Refrigerating apparatus and freezer
By combining the operation of dual compression systems and heat exchange technology, the problem of frequent start-stop of the refrigeration compressor in the freeze-thaw machine is solved, achieving a long service life and efficient temperature control for the freeze-thaw machine.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- QINGDAO HAIER BIOMEDICAL CO LTD
- Filing Date
- 2023-03-20
- Publication Date
- 2026-07-31
AI Technical Summary
The problem of shortened service life caused by frequent start-stop of the refrigeration compressor in existing freeze-thaw machines.
The system employs a dual compression system design. By combining the operation of the first and second compression systems, heat exchange is achieved between the high-pressure refrigerant in the second compression system and the refrigerant pipeline, thereby maintaining the temperature of the target object and avoiding frequent start-stop operations.
It extends the service life of the refrigeration unit, avoids frequent compressor start-stop, and improves temperature control accuracy and energy efficiency.
Smart Images
Figure CN116222033B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of refrigeration equipment technology, specifically relating to a refrigeration device and a freeze-thaw machine. Background Technology
[0002] Freeze-thaw machines, as a type of refrigeration equipment, are widely used in the field of biopharmaceuticals for the freezing and thawing of protein stock solutions, as well as for the research and development and property studies of related laboratory products.
[0003] The temperature control range of a freeze-thaw machine is -82 to 35℃. In actual production operations, it is often necessary to use a freeze-thaw machine to control the temperature at a certain set temperature. In related technologies, in order to maintain the freeze-thaw machine at a certain set temperature, the refrigeration compressor needs to be shut down when the temperature is lower than the set temperature to avoid the output temperature of the freeze-thaw machine being too low; when the temperature is higher than the set temperature, the refrigeration compressor needs to be turned on to avoid the output temperature of the freeze-thaw machine being too high.
[0004] However, frequent starting and stopping of the refrigeration compressor can easily damage the compressor and shorten the service life of the freezer. Summary of the Invention
[0005] In order to solve the above-mentioned problems in the prior art, namely the problem that the compressor of the refrigeration equipment in the related art is prone to damage, the present invention provides a refrigeration device and a freeze-thaw machine.
[0006] Firstly, the refrigeration device is used to cool a target object. Specifically, the refrigeration device includes refrigerant piping, a first compression system, and a second compression system. The refrigerant piping is used to cool the target object. The refrigerant piping includes a first heat exchanger and a second heat exchanger. The first compression system includes a first high-pressure piping, a third heat exchanger disposed on the first high-pressure piping, and a first low-pressure piping connected to the first high-pressure piping. The first low-pressure piping is connected to the first heat exchanger, and the first low-pressure piping cools the refrigerant piping through the first heat exchanger. The second compression system includes a second low-pressure piping, a second high-pressure piping, and a third high-pressure piping connected to the third heat exchanger. The second high-pressure piping and the third high-pressure piping are uniformly connected to the second low-pressure piping, and the third high-pressure piping is connected in parallel with the second high-pressure piping. Furthermore, the second high-pressure piping is connected to the second heat exchanger, and the second high-pressure piping heats the refrigerant piping through the second heat exchanger.
[0007] In the aforementioned refrigeration device, the second low-pressure pipeline in the second compression system can exchange heat with the first high-pressure pipeline in the first compression system through a third heat exchanger, thereby helping to lower the temperature of the refrigerant in the first high-pressure pipeline. During the process of the refrigerant in the first high-pressure pipeline entering the first low-pressure pipeline, the pressure of the refrigerant is released. Furthermore, the refrigerant in the first low-pressure pipeline exchanges heat with the refrigerant pipeline through the first heat exchanger, absorbing heat and evaporating, thereby lowering the temperature of the refrigerant in the refrigerant pipeline for use in cooling the target object.
[0008] Furthermore, the second high-pressure pipeline is connected to the second heat exchanger, allowing the refrigerant in the second high-pressure pipeline to exchange heat with the refrigerant in the refrigerant pipeline through the second heat exchanger, thereby increasing the temperature of the refrigerant in the refrigerant pipeline. During the cooling process of the refrigeration unit, the first and second compression systems can operate synchronously until the target object reaches the set temperature. After the target object's temperature reaches the set value, the first and second compression systems can remain running, and the refrigerant in the refrigerant pipeline can be heated by connecting the second high-pressure pipeline, thereby preventing the target object's temperature from continuously decreasing and maintaining the target object's temperature at the set temperature.
[0009] Therefore, the refrigeration device provided above can maintain the target object at a set temperature without shutting down the first and second compression systems, thereby avoiding the frequent start-up and operation of the first and second compression systems, which is beneficial to improving the service life of the refrigeration device.
[0010] In some alternative implementations, the second high-pressure pipeline is equipped with a first valve, which is used to regulate the flow rate of the second high-pressure pipeline. Thus, during the cooling process of the refrigeration unit, the amount of heat transferred from the refrigerant in the second high-pressure pipeline to the refrigerant in the refrigerant pipeline can be controlled by adjusting the opening degree of the first valve.
[0011] In some alternative implementations, the third high-pressure line is equipped with a second valve, which is used to regulate the flow rate of the third high-pressure line. Thus, during the cooling process of the refrigeration unit, the flow rate of the refrigerant in the third high-pressure line can be controlled by adjusting the opening degree of the second valve.
[0012] In some alternative implementations, the second compression system further includes a first check valve disposed in the second high-pressure line. This allows the first check valve to limit the flow direction of the refrigerant in the second high-pressure line, thereby preventing refrigerant backflow.
