Flow verification auxiliary device

Abstract

The utility model relates to the technical field of flow verification, in particular to a flow verification auxiliary device which comprises a flow measuring unit and an energy supply unit, and the flow measuring unit comprises a valve body and a control piece. The valve body is at least provided with a liquid inlet hole and a first liquid outlet hole, the valve body has a first state and a second state, when the valve body is in the first state, the liquid inlet hole is communicated with the first liquid outlet hole, and when the valve body is in the second state, the liquid inlet hole is separated from the first liquid outlet hole; the control piece is configured to enable the valve body to be in a second state by default when being electrified and switch the state of the valve body when receiving a control signal; the energy supply unit comprises a power supply connecting piece and a voltage regulating piece, the power supply connecting piece is electrically connected with an external power supply, the input end of the voltage regulating piece is electrically connected with the power supply connecting piece, the output end of the voltage regulating piece is electrically connected with the current measuring unit, and the voltage regulating piece is used for converting output voltage of the external power supply to supply power to the current measuring unit. According to the flow verification auxiliary device, the flow measurement unit and the energy supply unit are arranged, an integrated power supply is omitted, and the portability of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flow calibration, in particular to a flow calibration auxiliary device. Background Art

[0002] During the production and use of instruments, due to various factors, the output flow rate is likely to change. In order to ensure the accuracy and reliability of the instrument output flow rate, it is necessary to calibrate the flow rate of the instrument. During the flow calibration process, flow measurement is a crucial step. Only after accurately measuring the actual flow rate of the instrument can subsequent operations, such as data processing and analysis, be carried out based on the test results.

[0003] There are various common flow measurement methods, such as the volumetric method, the differential pressure method, the electromagnetic method, etc. Taking the volumetric method as an example, the flow rate is determined by measuring the volume of liquid flowing through within a certain period of time. In order to ensure the accuracy of the test results of the volumetric method, an electric flow calibration auxiliary device is often used for flow measurement.

[0004] Existing flow calibration auxiliary devices usually integrate a power supply as a whole to meet the power consumption requirements. However, the integrated power supply will occupy a certain internal space of the device, resulting in a large and heavy device with poor portability. Summary of the Utility Model

[0005] Therefore, the technical problem to be solved by the present utility model is to overcome the poor portability of the existing device, and provide a flow calibration auxiliary device. By setting a flow measurement unit and an energy supply unit, the integrated power supply is cancelled, and the portability of the device is improved.

[0006] The present utility model provides a flow calibration auxiliary device, including a flow measurement unit. The flow measurement unit includes a valve body and a control member. At least a liquid inlet hole and a first liquid outlet hole are formed on the valve body. The valve body includes a first state and a second state. When the valve body is in the first state, the liquid inlet hole is communicated with the first liquid outlet hole. When the valve body is in the second state, the liquid inlet hole is separated from the first liquid outlet hole. The control member is configured to make the valve body default to be in the second state when powered on, and can switch the state of the valve body when receiving a control signal. And an energy supply unit. The energy supply unit includes a power supply connection member and a voltage regulating member. The power supply connection member is used for electrically connecting with an external power supply. The input end of the voltage regulating member is electrically connected with the power supply connection member. The output end of the voltage regulating member is electrically connected with the flow measurement unit. The voltage regulating member is used for converting the voltage output by the external power supply to supply power to the flow measurement unit.

[0007] In one embodiment of the present utility model, the power supply connector is set as any one of USB type-A, USB type-B, USB type-C, Mini-USB, and Micro-USB.

[0008] In one embodiment of the present utility model, a second liquid outlet hole is further opened on the valve body. When the valve body is in the second state, the second liquid outlet hole is communicated with the liquid inlet hole.

[0009] In one embodiment of the present utility model, the control member is configured to switch the valve body to the first state when receiving the control signal; and switch the valve body to the second state when receiving the control signal and after a preset time.

[0010] In one embodiment of the present utility model, the energy supply unit further includes a switch, and the switch can be switched between a disconnected state and a connected state; wherein, when the switch is switched from the disconnected state to the connected state, the control signal is generated.

[0011] In one embodiment of the present utility model, the flow measurement unit further includes a display, and the display is electrically connected to the control member, and the display is at least used to display the remaining duration of the preset time.

