Piston type electromagnetic valve

Abstract

The utility model provides a piston type electromagnetic valve which comprises a valve body, the valve body is provided with a valve sleeve, a valve element used in cooperation with the valve sleeve and a reset spring located above the valve element, the bottom of the valve sleeve is communicated with a through flow channel at one end of the valve body, the bottom of the valve element is fixedly connected with a connecting shaft, the bottom of the connecting shaft is connected with a piston disc, and the piston disc is fixedly connected with the valve sleeve. A sinking groove matched with the piston disc in a sealing mode is formed in the inner circumferential wall of the through flow channel, and a breathing hole communicated with the sinking groove is formed in the outer circumferential wall of the valve body. According to the utility model, the sinking groove is formed in the through-flow channel, and the piston disc which is in sliding sealing fit with the sinking groove is connected to the top of the valve core through the connecting shaft, so that when pressure exists in the through-flow channel and the valve core is closed, the piston disc slides into the sinking groove, the sinking groove performs space compensation, and the closing resistance applied to the valve core by the through-flow channel is greatly reduced; and the closing control of the valve core is more sensitive and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic valves, in particular to a piston type electromagnetic valve. Background Art

[0002] When the current piston solenoid valve is powered on, the electromagnetic coil generates electromagnetic force to lift the piston upward from the valve seat. At this time, the spring in the piston chamber inside the valve body is compressed and deformed, and the valve in the valve seat is opened; when the power is off, the electromagnetic force disappears, and the spring in compression deformation will rebound the piston downward and seal the valve through the valve core. When some piston solenoid valves are closed, the pressure accumulated at the lower end of the valve is too high, which is greater than the downward rebound force of the spring, causing the piston valve core to move upward, thereby causing the valve to open, affecting the subsequent use effect.

[0003] The utility model with announcement number CN2184082U proposes a piston solenoid valve, including a gate seat and a pressure reducing mechanism; the gate seat: the air inlet arranged at the rear end is connected to the front end of the air inlet pipe, the exhaust port arranged at the upper end of the outer arc surface of the air inlet pipe is connected to the lower end of the exhaust pipe, the air outlet 1 arranged at the front end of the gate seat is connected to the rear end of the air outlet pipe, a connecting seat is arranged on the rear side of the bottom wall of the gate seat, the inlet at the rear end of the connecting seat is connected to the front end of the air inlet pipe, a valve sleeve is arranged on the upper end of the air outlet 2 opened on the upper side of the connecting seat, a piston valve core is slidably connected in the mounting port arranged at the upper end of the gate seat, the piston valve core is plugged into the valve sleeve, and a moving iron core is arranged on the upper end of the piston valve core. The piston solenoid valve can improve the sealing between the piston valve core and the valve, and when the internal pressure of the valve is too high, the internal pressure of the valve can be reduced in time, thereby preventing the valve from automatically opening due to excessive pressure when closed.

[0004] However, the above-mentioned prior art still has shortcomings when used: 1. The exhaust pipe provided in this valve will exhaust air outward when it is opened, and liquid will be discharged at the same time, which is easy to cause pollution. That is to say, every time the valve is closed, the exhaust pipe will discharge water outward; 2. The provided pressure reducing mechanism includes a sealing plate, a baffle, a sliding column, a pressure spring and an electromagnet, which makes the structure of the solenoid valve complicated, the cost investment is high, and the maintenance of the pressure reducing mechanism is inconvenient.

[0005] To this end, the utility model provides a piston type solenoid valve. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a piston solenoid valve to solve the problems raised in the above-mentioned background technology. The utility model has the advantages of small valve core sliding control resistance, making the opening and closing control of the solenoid valve more sensitive, and also has the advantages of simple structure and low cost.

[0007] In order to achieve the above-mentioned purpose, the utility model is implemented through the following technical scheme: a piston type solenoid valve, including a valve body, the valve body is provided with a valve sleeve, a valve core used in conjunction with the valve sleeve and a return spring located above the valve core, the bottom of the valve sleeve is connected to a flow channel at one end of the valve body, the bottom of the valve core is fixedly connected to a connecting shaft, the bottom of the connecting shaft is connected to a piston disk, the inner peripheral wall of the flow channel is provided with a sink groove which seals with the piston disk, and the outer peripheral wall of the valve body is provided with a breathing hole connected to the sink groove.

