Electromagnetic valve switch with recoil structure for purging fuel oil

Abstract

The electromagnetic valve switch comprises an electromagnetic valve body and the back-flushing structure, an air inlet and an air outlet are formed in the two sides of the electromagnetic valve body, a gas channel is formed in the electromagnetic valve body, an electromagnetic control valve and a sliding valve are arranged in the electromagnetic valve body, and the back-flushing structure comprises a back-flushing shell and a pipe connector which are in threaded connection. The inlet end of the recoil shell is connected with an air outlet of the electromagnetic valve body, a recoil valve and a recoil valve sleeve are arranged in the recoil shell and slidably connected, a spring seat and a throttling nozzle are arranged in the pipe connector, a through hole is formed in the center of the spring seat, and the two ends of a second spring abut against the spring seat and the recoil valve. The throttling nozzle is arranged at the outlet end of the pipe connector. When high-pressure gas is introduced, the high-pressure gas is slowly decompressed by utilizing the elastic compression of the second spring and the damping effect of the throttling nozzle, so that the action speed of the slide valve is reduced, the impact force is reduced, the working pressure performance requirement of the electromagnetic valve switch in actual use is ensured, and the safety and the qualified rate of products are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbine air systems, and particularly to a solenoid valve switch with a recoil structure for purging fuel oil. Background Art

[0002] To ensure the normal operation of a gas turbine, it is necessary to purge the fuel pipeline, so a solenoid valve switch is required to control the air system.

[0003] The prior art CN111336018B discloses a solenoid valve switch with a slide valve structure for purging fuel oil, which includes a solenoid valve and a slide valve installed on a main housing. A gas flow passage is formed inside the main housing. The end baffle of the solenoid valve is tightly sealed against the annular surface of the valve seat. The slide valve is arranged in a bushing. The inside of the slide valve is a valve body cavity communicating with the gas flow passage. The valve body cavity is supported by a spring. The slide valve is provided with a slide valve air outlet hole. Gas inlets and gas outlets are formed on both sides of the main housing along the moving direction of the slide valve. The valve seat is provided with a vent hole communicating the valve body cavity with the outside atmosphere. When the solenoid valve is energized, the armature moves under the action of electromagnetic force against the elastic force of the spring. The valve body cavity communicates with the outside atmosphere, the air pressure in the valve body cavity decreases, and there is a pressure difference between the valve body cavity and the inlet. Air enters the valve body cavity through the gas inlet. Under the action of air pressure, the slide valve moves against the elastic force of the spring, and the gas inlet and the gas outlet are connected. The structure of the present invention is simple and has high reliability.

[0004] The above device can operate normally under low pressure conditions. However, under high pressure conditions, it is necessary to ensure the airtightness and normal operation of the solenoid valve switch, adjust the tightness between the expansion ring and the bushing to prevent the expansion ring from cracking due to the too-fast movement of the slide valve under high pressure. At the same time, under high pressure conditions, when the slide valve moves, it drives the stop pin to collide with the bushing multiple times. Due to the large impact force, the outer circle of the stop surface of the bushing is deformed, resulting in local dimensional tolerance exceeding, the gap between the slide valve and the bushing is unqualified, the slide valve is stuck and cannot return, causing the purging solenoid valve to be scrapped or repaired, affecting the safety of the product, and increasing the production cost of the product. Therefore, there is an urgent need for a solenoid valve switch that can reduce the pressure relief speed of high-pressure gas under high pressure conditions, thereby reducing the movement speed of the slide valve. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a solenoid valve switch with a recoil structure for purging fuel oil, which can reduce the pressure relief speed of high-pressure gas under high pressure conditions, reduce the impact force when the slide valve moves and the stop pin collides with the bushing, prevent the outer circle of the stop surface of the bushing from deforming due to excessive impact force and the slide valve from being stuck, ensure the working pressure performance requirements of the solenoid valve switch in actual use, and improve the safety and qualification rate of the product.

