Fluid buffer type electromagnetic three-way valve

Abstract

The utility model discloses a fluid buffering type electromagnetic three-way valve, which belongs to the technical field of valves, and comprises a valve body, an electromagnetic driver, a valve seat arranged on the valve body, a valve core arranged on a valve rod, and a valve core arranged on the valve rod, the valve rod is connected with a movable iron core of the electromagnetic driver, a first sealing face and a second sealing face are arranged on the valve seat in the axis direction of the valve rod, and the electromagnetic driver comprises a static iron core and further comprises a reset spring. The medium cavity is formed between the movable iron core and the valve seat; a communicating hole is formed in the valve rod, and the medium cavity is communicated with the second outlet connecting pipe through the communicating hole. According to the structural design adopted in the scheme, in the reciprocating motion process of the valve rod, buffering is conducted through the reset spring in one direction, buffering is conducted through fluid in the other direction, and therefore the impact strength of related parts in the operation process is relieved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a fluid buffer type electromagnetic three-way valve. Background Art

[0002] A solenoid valve is a valve device based on electromagnetic drive. It is a basic automation device used to control fluids and is widely used. A solenoid valve is an actuator and is usually used in industrial control systems to adjust the direction, flow, speed or other parameters of the medium according to control instructions.

[0003] Usually, the solenoid valve includes an electromagnetic drive mechanism and a valve body, wherein the electromagnetic drive mechanism includes a housing, an electromagnetic coil installed in the housing, and an iron core assembly centrally arranged relative to the electromagnetic coil, wherein the iron core assembly includes an iron core and a valve stem, and the iron core includes a moving iron core and a static iron core. The valve body includes a valve body and a valve core arranged in the valve body, wherein the valve core is connected to the moving iron core through the valve stem. When the moving iron core moves under the electromagnetic force, the valve core is driven to move through the valve stem to change the way the valve body acts on the medium. At the same time, the solenoid valve is also configured with a reset spring located in the electromagnetic drive mechanism or the valve body. When the electromagnetic coil is powered off, the valve core performs a reset action relative to the valve body under the action of the reset spring. In summary, the solenoid valve uses electromagnetic force as a driving force, and controls the position of the valve core during operation to achieve the purpose of adjusting the direction, flow rate, speed or other parameters of the medium.

[0004] The existing common electromagnetic three-way valve includes a valve body and an electromagnetic drive mechanism, and the valve body has three valve ports. A specific structure is: the valve body has a valve seat, and the valve seat has two flow paths, the two flow paths are branches connected to the inlet pipe, and two valve seats are arranged at the branch positions, and also includes a valve core located between the valve seats, the valve core is fixed on the valve stem, and the valve stem is connected to the moving iron core of the electromagnetic driver. When the electromagnetic driver is energized, the moving iron core moves to make the valve core fit with one of the valve seats, at this time the inlet pipe is connected to one of the outlet pipes and disconnected from the other outlet pipe, when the electromagnetic driver is powered off, the moving iron core is reset under the action of the reset spring, and at this time the moving iron core moves to fit with the other valve seat, so as to achieve the purpose of switching the conduction relationship between the inlet pipe and different outlet pipes according to the power-on and power-off states of the electromagnetic driver.

[0005] Solenoid valves are used in various industrial fields as medium control devices. In order to ensure the performance of solenoid valves, it is necessary to further optimize the relevant structures of solenoid valves. Utility Model Content

[0006] In view of the problem of further optimizing the relevant structure of the solenoid valve proposed above, the present utility model provides a fluid buffer type electromagnetic three-way valve. The structural design adopted in this solution enables the valve stem to be buffered by a return spring in one direction and by fluid in the other direction during the reciprocating motion, so as to alleviate the impact intensity of relevant components during operation.

