A pilot valve assembly

Abstract

A pilot valve assembly includes a sleeve structure, a static iron core, a moving iron core, a push rod and a fixing device. The sleeve structure is a hollow rectangular metal structure or a hollow oblong metal structure with two ends through. The sleeve structure is arranged in the through inner hole of the coil skeleton, and the outer annular surface is in contact with the inner wall of the coil skeleton; the tail end of the static iron core is inserted into the left side of the through inner hole of the sleeve structure, the front end of the static iron core is convexly provided with a first guide head, and the static iron core is axially provided with a through hole for the push rod to pass through. The moving iron core is arranged in the through inner hole of the sleeve structure and is located on the right side of the static iron core. The left end of the moving iron core is against the right end of the push rod, and the right end of the moving iron core is connected to the fixing device. At least one side of the left end of the moving iron core and the right end of the static iron core is a rough surface. The invention has a simple and reasonable structure, is easy to assemble and process, can save energy by 20-70%, and the wire diameter becomes smaller under the same power, which greatly reduces the cost.

Description

Technical Field

[0001] The invention relates to a solenoid valve, in particular to a pilot valve assembly. Background Art

[0002] The solenoid valve is an industrial device controlled by electromagnetics. It is an automatic basic component used to control fluids. It belongs to an actuator and is not limited to hydraulic and pneumatic. It is used in industrial control systems to adjust the direction, flow, speed and other parameters of the medium. The coil frame inside is an indispensable component of each electromagnetic relay. The existing solenoid valve includes a main valve body part and a control part. The control part includes a coil assembly, a wiring seat, a junction box and a pilot valve push rod passing through the shell. The wiring seat is set on the shell, and the junction box is set outside the wiring seat. There are electrical components connected to the plug. The external wiring passes through the junction box and is connected to the electrical component. When the solenoid valve is energized, the coil in the shell has current, and an electromagnetic field is generated in the shell. The electromagnetic field acts on the push rod of the pilot valve, and the push rod of the pilot valve moves, realizing the use of the pilot valve to drive the main valve body of the solenoid valve to move. However, since the coil frame around which the enameled wire is wound is cylindrical in shape but its shell is rectangular, the space occupied by the coil frame in the rectangular chamber is small. In order to achieve the required magnetic flux, thicker enameled wire must be wound around the coil frame, so the cost is relatively high.

[0003] In addition, the end surfaces of the moving iron core and the static iron core in contact are both smooth. During the use of the liquid solenoid valve, the accumulation of water will cause the moving iron core to be sucked and difficult to return to its original position. Therefore, it is necessary to design a pilot valve assembly to meet the needs of users. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a pilot valve assembly with a simple and reasonable structure and low cost in view of the above technical status.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a pilot valve assembly, the pilot valve includes a shell, a coil skeleton for winding a coil is arranged in the shell, and the coil skeleton has a through inner hole for the pilot head assembly to penetrate, and is characterized in that: the pilot valve assembly includes a sleeve structure, a static iron core, a movable iron core, a push rod and a fixing device, wherein the sleeve structure is a hollow rectangular metal structure or a hollow oblong metal structure with two ends through, and the cross section and longitudinal section of the inner ring surface and the outer ring surface are both rectangular, or the cross section of the inner ring surface and the outer ring surface are oblong and the longitudinal section is rectangular, the sleeve structure is arranged in the through inner hole of the coil skeleton, and the outer ring surface matches the inner wall of the coil skeleton;

[0006] The tail end of the static iron core is inserted and fixed on the left side of the through inner hole of the sleeve structure, the front end of the static iron core is convexly provided with a first guide head extending out of the shell, and a through hole for the push rod to pass through is axially opened in the static iron core, and the push rod is slidably arranged in the through hole;

[0007] The moving iron core is arranged in the through inner hole of the sleeve structure and is located on the right side of the static iron core. The left end of the moving iron core abuts against the right end of the push rod, and the right end of the moving iron core is connected to the fixing device.

[0008] At least one of the left end surface of the moving iron core and the right end surface of the stationary iron core is a rough surface.

