A solenoid valve structure

Abstract

The present invention discloses a solenoid valve structure, including a valve body with a valve cavity, and a valve stem; the valve body is provided with a first working hole, a second working hole, a third working hole and a fourth working hole, and a first working port, a second working port, a third working port and a fourth working port are formed on the valve cavity; the valve stem is provided with a connecting piece, and the connecting piece is provided with a connecting channel and forms a first opening and a second opening; the connecting piece is provided with two ends of the first opening and the second opening and is sealed with the valve cavity; the first working port and the second working port are located on the valve cavity facing the first opening, and the third working port is located on the valve cavity facing the second opening; the fourth working port is located on the valve cavity facing neither the first opening nor the second opening; the connecting channel is connected with the third working port; when the valve stem is located at the first working position, the second working port is connected with the connecting channel; when the valve stem is located at the second working position, the first working port is connected with the connecting channel. The present invention can realize the function of a two-position four-way valve and has a simple structure.

Description

Technical Field

[0001] The invention relates to a solenoid valve structure, in particular to a two-position four-way solenoid valve structure. Background Art

[0002] General valves are generally two-position two-way and two-position three-way. In some complex pipelines, multiple valve combinations are often required to control the flow of fluids, which undoubtedly increases the difficulty of pipeline installation and the cost of use is also higher. The combined application of multiple valves also increases the failure rate. For two-position multi-way valves, in the current market, I often see pneumatic reversing valves and hydraulic reversing valves. For this type of valve, its application medium is specific. Pneumatic valves can only be used for compressed air, and hydraulic valves can only be used for hydraulic oil. This also limits this type of valve to specific working occasions. In actual pipeline control, water and compressed air are the most common media. Therefore, a two-position multi-way valve that is universal for water and gas is more meaningful in practical applications.

[0003] The two-position multi-way valves that we see most often are often of the sliding valve type, which controls multiple passages through the movement of a valve stem. This structure is relatively complex and requires high precision of components, while the flow coefficient is also relatively low. Summary of the invention

[0004] In order to overcome the deficiencies in the prior art, the present invention provides a solenoid valve structure which can realize the function of a two-position four-way valve and has a simple structure.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A solenoid valve structure comprises a valve body having a valve cavity inside, a valve stem movably arranged in the valve cavity, and an electromagnetic drive device arranged on the valve body for driving the valve stem to move;

[0007] The valve body is provided with a first working hole, a second working hole, a third working hole and a fourth working hole connected to the valve cavity, and the first working hole, the second working hole, the third working hole and the fourth working hole respectively form a first working port, a second working port, a third working port and a fourth working port on the inner wall of the valve cavity;

[0008] One end of the valve stem is provided with a connecting piece, and the connecting piece is provided with a connecting passage penetrating the connecting piece and forming a first opening and a second opening; both ends of the connecting piece provided with the first opening and the second opening are sealed and matched with the inner wall of the valve cavity;

[0009] The first working port and the second working port are located on the inner wall of the valve cavity facing the first opening and are distributed along the moving direction of the valve stem; the third working port is located on the inner wall of the valve cavity facing the second opening; the fourth working port is located on the inner wall of the valve cavity not facing the first opening and the second opening;

[0010] The communication channel is always connected to the third working port;

[0011] When the valve stem is located at the first working position, the second working port is communicated with the communication channel;

[0012] When the valve stem is located at the second working position, the first working port is communicated with the communication channel.

[0013] With the above structure, the connecting member is provided with a first opening and a second opening, and both ends thereof are sealed and matched with the inner wall of the valve cavity so that the medium in the connecting channel can flow with the medium part in the valve cavity;

[0014] Since the fourth working port is located on the inner wall of the valve cavity which is not facing the first opening and the second opening, the fourth working port is always connected to the valve cavity;

[0015] When the valve stem is in the first working position, the connecting member moves synchronously with the valve stem, and the second working port is connected with the connecting passage, that is, the second working port is connected with the third working port, and the first working port is located outside the connecting member, so the first working port is connected with the fourth working port through the valve cavity;

[0016] When the valve stem is in the second working position, the connecting member moves synchronously with the valve stem, the first working port is connected with the connecting channel, that is, the first working port is connected with the third working port, and the second working port is located outside the connecting member, so the second working port is connected with the fourth working port through the valve cavity.

[0017] When in use, a two-position four-way valve can replace at least two two-way valves, which undoubtedly reduces the cost of using the valve; and for the pipeline system, the failure rate of a single solenoid valve structure is definitely lower than that of a multiple solenoid valve structure, so the reliability is also higher.

[0018] Further, the valve body is provided with a drive shaft hole connected to the valve cavity, the axial direction of the drive shaft hole is consistent with the axial direction of the valve stem, and the valve stem is movably arranged in the drive shaft hole; the electromagnetic drive device comprises an electromagnetic coil sleeved outside the drive shaft hole, a static iron core arranged at one end of the drive shaft hole away from the valve cavity, and a reset elastic member acting on the valve stem, the valve stem is formed as a moving iron core, and the reset elastic member acts on the valve stem so that the valve stem has a tendency to move toward the first working position;

[0019] When the electromagnetic coil is powered off, the valve stem is located at the first working position;

[0020] When the electromagnetic coil is energized, the valve stem is located at the second working position.

