CN220268588U - Dynamic pressure-reducing electromagnetic valve - Google Patents
Dynamic pressure-reducing electromagnetic valve Download PDFInfo
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- CN220268588U CN220268588U CN202322324165.1U CN202322324165U CN220268588U CN 220268588 U CN220268588 U CN 220268588U CN 202322324165 U CN202322324165 U CN 202322324165U CN 220268588 U CN220268588 U CN 220268588U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 174
- 230000001603 reducing effect Effects 0.000 claims abstract description 30
- 239000008358 core component Substances 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 230000006837 decompression Effects 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Magnetically Actuated Valves (AREA)
Abstract
The utility model discloses a dynamic pressure reducing electromagnetic valve, which comprises a valve body, wherein a water inlet and a water passing port are formed at two ends of the valve body, and a water passing channel is arranged between the water inlet and the water passing port; the valve body is provided with a first valve body and a second valve body; the first valve body comprises a coil assembly and an electromagnetic valve head, and the electromagnetic valve head is driven by the coil assembly to open and close the water channel; the second valve body comprises a valve cover, a valve sleeve and a valve core assembly; one end of the valve sleeve is connected with the water passing port, the other end of the valve sleeve is connected with the valve cover, a cavity is formed in the valve sleeve, and a water outlet is circumferentially arranged; the valve core component is arranged in the cavity through the elastic piece, and a water passing gap is formed between the valve core component and the valve sleeve; the elastic piece is compressed by the water flow pressure entering the second valve body to enable the valve core assembly to translate relative to the valve sleeve, so that the size of a water passing gap is changed, and the automatic adjustment of the water flow pressure of the water outlet is realized. The utility model can dynamically adjust the water flow which is continuously changed so as to provide more stable opening and closing and decompression effects.
Description
Technical Field
The utility model relates to the technical field of electromagnetic valves, in particular to a dynamic pressure reducing electromagnetic valve.
Background
The pressure reducing valve is a valve which reduces the inlet pressure to a certain required outlet pressure through self regulation and automatically keeps the outlet pressure stable. From the viewpoint of hydrodynamics, the pressure reducing valve is a throttling device, namely, the flow speed and the kinetic energy of fluid are changed by changing the throttling area, so that different pressure losses are caused, and the aim of reducing pressure is achieved. And then, by means of the adjustment of the control and adjustment system, the fluctuation behind the valve is balanced with the force of the elastic piece, so that the pressure behind the valve is kept constant within a certain error range. Solenoid valves are industrial equipment that are solenoid controlled and are the automated basic components used to control fluids.
The existing electromagnetic valve only has an opening/closing function and has no decompression function, and when the electromagnetic valve is matched with a decompression valve, the electromagnetic valve can only be used for decompressing when the fluid pressure is constant, and when the fluid pressure is continuously changed, the existing electromagnetic valve is matched with the decompression valve, so that the use requirement cannot be met.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model aims to provide a dynamic pressure reducing electromagnetic valve which can dynamically regulate water flow which is continuously changed, so that the water flow pressure of a water outlet is kept constant, and a more stable opening, closing and pressure reducing effect is provided.
The utility model adopts the following technical scheme:
the dynamic pressure reducing electromagnetic valve comprises a valve body, wherein a water inlet and a water passing port are respectively formed at two ends of the valve body, and a water passing channel is formed between the water inlet and the water passing port; the valve body is provided with a first valve body and a second valve body;
the first valve body is arranged close to the water inlet and comprises a coil assembly and an electromagnetic valve head, and the electromagnetic valve head is driven to be far away from or close to the water passing channel through the coil assembly, so that the water passing channel is opened or closed;
the second valve body is arranged at the water passing port and comprises a valve cover, a valve sleeve and a valve core assembly; one end of the valve sleeve is connected with the water passing port, the other end of the valve sleeve is connected with the valve cover, a cavity is formed in the valve sleeve, a water outlet is circumferentially arranged in the valve sleeve, the valve core assembly is arranged in the cavity through an elastic piece, and a water passing gap is formed between the valve core assembly and the valve sleeve; the elastic piece is compressed by the water flow pressure entering the second valve body to enable the valve core assembly to translate relative to the valve sleeve, so that the size of the water passing gap is changed, and the automatic adjustment of the water flow pressure of the water outlet is realized.
