A two-position three-way solenoid valve

Abstract

The application provides a two-position three-way electromagnetic valve, which comprises an electromagnet base and a valve shell, and the valve shell is divided into a main valve cavity and a secondary valve cavity; a valve core is arranged in the valve shell, the front end of the valve core is located in the main valve cavity, the rear end of the valve core passes through a partition piece and the secondary valve cavity and the bottom of the valve shell in sequence, and the rear end of the valve core is connected with an armature; the valve shell is provided with a product port A which can be closed or opened by the front end of the valve core and a product port T which can be communicated with or disconnected from the secondary valve cavity; the bottom of the valve shell is provided with a bottom cavity which can be communicated with or disconnected from the secondary valve cavity and the product port T; the valve shell is also provided with a product port P which is communicated with the main valve cavity and can be communicated with or disconnected from the product port A; the armature extends into the electromagnet base after passing through the valve shell, and the armature has a gap which is communicated with the product port A between the outside of the valve shell and the electromagnet base; and the valve core is a balanced valve core structure. The two-position three-way electromagnetic valve adopts the balanced valve core structure, and the medium force borne by the valve core is equal no matter the position of the valve core, that is, the force borne by the valve core is not affected by the medium pressure, so that the two-position three-way electromagnetic valve is suitable for various working pressure ranges.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a two-position three-way solenoid valve. Background Technology

[0002] A two-position three-way solenoid valve is a type of solenoid valve with one inlet and two outlets. It is commonly used in industrial automation control systems as a pneumatic or hydraulic control valve, capable of controlling fluid flow in three channels. The working principle of a two-position three-way solenoid valve is to use an electromagnetic coil or electromagnet to generate a magnetic field, attracting the valve core to move, thereby changing the connection mode of the internal channels of the valve body and achieving fluid control. When the two-position three-way solenoid valve is energized, the first outlet channel is open, and the second channel is closed. When the solenoid valve is de-energized, the second outlet channel is open, and the first channel is closed.

[0003] A patent application published on February 21, 2020, with publication number CN 110822128 A, discloses a two-position three-way solenoid valve, including a magnetic shielding tube, a fixed iron core inserted into the magnetic shielding tube, a pump body, a pump core disposed within the magnetic shielding tube and positioned between the fixed iron core and the pump body, and a winding coil. A pump core spring is provided between the pump core and the fixed iron core, and the energized winding coil can drive the pump core to compress the pump core spring. A first one-way valve is provided at the end of the pump core facing the pump body, and a second one-way valve is provided at the end of the pump body facing the pump core. The first one-way valve and / or the second one-way valve include a mounting plate and a diaphragm disposed on the mounting plate, wherein the diaphragm is configured as an umbrella-shaped structure. This patent invention reduces the space required for assembling the one-way valve in the two-position three-way solenoid valve. However, this patent is greatly affected by the medium pressure during operation, and the applicable working pressure range is relatively small.

[0004] A patent application published on February 1, 2012, with publication number CN102338231A, discloses a two-position three-way solenoid valve. It includes a housing and an electromagnetic coil assembly assembled within the housing. The housing is fitted with a valve body, which has a pressure oil inlet and a pressure oil outlet. A valve seat is axially mounted on the center of the valve body. A pressure chamber is provided within the valve body, containing a moving iron core and a steel ball. The pressure oil outlet communicates with the pressure chamber. A stationary iron core is located at the center of the electromagnetic coil assembly, and a pressure relief port is located at the center of this stationary iron core. A spring is positioned between the stationary iron core and the moving iron core. The steel ball is fixed to the center of the moving iron core and cooperates with the valve seat and pressure relief port axially mounted on the valve body. However, this patent is significantly affected by the medium pressure during operation, resulting in a limited applicable working pressure range. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a two-position three-way solenoid valve, which solves the problem that existing two-position three-way solenoid valves are greatly affected by the medium pressure and have a small applicable working pressure range. The valve core of this invention has a balanced structure, that is, the sealing area is equal everywhere. Therefore, the valve core is not affected by the medium pressure during the movement, thus it has a wide applicable pressure range.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0007] A two-position three-way solenoid valve includes an electromagnet base and a valve housing connected to the electromagnet base. A partition within the valve housing divides the interior into a main valve chamber and a secondary valve chamber. An axially movable valve core is located within the valve housing. The front end of the valve core is located within the main valve chamber, and the rear end passes sequentially through the partition, the secondary valve chamber, and the bottom of the valve housing. An armature that attracts the electromagnet base is connected to the rear end of the valve core. The valve housing has a product port A that can be closed or opened by the front end of the valve core and a product port T that can communicate with or disconnect from the secondary valve chamber. The bottom is provided with a bottom cavity that can connect the secondary valve chamber to the product port T or disconnect it from the secondary valve chamber, and the valve core passes through the bottom cavity; the diameter of the product port A is equal to the diameter of the main valve core located in the main valve chamber; the diameter of the secondary valve core located in the secondary valve chamber is equal to the inner diameter of the bottom cavity; the valve body is also provided with a product port P that communicates with the main valve chamber and can communicate with or disconnect from the product port A; the armature extends out of the valve body and into the electromagnet base, and there is a gap between the armature and the outside of the valve body and the electromagnet base that communicates with the product port A.

