Compressor sealing and pressure stabilizing control mechanism and control method

Abstract

The invention provides a sealing and pressure stabilizing control mechanism and method for a compressor, and belongs to the technical field of compressors. The problems that the sealing and pressure stabilizing control precision of an existing compressor is low, the pressure intensity and sealing in the compressor cannot be monitored in real time, and the requirement for high-precision industrial application is difficult to meet are solved. The device comprises a compressor impeller, a pressure stabilizing control valve, a sealing monitoring box, a gas circulation pipeline and a control system, the compressor impeller, the pressure stabilizing control valve and the sealing monitoring box are all arranged on the gas circulation pipeline and connected with the control system, and the compressor impeller is arranged at the front end of the pressure stabilizing control valve in the gas flowing direction. And the gas circulation pipeline comprises a plurality of seamless steel pipe pipelines which are connected in sequence. The device is mainly used for sealing pressure stabilization control of the compressor.

Description

Technical Field

[0001] The invention belongs to the technical field of compressors, and in particular relates to a compressor sealing pressure stabilization control mechanism and a control method. Background Art

[0002] In the process of continuous development of industrial technology, compressors, as key power equipment, have been widely used in many fields. However, there are many problems in the actual application of existing compressor technology. In terms of sealing, the traditional compressor structure often cannot effectively solve the problem of gas leakage, and the sealing effect is unsatisfactory. This not only leads to the waste of gas during the operation of the compressor, reduces the energy utilization efficiency, but also may affect the operation stability of the entire system. For example, in some industrial production processes with high requirements for gas sealing, gas leakage may affect product quality, increase the defective rate, and thus increase production costs. In terms of pressure control, the pressure control accuracy of existing compressors is low, and it is impossible to monitor the pressure and sealing in the compressor in real time, which is difficult to meet the needs of high-precision industrial applications. Unstable pressure output may make the equipment connected to it unable to work normally, affecting the stability of the entire production process and product quality. For example, in some precision machining processes, pressure fluctuations may cause the machining accuracy to decrease and fail to meet the expected product specifications. In addition, due to the deficiencies in sealing and pressure control, the compressor requires more frequent maintenance and overhaul during operation, which undoubtedly increases maintenance costs, reduces production efficiency, and brings economic burdens to enterprises. Therefore, there is an urgent need for a new compressor seal pressure stabilization control method to overcome the defects of the prior art and improve the overall performance of the compressor. Summary of the invention

[0003] In view of this, the present invention aims to propose a compressor sealing and pressure stabilization control mechanism and control method to solve the problems that the sealing and pressure stabilization control accuracy of existing compressors is low, and the pressure and sealing in the compressor cannot be monitored in real time, making it difficult to meet the needs of high-precision industrial applications.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a compressor sealing pressure stabilizing control mechanism, which includes a compressor impeller, a pressure stabilizing control valve, a sealing monitoring box, a gas circulation pipeline and a control system, wherein the compressor impeller, the pressure stabilizing control valve and the sealing monitoring box are all arranged on the gas circulation pipeline and are all connected to the control system, the compressor impeller is arranged at the front end of the pressure stabilizing control valve along the gas flow direction, the air inlet of the gas circulation pipeline is provided with a first differential pressure sensor and a first temperature sensor, the air outlet of the gas circulation pipeline is provided with a second differential pressure sensor and a second temperature sensor, the first differential pressure sensor, the first temperature sensor, the second differential pressure sensor and the second temperature sensor are all connected to the control system, the gas circulation pipeline includes a plurality of seamless steel pipes connected in sequence, two adjacent seamless steel pipes are connected by an interface flange, and a sealing monitoring box is sleeved on the outer side of the interface flange.

[0005] Furthermore, the pressure-stabilizing control valve includes a valve body shell, a valve seat, a valve stem, a valve core and a valve stem controller. The valve seat is arranged at the bottom of the valve body shell and is connected to the gas flow pipeline. The valve stem controller is arranged at the top of the valve body shell and the output end of the valve stem controller is connected to the valve stem. The valve stem is moved inside the valve body shell by the valve stem controller, the bottom of the valve stem is connected to the valve core, and the valve core is moved inside the valve seat by the valve stem and cooperates with the mating surface inside the valve seat.

[0006] Furthermore, the valve stem controller is connected to a control system.

[0007] Furthermore, a stroke pointer is arranged on the valve stem, and a stroke scale matching with the stroke pointer is arranged on the valve body shell.

