Concentrated refrigerant filling machine for refrigerator cabinet and filling amount calibration method of filling machine

Abstract

The invention provides a refrigerator cabinet centralized type refrigerant filling machine and a filling amount calibration method of the filling machine, and relates to the technical field of refrigerant filling machines, the refrigerator cabinet centralized type refrigerant filling machine comprises a shell, a filling system and a refrigerant filling amount detection system, the filling system and the refrigerant filling amount detection system are arranged on the shell, and the refrigerant filling amount detection system comprises a metering assembly; the metering assembly comprises an electronic balance, a metering tank and an injection pipeline, the injection pipeline is detachably connected with the filling system, the filling system injects a refrigerant with a calibrated filling amount into the metering tank through the injection pipeline, and the electronic balance weighs the weight of the empty metering tank and the total weight after the refrigerant with the calibrated filling amount is injected into the metering tank. The actual filling amount is calculated through two times of weighing of the electronic balance, the error value is calculated according to the actual filling amount and the rated filling amount, and whether the filling amount of the filling machine is accurate or not is judged according to the error value and the preset threshold value range.

Description

Technical Field

[0001] The present application relates to the technical field of refrigerant filling machines, and in particular to a centralized refrigerant filling machine for refrigerator cabinets and a filling amount calibration method for the filling machine. Background Art

[0002] Refrigerators require refrigerants, and the refrigerant filling amount needs to be calibrated before daily production. The current calibration method is to take an empty bottle of metering tank, fill the quota of refrigerant into the empty metering tank, and the staff will measure the filling amount by weighing it before and after, and compare the measured filling amount with the set filling amount to determine whether the filling amount meets the standard and whether calibration is required.

[0003] The standard for the amount of refrigerant in a refrigerator cabinet is ±1g. When the staff detects the amount of refrigerant, the following errors are inevitable:

[0004] 1. During the weighing process, the staff will touch the measuring tank when taking it, and sometimes it is inevitable that there will be water vapor on the outside of the measuring tank. The refrigerant filling amount standard is ±1g. During the actual measurement process, the water vapor on the hands will stick to the measuring tank, resulting in measurement errors.

[0005] 2. The weighing balance needs to be put away and taken out every day. It is difficult to keep the level of the weighing balance consistent every day. Therefore, there is an error in the actual weighing measurement due to inconsistent weighing level.

[0006] 3. Different staff members have different operating habits during the sampling and weighing process, which also leads to measurement errors.

[0007] Based on the above situation, in order to solve the problem of large errors in manual detection of whether the filling amount is accurate, the present application specifically proposes a centralized refrigerant filling machine for refrigerator cabinets. Summary of the invention

[0008] The embodiment of the present application provides a centralized refrigerant filling machine for refrigerator cabinets and a filling amount calibration method for the filling machine, which integrates the metering tank and weighing scale into the refrigerant filling machine to form an integrated device. Since the metering tank and weighing scale are integrated into the filling machine, the staff does not need to directly contact them, thus avoiding the error caused by moisture on the hands and the error caused by different operating habits of different staff members; they are fixed in the same position and do not move, thus avoiding the measurement error caused by inconsistent horizontality of the weighing scale each time. The present application can completely avoid the existing measurement error problem and solve the problem of large error in manual detection of whether the filling amount is accurate.

[0009] In a first aspect, an embodiment of the present application provides a centralized refrigerant filling machine for a refrigerator cabinet, comprising a housing, and a filling system and a refrigerant filling amount detection system arranged on the housing;

[0010] The refrigerant filling amount detection system comprises a metering component, and the metering component comprises:

[0011] An electronic balance, the electronic balance being arranged in the inner cavity of the housing;

[0012] A measuring tank placed on the electronic balance, the electronic balance being configured to weigh a first weight and a second weight; the first weight being the weight of the empty measuring tank, and the second weight being the total weight of the measuring tank after a calibrated filling amount of refrigerant is injected;

[0013] An injection pipeline connected to the metering tank is detachably connected to the filling system, and the filling system injects a calibrated filling amount of refrigerant into the metering tank through the injection pipeline.

[0014] In a feasible implementation, the perfusion system includes a perfusion host and a perfusion pipeline connected to the perfusion host, and the perfusion pipeline is detachably connected to the injection pipeline.

