Electromagnetic valve

Abstract

The electromagnetic valve comprises a shell, an electromagnetic driving assembly is arranged on the shell, and the electromagnetic driving assembly comprises a static iron core, a coil unit arranged above the static iron core and a movable iron core arranged on the inner side of the coil unit; the valve seat is arranged below the static iron core, and a containing cavity, a working opening and a flow channel are formed in the valve seat; the working port is located below the containing cavity and communicated with the containing cavity, and the flow channel is located on the outer side of the containing cavity and communicated with the containing cavity. The valve element is arranged in the containing cavity, and the valve element is in transmission connection with the movable iron core. The movable iron core moves to drive the valve core to move up and down, so that the valve core has a position for opening or closing the working port; the inner end of the elastic diaphragm is connected with the peripheral side of the valve element in a sealed mode, and the outer end of the elastic diaphragm is connected with the valve seat in a sealed mode. The invention relates to the technical field of electromagnetic valves.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valves, and more specifically to a solenoid valve. Background Art

[0002] The solenoid valve is one of the essential components of automotive products, and its main function is to realize the on-off function of the pipeline.

[0003] The valve core is generally connected to the moving iron core of the electromagnetic assembly by a guide rod. The existing solenoid valve uses the electromagnetic assembly to drive the valve core to move when power is turned on to adjust the opening of the working port.

[0004] When the power is off, the return spring can drive the valve core to return to its original position.

[0005] A plastic guide ring needs to be set on the valve body. The inner hole of the guide ring is set on the guide rod, and the outer side fits on the valve body. The guide ring guides and seals the guide rod.

[0006] During operation, the guide ring and guide rod are prone to getting stuck, which reduces the operating stability of the valve core and the sealing performance will decrease during long-term use. Summary of the invention

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

[0008] A solenoid valve, comprising:

[0009] A housing, wherein an electromagnetic drive assembly is disposed on the housing, wherein the electromagnetic drive assembly includes a static iron core, a coil unit disposed above the static iron core, and a moving iron core disposed inside the coil unit;

[0010] A valve seat, the 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 located below the accommodating cavity and communicates with the accommodating cavity;

[0012] A valve core, the valve core is placed in the accommodating cavity, and the valve core is drivingly connected to the moving iron core;

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

[0014] An elastic diaphragm, wherein the inner end of the elastic diaphragm is sealedly connected to the periphery of the valve core, and the outer end of the elastic diaphragm is sealedly connected to the valve seat,

[0015] The elastic diaphragm can be deformed elastically so that the inner end moves along with the valve core and always maintains a sealing effect.

[0016] After adopting the above structure, the electromagnetic valve of the present invention has the following advantages compared with the prior art: when the coil unit is energized, 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 and the flow channel are cut off from each other, and the medium cannot pass through;

[0017] When the coil unit is powered off, the reset assembly (a spring disposed 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 connected to the flow channel and the medium can pass through.

[0018] The electromagnetic force of the coil unit drives the valve core to close or open the working port. It has the characteristics of fast response speed and can quickly open or close the flow of the medium. It can accurately control the flow and pressure of the medium and is suitable for occasions that require precise control.

[0019] The elastic diaphragm between the valve seat and the valve core forms an effective seal between the valve core and the valve seat to prevent the medium in the accommodating chamber from leaking out. At the same time, it does not affect the normal communication between the working port, the accommodating chamber, and the flow channel.

[0020] When the valve core reciprocates, the elastic deformation of the elastic diaphragm accompanies the position change of the valve core, and the elastic diaphragm can always maintain a sealing effect, so that the device can operate reliably.

[0021] As an improvement of the present invention, 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 fitting groove for the first T-shaped block to fit into, and the valve seat is provided with a second fitting groove for the second T-shaped block to fit into.

[0023] As an improvement of the present invention, a connecting portion extending upward is provided above the valve seat, and the connecting portion is detachably connected to the bottom of the static iron core.

[0024] A flange extending inward is formed on the inner side of the connecting portion, a limiting protrusion extending upward is provided above the flange, and a first clamping groove is formed between the inner side of the connecting portion and the limiting protrusion;

[0025] The arrangement of the valve seat passing through the upper part of the accommodating cavity;

[0026] A matching hole is provided below the static iron core and is opposite to the accommodating cavity in the upper and lower directions;

[0027] A second slot opposite to the first slot is provided below the static iron core;

[0028] The second card slot is combined with the first card slot to form the first fitting slot.

[0029] As an improvement of the present invention, the movable iron core is connected to a guide rod, the lower end of the guide rod penetrates into the matching hole of the static iron core and is connected to the valve core.