[0012] In one embodiment of the present utility model, a protective shell is further included. An accommodation cavity is opened in the protective shell, and at least part of the flow measurement unit and the energy supply unit are arranged in the accommodation cavity.

[0013] In one embodiment of the present utility model, the protective shell includes a box body and a cover body. An open cavity is opened on the box body, and the cover body is detachably connected to the box body. The cover body closes the opening of the open cavity to form the accommodation cavity.

[0014] In one embodiment of the present utility model, a first annular clamping portion is provided on the surface of the box body in contact with the cover body, and the first annular clamping portion is arranged around the opening of the open cavity; a second annular clamping portion adapted to the first annular clamping portion is provided on the surface of the cover body in contact with the box body, and the second annular clamping portion is clamped and connected to the first annular clamping portion.

[0015] In one embodiment of the present utility model, a first mounting hole is opened on the box body, and a second mounting hole corresponding to the first mounting hole is opened on the cover body. The box body and the cover body are connected by fasteners installed in the first mounting hole and the second mounting hole.

[0016] The above technical solution of the present utility model has the following beneficial effects compared with the prior art:

[0017] The flow rate calibration auxiliary device described in the present utility model tests the output flow rate of the instrument by setting a flow measurement unit and an energy supply unit. On the one hand, the flow measurement unit driven by electricity is used to achieve the flow rate test, which can ensure the accuracy of the test results. On the other hand, the energy supply unit is electrically connected to an external power supply to supply power to the flow measurement unit, replacing the integrated power supply. It can save the space required for the power supply and improve the space utilization rate of the device on the premise of meeting the power consumption requirements of the flow measurement unit; it is convenient for the miniaturization and lightweight of the device and improves the portability of the device. Description of the Drawings

[0018] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to the specific embodiments of the present utility model in conjunction with the drawings, wherein,

[0019] Figure 1 is a schematic structural diagram of the flow rate calibration auxiliary device from the first perspective in the preferred embodiment of the present utility model;

[0020] Figure 2 is a schematic structural diagram of the flow rate calibration auxiliary device from the second perspective in the preferred embodiment of the present utility model;

[0021] Figure 3 is an exploded structural diagram of the flow rate calibration auxiliary device in the preferred embodiment of the present utility model;

[0022] Figure 4 is a schematic cross-sectional view of the valve body in the preferred embodiment of the present utility model;

[0023] Figure 5 is an electrical schematic diagram of the flow rate calibration auxiliary device in the preferred embodiment of the present utility model;

[0024] Figure 6 is one of the schematic cross-sectional views of the protective shell in the preferred embodiment of the present utility model;

[0025] Figure 7 is the second schematic cross-sectional view of the protective shell in the preferred embodiment of the present utility model.

[0026] Explanation of the reference numerals in the drawings: 10, valve body; 11, solenoid valve; 12, valve connection seat; 121, liquid inlet hole; 122, first liquid outlet hole; 123, second liquid outlet hole; 20, control member; 21, display; 30, power supply connection member; 40, pressure regulating member; 50, switch; 60, protective shell; 61, box body; 611, open cavity; 612, first annular clamping portion; 613, first mounting hole; 62, cover body; 621, second annular clamping portion; 622, second mounting hole. Detailed Embodiments

[0027] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the embodiments given are not intended to limit the present utility model.

[0028] Referring Figure 1 to Figure 2 as shown, the present utility model discloses a flow rate calibration auxiliary device, which includes a flow measurement unit and an energy supply unit.

[0029] The flow measurement unit is used to assist the staff in realizing flow rate testing. Specifically, the flow measurement unit includes a valve body 10 and a control member 20. Preferably, both the valve body 10 and the control member 20 are electrically driven.

[0030] At least a liquid inlet hole 121 and a first liquid outlet hole 122 are formed on the valve body 10, and the liquid inlet hole 121 is used to communicate with the test interface of the instrument to be tested. The valve body 10 includes a first state and a second state. When the valve body 10 is in the first state, the liquid inlet hole 121 is communicated with the first liquid outlet hole 122, so as to drain the liquid from the first liquid outlet hole 122. When the valve body 10 is in the second state, the liquid inlet hole 121 is separated from the first liquid outlet hole 122 to prevent liquid drainage. When performing a test, first adjust the valve body 10 to the second state and connect its liquid inlet hole 121 with the test interface of the instrument to be tested. Then, adjust the valve body 10 to the first state to drain the liquid. When draining the liquid, collect the liquid discharged from the first liquid outlet hole 122 through a container such as a measuring cup. After a certain period of time, adjust the valve body 10 to the second state to prevent liquid drainage, measure the volume of the liquid in the container, and combine the liquid drainage time to obtain the flow rate of the measured instrument.