[0015] In a feasible implementation, the perfusion pipeline includes a hose and a male connector fixed to one end of the hose, and the other end of the hose is connected to the perfusion host;

[0016] The injection pipeline includes an injection pipe and a female joint fixed to one end of the injection pipe, and the other end of the injection pipe is connected to the metering tank;

[0017] The female connector is butted against the male connector.

[0018] In a feasible implementation, the perfusion pipeline further includes a valve body and a flow meter;

[0019] The valve body and the flow meter are both arranged on the hose.

[0020] In a feasible implementation, the metering component also includes an emptying pipeline, which includes an emptying pipe and a pump body arranged on the emptying pipe, one end of the emptying pipe is connected to the metering tank, and the other end of the emptying pipe extends outside the shell.

[0021] In a feasible implementation, the metering component further includes a metering switch;

[0022] The metering switch is electrically connected to the electronic balance.

[0023] In a feasible implementation, the refrigerant filling amount detection system further includes a calculation storage module and a display module;

[0024] The calculation storage module stores a rated filling volume and a preset threshold range. The calculation storage module is configured to obtain the first weight and the second weight measured by the electronic balance, and calculate the difference between the second weight and the first weight to obtain a third weight; the calculation storage module is also configured to calculate the difference between the third weight and the rated filling volume to obtain a fourth weight, and confirm whether the fourth weight is within the preset threshold range, and judge in sequence;

[0025] The display module is configured to display the first weight, and / or the second weight, and / or the third weight, and / or the fourth weight.

[0026] In a feasible implementation, the perfusion system further includes a computing module and a main display module, and the perfusion host, the computing module and the main display module are electrically connected in sequence;

[0027] The computing storage module and the computing module are combined or provided separately;

[0028] The display module and the main display module are combined or provided separately.

[0029] In a second aspect, the present application further provides a filling machine filling amount calibration method, the filling machine filling amount calibration method is applied to the above-mentioned refrigerator cabinet centralized refrigerant filling machine, the filling machine filling amount calibration method comprises:

[0030] Turn on the electronic balance and measure the weight of the empty measuring tank, i.e. the first weight;

[0031] The male connector of the docking filling system and the female connector of the refrigerant filling amount detection system;

[0032] Open the filling system and inject the calibrated filling amount of refrigerant into the metering tank;

[0033] The electronic balance measures the weight of the metering tank after the refrigerant is injected, i.e., the second weight;

[0034] Calculating an actual injection volume, i.e., a third weight, from the first weight and the second weight;

[0035] Calculating a fourth weight based on the third weight and the rated filling volume;

[0036] If the fourth weight is within the preset threshold range, the filling amount of the filling machine is accurate;

[0037] If the fourth weight is not within the preset threshold range, the filling amount of the filling machine is inaccurate.

[0038] In a feasible implementation, the perfusion machine perfusion volume calibration method further includes:

[0039] After confirming that the filling volume of the filling machine is accurate, open the pump body and empty the metering tank.

[0040] The embodiment of the present application provides a centralized refrigerant filling machine for refrigerator cabinets. The filling system and the refrigerant filling amount detection system are arranged on the shell. The refrigerant filling amount detection system includes a metering component. The metering component includes an electronic balance, a metering tank, and an injection pipeline. The injection pipeline is detachably connected to the filling system. The filling system injects a calibrated filling amount of refrigerant into the metering tank through the injection pipeline. The electronic balance weighs the weight of the empty metering tank and the total weight of the metering tank after the calibrated filling amount of refrigerant is injected. The actual filling amount is calculated through two weighings of the electronic balance, and an error value is calculated based on the actual filling amount and the rated filling amount. According to the error value and a preset threshold range, it is determined whether the filling amount of the filling machine is accurate.