[0009] As an improvement, the static iron core is a rectangular structure or an oblong structure that matches the inner cavity of the coil skeleton, and the tail end of the static iron core is a reduced diameter structure that matches the through inner hole of the sleeve structure. The static iron core is fixedly arranged in the coil skeleton, and the front end face of the static iron core is flush with the left side of the shell. The front end face of the static iron core is convexly provided with a reduced diameter cylindrical structure serving as a first guide head, and a first annular groove coaxial with the through hole is concavely provided in the middle part of the front end face of the static iron core. A second annular groove is provided in the first guide head, and the inner diameter of the second annular groove is larger than that of the first annular groove. The push rod is a triangular prism structure with a triangular cross-section. The push rod is inserted into the through hole, and the right end of the push rod is against the inner end of the moving iron core, and the left end of the push rod extends into the second annular groove to interact with the valve core through a spring.

[0010] Furthermore, the moving iron core is a rectangular structure or an oblong structure that cooperates with the through inner hole of the sleeve structure. The pilot valve assembly also includes a push rod. The fixing device includes a fixed block and a fixed shell. The fixed block is arranged on the outside of the right end of the moving iron core and is fixed to the right end of the shell through the fixed shell. The push rod passes through the fixed block and abuts against the right end of the moving iron core. When stuck or power is off, the moving iron core is driven to move to the left by the push rod.

[0011] Furthermore, the fixed block is divided into three sections from left to right, wherein the first section is a reduced diameter section that abuts against the right end of the moving iron core, the second section is a rectangular section or an oblong section that cooperates with the through inner cavity of the sleeve structure, the third section is a reduced diameter second guide head, and the intersection of the second section and the third section is provided with an annular convex edge that abuts against the right end of the sleeve structure and limits the position, the outer peripheral surface of the right end of the sleeve structure is provided with an external thread, the fixed shell is a circular sleeve shell structure with an opening at the left end, a through hole for the second guide head to pass through is provided in the middle of the fixed shell, the fixed shell is sleeved on the right end of the sleeve structure and is threadedly connected and fixed to the sleeve structure, or, the outer periphery of the second guide head is provided with an external thread, the through hole of the fixed shell is a corresponding internal threaded hole, and the fixed shell is threadedly connected and fixed to the second guide head of the fixed block.

[0012] Furthermore, a mounting hole for inserting a push rod is axially opened in the middle of the fixed block, and a groove coaxial with the mounting hole is provided in the middle of the right end face of the moving iron core, and the diameter of the groove is larger than the aperture of the mounting hole. The push rod is divided into two left and right sections, of which the left section is an expanded diameter section, and the left section of the push rod is arranged in the groove, and its left and right sides are respectively restrained against the right end of the moving iron core and the left end of the fixed block, and the right section of the push rod is inserted into the mounting hole, and the right end face of the push rod is concavely provided with an arc surface for facilitating manual pressing.

[0013] As a further improvement, the sleeve structure is divided into two sections, the tail end of the static iron core is inserted into the left side of the left section of the sleeve structure, and the right side of the left section of the sleeve structure is fixedly connected to the right section of the sleeve structure.

[0014] Further improvement, the shell is a hollow metal frame structure, and the left and right ends of the shell are respectively provided with openings for the first pilot head of the static iron core and the right end of the sleeve structure to extend out. A circuit board is arranged inside the shell and above the coil skeleton, and a pin seat is arranged at the upper end of the circuit board. An opening is arranged at the upper end of the shell for the pin seat to extend out, and the pins extend out of the shell and are fixed on the pin seat. A conductive spring is provided at the bottom of the pin to abut against the circuit board to achieve electrical connection.

[0015] Further, the pin is in the shape of a straight sheet, the socket on the pin seat is a corresponding straight hole, and the pin is located on the upper surface of the shell after being fixed, or the pin is in the shape of a right-angle bend, the socket of the pin seat is a corresponding right-angle bend hole, and the pin is located on the front side of the upper surface of the shell after being fixed.

[0016] Furthermore, the rough surface is provided as a knurled surface or a convex cylindrical surface or a turned surface.

[0017] Finally, the pilot valve assembly further comprises a wire coil bottom plate, which is fixed on the left end surface of the shell, and the first guide head passes through the wire coil bottom plate and is exposed outside the wire coil bottom plate.

