A pilot operated solenoid valve

Abstract

The utility model discloses a pilot type electromagnetic valve, wherein: moving core includes: upper core body and lower core body, and the lower part of upper core body is screwed into lower core body, and spring cavity is equipped in the upper core body, and the spring is installed in the spring cavity, and upper spring seat is equipped in the spring cavity, and lower spring seat is equipped in the lower core body, and the both ends of spring abut against two spring seats respectively, and the upper spring seat is equipped with guide column, and the guide column passes through upper core body and abuts against static core upwards, the sealing element on the bottom of main valve core is sealing ring, and the bottom end surface of main valve core is equipped with round recess, and the bottom of round recess is equipped with screw hole, and the pilot valve seat is further equipped, and pilot gas channel is equipped on the pilot valve seat, and the pilot valve seat is screwed into screw hole through the stud segment on it, and the bottom disc on the pilot valve seat is located in round recess, and the side wall of round recess is equipped with recess, and the outer ring of sealing ring is embedded into recess, and the inner ring of sealing ring is extruded by the outer ring of bottom disc, so that sealing ring can be detachably installed on main valve core. The pilot type electromagnetic valve has low maintenance cost and is easy to assemble.

Description

Technical Field

[0001] This utility model relates to the field of valves, specifically to a pilot-operated solenoid valve. Background Technology

[0002] Pilot-operated solenoid valves are a common type of normally closed solenoid valves. Existing pilot-operated solenoid valves have the following disadvantages: (1) In order to prevent the pilot seal from falling off during operation, the pilot seal is fixed to the bottom of the moving iron core in a non-removable manner. When the pilot seal is damaged and needs to be replaced, since the pilot seal cannot be removed from the moving iron core and the moving iron core is usually an integral structure, the entire moving iron core will be replaced along with the damaged pilot seal, which greatly increases the maintenance cost; (2) The pilot air passage is usually directly machined on the main valve core. When the moving iron core and the main valve core are installed together, the bottom of the moving iron core is prone to collide with the sealing surface where the pilot air passage outlet is located, which can easily cause the sealing surface to be damaged and unable to seal reliably. At this time, the main valve core needs to be replaced as a whole, which greatly increases the assembly difficulty. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a pilot-operated solenoid valve with low maintenance cost and easy assembly.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows: a pilot-operated solenoid valve, comprising: a valve body, on which a low-pressure port and a high-pressure port are provided; a valve cylinder and a coil are also installed on the valve body; the bottom of the valve cylinder is screwed into the valve body; a valve chamber is provided in the bottom of the valve cylinder; a main valve core that can move up and down is provided in the valve chamber; the main valve core divides the valve chamber into an upper chamber and a lower chamber; the high-pressure port is connected to the lower chamber; a main valve seat is provided on the valve body below the valve chamber; a valve port that allows the low-pressure port to connect to the lower chamber is provided on the main valve seat; after the main valve core moves downward, it can close the valve port through a sealing element installed at its bottom. The valve core has a pilot air passage that connects the low-pressure interface to the upper chamber. A stationary iron core is installed at the top of the valve cylinder, and a movable iron core that can move up and down is installed in the middle of the valve cylinder. A pilot sealing gasket is fixed at the bottom of the movable iron core. A spring is installed between the movable and stationary iron cores. When the movable iron core moves downward, the pilot sealing gasket can close the pilot air passage. Under the action of the spring, the movable iron core is pressed onto the main valve core, and the main valve core is pressed onto the main valve seat. A coil is looped around the outside of the stationary iron core. When the coil is energized, it generates a magnetic force that attracts the movable iron core, allowing the movable iron core to overcome the spring force and move upward. A lifting mechanism is provided between the movable iron core and the main valve core. The structure features a pull mechanism where the moving iron core moves upward to separate the pilot sealing gasket from the pilot air passage, allowing the main valve core to be lifted via a lifting mechanism. The moving iron core comprises an upper core and a lower core. The lower part of the upper core is screwed into the upper part of the lower core. A spring cavity is provided in the upper core, and a spring is installed within it. An upper spring seat, capable of sliding up and down along the spring cavity, is also provided in the spring cavity. A lower spring seat is provided in the lower core below the spring cavity. The two ends of the spring abut against the two spring seats respectively. A guide post is provided on the upper part of the upper spring seat, passing upward through the upper core and abutting against the stationary iron core. The main valve core has a bottom... The sealing element is a sealing ring that abuts against the sealing ring edge on the main valve seat to seal the valve port. A circular groove is provided on the bottom end face of the main valve core, and a threaded hole is provided at the bottom of the circular groove. A pilot valve seat is also provided, and a pilot air passage is provided on the pilot valve seat. The pilot valve seat is screwed into the threaded hole through the stud section on it and tightened from bottom to top onto the bottom of the main valve core. The bottom disc on the pilot valve seat is located in the circular groove, and an annular groove is provided on the side wall of the circular groove. The outer ring of the sealing ring is embedded in the groove, and the inner ring of the sealing ring is squeezed by the outer ring of the bottom disc, so that the sealing ring can be detachably installed on the bottom of the main valve core.

