Refrigerant charging device and charging method

Abstract

The invention discloses a refrigerant charging device and a refrigerant charging method. The refrigerant filling device comprises a filling container used for storing a refrigerant medium, and an outlet of the filling container is communicated with a heat pump system through a pipe body; the filling container is arranged on the weighing piece; the pressure measuring module is connected to the pipe body and used for measuring the internal pressure of the filling container and the internal pressure of the heat pump system; the adjusting valve group is connected to the pipe body, the adjusting valve group comprises an electromagnetic valve and an adjusting valve, and the electromagnetic valve is used for controlling connection and disconnection of the filling container and the heat pump system; and the control assembly is used for adjusting the opening degree of the adjusting valve according to the pressure in the heat pump system so that the pressure difference value between the output pressure of the adjusting valve and the pressure in the heat pump system can be larger than the pressure in the heat pump system and smaller than or equal to the steady flow pressure difference threshold value, and the weighing piece, the pressure measuring module and the adjusting valve set are all electrically connected to the control assembly. According to the invention, slow, stable and efficient filling of the refrigerant can be ensured.

Description

Technical Field

[0001] The present application belongs to the technical field of refrigeration equipment, and in particular, relates to a refrigerant charging device and a charging method. Background Art

[0002] Refrigerant charging is a key link in the heat pump system. The reliability of the refrigerant charging process will directly affect the performance and efficiency of the heat pump system.

[0003] Refrigerant is usually stored in a charging container, which is directly connected to the heat pump system unit through a high-pressure hose to inflate the heat pump system unit. At present, the refrigerant charging of heat pump system units on the market mainly adopts manual charging. During the charging process, there are problems such as failure to charge and overcharging, which leads to low charging efficiency and poor charging effect. Summary of the invention

[0004] The embodiments of the present application provide a refrigerant charging device and a charging method, which can ensure slow, stable and efficient charging of the refrigerant.

[0005] On the one hand, an embodiment of the present application provides a refrigerant charging device, comprising:

[0006] A charging container, used for storing a refrigerant medium, wherein an outlet of the charging container is connected to a heat pump system through a pipe body;

[0007] a weighing piece, on which the filling container is arranged;

[0008] A pressure measuring module, connected to the pipe body, for measuring the internal pressure of the filling container and the internal pressure of the heat pump system;

[0009] A regulating valve group connected to the pipe body, the regulating valve group comprising a solenoid valve and a regulating valve, the solenoid valve being used to control the connection and disconnection between the filling container and the heat pump system;

[0010] A control component is used to adjust the opening of the regulating valve according to the internal pressure of the heat pump system so that the pressure difference between the output pressure of the regulating valve and the internal pressure of the heat pump system is greater than the internal pressure value of the heat pump system and less than or equal to the steady-flow pressure difference threshold. The weighing piece, the pressure measuring module, and the regulating valve group are all electrically connected to the control component.

[0011] In a specific embodiment, the pressure measuring module includes a first pressure sensor and a second pressure sensor, the first pressure sensor is used to detect the internal pressure of the filling container, and the second pressure sensor is used to detect the internal pressure of the heat pump system; along the filling direction of the refrigerant medium, the first pressure sensor, the regulating valve, the solenoid valve and the second pressure sensor are arranged sequentially.

[0012] In a specific embodiment, a heating belt is further included, wherein the heating belt is arranged around the outer peripheral surface of the charging container to increase the pressure of the refrigerant medium in the charging container;

[0013] The heating belt includes a heating belt body and an elastic fastener. The heating belt body is arranged around the outer circumference of the filling container. A notch structure is formed at the end of the heating belt body. The elastic fastener is at least partially located in the notch structure and connected to the end of the notch.

[0014] In a specific embodiment, it further comprises a bearing assembly, wherein the bearing assembly comprises a bearing frame and a moving device connected to the bearing frame, and the bearing frame encloses and forms a receiving cavity for placing the filling container;

[0015] The filling container comprises a side wall and a first wall and a second wall located on both sides of the side wall along a first direction, and the outlet of the filling container is arranged on the first wall;

[0016] The support frame includes a support member and a connecting member, wherein the support member extends along the circumference of the filling container and is arranged in contact with the side wall, and the connecting member extends along the first direction and is connected to the support member and the weighing member, and the weighing member is arranged in contact with the second wall.

[0017] In a specific embodiment, the support frame further includes a fixing member connected to the connecting member and extending along a second direction, and the first direction intersects with the second direction;

[0018] The fixing member has a first end and a second end opposite to each other in the second direction, the first end is connected to the connecting member, the second end is connected to the moving device, and the control component is connected between the first end and the second end of the fixing member.

[0019] In a specific embodiment, the control component includes: a storage unit for acquiring and storing the charging weight, the pressure value in the charging container, and the pressure value in the heat pump system; a calculation unit for calculating the pressure difference based on the pressure value in the charging container and the pressure value in the heat pump system, and comparing the pressure difference with a steady-flow pressure difference threshold; and a control unit for adjusting the opening of the regulating valve based on the pressure value in the heat pump system so that the pressure difference is greater than the pressure value in the heat pump system and less than or equal to the steady-flow pressure difference threshold, and controlling the opening and closing of the solenoid valve based on the charging weight, the pressure difference and the steady-flow pressure difference threshold;

[0020] Wherein, the storage unit, the calculation unit and the control unit are electrically connected.

