Refrigerant charging device and charging method

Abstract

The application discloses a refrigerant charging device and a charging method. The refrigerant charging device comprises a charging container for storing refrigerant medium, an outlet of the charging container is communicated with a heat pump system through a pipe body, a weighing member, the charging container is arranged on the weighing member, a pressure measuring module connected to the pipe body is used for measuring the internal pressure of the charging container and the internal pressure of the heat pump system, an adjusting valve group connected to the pipe body comprises an electromagnetic valve and an adjusting valve, the electromagnetic valve is used for controlling the on-off of the charging container and the heat pump system, and a control assembly is used for adjusting the opening degree of the adjusting valve according to the internal pressure of the heat pump system, so that the pressure difference between the output pressure of the adjusting 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 a steady flow pressure difference threshold value. The weighing member, the pressure measuring module and the adjusting valve group are electrically connected to the control assembly. The application can ensure slow, stable and efficient charging of the refrigerant.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of refrigeration equipment, and particularly relates to a refrigerant charging device and a charging method. BACKGROUND

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

[0003] The refrigerant is usually stored in a charging container, and the charging container is directly connected to the heat pump system unit through a high-pressure hose to charge the heat pump system unit. At present, the refrigerant charging of the heat pump system unit on the market mainly adopts a manual charging mode. During the charging process, the charging does not progress and overcharging occurs, thereby resulting in low charging efficiency and poor charging effect. SUMMARY

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

[0005] In one aspect, the application provides a refrigerant charging device, comprising:

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

[0007] A weighing member, and the charging container is arranged on the weighing member;

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

[0009] An adjusting valve group connected to the pipe body, and the adjusting valve group comprises an electromagnetic valve and an adjusting valve, and the electromagnetic valve is used for controlling the on-off of the charging container and the heat pump system;

[0010] A control assembly used for adjusting the opening degree of the adjusting valve according to the internal pressure of the heat pump system, so that the pressure difference between the output pressure of the adjusting 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 a steady flow pressure difference threshold value, and the weighing member, the pressure measurement module and the adjusting valve group are electrically connected to the control assembly.

[0011] In one specific embodiment, the pressure measurement module comprises a first pressure sensor and a second pressure sensor, the first pressure sensor is used for detecting the internal pressure of the charging container, and the second pressure sensor is used for detecting the internal pressure of the heat pump system; along the charging direction of the refrigerant medium, the first pressure sensor, the adjusting valve, the electromagnetic valve and the second pressure sensor are sequentially arranged.

[0012] In one embodiment, a heating band is further included, the heating band being arranged around the outer periphery of the charging container to increase the pressure of the refrigerant medium in the charging container.

[0013] The heating band includes a heating band body arranged around the outer periphery of the charging container, and an elastic fastener at least partially located in a notch structure formed at the end of the heating band body.

[0014] In one embodiment, a bearing assembly is further included, the bearing assembly including a bearing frame and a moving device connected to the bearing frame, the bearing frame being enclosed to form a receiving cavity for placing the charging container.

[0015] The charging container includes a side wall, a first wall and a second wall located on both sides of the side wall in a first direction, and an outlet of the charging container being arranged on the first wall.

[0016] The bearing frame includes a support member extending along the circumference of the charging container and arranged in contact with the side wall, and a connecting member extending along the first direction and connected to the support member and the weighing member, the weighing member being arranged in contact with the second wall.

[0017] In one embodiment, the bearing frame further includes a fixing member connected to the connecting member and extending along a second direction, the first direction intersecting the second direction.

[0018] The fixing member has opposite first and second ends in the second direction, the first end being connected to the connecting member, and the second end being connected to the moving device, and the control assembly being connected between the first and second ends of the fixing member.

[0019] In one embodiment, the control assembly includes a storage unit for obtaining 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 value based on the pressure value in the charging container and the pressure value in the heat pump system, and comparing the pressure difference value with the steady flow pressure difference threshold value; and a control unit for adjusting the opening degree of the regulating valve based on the pressure value in the heat pump system, so that the pressure difference value is greater than the pressure value in the heat pump system and less than or equal to the steady flow pressure difference threshold value, and controlling the opening and closing of the electromagnetic valve based on the charging weight, the pressure difference value and the steady flow pressure difference threshold value.

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

[0021] In another aspect, the embodiments of the present application provide a charging method, applied to the refrigerant charging device described in any of the above, comprising the steps of:

[0022] opening the electromagnetic valve and opening the regulating valve to a first preset opening degree;

[0023] obtaining the charging container internal pressure value of the first pressure sensor, obtaining the heat pump system internal pressure value of the second pressure sensor, and obtaining the charging weight value of the weighing member;

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

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

[0026] If not, continue charging;

[0027] If yes, close the electromagnetic valve and close the regulating valve, and the charging is completed.