[0030] An extension portion extending outward is arranged on the peripheral side of the guide rod, and a third clamping groove is formed below the extension portion;

[0031] The valve core is provided with a fourth clamping groove opposite to the third clamping groove, and the fourth clamping groove is combined with the third clamping groove to form the second fitting groove.

[0032] As an improvement of the present invention, the coil unit includes a coil frame, and a coil wound in a wire slot outside the coil frame;

[0033] The inner side of the coil frame is provided with a sliding hole extending up and down.

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

[0035] There are several guide parts, which are arranged at intervals around the moving iron core.

[0036] The inner side of the guide portion contacts the outer periphery of the moving iron core and guides the moving iron core when the moving iron core moves up and down.

[0037] As an improvement of the present invention, a coil lead pin is arranged above the coil frame;

[0038] The coil frame is entirely covered with rubber after winding, and the coil unit formed after the entire covering is fitted and connected to the inner hole of the shell.

[0039] As an improvement of the present invention, the upper end surface of the static iron core is tightly pressed against the lower end surface of the coil frame, and the shell is provided with a snap-fit ​​groove snap-fitted on the outer side of the static iron core;

[0040] The upper end surface of the static iron core is provided with a convex column extending upward, and the convex column extends to the bottom of the sliding hole;

[0041] The convex column is provided with a guide hole, through which the guide rod passes and guides the guide rod.

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

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

[0044] As an improvement of the present invention, a support groove is formed between the inner side of the limiting protrusion and the inner side of the connecting portion.

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

[0046] As an improvement of the present invention, a shock absorbing spring is disposed between the upper end of the moving iron core and the upper end top of the sliding hole. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0048] Figure 2 It is a cross-sectional schematic diagram of the present invention when the valve core moves to the closed working port when power is turned on.

[0049] Figure 3 The present invention Figure 2 A schematic diagram of the enlarged structure in the middle.

[0050] Figure 4 It is a cross-sectional schematic diagram of the present invention when the valve core moves to open the working port in the case of power failure.

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

[0052] Figure 6 The present invention Figure 5 Schematic diagram of the structure of the components in the exploded state.

[0053] Figure 7 It is a schematic diagram of the structure of the coil skeleton and the rubber coating in cross-section of the present invention.

[0054] Figure 8 It is a schematic structural diagram of the coil skeleton of the present invention.

[0055] As shown in the figure: 1. Shell; 2. Stationary iron core; 2.1. Matching hole; 2.2. Second slot; 2.3. Boss; 2.31. Guide hole; 3. Coil unit; 3.1. Coil frame; 3.11. Sliding hole; 3.111. Guide part; 3.12. Lead pin; 3.13. Rubber coating; 3.2. Coil; 4. Moving iron core; 4.1. Through hole; 5. Valve seat; 5.1. Accommodating cavity; 5.2. Working port; 5.3. Flow channel ; 5.4, guide rod; 5.41, extension part; 5.42, third slot; 6, valve core; 6.1, guide hole; 6.2, fourth slot; 7, elastic diaphragm; 7.1, first T-shaped block; 7.2, second T-shaped block; 8, connecting part; 8.1, flange; 8.11, limiting protrusion; 8.111, supporting groove; 8.12, first slot; 9, first gap; 10, second gap; 11, supporting washer; 12, shock-absorbing spring. DETAILED DESCRIPTION

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

[0057] Attached Figure 3 The green line in the middle shows the path of the medium when the valve core opens the working port.

[0058] Attached Figure 4 The red line in the middle shows the flow path of the gas when the atmospheric pressure on the upper and lower sides of the elastic diaphragm is balanced.

[0059] See also Figure 1-4 As shown, a solenoid valve comprises:

[0060] A housing 1 is provided with an electromagnetic drive assembly, the electromagnetic drive assembly comprising a static iron core 2, a coil unit 3 provided above the static iron core 2, and a moving iron core 4 provided inside the coil unit 3;

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

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

[0063] The valve core 6 is disposed in the accommodating chamber 5.1 and is drivingly connected to the moving iron core 4;

[0064] The moving iron core 4 moves to drive 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;

[0065] The elastic diaphragm 7 has an inner end which is sealed to the valve core 6 and an outer end which is sealed to the valve seat 5.

[0066] The elastic diaphragm 7 can be deformed elastically so that the inner end moves along with the valve core 6 and always maintains a sealing effect.

[0067] When the coil unit 3 is energized, 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 and the flow channel 5.3 are cut off from each other, and the medium cannot pass through.

