• 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 invention relates to a refrigeration system consisting of at least one compressor (1), a condenser / gas cooler (2), one or more evaporators (7) and a synthetic or natural refrigerant as an energy source. In transcritical refrigeration systems, a high-pressure throttle valve after the gas cooler (2) and a medium-pressure vessel (4) are usually provided between the gas cooler (2) and the evaporator (3). The medium-pressure tank serves as a separator by the liquid refrigerant is supplied to the throttle valve (6). The gaseous refrigerant is discharged via a further throttle valve (5), also called medium-pressure valve, into the suction line, or preferably, directly fed back to the gas cooler (2) via a medium-pressure compressor. According to the invention, a controllable ejector (3) with the necessary control method instead of the high-pressure valve provided today. The task of the controllable ejector (3), also called dynamic ejector or Venturi valve, is to interrupt the refrigerant circuit between the high-pressure and medium-pressure side at a standstill. In operation, the controllable ejector (3) is used to maintain a certain target pressure on the gas cooler side. As a third and essential function of the dynamic ejector (3) serves as a suction support of the usually provided compressor (1, 8) of the cooling points. The well-known ejector has the property to achieve a relative negative pressure at the nozzle outlet to the outlet pressure at the end of the diffuser. Under certain circumstances, this negative pressure can be recovered as suction support and thus as useful work from the expansion process and thus partially replaces the work of the usual compressors (1, 8). The controllable ejector (3) combines the properties of one or more ejectors with those of the high-pressure valve and therefore leads to a substantial simplification of the system with the same or similar properties as those of static Ejektoranlagen.
    公开号:CH712876A2
    申请号:CH01145/16
    申请日:2016-09-05
    公开日:2018-03-15
    发明作者:Hegglin Andres
    申请人:Hegglin Andres；
    IPC主号:
    专利说明:

    description
    Field of application and background of the invention The invention relates to a cooling system according to FIG. 1 comprising at least one compressor (1), one liquid / gas cooler (2), one or more evaporators (7) and a synthetic or natural refrigerant fuels. In transcritical refrigeration systems, a high-pressure throttle valve after the gas cooler and a medium-pressure vessel (4) are usually provided between the gas cooler and the evaporator. The medium-pressure tank serves as a separator by the liquid refrigerant is supplied to the throttle valve (6). The gaseous refrigerant is discharged via a further throttle valve (5), also called medium-pressure valve, into the suction line, or preferably fed directly to the gas cooler via a medium-pressure compressor. The invention relates to a controllable ejector (3) with the necessary control method instead of the high-pressure valve provided today.
    The object of the controllable ejector, also called dynamic ejector or venturi valve, is to interrupt the refrigerant circuit between the high-pressure and medium-pressure side at a standstill. In operation, the controllable ejector is used to maintain a specific target pressure on the gas cooler side. As a third and essential function of the dynamic ejector serves as suction support of the usually provided compressor of the cooling points. The well-known static ejector has the property of achieving a relative suppression of the discharge pressure at the end of the diffuser at the nozzle exit. This suppression can be recovered under certain conditions as suction support and thus as useful work from the relaxation process and thus partially replaces the work of the usual compressor (1).
    The use of static ejectors for the recovery of relaxation work is known. Today solutions are common, which provide one or more ejectors, each with a shut-off valve on the inlet side {driver side). In addition, each ejector requires a corresponding check valve on the sucking side of the ejector. In order to achieve a sufficiently precise desired value of the high pressure, we often additionally provide a high-pressure valve which takes over the "residual load", which is not discharged via the driver opening of the ejector (s). Furthermore, the execution of several static ejectors of different size in a housing is known, which in turn essentially require the above-mentioned additional elements shut-off valve and check valve. The provision of a controllable ejector instead of static ejectors with additional high-pressure valve brings an obvious advantage in the installation cost of a refrigerating machine, with the same or similar benefits.
    DESCRIPTION OF THE INVENTION The controllable ejector 2 consists essentially of a nozzle (1), a throttle body (2), a mixing and diffuser tube (3), and a motor drive (4), which allows to drive the throttle body in any position within its stroke range. The nozzle whose cross-section is dependent on the total power to be controlled, is in an axis to the throttle body, which can release more or less area of the nozzle over a certain stroke length. When the throttle body has reached its end position, it closes the nozzle in a form-fitting manner and thus prevents the flow. Cf. claim. The maximum stroke length releases the largest nozzle cross-sectional area and is located on the same axis in the opposite position. The drive, coupled to the throttle body can shift the same from a minimum end position to a maximum opposite end position. Cf. claim 3. The construction of the housing (5) is preferably selected so that nozzles can be replaced in order to adjust the controllable ejectors of a certain size performance can. The mixing and diffuser part are preferably combined in a tube-like structure and also releasably connected to the housing of the nozzle. This also allows a suitable mixing and diffuser tube to be combined with each nozzle. Cf. Claim 4.
