Movable automatic refrigerant filling device

Abstract

The utility model provides a mobile refrigerant automatic filling device, including control switch, automatic filling cabinet, control cabinet and host computer, wherein the automatic filling cabinet is provided with a filling module, a first refrigerant module, a second refrigerant module and a safety module, the control cabinet is provided with a direct current power supply and a programmable logic controller, and the host computer is provided with an upper computer. The communication module, the solid-state relay group, the first refrigerant module and the second refrigerant module are used for filling refrigerants into the air conditioner through the filling module; the communication module is used for communication among the charging module, the first refrigerant module, the second refrigerant module, the safety module, the programmable logic controller and the upper computer, and the programmable logic controller judges the on-off state of the solid-state relay set according to the state of the control switch. And the direct-current power supply is used for supplying power. According to the device, the refrigerant can be automatically injected into the air conditioning system.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration equipment, in particular to a mobile automatic refrigerant filling device used for air-conditioning performance testing. Background Art

[0002] The amount of refrigerant charged has a great impact on the performance of the air conditioner. Therefore, when conducting performance matching experiments, R&D personnel and test personnel will constantly adjust the refrigerant charge to achieve the optimal state.

[0003] The current common practice is to place the refrigerant tank on an electronic scale, connect it to the air conditioner, and use weighing to determine the refrigerant charge.

[0004] The new refrigerant R290 (propane) has the potential to replace R22 and R410A refrigerants with its environmental protection, high efficiency and excellent energy saving performance. R290 is a new environmentally friendly refrigerant, mainly used in central air conditioners, heat pump air conditioners, household air conditioners and other small refrigeration equipment. However, due to the explosive characteristics of R290, leakage should be monitored during filling and use, and corresponding preventive and prevention measures should be taken. Utility Model Content

[0005] The purpose of the utility model is to provide a mobile automatic refrigerant filling device, which can automatically fill refrigerant into an air-conditioning system. The device can be used for automatic filling of various refrigerants (including flammable refrigerants) with an accuracy of ±1g.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A mobile automatic refrigerant filling device comprises a control switch, an automatic filling cabinet, a control cabinet and a host computer, wherein a filling module, a first refrigerant module, a second refrigerant module and a safety module are arranged in the automatic filling cabinet, a DC power supply, a programmable logic controller, a communication module and a solid-state relay group are arranged in the control cabinet, the first refrigerant module and the second refrigerant module both fill refrigerant into the air conditioner through the filling module, the safety module is connected with the first refrigerant module and the second refrigerant module, and is used to prevent the pressure in the first refrigerant module and the second refrigerant module from being too high, the communication module is used for communication between the filling module, the first refrigerant module, the second refrigerant module, the safety module, the programmable logic controller and the host computer, the solid-state relay group is connected with the programmable logic controller and each solenoid valve, and is used to control the on and off of the solenoid valve, the control switch is connected with the programmable logic controller and provides a control signal to the programmable logic controller, the programmable logic controller judges the on and off state of the solid-state relay group according to the state of the control switch, and the DC power supply is used for power supply.

[0008] Further, in the above-mentioned mobile refrigerant automatic filling device, the first refrigerant module includes a first storage tank, a first replenishing pipeline, a first filling pipeline, a first filling solenoid valve, a first storage tank replenishing solenoid valve, a first storage tank replenishing control manual valve and a first one-way valve, the first storage tank is used to store the first refrigerant, the first replenishing pipeline is used to replenish the first refrigerant into the first storage tank, the first storage tank replenishing solenoid valve is used to control the on-off of the first replenishing pipeline, the first storage tank replenishing control manual valve is arranged on the first replenishing pipeline and is located upstream of the first storage tank replenishing solenoid valve, the first refrigerant flows out from the first storage tank to the first filling pipeline, the first filling solenoid valve is used to control the on-off of the first filling pipeline, and the first one-way valve is used to prevent the second refrigerant from flowing into the first refrigerant module.

[0009] Furthermore, in the above-mentioned mobile refrigerant automatic filling device, the first refrigerant module also includes a first temperature sensor and a first pressure sensor, the first temperature sensor is used to detect the temperature of the first refrigerant in the first storage tank; the first pressure sensor is used to detect the pressure of the first refrigerant in the first storage tank.

[0010] Further, in the above-mentioned mobile refrigerant automatic filling device, the second refrigerant module includes a second storage tank, a second replenishing pipeline, a second filling pipeline, a second filling solenoid valve, a second storage tank replenishing solenoid valve, a second storage tank replenishing control manual valve and a second one-way valve, the second storage tank is used to store the second refrigerant, the second replenishing pipeline is used to replenish the second refrigerant into the second storage tank, the second storage tank replenishing solenoid valve is used to control the on-off of the second replenishing pipeline, the second storage tank replenishing control manual valve is arranged on the second replenishing pipeline and is located upstream of the second storage tank replenishing solenoid valve, the second refrigerant flows out from the second storage tank to the second filling pipeline, the second filling solenoid valve is used to control the on-off of the second filling pipeline, and the second one-way valve is used to prevent the first refrigerant from flowing into the first refrigerant module.