[0021] With the above structure, when the electromagnetic coil is powered off, the electromagnetic coil does not generate electromagnetic force, and under the action of the reset elastic member, the valve stem moves toward the first working position and remains at the first working position;

[0022] When the electromagnetic coil is powered on, the electromagnetic coil generates an electromagnetic force so that the valve stem overcomes the elastic force of the resetting elastic member and moves toward the second working position and remains at the second working position.

[0023] Specifically, the valve stem moves along its axial direction. When the solenoid valve structure is in a state where the first working port is above the second working port, the valve stem moves downward along its axial direction when the solenoid coil is powered off, and moves upward along its axial direction when the solenoid coil is powered on. The reset elastic member is a spring.

[0024] Further, the connecting member includes a mounting member, a sliding member, and a driving elastic member; the mounting member is provided with a mounting through hole running through the mounting through hole; two sliding members are provided and are slidably arranged at both ends of the mounting through hole, and a first sealing member is provided at one end of the two sliding members facing the inner wall of the valve cavity, and the driving elastic member acts on the two sliding members so that the two sliding members have a tendency to move toward the inner wall of the valve cavity; the two sliding members are provided with a hollow through hole, and the hollow through holes in the two sliding members and the mounting through hole in the mounting member form the connecting channel.

[0025] With the above structure, under the action of the driving elastic member, the two sliding members have a tendency to move toward the inner wall of the valve cavity, so that the first sealing members on the two sliding members are always in sealing cooperation with the inner wall of the valve cavity; the setting of the driving elastic member makes the two sliding members and the inner wall of the valve cavity in an active sealing cooperation, so when the valve stem drives the connecting member to move, the sealing surface between the first sealing members on the two sliding members and the inner wall of the valve cavity can be automatically adjusted, so that the sealing effect between the connecting member and the inner wall of the valve cavity is better; specifically, the mounting through hole is linear, the two sliding members are arranged back to back, the driving elastic member is arranged between the two sliding members and the driving elastic member is in a compressed state, so that the two sliding members move away from each other and toward the inner wall of the valve cavity.

[0026] Furthermore, the first sealing member on the sliding member is directly connected to the sliding member through a rubber injection molding process, and the sliding member is made of brass. The first sealing member is arranged on the sliding member through the rubber injection molding process, so that the volume of the sliding member is smaller and the sealing effect is better.

[0027] Furthermore, a second sealing member is provided between the sliding member and the inner wall of the mounting through hole.

[0028] With the above structure, since the sliding member and the mounting through hole are slidably mounted, there will be a certain gap between the two. The second sealing member can seal the gap between the sliding member and the mounting through hole to achieve the sealing sliding of the sliding member in the through hole, so that the communication channel and the valve chamber are sealed and isolated.

[0029] Specifically, the sliding member is recessed on the outer wall of the mounting through hole to form a second sealing member mounting groove for mounting the second sealing member; the second sealing member is a V-ring.

[0030] Furthermore, the mounting member includes a mounting member body and a metal insert, the mounting member body is provided with a through hole matching the metal insert for installing the metal insert; the metal insert is provided with a through hole formed as the mounting through hole.

[0031] With the above structure, the metal insert can ensure the centering degree and surface finish of the mounting through hole; the mounting part body is a plastic injection molded part.

[0032] Furthermore, at least an inner wall of the hollow through hole in the sliding member on a side close to the inner wall of the valve cavity is inclined toward an axis side away from the hollow through hole along a direction close to the inner wall of the valve cavity.

[0033] The inclination of the inner wall of the hollow channel increases the size of the first opening and the second opening. With the above structure, the stroke of the valve stem is reduced as much as possible on the basis of ensuring that the first opening can be switched and connected with the first working port and the second working port, thereby reducing the power of the electromagnetic coil. At the same time, it is ensured that when the valve stem switches the working position, the second opening can always be connected with the third working port.

[0034] Specifically, the hollow channel includes a cylindrical section and a conical section in sequence along the direction close to the inner wall of the valve cavity, the upper bottom surface of the conical section is matched and connected with the cylindrical section, the lower bottom surface of the conical end faces the inner wall of the valve cavity and has a larger area than the upper bottom surface, and the lower bottom surface of the conical end forms the first opening or the second opening.

[0035] Furthermore, a dovetail groove is provided at the connection between the connecting piece and the valve stem, and one end of the valve stem used to install the connecting piece is provided with a dovetail protrusion matching the dovetail groove, and the connecting piece and the valve stem are installed by matching the dovetail groove and the dovetail protrusion.