[0006] To achieve the above object, the present invention adopts the following technical solution: An electromagnetic valve switch with a recoil structure for purging fuel, comprising an electromagnetic valve body and a recoil structure. An air inlet and an air outlet are arranged on both sides of the electromagnetic valve body, and a gas passage is formed inside, and an electromagnetic control valve and a slide valve are provided. The slide valve is arranged in a bushing, and a valve body cavity communicating with the gas passage is arranged inside the slide valve. The valve body cavity is supported by a first spring. A packing ring is arranged between the outer wall of the slide valve and the bushing. A through hole is opened at the lower part of the bushing, and a retaining pin for limiting the movement range of the slide valve passes through the through hole. The electromagnetic valve body is also provided with a bleed port, and the electromagnetic control valve is used to control the opening and closing of the bleed port; The recoil structure includes a recoil housing and a pipe joint connected by threads. The inlet end of the recoil housing is connected to the air outlet of the electromagnetic valve body. A recoil valve and a recoil valve sleeve are arranged inside the recoil housing. The recoil valve is slidably connected with the recoil valve sleeve. A spring seat and a throttle nozzle are arranged inside the pipe joint. A through hole is opened at the center of the spring seat. The two ends of a second spring abut against the spring seat and the recoil valve respectively. The throttle nozzle is arranged at the outlet end of the pipe joint.

[0007] Preferably, a sealing ring is arranged between the recoil valve and the recoil valve sleeve.

[0008] Preferably, gaskets are arranged between the recoil valve sleeve and the recoil housing and between the recoil valve sleeve and the pipe joint respectively.

[0009] Preferably, the throttle nozzle is threadedly connected to the inner wall of the outlet end of the pipe joint.

[0010] Preferably, the slide valve is provided with protrusions at the upper and lower parts respectively, and the retaining pin is arranged between the two protrusions.

[0011] Preferably, the packing ring is sleeved on the protrusion of the slide valve.

[0012] Preferably, the air inlet and the air outlet are arranged alternately on both sides of the electromagnetic valve body.

[0013] Advantages of the present invention: Compared with the prior art, by setting the recoil structure in the present invention, when high-pressure gas enters from the inlet end of the recoil housing, the gas pressure acts on the recoil valve, forcing the recoil valve to move to separate the recoil valve sleeve and the recoil valve. The second spring is compressed. The high-pressure gas enters the pipe joint through the gap and flows out through the throttle nozzle; Through the elastic compression of the second spring and the damping effect of the throttle nozzle, the high-pressure gas is slowly depressurized, preventing the air pressure at the air outlet from being released too quickly, resulting in excessive impact force when the retaining pin collides with the bushing during the movement of the slide valve and causing deformation; And when the high-pressure gas at the inlet end of the recoil housing is cut off, the air pressure in the pipe joint acts on the recoil valve, resetting the second spring, and the recoil valve and the recoil valve sleeve fit together, so that the air at the outlet end of the pipe joint will not flow back into the electromagnetic valve body, avoiding the impact of the backflow air on the electromagnetic valve body and improving the safety and reliability of the electromagnetic valve body. Description of the Drawings

[0014] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic diagram of the recoil structure of the present invention; Figure 3 is a schematic structural diagram of the solenoid valve body of the present invention; In the figure: 1, solenoid valve body; 2, recoil structure; 101, air inlet; 102, air outlet; 103, electromagnetic control valve; 104, slide valve; 105, bushing; 106, first spring; 107, expansion ring; 108, retaining pin; 109, air release port; 201, recoil housing; 202, pipe joint; 203, recoil valve; 204, recoil valve sleeve; 205, spring seat; 206, throttle nozzle; 207, second spring; 208, sealing ring; 209, washer. Specific embodiments

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments.