[0008] Furthermore, a packing seal is provided between the valve body shell and the valve seat.

[0009] Furthermore, the sealed monitoring box includes a box body, a sealing ring and a gas pressure sensor. The box body is sleeved on the outside of the interface flange. Sealing rings are arranged between both ends of the box body and the interface flange. A gas pressure sensor is arranged on the box body, and the gas pressure sensor is connected to the control system.

[0010] Furthermore, the box body of the sealed monitoring box is a split structure, and the box body includes an upper box body and a lower box body, and the upper box body and the lower box body are connected by fastening bolts.

[0011] Furthermore, the control system is a PLC control system.

[0012] The present invention also provides a control method for a compressor seal pressure stabilization control mechanism, and the control method is as follows:

[0013] The pressures of the air inlet and the air outlet of the gas circulation pipeline are P1 and P2 respectively, the flow rates of the air inlet and the air outlet of the gas circulation pipeline are V1 and V2 respectively, the temperatures of the air inlet and the air outlet of the gas circulation pipeline are T1 and T2 respectively, and the gas pressure value in the sealed monitoring box is A;

[0014] When the value of P2-P1 is equal to the system standard value, the pressure and valve core position of the pressure stabilizing control valve are kept unchanged. When the value of P2-P1 is not equal to the system standard value, the pressure and valve core position of the pressure stabilizing control valve are controlled until the value of P2-P1 is equal to the system standard value.

[0015] When the value of V2 is equal to the standard value set by the system, the current operating parameters of the system are kept unchanged. When the value of V2 is not equal to the standard value of the system, the compressor impeller speed and the value of the air inlet flow rate V1 of the gas flow pipeline are adjusted until the value of V2 is equal to the standard value of the system.

[0016] When the value of T2-T1 is equal to the system standard value, the heat exchange parameters of the system are kept unchanged. When the value of T2-T1 is not equal to the system standard value, the heat exchange parameters of the system are changed until the value of P2-P1 is equal to the system standard value.

[0017] When A is greater than 0, it is necessary to dismantle and inspect the sealing performance of the sealing part of the interface flange corresponding to the corresponding sealing monitoring box until the sealing performance of the part is qualified.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention provides a compressor sealing pressure stabilizing control mechanism and a control method, by arranging a pressure difference sensor and a temperature sensor at the air inlet and the air outlet of the gas circulation pipeline, collecting the parameters of the air inlet and the air outlet of the compressor through the pressure difference sensor and the temperature sensor, and controlling the sealing parameters of the pressure stabilizing control valve after processing by the control system, so as to realize the adaptive adjustment of the pressure difference between the air inlet and the air outlet within a certain range, so that the state of the compressor output gas can be accurately controlled, the system operation is ensured to be stable, and the reliability and stability of the compressor operation are improved;

[0020] 2. The present invention arranges a sealing monitoring box and a gas pressure sensor at the interface flange in the gas circulation pipeline of the compressor. By monitoring the pressure change in the box body of the sealing monitoring box, the leakage at the interface flange in the gas circulation pipeline can be accurately judged. After eliminating the interference of the ambient temperature change, when the pressure in the box body of the sealing monitoring box is greater than the ambient pressure, the leakage point can be found in time, thereby realizing effective monitoring of the leakage of the gas circulation pipeline, helping to take repair measures in time, avoiding the influence of gas leakage on the system balance, and reducing the potential safety hazards and energy losses caused by leakage;

[0021] 3. The present invention can dynamically adjust the sealing parameters according to the real-time operating status of the compressor, so that the sealing effect is always maintained in the best state, extending the service life of the sealing components and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a structural schematic diagram of a compressor sealing pressure stabilizing control mechanism according to the present invention;

[0024] Figure 2 The present invention is a schematic structural diagram of a sealing monitoring box in a compressor sealing pressure stabilizing control mechanism.

