CN219796240U - Novel air-fuel ratio valve and combustion pipeline - Google Patents
Novel air-fuel ratio valve and combustion pipeline Download PDFInfo
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- CN219796240U CN219796240U CN202321299862.XU CN202321299862U CN219796240U CN 219796240 U CN219796240 U CN 219796240U CN 202321299862 U CN202321299862 U CN 202321299862U CN 219796240 U CN219796240 U CN 219796240U
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- 239000000446 fuel Substances 0.000 title claims abstract description 22
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 129
- 230000001105 regulatory effect Effects 0.000 claims abstract description 89
- 239000002737 fuel gas Substances 0.000 claims abstract description 25
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005192 partition Methods 0.000 abstract description 3
- 239000012528 membrane Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
The utility model discloses a novel air-fuel ratio valve and a combustion pipeline, and in a first aspect, the novel air-fuel ratio valve comprises a valve body, wherein the valve body is internally divided into a fuel gas cavity and a pressure balance cavity by a partition board, the fuel gas cavity is divided into a fuel gas inlet cavity and a fuel gas outlet cavity by a valve core, the pressure balance cavity is divided into an air pressure cavity and a fuel gas pressure cavity by a diaphragm, a first pressure regulating pipeline is arranged on the valve body, an outlet of the first pressure regulating pipeline is positioned in the fuel gas outlet cavity, a second pressure regulating port is arranged on the fuel gas pressure cavity, and a plug is arranged in the fuel gas pressure cavity. The second aspect, a combustion pipeline, including the combustor, the combustor is linked together with the gas exit tube, and the combustor is linked together with the air pipe way, still includes foretell novel air-fuel ratio example valve, and the gas exit tube is linked together with the gas goes out the chamber, and the gas advances the chamber intercommunication and has the gas to advance the pipe, is equipped with the second pressure regulating pipeline on the second pressure regulating mouth. The utility model can ensure the constant air-fuel ratio of the burner under the limited condition of the field.
Description
Technical Field
The utility model relates to the technical field of proportional valves, in particular to a novel air-fuel ratio valve and a combustion pipeline.
Background
The proportioning valve is used for adjusting the downstream pressure of the fuel gas through the pressure of the air inlet pipeline to realize the proportioning of the air and the fuel gas. As shown in fig. 1, in the existing proportional valve, when the pressure P2 of the air pipe increases, the pressure below the diaphragm is greater than the pressure above the diaphragm, the diaphragm moves upward, driving the valve core to move upward, the flow capacity of the proportional valve increases, the outlet pressure P1 thereof increases accordingly, until p1=p2 reaches equilibrium, and under the condition that the upstream gas pressure is sufficient, the valve core is driven to move by the real-time up-down movement of the diaphragm, and the flow area of the gas in the proportional valve is changed, so that the ratio of the outlet gas pressure P1 to the air pressure P2 is controlled to be 1:1, thereby ensuring a constant air/gas ratio entering the downstream burner. The fuel gas downstream pressure sampling points of the proportional valves in the market at present are integrated in the proportional valves, and the positions of the sampling points are basically positioned at the downstream interfaces of the proportional valves. In some practical applications, the installation position of the proportional valve is required to be far away from the burner, the middle pipeline between the outlet of the proportional valve and the gas inlet of the burner is longer, the local resistance is more (such as an elbow, a large head and the like), and the pressure loss delta P is caused by the local resistance 1 And DeltaP 2 Not negligible; and the gas pressure and air pressure at the burner inlet are:
P 1 ′＝P1-ΔP 1
P 2 ′＝P2-ΔP 2
because of DeltaP 1 And delta P 2 The difference is large, and ΔP 1 ≠ΔP 2 Therefore, the pressure of the fuel gas and the air at the inlet of the burner is not in a constant proportion, the proportion is not regulated, and the burner cannot achieve an ideal combustion effect.