In an alternative embodiment, the water passing port is provided with a guide groove;
the valve core assembly comprises a valve core main body and a connecting seat; one end of the connecting seat is fixed with the valve core main body, and the other end of the connecting seat is connected with the valve cover through the elastic piece; the valve core main body is far away from one end of the connecting seat to form a guide column, and the guide column is sleeved in the guide groove.
In an alternative embodiment, the inner wall of the valve sleeve is provided with a flange;
the surface of the valve core main body, which is close to the flange, is circumferentially provided with a conical surface; the distance between the flange and the surface of the conical surface is changed through the displacement of the valve core assembly, so that the size of the water gap between the flange and the conical surface is changed.
In an alternative embodiment, the valve core main body is coaxially arranged with the valve sleeve, the elastic member and the water passing port.
In an alternative embodiment, a sealing gasket is arranged between the valve cover and the valve sleeve, and the sealing gasket divides the cavity into a first cavity and a second cavity; the valve cover surface is provided with the through hole, the through hole UNICOM first cavity and outside.
In an alternative embodiment, the valve further comprises a connecting piece, wherein the connecting piece sequentially penetrates through the valve core main body, the sealing gasket and the connecting seat, and the sealing gasket is clamped between the valve core main body and the connecting seat.
In an alternative embodiment, an annular groove is arranged at the joint of the valve sleeve and the water passing port, and a sealing ring is arranged in the annular groove.
In an alternative embodiment, an orifice and an adjusting block are arranged between the water outlet and the cavity; the regulating block is linked with the valve core component; and the displacement of the valve core assembly drives the coverage area of the regulating block on the throttling hole, so that the water flow pressure of the water outlet is regulated.
In an alternative embodiment, the water passing channel comprises a first water passing channel, a second water passing channel and a third water passing channel which are sequentially communicated, the first water passing channel is arranged close to the water inlet, the second water passing channel is formed in the first valve body, and the third water passing channel is arranged close to the water passing port; the second water passing channel forms a certain angle with the first water passing channel and the second water passing channel.
In an alternative embodiment, a filter is arranged between the first water passing channel and the second water passing channel;
the water inlet is provided with a quick pipe joint.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides a dynamic pressure reducing electromagnetic valve, which compresses an elastic piece through the pressure of water flow entering a second valve body to enable a valve core assembly to translate relative to a valve sleeve, so that the size of a water passing gap is changed; when the kinetic energy of the entering water flow is large, the elastic piece receives larger compression force, so that the valve core assembly moves towards the compression direction of the elastic piece, at the moment, the water gap is reduced, and the decompression effect on the water flow is improved; when the kinetic energy of the entering water flow is smaller, the elastic piece is stressed less, the valve core assembly moves towards the spring piece ejecting direction under the action of the elastic force, at the moment, the water gap is increased, and the decompression effect on the water flow is reduced; the dynamic pressure reducing solenoid valve of the embodiment adjusts the water gap by the kinetic energy of the entering water flow, realizes real-time adjustment of the water pressure, can dynamically control the output water pressure without frequently switching the pressure reducing valve under the condition that the water pressure facing the original water flow is continuously changed, ensures that the water pressure of the water outlet is always kept constant, and provides more stable opening and closing and pressure reducing effects.
Drawings
Fig. 1 is a perspective view of a dynamic pressure reducing solenoid valve of embodiment 1;
FIG. 2 is a top view of the dynamic pressure relief solenoid valve of example 1;
FIG. 3 is a cross-sectional view of the A-A side of the dynamic pressure relief solenoid valve of example 1;
FIG. 4 is a B-B side sectional view of the dynamic pressure reducing solenoid valve of example 1;
fig. 5 is a schematic structural view of a valve body of the dynamic pressure reducing solenoid valve of embodiment 1;
FIG. 6 is a schematic structural view of a valve housing of the dynamic pressure reducing solenoid valve of example 1;
FIG. 7 is a schematic diagram showing the connection structure of the valve housing and the valve core assembly of the dynamic pressure reducing solenoid valve of example 1;
fig. 8 is a schematic structural view of a valve body of the dynamic pressure reducing solenoid valve of embodiment 1.
