Refrigerating device, cooling-water machine system and medical imaging equipment

Abstract

The utility model provides a refrigerating device, a water chiller system and medical imaging equipment, the refrigerating device comprises a compressor, a condenser, an evaporator and a flow control valve, the inlet end of the condenser is connected to the outlet end of the compressor through a first pipeline, and the refrigerant inlet end of the evaporator is connected to the output end of the condenser through a second pipeline; the refrigerant inlet end of the evaporator is further connected to the outlet end of the compressor through a third pipeline, and the flow control valve is arranged on the third pipeline and controls the refrigerant flowing through the third pipeline, so that the compressor can be controlled to be kept at the lowest rotating speed when the heat consumption of a heating part is small; and the refrigerant flowing through the third pipeline is controlled by the flow control valve, so that the output temperature of the condenser is matched with the heat consumption, and the problem that the refrigerating capacity is too high under the working condition that the heat consumption is small is avoided.

Description

Technical Field

[0001] The present application belongs to the field of temperature control technology, and in particular relates to a refrigeration device, a chiller system, and medical imaging equipment. Background Art

[0002] In order to solve the heat dissipation requirements of multiple high heat flux density key components in multiple systems of medical equipment, commonly used heat dissipation measures include air cooling, water cooling and electronic fluoride liquid immersion cooling. Among them, the non-conductive working fluid used in the electronic fluoride liquid immersion cooling system can solve the risk of short circuit of electronic devices, but due to the small domestic market, the working fluid is extremely expensive, and because of the compatibility of the fluoride liquid working fluid, the requirements for the material of the loop pipeline are relatively high, so it is rarely used; air cooling has high noise, low heat dissipation capacity and inaccurate temperature control, so it will not be considered in occasions with large heat; water cooling system is often selected because of the large specific heat capacity of water medium, high heat exchange efficiency and low working fluid cost. It is often in the form of liquid cold plate close to the high heat flux density working parts for efficient heat dissipation, but under the use conditions of the cooling system, it must be a closed system, and the heat is blown away by the fan to other locations in the room.

[0003] However, in the current related heat dissipation systems, when the heat consumption of the heat-generating components is small, the core components such as the compressor need to maintain a minimum speed, which makes it impossible to control the cooling capacity and heat consumption to be consistent. At this time, the cooling capacity is greater than the heat generation, causing the water outlet temperature to drop rapidly, which may cause the temperature of the component to exceed the required temperature range. Utility Model Content

[0004] The purpose of the present application is to provide a refrigeration device, a chiller system, and a medical imaging device, which aims to solve the problem that when the heat consumption of the heat-generating components is small, core components such as compressors cannot control their cooling capacity and heat consumption to be consistent while maintaining the minimum speed requirement.

[0005] A first aspect of an embodiment of the present application provides a refrigeration device, the refrigeration device comprising:

[0006] compressor;

[0007] a condenser, wherein an inlet end of the condenser is connected to an outlet end of the compressor via a first pipe;

[0008] an evaporator, wherein a refrigerant inlet end of the evaporator is connected to an output end of the condenser via a second pipe, and the refrigerant inlet end of the evaporator is further connected to an outlet end of the compressor via a third pipe;

[0009] A flow control valve is disposed on the third pipeline and is used to control the refrigerant flowing through the third pipeline.

[0010] In some embodiments, the refrigeration device further comprises:

[0011] An outlet temperature sampling circuit is used to detect the temperature of the coolant outlet end of the evaporator and generate an outlet temperature sampling signal;

[0012] The main control circuit is connected to the outlet temperature sampling circuit and the flow control valve, and is used to generate a flow control signal according to the working state of the compressor and the outlet temperature sampling signal and output it to the flow control valve to control the opening of the flow control valve.

[0013] In some embodiments, the main control circuit is further used to control the opening of the flow control valve when the compressor is at a minimum cooling power and the temperature of the coolant outlet of the evaporator is lower than a preset temperature.

[0014] In some embodiments, the main control circuit is also used to increase the opening of the flow control valve when the temperature of the coolant outlet end of the evaporator is lower than a preset temperature, and to reduce the opening of the flow control valve when the temperature of the coolant outlet end of the evaporator is higher than a preset temperature.