[0011] Furthermore, in the above-mentioned mobile refrigerant automatic filling device, the second refrigerant module also includes a second temperature sensor, a second pressure sensor and a second liquid level sensor, the second temperature sensor is used to detect the temperature of the second refrigerant in the second storage tank; the second pressure sensor is used to detect the pressure of the second refrigerant in the second storage tank.

[0012] Furthermore, in the above-mentioned mobile refrigerant automatic filling device, the filling module includes a gas-liquid separator, a third filling pipeline, a fourth filling pipeline, a fifth filling pipeline, a mass flow meter, a refrigerant filling main control solenoid valve, a capillary tube, a branch pipe, a refrigerant filling coarse control solenoid valve and a filling module control manual valve, one end of the gas-liquid separator is connected to both the first filling pipeline and the second filling pipeline, the other end of the gas-liquid separator is connected to the first end of the third filling pipeline, the second end of the third filling pipeline is connected to the mass flow meter, and the other end of the mass flow meter is connected to the refrigerant The charging main control solenoid valve is connected, the mass flowmeter is connected to the communication module, the other end of the refrigerant charging main control solenoid valve is connected to the first end of the fourth charging pipeline, the second end of the fourth charging pipeline is connected to one end of the capillary tube, the third end of the fourth charging pipeline is connected to the branch pipe, the other end of the capillary tube is connected to the first end of the fifth charging pipeline, the other end of the branch pipe is connected to the second end of the fifth charging pipeline, the refrigerant charging coarse control solenoid valve is arranged on the branch pipe, and the charging module control manual valve is arranged on the third end of the fifth charging pipeline.

[0013] Furthermore, in the above-mentioned mobile refrigerant automatic filling device, the filling module also includes a vacuum pipe and a system vacuum control manual valve, the vacuum pipe is connected to the third end of the third filling pipeline, and the system vacuum control manual valve is arranged on the vacuum pipe.

[0014] Furthermore, in the above-mentioned mobile refrigerant automatic filling device, the safety module includes a first pressure relief valve, a second pressure relief valve, a third storage tank and a pressure alarm, one end of the first pressure relief valve is connected to the first storage tank, and the other end is connected to the third storage tank, which is used to prevent the pressure in the first storage tank from being too high, one end of the second pressure relief valve is connected to the second storage tank, and the other end is connected to the third storage tank, which is used to prevent the pressure in the second storage tank from being too high, and the pressure alarm is connected to the third storage tank, which is used to monitor the pressure changes in the third storage tank.

[0015] Furthermore, in the above-mentioned mobile refrigerant automatic filling device, the first refrigerant in the first refrigerant module and the second refrigerant in the second refrigerant module are different types of refrigerants, and one or both of the first refrigerant and the second refrigerant are flammable refrigerants.

[0016] Furthermore, in the above-mentioned mobile refrigerant automatic filling device, the host computer is connected to the communication module, the programmable logic controller is connected to the communication module, and an analog quantity acquisition module is provided in the programmable logic controller, and the analog quantity acquisition module is used to collect the temperature and pressure in the first refrigerant module and the second refrigerant module. The host computer determines the state of the refrigerant in the first refrigerant module and the second refrigerant module in real time according to the data of the analog quantity acquisition module, and controls the filling of refrigerant into the air conditioner according to a preset program.

[0017] Furthermore, in the above-mentioned mobile refrigerant automatic filling device, a flammable refrigerant alarm is also included. The flammable refrigerant alarm is connected to the communication module and is used to detect whether the flammable refrigerant is leaking and to alarm through an indicator light, an APP and a host computer software.

[0018] From the analysis, it can be known that the utility model discloses a mobile automatic refrigerant filling device, which can automatically fill the air-conditioning system with refrigerant. The device can be used for automatic filling of various refrigerants with an accuracy of ±1g. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0020] Figure 1 A schematic structural diagram of an embodiment of the utility model.

[0021] Explanation of the reference numerals: 1. Automatic filling cabinet; 11. Filling module; 111. Mass flow meter; 112. System vacuum control manual valve; 113. Refrigerant filling main control solenoid valve; 114. Capillary tube; 115. Refrigerant filling coarse control solenoid valve; 116. Filling module control manual valve; 117. Gas-liquid separator; 118. Third filling pipeline; 119. Fourth filling pipeline; 120. Fifth filling pipeline; 12. First refrigerant module; 121. First storage tank; 122. First temperature sensor; 123. First pressure sensor; 124. First one-way valve; 125. First filling solenoid valve; 126. First storage tank replenishment solenoid valve; 127. First storage tank replenishment Control manual valve; 13. Second refrigerant module; 131. Second storage tank; 132. Second temperature sensor; 133. Second pressure sensor; 134. Second one-way valve; 135. Second charging solenoid valve; 136. Second storage tank replenishing solenoid valve; 137. Second storage tank replenishing control manual valve; 14. Safety module; 141. Third storage tank; 142. First pressure relief valve; 143. Second pressure relief valve; 144. Pressure alarm; 15. First flammable refrigerant alarm; 16. Second flammable refrigerant alarm; 2. Control cabinet; 21. DC power supply; 22. Programmable logic controller; 23. Analog quantity acquisition module; 24. Communication module; 25. Solid-state relay group. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention includes such modifications and variations within the scope of the appended claims and their equivalents.