[0007] In view of the above problems, a fluid buffer type electromagnetic three-way valve provided by the present utility model solves the problems through the following technical points: A fluid buffer type electromagnetic three-way valve includes a valve body and an electromagnetic driver. The valve body is provided with an inlet connection pipe, a first outlet connection pipe, and a second outlet connection pipe. It also includes a valve seat arranged on the valve body. The valve seat is provided with flow channels for enabling the inlet connection pipe to be respectively communicated with the first outlet connection pipe and the second outlet connection pipe. It further includes a valve core arranged in the flow channels. The valve core is installed on a valve stem, and the valve stem is connected to the moving iron core of the electromagnetic driver. In the axial direction of the valve stem, on the valve seat on the side of the valve core close to the electromagnetic driver, there is a first sealing surface for cooperating with the valve core. After cooperation, the flow channel between the inlet connection pipe and the first outlet connection pipe is cut off. On the valve seat on the side of the valve core far from the electromagnetic driver, there is a second sealing surface for cooperating with the valve core. After cooperation, the flow channel between the inlet connection pipe and the second outlet connection pipe is cut off. The electromagnetic driver includes a static iron core, and also includes a return spring supported between the static iron core and the moving iron core. The return spring is used to provide a thrust for the moving iron core to move the moving iron core away from the static iron core.

[0008] It also includes a medium cavity formed between the moving iron core and the valve seat;

[0009] A communication hole is arranged on the valve stem, and the medium cavity is communicated with the second outlet connection pipe through the communication hole.

[0010] This solution is as follows: A first sealing surface and a second sealing surface are arranged on the valve seat. When the electromagnetic driver loses power, under the thrust of the return spring on the moving iron core, the valve core moves with the valve stem towards the second sealing surface and cooperates with the second sealing surface to form a sealing pair. At this time, the inlet connection pipe is communicated with the first outlet connection pipe and is in a cut-off relationship with the second outlet connection pipe; when the electromagnetic driver is powered on, the return spring is further compressed, and the moving iron core moves towards the side where the static iron core is located. During this process, the cooperation state between the valve core and the valve seat is switched to cooperate with the first sealing surface to form a sealing pair and separate from the second sealing surface. At this time, the inlet connection pipe is communicated with the second outlet connection pipe, and the inlet connection pipe is in a cut-off relationship with the first outlet connection pipe. That is, this solution controls the power on and off of the electromagnetic driver to change the cooperation position of the valve core on the valve seat, so as to achieve the purpose of switching the conduction relationship between the inlet connection pipe and different outlet connection pipes.

[0011] Different from the prior art, during the process of the electromagnetic actuator energizing and the spool moving towards the first sealing surface, the above-mentioned return spring can store energy to reduce the mutual impact between the spool and the first sealing surface during this process; during the process of the electromagnetic actuator de-energizing and the spool moving towards the second sealing surface, due to the existence of the medium cavity and the communication hole, during this process, the medium in the medium cavity is extruded through the communication hole, so the force of the medium in the medium cavity on the moving iron core can reduce the mutual impact between the spool and the second sealing surface during this process.

[0012] In summary, this solution provides a technical solution that enables the valve stem to be buffered by a return spring in one direction and by a fluid in the other direction during the reciprocating movement process, so as to alleviate the impact intensity generated by relevant components during the operation of the valve stem. When specifically applied, according to the specific fluid transportation requirements of the pipeline set by this three-way valve, the fluid can be a liquid or a gas.

[0013] As a further technical solution of the fluid-buffered electromagnetic three-way valve:

[0014] The valve body has a vertically arranged blind hole, the blind hole is a stepped hole, and the blind hole has a stepped surface facing the orifice of the blind hole;

[0015] The valve seat is supported on the stepped surface, and the valve seat is a laminated structure: in the axial direction of the blind hole, the valve seat is laminated by block structures, the second sealing surface is located on the first block structure directly supported on the stepped surface, and the first sealing surface is located on the second block structure supported on the first block structure;

[0016] The spool is located in the space between the first block structure and the second block structure, and the valve stem is coaxial with the blind hole.

[0017] The electromagnetic actuator is threadedly connected to the orifice side of the blind hole through the seat body at the lower end of the static iron core, and the lower end of the static iron core is in contact with one end of the valve seat away from the stepped surface;

[0018] The medium cavity is the space located inside the static iron core and between the moving iron core and the valve seat.