[0028] In a specific embodiment, after the step of if not, continue charging, further comprising:

[0029] determining whether the pressure difference between the charging container internal pressure and the heat pump system internal pressure is less than a pressure difference lower limit threshold value;

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

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

[0032] In a specific embodiment, after the step of if yes, turn on the heating belt, further comprising:

[0033] determining whether the charging container internal pressure value remains unchanged for a preset time;

[0034] If yes, execute the step of closing the electromagnetic valve, closing the regulating valve, closing the heating belt, replacing the charging container, and starting charging again;

[0035] If not, execute the step of continue charging.

[0036] In a specific embodiment, after the step of if not, execute the step of continue charging, further comprising:

[0037] determining whether the charging container internal pressure value is greater than or equal to a pressure upper limit threshold value;

[0038] If yes, execute the step of closing the heating belt;

[0039] If not, execute the step of continue charging.

[0040] The refrigerant charging device and method of this application embodiment utilize a solenoid valve installed on the pipe body, with a regulating valve installed at the front end of the solenoid valve. Opening or closing the solenoid valve controls the flow of the refrigerant medium inside the pipe body, and controlling the opening degree of the regulating valve regulates the charging pressure. This application connects a pressure measuring module inside the pipe body to measure the internal pressure corresponding to the charging container and the internal pressure corresponding to the heat pump system in real time. Based on the pressure value corresponding to the heat pump system, the opening degree of the regulating valve is flexibly adjusted to ensure that the output pressure value of the regulating valve is always maintained within a range greater than the internal pressure of the heat pump system and less than or equal to the maximum steady-flow pressure, thereby ensuring stable and continuous charging of refrigerants such as carbon dioxide. Furthermore, this application uses a weighing device to measure the charging weight in real time and adjusts the solenoid valve based on the charging weight as the start and end conditions for charging, thereby controlling the flow of the refrigerant medium inside the pipe body.

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

[0042] The refrigerant charging device and method in this application precisely control the opening of the regulating valve based on the pressure within the heat pump system, ensuring that the output pressure of the regulating valve is always slightly higher than the pressure within the heat pump system. This effectively guarantees slow, stable, and efficient carbon dioxide charging, avoiding excessive carbon dioxide charging during heat pump startup that could lead to compressor liquid slugging. It also avoids charging failure, charging interruption, and overcharging, resulting in high charging efficiency and good charging effect. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the refrigerant charging device according to some embodiments of this application;

[0045] Figure 2 This is a schematic diagram of the refrigerant charging device from another perspective, representing some embodiments of this application.

[0046] Figure 3 This is a schematic diagram of the structure of the carrier component in the refrigerant charging device according to some embodiments of this application;

[0047] Figure 4 for Figure 3 The main view of the component in the middle;

[0048] Figure 5 for Figure 3 side view of the carrying assembly in the middle;

[0049] Figure 6 for Figure 3 top view of the carrying assembly in the middle;

[0050] Figure 7 for the structure of the heating element in the refrigerant charging device of some embodiments of the present application;

[0051] Figure 8 for the structure of the refrigerant charging device in the unfolded state of some embodiments of the present application;

[0052] Figure 9 for Figure 8 side view of the carrying assembly in the middle;

[0053] Figure 10 for the structure of the refrigerant charging device in the folded state of some embodiments of the present application;

[0054] Figure 11 for Figure 10 side view of the carrying assembly in the middle;

[0055] Figure 12 for the structure of the control assembly in the refrigerant charging device of some embodiments of the present application;

[0056] Figure 13 for the flow chart of the charging method of some embodiments of the present application.

[0057] The reference signs are as follows:

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

[0059] weighting element 20;

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

[0061] adjusting valve group 40; electromagnetic valve 41; adjusting valve 42;

[0062] control assembly 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] Bearing assembly 80; bearing frame 81; moving device 82; enclosing member 83; support member 811; connecting member 812; fixing member 813; handrail 814; containing cavity 815; front wheel assembly 821; rear wheel assembly 822; first connecting rod part 8121; second connecting rod part 8122; first support rod 8131; second support rod 8132; first connecting rod 8133; second connecting rod 8134; hinge member 8135; hinge rod 8136; first direction X; second direction Y. DETAILED DESCRIPTION

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

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising" and "having," and any variations thereof, as used in the specification and claims herein, are intended to cover both the inclusive and exclusive aspects of the terms.

[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 "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

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

[0070] If not specifically stated, all embodiments and optional embodiments of the present application can be combined to form new technical solutions.

[0071] If not specifically stated, all technical features and optional technical features of the present application can be combined to form new technical solutions.

[0072] If there is no special indication, all the steps of the present application can be carried out in sequence or randomly, preferably in sequence. For example, the method comprises steps (a) and (b), which means that the method can comprise steps (a) and (b) in sequence, or steps (b) and (a) in sequence.

