Pilot electromagnetic valve

Abstract

The pilot electromagnetic valve comprises a pilot valve and a valve seat, a third valve cavity is formed in the upper end of the valve seat, the pilot valve is installed on the valve seat, the pilot valve comprises a static iron core and a movable iron core, a part of the movable iron core is located in the third valve cavity, and the valve seat comprises a first valve port, a second valve port, a third valve port, a first valve cavity and a second valve cavity. The first valve port is communicated with the second valve cavity and the third valve cavity through a first channel, the second valve port is communicated with the first valve cavity and the second valve cavity through a second channel, the third valve port is communicated with the first valve cavity, the piston can switch the second valve port to be communicated with the first valve cavity and the second valve cavity, and the third valve cavity is communicated with the first valve cavity through a fourth channel. According to the electromagnetic valve, the medium flowing in the valve seat is controlled through the electromagnetic valve, the piston in the valve seat is driven to be switched and communicated through the pressure of the medium, and the larger the pressure of the medium is, the tighter the piston is plugged.

Description

Technical Field

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

[0002] As a type of valve that controls the flow of media in a pipeline, a solenoid valve has a valve core that opens and closes the flow path. Its main principle is to use the electromagnetic force generated when the coil is energized to control the up and down movement of the core iron, thereby controlling the flow of media in the pipeline system. Due to the limitation of the valve diameter, ordinary direct-acting solenoid valves can no longer meet the working environment of high air pressure and high flow rate. When the air pressure applied to the solenoid valve is too high, ordinary direct-acting solenoid valves are prone to leakage and cannot meet the valve control work of high-pressure pipelines. The safety and reliability of the solenoid valve in the use of high-pressure pipelines cannot be guaranteed. Therefore, a technical solution is needed to solve the above problems. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a pilot solenoid valve in view of the above technical requirements.

[0004] The utility model provides a pilot solenoid valve, comprising a pilot valve and a valve seat, wherein a valve cavity three is provided at the upper end of the valve seat, the pilot valve is fixedly installed on the valve seat, the pilot valve comprises a static iron core and a moving iron core, a part of the moving iron core is located in the valve cavity three, the valve seat comprises a valve port one, a valve port two, a valve port three, a valve cavity one, and a valve cavity two, the valve port one is connected to the valve cavity two and the valve cavity three through a channel one, the valve port two is connected to the valve cavity one and the valve cavity two through a channel two, the valve port three is connected to the valve cavity one, a piston is installed inside the valve seat, the piston can switch the valve port two to connect the valve cavity one and the valve cavity two, the valve cavity three is connected to the valve cavity one through a channel four, the pilot valve comprises a first state and a second state, in the first state, the moving iron core blocks the channel one and the valve cavity three, the piston blocks the channel two and the valve cavity two, and then the valve port two is connected to the valve port three, in the second state, the static iron core absorbs the moving iron core, and then the channel one is connected to the valve cavity three, the piston blocks the channel two and the valve cavity one, and then the valve port one is connected to the valve port two.

[0005] Furthermore, the piston includes stopper one and stopper two, stopper one is located in valve chamber one, stopper two is located in valve chamber two, a sealing ring is installed on one side wall of the stopper, the sealing ring presses against the inner wall of valve chamber one to separate valve chamber one into two parts, channel four connects valve chamber one and is located in the upper part of the sealing ring, channel two connects valve chamber one and is located in the lower part of the sealing ring, and in the second state, stopper one blocks channel two and valve chamber one.

[0006] Furthermore, a spring is installed in the second valve chamber, and the spring always presses against the second stopper. In the first state, the spring presses against the second stopper to block the second channel and the second valve chamber.

[0007] Furthermore, the valve seat includes a bottom cover, the bottom cover closes the bottom surface of the second valve cavity, the inner bottom surface of the bottom cover is provided with a slot, and a part of the spring is located in the slot.

[0008] Furthermore, the pilot valve includes valve port four, and in the first state, the valve chamber three is connected to the valve port four, and in the second state, the moving iron core blocks the valve chamber three and the valve port four.

[0009] Furthermore, the static iron core is provided with a channel five, and the side wall of the moving iron core is provided with a through groove, and the through groove connects the upper and lower end surfaces of the moving iron core. In the first state, the valve cavity three, the through groove, the channel five, and the valve port four are connected. In the second state, the moving iron core blocks the channel five and thus blocks the valve cavity three and the valve port four.

