A solenoid valve with hard sealing structure

Abstract

The present invention relates to a solenoid valve with a hard seal structure, comprising a valve body with a fluid channel and a receiving chamber provided therein, and a valve assembly installed in the receiving chamber, wherein the fluid channel and the receiving chamber are connected; the valve assembly comprises a liquid inlet seat, a valve core matched with the liquid inlet seat for closing or opening the fluid channel, and a driving mechanism for driving the valve core to reciprocate; the liquid inlet seat is provided with a guide hole for allowing the lower end of the valve core to extend therein, the middle section of the liquid inlet seat is provided with a plurality of liquid inlet holes arranged along the circumference of the liquid inlet seat, the lower section of the liquid inlet seat is provided with a valve core fluid channel and a flow channel inclined surface located at the upper part of the valve core fluid channel for regulating the flow rate, and the valve core comprises a large diameter section, an inclined surface section, a small diameter section and a valve core end inclined surface from top to bottom. Compared with the prior art, the present invention adopts a hard seal assembly method, which is not easy to cause leakage and greatly increases the service life of the solenoid valve.

Description

Technical Field

[0001] The invention relates to a solenoid valve, in particular to a solenoid valve with a hard sealing structure. Background Art

[0002] Automobile air conditioning systems are prone to leakage, and their working refrigerant usually uses CO 2 However, CO 2 The critical pressure is high (Pc = 7.38MPa) and the critical temperature is low (Tc = 31.25℃). In order to achieve good comprehensive refrigeration performance, the refrigeration system using carbon dioxide as the refrigerant must work in the transcritical area, and the working pressure exceeds the critical pressure. Compared with the current automotive air-conditioning system, the working pressure is much higher. At present, the electronic expansion valve / electronic stop valve working in the high-pressure refrigeration system uses a large-size motor and adds a reducer to increase the driving force in order to smoothly drive the valve core movement under high pressure. This method has the disadvantages of complex structure, high energy consumption, and difficulty in miniaturization. On the other hand, the end of the valve core is designed to be needle-shaped, which reduces the cross-sectional area to reduce the force acting on the valve core. This method has the disadvantages of complex valve core processing and large nonlinear flow regulation area.

[0003] Patent CN 111188912 A discloses a solenoid valve, which has the advantages of easy valve core driving, miniaturized valve body, accurate and stable flow regulation, etc. However, there are still the following problems: the valve core seat and the liquid inlet seat of the patent are separately arranged, and leakage is prone to occur when the two are assembled, especially for the refrigerant medium of high-pressure CO 2 In addition, the valve core seat and the liquid inlet seat and the parts connected thereto are sealed with a rubber sealing ring, which is also prone to leakage and failure problems, resulting in a significant reduction in the service life of the valve. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems of difficult sealing and easy leakage in the above-mentioned prior art and to provide a solenoid valve with a hard sealing structure.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A solenoid valve with a hard seal structure comprises a valve body with a fluid channel and a receiving cavity inside and a valve assembly installed in the receiving cavity, wherein the fluid channel and the receiving cavity are connected.

[0007] The valve assembly includes a liquid inlet seat installed at the bottom of the accommodating chamber, a valve core matched with the liquid inlet seat for closing or opening the fluid channel, and a driving mechanism for driving the valve core to reciprocate;

[0008] The liquid inlet seat is provided with a guide hole allowing the lower end of the valve core to extend therein, the middle section of the liquid inlet seat is provided with a plurality of liquid inlet holes arranged along the circumference of the liquid inlet seat, the lower section of the liquid inlet seat is provided with a valve core fluid channel and a flow channel slope located at the upper part of the valve core fluid channel for adjusting the flow rate;

[0009] The valve core includes a large diameter section, a slope section, a small diameter section and a slope at the end of the valve core from top to bottom. The diameter of the small diameter section is smaller than the diameter of the valve core fluid channel, and the diameter of the large diameter section is larger than the diameter of the valve core fluid channel.

