A normally open three-way solenoid valve
By setting the magnet tube and buffer parts outside the moving iron of the solenoid valve, the noise problem and magnetic stability problem during the operation of the solenoid valve are solved, and more efficient and sensitive solenoid valve performance is achieved.
Patent Information
- Application Number
- CN202420658329.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-01
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-04-01
Smart Images
Figure CN222732179U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to electromagnetic valve technology, in particular to a normally open three-way electromagnetic valve. Background Art
[0002] At present, three-way valves are widely used in hydraulic and pneumatic control systems. Its main structure is that three fluid medium interfaces are set on the valve body, and the inside of the valve body is a valve cavity connected to the three fluid medium interfaces. A movable valve core is set in the valve cavity, and the opening and closing of the channels between different interfaces on the valve body are controlled by changing the position of the valve core. Common three-way valves include two-position three-way valves or three-position three-way valves, which are generally driven mechanically or electromagnetically to control the movement of the valve core to achieve the purpose of reversing. Taking a two-position three-way solenoid valve as an example, an electromagnet is used to drive one end, and the other end is reset by mechanical force such as a spring.
[0003] However, when the existing solenoid valve is in operation, the moving magnet plays a role of closing or opening, so it is easy to generate a large noise during operation. In addition, the moving iron is exposed and easily magnetized by the external structure, which affects the magnetic properties. Utility Model Content
[0004] In order to overcome the deficiencies of the prior art, the utility model provides a normally open three-way solenoid valve, wherein a magnetic isolation tube is arranged outside the moving iron to prevent the moving iron from being exposed and magnetized by an external structure, thereby improving magnetic stability.
[0005] The purpose of the utility model is achieved by the following technical solutions:
[0006] A normally open three-way solenoid valve, comprising:
[0007] A valve seat, wherein a valve cavity is provided in the valve seat, a first channel is provided at the bottom end of the valve cavity, a second channel and a third channel are provided at the side of the valve cavity, and the second channel and the third channel are distributed at intervals in the height direction of the valve body;
[0008] A valve core assembly, comprising a valve body, a first valve core, a second valve core and an elastic component, wherein the valve body is installed in the valve cavity, the valve body is provided with a guide cavity, a first through hole and a second through hole, the first valve core and the second valve core are both installed in the guide cavity and are distributed up and down, the outer wall of the first valve core and the inner wall of the guide cavity are spaced to form a guide gap; the outer wall of the second valve core and the inner wall of the guide cavity are sealed and matched; a guide channel communicating with the first channel is provided inside the second valve core; the elastic component is connected between the first valve core and the second valve core, the elastic component is used to provide an elastic stress, the elastic stress is used to drive the first valve core away from the guide channel to open the guide channel and close the first through hole; the first through hole and the second through hole are distributed up and down, the first through hole is passed through to the top of the first valve core and communicated with the guide cavity, the second channel is located between the first valve core and the second valve core and communicated with the guide cavity;
[0009] A magnet assembly, the magnet assembly includes a fixed iron, a coil group, a moving iron and a connecting rod, the fixed iron and the coil group are fixedly connected to the valve body, the moving iron is arranged above the fixed iron and penetrates the coil group, and the connecting rod is movably connected to the fixed iron; the top end of the connecting rod is penetrated by the fixed iron and connected to the moving iron, and the bottom end of the connecting rod is penetrated by the fixed iron and connected to the first valve core, and the moving iron is used to drive the first valve core to move downward when the coil group is energized; the outside of the moving iron is covered with a magnetic isolation tube.
[0010] In the first aspect of the utility model, as a preferred embodiment, the magnetic isolation tube is fixed to the valve seat and extends from the top of the valve seat; the moving iron is movably connected to the magnetic isolation tube; and a buffer is provided at the top of the moving iron. In this way, a buffer is provided at the top of the moving iron, which can buffer the impact of the moving iron and achieve the purpose of noise reduction.
[0011] In the first aspect of the present invention, as a preferred embodiment, the buffer is a plastic buffer, so that the impact buffering of the moving iron is achieved by the plastic buffer.
