Refrigerating circuit and refrigerator
The parallel capillary tube assembly and control valve design solves the problem of the capillary tube being unable to adjust the throttling, and achieves efficient cooling and energy-saving operation of the refrigerator under different ambient temperatures.
Patent Information
- Application Number
- CN202421712698.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-07-18
AI Technical Summary
The capillary tube design of existing refrigerators cannot flexibly adjust the degree of throttling, resulting in poor cooling effect or excessive energy consumption. In particular, it is difficult to match the cooling capacity requirements of the refrigeration and freezer compartments when the ambient temperature changes.
The parallel capillary tube assembly and control valve design are used to adjust the refrigerant flow path through the parallel capillary tube assembly and control valve, matching the refrigerant flow and pressure drop, and realizing independent control and energy-saving optimization of the refrigeration and freezer compartments.
It improves the refrigeration effect, reduces energy loss, improves the overall energy efficiency of the refrigerator, and adapts to different ambient temperatures and load changes.
Smart Images
Figure CN223319311U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to a refrigeration device, and more particularly, to a refrigeration circuit and a refrigerator. Background Art
[0002] With economic development, various types of refrigerators have entered thousands of households and become an indispensable part of people's daily life. While satisfying people's need to store food, they also consume a lot of electricity. With the proposal of the country's dual carbon tasks, energy consumption upgrades are imminent. Energy conservation and emission reduction of refrigerators have become a core issue, which is more prominent for those refrigerators with multiple systems, large capacity and high energy consumption.
[0003] As a key component in a refrigerator's refrigeration circuit, the capillary tube plays a throttling and pressure-reducing role. Its small internal pore size and defined length create flow resistance for the refrigerant, throttling it from high pressure to low pressure. This crucial step in the refrigeration cycle ensures optimal evaporation and heat absorption in the evaporator. Capillary tube performance directly impacts the refrigerator's cooling efficiency. If the capillary tube is too long or too short, it can lead to poor cooling performance or system instability. Utility Model Content
[0004] The present application provides a refrigeration circuit and a refrigerator, which can achieve the purpose of energy saving and consumption reduction.
[0005] Specifically, this application is implemented through the following technical solutions:
[0006] One aspect of the present application provides a refrigeration circuit for transporting a refrigerant, comprising
[0007] Refrigerated evaporator;
[0008] Refrigerated evaporator;
[0009] The first branch comprises a first capillary tube assembly, the refrigeration evaporator and the freezing evaporator connected in series in sequence, wherein the first capillary tube assembly comprises at least two capillaries connected in parallel, and the two capillaries connected in parallel are connected to the air inlet of the refrigeration evaporator.
[0010] Optionally, the refrigeration circuit also includes a second branch, the second branch is connected in series with the refrigeration evaporator and a second capillary tube assembly, the second capillary tube assembly includes at least two capillaries connected in parallel, and the two capillaries connected in parallel are connected to the air inlet of the refrigeration evaporator.
[0011] Optionally, the first branch is further connected in series with a first control valve; the first capillary tube assembly includes capillary tube I and capillary tube II, and the first control valve is used to control the refrigerant to flow through the capillary tube I and / or capillary tube II.
[0012] Optionally, the second branch is further connected in series with a second control valve; the second capillary tube assembly includes capillary tube III and capillary tube IV, and the second control valve is used to control the refrigerant to flow through the capillary tube III and / or capillary tube IV.
[0013] Optionally, the refrigeration circuit further includes a third control valve, the first branch and the second branch are connected in parallel, and the third control valve is used to control the refrigerant to flow through the first branch or the second branch.
[0014] Optionally, the first control valve includes two first passages, and the first control valve is used to switch the refrigerant to flow through any one of the first passages, or to flow through the two first passages at the same time; the structure of the second control valve is consistent with that of the first control valve.
[0015] Optionally, the third control valve includes two second passages, and the third control valve is used to switch the refrigerant to flow through any one of the two second passages.