[0015] In some embodiments, the main control circuit is also connected to the compressor, and is used to control the working state of the compressor according to the temperature of the coolant outlet end of the evaporator, the opening of the flow control valve and a preset temperature.

[0016] In some embodiments, the main control circuit is further used to detect the state of the load, and when the heating power of the load is less than or equal to the minimum cooling power of the compressor, control the compressor to maintain working at the minimum cooling power.

[0017] In some embodiments, the flow control valve comprises an electronic expansion valve.

[0018] In some embodiments, the first pipe and the third pipe have the same pipe diameter.

[0019] The second aspect of the embodiments of the present application proposes a chiller system, comprising a liquid cooling device and the refrigeration device described in any one of the above embodiments, the liquid cooling device comprising a liquid cooling plate, the liquid cooling inlet of the liquid cooling plate being connected to the cooling liquid outlet of the evaporator, the liquid cooling outlet of the liquid cooling plate being connected to the cooling liquid inlet of the evaporator, the liquid cooling plate being connected to a cooled object for cooling the cooled object.

[0020] A third aspect of the embodiments of the present application provides a medical imaging device, comprising an imaging device and a refrigeration device as described in any of the above embodiments.

[0021] Compared with the prior art, the embodiments of the present application have the following beneficial effects: the inlet end of the condenser is connected to the outlet end of the compressor via a first pipe, the refrigerant inlet end of the evaporator is connected to the output end of the condenser via a second pipe, and the refrigerant inlet end of the evaporator is also connected to the outlet end of the compressor via a third pipe. By arranging a flow control valve on the third pipe, the flow control valve controls the refrigerant flowing through the third pipe, so that when the heat consumption of the heat-generating component is small, the compressor can be controlled to maintain a minimum speed, and the flow control valve controls the refrigerant flowing through the third pipe, so that the refrigerant flowing into the evaporator is supplied by both the condenser outlet and the compressor outlet, so that the temperature of the refrigerant flowing into the evaporator will not be too low, so as to match the heat consumption, thereby avoiding the problem of excessive cooling capacity under conditions of low heat consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 A schematic diagram of the structure of a refrigeration device provided in an embodiment of the present application Figure 1 ;

[0024] Figure 2 A schematic diagram of the structure of a refrigeration device provided in an embodiment of the present application Figure 2 ;

[0025] Figure 3 A schematic diagram of the structure of a refrigeration device provided in an embodiment of the present application Figure 3 ;

[0026] Figure 4 A schematic diagram of the structure of a chiller system provided in one embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0029] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] Some medical equipment usually has multiple key components with high heat flux density inside. In order to meet their heat dissipation needs, commonly used heat dissipation measures include air cooling, water cooling and electronic fluoride liquid immersion cooling. Among them, the non-conductive working fluid used in the electronic fluoride liquid immersion cooling system can solve the risk of short circuit of electronic devices, but due to the small domestic market, the working fluid is extremely expensive, and because of the compatibility of the fluoride liquid working fluid, the requirements for the material of the loop pipeline are relatively high, so it is rarely used; air cooling has high noise, low heat dissipation capacity and inaccurate temperature control, so it will not be considered in occasions with large heat; water cooling system is often selected because of the large specific heat capacity of water medium, high heat exchange efficiency and low working fluid cost. It is often in the form of a liquid cold plate close to the high heat flux density working parts for efficient heat dissipation, but under the operating conditions of the cooling system, it must be a closed system, and the heat is blown away by the fan to other locations in the room.

[0032] In the case of medical equipment with high heat consumption (up to 15kW), large heat consumption changes (fluctuation from 0 to 15kW) and high precision requirements, the general large cooling capacity chiller can achieve water supply accuracy under stable heat consumption, but when the heat consumption of the heat-generating components is small, the minimum speed requirement of the core components such as the compressor cannot control the cooling capacity and heat consumption to be consistent, resulting in the cooling being greater than the heat output and the outlet water temperature dropping rapidly beyond the required temperature range of the components. For example, when the heat load in the medical equipment is too low, the speed of the variable frequency compressor is too low, resulting in oil return and stopping. For example, the minimum temperature of the heat-generating components in the heat load drops to 16.3℃, which is lower than the minimum temperature of the components required by 16.7℃, and there is a risk of condensation. In this case, the compressor will stop working. When the temperature rises, the compressor load starts, which causes the compressor to start frequently, which has a greater negative impact on its life.

