Piston stop type two-position three-way electromagnetic valve

Abstract

The utility model discloses a piston cut-off type two-position three-way electromagnetic valve which comprises a valve body, a coil assembly and a pilot seat, the pilot seat is arranged on the valve body, the coil assembly is arranged on the pilot seat, a valve cavity is arranged in the valve body, an air inlet, a working port and an air outlet are formed in the side wall of the valve body, and the air inlet is communicated with the working port. The inner ends of the air inlet, the working port and the exhaust port are communicated with the valve cavity, a driving assembly and a flow guide assembly are arranged in the valve cavity, the flow guide assembly comprises a flow guide part and a lower spacer bush, the driving assembly comprises a valve rod and an upper spacer bush, the lower spacer bush is connected to the peripheral side of the flow guide part in a sleeving mode, and the upper spacer bush is connected to the valve rod. The valve rod is inserted into the upper spacer bush in a sliding mode, one end of the flow guide piece abuts against one end of the upper spacer bush, and the valve rod corresponds to the flow guide piece. The valve body has the effect of reducing the production cost of the valve body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic valves, in particular to a piston stop type two-position three-way electromagnetic valve. BACKGROUND

[0002] The two-position three-way electromagnetic valve generally has an air inlet, a working port and an exhaust port, two of which are working positions. By changing the position of the valve core, the communication relationship of the three fluid conveying ports is changed to achieve different fluid control purposes. The existing electromagnetic valve has a valve cavity, two pistons, two chambers and two valve ports. The two pistons can respectively close or open the two valve ports, so as to communicate the air inlet with the working port or the exhaust port with the working port. For example, a two-position three-way electromagnetic valve disclosed in a Chinese utility model patent (application number CN202220408726.9) has two pistons and two valve ports. The two chambers change under the action of external force, thereby pushing the pistons to move and respectively close or open the two valve ports. The two pistons, two valve ports and two chambers are arranged in the same straight line, so that the valve body of the electromagnetic valve is relatively large, and the production cost of the electromagnetic valve is relatively high. SUMMARY

[0003] The purpose of the present application is to overcome the defects and deficiencies of the prior art and provide a piston stop type two-position three-way electromagnetic valve.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] The utility model discloses a valve body, coil assembly and pilot seat, the pilot seat sets up on the valve body, coil assembly sets up on the pilot seat, the valve cavity has in the valve body, the lateral wall of the valve body is equipped with air inlet, working port and exhaust port, the inner end of air inlet, working port and exhaust port is communicated with the valve cavity respectively, the valve cavity has drive assembly and flow guide component, the flow guide component includes flow guide piece and lower spacer sleeve, drive assembly includes valve rod and upper spacer sleeve, the lower spacer sleeve is sleeved on the circumferential side of flow guide piece, the valve rod is inserted and slips in upper spacer sleeve, one end of flow guide piece abuts one end of upper spacer sleeve, the valve rod and flow guide piece correspond to each other, when flow guide piece and upper spacer sleeve abut each other, air inlet is communicated with working port through lower spacer sleeve, flow guide piece and upper spacer sleeve, when valve rod pushes flow guide piece, makes flow guide piece and upper spacer sleeve separate from each other, exhaust port is communicated with working port through upper spacer sleeve.

[0006] Preferably, the flow guide comprises an upper spring seat, a lower spring seat and a first spring, the lower spring seat is fixedly inserted into the lower spacer, the upper spring seat is slidable in the lower spring seat, the upper spring seat has a flow channel therein, and the first spring drives the upper spring seat and the lower spring seat to move away from each other.

[0007] Preferably, the driving assembly further comprises a second spring, the second spring drives the valve rod and the upper spring seat to move away from each other.

[0008] Preferably, one end of the upper spacer has a first valve port, one end of the valve rod has a second valve port, and the first valve port and the second valve port are respectively in contact with one end of the upper spring seat.

[0009] Preferably, one end of the upper spring seat is provided with a sealing ring, and the outer side of the sealing ring is respectively in contact with the first valve port and the second valve port.