[0010] Furthermore, the channel one is connected to the center position of the inner bottom surface of the valve chamber three, and the moving iron core is concentrically arranged with the opening of the channel one connected to the valve chamber three.

[0011] Furthermore, the valve seat includes a valve cover, the valve cover is located on the upper part of the valve seat, the valve cavity three is located on the top of the valve cover, the channel four connects the valve cavity three and the lower end surface of the valve cover, and the valve cover is located at the top of the valve cavity one.

[0012] Further, the valve cover is provided with channel three, the channel three is connected to channel one and valve cavity three, the channel three includes channel six and channel seven, the channel six is ​​connected to valve cavity three, and the channel seven is connected to channel one.

[0013] Furthermore, the channel three is arranged transversely, the channel three is connected to the side wall of the valve cover, and a plug is installed at the open end of the channel three.

[0014] Compared with the related art, the pilot solenoid valve provided by the utility model has the following beneficial effects:

[0015] 1. The pilot valve of the utility model controls the moving iron core to block and connect the valve port 1 and the valve cavity 3 by energizing and de-energizing the coil. When the coil of the pilot valve is energized, the moving iron core is adsorbed by the static iron core, and the medium in the valve port 1 and the channel 1 flows into the valve cavity 3. The medium in the valve cavity 3 flows to the upper part of the sealing ring in the valve cavity 1 through the channel 4, so that the pressure in the upper part of the sealing ring space increases, and the piston is pushed downward to overcome the spring force. The block 1 blocks the valve port 2 and the valve port 3, and the valve port 1 is connected to the valve port 2. The greater the air pressure flowing into the valve port 1, the greater the pressure on the block 1, and it is not easy to leak, which is safer and more reliable.

[0016] 2. The pilot valve of the utility model is provided with a valve port four connected to the outside. When the coil of the pilot valve is powered off, the moving iron core blocks the channel six, the piston loses continuous pressure, and the spring pushes the piston upward to block the valve chamber two and the channel two. The gas in the upper part of the sealing ring in the valve chamber one can be discharged outward through the valve port four of the pilot valve, so that the residual gas after power failure will not hinder the movement of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of this embodiment.

[0018] Figure 2 This is an exploded view of this embodiment.

[0019] Figure 3 It is a top view of this embodiment.

[0020] Figure 4 for Figure 3 Cross-sectional view of the first state of the directional pilot valve in center A.

[0021] Figure 5 for Figure 3 Cross-sectional view of the directional pilot valve in the middle A in the second state.

[0022] Figure 6 for Figure 3 Cross-sectional view along the B direction.

[0023] Numbers in the figure: 1. Pilot valve; 11. Valve port four; 12. Static iron core; 121. Channel five; 13. Moving iron core; 131. Through groove; 2. Valve seat; 21. Valve port one; 211. Channel one; 212. Sealing ring one; 22. Valve port two; 221. Channel two; 23. Valve port three; 24. Valve cover; 241. Valve cavity three; 242. Channel three; 2421. Channel six; 2422. Channel seven; 243. Plug; 244. Channel four; 25. Bottom cover; 251. Slot; 26. Valve cavity one; 261. Sealing ring two; 27. Valve cavity two; 3. Piston; 31. Stopper one; 311. Sealing ring; 32. Stopper two; 4. Spring. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings show typical embodiments of the present invention.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, the present embodiment discloses a pilot solenoid valve, including a pilot valve 1 and a valve seat 2, a valve cavity 3 241 is provided at the upper end of the valve seat 2, the pilot valve 1 is fixedly mounted on the valve seat 2, the pilot valve 1 includes a static iron core 12 and a moving iron core 13, a part of the moving iron core 13 is located in the valve cavity 3 241, the valve seat 2 includes a valve port 1 21, a valve port 2 22, a valve port 3 23, a valve cavity 1 26, and a valve cavity 2 27, the valve port 1 21 is connected to the valve cavity 2 27 and the valve cavity 3 241 through a channel 1 211, the valve port 22 is connected to the valve cavity 1 26 and the valve cavity 2 27 through a channel 2 221, the valve port 3 23 is connected to the valve cavity 1 26, and the valve cavity 1 26 is located above the valve chamber 27, a part of the channel 2 221 is located between the valve chamber 1 26 and the valve chamber 2 27 and is connected to the valve chamber 1 26 and the valve chamber 2 27, the valve chamber 3 241 is located above the valve chamber 1 26, the valve chamber 3 241 is connected to the valve chamber 1 26 through the channel 4 244, the pilot valve 1 includes a first state and a second state, when the pilot valve 1 is in the first state, that is, the power-off state, the valve port 2 22 is connected to the valve port 3 23, and the valve seat 2 is in a closed state, when the pilot valve 1 is in the second state, that is, the power-on state, the valve port 2 22 is connected to the valve port 1 21, and the valve seat 2 is in an open state.