[0031] The control member 20 is configured to make the valve body 10 default to the second state when powered on, and be able to switch the state of the valve body 10 when receiving a control signal. Those skilled in the art can set different control members 20 according to actual needs to realize the state switching of the valve body 10. By setting the control member 20 to switch the state of the valve body 10, the error of manual testing can be avoided and the test result can be ensured to be accurate.

[0032] The energy supply unit is used to assist the flow measurement unit. Specifically, the energy supply unit includes a power supply connection member 30 and a voltage regulating member 40. The power supply connection member 30 is used to be electrically connected to an external power supply. Those skilled in the art can set the specific power supply connection member 30 and the external power supply according to actual needs; for example, set the power supply connection member 30 as a plug to cooperate with a socket to connect external alternating current; or set the power supply connection member 30 as an interface to connect the direct current of a mobile power supply through a connecting wire.

[0033] The input end of the voltage regulator 40 is electrically connected to the power supply connector 30, and the output end of the voltage regulator 40 is electrically connected to the flow measurement unit, so as to convert the voltage output by the external power supply through the voltage regulator 40 and supply power to the flow measurement unit. Among them, based on the working voltage of the flow measurement unit, when the voltage of the external power supply is higher than the working voltage of the flow measurement unit, it steps down the voltage; when the voltage of the external power supply is lower than the working voltage of the flow measurement unit, it steps up the voltage. Exemplarily, the working voltage of the control member 20 is 24V. When connected to a high-voltage external power supply, such as a 220V AC power supply, voltage reduction is achieved through the voltage regulator 40; when connected to a low-voltage external power supply, such as a 5V power bank, voltage increase is achieved through the voltage regulator 40. When facing alternating current, rectification is achieved through components such as an integrated rectifier to convert the alternating current into direct current. When a flow test is required, the power supply connector 30 is electrically connected to the external power supply. After the voltage regulator 40 adjusts the voltage, the external power supply can supply power to the flow measurement unit. By setting up the energy supply unit to replace the integrated power supply, while meeting the power consumption requirements of the flow measurement unit, the space required for the power supply is saved, and the space utilization rate of the device is improved; it is convenient for the miniaturization and lightweight of the device, and the portability of the device is improved.

[0034] When performing a flow test, first, connect the liquid inlet hole 121 of the valve body 10 to the test interface of the instrument to be tested. Then, electrically connect the power supply connector 30 to the external power supply, and the voltage regulator 40 adjusts the voltage to supply power to the flow measurement unit. After the debugging is completed, the valve body 10 is adjusted from the second state to the first state through the control member 20, so that the liquid inlet hole 121 is connected to the first liquid outlet hole 122 for liquid discharge. When discharging liquid, collect the liquid discharged from the first liquid outlet hole 122 through a measuring cup. After a certain period of time, the valve body 10 is adjusted from the first state to the second state through the control member 20, so that the liquid inlet hole 121 is separated from the first liquid outlet hole 122 to prevent liquid discharge. Finally, obtain the actual flow rate of the instrument by combining the liquid volume in the measuring cup and the liquid discharge time, so as to calibrate the instrument according to the actual flow rate.

[0035] The flow calibration auxiliary device described in the present utility model tests the output flow rate of the instrument by setting up a flow measurement unit and an energy supply unit. On the one hand, the flow measurement is realized through an electric flow measurement unit, which can ensure the accuracy of the test results. On the other hand, the energy supply unit is electrically connected to the external power supply to supply power to the flow measurement unit, replacing the integrated power supply. It can save the space required for the power supply while meeting the power consumption requirements of the flow measurement unit, and improve the space utilization rate of the device; it is convenient for the miniaturization and lightweight of the device, and improves the portability of the device.

[0036] In some embodiments of the flow calibration auxiliary device of the present utility model, the power supply connector 30 is set as any one of USB type-A, USB type-B, USB type-C, Mini-USB, and Micro-USB, so as to be connected to an external power supply through a connecting wire. Of course, it is not limited that the power supply connector 30 can only be set as the interfaces of the above models. In other embodiments, other interfaces can also be set as required. Those skilled in the art can set the number of power supply connectors 30 according to actual needs; for example, only one power supply connector 30 is set, or multiple power supply connectors 30 are set simultaneously. Preferably, on the basis of setting multiple power supply connectors 30 simultaneously, the models of each power supply connector 30 are different, so as to further improve the applicability of the device.