[0023] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] One or more examples of the utility model are shown in the attached drawings. The detailed description uses numbers and letters to refer to the features in the drawings. Similar or similar marks in the drawings and descriptions have been used to refer to similar or similar parts of the utility model. As used herein, the terms "first", "second", and "third" etc. are used interchangeably to distinguish one component from another, and are not intended to indicate the position or importance of individual components.

[0025] like Figure 1As shown, according to an embodiment of the utility model, a mobile refrigerant automatic filling device is provided, including a control switch, an automatic filling cabinet 1 and a control cabinet 2, wherein a filling module 11, a first refrigerant module 12, a second refrigerant module 13, a safety module 14, a first flammable refrigerant alarm 15 and a second flammable refrigerant alarm 16 are arranged in the automatic filling cabinet 1, and a DC power supply 21, a programmable logic controller 22 (PLC), a communication module 24 and a solid-state relay group 25 are arranged in the control cabinet 2. The first refrigerant module 12 and the second refrigerant module 13 are both charged with refrigerant to the air conditioner through the charging module 11. The safety module 14 is used to prevent the pressure in the first refrigerant module 12 and the second refrigerant module 13 from being too high. The first flammable refrigerant alarm 15 and the second flammable refrigerant alarm 16 are used for refrigerant leakage alarm. The communication module 24 is used for communication between the charging module 11, the first refrigerant module 12, the second refrigerant module 13, the programmable logic controller 22 and the host computer. The solid-state relay group 25 is connected to the programmable logic controller 22 and each solenoid valve to control the on and off of the solenoid valve. The control switch is connected to the programmable logic controller 22 and provides a control signal to the programmable logic controller 22. The programmable logic controller 22 determines the on and off state of the solid-state relay group 25 according to the state of the control switch. The DC power supply 21 is used for power supply. The devices powered by the DC power supply 21 include: the programmable logic controller 22 (PLC), the solid-state relay group 25, the indicator light, each solenoid valve, the mass flow meter 111, each temperature sensor, and each pressure sensor. The mobile automatic refrigerant charging device can be moved to the vicinity of equipment that needs to be charged with refrigerant to automatically charge the refrigerant.

[0026] Preferably, the first refrigerant module 12 includes a first storage tank 121, a first supplementary pipeline, a first charging pipeline, a first charging solenoid valve 125, a first one-way valve 124, a first storage tank supplementary solenoid valve 126 and a first storage tank supplementary control manual valve 127. The first storage tank 121 is used to store the first refrigerant, the first supplementary pipeline is used to supplement the first refrigerant into the first storage tank 121, and the first storage tank supplementary solenoid valve 126 is used to control the on-off of the first supplementary pipeline; the first storage tank supplementary control manual valve 127 is arranged on the first supplementary pipeline and located upstream of the first storage tank supplementary solenoid valve 126, the first refrigerant flows out from the first storage tank 121 to the first charging pipeline, and the first charging solenoid valve 125 is used to control the on-off of the first charging pipeline. The first one-way valve 124 is arranged between the gas-liquid separator 117 and the first charging solenoid valve 125, and the first one-way valve 124 is used to prevent the second refrigerant from flowing into the first refrigerant module 12.

[0027] The first storage tank replenishment solenoid valve 126 is connected to the first storage tank 121 and the first storage tank replenishment control manual valve 127, and is used to control the on-off of the pipeline (first replenishment pipeline) for replenishing the first refrigerant into the first storage tank 121; the first filling solenoid valve 125 is connected to the first storage tank 121 and the gas-liquid separator 117, and is used to control the outflow of the first refrigerant in the first storage tank 121.

[0028] The first refrigerant module 12 further includes a first temperature sensor 122 and a first pressure sensor 123. The first temperature sensor 122 is disposed inside the first storage tank 121, connected to the analog quantity acquisition module 23, and used to detect the temperature of the first refrigerant in the first storage tank 121. The first pressure sensor 123 is disposed inside the first storage tank 121, connected to the analog quantity acquisition module 23, and used to detect the pressure of the first refrigerant in the first storage tank 121.

