An electromagnetic valve

Abstract

The application discloses an electromagnetic valve, which comprises a shell, a magnetic drive assembly arranged on the shell, the magnetic drive assembly comprising a static iron core, a coil unit arranged above the static iron core and a dynamic iron core arranged inside the coil unit, a valve seat arranged below the static iron core, the valve seat being provided with a containing cavity, a working port and a flow channel, the working port being arranged below the containing cavity and in communication with the containing cavity, the flow channel being arranged outside the containing cavity and in communication with the containing cavity, a valve core arranged in the containing cavity and in transmission connection with the dynamic iron core, the dynamic iron core moving to drive the valve core to move up and down, so that the valve core has positions to open or close the working port, and an elastic diaphragm, the inner end of the elastic diaphragm being in sealing connection with the peripheral side of the valve core, and the outer end being in sealing connection with the valve seat, the electromagnetic valve having the characteristics of compact structure, good sealing performance and stable and reliable operation. The application relates to the technical field of electromagnetic valves.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic valve, more particularly to an electromagnetic valve. BACKGROUND

[0002] The electromagnetic valve is one of the indispensable components of automobile products, and its main function is to realize the on-off function of the pipeline.

[0003] The valve core is generally connected with the moving iron core of the electromagnetic assembly by a guide rod. The existing electromagnetic valve drives the valve core to move to adjust the opening degree of the working port by using the electromagnetic assembly when power is on.

[0004] When power is off, the reset spring can drive the valve core to reset.

[0005] A plastic guide ring needs to be arranged on the valve body, and the inner hole of the guide ring is sleeved on the guide rod, and the outer side is fitted on the valve body. The guide ring plays a guiding and sealing role on the guide rod.

[0006] During operation, the guide ring and the guide rod are prone to jamming, which reduces the stability of the valve core operation, and the sealing performance will decrease over a long period of use. SUMMARY

[0007] In view of the deficiencies and defects of the prior art, a compact structure, good sealing performance, and stable and reliable electromagnetic valve is provided.

[0008] An electromagnetic valve comprises:

[0009] A housing is provided with an electromagnetic drive assembly, which comprises a static iron core, a coil unit arranged above the static iron core, and a moving iron core arranged inside the coil unit.

[0010] A valve seat is arranged below the static iron core, and the valve seat is provided with a containing cavity, a working port, and a flow channel.

[0011] The working port is arranged below the containing cavity and communicates with the containing cavity.

[0012] A valve core is arranged in the containing cavity, and the valve core is in driving connection with the moving iron core.

[0013] The moving iron core moves to drive the valve core to move up and down, so that the valve core has positions to open or close the working port.

[0014] An elastic diaphragm is in sealing connection between the inner end of the elastic diaphragm and the peripheral side of the valve core, and in sealing connection between the outer end of the elastic diaphragm and the valve seat.

[0015] The elastic diaphragm can elastically deform to make the inner end move with the valve core and always maintain the sealing effect.

[0016] With the above structure, compared with the prior art, the electromagnetic valve has the following advantages: when the coil unit is powered on, the moving iron core moves downward to cooperate with the static iron core, and drives the valve core to close the working port, at this time, the working port is cut off from the flow passage, and the medium cannot pass through;

[0017] When the coil unit is powered off, the reset assembly (spring arranged between the static iron core and the moving iron core) drives the valve core to move upward to open the working port, and drives the moving iron core to move upward, at this time, the working port is communicated with the flow passage, and the medium can pass through;

[0018] The valve core is driven by the electromagnetic force of the coil unit to move to close or open the working port, which has the characteristics of fast response, can quickly open or close the medium flow, can accurately control the flow and pressure of the medium, and is suitable for occasions requiring accurate control.

[0019] The elastic diaphragm is arranged between the valve seat and the valve core to form an effective seal between the valve core and the valve seat, prevent the medium in the accommodating cavity from leaking out, and at the same time, does not affect the normal communication of the working port, the accommodating cavity and the flow passage,

[0020] When the valve core reciprocates, the elastic diaphragm elastically deforms to change the position of the valve core, and the elastic diaphragm can always maintain the sealing effect, so that the device runs reliably.