[0026] like Figure 5 , Figure 6 As shown, a piston 3 is installed inside the valve seat 2, and the piston 3 can switch the valve port 22 to connect the valve cavity 1 26 and the valve cavity 2 27. The piston 3 includes a stopper 31 and a stopper 32. The stopper 31 is located in the valve cavity 1 26, and the stopper 32 is located in the valve cavity 27. The stopper 31 and the stopper 32 can move simultaneously. A sealing ring 311 is installed on the side wall of the stopper 31, and the sealing ring 311 presses against the inner wall of the valve cavity 1 26 to separate the valve cavity 1 26 into two parts. The channel 4 244 connects the valve cavity 1 26 and is located in the upper part of the sealing ring 311. The channel 2 221 connects the valve cavity 1 26 and is located in the lower part of the sealing ring 311. When the coil of the pilot valve 1 is energized The moving iron core 13 is absorbed by the static iron core 12, and the medium in the valve port 21 and the channel 1 211 flows into the valve chamber 3 241. The medium in the valve chamber 3 241 flows to the upper part of the sealing ring 311 in the valve chamber 1 26 through the channel 4 244, thereby increasing the pressure in the upper part of the sealing ring 311, pushing the piston 3 downward to overcome the force of the spring 4, and the block 1 31 blocks the valve port 22 and the valve port 3 23. At this time, the valve port 1 21 is connected to the valve port 22. The greater the air pressure flowing into the valve port 1 21, the greater the pressure on the block 1 31. The block 1 31 blocks the channel 221 more tightly, is less likely to leak, and is safer and more reliable.

[0027] like Figure 4 , Figure 5As shown, a spring 4 is installed in the valve chamber 27, and the spring 4 always presses the stopper 32. In the first state, the spring 4 presses the stopper 32 to block the channel 221 and the valve chamber 27. After the pilot valve 1 is powered off, the spring 4 can press the piston 3 upward, and the stopper 32 can block the channel 221 to block the valve port 1 21 and the valve port 2 22.

[0028] like Figure 1 , Figure 2 , Figure 4 As shown, more preferably, the valve seat 2 includes a valve cover 24, the valve cover 24 is located at the upper part of the valve seat 2, the valve chamber three 241 is located at the top of the valve cover 24, the channel four 244 connects the valve chamber three 241 and the lower end surface of the valve cover 24, the valve cover 24 is respectively connected to the top of the valve chamber one 26, the valve seat 2 includes a bottom cover 25, the bottom cover 25 closes the bottom surface of the valve chamber two 27, the inner bottom surface of the bottom cover 25 is provided with a groove 251, a part of the spring 4 is located in the groove 251, the valve cover 24 and the bottom cover 25 in this embodiment can respectively close the valve chamber one 26 and the valve chamber two 27, the sealing ring two 261 is installed on the top of the valve chamber one 26 to press against the valve cover 24 for sealing, so that the stopper one 31 and the stopper two 32 of the piston 3 can be installed into the valve seat 2 from the top of the valve chamber one 26 and the bottom of the valve chamber two 27 respectively, so that the assembly installation is more convenient.