[0013] In some alternative implementations, the second compression system further includes a first compressor and a first pressure relief device, wherein the medium inlet of the first compressor and the medium outlet of the first pressure relief device are connected through a second low-pressure pipeline; and the medium outlet of the first compressor and the medium inlet of the first pressure relief device are connected through a second high-pressure pipeline and a third high-pressure pipeline.
[0014] In the refrigeration device described above, the second compression system can compress the medium in the second compression system using the first compressor. Specifically, the medium in the second compression system can be a refrigerant. The high-pressure medium is transmitted to the first pressure relief device through a second high-pressure pipeline and / or a third high-pressure pipeline to release the pressure of the high-pressure medium and form a low-pressure medium. Furthermore, in the above embodiments, the medium in the second compression system can be recycled.
[0015] In some alternative implementations, the second compression system further includes a fourth high-pressure line, the first end of which is connected to the medium inlet of the first pressure relief device, and the second end of which is connected to both the second and third high-pressure lines. Thus, the medium discharged from the first compressor can enter the fourth high-pressure line from either the second or third high-pressure line, and then enter the first pressure relief device via the fourth high-pressure line.
[0016] In some alternative implementations, the refrigeration device further includes a cooling line, and the second compression system further includes a fourth heat exchanger disposed in the fourth high-pressure line. The cooling line is connected to the fourth heat exchanger, and the cooling line cools the fourth high-pressure line through the fourth heat exchanger.
[0017] In this way, the cooling pipes can cool the medium in the fourth high-pressure pipe, which is beneficial to reducing the temperature of the medium in the second low-pressure pipe, and thus helps to increase the temperature control range of the refrigeration unit.
[0018] In some alternative implementations, the first compression system further includes a fifth heat exchanger disposed in the first high-pressure pipeline, a cooling pipeline connected to the fifth heat exchanger, and the cooling pipeline cools the first high-pressure pipeline through the fifth heat exchanger.
[0019] In this way, the cooling pipes can cool the medium in the first high-pressure pipe, which is beneficial to reducing the temperature of the medium in the first low-pressure pipe, and thus helps to increase the temperature control range of the refrigeration device.
[0020] In some alternative implementations, the first compression system further includes a second compressor and a second pressure relief device, wherein the medium inlet of the second compressor and the medium outlet of the second pressure relief device are connected via a first low-pressure line. The medium outlet of the second compressor and the medium inlet of the second pressure relief device are connected via a first high-pressure line.
[0021] In this way, the medium in the first compression system can be recycled, which is beneficial for continuously providing cooling capacity to the refrigerant pipeline through the first compression system.
[0022] In some alternative implementations, the refrigeration unit also includes a circulation pump, and the circulation pump, the first heat exchanger, and the second heat exchanger are connected in series via piping.
[0023] In the aforementioned refrigeration device, the circulating pump enables continuous circulation of the refrigerant within the refrigerant piping. The freeze-thaw chamber provides space for the target object. The heater provides heat to the refrigerant piping when the heat exchanger from the second heat exchanger is insufficient, allowing the refrigeration device to maintain the temperature within the freeze-thaw chamber at the set temperature.
[0024] On the other hand, this application also provides a freeze-thaw machine. This freeze-thaw machine has the same technical features as the refrigeration device provided in this application and can achieve the same technical effects, which will not be described in detail here.
[0025] In some alternative implementations, the freeze-thaw machine further includes a heater, a circulating pump, and a freeze-thaw chamber, both of which are located within the refrigerant piping. The heater is used to heat the refrigerant piping. The freeze-thaw chamber provides space for the target object. Attached Figure Description
[0026] Preferred embodiments of the refrigeration apparatus provided by the present invention will now be described with reference to the accompanying drawings. The drawings are as follows:
[0027] Figure 1 This is a schematic diagram of the freeze-thaw machine of the present invention. Figure 1 ;
[0028] Figure 2 This is a schematic diagram of the freeze-thaw machine of the present invention. Figure 2 ;
[0029] Figure 3 This is a schematic diagram of the freeze-thaw machine of the present invention. Figure 3 .
[0030] Explanation of reference numerals in the attached figures:
[0031] 100 - Refrigerant piping; 110 - First heat exchanger; 120 - Second heat exchanger; 130 - Heater; 140 - Circulation pump; 150 - Freeze-thaw chamber; 160 - Buffer tank; 170 - Sixth heat exchanger;
[0032] 200 - First compression system; 210 - First high-pressure pipeline; 211 - Fourth sub-line; 212 - Fifth sub-line; 220 - Third heat exchanger; 230 - First low-pressure pipeline; 240 - Fifth heat exchanger; 250 - Second compressor; 260 - Second pressure relief device; 270 - Second check valve; 280 - Oil separator; 290 - First gas-liquid separator;
[0033] 300 - Second compression system; 310 - Second low-pressure pipeline; 320 - Second high-pressure pipeline; 321 - First valve; 330 - First check valve; 340 - First compressor; 350 - First pressure relief device; 360 - Fourth heat exchanger; 370 - Second gas-liquid separator; 380 - Third high-pressure pipeline; 381 - Second valve; 390 - Fourth high-pressure pipeline;
[0034] 400 - Cooling piping.
[0035] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0036] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific applications. For example, although the refrigeration device of the present invention is described in conjunction with a freeze-thaw machine, this is not limiting; other devices with refrigeration equipment can be configured with the refrigeration device provided by the present invention, such as air conditioners, refrigerators, and freezers.