[0016] The technical solutions of the present invention will be described in detail below with specific embodiments. These several specific embodiments can be combined or replaced according to the actual situation. The same or similar concepts or processes may not be repeated in some embodiments. Embodiment

[0017] Such as Figures 1 to 3As shown in the figure, the present invention provides a solenoid valve switch with a recoil structure for purging fuel, which includes a solenoid valve body 1 and a recoil structure 2. The solenoid valve body 1 is provided with an air inlet 101 and an air outlet 102 on both sides, and a gas passage is formed inside, and an electromagnetic control valve 103 and a slide valve 104 are provided. The slide valve 104 is arranged in a bushing 105. An inner cavity of the valve body communicating with the gas passage is arranged inside the slide valve 104. The inner cavity of the valve body is supported by a first spring 106. A packing ring 107 is arranged between the outer wall of the slide valve 104 and the bushing 105. A through hole is opened at the lower part of the bushing 105, and a stop pin 108 for limiting the movement range of the slide valve 104 passes through the through hole. The solenoid valve body 1 is also provided with a vent port 109, and the electromagnetic control valve 103 is used to control the opening and closing of the vent port 109; the recoil structure 2 includes a recoil housing 201 and a pipe joint 202 connected by threads. The inlet end of the recoil housing 201 is connected to the air outlet 102 of the solenoid valve body 1. A recoil valve 203 and a recoil valve sleeve 204 are arranged inside the recoil housing 201. The recoil valve 203 is slidably connected to the recoil valve sleeve 204. A spring seat 205 and a throttle nozzle 206 are arranged inside the pipe joint 202. A through hole is opened at the center of the spring seat 205. Both ends of a second spring 207 abut against the spring seat 205 and the recoil valve 203. The throttle nozzle 206 is arranged at the outlet end of the pipe joint 202.

[0018] When high-pressure gas is introduced into the air inlet 101, power is supplied to the electromagnetic control valve 103, thereby opening the vent port 109. The high-pressure gas at the air inlet 101 pushes the slide valve 104 to move downward until the stop position, so that the air inlet 101 is communicated with the air outlet 102; to prevent the packing ring 107 from bursting and the bushing 105 from being deformed by the impact of the stop pin 108 when the slide valve 104 moves too fast under high pressure, by connecting the recoil structure 2 to the air outlet 102, the high-pressure gas enters the inlet end of the recoil housing 201 from the air outlet 102. The gas pressure acts on the recoil valve 203, forcing the recoil valve 203 to move to separate the recoil valve sleeve 204 and the recoil valve 203. The second spring 207 is compressed. The high-pressure gas enters the pipe joint 202 through the gap and flows out through the throttle nozzle 206; through the elastic compression of the second spring 207 and the damping effect of the throttle nozzle 206, the high-pressure gas is slowly depressurized, preventing the slide valve 104 from hitting the bushing 105 with too large an impact force when the vent port 102 is depressurized too quickly and deforming; and, when the high-pressure gas at the inlet end of the recoil housing 201 is cut off, the air pressure in the pipe joint 202 acts on the recoil valve 203, resetting the second spring 207, and the recoil valve 203 and the recoil valve sleeve 204 fit together, so that the air at the outlet end of the pipe joint 202 will not flow back into the solenoid valve body 1, avoiding the impact of the backflow air on the solenoid valve body 1 and improving the safety and reliability of the solenoid valve body 1.

[0019] Specifically, a sealing ring 208 is provided between the recoil valve 203 and the recoil valve sleeve 204. By providing the sealing ring 208, the sealing performance when the recoil valve 203 is in contact with the recoil valve sleeve 204 is ensured, preventing air from flowing back due to insufficient sealing performance.

[0020] Specifically, gaskets 209 are provided between the recoil valve sleeve 204 and the recoil housing 201, and between the recoil valve sleeve 204 and the pipe joint 202. By providing the gaskets 209, the tightness between the recoil valve sleeve 204 and the recoil housing 201 and the pipe joint 202 is ensured, preventing high-pressure gas coming out of the air outlet 102 from leaking through the gap and not acting or less acting on the recoil valve 203, reducing the compression of the second spring 207 and lowering the buffering effect on the spool valve 104.