[0008] The two-position three-way solenoid valve of the present invention adopts a balanced valve core structure, so that the force of the medium on the valve core is equal regardless of the position of the valve core. That is, the force on the valve core is not affected by the medium pressure. Therefore, the two-position three-way solenoid valve is suitable for various working pressure ranges.

[0009] Furthermore, in order to achieve a balanced valve core by ensuring a clearance fit between the valve core and the bottom cavity, and by ensuring that the bottom cavity has the same diameter as the auxiliary valve core, the valve core also includes a third core. The auxiliary valve core passes through the third core, through the inlet of the bottom cavity and the bottom cavity, and is then connected to the armature. The diameter of the third core is smaller than the diameter of the auxiliary valve core, and both the inlet of the bottom cavity and the bottom cavity are clearance-fitted with the third core.

[0010] Furthermore, in order to allow product port A to be sealed or opened by the valve core while also communicating with the secondary valve chamber, the front end of the main valve core is provided with a main sealing head for closing or opening product port A; the main sealing head and the main valve core are provided with a valve core channel connecting product port A and the secondary valve chamber.

[0011] Furthermore, in order to enable product port T to be connected or disconnected from product port A through the transition of the secondary valve cavity, the secondary valve core is provided with a secondary sealing head for closing or opening the inlet of the bottom cavity so that the secondary valve cavity is connected or disconnected from product port T.

[0012] Furthermore, in order to better achieve a sealing fit between the main sealing head and the product port A, and a sealing fit between the secondary sealing head and the inlet of the bottom cavity, the main sealing head and / or the secondary sealing head respectively fit with the product port A and / or the inlet of the bottom cavity through protruding surfaces.

[0013] Furthermore, in order to facilitate the installation and connection of the valve core within the main valve chamber and the auxiliary valve chamber, the main valve core and the auxiliary valve core are detachably connected.

[0014] Furthermore, to facilitate the detachable connection and installation of the main valve core and the auxiliary valve core, the main valve core and the auxiliary valve core are connected by threads.

[0015] Furthermore, in order for one of the main valve core and the auxiliary valve core to pass through the separator and be threaded to the other, the auxiliary valve core is provided with an axial threaded hole, and the main valve core is provided with an external threaded end, which extends into the auxiliary valve cavity and is screwed to the threaded hole; or the main valve core is provided with an axial threaded hole, and the auxiliary valve core is provided with an external threaded end, which extends into the main valve cavity and is screwed to the threaded hole.

[0016] Furthermore, to facilitate the connection and installation of the third core and the armature, the third core and the armature are connected by threads.

[0017] Furthermore, in order to achieve the threaded connection between the third core and the armature, the front end of the armature is provided with a connecting section that extends axially and penetrates into the bottom of the valve body, and the connecting section is provided with an axial second threaded hole, and the third core is provided with a second external threaded end that is screwed into the second threaded hole; or the third core is provided with an axial second threaded hole, and the connecting section is provided with a second external threaded end that is screwed into the second threaded hole.

