• 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:
    A switching solution for vacuum pumps or vacuum fans, whereby the vacuum difference between successive vacuum elements can be optimized by continuous control and thereby achieve a maximum vacuum level with the flow capacity or minimum energy used in the latter vacuum element.
    公开号:FI20180001A1
    申请号:FI20180001
    申请日:2018-01-03
    公开日:2019-07-04
    发明作者:Ari Lyijynen
    申请人:Aly Consulting；
    IPC主号:
    专利说明:

    METHOD FOR MAXIMIZING THE VACUUM LEVEL BY SUCCESSIVE USE OF FLOW CAPACITY BY SUCCESSIVE DRAINING AGENTS
    Field of the Invention
    The invention relates to a switching and regulating system according to the preamble of claim 1, which is used to maximize suction levels at the available capacity and thereby to maximize water removal in paper, pulp and board production and the corresponding process industry where water or liquid removal is required.
    Prior art
    At present, there is no commercial application for a control circuit according to the field of the invention. An attempt is made to group the dewatering elements, which are connected in different vacuum conditions, but in parallel, so that the difference in vacuum level between the dewatering elements is as small as possible. This arrangement makes sense and is logical; this minimizes the losses that occur when low-pressure air expands to a higher vacuum level, i.e., higher vacuum. However, such an arrangement is not capable of controlling the air volume of successive vacuum / dewatering means, for example the successive chambers of the suction rolls, and of the double or triple chamber suction boxes to achieve the maximum vacuum level in the latter vacuum member.
    It is an object of the present invention to provide a novel coupling solution whereby the vacuum level difference between successive vacuum elements can be optimized by continuous control and thereby achieve a maximum vacuum level with the flow capacity used in the latter dewatering means.
    Brief Description of the Invention
    The solution according to the invention is characterized by what is mentioned in the characterizing part of claim 1. The solution according to the invention is further characterized by what is stated in the protection claims 2-5.
    The present invention provides a novel coupling and control system that can maximize the vacuum level in the latter dewatering means with minimal flow capacity. The system operates with continuous adjustment, ie it optimizes the vacuum ratio of successive dewatering elements under continuously changing conditions.
    BRIEF DESCRIPTION OF THE DRAWINGS
    The invention will now be described in more detail by way of example, with reference to the accompanying Figures 1-2, in which:
    Figure 1 illustrates a preferred embodiment of the invention wherein the invention is coupled to a suction roll.
    Figure 2 illustrates an embodiment of the invention in which the invention is coupled to a double simulator.
    DETAILED DESCRIPTION OF THE INVENTION
    1-2, the method of the invention consists of two vacuum generators (1), either a pump or a fan, and their suction piping (2) and the control circuit (3) therebetween, as well as the vacuum end users, the first vacuum 5). The vacuum generator (1) has a motor (6) and, if desired, but not necessarily a frequency converter (7) for speed control. The control circuit (3) consists of three main pieces, i.e. the control valve (8), the control circuit (9) and the vacuum sensor (10). The first vacuum members (4) may also have their own throttle control valve (11), but if there are only two successive vacuum members (4) and (5), there is no need for a throttle control valve (11). Prior to the introduction of the control system according to the invention, the vacuum generators (1) are subjected to a sufficient vacuum, typically at a certain rotational speed of the vacuum generators (1). In principle, the latter vacuum element (5) must have a slight overcapacity which is led to the vacuum unit (4) preceding the regulation of the control circuit (3) by means of a valve (8). During the production of the papermaking machine or the like, the papermaking dewatering fabric (12), i.e. the wire or press felt, covers the dewatering means (4) and (5) together with the paper web (13). The porous dewatering fabric (12) conveys normal pressure air (15) inside and on its surface to the first vacuum member (4). If the dewatering means is a suction roll (14), the suction holes (16) of the suction roll (14), in addition to the dewatering fabric (12), also convey normal air (15) to the first negative pressure element (4). The amount of standard pressure air (15) varies with the age, porosity, purity of the dewatering fabric (12), and the speed of the paper machine and the geometry of the suction roll (14). In addition, the air permeability of the board, pulp, or paper web (13) produced varies with the basis weight of the product being manufactured. It is not advantageous to form a negative pressure higher than a certain vacuum in the first dewatering means (4), since it increases the amount and importance of the leaking air, i.e. the normal pressure air (15), in the negative air. Thus, optimal control of the flow capacity requires constant adjustment.
    It will be apparent to one skilled in the art that embodiments of the invention are not limited to the examples above, but may vary within the scope of the following claims. The adjustable process can be any process in which water or other liquid is removed from the final product by means of a vacuum.
    权利要求:
    Claims (5)
    [1]
    A system for maximizing the vacuum level with minimal suction energy by the second vacuum member (5) of the paper, board, pulp wire and press section, characterized in that the first vacuum members (4) and the second vacuum member (5) have vacuum generators (1) , partially connected together by means of a suction line (2) and a control circuit (3) so that a maximum negative pressure is formed on the latter vacuum element (5) with the available suction capacity.
    [2]
    A control method for implementing the system according to claim 1, located in the suction piping of a paper, pulp, board machine, characterized in that the capacitors of the vacuum generators (1) are controlled by frequency converters (7).
    [3]
    System according to the protection claim 1 or 2, characterized in that the vacuum sensor (10) of the control circuit (3) is connected to the suction pipe (2) of the latter vacuum element (5).
    [4]
    A system according to claim 1 or 2, characterized in that the control valve (8) adjusts the control valve (8) so that the latter vacuum element (5) and its suction pipe (2) have a maximum vacuum.
    [5]
    System according to one of the preceding claims, characterized in that the vacuum element (4 and 5) is a suction roll (14).
    类似技术:
    公开号 | 公开日 | 专利标题
    US4398996A|1983-08-16|Vacuum control system and method for dewatering fabrics
    US20080149292A1|2008-06-26|Machine for producing a fibrous web
    CN1282395A|2001-01-31|Method for making soft tissue
    US4172759A|1979-10-30|Paper-machine structure and method for subjecting a web to suction
    CN102575428A|2012-07-11|Combination of a press felt with a pressure roller covering and/or a suction roller covering for a paper machine
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    FI79729B|1989-10-31|VATTENAVLEDNINGSANORDNING.
    CN209385345U|2019-09-13|It is a kind of for molding the adaptive control system of factory's water-ring vacuum system
    US4551202A|1985-11-05|Vacuum control system and method for dewatering fabrics
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    同族专利:
    公开号 | 公开日
    FI128688B|2020-10-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2020-10-15| FG| Patent granted|Ref document number: 128688 Country of ref document: FI Kind code of ref document: B |
    优先权:
    申请号 | 申请日 | 专利标题
    FI20180001A|FI128688B|2018-01-03|2018-01-03|System for maximizing the vacuum level of the last negative-pressure member in a row of negative-pressure members with limited total capacity, and optimal control method for a row of negative-pressure members|FI20180001A| FI128688B|2018-01-03|2018-01-03|System for maximizing the vacuum level of the last negative-pressure member in a row of negative-pressure members with limited total capacity, and optimal control method for a row of negative-pressure members|
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