    For the drive (4), a stepping motor is preferably selected, which can drive off the necessary stroke via a screw drive (6). The drive is controlled by a suitable electronics, which is known in the art to those skilled in the art. The electronics provided for this purpose can drive the drive or motor via a certain number of steps. The steps are chosen so that they are sufficient to drive through the entire hub. The number of steps determines the fineness of the individual step sizes, ie stroke sections. The method described here allows to carry out very small strokes and results in a very fine metering of the mass flow through the corresponding nozzle. The electronics can be designed so that the total stroke can be changed by selecting the total number of steps. This allows the maximum flow, known as Kvs value among experts, to be changed without the need for mechanical precautions. By setting options on the electronics, such as a selector switch, the total number of available steps can be set or select. The number of steps is preferably chosen so that the setting resolution remains the same for a small stroke or even improved. See claim 5.
    In order to check the suction of the ejector in operation, determine or simply document, a pressure sensor Fig. 1 (10) is provided between the recoil Fig. 1 (9) and the suction tube of the ejector. The evaluation is carried out by comparing the evaporation pressure, preferably also measured with a pressure sensor, and that of the suction pressure at the ejector. If the latter is lower than the evaporation pressure, gas is conveyed and the usual compressor Fig. 1 (1) relieved of work. Cf. claim 6.
    权利要求:
    Claims (11)
    [1]
    Observations show that the quasi-stationary operation of the ejector leads to significantly better results. A quasi-stationary state is achieved by leaving the high pressure to be regulated within a certain tolerance band without this being compensated. Cf. claim 7. In order to convert the forces of the rotating motor into a lifting movement, a screw drive Fig. 2 (6) is preferably used. Cf. claim 8. The sometimes occurring forces can lead to high stress and wear on the screw. By choosing a suitable material combination of steel and plastic, sliding properties and wear can be positively influenced. Cf. claim 9. Stepper motor drives are known in the refrigeration industry. There are several known methods of combining throttle body and drive. It is known to introduce the motor into the pressure chamber of the housing (valve), this requires a pressure-resistant and gas-tight cable design from the pressure chamber. Another form is the placement of the rotor in the pressure chamber and the stator outside of it. This requires special measures to maintain a sufficient magnetic flux and corresponding force of the motor. The solution proposed here transmits the power from the drive via a spindle (7) to the screw drive (6) outside the pressurized space. This allows the engine to be housed in a hood outside the pressurized enclosure. The spindle is guided by a gas-tight seal (8), which separates the gasbeaufschlagten part of the housing with the hood. Cf. claim 9. In order to provide additional security against a pressure build-up in the hood, a pressure relief valve Fig.2 (9) is provided in the hood that degrades it to the outside world at a certain target pressure. Cf. claim 10. Claims
    1. The inventor claims as follows: - A refrigeration system consisting of at least the following components - a compressor (1) - a condenser / gas cooler (2) - a throttle body (6) EV (expansion valve) - an evaporator (7) - a check valve (x) and a device which can change a given Ejektorgeometrie by a control signal of a corresponding control device, with the aim of influencing the flow of the driver nozzle between a maximum and a minimum flow.
    [2]
    2. A device equipped with the components listed under 1, which allows to completely prevent the flow.
    [3]
    3. A device equipped with the components and features listed under 1 and 2, which allows to vary the suction flow.
    [4]
    4. A device equipped with the components and features listed under 1 to 3, which allows to change the original geometry of the controllable ejector by replacing the nozzle and or diffuser tube.
    [5]
    5. A device equipped with the components and characteristics listed under 1 to 4, which allows to change the flow value with the same setting resolution (in the jargon variable Kv value) by means of selector switch.
    [6]
    6. A device equipped with the components and characteristics listed under 1 to 5, which allows to determine the pressure in the suction line between the ejector and the recoil.
    [7]
    7. A control method that allows, with the inclusion of the components and features listed in Figures 1 to 6, to move the controllable ejector to a specific position to achieve the highest possible suction power.
    [8]
    8. Embodiment of the device according to claim 1 to 7 which connects the throttle body with the motor via a screw drive.
    [9]
    9. Embodiment of the device according to claim 1 to 8 which connects the throttle body with the motor via a co-rotating screw drive and the material used for this purpose is made of self-lubricating plastic.
    [10]
    10. Embodiment of the device according to claim 1 to 9 with a spindle which protrudes from the pressure chamber in the engine / gear compartment and separated by a gas-tight spindle seal resp. is sealed.
    [11]
    11. Pressure relief valve, which secures the device according to 1 to 10 against an unexpected pressure increase in the engine / transmission housing.
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    同族专利:
    公开号 | 公开日
    CH712876B1|2020-12-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2020-01-31| NV| New agent|Representative=s name: PATENTANWALTSKANZLEI DAUB, CH |
    优先权:
    申请号 | 申请日 | 专利标题
    CH01145/16A|CH712876B1|2016-09-05|2016-09-05|Controllable ejector and refrigeration system with one controllable ejector.|CH01145/16A| CH712876B1|2016-09-05|2016-09-05|Controllable ejector and refrigeration system with one controllable ejector.|
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