Valve seat of pilot electromagnetic valve

Abstract

The utility model discloses a pilot electromagnetic valve seat which comprises a shell, a cover body, a bottom cover and a piston, the cover body is installed at the top of the shell, the bottom cover is installed at the bottom of the shell, the piston is installed in the shell, a first valve port can be communicated with a first valve cavity and a second valve cavity, a second valve port can be communicated with the first valve cavity or the second valve cavity, and a third valve port can be communicated with the first valve cavity. The valve cover comprises a third valve cavity, a fourth channel and a fifth channel, the fourth channel communicates with the first channel and the third valve cavity, the fifth channel communicates with the third valve cavity and the first valve cavity, the piston comprises a first check block and a second check block, the first check block is located in the first valve cavity, the second check block is located in the second valve cavity, and a spring is installed in the bottom cover to abut against the second check block. The valve seat is composed of the shell, the cover body and the bottom cover, so that the valve seat is more convenient to machine, and meanwhile, the internal structural design of the valve seat is tighter.

Description

Technical Field

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

[0002] Pilot solenoid valves are generally used to control the opening or closing of large-flow media. The opening and closing of large-flow media are controlled by a smaller valve-opening electromagnetic force. In the prior art, the pilot solenoid valve has a structure of a large piston and a small piston arranged in the valve chamber. The valve needle of the solenoid valve first cooperates with the small piston to achieve a smaller solenoid valve starting force, and then the main valve port is started by the large piston to open or close the valve. Generally, the large piston and the small piston of the pilot solenoid valve are both arranged in the valve seat, which results in a larger valve seat, a more complex internal structure of the valve seat, and a more difficult and costly processing and production. Therefore, a technical solution is needed to optimize the valve seat structure. Utility Model Content

[0003] In view of the above technical requirements, the utility model provides a valve seat for a pilot solenoid valve.

[0004] The utility model provides a pilot solenoid valve seat, comprising a shell, a cover, a bottom cover and a piston, wherein the cover is mounted on the top of the shell, the bottom cover is mounted on the bottom of the shell, and the piston is mounted inside the shell. The shell comprises a valve cavity 1, a valve cavity 2, a valve port 1, a valve port 2 and a valve port 3, wherein the valve port 1 can be connected to the valve cavity 1 and the valve cavity 2, the valve port 2 can be connected to the valve cavity 1 or the valve cavity 2, and the valve port 3 can be connected to the valve cavity 1. The cover comprises a valve cavity 3, a channel 4 and a channel 5, wherein the channel 4 is connected to the channel 1 and the valve cavity 3, and the channel 5 is connected to the valve cavity 3 and the valve cavity 1. The piston comprises a stopper 1 and a stopper 2, wherein the stopper 1 is located in the valve cavity 1, and the stopper 2 is located in the valve cavity 2. A spring is installed in the bottom cover to press the stopper 2, and the piston comprises a first state and a second state. In the first state, the stopper 2 blocks the valve port 2 and the valve cavity 2, thereby connecting the valve port 2 to the valve cavity 2 and the valve port 3. In the second state, the stopper 1 blocks the valve port 2 and the valve cavity 1, thereby connecting the valve port 1 to the valve port 2.

[0005] Furthermore, a through hole 1 is provided on the top surface of the shell, the valve port 1 is connected to the valve cavity 2 through the channel 1, the through hole 1 is connected to the channel 1, the through hole 1 is installed with a sealing ring 1, the cover body is provided with a through hole 3, the through hole 3 is connected to the channel 4 and the lower end surface of the cover body, the through hole 1 is connected to the through hole 3 and is aligned, and the sealing ring 1 seals the end surface of the connection between the through hole 1 and the through hole 3.

[0006] Furthermore, the valve cavity 1 is connected to the upper end surface of the shell, the valve cavity 1 is provided with a convex edge, the upper end surface of the convex edge is installed with a sealing ring 2, the sealing ring 2 seals the valve cavity 1, the valve cavity 3 is located above the valve cavity 1, and the channel 5 runs through the lower end surface of the cover body.