[0021] Specifically, the throttle nozzle 206 is threadedly connected to the inner wall of the outlet end of the pipe joint 202. The throttle nozzle 206 is provided on the inner wall of the outlet end of the pipe joint 202 and has a central through hole with a diameter of 4.5 mm. The central through hole serves as a damping hole, enabling the recoil structure 2 to move more stably when the air pressure changes.

[0022] Specifically, the spool valve 104 is provided with protrusions at the upper and lower parts, the retaining pin 108 is arranged between the two protrusions, and the expansion ring 107 is sleeved on the protrusions of the spool valve 104. By providing protrusions on the spool valve 104 body as a limiting structure, the complexity of the overall structure of the spool valve is reduced, and the processing difficulty is lowered. The expansion ring 104 is sleeved at the protrusion to ensure the tightness between the spool valve 104 and the bushing 105.

[0023] Specifically, the air inlet 101 and the air outlet 102 are staggeredly arranged on both sides of the solenoid valve body 1. Through the staggered arrangement, it is possible to avoid a complex structure caused by the internal gas passage adapting to the movement of the spool valve 104. Now, only by moving the spool valve 104 up and down can the air inlet 101 and the air outlet 102 be opened and closed.

[0024] In addition to the above preferred embodiments, the present invention has other implementation manners. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection claimed by the present invention.

Claims

1. A solenoid valve switch with a recoil structure for purging fuel, characterized in that: The invention comprises a solenoid valve body (1) and a recoil structure (2), wherein the solenoid valve body (1) is provided with an air inlet (101) and an air outlet (102) on both sides, a gas channel is formed inside and an electromagnetic control valve (103) and a slide valve (104) are provided, wherein the slide valve (104) is arranged in a bushing (105), and a valve body inner cavity communicating with the gas channel is provided inside the slide valve (104), and the valve body inner cavity is supported by a first spring (106), and an expansion ring (107) is provided between the outer wall of the slide valve (104) and the bushing (105), and a through hole is provided at the lower part of the bushing (105), and a stop pin (108) for limiting the movable range of the slide valve (104) passes through the through hole, and the solenoid valve body (1) is also provided with an air release port (109), and the electromagnetic control valve (103) and the slide valve (104) are provided with a plurality of air outlets (109). 03) is used to control the opening and closing of the air release port (109); the recoil structure (2) comprises a recoil housing (201) and a pipe joint (202) connected by threaded connection, the inlet end of the recoil housing (201) is connected to the air outlet (102) of the solenoid valve body (1), a recoil valve (203) and a recoil valve sleeve (204) are arranged inside the recoil housing (201), the recoil valve (203) and the recoil valve sleeve (204) are slidably connected, a spring seat (205) and a throttle nozzle (206) are arranged inside the pipe joint (202), a through hole is provided in the center of the spring seat (205), two ends of the second spring (207) abut against the spring seat (205) and the recoil valve (203), and the throttle nozzle (206) is arranged at the outlet end of the pipe joint (202).

2. A solenoid valve switch with a recoil structure for purging fuel according to claim 1, characterized in that: A sealing ring (208) is provided between the recoil valve (203) and the recoil valve sleeve (204).

3. The solenoid valve switch with a recoil structure for purging fuel according to claim 1, characterized in that: Gaskets (209) are provided between the recoil valve sleeve (204) and the recoil housing (201), and between the recoil valve sleeve (204) and the pipe joint (202).

4. The solenoid valve switch with a recoil structure for purging fuel according to claim 1, characterized in that: The throttle nozzle (206) is threadedly connected to the inner wall of the outlet end of the pipe joint (202).

5. The solenoid valve switch with a recoil structure for purging fuel according to claim 1, characterized in that: The slide valve (104) is provided with protrusions at the top and bottom respectively, and the stop pin (108) is provided between the two protrusions.

6. A solenoid valve switch with a recoil structure for purging fuel according to claim 5, characterized in that: The expansion ring (107) is sleeved on the protrusion of the slide valve (104).

7. The solenoid valve switch with a recoil structure for purging fuel according to claim 1, characterized in that: The air inlet (101) and the air outlet (102) are arranged alternately on both sides of the solenoid valve body (1).

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