[0021] As an improvement of the present application, the inner end of the elastic diaphragm is provided with a first T-shaped block, and the outer end is provided with a second T-shaped block;

[0022] The valve core is provided with a first engagement groove for engaging the first T-shaped block, and the valve seat is provided with a second engagement groove for engaging the second T-shaped block.

[0023] As an improvement of the present application, an upward extending connecting part is arranged above the valve seat, and the connecting part is detachably connected below the static iron core,

[0024] An inward extending flange is formed inside the connecting part, a upward extending limiting protrusion is arranged above the flange, and a first clamping groove is formed between the inside of the connecting part and the limiting protrusion;

[0025] The accommodating cavity is arranged through the valve seat;

[0026] The static iron core is provided with a cooperating hole opposite to the accommodating cavity above and below;

[0027] The static iron core is provided with a second clamping groove opposite to the first clamping groove;

[0028] The second clamping groove and the first clamping groove are combined to form the first engagement groove.

[0029] As an improvement of the present application, the moving iron core is connected with a guide rod, the lower end of the guide rod penetrates into the matching hole of the static iron core and is connected with the valve core,

[0030] The guide rod is provided with an extension part extending outward, and a third clamping groove is formed below the extension part;

[0031] The valve core is provided with a fourth clamping groove opposite to the third clamping groove, and the second matching groove is formed after the combination of the third clamping groove and the fourth clamping groove.

[0032] As an improvement of the present application, the coil unit comprises a coil framework and a coil wound in the wire slot outside the coil framework;

[0033] The inside of the coil framework is provided with a sliding hole extending upward and downward,

[0034] The inner wall of the sliding hole is provided with a guide part extending along the moving direction of the moving iron core;

[0035] The guide part is in a number of several and is arranged in intervals around the moving iron core,

[0036] The inside of the guide part is in contact with the outer periphery of the moving iron core and plays a guiding role on the moving iron core when the moving iron core moves upward and downward.

[0037] As an improvement of the present application, the coil framework is provided with a coil lead-out pin above;

[0038] The coil framework is integrally encapsulated after winding, and the coil unit formed after the integral encapsulation is matched and connected in the inner hole of the shell.

[0039] As an improvement of the present application, the upper end surface of the static iron core is in abutment with the lower end surface of the coil framework, and the shell is provided with a buckling groove buckled on the outside of the static iron core;

[0040] The upper end surface of the static iron core is provided with a protruding column extending upward, and the protruding column penetrates into the lower part of the sliding hole;

[0041] The protruding column is provided with a guide hole, and the guide hole is penetrated by the guide rod and plays a guiding role on the guide rod.

[0042] As an improvement of the present application, the guide rod is in a hollow structure, the valve core is provided with a flow guide hole penetrating upward and downward, the moving iron core is provided with a through hole penetrating upward and downward, a first gap is formed between the adjacent guide parts and the moving iron core, and a second gap is formed between the guide hole and the guide rod;

[0043] The flow guide hole, the inner hole of the guide rod, the through hole, the first gap and the second gap form a drainage structure of the matching hole.

[0044] An improved aspect of the present application is that a supporting groove is formed between the inner side of the limiting protrusion and the inner side of the connecting portion,

[0045] A supporting washer is connected in the supporting groove, and the supporting washer supports the lower part of the elastic diaphragm, and the inner diameter of the supporting washer is the same as the inner diameter of the matching hole.

[0046] An improved aspect of the present application is that a damping spring is arranged between the upper end of the moving iron core and the upper end of the sliding hole. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 is a structural schematic diagram of the present application.

[0048] Figure 2 is a sectional view schematic diagram of the present application when the valve core moves to the closed working port under the condition of power on.

[0049] Figure 3 is a sectional view schematic diagram of the present application when the valve core moves to the opened working port under the condition of power off. Figure 2 is an enlarged schematic diagram of the structure of A in the present application.