[0068] When the coil unit 3 is powered off, the reset assembly (a spring disposed 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 to the flow channel 5.3, and the medium can pass through;

[0069] The electromagnetic force of the coil unit 3 drives the valve core 6 to close or open the working port 5.2, which has the characteristics of fast response speed, rapid opening or closing of medium flow, and accurate control of the flow and pressure of the medium, and is suitable for occasions requiring accurate control.

[0070] The elastic diaphragm 7 between the valve seat 5 and the valve core 6 forms an effective seal between the valve core 6 and the valve seat 5 to prevent the medium in the accommodating chamber 5.1 from overflowing, while not affecting the normal communication between the working port 5.2, the accommodating chamber 5.1, and the flow channel 5.3.

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

[0072] Compared with the structure of traditional guide rings, it has the characteristics of better sealing performance, high operating reliability and long service life.

[0073] See also Figure 3-4 As shown, 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 the first T-shaped block 7.1 to fit with, and the valve seat 5 is provided with a second fitting groove for the second T-shaped block 7.2 to fit with.

[0075] After the above improvement, the inner end of the elastic diaphragm 7 is reliably connected to the valve core 6, and the outer end is reliably connected to the valve seat 5, so that the connection of the elastic diaphragm 7 is stable and the operation reliability of the device is high.

[0076] A connecting portion 8 extending upward is provided above the valve seat 5, and the connecting portion 8 is detachably connected to the bottom of the static iron core 2.

[0077] A flange 8.1 extending inward is formed on the inner side of the connecting portion 8, a limiting protrusion 8.11 extending upward is provided above the flange 8.1, and a first clamping groove 8.12 is formed between the inner side of the connecting portion 8 and the limiting protrusion 8.11;

[0078] The arrangement of the valve seat 5 is passed through the upper part of the accommodating chamber 5.1;

[0079] A matching hole 2.1 is provided below the static iron core 2 and is vertically opposite to the accommodating cavity 5.1;

[0080] A second slot 2.2 is provided below the static iron core 2 and is opposite to the first slot 8.12;

[0081] The second card slot 2.2 and the first card slot 8.12 are combined to form a first fitting slot.

[0082] After the above improvements, the valve seat 5 forms an integrated first slot 8.12 after molding, and the static iron core 2 forms an integrated second slot 2.2 after molding. After the static iron core 2 and the valve seat 5 are connected, the first slot 8.12 and the second slot 2.2 can be combined to form a first mating slot, which can be more compact in structure, conducive to overall miniaturization, and suitable for use in cars with cramped space.

[0083] The first clamping groove 8.12 and the second clamping groove 2.2 are respectively arranged 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 for the connecting portion 8 to be inserted into, and the outer wall of the connecting portion 8 is connected to the hole by an interference fit to ensure sealing performance.

[0085] See also Figure 2-4 As shown, the movable iron core 4 is connected to 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 to the valve core 6.

[0086] An extension portion extending outward is arranged on the circumference of the guide rod 5.4, and a third clamping groove is formed below the extension portion;

[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 is combined with the third clamping groove 5.42 to form a second fitting groove.

[0088] The moving iron core 4 is provided with an internal threaded hole which passes through from top to bottom, and the upper end of the guide rod 5.4 passes through the lower part of the internal threaded hole and is threadedly connected with the internal threaded hole;

[0089] The guide rod 5.4 is formed with a third groove 5.42 after molding, and the valve core 6 is formed with a fourth groove 6.2 after molding. After the guide rod 5.4 and the valve core 6 are assembled, the third groove 5.42 and the fourth groove 6.2 can be combined to form a second fitting groove, which can be more compact in structure. The elastic diaphragm 7 can be fixed by utilizing the connection structure formed by the parts themselves, which is conducive to the overall miniaturization and is suitable for use in cars with cramped space.

[0090] See also Figure 2-7 As shown, the coil unit 3 includes a coil frame 3.1 and a coil 3.2 wound in a wire slot outside the coil frame 3.1;

[0091] The inner side of the coil frame 3.1 is provided with a sliding hole 3.11 extending up and down.

[0092] 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;

[0093] There are several guide parts 3.111, which are arranged at intervals around the moving iron core 4.

[0094] The inner side of the guide portion 3.111 contacts the outer periphery of the moving iron core 4 and guides the moving iron core 4 when the moving iron core 4 moves up and down.

