Double-flow-direction pressure maintaining device

Abstract

The utility model relates to the technical field of pressure maintaining equipment of an industrial production system, in particular to a double-flow-direction pressure maintaining device which is reasonable in structure, easy and convenient to operate, capable of guaranteeing that pressure in the system is stable and accurate in adjustment and capable of solving the problems that the pressure of the system fluctuates drastically in the existing pressure adjusting process and the like. The compressed air main pipeline is provided with a first pressure transmitter used for detecting the pressure of a first pressure maintaining system pipeline, a second pressure transmitter used for detecting the pressure of a second pressure maintaining system pipeline, a first manual cut-off valve close to the first pressure maintaining system side and a second manual cut-off valve close to the second pressure maintaining system side. The servo adjusting valve is located between the first manual block valve and the second manual block valve, the control assembly comprises a PLC, a state indicator lamp and a display panel, and compared with the prior art, the automatic control device has the remarkable advantages of being reasonable in structure, reliable in work, easy and convenient to operate and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure maintaining equipment for industrial production systems, and specifically is a dual-flow pressure maintaining device with reasonable structure, simple operation, and the ability to ensure stable pressure in the system, precise regulation, and overcome the problems of large fluctuations in system pressure during existing pressure adjustment processes. Background Art

[0002] In industrial production, especially in tire manufacturing, it is necessary to match air compressor equipment (such as air compressors, etc.) that matches the required pressure according to the different pressures of the power medium used by the production equipment. In order to save costs, the equipment with different pressure requirements and the power system are separated and supplied by different air compressor equipment. At the same time, in order to ensure the safe and stable operation of the two separate systems, the two systems are connected in series, and a manual air flow valve is installed in the middle to control it. When the pressure on the low-pressure side fluctuates, the manual air flow valve can be operated to emergency flow air from the high-pressure side to the low-pressure side. However, there are problems with this operation method: (1) The manual valve requires personnel to operate and cannot quickly achieve precise control; (2) It tests the operator's emergency response and handling capabilities. If the operation is improper, the pressure of both systems will fluctuate, making the situation more serious; (3) The existing technology can only flow air in one direction, and the system on the pressure relief side has no low-pressure protection function. Summary of the invention

[0003] In view of the shortcomings and deficiencies in the prior art, the utility model proposes a dual-flow pressure maintaining device with reasonable structure, simple operation, and the ability to ensure stable pressure in the system and accurate regulation, thereby overcoming the problems of large fluctuations in system pressure during the existing pressure adjustment process.

[0004] The utility model achieves this through the following measures:

[0005] A dual-flow pressure-maintaining device is provided with compressed air main lines respectively used to connect two systems to be pressure-maintained, characterized in that the compressed air main line is provided with a first pressure transmitter for detecting the pipeline pressure of the first pressure-maintaining system, a second pressure transmitter for detecting the pipeline pressure of the second pressure-maintaining system, a first manual shut-off valve close to the first pressure-maintaining system side, a second manual shut-off valve close to the second pressure-maintaining system side, and a servo regulating valve located between the first manual shut-off valve and the second manual shut-off valve, and is also provided with a control component, the control component comprising a PLC controller, a status indicator light, and a display panel, wherein the PLC controller is respectively connected to the status indicator light, the display panel, the first pressure transmitter, the second pressure transmitter, and the servo regulating valve.

[0006] The status indicator light of the utility model comprises a servo solenoid valve working status indicator light and a working status indicator light for indicating the working status of the entire device.

[0007] The first pressure transmitter and the second pressure transmitter of the utility model are respectively connected to the PLC analog input module and the PLC controller, and are used to upload the pipeline pressure data collected by the first pressure transmitter and the second pressure transmitter to the PLC controller.

[0008] The utility model is also provided with a power supply circuit, in which a circuit breaker F1 is provided. The power supply circuit is connected to a PLC controller, and the power supply state of the device is controlled by setting the circuit breaker F1.