[0007] Furthermore, the block 1 is installed with a sealing ring 4, and the sealing ring 4 is located on the side wall of the block 1. The sealing ring 4 divides the valve cavity 1 into cavity 1 and cavity 2. The cavity 1 is connected to the valve cavity 3, and the cavity 2 can be connected to the valve port 2 and the valve port 3.

[0008] Furthermore, the valve port three is connected to the valve cavity one through the channel three, and the opening of the channel three connected to the valve cavity one is always within the range of the cavity two.

[0009] Furthermore, the valve port 2 is connected to the valve cavity 1 and the valve cavity 2 through the channel 2, the valve cavity 1 and the valve cavity 2 are distributed up and down, a part of the channel 2 is located between the valve cavity 1 and the valve cavity 2, the channel 2 is connected to the valve cavity 1 through the valve port 4, and the channel 2 is connected to the valve cavity 2 through the valve port 5, and the piston can switch to block the valve port 4 and the valve port 5 so that the channel 2 can switch to connect the valve cavity 1 and the valve cavity 2.

[0010] Furthermore, the second valve cavity is connected to the lower end surface of the shell, and the bottom cover is installed on the opening end of the second valve cavity through threads and is sealed by a third sealing ring.

[0011] Furthermore, the bottom cover comprises a guide groove, and a portion of the second stopper is always located in the guide groove.

[0012] Furthermore, the bottom cover is provided with a limiting groove, and a part of the spring is inserted into the limiting groove and fixed.

[0013] Furthermore, the cover body includes a through hole 2, which can connect the valve chamber 3 and the channel 4. The through hole 2 is located at the bottom center of the valve chamber 3. In the first state, the through hole 2 is in a closed state, so that the valve port 1 cannot be connected to the valve chamber 1. In the second state, the through hole 2 connects the valve chamber 3 and the channel 4, so that the medium of the valve port 1 can enter the valve chamber 1 and push the piston.

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

[0015] 1. The utility model arranges the valve seat into three parts: a shell, a cover body and a bottom cover. The piston can be installed inside the shell. The two stops of the piston are respectively located in the valve cavity 1 and the valve cavity 2 in the shell. The valve cavity 1 and the valve cavity 2 can be closed by the cover body and the bottom cover respectively. The valve seat processing is more convenient and the piston installation is more convenient.

[0016] 2. The valve chamber three of the utility model is located on the cover body, and the valve chamber three is located above the valve chamber one and is connected through the channel five. The valve chamber three is used to install the solenoid valve to control the opening and closing of the through hole two. The valve chamber one and the valve chamber two are distributed up and down, and a part of the channel two is located between the valve chamber one and the valve chamber two. The piston structure in the valve seat is optimized to make the internal structure of the valve seat tighter. 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 cross-sectional view of the piston in the first state in this embodiment.

[0020] Figure 4 It is a cross-sectional view of the piston in the second state in this embodiment.

[0021] Figure 5 It is a cross-sectional view in another direction of the piston in the first state in this embodiment.

[0022] Numbers in the figure: 1, shell; 11, valve port one; 111, channel one; 112, through hole one; 113, sealing ring one; 12, valve port two; 121, channel two; 122, valve port four; 123, valve port five; 13, valve port three; 131, channel three; 14, valve cavity one; 141, convex edge; 142, sealing ring two; 143, cavity one; 144, cavity two; 15, valve cavity two; 2, cover body; 21, valve cavity three; 22, channel four; 221, through hole two; 222, through hole three; 223, plug; 23, channel five; 3, bottom cover; 31, sealing ring three; 32, guide groove; 321, limit groove; 4, piston; 41, stopper one; 411, sealing ring four; 42, stopper two; 5, spring. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the accompanying drawings, in which typical embodiments of the present invention are shown.