[0041] The present application integrates the metering tank and weighing scale into the refrigerant filling machine to form an integrated device. Since the metering tank and weighing scale are integrated into the filling machine, the staff does not need to directly contact them, thus avoiding the error caused by moisture on the hands and the error caused by different operating habits of different staff members; it is fixed in the same position and does not move, thus avoiding the measurement error caused by the inconsistent levelness of the weighing scale each time. The present application can completely avoid the current measurement error problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of a centralized refrigerant filling machine for refrigerator cabinets provided in the present application;

[0043] Figure 2 It is the structural block diagram of the centralized refrigerant filling machine for refrigerator cabinets;

[0044] Figure 3 It is a schematic diagram of the refrigerant filling structure;

[0045] Figure 4 It is a flow chart of the method for calibrating the filling volume of a filling machine provided in this application.

[0046] Description of reference numerals:

[0047] 100-shell; 200-filling system; 300-refrigerant filling amount detection system;

[0048] 210 - perfusion host; 220 - perfusion pipeline; 310 - metering component; 320 - calculation and storage module; 330 - display module;

[0049] 221-hose; 222-male connector; 223-valve body; 224-flow meter; 311-electronic balance; 312-metering tank; 313-injection pipe; 314-female connector; 315-emptying pipe; 316-pump body; 317-metering switch. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0051] Refrigerators require the use of refrigerants. Before refrigerant filling, the filling machine needs to be calibrated. Currently, it is mainly calibrated manually, which is easy to cause measurement errors. The centralized refrigerant filling machine for refrigerators provided in this application integrates the metering tank and weighing scale into the refrigerant filling machine to form an integrated device. Since the metering tank and weighing scale are concentrated in the filling machine, the staff does not need to directly contact them, thus avoiding errors caused by moisture on the hands and errors caused by different operating habits of different staff members; it is fixed in the same position and does not move, thus avoiding measurement errors caused by inconsistent horizontality of the weighing scale each time.

[0052] The specific structure of the centralized refrigerant filling machine for refrigerator cabinets provided in this application is described in detail below in conjunction with the accompanying drawings.

[0053] Reference Figure 1-Figure 3 As shown, the embodiment of the present application provides a centralized refrigerant filling machine for a refrigerator cabinet, comprising a housing 100 and a filling system 200 and a refrigerant filling amount detection system 300 arranged on the housing 100;

[0054] The shell 100 can be a rectangular parallelepiped made of metal. An inner cavity is provided in the shell 100. The filling system 200 and the refrigerant filling amount detection system 300 are arranged on the shell 100 or in the inner cavity. The two systems are integrated to form an integrated device.

[0055] The refrigerant filling amount detection system 300 includes a metering component 310, which is used to weigh and measure the refrigerant of the calibration filling amount to determine the accuracy of the filling amount of the filling machine;

[0056] The metering assembly 310 includes an electronic balance 311, a metering tank 312 and an injection pipeline;

[0057] The electronic balance 311 is a conventional electronic balance. Preferably, the electronic balance is an electromagnetic balance sensor, which uses the principle of electromagnetic force and object gravity balance, has accurate and reliable weighing, fast and clear display, and has automatic detection, calibration and overload protection devices. The electronic balance 311 is arranged in the inner cavity of the housing 100 and is placed horizontally at the bottom of the inner cavity;

[0058] The metering tank 312 is placed on the electronic balance 311. The tank body of the metering tank 312 is made of high-quality carbon steel, stainless steel and other materials. It can be vertical or horizontal. It can be selected according to the installation space and process requirements. The electronic balance 311 is configured to weigh a first weight and a second weight; the first weight is the weight of the empty metering tank 312, and the second weight is the total weight of the metering tank 312 after the calibrated filling amount of refrigerant is injected;

[0059] The injection pipeline is connected to the metering tank 312 , and the injection pipeline is detachably connected to the filling system 200 . The filling system 200 fills a calibrated filling amount of refrigerant into the metering tank 312 through the injection pipeline.

[0060] Before using the centralized refrigerant filling machine for refrigerator cabinets, it is calibrated first. During calibration, the metering tank 312 is placed on the electronic balance 311, and the electronic balance 311 weighs the first weight, that is, the weight of the empty metering tank 312. Then, the filling system 200 is turned on, and a calibrated filling amount of refrigerant is injected into the metering tank 312 through the injection pipeline. After injection, the electronic balance 311 weighs the second weight, that is, the weight of the metering tank 312 after the refrigerant is injected. The actual filling amount of the refrigerant is deducted from the first weight from the second weight. The difference between the actual filling amount and the calibrated filling amount is calculated. If the difference is within the preset threshold range, the filling amount of the filling machine is accurate; if the difference is not within the preset threshold range, the filling amount of the filling machine is inaccurate.