[0019] The above solution provides a specific form of the valve seat and the installation method of the valve seat on the valve body. As described above, according to the movement direction of the valve core, sealing surfaces are provided in all directions of the reciprocating movement of the valve core, so as to control the conduction state between the inlet pipe and different outlet pipes by changing the cooperation relationship between the relevant sealing surfaces and the valve core. Therefore, the valve core is located in a section of the channel of the valve seat, and the two ends of this section of the channel are the first sealing surface and the second sealing surface respectively. When the valve stem moves along its axis under the action of the moving iron core, the cooperation state with different sealing surfaces can be changed. Further, for the convenience of assembly, the valve seat is set as a laminated structure in this solution, so as to clamp the valve core in this section of the channel by successively installing each component, and use the blind hole as the installation space of the valve seat on the valve body, and support one end of the valve seat on the step surface to define the position of the valve seat on the valve body. Further, this solution uses the static iron core on the electromagnetic driver to provide a constraint for one end of the valve seat, so as to limit the valve seat between the static iron core and the step surface. In specific applications, since the medium cavity needs to perform the function of storing the medium, there is also a process of squeezing out the medium in the medium cavity during the movement of the moving iron core. To avoid medium leakage, a better application is to provide a fifth sealing ring between the static iron core and the blind hole, and the fifth sealing ring is used to achieve the axial sealing of the gap between the static iron core and the blind hole.

[0020] The laminated structure includes a first block structure, a second block structure and a third block structure laminated in sequence from bottom to top. The flow channel between the inlet pipe and the second outlet pipe passes through the hole in the first block structure, and the flow channel between the inlet pipe and the first outlet pipe passes through the hole in the second block structure;

[0021] A first sealing ring is provided between the first block structure and the blind hole;

[0022] A second sealing ring is provided between the second block structure and the blind hole;

[0023] A third sealing ring is provided between the third block structure and the blind hole;

[0024] A fourth sealing ring is provided between the valve stem and the valve seat, and the fourth sealing ring is clamped between the second block structure and the third block structure.

[0025] The above solution provides a more specific valve seat structure and a technical solution for facilitating the assembly of the valve seat and the valve core and setting the corresponding sealing rings. When the valve core and the valve stem are set as an integral non-detachable structure and the valve core is located at the lower end of the valve stem, the specific assembly sequence of the valve seat and the valve core can be as follows: First, from the upper end of the valve stem, a second block structure is sleeved on the valve stem, and after inserting the fourth sealing ring, the third block structure is installed. Then, the connection between the valve stem and the moving iron core is completed, and the formed assembly structure is placed into the blind hole provided with the first block structure. In this way, the valve core is limited within the space between the first block structure and the second block structure, and the fourth sealing ring that realizes the axial seal of the gap between the valve stem and the valve seat is clamped between the second block structure and the third block structure. The first sealing ring is used to realize the axial seal of the gap between the first block structure and the blind hole, the second sealing ring is used to realize the axial seal of the gap between the second block structure and the blind hole, and the third sealing ring is used to realize the axial seal of the gap between the third block structure and the blind hole. Regarding the above sealing rings, specifically, the first sealing ring is located between the valve core and the second outlet pipe, the second sealing ring is located between the valve core and the first outlet pipe, and the third sealing ring and the fourth sealing ring are both located between the first outlet pipe and the orifice of the blind hole.

[0026] The valve stem is coaxial with the moving iron core, and the valve stem is threadedly connected to the internal threaded hole on the moving iron core through the external thread at the end.

[0027] It also includes a lock nut threadedly connected to the valve stem, and the end of the lock nut abuts against the end face of the moving iron core.

[0028] The purpose of this solution is to provide a technical solution for facilitating the configuration of the position of the valve core on the valve seat: The connection relationship between the valve stem and the moving iron core can adjust the position of the valve core relative to the moving iron core by adjusting the length of the valve stem extending into the moving iron core, so that after the electromagnetic drive is installed, the valve core and the valve seat have a correct relative position configuration relationship. The above lock nut is used to prevent the valve stem from loosening. After the position of the valve core relative to the moving iron core is adjusted, by tightening the lock nut, it is avoided that the valve stem rotates relative to the moving iron core under vibration conditions, affecting the relative position matching accuracy between the valve core and the valve seat.

[0029] An elastic washer is also clamped between the end of the lock nut and the end face of the moving iron core.

[0030] This solution aims to provide a solution that is beneficial for maintaining the position of the valve core relative to the moving iron core. Specifically, although the elastic deformation generated by the connection thread between the valve stem and the moving iron core and the connection thread between the lock nut and the valve stem can prevent the valve stem from rotating relative to the moving iron core, considering the strength, impact resistance, magnetic conductivity, etc. of the materials, it is not suitable to set the moving iron core, valve stem, and lock nut as elastic materials with good elasticity. In this solution, it is further set to further include the elastic washer, aiming to utilize the elastic force generated by the elastic washer to maintain the locking performance of the lock nut on the valve stem for a long time. A preferred application is that the elastic washer is a metal spring washer.