[0010] Furthermore, the liquid inlet seat is made of a hard material, and a lower protrusion is processed at the lower end of the liquid inlet seat. When axially pressed, the lower protrusion is embedded in the step surface of the valve body to achieve a hard sealing connection;

[0011] An arc protrusion is processed on the upper circumferential wall of the liquid inlet seat. During assembly, the arc protrusion squeezes the inner wall circumference of the accommodating cavity to achieve interference fit and fluid medium sealing.

[0012] Furthermore, the driving mechanism includes a screw rod and a driving element that drives the screw rod to rotate, an axial through hole is provided inside the valve core, and the screw rod and the axial through hole are connected by a thread, which converts the rotation of the screw rod into linear motion of the valve core; a pressure balance channel is provided on the screw rod and / or the valve core, and the fluid entering the valve body passes through the pressure balance channel to fill the cavity where the upper end face and the lower end face of the valve core are located.

[0013] Further, the accommodating cavity is a cylindrical cavity with a step structure inside, the driving mechanism also includes a rotor mounting seat matched and mounted on the step structure, and the driving element includes a rotor mounted on the rotor mounting seat and a stator sleeved on the outer circumference of the rotor and driving the rotor to rotate;

[0014] The rotor mounting seat is fixed to the valve body by threads, and is provided with a central step-shaped through hole for accommodating the valve core inside, a guide groove is provided in the central step-shaped through hole, and a guide boss is provided at the upper end of the valve core, and the guide boss is slidably connected with the guide groove;

[0015] A mounting seat protrusion is provided at the end of the rotor mounting seat. When the liquid inlet seat is axially pressed, the mounting seat protrusion is embedded in the step surface of the valve body to achieve a hard sealing connection.

[0016] Furthermore, an axial seal receiving chamber with a stepped hole structure is provided above the guide hole of the liquid inlet seat, and a sealing ring in contact with the valve core, an axial sealing O-ring sleeved on the outside of the sealing ring, and a transition plate provided on the upper part of the sealing ring and the axial sealing O-ring are provided in the axial seal receiving chamber; the rotor mounting seat squeezes the axial sealing O-ring through the transition plate.

[0017] Furthermore, a stator housing is provided outside the stator, and the stator housing is fixedly connected to the upper end surface of the valve body; a groove for placing an upper sealing ring is provided on the outer side wall of the rotor mounting seat, and the rotor mounting seat and the stator housing are dust-sealed by the upper sealing ring.

[0018] Furthermore, a platform surface (or channel groove) is processed on the threaded cylindrical surface of the screw rod, and the pressure balance channel is formed between the platform surface and the axial through hole of the valve core.

[0019] Furthermore, the accommodating cavity forms a sealed housing with a sealed space, the sealed housing cover is arranged outside the rotor, and the lower end is fixedly and sealedly connected to the rotor mounting seat through a stopper;

[0020] The rotor is limitedly mounted inside the sealed housing by an upper bearing and a lower bearing, the lower bearing is mounted on the step of the central step-shaped through hole of the rotor mounting seat, and the upper bearing is mounted in a bearing seat, which is circumferentially fitted on the inner wall of the sealed housing and the upper end of the bearing seat abuts against the inner surface of the sealed housing.

[0021] Furthermore, a plurality of accommodating cavities are provided on the same valve body, and a valve assembly is installed in each accommodating cavity.

[0022] Furthermore, the valve body is provided with a pressure relief channel connected with the fluid channel, and a pressure relief valve is installed at a port of the pressure relief channel.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] The present invention integrates the existing valve core seat and the liquid inlet seat into an integrated liquid inlet seat, which not only reduces one component and improves the assembly effect, but also can avoid the sealing problem when the valve core seat and the liquid inlet seat are assembled, and avoid the high-pressure coolant CO 2 Leakage; in addition, a protrusion structure is provided at the lower end of the liquid inlet seat and the lower end of the rotor mounting seat. When axially pressed, the protrusion is embedded in the step surface of the step hole of the valve body to achieve a hard seal connection. An arc protrusion is provided on the outer circumference of the liquid inlet seat. When assembled, the arc protrusion squeezes the inner wall circumference of the accommodating cavity to achieve an interference fit hard seal. This structure minimizes the number of rubber sealing rings used, thereby avoiding the problem of sealing failure of traditional rubber sealing rings and greatly increasing the service life of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a schematic diagram of the top view of the structure of the present invention;