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

[0074] In the description of the embodiments of the present application, the term "and / or" is only used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there can be three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0075] In the description of the embodiments of the present application, the term "a plurality of" means two or more (including two), and similarly, "a plurality of groups" means two or more groups (including two groups), and "a plurality of pieces" means two or more pieces (including two pieces).

[0076] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and 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 devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot 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 specifically indicated and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning 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 increasingly serious global warming and ozone layer destruction, energy saving and emission reduction has been the focus of the refrigeration technology field. In the refrigeration technology, the refrigerant is used as the working medium, and the energy transfer is realized through the phase change of the refrigerant to complete the refrigeration cycle. The refrigerants mainly include chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), carbon dioxide (CO2), etc. Among them, the new refrigerant CO2 gradually replaces the CFC and HCFC refrigerants in recent years due to its environmental and energy-saving advantages, and is used as a substitute for hydrocarbons in the future and is more and more widely used in heat pump systems 60.

[0079] The researchers noticed that during the process of filling the heat pump system 60 with refrigerants such as CO2, the internal pressure of the filling container 10 will change as the refrigerant filling progresses. The changing air pressure often cannot accurately control the filling process, often resulting in filling interruption, overfilling, heat pump system 60 compressor liquid knock, and the like, and cannot guarantee the filling accuracy and filling efficiency.

[0080] In order to ensure the smooth progress of the filling process, the common method at present is to monitor the internal pressure of the filling container 10 by setting a sensor, and to control the semi-automatic filling process according to the internal pressure of the filling container 10. The filling process often appears filling failure and overfilling, resulting in low filling efficiency and poor filling effect. Although it alleviates the filling interruption and overfilling to some extent, it still cannot completely solve the problem of heat pump system 60 compressor liquid knock, and the filling efficiency is low.

[0081] Therefore, the embodiments of the present application provide a refrigerant filling device and a filling method. As shown in Figures 1 to 12 The refrigerant filling device provided by the embodiments of the present application will be introduced first.

[0082] Please refer to Figure 1 and Figure 2The application provides a refrigerant charging device, which comprises a charging container 10, a weighing element 20, a pressure measuring module 30, an adjusting valve group 40 and a control assembly 50. The charging container 10 is used for storing refrigerant medium, and the outlet of the charging container 10 is connected to a heat pump system 60 through a pipe body. The charging container 10 is arranged on the weighing element 20. The pressure measuring module 30 is connected to the pipe body and is used for measuring the internal pressure of the charging container 10 and the internal pressure of the heat pump system 60. The adjusting valve group 40 is connected to the pipe body and comprises an electromagnetic valve 41 and an adjusting valve 42, wherein the electromagnetic valve 41 is used for controlling the opening and closing of the charging container 10 and the heat pump system 60. The control assembly 50 is used for adjusting the opening degree of the adjusting valve 42 according to the internal pressure of the heat pump system 60, so that the pressure difference between the adjusting valve output pressure and the internal pressure of the heat pump system is greater than the internal pressure of the heat pump system and is less than or equal to a steady flow pressure difference threshold. The control assembly 50, the weighing element 20, the pressure measuring module 30 and the adjusting valve group 40 are electrically connected to the control assembly 50.

[0083] The heat pump system 60 in the embodiment of the application can be but is not limited to a heat pump air conditioner, a heat pump water heater, a heat pump dryer and a heat pump dehumidifier and other devices using refrigerant, and the refrigerant in the application is not limited to CFCs, HCFCs and CO2, and can also include other gases or liquids.

[0084] The charging container 10 is a container for storing refrigerant, which stores refrigerant medium in the inside, and the refrigerant medium is pre-filled in the charging container 10. The charging container 10 is provided with an outlet, and the outlet is connected to the heat pump system 60 through a pipe body. The pipe body can be a high-pressure hose to ensure that it can withstand a certain charging pressure and ensure a long service life of the pipe body. The charging container 10 fills carbon dioxide into the unit of the heat pump system 60 through the pipe body. The charging container 10 can be but is not limited to a storage tank, a charging container 10 and the like. The charging container 10 can be a movable container to facilitate the transportation of the charging container 10 to the target position.

[0085] The pipe body of the embodiment of the application is provided with the pressure measuring module 30, which measures the internal pressure of the charging container 10 and the internal pressure of the heat pump system 60 and transmits the measured pressure data to the control assembly 50 in real time.

[0086] Optionally, the pressure measuring module 30 can comprise at least two pressure measuring devices, which can be but are not limited to pressure gauges, pressure meters and pressure sensors. The pressure measuring devices are arranged on the pipeline and can measure the internal pressure values of the charging container and the heat pump system in real time.

[0087] The pipe body is further provided with an adjusting valve group 40, which comprises an electromagnetic valve 41 and an adjusting valve 42. The adjusting valve 42 can be, but is not limited to, an electric adjusting valve 42, a pneumatic adjusting valve 42 or a self-acting pressure adjusting valve 42. The opening and closing of the charging container 10 and the heat pump system 60 are controlled by the electromagnetic valve 41, so as to control the on-off of the refrigerant flow in the pipe body.