[0012] In the first aspect of the utility model, as a preferred embodiment, the magnet assembly also includes a coil seat, the coil seat is fixedly connected to the top of the valve seat, the coil group is wound in the coil seat, and the magnetic isolation tube is fixedly connected to the coil seat and extends from the top of the coil seat.
[0013] In the first aspect of the utility model, as a preferred embodiment, the middle part of the valve body is sealed with the inner wall of the valve cavity through a first sealing ring. In this way, the valve body is installed in the valve cavity, and the middle part of the valve body can divide the valve cavity into two sections by the first sealing ring, the first through hole and the second channel can be connected to the upper section of the valve cavity, and the second through hole and the third channel can be connected to the lower section of the valve cavity.
[0014] In the first aspect of the utility model, as a preferred embodiment, the outer peripheral wall of the second valve core and the inner wall of the flow guide cavity are sealed by a second sealing ring. In this way, the second sealing ring of the outer peripheral wall of the second valve core can achieve sealing on the outer wall of the second valve core to prevent the fluid from overflowing through the third channel.
[0015] In the first aspect of the utility model, as a preferred embodiment, a first plugging piece is provided at the bottom end of the first valve core, and the first plugging piece is used to plug the diversion channel; the first plugging piece is made of elastic rubber material. In this way, the first plugging piece can be made of elastic rubber, and elastic rubber such as silicone rubber, rubber, etc. can be formed after being subjected to force to form a larger plugging surface, so that the sealing surface is larger and the plugging effect is better.
[0016] In the first aspect of the utility model, as a preferred embodiment, a second plugging member is provided at the top of the first valve core, and the second plugging member is made of elastic rubber material. In this way, the second plugging member can contact with the fixed iron, which can prevent the first valve core from colliding with the fixed iron, and can also close the first through hole to form a larger sealing surface with better sealing performance.
[0017] In the first aspect of the utility model, as a preferred embodiment, the elastic component is a spring, one end of the spring is connected to the first valve core, and the other end of the spring is connected to the second valve core. In this way, the expansion and contraction of the spring can realize the state where the first valve core remains open or closes the second valve core, and the expansion and contraction process is flexible.
[0018] Compared with the prior art, the beneficial effects of the present invention are:
[0019] 1. The utility model can use the third channel as a normally open channel, and the fluid medium can enter through the third channel. When the power is off, the fluid enters through the third channel and enters the diversion cavity through the second through hole. At this time, the diversion channel of the second valve core is in an open state, and the entering fluid can enter through the diversion channel and flow out through the third channel. At this time, the first through hole is closed by the first valve core, and the conduction of one loop of the fluid is realized. When the power is on, the fluid enters through the third channel and enters the diversion cavity through the second channel. At this time, the diversion channel of the second valve core is blocked by the first valve core, and the entering fluid passes through the diversion interval to the first through hole and then conducts through the second channel, realizing the conduction of another loop of the fluid.
[0020] 2. Since the moving iron is located above the fixed iron, in order to prevent the moving iron from being magnetized by the external environment, a magnetic isolation tube can be set outside the moving iron, which can effectively reduce the magnetic flux leakage of the iron core and improve the efficiency and sensitivity of the solenoid valve. Of course, the magnetic isolation tube can effectively absorb and shield electromagnetic interference. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a cross-sectional view of the utility model;
[0022] Figure 2 This is the overall appearance diagram of the utility model;
[0023] Figure 3 It is a schematic diagram of the internal structure of the utility model.
[0024] In the figure: 10, valve seat; 11, valve chamber; 12, second channel; 13, third channel; 14, first channel; 20, valve body; 21, guide chamber; 22, first through hole; 23, second through hole; 30, first valve core; 31, first blocking member; 32, second blocking member; 40, second valve core; 41, guide channel; 50, elastic component; 60, moving iron; 61, magnetic isolation tube; 62, buffer member; 70, fixed iron; 80, coil seat. DETAILED DESCRIPTION
[0025] Below, in conjunction with the accompanying drawings and specific embodiments, the utility model is further described. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except for special instructions, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.