[0018] Furthermore, to facilitate the installation of the third core, the third core and the auxiliary valve core are an integral structure, and the third core is connected to the middle of the auxiliary sealing head.

[0019] Furthermore, to facilitate the connection and installation of internal components within the valve housing, the valve housing includes a valve seat and a valve body covering the outside of the valve seat, wherein the valve seat is the bottom of the valve housing; the valve seat is provided with a bottom through hole communicating with the bottom cavity and the product port T.

[0020] Furthermore, in order to limit and guide the movement of the valve core while separating the inner cavity of the valve housing, the separating element is a guide seat that is slidably sleeved on the outside of the valve core and sealed with the valve core. The end of the guide seat is sealed to the valve seat, and the outside is sealed to the valve body.

[0021] Furthermore, in order to achieve the attraction between the armature and the electromagnet base, and to ensure that the electromagnet base can be stably attracted to the armature, and to facilitate the connection between the electromagnet base and the valve body, the electromagnet base includes an attraction seat that can be attracted or disconnected from the armature, an electromagnet disposed on the attraction seat, and a flange. The attraction seat is connected to the valve body through the flange.

[0022] Furthermore, in order to ensure that the valve core automatically moves away from the electromagnet base when the electromagnet is not energized, a spring is provided between the attraction seat and the armature.

[0023] The beneficial effects of this invention are:

[0024] 1. The two-position three-way solenoid valve of the present invention adopts a balanced valve core structure, so that the force of the medium on the valve core is equal regardless of the position of the valve core. That is, the force on the valve core is not affected by the medium pressure. Therefore, the two-position three-way solenoid valve is suitable for various working pressure ranges.

[0025] 2. The two-position three-way solenoid valve of the present invention is not affected by the medium force due to the designed balanced valve core structure. Therefore, the valve diameter of the two-position three-way solenoid valve can be varied within a wide range, while the required electromagnetic force remains basically unchanged. Therefore, by changing the valve diameter, the product can be adapted to different flow requirements.

[0026] 3. This invention balances the valve core structure so that it is not affected by the medium force. When the two-position three-way solenoid valve is activated, it only needs to overcome the spring force and friction force, and the required electromagnetic force is small, thus greatly reducing the weight of the electromagnet.

[0027] 4. The present invention achieves force balance by ensuring that the main valve core has the same force-bearing diameter, that is, the diameter of the main valve core body is equal to the diameter of port A; and the auxiliary valve core has the same force-bearing diameter, that is, the outer diameter of the auxiliary valve core front end body is equal to the diameter of the valve seat inner cavity.

[0028] 5. The main sealing head and the auxiliary sealing head of this invention adopt a raised surface sealing structure, which has good sealing performance, is suitable for various working media, and can achieve zero leakage. This avoids the problem of poor sealing performance of traditional two-position three-way solenoid valves with slide valve structure when used in pneumatic systems.

[0029] 6. By adopting a split structure for the valve core, the present invention facilitates the assembly of the main valve core and the auxiliary valve core on the inner and outer sides of the guide seat, making assembly simple; and the guide seat also serves to separate the outer circumferential cavity of the valve core, making it easy to cooperate with the three valve ports to form a two-position three-way structure. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0032] Figure 2 This is a schematic diagram of the working state structure of the present invention. Figure 1 .

[0033] Figure 3 This is a schematic diagram of the working state structure of the present invention. Figure 2 .