[0037] Refer to Figure 4 As shown, in some embodiments of the flow calibration auxiliary device of the present utility model, a second liquid outlet hole 123 is further opened on the valve body 10. When the valve body 10 is in the second state, the second liquid outlet hole 123 is communicated with the liquid inlet hole 121. When testing, the valve body 10 is adjusted to the second state, and its liquid inlet hole 121 is communicated with the test interface of the instrument to be tested. At this time, before the instrument performs a flow test, the liquid can be discharged through the second liquid outlet hole 123 first, so that after the pipeline pressure of the instrument is stable, the flow test is carried out. By setting this structure, the influence of factors such as unstable pipeline pressure of the instrument can be avoided as much as possible to ensure the accuracy of the flow test result. Preferably, when the liquid is discharged from the second liquid outlet hole 123, the liquid discharged from the second liquid outlet hole 123 is collected through a waste liquid container. The waste liquid container can be a measuring cup, a beaker, etc.

[0038] In this embodiment, the valve body 10 is set as a two-position three-way valve, which includes an electromagnetic valve 11 and a valve connection seat 12. The valve connection seat 12 is provided with a liquid inlet hole 121, a first liquid outlet hole 122, and a second liquid outlet hole 123 to realize the connection and disconnection between the holes through the electromagnetic valve 11. Preferably, the electromagnetic valve 11 is set as a medium-isolated micro rocker electromagnetic valve, and the valve connection seat 12 is set as a multi-channel electromagnetic valve connection seat.

[0039] Refer to Figure 3 and Figure 5 As shown, in some embodiments of the flow calibration auxiliary device of the present utility model, the control member 20 is configured to switch the valve body 10 to the first state when receiving a control signal; and switch the valve body 10 to the second state when receiving the control signal and after a preset time.

[0040] Those skilled in the art can set the control member 20 according to actual needs. In this embodiment, the control member 20 is set as a pulse-triggered delay time relay to conveniently realize the state switching of the valve body 10, effectively avoiding unnecessary errors in the test repeatability (RSD) of the test flow rate caused by lack of experience, reaction delay or subjective factors when manually switching the state, and ensuring the accuracy of the test results.

[0041] Furthermore, the power supply unit further includes a switch 50. The switch 50 includes an off state and a connected state and can switch between the two states. When the switch 50 switches from the off state to the connected state, a control signal is generated. By setting the switch 50, the on-off control of the circuit can be conveniently realized, and the safety and flexibility of the entire circuit are ensured.

[0042] Specifically, referring to Figure 5 As shown, the pulse-triggered delay time relay is electrically connected to the pressure regulating member 40. The switch 50 is arranged on the input terminal of the relay, and the valve body 10 is arranged on the normally closed end of the output terminal of the relay. When the switch 50 is off, the normally closed end of the relay is closed to supply power to the valve body 10 to keep it in the second state. At this time, the liquid inlet hole 121 is communicated with the second liquid outlet hole 123. Before the flow rate test, the liquid can be discharged through the second liquid outlet hole 123 to ensure the stability of the pipeline pressure and the accuracy of the test results; after the flow rate test is completed, the liquid inlet hole 121 can be separated from the first liquid outlet hole 122.

[0043] After the switch 50 is connected, the normally closed end of the relay is disconnected, and the valve body 10 switches from the second state to the first state. At this time, the liquid inlet hole 121 is communicated with the first liquid outlet hole 122, and the liquid is discharged into a container such as a measuring cup. After a preset time, the normally closed end is closed, and the valve body 10 switches to the second state to separate the liquid inlet hole 121 from the first liquid outlet hole 122, ending the liquid discharge from the first liquid outlet hole 122.

[0044] Those skilled in the art can set the length of the preset time according to actual needs. Exemplarily, it is set to 60s. That is, 60s after the switch 50 is connected, the normally closed end is closed again.