[0010] Preferably, the driving assembly further comprises an upper cover and a piston, one end of the upper cover is inserted into the opening of the valve cavity and fixes the upper spacer in the valve cavity, the piston is fixedly sleeved on the valve rod at an end away from the upper spring seat, one end of the pilot seat is provided with a sliding groove, and the piston is slidable in the sliding groove.

[0011] Preferably, the valve body has a first pilot channel, the pilot seat has a second pilot channel, one end of the first pilot channel and one end of the second pilot channel are in communication with each other, the second pilot channel has a third valve port, the coil assembly can close or open the third valve port, one end of the first pilot channel is in communication with the air inlet, and one end of the second pilot channel is in communication with the bottom of the sliding groove.

[0012] In summary, the beneficial technical effects of the present application are as follows:

[0013] When the coil assembly is not powered, the third valve port is in a closed state, the valve rod is not in contact with the upper spring seat, the second valve port of the valve rod and the upper spring seat are in an open state, the upper spring seat is placed under the action of the first spring, one end of the upper spring seat seals the first valve port of the upper spacer, and then the gas flowing into the inlet port flows out from the working port through the lower spacer, the upper spring seat and the upper spacer, and when the coil assembly is powered, the third valve port is in an open state, and then part of the gas flowing into the inlet port flows into the sliding groove through the first pilot channel and the second pilot channel, thereby pushing the piston, the second valve port at one end of the valve rod is in contact with the upper spring seat, the second valve port is in a closed state, the valve rod is continuously pushed downward, the first valve port of the upper spacer is separated from the upper spring seat, the first valve port is in an open state, and then the gas of the working port flows out from the exhaust port through the upper spacer and the first valve port, and compared with the prior art, the size of the valve body can be greatly reduced, and the production cost of the valve body is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a sectional view of the electromagnetic valve of the utility model.

[0015] In the figure: 1, valve body; 2, coil assembly; 3, pilot seat; 4, valve cavity; 5, inlet port; 6, working port; 7, exhaust port; 8, first pilot channel; 9, second pilot channel; 10, third valve port; 11, sliding groove; 12, drive assembly; 13, flow guide assembly; 14, flow guide piece; 15, lower spacer; 16, upper spring seat; 17, lower spring seat; 18, first spring; 19, first through hole; 20, flow guide channel; 21, upper spacer; 22, upper cover; 23, valve rod; 24, piston; 25, second spring; 26, second through hole; 27, first valve port; 28, second valve port; 29, sealing ring piece. DETAILED DESCRIPTION

[0016] The utility model will be further described below in combination with the drawings.

[0017] The embodiment of the application discloses a piston cut-off type two-position three-way electromagnetic valve.

[0018] Referring to Figure 1The valve body 1, the coil assembly 2 and the pilot seat 3 are included, the pilot seat 3 is fixed on one end of the valve body 1 by bolts, the coil assembly 2 is located at the outer end of the pilot seat 3, the valve body 1 has a valve cavity 4, one end of the valve cavity 4 thus one side of the valve body 1 penetrates out, the coil assembly 2 includes a shell, a coil, a static iron core and a moving iron core, the static iron core is fixed in the shell, the coil is located in the shell and is sleeved on the circumferential side of the static iron core, the moving iron core slides in the shell, the shell is fixed on the pilot seat 3, one side of the valve body 1 has an air inlet 5 and a working port 6, the air inlet 5 is located below the working port 6, the corresponding side of the valve body 1 has an exhaust port 7, the inner ends of the air inlet 5, the working port 6 and the exhaust port 7 are communicated with the valve cavity 4 respectively, a first pilot passage 8 is arranged in the valve body 1, a second pilot passage 9 is arranged in the pilot seat 3, one end of the first pilot passage 8 is communicated with the air inlet 5, the other end of the first pilot passage 8 corresponds to one end of the second pilot passage 9, the second pilot passage 9 has a third valve port 10, one end of the moving iron core corresponds to the third valve port 10 and can open or close the third valve port 10, the pilot seat 3 is arranged with a sliding groove 11 near one end of the valve body 1, the other end of the second pilot passage 9 is communicated with the sliding groove 11.

[0019] The valve cavity 4 has a driving assembly 12 and a flow guide assembly 13, part of the driving assembly 12 is located in the sliding groove 11, the other part of the driving assembly 12 is located in the upper part of the valve cavity 4, and the flow guide assembly 13 is located in the lower part of the valve cavity 4.