[0034] In the diagram: 1-Electromagnet, 2-Armature, 3-Valve seat, 31-Bottom through hole, 32-Bottom cavity, 4-Guide seat, 5-Main valve core, 51-Main valve core axial through hole, 52-Radial through hole, 6-Valve body, 7-Secondary valve core, 71-Secondary sealing head, 8-Sealing ring, 9-Screw, 10-Gasket, 11-Spring, 12-Actuating seat, 13-Flange. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] like Figure 1 The two-position three-way solenoid valve of Embodiment 1 of the present invention includes an electromagnet base and a valve housing connected to the electromagnet base. An axially movable valve core is provided inside the valve housing. A partition within the valve housing axially divides the valve housing into a main valve chamber at the front and a secondary valve chamber at the rear. The front end of the valve core is located in the main valve chamber, and the rear end of the valve core passes sequentially through the partition, the secondary valve chamber, and the bottom of the valve housing. An armature 2 is connected to the rear end of the valve core, and the armature 2 can be attracted to an electromagnet 1 inside the electromagnet base. The attraction between the armature 2 and the electromagnet base drives the axial movement of the valve core. The valve housing includes a valve seat 3 and a valve body 6 covering the outside of the valve seat 3. The valve seat 3 is located between the valve body 6 and the electromagnet base, and the valve seat 3 is the bottom of the valve housing. A secondary valve chamber is formed between the partition and the valve seat 3, and a main valve chamber is formed between the partition and the portion of the valve body 6 away from the electromagnet base.

[0037] like Figure 2 and Figure 3 As shown, the valve body has a product port A at the end away from the electromagnet base, which can be closed or opened by the front end of the valve core. That is, product port A is located at the front end of the valve body 6, and this product port A is located at one end of the main valve chamber. On the side of the valve body near the electromagnet base, that is, near the secondary valve chamber, there is a product port T that can communicate with or disconnect from the secondary valve chamber. The bottom of the valve body, i.e., the valve seat 3, has a bottom cavity 32 that communicates with product port T, and the valve core passes through the bottom cavity 32. Under the axial movement of the valve core, the bottom cavity 32 can communicate with or disconnect from the secondary valve chamber, thereby realizing the communication or disconnection between the secondary valve chamber and product port T. Furthermore, the valve core has a valve core channel connecting product port A and the secondary valve chamber. Therefore, under the axial movement of the valve core, product port A can communicate or disconnect with product port T through the valve core channel, the secondary valve chamber, and the bottom cavity 32. The valve body is also provided with a product port P that communicates with the main valve cavity. In this embodiment, the product port P is located in the valve body 6 near the main valve cavity, and the product port P is located on one side of the main valve cavity to achieve constant communication with the main valve cavity.

[0038] Furthermore, such as Figures 1-3 As shown, the part of the valve core located in the main valve chamber is the main valve core 5, and the part of the valve core located in the auxiliary valve chamber is the auxiliary valve core 7.

[0039] Furthermore, such as Figures 1-3 As shown, armature 2 extends through the valve body (valve seat 3) and into the electromagnet seat. There is a gap between armature 2 and the outer side of the valve body and the electromagnet seat, which communicates with the product port A. In other words, there is a gap between armature 2 and the outer side of valve seat 3, and also a gap between armature 2 and the electromagnet seat. These two gaps are connected and always communicate with the product port A. Movement of valve seat 3 causes the gap to increase or decrease.

[0040] Furthermore, such as Figure 2 and Figure 3 As shown, the diameter of product port A is equal to the diameter of the main valve core 5; the diameter of the auxiliary valve core 7 is equal to the inner diameter of the bottom cavity 32, that is, the sealing area is equal everywhere. With the effect of the above-mentioned gap, the medium flows into the gap to achieve pressure balance, so that the valve core is a balanced structure. Therefore, the valve core is not affected by the medium pressure during the movement, so it has a wide applicable pressure range.

[0041] Example 2 differs from Example 1 in that, as Figures 1-3 As shown, the valve core also includes a third core. The rear end of the auxiliary valve core 7 passes through the inlet of the bottom cavity 32 and the bottom cavity 32 through the third core and is connected to the armature 2. The diameter of the third core is smaller than the diameter of the auxiliary valve core 7, and the inlet of the bottom cavity 32 and the bottom cavity 32 are both clearance-fitted with the third core, so that the medium can enter the product port T through the bottom cavity 32, and the diameter of the auxiliary valve core 7 is equal to the inner diameter of the bottom cavity 32.

[0042] Example 3 differs from Example 2 in that, in order to facilitate the connection and installation of the third core and the armature 2, the third core and the armature 2 are connected by a thread.