[0029] like Figure 1 , Figure 4 As shown, the valve cover 24 is provided with a channel three 242, which is arranged horizontally, and the channel three 242 is connected to the side wall of the valve cover 24. A plug 243 is installed at the open end of the channel three 242. The channel three 242 needs to be processed by drilling holes on the side wall of the valve cover 24. The opening of the channel three 242 connected to the outside is sealed by the plug 243 to prevent gas leakage in the channel three 242. The channel three 242 is connected to the channel one 211 and the valve cavity three 241. The channel three 242 includes a channel six 2421 and a channel seven 2422. The channel six 2421 is connected to valve chamber three 241, channel seven 2422 is connected to channel one 211, channel six 2421 and channel seven 2422 are channels perpendicular to channel three 242, channel six 2421 is connected to the center of the inner bottom surface of valve chamber three 241, the moving iron core 13 is concentrically arranged with the opening of valve chamber three 241 connected to channel one 211, and the moving iron core 13 can better press and block channel six 2421, channel seven 2422 is connected to channel one 211, and a sealing ring 1 212 is installed at the connection between channel seven 2422 and channel one 211 for sealing.

[0030] like Figure 4 , Figure 5 , Figure 6As shown, more preferably, the pilot valve 1 includes a valve port 4 11, the static iron core 12 is provided with a channel 5 121, and the side wall of the moving iron core 13 is provided with a through groove 131, and the through groove 131 is connected to the upper and lower end surfaces of the moving iron core 13. In the first state, the valve cavity 3 241, the through groove 131, the channel 5 121, and the valve port 4 11 are connected, and the valve cavity 3 241 is connected to the valve port 4 11. In the second state, the moving iron core 13 blocks the valve cavity 3 241 and the valve port 4 11, and the moving iron core 13 blocks the channel 5 121 and then The valve chamber three 241 and the valve port four 11 are blocked. The pilot valve 1 is provided with a valve port four 11 connected to the outside. When the coil of the pilot valve 1 is powered off, the moving iron core 13 blocks the channel six 2421, the piston 3 loses its continuous pressure, and the spring 4 pushes the piston 3 upward to block the valve chamber two 27 and the channel two 221. The gas in the upper part of the sealing ring 311 in the valve chamber one 26 can be discharged outward through the valve port four 11 of the pilot valve 1, so that the residual gas after power failure will not hinder the movement of the piston 3.

[0031] In this embodiment, the pilot valve 1 is in the first state when not powered on. The moving iron core 13 blocks the channel 1 211 and the valve cavity 3 241, so that the gas in the valve port 1 21, the channel 1 211 and the channel 3 242 cannot enter the valve cavity 3 241. The spring 4 presses the piston 3 to block the channel 2 221 and the valve cavity 2 27, so that the valve port 22 is connected to the valve port 3 23. In the second state, the pilot valve 1 is powered on and the static iron core 12 absorbs the moving iron core 13, and the moving iron core 13 moves upward, so that the channel 3 242 is connected with the valve cavity 3 241, so that the valve port 1 21 is connected to the valve cavity 3 241, and the gas in the valve port 1 21 is connected to the valve cavity 3 241. The gas first enters the valve chamber three 241 and flows through the channel four 244 to the upper part of the sealing ring 311 in the valve chamber one 26, increasing the gas pressure to push the piston 3 downward to overcome the pressure of the spring 4, so that the block one 31 blocks the channel two 221 and the valve chamber one 26, and the piston 3 blocks the channel two 221 and the valve chamber one 26, and then the valve port one 21 is connected to the valve port two 22. When the block two 32 moves downward at the same time, the channel two 221 is connected to the valve chamber two 27, and the channel one 211 is connected to the valve chamber two 27, so that the valve port one 21, the channel one 211, the valve chamber two 27, the channel two 221, and the valve port two 22 are connected.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pilot solenoid valve, characterized in that: The invention comprises a pilot valve (1) and a valve seat (2), wherein a valve cavity three (241) is provided at the upper end of the valve seat (2), wherein the pilot valve (1) is fixedly mounted on the valve seat (2), wherein the pilot valve (1) comprises a static iron core (12) and a moving iron core (13), wherein a portion of the moving iron core (13) is located in the valve cavity three (241), wherein the valve seat (2) comprises a valve port one (21), a valve port two (22), a valve port three (23), a valve cavity one (26), and a valve cavity two (27), wherein the valve port one (21) is connected to the valve cavity two (27) and the valve cavity three (241) through a channel one (211), wherein the valve port two (22) is connected to the valve cavity one (26) and the valve cavity two (27) through a channel two (221), wherein the valve port three (23) is connected to the valve cavity one (26), and wherein the valve seat (2) is internally mounted The piston (3) is capable of switching the valve port 2 (22) to connect the valve chamber 1 (26) and the valve chamber 2 (27); the valve chamber 3 (241) is connected to the valve chamber 1 (26) through the channel 4 (244); the pilot valve (1) comprises a first state and a second state; in the first state, the moving iron core (13) blocks the channel 1 (211) and the valve chamber 3 (241); the piston (3) blocks the channel 2 (221) and the valve chamber 2 (27), thereby connecting the valve port 2 (22) to the valve port 3 (23); in the second state, the stationary iron core (12) attracts the moving iron core (13) and thereby connects the channel 1 (211) to the valve chamber 3 (241); the piston (3) blocks the channel 2 (221) and the valve chamber 1 (26), thereby connecting the valve port 1 (21) to the valve port 2 (22).