[0037] Secondly, it should be noted that in the description of this invention, terms such as "inner" and "outer" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.
[0038] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0039] In related technologies, to reduce compressor start-stop cycles, after the target object's temperature reaches a first set temperature, the compressor is kept running while the circulation pipeline is blocked to stop the refrigerant flow within it. As the target object's temperature gradually rises to a second set temperature, the circulation pipeline is opened to allow the refrigerant to flow and cool the target object. After the target object's temperature reaches the first set temperature, the above steps are repeated to maintain the target object's temperature within the set range.
[0040] However, when the refrigerant temperature reaches the first set temperature, the refrigeration compressor operates, the circulation pipeline is blocked, and the system pressure at the compressor's discharge end increases, causing a large amount of liquid refrigerant to enter the receiver tank. When the temperature of the target object rises back to the second set temperature, the circulation pipeline is opened, and the unevaporated refrigerant in the circulation pipeline returns directly to the compressor, which in turn damages the compressor due to the excessive flow of refrigerant.
[0041] To address the aforementioned technical problems, this application provides a refrigeration device. The refrigeration device includes a first-stage compression system, a second-stage compression system, and refrigerant piping for cooling a target object. The refrigerant in the low-pressure piping of the first-stage compression system exchanges heat with the refrigerant in the refrigerant piping, thereby cooling the refrigerant in the refrigerant piping. The low-pressure piping of the second-stage compression system exchanges heat with the high-pressure piping of the first-stage compression system through a heat exchanger, allowing the refrigerant in the low-pressure piping of the first-stage compression system to reach an even lower temperature, thus improving the refrigeration performance of the refrigerant.
[0042] In addition, the high-pressure pipeline of the second-stage compression system is divided into a second high-pressure pipeline and a third high-pressure pipeline. The high-pressure refrigerant discharged from the compressor of the second-stage compression system can pass through the third high-pressure pipeline and, after depressurization, enter the low-pressure pipeline of the second-stage compression system to obtain low-pressure refrigerant. The high-pressure refrigerant discharged from the compressor of the second-stage compression system can also exchange heat with the refrigerant in the refrigerant pipeline through a heat exchanger via the second high-pressure pipeline, thereby heating the refrigerant in the refrigerant pipeline.
[0043] Specifically, when cooling the target object using the aforementioned refrigeration device, the high-pressure refrigerant in the second-stage compression system can be controlled to enter the low-pressure pipeline of the second-stage compression system via the third high-pressure pipeline. This allows the cooling capacity generated in the second-stage compression system to be transferred to the refrigerant pipeline through the first-stage compression system, lowering the temperature of the refrigerant in the refrigerant pipeline. Furthermore, when the target object's temperature reaches the set temperature, the high-pressure refrigerant in the second-stage compression system is controlled to enter the low-pressure pipeline of the second-stage compression system via the second high-pressure pipeline. In this way, the refrigerant in the second high-pressure pipeline can heat the refrigerant pipeline, ensuring that the refrigerant in the refrigerant pipeline reaches the set temperature, thereby maintaining the temperature of the target object.
[0044] Therefore, the refrigeration device provided above can avoid frequent start-stop of the compressor in the refrigeration equipment, thereby helping to extend the service life of the refrigeration device.
[0045] The following is combined Figures 1 to 3 The preferred technical solution of the refrigeration equipment of the present invention is described.
[0046] In some optional embodiments, this application provides a refrigeration device. This refrigeration device can be used to refrigerate a target object. Specifically, the target object can be a physical object or an independent space. For example, the target object can be protein stock solution or a refrigerator in the biopharmaceutical field.
[0047] Reference Figure 1 In some optional embodiments, the refrigeration device includes a refrigerant line 100, a first compression system 200, and a second compression system 300. Exemplarily, the refrigerant line 100 is used to cool a target object. The first compression system 200 and the second compression system 300 are used to provide cooling capacity to the refrigerant line 100.
[0048] Reference Figure 1 The refrigerant pipeline 100 includes a first heat exchanger 110 and a second heat exchanger 120, so that the refrigerant in the refrigerant pipeline 100 can exchange heat through the first heat exchanger 110 and the second heat exchanger 120. For example... Figure 1 As shown, the refrigerant line 100 is a circulation loop so that the refrigerant in the refrigerant line 100 can circulate in the refrigerant line 100.
[0049] In some optional embodiments, both the first heat exchanger 110 and the second heat exchanger 120 include a high-temperature heat exchange tube and a low-temperature heat exchange tube. Specifically, during the heat exchange process, a higher-temperature medium is introduced into the high-temperature heat exchange tube, and a lower-temperature medium is introduced into the low-temperature heat exchange tube, so that heat can be transferred from the high-temperature heat exchange tube to the low-temperature heat exchange tube, and cold energy can be transferred from the low-temperature heat exchange tube to the high-temperature heat exchange tube.
[0050] In a further optional embodiment, the refrigerant line 100 is connected to the high-temperature heat exchange tube of the first heat exchanger 110. The refrigerant line 100 is also connected to the low-temperature heat exchange tube of the second heat exchanger 120. Thus, when the refrigerant line 100 needs to cool a target object, the second heat exchanger 120 can be shut off, allowing the refrigerant line 100 to obtain cooling only through the first heat exchanger 110, thereby achieving the purpose of cooling the target object. In an optional embodiment, shutting off the second heat exchanger 120 can block the flow of refrigerant within the high-temperature heat exchange tube of the second heat exchanger 120.
