Refrigerating system with low refrigerant charge

Abstract

The utility model relates to the technical field of industrial refrigeration, and provides a refrigerating system with low refrigerant charge. A refrigerant low charge refrigeration system includes a refrigeration component and a controller. The refrigerating component comprises a cold using device, a refrigerating compressor, a first condenser and a high-pressure floating ball valve, an air outlet of the cold using device is communicated with an air inlet of the refrigerating compressor, an air outlet of the refrigerating compressor is communicated with an air inlet of the first condenser, and a liquid outlet of the first condenser is communicated with a liquid inlet of the high-pressure floating ball valve; a liquid outlet of the high-pressure floating ball valve communicates with a liquid inlet of the cold using device, and the high-pressure floating ball valve is used for conducting throttling and pressure reduction on a refrigeration pipeline between the first condenser and the cold using device. And the high-pressure floating ball valve is connected with the controller. According to the refrigerating system with the low refrigerant filling amount, normal operation of the refrigerating system can be guaranteed, meanwhile, the filling amount of the refrigerant in the refrigerating system is effectively reduced, the use safety and the environment-friendly effect of the refrigerating system are improved, and the supervision difficulty of the refrigerating system is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial refrigeration, in particular to a refrigeration system with low refrigerant charge. Background Art

[0002] In a conventional vapor compression refrigeration system, a high-pressure container is usually configured. A typical high-pressure container includes a high-pressure liquid storage tank and an auxiliary liquid storage tank. The refrigerant mainly exists in these two containers.

[0003] The high-pressure liquid receiver is mainly used for the storage, distribution, isolation of high and low pressure parts, and maintenance of system operation stability of the refrigerant in the system. When the system is running normally and stably, the high-pressure liquid receiver should maintain 30% to 50% of the volume of refrigerant liquid. The main purpose of this part of liquid refrigerant is to prevent the high and low pressure of the system from being mixed, affecting the normal use of the downstream throttling device, and does not participate in the actual refrigeration cycle.

[0004] The auxiliary liquid reservoir is mainly used for cooling the lubricating oil of the refrigeration compressor unit in the system. Due to the high exhaust temperature of the refrigeration system, in order to maintain the efficient operation of the refrigeration compressor, the "heart" of the refrigeration system, the high-pressure liquid should first meet the cooling of the lubricating oil of the refrigeration unit, and then the supply of liquid to the downstream throttling device. Therefore, the auxiliary liquid reservoir maintains nearly half of the volume of liquid refrigerant storage whether the system is shut down or in shutdown state, and this part of the liquid refrigerant does not participate in the refrigeration system circulation.

[0005] Existing refrigerants mainly use ammonia or Freon as refrigerant. When the filling amount of refrigerants such as ammonia or Freon is too high, it is easy to cause the safety of the refrigeration system, damage the ozone layer and harm the environment, reduce the environmental protection effect of the refrigeration system, and increase the difficulty of regulating the refrigeration system. Utility Model Content

[0006] The utility model aims to solve at least one of the problems existing in the related art. To this end, the utility model proposes a low-refrigerant charge refrigeration system, which can effectively reduce the refrigerant charge in the refrigeration system while ensuring the normal operation of the refrigeration system, so that the refrigeration system does not need to be equipped with high-pressure containers such as high-pressure liquid storage tanks and auxiliary liquid storage tanks, thereby improving the safety and environmental protection effect of the refrigeration system and reducing the difficulty of supervision of the refrigeration system.

[0007] The utility model provides a refrigeration system with low refrigerant charge, comprising:

[0008] A refrigeration component, comprising a refrigeration device, a refrigeration compressor, a first condenser and a high-pressure float valve, wherein an air outlet of the refrigeration device is communicated with an air inlet of the refrigeration compressor, an air outlet of the refrigeration compressor is communicated with an air inlet of the first condenser, a liquid outlet of the first condenser is communicated with a liquid inlet of the high-pressure float valve, a liquid outlet of the high-pressure float valve is communicated with a liquid inlet of the refrigeration device, and the high-pressure float valve is used to control a refrigerant flow rate between the first condenser and the refrigeration device, so as to throttle and reduce the pressure of a refrigeration pipeline between the first condenser and the refrigeration device;

[0009] A controller is provided, wherein the high-pressure float valve is connected to the controller.