[0036] With the above structure, the connecting piece and the valve stem form a dovetail connection through the dovetail groove and the dovetail protrusion, which is an axial forced connection. The connection between the connecting piece and the valve stem is more firm and reliable, further ensuring the synchronous movement of the connecting piece with the valve stem.

[0037] Further, a first sealing seat is provided on the inner wall of the valve cavity on one side of which the first working port and the second working port are provided, one end of the connecting piece provided with a first opening is sealedly matched with the first sealing seat, and the first sealing seat is provided with a first through hole and a second through hole respectively connected with the first working port and the second working port;

[0038] A second sealing seat is arranged on the inner wall of the valve cavity on one side of which the third working port is arranged, one end of the connecting piece is provided with a second opening and seals with the second sealing seat, and a third through hole communicating with the third working port is arranged on the second sealing seat.

[0039] The third working port is communicated with the communication channel through a third through hole.

[0040] When the valve stem is located at the first working position, the second working port is connected to the communication channel through the second through hole;

[0041] When the valve stem is located at the second working position, the first working port is communicated with the communication channel through the first through hole.

[0042] The material of the first sealing seat and the second sealing seat is PTFE plus graphite, and is formed in one step through a polytetrafluoroethylene molding process and then subjected to a grinding process. The above structure ensures the sealing and lubricity of the first sealing seat and the second sealing seat, so that the connecting piece can cooperate with the first sealing seat and the second sealing seat in a sliding seal; the first sealing seat and the second sealing seat are on the same center line, and the two are parallel to each other.

[0043] Specifically, the inner wall of the valve cavity on one side of which the first working port and the second working port are arranged is recessed to form a first sealing seat installation groove matching the first sealing seat, the first sealing seat installation groove is respectively raised at the first working port and the second working port to form a first protrusion and a second protrusion, the first sealing seat is respectively recessed on one side facing the first working port and the second working port to form a first groove and a second groove matching the first protrusion and the second protrusion, when the first sealing seat is installed to the first sealing seat groove, a third sealing member is arranged between the first protrusion and the first groove, and a fourth sealing member is arranged between the second protrusion and the second groove, A fifth seal is provided between the first seal seat and the first seal seat mounting groove, and the first seal seat is recessed to form a fifth seal mounting groove for mounting the fifth seal; the third seal, the fourth seal and the fifth seal are all O-rings; with the above structure, the third seal and the fourth seal seal seal each other and isolate the connected first working port and the first through hole from the connected second working port and the second through hole; the fifth seal seals the mounting gap between the first seal seat and the first seal seat mounting groove to prevent the valve cavity from being connected to the first working port and the second working port through the mounting gap between the first seal seat and the first seal seat mounting groove;

[0044] The inner wall of the valve cavity inner wall on one side of which the third working opening is arranged is recessed to form a second sealing seat mounting groove matching the second sealing seat, a sixth sealing member is arranged between the second sealing seat and the second sealing seat mounting groove, and the second sealing seat recess is formed to form a sixth sealing member mounting groove for mounting the sixth sealing member; the above structure prevents the third working opening from being connected through the mounting gap between the second sealing seat and the second sealing seat mounting groove.

[0045] Further, the valve body includes a valve body, a valve cover, and a magnetic isolation tube; the first working hole and the second working hole are arranged on the valve cover, the third working hole and the fourth working hole are arranged on the valve body, and the valve body and the valve cover are combined to form the valve cavity; the magnetic isolation tube is arranged on the valve body and the magnetic isolation tube is provided with an inner hole and passes through the valve body for installing the side wall of the magnetic isolation tube and is connected with the valve cavity to form the drive shaft hole.

[0046] A seventh sealing member is provided between the magnetic isolation tube and the valve body.

[0047] Furthermore, the resetting elastic member is located between the static iron core and the valve stem;

[0048] The solenoid valve structure includes a guide column provided with a first elastic member mounting groove, and one end of the valve stem is recessed toward the static iron core to form a second elastic member mounting groove, and both ends of the reset elastic member extend into the first elastic member mounting groove and the second elastic member groove respectively, and most of one end of the guide column extends into the second elastic member mounting groove, and the other end abuts against the static iron core.

[0049] By adopting the above structure, it is ensured that the reset elastic member is not twisted and deformed during the extension and retraction process, while ensuring the elastic force accuracy of the reset elastic member, further increasing the service life of the reset elastic member; most of the guide column extends into the second elastic member installation groove, which can be understood as more than half of the guide column extends into the second elastic member installation groove.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] (1) The solenoid valve structure of the present invention can realize the function of a two-position four-way valve and has a simple structure.

[0052] (2) The solenoid valve structure of the present invention has a reasonable structural design and a better sealing effect.

[0053] (3) The solenoid valve structure of the present invention can replace at least two two-way valves, which undoubtedly reduces the cost of using the valve; and for the pipeline system, the failure rate of a single solenoid valve structure is definitely lower than that of a multiple solenoid valve structure, so the reliability is also higher.