[0027] Figure 3 for Figure 2 HH sectional view;

[0028] Figure 4 for Figure 3 JJ sectional view;

[0029] Figure 5 for Figure 4 A partial enlarged view of

[0030] Figure 6 It is a front view of the valve body in the present invention;

[0031] Figure 7 for Figure 6 MM section view;

[0032] Figure 8 A top view of the valve body of the present invention;

[0033] Fig. 9 for Figure 8 KK sectional view;

[0034] Fig.10 A top view of the valve core in the present invention;

[0035] Fig.11 for Figure 6 QQ section view;

[0036] Fig.12 It is a cross-sectional view of the liquid inlet seat in the main direction of the present invention;

[0037] Fig.13 A top view of the rotor mounting seat of the present invention;

[0038] Fig.14 for Fig.13 PP section view;

[0039] In the figure:

[0040] 1 is a valve body, 101 is a first accommodating chamber, 102 is a second accommodating chamber, 103 is a longitudinal channel, 104 is a first transverse channel, 105 is a second transverse channel, and 106 is a third transverse channel;

[0041] 3 is a liquid inlet seat, 301 is a liquid inlet hole, 302 is a circular arc protrusion, 303 is a guide hole, 304 is an axial seal receiving cavity, 305 is a flow channel slope, 306 is a valve core fluid channel, and 307 is a lower protrusion;

[0042] 4 is a rotor mounting seat, 401 is a central step-shaped through hole, 402 is a guide groove, and 403 is a mounting seat protrusion;

[0043] 5 is a valve core, 501 is a stepped hole, 502 is a fine pitch precision internal thread, 503 is a guide boss, 504 is an inclined surface at the end of the valve core, 505 is a small diameter section, 506 is an inclined surface section, and 507 is a large diameter section;

[0044] 6 is a screw rod, 7 is a rotor, 8 is a lower bearing, 9 is an upper bearing, 10 is a bearing seat, 11 is a sealing housing, 12 is a stator, 13 is a stator control board, 14 is a pressure relief valve, 18 is a sealing ring, 19 is an axial sealing O-ring, 20 is a transition plate, 22 is an upper sealing ring, and 23 is a stator housing. DETAILED DESCRIPTION

[0045] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0046] Example

[0047] A solenoid valve with a hard seal structure, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the valve assembly includes a valve body 1 and a liquid inlet seat 3, a rotor mounting seat 4, a valve core 5, a screw rod 6, a rotor 7, a lower bearing 8, an upper bearing 9, a bearing seat 10, a sealing housing 11, a stator 12, a stator control board 13, a pressure relief valve 14 and a stator housing 23.