[0033] In order to solve the above technical problems, the present application embodiment proposes a refrigeration device, see Figure 1 As shown, the refrigeration device in this embodiment includes: a compressor 100, a condenser 200, an evaporator 300 and a flow control valve 400. The inlet end of the condenser 200 is connected to the outlet end of the compressor 100 via a first pipe 110, the refrigerant inlet end of the evaporator 300 is connected to the output end of the condenser 200 via a second pipe 120, and the refrigerant inlet end of the evaporator 300 is also connected to the outlet end of the compressor 100 via a third pipe 130. The flow control valve 400 is arranged on the third pipe 130, and the flow control valve 400 is used to control the refrigerant flowing through the third pipe 130.

[0034] When the compressor 100 is working, the compressor 100 absorbs the refrigerant evaporated from the evaporator 300, and after pressurizing it, outputs the pressurized refrigerant to the condenser 200 for cooling and condensation, and distributes heat to the air through the heat sink, at which time the refrigerant changes from gas to liquid. Therefore, the cooling capacity of the evaporator 300 is related to the rotation speed of the compressor 100, and is also related to the content of the refrigerant output from the condenser 200 to the evaporator 300. When the heat consumption of the heat-generating component is small, if all the compressed refrigerant output by the compressor 100 is output to the evaporator 300 via the condenser 200, even if the compressor 100 is maintained at the minimum cooling power, the cooling capacity generated by the refrigerant reaching the evaporator 300 after passing through the condenser 200 may exceed the heat generated by the heat-generating component, which may cause the heat-generating component to be over-cooled, affecting the normal operation of the heat-generating component.

[0035] In this embodiment, the refrigerant inlet end of the evaporator 300 is connected to the output end of the condenser 200 via the second pipe 120, and the refrigerant inlet end of the evaporator 300 is also connected to the outlet end of the compressor 100 via the third pipe 130, so that a part of the compressed refrigerant output by the compressor 100 is output to the evaporator 300 via the condenser 200, and the other part is output to the evaporator 300 via the flow control valve 400. The flow control valve 400 is arranged on the third pipe 130, and the opening degree of the flow control valve 400 is related to the flow rate of the refrigerant flowing through the third pipe 130. The compressed refrigerant output by the compressor 100 is the sum of the content of the refrigerant flowing through the third pipe 130 and the content of the refrigerant flowing through the second pipe 120. The refrigerant input from the refrigerant inlet end of the evaporator 300 is evaporated by the evaporator 300 and then output through the refrigerant outlet end of the evaporator 300 to flow back to the compressor 100. The coolant input from the coolant inlet end of the evaporator 300 is cooled after absorbing heat and then output to the liquid cooling plate through the coolant outlet end of the evaporator 300, thereby dissipating heat for the cooled object. The temperature of the coolant outlet end of the evaporator 300 is closely related to the cooling capacity of the evaporator 300. By controlling the opening of the flow control valve 400, the content of the refrigerant flowing through the third pipe 130 can be controlled, so as to adjust the cooling capacity output to the evaporator 300 via the second pipe 120 and the condenser 200, thereby controlling the temperature of the coolant outlet end of the evaporator 300. When the compressor is in the lowest operating condition, the cooling capacity of the evaporator 300 can be further adjusted, thereby avoiding the problem of excessive cooling capacity generated by the evaporator 300 under the lowest speed condition of the compressor 100.

[0036] In some embodiments, the refrigeration power of the compressor 100 is related to its rotation speed. In specific applications, the lower the rotation speed of the compressor 100, the lower its refrigeration power. When the compressor 100 operates at the minimum threshold rotation speed, the compressor 100 is in the lowest rotation speed condition.

[0037] In some embodiments, see Figure 2 As shown, the refrigeration device also includes an outlet temperature sampling circuit 500 and a main control circuit 610. The outlet temperature sampling circuit 500 is used to detect the temperature of the coolant outlet end of the evaporator 300 and generate an outlet temperature sampling signal; the main control circuit 610 is connected to the outlet temperature sampling circuit 500 and the flow control valve 400, and the main control circuit 610 is used to generate a flow control signal according to the outlet temperature sampling signal and output it to the flow control valve 400 to control the opening of the flow control valve 400.