[0043] Specifically, in this embodiment, the front end of the armature 2 is provided with a connecting section that extends axially and penetrates into the bottom of the valve housing, i.e., the valve seat 3. The connecting section is sealed to the valve seat 3, and a sealing ring 8 is provided between the connecting section and the valve seat 3. The connecting section has an axial second threaded hole, and the third core has a second external threaded end that is screwed into the second threaded hole. In another embodiment, the third core has an axial second threaded hole, and the connecting section has a second external threaded end that is screwed into the second threaded hole.

[0044] Example 4 differs from Example 2 in that, as Figures 1-3 As shown, the main valve core 5 has a main sealing head at its front end for closing or opening the product port A; the main sealing head and the main valve core 5 have a valve core channel connecting the product port A and the secondary valve chamber, with the end of the valve core channel near the product port A directly facing the product port A. In this embodiment, the valve core channel includes a main valve core axial through hole 51 extending along the axial direction of the main valve core 5 and a radial through hole 52 arranged radially along the main valve core 5. The rear end of the main valve core 5 passes through the separator and extends into the secondary valve chamber to connect with the secondary valve core 7. The radial through hole 52 is provided on the portion of the main valve core 5 located within the secondary valve chamber, and the main valve core axial through hole 51 communicates with the radial through hole 52. This ensures that the product port A communicates with the secondary valve chamber regardless of whether the valve core moves. Furthermore, the auxiliary valve chamber and the third core are also provided with valve core channels that communicate with the valve core channels of the main sealing head. The armature 2 is provided with a medium channel that communicates with the medium channel in the third core, so that the medium can flow from the product port A through the valve core channel and the medium channel into the gap between the armature 2 and the outer side of the valve seat 3, forming a pressure balance.

[0045] Furthermore, such as Figures 1-3 As shown, the secondary valve core 7 is provided with a secondary sealing head 71 for closing or opening the inlet of the bottom cavity 32. When the valve core moves to the right, i.e., moves towards the electromagnet seat, the secondary sealing head 71 closes the inlet of the bottom cavity 32, thereby disconnecting the secondary valve cavity from the product port T, and thus disconnecting the product port A from the product port T. When the valve core moves to the left, i.e., moves away from the electromagnet seat, the secondary sealing head 71 opens the inlet of the bottom cavity 32, thereby connecting the secondary valve cavity with the product port T, and thus connecting the product port A with the product port T. The valve seat 3 is provided with a bottom through hole 31 connecting the bottom cavity 32 and the product port T, serving as a transitional connection.

[0046] Example 5 differs from Example 4 in that, for ease of installation, the third core and the secondary valve core 7 are integrated, and the third core is axially connected to the secondary sealing head on the side away from the secondary valve core 7, and coaxially connected to the middle of the secondary sealing head. The secondary sealing head faces the inlet of the bottom cavity 32 and can close and open the inlet of the bottom cavity 32 following the movement of the valve core.

[0047] Example 6 differs from Example 5 in that, as Figures 1-3 As shown, the main sealing head and / or the secondary sealing head 71 respectively engage with the product port A and / or the inlet of the bottom cavity 32 through protruding surfaces. In this embodiment, the main sealing head engages with the product port A through its protruding surface, and the secondary sealing head 71 also engages with the inlet of the bottom cavity 32 through its protruding surface, thereby improving the sealing performance.

[0048] Example 7 differs from Example 6 in that, as Figures 1-3 As shown, the main valve core 5 and the auxiliary valve core 7 are detachably connected.

[0049] Furthermore, to facilitate the detachable connection and installation of the main valve core and the auxiliary valve core, the main valve core 5 and the auxiliary valve core 7 are connected by threads.

[0050] Specifically, in this embodiment, to enable one of the main valve core and the auxiliary valve core to pass through the separator and connect to the other by a thread, the inner side of the front end of the auxiliary valve core 7 is provided with an axial threaded hole, and the rear end of the main valve core 5 is provided with an external threaded end, which extends into the auxiliary valve cavity and is screwed into the threaded hole. In another embodiment, the main valve core is provided with an axial threaded hole, and the auxiliary valve core is provided with an external threaded end, which extends into the main valve cavity and is screwed into the threaded hole; in this embodiment, the radial through hole 52 can be provided on the auxiliary valve core and located in the auxiliary valve cavity, and the auxiliary valve core is provided with an axial through hole connecting the radial through hole 52 and the axial through hole 51 of the main valve core for connecting the product port A and the auxiliary valve cavity.