[0048] like Figure 6 , Figure 7 , Figure 8 and Fig. 9As shown, the valve body 1 is provided with a first accommodating chamber 101, a second accommodating chamber 102, a longitudinal channel 103, a first transverse channel 104, a second transverse channel 105, and a third transverse channel 106; the first transverse channel 104 is connected with the longitudinal channel 103 inside the valve body 1, and the first accommodating chamber 101 and the second accommodating chamber 102 are connected with the longitudinal channel 103 through their respective vertical channels, and a pressure relief valve 14 is installed at the end of the longitudinal channel 103, and when the pressure in the longitudinal channel 103 exceeds the set value, the pressure relief valve 14 is opened to release the pressure; the second transverse channel 105 is connected with the first accommodating chamber 101; the third transverse channel 106 is connected with the second transverse channel 105 and the first transverse channel 104; The channel 106 is connected to the second accommodating chamber 102. The first transverse channel 104, the second transverse channel 105, the third transverse channel 106 and the longitudinal channel 103 constitute a fluid channel. The fluid can enter from the second transverse channel 105 and the third transverse channel 106, and flow out through the longitudinal channel 103 and the first transverse channel 104. It can also flow in from the first transverse channel 104 and flow out from the second transverse channel 105. It can also flow in from the second transverse channel 105 and flow out from the first transverse channel 104. The flow of fluid in the solenoid valve is bidirectional. The solenoid valve of this embodiment does not restrict the flow direction of the fluid. The accommodating chamber is cylindrical, with steps designed in the axial direction. Two sets of valve assemblies are installed in the two accommodating chambers respectively. The liquid inlet seat 3 and the rotor mounting seat 4 are installed in the accommodating chamber from bottom to top in sequence. The screw rod 6 and the valve core 5 are connected by threads. The rotation of the screw rod 6 is converted into the up and down linear motion of the valve core 5 through the threads. The valve core 5 and the liquid inlet seat 3 cooperate with each other to achieve flow regulation.

[0049] like Fig.10 and Fig.11 As shown, a through step hole 501 is opened at the center of the valve core 5, and the upper section of the step hole 501 is processed with a fine-pitch precision internal thread 502 engaged with the screw rod 6. The valve core 5 is provided with a guide boss 503, which is composed of a large diameter section 507, a slope section 506, a small diameter section 505 and a valve core end slope 504 provided on the bottom end face of the valve core 5 from top to bottom.

[0050] like Figure 4 As shown, the liquid inlet seat 3 is placed at the bottom of the accommodating chamber. Fig.12 As shown, the liquid inlet seat 3 is provided with a guide hole 303 allowing the lower end of the valve core 5 to extend therein, the middle section of the liquid inlet seat 3 is provided with a plurality of liquid inlet holes 301 arranged circumferentially along the liquid inlet seat 3, the lower section of the liquid inlet seat 3 is provided with a valve core fluid channel 306 and a flow channel slope 305 located on the upper part of the valve core fluid channel 306 for adjusting the flow rate, the liquid inlet seat 3 is made of hard material, and an arc protrusion 302 is machined on the upper circumferential wall of the liquid inlet seat. During assembly, the arc protrusion 302 squeezes the inner wall circumference of the accommodating cavity to achieve interference fit and fluid medium sealing; a lower protrusion 307 is machined on the lower end of the liquid inlet seat 3. When axially pressed, the lower protrusion 307 is embedded in the step surface of the valve body to achieve a hard sealing connection.

[0051] like Fig.11 The lower end surface of the valve core 5 is designed with a valve core end inclined surface 504 matching the flow channel inclined surface 305. In the large flow adjustment stage, the channel between the valve core end inclined surface 504 and the flow channel inclined surface 305 is the flow path of the refrigerant. By adjusting the upper and lower positions of the valve core 5, the cross-sectional area of ​​the flow path is linearly adjusted, and then the refrigerant flow is linearly adjusted. The size of the small diameter section 505 of the valve core 5 is slightly smaller than the aperture of the valve core fluid channel 306; the size of the large diameter section 507 is larger than the aperture of the valve core fluid channel 306. When the valve core drops to a certain extent, the inclined surface section 506 is in contact with the valve core fluid channel 306, thereby realizing the function of the stop valve. By adjusting the different positions of the valve core 5 in the liquid inlet seat 3, the same valve can cut off the flow of the refrigerant between the channels, that is, used as a stop valve, and can also realize the expansion of the refrigerant between the channels, that is, used as an expansion valve.

