CN220542149U - Venturi flowmeter - Google Patents
Venturi flowmeter Download PDFInfo
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- CN220542149U CN220542149U CN202322207842.1U CN202322207842U CN220542149U CN 220542149 U CN220542149 U CN 220542149U CN 202322207842 U CN202322207842 U CN 202322207842U CN 220542149 U CN220542149 U CN 220542149U
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- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 238000009792 diffusion process Methods 0.000 claims abstract description 25
- 230000007246 mechanism Effects 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 7
- 230000000087 stabilizing effect Effects 0.000 claims description 24
- 238000004321 preservation Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 3
- 230000008602 contraction Effects 0.000 abstract description 2
- 238000007711 solidification Methods 0.000 description 6
- 230000008023 solidification Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 239000003381 stabilizer Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of flow measurement equipment, in particular to a venturi flowmeter, which comprises an inlet section, a contraction section, a throat and a diffusion section which are sequentially arranged, wherein a first pressure detecting pipe is communicated with the inlet section, a second pressure detecting pipe is communicated with the middle part of the throat, a differential pressure transmitter is communicated between the first pressure detecting pipe and the second pressure detecting pipe, heating jackets are respectively wrapped on the first pressure detecting pipe and the second pressure detecting pipe, a temperature measuring mechanism is arranged on the diffusion section, the temperature measuring mechanism comprises a temperature measuring pipe communicated with the outer side of the diffusion section, a support is arranged in the temperature measuring pipe, and a temperature sensor is arranged at the middle part of the temperature measuring pipe and is arranged on the support, and the detection end of the temperature sensor faces the diffusion section. The utility model provides the Venturi flowmeter which is convenient for calculating the flow of the flowing medium, is convenient for carrying out temperature compensation on the medium in the pressure measuring tube, has high accuracy for measuring the flow of the medium and accurate temperature measurement of the fluid medium, and is used for overcoming the defects in the prior art.
Description
Technical Field
The utility model relates to the technical field of flow measurement equipment, in particular to a venturi flowmeter.
Background
The flow meter is used for measuring the flow of single-phase fluid in a closed pipeline, is commonly used for measuring the flow of fluid media such as air, natural gas, coal gas, water and the like, belongs to one of differential pressure type flow meters, and adopts a flow measuring method based on the Bernoulli's law of conservation of energy and a flow continuity equation, namely a throttling piece in the pipeline reduces the section of the pipeline, so that the flow speed of the media is accelerated at the place where the section of the pipeline is reduced in order to maintain continuous flow, the pressure is reduced, and the square root of the pressure difference before and after the throttling piece is proportional to the flow, namely the flow is known through measuring the pressure difference. The venturi flowmeter mainly comprises a constriction section, a throat section and a diffusion section, wherein the venturi tube is provided with a uniform throat flow field structure, and the size of the section of the throat tube is far smaller than that of the section of the inlet end, so that the static pressure value in the whole length range of the throat tube is far lower than that of the inlet, the resistance of fluid medium passing through the whole venturi tube is far lower than that of the local resistance passing through an inlet cone and the throat tube, and the condition of differential pressure flow measurement is formed. For the venturi tube used as the differential pressure type flowmeter, the high-pressure measuring tube and the low-pressure measuring tube are respectively arranged at the inlet tube wall of the venturi tube and the 1/2 length tube wall of the venturi tube.
Because the outside temperature is difficult to control, especially in the north of yellow river in China, the environment temperature at night is easy to be lower than zero ℃, and in the northeast, the environment temperature is more common, and the temperature is possibly lower. The venturi tube is used as a common measuring tool for measuring the water flow speed, belongs to a form of a differential pressure flowmeter, is used as a common measuring element for measuring differential pressure values, and is easy to exchange heat with the environment by a medium in a pipeline installed by the differential pressure transmitter, so that the medium is solidified, the differential pressure transmitter cannot accurately feed back the pressure difference of a flow medium, thus the flow parameter cannot be accurately fed back according to the pressure difference, and even the high-pressure measuring tube or the low-pressure measuring tube is blocked due to solidification of the medium, so that the flow measurement is meaningless. In addition, in order to ensure the medium delivery, avoid the external temperature to influence the medium delivery, a temperature measuring device for measuring the temperature of the flowing medium is needed, the existing temperature measuring sensor is arranged on the side wall of the pipeline, and the temperature of the fluid medium measured by the temperature measuring sensor is inaccurate. Therefore, corresponding adaptability improvement is needed for the temperature compensation requirement due to the external temperature change and the temperature measurement mode of the fluid medium so as to meet the market requirement.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides the Venturi flowmeter which is convenient for calculating the flow of the flowing medium, is convenient for carrying out temperature compensation on the medium in the pressure measuring tube, has high precision for measuring the flow of the medium and accurate temperature measurement of the fluid medium, and is used for overcoming the defects in the prior art.
