CN217717680U - Device and system for evaluating performance of heat supply network water corrosion and scale inhibitor - Google Patents
Device and system for evaluating performance of heat supply network water corrosion and scale inhibitor Download PDFInfo
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- CN217717680U CN217717680U CN202221508520.XU CN202221508520U CN217717680U CN 217717680 U CN217717680 U CN 217717680U CN 202221508520 U CN202221508520 U CN 202221508520U CN 217717680 U CN217717680 U CN 217717680U
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Abstract
The embodiment of the utility model provides a heat supply network water inhibition antisludging agent performance evaluation device and system belongs to inhibition antisludging agent performance evaluation field. The device for evaluating the performance of the heat supply network water corrosion and scale inhibitor comprises: the water bath heating box is provided with a medicament feeding port and a water replenishing port; the heat supply network water monitoring mechanism comprises a medicament concentration tester, and a detection probe of the medicament concentration tester is arranged in the water bath heating box; the circulating pump is connected with the water bath heating box through a circulating pipeline; the film hanging device is arranged in the film hanging device pipeline, the film hanging device pipeline is connected with the circulating pipeline in parallel, and a film is hung on the film hanging device. The utility model discloses a design water bath heating cabinet, circulating pump, circulating line simulation form a little heating network management, add the inhibition antisludging agent to the hot circulating water in the heating network management, carry out performance evaluation.
Description
Technical Field
The utility model relates to a corrosion and scale inhibitor performance evaluation field specifically relates to a heat supply network water corrosion and scale inhibitor performance device and a heat supply network water corrosion and scale inhibitor performance evaluation system.
Background
Along with the expansion of the development scale of the urbanization of the society, the scale of the urban central heating is continuously expanded, the temperature of circulating water in a heating system is increased, and a carbon steel pipeline in a public network system faces a more severe corrosion environment.
The corruption of city heating pipe network mainly corrodes with oxygen corrosion and deposit under the corruption and arouses, for the corruption of solving above-mentioned heating pipe network and the appearance of scale deposit condition, the measure of mainly taking at present is: adding corrosion and scale inhibitor and adding deoxygenation facilities in the pipe network. The corrosion and scaling rate of the pipe network is determined by the performance of the added corrosion and scaling inhibitor. And the water inlet temperature and the water return temperature of the urban heating network pipe are both high, so that the performance of the selected corrosion and scale inhibitor cannot be evaluated and the agent cannot be screened in the running system due to the large pipe network system. Therefore, the utility model provides a heat supply network water corrosion and scale inhibitor performance evaluation device and a heat supply network water corrosion and scale inhibitor performance evaluation system to solve the technical problem.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a heat supply network water inhibition antisludging agent performance evaluation device and a heat supply network water inhibition antisludging agent performance evaluation system, the utility model discloses a heat supply network water inhibition antisludging agent performance evaluation device adds the inhibition antisludging agent through simulation heating network management to the hot circulating water in the heating network management, carries out the performance evaluation.
In order to achieve the above object, an embodiment of the present invention provides a device for evaluating performance of a water corrosion and scale inhibitor for a heat supply network, including:
the water bath heating box is provided with a medicament feeding port and a water replenishing port;
the heat supply network water monitoring mechanism comprises a medicament concentration tester, and a detection probe of the medicament concentration tester is arranged in the water bath heating box;
the circulating pipeline is arranged outside the water bath heating box, one end of the circulating pipeline is connected with the water outlet of the water bath heating box, and the other end of the circulating pipeline is connected with the water inlet of the water bath heating box;
the circulating pump is connected with the water bath heating tank through a circulating pipeline;
the film hanging device is arranged in the film hanging device pipeline, the film hanging device pipeline is connected with the circulating pipeline in parallel, and the film hanging device is hung with the film hanging device.
Preferably, the device for evaluating the performance of the heat supply network water corrosion and scale inhibitor further comprises:
and the water inlet end of the radiator is connected with the water outlet end of the circulating pump, and the water outlet end of the radiator is connected into the circulating pipeline.