[0052] A plurality of liquid inlet holes 301 are provided in the circumferential direction at the lower part of the liquid inlet seat 3 to reduce the flow rate of the refrigerant, reduce the noise generated by the flow of the refrigerant, and prevent the refrigerant from directly impacting the valve core 5; a guide hole 303 for accommodating the valve core 5 is provided in the center of the liquid inlet seat 3 to realize the centering support for the up and down movement of the valve core 5. An axial sealing component receiving cavity 304 is provided on the upper end surface of the liquid inlet seat 3, such as Figure 5 The sealing ring 18, the axial sealing o-ring 19 and the transition plate 20 are placed in the axial sealing receiving cavity 304. The force transmitted from the rotor mounting seat 4 deforms the axial sealing o-ring 19 through the transition plate 20, and then squeezes the sealing ring 18 to closely fit the valve core 5 supported in the guide hole 303, ensuring the sealing of the valve core 5 when it moves up and down; the large diameter section 507 of the valve core 5 and the oil film of the guide hole 303 slide to ensure the linear movement of the valve core 5.

[0053] The rotor mounting seat 4 is mounted on the top of the liquid inlet seat 3 through the step in the accommodating cavity. Fig.13 and Fig.14 As shown, the rotor mounting seat 4 is provided with a slot for accommodating an O-ring, in which an upper sealing ring 22 is placed, and a mounting seat protrusion 403 is provided at the end of the rotor mounting seat 4. When axially compressed, the mounting seat protrusion 403 is embedded in the step surface of the accommodating cavity of the valve body 1 to achieve a hard sealing connection.

[0054] The rotor mounting seat 4 is fixedly connected to the valve body 1 by threads, and a central step-type through hole 401 and a rectangular guide groove 402 are opened in the center. The guide boss 503 of the valve core 5 cooperates with the guide groove 402 to limit the rotation of the valve core 5. Through the transmission of the threaded pair and the guidance of the guide boss 503, the rotational motion of the screw rod 6 is converted into the up and down motion of the valve core 5.

[0055] The screw rod 6 is fixedly connected to the rotor 7 by means of integrated casting or interference fit. The threaded cylindrical surface of the screw rod 6 is processed with a platform surface, and the outer circumference of the screw rod 6 is processed with fine-pitch precision external threads that mesh with fine-pitch precision internal threads 502. A pressure balance channel is formed between the platform surface of the screw rod 6 and the step hole 501 of the valve core 5. The pressure balance channel connects the cavity where the upper end face of the valve core 5 is located and the cavity where the lower end face is located. The refrigerant fills the cavity where the upper and lower end faces of the valve core 5 are located through the gap between the platform surface and the step hole 501. The upper and lower end faces are in the same pressure area of ​​the refrigerant. Therefore, the operation of the driving valve core 5 does not need to overcome the pressure of the refrigerant, and the valve core 5 can be driven to move quickly with a small force. Therefore, this valve can work in a refrigerant system of any pressure, especially in a high-pressure refrigerant system.

[0056] like Figure 4 As shown, the rotor 7 is composed of permanent magnet silicon steel sheets, contained in the inner cavity of the sealed housing 11, and supported by the upper bearing 9 and the lower bearing 8. Under the support and limit of the upper and lower bearings, the rotor is driven by the stator 12 to rotate around the axis, and the up and down movement of the rotor is eliminated. The upper bearing 9 is installed in the bearing seat 10, and the bearing seat 10 is circumferentially matched in the inner cavity of the sealed housing 11, and the upper end is against the bottom surface of the sealed housing 11. The sealed housing 11 is matched with the rotor mounting seat 4 through the stopper, and is fixedly connected to the rotor mounting seat 4 by laser welding. As shown Figure 1 and Figure 5 As shown, the stator 12 is sleeved on the outer periphery of the rotor shell 11 and fixedly connected to the upper end surface of the valve body 1 by bolts. The stator housing 23 is sleeved on the outside of the stator 12. The drive control board 13 is fixed in the stator housing 23 and connected to the stator coil by Pin crimping. It is powered by a connector and is equipped with control and drive circuits and chips to control the stator, thereby controlling the speed, angle and output torque of the rotor.