[0021] On the other hand, an embodiment of the present application provides a charging method, which is applied to any of the above-mentioned refrigerant charging devices, comprising the steps of:

[0022] Open the solenoid valve, and open the regulating valve to a first preset opening;

[0023] Obtaining a pressure value in a filling container from a first pressure sensor, obtaining a pressure value in a heat pump system from a second pressure sensor, and obtaining a filling weight value from a weighing piece;

[0024] Regulating the regulating valve to a second preset opening so that the pressure difference between the regulating valve output pressure and the pressure in the heat pump system is less than or equal to a steady flow pressure difference threshold and greater than the pressure value in the heat pump system;

[0025] Determining whether the charging weight value is greater than or equal to a charging upper limit threshold;

[0026] If not, continue to charge;

[0027] If so, close the solenoid valve and the regulating valve, and the filling is completed.

[0028] In a specific embodiment, if the step is no, then after continuing to fill, it also includes:

[0029] Determine whether the pressure difference between the pressure in the filling container and the pressure in the heat pump system is less than the pressure difference lower limit threshold;

[0030] If not, return to the execution step: continue charging;

[0031] If yes, turn on the heating tape.

[0032] In a specific embodiment, the step: if yes, after turning on the heating belt, further includes:

[0033] Determining whether the pressure value in the filling container remains unchanged and lasts for a preset time;

[0034] If yes, then execute the steps: close the solenoid valve, close the regulating valve, close the heating belt, replace the filling container, and restart the filling;

[0035] If not, proceed to step: Continue filling.

[0036] In a specific embodiment, the step: if no, then executing the step: after continuing to fill, further includes:

[0037] Determining whether the pressure value in the filling container is greater than or equal to an upper pressure threshold;

[0038] If yes, the steps are performed: turning off the heating belt;

[0039] If not, proceed to step: Continue filling.

[0040] The refrigerant filling device and filling method of the embodiment of the present application, by setting a solenoid valve on the tube body, and setting a regulating valve at the front end of the solenoid valve on the tube body, the solenoid valve is opened or closed to realize the on-off of the refrigerant medium inside the tube body, and the filling pressure is adjusted by controlling the opening of the regulating valve. The present application connects a pressure measuring module in the tube body, and measures the internal pressure of the tube body corresponding to the filling container in real time through the pressure measuring module, and measures the internal pressure of the tube body corresponding to the heat pump system in real time, and flexibly adjusts the opening of the regulating valve based on the pressure value of the internal pressure of the heat pump system in the tube body, so that the output pressure value of the regulating valve is always maintained within a range greater than the pressure value in the heat pump system and less than or equal to the maximum steady flow pressure value, thereby ensuring the smooth and continuous filling of refrigerants such as carbon dioxide. In addition, the present application measures the filling weight in real time through a weighing piece, and adjusts the solenoid valve based on the filling weight as the filling start and end conditions, thereby realizing the on-off control of the refrigerant medium in the tube body.

[0041] The weighing device, pressure measuring module and regulating valve group in the present application are all communicatively connected to an external control component, and the control component monitors and controls the detection data to facilitate automatic and accurate control of the filling process.

[0042] The refrigerant charging device and charging method in the present application accurately control the opening of the regulating valve based on the pressure in the heat pump system, so that the output pressure of the regulating valve is always slightly higher than the pressure in the heat pump system, which can effectively ensure the slow, stable and efficient charging of carbon dioxide, avoid the compressor liquid shock caused by excessive charging of carbon dioxide when the heat pump is turned on, and avoid the phenomena of charging failure, charging interruption and overcharging, with high charging efficiency and good charging effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0044] Figure 1 This is a schematic diagram of the structure of a refrigerant charging device in some embodiments of the present application;

[0045] Figure 2 A schematic structural diagram of a refrigerant charging device from another perspective of some embodiments of the present application;

[0046] Figure 3 It is a structural schematic diagram of a bearing assembly in a refrigerant charging device in some embodiments of the present application;

[0047] Figure 4 for Figure 3 The main view of the component in the load-bearing component;

[0048] Figure 5 for Figure 3 A side view of the middle load-bearing assembly;

[0049] Figure 6 for Figure 3 A top view of the load-bearing component;

[0050] Figure 7 A schematic diagram of the structure of a heating element in a refrigerant charging device in some embodiments of the present application;

[0051] Figure 8 It is a structural schematic diagram of the refrigerant charging device in some other embodiments of the present application in an unfolded state;

[0052] Fig. 9 for Figure 8 Side view of

[0053] Fig.10 It is a structural schematic diagram of the refrigerant charging device in some other embodiments of the present application in a folded state;

[0054] Fig.11 for Fig.10 Side view of

[0055] Fig.12 A schematic diagram of a control component in a refrigerant charging device according to some embodiments of the present application;

[0056] Fig.13 This is a flow chart of a charging method according to some embodiments of the present application.

[0057] The figures are as follows:

[0058] Filling container 10; side wall 11; first wall 12; second wall 13;

[0059] Weighing piece 20;

[0060] Pressure measuring module 30; first pressure sensor 31; second pressure sensor 32;

[0061] Regulating valve group 40; solenoid valve 41; regulating valve 42;

[0062] Control component 50; storage unit 51; calculation unit 52; control unit 53;

[0063] Heat pump system 60;

[0064] Heating belt 70; heating belt body 71; elastic fastener 72; notch structure 73; surrounding end 74;

[0065] Carrying assembly 80; carrying frame 81; moving device 82; enclosure 83; supporting member 811; connecting member 812; fixing member 813; armrest 814; accommodating chamber 815; front wheel assembly 821; rear wheel assembly 822; first connecting rod portion 8121; second connecting rod portion 8122; first support rod 8131; second support rod 8132; first connecting rod 8133; second connecting rod 8134; hinged member 8135; hinge 8136; first direction X; second direction Y. DETAILED DESCRIPTION

[0066] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0068] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0069] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0070] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0071] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0072] If not otherwise specified, all steps of the present application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially.

