日
    KR20130099917A|2013-09-06|
    KR101744370B1|2017-06-07|
    WO2012023463A1|2012-02-23|
    JP5210363B2|2013-06-12|
    TW201211392A|2012-03-16|
    TWI460351B|2014-11-11|
    CN103069164A|2013-04-24|
    JP2012041837A|2012-03-01|
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    法律状态:
    2020-06-30| PUE| Assignment|Owner name: BURCKHARDT COMPRESSION (JAPAN) LTD., JP Free format text: FORMER OWNER: THE JAPAN STEEL WORKS, LTD., JP |
    2020-07-31| NV| New agent|Representative=s name: DR. GRAF AND PARTNER AG INTELLECTUAL PROPERTY, CH |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2010182245A|JP5210363B2|2010-08-17|2010-08-17|Reciprocating compressor clearance pocket|
    PCT/JP2011/068206|WO2012023463A1|2010-08-17|2011-08-09|Clearance pocket for reciprocating compressor|
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