[0025] 1-gas circulation pipeline, 2-air inlet, 3-air outlet, 4-compressor impeller, 5-seal monitoring box, 6-control system, 7-valve body shell, 8-valve stem controller, 9-valve stem, 10-valve core, 11-stroke pointer, 12-stroke scale, 13-valve seat, 14-matching surface, 15-packing seal, 16-box body, 17-seamless steel pipe, 18-interface flange, 19-gas pressure sensor, 20-sealing ring, 21-fastening bolts. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0027] See also Figure 1-2The present embodiment is described as a compressor sealing pressure stabilizing control mechanism, which includes a compressor impeller 4, a pressure stabilizing control valve, a sealing monitoring box 5, a gas circulation pipeline 1 and a control system 6. The compressor impeller 4, the pressure stabilizing control valve and the sealing monitoring box 5 are all arranged on the gas circulation pipeline 1 and are all connected to the control system 6. The compressor impeller 4 is arranged at the front end of the pressure stabilizing control valve along the gas flow direction. The air inlet 2 of the gas circulation pipeline 1 is provided with a first pressure difference sensor and a first temperature sensor. The air outlet 3 of the gas circulation pipeline 1 is provided with a second pressure difference sensor and a second temperature sensor. The first pressure difference sensor, the first temperature sensor, the second pressure difference sensor and the second temperature sensor are all connected to the control system 6. The gas circulation pipeline 1 includes a plurality of seamless steel pipes 17 connected in sequence, and two adjacent seamless steel pipes 17 are connected by an interface flange 18. A sealing monitoring box 5 is sleeved on the outer side of the interface flange 18. A pressure difference sensor and a temperature sensor are provided at the air inlet 2 and the air outlet 3 of the gas circulation pipeline 1. The parameters of the air inlet and the air outlet of the compressor are collected by the pressure difference sensor and the temperature sensor. After being processed by the control system 6, the sealing parameters of the pressure stabilizing control valve are controlled, thereby realizing adaptive adjustment of the pressure difference between the air inlet 2 and the air outlet 3 within a certain range. This enables the compressor output gas state to be accurately controlled, ensures the stable operation of the system, and improves the reliability and stability of the compressor.

[0028] The sealing monitoring box 5 described in this embodiment includes a box body 16, a sealing ring 20 and a gas pressure sensor 19. The box body 16 is sleeved on the outside of the interface flange 18. Sealing rings 20 are arranged between the two ends of the box body 16 and the interface flange 18. The box body 16 is provided with a gas pressure sensor 19, and the gas pressure sensor 19 is connected to the control system 6. The sealing monitoring box 5 and the gas pressure sensor 19 are arranged at the interface flange 18 in the compressor gas circulation pipeline. By monitoring the pressure change in the box body 16 of the sealing monitoring box 5, the leakage at the interface flange 18 in the gas circulation pipeline 1 can be accurately judged. After eliminating the interference of ambient temperature changes, when the pressure in the box body 16 of the sealing monitoring box 5 is greater than the ambient pressure, the leakage point can be found in time, thereby realizing effective monitoring of the leakage of the gas circulation pipeline 1, helping to take repair measures in time, avoiding the impact of gas leakage on the system balance, and reducing the safety hazards and energy losses that may be caused by leakage.

[0029] In this embodiment, the first differential pressure sensor and the second differential pressure sensor are respectively used to measure the pressure and flow of the air inlet 2 and the air outlet 3 of the gas circulation pipeline 1, the first temperature sensor and the second temperature sensor are respectively used to measure the temperature of the air inlet 2 and the air outlet 3 of the gas circulation pipeline 1, and the gas pressure sensor 19 is used to measure the gas pressure value in the box body 16 of the sealed monitoring box 5.

[0030] The pressure-stabilizing control valve in this embodiment includes a valve body shell 7, a valve seat 13, a valve stem 9, a valve core 10 and a valve stem controller 8. The valve seat 13 is arranged at the bottom of the valve body shell 7 and is connected to the gas flow pipeline 1. The valve stem controller 8 is arranged at the top of the valve body shell 7 and the output end of the valve stem controller 8 is connected to the valve stem 9. The valve stem 9 is moved and arranged in the valve body shell 7 through the valve stem controller 8. The bottom of the valve stem 9 is connected to the valve core 10. The valve core 10 is moved and arranged in the valve seat 13 through the valve stem 9 and cooperates with the matching surface 14 in the valve seat 13.

[0031] The valve stem controller 8 described in this embodiment includes a driving motor and a mechanical transmission mechanism. The motor drives the valve stem 9 to perform linear motion through the mechanical transmission mechanism. Its specific structure and connection method with the valve stem 9 are all existing technologies and will not be described in detail here.

[0032] In this embodiment, the valve stem controller 8 is connected to the control system 6 , and the valve stem controller 8 converts the control signal output by the control system 6 into the linear motion of the valve stem 9 .