[0050] Figure 4 is a sectional view schematic diagram of the present application when the valve core moves to the closed working port under the condition of power on.

[0051] Figure 5 is a structural schematic diagram of the zero-coil unit of the present application.

[0052] Figure 6 is a structural schematic diagram of the present application when the valve core moves to the closed working port under the condition of power on. Figure 5 is a structural schematic diagram of the parts in the explosion state of the present application.

[0053] Figure 7 is a structural schematic diagram of the coil framework and the rubber coating in the sectional view of the present application.

[0054] Figure 8 is a structural schematic diagram of the coil framework of the present application.

[0055] As shown in the figure: 1, the shell; 2, the static core; 2.1, the matching hole; 2.2, the second clamping groove; 2.3, the convex column; 2.31, the guide hole; 3, the coil unit; 3.1, the coil skeleton; 3.11, the sliding hole; 3.111, the guide part; 3.12, the lead-out pin; 3.13, the rubber coating; 3.2, the coil; 4, the moving core; 4.1, the through hole; 5, the valve seat; 5.1, the accommodating cavity; 5.2, the working port; 5.3, the flow channel; 5.4, the guide rod; 5.41, the extension; 5.42, the third clamping groove; 6, the valve core; 6.1, the flow guide hole; 6.2, the fourth clamping groove; 7, the elastic diaphragm; 7.1, the first T-shaped block; 7.2, the second T-shaped block; 8, the connecting part; 8.1, the flange; 8.11, the limiting protrusion; 8.111, the supporting groove; 8.12, the first clamping groove; 9, the first gap; 10, the second gap; 11, the supporting washer; 12, the damping spring. DETAILED DESCRIPTION

[0056] The application will be further described below in conjunction with the drawings and specific embodiments.

[0057] The Figure 3 The medium path when the valve core opens the working port is indicated by the medium green line.

[0058] The Figure 4 The gas flow path when the atmospheric pressure on the upper and lower sides of the elastic diaphragm is balanced is indicated by the medium red line.

[0059] Please refer to Figures 1-4 As shown in the figure, an electromagnetic valve comprises:

[0060] The shell 1 is provided with an electromagnetic driving assembly, which comprises the static core 2, the coil unit 3 arranged above the static core 2, and the moving core 4 arranged inside the coil unit 3;

[0061] The valve seat 5 is arranged below the static core 2, and the valve seat 5 is provided with the accommodating cavity 5.1, the working port 5.2, and the flow channel 5.3;

[0062] The working port 5.2 is arranged below the accommodating cavity 5.1 and communicates with the accommodating cavity 5.1, and the flow channel 5.3 is arranged outside the accommodating cavity 5.1 and communicates with the accommodating cavity 5.1;

[0063] The valve core 6 is arranged in the accommodating cavity 5.1, and the valve core 6 is in transmission connection with the moving core 4;

[0064] The moving core 4 moves to drive the valve core 6 to move up and down, so that the valve core 6 has positions to open or close the working port 5.2;

[0065] The elastic diaphragm 7 is in sealed connection with the outer end of the valve core 6 and the valve seat 5.

[0066] The elastic diaphragm 7 can elastically deform to follow the movement of the valve core 6 and always maintain sealing effect.

[0067] When the coil unit 3 is powered, the moving iron core 4 moves downward to cooperate with the static iron core 2 and drives the valve core 6 to close the working port 5.2, at this time, the working port 5.2 is cut off from the flow channel 5.3, and the medium cannot pass through;

[0068] When the coil unit 3 is powered off, the reset assembly (spring arranged between the static iron core 2 and the moving iron core 4) drives the valve core 6 to move upward to open the working port 5.2 and drives the moving iron core 4 to move upward, at this time, the working port 5.2 is connected with the flow channel 5.3, and the medium can pass through;

[0069] The valve core 6 is driven by the electromagnetic force of the coil unit 3 to close or open the working port 5.2, which has the characteristics of fast response speed, can quickly open or close the medium flow, can accurately control the flow and pressure of the medium, and is suitable for occasions that require accurate control.