The utility model adopts the technical scheme that: the utility model provides a venturi flowmeter, includes entrance, shrink section, throat and the diffusion section of arranging in proper order, entrance on the intercommunication have first pressure detecting pipe, the middle part intercommunication of throat has the second to examine and presses the pipe, the first pressure detecting pipe and the second examine and press the intercommunication between the pipe and have differential pressure transmitter, first pressure detecting pipe and second examine and press the pipe on parcel respectively have the heating jacket, the diffusion section on install temperature measuring mechanism, temperature measuring mechanism includes the temperature measuring pipe of diffusion section outside intercommunication, installs the support in the temperature measuring pipe and the temperature sensor that the middle part of temperature measuring pipe set up, temperature sensor installs on the support, temperature sensor's detection end is towards the diffusion section.
Preferably, the inlet section is provided with a flow stabilizing mechanism, the flow stabilizing mechanism comprises a flow stabilizing pipe communicated with the outer side of the inlet section and a flow stabilizing plate arranged in the flow stabilizing pipe, a plurality of flow stabilizing holes are uniformly formed in the flow stabilizing plate, the two ends of the inlet section and the flow stabilizing pipe are respectively provided with a first flange, and the inlet section and the flow stabilizing pipe are communicated through the first flange.
Preferably, the flow stabilizing plate is embedded with a resistance heating layer, one side of the flow stabilizing plate is provided with a control pipe, the side wall of the flow stabilizing pipe is provided with an operation hole, and the operation hole is sleeved on the operation pipe.
Preferably, the first pressure detecting tube and the second pressure detecting tube adopt circular ring tubular structures respectively, the inner side of the first pressure detecting tube is provided with a plurality of first pressure detecting tubes along the circumferential direction of the first pressure detecting tube, the first pressure detecting tube is communicated with the inlet section through a plurality of first pressure detecting tubes, the inner side of the second pressure detecting tube is provided with a plurality of second pressure detecting tubes along the circumferential direction of the second pressure detecting tube, the second pressure detecting tubes are communicated with the throat through a plurality of second pressure detecting tubes, the outer sides of the first pressure detecting tube and the second pressure detecting tube are respectively provided with a pressure measuring tube, and the first pressure detecting tube or the second pressure detecting tube is connected with the differential pressure transmitter through the pressure measuring tubes.
Preferably, the outer side of the heating sleeve is wrapped with a heat preservation sleeve, and the heating sleeve is wrapped on the outer wall of the first pressure detection tube or the second pressure detection tube.
Preferably, a conduit is installed on one side of the bracket, a wire guide hole is arranged on the side wall of the temperature measuring tube, the wire guide hole is sleeved on the conduit, and one side of the conduit is contacted with the temperature sensing sensor.
Preferably, the outer side of the diffusion section and two ends of the temperature measuring tube are respectively provided with a second flange, and the diffusion section is communicated with the temperature measuring tube through the second flange.
The utility model has the beneficial effects that: firstly, the pressure difference of the first pressure detecting tube and the second pressure detecting tube is measured through the pressure difference transmitter, the flow of the flowing medium is calculated according to the cross-sectional areas of the inlet section and the throat, and the heating jacket is arranged to facilitate the heating treatment of the first pressure detecting tube or the second pressure detecting tube so as to prevent the medium in the first pressure detecting tube or the second pressure detecting tube from heat release and solidification, thereby avoiding the medium from blocking the first pressure detecting tube or the second pressure detecting tube, ensuring the accuracy of measuring the flow of the medium, and the temperature sensor is arranged in the middle of the temperature detecting tube so as to accurately measure the temperature of the fluid medium.
And the resistance heating layer and the arranged flow stabilizing pipe are embedded in the flow stabilizing plate, so that the resistance heating layer can be controlled to heat according to a temperature signal fed back by the temperature sensor, the flow stabilizing plate is heated, and the flowing medium is heated by the flow stabilizing plate to avoid exothermic solidification of the flowing medium.