[0020] The flow guide assembly 13 includes a flow guide 14 and a lower spacer sleeve 15, the flow guide 14 includes an upper spring seat 16, a lower spring seat 17 and a first spring 18, the lower spacer sleeve 15 is inserted and fixed to the bottom of the valve cavity 4, the vertical cross section of the lower spacer sleeve 15 is in the shape of "N", four first through holes 19 are uniformly arranged on the inner side wall of the lower spacer sleeve 15, the first through holes 19 communicate the outer circumferential side of the lower spacer sleeve 15 with the inside of the lower spacer sleeve 15, one of the first through holes 19 corresponds to the air inlet 5, the lower end of the lower spring seat 17 is inserted and installed in the upper end of the lower spacer sleeve 15, the upper spring seat 16 is inserted and slides in the lower spring seat 17, a flow guide channel 20 is vertically arranged in the upper spring seat 16, the first spring 18 is sleeved on the outer circumferential side of the upper spring seat 16 and the lower spring seat 17, the upper end of the first spring 18 abuts against the side wall of the upper spring seat 16, and the lower end of the first spring 18 abuts against the side wall of the lower spring seat 17.

[0021] The driving assembly 12 comprises an upper spacer sleeve 21, an upper cover 22, a valve rod 23, a piston 24 and a second spring 25. The upper spacer sleeve 21 is fixedly inserted into the valve cavity 4. The upper and lower ends of the upper spacer sleeve 21 are provided with insertion holes. Four second through holes 26 are uniformly arranged on the inner side wall of the insertion hole. One of the second through holes 26 corresponds to the working port 6. One end of the upper cover 22 is fixedly inserted into the upper end of the valve cavity 4 and abuts against the side wall of the upper spacer sleeve 21. The valve rod 23 slides in the upper spacer sleeve 21 and the upper cover 22. The piston 24 is fixedly sleeved on the upper end of the valve rod 23 and slides in the sliding groove 11. The second spring 25 is located at the lower end of the valve rod 23. The upper end of the second spring 25 abuts against the lower end of the valve rod 23. The lower end of the second spring 25 abuts against the inner bottom of the lower spacer sleeve 15. The second spring 25 is located in the flow guide channel 20 of the upper spring seat 16.

[0022] The lower end of the upper spacer sleeve 21 is integrally provided with a first valve port 27. The lower end of the valve rod 23 is integrally provided with a second valve port 28. The upper end of the upper spring seat 16 is provided with a placement ring groove. A sealing ring 29 is fixedly installed in the placement ring groove. The outer side of the sealing ring 29 can abut against the first valve port 27 and the second valve port 28, respectively. When the upper spring seat 16 and the first valve port 27 or the second valve port 28 are in contact with each other, the sealing ring 29 can increase the sealing property between the upper spring seat 16 and the first valve port 27 or the second valve port 28.

[0023] The implementation principle of the piston 24 stop type two-position three-way electromagnetic valve disclosed in the embodiment of the application is as follows:

[0024] When the coil assembly 2 is not powered, the third valve port 10 is in a closed state. The valve rod 23 does not contact the upper spring seat 16. The second valve port 28 of the valve rod 23 is in an open state with the upper spring seat 16. The upper spring seat 16 is placed under the action of the first spring 18. One end of the upper spring seat 16 seals the first valve port 27 of the upper spacer sleeve 21. Then the gas flowing into the inlet port 5 flows out from the working port 6 through the lower spacer sleeve 15, the upper spring seat 16 and the upper spacer sleeve 21. When the coil assembly 2 is powered, the third valve port 10 is in an open state. Then part of the gas flowing into the inlet port 5 flows into the sliding groove 11 through the first pilot passage 8 and the second pilot passage 9, thereby pushing the piston 24. Then the second valve port 28 at one end of the valve rod 23 contacts the upper spring seat 16, so that the second valve port 28 is in a closed state. Then the valve rod 23 continuously pushes downward, so that the first valve port 27 of the upper spacer sleeve 21 is separated from the upper spring seat 16, and the first valve port 27 is in an open state. Then the gas of the working port 6 flows out from the exhaust port 7 through the upper spacer sleeve 21 and the first valve port 27.