[0031] The valve core includes a skeleton fixedly connected to the valve stem and a rubber layer wrapped outside the skeleton;

[0032] The mating surfaces of the valve core with the first sealing surface and the second sealing surface are both provided by the rubber layer.

[0033] This solution aims to provide a technical solution for maintaining the basic external shape of the valve core through the skeleton and maintaining the sealing reliability between the valve core and the first sealing surface and the second sealing surface through the mating surface provided by the rubber layer.

[0034] The electromagnetic driver further includes an electromagnetic coil sleeved outside the static iron core. A magnetic isolation sleeve is provided between the electromagnetic coil and the static iron core. The electromagnetic driver further includes a housing covering the electromagnetic coil. The static iron core is fixedly connected to the valve body. The housing is formed by a lower housing and an upper housing. The lower housing is supported on the valve body, the upper housing is supported on the lower housing, and a compression cap that is threadedly connected to the static iron core and supported on the upper housing is further provided.

[0035] This solution aims to provide a specific structure of the electromagnetic driver and the connection relationship between the electromagnetic driver and the valve body. Specifically: The magnetic isolation sleeve is used to constrain the magnetic circuit generated when the electromagnetic coil is energized. The static iron core, as the structure on the electromagnetic driver connected to the valve body, can be specifically connected such that the end of the static iron core presses against the valve seat to limit the valve seat between the step surface of the blind hole and the static iron core. The static iron core also serves as the mounting post for the electromagnetic coil and the housing at the same time. The positions of the electromagnetic coil and the housing on the axis of the static iron core are fixed through the support of the valve seat and the constraint of the compression cap. The structural form of the housing aims to provide a technical solution that is convenient for assembly. For example, after the lower housing is supported on the valve body, then the magnetic isolation sleeve and the electromagnetic coil are installed, and then the upper housing is buckled to complete the encapsulation of the electromagnetic coil, and then the upper housing is locked through the compression cap.

[0036] The utility model has the following beneficial effects:

[0037] This solution provides a technical solution that enables the valve stem to be buffered by a return spring in one direction and by fluid in the other direction during reciprocating motion, so as to alleviate the impact intensity generated by related components during the operation of the valve stem. Brief Description of the Drawings

[0038] Figure 1 It is a schematic perspective view of a specific embodiment of the electromagnetic drive type three-way valve described in this solution;

[0039] Figure 2 It is a side view of a specific embodiment of the electromagnetic drive type three-way valve described in this solution;

[0040] Figure 3 is Figure 2 The cross-sectional view obtained by cutting the structure shown along the A-A direction.

[0041] The reference numerals in the figure are respectively: 1, electromagnetic driver; 11, static iron core; 12, return spring; 13, moving iron core; 14, valve stem; 15, locking nut; 16, communication hole; 17, valve seat; 171, first block structure; 172, second block structure; 173, third block structure; 18, valve core; 19, medium cavity; 2, valve body; 3, first outlet connection pipe; 4, second outlet connection pipe; 5, inlet connection pipe. Detailed Description of the Specific Embodiment

[0042] The following further elaborates on the present utility model in conjunction with embodiments, but the present utility model is not limited to the following embodiments:

[0043] Embodiment 1:

[0044] As Figures 1 to 3As shown in the figure, a fluid buffer type electromagnetic three-way valve includes a valve body 2 and an electromagnetic driver 1. The valve body 2 is provided with an inlet connection pipe 5, a first outlet connection pipe 3, and a second outlet connection pipe 4. It also includes a valve seat 17 provided on the valve body 2. The valve seat 17 is provided with flow channels for enabling the inlet connection pipe 5 to communicate with the first outlet connection pipe 3 and the second outlet connection pipe 4 respectively. It further includes a valve core 18 disposed in the flow channels. The valve core 18 is mounted on a valve rod 14, and the valve rod 14 is connected to the moving iron core 13 of the electromagnetic driver 1. In the axial direction of the valve rod 14, on the valve seat 17 on the side of the valve core 18 close to the electromagnetic driver 1, there is a first sealing surface for cooperating with the valve core 18, and after cooperation, the flow channel between the inlet connection pipe 5 and the first outlet connection pipe 3 is cut off. On the valve seat 17 on the side of the valve core 18 away from the electromagnetic driver 1, there is a second sealing surface for cooperating with the valve core 18, and after cooperation, the flow channel between the inlet connection pipe 5 and the second outlet connection pipe 4 is cut off. The electromagnetic driver 1 includes a static iron core 11, and also includes a return spring 12 supported between the static iron core 11 and the moving iron core 13. The return spring 12 is used to provide a thrust for the moving iron core 13 to move the moving iron core 13 away from the static iron core 11;

[0045] It also includes a medium cavity 19 formed between the moving iron core 13 and the valve seat 17;

[0046] A communication hole 16 is provided on the valve rod 14, and the medium cavity 19 communicates with the second outlet connection pipe 4 through the communication hole 16.