[0057] In this embodiment, two accommodating chambers and valve components are arranged on the same valve body 1, which reduces the connecting pipelines between valves and can realize multiple functional combinations to meet the requirements of automobile CO 2 The requirements for refrigerant regulation under different working conditions of air-conditioning systems.

[0058] The working principle of this embodiment is:

[0059] The initial state can be a full flow state (the channel cross-sectional area between the valve core end bevel 504 of the valve core 5 and the flow channel bevel 305 is larger than the cross-sectional area of ​​the valve core fluid channel 306). Under the control of the drive plate 13, the rotor 7 rotates, and the valve core 5 moves downward through the meshing transmission of the fine-tooth precision thread pair. The gap between the valve core end bevel 504 and the flow channel bevel 305 gradually decreases, and enters a large flow linear adjustment state. The refrigerant flow rate is linearly reduced through the first transverse channel 103 and the second transverse channel 105 (or the third transverse channel 106) (used as an electronic expansion valve). When the small diameter section 505 of the valve core 5 begins to extend into the valve core fluid channel 306, it enters a constant flow output under a small flow state. At this time, the flow cross-section is the constant gap area between the valve core fluid channel 306 and the small diameter section 505; the valve core 5 moves further downward, the bevel section 506 of the valve core 5 contacts the valve core fluid channel 306, and the refrigerant flow channel is completely shut off (used as an electronic stop valve). The rotor moves in the reverse direction, and the working state changes from the cut-off state, to the small flow constant output state, to the large flow linear adjustment state, and finally returns to the full flow state.

[0060] The present invention integrates the existing valve core seat and the liquid inlet seat into an integrated liquid inlet seat, which not only reduces one component and improves the assembly effect, but also can avoid the sealing problem when the valve core seat and the liquid inlet seat are assembled, and avoid the high-pressure coolant CO 2 Leakage; in addition, a protrusion structure is provided at the lower end of the liquid inlet seat 3 and the lower end of the rotor mounting seat 4. When axially pressed, the protrusion is embedded in the step surface of the step hole of the valve body to achieve a hard seal connection. An arc protrusion 302 is provided on the outer circumference of the liquid inlet seat. When assembled, the arc protrusion squeezes the inner wall circumference of the accommodating cavity to achieve an interference fit hard seal. This structure minimizes the number of rubber sealing rings used, thereby avoiding the problem of sealing failure of traditional rubber sealing rings and greatly increasing the service life of the solenoid valve. The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various deformations or modifications within the scope of the claims, which does not affect the essential content of the present invention.