[0070] The elastic diaphragm 7 is arranged between the valve seat 5 and the valve core 6 to form an effective seal between the valve core 6 and the valve seat 5, prevent the medium in the accommodating cavity 5.1 from overflowing, and at the same time, not affect the normal communication of the working port 5.2, the accommodating cavity 5.1 and the flow channel 5.3,

[0071] When the valve core 6 reciprocates, the elastic diaphragm 7 elastically deforms to follow the position change of the valve core 6, and the elastic diaphragm 7 can always maintain sealing effect, so that the device runs reliably.

[0072] Compared with the structure of the traditional guide ring, the device has the characteristics of good sealing performance, high operation reliability and long service life.

[0073] Please refer to Figures 3-4 As shown in the figure, the inner end of the elastic diaphragm 7 is provided with a first T-shaped block 7.1, and the outer end is provided with a second T-shaped block 7.2.

[0074] The valve core 6 is provided with a first fitting groove for fitting the first T-shaped block 7.1, and the valve seat 5 is provided with a second fitting groove for fitting the second T-shaped block 7.2.

[0075] The above improvement makes the inner end of the elastic diaphragm 7 reliably connected with the valve core 6, and the outer end reliably connected with the valve seat 5, so that the elastic diaphragm 7 is connected stably, and the device has high operation reliability.

[0076] The valve seat 5 is provided with a connection part 8 extending upward, which is detachably connected below the static iron core 2,

[0077] The inner side of the connecting part 8 is formed with a flange 8.1 extending inwardly, and a limiting protrusion 8.11 extending upwardly is arranged above the flange 8.1, and a first clamping groove 8.12 is formed between the inner side of the connecting part 8 and the limiting protrusion 8.11;

[0078] The upper side of the accommodating cavity 5.1 is provided with a valve seat 5;

[0079] The lower side of the static iron core 2 is provided with a matching hole 2.1 opposite to the upper side of the accommodating cavity 5.1;

[0080] The lower side of the static iron core 2 is provided with a second clamping groove 2.2 opposite to the first clamping groove 8.12;

[0081] The second clamping groove 2.2 and the first clamping groove 8.12 form a first engagement groove after being combined.

[0082] After the above improvement, the valve seat 5 forms an integral first clamping groove 8.12 after forming, the static iron core 2 forms an integral second clamping groove 2.2 after forming, and the first clamping groove 8.12 and the second clamping groove 2.2 can form a first engagement groove after the static iron core 2 and the valve seat 5 are connected, which can be more compact in structure, beneficial to the miniaturization of the whole, and suitable for use on a space-limited car.

[0083] And the first clamping groove 8.12 and the second clamping groove 2.2 are respectively clamped on the upper and lower sides of the first T-shaped block 7.1, which can ensure good sealing performance;

[0084] The bottom of the static iron core 2 has a hole body for inserting the connecting part 8, and the outer wall of the connecting part 8 is connected to the hole body in an interference fit connection mode to ensure the sealing performance.

[0085] Please refer to Figures 2-4 As shown in the figure, the moving iron core 4 is connected with a guide rod 5.4, the lower end of the guide rod 5.4 penetrates into the matching hole 2.1 of the static iron core 2, and is connected with the valve core 6,

[0086] The guide rod 5.4 is provided with an extension part extending outwardly on the side, and a third clamping groove is formed below the extension part;

[0087] The valve core 6 is provided with a fourth clamping groove 6.2 opposite to the third clamping groove, and the fourth clamping groove 6.2 and the third clamping groove 5.42 form a second engagement groove after being combined.