[0024] like Figure 1 , Figure 2 , Figure 3As shown, this embodiment discloses a pilot solenoid valve seat, including a housing 1, a cover 2, a bottom cover 3 and a piston 4, the cover 2 is installed on the top of the housing 1, the bottom cover 3 is installed on the bottom of the housing 1, the piston 4 is installed inside the housing 1, the housing 1 includes a valve cavity 14, a valve cavity 2 15, a valve port 11, a valve port 2 12, and a valve port 3 13, the valve cavity 14 is connected to the upper end surface of the housing 1, the valve cavity 14 is provided with a convex edge 141, the upper end surface of the convex edge 141 is provided with a sealing ring 2 142, and the sealing ring 2 142 The valve cavity 14 is sealed, and the sealing ring 142 is deformed by the covering of the cover body 2 to seal the top edge of the valve cavity 14. The valve cavity 15 is connected to the lower end surface of the shell 1. The piston 4 includes a stopper 41 and a stopper 42. The stopper 41 is located in the valve cavity 14, and the stopper 42 is located in the valve cavity 15. The spring 5 is installed in the bottom cover 3 to press the stopper 42. The valve cavity 14 and the valve cavity 15 with upper and lower openings respectively can make the stopper 41 and the stopper 42 better installed inside the shell 1.

[0025] like Figure 3 , Figure 4 As shown, more preferably, the valve port 2 12 is connected to the valve cavity 14 and the valve cavity 2 15 through the channel 2 121, the valve cavity 14 and the valve cavity 2 15 are distributed up and down, a part of the channel 2 121 is located between the valve cavity 14 and the valve cavity 2 15, the channel 2 121 is connected to the valve cavity 14 through the valve port 4 122, and the channel 2 121 is connected to the valve cavity 2 15 through the valve port 5 123, and the piston 4 can switch to block the valve port 4 122 and the valve port 5 123 so that the channel 2 121 switches to connect the valve cavity 14 and the valve cavity 2 15, as shown in FIG. Figure 3 As shown in FIG. 1 , in the first state, the spring 5 presses the stopper 2 42 to block the valve port 5 123, blocking the channel 1 111 from connecting to the channel 2 121, thereby preventing the valve port 1 11 from connecting to the valve port 2 12. At this time, the valve port 2 12, the channel 2 121, the valve port 4 122, the valve cavity 1 14, and the valve port 3 13 form a passage, as shown in FIG. Figure 4 As shown in the figure, in the second state, the top of the stopper 41 is pushed by the air pressure to overcome the force of the spring 5 to push the piston 4 downward, so that the stopper 41 blocks the valve port 4 122 and further blocks the channel 2 121 and the valve cavity 14. At this time, the valve port 11, the channel 1 111, the valve cavity 2 15, the valve port 5 123, the channel 2 121, and the valve port 2 12 form a passage.

[0026] The valve port 1 11 and the valve port 2 12 are respectively located on two opposite sides of the shell 1, and the valve port 3 13 is located on the front of the shell 1. The valve port 1 11 can connect the valve cavity 1 14 and the valve cavity 2 15, the valve port 2 12 can connect the valve cavity 1 14 or the valve cavity 2 15, and the valve port 3 13 can connect the valve cavity 1 14. The cover body 2 includes a valve cavity 3 21, a channel 4 22 and a channel 5 23. The channel 4 22 connects the channel 1 111 and the valve cavity 3 21, and the channel 5 23 connects the valve cavity 3 21 and the valve cavity 1 14. The piston 4 includes a first state and a second state. In the first state, the block 42 blocks the valve port 12 and the valve cavity 15, and then the valve port 12 is connected to the valve cavity 15 and the valve port 3 13. In the second state, the block 41 blocks the valve port 12 and the valve cavity 14, and then the valve port 11 is connected to the valve port 12. A pilot valve is installed on the top of the cover body 2. The pilot valve can control the opening and closing of the passage from the valve port 11 to the valve cavity 14, and plays a role of pilot control. In the first state, the pilot valve blocks the medium of the valve port 11 from flowing to the valve cavity 14. In the second state, the pilot valve connects the valve port 11 to the valve cavity 14.