[0005] Furthermore, in the aforementioned pilot-operated solenoid valve, the pilot sealing gasket is vulcanized and bonded to the bottom blind hole of the lower core.

[0006] Furthermore, in the aforementioned pilot-operated solenoid valve, a wrench hole for turning with a wrench is machined on the bottom of the pilot valve seat.

[0007] Furthermore, in the aforementioned pilot-operated solenoid valve: a groove is provided at the top of the main valve core, and an annular protrusion is provided on the bottom side wall of the lower core. One side of the groove is cut off and left open, so that the annular protrusion can be inserted into the groove. There is a gap between the annular protrusion and the top of the groove, so that after the moving iron core moves upward and the pilot sealing gasket does not seal the pilot air passage, the annular protrusion can lift the main valve core by abutting against the top of the groove.

[0008] Furthermore, in the aforementioned pilot-operated solenoid valve, the main valve seat and valve body are machined as a single unit.

[0009] The advantages of this utility model are as follows: the moving iron core in the pilot-operated solenoid valve is a split structure, consisting of an upper core and a lower core. The pilot sealing gasket is fixed on the lower core. When the pilot sealing gasket is damaged and needs to be replaced, only the lower core needs to be replaced together, without replacing the entire moving iron core, thus greatly reducing maintenance costs. The pilot air passage is machined on the pilot valve seat, allowing the lower core and the main valve core to be installed first, and then screwed into the pilot valve seat. This makes the sealing surface at the pilot air passage outlet less prone to damage and easier to assemble. The sealing ring, as a vulnerable part, is removable, further reducing maintenance costs. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the pilot-operated solenoid valve.

[0011] Figure 2 This is a schematic diagram of the main valve core before the pilot valve seat is screwed in.

[0012] Figure 3 A schematic diagram of the structure after the pilot valve seat is screwed into the main valve core.