[0088] The electromagnetic valve 41 and the adjusting valve 42 are both communicatively connected to a control assembly 50. The control assembly can adjust the opening degree of the adjusting valve according to the internal pressure of the heat pump system 60 measured by the pressure measurement module 30, and adjust the opening degree to a range in which the pressure difference between the output pressure of the adjusting valve and the internal pressure of the heat pump system is less than or equal to a stable flow pressure difference threshold and greater than the internal pressure of the heat pump system. The opening and closing of the electromagnetic valve 41 and the opening degree of the adjusting valve 42 are controlled by the control assembly 50 according to the pressure value measured by the pressure measurement module 30.

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

[0090] In addition, the refrigerant charging device of the embodiment of the present application further comprises a weighing member 20, which is provided with a weighing sensor. The weighing member 20 can be independently provided or integrated on the movable bearing assembly 80. In the static state, the weighing member 20 realizes online real-time weighing of the weight of the charging container 10. The weighing sensor feeds back the charging weight to the display screen of the control assembly 50. The weight of the charging container 10 can be monitored in real time according to the change of the weight value, and transmitted to the control assembly 50. The control assembly 50 controls the opening and closing state of the electromagnetic valve 41 according to the measured charging weight.

[0091] Therefore, the application integrates the functions of real-time pressure regulation, online weighing and automatic opening and closing of the charging in one, can accurately control the opening degree of the electric regulating valve 42 according to the pressure in the heat pump system 60, always make the output pressure of the regulating valve 42 slightly higher than the pressure in the heat pump system 60, slowly and stably charge CO2, always maintain the charging pressure in the steady flow pressure range, avoid the interruption of charging and the liquid strike of the compressor caused by the overcharging of CO2 when the heat pump system is in the starting state, and can preset the target charging weight, control the opening of the electromagnetic valve 41 to start charging, and read the charging weight in real time. When the charged weight is greater than or equal to the set charging weight, the electromagnetic valve 41 is closed, and the charging is completed. The application can realize automatic charging of refrigerant, has high charging accuracy, high charging efficiency and good reliability.

[0092] In a specific embodiment, the pressure measurement 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 charging container 10, and the second pressure sensor 32 is used to detect the internal pressure of the heat pump system 60; along the charging direction of the refrigerant medium, the first pressure sensor 31, the regulating valve 42, the electromagnetic valve 41 and the second pressure sensor 32 are sequentially arranged.

[0093] The first pressure sensor 31 and the second pressure sensor 32 are both arranged on the pipe body, the first pressure sensor 31 is arranged on the pipe body close to one end of the outlet of the charging container 10, and the second pressure sensor 32 is arranged on the pipe body close to one end of the heat pump system 60. The first pressure sensor 31 measures and obtains the internal pressure value of the charging 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 the embodiment, the first pressure sensor 31 arranged at the front end of the regulating valve 42 measures the internal pressure of the charging container 10, then connects the electromagnetic valve 41, and finally connects the heat pump system 60 unit which needs to be filled with carbon dioxide at the rear end of the electromagnetic valve 41. The components can be adjacent or distributed with small spacing. In this way, the layout distance between the components can be shortened, the interference between the components caused by the internal refrigerant pressure of the pipe body can be reduced, and the detection accuracy of the pressure value can be improved.

[0095] In a specific embodiment, the refrigerant charging device further includes a heating belt 70 surrounding the outer circumferential surface of the charging container 10 to increase the pressure of the refrigerant medium in the charging container 10.

[0096] Considering that when the filling container 10 is in a low-temperature environment or the filling pressure is low due to a period of filling, 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 filling container 10 and the heat pump system 60 is insufficient, and therefore filling cannot be carried out based on the pressure difference. Taking carbon dioxide as an example, please refer to Table 1. Table 1 shows the relationship between carbon dioxide pressure and temperature when the filling container 10 is full:

[0097] Table 1. Relationship between carbon dioxide pressure and temperature

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

[0099] Therefore, it is evident that the filling pressure is positively correlated with the ambient temperature; that is, the lower the temperature, the lower the filling pressure. When the pressure difference between the filling pressure and the internal pressure is insufficient for filling, the filling process will be interrupted. To address this issue, this application example employs a heating band 70 on the outer circumferential surface of the filling container 10. The heating band 70 can surround the entire outer circumferential surface of the filling container 10, or it can be fitted onto the outer circumferential surface of the filling container 10, or it can be attached to or fixed to the outer surface of the filling container 10 with fasteners. Furthermore, the heating band 70 is not limited to a fully enclosed structure; it can also be a localized heating structure, capable of heating a specific area of ​​the filling container 10. The heating band 70 incorporates heating elements, such as heating wires or heating plates, and is powered by an external power source to heat the filling container 10.