[0051] Example 8 differs from Example 7 in that, as Figures 1-3 As shown, the separator is a guide seat 4 that is slidably sleeved on the outside of the valve core. The guide seat 4 covers the valve seat 3, meaning the rear end of the guide seat 4 is connected to the valve seat 3. The front end of the guide seat 4 is slidably engaged with the valve core, and the guide seat 4 and the valve core are sealed together, with a sealing ring 8 on the mating surface. The outer side of the guide seat 4 is sealed together with the valve body 6, and sealing rings 8 are provided on both sealing surfaces. In addition, both the valve seat 3 and the guide seat 4 have annular recesses near the product port T, forming annular gaps. The bottom through hole 31 communicates with the product port T through these annular gaps.

[0052] Example 9 differs from Example 2 in that, as Figures 1-3As shown, the electromagnet base includes a suction seat 12 that is attracted or disconnected from the armature 2, an electromagnet 1 disposed on the suction seat 12, and a flange 13. The suction seat 12 is connected to the valve body through the flange 13.

[0053] The armature 2 extends into the electromagnet base. The attraction seat 12 is positioned opposite the armature 2. An electromagnet 1 is located on the outer periphery of the attraction seat 12 facing the armature 2 for attracting the armature 2. The flange 13 is located between the attraction seat 12 and the valve body, and is connected to the attraction seat 12 by screws 9. The flange 13 is located on the outer periphery of the armature 2.

[0054] Furthermore, the suction seat 12 has a tapered recess at one end facing the armature 2, and the armature 2 has a tapered end that matches the tapered recess, so as to facilitate adsorption with the suction seat 12.

[0055] Furthermore, the center of the conical recess of the suction seat 12 is provided with a first short blind hole in the axial direction, and the corresponding position of the armature 2 is provided with a second short blind hole opposite to the first short blind hole. A spring 11 is provided in both short blind holes. The two ends of the spring 11 abut against the suction seat 12 and the armature 2, respectively. In addition, a washer 10 is provided between the spring 11 and the armature 2.

[0056] The working process of this invention is as follows:

[0057] When the two-position three-way solenoid valve is de-energized, the main valve core 5 and the auxiliary valve core 7 are naturally in the left position under the preload of the spring 11. The main valve core 5 is pressed against the sealing surface of the valve body 6, the main valve port is closed, and the product port P and product port A are disconnected. The product port A on the valve body 6 is connected to the product port T on the valve body 6 through the main valve core axial through hole 51, radial through hole 52, bottom cavity 32 and bottom through hole 31 in the main valve core 5.

[0058] When the two-position three-way solenoid valve is energized, under the electromagnetic force of electromagnet 1, the electromagnetic force overcomes the spring force of spring 11, and the main valve core 5 and the auxiliary valve core 7 move to the right and are in the right position, connecting product port P and product port A; the sealing surface of the auxiliary valve core 7 is pressed against the sealing surface of valve seat 3, that is, pressed against the inlet of bottom cavity 32, so that the through hole in the main valve core 5 is disconnected from bottom cavity 32, thereby disconnecting product port A and product port T, and the medium flows from product port P to product port A.

[0059] When the coil is de-energized, the electromagnetic force disappears, and the valve core resets under the combined force of the spring preload and the medium, restoring the product to its initial state.