[0073] 15 For example, when it is mentioned that the method may further include step (c), it means that step (c) may be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0074] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0075] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0076] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0077] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0078] In recent years, with the increasing severity of global warming and ozone layer depletion, energy conservation and emission reduction have always been the focus of attention in the field of refrigeration technology. In refrigeration technology, refrigerant is used as the working medium, and energy transfer is achieved through the change of the refrigerant phase to complete the refrigeration cycle. Refrigerants mainly include chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), carbon dioxide (CO2), etc. Among them, the new refrigerant CO2 has gradually replaced CFC and HCFCs refrigerants in recent years due to its environmental protection and energy-saving advantages. As a future substitute for hydrocarbons, it has been increasingly widely used in heat pump systems60.

[0079] The researchers noticed that during the process of charging the heat pump system 60 with refrigerants such as CO2, the internal pressure of the filling container 10 will change as the refrigerant is charged. The changing air pressure usually makes it impossible to accurately control the charging process, and charging interruptions, overcharging, and liquid shock in the heat pump system 60 compressor often occur, making it impossible to guarantee the charging accuracy and efficiency.

[0080] In order to ensure the smooth progress of the filling process, the current common practice is to set a sensor to monitor the internal pressure of the filling container 10, and control the semi-automatic filling process according to the internal pressure of the filling container 10. During the filling process, filling failure and overcharging often occur, resulting in low filling efficiency and poor filling effect. Although filling interruption and overcharging are alleviated to a certain extent, the problem of liquid hammer in the compressor of the heat pump system 60 cannot be completely solved, and the filling efficiency is low.

[0081] In view of this, the present application provides a refrigerant charging device and a charging method. Figures 1 to 12 As shown, the refrigerant charging device provided in the embodiment of the present application is first introduced below.

[0082] Please refer to Figure 1 and Figure 2. The present application provides a refrigerant filling device, including a filling container 10, a weighing piece 20, a pressure measuring module 30, a regulating valve group 40 and a control component 50. The filling container 10 is used to store a refrigerant medium, and the outlet of the filling container 10 is connected to the heat pump system 60 through a pipe body. The weighing piece 20, the filling container 10 is arranged on the weighing piece 20. The pressure measuring module 30 is connected to the pipe body and is used to measure the internal pressure of the filling container 10 and the internal pressure of the heat pump system 60. The regulating valve group 40 is connected to the pipe body, and the regulating valve group 40 includes a solenoid valve 41 and a regulating valve 42, and the solenoid valve 41 is used to control the connection and disconnection of the filling container 10 and the heat pump system 60. The control component 50 is used to adjust the opening of the regulating valve 42 according to the internal pressure of the heat pump system 60, so that the pressure difference between the output pressure of the regulating valve and the internal pressure of the heat pump system is greater than the internal pressure of the heat pump system and less than or equal to the steady flow pressure difference threshold. The control component 50 , the weighing element 20 , the pressure measuring module 30 , and the regulating valve group 40 are all electrically connected to the control component 50 .

[0083] The heat pump system 60 in the embodiment of the present application can be, but is not limited to, equipment that uses refrigerants such as heat pump air conditioners, heat pump water heaters, heat pump dryers and heat pump dehumidifiers. The refrigerants in the present application are not limited to CFCs, HCFCs, CO2, and can also include other gases or liquids.

[0084] The filling container 10 is a container for storing refrigerant, and the refrigerant medium is stored inside the filling container 10. The filling container 10 is provided with an outlet, and the outlet is connected to the heat pump system 60 through a pipe body. The connected pipe body can be a high-pressure hose to ensure that it can withstand a certain filling high pressure to ensure that the pipe body has a high service life. The filling container 10 fills carbon dioxide into the unit of the heat pump system 60 through the pipe body. The filling container 10 can be, but is not limited to, a storage tank, a filling container 10, etc. The filling container 10 can be a movable container to facilitate the handling of the filling container 10 and transport the filling container 10 to the target location.

[0085] A pressure measuring module 30 is provided on the tube body of the embodiment of the present application, through which the pressure inside the filling container 10 and the pressure inside the heat pump system 60 are measured, and the measured pressure data are transmitted to the control component 50 in real time.

[0086] Optionally, the pressure measuring module 30 may include at least two pressure measuring devices, which may be but are not limited to a pressure gauge, a pressure meter and a pressure sensor. The pressure measuring device is arranged on the pipeline and can measure the internal pressure value of the filling container and the heat pump system in real time.

[0087] A regulating valve group 40 is also provided on the pipe body, and the regulating valve group 40 includes a solenoid valve 41 and a regulating valve 42, wherein the regulating valve 42 can be but is not limited to an electric regulating valve 42, a pneumatic regulating valve 42, and a self-operated pressure regulating valve 42. The opening and closing of the filling container 10 and the heat pump system 60 are controlled by the solenoid valve 41, thereby controlling the on and off of the refrigeration flow inside the pipe body.

[0088] The solenoid valve 41 and the regulating valve 42 are both communicatively connected to the control component 50. The control component can adjust the opening of the regulating valve itself according to the internal pressure of the heat pump system 60 measured by the pressure measuring module 30, and adjust the opening to a range where the pressure difference between the output pressure of the regulating valve and the pressure inside the heat pump system is less than or equal to the steady-flow pressure difference threshold and greater than the pressure value inside the heat pump system. The control component 50 controls the opening and closing of the solenoid valve 41 and the opening of the regulating valve 42 according to the pressure value measured by the pressure measuring module 30.