In the figure: 10. a valve body; 11. a water inlet; 12. a water passing port; 121. a guide groove; 13. a water passing channel; 14. a filter; 15. a quick pipe joint; 20. a first valve body; 21. a coil assembly; 22. an electromagnetic valve head; 30. a second valve body; 31. a valve cover; 311. a through hole; 32. a valve sleeve; 321. a water outlet; 322. a flange; 323. an annular groove; 3231. a seal ring; 324. an orifice; 33. a valve core assembly; 331. a valve core main body; 3311. a guide post; 3312. a conical surface; 332. a connecting seat; 34. an elastic member; 35. and a sealing gasket.
Detailed Description
The present utility model will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments. Materials and equipment used in this example are commercially available, except as specifically noted. Examples of such embodiments are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements throughout or elements having like or similar functionality. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and are therefore not to be construed as limiting the present application. In the description of the present application, the meaning of "a plurality" is two or more, unless specifically stated otherwise.
In the description of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, or connected via an intermediary, or may be a connection between two elements or an interaction relationship between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1:
referring to fig. 1-8, a dynamic pressure reducing electromagnetic valve comprises a valve body 10, wherein a water inlet 11 and a water outlet 12 are respectively formed at two ends of the valve body 10, and a water passing channel 13 which can enable water to smoothly pass through is arranged between the water inlet 11 and the water outlet 12; the valve body 10 is provided with a first valve body 20 and a second valve body 30 communicating with the water passage 13.
The first valve body 20 is arranged close to the water inlet 11, the first valve body 20 comprises a coil assembly 21 and an electromagnetic valve head 22, and the electromagnetic valve head 22 is driven by the coil assembly 21 to be far away from or close to the water passing channel 13, so that the opening and closing of the water passing channel 13 are controlled.
In this embodiment, the water channel 13 includes a first water channel, a second water channel and a third water channel that are sequentially communicated, where the first water channel is disposed near the water inlet 11, the second water channel is formed inside the first valve body 20, and the third water channel is disposed near the water outlet 12; wherein a filter element 14 is arranged between the first water passing channel and the second water passing channel; the filtering element 14 can be composed of a plurality of groups of criss-cross steel wires, and is beneficial to reducing the kinetic energy of water flow and preliminarily decompressing the water flow when filtering the water flow entering the valve body.
The second water channel forms certain angle with first water channel, second water channel, through setting up water channel 13 angle, changes the rivers direction, reduces rivers kinetic energy, reaches the decompression effect. The water inlet 11 is provided with a quick coupler 15 for connection with a water inlet pipe or the like.
The second valve body 30 is arranged at the water passing port 12 and is fixedly connected with the valve body 10 in a threaded or fastening manner; further, an annular groove 323 is formed in the surface of the joint of the second valve body 30 and the water outlet 12, and a sealing ring 3231 is arranged in the annular groove 323; the second valve body 30 is sealingly connected to the valve body 10 by the seal ring 3231 being deformed by compression during connection.
Specifically, the second valve body 30 includes a valve cover 31, a valve sleeve 32, and a valve core assembly 33; one end of the valve sleeve 32 is connected with the water passing port 12, the other end of the valve sleeve 32 is connected with the valve cover 31, a cavity is formed in the valve sleeve, a water outlet 321 is formed in the circumferential direction of the valve sleeve 32, and a flange 322 is arranged on the inner wall of the valve sleeve 32; the valve cover 31 covers one end of the valve sleeve 32 far away from the water passing port 12; the valve core assembly 33 is arranged in the cavity, an elastic piece 34 is arranged between the valve core assembly 33 and the valve cover 31, and the elastic piece 34 in the embodiment is a spring; a water gap is formed between the valve core assembly 33 and the valve sleeve 32; compressing the elastic member 34 by the pressure of the water flow entering the second valve body 30 translates the valve core assembly 33 relative to the valve sleeve 32, thus changing the water gap size; when the kinetic energy of the entering water flow is large, the elastic piece 34 receives larger compression force, so that the valve core assembly 33 moves towards the compression direction of the elastic piece 34, at the moment, the water gap is reduced, and the decompression effect on the water flow is improved; when the kinetic energy of the entering water flow is smaller, the elastic piece 34 is stressed less, the valve core assembly 33 moves towards the ejection direction of the elastic piece 34 under the action of the elastic force, at the moment, the water gap is increased, and the decompression effect on the water flow is reduced; the dynamic pressure reducing solenoid valve in this embodiment adjusts the water gap by the kinetic energy of the entering water flow, so as to realize real-time adjustment of the water pressure, and can dynamically control the output water pressure without frequently switching the pressure reducing valve under the condition that the water pressure facing the original water flow is continuously changed, so that the water pressure of the water outlet 321 is always kept constant.