[0009] When the utility model is working, the standard air pressure values ​​in the first system to be pressure-maintained and the second system to be pressure-maintained and the minimum warning air pressure value are preset in the PLC controller. After the equipment is turned on, the first manual shut-off valve and the second manual shut-off valve are opened respectively, and the first pressure transmitter and the second pressure transmitter respectively arranged on the pipeline sections on both sides of the servo solenoid valve in the compressed air main line respectively collect the pipeline pressure data of the first system to be pressure-maintained and the second system to be pressure-maintained connected to both ends of the pipeline, and upload them to the PLC controller. When the pressure of the first system to be pressure-maintained / the second system to be pressure-maintained is higher than the standard air pressure value, and the pressure value of the second system to be pressure-maintained / the first system to be pressure-maintained is lower than the standard air pressure value, the servo regulating valve located on the compressed air main line is opened to transport the gas to the side with low air pressure. In this process, the first pressure transmitter and the second pressure transmitter are continuously used to collect the pressure data in the systems on both sides of the servo regulating valve, and the pressure values ​​are displayed and output through the display panel. When the pressure value of the system on the air supply side is reduced to the minimum warning air pressure value, the servo regulating valve is closed, and the display panel displays and outputs the pressure values ​​of the systems on both sides in the current state.

[0010] Compared with the prior art, the utility model can complete the bidirectional flow of airflow and precise adjustment of pressure value between two pressure maintaining systems through the application of PLC controller and servo regulating valve, and has significant advantages such as reasonable structure, reliable operation and simple operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attached Figure 1 It is a structural schematic diagram of the utility model.

[0012] Attached Figure 2 It is an electrical schematic diagram of an embodiment of the utility model.

[0013] Reference numerals: electric control box 1 , status indicator light 2 , display panel 3 , pressure transmitter 4 , servo regulating valve 5 , manual shut-off valve 6 , compressed air main pipeline 7 . DETAILED DESCRIPTION

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0015] As attached Figure 1As shown, the utility model proposes a dual-flow pressure-maintaining device, which is provided with a compressed air main line 7 for connecting two systems to be pressure-maintained, and the compressed air main line 7 is provided with a first pressure transmitter 4 for detecting the pipeline pressure of the first pressure-maintaining system, a second pressure transmitter 4 for detecting the pipeline pressure of the second pressure-maintaining system, a first manual shut-off valve 6 close to the first pressure-maintaining system side, a second manual shut-off valve 6 close to the second pressure-maintaining system side, and a servo regulating valve 5 located between the first manual shut-off valve 6 and the second manual shut-off valve 6. A control component is also provided, and the control component includes a PLC controller, a status indicator light 2, and a display panel 3, wherein the PLC controller is connected to the status indicator light 2, the display panel 3, the first pressure transmitter 4, the second pressure transmitter 4 and the servo regulating valve 5, respectively.

[0016] The status indicator light 2 of the utility model includes a servo solenoid valve working status indicator light and a working status indicator light for indicating the working status of the entire device.

[0017] The first pressure transmitter 4 and the second pressure transmitter 4 of the utility model are respectively connected to the PLC analog input module and the PLC controller, and are used to upload the pipeline pressure data collected by the first pressure transmitter 4 and the second pressure transmitter 4 to the PLC controller.

[0018] The utility model is also provided with a power supply circuit, in which a circuit breaker F1 is provided. The power supply circuit is connected to a PLC controller, and the power supply state of the device is controlled by setting the circuit breaker F1.

[0019] Example:

[0020] This example provides a dual-flow pressure-maintaining device that can achieve the purpose of bidirectional air-flow pressure maintenance, and is provided with a compressed air main line 7 for connecting two systems to be pressure-maintained, and the compressed air main line 7 is provided with a first pressure transmitter 4 for detecting the pipeline pressure of the first pressure-maintaining system, a second pressure transmitter 4 for detecting the pipeline pressure of the second pressure-maintaining system, a first manual shut-off valve 6 close to the first pressure-maintaining system side, a second manual shut-off valve 6 close to the second pressure-maintaining system side, and a servo regulating valve 5 located between the first manual shut-off valve 6 and the second manual shut-off valve 6, and a control component located in the electric control box 1, the control component includes a PLC controller, a status indicator light 2, and a display panel 3, wherein the PLC controller is connected to the status indicator light 2, the display panel 3, the first pressure transmitter 4, the second pressure transmitter 4 and the servo regulating valve 5 respectively;

[0021] The circuit schematic diagram of this example is shown in the attached Figure 2As shown, F1 is the power circuit breaker, K1 is the PLC controller, K2 is the PLC analog module, SB1 is the manual-automatic selection knob, SB2 is the servo valve manual opening button, B1 is the pipe A pressure transmitter, B2 is the pipe B pressure transmitter, H1 is the automatic status indicator, H2 is the servo valve opening indicator, and Y1 is the regulating servo valve;

[0022] This example is equipped with an operating electric control box 1. When the system is running, a pressure transmitter 4 will monitor the system pressure in real time. When any system pressure fluctuates, the status indicator 2 will flash (green light in normal state), and the PLC in the electric control box will issue a switch command to the regulating servo valve 5 according to the signal fed back by the pressure transmitter. Manual shut-off valves 6 are installed at both ends of the regulating servo valve for the action test and calibration of the servo valve in manual state.