[0089] The internal pressure in the embodiment of the present application is a variable, which is the measured value of the internal pressure of the filling container 10 and the internal pressure of the heat pump system 60 obtained by the pressure measuring module 30. The opening value of the regulating valve 42 is determined based on the internal pressure value of the heat pump system and the preset steady flow pressure difference threshold. The steady flow pressure difference threshold is the maximum pressure value for obtaining steady flow. The control component 50 can adjust the opening of the regulating valve 42 based on the mapping relationship between the measured value of the internal pressure and the valve opening corresponding to the pre-stored pressure value or pressure gradient value, so that the pressure difference between the output pressure of the regulating valve and the internal pressure of the heat pump system is greater than the internal pressure of the heat pump system and less than or equal to the steady flow pressure difference threshold. Therefore, the opening of the regulating valve 42 can be a variable value obtained based on the measured internal pressure value and the above-mentioned mapping relationship, or it can be a preset value.

[0090] In addition, the refrigerant charging device of the embodiment of the present application further includes a weighing element 20, which has a built-in weighing sensor. The weighing element 20 can be independently provided or integrated on the movable bearing assembly 80, and in a stationary state, the online real-time weighing of the weight of the filling container 10 can be realized. The weighing sensor feeds back the filling weight to the display screen of the control assembly 50 through the weighing sensor, and the filling weight can be monitored in real time according to the change of the weight value of the filling container 10, and transmitted to the control assembly 50. The control assembly 50 controls the switch state of the solenoid valve 41 according to the measured filling weight.

[0091] Therefore, the present application integrates the functions of real-time pressure adjustment, online weighing, and automatic opening and closing of filling, and can accurately control the opening of the electric regulating valve 42 according to the pressure in the heat pump system 60, so that the output pressure of the regulating valve 42 is always slightly higher than the pressure in the heat pump system 60, and CO2 is slowly and steadily filled, so that the filling pressure is always maintained within the steady flow pressure range, to avoid filling interruption and excessive filling of CO2 in the heat pump system when it is turned on, resulting in compressor liquid shock, and can preset the target filling weight, control the opening of the solenoid valve 41, start filling, and read the filling weight in real time. When the filled weight is greater than or equal to the set filling weight, the solenoid valve 41 is closed and the filling is completed. The present application can realize automatic refrigerant filling, with high filling accuracy, high filling efficiency, and good reliability.

[0092] In a specific embodiment, the pressure measuring module 30 includes a first pressure sensor 31 and a second pressure sensor 32. The first pressure sensor 31 is used to detect the internal pressure of the filling container 10, and the second pressure sensor 32 is used to detect the internal pressure of the heat pump system 60. Along the filling direction of the refrigerant medium, the first pressure sensor 31, the regulating valve 42, the solenoid valve 41 and the second pressure sensor 32 are arranged sequentially.

[0093] The first pressure sensor 31 and the second pressure sensor 32 are both arranged on the tube body. The first pressure sensor 31 is arranged on one end of the tube body close to the outlet of the filling container 10, and the second pressure sensor 32 is arranged on one end of the tube body close to the heat pump system 60. The first pressure sensor 31 measures and obtains the internal pressure value of the filling container 10 in real time, and the second pressure sensor 32 measures and obtains the internal pressure value of the heat pump system 60 in real time.

[0094] In this embodiment, the internal pressure of the filling container 10 is measured by the first pressure sensor 31 arranged at the front end of the regulating valve 42, and then the solenoid valve 41 is connected, and finally the heat pump system 60 unit that needs to be filled with carbon dioxide is connected at the rear end of the solenoid valve 41. The components can be adjacent or distributed at a small distance. In this way, the layout distance between the components can be shortened, the interference caused by the refrigerant pressure inside the pipe body between the components can be reduced, and the detection accuracy of the pressure value can be improved.

[0095] In a specific embodiment, the refrigerant filling device further includes a heating belt 70 , which is disposed around the outer circumference of the filling container 10 to increase the pressure of the refrigerant medium in the filling container 10 .

[0096] Considering that when the filling container 10 is in a low temperature environment or has been filled for a period of time, resulting in a low filling pressure, for example, when the pressure of the filling container 10 is close to the pressure of the heat pump system 60, the pressure difference between the pressure of the filling container 10 and the heat pump system 60 is insufficient, and thus filling cannot be performed by relying on the pressure difference. Taking carbon dioxide as an example, specifically refer to Table 1, which shows the relationship between the carbon dioxide pressure and temperature when the filling container 10 is full:

[0097] Table 1. Carbon dioxide pressure and temperature relationship

[0098] Temperature(℃) -30 -20 -10 0 10 20 30 Filling pressure(Mpa) 1.43 1.97 2.65 3.49 4.5 5.73 7.21

[0099] It can be seen that the filling pressure is positively correlated with the ambient temperature, that is, the lower the temperature, the smaller the filling pressure. When the pressure difference between the filling pressure and the internal pressure is not enough for filling, the filling will be interrupted. In order to solve this problem, the present application adopts a solution of setting a heating belt 70 on the outer peripheral surface of the filling container 10. The heating belt 70 can be arranged around the entire outer peripheral surface of the filling container 10, or it can be sleeved on the outer peripheral surface of the filling container 10, and it can also be attached or fixed to the outer surface of the filling container 10 by fasteners. In addition, the heating belt 70 is not limited to a fully covered structure, but can also be a local heating structure, which can heat a local area of ​​the filling container 10. The heating belt 70 has a built-in heating element, such as a heating wire, a heating plate, etc., which is powered by an external power supply to heat the filling container 10.