[0018] Compared with the prior art, the advantages of the present invention are: the sleeve structure is improved from the traditional circular shape to a rectangular or oblong shape, which increases the electromagnetic force. When the coil length remains unchanged, the electromagnetic suction force of the same number of coils is greater; no rectifier ring is required, the structure is simpler, and the structure of the pilot valve assembly plus the rectifier element can be used for both DC and AC; at least one side of the moving iron core and the static iron core is a rough surface to prevent the two from being attracted; the top rod is designed as a triangular prism structure, and the gap between the top rod and the through hole of the static iron core is increased to facilitate the express passage of liquid or gas; a hand push rod is added to play the role of a manual valve, which can be used for emergency use when stuck or power off; a fixed shell is set to make the coil more firmly fixed. The present invention has a simple and reasonable structure, is easy to assemble and process, can save energy by 20-70%, and has a smaller wire diameter at the same power, greatly reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a schematic structural diagram of a pilot valve assembly according to Embodiment 1 of the present invention;

[0020] Figure 2 for Figure 1 Left view of

[0021] Figure 3 This is a schematic structural diagram of a pilot valve assembly according to Embodiment 2 of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the pilot valve of embodiments 1 and 3 of the present invention;

[0023] Figure 5 It is a side view of the pilot valve housing and coil skeleton of Example 3;

[0024] Figure 6 It is a side view of the pilot valve housing and coil skeleton of Example 4;

[0025] Figure 7 This is a schematic structural diagram of a pilot valve according to Embodiment 5 of the present invention;

[0026] Figure 8 It is a side view of the pilot valve housing and coil skeleton of Example 5;

[0027] Fig. 9 It is a side view of the pilot valve housing and coil skeleton of Example 6;

[0028] Fig.10 Schematic diagram of the structure of the pilot valve of Example 7 of the present invention;

[0029] Fig.11 This is a schematic structural diagram of a pilot valve according to Embodiment 8 of the present invention; DETAILED DESCRIPTION

[0030] The present invention is further described in detail below with reference to the accompanying drawings.

[0031] Example 1

[0032] like Figure 1 , 2As shown in Figure 4, a pilot valve assembly, the pilot valve includes a shell 10, a coil skeleton 20 for winding a coil is arranged in the shell 10, the coil skeleton 20 has a through inner hole 201 for the pilot head assembly to pass through, and also includes a sleeve structure 3, a static iron core 1, a moving iron core 2, a push rod 4 and a fixing device, wherein the sleeve structure 3 is a hollow rectangular metal structure or a hollow oblong metal structure with two ends through, and the cross-section and longitudinal section of the inner ring surface and the outer ring surface are both rectangular, or the cross-section of the inner ring surface and the outer ring surface is oblong and the longitudinal section is rectangular, the oblong is similar to the traditional waist shape or elliptical shape, and the waist shape or elliptical cross-section continuously extends in the axial direction to form an oblong body, the sleeve structure 3 is arranged in the through inner hole 201 of the coil skeleton 20, and the outer ring surface cooperates with the inner wall of the coil skeleton 20, such as basically fitting, and the gap is very small, only allowing sliding during assembly. The tail end of the static iron core 1 is inserted and fixed on the left side of the through inner hole of the sleeve structure 3. The front end of the static iron core 1 is convexly provided with a first guide head 11 extending out of the shell 10. The static iron core 1 is axially provided with a through hole 12 for the push rod 4 to pass through. The push rod 4 can be slidably arranged in the through hole 12. The moving iron core 2 is arranged in the through inner hole of the sleeve structure 3 and is located on the right side of the static iron core 1. The left end of the moving iron core 2 is against the right end of the push rod 4, and the right end of the moving iron core 2 is connected to the fixing device. In order to prevent the static iron core 1 and the moving iron core 2 from being attracted to each other, at least one of the left end face of the moving iron core 2 and the right end face of the static iron core 1 is a rough surface, and the rough surface can be provided in the form of a knurled surface, a convex cylindrical surface, or a turned surface.

[0033] The specific structure is as follows: the static iron core 1 is a rectangular parallelepiped structure or an oblong structure that matches the through inner hole 201 of the coil skeleton 20, the tail end of the static iron core 1 is a reduced diameter structure that matches the through inner hole of the sleeve structure 3, the static iron core 1 is fixedly arranged in the coil skeleton 20, the front end face of the static iron core 1 is flush with the left side of the shell 10, the front end face of the static iron core 1 is convexly provided with a reduced diameter cylindrical structure as a first guide head 11, the middle part of the front end face of the static iron core 1 is concavely provided with a first annular groove 13 coaxial with the through hole 12, the first guide head 11 is provided with a second annular groove 14, the inner diameter of the second annular groove 14 is larger than the first annular groove 13, and they are coaxially connected. The top rod 4 is a triangular prism structure with a triangular cross section, which can increase the gap between the through hole 12 of the static iron core 1 to facilitate the rapid passage of liquid or gas. The push rod 4 is inserted into the through hole 12 , the right end of the push rod 4 abuts against the inner end of the moving iron core 1 , and the left end of the push rod 4 extends into the second annular groove 14 to interact with the valve stem through the spring 40 .