[0029] Preferably, the second refrigerant module 13 includes a second storage tank 131, a second supplementary pipeline, a second charging pipeline, a second charging solenoid valve 135, a second one-way valve 134, a second storage tank supplementary solenoid valve 136 and a second storage tank supplementary control manual valve 137. The second storage tank 131 is used to store the second refrigerant. The second supplementary pipeline is used to supplement the second refrigerant into the second storage tank 131. The second storage tank supplementary solenoid valve 136 is used to control the on-off of the second supplementary pipeline. The second storage tank supplementary control manual valve 137 is arranged on the second supplementary pipeline and is located upstream of the second storage tank supplementary solenoid valve 136. The second refrigerant flows out from the second storage tank 131 to the second charging pipeline. The second charging solenoid valve 135 is used to control the on-off of the second charging pipeline. The second one-way valve 134 is arranged between the gas-liquid separator 117 and the second charging solenoid valve 135. The second one-way valve 134 is used to prevent the first refrigerant from flowing into the second refrigerant module 13.

[0030] The second storage tank replenishment solenoid valve 136 is connected to the second storage tank 131 and the second storage tank replenishment control manual valve 137, and is used to control the on-off of the pipeline (second replenishment pipeline) for replenishing the second refrigerant into the second storage tank 131; the second filling solenoid valve 135 is connected to the second storage tank 131 and the gas-liquid separator 117, and is used to control the outflow of the second refrigerant in the second storage tank 131.

[0031] The second refrigerant module 13 further includes a second temperature sensor 132 and a second pressure sensor 133. The second temperature sensor 132 is disposed inside the second storage tank 131 and connected to the analog quantity acquisition module 23 to detect the temperature of the second refrigerant in the second storage tank 131. The second pressure sensor 133 is disposed inside the second storage tank 131 and connected to the analog quantity acquisition module 23 to detect the pressure of the second refrigerant in the second storage tank 131.

[0032] The charging module 11 includes a gas-liquid separator 117, a third charging pipeline 118, a fourth charging pipeline 119, a fifth charging pipeline 120, a mass flow meter 111, a refrigerant charging main control solenoid valve 113, a capillary tube 114, a refrigerant charging coarse control solenoid valve 115 and a charging module control manual valve 116. The first end of the third charging pipeline 118 is connected to the gas-liquid separator 117, the second end of the third charging pipeline 118 is connected to the mass flow meter 111, the third end of the third charging pipeline 118 is connected to the system vacuum control manual valve 112, and the other end of the mass flow meter 111 is connected to the refrigerant charging main control solenoid valve 113. The mass flowmeter 111 is connected to the communication module 24, the other end of the refrigerant charging main control solenoid valve 113 is connected to the first end of the fourth charging pipeline 119, the second end of the fourth charging pipeline 119 is connected to the capillary 114, the third end of the fourth charging pipeline 119 is connected to the refrigerant charging coarse control solenoid valve 115, the other end of the capillary 114 is connected to the first end of the fifth charging pipeline 120, the other end of the refrigerant charging coarse control solenoid valve 115 is connected to the second end of the fifth charging pipeline 120, and the third end of the fifth charging pipeline 120 is connected to the charging module control manual valve 116.

[0033] The mass flow meter 111 is connected to the host computer through the communication module 24. The mass flow meter 111 is used to detect the mass of the first refrigerant and the second refrigerant. The host computer is connected to the programmable logic controller 22 through the communication module 24. The programmable logic controller (PLC) 22 is connected to the solid-state relay group 25. The solid-state relay group 25 is connected to the solenoid valve (125, 135, 113, 115). The programmable logic controller 22 controls the charging accuracy of the first refrigerant and the second refrigerant to reach ±1g through the solid-state relay group 25. The mass flow meter 111 is used to detect the mass of the refrigerant when it is charged.

[0034] The refrigerant charging main control solenoid valve 113 and the refrigerant charging coarse control solenoid valve 115 are connected to the programmable logic controller (PLC) 22 through the solid-state relay group 25, and are used to control the on-off of the entire charging pipeline to ensure the accuracy of the charging amount and control the charging accuracy of the first refrigerant and the second refrigerant to reach ±1g.

[0035] The capillary tube 114 is connected to the refrigerant charging main control solenoid valve 113 and the charging module control manual valve 116. The capillary tube 114 is used to control the speed of refrigerant charging and control the charging accuracy of the first refrigerant and the second refrigerant to reach ±1g.

[0036] The filling module control manual valve 116 is connected to the external interface of the automatic filling device and the internal pipe of the device as a main valve, and is used to control the closing of the filling module 11.

[0037] The refrigerant charging coarse control solenoid valve 115, the refrigerant charging main control solenoid valve 113 and the charging module control manual valve 116 are all connected to control the on-off of the fast charging pipeline. The refrigerant charging main control solenoid valve 113 is used to control the on-off of the entire charging pipeline.

[0038] The charging module 11 further includes a system vacuum control manual valve 112 , which is connected to the third end of the third charging pipeline 118 and is used to evacuate the charging module 11 before charging the air conditioner with refrigerant.