[0023] For the sake of explanation, the minimum working pressure value of system A is set to 0.80 Mpa, and the minimum working pressure value of system B is set to 0.70 Mpa; when the power circuit breaker F1 is closed, the PLC controller is powered on and runs, and the PLC analog module K2 monitors the pressure values ​​of systems A and B through the pressure transmitter B1 of system A and the pressure transmitter B2 of system B. When the manual automatic selection knob SB1 is switched to the automatic position, the system enters the automatic operation state, and the automatic state indicator H1 lights up; in the automatic operation state, when the pressure in systems A and B is within the working pressure range (the allowable fluctuation range of the working pressure is set in the PLC program), the regulating servo valve Y1 does not act and is in the closed state;

[0024] When the pressure of system A is higher than the minimum working pressure of 0.80 Mpa, and the working pressure of system B is lower than 0.70 Mpa, system A will bleed gas to system B, and the PLC analog module K2 will output a signal to adjust the servo valve Y1 to open from small to large in stages. The opening size is determined by the real-time pressure of system A, and ensure that system A is not lower than the minimum working pressure of 0.8 Mpa. The servo valve opening indicator H2 will light up, and the air compressor equipment of system B will be turned on at the same time. After the pressure of area B is restored, stop the gas flow;

[0025] When the pressure of System A is lower than the minimum working pressure of 0.80Mpa, and the pressure of System B is higher than the minimum working pressure of 0.70 Mpa, gas will flow from System B to System A, and the PLC analog module K2 will output a signal to adjust the servo valve Y1 to open in stages from small to large. The size of the opening is determined by the real-time pressure of System B, and it is ensured that System B is not lower than the allowable minimum working pressure of 0.70 Mpa. The servo valve opening indicator H2 lights up, and the air compressor equipment of System A is turned on at the same time; after the pressure in Area A recovers to above 0.70Mpa, the gas flow stops.

[0026] Switch the manual / automatic selection knob SB1 to the manual position, and the system enters the manual operation state. The automatic state indicator H1 goes out. In the manual state, press and hold the servo valve manual opening button SB2 to adjust the servo valve Y1 opening from small to large to open in stages. Release the servo valve manual opening button SB2 to adjust the servo valve Y1 opening from large to small to close in stages. In the manual state, it cooperates with the manual stop valves on both sides, mainly used for the action test and calibration of the servo valve.

[0027] Compared with the prior art, the utility model can monitor the system pressure changes in real time through the PLC controller and the pressure transmitter. When pressure fluctuations occur, it can be adjusted in the first time and the action can be executed earlier; it reduces the involvement of personnel and is automatically controlled by the system with higher control accuracy; it can be bidirectionally connected, and the regulation stability of the two systems is stronger in emergency situations; it can be used as an automatic regulating valve, and operate normally for a long time to play a role in reducing pressure.

Claims

1. A dual-flow pressure-maintaining device, provided with compressed air main lines for connecting two pressure-maintaining systems, characterized in that: The compressed air main line is provided with a first pressure transmitter for detecting the pipeline pressure of the first pressure maintaining system, a second pressure transmitter for detecting the pipeline pressure of the second pressure maintaining system, a first manual shut-off valve close to the first pressure maintaining system side, a second manual shut-off valve close to the second pressure maintaining system side, and a servo regulating valve located between the first manual shut-off valve and the second manual shut-off valve. A control component is also provided, and the control component includes a PLC controller, a status indicator light, and a display panel, wherein the PLC controller is respectively connected to the status indicator light, the display panel, the first pressure transmitter, the second pressure transmitter and the servo regulating valve.

2. A dual-flow pressure-maintaining device according to claim 1, characterized in that: The status indicator lights include a servo solenoid valve working status indicator light and a working status indicator light for indicating the working status of the entire device.

3. A dual-flow pressure-maintaining device according to claim 1, characterized in that: The first pressure transmitter and the second pressure transmitter are respectively connected to the PLC analog input module and the PLC controller, and are used to upload the pipeline pressure data collected by the first pressure transmitter and the second pressure transmitter to the PLC controller.

4. A dual-flow pressure-maintaining device according to claim 1, characterized in that: A power supply circuit is also provided, in which a circuit breaker F1 is provided. The power supply circuit is connected to a PLC controller, and the power supply state of the device is controlled by setting the circuit breaker F1.

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