[0047] This embodiment is as follows: A first sealing surface and a second sealing surface are provided on the valve seat 17. When the electromagnetic driver 1 loses power, under the thrust of the return spring 12 on the moving iron core 13, the valve core 18 moves along with the valve rod 14 towards the second sealing surface and cooperates with the second sealing surface to form a sealing pair. At this time, the inlet connection pipe 5 communicates with the first outlet connection pipe 3, and is in a cut-off relationship with the second outlet connection pipe 4; when the electromagnetic driver 1 is powered on, the return spring 12 is further compressed, and the moving iron core 13 moves towards the side where the static iron core 11 is located. During this process, the cooperation state between the valve core 18 and the valve seat 17 is switched to cooperate with the first sealing surface to form a sealing pair and separate from the second sealing surface. At this time, the inlet connection pipe 5 communicates with the second outlet connection pipe 4, and the inlet connection pipe 5 is in a cut-off relationship with the first outlet connection pipe 3( Figure 3 (the provided state), that is, in this embodiment, by controlling the power on and off of the electromagnetic driver 1, the cooperation position of the valve core 18 on the valve seat 17 is changed, so as to achieve the purpose of switching the conduction relationship between the inlet connection pipe 5 and different outlet connection pipes.

[0048] Different from the prior art, during the process that the spool 18 moves towards the first sealing surface when the electromagnetic actuator 1 is energized, the above-mentioned return spring 12 can reduce the mutual impact between the spool 18 and the first sealing surface by energy storage; during the process that the spool 18 moves towards the second sealing surface when the electromagnetic actuator 1 is de-energized, due to the existence of the medium chamber 19 and the communication hole 16, during this process, the medium in the medium chamber 19 is extruded through the communication hole 16, so the force of the medium in the medium chamber 19 on the moving iron core 13 can reduce the mutual impact between the spool 18 and the second sealing surface.

[0049] In summary, this embodiment provides a technical solution that enables the valve stem 14 to be buffered by the return spring 12 in one direction and buffered by the fluid in the other direction during the reciprocating movement process, so as to relieve the impact intensity generated by the relevant components during the operation of the valve stem 14.

[0050] Embodiment 2:

[0051] This embodiment is further refined on the basis of Embodiment 1:

[0052] The valve body 2 is provided with a vertically arranged blind hole, the blind hole is a stepped hole, and the blind hole has a stepped surface facing the blind hole orifice;

[0053] The valve seat 17 is supported on the stepped surface, and the valve seat 17 is a laminated structure: in the axial direction of the blind hole, the valve seat 17 is formed by laminating block structures. The second sealing surface is located on the first block structure 171 directly supported on the stepped surface, and the first sealing surface is located on the second block structure 172 supported on the first block structure 171;

[0054] The spool 18 is located in the space between the first block structure 171 and the second block structure 172, and the valve stem 14 is coaxial with the blind hole.

[0055] The electromagnetic actuator 1 is threadedly connected to the orifice side of the blind hole through the seat body at the lower end of the static iron core 11, and the lower end of the static iron core 11 is in contact with one end of the valve seat 17 away from the stepped surface;

[0056] The medium chamber 19 is the space located inside the static iron core 11 and between the moving iron core 13 and the valve seat 17.