[0061] The present application integrates the metering tank and weighing scale into the refrigerant filling machine to form an integrated device. Since the metering tank and weighing scale are integrated into the filling machine, the staff does not need to directly contact them, thus avoiding the error caused by moisture on the hands and the error caused by different operating habits of different staff members; it is fixed in the same position and does not move, thus avoiding the measurement error caused by the inconsistent levelness of the weighing scale each time. The present application can completely avoid the current measurement error problem.

[0062] Reference Figure 1 and Figure 2 As shown, in some embodiments, the perfusion system 200 includes a perfusion host 210 and a perfusion pipeline 220 connected to the perfusion host 210, and the perfusion pipeline 220 is detachably connected to the injection pipeline;

[0063] The filling host 210 is a conventional refrigerant filling machine, which mainly includes a compressor, a liquid storage tank, a pipeline, a control valve, and a controller. The filling host 210 pressurizes the refrigerant through the compressor, and presses it from the liquid storage tank through the pipeline and the control valve into the filling pipeline 220 to complete the filling;

[0064] The filling pipeline 220 is detachably connected to the injection pipeline. During calibration, the filling pipeline 220 is connected to the injection pipeline to inject a calibrated filling amount of refrigerant into the metering tank 312; when in use, the filling pipeline 220 is connected to the refrigerator cabinet to inject refrigerant into the refrigerator cabinet.

[0065] Reference Figure 1-Figure 3 As shown, in some embodiments, the perfusion pipeline 220 includes a hose 221 and a male connector 222 fixed to one end of the hose 221, and the other end of the hose 221 is connected to the perfusion host 210;

[0066] The injection pipeline includes an injection pipe 313 and a female connector 314 fixed to one end of the injection pipe 313, and the other end of the injection pipe 313 is connected to the metering tank 312;

[0067] Both the injection pipe 313 and the hose 221 can be high-pressure hoses, one end of the high-pressure hose is connected to the injection host 210, and the other end is connected to the male connector 222, one end of the injection pipe 313 is connected to the metering tank 312, and the other end is connected to the female connector 314, and the female connector 314 and the male connector 222 can be connected;

[0068] In the piping system, male connectors and female connectors are common connection methods used to connect pipes, valves, equipment and other components. The male connector can be a connector with external threads, and the female connector can be a connector with internal threads. The threads of the male connector are screwed into the female connector to form a firm connection. The threads and sealing materials ensure that there is no leakage at the connection. Threaded connections are easy to install and disassemble, and are suitable for occasions that require frequent maintenance.

[0069] Reference Figure 1 and Figure 2 As shown, in some embodiments, the perfusion line 220 further includes a valve body 223 and a flow meter 224;

[0070] The valve body 223 and the flow meter 224 are both arranged on the hose 221. The valve body 223 is used to control the flow of refrigerant. The valve body 223 can be a ball valve, a butterfly valve, a check valve, etc. The flow meter 224 is used to measure the total amount of refrigerant flowing through the hose 211. The flow meter 224 can be a differential pressure flow meter, a rotor flow meter, an electromagnetic flow meter, etc.

[0071] Reference Figure 1 and Figure 2As shown, in some embodiments, the metering assembly 310 further includes an emptying pipeline, which is used to discharge the refrigerant in the metering tank 312, and to empty the metering tank 312. The emptying pipeline can be connected to the liquid storage tank of the perfusion host 210 to discharge the refrigerant in the metering tank 312 into the liquid storage tank of the perfusion host 210;

[0072] The emptying pipeline includes an emptying pipe 315 and a pump body 316 disposed on the emptying pipe 315. One end of the emptying pipe 315 is connected to the metering tank 312, and the other end of the emptying pipe 315 extends to the outside of the housing 100.

[0073] The emptying pipe 315 may be a high-pressure hose, one end of which is connected to the bottom end of the metering tank 312, and the other end of which extends to the outside of the housing 100 or is connected to the liquid storage tank of the perfusion host 210;

[0074] The pump body 316 is used to drive the refrigerant to flow, and the type of the pump body 316 is not limited.