[0060] In addition, such as Figure 2 As shown, when the valve cores, namely the main valve core 5, the auxiliary valve core 7, and the third core, are in the left position, under the action of the main valve chamber pressure P1, the valve core's force-bearing diameter d1 is equal to d2, meaning the diameter of the product port A is equal to the diameter of the main valve core 5, and the valve core is in force balance. Figure 3As shown, when the main valve core 5, the auxiliary valve core 7, and the third core are in the right position, due to the through hole of the valve core, the pressure on both sides of the valve core is P2, that is, the pressure in the gap between the armature 2 and the outer side of the valve seat 3 is equal to the pressure in the auxiliary valve cavity, and the force-bearing diameter d3 of the valve core is equal to d4, that is, the diameter of the auxiliary valve core 7 is equal to the inner diameter of the bottom cavity 32, and the valve core is in force balance.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions of some or all of the technical features thereof, within the spirit and principles of the present invention, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A two-position three-way solenoid valve, characterized in that, Includes an electromagnet base and a valve housing connected to the electromagnet base. The valve housing is provided with a partition to divide the valve housing into a main valve chamber and a secondary valve chamber. The valve housing is provided with an axially movable valve core. The front end of the valve core is located in the main valve chamber, and the rear end passes through the partition, the secondary valve chamber, and the bottom of the valve housing in sequence. The rear end of the valve core is connected to an armature (2) that attracts the electromagnet base. The valve housing is provided with a product port A that can be closed or opened by the front end of the valve core and a product port T that can communicate with or disconnect from the secondary valve chamber. The bottom of the valve housing is provided with a bottom cavity (32) that can connect the secondary valve chamber with the product port T or disconnect from the secondary valve chamber. The valve core passes through the bottom cavity (32). The diameter of the product port A is the same as that of the main valve core located in the main valve chamber. 5) The diameters are equal; the diameter of the auxiliary valve core (7) located in the auxiliary valve cavity is equal to the inner diameter of the bottom cavity (32); the valve body is also provided with a product port P that communicates with the main valve cavity and can communicate or disconnect from the product port A; the armature (2) extends into the electromagnet seat after passing through the valve body, and there is a gap between the armature (2) and the outer side of the valve body and the electromagnet seat that communicates with the product port A; and the gap is always in communication with the product port A; the medium flows into the gap to achieve pressure balance, so that the valve core is a balanced structure; the separator is a guide seat (4) that is slidably sleeved on the outer side of the valve core and sealed with the valve core, the end of the guide seat (4) is sealed to the valve seat (3), and the outer side is sealed to the valve body (6).

2. The two-position three-way solenoid valve according to claim 1, characterized in that, The valve core also includes a third core. The auxiliary valve core (7) passes through the inlet of the bottom cavity (32) and the bottom cavity (32) and is connected to the armature (2). The diameter of the third core is smaller than the diameter of the auxiliary valve core (7), and the inlet of the bottom cavity (32) and the bottom cavity (32) are both clearance-fitted with the third core.

3. The two-position three-way solenoid valve according to claim 2, characterized in that, The front end of the main valve core (5) is provided with a main sealing head for closing or opening the product port A; the main sealing head and the main valve core (5) are provided with a valve core channel connecting the product port A and the secondary valve chamber.

4. The two-position three-way solenoid valve according to claim 3, characterized in that, The secondary valve core (7) is provided with a secondary sealing head (71) for closing or opening the inlet of the bottom cavity (32) so that the secondary valve cavity is connected to or disconnected from the product port T.

5. The two-position three-way solenoid valve according to claim 4, characterized in that, The main sealing head and / or the secondary sealing head (71) respectively engage with the inlet of the product port A and / or the bottom cavity (32) through their raised surfaces.

6. The two-position three-way solenoid valve according to any one of claims 1 to 5, characterized in that, The main valve core (5) and the auxiliary valve core (7) are detachably connected.

7. The two-position three-way solenoid valve according to any one of claims 1 to 5, characterized in that, The valve housing includes a valve seat (3) and a valve body (6) covering the outside of the valve seat (3). The valve seat (3) is the bottom of the valve housing. The valve seat (3) is provided with a bottom through hole (31) that connects the bottom cavity (32) and the product port T.

8. The two-position three-way solenoid valve according to any one of claims 1 to 5, characterized in that, The electromagnet base includes a suction seat (12) that is attracted or disconnected from the armature (2), an electromagnet (1) disposed on the suction seat (12), and a flange (13). The suction seat (12) is connected to the valve body through the flange (13).

9. The two-position three-way solenoid valve according to claim 8, characterized in that, A spring (11) is provided between the suction seat (12) and the armature (2).

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