[0054] (4) The solenoid valve structure of the present invention is applicable to neutral media such as air and water, and is also applicable to light oil with low viscosity. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a three-dimensional structural schematic diagram of the solenoid valve structure of the present invention;

[0056] Figure 2 It is a cross-sectional structural schematic diagram of the solenoid valve structure of the present invention;

[0057] Figure 3 It is a schematic cross-sectional structure diagram of the solenoid valve structure of the present invention in another direction;

[0058] Figure 4 It is a structural schematic diagram of a connecting piece in the solenoid valve structure of the present invention;

[0059] Figure 5It is a structural schematic diagram of the mounting member in the connecting member of the solenoid valve structure of the present invention;

[0060] Figure 6 It is a structural schematic diagram of a sliding member in a connecting member of the solenoid valve structure of the present invention;

[0061] Figure 7 It is a schematic diagram of the connection structure between the valve stem and the connecting piece in the solenoid valve structure of the present invention;

[0062] Figure 8 It is a structural schematic diagram of the valve cover in the solenoid valve structure of the present invention;

[0063] Fig. 9 It is a structural schematic diagram of the solenoid valve structure of the present invention when the valve stem is located at the first working position (under power-off condition);

[0064] Fig.10 It is a structural schematic diagram of the solenoid valve structure of the present invention when the valve stem is located at the second working position (when power is on);

[0065] Figure numerals: 1 valve body; 101 valve cavity; 1011 first sealing seat mounting groove; 1011a first protrusion; 1011b second protrusion; 1012 second sealing seat mounting groove; 102 first working hole; 1021 first working port; 103 second working hole; 1031 second working port; 104 third working hole; 1041 third working port; 105 fourth working hole; 1051 fourth working port; 106 drive shaft hole; 107 valve body; 108 valve cover; 109 magnetic isolation tube; 2 valve stem; 201 dovetail protrusion; 202 second elastic member mounting groove; 3 connecting member; 301 connecting channel; 302 first opening; 303 second opening; 304 mounting member; 3041 mounting through hole; 3042 mounting member body; 3043 metal insert; 305 sliding member; 3051 Hollow through hole; 3051a cylindrical section; 3051b truncated cone section; 3052 second sealing member mounting groove; 306 driving elastic member; 307 dovetail groove; 4 electromagnetic driving device; 401 electromagnetic coil; 402 static iron core; 403 resetting elastic member; 5 first sealing seat; 501 first through hole; 502 second through hole; 503 first groove; 504 second groove; 6 second sealing seat; 601 third through hole; 7 guide column; 701 first elastic member mounting groove; 8 first sealing member; 9 second sealing member; 10 third sealing member; 11 fourth sealing member; 12 fifth sealing member; 13 sixth sealing member; 14 seventh sealing member. DETAILED DESCRIPTION

[0066] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0067] like Figure 1 As shown in FIG. 10 , a solenoid valve structure comprises a valve body 1 having a valve cavity 101 therein, a valve stem 2 movably disposed in the valve cavity 101, and an electromagnetic drive device 4 disposed on the valve body 1 for driving the valve stem 2 to move;

[0068] The valve body 1 is provided with a first working hole 102, a second working hole 103, a third working hole 104 and a fourth working hole 105 which are connected with the valve cavity 101. The first working hole 102, the second working hole 103, the third working hole 104 and the fourth working hole 105 respectively form a first working port 1021, a second working port 1031, a third working port 1041 and a fourth working port 1051 on the inner wall of the valve cavity 101;

[0069] A connecting piece 3 is provided at one end of the valve stem 2, and the connecting piece 3 is provided with a connecting passage 301 penetrating the connecting piece 3 and forming a first opening 302 and a second opening 303; both ends of the connecting piece 3 provided with the first opening 302 and the second opening 303 are sealed and matched with the inner wall of the valve cavity 101;

[0070] The first working port 1021 and the second working port 1031 are located on the inner wall of the valve cavity 101 facing the first opening 302 and are distributed along the moving direction of the valve stem 2; the third working port 1041 is located on the inner wall of the valve cavity 101 facing the second opening 303; the fourth working port 1051 is located on the inner wall of the valve cavity 101 not facing the first opening 302 or the second opening 303;

[0071] The communication channel 301 is always connected to the third working port 1041;

[0072] When the valve stem 2 is located at the first working position, the second working port 1031 is communicated with the communication channel 301;

[0073] When the valve stem 2 is located at the second working position, the first working port 1021 is communicated with the communication channel 301 .