[0045] Furthermore, referring to Figure 3 As shown, in the flow rate calibration auxiliary device of the present invention, the flow rate measuring unit further includes a display 21. The display 21 is electrically connected to the control member 20, and the display 21 is at least used to display the remaining duration of the preset time. By setting the display 21 to display the remaining duration of the preset time, it is convenient for the staff to master the test state. In some embodiments, the display 21 can also be set according to actual needs. For example, the state of the valve body 10, the on-off state of the switch 50, etc. can be simultaneously displayed on the display 21.

[0046] Referring to Figure 1As shown, in some embodiments, the flow rate calibration auxiliary device of the present utility model further includes a protective case 60. An accommodation cavity is formed inside the protective case 60, and at least part of the flow measurement unit and the power supply unit are arranged in the accommodation cavity. By providing the protective case 60, it is possible to integrate each unit and facilitate portability. At the same time, it can also protect each unit from being damaged.

[0047] Preferably, the protective case 60 is subjected to a waterproof sealing treatment to prevent liquid from contacting the internal components of the case during the flow rate test, ensuring that each unit can operate normally. Exemplarily, at least part of the display 21, the switch 50, the valve connection seat 12, and the power supply connection member 30 are exposed outside the protective case 60 for the staff to interact, and the remaining components are arranged in the accommodation cavity to achieve protection.

[0048] Furthermore, referring to Figure 3 As shown, in some embodiments, the protective case 60 of the flow rate calibration auxiliary device of the present utility model includes a box body 61 and a cover body 62. Compared with an integrated structure, providing a split protective case 60 has a lower cost and is easier to assemble. Specifically, an open cavity 611 is formed on the box body 61, and the open cavity 611 mainly functions to accommodate various components. The cover body 62 is detachably connected to the box body 61, and those skilled in the art can set the detachable connection method between the two according to actual needs. When the two are assembled, the cover body 62 closes the opening of the open cavity 611 to form the accommodation cavity.

[0049] Exemplarily, the protective case 60 is provided in a cuboid shape. The pressure regulating member 40 is fixed to the bottom surface of the box body 61 by a stud. Two reserved mounting holes are formed on one side wall of the box body 61 for mounting the display 21 and the valve body 10 respectively. The control member 20 and the solenoid valve 11 are both installed inside the box body 61 by screws, and the valve connection seat 12 is arranged outside the box body 61. Another reserved mounting hole is formed on the other side wall of the box body 61 for mounting the power supply connection member 30. Preferably, the above two side walls are opposite side walls. A reserved mounting hole is also formed on the cover body 62, and the switch 50 is installed in this hole through a threaded structure and locked with a nut.

[0050] Furthermore, referring to Figure 6As shown, in some embodiments of the flow calibration auxiliary device of the present utility model, a first annular clamping portion 612 is provided on the surface of the box body 61 in contact with the cover body 62, and the first annular clamping portion 612 is arranged around the opening of the open cavity 611. A second annular clamping portion 621 adapted to the first annular clamping portion 612 is provided on the surface of the cover body 62 in contact with the box body 61, and the second annular clamping portion 621 is clamped and connected with the first annular clamping portion 612. Those skilled in the art can set the first annular clamping portion 612 and the second annular clamping portion 621 according to actual needs. In this embodiment, the first annular clamping portion 612 is set as an annular convex structure, and the second annular clamping portion 621 is set as an annular groove structure. By setting this structure, it is not only convenient for the positioning and assembly of the box body 61 and the cover body 62, but also can ensure the sealing effect at the connection between the two to achieve waterproofing.

[0051] Further, referring to Figure 3 and Figure 7 As shown, in some embodiments of the flow calibration auxiliary device of the present utility model, a first mounting hole 613 is provided on the box body 61, and a second mounting hole 622 corresponding to the first mounting hole 613 is provided on the cover body 62. The box body 61 and the cover body 62 are connected by fasteners installed in the first mounting hole 613 and the second mounting hole 622. Fasteners such as bolts and nuts will not be elaborated here. By setting this structure, the box body 61 and the cover body 62 can be effectively and firmly connected, ensuring the structural stability and reliability of the device.

[0052] Preferably, there are four first mounting holes 613 and second mounting holes 622 each, and they are correspondingly arranged at the four corners of the cuboid-shaped protective shell 60. Preferably, reinforcing ribs are provided at the parts of the box body 61 and the cover body 62 corresponding to the mounting holes to increase the structural strength. Preferably, the first mounting hole 613 and the second mounting hole 622 are both set as stepped holes so as to accommodate the fasteners through the stepped structures of the stepped holes, further improving the portability of the device.