[0033] In this embodiment, a stroke pointer 11 is arranged on the valve stem 9, and a stroke scale 12 matching with the stroke pointer 11 is arranged on the valve body housing 7. The stroke pointer 11 and the stroke scale 12 are used to judge the opening of the pressure-stabilizing control valve, that is, the pressure of the valve core 10 and the gap between it and the matching surface 14.

[0034] In this embodiment, a packing seal 15 is provided between the valve body shell 7 and the valve seat 13 , and the packing seal 15 is used for sealing between the valve body shell 7 , the valve seat 13 and the valve stem 9 .

[0035] In this embodiment, the box body 16 of the sealed monitoring box 5 is a split structure, and the box body 16 includes an upper box body 16 and a lower box body 16 . The upper box body 16 and the lower box body 16 are connected by fastening bolts 21 .

[0036] In this embodiment, the control system 6 is a PLC control system. By collecting relevant signal parameters, the PLC control system monitors the changes of various parameters in real time, sets the control strategy according to the system requirements, and can automatically adjust to return to a stable state when the operating temperature and pressure difference parameters deviate from the settings. This control method is highly flexible and can adapt to different working conditions and operating requirements, ensuring stable operation of the compressor under various conditions.

[0037] The corresponding input parameters are adjusted through the PLC control system to achieve the purpose of controlling the output. In this embodiment, the degree of sealing can be used as an adjustment factor, which is achieved by changing the pressure and clearance between the pressure stabilizing control valve and the valve core 10. The sealing adjustment of the entire system is detected at multiple locations and concentrated in one place. By monitoring, leakage at other locations other than the control valve is eliminated, which can maximize the pressure control accuracy of the system and improve the system efficiency of the compressor.

[0038] This embodiment also provides a control method for a compressor seal pressure stabilization control mechanism, and the control method is as follows:

[0039] The pressures of the air inlet 2 and the air outlet 3 of the gas circulation pipeline 1 are P1 and P2 respectively, the flow rates of the air inlet 2 and the air outlet 3 of the gas circulation pipeline 1 are V1 and V2 respectively, the temperatures of the air inlet 2 and the air outlet 3 of the gas circulation pipeline 1 are T1 and T2 respectively, and the gas pressure value in the sealed monitoring box 5 is A;

[0040] When the value of P2-P1 is equal to the standard value set by the system, the pressure of the pressure stabilizing control valve and the position of the valve core 10 are kept unchanged. When the value of P2-P1 is not equal to the standard value of the system, the pressure of the pressure stabilizing control valve and the position of the valve core 10 are controlled until the value of P2-P1 is equal to the standard value of the system.

[0041] When the value of V2 is equal to the standard value set by the system, the current operating parameters of the system are kept unchanged. When the value of V2 is not equal to the standard value of the system, the speed of the compressor impeller 4 and the value of the flow rate V1 of the air inlet 2 of the gas flow pipeline 1 are adjusted until the value of V2 is equal to the standard value of the system.

[0042] When the value of T2-T1 is equal to the system set standard value, the heat exchange parameters of the system are kept unchanged. When the value of T2-T1 is not equal to the system standard value, the heat exchange parameters of the system are changed until the value of P2-P1 is equal to the system standard value. In this embodiment, a heat exchanger is used to adjust the temperature of the mechanism, wherein the structure of the heat exchanger and the heat exchange parameter adjustment thereof are both existing technologies and are not described in detail here.

[0043] When A is greater than 0, it is necessary to dismantle and inspect the sealing performance of the sealing portion of the interface flange 18 corresponding to the corresponding sealing monitoring box 5 until the sealing performance of the portion is qualified.

[0044] In this embodiment, the parameters of system parameter monitoring and feedback can be increased or decreased as appropriate according to actual needs, such as increasing the compressor speed detection or reducing the temperature detection of the air inlet 2.

[0045] This embodiment takes into account both system parameter feedback and leakage detection, which can not only effectively control the seal, but also monitor the system operation status in real time, providing strong support for the intelligent management and maintenance of the compressor, and improving the overall management level and economic benefits of the compressor operation.