[0088] The moving iron core 4 is provided with an inner threaded hole penetrating upwardly and downwardly, and the upper end of the guide rod 5.4 penetrates from the lower part of the inner threaded hole and is threadedly connected with the inner threaded hole;

[0089] The guide rod 5.4 is formed with a third clamping groove 5.42 after molding, and the valve core 6 is formed with a fourth clamping groove 6.2 after molding. After the guide rod 5.4 and the valve core 6 are assembled, the third clamping groove 5.42 and the fourth clamping groove 6.2 can be combined to form a second engagement groove, which can be more compact in structure. The connecting structure formed by the structure of the parts can fix the elastic diaphragm 7, which is beneficial to the miniaturization of the whole and is suitable for use on space-limited cars.

[0090] Please refer to Figures 2-7 As shown in the figure, the coil unit 3 includes a coil skeleton 3.1, and a coil 3.2 wound in the wire slot outside the coil skeleton 3.1;

[0091] The inside of the coil skeleton 3.1 is provided with a sliding hole 3.11 extending upward and downward,

[0092] The inner wall of the sliding hole 3.11 is provided with a guide part 3.111 extending along the moving direction of the moving iron core 4;

[0093] The number of guide parts 3.111 is several, and they are arranged in intervals around the moving iron core 4,

[0094] The inside of the guide part 3.111 contacts with the outer periphery of the moving iron core 4, and plays a guiding role on the moving iron core 4 when the moving iron core 4 moves up and down.

[0095] The inside of the traditional coil skeleton 3.1 needs to be provided with a metal magnetic shielding sleeve, and the moving iron core 4 is placed in the sliding hole 3.11 of the metal magnetic shielding sleeve, and the metal magnetic shielding sleeve plays a guiding role on the moving iron core 4;

[0096] The guide part 3.111 provided in the sliding hole 3.11 of the coil skeleton 3.1 plays a guiding role on the up and down movement of the moving iron core 4, and the metal magnetic shielding sleeve in the traditional structure is cancelled, and the function of guiding and positioning is integrated into the guide part 3.111 of the coil skeleton 3.1 itself, instead of the function of the magnetic shielding sleeve, reducing a part and reducing the cost.

[0097] The guide part 3.111 is a vertical rib, and is designed in an integral molding structure with the coil skeleton 3.1.

[0098] Please refer to Figures 4-6 As shown in the figure, the coil skeleton 3.1 is provided with a coil 3.2 lead pin 3.12 above;

[0099] The coil skeleton 3.1 is integrally encapsulated 3.13 after winding, and the coil unit 3 formed after the integrally encapsulated 3.13 is connected in the inner hole of the shell 1;

[0100] The coil skeleton 3.1 is installed with a yoke after winding, and then the whole plastic injection encapsulation 3.13 is performed, and the mounting plane and the connector shell 1 are injection molded.

[0101] The process has the advantages of reducing the mutual assembly of multiple parts, reducing the size tolerance of individual parts, and retaining only the most basic functions of individual parts, thereby greatly reducing costs.

[0102] Please refer to Figures 2-8 As shown, the upper end surface of the static iron core 2 abuts against the lower end surface of the coil frame 3.1, and the shell 1 is provided with a buckling groove buckled on the outer side of the static iron core 2;

[0103] The upper end surface of the static iron core 2 is provided with a protruding column 2.3 extending upward, and the protruding column 2.3 extends into the lower part of the sliding hole 3.11;

[0104] The protruding column 2.3 is provided with a guide hole 2.31 through which the guide rod 5.4 passes and which guides the guide rod 5.4.

[0105] After the improvement, the connection between the parts is stable, and the device runs reliably.

[0106] The guide hole 2.31 on the protruding column 2.3 guides the guide rod 5.4, which has the characteristics of simple structure, compactness, and small size, compared with the traditional guide positioning structure, and has a lower cost;

[0107] The guide hole 2.31 guides the guide rod 5.4, and the guide hole 2.31 guides the guide rod 5.4, which makes the movement of the valve core 6 stable and smooth, and improves the reliability of the device.

[0108] The guide rod 5.4 is hollow, the valve core 6 is provided with an upper and lower through-flow hole 6.1, the moving iron core 4 is provided with an upper and lower through hole 4.1, and the adjacent guide part 3.111 and the moving iron core 4 form a first gap 9, and the guide hole 2.31 and the guide rod 5.4 form a second gap 10;

[0109] The through-flow hole 6.1, the inner hole of the guide rod 5.4, the through hole 4.1, the first gap 9, and the second gap 10 form a drainage structure of the matching hole 2.1.