[0034] The moving iron core 2 is a rectangular structure or an oblong structure that matches the through inner hole of the sleeve structure 3. The pilot valve assembly also includes a push rod 7. The fixing device includes a fixing block 5 and a fixing shell 6. The fixing block 5 is arranged on the outside of the right end of the moving iron core 2 and is fixed to the right end of the shell 10 through the fixing shell 6. The push rod 7 passes through the fixing block 5 and abuts against the right end of the moving iron core 2. When stuck or powered off, the moving iron core 2 is driven to move to the left by the push rod 7. The fixed block 5 is divided into three sections from left to right, wherein the first section is a reduced diameter section 53 which abuts against the right end of the moving iron core 2, the second section is a rectangular section or an oblong section 52 which cooperates with the through inner cavity of the sleeve structure 3, the third section is a reduced diameter second guide head 51, and an annular convex edge 54 which abuts against the right end of the sleeve structure 3 and limits the position is provided at the intersection of the second section and the third section. The outer periphery of the second guide head 51 is provided with an external thread, and an internal thread hole for the second guide head to pass through is provided in the middle of the fixed shell 6. The fixed shell 6 is threadedly connected and fixed to the second guide head 51 of the fixed block 5 by a threaded connection, and the inner side of the fixed shell 6 is fixed against the right side of the shell 10. A mounting hole for inserting the push rod 7 is axially opened in the middle of the fixed block 5, and a groove 21 coaxial with the mounting hole is provided in the middle of the right end face of the moving iron core 2. The diameter of the groove 21 is larger than the aperture of the mounting hole. The push rod 7 is divided into two left and right sections, of which the left section is an expanded diameter section and is provided with a connecting transverse groove 72 for convenient gas or liquid circulation. The left section of the push rod 7 is arranged in the groove 21, and its left and right sides are respectively abutted against the right end of the moving iron core 2 and the left end of the fixed block 5 for limiting. The right section of the push rod 7 is inserted into the mounting hole and lined with a sealing ring 73. The right end face of the push rod 7 is concavely provided with an arc surface 71 for easy manual pressing.

[0035] The sleeve structure 3 can be a stainless steel sleeve, a copper sleeve or an electrical iron sleeve or an iron sleeve. The sleeve structure 3 is divided into two left and right sections 31 and 32. The tail end of the static iron core 1 is inserted and fixed on the left side of the left section 31 of the sleeve structure 3, and the right side of the left section 32 of the sleeve structure 3 is fixedly connected to the right section 32 of the sleeve structure 3.

[0036] The working principle is:

[0037] When the power is on, the moving iron core 2 moves to the left, pushing the push rod 4 to move to the left to push the valve stem, so that the liquid or gas flows from the moving iron core 2 to the through hole 12 of the static iron core 1, and then flows into the second annular groove 14. At this time, the spring 40 is in a compressed state. When the power is off, the spring 40 resets, driving the valve stem to move to the right, so that the push rod 4 pushes the moving iron core 2 to the right to achieve the return. At this time, part of the liquid or gas will flow from the second annular groove 14 through the through hole 12 to the gap between the moving iron core 2 and the static iron core 1. At the same time, the liquid or gas behind the moving iron core 2 will also flow through the gap between the moving iron core 2 and the sleeve structure 3 to the gap between the moving iron core 2 and the static iron core 1.

[0038] Example 2

[0039] like Figure 3As shown, the difference from Example 1 is that the structure of the fixed shell 6 is different. The fixed shell 6 is a circular sleeve structure with an opening at the left end. A through hole is opened in the middle of the fixed shell 6 for the second guide head 51 to pass through. The outer peripheral surface of the right end of the sleeve structure 3 is provided with an external thread, and the inner annular surface of the fixed shell is provided with a corresponding internal thread. The fixed shell 5 is sleeved on the right end of the sleeve structure 3 and fixed to the sleeve structure 3 by a threaded connection.

[0040] The working principle is consistent with that of Example 1.

[0041] Example 3

[0042] like Figure 4 , 5 As shown, a pilot valve of the pilot valve assembly of embodiment 1 is installed, including a shell 10, a coil skeleton 20 for winding a coil is arranged in the shell 10, the longitudinal section of the inner hole 201 through the coil skeleton 20 is rectangular, and the corresponding sleeve structure 3 is a hollow rectangular metal structure with both ends passed through, and the static iron core 1 and the moving iron core 2 are rectangular structures matching the inner hole 201 through the coil skeleton 20 and the sleeve structure 3.