[0075] Reference Figure 1 As shown, in some embodiments, the metering assembly 310 further includes a metering switch 317;

[0076] The metering switch 317 is a conventional control switch, and the metering switch 317 is electrically connected to the electronic balance 311 .

[0077] Reference Figure 1-Figure 2 As shown, in some embodiments, the refrigerant filling amount detection system 300 further includes a calculation storage module 320 and a display module 330;

[0078] The calculation storage module 320 stores the rated filling volume and the preset threshold range. The calculation storage module 320 is configured to obtain the first weight and the second weight measured by the electronic balance 311, and calculate the difference between the second weight and the first weight to obtain a third weight; the calculation storage module 320 is also configured to calculate the difference between the third weight and the rated filling volume to obtain a fourth weight, and confirm whether the fourth weight is within the preset threshold range, and judge in sequence;

[0079] The display module 330 is configured to display the first weight, and / or the second weight, and / or the third weight, and / or the fourth weight.

[0080] In some embodiments, the perfusion system 200 further includes a computing module and a main display module, and the perfusion host 210, the computing module and the main display module are electrically connected in sequence;

[0081] The computing storage module 320 is combined with the computing module, or is set separately;

[0082] The display module 330 and the main display module are combined or provided separately.

[0083] Reference Figure 4 As shown, the present application also provides a filling machine filling amount calibration method, which is applied to the above-mentioned refrigerator cabinet centralized refrigerant filling machine, and the filling machine filling amount calibration method includes:

[0084] S10: Measure the weight of the empty measuring tank, that is, the first weight.

[0085] During calibration, the measuring tank is placed on an electronic balance, the electronic balance is turned on, and the weight of the empty measuring tank is measured, that is, the first weight.

[0086] S20: Butt-joint male and female connectors.

[0087] The male connector of the charging system and the female connector of the refrigerant charging amount detection system are connected, and the male connector and the female connector are screwed together to connect the charging pipeline with the injection pipeline.

[0088] S30: Inject a calibrated amount of refrigerant into the metering tank.

[0089] Turn on the filling system and start the compressor of the filling host. The compressor pressurizes the refrigerant and presses it from the liquid storage tank into the filling pipeline through the pipeline and the control valve. The refrigerant is then discharged into the metering tank through the injection pipeline. The total amount of refrigerant flowing through the hose is controlled by the flow meter to ensure that the calibrated filling amount of refrigerant is injected into the metering tank.

[0090] S40: Measure a second weight.

[0091] Turn on the electronic balance and measure the weight of the metering tank after the refrigerant is injected, which is the second weight.

[0092] S50: Calculate a third weight based on the first weight and the second weight.

[0093] The actual injection amount, ie, the third weight, is calculated from the first weight and the second weight. The third weight is obtained by subtracting the first weight from the second weight.

[0094] S60: Calculate a fourth weight based on the third weight and the rated filling volume.

[0095] The difference, ie, the fourth weight, is calculated by subtracting the rated filling volume from the third weight.

[0096] S70: Compare the fourth weight with a preset threshold value to determine whether the filling amount of the filling machine is accurate.

[0097] If the fourth weight is within the preset threshold range, the filling amount of the filling machine is accurate;

[0098] If the fourth weight is not within the preset threshold range, the filling amount of the filling machine is inaccurate.

[0099] In some embodiments, the perfusion machine perfusion volume calibration method further includes:

[0100] After confirming that the filling volume of the filling machine is accurate, open the pump body and empty the metering tank.

[0101] Empty the measuring tank to facilitate the next calibration.

[0102] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on the several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0103] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A centralized refrigerant filling machine for refrigerator cabinets, characterized in that: It comprises a shell (100), and a filling system (200) and a refrigerant filling amount detection system (300) arranged on the shell (100); The refrigerant filling amount detection system (300) comprises a metering component (310), and the metering component (310) comprises: An electronic balance (311), the electronic balance (311) being arranged in the inner cavity of the housing (100); a metering tank (312) placed on the electronic balance (311), the electronic balance (311) being configured to weigh a first weight and a second weight; the first weight being the weight of the empty metering tank (312), and the second weight being the total weight after a calibrated filling amount of refrigerant is injected into the metering tank (312); An injection pipeline connected to the metering tank (312), the injection pipeline being detachably connected to the filling system (200), and the filling system (200) injecting a calibrated filling amount of refrigerant into the metering tank (312) through the injection pipeline.

