A gas-controlled quick exhaust valve capable of preventing overshoot

Abstract

The present invention discloses an air-controlled quick exhaust valve capable of preventing overshoot of opening, comprising a valve body, a valve core, a membrane cover and a diaphragm assembly for driving the valve core to move, the membrane cover is sealed and fixed to the valve body, an operating chamber is formed between the membrane cover and the valve body, the diaphragm assembly is arranged in the operating chamber, the membrane cover is provided with a signal interface connected to the operating chamber, the valve body is provided with an air inlet, an air outlet and a quick exhaust port that are connected to each other, one end of the valve core penetrates into the valve body and is slidably connected to the valve body, the other end of the valve core is arranged in the operating chamber and is fixed to the diaphragm assembly, and one end of the valve core penetrates into the valve body to press and seal the quick exhaust port. The present invention provides an air-controlled quick exhaust valve capable of preventing overshoot of opening, which can solve the problem of overshoot of opening in the slow closing process of an anti-surge regulating valve equipped with a quick exhaust valve, and ensure the stability and accuracy of the operation of the anti-surge regulating valve.

Description

Technical Field

[0001] The invention relates to the technical field of anti-surge valves, and in particular to a gas-controlled quick exhaust valve capable of preventing opening overshoot. Background Art

[0002] The anti-surge control valve is an important actuator of the compressor anti-surge system. The valve needs to have the regulation characteristics of fast opening and full closing. The valve is often required to reach the full open position within 0.5~2S. At this time, a quick exhaust valve needs to be configured in the control gas path of the valve to achieve rapid opening of the valve. However, ordinary quick exhaust valves can cause abnormal fluctuations in the valve during use, which seriously affects the stability and accuracy of the anti-surge control valve and brings certain safety hazards to the operation of the compressor.

[0003] Chinese patent application publication number CN201620780448.4, published on January 4, 2017, entitled "Quick Exhaust Valve", discloses a quick exhaust valve, including a valve body, a valve cavity is arranged in the valve body, a P port connected to the valve cavity is arranged at one end of the valve body, a valve seat is arranged at the other end of the valve body, a sealing ring is arranged between the valve seat and the valve body, and an R port connected to the valve cavity is arranged on the valve seat, an A port connected to the valve cavity is arranged at the valve body corresponding to the valve seat, a sealing gasket is arranged in the valve cavity, an annular clamping table matching the sealing gasket is arranged at one end of the valve cavity corresponding to the sealing gasket, and the other end of the sealing gasket abuts against the valve seat. However, in the quick exhaust valve, when the anti-surge regulating valve needs to reduce the opening, the air pressure in the P port 102 will drop. At this time, the high air pressure in the A port 103 will rebound the sealing gasket 13, causing the R port 111 to be temporarily connected with the A port 103, resulting in abnormal exhaust, so that the air pressure in the A port 103 drops excessively, resulting in a stroke overshoot phenomenon when the valve is normally adjusted. Therefore, it is necessary to design a gas-controlled quick exhaust valve that can prevent opening overshoot to solve the above problem. Summary of the invention

[0004] In order to overcome the problem in the prior art that an anti-surge regulating valve equipped with an ordinary quick exhaust valve will have an opening overshoot phenomenon during the slow closing process, the present invention provides an air-controlled quick exhaust valve that can prevent opening overshoot, which can solve the opening overshoot problem of the anti-surge regulating valve equipped with a quick exhaust valve during the slow closing process, and ensure the stability and accuracy of the anti-surge regulating valve.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A pneumatically controlled quick exhaust valve capable of preventing overshoot of opening comprises a valve body, a valve core, a diaphragm cover and a diaphragm assembly for driving the valve core to move, the diaphragm cover is sealed and fixed to the valve body, an operating chamber is formed between the diaphragm cover and the valve body, the diaphragm assembly is arranged in the operating chamber, the diaphragm cover is provided with a signal interface connected to the operating chamber, the valve body is provided with an air inlet, an air outlet and a quick exhaust port which are connected to each other, one end of the valve core penetrates into the valve body and is slidably connected to the valve body, the other end of the valve core is arranged in the operating chamber and is fixed to the diaphragm assembly, and one end of the valve core which penetrates into the valve body presses and seals the quick exhaust port.