[0013] Figure 4 This is a schematic diagram showing the installation of the lower core and the main valve core. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0015] like Figure 1 , Figure 2 , Figure 3As shown, a pilot-operated solenoid valve includes: a valve body 1, a low-pressure port 2 and a high-pressure port 3 on the valve body 1, a valve cylinder 4 and a coil 5 mounted on the valve body 1, the bottom of the valve cylinder 4 being screwed into the valve body 1, a valve chamber being provided in the bottom of the valve cylinder 4, a main valve core 6 that can move up and down being provided in the valve chamber, the main valve core 6 dividing the valve chamber into an upper chamber 8 and a lower chamber 7, the high-pressure port 3 being connected to the lower chamber 7, a main valve seat 9 being provided on the valve body 1 below the valve chamber, the main valve seat 9 having a valve port that allows the low-pressure port 2 to connect to the lower chamber 7, the main valve core 6 being able to close the valve port by a sealing element installed at its bottom after moving downwards, a pilot air passage 11 being provided in the main valve core 6 that allows the low-pressure port 2 to connect to the upper chamber 8, and a valve cylinder... A stationary iron core 12 is installed at the top of valve cylinder 4, and a movable iron core 13 that can move up and down is installed in the middle of valve cylinder 4. A pilot sealing gasket 14 is fixed at the bottom of the movable iron core 13. A spring 15 is provided between the movable iron core 13 and the stationary iron core 12. After the movable iron core 13 moves downward, the pilot sealing gasket 14 can seal the pilot air passage 11. Under the action of the spring 15, the movable iron core 13 is pressed onto the main valve core 6, and the main valve core 6 is pressed onto the main valve seat 9. The coil 5 is looped around the outside of the stationary iron core 12. After the coil 5 is energized, it can generate a magnetic force to attract the movable iron core 13, so that the movable iron core 13 can overcome the elastic force of the spring 15 and move upward. A lifting structure is provided between the movable iron core 13 and the main valve core 6. The upward movement of the movable iron core 13 causes the pilot seal to... After the pad 14 leaves the pilot air passage 11, the main valve core 6 can be lifted by the lifting structure. The structure of the moving iron core 13 includes: an upper core body 16 and a lower core body 17. The lower part of the upper core body 16 is screwed into the upper part of the lower core body 17. A spring cavity 18 is provided in the upper core body 16, and a spring 15 is installed in the spring cavity 18. An upper spring seat 19 that can slide up and down along the spring cavity 18 is also provided in the spring cavity 18. A lower spring seat 20 is provided in the lower core body 17 below the spring cavity 18. The two ends of the spring 15 abut against the two spring seats respectively. A guide post 21 is provided on the upper part of the upper spring seat 19. The guide post 21 passes upward through the upper core body 16 and abuts against the stationary iron core 12. The seal on the bottom of the main valve core 6 is capable of... The sealing ring 10 on the main valve seat 9 abuts against the valve port to seal the valve port. A circular groove 22 is provided on the bottom end face of the main valve core 6. A threaded hole 23 is provided at the bottom of the circular groove 22. A pilot valve seat 24 is also provided. The pilot air passage 11 is provided on the pilot valve seat 24. The pilot valve seat 24 is screwed into the threaded hole 23 through the stud section on it and tightened from bottom to top on the bottom of the main valve core 6. The bottom disc on the pilot valve seat 24 is located in the circular groove 22. An annular groove 25 is provided on the side wall of the circular groove 22. The outer ring of the sealing ring 10 is embedded in the groove 25. The inner ring of the sealing ring 10 is squeezed by the outer ring of the bottom disc, so that the sealing ring 10 can be detachably installed on the bottom of the main valve core 6.

[0016] The pilot gasket 14 is vulcanized and bonded to the bottom blind hole of the lower core 17. A wrench hole 26 for turning is machined on the bottom of the pilot valve seat 24. The main valve seat 9 can be integrally machined with the valve body 1, thereby reducing the number of parts and simplifying assembly.

[0017] like Figure 4 As shown, the lifting structure is as follows: a groove 27 is provided on the top of the main valve core 6, and an annular protrusion 28 is provided on the bottom side wall of the lower core 17. One side of the groove 27 is cut off and left open, allowing the annular protrusion 28 to engage with the groove 27. There is a gap between the top of the annular protrusion 28 and the groove 27, allowing the moving iron core 13 to move upward so that the pilot sealing gasket 14 does not seal the pilot air passage 11. Only then can the annular protrusion 28 abut against the top of the groove 27 to lift the main valve core 6. The top of the main valve core 6 is cut off in half, leaving one side of the groove 27 open. This design optimizes the assembly method and structure of the moving iron core and the main valve core, making assembly easier and greatly improving reliability.

[0018] Typically, the low-pressure port 2 of a pilot-operated solenoid valve is connected to a low-pressure pipeline, and the high-pressure port 3 is connected to a high-pressure pipeline. When the pilot-operated solenoid valve needs to be opened, the coil is energized and generates a magnetic force that attracts the moving iron core 13, causing the moving iron core 13 to overcome the spring force and move upward. This prevents the pilot sealing gasket 14 from sealing the pilot air passage 11. At this time, the low-pressure port 2 can be connected to the upper chamber 8, allowing the air pressure in the upper chamber 8 to drop rapidly. This creates a pressure difference between the lower chamber 7 and the upper chamber 8. Under the pressure difference and the lifting action of the moving iron core 13, the main valve core 6 can be driven to move upward, allowing the low-pressure port 2 and the high-pressure port 3 to be connected through the lower chamber 8, thereby enabling the supply of air from the high-pressure end to the low-pressure end.