[0043] The housing 10 is a hollow metal frame structure. The left and right ends of the housing 10 are respectively provided with openings for the first pilot head 11 of the static iron core 1 and the right end of the sleeve structure 3 to extend out. A circuit board 8 is arranged inside the housing 10 and above the coil skeleton 20. A pin seat is arranged at the upper end of the circuit board 8. An opening for the pin seat to extend out is arranged at the upper end of the housing 10. Pins 9 extend out of the housing and are fixed on the pin seat. A conductive spring 50 is arranged at the bottom of the pin 9 to abut against the circuit board 8 to achieve electrical connection. The circuit board 8 is a circuit board suitable for AC or / and DC. The pins 9 are straight sheets. The sockets on the pin seat are corresponding straight holes. The pins 9 are located on the upper surface of the housing 20 after being fixed. The pilot valve also includes a wire coil bottom plate 30, which is fixed on the left end surface of the housing 10. The first guide head 11 passes through the wire coil bottom plate 30 and is exposed on the wire coil bottom plate 30.

[0044] Example 4

[0045] like Figure 6 As shown, a pilot valve installed with a pilot valve assembly of Example 1 differs from Example 4 in that the longitudinal section of the inner hole 201 of the coil skeleton 20 is an oblong, the cross-sections of the inner annular surface and the outer annular surface are oblong and the longitudinal section is rectangular, the oblong shape is similar to the traditional waist shape or elliptical shape, and the waist-shaped or elliptical cross-section continuously extends along the axis to form an oblong body, and the corresponding sleeve structure 3 has a hollow oblong metal structure with both ends passed through, and the static iron core 1 and the moving iron core 2 are oblong structures that match the inner hole 201 of the coil skeleton 20 and the sleeve structure 3.

[0046] Example 5

[0047] like Figure 7 , 8 As shown, a pilot valve installed with the pilot valve assembly of Example 1 is different from Example 3 in that the pin 9 is bent at a right angle, the plug hole of the pin seat is a corresponding right-angle bent hole, and the pin 9 is located on the front side of the upper surface of the shell 10 after being fixed.

[0048] Example 6

[0049] like Fig. 9 As shown, a pilot valve installed with a pilot valve assembly of Example 1 differs from Example 5 in that the longitudinal section of the through inner hole 201 of the coil skeleton 20 is an oblong, and the corresponding sleeve structure 3 is a hollow oblong metal structure with both ends passed through, and the static iron core 1 and the moving iron core 2 are oblong structures that match the through inner hole 201 of the coil skeleton 20 and the sleeve structure 3.

[0050] Example 7

[0051] like Fig.10 As shown, a pilot valve is different from Example 3 in that the pilot valve assembly adopts Example 2.

[0052] Example 8

[0053] like Fig.11 As shown, a pilot valve is different from Example 7 in that: the pin 9 is bent at a right angle, the plug hole of the pin seat is a corresponding right-angle bent hole, and the pin 9 is located on the front side of the upper surface of the shell 10 after being fixed.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A pilot valve assembly, comprising a housing, a coil frame for winding a coil is arranged in the housing, the coil frame having a through inner hole for the pilot valve assembly to pass through, characterized in that: It also includes a sleeve structure, a static iron core, a moving iron core, a push rod and a fixing device, wherein the sleeve structure is a hollow rectangular metal structure or a hollow oblong metal structure with two ends connected, and the cross section and longitudinal section of the inner ring surface and the outer ring surface are both rectangular, or the cross section of the inner ring surface and the outer ring surface are oblong and the longitudinal section is rectangular, the sleeve structure is arranged in the through inner hole of the coil frame, and the outer ring surface matches the inner wall of the coil frame; The tail end of the static iron core is inserted and fixed on the left side of the through inner hole of the sleeve structure, the front end of the static iron core is convexly provided with a first guide head extending out of the shell, and a through hole for the push rod to pass through is axially opened in the static iron core, and the push rod is slidably arranged in the through hole; The moving iron core is arranged in the through inner hole of the sleeve structure and is located on the right side of the static iron core. The left end of the moving iron core abuts against the right end of the push rod, and the right end of the moving iron core is connected to the fixing device. At least one of the left end surface of the moving iron core and the right end surface of the stationary iron core is a rough surface; The static iron core is a rectangular structure or an oblong structure that matches the through inner hole of the coil skeleton, the tail end of the static iron core is a reduced diameter structure that matches the through inner hole of the sleeve structure, the static iron core is fixedly arranged in the coil skeleton, the front end face of the static iron core is flush with the left side of the shell, the front end face of the static iron core is convexly provided with a reduced diameter cylindrical structure serving as a first guide head, the middle part of the front end face of the static iron core is concavely provided with a first annular groove coaxial with the through hole, a second annular groove is provided in the first guide head, the inner diameter of the second annular groove is larger than that of the first annular groove, the push rod is a triangular prism structure with a triangular cross section, the push rod is inserted in the through hole, the right end of the push rod is against the inner end of the moving iron core, and the left end of the push rod extends into the second annular groove to interact with the valve core through a spring; The sleeve structure is divided into two sections, the left and the right. The tail end of the static iron core is inserted and fixed on the left side of the left section of the sleeve structure, and the right side of the left section of the sleeve structure is fixedly connected to the right section of the sleeve structure. The pilot valve assembly also includes a wire coil bottom plate, which is fixed on the left end surface of the shell, and the first guide head passes through the wire coil bottom plate and is exposed outside the wire coil bottom plate.