[0007] In the above technical solution, the signal interface is connected to the output end of the valve positioner to receive the air pressure signal output by the valve positioner, the air inlet is connected to the main air circuit, the air outlet is connected to the actuator, and the quick exhaust port is connected to the atmosphere. During normal operation, the valve positioner outputs the air signal to the signal interface. At this time, the valve core presses and seals the quick exhaust port. The air-controlled quick exhaust valve is in a fully closed state, and the air inlet and the air outlet are connected. Since the air pressure in the valve body is greater than the external atmospheric pressure, the air pressure difference can further press the valve core and increase the sealing effect of the valve core. At this time, if the anti-surge regulating valve needs to be reduced from 90% opening to 50% opening, the air pressure of the signal interface and the air inlet will decrease accordingly, but as long as the air pressure in the operating chamber does not drop below the critical value, the diaphragm assembly can still press the quick exhaust port, and the quick exhaust port will not open. Only the air inlet and the air outlet are always connected. Therefore, the special quick exhaust valve will not have abnormal exhaust phenomenon, so there will be no opening overshoot phenomenon. When the anti-surge control valve needs to be fully opened quickly, it is only necessary to reduce the air pressure in the air inlet and the signal interface to make the air pressure in the operating chamber drop below the critical value. The diaphragm assembly will quickly reset the valve core, and the valve core will quickly connect the air inlet, air outlet and quick exhaust port. The compressed air in the actuator can be quickly exhausted from the air outlet to the quick exhaust port, achieving the requirement of rapid opening of the anti-surge control valve.

[0008] Preferably, the valve core includes a guide rod and a sealing plate, the sealing plate is arranged in the valve body, the sealing plate is adapted to the quick exhaust port, and the valve core is pressed and sealed by the sealing plate. The structure can increase the sealing effect of the valve core.

[0009] Preferably, a sealing end surface is provided on the inner end surface of the quick exhaust port, and a sealing ring is provided on the sealing end surface. The structure can enhance the sealing effect of the valve core.

[0010] Preferably, the diaphragm assembly includes a diaphragm body, a piston, a telescopic spring and a nut. The diaphragm body, the piston and the telescopic spring are arranged in the operating chamber. The piston and the nut are fixed to the valve core. The diaphragm body is arranged between the piston and the diaphragm cover. The valve body and the diaphragm cover press and seal the edge of the diaphragm body. The piston and the nut press and seal the middle part of the diaphragm body. The two ends of the telescopic spring are respectively connected to the piston and the valve body. The structure can realize the movement of the valve core through the air pressure signal received by the signal interface, thereby realizing the control of the opening and closing of the quick exhaust port. When the air pressure of the signal interface is higher than the critical value, the diaphragm body drives the piston and one side of the quick exhaust port to move, so that the valve core presses the quick exhaust port; when the air pressure of the signal interface is lower than the critical value, the telescopic spring drives the piston and moves away from the quick exhaust port, and the quick exhaust port opens.

[0011] Preferably, the diaphragm body divides the operating cavity into a first cavity and a second cavity, the first cavity is connected to the signal interface, and the second cavity is connected to the atmosphere. The structure can reduce the influence of the air pressure in the second cavity on the movement of the diaphragm assembly.

[0012] Preferably, the valve body comprises a valve main body and a guide sleeve, and the valve core is slidably connected to the guide sleeve.

[0013] Preferably, an O-ring is provided on the guide sleeve.

[0014] Preferably, the air inlet is connected to the signal interface via an external pipeline.

[0015] The beneficial effects of the present invention are as follows: the problem of opening overshoot in the slow closing process of the anti-surge regulating valve equipped with a quick exhaust valve can be solved, and the stability and accuracy of the anti-surge regulating valve can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the air-controlled quick exhaust valve in the fully closed state in the present invention;

[0017] Figure 2 It is a structural schematic diagram of the air-controlled quick exhaust valve in the fully open state in the present invention.