[0039] The first refrigerant in the first refrigerant module 12 and the second refrigerant in the second refrigerant module 13 are the same type of refrigerants, and both the first refrigerant and the second refrigerant are flammable refrigerants.

[0040] When two different refrigerants need to be added, the first refrigerant in the first refrigerant module 12 and the second refrigerant in the second refrigerant module 13 are different types of refrigerants, and one or both of the first refrigerant and the second refrigerant are flammable refrigerants. The first storage tank 121 and the second storage tank 131 can use a 1.2L tank body, the tank body thickness is not less than 3mm, and the pressure resistance is not less than 4Mpa.

[0041] Preferably, the safety module 14 includes a third storage tank 141, a first pressure relief valve 142, a second pressure relief valve 143 and a pressure alarm 144. The pressure alarm 144 is connected to the third storage tank to monitor the pressure change in the third storage tank. The first pressure relief valve 142 is connected to the first refrigerant module 12 (first storage tank 121). When the pressure of the first refrigerant module 12 exceeds the limit value, the first pressure relief valve 142 connects the third storage tank 141 with the first refrigerant module 12 to reduce the pressure in the first storage tank 121, and the pressure alarm 144 detects the pressure change alarm. The second pressure relief valve 143 is connected to the second refrigerant module 13 (second storage tank 131). When the pressure of the second refrigerant module 13 exceeds the limit value, the second pressure relief valve 143 connects the third storage tank 141 with the second refrigerant module 13 to reduce the pressure in the second storage tank 131, and the pressure alarm 144 detects the pressure change alarm.

[0042] The pressure alarm 144 is connected to the programmable logic controller (PLC) 22 and can send an alarm signal to the programmable logic controller (PLC) 22.

[0043] Preferably, it also includes a host computer, which is connected to the communication module 24. The programmable logic controller 22 is provided with an analog quantity acquisition module 23, which is connected to the communication module 24 through the programmable logic controller 22. The analog quantity acquisition module 23 is used to collect the temperature and pressure in the first refrigerant module 12 and the second refrigerant module 13. The host computer determines the state of the refrigerant in the first refrigerant module 12 and the second refrigerant module 13 in real time according to the data of the analog quantity acquisition module 23. It avoids the refrigerant in the first storage tank 121 and the second storage tank 131 from being reduced when the host computer is not connected, and avoids the filling being in a state of stagnation for a long time. At the same time, the host computer can also switch the filling between the first refrigerant module 12 and the second refrigerant module 13 according to the state of the refrigerant.

[0044] It also includes a flammable refrigerant alarm (a first flammable refrigerant alarm 15) and a (a second flammable refrigerant alarm 16), which are connected to the communication module 24 and are used to detect whether the flammable refrigerant is leaking, and can alarm through indicator lights, APP (mobile phone application software) and host computer software.

[0045] The communication module 24 is used for communication between modules.

[0046] The mobile refrigerant automatic filling device provided by the utility model includes the following functions.

[0047] 1. Vacuuming function of mobile refrigerant automatic filling device system

[0048] like Figure 1 As shown, the system vacuum control function at least includes: a charging module 11, a first refrigerant module 12 and a second refrigerant module 13.

[0049] This function is used when the entire device needs to be vacuumed during factory production or when the entire device needs to be vacuumed in other situations. The specific operation steps are as follows:

[0050] 1) Manually close the filling module control manual valve 116, the first storage tank replenishment control manual valve 127 and the second storage tank replenishment control manual valve 137, and manually open the system vacuum control manual valve 112;

[0051] 2) Connect the vacuum pumping equipment to the system vacuum pumping control manual valve 112;

[0052] 3) Through the system vacuum button on the device or the control of the host computer, the refrigerant charging main control solenoid valve 113, the refrigerant charging coarse control solenoid valve 115, the first charging solenoid valve 125, the first storage tank replenishing solenoid valve 126, the second charging solenoid valve 135 and the second storage tank replenishing solenoid valve 136 are all opened;

[0053] 4) Turn on the vacuum equipment;

[0054] 5) After the vacuuming is completed, close the system vacuuming control manual valve 112, the refrigerant charging main control solenoid valve 113, the refrigerant charging coarse control solenoid valve 115, the first charging solenoid valve 125, the first storage tank replenishing solenoid valve 126, the second charging solenoid valve 135 and the second storage tank replenishing solenoid valve 136.

[0055] 2. Vacuuming function of charging module

[0056] like Figure 1 As shown, the vacuum control function of the refrigerant system at least includes: a charging module 11, a first charging solenoid valve 125 and a second charging solenoid valve 135.