[0038] In this embodiment, the evaporator 300 converts liquid refrigerant into gaseous refrigerant, and the low-temperature condensed refrigerant exchanges heat through the evaporator 300, vaporizes and absorbs heat, thereby cooling the coolant flowing through the evaporator to achieve a refrigeration effect. The outlet temperature sampling circuit 500 detects the coolant outlet temperature of the evaporator 300 to obtain an outlet temperature sampling signal, and the main control circuit 610 determines whether the compressor 100 is working at the minimum refrigeration power according to the working state of the compressor 100. If the compressor 100 is working at the minimum refrigeration power, a flow control signal can be generated according to the outlet temperature sampling signal. The opening of the flow control valve 400 is adjusted to control the flow of the refrigerant flowing through the third pipe 130, thereby achieving the purpose of adjusting the temperature of the coolant outlet of the evaporator 300. In this way, the problem of excessive cooling capacity generated by the evaporator 300 under the lowest speed condition of the compressor 100 can be avoided.

[0039] In some embodiments, the voltage value of the outlet temperature sampling signal is proportional to the temperature of the coolant outlet end of the evaporator 300. The temperature of the coolant outlet end of the evaporator 300 represents the temperature of the coolant output from the coolant outlet end to the cooling plate. After the coolant exchanges heat with the cooled object (e.g., the heating component) via the liquid cooling plate, it enters the evaporator 300 from the coolant inlet end of the evaporator 300. Therefore, when the heat generated by the heating component is greater than the cooling capacity of the evaporator 300, the coolant absorbs the heat generated by the heating component, and the heated coolant returns to the evaporator through the coolant inlet end of the evaporator 300. If the power of the compressor 100 remains unchanged, the temperature of the coolant outlet end of the evaporator 300 increases. When the heat generated by the heating component is less than the cooling capacity of the evaporator 300, the temperature of the coolant outlet end of the evaporator 300 decreases, which will cause the liquid cooling plate to be lower than the preset temperature, thereby causing the cooled object to be over-cooled.

[0040] In some embodiments, when the compressor 100 is at the minimum cooling power and the temperature of the coolant outlet of the evaporator 300 is lower than the preset temperature, the main control circuit 610 adjusts the opening of the flow control valve 400 according to the corresponding outlet temperature sampling signal, reduces the flow of the refrigerant flowing into the condenser 200, and increases the refrigerant temperature at the refrigerant inlet of the evaporator, thereby achieving the purpose of raising the temperature of the coolant outlet of the evaporator 300, until the temperature of the coolant outlet of the evaporator 300 is stabilized at the preset temperature. When the temperature of the coolant outlet of the evaporator 300 is too high, the main control circuit 610 adjusts the opening of the flow control valve 400 according to the corresponding outlet temperature sampling signal, increases the flow of the refrigerant flowing into the condenser 200, and reduces the refrigerant temperature at the refrigerant inlet of the evaporator, thereby reducing the temperature of the coolant outlet of the evaporator 300, until the temperature of the coolant outlet of the evaporator 300 is stabilized at the preset temperature. In this way, even if the compressor 100 is at the lowest speed, the temperature of the cooling plate can be accurately adjusted.

[0041] In some embodiments, the main control circuit 610 is also used to obtain the coolant outlet temperature of the evaporator 300, and compare the coolant outlet temperature of the evaporator 300 with a preset temperature, and control the opening of the flow control valve 400 according to the comparison result, so as to achieve the purpose of adjusting the coolant outlet temperature of the evaporator 300 to match the heat generation of the heat-generating component.