[0074] With the above structure, the connecting member 3 is provided with a first opening 302 and a second opening 303, and both ends thereof are sealed with the inner wall of the valve cavity 101 so that the medium in the connecting channel 301 can flow with the medium in the valve cavity 101;

[0075] Since the fourth working port 1051 is located on the inner wall of the valve cavity 101 which is not facing the first opening 302 and the second opening 303, the fourth working port 1051 is always connected to the valve cavity 101;

[0076] like Fig. 9 As shown, when the valve stem 2 is in the first working position, the connecting member 3 moves synchronously with the valve stem 2, and the second working port 1031 is connected with the connecting channel 301, that is, the second working port 1031 is connected with the third working port 1041, and the first working port 1021 is located outside the connecting member 3, so the first working port 1021 is connected with the fourth working port 1051 through the valve cavity 101;

[0077] like Fig.10 As shown, when the valve stem 2 is in the second working position, the connecting member 3 moves synchronously with the valve stem 2, and the first working port 1021 is connected to the connecting channel 301, that is, the first working port 1021 is connected to the third working port 1041, and the second working port 1031 is located on the outside of the connecting member 3, so the second working port 1031 is connected to the fourth working port 1051 through the valve cavity 101.

[0078] When in use, a two-position four-way valve can replace at least two two-way valves, which undoubtedly reduces the cost of using the valve; and for the pipeline system, the failure rate of a single solenoid valve structure is definitely lower than that of a multiple solenoid valve structure, so the reliability is also higher.

[0079] like Figure 2 As shown, preferably, the valve body 1 is provided with a drive shaft hole 106 communicating with the valve cavity 101, the axial direction of the drive shaft hole 106 is consistent with the axial direction of the valve stem 2, and the valve stem 2 is movably arranged in the drive shaft hole 106; the electromagnetic drive device 4 includes an electromagnetic coil 401 sleeved outside the drive shaft hole 106, a static iron core 402 arranged at one end of the drive shaft hole 106 away from the valve cavity 101, and a reset elastic member 403 acting on the valve stem 2, the valve stem 2 is formed as a moving iron core, and the reset elastic member 403 acts on the valve stem 2 so that the valve stem 2 has a tendency to move toward the first working position;

[0080] When the electromagnetic coil 401 is powered off, the valve stem 2 is located at the first working position;

[0081] When the electromagnetic coil 401 is energized, the valve stem 2 is located at the second working position.

[0082] With the above structure, when the electromagnetic coil 401 is powered off, the electromagnetic coil 401 does not generate electromagnetic force, and under the action of the reset elastic member 403, the valve stem 2 moves toward the first working position and remains at the first working position;

[0083] When the electromagnetic coil 401 is powered on, the electromagnetic coil 401 generates an electromagnetic force to enable the valve stem 2 to overcome the elastic force of the resetting elastic member 403 and move toward the second working position and remain at the second working position.

[0084] Specifically, the valve stem 2 moves along its axial direction. When the solenoid valve structure is in a state where the first working port 1021 is located above the second working port 1031, when the solenoid coil 401 is powered off, the valve stem 2 moves downward along its axial direction. When the solenoid coil 401 is powered on, the valve stem 2 moves upward along its axial direction. The reset elastic member 403 is a spring.

[0085] like Figure 4 , 6 As shown, preferably, the connecting member 3 includes a mounting member 304, a sliding member 305, and a driving elastic member 306; the mounting member 304 is provided with a mounting through hole 3041 running through the mounting through hole 3041; the sliding member 305 is provided with two and is slidably arranged at both ends of the mounting through hole 3041, and the two sliding members 305 are provided with a first sealing member 8 at one end facing the inner wall of the valve cavity 101, and the driving elastic member 306 acts on the two sliding members 305 so that the two sliding members 305 have a tendency to move toward the inner wall of the valve cavity 101; the two sliding members 305 are provided with a hollow through hole 3051, and the hollow through holes 3051 in the two sliding members 305 and the mounting through hole 3041 in the mounting member 304 form the connecting channel 301.

[0086] With the above structure, under the action of the driving elastic member 306, the two sliding members 305 have a tendency to move toward the inner wall of the valve cavity 101, so that the first sealing members 8 on the two sliding members 305 are always sealed with the inner wall of the valve cavity 101; the setting of the driving elastic member 306 makes the two sliding members 305 and the inner wall of the valve cavity 101 form an active sealing cooperation, so when the valve stem 2 drives the connecting member 3 to move, the sealing surface between the first sealing members 8 on the two sliding members 305 and the inner wall of the valve cavity 101 can be automatically adjusted, so that the sealing effect between the connecting member 3 and the inner wall of the valve cavity 101 is better; specifically, the mounting through hole 3041 is linear, the two sliding members 305 are arranged back to back, the driving elastic member 306 is arranged between the two sliding members 305 and the driving elastic member 306 is in a compressed state, so that the two sliding members 305 move away from each other toward the inner wall of the valve cavity 101.

[0087] Preferably, the first sealing member 8 on the sliding member 305 is directly connected to the sliding member 305 by a rubber injection molding process, and the sliding member 305 is made of brass. The first sealing member 8 is arranged on the sliding member 305 by a rubber injection molding process, so that the volume of the sliding member 305 is smaller and the sealing effect is better.

[0088] Preferably, a second sealing member 9 is provided between the sliding member 305 and the inner wall of the mounting through hole 3041 .