[0057] This function is used before the device charges the air conditioner with refrigerant. Specific operation:

[0058] 1) Manually close the filling module control manual valve 116 and manually open the system vacuum control manual valve 112;

[0059] 2) Connect the vacuum pumping equipment to the system vacuum pumping control manual valve 112;

[0060] 3) By pressing the vacuum button of the charging module on the device or controlling the upper computer, the refrigerant charging main control solenoid valve 113 and the refrigerant charging coarse control solenoid valve 115 are opened, and the first charging solenoid valve 125 and the second charging solenoid valve 135 are ensured to be in a closed state;

[0061] 4) Turn on the vacuum equipment;

[0062] 5) After the vacuuming is completed, close the system vacuuming control manual valve 112, the refrigerant charging main control solenoid valve 113 and the refrigerant charging coarse control solenoid valve 115.

[0063] 3. Functions of vacuuming and replenishing refrigerant in the first refrigerant module 12

[0064] like Figure 1 As shown, the vacuum control function of the first refrigerant module 12 at least includes: the first refrigerant module 12.

[0065] This function is used to evacuate the first refrigerant module 12 and replenish the first refrigerant. Specific operation:

[0066] Vacuuming:

[0067] 1) Manually open the first storage tank replenishment control manual valve 127;

[0068] 2) Connect the vacuum pump to the first storage tank to replenish the control manual valve 127;

[0069] 3) Open the first storage tank replenishment solenoid valve 126 through the first refrigerant vacuum button on the device or the host computer control, and ensure that the first charging solenoid valve 125 is in a closed state;

[0070] 4) Turn on the vacuum equipment;

[0071] 5) After the vacuuming is completed, close the first storage tank replenishment control manual valve 127 and the first storage tank replenishment solenoid valve 126.

[0072] Refill the first refrigerant

[0073] 6) When the first storage tank 121 needs to be supplemented with refrigerant, the refrigerant is first connected to the first storage tank supplement control manual valve 127;

[0074] 7) Opening the first storage tank replenishment solenoid valve 126 to replenish refrigerant through the first refrigerant vacuum button or the host computer control;

[0075] 8) When the refrigerant replenishment is completed, the first storage tank replenishment solenoid valve 126 is closed, and the first storage tank replenishment control manual valve 127 is manually closed to complete the first refrigerant replenishment.

[0076] 4. Vacuuming and refrigerant replenishment functions of the second refrigerant module 13

[0077] like Figure 1 As shown, the vacuum control function of the second refrigerant module 13 at least includes: the second refrigerant module 13.

[0078] This function is used to evacuate the second refrigerant module 13 and replenish the second refrigerant.

[0079] Vacuuming:

[0080] 1) Manually open the second storage tank replenishment control manual valve 137;

[0081] 2) Connect the vacuum pump to the second storage tank to replenish the control manual valve 137;

[0082] 3) Open the second storage tank replenishment solenoid valve 136 through the second refrigerant vacuum button on the device or the host computer control, and ensure that the second charging solenoid valve 135 is in a closed state;

[0083] 4) Turn on the vacuum equipment;

[0084] 5) After the vacuuming is completed, close the second storage tank replenishment control manual valve 137 and the second storage tank replenishment solenoid valve 136.

[0085] Refrigerant replenishment

[0086] 6) When the second storage tank 131 needs to be supplemented with the second refrigerant, the second refrigerant is first connected to the second storage tank supplement control manual valve 137;

[0087] 7) Open the second storage tank replenishment solenoid valve 136 to replenish refrigerant through the vacuum button of the second refrigerant or the host computer control;

[0088] 8) When the refrigerant replenishment is completed, the second storage tank replenishment solenoid valve 136 is closed, and the second storage tank replenishment control manual valve 137 is manually closed to complete the second refrigerant replenishment.

[0089] 5. Automatic refrigerant filling function

[0090] like Figure 1 As shown, the automatic charging function at least includes: a charging module 11 , a first refrigerant module 12 and a second refrigerant module 13 .

[0091] This function is used to add refrigerant to the air conditioner.

[0092] First charge:

[0093] 1) After the filling module 11 is evacuated, the air conditioner is connected to the filling module control manual valve 116;

[0094] The pipelines connecting the air conditioner and the device and the air conditioner are all vacuum, and can also be connected and evacuated together with the filling module 11 (at this time, the filling module controls the manual valve 116 to be in an open state).