[0008] Furthermore, an annular groove is formed on the outer peripheral wall of the piston disc, and a rubber ring is sleeved in the annular groove and seals the recessed groove.

[0009] Furthermore, one end of the connecting shaft is fixedly connected to a guide shaft, and the guide shaft penetrates and is sleeved on the middle part of the piston disc, and the two are axially elastically slidably matched.

[0010] Furthermore, the guide shaft is fixedly sleeved with limit plates located on both sides of the piston disc, and the guide shaft is sleeved with a buffer spring located on both sides of the piston disc and with one end abutting against the limit plates.

[0011] Furthermore, a sealing sliding hole is provided in the middle of the piston disc and is sleeved on the outside of the guide shaft.

[0012] Furthermore, an inspection port connected to the sink is provided at the bottom of the valve body, a cover is screwed in the inspection port, the breathing hole is located on the cover, and a limit plate opposite to the cover is screwed and connected to the guide shaft.

[0013] Furthermore, the outer peripheral wall of the cover is fixedly connected with a handle.

[0014] The beneficial effects of the utility model are as follows:

[0015] The utility model arranges a sink groove in the flow channel, and then connects a piston disc that cooperates with the sink groove sliding seal at the top of the valve core through a connecting shaft. When there is pressure in the flow channel and the valve core is closed, the piston disc will slide into the sink groove, and the sink groove will perform spatial compensation. The closing resistance applied by the flow channel to the valve core is greatly reduced, making the closing control of the valve core more sensitive and reliable.

[0016] One end of the connecting shaft of the utility model is fixedly connected to a guide shaft which elastically slides with the piston disc axially. When the valve core is opened and closed, the piston disc will use its elastic sliding characteristics to buffer the impact force of the valve opening and closing, thereby reducing the opening and closing noise.

[0017] The utility model reduces the resistance of opening and closing the valve core by arranging a connecting column, a piston disc and a sink groove, has the advantages of simple structure and low cost, and a detachable cover is arranged on the outside of the valve body, which facilitates the maintenance of the piston disc after the cover is removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a piston type solenoid valve of the utility model;

[0019] Figure 2 for Figure 1 A schematic diagram of the enlarged part "a" in the figure;

[0020] Figure 3 for Figure 1 The main view;

[0021] In the figure: 1. valve body; 2. valve sleeve; 3. valve core; 4. return spring; 5. flow channel; 6. connecting shaft; 7. piston plate; 71. annular groove; 8. sink groove; 9. breathing hole; 101. rubber ring; 102. guide shaft; 1021. limit plate; 103. buffer spring; 104. inspection port; 105. cover; 1051. handle. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0023] See also Figures 1 to 3 The utility model provides a technical solution: a piston solenoid valve, including a valve body 1, the valve body 1 is provided with a valve sleeve 2, a valve core 3 used in conjunction with the valve sleeve 2 and a return spring 4 located above the valve core 3, the closing action of the valve core 3 is controlled by an electromagnetic coil arranged on the valve body 1, when the valve core enters the valve sleeve 2, the valve body 1 is closed, otherwise the valve body 1 is opened.

[0024] The bottom of the valve sleeve 2 is connected to the flow channel 5 at one end of the valve body 1. When the valve sleeve 2 is opened, liquid flows in the flow channel 5. The bottom of the valve core 3 is fixedly connected to a connecting shaft 6, and the bottom of the connecting shaft 6 is connected to a piston disc 7. The inner peripheral wall of the flow channel 5 is provided with a sink groove 8 that is sealed with the piston disc 7. Specifically, the outer peripheral wall of the piston disc 7 is provided with an annular groove 71, and a rubber ring 101 that is sealed with the sink groove 8 is sleeved in the annular groove 71. When the valve core 1 moves axially, the piston disc 7 moves axially in the sink groove 8. Therefore, when the valve core 3 moves axially, the space volume in the flow channel 5 is approximately unchanged. Therefore, when the valve body 3 is closed, the gas or liquid in the flow channel 5 will not exert a large resistance on the valve core 3, so that the valve core 3 can be reset under the push of the reset spring 4. The outer peripheral wall of the valve body 1 is provided with a breathing hole 9 that is connected with the sink groove 8.