And the first pressure detecting pipes and the second pressure detecting pipes are respectively in a circular ring-shaped tubular structure, a plurality of first pressure taking pipes are arranged on the inner sides of the first pressure detecting pipes along the circumferential direction of the first pressure detecting pipes, a plurality of second pressure taking pipes are arranged on the inner sides of the second pressure detecting pipes along the circumferential direction of the second pressure detecting pipes, and pressure measuring pipes are respectively arranged on the outer sides of the first pressure detecting pipes and the second pressure detecting pipes, so that medium can smoothly flow into the pressure measuring pipes, the first pressure detecting pipes and the second pressure detecting pipes, the stability of flow detection is ensured, and the first pressure detecting pipes or the second pressure detecting pipes can be conveniently subjected to heat preservation treatment through the heat preservation sleeve, so that the use influence of external temperature on the pressure detecting pipes is reduced.
In addition, the utility model discloses a conduit that sets up, the wire of conveniently being suit temperature sensor to the going on of temperature sensing operation, and through the second ring flange that sets up, the convenience is loaded and unloaded the operation to the temperature measurement pipe.
Drawings
Fig. 1 is a schematic perspective view of the present utility model.
Fig. 2 is a schematic structural view of the present utility model.
Fig. 3 is an enlarged schematic view at a in fig. 2.
Fig. 4 is a schematic cross-sectional view of the present utility model.
FIG. 5 is a schematic diagram of the assembly of a heating jacket and a thermal insulation jacket according to the present utility model.
FIG. 6 is a schematic diagram illustrating the assembly of the bracket and the temperature sensor according to the present utility model.
FIG. 7 is a schematic perspective view of a stabilizer plate according to the present utility model.
Detailed Description
As shown in fig. 1 to 7, a venturi flowmeter, including entrance section 1, shrink section 2, throat 3 and diffusion section 4 that arrange in proper order, entrance section 1 on the intercommunication have first pressure detecting pipe 5, the middle part intercommunication of throat 3 has second pressure detecting pipe 6, thereby the intercommunication has pressure difference transmitter 7 between first pressure detecting pipe 5 and the second pressure detecting pipe 6, pressure difference to first pressure detecting pipe 5 and second pressure detecting pipe 6 through pressure difference transmitter 7 is measured, and change pressure difference signal into the signal of telecommunication and feed back, thereby calculate the flow of flowing medium, first pressure detecting pipe 5 and second pressure detecting pipe 6 on the parcel have heating jacket 8 respectively, thereby be convenient for carry out heating treatment to first pressure detecting pipe 5 or second pressure detecting pipe 6, in order to prevent first pressure detecting pipe 5 or second pressure detecting pipe 6 medium heat release solidification, thereby avoid the medium to block up first pressure detecting pipe 5 or second pressure detecting pipe 6, ensure the precision of measuring medium flow, diffusion section 4 on install temperature measuring mechanism including diffusion section 4, temperature detecting pipe 9 and diffusion section 11 are installed to the temperature sensing pipe 11, temperature sensing pipe 11 is installed to the accurate, and temperature sensing pipe 11 is installed to the temperature measuring mechanism is installed in the middle part, and is installed to the temperature sensing pipe 11.
The inlet section 1 is provided with a steady flow mechanism, the steady flow mechanism comprises a steady flow pipe 12 communicated with the outer side of the inlet section 1 and a steady flow plate 13 arranged in the steady flow pipe 12, a plurality of steady flow holes 14 are uniformly formed in the steady flow plate 13, so that steady flow treatment is carried out on flowing media, fluctuation of pressure sampling point signals caused by noise formed by random and disordered vortex is avoided, accuracy of media measurement is further improved, two ends of the inlet section 1 and the steady flow pipe 12 are respectively provided with a first flange 15, and the inlet section 1 and the steady flow pipe 12 are communicated through the first flange 15, so that loading and unloading operation of the steady flow pipe 12 is facilitated.
The resistance heating layer is embedded in the current stabilizing plate 13, the control tube 16 is arranged on one side of the current stabilizing plate 13, the side wall of the current stabilizing tube 12 is provided with an operation hole, the operation hole is sleeved on the operation tube 12, the control tube 16 is used for sleeving a power supply wire of the resistance heating layer, and the current stabilizing plate 13 is conveniently heated and operated through the resistance heating layer according to a temperature signal fed back by the temperature sensor 11, so that flowing media are heated by the current stabilizing plate 13, and heat release and solidification of the flowing media are avoided.