Preferably, a first temperature sensor and a flowmeter are further arranged in a pipeline section of the circulating pipeline between the circulating pump and the radiator.
Preferably, the device for evaluating the performance of the heat supply network water corrosion and scale inhibitor further comprises:
a corrosion rate determinator, the detection probe of which is placed in the pipe section of the circulation pipe after the water outlet end of the heat sink.
Preferably, the device for evaluating the performance of the heat supply network water corrosion and scale inhibitor further comprises:
and a detection probe of the fouling thermal resistance tester is arranged in a pipeline section of the circulating pipeline behind the water outlet end of the radiator.
Preferably, the water bath heating cabinet is further provided with a temperature control mechanism, the temperature control mechanism comprises an electric heater and a second temperature sensor, the electric heater is arranged at the bottom of the water bath heating cabinet, and a detection probe of the second temperature sensor is arranged in the water bath heating cabinet.
Preferably, the heat supply network water monitoring mechanism further comprises a liquid level sensor, and the liquid level sensor is installed on the inner side wall of the water bath heating box.
Preferably, the heat supply network water monitoring mechanism further comprises a conductivity meter, and a detection probe of the conductivity meter is arranged in the water bath heating box.
Preferably, the heat supply network water monitoring mechanism further comprises a pH meter, and a detection probe of the pH meter is arranged in the water bath heating box.
In a second aspect, the utility model provides a heat supply network water corrosion and scale inhibitor performance evaluation system, including the controller and as above heat supply network water corrosion and scale inhibitor performance evaluation device, the controller with heat supply network water corrosion and scale inhibitor performance evaluation device connects, is used for control heat supply network water corrosion and scale inhibitor performance evaluation device work, the controller still is equipped with control panel.
The utility model discloses a design water bath heating case, circulating pump, circulating line simulation form a little heating network management, add the inhibition antisludging agent to the hot circulating water in the heating network management, carry out the performance evaluation.
Other features and advantages of embodiments of the present invention will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention, but do not constitute a limitation of the embodiments of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a device for evaluating the performance of a corrosion and scale inhibitor for heat supply network water, provided in embodiment 1 of the present invention.
Description of the reference numerals
01-a water bath heating box, 02-a medicament feeding port, 03-a water replenishing port, 04-a medicament concentration tester, 05-a circulating pump, 06-a film hanger, 07-a radiator, 08-a first temperature sensor, 09-a flowmeter, 10-a corrosion rate tester, 11-a dirt thermal resistance tester, 12-an electric heater, 13-a second temperature sensor, 14-a liquid level sensor, 15-a conductivity tester, 16-a PH tester, 17-a third temperature sensor and 18-a circulating pipeline.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the description herein is provided for purposes of illustration and explanation, and is not intended to limit the embodiments of the invention.
In the embodiments of the present invention, unless otherwise stated, the use of directional terms such as "upper, lower, left, and right" generally refers to the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are usually placed when in use. The terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
The terms "parallel", "perpendicular", etc. do not require that the components be absolutely parallel or perpendicular, but may be slightly inclined. For example, "parallel" merely means that the directions are more parallel relative to "perpendicular," and does not mean that the structures must be perfectly parallel, but may be slightly tilted.