[0100] The heating belt 70 is connected to the control component 50, and automatically turns on the heating mode according to the measured internal pressure value of the filling container 10. Specifically, when the pressure difference value cannot meet the filling condition, the heating belt 70 automatically turns on to increase the pressure in the filling container 10. For example, when the pressure in the heat pump system 60 is 4MPa, when the pressure in the filling container 10 is less than 4.5MPa, the electric heating belt 70 is turned on at this time. After the heating belt 70 generates heat, it heats the CO2 and increases the pressure of the CO2 in the filling container 10, so that the filling process can be maintained. When the pressure in the filling container 10 is higher than the maximum allowable pressure of the filling container 10 (generally 7MPa), the electric heating belt 70 is turned off. In this way, continuous and uninterrupted filling before the refrigerant in the heat pump system 60 is filled can be achieved, further improving the filling efficiency.

[0101] like Figure 7 As for the specific structure of the heating belt 70, in one embodiment, the heating belt 70 includes a heating belt body 71 and an elastic fastener 72, the heating belt body 71 is arranged around the outer circumference of the filling container 10, the surrounding end 74 of the heating belt body 71 forms a notch structure 73, and the elastic fastener 72 is at least partially located in the notch structure 73 and connected to the surrounding end 74.

[0102] The heating belt body 71 is made of a flexible material, and can adjust its own shape according to the appearance of the filling container 10 so as to fit the outer surface of the filling container 10. The heating belt body 71 has a built-in heating element, and a temperature control unit and a plug are arranged on the outside of the heating belt body 71. The plug is connected to an external power source, and the temperature control unit is connected to the control component 50 through communication, so as to control the temperature of the heating element so as to maintain a predetermined temperature. The elastic fastener 72 can be, but is not limited to, a spring, and is certainly not limited to elastic fastening, and can also be a fastener to achieve the fastening of the surrounding end 74. The surrounding end 74 along the circumferential direction of the heating belt body 71 forms a notch structure 73, and the elastic fastener 72 is arranged in the notch structure 73, and is elastically tied to the two surrounding ends 74, so that the heating belt body 71 maintains a close contact with the filling container 10. This heating structure can reduce the gap between the heating belt body 71 and the filling container 10, and can make adaptive adjustments according to the shape of the filling container 10, and can be adapted to various types of filling containers 10, effectively improving the scope of application.

[0103] In addition, in order to improve the heating efficiency, the present embodiment adopts the method of surrounding the heating belt 70 in the lower one-third to one-half area of ​​the filling container 10. Figure 2 shown.

[0104] In this embodiment, the lower area of ​​the filling container 10 close to the bottom is heated, and the temperature of the refrigerant increases after being heated, causing its volume to expand and its density to decrease, thereby flowing upward to the filling container 10. The refrigerant in the upper part of the filling container 10 shrinks in volume and increases in density when it is cooled, thereby sinking downward. The two flows meet and mix, making the temperature more uniform more quickly and improving the heat transfer efficiency.

[0105] In addition, the heating belt 70 can be set at any position of the filling container 10 according to actual needs. The setting position and heating method of the heating belt 70 only need to meet the heating requirements and are not limited in this article.

[0106] like Figures 3 to 6 In order to facilitate the movement of the filling container 10, a bearing assembly 80 may be further provided. The bearing assembly 80 includes a bearing frame 81 and a moving device 82 connected to the bearing frame 81. The bearing frame 81 encloses a receiving cavity 815 for placing the filling container 10.

[0107] The carrier 81 in this embodiment has the function of transporting the filling container 10. When the filling container 10 needs to be transported, the filling container 10 is placed in the accommodating cavity 815 of the carrier 81, and the carrier 81 is pushed. Under the drive of the moving device 82, the carrier 81 carries the filling container 10 to a predetermined position convenient for connection with the heat pump system 60. In addition, a weighing piece 20 can be set at the bottom of the carrier 81, or the weighing piece 20 can be integrated into the bottom of the carrier 81, so that the online weighing of the filling weight can be realized. The control component 50 is set on the carrier 81, which can shorten the wiring length and facilitate movement.

[0108] This embodiment, in combination with the above-mentioned embodiments, can realize the multifunctional integration of transportation, weighing, heating and automatic filling of the filling container 10, is easy to use, has a compact layout, and realizes miniaturization of the device.

[0109] Regarding the structure of the support frame 81, in one embodiment, the filling container 10 includes a side wall 11 and a first wall 12 and a second wall 13 located on both sides of the side wall 11 along a first direction, and the outlet of the filling container 10 is arranged at the first wall 12. The support frame 81 includes a support member 811 and a connecting member 812, the support member 811 extends along the circumference of the filling container and is arranged in contact with the side wall 11, the connecting member 812 extends along the first direction X and is connected to the support member 811 and the weighing member 20, and the weighing member 20 is arranged in contact with the second wall 12.

[0110] The side wall 11 of the filling container 10 is distributed circumferentially, the first wall 12 corresponds to the top of the side wall 11 in the figure, and the second wall 13 corresponds to the bottom of the side wall 11 in the figure. The side wall 11, the first wall 12 and the second wall 13 are arranged to form a container that is closed on all sides and at the top and bottom.