[0100] The heating element 70 is connected to the control component 50 and automatically activates the heating mode based on the measured internal pressure value of the charging container 10. Specifically, when the pressure difference does not meet the charging conditions, the heating element 70 automatically opens to increase the pressure inside the charging container 10. For example, when the internal pressure of the heat pump system 60 is 4 MPa, and the internal pressure of the charging container 10 is less than 4.5 MPa, the electric heating element 70 is activated. After the heating element 70 heats up, it heats the CO2, increasing the pressure of the CO2 inside the charging container 10, thus maintaining the charging process. When the internal pressure of the charging container 10 exceeds the maximum allowable pressure of the charging container 10 (generally 7 MPa), the electric heating element 70 is deactivated. This enables continuous and uninterrupted charging of the heat pump system 60 before the refrigerant is fully charged, further improving the charging efficiency.

[0101] like Figure 7 As shown. Regarding the specific structure of the heating band 70, in one embodiment the heating band 70 includes a heating band body 71 and an elastic fastener 72. The heating band body 71 surrounds the outer peripheral surface of the filling container 10. The surrounding end 74 of the heating band body 71 forms a notch structure 73. The elastic fastener 72 is at least partially located within the notch structure 73 and connected to the surrounding end 74.

[0102] The heating band body 71 is made of flexible material and can adapt its shape to the shape of the filling container 10 to fit the outer surface of the filling container 10. The heating band body 71 has a built-in heating element, and a temperature control device and plug are provided on the outside of the heating band body 71. The plug connects to an external power source, and the temperature control device communicates with the control component 50 to control the temperature of the heating element and maintain it at a predetermined temperature. The elastic fastener 72 can be, but is not limited to, a spring, and is not limited to elastic fasteners; it can also be any fastener to secure the surrounding ends 74. A notch structure 73 is formed along the circumferential surrounding ends 74 of the heating band body 71. The elastic fastener 72 is located within the notch structure 73 and elastically connects to the two surrounding ends 74 to keep the heating band body 71 in close contact with the filling container 10. This heating structure reduces the gap between the heating band body 71 and the filling container 10 and can be adaptively adjusted according to the shape of the filling container 10, making it suitable for various types of filling containers 10 and effectively improving its applicability.

[0103] Furthermore, to improve heating efficiency, this embodiment employs a heating band 70 surrounding the lower one-third to one-half of the filling container 10. For example... Figure 2 As shown.

[0104] In this embodiment, by heating the lower region near the bottom of the filling container 10, the refrigerant's temperature rises after being heated, causing its volume to expand and its density to decrease, thus flowing upwards in the filling container 10. The refrigerant in the upper part of the filling container 10 cools down, its volume shrinks, and its density increases, thus sinking downwards. The two flow and mix together, making the temperature more uniform more quickly and the heat transfer efficiency higher.

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

[0106] like Figures 3 to 6 As shown. To facilitate the movement of the filling container 10, a support assembly 80 can be further provided. The support assembly 80 includes a support frame 81 and a moving device 82 connected to the support frame 81. The support frame 81 encloses and forms a receiving cavity 815 for placing the filling container 10.

[0107] The carrier 81 in the 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, the carrier 81 is pushed, and the filling container 10 is carried by the carrier 81 to a predetermined position for being connected with the heat pump system 60 under the driving of the moving device 82. In addition, the bottom of the carrier 81 can be provided with the weighing member 20, or the weighing member 20 is integrated into the bottom of the carrier 81, so that the online weighing of the filling weight can be realized. The control assembly 50 is arranged on the carrier 81, so that the wiring length can be shortened, and the movement is facilitated.

[0108] The 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 convenient to use, has compact layout, and realizes the miniaturization of the device.

[0109] Regarding the structure of the carrier 81, in an embodiment, the filling container 10 includes a side wall 11 and first and second walls 12 and 13 located on both sides of the side wall 11 in a first direction, and the outlet of the filling container 10 is arranged on the first wall 12. The carrier 81 includes a support 811 and a connecting member 812, the support 811 extends along the circumference of the filling container and is arranged in contact with the side wall 11, and the connecting member 812 extends along the first direction X and is connected to the support 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 circumferentially distributed, the first wall 12 corresponds to the top of the side wall 11 in the figure, the second wall 13 corresponds to the bottom of the side wall 11 in the figure, and the side wall 11, the first wall 12 and the second wall 13 form a container with closed top and bottom.

[0111] The connecting member 812 can adopt an integrated structure, which is provided with a handrail 814 along the first direction X, the handrail 814 extends from the top of the connecting member 812 to the rear side of the transportation direction to facilitate manual pushing. The connecting member 812 and the support 811 form an accommodating cavity 815 to realize the installation of the filling container 10.