[0026] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "plurality" means two or more, unless otherwise precisely and specifically specified.
[0027] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0028] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0029] like Figure 1 , Figure 2 as well as Figure 3 A normally open three-way solenoid valve shown in the figure includes a valve seat 10, a valve core assembly and a valve body 20 assembly, a valve cavity 11 is provided in the valve seat 10, and a first channel 14 is provided at the bottom end of the valve cavity 11, and a second channel 12 and a third channel 13 are provided on the side of the valve cavity 11, the second channel 12 and the third channel 13 are distributed in an upper and lower interval in the height direction of the valve cavity 11, and the first channel 14, the second channel 12, and the third channel 13 are all connected to the valve cavity 11.
[0030] Specifically, the valve core assembly includes a valve body 20, a first valve core 30, a second valve core 40 and an elastic component 50. The valve body 20 is installed in the valve cavity 11, and the valve body 20 is provided with a guide cavity 21, a first through hole 22 and a second through hole 23. The first valve core 30 and the second valve core 40 are both installed in the guide cavity 21 and are distributed up and down. The outer wall of the first valve core 30 and the inner wall of the guide cavity 21 are spaced to form a guide interval. The outer wall of the second valve core 40 and the inner wall of the guide cavity 21 are sealed and matched, and the second valve core 40 is provided with a guide channel 41 that is connected to the first channel 14. The elastic component 50 is connected between the first valve core 30 and the second valve core 40. The elastic component 50 is used to provide an elastic stress. In a natural state, the elastic stress provided by the elastic component 50 can drive the first valve core 30 away from the guide channel 41 to open the guide channel 41, and the first valve core can close the first through hole after being away from the guide channel.
[0031] The first through hole 22 and the second through hole 23 are distributed up and down. The first through hole 22 passes through to the top of the first valve core 30 and is connected to the guide cavity 21 . The second channel 12 is located between the first valve core 30 and the second valve core 40 and is connected to the guide cavity 21 .
[0032] In addition, the magnet assembly includes a fixed iron 70, a coil group, a moving iron 60 and a connecting rod. The fixed iron 70 and the coil group are fixedly connected to the valve body 20. The moving iron 60 is arranged above the fixed iron 70 and penetrates the coil group. The coil group can be powered on or off. When the coil group is powered on, the connecting rod is movably connected to the fixed iron 70; the top end of the connecting rod is connected to the moving iron 60 by passing through the fixed iron 70, and the bottom end of the connecting rod is passed through the fixed iron 70 and connected to the first valve core 30. The moving iron 60 is used to drive the first valve core 30 to move downward when the coil group is powered on; the outside of the moving iron 60 is provided with a magnetic isolation tube 61.
[0033] On the basis of the above structure, when the normally open three-way solenoid valve of the utility model is used, when the coil group is not energized, the moving iron 60 does not move, the elastic component 50 is in a naturally stretched state, and the elastic stress provided can be applied to the first valve core 30, so that the first valve core 30 is away from the second valve core 40 and is closed at the end of the first through hole, so that the guide channel 41 of the second valve core 40 is opened, the first through hole is closed, and the first channel 14 can be connected with the third channel 13. When the coil group is energized, the moving iron 60 is magnetized and magnetically attracted to the fixed iron 70, and the moving iron 60 moves downward, thereby driving the movable rod to move downward, driving the first valve core 30 connected to the movable rod to move downward, at this time, the first through hole is connected to the guide gap, and the guide channel 41 of the second valve core 40 is blocked, at this time, the third channel 13 is connected to the second channel 12 through the guide gap.