[0095] A metal magnetic isolation sleeve is required to be arranged inside the conventional coil frame 3.1, and the moving iron core 4 is placed in the sliding hole 3.11 of the metal magnetic isolation sleeve, and the metal magnetic isolation sleeve is used to guide the moving iron core 4;

[0096] The guide portion 3.111 provided in the sliding hole 3.11 of the coil frame 3.1 of the present application guides the up and down movement of the moving iron core 4, eliminates the metal magnetic isolation sleeve in the traditional structure, and integrates the guiding and positioning functions into the guide portion 3.111 of the coil frame 3.1 itself, replacing the function of the magnetic isolation sleeve, thereby reducing one part and lowering the cost.

[0097] The guide part 3.111 has vertical ribs and is integrally formed with the coil frame 3.1.

[0098] See also Figure 4-6 As shown, a coil 3.2 lead pin 3.12 is arranged above the coil frame 3.1;

[0099] The coil frame 3.1 is entirely covered with rubber 3.13 after winding, and the coil unit 3 formed after the entire covering with rubber 3.13 fits and is connected to the inner hole of the housing 1;

[0100] After the coil frame 3.1 is wound, the yoke iron is installed, and then the entire plastic injection molding is performed 3.13, and the installation plane and the connector housing 1 are injection molded.

[0101] The advantage of this process is that it reduces the mutual assembly of multiple parts and reduces the dimensional tolerance of individual parts, so that individual parts only retain the most basic functions, greatly reducing costs.

[0102] See also Figure 2-8 As shown, the upper end surface of the static iron core 2 is tightly pressed against the lower end surface of the coil frame 3.1, and the housing 1 is provided with a snap-fit ​​groove that snaps 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 to the bottom of the sliding hole 3.11;

[0104] The boss 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 above improvements, after the parts are connected, the connection between them is stable, making the device run reliably.

[0106] The guide hole 2.31 on the boss 2.3 is used to guide the guide rod 5.4. Compared with the traditional guide positioning structure, it has the characteristics of simple and compact structure, is conducive to overall miniaturization, and has low cost;

[0107] The guiding effect of the guide hole 2.31 on the guide rod 5.4 is combined with the guiding effect of the guide part 3.111 on the moving iron core 4, so that the movement of the valve core 6 is stable and smooth, and the operating reliability of the device is improved.

[0108] The guide rod 5.4 is a hollow structure, the valve core 6 is provided with a guide hole 6.1 penetrating up and down, the moving iron core 4 is provided with a through hole 4.1 penetrating up and down, a first gap 9 is formed between the adjacent guide part 3.111 and the moving iron core 4, and a second gap 10 is formed between the guide hole 2.31 and the guide rod 5.4;

[0109] 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 guide structure that communicates with the matching hole 2.1.

[0110] The guide hole 6.1 is an internal threaded hole, and the lower part of the guide rod 5.4 is provided with an external thread, which is threadedly connected with the internal threaded hole on the valve core 6.

[0111] 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 drainage structure connected to the matching hole 2.1, connecting the upper space of the elastic diaphragm 7 to the external atmosphere, ensuring the balance of internal and external pressures. The internal and external pressures act on both sides of an elastic diaphragm 7 respectively. The two ends of the elastic diaphragm 7 are squeezed and fixed, and the middle part isolates the internal and external channels, so that the elastic diaphragm 7 can be stably deformed and maintain a sealing effect.

[0112] See also Figure 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 portion 8.

[0113] A supporting washer 11 is fitted in the supporting groove 8.111. The supporting washer 11 is supported on the lower part of the elastic diaphragm 7, and the inner diameter of the supporting washer 11 is the same as the inner diameter of the matching hole 2.1.

[0114] After the valve seat 5 is formed, an integrated support groove 8.111 can be formed for assembling the support gasket 11, making the structure more compact and facilitating the miniaturization of the device.

[0115] The support washer 11 supports the lower outer side of the elastic diaphragm 7, and the bottom wall of the matching hole 2.1 supports the upper outer side of the support washer 11. The two supporting functions are combined to make the assembly of the elastic diaphragm 7 more stable.

[0116] In addition, the inner diameter of the support washer 11 is consistent with the inner diameter of the matching hole 2.1, so that the upper and lower leaking areas of the diaphragm are consistent, thereby making the upper and lower pressure areas uniform, ensuring that the diaphragm can effectively undergo elastic deformation and improving operational reliability.

[0117] A damping spring 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 is used to dampen and buffer 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, it has the characteristics of long service life and high operating reliability.