[0089] With the above structure, since the sliding member 305 and the mounting through hole 3041 are slidably mounted, there will be a certain gap between the two. The second sealing member 9 can seal the gap between the sliding member 305 and the mounting through hole 3041 to achieve the sealing sliding of the sliding member 305 in the through hole, so that the communication channel 301 and the valve chamber 101 are sealed and isolated.

[0090] Specifically, the outer wall of the sliding member 305 facing the mounting through hole 3041 is recessed to form a second sealing member mounting groove 3052 for mounting the second sealing member 9; the second sealing member 9 is a V-ring.

[0091] like Figure 5 As shown, preferably, the mounting member 304 includes a mounting member body 3042 and a metal insert 3043, wherein the mounting member body 3042 is provided with a through hole matching the metal insert 3043 for installing the metal insert 3043; and the metal insert 3043 is provided with a through hole formed as the mounting through hole 3041.

[0092] With the above structure, the metal insert 3043 can ensure the centering degree and surface smoothness of the mounting through hole 3041; the mounting part body 3042 is a plastic injection molded part.

[0093] Preferably, at least the inner wall of the hollow through hole 3051 in the sliding member 305 close to the inner wall of the valve cavity 101 is inclined along the direction close to the inner wall of the valve cavity 101 toward the axis side away from the hollow through hole 3051 .

[0094] The inclination of the inner wall of the hollow channel increases the size of the first opening 302 and the second opening 303. With the above structure, the stroke of the valve stem 2 is reduced as much as possible on the basis of ensuring that the first opening 302 can be switched and connected with the first working port 1021 and the second working port 1031, thereby reducing the power of the electromagnetic coil 401. At the same time, it is ensured that when the valve stem 2 switches the working position, the second opening 303 can always be connected with the third working port 1041.

[0095] Specifically, the hollow channel includes a cylindrical section 3051a and a frustum section 3051b in sequence along the direction close to the inner wall of the valve cavity 101, the upper bottom surface of the frustum section 3051b is matched and connected with the cylindrical section 3051a, the lower bottom surface of the frustum end faces the inner wall of the valve cavity 101 and has a larger area than the upper bottom surface, and the lower bottom surface of the frustum end forms the first opening 302 or the second opening 303.

[0096] like Figure 7 As shown, preferably, a dovetail groove 307 is provided at the connection between the connecting piece 3 and the valve stem 2, and one end of the valve stem 2 used for installing the connecting piece 3 is provided with a dovetail protrusion 201 matching the dovetail groove 307, and the connecting piece 3 and the valve stem 2 are installed by matching the dovetail groove 307 and the dovetail protrusion 201.

[0097] With the above structure, the connecting piece 3 and the valve stem 2 form a dovetail connection through the dovetail groove 307 and the dovetail protrusion 201, which is an axial forced connection. The connection between the connecting piece 3 and the valve stem 2 is more firm and reliable, further ensuring the synchronous movement of the connecting piece 3 with the valve stem 2.

[0098] like Figure 2 , 8 As shown, preferably, a first sealing seat 5 is provided on the inner wall of the valve cavity 101 on one side of which the first working port 1021 and the second working port 1031 are provided, and one end of the connecting member 3 provided with the first opening 302 is sealedly matched with the first sealing seat 5, and the first sealing seat 5 is provided with a first through hole 501 and a second through hole 502 which are respectively connected with the first working port 1021 and the second working port 1031;

[0099] A second sealing seat 6 is provided on the inner wall of the valve cavity 101 on one side of which the third working port 1041 is provided. One end of the connecting piece 3 having a second opening 303 is sealedly matched with the second sealing seat 6. The second sealing seat 6 is provided with a third through hole 601 connected to the third working port 1041.

[0100] The third working port 1041 is connected to the communication channel 301 through the third through hole 601 .

[0101] When the valve stem 2 is located at the first working position, the second working port 1031 is connected to the communication channel 301 through the second through hole 502;

[0102] When the valve stem 2 is located at the second working position, the first working port 1021 is communicated with the communication channel 301 through the first through hole 501 .

[0103] The material of the first sealing seat 5 and the second sealing seat 6 is PTFE plus graphite, and is formed in one step through a polytetrafluoroethylene molding process and then subjected to a grinding process. The above structure ensures the sealing and lubricity of the first sealing seat 5 and the second sealing seat 6, so that the connecting piece 3 can slide and seal with the first sealing seat 5 and the second sealing seat 6; the first sealing seat 5 and the second sealing seat 6 are on the same center line, and the two are parallel to each other.