[0010] According to a low-refrigerant charge refrigeration system provided by an embodiment of the utility model, the high-pressure float valve forms a valve body inner cavity, a float and a valve stem are arranged in the valve body inner cavity, the first end of the valve stem is connected to the float, and the second end of the valve stem is suitable for controlling the switch of the liquid outlet of the high-pressure float valve.

[0011] According to a low-refrigerant charge refrigeration system provided by an embodiment of the utility model, a flow sensor is provided between the liquid outlet of the high-pressure float valve and the liquid inlet of the cooling device.

[0012] According to an embodiment of the present invention, a low-refrigerant charge refrigeration system is provided, wherein the low-refrigerant charge refrigeration system further comprises:

[0013] A heat exchange component has a heat exchange medium flowing inside, and the heat exchange component is suitable for absorbing the heat generated by the refrigeration compressor through the heat exchange medium.

[0014] According to an embodiment of the utility model, a low-refrigerant charge refrigeration system is provided, wherein the heat exchange component includes a cooler, a first circulating pump and a second condenser, the outlet of the cooler is connected to the inlet of the first circulating pump, the outlet of the first circulating pump is on-off connected to the inlet of the second condenser, the outlet of the second condenser is connected to the inlet of the cooler, and the cooler is used to exchange heat with the refrigeration compressor through the heat exchange medium.

[0015] According to an embodiment of the present invention, a low-refrigerant charge refrigeration system is provided, wherein the low-refrigerant charge refrigeration system further comprises:

[0016] The heat recovery component is connected to the heat exchange component in an on-off manner, and the heat recovery component is suitable for connecting to an external heat-using device.

[0017] According to a low-refrigerant charge refrigeration system provided by an embodiment of the utility model, the heat recovery component includes a heat recovery heat exchanger, a first inlet of the heat recovery heat exchanger is connected to the outlet of the first circulation pump, and the first outlet of the heat recovery heat exchanger is connected to the inlet of the second condenser; the second inlet of the heat recovery heat exchanger is connected to the external heat-using equipment, and the second outlet of the heat recovery heat exchanger is connected to the external heat-using equipment.

[0018] According to a low refrigerant charge refrigeration system provided by an embodiment of the utility model, the heat recovery component further includes:

[0019] A second circulation pump, wherein the inlet of the second circulation pump is communicated with the external heat-using device, and the outlet of the second circulation pump is communicated with the second inlet of the heat recovery heat exchanger.

[0020] According to a low-refrigerant charge refrigeration system provided by an embodiment of the utility model, a control valve assembly is provided between the heat exchange component and the heat recovery component, and the control valve assembly is connected to the controller.

[0021] According to a low-charge refrigeration system of refrigerant provided in an embodiment of the utility model, the control valve assembly includes a first control valve and a second control valve, the first control valve is arranged between the outlet of the first circulation pump and the inlet of the first condenser, and the second control valve is arranged between the first inlet of the heat recovery heat exchanger and the outlet of the first circulation pump;

[0022] Alternatively, the control valve assembly includes a three-way valve, a first interface of the three-way valve is connected to the outlet of the first circulation pump, a second interface of the three-way valve is connected to the inlet of the first condenser, and a third interface of the three-way valve is connected to the first inlet of the heat recovery heat exchanger.

[0023] The above one or more technical solutions in the embodiments of the utility model have at least one of the following technical effects:

[0024] According to the low-refrigerant charge refrigeration system provided by the embodiment of the utility model, the refrigerant flow between the first condenser and the cold user is controlled by a high-pressure float valve to control the refrigerant flow input to the cold user, thereby controlling the flow of gaseous refrigerant in the refrigeration cycle pipeline to achieve control of the refrigerant flow in the refrigeration cycle pipeline, thereby making the refrigerant flow in the refrigeration cycle pipeline sufficient to ensure stable operation of the refrigeration system, without the need to store a certain volume of refrigerant in the refrigeration system, effectively reducing the refrigerant charge in the refrigeration system, and making it unnecessary for the refrigeration system to be equipped with high-pressure containers such as high-pressure liquid storage tanks and auxiliary liquid storage tanks, effectively improving the safety of use and environmental protection of the refrigeration system, and reducing the difficulty of supervision of the refrigeration system.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a schematic diagram of the piping structure of a low-charge refrigerant refrigeration system provided by an embodiment of the utility model;

[0028] Figure 2 It is a structural schematic diagram of a high-pressure float valve provided by an embodiment of the utility model;

[0029] Figure 3 This is another schematic diagram of the piping structure of a low-refrigerant charge refrigeration system provided in an embodiment of the utility model.