[0057] The above scheme provides a specific form of valve seat 17 and a method of installing the valve seat 17 on the valve body 2. As described above, according to the movement direction of the valve core 18, a sealing surface is provided in each direction of the reciprocating movement of the valve core 18, so as to control the conduction state between the inlet pipe 5 and different outlet pipes by changing the matching relationship between the relevant sealing surface and the valve core 18. Therefore, the valve core 18 is located in a section of the channel of the valve seat 17, and the two ends of the section of the channel are respectively a first sealing surface and a second sealing surface. When the valve stem 14 moves along its axis under the action of the moving iron core 13, the matching state with different sealing surfaces can be changed. Furthermore, for the convenience of assembly, in this embodiment, the valve seat 17 is set to a stacked structure, so that by installing each component in sequence, the valve core 18 is clamped in the section of the channel, and the blind hole is used as the installation space of the valve seat 17 on the valve body 2, and one end of the valve seat 17 is supported on the step surface to limit the position of the valve seat 17 on the valve body 2. Furthermore, in this embodiment, the static iron core 11 on the electromagnetic driver 1 is used to provide a constraint for one end of the valve seat 17, so as to limit the valve seat 17 between the static iron core 11 and the step surface. In specific applications, since the medium cavity 19 needs to play a medium storage function, there is also a process in which the medium in the medium cavity 19 is squeezed out during the movement of the moving iron core 13. To avoid medium leakage, a better application is to set a fifth sealing ring between the static iron core 11 and the blind hole, and the fifth sealing ring is used to achieve axial sealing of the gap between the static iron core 11 and the blind hole.

[0058] The stacked structure includes a first block structure 171, a second block structure 172 and a third block structure 173 stacked in sequence from bottom to top, the flow channel between the inlet pipe 5 and the second outlet pipe 4 passes through the hole on the first block structure 171, and the flow channel between the inlet pipe 5 and the first outlet pipe 3 passes through the hole on the second block structure 172;

[0059] A first sealing ring is provided between the first block structure 171 and the blind hole;

[0060] A second sealing ring is provided between the second block structure 172 and the blind hole;

[0061] A third sealing ring is provided between the third block structure 173 and the blind hole;

[0062] A fourth sealing ring is provided between the valve stem 14 and the valve seat 17 , and the fourth sealing ring is clamped between the second block structure 172 and the third block structure 173 .

[0063] The above solution provides a more specific structure of the valve seat 17 and a technical solution for facilitating the assembly of the valve seat 17 and the valve core 18 and setting the corresponding sealing rings. When the valve core 18 and the valve stem 14 are set as an integral non-detachable structure and the valve core 18 is located at the lower end of the valve stem 14, the specific assembly sequence of the valve seat 17 and the valve core 18 can be as follows: First, from the upper end of the valve stem 14, a second block structure 172 is sleeved on the valve stem 14, and after inserting the fourth sealing ring, the third block structure 173 is installed. Then, the connection between the valve stem 14 and the moving iron core 13 is completed, and the formed assembly structure is placed into the blind hole provided with the first block structure 171. In this way, the valve core 18 is limited within the space between the first block structure 171 and the second block structure 172, and the fourth sealing ring for realizing the axial sealing of the gap between the valve stem 14 and the valve seat 17 is clamped between the second block structure 172 and the third block structure 173. The first sealing ring is used to realize the axial sealing of the gap between the first block structure 171 and the blind hole, the second sealing ring is used to realize the axial sealing of the gap between the second block structure 172 and the blind hole, and the third sealing ring is used to realize the axial sealing of the gap between the third block structure 173 and the blind hole. Regarding the above sealing rings, specifically, the first sealing ring is located between the valve core 18 and the second outlet pipe 4, the second sealing ring is located between the valve core 18 and the first outlet pipe 3, and the third sealing ring and the fourth sealing ring are both located between the first outlet pipe 3 and the orifice of the blind hole.

[0064] Embodiment 3:

[0065] This embodiment is further refined on the basis of Embodiment 1:

[0066] The valve stem 14 and the moving iron core 13 are coaxial, and the valve stem 14 is threadedly connected to the internal threaded hole on the moving iron core 13 through the external thread at the end;

[0067] It further includes a lock nut 15 threadedly connected to the valve stem 14, and the end of the lock nut 15 is in mutual extrusion with the end face of the moving iron core 13.

[0068] The purpose of this embodiment is to provide a technical solution for facilitating the configuration of the position of the valve core 18 on the valve seat 17: The connection relationship between the valve stem 14 and the moving iron core 13 can adjust the position of the valve core 18 relative to the moving iron core 13 by adjusting the length of the valve stem 14 extending into the moving iron core 13, so that after the electromagnetic driver 1 is installed, the valve core 18 and the valve seat 17 have a correct relative position configuration relationship. The above lock nut 15 is used to prevent the valve stem 14 from loosening. After the position of the valve core 18 relative to the moving iron core 13 is adjusted, by tightening the lock nut 15, it is avoided that the valve stem 14 rotates relative to the moving iron core 13 under vibration conditions, affecting the relative position matching accuracy between the valve core 18 and the valve seat 17.