[0042] In this embodiment, the preset temperature is related to the temperature control range of the heating component. The temperature control range of the heating component represents the normal operating temperature of the heating component. When the compressor 100 is operating at the lowest speed, if the temperature of the coolant outlet end of the evaporator 300 is low, it may cause the temperature of the heating component to be low. At this time, the temperature of the coolant outlet end of the evaporator 300 is lower than the preset temperature, the heat absorbed by the coolant output by the evaporator 300 does not meet expectations, and the temperature of the coolant returning to the evaporator 300 is lower than the preset temperature. Since the power of the compressor 100 has reached the minimum power, its refrigeration power can no longer be reduced, and the heating component may be over-cooled. By setting the difference between the coolant outlet temperature of the evaporator 300 and the preset temperature to be positively correlated with the opening of the flow control valve 400, when the temperature of the refrigerant output by the condenser 200 is too low, the evaporator 300 will output excessive cooling capacity, and the temperature of the coolant outlet of the evaporator 300 is too low. In order to balance the temperature of the coolant outlet of the evaporator 300 so that the temperature of the coolant output by the evaporator 300 matches the heat generation of the heating component, it is necessary to increase the temperature of the refrigerant flowing into the evaporator 300. The outlet temperature is lower than the preset temperature, and the greater the difference between the outlet temperature and the preset temperature, the greater the opening of the flow control valve 400. At this time, the flow rate of the refrigerant flowing from the compressor 100 to the condenser 200 is reduced, while the flow rate of the refrigerant flowing directly through the compressor 100 to the refrigerant inlet of the evaporator 300 is increased. At this time, the refrigerant temperature at the refrigerant inlet of the evaporator 300 will increase, and the cooling capacity of the evaporator 300 will decrease, thereby achieving the purpose of increasing the temperature of the coolant outlet of the evaporator 300, until the temperature of the coolant outlet of the evaporator 300 reaches the preset temperature.

[0043] In some embodiments, when the compressor 100 is operating at the lowest speed, if the cooling capacity of the evaporator 300 is lower than the heating value of the heat-generating component, the coolant output by the evaporator 300 will absorb more heat. At this time, the temperature of the coolant flowing back to the coolant inlet end of the evaporator 300 is relatively high, and the temperature of the coolant outlet end of the evaporator 300 is higher than the preset temperature. Therefore, by reducing the opening of the flow control valve 400, the flow rate of the refrigerant flowing from the compressor 100 to the condenser 200 is increased, and the flow rate of the refrigerant flowing directly through the compressor 100 to the refrigerant inlet end of the evaporator 300 is reduced, thereby reducing the temperature of the refrigerant inlet end of the evaporator 300, increasing the cooling capacity of the evaporator 300, and reducing the temperature of the coolant outlet end of the evaporator 300, thereby gradually making the temperature of the coolant outlet end of the evaporator 300 reach the preset temperature, so as to achieve the purpose of balancing the cooling capacity of the evaporator 300 and the heating value of the heat-generating component.

[0044] In some embodiments, the flow control valve 400 includes an electronic expansion valve, which is controlled by a flow control signal and can adjust the content of the refrigerant flowing through the third pipe 130 .

[0045] In some embodiments, the first pipe 110 and the third pipe 130 have the same diameter.

[0046] In some embodiments, the first pipe 110 and the third pipe 130 partially overlap, so that the first pipe 110 and the third pipe 130 form a Y-shaped pipe or a T-shaped pipe.

[0047] In some embodiments, see Figure 4 As shown, the main control circuit 610 is connected to the outlet temperature sampling circuit 500 and the compressor 100. The main control circuit 610 controls the working state of the compressor 100 according to the coolant outlet temperature of the evaporator 300, the opening of the flow control valve 400 and the preset temperature.

[0048] In this embodiment, the preset temperature is related to the temperature control range of the object to be cooled, and the temperature control range of the object to be cooled represents the normal working temperature of the object to be cooled. When the opening of the flow control valve 400 is set to 0, if the temperature of the coolant outlet of the evaporator 300 is higher than the preset temperature, the purpose of increasing the refrigeration capacity of the evaporator 300 can be achieved by increasing the refrigeration power of the compressor 100. Therefore, when the opening of the flow control valve 400 is set to 0 and the temperature of the coolant outlet of the evaporator 300 is higher than the preset temperature, by setting the difference between the coolant outlet temperature of the evaporator 300 and the preset temperature to be positively correlated with the rotation speed of the compressor 100, the greater the difference between the coolant outlet temperature of the evaporator 300 and the preset temperature, the greater the rotation speed of the compressor 100, and the refrigeration capacity of the evaporator 300 is increased, so as to achieve the purpose of quickly cooling the object to be cooled, until the temperature of the object to be cooled is maintained at the preset temperature.

[0049] In some embodiments, the main control circuit 610 is further used to detect the state of the load, and when the heating power of the load is less than or equal to the minimum cooling power of the compressor 100 , control the compressor 100 to maintain working at the minimum cooling power.