[0030] Reference numerals:

[0031] 11. Refrigeration device; 12. Refrigeration compressor; 13. First condenser; 14. High-pressure float valve; 141. Valve body inner cavity; 142. Valve shell; 143. Float; 144. Valve stem; 145. Pressure balance port; 146. Drain port; 147. Manual switch;

[0032] 21. Cooler; 22. First circulation pump; 23. Second condenser; 24. First control valve;

[0033] 31. Heat recovery heat exchanger; 32. Second control valve; 33. Second circulation pump; 41. Three-way valve. DETAILED DESCRIPTION

[0034] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0035] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0037] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0039] Combine the following Figures 1 to 3 The invention describes a low-refrigerant charge refrigeration system provided by an embodiment of the invention.

[0040] Figure 1 The schematic diagram of the piping structure of the low-charge refrigerant refrigeration system provided by the embodiment of the utility model is illustrated as follows: Figure 1 As shown, the refrigerant low-charge refrigeration system includes a refrigeration component and a controller. The refrigeration component includes a cold device 11, a refrigeration compressor 12, a first condenser 13 and a high-pressure float valve 14. The air outlet of the cold device 11 is connected to the air inlet of the refrigeration compressor 12, the air outlet of the refrigeration compressor 12 is connected to the air inlet of the first condenser 13, the liquid outlet of the first condenser 13 is connected to the liquid inlet of the high-pressure float valve 14, the liquid outlet of the high-pressure float valve 14 is connected to the liquid inlet of the cold device 11, and the high-pressure float valve 14 is used to control the refrigerant flow between the first condenser 13 and the cold device 11, so as to throttle and reduce the pressure of the refrigeration pipeline between the first condenser 13 and the cold device 11. The high-pressure float valve 14 is connected to the controller.

[0041] According to the low-charge refrigeration system of refrigerant provided by the embodiment of the utility model, after the refrigerant is input into the cold device 11, the refrigerant absorbs heat and vaporizes to meet the cold demand of the cold device 11. After the vaporized refrigerant is output from the air outlet of the cold device 11, the gaseous refrigerant is sucked into the refrigeration compressor 12, and the gaseous refrigerant is compressed into a high-temperature and high-pressure superheated refrigerant gas by the refrigeration compressor 12, and the high-temperature and high-pressure superheated refrigerant gas is discharged to the first condenser 13 to condense the high-temperature and high-pressure superheated refrigerant gas into a high-pressure normal-temperature refrigerant liquid. Subsequently, the high-pressure normal-temperature refrigerant liquid enters the high-pressure float valve 14, and becomes a low-temperature and low-pressure refrigerant after throttling and reducing the pressure by the high-pressure float valve 14. Finally, the low-temperature and low-pressure refrigerant is re-input into the cold device 11 to absorb heat and vaporize, thereby completing the refrigeration cycle of the refrigerant.

[0042] In the refrigeration cycle of the refrigerant, the refrigerant flow rate between the first condenser 13 and the cooling device 11 is controlled by the high-pressure float valve 14 to control the refrigerant flow rate input into the cooling device 11, thereby controlling the flow rate of the gaseous refrigerant in the refrigeration cycle pipeline, so as to control the refrigerant flow rate in the refrigeration cycle pipeline, and then the refrigerant flow rate in the refrigeration cycle pipeline is sufficient to ensure the stable operation of the refrigeration system. There is no need to store a certain volume of refrigerant in the refrigeration system, which effectively reduces the refrigerant charge in the refrigeration system, and the refrigeration system does not need to be equipped with high-pressure containers such as high-pressure liquid storage tanks and auxiliary liquid storage tanks, which effectively improves the safety of use and environmental protection of the refrigeration system and reduces the difficulty of supervision of the refrigeration system.

[0043] It should be noted here that, in this embodiment, the cooling device 11 can be the low-temperature cooling part corresponding to the direct cooling system, or the low-temperature cooling part corresponding to the indirect cooling system. The refrigeration compressor 12 can be a corresponding refrigeration compression device in a refrigeration compression system such as a single-stage compression system, a multi-stage compression system or a compound compression system, and the heat exchange form of the first condenser 13 can be air cooling, water cooling or evaporative cooling. The specific models or categories of the cooling device 11, the refrigeration compressor 12 and the first condenser 13 can be selected according to the actual application scenario and needs.