[0051] In some alternative application scenarios, the refrigerant pipeline 100 can be cooled by the first heat exchanger 110 and then heated by the second heat exchanger 120, so that the temperature of the refrigerant pipeline 100 can be maintained within a set temperature range, thereby maintaining the temperature of the target object within the set temperature range.
[0052] For example, when it is necessary to maintain the temperature of the target object through the refrigerant pipeline 100, the second heat exchanger 120 can be opened, that is, the high-temperature heat exchange tube of the second heat exchanger 120 can be opened, so that the refrigerant inside the high-temperature heat exchange tube can flow, and the high-temperature heat exchange tube can heat the refrigerant pipeline 100. In this way, the temperature of the refrigerant inside the refrigerant pipeline 100 can be close to the temperature of the target object, and thus the temperature of the target object can be maintained through the refrigerant pipeline 100.
[0053] Reference Figure 1 In some optional embodiments, the first compression system 200 includes a first high-pressure pipeline 210, a third heat exchanger 220 disposed on the first high-pressure pipeline 210, and a first low-pressure pipeline 230 connected to the first high-pressure pipeline 210. The first low-pressure pipeline 230 is connected to the first heat exchanger 110, and the first low-pressure pipeline 230 cools the refrigerant pipeline 100 through the first heat exchanger 110.
[0054] For example, the first high-pressure line 210 and the first low-pressure line 230 form a loop so that the refrigerant in the first compression system 200 can circulate within the first high-pressure line 210 and the first low-pressure line 230.
[0055] In some optional embodiments, the first low-pressure line 230 is connected to the low-temperature heat exchange tube in the first heat exchanger 110, so that the refrigerant in the first compression system 200 can circulate through the first heat exchanger 110 and cool the refrigerant line 100 through the first heat exchanger 110. Specifically, the refrigerant in the first low-pressure line 230 is heated and evaporated in the first heat exchanger 110, thereby reducing the refrigerant level in the refrigerant line 100 to achieve cooling of the refrigerant line 100.
[0056] Reference Figure 1The second compression system 300 includes a second low-pressure pipeline 310, a second high-pressure pipeline 320, and a third high-pressure pipeline 380. The second low-pressure pipeline 310 is connected to a third heat exchanger 220 so that the second low-pressure pipeline 310 cools the first high-pressure pipeline 210 through the third heat exchanger 220.
[0057] In a further optional embodiment, both the second high-pressure line 320 and the third high-pressure line 380 are connected to the second low-pressure line 310. Exemplarily, the second high-pressure line 320 and the second low-pressure line 310 form a circulation loop. The third high-pressure line 380 and the second low-pressure line 310 also form a circulation loop. Thus, the high-pressure refrigerant released from the second high-pressure line 320 and the third high-pressure line 380 enters the second low-pressure line 310.
[0058] In further optional embodiments, such as Figure 1 As shown, the third high-pressure pipeline 380 is connected in parallel with the second high-pressure pipeline 320. Furthermore, the second high-pressure pipeline 320 is connected to the second heat exchanger 120, and the second high-pressure pipeline 320 heats the refrigerant pipeline 100 through the second heat exchanger 120.
[0059] Specifically, during the process of the high-pressure refrigerant passing through the second high-pressure pipeline 320, it needs to pass through the second heat exchanger 120, so that the high-pressure refrigerant can exchange heat with the refrigerant in the refrigerant pipeline 100 through the second heat exchanger 120, thereby achieving heating of the refrigerant pipeline 100.
[0060] For example, the second high-pressure pipeline 320 is connected to the high-temperature heat exchange tube in the second heat exchanger 120. In this way, when the high-pressure refrigerant in the second compression system 300 enters the second heat exchanger 120 along the second high-pressure pipeline 320, the high-pressure refrigerant in the second compression system 300 exchanges heat with the refrigerant in the refrigerant pipeline 100 through the second heat exchanger 120, thereby achieving heating of the refrigerant pipeline 100.
[0061] In the above embodiments, the high-pressure refrigerant in the second compression system 300 can flow not only along the second high-pressure pipeline 320 to the second low-pressure pipeline 310, but also along the third high-pressure pipeline 380 to the second low-pressure pipeline 310. Specifically, the flow rate of the high-pressure refrigerant in the second compression system 300 within the second high-pressure pipeline 320 and the third high-pressure pipeline 380 can be adjusted to regulate the refrigerant's operating state.
[0062] For example, when the refrigeration device is cooling the target object, the high-pressure refrigerant in the second compression system 300 flows along the third high-pressure line 380 to the second low-pressure line 310, meaning that the high-pressure refrigerant in the second compression system 300 does not pass through the second heat exchanger 120. Therefore, the refrigerant in the refrigerant line 100 is not heated by the high-pressure refrigerant in the second compression system 300 during its flow through the second heat exchanger 120.
[0063] When the target object reaches the set temperature, the high-pressure refrigerant in the second compression system 300 flows along the second high-pressure pipeline 320 to the second low-pressure pipeline 310, meaning the high-pressure refrigerant in the second compression system 300 passes through the second heat exchanger 120. Therefore, the refrigerant in the refrigerant pipeline 100 is heated by the high-pressure refrigerant in the second compression system 300 as it flows through the second heat exchanger 120, so that the temperature of the refrigerant pipeline 100 is approximately equal to the set temperature, thereby maintaining the temperature of the target object at the set temperature.