[0112] The connecting member 812 can also be in a split type, and the components are connected by the connecting member. The connecting member 812 can also be in a folding structure. In one embodiment, the connecting member 812 includes a first connecting rod part 8121 and a second connecting rod part 8122. The first connecting rod part 8121 and the second connecting rod part 8122 extend along the first direction X. The handrail 814 is connected to the second connecting rod part 8122. The first connecting rod part 8121 and the second connecting rod part 8122 are hingedly connected at the connecting position. The second connecting rod part 8122 can be folded towards the first connecting rod part 8121 at the upper portion or at the lower portion. In addition, the first connecting rod part 8121 and the second connecting rod part 8122 can be insertedly connected by a sleeve. Thus, the folding structure can shorten the overall length of the support frame, facilitating storage and transportation.

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

[0114] As shown in Figure 8 and Figure 9 The fixing member 813 can 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 portion 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 can further include a plurality of connecting rods and a plurality of reinforcing rods. The connecting rods can be four connecting rods. The four connecting rods are connected to the bottom of the two first support rods and the two second support rods, and the four connecting rods are sequentially connected end to end. The reinforcing rods are connected to the two first support rods 8131 and the two second support rods 8132. The fixing member 813 can form a stable fixed support structure for the support frame at the lower portion. The mobile device 82 is arranged at the bottom of the fixing member 813. In this embodiment, the control assembly is integrated into the support frame, which can shorten the wiring length and facilitate charging.

[0115] In addition, the first ends of the two first support rods 8131 can be connected to a hinge rod 8136. The hinge rod 8136 connects the first connecting rod part 8121, the second connecting rod part 8122, and the first support rod 8131. In the working state, the hinge rod 8136 forms a connecting support for the first connecting rod part 8121 and the second connecting rod part 8122. When folding is needed, the hinge rod 8136 is released or loosened, and the second connecting rod part 8122 is folded towards the first connecting rod part 8121. Figure 10 Figure 11 ​​

[0116] Further, the connecting rod can adopt a folding structure, with reference to Figure 8 , the connecting rod can 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 tightly connected through the hinge 8135 to realize a stable support structure. When not working, the hinge 8135 can be loosened or removed, so that the first connecting rod 8133 and the second connecting rod 8134 are folded with each other, thereby further reducing the overall size of the carrier frame, facilitating storage and transportation.

[0117] The above-mentioned mobile device 82 includes a front wheel assembly 821 and a rear wheel assembly 822, which are arranged at the bottom of the support 811. The front wheel assembly 821, the rear wheel assembly 822 and the support 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 the embodiment has simple structure, compact layout, convenient processing and convenient transportation.

[0119] In addition, the front side of the carrying body is provided with at least one enclosing member 83, which can be but is not limited to a chain or an enclosing 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 of multiple filling containers 10, the accommodating cavity 815 on the carrier frame 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] As shown in Figure 12 In one specific embodiment, the control assembly 50 includes a storage unit 51 for obtaining and storing the filling weight, the internal pressure value of the filling container 10 and the internal pressure value of the heat pump system 60; a calculation unit 52 for calculating the pressure difference value based on the internal pressure value of the filling container 10 and the internal pressure value of the heat pump system 60, and comparing the pressure difference value with the steady flow pressure difference threshold value; and a control unit 53 for adjusting the opening degree of the regulating valve 42 based on the internal pressure value of the heat pump system, so that the regulating valve output pressure value is greater than the internal pressure value of the heat pump system and less than or equal to the steady flow pressure difference threshold value, and controlling the opening and closing of the electromagnetic valve 41 based on the filling weight, the pressure difference value and the steady flow pressure difference threshold value; wherein the storage unit 51, the calculation unit 52 and the control unit 53 are electrically connected.

[0122] The obtained charging weight measured by the weighing member 20, the internal pressure value of the charging 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, and the calculation unit 52 calculates the opening degree of the adjusting valve and compares the pre-stored steady flow pressure difference threshold value, when the charging weight is less than the pre-set charging weight, and the pressure difference value is less than the steady flow pressure difference threshold value, the control unit 53 controls the electromagnetic valve 41 to keep open. When the charging weight is greater than or equal to the pre-set charging weight, the control unit 53 controls the electromagnetic valve 41 to be closed. The storage unit 51, the calculation unit 52 and the control unit 53 are in communication connection with each other.

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

[0124] As shown in Figure 13 In addition, the present application also provides a charging method applied to the above-mentioned refrigerant charging device, comprising the steps of:

[0125] S1, opening the electromagnetic valve 41, and opening the adjusting valve 42 to the first pre-set opening degree;

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

[0127] S3, adjusting the adjusting valve 42 to the second pre-set opening degree, so that the pressure difference value between the adjusting valve output pressure and the internal pressure of the heat pump system is less than or equal to the steady flow pressure difference threshold value and greater than the internal pressure value of the heat pump system;

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

[0129] S5, if not, continue to charge;

[0130] S6, if yes, close the electromagnetic valve 41 and close the adjusting valve 42, and the charging is finished.