[0111] The connecting member 812 may be an integrated structure, and is provided with a handrail 814 along the first direction X. The handrail 814 is formed by extending from the top of the connecting member 812 to the rear side in the transport direction to facilitate manual pushing. The connecting member 812 and the supporting member 811 form a receiving cavity 815 to achieve the installation of the filling container 10.

[0112] The connector 812 can also be split, and the components are connected by the connector. The connector 812 can also be a folding structure. In a specific embodiment, the connector 812 includes: a first connecting rod portion 8121 and a second connecting rod portion 8122, the first connecting rod portion 8121 and the second connecting rod portion 8122 extend along the first direction X, the handrail 814 is connected to the second connecting rod portion 8122, and the connection between the first connecting rod portion 8121 and the second connecting rod portion 8122 is hinged by a hinge. The second connecting rod portion 8122 can be folded toward the first connecting rod portion 8121 at the upper part, or folded toward the first connecting rod portion 8121 at the lower part. In addition, the first connecting rod portion 8121 and the second connecting rod portion 8122 can also be plugged in through a sleeve. Thus, a folding structure is formed, which can shorten the overall length of the carrier for easy storage and transportation.

[0113] The carrier 81 further includes a fixing member 813 connected to the connecting member 812 and extending along the second direction Y, wherein the first direction X intersects the second direction Y. The fixing member 813 has a first end and a second end opposite to each other in the second direction Y, wherein the first end is connected to the connecting member 812 and the second end is connected to the mobile device, and the control assembly is connected between the first end and the second end of the fixing member 813.

[0114] like Figure 8 and Fig. 9 As shown. The fixing member 813 may include two first support rods 8131 and two second support rods 8132 fixedly connected to the rear side of the connecting member 812, the two first support rods 8131 are arranged at the lower part of the connecting member 812, and the two second support rods 8132 are arranged at the rear side of the two first support rods 8131. The fixing member 813 may also include a plurality of connecting rods and a plurality of reinforcing rods, and the connecting rod may adopt a four-link connecting rod, the four-link connecting rod is connected to the bottom of the two first support rods and the two second support rods, and the four connecting rods are connected end to end in sequence, and the reinforcing rod is connected to the two first support rods 8131 and the two second support rods 8132. The fixing member 813 may form a stable fixed support structure for the support frame at the lower part, and the moving device 82 is arranged at the bottom of the fixing member 813. In this embodiment, the control component is integrated into the support frame, which can shorten the wiring length and facilitate filling.

[0115] In addition, the first ends of the two first support rods 8131 can also be connected to the hinge rod 8136, and the first link portion 8121, the second link portion 8122 and the first support rod 8131 are connected through the hinge rod 8136. In the working state, the hinge rod 8136 forms a connection support for the first link portion 8121 and the second link portion 8122. When folding is required, the hinge rod 8136 is released or loosened, and the second link portion 8122 is folded toward the first link portion 8121. Fig.10 and Fig.11 shown.

[0116] Furthermore, the connecting rod can adopt a folding structure, and further reference is made to Figure 8 The connecting rod may include a first connecting rod 8133, a second connecting rod 8134 and a hinge 8135. In the working state, the first connecting rod 8133 and the second connecting rod 8134 are fastened together by the hinge 8135 to achieve a stable supporting structure. When not working, the hinge 8135 can be loosened or removed to fold the first connecting rod 8133 and the second connecting rod 8134 together, thereby further reducing the overall size of the carrier, which is convenient for storage and transportation.

[0117] The above-mentioned moving device 82 includes a front wheel assembly 821 and a rear wheel assembly 822, and the front wheel assembly 821 and the rear wheel assembly 822 are arranged at the bottom of the support member 811. The front wheel assembly 821, the rear wheel assembly 822 and the support member 811 constitute a movable structure, which can drive the carrier frame 81 to walk, or drive the carrier frame 81 to run through the front wheel assembly 821.

[0118] Therefore, the carrier frame 81 in this embodiment has a simple structure, a compact layout, and is easy to process and transport.

[0119] In addition, at least one enclosure 83 is provided on the front side of the carrying body. The enclosure 83 can be but is not limited to a chain or an enclosure belt, which can enclose and limit the filling container 10 at the front side of the filling container 10 to prevent the filling container 10 from moving.

[0120] In order to meet the transportation needs of multiple filling containers 10, the number of accommodating cavities 815 on the carrier 81 can be one, two, or more, so as to realize the simultaneous filling of multiple heat pump systems 60 and improve the filling efficiency.

[0121] like Fig.12 As shown. In a specific embodiment, the control component 50 includes: a storage unit 51 for acquiring and storing the charging weight, the internal pressure value of the charging container 10 and the internal pressure value of the heat pump system 60; a calculation unit 52 for calculating the pressure difference based on the internal pressure value of the charging container 10 and the internal pressure value of the heat pump system 60, and comparing the pressure difference with the steady flow pressure difference threshold; and a control unit 53 for adjusting the opening of the regulating valve 42 based on the internal pressure value of the heat pump system so that the output pressure value of the regulating valve is greater than the internal pressure value of the heat pump system and less than or equal to the steady flow pressure difference threshold, and controlling the opening and closing of the solenoid valve 41 based on the charging weight, the pressure difference and the steady flow pressure difference threshold; wherein the storage unit 51, the calculation unit 52 and the control unit 53 are electrically connected.