Specifically, the water passing port 12 is provided with a guide groove 121; the spool assembly 33 includes a spool body 331 and a connection seat 332 connected to each other. The connecting seat 332 is circumferentially provided with a supporting part; the elastic member 34 is sleeved on the surface of the connecting seat 332, one end of the elastic member is fixed to the supporting portion, and the other end of the elastic member is supported by the valve cover 31.
The valve core main body 331 forms a guiding post 3311 at one end far away from the connecting seat 332, the guiding post 3311 is sleeved in the guiding groove 121, and the direction of the guiding groove 121 is consistent with the elastic direction of the elastic piece 34. By the cooperation of the guide post 3311 and the guide groove 121, the displacement of the elastic member 34 of the valve element assembly 33 in the elastic direction is more stable and reliable. Of course, a limiting piece can be arranged at the contact position of the guide groove 121 and the guide post 3311 to limit the excessive displacement of the valve core assembly 33 and control the limit size of the water gap.
Further, the guide groove 121 is a cylindrical groove, the guide post 3311 is in a hexagonal prism structure, and a gap is formed between the guide groove 121 and the guide post 3311 by matching the hexagonal prism with the cylindrical groove, so that a space formed between the end of the guide post 3311 and the inside of the guide groove 121 is communicated with the cavity inside the valve sleeve 32, and the movement of the valve core assembly 33 is prevented from being influenced by the formation of pressure difference.
The valve core main body 331 and the flange 322 of the inner wall of the valve sleeve 32 form a conical surface 3312 along the circumferential direction; the distance between the flange 322 and the surface of the conical surface 3312 is changed by the displacement of the valve core assembly 33, so that the size of the water gap between the flange 322 and the conical surface 3312 is changed, namely, the larger the radial section radius of the flange 322 corresponding to the conical surface 3312 is, the smaller the distance between the flange 322 and the conical surface 3312 is, the smaller the water gap area is, and the pressure reducing effect is larger. The valve core main body 331 is coaxially arranged with the valve sleeve 32, the elastic member 34 and the water passing port 12, thereby improving the utilization rate of acting force and improving the sensitivity of dynamic adjustment.
In some preferred embodiments, a sealing gasket 35 and a connecting piece are arranged between the valve cover 31 and the valve sleeve 32, and the sealing gasket 35 in the embodiment is a disc-shaped gasket; the connecting piece of the embodiment is a screw; the connecting piece sequentially passes through the valve core main body 331, the sealing gasket 35 and the connecting seat 332, the sealing gasket 35 is clamped between the valve core main body 331 and the connecting seat 332, and the peripheral edge of the sealing gasket 35 is clamped between the valve cover 31 and the valve sleeve 32, so that the cavity is divided into a first cavity and a second cavity; the first chamber is specifically a space formed between the sealing gasket 35 and the valve cover 31, and the second chamber is a space between the sealing gasket 35 and the valve sleeve 32; the surface of the valve cover 31 is provided with a through hole 311, and the through hole 311 is communicated with the first chamber and the outside, so that the first chamber is communicated with the atmosphere, and the expansion efficiency of the first chamber is improved.
Further, an orifice 324 and an adjusting block are arranged between the water outlet 321 and the cavity; the regulating block is linked with the valve core assembly 33; the displacement of the valve core assembly 33 drives the coverage area of the regulating block on the throttle hole 324, so that the water flow pressure of the water outlet 321 is further regulated. When water flows into the valve body 10 through the water inlet 11, the electromagnetic valve head 22 is opened, the water flows into the second valve body 30, when the water inflow is smaller, the water flows into the second chamber through the water gap, and flows out of the water outlet 321, and the valve core assembly 33 does not act at the moment; when the inflow is larger, the water is throttled by the throttle hole 324, and then the water flows through the water gap to compress the elastic piece 34 to drive the valve core assembly 33 to move leftwards, so that the cross-sectional area of the water gap is reduced, the water flow entering the second chamber is reduced, and the pressure of the water outlet 321 is reduced.
Although only certain elements and embodiments of the present application have been illustrated and described, many modifications and changes (e.g., variations in size, dimensions, structure, shape and proportions of the various elements, mounting arrangements, use of materials, colors, orientations, etc.) may be suggested to those skilled in the art without actually departing from the scope and spirit of the appended claims.