[0044] In an embodiment of the present utility model, Figure 2 The structural diagram of the high pressure float valve 14 provided by the embodiment of the utility model is illustrated as follows: Figure 2 As shown, the high-pressure float valve 14 is formed with a valve body inner cavity 141, in which a float 143 and a valve stem 144 are arranged, the first end of the valve stem 144 is connected to the float 143, and the second end of the valve stem 144 is suitable for controlling the switch of the liquid outlet of the high-pressure float valve 14.

[0045] It can be understood that when the high-pressure and normal-temperature refrigerant liquid is input from the first condenser 13 into the valve body inner cavity 141 of the high-pressure float valve 14, the second end of the valve stem 144 closes the liquid outlet of the high-pressure float valve 14, and the liquid level in the valve body inner cavity 141 rises. Under the combined effect of the refrigerant pressure and the liquid level in the valve body inner cavity 141, the float 143 is subjected to buoyancy and pressure to follow the liquid level rise, and drives the valve stem 144 to rise. At this time, the valve stem 144 opens the liquid outlet of the high-pressure float valve 14 to open the high-pressure float valve 14, so that the refrigerant liquid in the high-pressure float valve 14 can be input into the refrigeration cycle pipeline through the liquid outlet of the high-pressure float valve 14.

[0046] When the liquid level in the valve body inner cavity 141 drops, the float 143 drops with the liquid level and drives the valve stem 144 to drop. At this time, the valve stem 144 closes the liquid outlet of the high-pressure float valve 14 to close the high-pressure float valve 14, so that the refrigerant liquid in the high-pressure float valve 14 remains in the valve body inner cavity 141.

[0047] The high-pressure float valve 14 can then control the liquid level in the inner cavity 141 of the valve body to control the refrigerant flow between the high-pressure float valve 14 and the cooling device 11, thereby controlling the refrigerant flow in the refrigeration cycle pipeline.

[0048] In addition, since the float 143 and the valve stem 144 rise according to the refrigerant pressure and the buoyancy of the refrigerant, the refrigerant pressure is indirectly reduced by utilizing the movement of the float 143 and the valve stem 144 to obtain a low-temperature and low-pressure refrigerant liquid.

[0049] Furthermore, since the high-pressure normal-temperature refrigerant liquid pushes the valve stem 144 to open and close the high-pressure float valve 14, the valve stem 144 needs to withstand a large pressure difference, which causes a large impact and wear on the valve stem 144. In order to increase the service life of the high-pressure float valve 14, the valve housing 142 of the high-pressure float valve 14 is provided with a pressure balancing port 145, such as Figure 2 As shown, the pressure equalizing and balancing port 145 is connected to the inner cavity 141 of the valve body. The pressure equalizing and balancing port 145 is used to balance the pressure in the inner cavity 141 of the valve body, thereby reducing the impact and wear received by the valve stem 144 when opening or closing the high-pressure float valve 14, so as to improve the reliability and service life of the valve.

[0050] It should be noted here that Figure 2 As shown, the valve housing 142 is further provided with a drain port 146 , which is communicated with the valve body inner cavity 141 to discharge impurities deposited in the valve body inner cavity 141 by the refrigerant liquid, thereby ensuring that the impurities in the valve body inner cavity 141 will not affect the operation of the high-pressure float valve 14 .

[0051] It should also be noted here that Figure 2 As shown, the valve housing 142 is also provided with a manual switch 147, so that the refrigerant flow output by the high-temperature float valve can be manually adjusted through the manual switch 147 to meet the operating requirements of the refrigeration system. When the float 143 or the valve stem 144 fails, the manual switch 147 can be used to control the opening and closing of the high-pressure float valve 14 to meet the operating requirements of the refrigeration system.

[0052] Furthermore, a flow sensor is provided between the liquid outlet of the high-pressure float valve 14 and the liquid inlet of the cooling device 11, so as to monitor the refrigerant flow in the pipeline between the liquid outlet of the high-pressure float valve 14 and the liquid inlet of the cooling device 11 through the flow sensor, so as to ensure that the refrigerant flow output by the high-pressure float valve 14 can meet the requirements of normal operation of the refrigeration system. When the flow sensor detects that the refrigerant flow is reduced, an alarm can be issued in time, so that the operator can confirm the working condition of the refrigeration system in time, so as to repair the refrigeration system or add refrigerant in time.