The terms "horizontal", "vertical", "overhanging", and the like do not imply a requirement that the components be absolutely horizontal, vertical or overhanging, but may be somewhat inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
Furthermore, the terms "substantially", and the like are intended to indicate that the relative terms are not necessarily strictly required, but may have some deviation. For example: "substantially equal" does not mean absolute equality, but it is difficult to achieve absolute equality in actual production and operation, and certain deviations generally exist. Thus, in addition to absolute equality, "substantially equal" also includes the above-described case where there is some deviation. In this case, unless otherwise specified, terms such as "substantially", and the like are used in a similar manner to those described above.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1, in one aspect, the present embodiment provides a device for evaluating performance of a corrosion and scale inhibitor for a heat supply network, including:
the water bath heating box 01 is provided with a medicament feeding port 02 and a water replenishing port 03;
the heat supply network water monitoring mechanism comprises a medicament concentration tester 04, and a detection probe of the medicament concentration tester 04 is arranged in the water bath heating box 01; the reagent concentration measuring instrument 04 is used for detecting the concentration of the corrosion and scale inhibitor in the water bath heating box 01;
the circulating pipeline 18 is arranged outside the water bath heating box, one end of the circulating pipeline 18 is connected with a water outlet of the water bath heating box 01, and the other end of the circulating pipeline 18 is connected with a water inlet of the water bath heating box 01;
the circulating pump 05, the said circulating pump 05 is connected with said water bath heater tank 01 through the circulating line 18;
the hanging piece device 06 is arranged in a hanging piece device pipeline, the hanging piece device pipeline is connected with the circulating pipeline 18 in parallel, and hanging pieces are hung on the hanging piece device 06.
Specifically, the water bath heating tank 01, the circulating pump 05 and the circulating pipeline 18 are simulated to form a small heating network pipe. Wherein, the water bath heating tank 01 is used for heating the circulating water in the circulating pipeline 18, and the circulating pump 05 ensures the circulating water circulation flow of the circulating pipeline 18.
The hanging piece device 06 is used for hanging pieces, and the hanging pieces are used for corrosion testing of circulating water.
The outlet end of the water-bath heating box 01 and the inlet end of the circulating water pump are sequentially connected with a one-way valve and a stop valve, and the outlet end of the circulating water pump is also provided with the stop valve.
The water bath heating box 01 is made of PE materials, and heat resistance is enhanced. Water bath heating case 01 is equipped with sealed lid, and sealed lid is equipped with medicament input port 02 and moisturizing mouth 03 on locating water bath heating case 01's opening, sealed covering, and when the circulating water in water bath heating case 01 was less than the default, moisturizing through moisturizing mouth 03. When the concentration of the corrosion and scale inhibitor in the water bath heating box 01 is lower than a preset value, the corrosion and scale inhibitor is put in through the agent putting port 02, so that the concentration of the corrosion and scale inhibitor is increased; when the concentration of the corrosion and scale inhibitor in the water bath heating box 01 is higher than a preset value, the water is supplemented through the water supplementing port 03, and the concentration of the corrosion and scale inhibitor is reduced.
The inlet end and the outlet end of the hanger pipeline are respectively connected into the circulating pipeline 18, an inlet stop valve and an outlet stop valve are installed on the hanger pipeline, the inlet stop valve is installed at the inlet end of the hanger 06, the outlet stop valve is installed at the outlet end of the segment device, and in the embodiment, the hanger 06 is a transparent glass fiber reinforced plastic hanger 06.
In this embodiment, the device for evaluating the performance of the heat supply network water corrosion and scale inhibitor further comprises a radiator 07, the radiator 07 is connected to the circulation pipeline, a water inlet end of the radiator 07 is connected to a water outlet end of the circulation pump 05, and a water outlet end of the radiator 07 is connected to the circulation pipeline 18. The radiator 07 is used to regulate the temperature of the circulating water in the circulating pipe 18. The radiator 07 adopts a steel-aluminum mixed radiator 07, and an exhaust valve is also arranged on an outlet pipeline of the radiator 07 to ensure the air pressure balance in the circulating pipeline 18.
In this embodiment, the circulation pipe 18 between the circulation pump 05 and the radiator 07 is further provided with a first temperature sensor 08 and a flow meter 09.
Specifically, the first temperature sensor 08 is used for measuring the temperature of the circulating water at the inlet end of the radiator 07, and the first flow meter 09 is used for measuring the flow rate of the circulating water in the circulating pipeline 18.
In this embodiment, a third temperature sensor 17 is further disposed between the outlet of the radiator 07 and the water bath heating tank 01, and the third temperature sensor 17 is used for measuring the temperature of the circulating water at the outlet end of the radiator 07.