Finally, it should be noted that: the above embodiments are only preferred embodiments of the present utility model, and should not be construed as limiting the scope of the present utility model, and any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.
Claims (10)
1. The dynamic pressure reducing electromagnetic valve is characterized by comprising a valve body, wherein a water inlet and a water passing port are respectively formed at two ends of the valve body, and a water passing channel is formed between the water inlet and the water passing port; the valve body is provided with a first valve body and a second valve body;
the first valve body is arranged close to the water inlet and comprises a coil assembly and an electromagnetic valve head, and the electromagnetic valve head is driven to be far away from or close to the water passing channel through the coil assembly, so that the water passing channel is opened or closed;
the second valve body is arranged at the water passing port and comprises a valve cover, a valve sleeve and a valve core assembly; one end of the valve sleeve is connected with the water passing port, the other end of the valve sleeve is connected with the valve cover, a cavity is formed in the valve sleeve, a water outlet is circumferentially arranged in the valve sleeve, the valve core assembly is arranged in the cavity through an elastic piece, and a water passing gap is formed between the valve core assembly and the valve sleeve; the elastic piece is compressed by the water flow pressure entering the second valve body to enable the valve core assembly to translate relative to the valve sleeve, so that the size of the water passing gap is changed, and the water flow pressure of the water outlet is adjusted.
2. The dynamic pressure reducing solenoid valve as set forth in claim 1 wherein said water passing port is provided with a guide groove;
the valve core assembly comprises a valve core main body and a connecting seat; one end of the connecting seat is fixed with the valve core main body, and the other end of the connecting seat is connected with the valve cover through the elastic piece; the valve core main body is far away from one end of the connecting seat to form a guide column, and the guide column is sleeved in the guide groove.
3. A dynamic pressure relief solenoid valve according to claim 2 wherein said valve housing inner wall is provided with a flange;
the surface of the valve core main body, which is close to the flange, is circumferentially provided with a conical surface; the distance between the flange and the surface of the conical surface is changed through the displacement of the valve core assembly, so that the size of the water gap between the flange and the conical surface is changed.
4. A dynamic pressure relief solenoid valve according to claim 3 wherein said valve body is coaxially disposed with said valve sleeve, spring, and water port.
5. A dynamic pressure relief solenoid valve according to claim 3 wherein a sealing gasket is disposed between said valve cover and said valve sleeve, said sealing gasket dividing said cavity into a first chamber and a second chamber; the valve cover surface is provided with the through hole, the through hole UNICOM first cavity and outside.
6. The dynamic pressure reducing solenoid valve according to claim 5, further comprising a connector passing through the valve body, the sealing gasket, and the connecting seat in order, the sealing gasket being clamped between the valve body and the connecting seat.
7. A dynamic pressure reducing solenoid valve as set forth in claim 3 wherein said valve sleeve and said water port are provided with annular grooves in which sealing rings are provided.
8. The dynamic pressure reducing solenoid valve as set forth in claim 1 wherein an orifice and an adjusting block are disposed between the water outlet and the cavity; the regulating block is linked with the valve core component; and the displacement of the valve core assembly drives the coverage area of the regulating block on the throttling hole, so that the water flow pressure of the water outlet is regulated.
9. The dynamic pressure reducing solenoid valve according to claim 1, wherein the water passage comprises a first water passage, a second water passage and a third water passage which are communicated in sequence, the first water passage is arranged close to the water inlet, the second water passage is formed in the first valve body, and the third water passage is arranged close to the water outlet; the second water passing channel forms a certain angle with the first water passing channel and the second water passing channel.
10. The dynamic pressure reducing solenoid valve as set forth in claim 9 wherein a filter is disposed between said first water passage and said second water passage; the water inlet is provided with a quick pipe joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322324165.1U CN220268588U (en) | 2023-08-28 | 2023-08-28 | Dynamic pressure-reducing electromagnetic valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322324165.1U CN220268588U (en) | 2023-08-28 | 2023-08-28 | Dynamic pressure-reducing electromagnetic valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220268588U true CN220268588U (en) | 2023-12-29 |
Family
ID=89312357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322324165.1U Active CN220268588U (en) | 2023-08-28 | 2023-08-28 | Dynamic pressure-reducing electromagnetic valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220268588U (en) |
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2023
- 2023-08-28 CN CN202322324165.1U patent/CN220268588U/en active Active
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