[0104] Specifically, the inner wall of the valve cavity 101 on one side of which the first working port 1021 and the second working port 1031 are arranged is recessed to form a first sealing seat installation groove 1011 matching the first sealing seat 5, and the first sealing seat installation groove 1011 is respectively raised at the first working port 1021 and the second working port 1031 to form a first protrusion 1011a and a second protrusion 1011b, and the first sealing seat 5 is recessed on one side facing the first working port 1021 and the second working port 1031 to form a first groove 503 and a second groove 504 matching the first protrusion 1011a and the second protrusion 1011b, respectively, and when the first sealing seat 5 is installed in the groove of the first sealing seat 5, a third sealing member 10 is arranged between the first protrusion 1011a and the first groove 503, and the A fourth sealing member 11 is provided between the second protrusion 1011b and the second groove 504, and a fifth sealing member 12 is provided between the first sealing seat 5 and the first sealing seat mounting groove 1011; the third sealing member 10, the fourth sealing member 11 and the fifth sealing member 12 are all O-rings; with the above structure, the third sealing member 10 and the fourth sealing member 11 make the connected first working port 1021 and the first through hole 501 and the connected second working port 1031 and the second through hole 502 sealed and isolated from each other; the fifth sealing member 12 seals the installation gap between the first sealing seat 5 and the first sealing seat mounting groove 1011, so as to prevent the valve cavity 101 from being connected with the first working port 1021 and the second working port 1031 through the installation gap between the first sealing seat 5 and the first sealing seat mounting groove 1011;

[0105] The inner wall of the valve chamber 101 on one side of which the third working opening 1041 is arranged is recessed to form a second sealing seat mounting groove 1012 matching the second sealing seat 6, a sixth sealing member 13 is arranged between the second sealing seat 6 and the second sealing seat mounting groove 1012, and the second sealing seat 6 is recessed to form a sixth sealing member mounting groove for mounting the sixth sealing member 13; the above structure prevents the third working opening from being connected through the installation gap between the second sealing seat 6 and the second sealing seat mounting groove 1012.

[0106] like Figure 2As shown, preferably, the valve body 1 includes a valve body 107, a valve cover 108, and a magnetic isolation tube 109; the first working hole 102 and the second working hole 103 are arranged on the valve cover 108, the third working hole 104 and the fourth working hole 105 are arranged on the valve body 107, and the valve body 107 and the valve cover 108 are combined to form the valve cavity 101; the magnetic isolation tube 109 is arranged on the valve body 107 and the magnetic isolation tube 109 is provided with an inner hole and passes through the valve body 107 for installing the side wall of the magnetic isolation tube 109 and is connected with the valve cavity 101 to form the drive shaft hole 106.

[0107] A seventh sealing member 14 is provided between the magnetic isolation tube 109 and the valve body 107 .

[0108] Preferably, the resetting elastic member 403 is located between the static iron core 402 and the valve stem 2;

[0109] The solenoid valve structure includes a guide column 7 provided with a first elastic member mounting groove 701, and one end of the valve stem 2 is recessed toward the static iron core 402 to form a second elastic member mounting groove 202, and both ends of the reset elastic member 403 extend into the first elastic member mounting groove 701 and the second elastic member groove respectively, and most of one end of the guide column 7 extends into the second elastic member mounting groove 202, and the reset elastic member 403 abuts against the static iron core 402 through the guide column 7.

[0110] The above structure is adopted to ensure that the reset elastic member 403 is not twisted and deformed during the extension and retraction process, while ensuring the elastic force accuracy of the reset elastic member 403, further increasing the service life of the reset elastic member 403; most of the guide column 7 extends into the second elastic member installation groove 202, which can be understood as more than half of the guide column 7 extends into the second elastic member installation groove 202.

[0111] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A solenoid valve structure, characterized in that: It comprises a valve body (1) having a valve cavity (101) therein, a valve stem (2) movably arranged in the valve cavity (101), and an electromagnetic drive device (4) arranged on the valve body (1) and used for driving the valve stem (2) to move; The valve body (1) is provided with a first working hole (102), a second working hole (103), a third working hole (104) and a fourth working hole (105) which are in communication with the valve cavity (101); the first working hole (102), the second working hole (103), the third working hole (104) and the fourth working hole (105) respectively form a first working port (1021), a second working port (1031), a third working port (1041) and a fourth working port (1051) on the inner wall of the valve cavity (101); A connecting piece (3) is provided at one end of the valve stem (2); the connecting piece (3) is provided with a connecting passage (301) penetrating the connecting piece and forming a first opening (302) and a second opening (303); both ends of the connecting piece (3) provided with the first opening (302) and the second opening (303) are in sealing cooperation with the inner wall of the valve cavity (101); The first working port (1021) and the second working port (1031) are located on the inner wall of the valve cavity (101) facing the first opening (302), and the first working port (1021) and the second working port (1031) are distributed along the movable direction of the valve stem (2); the third working port (1041) is located on the inner wall of the valve cavity (101) facing the second opening (303); and the fourth working port (1051) is located on the inner wall of the valve cavity (101) not facing the first opening (302) and the second opening (303); The communication channel (301) is always in communication with the third working port (1041); When the valve stem (2) is located at the first working position, the second working port (1031) is in communication with the communication channel (301); When the valve stem (2) is located at the second working position, the first working port (1021) is in communication with the communication channel (301).