[0110] The through-flow hole 6.1 is an internally threaded hole, the lower part of the guide rod 5.4 is provided with an external thread, and is screwed with the internally threaded hole on the valve core 6.

[0111] The through-flow hole 6.1, the inner hole of the guide rod 5.4, the through hole 4.1, the first gap 9, and the second gap 10 form a drainage structure of the matching hole 2.1, which connects the upper space of the elastic diaphragm 7 to the outside atmosphere, ensuring the balance of internal and external pressure, and the internal and external pressure acts on both sides of an elastic diaphragm 7, the both ends of the elastic diaphragm 7 are pressed and fixed, and the middle part is isolated from the internal and external channels, so that the elastic diaphragm 7 can stably deform and maintain the sealing effect.

[0112] Referring to Figures 2-4 As shown, a support groove 8.111 is formed between the inner side of the limiting protrusion 8.11 and the inner side of the connecting part 8,

[0113] A support washer 11 is fitted in the support groove 8.111, and the support washer 11 supports the lower part of the elastic diaphragm 7, and the inner diameter of the support washer 11 is the same as the inner diameter of the fitting hole 2.1.

[0114] After the valve seat 5 is formed, the integrated support groove 8.111 is formed for assembling the support washer 11, so that the structure is more compact, and the device is miniaturized.

[0115] The support washer 11 supports the outer side of the lower part of the elastic diaphragm 7, and the bottom wall of the fitting hole 2.1 supports the outer side of the upper part of the support washer 11, and the two support actions are combined with each other, so that the elastic diaphragm 7 is assembled more stably.

[0116] In addition, the inner diameter of the support washer 11 is consistent with the inner diameter of the fitting hole 2.1, so that the area of the upper and lower leakage of the diaphragm is consistent, and then the upper and lower pressure areas are unified, so that the diaphragm can effectively elastically deform, and the operation reliability is better.

[0117] A damping spring 12 is arranged between the upper end of the moving iron core 4 and the upper end of the sliding hole 3.11. The damping spring 12 plays a damping and buffering role between the upper end of the moving iron core 4 and the upper end of the sliding hole 3.11, compared with the traditional sponge damping structure, has the characteristics of long service life and high operation reliability.

[0118] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments, and any technical solution belonging to the idea of the present application shall belong to the protection scope of the present application. It should be noted that for ordinary skilled in the art, some improvements and decorations without departing from the principle of the present application shall be considered as the protection scope of the present application.