[0122] The filling weight measured by the weighing element 20, the internal pressure value of the filling container measured by the pressure measuring module 30, and the internal pressure value of the heat pump system 60 are transmitted to the storage unit 51, and then transmitted to the calculation unit 52 by the storage unit 51. The calculation unit 52 calculates the opening of the regulating valve and compares the pre-stored steady flow pressure difference threshold. When the filling weight is less than the preset filling weight and the pressure difference is less than the steady flow pressure difference threshold, the control unit 53 controls the electromagnetic valve 41 to remain open. When the filling weight is greater than or equal to the preset filling weight, the control unit 53 controls the electromagnetic valve 41 to close. The storage unit 51, the calculation unit 52 and the control unit 53 are connected to each other in communication.

[0123] It should be noted that the steady flow pressure value in the present application may be, but is not limited to, 0.5 MP to 1 MP, and the steady flow pressure difference threshold may be, but is not limited to, 1 MP.

[0124] like Fig.13 In addition, the present application also provides a charging method, which is applied to the above-mentioned refrigerant charging device, comprising the steps of:

[0125] S1, open the solenoid valve 41, and open the regulating valve 42 to a first preset opening;

[0126] S2, obtaining the pressure value in the filling container of the first pressure sensor 31, obtaining the pressure value in the heat pump system of the second pressure sensor 32, and obtaining the filling weight value of the weighing piece 20;

[0127] S3, adjusting the regulating valve 42 to a second preset opening, so that the pressure difference between the regulating valve output pressure and the pressure in the heat pump system is less than or equal to the steady flow pressure difference threshold and greater than the pressure value in the heat pump system;

[0128] S4, determining whether the charging weight value is greater than or equal to the charging upper limit threshold;

[0129] S5. If not, continue to charge;

[0130] S6: If yes, close the solenoid valve 41 and the regulating valve 42, and the filling is completed.

[0131] In step S1, first, the start button is pressed, the filling device is initialized and it is determined whether the filling device is normal. If it is, the filling weight, steady flow pressure difference threshold, filling upper limit threshold and other parameters are set to start filling. If not, an alarm is sounded to prompt the staff to check the abnormal situation. Then, the control component 50 controls the solenoid valve 41 to open, and opens the regulating valve 42 to the first preset opening.

[0132] In step S2, the first pressure sensor 31 measures the internal pressure value of the filling container 10, and the second pressure sensor 32 measures the internal pressure value of the heat pump system, and the filling weight value of the weighing piece 20 is obtained in real time as a judgment condition for ending the filling action.

[0133] In this step, during the filling process, the filling weight value is obtained in real time, and it is determined whether the filling weight value is greater than or equal to the filling upper limit threshold. When the filling upper limit threshold is reached, the solenoid valve 41 and the regulating valve 42 are closed, and the filling is completed. When the filling upper limit threshold is not reached, the filling is continued.

[0134] In step S3, the control component 50 obtains the internal pressure values ​​of the filling container and the heat pump system, and calculates the pressure difference between the pressure value in the filling container and the pressure value in the heat pump system, compares the pressure difference with the steady flow pressure difference threshold, and slowly adjusts the regulating valve 42 to the second preset opening according to the relationship between the pressure difference and the steady flow pressure difference threshold and the opening of the regulating valve 42. The second preset opening is the calculated output opening, and the output pressure of the regulating valve in the tube body under the second preset opening is less than or equal to the steady flow pressure difference threshold and greater than the pressure value in the heat pump system. The second preset opening is greater than the first preset opening. In addition, the internal pressure value of the filling container and the internal pressure value of the heat pump system can also be compared to determine the valve opening.

[0135] The charging method in this embodiment, after step S5: if no, continue charging, further comprises:

[0136] S7, determining whether the pressure difference is less than the pressure difference lower limit threshold;

[0137] If not, return to step S4 to determine whether the charging weight value is greater than or equal to the charging upper limit threshold;

[0138] S8: If yes, turn on the heating belt 70.

[0139] In step S7, when the pressure difference is less than the pressure difference lower limit threshold, it indicates that the filling pressure is insufficient at this time and the filling is interrupted.

[0140] In step S8 , when it is determined that the filling pressure is insufficient, the control component 50 controls the heating belt 70 to turn on to heat the filling container 10 .

[0141] In addition, in step S8: If yes, after turning on the heating belt 70, it also includes step: S9, judging whether the pressure value of the filling container remains unchanged and lasts for a preset time; if not, executing step S10: judging whether the filling pressure difference value is greater than or equal to the pressure difference upper limit threshold; if yes, executing step S11: closing the solenoid valve 41, closing the regulating valve 42, closing the heating belt 70, and the filling is completed.

[0142] In step S9, the preset time can be set according to actual needs. By judging whether the filling pressure value remains unchanged and maintained for a certain period of time, it is judged whether there is still refrigerant medium in the filling container 10, and the filling container 10 without refrigerant is replaced.

[0143] Further, after step S9: judging whether the internal pressure value of the filling container remains unchanged and continues for a preset time, it also includes the step: S10, judging whether the filling weight value is greater than or equal to the filling upper limit threshold value, if so, executing step S14, closing the solenoid valve, closing the regulating valve, closing the heating belt, and ending the filling; if not, executing step S12: judging whether the pressure value in the filling container is greater than the pressure upper limit threshold value, if so, executing step S13: closing the heating belt, if not, executing step S9: judging whether the pressure value in the filling container remains unchanged and continues for a preset time.

[0144] In summary, the refrigerant filling device and filling method provided in the present application add refrigerants such as carbon dioxide through electric control, making the filling more efficient, accurate, and convenient to use.