2. The solenoid valve structure according to claim 1, characterized in that: The valve body (1) is provided with a drive shaft hole (106) communicating with the valve cavity (101); the axial direction of the drive shaft hole (106) is consistent with the axial direction of the valve stem (2); and the valve stem (2) is movably arranged in the drive shaft hole (106); The electromagnetic drive device (4) comprises an electromagnetic coil (401) sleeved outside the drive shaft hole (106), a static iron core (402) arranged at one end of the drive shaft hole (106) away from the valve chamber (101), and a reset elastic member (403) acting on the valve stem (2), the valve stem (2) being formed as a movable iron core, and the reset elastic member (403) acting on the valve stem (2) causes the valve stem (2) to have a tendency to move toward the first working position; When the electromagnetic coil (401) is powered off, the valve stem (2) is located in a first working position; When the electromagnetic coil (401) is energized, the valve stem (2) is located in the second working position.

3. The solenoid valve structure according to claim 1, characterized in that: The connecting member (3) comprises a mounting member (304), a sliding member (305), and a driving elastic member (306); the mounting member (304) is provided with a mounting through hole (3041) penetrating the mounting through hole (3041); two sliding members (305) are provided and are slidably arranged at the two ends of the mounting through hole (3041), and the two sliding members (305) are provided with a first sealing member (8) at one end facing the inner wall of the valve cavity (101); the driving elastic member (306) acts on the two sliding members (305) so that the two sliding members (305) have a tendency to move toward the inner wall of the valve cavity (101); the two sliding members (305) are provided with a hollow through hole (3051), and the hollow through holes (3051) in the two sliding members (305) and the mounting through hole (3041) in the mounting member (304) form the connecting channel (301).

4. The solenoid valve structure according to claim 3, characterized in that: A second sealing member (9) is provided between the sliding member (305) and the inner wall of the mounting through hole (3041).

5. The solenoid valve structure according to claim 3, characterized in that: The mounting member (304) comprises a mounting member body (3042) and a metal insert (3043); the mounting member body (3042) is provided with a through hole matching the metal insert (3043) for mounting the metal insert (3043); and the metal insert (3043) is provided with a through hole formed as the mounting through hole (3041).

6. The solenoid valve structure according to claim 3, characterized in that: At least the inner wall of the hollow through hole (3051) in the sliding member (305) on the side close to the inner wall of the valve cavity (101) is inclined along the direction close to the inner wall of the valve cavity (101) towards the axial side away from the hollow through hole (3051).

7. The solenoid valve structure according to claim 1, characterized in that: A dovetail groove (307) is provided at the connection between the connecting piece (3) and the valve stem (2); one end of the valve stem (2) for mounting the connecting piece (3) is provided with a dovetail protrusion (201) matching the dovetail groove (307); the connecting piece (3) and the valve stem (2) are mounted by matching the dovetail groove (307) and the dovetail protrusion (201).

8. The solenoid valve structure according to claim 1, characterized in that: A first sealing seat (5) is arranged on the inner wall of the valve cavity (101) on one side of which the first working port (1021) and the second working port (1031) are arranged; one end of the connecting member (3) having a first opening (302) is sealingly matched with the first sealing seat (5); and the first sealing seat (5) is provided with a first through hole (501) and a second through hole (502) which are respectively connected with the first working port (1021) and the second working port (1031); A second sealing seat (6) is arranged on the inner wall of one side of the inner wall of the valve cavity (101) where the third working port (1041) is arranged; one end of the connecting piece (3) having a second opening (303) is sealingly matched with the second sealing seat (6); and the second sealing seat (6) is provided with a third through hole (601) communicating with the third working port (1041).

9. The solenoid valve structure according to claim 2, characterized in that: The valve body (1) comprises a valve body (107), a valve cover (108), and a magnetic isolation tube (109); the first working hole (102) and the second working hole (103) are arranged on the valve cover (108), and the third working hole (104) and the fourth working hole (105) are arranged on the valve body (107); the valve body (107) and the valve cover (108) are combined to form the valve cavity (101); the magnetic isolation tube (109) is arranged on the valve body (107) and the magnetic isolation tube (109) is provided with an inner hole and passes through the valve body (107) for installing the side wall of the magnetic isolation tube (109) and is connected with the valve cavity (101) to form the drive shaft hole (106).

10. The solenoid valve structure according to claim 2, characterized in that: The resetting elastic member (403) is located between the static iron core (402) and the valve stem (2); The solenoid valve structure comprises a guide column (7) provided with a first elastic member mounting groove (701); one end of the valve stem (2) is recessed toward the static iron core (402) to form a second elastic member mounting groove (202); two ends of the reset elastic member (403) respectively extend into the first elastic member mounting groove (701) and the second elastic member groove and a majority of the guide column (7) extends into the second elastic member mounting groove (202); the reset elastic member (403) abuts against the static iron core (402) via the guide column (7).

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