[0053] Working principle:

[0054] After assembling the flow calibration auxiliary device with the instrument to be measured, the power bank and the device are electrically connected through a type-c connecting wire. At this time, the second liquid outlet hole 123 is communicated with the liquid inlet hole 121, and the instrument discharges liquid to the waste liquid container through the second liquid outlet hole 123 to stabilize the pressure of its pipeline.

[0055] After the pressure stabilizes, press the switch 50 to switch it from the off state to the connected state, generating a control signal. After receiving the control signal, the control member 20 switches the valve body 10 from the second state to the first state. At this time, the first liquid outlet hole 122 is communicated with the liquid inlet hole 121 to discharge the liquid into the measuring cup. While pressing the switch 50, the display 21 counts down from 60 s. After the countdown ends, the valve body 10 is switched from the first state to the second state, and the second liquid outlet hole 123 is communicated with the liquid inlet hole 121 to stop discharging the liquid into the measuring cup.

[0056] Obtain the volume of the liquid in the cup and combine it with the 60 s liquid discharge time, and the flow rate of the instrument can be calculated to calibrate the instrument according to the actual flow rate.

[0057] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A flow verification auxiliary device, characterized in that Comprising: A flow measurement unit, the flow measurement unit including a valve body and a control member; at least a liquid inlet hole and a first liquid outlet hole are formed in the valve body, the valve body includes a first state and a second state, when the valve body is in the first state, the liquid inlet hole is communicated with the first liquid outlet hole, when the valve body is in the second state, the liquid inlet hole is separated from the first liquid outlet hole; the control member is configured to make the valve body default to be in the second state when powered on, and be able to switch the state of the valve body when receiving a control signal; And An energy supply unit, the energy supply unit including a power supply connecting member and a voltage regulating member, the power supply connecting member is used for electrically connecting with an external power supply, the input end of the voltage regulating member is electrically connected with the power supply connecting member, the output end of the voltage regulating member is electrically connected with the flow measurement unit, and the voltage regulating member is used for converting the voltage output by the external power supply to supply power to the flow measurement unit.

2. The flow rate calibration auxiliary device according to claim 1, wherein: The power supply connecting member is set to any one of USB type-A, USB type-B, USB type-C, Mini-USB, and Micro-USB.

3. The flow rate verification auxiliary device according to claim 1, characterized in that: A second liquid outlet hole is further formed in the valve body, when the valve body is in the second state, the second liquid outlet hole is communicated with the liquid inlet hole.

4. The flow rate calibration auxiliary device according to any one of claims 1 to 3, characterized in that: The control member is configured to When receiving the control signal, switch the valve body to the first state; and When receiving the control signal and after a preset time, switch the valve body to the second state.

5. The flow rate calibration auxiliary device according to claim 4, characterized in that: The energy supply unit further includes a switch, the switch can be switched between an off state and a connected state; wherein, when the switch is switched from the off state to the connected state, the control signal is generated.

6. The flow rate calibration auxiliary device according to claim 4, wherein: The flow measurement unit further includes a display, the display is electrically connected with the control member, and the display is at least used for displaying the remaining duration of the preset time.

7. The flow rate calibration auxiliary device according to claim 1, characterized in that: Further includes a protective shell, an accommodating cavity is formed in the protective shell, at least part of the flow measurement unit and the energy supply unit are arranged in the accommodating cavity.

8. The flow rate calibration auxiliary device according to claim 7, characterized in that: The protective shell includes a box body and a cover body, an opening cavity is formed in the box body, the cover body is detachably connected with the box body, and the cover body closes the opening of the opening cavity to form the accommodating cavity.

9. The flow rate calibration auxiliary device according to claim 8, wherein: A first annular clamping portion is arranged on the surface of the box body contacting the cover body, and the first annular clamping portion is arranged around the opening of the opening cavity; A second annular clamping portion adapted to the first annular clamping portion is arranged on the surface of the cover body contacting the box body, and the second annular clamping portion is clamped and connected with the first annular clamping portion.

10. The flow rate calibration auxiliary device according to claim 8 or 9, characterized in that: A first mounting hole is formed in the box body, a second mounting hole corresponding to the first mounting hole is formed in the cover body, and the box body and the cover body are connected by fasteners installed in the first mounting hole and the second mounting hole.

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