Disclosure of Invention
The utility model aims to provide a novel air-fuel ratio valve and a combustion pipeline, which can ensure a constant air-fuel ratio of a burner under a limited field state.
In order to solve the technical problems, the utility model adopts the following scheme:
in a first aspect, a novel air-fuel ratio valve comprises a valve body, wherein a gas cavity for gas to pass through and a pressure balance cavity for air to pass through are formed in the valve body by a partition plate, the gas cavity is divided into a gas inlet cavity for inputting gas and a gas outlet cavity for discharging gas to a combustor by a valve core, the pressure balance cavity is divided into an air pressure cavity for communicating with an air pipeline and a gas pressure cavity for communicating with the gas outlet cavity by a diaphragm, a first pressure regulating pipeline for communicating the gas pressure cavity with the gas outlet cavity through the valve body is arranged on the valve body, an outlet of the first pressure regulating pipeline is positioned in the gas outlet cavity, the diaphragm is connected with the valve core, the diaphragm is pushed to move towards the gas pressure cavity by air under the condition that the pressure in the air pressure cavity is larger than the pressure in the gas pressure cavity, the valve core is driven by the diaphragm to move upwards, so that the flow area between the gas inlet cavity and the gas outlet cavity is increased, the gas pressure cavity is increased, and the gas pressure cavity is increased until balance is reestablished. The gas pressure cavity is provided with a second pressure regulating port, the second pressure regulating port is used for installing a second pressure regulating pipeline which is used for directly communicating the gas pressure cavity with the gas outlet pipe, a plug which is used for plugging the first pressure regulating pipeline or the second pressure regulating port is arranged in the gas pressure cavity, and the plug is detachable. The device has the advantages that through the arrangement of the second pressure regulating pipeline and the plug, when the proportional valve is limited, the middle pipeline between the proportional valve outlet and the gas inlet of the burner is longer in layout, namely, when the length of the gas outlet pipe is longer, the plug is used for blocking the first pressure regulating pipeline, the second pressure regulating port is opened, air is directly communicated with the gas outlet pipe through the second pressure regulating pipeline, the distance between the outlet of the second pressure regulating pipeline and the burner is smaller than that between the outlet of the first pressure regulating pipeline and the burner, and therefore, the pressure loss caused by the second pressure regulating pipeline is smaller than that caused by the first pressure regulating pipeline, so that the burner is beneficial to ensuring a constant air-fuel ratio.
Further, a counter bore for installing the plug is arranged in the valve body and is communicated with the first pressure regulating pipeline, the counter bore is positioned at the end part of the first pressure regulating pipeline in the fuel gas pressure cavity, and the inner diameter of the counter bore is the same as the inner diameter of the second pressure regulating pipeline. The plug is used for plugging the first pressure regulating pipeline and the second pressure regulating pipeline through the arrangement of the counter bore.
Further, the counter bore is in interference fit with the plug. The plug is used for guaranteeing the air tightness of the plug to the first pressure regulating pipeline and the second pressure regulating pipeline.
Further, an air inlet is arranged on the air pressure cavity and used for installing an air inlet pipe which is used for communicating the air pressure cavity with the air pipeline.
Furthermore, a valve core reset spring used for balancing the position of the valve core and preventing overshoot is arranged in the gas outlet cavity, and a diaphragm reset spring used for balancing the position of the valve core and preventing overshoot is arranged in the air pressure cavity. And under the condition that the air pressure at the junction between the air inlet pipe and the air pipeline is equal to the air pressure at the junction between the first pressure regulating pipeline or the second pressure regulating pipeline in a communicating state and the fuel gas outlet pipe, the valve core reset spring and the diaphragm reset spring are in an original length state.
The second aspect, a combustion pipeline, including the combustor, the combustor is linked together with the gas exit tube, and the combustor is linked together with the air duct, still includes foretell novel air-fuel ratio example valve, and the gas exit tube is linked together with the gas out the chamber, and the gas advances the chamber intercommunication and has the gas to advance the pipe, is equipped with the second pressure regulating pipeline with gas pressure chamber and gas exit tube direct intercommunication on the second pressure regulating mouth.