2. The centralized refrigerant filling machine for refrigerator cabinets according to claim 1, characterized in that: The perfusion system (200) comprises a perfusion host (210) and a perfusion pipeline (220) connected to the perfusion host (210), wherein the perfusion pipeline (220) is detachably connected to the injection pipeline.

3. The centralized refrigerant filling machine for refrigerator cabinets according to claim 2, characterized in that: The perfusion pipeline (220) comprises a hose (221) and a male connector (222) fixedly arranged at one end of the hose (221); the other end of the hose (221) is connected to the perfusion host (210); The injection pipeline comprises an injection pipe (313) and a female connector (314) fixed to one end of the injection pipe (313); the other end of the injection pipe (313) is connected to the metering tank (312); The female connector (314) is docked with the male connector (222).

4. The centralized refrigerant filling machine for refrigerator cabinets according to claim 3, characterized in that: The perfusion pipeline (220) further includes a valve body (223) and a flow meter (224); The valve body (223) and the flow meter (224) are both arranged on the hose (221).

5. The centralized refrigerant filling machine for refrigerator cabinets according to claim 1, characterized in that: The metering component (310) further comprises an emptying pipeline, wherein the emptying pipeline comprises an emptying pipe (315) and a pump body (316) disposed on the emptying pipe (315), one end of the emptying pipe (315) is connected to the metering tank (312), and the other end of the emptying pipe (315) extends to the outside of the housing (100).

6. The centralized refrigerant filling machine for refrigerator cabinets according to claim 5, characterized in that: The metering component (310) further includes a metering switch (317); The metering switch (317) is electrically connected to the electronic balance (311).

7. The centralized refrigerant filling machine for refrigerator cabinets according to claim 1, characterized in that: The refrigerant filling amount detection system (300) further includes a calculation storage module (320) and a display module (330); The calculation storage module (320) stores a rated filling volume and a preset threshold range. The calculation storage module (320) is configured to obtain the first weight and the second weight measured by the electronic balance (311), and calculate the difference between the second weight and the first weight to obtain a third weight; the calculation storage module (320) is also configured to calculate the difference between the third weight and the rated filling volume to obtain a fourth weight, and confirm whether the fourth weight is within the preset threshold range, and judge in sequence; The display module (330) is configured to display the first weight, and / or the second weight, and / or the third weight, and / or the fourth weight.

8. The centralized refrigerant filling machine for refrigerator cabinets according to claim 7, characterized in that: The perfusion system (200) further comprises a computing module and a main display module, wherein the perfusion host (210), the computing module and the main display module are electrically connected in sequence; The computing storage module (320) is combined with the computing module, or is set separately; The display module (330) and the main display module are combined or provided separately.

9. A method for calibrating the filling volume of a filling machine, characterized in that: The filling amount calibration method of the filling machine is applied to the centralized refrigerant filling machine for refrigerator cabinets as described in any one of claims 1 to 8, and the filling amount calibration method of the filling machine comprises: Turn on the electronic balance and measure the weight of the empty measuring tank, i.e. the first weight; The male connector of the docking filling system and the female connector of the refrigerant filling amount detection system; Open the filling system and inject the calibrated filling amount of refrigerant into the metering tank; The electronic balance measures the weight of the metering tank after the refrigerant is injected, i.e., the second weight; Calculating an actual injection volume, i.e., a third weight, from the first weight and the second weight; Calculating a fourth weight based on the third weight and the rated filling volume; If the fourth weight is within the preset threshold range, the filling amount of the filling machine is accurate; If the fourth weight is not within the preset threshold range, the filling amount of the filling machine is inaccurate.

10. The method for calibrating the filling volume of a filling machine according to claim 9, characterized in that: The perfusion machine perfusion volume calibration method also includes: After confirming that the filling volume of the filling machine is accurate, open the pump body and empty the metering tank.

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