In this embodiment, the device for evaluating the performance of the heat supply network water corrosion and scale inhibitor further comprises a corrosion rate tester 10, and a detection probe of the corrosion rate tester 10 is placed in the circulating pipeline 18 after being radiated by the radiator 07. The corrosion rate tester 10 is used for monitoring the corrosion rate of the circulating water after the temperature of the circulating water is adjusted by the radiator 07 in real time.
In this embodiment, the device for evaluating the performance of the heat supply network water corrosion and scale inhibitor further comprises a fouling thermal resistance tester 11, and a detection probe of the fouling thermal resistance tester 11 is placed in the circulating pipeline 18 after heat dissipation by the radiator 07. The fouling thermal resistance tester 11 is used for monitoring the fouling deposition rate of the circulating water after the temperature of the circulating water is adjusted by the radiator 07 in real time.
When the corrosion rate exceeds a specified range, adding a corrosion and scale inhibitor through the agent adding port 02 to increase the adding amount of the corrosion and scale inhibitor; when the deposition rate of the dirt exceeds the specified range, the corrosion and scale inhibitor is added through the agent adding port 02, so that the adding amount of the corrosion and scale inhibitor is increased.
In this embodiment, the water bath heating cabinet 01 is further provided with a temperature control mechanism, the temperature control mechanism comprises an electric heater 12 and a second temperature sensor 13, the electric heater 12 is arranged at the bottom of the water bath heating cabinet 01. The temperature control mechanism is used for heating circulating water in the water bath heating box 01. The second temperature sensor 13 is used in this embodiment to measure the temperature of the circulating water in the water bath heating tank 01. The electric heater 12 employs an electric heating rod. In other embodiments of the present invention, the electric heater 12 is a heating wire.
In this embodiment, the heat supply network water monitoring mechanism further comprises a liquid level sensor 14, and the liquid level sensor 14 is installed on the inner side wall of the water bath heating box 01. Specifically, the liquid level sensor 14 is used for detecting the liquid level of the circulating water stored in the water bath heating tank 01. When the liquid level height does not meet the preset value, water needs to be added into the water bath heating box 01.
In this embodiment, the heat supply network water monitoring mechanism further comprises a conductivity meter 15, and a detection probe of the conductivity meter 15 is disposed in the water bath heating tank 01. The conductivity meter 15 is used to measure the conductivity of the circulating water, thereby determining the solid concentration in the circulating water.
In this embodiment, the heat supply network water monitoring mechanism further includes a PH meter 16, and a detection probe of the PH meter 16 is disposed in the water bath heating tank 01. The PH meter 16 is used for measuring the PH value of the circulating water.
The method for evaluating the performance of the heat supply network water corrosion and scale inhibitor comprises the following steps:
the method comprises the following steps: firstly, adding water into a water bath heating box 01 to a preset liquid level, adding a corrosion and scale inhibitor according to requirements, closing an inlet stop valve and an outlet stop valve at two ends of a hanging piece device 06, detaching the hanging piece device 06, and reinstalling the hanging piece device 06 after hanging pieces.
Step two: sequentially opening a one-way valve and a stop valve at the inlet end of the circulating pump 05 and a stop valve at the outlet end of the circulating water pump; opening an inlet stop valve and an outlet stop valve of the film hanging device 06; the inlet temperature of the radiator 07 is set to 100 °, the outlet temperature of the radiator 07 is set to 70 °, and the circulation pump 05 starts to operate.
Step three: the circulation pump 05 is operated for 15 to 30 days. And taking down the hanging piece on the hanging piece device 06, carrying out acid washing, alkali washing and absolute ethyl alcohol cleaning on the hanging piece, weighing after natural air drying, calculating the corrosion rate of the hanging piece, and evaluating the performance of the heat supply network water corrosion and scale inhibitor or screening different medicaments by combining a corrosion rate tester 10 and a dirt thermal resistance tester 11 on a return water pipeline.