[0145] It should be noted that when a component is referred to as being "fixed to" or "fixed to" or "set on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right", "front", "rear" and similar expressions used in the specification of this application are only for illustrative purposes and do not represent the only implementation method. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. Finally, it should be noted that those skilled in the art will easily think of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variation, use or adaptation of the present invention, which follows the general principles of the present invention and includes common knowledge or customary technical means in the art not disclosed by the present invention, is not limited to the precise structure described above and shown in the drawings, and can be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0146] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A refrigerant charging device, characterized in that: include: A charging container, used for storing a refrigerant medium, wherein an outlet of the charging container is connected to a heat pump system through a pipe body; a weighing piece, on which the filling container is arranged; A pressure measuring module, connected to the pipe body, for measuring the internal pressure of the filling container and the internal pressure of the heat pump system; A regulating valve group connected to the pipe body, the regulating valve group comprising a solenoid valve and a regulating valve, the solenoid valve being used to control the connection and disconnection between the filling container and the heat pump system; A control component is used to adjust the opening of the regulating valve according to the internal pressure of the heat pump system so that the pressure difference between the output pressure of the regulating valve and the internal pressure of the heat pump system is greater than the internal pressure value of the heat pump system and less than or equal to the steady-flow pressure difference threshold. The weighing piece, the pressure measuring module, and the regulating valve group are all electrically connected to the control component.

2. The refrigerant charging device according to claim 1, characterized in that: The pressure measuring module includes a first pressure sensor and a second pressure sensor, the first pressure sensor is used to detect the internal pressure of the filling container, and the second pressure sensor is used to detect the internal pressure of the heat pump system; along the filling direction of the refrigerant medium, the first pressure sensor, the regulating valve, the solenoid valve and the second pressure sensor are arranged sequentially.

3. The refrigerant charging device according to claim 2, characterized in that: Also included is a heating belt, which is arranged around the outer circumference of the charging container to increase the pressure of the refrigerant medium in the charging container; The heating belt includes a heating belt body and an elastic fastener. The heating belt body is arranged around the outer circumference of the filling container. A notch structure is formed at the end of the heating belt body. The elastic fastener is at least partially located in the notch structure and connected to the end of the notch.

4. The refrigerant charging device according to any one of claims 1 to 3, characterized in that: It also includes a bearing assembly, the bearing assembly includes a bearing frame and a moving device connected to the bearing frame, the bearing frame encloses to form a receiving cavity for placing the filling container; The filling container comprises a side wall and a first wall and a second wall located on both sides of the side wall along a first direction, and the outlet of the filling container is arranged on the first wall; The support frame includes a support member and a connecting member, wherein the support member extends along the circumference of the filling container and is arranged in contact with the side wall, and the connecting member extends along the first direction and is connected to the support member and the weighing member, and the weighing member is arranged in contact with the second wall.

5. The refrigerant charging device according to claim 4, characterized in that: The carrier frame further includes a fixing member connected to the connecting member and extending along a second direction, wherein the first direction intersects with the second direction; The fixing member has a first end and a second end opposite to each other in the second direction, the first end is connected to the connecting member, the second end is connected to the moving device, and the control component is connected between the first end and the second end of the fixing member.

6. The refrigerant charging device according to claim 1, characterized in that: The control component includes: a storage unit for acquiring and storing a charging weight, a pressure value in a charging container, and a pressure value in a heat pump system; a calculation unit for calculating a pressure difference based on the pressure value in the charging container and the pressure value in the heat pump system, and comparing the pressure difference with a steady-flow pressure difference threshold; and a control unit for adjusting the opening of the regulating valve based on the pressure value in the heat pump system, so that the pressure difference between the output pressure of the regulating valve and the pressure in the heat pump system is greater than the pressure value in the heat pump system and less than or equal to the steady-flow pressure difference threshold, and controlling the opening and closing of the solenoid valve based on the charging weight, the pressure difference, and the steady-flow pressure difference threshold; Wherein, the storage unit, the calculation unit and the control unit are electrically connected.

7. A filling method, characterized in that: The refrigerant charging device according to any one of claims 1 to 6 comprises the steps of: Open the solenoid valve, and open the regulating valve to a first preset opening; Obtaining a pressure value in a filling container from a first pressure sensor, obtaining a pressure value in a heat pump system from a second pressure sensor, and obtaining a filling weight value from a weighing piece; Regulating the regulating valve to a second preset opening so that the pressure difference between the regulating valve output pressure and the pressure in the heat pump system is less than or equal to a steady flow pressure difference threshold and greater than the pressure value in the heat pump system; Determining whether the charging weight value is greater than or equal to a charging upper limit threshold; If not, continue to charge; If so, close the solenoid valve and the regulating valve, and the filling is completed.

8. The filling method according to claim 7, characterized in that: If the step is no, then after continuing to charge, it also includes: Determine whether the pressure difference between the pressure in the filling container and the pressure in the heat pump system is less than the pressure difference lower limit threshold; If not, return to the execution step: continue charging; If yes, turn on the heating tape.

9. The filling method according to claim 8, characterized in that: The step: If yes, after turning on the heating belt, it also includes: Determining whether the pressure value in the filling container remains unchanged and lasts for a preset time; If yes, then execute the steps: close the solenoid valve, close the regulating valve, close the heating belt, replace the filling container, and restart the filling; If not, proceed to step: Continue filling.

10. The filling method according to claim 9, characterized in that: If not, the step is executed: After continuing to fill, it also includes: Determining whether the pressure value in the filling container is greater than or equal to an upper pressure threshold; If yes, the steps are performed: turning off the heating belt; If not, proceed to step: Continue filling.

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