[0053] In the embodiments of the present invention, Figure 1 As shown, the low-refrigerant charge refrigeration system further includes a heat exchange component, in which a heat exchange medium flows, and the heat exchange component is suitable for absorbing the heat generated by the refrigeration compressor 12 through the heat exchange medium.

[0054] It is understandable that in the process of the refrigeration compressor 12 compressing the refrigerant gas into a high-temperature and high-pressure refrigerant gas, the refrigeration compressor 12 generates a large amount of heat, which in turn heats the lubricating oil in the refrigeration compressor 12, causing the temperature of the lubricating oil in the refrigeration compressor 12 to rise, resulting in a decrease in the performance of the lubricating oil. In this embodiment, the heat generated by the refrigeration compressor 12 is absorbed by the heat exchange medium in the heat exchange component, thereby reducing the heating effect of the refrigeration compressor 12 on the lubricating oil, so as to cool the lubricating oil so that the lubricating oil can be at a suitable working temperature.

[0055] It should be noted that the heat exchange medium can be a non-phase change medium to ensure that the heat exchange medium only changes in temperature but does not change in phase during the heat exchange process. For example, the heat exchange medium is a non-phase change medium such as water, ethylene glycol, propylene glycol, polyol or saline solution. Of course, the heat exchange medium is not limited to a non-phase change medium, and can also be a refrigerant or other heat exchange medium.

[0056] Specifically, the heat exchange component includes a cooler 21, a first circulating pump 22 and a second condenser 23. The outlet of the cooler 21 is connected to the inlet of the first circulating pump 22, the outlet of the first circulating pump 22 is connected to the inlet of the second condenser 23, and the outlet of the second condenser 23 is connected to the inlet of the cooler 21. The cooler 21 is used to exchange heat with the refrigeration compressor 12 through a heat exchange medium.

[0057] In this embodiment, after the heat exchange medium absorbs the heat generated by the refrigeration compressor 12 in the cooler 21, the heat exchange medium enters the first circulation pump 22. Under the action of the first circulation pump 22, the heat exchange medium is transported to the second condenser 23, so that the second condenser 23 cools the heat exchange medium, and then the cooled heat exchange medium re-enters the cooler 21, so that the cooler 21 can absorb the heat generated by the refrigeration compressor 12 with the low-temperature heat exchange medium, thereby reducing the heating effect of the refrigeration compressor 12 on the lubricating oil, and ensuring that the lubricating oil can be at a suitable working temperature.

[0058] In the embodiments of the present invention, Figure 1 As shown, the low-charge refrigerant refrigeration system also includes a heat recovery component, which is connected to the heat exchange component on and off, and is suitable for connecting to an external heat-using device. Then, by connecting the heat recovery component to the heat exchange component, and connecting the external heat-using device to the heat recovery component, the heat absorbed by the heat exchange component can be transferred to the external heat-using device under the heat exchange between the heat exchange medium and the heat-using medium, so as to complete the utilization of the absorbed heat energy, so that the low-charge refrigerant refrigeration system can have a stable heat recovery source and improve the heat recovery efficiency of the system.

[0059] It should be noted here that the heat-using working fluid and the heat-exchanging working fluid are the same working fluid. For example, when the heat-exchanging working fluid is a non-phase-change working fluid, the heat-using working fluid is also a non-phase-change working fluid.

[0060] Specifically, Figure 1 As shown, the heat recovery component includes a heat recovery heat exchanger 31, a first inlet of the heat recovery heat exchanger 31 is connected to the outlet of the first circulation pump 22, and a first outlet of the heat recovery heat exchanger 31 is connected to the inlet of the second condenser 23. A second inlet of the heat recovery heat exchanger 31 is connected to an external heat-using device, and a second outlet of the heat recovery heat exchanger 31 is connected to an external heat-using device.

[0061] It is understandable that when there is a heat demand in the external heat-using device, the first inlet of the heat recovery heat exchanger 31 is connected to the outlet of the first circulation pump 22, and the heat exchange medium is input into the heat recovery heat exchanger 31 under the action of the first circulation pump 22. At the same time, the external heat-using device inputs the heat-using medium into the heat recovery heat exchanger 31, so that the heat exchange medium and the heat-using medium complete heat exchange in the heat recovery heat exchanger 31. Subsequently, the heat-using medium that has completed the heat exchange is transported to the external heat-using device, thereby providing heat for the external heat-using device. The heat-exchange medium that has completed the heat exchange is transported to the second condenser 23 for cooling to ensure that the temperature of the heat-exchange medium input to the cooler 21 meets the heat exchange requirements.