[0050] In this embodiment, when the heating power of the load is less than or equal to the minimum cooling power of the compressor 100, the heat generated by the cooled object inside the load is small, and the heating power of the load is also at a minimum value. By controlling the compressor 100 to operate at the minimum threshold speed, the cooling power of the compressor 100 reaches the minimum cooling power, so that the evaporator 300 generates a minimum cooling capacity.

[0051] In some embodiments, if the minimum cooling power of the compressor 100 is greater than the heating power of the load, when the opening of the flow control valve 400 is 0, the cooling capacity of the evaporator 300 will exceed the calorific value of the cooled object. At this time, the coolant outlet temperature of the evaporator 300 is lower than the preset temperature. The purpose of adjusting the coolant outlet temperature of the evaporator 300 can be achieved by adjusting the opening of the flow control valve 400.

[0052] The present application also proposes a chiller system, see Figure 3 As shown, the chiller system includes a liquid cooling device and a refrigeration device described in any of the above embodiments. The liquid cooling device includes a liquid cooling plate 700, a liquid cooling inlet of the liquid cooling plate 700 is connected to a cooling liquid outlet of the evaporator 300, a liquid cooling outlet of the liquid cooling plate 700 is connected to a cooling liquid inlet of the evaporator 300, and the liquid cooling plate 700 is connected to a cooled object, and the liquid cooling plate 700 is used to cool the cooled object.

[0053] In some embodiments, the liquid cooling inlet of the liquid cooling plate 700 can be connected to the cooling liquid outlet of the evaporator 300 via the first heat dissipation pipe 710, and the liquid cooling outlet of the liquid cooling plate 700 can be connected to the cooling liquid inlet of the evaporator 300 via the second heat dissipation pipe 720, and the outlet temperature sampling circuit 500 is arranged in the first heat dissipation pipe 710 between the cooling liquid outlet end of the evaporator 300 and the liquid cooling inlet of the liquid cooling plate 700.

[0054] In this embodiment, the outlet temperature sampling circuit 500 can monitor the temperature of the coolant flowing into the inlet of the liquid cooling plate 700, and the main control circuit 610 can control the opening of the flow control valve 400 according to the monitoring results. By setting the refrigeration device described in any of the above embodiments in the chiller system, the cooled object (for example, the heat-generating component) can meet the set temperature control range under any operating condition within the rated power range, thereby realizing high-precision temperature control and regulation of the cooled object.

[0055] In some embodiments, the outlet temperature sampling circuit 500 may include a temperature sensor, and the temperature sensor is connected to the main control circuit 610 .

[0056] In some embodiments, if the temperature of the coolant outlet end of the evaporator 300 is higher than the preset temperature, or gradually increases, it means that the cooling capacity of the evaporator 300 is less than the calorific value of the cooled object, and it is necessary to gradually reduce the opening of the flow control valve 400. When the opening of the flow control valve 400 is set to 0, and the temperature of the coolant outlet end of the evaporator 300 is still higher than the preset temperature, it is necessary to gradually increase the speed of the compressor 100 to increase the cooling capacity of the evaporator 300, so that the cooling capacity of the evaporator 300 matches the calorific value of the cooled object until the cooled object is maintained at the set temperature.

[0057] In some embodiments, when the temperature of the coolant outlet end of the evaporator 300 is higher than the preset temperature, the main control circuit 610 immediately sets the opening of the flow control valve 400 to 0, and all the compressed refrigerant output by the compressor 100 is output to the evaporator 300 via the condenser 200. The liquid refrigerant in the evaporator 300 changes to gas, and absorbs a large amount of heat in the air through the heat sink, thereby achieving the effect of increasing the cooling capacity, so that the liquid cooling device connected to the evaporator 300 can quickly reduce the temperature of the cooled object to within the temperature control range of the cooled object.

[0058] In some embodiments, a third pipe 130 may be added at the outlet of the compressor 100 as a bypass line to connect the refrigerant inlet of the evaporator 300, and a flow control valve 400 may be added in the third pipe 130. The opening of the flow control valve 400 is adjusted by the temperature feedback of the coolant outlet of the evaporator 300, thereby controlling the coolant outlet temperature of the evaporator 300. The bypass line allows part of the high-temperature refrigerant that has not passed through the condenser to flow directly into the refrigerant inlet of the evaporator, so that the temperature of the refrigerant entering the evaporator 300 increases, thereby controlling the compressor 100 to improve the temperature control accuracy and temperature control ability under the lowest refrigeration power, and avoiding the risk of the outlet water temperature exceeding the expected range due to the large refrigeration capacity of the compressor 100.