[0064] In the above embodiments, both the first compression system 200 and the second compression system 300 remain operational during the cooling process of the target object and during the process of maintaining the target object's temperature. Therefore, frequent start-ups and shutdowns of the first compression system 200 and the second compression system 300 can be avoided. Thus, the cooling device provided in the above embodiments is beneficial for extending the service life of the first compression system 200 and the second compression system 300. Furthermore, the cooling device provided in this embodiment does not require additional energy consumption during the process of maintaining the target object's temperature, thereby reducing the energy consumption of the cooling device.
[0065] In some optional embodiments, the second high-pressure line 320 is provided with a first valve 321, which is used to adjust the flow rate of the second high-pressure line 320 to adjust the heat transferred from the high-pressure refrigerant in the second high-pressure line 320 to the refrigerant line 100, thereby helping to adjust the temperature of the refrigerant in the refrigerant line 100.
[0066] In some further optional embodiments, the third high-pressure line 380 is provided with a second valve 381, which is used to regulate the flow rate of the third high-pressure line 380, thereby blocking the passage of high-pressure refrigerant from the third high-pressure line 380.
[0067] In some optional embodiments, during the cooling process of the refrigeration device cooling the target object, the first valve 321 can be closed and the second valve 381 can be opened so that the high-pressure refrigerant in the second compression system 300 flows into the second low-pressure pipeline 310 through the third high-pressure pipeline 380, so as to avoid the high-pressure refrigerant in the second compression system 300 heating the refrigerant pipeline 100.
[0068] In some optional embodiments, while the refrigeration device is maintaining the target temperature, the first valve 321 can be opened and the second valve 381 closed, so that the high-pressure refrigerant in the second compression system 300 flows into the second low-pressure line 310 through the second high-pressure line 320, thereby allowing the high-pressure refrigerant in the second compression system 300 to heat the refrigerant line 100. In this way, the refrigeration device can maintain the first compression system 200 and the second compression system 300 in operation while maintaining the target temperature, without needing to shut down either system. Therefore, this embodiment avoids the impact of frequently opening and closing the first compression system 200 and the second compression system 300 on the refrigeration device, which is beneficial to extending the service life of the refrigeration device.
[0069] In some further optional embodiments, when the temperature of the target object reaches the set temperature, both the first valve 321 and the second valve 381 can be opened. By adjusting the opening values of the first valve 321 and the second valve 381, the heat exchange between the high-pressure refrigerant in the second compression system 300 and the refrigerant pipeline 100 can be adjusted, thereby regulating the temperature of the refrigerant pipeline 100. Therefore, this embodiment is beneficial to improving the temperature control capability of the refrigeration device.
[0070] For example, the greater the difference between the set temperature of the target object and the minimum cooling temperature output by the refrigeration device, the larger the opening of the first valve 321 and the smaller the opening of the second valve 381. Conversely, the smaller the difference between the set temperature of the target object and the minimum cooling temperature output by the refrigeration device, the smaller the opening of the first valve 321 and the larger the opening of the second valve 381.
[0071] In some alternative embodiments, such as Figure 3 As shown, the first high-pressure line 210 includes a fourth sub-line 211 and a fifth sub-line 212. The fifth sub-line 212 is connected in parallel with the fourth sub-line 211. The refrigerant line 100 also includes a sixth heat exchanger 170. Optionally, the fifth sub-line 212 is connected to the sixth heat exchanger 170 so that the high-pressure refrigerant in the first compression system 200 can heat the refrigerant line 100 through the sixth heat exchanger 170.
[0072] Specifically, when the refrigeration device cools the target object, the high-pressure refrigerant in the first compression system 200 flows through the fourth sub-circuit 211 and, after depressurization, directly enters the first low-pressure pipeline 230. When the refrigeration device maintains a certain set temperature, the high-pressure refrigerant in the first compression system 200 can flow through the fifth sub-circuit 212 through the sixth heat exchanger 170, so that the high-pressure refrigerant in the first compression system 200 can heat the refrigerant pipeline 100, thereby maintaining the temperature of the refrigerant pipeline 100 at approximately the set temperature. In an optional embodiment, both the fourth sub-circuit 211 and the fifth sub-circuit 212 are equipped with valves that can adjust the refrigerant flow rate, so that the flow rate in the fourth sub-circuit 211 and the fifth sub-circuit 212 can be controlled by regulating the valves.
[0073] In some alternative embodiments, the second compression system 300 further includes a first check valve 330 disposed in the second high-pressure line 320. Thus, the first check valve 330 prevents backflow of the high-pressure refrigerant within the second high-pressure line 320.
[0074] In some further optional embodiments, the first check valve 330 is located downstream of the second heat exchanger 120 in the second high-pressure line 320. Further optionally, the first valve 321 is located in the upstream manifold of the second heat exchanger 120. Specifically, when the first valve 321 is open, the high-pressure refrigerant enters the second heat exchanger 120 through the first valve 321. The high-pressure refrigerant passing through the second heat exchanger 120 flows through the first check valve 330 and then to the second low-pressure line 310.
[0075] It should be noted that the high-pressure refrigerant in the second high-pressure pipeline 320 experiences a temperature decrease after passing through the second heat exchanger 120. Therefore, the pressure of the refrigerant decreases after passing through the second heat exchanger 120. In the above embodiment, the first one-way valve 330 can prevent the refrigerant in the downstream manifold of the first one-way valve 330 from flowing back along the second high-pressure pipeline 320.
[0076] In some alternative embodiments, the fifth sub-channel 212 is provided with a check valve, and the check valve is located downstream of the sixth heat exchanger 170 in the fifth sub-channel 212.