[0034] Specifically, the third channel 13 can be used as a normally open channel, and the fluid medium can enter through the third channel 13. When the power is off, the fluid enters through the third channel 13 and enters the guide cavity 21 through the second through hole 23. At this time, the guide channel 41 of the second valve core 40 is in an open state, and the entering fluid can enter through the guide channel 41 and flow out through the third channel 13. At this time, the first through hole is blocked by the first valve core, and the fluid forms a loop through the third channel, the second through hole, the guide channel and the first channel. When the power is on, the fluid enters through the third channel 13 and enters the guide cavity 21 through the second channel 12. At this time, the guide channel 41 of the second valve core 40 is blocked by the first valve core 30, and the entering fluid passes through the guide interval to the first through hole 22 and then conducts through the second channel 12. The fluid forms a loop through the third channel, the second through hole, the guide interval, the first through hole and the second channel.
[0035] In this embodiment, since the moving iron 60 is located above the fixed iron 70, in order to prevent the moving iron 60 from being magnetized by the external environment, a magnetic isolation tube 61 can be provided outside the moving iron 60, which can effectively reduce the magnetic flux leakage of the iron core and improve the efficiency and sensitivity of the solenoid valve. Of course, using magnetic conductive materials and increasing electromagnetic force for soft magnetic materials can effectively absorb and shield electromagnetic interference.
[0036] Furthermore, specifically, the magnetic isolation tube 61 is fixedly connected to the valve seat 10, and the magnetic isolation tube 61 can extend from the top of the valve seat 10, and the moving iron 60 is movably connected in the magnetic isolation tube 61. In order to prevent the moving iron 60 from colliding with the magnetic isolation tube 61 during the up and down movement and generating excessive noise, and to prevent the two from being too close to each other and attracting the electromagnetic force that affects the downward movement of 60 when the coil is energized, a buffer member 62 can be provided at the top of the moving iron 60, and the buffer member 62 can buffer the impact of the moving iron 60 to achieve the purpose of noise reduction.
[0037] Furthermore, the buffer member 62 is a plastic buffer member 62 , so that the impact buffering of the moving iron 60 can be achieved by the plastic buffer member 62 .
[0038] Furthermore, in order to facilitate the installation of the coil, the magnet assembly in this embodiment also includes a coil seat 80, which is fixedly connected to the top of the valve seat 10. A coil winding cavity can be set in the coil seat 80, and the coil group is wound in the coil seat 80 and is located in the coil winding cavity. The above-mentioned magnetic isolation tube 61 is fixedly connected to the coil seat 80 and extends from the top of the coil seat 80. In this way, the magnetic isolation tube 61 and the coil can be installed with the coil seat 80 as the assembly basis.
[0039] Furthermore, the middle part of the valve body 20 is sealed with the inner wall of the valve cavity 11 through a first sealing ring, so that the valve body 20 is installed in the valve cavity 11, and the middle part of the valve body 20 can separate the valve cavity 11 into two sections by the first sealing ring, the first through hole 22 and the second channel 12 can be connected to the upper section of the valve cavity 11, and the second through hole 23 and the third channel 13 can be connected to the lower section of the valve cavity 11.
[0040] Furthermore, the outer wall of the second valve core 40 is sealed with the inner wall of the guide cavity 21 through a second sealing ring, so that the second sealing ring of the outer wall of the second valve core 40 can seal on the outer wall of the second valve core 40 to prevent the fluid from overflowing through the third channel 13.
[0041] Furthermore, a first blocking piece 31 is provided at the bottom end of the first valve core 30, and the blocking piece is used to block the guide channel 41; the first blocking piece 31 is made of elastic rubber material, and when the first valve core 30 moves downward, the first blocking piece 31 at the bottom end of the first valve core 30 can directly block the second valve core 40. The first blocking piece 31 can be made of elastic rubber, and elastic rubber such as silicone, rubber, etc. can be formed after being subjected to force to form a larger sealing surface, so that the sealing surface is larger and the sealing effect is better.
[0042] Furthermore, a second blocking member 32 may be provided at the top end of the first valve core 30. The second blocking member 32 is made of elastic rubber material. When the first valve core 30 is upward, the second blocking member 32 may contact the fixed iron 70, which can prevent the first valve core 30 from colliding with the fixed iron 70 and also close the first through hole to form a larger sealing surface with better sealing.