[0131] In step S1, first, press the start button, initialize the charging device and judge whether the charging device is normal, if yes, set the charging weight, the steady flow pressure difference threshold value, the upper limit threshold value of charging and other parameters, and start charging. If not, sound an alarm to prompt the staff to troubleshoot the abnormality. Then, the control assembly 50 controls the electromagnetic valve 41 to be opened, and the adjusting valve 42 is opened to the first pre-set opening degree.

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

[0133] In this step, during the charging process, the charging weight value is obtained in real time, and it is judged whether the charging weight value is greater than or equal to the upper limit threshold of the charging. When the upper limit threshold of the charging is reached, the electromagnetic valve 41 and the regulating valve 42 are closed, and the charging is ended. When the upper limit threshold of the charging is not reached, the charging continues.

[0134] In step S3, the control assembly 50 obtains the internal pressure values of the charging container and the heat pump system, calculates the pressure difference value between the internal pressure values of the charging container and the heat pump system, compares the pressure difference value with the steady flow pressure difference threshold, and slowly adjusts the regulating valve 42 to the second preset opening degree according to the mapping relationship between the size of the pressure difference value and the steady flow pressure difference threshold and the opening degree of the regulating valve 42. The second preset opening degree is the calculated output opening degree, and the regulating valve output pressure in the pipe body at the second preset opening degree is in the range of being less than or equal to the steady flow pressure difference threshold and greater than the internal pressure value of the heat pump system. The second preset opening degree is greater than the first preset opening degree. In addition, the internal pressure value of the charging container and the internal pressure value of the heat pump system can also be compared to judge the valve opening degree.

[0135] The charging method in the embodiment further includes the following steps after step S5: if not, continue charging.

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

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

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

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

[0140] In step S8, when it is judged that the charging pressure is insufficient, the control assembly 50 controls the heating belt 70 to be turned on to heat the charging container 10.

[0141] In addition, after step S8: if yes, turn on the heating belt 70, it further includes the following steps: S9, judge whether the pressure value of the charging container remains unchanged and lasts for a preset time; if not, execute step S10: judge whether the charging pressure difference value is greater than or equal to the upper limit threshold of the pressure difference; if yes, execute step S11: close the electromagnetic valve 41, close the regulating valve 42, and close the heating belt 70, and the charging is ended.

[0142] In step S9, the preset time can be set according to actual needs, and whether the charging container 10 still has refrigerant medium is judged by judging whether the charging pressure value is unchanged and maintained for a certain time, and the charging container 10 without refrigerant is replaced.

[0143] Further, after step S9: judging whether the internal pressure value of the charging container remains unchanged and lasts for a preset time, it further includes step S10: judging whether the charging weight value is greater than or equal to the upper limit threshold of charging, if yes, executing step S14: closing the electromagnetic valve, closing the regulating valve, closing the heating belt, and ending the charging; if no, executing step S12: judging whether the internal pressure value of the charging container is greater than the upper limit threshold of pressure, if yes, executing step S13: closing the heating belt, if no, executing step S9: judging whether the internal pressure value of the charging container remains unchanged and lasts for a preset time.

[0144] In summary, the refrigerant charging device and the charging method provided by the application can charge carbon dioxide and other refrigerants in an electrically controlled manner, so that the charging is more efficient, accurate and convenient to use.

[0145] It should be noted that when a component is referred to as being "fixedly attached" or "fixed" or "set" to another component, it can be directly on the other component or there can be intervening components. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be intervening components. The terms "vertical", "horizontal", "up", "down", "left", "right", "front", "back", and similar terms as used in this description are merely for purposes of illustration and are not intended to be limiting. The terms "first", "second", and the like, as used in this description, are not used to denote or imply relative importance or a quantity of features so indicated. Thus, a feature described as a "first" feature can imply or be understood to mean at least one such feature. The term "plurality" as used in this description means at least two, for example, two, three, etc., unless otherwise specifically indicated. Finally, it should be noted that the terms "comprise", "comprising", "comprises", "including", "include", "includes" and / or the like are used herein in their open-ended, conventional sense, that is, they are used to mean including but not limited to, and allow for the possibility that other components, features, elements, steps, etc. can be added and still be within the scope of the present application. The present application is intended to cover any and all such variations, uses or adaptations of the application and includes what is described in the specification and equivalents thereof. The scope of the present application is not intended to be limited to the specific embodiments disclosed in the specification and shown in the drawings, but rather it is intended to cover all embodiments falling within the scope of the present application. The scope of the present application is limited only by the claims that follow.

[0146] It should be understood that many of the materials and devices exemplified in this disclosure are articles of manufacture (i.e., articles of manufacture) according to this disclosure. The articles of manufacture can be manufactured as such or can be manufactured by combining the materials and devices exemplified in this disclosure. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. It should be understood that, in some embodiments, equivalents to the specific electrode structures and / or methods described herein can be employed without departing from the scope of the application. Accordingly, the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including," "comprising," "having," "containing," "involving," "characterized by," "characterized into," and variations thereof herein, is meant to encompass the items listed thereafter, and equivalents thereof as well as additional items. Although the foregoing application has been described in some detail by way of illustration and example, it is not to be limited thereby, but rather, only by the scope of the appended claims.