[0077] In some alternative embodiments, such as Figures 1 to 3The second compression system 300 further includes a first compressor 340 and a first pressure relief device 350. The medium inlet of the first compressor 340 and the medium outlet of the first pressure relief device 350 are connected through a second low-pressure pipeline 310; the medium outlet of the first compressor 340 and the medium inlet of the first pressure relief device 350 are connected through a second high-pressure pipeline 320 and a third high-pressure pipeline 380. In some optional embodiments, the first pressure relief device 350 can be a thermostatic expansion valve. In a further optional embodiment, the opening of the thermostatic expansion valve can be adjusted according to the vapor temperature of the refrigerant after evaporation in the second low-pressure pipeline 310 within the third heat exchanger 220 to ensure the stability of the pressure in the second low-pressure pipeline 310. This is beneficial to ensuring the stability of the evaporation temperature of the refrigerant in the second low-pressure pipeline 310 within the third heat exchanger 220.
[0078] For example, the low-pressure refrigerant in the second compression system 300 enters the first compressor 340 through the medium inlet. The high-pressure refrigerant, compressed by the first compressor 340, is discharged from the medium outlet of the first compressor 340. The high-pressure refrigerant discharged from the first compressor 340 flows along the second high-pressure line 320 and / or the third high-pressure line 380 to the first pressure relief device 350, thereby releasing the pressure of the high-pressure refrigerant within the second compression system 300. After passing through the first pressure relief device 350, it enters the second low-pressure line 310 and then enters the first compressor 340 along the second low-pressure line 310. Therefore, the refrigeration equipment provided above can achieve refrigerant circulation and recirculation in the second compression system 300.
[0079] Reference Figures 1 to 3 In some optional embodiments, the second compression system 300 includes a fourth high-pressure line 390. A first end of the fourth high-pressure line 390 is connected to the medium inlet of the first pressure relief device 350, and a second end of the fourth high-pressure line 390 is connected to both the second high-pressure line 320 and the third high-pressure line 380. Exemplarily, the high-pressure refrigerant discharged from the first compressor 340 can enter the fourth high-pressure line 390 via the second high-pressure line 320, flow along the fourth high-pressure line 390 to the first pressure relief device 350, and after being depressurized by the first pressure relief device 350, enter the second low-pressure line 310. Alternatively, the high-pressure refrigerant discharged from the first compressor 340 can also enter the fourth high-pressure line 390 via the third high-pressure line 380, flow along the fourth high-pressure line 390 to the first pressure relief device 350, and after being depressurized by the first pressure relief device 350, enter the second low-pressure line 310.
[0080] In some alternative embodiments, refer to Figures 1 to 3The refrigeration device also includes a cooling pipe 400. The second compression system 300 also includes a fourth heat exchanger 360, which is disposed in the fourth high-pressure pipe 390. The cooling pipe 400 is connected to the fourth heat exchanger 360, and the cooling pipe 400 cools the fourth high-pressure pipe 390 through the fourth heat exchanger 360.
[0081] For example, the cooling pipe 400 can be a water-cooled manifold. In some alternative embodiments, the temperature of the water in the cooling pipe 400 can be 10°C.
[0082] In the above embodiment, the cooling pipe 400 can condense the high-pressure refrigerant in the fourth high-pressure pipe 390 into a liquid state through the fourth heat exchanger 360. After the liquid high-pressure refrigerant enters the second low-pressure pipe 310, its pressure is released. The refrigerant, after pressure release, vaporizes in the third heat exchanger 220. Therefore, this embodiment is beneficial in increasing the heat absorbed by the vaporization of the refrigerant medium in the second low-pressure pipe 310, thereby improving the cooling capacity of the refrigeration device.
[0083] Furthermore, in the above embodiment, the fourth heat exchanger 360 is disposed on the fourth high-pressure pipeline 390, meaning that both the second high-pressure pipeline 320 and the third high-pressure pipeline 380 are located upstream of the fourth heat exchanger 360. Therefore, this embodiment also helps to increase the heat of the refrigerant in the second heat exchanger 120, thereby improving the heating capacity of the second high-pressure pipeline 320 for the refrigerant pipeline 100.
[0084] In some alternative embodiments, the first compression system 200 further includes a fifth heat exchanger 240 disposed in the first high-pressure pipeline 210, and a cooling pipeline 400 connected to the fifth heat exchanger 240, wherein the cooling pipeline 400 cools the first high-pressure pipeline 210 through the fifth heat exchanger 240.
[0085] In the above embodiments, the cooling pipe 400 can cool the high-pressure refrigerant in the first high-pressure pipe 210 through the fifth heat exchanger 240, thereby helping to reduce the heat of the high-pressure refrigerant in the first high-pressure pipe 210. In some further optional embodiments, the fifth heat exchanger 240 is located upstream of the third heat exchanger 220, so that the refrigerant discharged from the fifth heat exchanger 240 can further enter the third heat exchanger 220, thereby allowing the refrigerant in the first high-pressure pipe 210 to be further cooled by the refrigerant in the second low-pressure pipe 310.
[0086] Reference Figure 1In some optional embodiments, the refrigeration device further includes an oil separator 280. In an optional embodiment, the oil separator 280 is disposed on the first high-pressure line 210 to separate the oil discharged from the first high-pressure line 210 from the refrigerant. In a further optional embodiment, the oil separator 280 is disposed upstream of the fifth heat exchanger 240 and the third heat exchanger 220.