[0027] like Figure 3 As shown, the valve cavity three 21 is located above the valve cavity one 14, the channel five 23 is located on the bottom surface of the valve cavity three 21, the through hole one 112 is opened on the top surface of the shell 1, the valve port one 11 is connected to the valve cavity two 15 through the channel one 111, the through hole one 112 is connected to the channel one 111, the through hole one 112 is installed with a sealing ring one 113, the cover body 2 is provided with a through hole three 222, the through hole three 222 is connected to the channel four 22 and the lower end surface of the cover body 2, the through hole one 112 is connected and aligned with the through hole three 222, the sealing ring one 113 seals the end surface of the through hole one 112 and the through hole three 222 at the connection, the cover body 2 includes a through hole two 221, the through hole two 221 can connect the valve cavity three 21 and the channel four 22, the through hole two 221 is located in the valve cavity three 21, in the bottom center, in the first state, the through hole 221 is in a closed state, so that the valve port 11 cannot be connected to the valve cavity 14, in the second state, the through hole 221 connects the valve cavity 3 21 and the channel 4 22, so that the medium of the valve port 11 can enter the valve cavity 14 to push the piston 4, and the channel 4 22 is formed by the inward opening of the side wall of the cover body 2, and the open end of the channel 4 22 is closed by the plug 223. The channel 4 22 is a channel arranged in the horizontal direction, and the channel 4 22 is connected to the valve cavity 3 21 and the channel 1 111 through the through hole 221 and the through hole 3 222 respectively, to ensure the connection of the internal passage of the valve seat, and at the same time, the channel 4 22 and the through hole 221 and the through hole 3 222 are also very convenient to process.

[0028] like Figure 3 , Figure 5As shown, the stopper 41 is installed with a sealing ring 411, and the sealing ring 411 is located on the side wall of the stopper 41. The sealing ring 411 divides the valve cavity 14 into cavity 143 and cavity 2 144. Cavity 143 is connected to valve cavity 3 21, and cavity 2 144 can be connected to valve port 2 12 and valve port 3 13. When the medium enters cavity 143 from valve cavity 3 21 through channel 5 23, due to the action of the sealing ring 411, the pressure in cavity 143 gradually increases, pushing the stopper 41 downward, so that the space of cavity 143 gradually increases, and the space of cavity 2 144 gradually decreases.

[0029] More preferably, valve port three 13 is connected to valve cavity one 14 through channel three 131, and the opening of channel three 131 connected to valve cavity one 14 is always within the range of cavity two 144, preventing cavity one 143 from being connected to channel three 131, causing the medium in cavity one 143 to flow out of valve port three 13.

[0030] More preferably, the bottom cover 3 is installed on the open end of the valve chamber 15 by threads and is sealed by a sealing ring 31. A part of the bottom cover 3 is located in the valve chamber 15. The bottom cover 3 includes a guide groove 32. A part of the stopper 42 is always located in the guide groove 32. The guide groove 32 provides a guide for the stopper 42, so that the stopper 42 can be more stable when moving.

[0031] More preferably, the bottom cover 3 is provided with a limiting groove 321, and a part of the spring 5 is inserted into and fixed in the limiting groove 321. The limiting groove 321 is located at the center of the bottom cover 3. The spring 5 can be installed in the limiting groove 321 and the spring 5 and the stop block 42 are arranged concentrically, so that the spring 5 can press against the stop block 42 more stably.

[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 seat, characterized in that: The invention comprises a housing (1), a cover (2), a bottom cover (3) and a piston (4); the cover (2) is mounted on the top of the housing (1); the bottom cover (3) is mounted on the bottom of the housing (1); the piston (4) is mounted inside the housing (1); the housing (1) comprises a valve cavity 1 (14), a valve cavity 2 (15), a valve port 1 (11), a valve port 2 (12) and a valve port 3 (13); the valve port 1 (11) can be connected to the valve cavity 1 (14) and the valve cavity 2 (15); the valve port 2 (12) can be connected to the valve cavity 1 (14) or the valve cavity 2 (15); the valve port 3 (13) can be connected to the valve cavity 1 (14); the cover (2) comprises a valve cavity 3 (21), a channel 4 (22) and a channel 5 (23); the channel 4 (22) is connected to the channel 1 (1 11) and valve cavity three (21), the channel five (23) connects valve cavity three (21) and valve cavity one (14), the piston (4) includes a stopper one (41) and a stopper two (42), the stopper one (41) is located in valve cavity one (14), the stopper two (42) is located in valve cavity two (15), a spring (5) is installed in the bottom cover (3) to press the stopper two (42), the piston (4) includes a first state and a second state, in the first state, the stopper two (42) blocks valve port two (12) and valve cavity two (15), thereby connecting valve port two (12) to valve cavity two (15) and connecting valve port three (13), in the second state, the stopper one (41) blocks valve port two (12) and valve cavity one (14), thereby connecting valve port one (11) to valve port two (12).