In a second aspect, an embodiment of the present invention provides a system for evaluating performance of a heat supply network water corrosion and scale inhibitor, including a controller and a device for evaluating performance of a heat supply network water corrosion and scale inhibitor as described above, the controller is connected to the device for evaluating performance of a heat supply network water corrosion and scale inhibitor, and is configured to control the device for evaluating performance of a heat supply network water corrosion and scale inhibitor, and the controller is further configured with a control panel.
Specifically, an electric conductivity measuring instrument 15, a medicament concentration measuring instrument 04, a liquid level sensor 14, a second temperature sensor 13, a first temperature sensor 08, a third temperature sensor 17, a corrosion rate measuring instrument 10 and a dirt thermal resistance measuring instrument 11 in the heat supply network water corrosion and scale inhibitor device are respectively connected with a controller. The conductivity meter 15 is connected with the controller and is used for transmitting the measured conductivity to the controller; the reagent concentration determinator 04 is connected with the controller and is used for transmitting the measured concentration of the corrosion and scale inhibitor to the controller; the liquid level sensor 14 is connected with the controller and is used for transmitting the circulating water liquid level height in the water bath heating box 01 to the controller; the second temperature sensor 13 is connected with the controller and is used for transmitting the measured temperature of the circulating water in the water bath heating box 01 to the controller; the first temperature sensor 08 is connected with the controller and is used for transmitting the temperature of circulating water at the inlet of the radiator 07 to the controller; the third temperature sensor 17 is connected with the controller and is used for transmitting the temperature of the circulating water at the outlet of the radiator 07 to the controller; the corrosion rate tester 10 is connected with the controller and is used for transmitting the corrosion rate of the circulating water to the controller; the fouling thermal resistance tester 11 is connected with the controller and is used for transmitting the fouling deposition rate of the circulating water to the controller; the pH meter 16 is connected with the controller and is used for transmitting the pH value of the circulating water in the heating water bath tank to the controller.
In this embodiment, the controller is provided with a signal receiver, and the conductance meter 15, the chemical concentration meter 04, the liquid level sensor 14, the second temperature sensor 13, the PH meter 16, the first temperature sensor 08, the third temperature sensor 17, the corrosion rate meter 10, and the fouling heat resistance meter 11 are respectively provided with a signal transmitter matched with the signal receiver.
In this embodiment, the controller is further provided with a control panel, and the control panel is provided with a display for displaying the measurement data received by the controller through the signal receiver; an operating button is further arranged on the control panel, and the start and stop of the control is controlled by the operator through the operating button.
In this embodiment, the operator can evaluate the performance of the corrosion and scale inhibitor for the heat supply network water according to the water bath temperature, the liquid level height, the circulation flow, the corrosion rate, the fouling resistance and the water temperature of the circulating water of the water bath heating box 01. Different medicaments can also be added for testing, and the function of medicament screening is achieved.
The above describes in detail optional implementation manners of embodiments of the present invention with reference to the accompanying drawings, however, the embodiments of the present invention are not limited to the details in the above implementation manners, and in the technical concept scope of the embodiments of the present invention, it is possible to perform various simple modifications on the technical solutions of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the foregoing embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the embodiments of the present invention do not separately describe various possible combinations.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, various different implementations of the embodiments of the present invention can be combined arbitrarily, and as long as it does not violate the idea of the embodiments of the present invention, it should also be regarded as the disclosure of the embodiments of the present invention.