Claims

1. A refrigerant charging device characterized by comprising: The application relates to a refrigerant charging device, comprising: a charging container for storing refrigerant medium, an outlet of the charging container being connected to a heat pump system through a pipe body; a weighing element, the charging container being arranged on the weighing element; a pressure measuring module connected to the pipe body, for measuring the internal pressure of the charging 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 for controlling the on-off connection between the charging container and the heat pump system; a control assembly for adjusting the opening degree of the regulating valve according to the internal pressure of the heat pump system, so that the pressure difference between the regulating valve output pressure 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 a steady flow pressure difference threshold value, the weighing element, the pressure measuring module and the regulating valve group being electrically connected to the control assembly.

2. The refrigerant charging apparatus according to claim 1, characterized by The pressure measuring module comprises a first pressure sensor and a second pressure sensor, the first pressure sensor being used for detecting the internal pressure of the charging container, and the second pressure sensor being used for detecting the internal pressure of the heat pump system; along the charging direction of the refrigerant medium, the first pressure sensor, the regulating valve, the solenoid valve and the second pressure sensor are sequentially arranged.

3. The refrigerant charging apparatus according to claim 2, characterized by The application further comprises a heating belt, the heating belt being arranged around the outer circumferential surface of the charging container, so as to increase the pressure of the refrigerant medium in the charging container; The heating belt comprises a heating belt body and an elastic fastener, the heating belt body being arranged around the outer circumferential surface of the charging container, the arrangement end of the heating belt body being formed into a notch structure, and the elastic fastener being at least partially located in the notch structure and connected to the arrangement end.

4. The refrigerant charging apparatus according to any one of claims 1 to 3, characterized by The application further comprises a bearing assembly, the bearing assembly comprising a bearing frame and a moving device connected to the bearing frame, the bearing frame being enclosed to form a containing cavity for placing the charging container; The charging 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 charging container is arranged on the first wall; The bearing frame comprises a support and a connecting element, the support extending along the circumferential direction of the charging container and being arranged in contact with the side wall, and the connecting element extending along the first direction and being connected to the support and the weighing element, the weighing element being arranged in contact with the second wall.

5. The refrigerant charging apparatus according to claim 4, characterized by The bearing frame further comprises a fixing element connected to the connecting element and extending along a second direction, the first direction intersecting the second direction; The fixing element has opposite first and second ends in the second direction, the first end being connected to the connecting element, and the second end being connected to the moving device, and the control assembly being connected between the first and second ends of the fixing element.

6. The refrigerant charging apparatus according to claim 1, characterized by The control assembly comprises a storage unit for obtaining 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 value based on the pressure value in the charging container and the pressure value in the heat pump system, and comparing the pressure difference value with the steady flow pressure difference threshold; and a control unit for adjusting the opening degree of the regulating valve based on the pressure value in the heat pump system, so that the pressure difference value between the regulating valve output pressure 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 electromagnetic valve based on the charging weight, the pressure difference value and the steady flow pressure difference threshold. The storage unit, the calculation unit and the control unit are electrically connected.

7. A method of charging, characterized by, The application is applied to the refrigerant charging device according to any one of claims 1 to 6, comprising the steps of: opening the electromagnetic valve and opening the regulating valve to a first preset opening degree; obtaining the pressure value in the charging container of the first pressure sensor, obtaining the pressure value in the heat pump system of the second pressure sensor, and obtaining the charging weight value of the weighing member; adjusting the regulating valve to a second preset opening degree, so that the pressure difference value 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; determining whether the charging weight value is greater than or equal to the upper limit threshold of charging; if not, continuing to charge; if yes, closing the electromagnetic valve and closing the regulating valve, and ending the charging.

8. The method of charging of claim 7, wherein, The step of if not, continuing to charge further comprises: determining whether the pressure difference value between the pressure in the charging container and the pressure in the heat pump system is less than the lower limit threshold of the pressure difference; if not, returning to the step of continuing to charge; if yes, turning on the heating belt.

9. The method of charging of claim 8, wherein, The step of if yes, turning on the heating belt further comprises: determining whether the pressure value in the charging container remains unchanged for a preset time; if yes, executing the step of closing the electromagnetic valve, closing the regulating valve, closing the heating belt, replacing the charging container, and starting the charging again; if not, executing the step of continuing to charge.

10. The method of charging of claim 9, wherein, The step of if not, executing the step of continuing to charge further comprises: determining whether the pressure value in the charging container is greater than or equal to the upper limit threshold of the pressure; if yes, executing the step of closing the heating belt; if not, executing the step of continuing to charge.

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