Further, one end of the second pressure regulating pipeline, which is far away from the gas pressure cavity, is arranged on the gas outlet pipe and is close to the burner. The function is that the pressure loss delta P between the outlet of the second pressure regulating pipeline on the gas outlet pipe and the burner can be effectively reduced 1 。
Further, the inner diameter of the second pressure regulating pipeline is smaller than the inner diameter of the fuel gas outlet pipe. This has the effect that the loss of pressure in the second pressure regulating line can be reduced as much as possible.
Further, the air pressure cavity is provided with an air inlet, and the air inlet is provided withAnd one end of the air inlet pipe, which is far away from the air pressure cavity, is arranged on the air pipeline and is close to the burner. The function is that the pressure loss delta P between the outlet of the air inlet pipe on the air pipeline and the burner can be effectively reduced 2 。
Further, the inner diameter of the air inlet pipe is smaller than the inner diameter of the air pipeline. The effect is to reduce the pressure loss in the air inlet pipe as much as possible.
The utility model has the beneficial effects that:
1. by adding a downstream gas pressure taking port (namely an outlet of the second pressure regulating pipeline on the gas outlet pipe) which can be externally connected to the proportional valve, when the mounting position of the proportional valve is limited and the burner gas inlet is required to be far away, the gas pressure at the proper position downstream of the proportional valve can be led into the position below the diaphragm of the proportional valve to balance the pressure of an air pressure taking point (namely the inlet of the air inlet pipe on the air pipeline), so that the position of the downstream gas pressure taking point can be matched with the position of the air pressure taking point, and better air/gas ratio control is realized;
2. the detachable plugs are arranged at the built-in pressure taking port (namely the inlet of the first pressure regulating pipeline at the gas pressure cavity) and the external pressure taking port (namely the inlet of the second pressure regulating pipeline at the gas pressure cavity) of the proportional valve, so that the use flexibility of the proportional valve is enhanced, if the proportional valve is properly arranged on the gas pipeline, the built-in pressure taking port of the proportional valve is used for directly leading the gas pressure at the outlet of the proportional valve, otherwise, the external pressure taking port of the proportional valve is used for leading the gas pressure at the proper position on the gas pipeline;
3. in the case of an improper installation position of the proportional valve on site, which results in an imbalance of the air/gas ratio, a rapid modification can also be carried out in this way.
Drawings
FIG. 1 is a schematic view of a prior art combustion line;
FIG. 2 is a schematic view of the structure of the combustion line in example 1;
fig. 3 is an enlarged schematic view of the structure at a in fig. 2.
Reference numerals: 1. a valve body; 2. a gas cavity; 3. a pressure balancing chamber; 4. a valve core; 5. gas enters the cavity; 6. the fuel gas is discharged from the cavity; 7. a membrane; 8. an air duct; 9. an air pressure chamber; 10. a gas pressure chamber; 11. a first pressure regulating pipeline; 12. a second pressure regulating port; 13. a plug; 14. countersink; 15. an air inlet pipe; 16. a valve core return spring; 17. a diaphragm return spring; 18. a fuel gas inlet pipe; 19. a fuel gas outlet pipe; 20. a second pressure regulating pipeline; 21. a burner; 22. an air inlet.
Detailed Description
The present utility model will be described in further detail with reference to examples and drawings, but embodiments of the present utility model are not limited thereto.