[0025] In this embodiment, one end of the connecting shaft 6 is fixedly connected to a guide shaft 102, which penetrates and is sleeved on the middle part of the piston disc 7, and the two are axially elastically slidably matched, wherein the middle part of the piston disc 7 is provided with a sealing sliding hole sleeved on the outside of the guide shaft 102. Furthermore, the guide shaft 102 is fixedly sleeved with a limit plate 1021 located on both sides of the piston disc 7, and the guide shaft 102 is sleeved with a buffer spring 103 located on both sides of the piston disc 7 and one end of which is against the limit plate 1021. The action of the valve core 3 is electromagnetically controlled, and its action is rapid, and the piston disc 7 will be subjected to impact force. The buffer spring 103 provided plays a role in buffering the action of the piston disc 7, thereby extending the life of the piston disc 7.

[0026] In this embodiment, the bottom of the valve body 1 is provided with an inspection port 104 connected to the sink 8, a cover 105 is screwed in the inspection port 104, the breathing hole 9 is located on the cover 105, and the limit plate 1021 opposite to the cover 105 is screwed and connected to the guide shaft 102. Specifically, a screw with an outer diameter smaller than that of the guide shaft 102 can be welded to the free end of the guide shaft 102, and the limit plate 1021 corresponding to the screw can be screwed and connected. After the cover 105 is removed, the entire piston disc 7 can be removed when the limit plate 1021 that can be directly seen is removed, which is convenient for maintaining the piston disc 7. The outer peripheral wall of the cover 105 is fixedly connected with a handle 1051.

[0027] Working principle: When the electromagnetic coil on the valve body 1 is energized, the valve core 3 leaves the valve sleeve 2, the return spring 4 is compressed, the valve body 1 is opened, and the piston plate 7 slides a distance toward the mouth of the sink 8. When the electromagnetic coil is de-energized, the return spring 4 pushes the valve core 3 into the valve sleeve 2. At this time, the piston plate 7 slides away from the mouth of the sink 8 under the drive of the connecting shaft 6. At this time, due to the spatial compensation effect of the sink 8, the pressure change in the flow channel 5 is small, so it will not affect the normal closing function of the valve core 3.

[0028] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A piston type solenoid valve, comprising a valve body (1), the valve body (1) being provided with a valve sleeve (2), a valve core (3) used in conjunction with the valve sleeve (2), and a return spring (4) located above the valve core (3), the bottom of the valve sleeve (2) being connected to a flow passage (5) at one end of the valve body (1), characterized in that: The bottom of the valve core (3) is fixedly connected to a connecting shaft (6), the bottom of the connecting shaft (6) is connected to a piston disc (7), the inner peripheral wall of the flow passage (5) is provided with a recessed groove (8) which seals with the piston disc (7), and the outer peripheral wall of the valve body (1) is provided with a breathing hole (9) which communicates with the recessed groove (8).

2. A piston type solenoid valve according to claim 1, characterized in that: An annular groove (71) is formed on the outer peripheral wall of the piston disc (7), and a rubber ring (101) is sleeved in the annular groove (71) and is in sealing engagement with the sink groove (8).

3. A piston type solenoid valve according to claim 2, characterized in that: One end of the connecting shaft (6) is fixedly connected to a guide shaft (102), and the guide shaft (102) penetrates and is sleeved on the middle part of the piston disc (7), and the two are axially elastically slidably matched.

4. A piston type solenoid valve according to claim 3, characterized in that: The guide shaft (102) is fixedly sleeved with a limit plate (1021) located on both sides of the piston disc (7), and the guide shaft (102) is sleeved with a buffer spring (103) located on both sides of the piston disc (7) and with one end abutting against the limit plate (1021).

5. The piston type solenoid valve according to claim 3, characterized in that: A sealing sliding hole is provided in the middle of the piston disc (7) and is sleeved on the outside of the guide shaft (102).

6. A piston type solenoid valve according to claim 3, characterized in that: The bottom of the valve body (1) is provided with an inspection port (104) connected to the sink (8), a cover (105) is screwed into the inspection port (104), the breathing hole (9) is located on the cover (105), and a limit plate (1021) opposite to the cover (105) is screwed into the guide shaft (102).

7. A piston type solenoid valve according to claim 6, characterized in that: The outer peripheral wall of the cover (105) is fixedly connected to a handle bar (1051).

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