Claims (10)
1. A heat supply network water corrosion and scale inhibitor performance evaluation device is characterized by comprising:
the water bath heating box (01) is provided with a medicament feeding port (02) and a water replenishing port (03);
the heat supply network water monitoring mechanism comprises a medicament concentration tester (04), and a detection probe of the medicament concentration tester (04) is arranged in the water bath heating box (01);
the circulating pipeline (18) is arranged outside the water bath heating box, one end of the circulating pipeline (18) is connected with a water outlet of the water bath heating box (01), and the other end of the circulating pipeline (18) is connected with a water inlet of the water bath heating box (01);
the circulating pump (05), the said circulating pump (05) is connected with said water bath heating cabinet (01) through the circulating line (18);
the film hanging device (06) is arranged in a film hanging device pipeline, the film hanging device pipeline is connected with the circulating pipeline (18) in parallel, and the film hanging device (06) is hung with hanging films.
2. The apparatus for evaluating the performance of a heat network water corrosion and scale inhibitor according to claim 1, further comprising:
the water inlet end of the radiator (07) is connected with the water outlet end of the circulating pump (05), and the water outlet end of the radiator (07) is connected with the circulating pipeline (18).
3. The device for evaluating the performance of the heat supply network water corrosion and scale inhibitor according to claim 2, wherein a first temperature sensor (08) and a flow meter (09) are further arranged in the pipeline section of the circulating pipeline (18) between the circulating pump (05) and the radiator (07).
4. The apparatus for evaluating the performance of a heat network water corrosion and scale inhibitor according to claim 2, further comprising:
a corrosion rate measuring instrument (10), wherein a detection probe of the corrosion rate measuring instrument (10) is arranged in a pipeline section of the circulating pipeline (18) behind the water outlet end of the radiator (07).
5. The apparatus for evaluating the performance of a heat network water corrosion and scale inhibitor according to claim 2, further comprising:
and a detection probe of the fouling thermal resistance tester (11) is arranged in a pipeline section of the circulating pipeline (18) behind the water outlet end of the radiator (07).
6. The device for evaluating the performance of the corrosion and scale inhibitor for the heat supply network water is characterized in that the water bath heating box (01) is further provided with a temperature control mechanism, the temperature control mechanism comprises an electric heater (12) and a second temperature sensor (13), the electric heater (12) is arranged at the bottom of the water bath heating box (01), and a detection probe of the second temperature sensor (13) is arranged in the water bath heating box (01).
7. The device for evaluating the performance of the heat supply network water corrosion and scale inhibitor according to claim 1, wherein the heat supply network water monitoring mechanism further comprises a liquid level sensor (14), and the liquid level sensor (14) is mounted on the inner side wall of the water bath heating box (01).
8. The device for evaluating the performance of the corrosion and scale inhibitor for the heat supply network water as claimed in claim 1, wherein the heat supply network water monitoring mechanism further comprises a conductivity meter (15), and a detection probe of the conductivity meter (15) is arranged in the water bath heating box (01).
9. The device for evaluating the performance of the heat supply network water corrosion and scale inhibitor according to claim 1, wherein the heat supply network water monitoring mechanism further comprises a pH meter (16), and a detection probe of the pH meter (16) is arranged in the water bath heating box (01).
10. A heat supply network water corrosion and scale inhibitor performance evaluation system, which is characterized by comprising a controller and a heat supply network water corrosion and scale inhibitor performance evaluation device according to any one of claims 1 to 9, wherein the controller is connected with the heat supply network water corrosion and scale inhibitor performance evaluation device and is used for controlling the heat supply network water corrosion and scale inhibitor performance evaluation device to work, and the controller is further provided with a control panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221508520.XU CN217717680U (en) | 2022-06-15 | 2022-06-15 | Device and system for evaluating performance of heat supply network water corrosion and scale inhibitor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221508520.XU CN217717680U (en) | 2022-06-15 | 2022-06-15 | Device and system for evaluating performance of heat supply network water corrosion and scale inhibitor |
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| CN217717680U true CN217717680U (en) | 2022-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221508520.XU Active CN217717680U (en) | 2022-06-15 | 2022-06-15 | Device and system for evaluating performance of heat supply network water corrosion and scale inhibitor |
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| CN (1) | CN217717680U (en) |
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- 2022-06-15 CN CN202221508520.XU patent/CN217717680U/en active Active
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