[0018] In the figure: valve body 1, air inlet 1.1, air outlet 1.2, quick exhaust port 1.3, valve body 1.4, guide sleeve 1.5, valve core 2, guide rod 2.1, sealing plate 2.2, diaphragm cover 3, signal interface 3.1, diaphragm assembly 4, diaphragm body 4.2, piston 4.3, telescopic spring 4.4, nut 4.5, operating chamber 5, sealing ring 6, O-ring 7. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] Embodiment 1:

[0021] like Figure 1 and Figure 2 As shown, a pneumatically controlled quick exhaust valve capable of preventing overshoot of opening comprises a valve body 1, a valve core 2, a membrane cover 3 and a membrane assembly 4 for driving the valve core 2 to move, the valve body 1 comprises a sealed and fixed valve body 1.4 and a guide sleeve 1.5, an O-ring 7 is arranged between the valve body 1.4 and the guide sleeve 1.5, the membrane cover 3 and the valve body 1 are sealed and fixed by screws, an operating chamber 5 is formed between the membrane cover 3 and the guide sleeve 1.5, the diaphragm assembly 4 is arranged in the operating chamber 5, the membrane cover 3 is provided with a signal interface 3.1 communicating with the operating chamber 5, the valve body 1.4 is provided with an air inlet 1.1, an air outlet 1.2 and a quick exhaust port 1.3 communicating with each other, the air inlet 1.1 and the signal interface 3.1 are communicated with each other through an external pipeline. The valve core 2 includes a guide rod 2.1 and a sealing plate 2.2 fixed to each other. One end of the guide rod 2.1 penetrates into the guide sleeve 1.5 and is slidably connected with the guide sleeve 1.5. The guide sleeve 1.5 is provided with an O-ring 7. The other end of the guide rod 2.1 is arranged in the operating chamber 5 and fixed to the diaphragm assembly 4. The sealing plate 2.2 is arranged in the valve body 1. The sealing plate 2.2 is adapted to the quick exhaust port 1.3. The end face of the sealing plate 2.2 presses and seals the quick exhaust port 1.3. A sealing end face is provided on the inner end face of the quick exhaust port 1.3, and a sealing ring 6 is provided on the sealing end face.

[0022] The diaphragm assembly 4 includes a diaphragm body 4.2, a piston 4.3, a telescopic spring 4.4 and a nut 4.5. The diaphragm body 4.2, the piston 4.3 and the telescopic spring 4.4 are arranged in the operating chamber 5. The piston 4.3 and the nut 4.5 are fixed to the valve core 2. The diaphragm body 4.2 is arranged between the piston 4.3 and the diaphragm cover 3. The valve body 1 and the diaphragm cover 3 press and seal the edge of the diaphragm body 4.2. The piston 4.3 and the nut 4.5 press and seal the middle part of the diaphragm body 4.2. The two ends of the telescopic spring 4.4 are respectively connected to the piston 4.3 and the valve body 1. A gasket is arranged between the diaphragm body 4.2 and the nut 4.5.

[0023] In the above technical solution, the signal interface 3.1 is connected to the output end of the valve positioner to receive the air pressure signal output by the valve positioner, the air inlet 1.1 is connected to the main air circuit, the air outlet 1.2 is connected to the actuator, and the quick exhaust port 1.3 is connected to the atmosphere. During normal operation, the valve positioner outputs an air signal to the signal interface 3.1. At this time, the valve core 2 presses and seals the quick exhaust port 1.3. The air-controlled quick exhaust valve is in a fully closed state, and the air inlet 1.1 and the air outlet 1.2 are connected. Since the air pressure in the valve body 1 is greater than the external atmospheric pressure, the air pressure difference can further compress the valve core 2 and increase the sealing effect of the valve core 2. At this time, if the anti-surge control valve needs to be reduced from 90% opening to 50% opening, the air pressure of the signal interface 3.1 and the air inlet 1.1 will decrease accordingly, but as long as the air pressure in the operating chamber 5 does not drop below the critical value, the diaphragm assembly 4 can still press the quick exhaust port 1.3, and the quick exhaust port 1.3 will not open. Only the air inlet 1.1 is always connected to the air outlet 1.2, so the special quick exhaust valve will not have abnormal exhaust phenomenon, and the opening overshoot phenomenon will not occur. When the anti-surge control valve needs to be fully opened quickly, it is only necessary to reduce the air pressure in the air inlet 1.1 and the signal interface 3.1, so that the pressure in the operating chamber 5 drops below the critical value, and the diaphragm assembly 4 will quickly reset the valve core 2, and the valve core 2 will quickly connect the air inlet 1.1, the air outlet 1.2 and the quick exhaust port 1.3, and the compressed air in the actuator can be quickly exhausted from the air outlet 1.2 to the quick exhaust port 1.3, so as to achieve the requirement of quick opening of the anti-surge control valve.