2. The pilot valve assembly according to claim 1, characterized in that: The moving iron core is a rectangular structure or an oblong structure that matches the through inner hole of the sleeve structure. The pilot valve assembly also includes a push rod. The fixing device includes a fixed block and a fixed shell. The fixed block is arranged on the outside of the right end of the moving iron core and is fixed to the right end of the shell through the fixed shell. The push rod passes through the fixed block and abuts against the right end of the moving iron core. When stuck or power is off, the moving iron core is driven to move to the left by the push rod.

3. The pilot valve assembly according to claim 2, characterized in that: The fixed block is divided into three sections from left to right, wherein the first section is a reduced diameter section abutting against the right end of the moving iron core, the second section is a rectangular section or an oblong section matching the through inner cavity of the sleeve structure, the third section is a reduced diameter second guide head, and an annular convex edge abutting against the right end of the sleeve structure is provided at the intersection of the second section and the third section, and the outer peripheral surface of the right end of the sleeve structure is provided with an external thread, the fixed shell is a circular sleeve shell structure with an opening at the left end, and a through hole for the second guide head to pass through is provided in the middle of the fixed shell, the fixed shell is sleeved on the right end of the sleeve structure and is threadedly connected and fixed to the sleeve structure, or the outer periphery of the second guide head is provided with an external thread, and the fixed shell is threadedly connected and fixed to the second guide head of the fixed block through the corresponding internal thread hole.

4. The pilot valve assembly according to claim 3, characterized in that: A mounting hole for inserting a push rod is axially opened in the middle of the fixed block, and a groove coaxial with the mounting hole is provided in the middle of the right end face of the moving iron core, and the diameter of the groove is larger than the aperture of the mounting hole. The push rod is divided into left and right sections, wherein the left section is an expanded diameter section, the left section of the push rod is arranged in the groove, and its left and right sides are respectively restrained against the right end of the moving iron core and the left end of the fixed block, the right section of the push rod is inserted into the mounting hole, and the right end face of the push rod is concavely provided with an arc surface for facilitating manual pressing.

5. The pilot valve assembly according to any one of claims 1 to 3, characterized in that: The shell is a hollow metal frame structure, and the left and right ends of the shell are respectively provided with openings for the first pilot head of the static iron core and the right end of the sleeve structure to extend out. A circuit board is arranged inside the shell and above the coil skeleton, and a pin seat is arranged at the upper end of the circuit board. An opening is arranged at the upper end of the shell for the pin seat to extend out. The pins extend out of the shell and are fixed on the pin seat. A conductive spring is arranged at the bottom of the pin to abut against the circuit board to achieve electrical connection.

6. The pilot valve assembly according to claim 5, characterized in that: The pin is in the shape of a straight sheet, the socket on the pin seat is a corresponding straight hole, and the pin is located on the upper surface of the shell after being fixed; or, the pin is in the shape of a right-angle bend, the socket of the pin seat is a corresponding right-angle bend hole, and the pin is located on the front side of the upper surface of the shell after being fixed.

7. The pilot valve assembly according to any one of claims 1 to 3, characterized in that: The rough surface is provided as a knurled surface, a convex cylindrical surface or a turned surface.

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