[0118] The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A solenoid valve, characterized in that: include: A housing (1), wherein an electromagnetic drive assembly is arranged on the housing (1), and the electromagnetic drive assembly comprises a static iron core (2), a coil unit (3) arranged above the static iron core (2), and a moving iron core (4) arranged inside the coil unit (3); A valve seat (5), the valve seat (5) being arranged below the static iron core (2), and the valve seat (5) being provided with a containing cavity (5.1), a working port (5.2), and a flow channel (5.3); The working port (5.2) is located below the accommodating chamber (5.1) and is in communication with the accommodating chamber (5.1); A valve core (6), wherein the valve core (6) is disposed in the accommodating chamber (5.1), and the valve core (6) is drivingly connected to the moving iron core (4); The movable iron core (4) moves to drive the valve core (6) to move up or down, so that the valve core (6) has a position to open or close the working port (5.2); An elastic diaphragm (7), wherein the inner end of the elastic diaphragm (7) is sealedly connected to the circumference of the valve core (6), and the outer end of the elastic diaphragm (7) is sealedly connected to the valve seat (5). The elastic diaphragm (7) can be deformed elastically so that the inner end moves along with the valve core (6) and always maintains a sealing effect.

2. A solenoid valve according to claim 1, characterized in that: 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); The valve core (6) is provided with a first fitting groove for the first T-shaped block (7.1) to fit into, and the valve seat (5) is provided with a second fitting groove for the second T-shaped block (7.2) to fit into.

3. A solenoid valve according to claim 2, characterized in that: A connecting portion (8) extending upward is provided above the valve seat (5), and the connecting portion (8) is detachably connected to the bottom of the static iron core (2). A flange (8.1) extending inward is formed on the inner side of the connecting portion (8), a limiting protrusion (8.11) extending upward is provided above the flange (8.1), and a first clamping groove (8.12) is formed between the inner side of the connecting portion (8) and the limiting protrusion (8.11); The valve seat (5) is arranged to pass through the top of the accommodating cavity (5.1); A matching hole (2.1) is provided below the static iron core (2) and is vertically opposite to the accommodating cavity (5.1); A second slot (2.2) opposite to the first slot (8.12) is also provided below the static iron core (2); The second card slot (2.2) and the first card slot (8.12) are combined to form the first fitting slot.

4. A solenoid valve according to claim 2, characterized in that: The movable iron core (4) is connected to a guide rod (5.4), the lower end of which is inserted into a matching hole (2.1) of the stationary iron core (2) and connected to the valve core (6). An extension portion (5.41) extending outward is arranged on the peripheral side of the guide rod (5.4), and a third clamping groove (5.42) is formed below the extension portion (5.41); The valve core (6) is provided with a fourth clamping groove (6.2) opposite to the third clamping groove (5.42), and the fourth clamping groove (6.2) and the third clamping groove (5.42) are combined to form the second fitting groove.

5. The solenoid valve according to claim 1, characterized in that: The coil unit (3) comprises a coil frame (3.1) and a coil (3.2) wound in a wire slot outside the coil frame (3.1); The inner side of the coil frame (3.1) is provided with a sliding hole (3.11) extending up and down. 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 parts (3.111) are in a plurality and are arranged at intervals around the moving iron core (4). The inner side of the guide portion (3.111) contacts the outer periphery of the moving iron core (4) and guides the moving iron core (4) when the moving iron core (4) moves up and down.

6. A solenoid valve according to claim 5, characterized in that: A coil (3.2) lead-out pin (3.12) is arranged above the coil frame (3.1); The coil frame (3.1) is entirely coated with rubber (3.13) after winding, and the coil unit (3) formed after the entire coating (3.13) is fitted and connected to the inner hole of the outer shell (1).

7. The solenoid valve according to claim 5, characterized in that: The upper end surface of the static iron core (2) is tightly pressed against the lower end surface of the coil frame (3.1), and the housing (1) is provided with a snap-fitting groove that snaps onto the outer side of the static iron core (2); 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 to the bottom of the sliding hole (3.11); The convex column (2.3) is provided with a guide hole (2.31), and the guide hole (2.31) allows the guide rod (5.4) to pass through and plays a guiding role for the guide rod (5.4).

8. A solenoid valve according to claim 7, characterized in that: The guide rod (5.4) is a hollow structure, the valve core (6) is provided with a flow guide hole (6.1) penetrating upward and downward, the movable iron core (4) is provided with a through hole (4.1) penetrating upward and downward, a first gap (9) is formed between adjacent guide parts (3.111) and the movable iron core (4), and 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 guide structure that communicates with the matching hole (2.1).

9. The solenoid valve according to claim 3, characterized in that: A supporting groove (8.111) is formed between the inner side of the limiting protrusion (8.11) and the inner side of the connecting portion (8). A support washer (11) is fitted and connected in 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 matching hole (2.1).

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

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