[0069] An elastic washer is also clamped between the end of the lock nut 15 and the end face of the moving iron core 13.

[0070] This embodiment aims to provide a solution that is beneficial to maintaining the position of the valve core 18 relative to the moving iron core 13. Specifically, although the elastic deformation generated by the connection thread between the valve stem 14 and the moving iron core 13 and the connection thread between the lock nut 15 and the valve stem 14 can prevent the valve stem 14 from rotating relative to the moving iron core 13, considering the strength, impact resistance, magnetic conductivity, etc. of the materials, it is not suitable to set the moving iron core 13, the valve stem 14, and the lock nut 15 as elastic materials with good elasticity. In this embodiment, it is further set to further include the elastic washer, aiming to utilize the elastic force generated by the elastic washer to maintain the locking performance of the lock nut 15 on the valve stem 14 for a long time. A better application is that the elastic washer is a metal spring washer.

[0071] Embodiment 4:

[0072] This embodiment is further refined on the basis of Embodiment 1:

[0073] The valve core 18 includes a skeleton fixedly connected to the valve stem 14 and a rubber layer wrapped around the outside of the skeleton;

[0074] The mating surfaces of the valve core 18 with the first sealing surface and the second sealing surface are both provided by the rubber layer.

[0075] This embodiment aims to provide a technical solution that maintains the basic external shape of the valve core 18 through the skeleton and maintains the sealing reliability between the valve core 18 and the first sealing surface and the second sealing surface through the mating surfaces provided by the rubber layer.

[0076] Embodiment 5:

[0077] This embodiment is further refined on the basis of Embodiment 1:

[0078] The electromagnetic drive 1 further includes an electromagnetic coil sleeved outside the static iron core 11. A magnetic isolation sleeve is provided between the electromagnetic coil and the static iron core 11. The electromagnetic drive 1 further includes a housing covering the electromagnetic coil. The static iron core 11 is fixedly connected to the valve body 2. The housing is formed by a lower housing and an upper housing. The lower housing is supported on the valve body 2, the upper housing is supported on the lower housing, and a compression cap supported on the upper housing is also threadedly connected to the static iron core 11.

[0079] This embodiment aims to provide a specific structure of the electromagnetic driver 1 and the connection relationship between the electromagnetic driver 1 and the valve body 2. Specifically: The magnetic isolation sleeve is used to constrain the magnetic circuit generated when the electromagnetic coil is energized. The static iron core 11, as the structure on the electromagnetic driver 1 connected to the valve body 2, can be specifically connected such that the end of the static iron core 11 presses against the valve seat 17 to limit the valve seat 17 between the step surface of the blind hole and the static iron core 11. The static iron core 11 also serves as the mounting post for the electromagnetic coil and the outer shell. The positions of the electromagnetic coil and the outer shell on the axis of the static iron core 11 are fixed through the support of the valve seat 17 and the constraint of the compression cap. The structural form of the outer shell aims to provide a technical solution convenient for assembly. For example, after installing the lower shell to support on the valve body 2, then install the magnetic isolation sleeve and the electromagnetic coil, then fasten the upper shell to complete the encapsulation of the electromagnetic coil, and then lock the upper shell through the compression cap.

[0080] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific embodiments of the present utility model are only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, other embodiments obtained without departing from the technical solution of the present utility model should all be included within the protection scope of the present utility model.