[0087] Specifically, during the operation of the compressor, the lubricating oil inside the compressor is easily discharged along with the refrigerant. In the above embodiment, by providing an oil separator 280, it is beneficial to prevent the lubricating oil from liquefying and adhering to the valves of the first compression system 200.
[0088] In some alternative embodiments, such as Figures 1 to 3 As shown, the bottom of the oil separator 280 is also connected to the second compressor 250 via a conduit so that the lubricating oil discharged from the medium outlet of the second compressor 250 can return to the second compressor 250.
[0089] Reference Figures 1 to 3 In some optional embodiments, the first compression system 200 further includes a second compressor 250 and a second pressure relief device 260. The medium inlet of the second compressor 250 and the medium outlet of the second pressure relief device 260 are connected via a first low-pressure line 230. The medium outlet of the second compressor 250 and the medium inlet of the second pressure relief device 260 are connected via a first high-pressure line 210. Optionally, the second pressure relief device 260 may be a capillary tube.
[0090] The refrigerant in the first compression system 200 enters the second compressor 250 through the medium inlet and is compressed within the second compressor 250. The pressurized refrigerant is discharged from the medium outlet of the second compressor 250. The refrigerant discharged from the second compressor 250 enters the first high-pressure line 210 and flows through the first high-pressure line 210 to the second pressure relief device 260. The refrigerant flowing through the second pressure relief device 260 is depressurized and enters the first low-pressure line 230, then enters the second compressor 250 through the medium inlet along the first low-pressure line 230.
[0091] In the above embodiment, the second compressor 250, the first high-pressure pipeline 210, the second pressure relief device 260, and the first low-pressure pipeline 230 form a closed loop, thereby enabling the circulation of refrigerant within the first compression system 200. Furthermore, the second pressure relief device 260 helps improve the pressure stability within the first low-pressure pipeline 230 and facilitates the evaporation of the refrigerant medium within the first low-pressure pipeline 230 within the first heat exchanger 110, thus achieving cooling of the refrigerant pipeline 100.
[0092] In some alternative implementations, such as Figures 1 to 3 As shown, the first high-pressure pipeline 210 is equipped with a second check valve 270 to prevent the refrigerant in the first high-pressure pipeline 210 from flowing back.
[0093] In some further optional embodiments, refer to Figure 1 The first compression system 200 also includes a first gas-liquid separator 290. Specifically, the first gas-liquid separator 290 is disposed in the first low-pressure pipeline 230. Optionally, the first gas-liquid separator 290 is located downstream of the first heat exchanger 110. Thus, gas or liquid passing through the first heat exchanger 110 can enter the first gas-liquid separator 290 along the first low-pressure pipeline 230 to separate the unevaporated liquid refrigerant from the evaporated gaseous refrigerant in the first low-pressure pipeline 230. Exemplarily, the separated gaseous refrigerant can enter the second compressor 250 through the first low-pressure pipeline 230 for pressurization. In an optional embodiment, the liquid refrigerant can be temporarily stored in the first gas-liquid separator 290.
[0094] In the above embodiments, the first gas-liquid separation device 290 is beneficial in preventing liquid refrigerant from entering the second compressor 250, avoiding a sharp increase in the flow rate of the refrigerant in the second compressor 250, reducing the load on the second compressor 250, and preventing the second compressor 250 from being damaged due to excessive operating load.
[0095] Reference Figures 1 to 3 In some optional embodiments, the second compression system 300 further includes a second gas-liquid separator 370. The second gas-liquid separator 370 is disposed in the second low-pressure line 310. Further optionally, the second gas-liquid separator 370 is located downstream of the third heat exchanger 220. Thus, the refrigerant that has not been evaporated after passing through the third heat exchanger 220 and the evaporated gaseous refrigerant can be separated within the second gas-liquid separator 370, preventing liquid refrigerant from entering the first compressor 340. Therefore, the second gas-liquid separator 370 helps prevent liquid refrigerant from entering the first compressor 340, avoids a sharp increase in the refrigerant flow rate in the first compressor 340, and helps reduce the load on the first compressor 340, preventing damage due to excessive operating load.
[0096] In some alternative embodiments, the refrigerant line 100 further includes a circulation pump 140 to drive the flow of refrigerant in the refrigerant line 100. (Refer to...) Figure 1 In some alternative embodiments, the refrigerant line 100 is a closed circulation line, so that the refrigerant can be driven to circulate within the refrigerant line 100 by the circulation pump 140.
[0097] In some optional embodiments, the refrigerant line 100 also includes a heater 130. Exemplarily, the heater 130 can be used to heat the refrigerant line 100. One use case for the heater 130 is when the heat generated by the second heat exchanger 120 and the sixth heat exchanger 170 is insufficient to maintain the temperature of the refrigerant line 100 at a substantially constant set temperature; in this case, the heater 130 can be activated to maintain the temperature of the refrigerant line 100 at the set temperature. This improves the temperature control capability of the refrigeration unit.
[0098] In some alternative embodiments, such as Figures 1 to 3 The heater 130, circulating pump 140, first heat exchanger 110, and second heat exchanger 120 are connected in series via pipelines. In this way, the refrigerant in the refrigerant pipeline 100, driven by the circulating pump 140, can pass evenly through the heater 130, first heat exchanger 110, and second heat exchanger 120. Furthermore, the temperature of the refrigerant in the refrigerant pipeline 100 can be controlled by controlling the heater 130, first heat exchanger 110, and / or second heat exchanger 120. This allows for temperature control while the first compression system 200 and second compression system 300 are running continuously, avoiding frequent start-ups and shutdowns of the first compression system 200 and second compression system 300, and thus improving the service life of the refrigeration equipment.