2. A pilot solenoid valve according to claim 1, characterized in that: The piston (3) comprises a stopper one (31) and a stopper two (32), wherein the stopper one (31) is located in the valve cavity one (26), and the stopper two (32) is located in the valve cavity two (27). A sealing ring (311) is installed on the side wall of the stopper one (31), and the sealing ring (311) presses against the inner wall of the valve cavity one (26) to separate the valve cavity one (26) into two parts. The channel four (244) connects the valve cavity one (26) and is located in the upper part of the sealing ring (311), and the channel two (221) connects the valve cavity one (26) and is located in the lower part of the sealing ring (311). In the second state, the stopper one (31) blocks the channel two (221) and the valve cavity one (26).

3. A pilot solenoid valve according to claim 2, characterized in that: A spring (4) is installed in the second valve chamber (27), and the spring (4) always presses against the second stopper (32). In the first state, the spring (4) presses against the second stopper (32) to block the second channel (221) and the second valve chamber (27).

4. A pilot solenoid valve according to claim 3, characterized in that: The valve seat (2) comprises a bottom cover (25), the bottom cover (25) closes the bottom surface of the second valve cavity (27), the inner bottom surface of the bottom cover (25) is provided with a clamping groove (251), and a part of the spring (4) is located in the clamping groove (251).

5. The pilot solenoid valve according to claim 1, characterized in that: The pilot valve (1) comprises a valve port four (11); in a first state, the valve chamber three (241) is connected to the valve port four (11); in a second state, the moving iron core (13) blocks the valve chamber three (241) and the valve port four (11).

6. A pilot solenoid valve according to claim 5, characterized in that: The static iron core (12) is provided with a channel five (121), and the side wall of the moving iron core (13) is provided with a through groove (131), and the through groove (131) is connected to the upper and lower end surfaces of the moving iron core (13). In a first state, the valve cavity three (241), the through groove (131), the channel five (121), and the valve port four (11) are connected. In a second state, the moving iron core (13) blocks the channel five (121) and thereby blocks the valve cavity three (241) and the valve port four (11).

7. The pilot solenoid valve according to claim 1, characterized in that: The channel one (211) is connected to the center position of the inner bottom surface of the valve chamber three (241), and the moving iron core (13) is arranged concentrically with the opening of the channel one (211) connected to the valve chamber three (241).

8. The pilot solenoid valve according to claim 1, characterized in that: The valve seat (2) comprises a valve cover (24), the valve cover (24) is located at the upper part of the valve seat (2), the valve chamber three (241) is located at the top of the valve cover (24), the channel four (244) is connected to the valve chamber three (241) and the lower end surface of the valve cover (24), and the valve cover (24) is respectively connected to the top of the valve chamber one (26).

9. A pilot solenoid valve according to claim 8, characterized in that: The valve cover (24) is provided with a channel three (242), wherein the channel three (242) is connected to the channel one (211) and the valve cavity three (241), and the channel three (242) includes a channel six (2421) and a channel seven (2422), wherein the channel six (2421) is connected to the valve cavity three (241), and the channel seven (2422) is connected to the channel one (211).

10. A pilot solenoid valve according to claim 9, characterized in that: The channel three (242) is arranged transversely, the channel three (242) is connected to the side wall of the valve cover (24), and a plug (243) is installed at the open end of the channel three (242).

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