Claims

1. A solenoid valve with a hard seal structure, comprising a valve body (1) having a fluid channel and a receiving chamber provided therein, and a valve assembly installed in the receiving chamber, wherein the fluid channel and the receiving chamber are connected, and characterized in that: The valve assembly comprises a liquid inlet seat (3) mounted on the bottom of the accommodating chamber, a valve core (5) cooperating with the liquid inlet seat (3) for closing or opening the fluid channel, and a driving mechanism for driving the valve core (5) to reciprocate; The liquid inlet seat (3) is provided with a guide hole (303) for allowing the lower end of the valve core (5) to extend therein, the middle section of the liquid inlet seat (3) is provided with a plurality of liquid inlet holes (301) arranged along the circumference of the liquid inlet seat (3), the lower section of the liquid inlet seat (3) is provided with a valve core fluid channel (306) and a flow channel inclined surface (305) located at the upper part of the valve core fluid channel (306) for adjusting the flow rate; The valve core (5) comprises, from top to bottom, a large diameter section (507), a slope section (506), a small diameter section (505) and a slope (504) at the end of the valve core, the diameter of the small diameter section (505) being smaller than the diameter of the valve core fluid channel (306), and the diameter of the large diameter section (507) being larger than the diameter of the valve core fluid channel (306); A lower protrusion (307) is processed at the lower end of the liquid inlet seat (3), and when axially pressed, the lower protrusion (307) is embedded in the step surface of the valve body to achieve a hard sealing connection; An arc protrusion (302) is machined on the upper circumferential wall of the liquid inlet seat (3), and during assembly, the arc protrusion presses the inner wall circumference of the accommodating cavity to achieve interference fit and fluid medium sealing; The driving mechanism comprises a screw rod (6) and a driving element for driving the screw rod (6) to rotate; an axial through hole is provided inside the valve core (5); the screw rod (6) and the axial through hole are connected via a thread, and the thread converts the rotation of the screw rod (6) into a linear motion of the valve core (5); a pressure balancing channel is provided on the screw rod (6) and / or the valve core (5); the fluid entering the valve body (1) passes through the pressure balancing channel and fills the cavity where the upper end surface and the lower end surface of the valve core (5) are located; The accommodating cavity is a cylindrical cavity with a step structure inside, the driving mechanism further comprises a rotor mounting seat (4) matched with and mounted on the step structure, and the driving element comprises a rotor (7) mounted on the rotor mounting seat (4) and a stator (12) sleeved on the outer circumference of the rotor (7) and driving the rotor to rotate; The rotor mounting seat (4) is fixed to the valve body (1) by means of threads, and is provided with a central step-shaped through hole (401) for accommodating the valve core (5) therein, a guide groove (402) is provided in the central step-shaped through hole (401), a guide boss (503) is provided at the upper end of the valve core (5), and the guide boss (503) is slidably connected to the guide groove (402); The end of the rotor mounting seat (4) is provided with a mounting seat protrusion (403), and when axially pressed, the mounting seat protrusion (403) is embedded in the step surface of the valve body (1) to achieve a hard sealing connection; This structure minimizes the number of rubber seals used and increases the service life of the solenoid valve; The valve body (1) is provided with a pressure relief channel which is in communication with the fluid channel, and a pressure relief valve (14) is installed at a port of the pressure relief channel.

2. The solenoid valve with a hard seal structure according to claim 1, characterized in that: An axial seal receiving chamber (304) with a stepped hole structure is provided above the guide hole (303) of the liquid inlet seat (3); a seal ring (18) in contact with the valve core (5), an axial seal O-ring (19) sleeved on the outside of the seal ring (18), and a transition plate (20) provided on the upper parts of the seal ring (18) and the axial seal O-ring (19) are provided in the axial seal receiving chamber (304); the rotor mounting seat (4) squeezes the axial seal O-ring (19) through the transition plate (20).

3. The solenoid valve with a hard seal structure according to claim 2, characterized in that: A stator housing (23) is provided outside the stator (12), and the stator housing (23) is fixedly connected to the upper end surface of the valve body (1); a notch for placing an upper sealing ring (22) is provided on the outer side wall of the rotor mounting seat (4), and the rotor mounting seat (4) and the stator housing (23) are dust-proof sealed by the upper sealing ring (22).

4. The solenoid valve with a hard seal structure according to claim 1, characterized in that: A platform surface is machined on the threaded cylindrical surface of the screw rod (6), and the pressure balance channel is formed between the platform surface and the axial through hole of the valve core (5).

5. The solenoid valve with a hard seal structure according to claim 2, characterized in that: The accommodating cavity forms a sealed housing (11) with a sealed space, the sealed housing (11) being arranged to cover the outside of the rotor (7), and the lower end of the sealed housing being fixedly and sealedly connected to the rotor mounting seat (4) via a stopper; The rotor (7) is mounted in a limited manner inside the sealing housing (11) via an upper bearing (9) and a lower bearing (8); the lower bearing (8) is mounted on a step of a central step-shaped through hole (401) of a rotor mounting seat (4); the upper bearing (9) is mounted in a bearing seat (10); the bearing seat (10) is circumferentially mounted on an inner wall of the sealing housing (11) and the upper end of the bearing seat (10) abuts against an inner surface of the sealing housing (11).

6. The solenoid valve with a hard seal structure according to claim 1, characterized in that: A plurality of accommodating chambers are provided on the same valve body (1), and a valve assembly is installed in each accommodating chamber.

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