In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and for simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be construed as limiting the present utility model.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "configured," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Example 1
In a first aspect, as shown in fig. 3, a novel air-fuel ratio valve comprises a valve body 1, wherein the valve body 1 is divided into a gas cavity 2 for gas to pass through and a pressure balance cavity 3 for balancing pressure by a partition plate, the gas cavity 2 is divided into a gas inlet cavity 5 for inputting gas and a gas outlet cavity 6 for discharging gas to a combustor 21 by a valve core 4, the pressure balance cavity 3 is divided into an air pressure cavity 9 for communicating with an air pipeline 8 and a gas pressure cavity 10 for communicating with the gas outlet cavity 6 by a membrane 7, a first pressure regulating pipeline 11 penetrating through the valve body 1 and communicating the gas pressure cavity 10 with the gas outlet cavity 6 is arranged on the valve body 1, an outlet of the first pressure regulating pipeline 11 is positioned in the gas outlet cavity 6, the membrane 7 is connected with the valve core 4, the membrane 7 is pushed by air to move towards the gas pressure cavity in a state that the pressure in the air pressure cavity 9 is higher than the pressure in the gas pressure cavity 10, the membrane 7 drives the valve core 4 to move upwards, so that the flow area of the gas inlet cavity 5 and the gas outlet cavity 6 is increased, the pressure of the gas outlet cavity 6 is increased, and the pressure of the gas outlet cavity 9 is increased until the pressure of the membrane is reestablished. The gas pressure cavity 10 is provided with a second pressure regulating port 12, the second pressure regulating port 12 is used for installing a second pressure regulating pipeline 20 which directly communicates the gas pressure cavity 10 with a gas outlet pipe 19, and a plug 13 which is used for plugging the first pressure regulating pipeline 11 or the second pressure regulating port 12 is arranged in the gas pressure cavity 10. The effect is that through the setting of second pressure regulating pipeline 20 and end cap 13, when the installation of proportional valve is restricted, make the intermediate pipeline overall arrangement between proportional valve export and the combustor 21 gas entry longer, namely when the length of gas exit tube 19 is longer, use end cap 13 to block up first pressure regulating pipeline 11, open second pressure regulating mouth 12, make the air be linked together with gas exit tube 19 directly through second pressure regulating pipeline 20, make the distance between the exit of second pressure regulating pipeline 20 and the combustor 21 be less than the exit of first pressure regulating pipeline 11 and the distance between the combustor 21, consequently, the pressure loss that brings through second pressure regulating pipeline 20 is less than the pressure loss that first pressure regulating pipeline 11 brought, be favorable to making combustor 21 guarantee invariable air-fuel ratio.
Specifically, as shown in fig. 3, a counter bore 14 for installing the plug 13 is provided in the valve body 1, the counter bore 14 is communicated with the first pressure regulating pipeline 11, the counter bore 14 is located at the end part of the first pressure regulating pipeline 11 in the gas pressure cavity 10, and the inner diameter of the counter bore 14 is the same as the inner diameter of the second pressure regulating pipeline 20. The function of the plug is that the plug 13 can plug the first pressure regulating pipeline 11 and the second pressure regulating pipeline 20 through the arrangement of the counter bore 14.
Specifically, as shown in fig. 3, the counterbore 14 is in interference fit with the plug 13. The plug 13 can ensure the air tightness of the first pressure regulating pipeline 11 and the second pressure regulating pipeline 20.
Specifically, as shown in fig. 3, the air pressure chamber 9 is provided with an air inlet 22, and the air inlet 22 is used for installing an air inlet pipe 15 for communicating the air pressure chamber 9 with the air pipeline 8.
Specifically, as shown in fig. 3, a spool return spring 16 for balancing the position of the spool 4 and preventing overshoot is provided in the gas outlet chamber 6, and a diaphragm return spring 17 for balancing the position of the spool 4 and preventing overshoot is provided in the air pressure chamber 9. In a state where the air pressure at the junction between the air inlet pipe 15 and the air pipe 8 is equal to the air pressure at the junction of the first pressure regulating pipe 11 or the second pressure regulating pipe 20 in the communication state and the gas outlet pipe 19, both the spool return spring 16 and the diaphragm return spring 17 are in the original length state.