[0024] The beneficial effects of the present invention are as follows: the problem of opening overshoot in the slow closing process of the anti-surge regulating valve equipped with a quick exhaust valve can be solved, and the stability and accuracy of the anti-surge regulating valve can be ensured.

Claims

1. A gas-controlled quick exhaust valve capable of preventing overshoot, characterized in that: The diaphragm assembly comprises a valve body, a valve core, a membrane cover and a diaphragm assembly for driving the valve core to move. The membrane cover is sealed and fixed to the valve body, an operating chamber is formed between the membrane cover and the valve body, the diaphragm assembly is arranged in the operating chamber, the membrane cover is provided with a signal interface connected to the operating chamber, the valve body is provided with an air inlet, an air outlet and a quick exhaust port which are connected to each other and are not located on the same side, one end of the valve core penetrates into the valve body and is slidably connected to the valve body, the other end of the valve core is arranged in the operating chamber and is fixed to the diaphragm assembly, one end of the valve core penetrates into the valve body and presses and seals the quick exhaust port, the operating chamber is divided into a first chamber and a second chamber, the first chamber is connected to the signal interface, the second chamber is connected to the atmosphere, and the air inlet is connected to the signal interface through an external pipeline.

2. The gas-controlled quick exhaust valve capable of preventing overshoot of opening according to claim 1 is characterized in that: The valve core comprises a guide rod and a sealing plate. The sealing plate is arranged in the valve body and is adapted to the quick exhaust port. The valve core is pressed and sealed by the sealing plate.

3. The gas-controlled quick exhaust valve capable of preventing overshoot of opening according to claim 1 is characterized in that: A sealing end surface is arranged on the inner end surface of the quick exhaust port, and a sealing ring is arranged on the sealing end surface.

4. A gas-controlled quick exhaust valve capable of preventing overshoot of opening according to claim 1, 2 or 3, characterized in that: The diaphragm assembly includes a diaphragm body, a piston, a telescopic spring and a nut. The diaphragm body, the piston and the telescopic spring are arranged in an operating chamber. The piston and the nut are fixed to the valve core. The diaphragm body is arranged between the piston and the diaphragm cover. The valve body and the diaphragm cover press and seal the edge of the diaphragm body. The piston and the nut press and seal the middle part of the diaphragm body. The two ends of the telescopic spring are respectively connected to the piston and the valve body.

5. A gas-controlled quick exhaust valve capable of preventing overshoot of opening according to claim 1, 2 or 3, characterized in that: The valve body comprises a valve main body and a guide sleeve, and the valve core is slidably connected with the guide sleeve.

6. The gas-controlled quick exhaust valve capable of preventing overshoot of opening according to claim 5 is characterized in that: An O-ring is arranged between the valve body and the guide sleeve, and an O-ring is arranged between the guide sleeve and the guide rod.

7. A gas-controlled quick exhaust valve capable of preventing overshoot of opening according to claim 1, 2 or 3, characterized in that: The air inlet is connected to the signal interface through an external pipeline, the air inlet is connected to the main air path, the air outlet is connected to the actuator, and the quick exhaust port is connected to the atmosphere.

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