The first pressure detecting pipe 5 and the second pressure detecting pipe 6 adopt circular ring tubular structures respectively, a plurality of first pressure taking pipes 17 are arranged on the inner side of the first pressure detecting pipe 5 along the circumferential direction of the first pressure detecting pipe, the first pressure detecting pipe 5 is communicated with the inlet section 1 through a plurality of first pressure taking pipes 17, a plurality of second pressure taking pipes 18 are arranged on the inner side of the second pressure detecting pipe 6 along the circumferential direction of the second pressure detecting pipe, the second pressure detecting pipe 6 is communicated with the throat 3 through a plurality of second pressure taking pipes 18, pressure measuring pipes 19 are arranged on the outer sides of the first pressure detecting pipe 5 and the second pressure detecting pipe 6 respectively, the first pressure detecting pipe 5 or the second pressure detecting pipe 6 is connected with the pressure difference transmitter 7 through the pressure measuring pipes 19, and the medium can flow into the pipes 19, the first pressure detecting pipes 5 and the second pressure detecting pipes 6 smoothly, and therefore flow stability is guaranteed. Further, a control valve is installed on the pressure measuring pipe 19.
The outside parcel of heating cover 8 have insulation cover 20, the heating cover 8 parcel is on the outer wall of first pressure detecting pipe 5 or second pressure detecting pipe 6 to be convenient for carry out heating and heat preservation to first pressure detecting pipe 5 or second pressure detecting pipe 6, in order to prevent that the medium from exothermic solidification in first pressure detecting pipe 5 or the second pressure detecting pipe 6 from causing the pipeline to block up.
A conduit 21 is installed on one side of the bracket 10, a wire hole is started on the side wall of the temperature measuring tube 9, the wire hole is sleeved on the conduit 21, one side of the conduit 21 is contacted with the temperature sensor 11, and the conduit 21 is used for sleeving a wire of the temperature sensor 11.
The second flange plates 22 are respectively arranged at the outer side of the diffusion section 4 and the two ends of the temperature measuring tube 9, and the diffusion section 4 is communicated with the temperature measuring tube 9 through the second flange plates, so that the temperature measuring tube 9 is convenient to assemble and disassemble.
As shown in fig. 1 to 7, before the product is put into use, the installation on site should be completed, and the specific flow is as follows:
firstly, one end of a steady flow pipe 12 provided with a steady flow plate 13 is arranged at a preset measuring position through a first flange 15, and an inlet section 1 is arranged at the other end of the steady flow pipe 12; one end of the temperature measuring tube 9 provided with the temperature sensing sensor 11 is arranged at a preset measuring position through a second flange plate 22, and the diffusion section 4 is arranged at the other end of the temperature measuring tube 9; install differential pressure transmitter 7 both sides on the pressure measurement pipe 19 that is linked together with first pressure detection pipe 5 and second pressure detection pipe 6 to the power supply end of the resistance heating layer that inlays in differential pressure transmitter 7, heating jacket 8, temperature sensor 11 and current stabilizer 13 is connected with control terminal respectively, thereby accomplishes the initial installation of this product.
Then, checking and running the product, wherein the specific process is as follows, the heating sleeve 8 is started to heat the first pressure detecting tube 5 and the second pressure detecting tube 6, the temperatures of the first pressure detecting tube 5 and the second pressure detecting tube 6 are measured, and whether the first pressure detecting tube 5 and the second pressure detecting tube 6 are heated or not is checked; controlling the flowing medium to be conveyed, checking whether feedback information of the differential pressure transmitter 7 and the temperature sensor 11 is consistent with the condition of the conveyed medium, controlling a resistance heating layer embedded in the current stabilizer 13 to heat, observing whether feedback information of the temperature sensor 11 changes, and judging whether the product meets the requirements of flow and temperature measurement.
And after all the operations are finished, judging the product to be a qualified product meeting the use. In the specific use process, because the external temperature is difficult to control, according to the feedback information of the temperature sensor 11, the control terminal is utilized to carry out temperature compensation on flowing media by the resistance heating layers embedded in the heating sleeve 8 and the current stabilizer 13 so as to ensure the stability of flow measurement; in normal operation of the product, a high-pressure source comes from a first pressure detecting tube 5 communicated with an inlet section 1 and a pressure measuring tube 19 communicated with the first pressure detecting tube 5, and a low-pressure source comes from a second pressure reducing tube 6 communicated with the second pressure detecting tube 6 on a throat 3, and in the process that the inlet section 1 of the pressure measuring tube 19 communicated with the second pressure detecting tube 6 conveys media to an upstream contraction section 2, a plurality of first pressure taking tubes 17 are arranged between the first pressure detecting tube 5 and the inlet section 1, so that the pressure difference between the first pressure detecting tube 5 and the inlet section 1 is reduced; in the process of conveying the medium from the throat 3 to the diffusion section 4, a plurality of second pressure taking pipes 18 are arranged between the second pressure reducing pipe 6 and the throat 3, so that the pressure difference between the second pressure reducing pipe 6 and the throat 3 is measured more accurately through the pressure difference transmitter 7.