[0062] It should be noted here that the heat recovery heat exchanger 31 is preferably a partition-type heat exchanger, and the heat exchange medium and the heat-using medium exchange heat with the heat recovery heat exchanger 31 .

[0063] Furthermore, the heat recovery component also includes a second circulation pump 33, the inlet of the second circulation pump 33 is connected to the external heat-using equipment, and the outlet of the second circulation pump 33 is connected to the second inlet of the heat recovery heat exchanger 31, so that the heat-using working medium is driven to be input into the heat recovery heat exchanger 31 through the second circulation pump 33, thereby increasing the flow rate of the heat-using working medium input into the heat recovery heat exchanger 31 to ensure the heat exchange effect between the heat-using working medium and the heat exchange working medium.

[0064] In an embodiment of the utility model, a control valve assembly is arranged between the heat exchange component and the heat recovery component, and the control valve assembly is connected to a controller so that the on-off connection between the heat recovery component and the heat exchange component can be realized through the control valve assembly, thereby facilitating external heat-using equipment to recycle the heat energy absorbed by the heat exchange component.

[0065] Specifically, in order to realize the switching connection between the heat exchange pipeline and the heat recovery pipeline, in this embodiment, the setting mode of the control valve assembly can adopt the following two methods:

[0066] The first setting method is Figure 1As shown, the control valve assembly includes a first control valve 24 and a second control valve 32. The first control valve 24 is arranged between the outlet of the first circulation pump 22 and the inlet of the first condenser 13, and the second control valve 32 is arranged between the first inlet of the heat recovery heat exchanger 31 and the outlet of the first circulation pump 22, so that the circuit between the first circulation pump 22 and the first condenser 13 is opened and closed by the first control valve 24, and the circuit between the heat recovery heat exchanger 31 and the first circulation pump 22 is opened and closed by the second control valve 32, thereby realizing segmented control of the heat exchange circuit and the heat recovery circuit.

[0067] It can be understood that when there is a demand for heat from the external heat-using equipment, the first control valve 24 can be closed and the second control valve 32 can be opened to connect the pipeline between the outlet of the first circulation pump 22 and the first inlet of the heat recovery heat exchanger 31, and disconnect the pipeline between the outlet of the first circulation pump 22 and the inlet of the second condenser 23, so that the heat exchange medium can be fully input into the heat recovery heat exchanger 31, thereby ensuring that the heat recovery medium absorbs the heat absorbed by the heat exchange medium and fully utilizing the heat generated by the refrigeration compressor 12.

[0068] When there is no heat demand from the external heat-using equipment, the first control valve 24 can be opened and the second control valve 32 can be closed to disconnect the pipeline between the outlet of the first circulation pump 22 and the first inlet of the heat recovery heat exchanger 31, and connect the pipeline between the outlet of the first circulation pump 22 and the inlet of the second condenser 23, so that the heat exchange medium can complete the heat exchange cycle in the heat exchange pipeline.

[0069] The second setting method, Figure 3 Another schematic diagram of the piping structure of the low-charge refrigerant refrigeration system provided by the embodiment of the utility model is illustrated, such as Figure 3 As shown, the control valve assembly includes a three-way valve 41, a first interface of the three-way valve 41 is connected to the outlet of the first circulation pump 22, a second interface of the three-way valve 41 is connected to the inlet of the first condenser 13, and a third interface of the three-way valve 41 is connected to the first inlet of the heat recovery heat exchanger 31.

[0070] It can be understood that when there is a demand for heat in the external heat-using equipment, the controller disconnects the first interface of the three-way valve 41 from the second interface of the three-way valve, and connects the first interface of the three-way valve 41 with the third interface of the three-way valve 41, thereby connecting the outlet of the first circulation pump 22 with the first inlet of the heat recovery heat exchanger 31, so that the heat exchange medium can be fully input into the heat recovery heat exchanger 31, thereby ensuring that the heat recovery medium absorbs the heat absorbed by the heat exchange medium, thereby achieving full utilization of the heat generated by the refrigeration compressor 12.