2. The pilot solenoid valve seat according to claim 1, characterized in that: The shell (1) has a through hole (112) on its top surface, the valve port (11) is connected to the valve cavity (15) through the channel (111), the through hole (112) is connected to the channel (111), the through hole (112) is installed with a sealing ring (113), the cover (2) has a through hole (222), the through hole (222) is connected to the channel (22) and the lower end surface of the cover (2), the through hole (112) is connected to and aligned with the through hole (222), and the sealing ring (113) seals the end surface of the connection between the through hole (112) and the through hole (222).

3. The pilot solenoid valve seat according to claim 1, characterized in that: The valve chamber one (14) is connected to the upper end surface of the shell body (1), the valve chamber one (14) is provided with a convex edge (141), the upper end surface of the convex edge (141) is installed with a sealing ring two (142), the sealing ring two (142) seals the valve chamber one (14), the valve chamber three (21) is located above the valve chamber one (14), and the channel five (23) passes through the lower end surface of the cover body (2).

4. The pilot solenoid valve seat according to claim 1, characterized in that: The block one (41) is installed with a sealing ring four (411), and the sealing ring four (411) is located on the side wall of the block one (41). The sealing ring four (411) divides the valve cavity one (14) into cavity one (143) and cavity two (144). The cavity one (143) is connected to the valve cavity three (21), and the cavity two (144) can be connected to the valve port two (12) and the valve port three (13).

5. The pilot solenoid valve seat according to claim 4, characterized in that: The valve port three (13) is connected to the valve cavity one (14) through the channel three (131), and the opening of the channel three (131) connected to the valve cavity one (14) is always within the range of the cavity two (144).

6. The pilot solenoid valve seat according to claim 1, characterized in that: The valve port 2 (12) is connected to the valve cavity 1 (14) and the valve cavity 2 (15) through the channel 2 (121); the valve cavity 1 (14) and the valve cavity 2 (15) are distributed up and down; a part of the channel 2 (121) is located between the valve cavity 1 (14) and the valve cavity 2 (15); the channel 2 (121) is connected to the valve cavity 1 (14) through the valve port 4 (122); the channel 2 (121) is connected to the valve cavity 2 (15) through the valve port 5 (123); the piston (4) can switch to block the valve port 4 (122) and the valve port 5 (123) so as to switch the channel 2 (121) to connect the valve cavity 1 (14) and the valve cavity 2 (15).

7. The pilot solenoid valve seat according to claim 1, characterized in that: The second valve chamber (15) is connected to the lower end surface of the housing (1), and the bottom cover (3) is installed on the open end of the second valve chamber (15) through threads and is sealed by a third sealing ring (31).

8. The pilot solenoid valve seat according to claim 7, characterized in that: The bottom cover (3) comprises a guide groove (32), and a portion of the second stopper (42) is always located in the guide groove (32).

9. The pilot solenoid valve seat according to claim 1, characterized in that: The bottom cover (3) is provided with a limiting groove (321), and a part of the spring (5) is inserted into the limiting groove (321) and fixed.

10. The pilot solenoid valve seat according to claim 1, characterized in that: The cover body (2) comprises a second through hole (221), wherein the second through hole (221) can connect the valve cavity (21) and the channel (22), and the second through hole (221) is located at the bottom center of the valve cavity (21). In a first state, the second through hole (221) is in a closed state, so that the valve port (11) cannot connect to the valve cavity (14). In a second state, the second through hole (221) connects the valve cavity (21) and the channel (22), so that the medium of the valve port (11) can enter the valve cavity (14) to push the piston (4).

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