In a second aspect, as shown in fig. 2, a combustion pipeline includes a combustor 21, the combustor 21 is communicated with a gas outlet pipe 19, the combustor 21 is communicated with an air pipeline 8, and the novel air-fuel ratio valve is further included, the gas outlet pipe 19 is communicated with a gas outlet cavity 6, the gas inlet cavity 5 is communicated with a gas inlet pipe 18, and a second pressure regulating pipeline 20 for directly communicating the gas pressure cavity 10 with the gas outlet pipe 19 is arranged on a second pressure regulating port 12. The burner 21 is a burner, and is conventional in the art.
Specifically, as shown in fig. 2, an end of the second pressure regulating pipe 20 away from the gas pressure chamber 10 is disposed on the gas outlet pipe 19 adjacent to the burner 21. This effectively reduces the pressure loss Δp1 between the outlet of the second pressure regulating pipe 20 at the gas outlet pipe 19 and the burner 21.
Specifically, as shown in fig. 2, the second pressure regulating pipe 20 has an inner diameter smaller than that of the gas outlet pipe 19. This serves to reduce the loss of pressure in the second pressure regulating line 20 as much as possible.
Specifically, as shown in fig. 2, the air pressure chamber 9 is provided with an air inlet 22, the air inlet 22 is provided with an air inlet pipe 15 for communicating the air pressure chamber 9 with the air pipe 8, and one end of the air inlet pipe 15 away from the air pressure chamber 9 is arranged on the air pipe 8 near the burner 21. This effectively reduces the pressure loss Δp2 between the outlet of the air inlet pipe 15 at the air duct 8 and the burner 21.
Specifically, as shown in fig. 2, the inner diameter of the air inlet pipe 15 is smaller than the inner diameter of the air pipe 8. This serves to reduce the loss of pressure in the air intake duct 15 as much as possible.
The working principle of this embodiment is explained as follows:
in a general occasion, when the proportional valve is not limited by a field, the proportional valve can be arranged near the burner 21, the choke plug 13 is not arranged at the counter bore 14, the choke plug 13 is arranged on the opening of the second pressure regulating channel in the gas pressure cavity 10, and the proportional valve works according to the common working mode of the proportional valve in the prior art;
when the space is limited, namely, the proportional valve is far away from the burner 21, the air pressure cavity 9 and the diaphragm 7 are firstly removed from the gas pressure cavity 10, the plug 13 is blocked on the counter bore 14, the plug 13 is not arranged on the second pressure regulating channel, the diaphragm 7 and the air pressure cavity 9 are sequentially arranged on the gas pressure cavity 10, the second pressure regulating channel is enabled to take pressure from the position close to the inlet of the burner 21, and meanwhile, the air pressure taking port is also enabled to take pressure from the position close to the air inlet of the burner 21, and accordingly, the delta P1 and delta P2 are enabled to be equal to 0, namely, P1 'and P1, P2' are enabled to be equal to P2, so that constant air-fuel ratio is ensured.
The foregoing description of the preferred embodiment of the utility model is not intended to limit the utility model in any way, but rather to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. The utility model provides a novel air-fuel ratio case valve, including valve body (1), be separated into gas chamber (2) that supply the gas to pass through and be used for balancing pressure's pressure balance chamber (3) by the baffle in valve body (1), gas chamber (2) are separated into gas inlet chamber (5) that are used for the input gas and are used for discharging gas to combustor (21) gas outlet chamber (6) by case (4), pressure balance chamber (3) are separated into by diaphragm (7) and are used for the air pressure chamber (9) that are linked together with air duct (8) and are used for the gas pressure chamber (10) that goes out chamber (6) with the gas, be equipped with on valve body (1) and run through valve body (1) with gas pressure chamber (10) and gas outlet chamber (6) be linked together first pressure regulating pipeline (11), the export of first pressure regulating pipeline (11) is located gas outlet chamber (6), diaphragm (7) are connected with case (4), under the state that the pressure in air pressure chamber (9) is greater than the pressure in gas pressure chamber (10), diaphragm (7) are pushed by the air and are moved towards gas pressure chamber (10), diaphragm (7) are moved towards gas chamber (6), diaphragm (7) are moved between its characteristics and are that it is moved to go out, and the area is characterized in that: the gas pressure cavity (10) is provided with a second pressure regulating port (12), the second pressure regulating port (12) is used for installing a second pressure regulating pipeline (20) which is used for directly communicating the gas pressure cavity (10) with a gas outlet pipe (19), and a plug (13) which is used for plugging the first pressure regulating pipeline (11) or the second pressure regulating port (12) is arranged in the gas pressure cavity (10).