[0095] 2) Set the weight of the first refrigerant charge through the host computer software;

[0096] 3) The host computer compares the sum of the weight of the first refrigerant remaining in the first storage tank 121 and the second storage tank 131 with the sum of the set filling amounts to determine whether the test can be completed. If insufficient, it prompts to add refrigerant. If satisfied, it opens the refrigerant filling main control solenoid valve 113, the refrigerant filling coarse control solenoid valve 115 and the first filling solenoid valve 125 (the host computer will select the refrigerant module with a larger remaining amount according to the weight of the remaining refrigerant in the storage tank), and ensures that the second filling solenoid valve 135 is in a closed state;

[0097] 4) The host computer determines in real time whether the temperature and pressure values ​​of the refrigerant in the first storage tank 121 meet the charging requirements. If not, the first charging solenoid valve 125 is closed;

[0098] 5) Open the second charging solenoid valve 135, and the host computer determines in real time whether the temperature and pressure values ​​of the refrigerant in the second storage tank 131 meet the charging requirements. If not, close the second charging solenoid valve 135, then open the first charging solenoid valve 125, and switch back to the first refrigerant module 12;

[0099] 6) The host computer can select the refrigerant module to be charged according to the temperature and pressure value of the refrigerant until the charging amount reaches the set value;

[0100] 7) The mass flow meter 111 monitors the weight of the charged refrigerant in real time. When the charged weight reaches the set weight -10g, the refrigerant charging coarse control solenoid valve 115 is closed;

[0101] 8) When the charging weight reaches the set weight -0.6g, close the refrigerant charging main control solenoid valve 113, the first charging solenoid valve 125 or the second charging solenoid valve 135;

[0102] Added during debugging:

[0103] 9) The host computer software communicates with the air conditioning test software in real time to determine the operating status of the air conditioning;

[0104] 10) When the air conditioner is judged to be stable for a preset time, the device starts to add refrigerant to the air conditioner;

[0105] 11) The device opens the refrigerant charging main control solenoid valve 113 and the first charging solenoid valve 125 (the upper host will select the refrigerant module with a larger remaining amount according to the weight of the remaining refrigerant in the storage tank), and ensures that the second charging solenoid valve 135 is in a closed state;

[0106] 12) The host computer determines in real time whether the temperature and pressure values ​​of the refrigerant in the first storage tank 121 meet the charging requirements. If not, the first charging solenoid valve 125 is closed;

[0107] 13) Open the second charging solenoid valve 135, and the host computer determines in real time whether the temperature and pressure values ​​of the refrigerant in the second storage tank 131 meet the charging requirements. If not, close the second charging solenoid valve 135, then open the first charging solenoid valve 125, and switch back to the first refrigerant module 12;

[0108] 14) The host computer can confirm the selected refrigerant module to be charged according to the temperature and pressure values ​​of the refrigerant until the charging amount reaches the set value;

[0109] 15) The mass flow meter 111 monitors the weight of the charged refrigerant in real time. When the charged weight reaches the set weight -10g, the refrigerant charging coarse control solenoid valve 115 is closed;

[0110] 16) When the charging weight reaches the set weight -0.6g, close the refrigerant charging main control solenoid valve 113 and the first charging solenoid valve 125;

[0111] 17) The host computer software repeats steps 9)-16) according to the preset number of times of refrigerant replenishment until the last setting is completed;

[0112] 18) When the host computer software communicates with the air conditioning test software and determines that the air conditioning operation stabilization time has arrived after the last refrigerant charging, the host computer software prompts that the test is completed.

[0113] From the above description, it can be seen that the above embodiment of the utility model achieves the following technical effects: it can realize automatic filling of refrigerant into the air conditioning system, and realizes high-precision automatic filling of refrigerant, and the accuracy can reach ±1g. It can realize high-precision automatic filling of refrigerant during the air conditioner debugging process, without manual operation, reducing manual operation and improving work efficiency.

[0114] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A mobile refrigerant automatic filling device, characterized in that: It includes control switch, automatic filling cabinet, control cabinet and host computer, among which: The automatic filling cabinet is provided with a filling module, a first refrigerant module, a second refrigerant module and a safety module. The control cabinet is provided with a DC power supply, a programmable logic controller, a communication module, and a solid-state relay group. The first refrigerant module and the second refrigerant module both charge the air conditioner with refrigerant through the charging module. The safety module is connected to the first refrigerant module and the second refrigerant module to prevent excessive pressure in the first refrigerant module and the second refrigerant module. The communication module is used for communication between the charging module, the first refrigerant module, the second refrigerant module, the safety module, the programmable logic controller and the host computer. The solid-state relay group is connected to the programmable logic controller and each solenoid valve to control the on and off of the solenoid valve. The control switch is connected to the programmable logic controller and provides a control signal to the programmable logic controller. The programmable logic controller determines the on / off state of the solid-state relay group according to the state of the control switch. The DC power supply is used for supplying power.

2. The mobile refrigerant automatic charging device according to claim 1, characterized in that: The first refrigerant module includes a first storage tank, a first replenishment pipeline, a first charging pipeline, a first charging solenoid valve, a first storage tank replenishment solenoid valve, a first storage tank replenishment control manual valve and a first check valve. The first storage tank is used to store a first refrigerant. The first replenishing pipeline is used to replenish the first refrigerant into the first storage tank. The first storage tank replenishment solenoid valve is used to control the on-off of the first replenishment pipeline. The first storage tank replenishment control manual valve is arranged on the first replenishment pipeline and is located upstream of the first storage tank replenishment solenoid valve. The first refrigerant flows out from the first storage tank to the first charging pipeline, The first filling solenoid valve is used to control the on-off of the first filling pipeline. The first one-way valve is used to prevent the second refrigerant from flowing into the first refrigerant module.