Claims

1. A solenoid valve, characterized in that, include: The outer shell (1) is provided with an electromagnetic drive assembly, which includes a stationary iron core (2), a coil unit (3) disposed above the stationary iron core (2), and a moving iron core (4) disposed inside the coil unit (3). Valve seat (5), the valve seat (5) is located below the stationary iron core (2), and the valve seat (5) is provided with a receiving cavity (5.1), a working port (5.2), and a flow channel (5.3). The working port (5.2) is located below the receiving cavity (5.1) and is connected to the receiving cavity (5.1); Valve core (6), the valve core (6) is placed in the accommodating cavity (5.1), and the valve core (6) is connected to the moving iron core (4) in a transmission manner; The moving iron core (4) drives the valve core (6) to move up and down, so that the valve core (6) has a position to open or close the working port (5.2); An elastic diaphragm (7) is provided, with its inner end sealed to the circumference of the valve core (6) and its outer end sealed to the valve seat (5). The elastic diaphragm (7) can be elastically deformed so that the inner end moves with the valve core (6) and always maintains a sealing effect; The moving iron core (4) is connected to a guide rod (5.4), the lower end of which passes through the mating hole (2.1) of the stationary iron core (2) and is connected to the valve core (6); The coil unit (3) includes a coil frame (3.1) and a coil (3.2) wound in the outer groove of the coil frame (3.1). The inner side of the coil frame (3.1) is provided with a sliding hole (3.11) that extends vertically. The inner wall of the sliding hole (3.11) is provided with a guide portion (3.111) extending along the moving direction of the moving iron core (4). The guide portions (3.111) are numerous and are arranged at intervals around the moving iron core (4). The inner side of the guide part (3.111) contacts the outer periphery of the moving iron core (4) and guides the moving iron core (4) when it moves up and down. The upper end face of the stationary iron core (2) is provided with an upwardly extending protrusion (2.3), which extends into the lower part of the sliding hole (3.11); The protruding post (2.3) is provided with a guide hole (2.31), which allows the guide rod (5.4) to pass through and guides the guide rod (5.4). The guide rod (5.4) has a hollow structure. The valve core (6) is provided with a flow guide hole (6.1) that runs through the top and bottom. The moving iron core (4) is provided with a through hole (4.1) that runs through the top and bottom. A first gap (9) is formed between the adjacent guide part (3.111) and the moving iron core (4). A second gap (10) is formed between the guide hole (2.31) and the guide rod (5.4). The guide hole (6.1), the inner hole of the guide rod (5.4), the through hole (4.1), the first gap (9), and the second gap (10) form a flow-guiding structure that connects to the mating hole (2.1).

2. The solenoid valve according to claim 1, characterized in that: The elastic diaphragm (7) has a first T-shaped block (7.1) at its inner end and a second T-shaped block (7.2) at its outer end. The valve core (6) is provided with a first mating groove for the first T-shaped block (7.1) to fit, and the valve seat (5) is provided with a second mating groove for the second T-shaped block (7.2) to fit.

3. A solenoid valve according to claim 2, characterized in that: The valve seat (5) is provided with an upwardly extending connecting part (8), which is detachably connected to the bottom of the stationary iron core (2). An inwardly extending flange (8.1) is formed on the inner side of the connecting part (8), and an upwardly extending limiting protrusion (8.11) is provided above the flange (8.1). A first slot (8.12) is formed between the inner side of the connecting part (8) and the limiting protrusion (8.11). The valve seat (5) is positioned above the accommodating cavity (5.1); The stationary iron core (2) is provided with a mating hole (2.1) that is vertically opposite to the accommodating cavity (5.1) below it. Below the stationary iron core (2), there is also a second slot (2.2) opposite to the first slot (8.12); The second slot (2.2) and the first slot (8.12) are combined to form the first fitting slot.

4. A solenoid valve according to claim 2, characterized in that: The guide rod (5.4) has an outwardly extending extension (5.41) around its periphery, and a third slot (5.42) is formed below the extension (5.41). The valve core (6) is provided with a fourth slot (6.2) opposite to the third slot (5.42), and the fourth slot (6.2) and the third slot (5.42) are combined to form the second mating groove.

5. A solenoid valve according to claim 1, characterized in that: A coil (3.2) lead-out pin (3.12) is provided above the coil frame (3.1). The coil frame (3.1) is completely wrapped with glue (3.13) after winding, and the coil unit (3) formed after being completely wrapped with glue (3.13) fits into the inner hole of the outer shell (1).

6. A solenoid valve according to claim 1, characterized in that: The upper end face of the stationary iron core (2) abuts against the lower end face of the coil frame (3.1), and the outer shell (1) is provided with a fastening groove to fasten to the outside of the stationary iron core (2).

7. A solenoid valve according to claim 3, characterized in that: A support groove (8.111) is formed between the inner side of the limiting protrusion (8.11) and the inner side of the connecting part (8). A support washer (11) is fitted inside the support groove (8.111). The support washer (11) is supported on the lower part of the elastic diaphragm (7), and the inner diameter of the support washer (11) is the same as the inner diameter of the mating hole (2.1).

8. A solenoid valve according to claim 1, characterized in that: A shock-absorbing spring (12) is provided between the upper end of the moving iron core (4) and the upper end of the sliding hole (3.11).

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