2. The novel air-fuel ratio valve according to claim 1, characterized in that: the valve body (1) is internally provided with a counter bore (14) for installing the plug (13), the counter bore (14) is communicated with the first pressure regulating pipeline (11), the counter bore (14) is positioned at the end part of the first pressure regulating pipeline (11) in the gas pressure cavity (10), and the inner diameter of the counter bore (14) is the same as the inner diameter of the second pressure regulating pipeline (20).
3. The novel air-fuel ratio valve according to claim 2, characterized in that: the counter bore (14) is in interference fit with the plug (13).
4. The novel air-fuel ratio valve according to claim 1, characterized in that: an air inlet (22) is arranged on the air pressure cavity (9), and the air inlet (22) is used for installing an air inlet pipe (15) which is used for connecting the air pressure cavity (9) with the air pipeline (8).
5. The novel air-fuel ratio valve according to claim 1, characterized in that: a valve core reset spring (16) used for balancing the position of the valve core (4) and preventing overshoot is arranged in the gas outlet cavity (6), and a diaphragm reset spring (17) used for balancing the position of the valve core (4) and preventing overshoot is arranged in the air pressure cavity (9).
6. The utility model provides a combustion pipeline, includes combustor (21), and combustor (21) are linked together with gas exit tube (19), and combustor (21) are linked together with air pipe (8), its characterized in that: the novel air-fuel ratio valve of any one of claims 1 to 5 is further comprised, wherein the fuel gas outlet pipe (19) is communicated with the fuel gas outlet cavity (6), the fuel gas inlet cavity (5) is communicated with a fuel gas inlet pipe (18), and the second pressure regulating port (12) is provided with a second pressure regulating pipeline (20) which is used for directly communicating the fuel gas pressure cavity (10) with the fuel gas outlet pipe (19).
7. A combustion line as in claim 6, wherein: one end of the second pressure regulating pipeline (20) far away from the gas pressure cavity (10) is arranged on the gas outlet pipe (19) and is close to the burner (21).
8. A combustion line as in claim 7 wherein: the inner diameter of the second pressure regulating pipeline (20) is smaller than the inner diameter of the fuel gas outlet pipe (19).
9. A combustion line as in claim 6, wherein: an air inlet (22) is formed in the air pressure cavity (9), an air inlet pipe (15) for communicating the air pressure cavity (9) with the air pipeline (8) is arranged on the air inlet (22), and one end, far away from the air pressure cavity (9), of the air inlet pipe (15) is arranged on the air pipeline (8) and is close to the burner (21).
10. A combustion line as in claim 9, wherein: the inner diameter of the air inlet pipe (15) is smaller than the inner diameter of the air pipeline (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321299862.XU CN219796240U (en) | 2023-05-26 | 2023-05-26 | Novel air-fuel ratio valve and combustion pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321299862.XU CN219796240U (en) | 2023-05-26 | 2023-05-26 | Novel air-fuel ratio valve and combustion pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219796240U true CN219796240U (en) | 2023-10-03 |
Family
ID=88154763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321299862.XU Active CN219796240U (en) | 2023-05-26 | 2023-05-26 | Novel air-fuel ratio valve and combustion pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219796240U (en) |
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2023
- 2023-05-26 CN CN202321299862.XU patent/CN219796240U/en active Active
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