[0071] When there is no heat demand from the external heat-consuming equipment, the controller connects the first interface of the three-way valve 41 with the second interface of the three-way valve 41, and disconnects the first interface of the three-way valve 41 with the third interface of the three-way valve 41, thereby connecting the outlet of the first circulation pump 22 with the inlet of the first condenser 13, so that the heat exchange medium completes the heat exchange cycle in the heat exchange pipeline.

[0072] It should be noted that the first control valve 24 and the second control valve 32 are, for example, electric valves. Of course, the first control valve 24 and the second control valve 32 may also be other valve bodies as long as they can meet the opening adjustment and opening and closing functions.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A low-charge refrigerant refrigeration system, characterized in that: include: A refrigeration component, comprising a refrigeration device, a refrigeration compressor, a first condenser and a high-pressure float valve, wherein an air outlet of the refrigeration device is communicated with an air inlet of the refrigeration compressor, an air outlet of the refrigeration compressor is communicated with an air inlet of the first condenser, a liquid outlet of the first condenser is communicated with a liquid inlet of the high-pressure float valve, a liquid outlet of the high-pressure float valve is communicated with a liquid inlet of the refrigeration device, and the high-pressure float valve is used to control a refrigerant flow rate between the first condenser and the refrigeration device, so as to throttle and reduce the pressure of a refrigeration pipeline between the first condenser and the refrigeration device; A controller is provided, wherein the high-pressure float valve is connected to the controller.

2. The low refrigerant charge refrigeration system according to claim 1, characterized in that: The high-pressure float valve forms a valve body inner cavity, in which a float and a valve stem are arranged, a first end of the valve stem is connected to the float, and a second end of the valve stem is suitable for controlling the switch of the liquid outlet of the high-pressure float valve.

3. The low refrigerant charge refrigeration system according to claim 1, characterized in that: A flow sensor is arranged between the liquid outlet of the high-pressure float valve and the liquid inlet of the cooling device.

4. The low refrigerant charge refrigeration system according to any one of claims 1 to 3, characterized in that: The refrigerant low charge refrigeration system also includes: A heat exchange component has a heat exchange medium flowing inside, and the heat exchange component is suitable for absorbing the heat generated by the refrigeration compressor through the heat exchange medium.

5. The low refrigerant charge refrigeration system according to claim 4, characterized in that: The heat exchange component includes a cooler, a first circulating pump and a second condenser. The outlet of the cooler is connected to the inlet of the first circulating pump, the outlet of the first circulating pump is connected to the inlet of the second condenser, the outlet of the second condenser is connected to the inlet of the cooler, and the cooler is used to exchange heat with the refrigeration compressor through the heat exchange medium.

6. The low refrigerant charge refrigeration system according to claim 5, characterized in that: The refrigerant low charge refrigeration system also includes: The heat recovery component is connected to the heat exchange component in an on-off manner, and the heat recovery component is suitable for connecting to an external heat-using device.

7. The low refrigerant charge refrigeration system according to claim 6, characterized in that: The heat recovery component includes a heat recovery heat exchanger, a first inlet of the heat recovery heat exchanger is connected to the outlet of the first circulation pump, and the first outlet of the heat recovery heat exchanger is connected to the inlet of the second condenser; the second inlet of the heat recovery heat exchanger is connected to the external heat-using equipment, and the second outlet of the heat recovery heat exchanger is connected to the external heat-using equipment.

8. The low refrigerant charge refrigeration system according to claim 7, characterized in that: The heat recovery component also includes: A second circulation pump, wherein the inlet of the second circulation pump is communicated with the external heat-using device, and the outlet of the second circulation pump is communicated with the second inlet of the heat recovery heat exchanger.

9. The low refrigerant charge refrigeration system according to claim 7, characterized in that: A control valve assembly is provided between the heat exchange component and the heat recovery component, and the control valve assembly is connected to the controller.

10. The low refrigerant charge refrigeration system according to claim 9, characterized in that: The control valve assembly comprises a first control valve and a second control valve, wherein the first control valve is arranged between the outlet of the first circulation pump and the inlet of the first condenser, and the second control valve is arranged between the first inlet of the heat recovery heat exchanger and the outlet of the first circulation pump; Alternatively, the control valve assembly includes a three-way valve, a first interface of the three-way valve is connected to the outlet of the first circulation pump, a second interface of the three-way valve is connected to the inlet of the first condenser, and a third interface of the three-way valve is connected to the first inlet of the heat recovery heat exchanger.

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