[0043] Furthermore, the elastic component 50 is a spring, one end of the spring is connected to the first valve core 30, and the other end of the spring is connected to the second valve core 40, so that the expansion and contraction of the spring can realize the state of the first valve core 30 keeping the second valve core 40 open or closing, and the expansion and contraction process is flexible, and the spring causes the second blocking member 32 and the first through hole 22 to achieve sealing).
[0044] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.
Claims
1. A normally open three-way solenoid valve, characterized in that: include, A valve seat, wherein a valve cavity is provided in the valve seat, a first channel is provided at the bottom end of the valve cavity, and a second channel and a third channel are provided at the side of the valve cavity; A valve core assembly, comprising a valve body, a first valve core, a second valve core and an elastic component, wherein the valve body is installed in the valve cavity, the valve body is provided with a guide cavity, a first through hole and a second through hole, the first valve core and the second valve core are both installed in the guide cavity and are distributed up and down, the outer wall of the first valve core and the inner wall of the guide cavity are spaced to form a guide gap; the outer wall of the second valve core and the inner wall of the guide cavity are sealed and matched; a guide channel communicating with the first channel is provided inside the second valve core; the elastic component is connected between the first valve core and the second valve core, the elastic component is used to provide an elastic stress, the elastic stress is used to drive the first valve core away from the guide channel to open the guide channel and close the first through hole; the first through hole and the second through hole are distributed up and down, the first through hole is passed through to the top of the first valve core and communicated with the guide cavity, the second channel is located between the first valve core and the second valve core and communicated with the guide cavity; The second channel and the third channel are spaced apart in the height direction of the valve body; A magnet assembly, the magnet assembly includes a fixed iron, a coil group, a moving iron and a connecting rod, the fixed iron and the coil group are fixedly connected to the valve body, the moving iron is arranged above the fixed iron and penetrates the coil group, and the connecting rod is movably connected to the fixed iron; the top end of the connecting rod is penetrated by the fixed iron and connected to the moving iron, and the bottom end of the connecting rod is penetrated by the fixed iron and connected to the first valve core, and the moving iron is used to drive the first valve core to move downward when the coil group is energized; the outside of the moving iron is covered with a magnetic isolation tube.
2. The normally open three-way solenoid valve according to claim 1, characterized in that: The magnetic isolation tube is fixedly connected to the valve seat and extends out from the top of the valve seat; the moving iron is movably connected to the magnetic isolation tube; and a buffer is arranged on the top of the moving iron.
3. The normally open three-way solenoid valve according to claim 2, characterized in that: The buffer component is a plastic buffer component.
4. The normally open three-way solenoid valve according to claim 2, characterized in that: The magnet assembly also includes a coil seat, which is fixed to the top of the valve seat. The coil group is wound inside the coil seat. The magnetic isolation tube is fixed to the coil seat and extends from the top of the coil seat.
5. The normally open three-way solenoid valve according to any one of claims 1 to 4, characterized in that: The middle portion of the valve body is sealed and matched with the inner wall of the valve cavity through a first sealing ring.
6. The normally open three-way solenoid valve according to any one of claims 1 to 4, characterized in that: The outer peripheral wall of the second valve core and the inner wall of the flow guide cavity are sealed together through a second sealing ring.
7. The normally open three-way solenoid valve according to any one of claims 1 to 4, characterized in that: A first blocking piece is provided at the bottom end of the first valve core, and the first blocking piece is used to block the guide channel; the first blocking piece is made of elastic rubber material.
8. The normally open three-way solenoid valve according to any one of claims 1 to 4, characterized in that: A second blocking piece is disposed at the top end of the first valve core, and the second blocking piece is made of elastic rubber material.
9. The normally open three-way solenoid valve according to any one of claims 1 to 4, characterized in that: The elastic component is a spring, one end of the spring is connected to the first valve core, and the other end of the spring is connected to the second valve core.