[0099] In some optional embodiments, the refrigerant line 100 also includes a buffer tank 160. Specifically, during the cooling process of the refrigerant line 100, temperature changes can cause the volume of refrigerant within the refrigerant line 100 to increase or decrease. In the above embodiments, when the volume of refrigerant in the refrigerant line 100 increases, a portion of the refrigerant can be stored in the buffer tank 160. When the volume of refrigerant in the refrigerant line 100 decreases, a portion of the refrigerant in the buffer tank 160 can enter the refrigerant line 100, which helps to maintain a constant pressure within the refrigerant line 100.
[0100] On the other hand, this application also provides a freeze-thaw machine. Exemplarily, this freeze-thaw machine has the same technical features as the refrigeration equipment shown in the above embodiments and can achieve the same technical effects, which will not be described in detail here.
[0101] In some alternative embodiments, the freeze-thaw machine also includes a freeze-thaw chamber 150. Optionally, the freeze-thaw chamber 150 can be used to provide placement or storage space for the target object.
[0102] For example, the freeze-thaw chamber 150 is connected to the refrigerant line 100 in the refrigeration unit. In this way, the internal space of the freeze-thaw chamber 150 can be cooled through the refrigerant line 100.
[0103] like Figures 1 to 3As shown, in some optional embodiments, the freeze-thaw chamber 150 is connected in series with the circulation pump 140, the first heat exchanger 110, and the second heat exchanger 120 via pipelines. In this way, the refrigerant passing through the freeze-thaw chamber 150 can flow through the first heat exchanger 110 and the second heat exchanger 120 under the drive of the circulation pump 140, thereby continuously providing cooling capacity to the freeze-thaw chamber 150.
[0104] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.
Claims
1. A refrigeration apparatus for refrigerating a target object, characterized by comprising: The refrigeration equipment includes refrigerant piping, a first compression system, and a second compression system; The refrigerant pipeline is used to cool the target object, and the refrigerant pipeline includes a first heat exchanger and a second heat exchanger; The first compression system includes a first high-pressure pipeline, a third heat exchanger disposed on the first high-pressure pipeline, and a first low-pressure pipeline connected to the first high-pressure pipeline. The first low-pressure pipeline is connected to the first heat exchanger, and the first low-pressure pipeline cools the refrigerant pipeline through the first heat exchanger. The second compression system includes a second low-pressure pipeline, a second high-pressure pipeline, and a third high-pressure pipeline connected to the third heat exchanger. The second high-pressure pipeline and the third high-pressure pipeline are both connected to the second low-pressure pipeline, and the third high-pressure pipeline is connected in parallel with the second high-pressure pipeline. Furthermore, the second high-pressure pipeline is connected to the second heat exchanger, and the second high-pressure pipeline heats the refrigerant pipeline through the second heat exchanger.
2. The refrigeration appliance of claim 1, wherein, The second high-pressure pipeline is equipped with a first valve, which is used to regulate the flow rate of the second high-pressure pipeline; and / or, The third high-pressure pipeline is equipped with a second valve, which is used to regulate the flow rate of the third high-pressure pipeline.
3. The refrigeration appliance of claim 2, wherein, The second compression system also includes a first check valve, which is disposed in the second high-pressure pipeline.
4. The refrigeration appliance of any of claims 1-3, wherein, The second compression system further includes a first compressor and a first pressure relief device. The medium inlet of the first compressor and the medium outlet of the first pressure relief device are connected through a second low-pressure pipeline. The medium outlet of the first compressor and the medium inlet of the first pressure relief device are connected through a second high-pressure pipeline and a third high-pressure pipeline.
5. The refrigeration appliance of claim 4, wherein, The second compression system further includes a fourth high-pressure pipeline, the first end of which is connected to the medium inlet of the first pressure relief device, and the second end of which is connected to the second high-pressure pipeline and the third high-pressure pipeline, respectively.
6. The refrigeration appliance of claim 5, wherein, It also includes cooling pipes, The second compression system further includes a fourth heat exchanger, which is disposed in the fourth high-pressure pipeline. The cooling pipeline is connected to the fourth heat exchanger, and the cooling pipeline cools the fourth high-pressure pipeline through the fourth heat exchanger.
7. The refrigeration appliance of claim 6, wherein, The first compression system further includes a fifth heat exchanger, which is disposed in the first high-pressure pipeline. The cooling pipeline is connected to the fifth heat exchanger, and the cooling pipeline cools the first high-pressure pipeline through the fifth heat exchanger.
8. The refrigeration equipment according to any one of claims 1 to 3, characterized in that, The first compression system also includes a second compressor and a second pressure relief device. The medium inlet of the second compressor and the medium outlet of the second pressure relief device are connected through the first low-pressure pipeline; The medium outlet of the second compressor and the medium inlet of the second pressure relief device are connected through the first high-pressure pipeline.
9. The refrigeration equipment according to any one of claims 1 to 3, characterized in that, It also includes a circulating pump, which, the first heat exchanger, and the second heat exchanger are connected in series via pipelines.
10. A freeze-thaw machine, characterized in that, The device includes a freeze-thaw chamber, a heater, and a refrigeration device as described in any one of claims 1 to 9, wherein the freeze-thaw chamber and the heater are both disposed in the refrigerant pipeline, wherein the heater is used to heat the refrigerant pipeline, and the freeze-thaw chamber is used to provide a placement space for the target object.