Claims

1. A fluid-buffered electromagnetic three-way valve, comprising a valve body (2) and an electromagnetic driver (1), wherein the valve body (2) is provided with an inlet pipe (5), a first outlet pipe (3) and a second outlet pipe (4), and further comprising a valve seat (17) arranged on the valve body (2), wherein the valve seat (17) is provided with a flow channel for achieving conduction between the inlet pipe (5) and the first outlet pipe (3) and the second outlet pipe (4), respectively, and further comprising a valve core (18) arranged in the flow channel, wherein the valve core (18) is mounted on a valve stem (14), and the valve stem (14) and a moving iron of the electromagnetic driver (1) are connected. The electromagnetic driver (1) is connected to a core (13), and in the axial direction of the valve stem (14), a valve seat (17) on the side of the valve core (18) close to the electromagnetic driver (1) has a first sealing surface for cooperating with the valve core (18) and cutting off the flow passage between the inlet pipe (5) and the first outlet pipe (3) after cooperating, and a valve seat (17) on the side of the valve core (18) away from the electromagnetic driver (1) has a second sealing surface for cooperating with the valve core (18) and cutting off the flow passage between the inlet pipe (5) and the second outlet pipe (4) after cooperating, the electromagnetic driver (1) comprising a static iron core (11), characterized in that: It also includes a return spring (12) supported between the stationary iron core (11) and the moving iron core (13), wherein the return spring (12) is used to provide the moving iron core (13) with a thrust to move the moving iron core (13) away from the stationary iron core (11); It also includes a medium chamber (19) formed between the moving iron core (13) and the valve seat (17); The valve stem (14) is provided with a communication hole (16), and the medium chamber (19) is connected to the second outlet pipe (4) through the communication hole (16).

2. A fluid buffer type electromagnetic three-way valve according to claim 1, characterized in that: The valve body (2) is provided with a vertically arranged blind hole, the blind hole being a stepped hole, and the blind hole is provided with a stepped surface facing the blind hole opening; The valve seat (17) is supported on the step surface, and the valve seat (17) is a stacked structure: in the axial direction of the blind hole, the valve seat (17) is formed by stacking block structures, the second sealing surface is located on the first block structure (171) directly supported on the step surface, and the first sealing surface is located on the second block structure (172) supported on the first block structure (171); The valve core (18) is located in the space between the first block structure (171) and the second block structure (172), and the valve stem (14) is coaxial with the blind hole.

3. A fluid buffer type electromagnetic three-way valve according to claim 2, characterized in that: The electromagnetic driver (1) is threadedly connected to the orifice side of the blind hole through the seat body at the lower end of the static iron core (11), and the lower end of the static iron core (11) is in contact with the end of the valve seat (17) away from the step surface; The medium cavity (19) is a space located inside the static iron core (11) and between the moving iron core (13) and the valve seat (17).

4. A fluid buffer type electromagnetic three-way valve according to claim 2, characterized in that: The stacked structure comprises a first block structure (171), a second block structure (172) and a third block structure (173) stacked in sequence from bottom to top, the flow channel between the inlet pipe (5) and the second outlet pipe (4) passes through a hole on the first block structure (171), and the flow channel between the inlet pipe (5) and the first outlet pipe (3) passes through a hole on the second block structure (172); A first sealing ring is arranged between the first block structure (171) and the blind hole; A second sealing ring is arranged between the second block structure (172) and the blind hole; A third sealing ring is arranged between the third block structure (173) and the blind hole; A fourth sealing ring is provided between the valve stem (14) and the valve seat (17), and the fourth sealing ring is clamped between the second block structure (172) and the third block structure (173).

5. A fluid buffer type electromagnetic three-way valve according to claim 1, characterized in that: The valve stem (14) is coaxial with the moving iron core (13), and the valve stem (14) is threadedly connected to the internal threaded hole on the moving iron core (13) through the external thread at the end thereof; It also includes a locking nut (15) threadedly connected to the valve stem (14), and the end of the locking nut (15) and the end surface of the moving iron core (13) are pressed against each other.

6. A fluid buffer type electromagnetic three-way valve according to claim 5, characterized in that: An elastic washer is also clamped between the end of the locking nut (15) and the end surface of the moving iron core (13).

7. A fluid buffer type electromagnetic three-way valve according to claim 1, characterized in that: The valve core (18) comprises a frame fixedly connected to the valve stem (14) and a rubber layer wrapped around the outside of the frame; The matching surfaces of the valve core (18) and the first sealing surface and the second sealing surface are all provided by the rubber layer.

8. A fluid buffer type electromagnetic three-way valve according to any one of claims 1 to 7, characterized in that: The electromagnetic driver (1) also includes an electromagnetic coil sleeved on the outside of the static iron core (11), and a magnetic isolation sleeve is arranged between the electromagnetic coil and the static iron core (11). The electromagnetic driver (1) also includes a shell covering the electromagnetic coil. The static iron core (11) is fixedly connected to the valve body (2), and the shell is surrounded by a lower shell and an upper shell. The lower shell is supported on the valve body (2), and the upper shell is supported on the lower shell. The static iron core (11) is also threadedly connected to a pressure cap supported on the upper shell.

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