Claims

1. A pilot-operated solenoid valve, comprising: The valve body has low-pressure and high-pressure ports. A valve cylinder and coil are also mounted on the valve body. The bottom of the valve cylinder screws into the valve body, and a valve chamber is located at the bottom of the valve cylinder. A main valve core, capable of vertical movement, is located within the valve chamber, dividing the valve chamber into an upper and lower chamber. The high-pressure port is connected to the lower chamber. A main valve seat is located on the valve body below the valve chamber, and a valve port connecting the low-pressure port to the lower chamber is located on the main valve seat. When the main valve core moves downward, it can close the valve port through a seal at its bottom. A pilot air passage connecting the low-pressure port to the upper chamber is located within the main valve core. A stationary iron core is installed at the top of the valve cylinder, and a movable iron core that can move up and down is installed in the middle of the valve cylinder. A pilot sealing gasket is fixed at the bottom of the movable iron core. A spring is installed between the movable and stationary iron cores. When the movable iron core moves downward, the pilot sealing gasket can close the pilot air passage. Under the action of the spring, the movable iron core is pressed onto the main valve core, and the main valve core is pressed onto the main valve seat. A coil is looped around the outside of the stationary iron core. When the coil is energized, it can generate a magnetic force to attract the movable iron core, allowing the movable iron core to overcome the spring force and move upward. A lifting structure is provided between the movable iron core and the main valve core. The upward movement of the movable iron core causes the pilot sealing gasket to move away from the main valve seat. After the pilot air passage is opened, the main valve core can be lifted by a lifting structure. The moving iron core structure includes an upper core body and a lower core body. The lower part of the upper core body is screwed into the upper part of the lower core body. A spring cavity is provided in the upper core body, and a spring is installed in the spring cavity. An upper spring seat that can slide up and down along the spring cavity is also provided in the spring cavity. A lower spring seat is provided in the lower core body below the spring cavity. The two ends of the spring abut against the two spring seats respectively. A guide post is provided on the upper part of the upper spring seat, and the guide post passes upward through the upper core body and abuts against the stationary iron core. The sealing element at the bottom of the main valve core can abut against the main valve seat. The sealing ring abuts against the valve port to seal the valve. The bottom surface of the main valve core has a circular groove, and a threaded hole is provided at the bottom of the circular groove. A pilot valve seat is also provided, and a pilot air passage is provided on the pilot valve seat. The pilot valve seat is screwed into the threaded hole through the stud section on it and tightened from bottom to top onto the bottom of the main valve core. The bottom disc on the pilot valve seat is located in the circular groove, and an annular groove is provided on the side wall of the circular groove. The outer ring of the sealing ring is embedded in the groove, and the inner ring of the sealing ring is squeezed by the outer ring of the bottom disc, so that the sealing ring can be detachably installed on the bottom of the main valve core.

2. The pilot-operated solenoid valve according to claim 1, characterized in that: The pilot gasket is vulcanized and bonded to the bottom blind hole of the lower core.

3. A pilot-operated solenoid valve according to claim 1 or 2, characterized in that: The bottom of the pilot valve seat is machined with a wrench hole for turning with a wrench.

4. A pilot-operated solenoid valve according to claim 1 or 2, characterized in that: The lifting structure is as follows: a groove is provided on the top of the main valve core, and an annular protrusion is provided on the bottom side wall of the lower core. One side of the groove is cut off and left open, so that the annular protrusion can be inserted into the groove. There is a gap between the annular protrusion and the top of the groove, so that the moving iron core moves upward and the pilot sealing gasket does not seal the pilot air passage. Only then can the annular protrusion lift the main valve core by abutting against the top of the groove.

5. A pilot-operated solenoid valve according to claim 1 or 2, characterized in that: The main valve seat and valve body are machined as a single unit.

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