3. The mobile refrigerant automatic charging device according to claim 2, characterized in that: The first refrigerant module further includes a first temperature sensor and a first pressure sensor, The first temperature sensor is used to detect the temperature of the first refrigerant in the first storage tank; The first pressure sensor is used to detect the pressure of the first refrigerant in the first storage tank.

4. The mobile refrigerant automatic charging device according to claim 2, characterized in that: The second refrigerant module includes a second storage tank, a second replenishment pipeline, a second charging pipeline, a second charging solenoid valve, a second storage tank replenishment solenoid valve, a second storage tank replenishment control manual valve and a second one-way valve. The second storage tank is used to store a second refrigerant. The second replenishing pipeline is used to replenish the second refrigerant into the second storage tank. The second storage tank replenishment solenoid valve is used to control the on-off of the second replenishment pipeline. The second storage tank replenishment control manual valve is arranged on the second replenishment pipeline and is located upstream of the second storage tank replenishment solenoid valve. The second refrigerant flows out from the second storage tank to the second charging pipeline, The second filling solenoid valve is used to control the on-off of the second filling pipeline. The second one-way valve is used to prevent the first refrigerant from flowing into the first refrigerant module.

5. The mobile automatic refrigerant filling device according to claim 4, characterized in that: The second refrigerant module further includes a second temperature sensor, a second pressure sensor and a second liquid level sensor, The second temperature sensor is used to detect the temperature of the second refrigerant in the second storage tank; The second pressure sensor is used to detect the pressure of the second refrigerant in the second storage tank.

6. The mobile refrigerant automatic charging device according to claim 4, characterized in that: The charging module includes a gas-liquid separator, a third charging pipeline, a fourth charging pipeline, a fifth charging pipeline, a mass flow meter, a refrigerant charging main control solenoid valve, a capillary tube, a branch pipe, a refrigerant charging coarse control solenoid valve and a charging module control manual valve. One end of the gas-liquid separator is connected to both the first filling pipeline and the second filling pipeline. The other end of the gas-liquid separator is connected to the first end of the third filling pipeline. The second end of the third charging pipeline is connected to the mass flow meter, and the other end of the mass flow meter is connected to the refrigerant charging main control solenoid valve. The mass flow meter is connected to the communication module, The other end of the refrigerant charging main control solenoid valve is connected to the first end of the fourth charging pipeline. The second end of the fourth filling pipeline is connected to one end of the capillary tube, The third end of the fourth filling pipeline is connected to the branch pipe, The other end of the capillary tube is connected to the first end of the fifth filling pipeline. The other end of each branch pipe is connected to the second end of the fifth filling pipeline. The refrigerant charging coarse control solenoid valve is arranged on the branch pipe. The filling module-controlled manual valve is arranged on the third end of the fifth filling pipeline.

7. The mobile refrigerant automatic charging device according to claim 6, characterized in that: The charging module also includes a vacuum pipe and a system vacuum control manual valve. The vacuum pump is connected to the third end of the third filling pipeline. The system vacuum control manual valve is arranged on the vacuum pipe.

8. The mobile refrigerant automatic charging device according to claim 1, characterized in that: The safety module includes a first pressure relief valve, a second pressure relief valve, a third storage tank and a pressure alarm. One end of the first pressure relief valve is connected to the first storage tank, and the other end is connected to the third storage tank, so as to prevent the pressure in the first storage tank from being too high. One end of the second pressure relief valve is connected to the second storage tank, and the other end is connected to the third storage tank, so as to prevent the pressure in the second storage tank from being too high. The pressure alarm is communicated with the third storage tank and is used to monitor the pressure change in the third storage tank.

9. The mobile automatic refrigerant filling device according to claim 1, characterized in that: The first refrigerant in the first refrigerant module and the second refrigerant in the second refrigerant module are different types of refrigerants, and one or both of the first refrigerant and the second refrigerant are flammable refrigerants.

10. The mobile automatic refrigerant filling device according to claim 1, characterized in that: The host computer is connected to the communication module. The programmable logic controller is connected to the communication module, and an analog quantity acquisition module is provided in the programmable logic controller. The analog quantity acquisition module is used to acquire the temperature and pressure in the first refrigerant module and the second refrigerant module. The host computer determines the state of the refrigerant in the first refrigerant module and the second refrigerant module in real time according to the data of the analog quantity acquisition module, and controls the filling of the air conditioner with refrigerant according to a preset program.

11. The mobile automatic refrigerant filling device according to claim 1, characterized in that: It also includes a flammable refrigerant alarm, which is connected to the communication module and is used to detect whether the flammable refrigerant is leaking and alarm through an indicator light, an APP and a host computer software.

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