[0046] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A compressor sealing pressure stabilization control mechanism, characterized in that: It comprises a compressor impeller (4), a pressure stabilizing control valve, a sealing monitoring box (5), a gas circulation pipeline (1) and a control system (6). The compressor impeller (4), the pressure stabilizing control valve and the sealing monitoring box (5) are all arranged on the gas circulation pipeline (1) and are all connected to the control system (6). The compressor impeller (4) is arranged at the front end of the pressure stabilizing control valve along the gas flow direction. The gas inlet (2) of the gas circulation pipeline (1) is provided with a first differential pressure sensor and a first temperature sensor. The gas outlet (3) of the gas circulation pipeline (1) is provided with a second differential pressure sensor and a second temperature sensor. The first differential pressure sensor, the first temperature sensor, the second differential pressure sensor and the second temperature sensor are all connected to the control system (6). The gas circulation pipeline (1) comprises a plurality of seamless steel pipes (17) connected in sequence. Two adjacent seamless steel pipes (17) are connected via an interface flange (18). The outer side of the interface flange (18) is provided with a sealing monitoring box (5).

2. A compressor sealing pressure stabilizing control mechanism according to claim 1, characterized in that: The pressure-stabilizing control valve comprises a valve body shell (7), a valve seat (13), a valve stem (9), a valve core (10) and a valve stem controller (8); the valve seat (13) is arranged at the bottom of the valve body shell (7) and is connected to the gas flow pipeline (1); the valve stem controller (8) is arranged at the top of the valve body shell (7) and the output end of the valve stem controller (8) is connected to the valve stem (9); the valve stem (9) is movably arranged in the valve body shell (7) through the valve stem controller (8); the bottom of the valve stem (9) is connected to the valve core (10); the valve core (10) is movably arranged in the valve seat (13) through the valve stem (9) and is matched with a matching surface (14) in the valve seat (13).

3. A compressor sealing pressure stabilizing control mechanism according to claim 2, characterized in that: The valve stem controller (8) is connected to the control system (6).

4. A compressor sealing pressure stabilizing control mechanism according to claim 2, characterized in that: The valve stem (9) is provided with a travel pointer (11), and the valve body shell (7) is provided with a travel scale (12) matching the travel pointer (11).

5. A compressor sealing pressure stabilizing control mechanism according to claim 2, characterized in that: A packing seal (15) is provided between the valve body shell (7) and the valve seat (13).

6. A compressor sealing and stabilizing pressure control mechanism according to claim 1, characterized in that: The sealed monitoring box (5) comprises a box body (16), a sealing ring (20) and a gas pressure sensor (19); the box body (16) is sleeved on the outside of an interface flange (18); sealing rings (20) are provided between both ends of the box body (16) and the interface flange (18); a gas pressure sensor (19) is provided on the box body (16); and the gas pressure sensor (19) is connected to a control system (6).

7. A compressor sealing and stabilizing pressure control mechanism according to claim 6, characterized in that: The box body (16) of the sealed monitoring box (5) is a top-bottom split structure, the box body (16) comprising an upper box body (16) and a lower box body (16), and the upper box body (16) and the lower box body (16) are connected via fastening bolts (21).

8. A compressor sealing pressure stabilizing control mechanism according to claim 1, characterized in that: The control system (6) is a PLC control system.

9. A control method for a compressor sealing pressure stabilizing control mechanism as claimed in claim 1, characterized in that: The control method is as follows: The pressures of the air inlet (2) and the air outlet (3) of the gas circulation pipeline (1) are P1 and P2 respectively, the flow rates of the air inlet (2) and the air outlet (3) of the gas circulation pipeline (1) are V1 and V2 respectively, the temperatures of the air inlet (2) and the air outlet (3) of the gas circulation pipeline (1) are T1 and T2 respectively, and the gas pressure value in the sealed monitoring box (5) is A; When the value of P2-P1 is equal to the standard value set by the system, the pressure of the pressure stabilizing control valve and the position of the valve core (10) are kept unchanged; when the value of P2-P1 is not equal to the standard value of the system, the pressure of the pressure stabilizing control valve and the position of the valve core (10) are controlled until the value of P2-P1 is equal to the standard value of the system; When the value of V2 is equal to the system set standard value, the current operating parameters of the system are kept unchanged; when the value of V2 is not equal to the system standard value, the speed of the compressor impeller (4) and the value of the flow rate V1 of the air inlet (2) of the gas flow pipeline (1) are adjusted until the value of V2 is equal to the system standard value; When the value of T2-T1 is equal to the system standard value, the heat exchange parameters of the system are kept unchanged. When the value of T2-T1 is not equal to the system standard value, the heat exchange parameters of the system are changed until the value of P2-P1 is equal to the system standard value. When A is greater than 0, it is necessary to dismantle and inspect the sealing performance of the sealing portion of the interface flange (18) corresponding to the corresponding sealing monitoring box (5) until the sealing performance of the portion is qualified.

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