[0025] The above merely describes preferred embodiments of the present application, and thus equivalent changes or modifications made in accordance with the structure, features and principles described in the patent application scope of the present application are included in the patent application scope of the present application.

Claims

1. A piston shut-off type two-position three-way electromagnetic valve, comprising a valve body (1), a coil assembly (2) and a pilot seat (3), the pilot seat (3) is arranged on the valve body (1), the coil assembly (2) is arranged on the pilot seat (3), the valve body (1) has a valve cavity (4) therein, the side wall of the valve body (1) is provided with an air inlet (5), a working port (6) and an exhaust port (7), the inner ends of the air inlet (5), the working port (6) and the exhaust port (7) are communicated with the valve cavity (4) respectively, characterized in that: The valve cavity (4) has a driving assembly (12) and a flow guide assembly (13) therein, the flow guide assembly (13) comprises a flow guide (14) and a lower spacer sleeve (15), the driving assembly (12) comprises a valve rod (23) and an upper spacer sleeve (21), the lower spacer sleeve (15) is sleeved on the peripheral side of the flow guide (14), the valve rod (23) is inserted and slides in the upper spacer sleeve (21), one end of the flow guide (14) abuts one end of the upper spacer sleeve (21), the valve rod (23) and the flow guide (14) correspond to each other, when the flow guide (14) and the upper spacer sleeve (21) abut each other, the air inlet (5) is communicated with the working port (6) through the lower spacer sleeve (15), the flow guide (14) and the upper spacer sleeve (21), when the valve rod (23) pushes the flow guide (14), the flow guide (14) and the upper spacer sleeve (21) are separated from each other, the air outlet (7) is communicated with the working port (6) through the upper spacer sleeve (21).

2. A piston shut-off two-position three-way solenoid valve according to claim 1, characterized in that The flow guide (14) comprises an upper spring seat (16), a lower spring seat (17) and a first spring (18), the lower spring seat (17) is inserted and fixed in the lower spacer sleeve (15), the upper spring seat (16) slides in the lower spring seat (17), the upper spring seat (16) has a flow guide channel (20) therein, and the first spring (18) drives the upper spring seat (16) and the lower spring seat (17) to move away from each other.

3. A piston-closure type two-position three-way electromagnetic valve according to claim 2, wherein The driving assembly (12) further comprises a second spring (25), the second spring (25) drives the valve rod (23) and the upper spring seat (16) to move away from each other.

4. The piston shut-off two-position three-way solenoid valve according to claim 2, characterized in that One end of the upper spacer sleeve (21) has a first valve port (27), one end of the valve rod (23) has a second valve port (28), and the first valve port (27) and the second valve port (28) are respectively in contact with one end of the upper spring seat (16).

5. A piston-closure type two-position three-way electromagnetic valve according to claim 4, wherein One end of the upper spring seat (16) is provided with a sealing ring (29), and the outer side of the sealing ring (29) is respectively in contact with the first valve port (27) and the second valve port (28).

6. A piston-closure type two-position three-way electromagnetic valve according to claim 2, wherein The driving assembly (12) further comprises an upper cover (22) and a piston (24), one end of the upper cover (22) is inserted into the opening of the valve cavity (4) and fixes the upper spacer sleeve (21) in the valve cavity (4), the piston (24) is fixedly sleeved on one end of the valve rod (23) away from the upper spring seat (16), one end of the pilot seat (3) is provided with a sliding groove (11), and the piston (24) slides in the sliding groove (11).

7. A piston-closure type two-position three-way electromagnetic valve according to claim 6, characterized in that The valve body (1) has a first pilot passage (8) therein, the pilot seat (3) has a second pilot passage (9) therein, one end of the first pilot passage (8) and one end of the second pilot passage (9) are communicated with each other, the second pilot passage (9) has a third valve port (10) therein, the coil assembly (2) can close or open the third valve port (10), one end of the first pilot passage (8) away from the pilot seat (3) is communicated with the air inlet (5), and one end of the second pilot passage (9) away from the valve body (1) is communicated with the bottom of the sliding groove (11).

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