[0059] An embodiment of the present application further provides a medical imaging device, comprising an imaging device and a refrigeration device as described in any of the above embodiments.

[0060] In some embodiments, the medical imaging device can be a medical device. Taking a computer tomography machine (CT machine) as an example, the refrigeration device described in any of the above embodiments is used in the CT machine, and the temperature of the heating components in the CT machine can be flexibly controlled, so that the heating components can meet the temperature control range of 18°C±0.2°C under the working conditions of 0-5kW, which not only meets expectations but also has better energy-saving effects than the current temperature control system.

[0061] Compared with the prior art, the embodiments of the present application have the following beneficial effects: the refrigeration device includes a compressor, a condenser, an evaporator and a flow control valve; the inlet end of the condenser is connected to the outlet end of the compressor via a first pipe, the refrigerant inlet end of the evaporator is connected to the output end of the condenser via a second pipe, and the refrigerant inlet end of the evaporator is also connected to the outlet end of the compressor via a third pipe; by arranging the flow control valve on the third pipe, the refrigerant flowing through the third pipe is controlled by the flow control valve, so that when the heat consumption of the heat-generating component is small, the compressor can be controlled to maintain the minimum speed, and the refrigerant flowing through the third pipe is controlled by the flow control valve, so that the output temperature of the condenser matches the heat consumption, thereby avoiding the problem of excessive cooling capacity under conditions of small heat consumption.

[0062] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A refrigeration device, characterized in that: The refrigeration device comprises: compressor; a condenser, wherein an inlet end of the condenser is connected to an outlet end of the compressor via a first pipe; an evaporator, wherein a refrigerant inlet end of the evaporator is connected to an output end of the condenser via a second pipe, and the refrigerant inlet end of the evaporator is further connected to an outlet end of the compressor via a third pipe; A flow control valve is disposed on the third pipeline and is used to control the refrigerant flowing through the third pipeline.

2. The refrigeration device according to claim 1, characterized in that: The refrigeration device also includes: An outlet temperature sampling circuit is used to detect the temperature of the coolant outlet end of the evaporator and generate an outlet temperature sampling signal; The main control circuit is connected to the outlet temperature sampling circuit and the flow control valve, and is used to generate a flow control signal according to the working state of the compressor and the outlet temperature sampling signal and output it to the flow control valve to control the opening of the flow control valve.

3. The refrigeration device according to claim 2, characterized in that: The main control circuit is also used to control the opening of the flow control valve when the compressor is at a minimum cooling power and the temperature of the coolant outlet end of the evaporator is lower than a preset temperature.

4. The refrigeration device according to claim 3, characterized in that: The main control circuit is also used to increase the opening of the flow control valve when the temperature of the coolant outlet end of the evaporator is lower than a preset temperature, and to reduce the opening of the flow control valve when the temperature of the coolant outlet end of the evaporator is higher than a preset temperature.

5. The refrigeration device according to claim 3, characterized in that: The main control circuit is also connected to the compressor and is used to control the working state of the compressor according to the temperature of the coolant outlet end of the evaporator, the opening of the flow control valve and a preset temperature.

6. The refrigeration device according to claim 3, characterized in that: The main control circuit is also used to detect the state of the load, and when the heating power of the load is less than or equal to the minimum cooling power of the compressor, control the compressor to maintain working at the minimum cooling power.

7. The refrigeration device according to any one of claims 1 to 3, characterized in that: The flow control valve includes an electronic expansion valve.

8. The refrigeration device according to any one of claims 1 to 3, characterized in that: The first pipeline and the third pipeline have the same diameter.

9. A chiller system, characterized in that: It comprises a liquid cooling device and a refrigeration device as described in any one of claims 1 to 6, wherein the liquid cooling device comprises a liquid cooling plate, the liquid cooling inlet of the liquid cooling plate is connected to the cooling liquid outlet of the evaporator, the liquid cooling outlet of the liquid cooling plate is connected to the cooling liquid inlet of the evaporator, and the liquid cooling plate is connected to a cooled object for cooling the cooled object.

10. A medical imaging device, characterized in that: The invention comprises an imaging device and a refrigeration device as claimed in any one of claims 1 to 6.

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