The utility model can calculate the flow of flowing medium conveniently, compensate the temperature of the medium in the pressure measuring tube conveniently, has high accuracy of measuring the flow of the medium, and measures the temperature of the fluid medium accurately, thus the utility model has wide market prospect.
The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, so that all equivalent changes or modifications of the structure, characteristics and principles described in the claims should be included in the scope of the present utility model.
Claims (7)
1. The utility model provides a venturi flowmeter, includes entrance section (1), constriction section (2), throat (3) and diffusion section (4) that arrange in proper order, its characterized in that: the utility model provides a pressure sensor, including entrance section (1) on the intercommunication have first pressure detecting pipe (5), the middle part intercommunication of throat (3) has second pressure detecting pipe (6), the intercommunication has pressure difference changer (7) between first pressure detecting pipe (5) and second pressure detecting pipe (6), first pressure detecting pipe (5) and second pressure detecting pipe (6) on wrap up respectively and have heating jacket (8), diffusion section (4) on install temperature measuring mechanism, temperature measuring mechanism includes temperature measuring pipe (9) of diffusion section (4) outside intercommunication, installs support (10) in temperature measuring pipe (9) to and temperature sensing sensor (11) that the middle part of temperature measuring pipe (9) set up, temperature sensing sensor (11) are installed on support (10), the detection end of temperature sensing sensor (11) is towards diffusion section (4).
2. The venturi flow meter of claim 1, wherein: the inlet section (1) on install stationary flow mechanism, stationary flow mechanism includes stationary flow pipe (12) and stationary flow board (13) of installation in stationary flow pipe (12) of inlet section (1) outside intercommunication, evenly offered a plurality of stationary flow hole (14) on stationary flow board (13), inlet section (1) and stationary flow pipe (12) both ends install first ring flange (15) respectively, inlet section (1) and stationary flow pipe (12) are linked together through first ring flange (15).
3. The venturi flow meter of claim 2, wherein: the electric resistance heating layer is embedded in the current stabilizing plate (13), the control tube (16) is arranged on one side of the current stabilizing plate (13), an operation hole is formed in the side wall of the current stabilizing tube (12), and the operation hole is sleeved on the control tube (16).
4. The venturi flow meter of claim 1, wherein: the first pressure detecting pipe (5) and the second pressure detecting pipe (6) adopt circular ring tubular structures respectively, a plurality of first pressure detecting pipes (17) are arranged on the inner side of the first pressure detecting pipe (5) along the circumferential direction of the first pressure detecting pipe, the first pressure detecting pipe (5) is communicated with the inlet section (1) through a plurality of first pressure detecting pipes (17), a plurality of second pressure detecting pipes (18) are arranged on the inner side of the second pressure detecting pipe (6) along the circumferential direction of the second pressure detecting pipe, the second pressure detecting pipe (6) is communicated with the throat (3) through a plurality of second pressure detecting pipes (18), pressure measuring pipes (19) are arranged on the outer sides of the first pressure detecting pipes (5) and the second pressure detecting pipes (6) respectively, and the first pressure detecting pipes (5) or the second pressure detecting pipes (6) are connected with the pressure difference transmitter (7) through the pressure measuring pipes (19).
5. The venturi flow meter of claim 1, wherein: the outside of the heating sleeve (8) is wrapped with a heat preservation sleeve (20), and the heating sleeve (8) is wrapped on the outer wall of the first pressure detection tube (5) or the second pressure detection tube (6).
6. The venturi flow meter of claim 1, wherein: a conduit (21) is arranged on one side of the support (10), a wire guide hole is formed in the side wall of the temperature measuring tube (9), the wire guide hole is sleeved on the conduit (21), and one side of the conduit (21) is in contact with the temperature sensing sensor (11).
7. The venturi flow meter of claim 1, wherein: the outside of diffusion section (4) and the both ends of temperature measurement pipe (9) install second ring flange (22) respectively, diffusion section (4) are linked together with temperature measurement pipe (9) through the second ring flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322207842.1U CN220542149U (en) | 2023-08-17 | 2023-08-17 | Venturi flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322207842.1U CN220542149U (en) | 2023-08-17 | 2023-08-17 | Venturi flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220542149U true CN220542149U (en) | 2024-02-27 |
Family
ID=89976367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322207842.1U Active CN220542149U (en) | 2023-08-17 | 2023-08-17 | Venturi flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220542149U (en) |
-
2023
- 2023-08-17 CN CN202322207842.1U patent/CN220542149U/en active Active
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