[0016] Optionally, the diameter of the capillary tube I is greater than or equal to the diameter of the capillary tube II, and the diameter of the capillary tube III is greater than or equal to the diameter of the capillary tube IV; and / or
[0017] The length of the capillary I is greater than or equal to the length of the capillary II, and the length of the capillary III is greater than or equal to the length of the capillary IV.
[0018] Another aspect of the present application provides a refrigerator comprising the refrigeration circuit according to any one of the above claims.
[0019] Optionally, the refrigerator also includes a controller and a temperature sensor, the temperature sensor is used to detect the ambient temperature and send a temperature signal, the controller is electrically connected to the temperature sensor and the first control valve and the second control valve respectively, and the controller is used to control the flow path of the first control valve and the second control valve according to the temperature signal.
[0020] The present application provides a refrigeration circuit and refrigerator, comprising at least two capillary tubes connected in parallel. When refrigerant is introduced into the refrigeration circuit, the refrigerant flows through the first capillary tube assembly, then enters the refrigeration evaporator, and then enters the freezing evaporator. The refrigerant passing through the first capillary tube assembly can flow through at least two capillary tubes connected in parallel within the first capillary tube assembly, so that the flow rate of the refrigerant in each capillary tube is reduced accordingly, thereby reducing the refrigerant pressure drop loss. When the ambient temperature is high, the compressor of the refrigeration circuit runs faster, resulting in a large flow rate of the refrigerant. The greater the flow rate of the refrigerant flowing through the capillary tube, the greater the pressure drop, which exceeds the throttling effect required by the evaporator. If the throttling is too high, a pressure drop loss will occur, which may cause the refrigeration effect of the refrigeration circuit to decrease, and have a large energy loss. The first capillary tube assembly of the present application includes at least two capillary tubes connected in parallel, which can reduce the flow rate and thus reduce the pressure drop effect, thereby improving the refrigeration effect and reducing energy loss. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic diagram of a refrigeration circuit in the prior art;
[0022] Figure 2 is a schematic diagram of a refrigeration circuit shown in an exemplary embodiment of the present application;
[0023] Figure 3 is a partial schematic diagram of a refrigeration circuit shown in an exemplary embodiment of the present application;
[0024] Figure 4 is a schematic diagram of a first branch shown in an exemplary embodiment of the present application;
[0025] Figure 5 This is a schematic diagram of the second branch shown in an exemplary embodiment of the present application. DETAILED DESCRIPTION
[0026] Here, the technical solutions in the embodiments (or “implementation methods”) of the present application will be described clearly and completely with reference to the accompanying drawings.
[0027] Please refer to Figure 1 Currently, capillary tubes serve as the primary throttling device in refrigerators. They connect the refrigeration evaporator 100 and the freezing evaporator 200 via a single capillary tube, and the degree of throttling is unadjustable. As ambient temperature changes, the heat load varies significantly, and the required cooling capacity and throttling degree also vary.
[0028] The terms "first" and "second" in the embodiments of this application are only used for the purpose of convenience of description and should not be understood as indicating or implying relative importance. Figure 2 、 Figure 3 as well as Figure 4The present application provides a refrigeration circuit, including a refrigeration evaporator 100, a freezing evaporator 200, and a first branch A1. The first branch A1 connects the first capillary tube assembly 300, the refrigeration evaporator 100, and the freezing evaporator 200 in series in sequence. The first branch A1 is the flow path of the refrigerant when releasing cold air to the refrigerated chamber. The first capillary tube assembly 300 is connected to the air inlet of the refrigeration evaporator 100. The first capillary tube assembly 300 includes at least two capillaries connected in parallel. In other words, three or four capillaries connected in parallel can also form the first capillary tube assembly 300. The two capillaries connected in parallel are connected to the air inlet of the refrigeration evaporator 100. When the refrigerant is introduced into the refrigeration circuit, the flow path of the refrigerant is to first pass through the first capillary tube assembly 300, then enter the refrigeration evaporator 100, and then enter the freezing evaporator 200. The refrigerant passing through the first capillary tube assembly 300 can flow through at least two capillary tubes connected in parallel in the first capillary tube assembly 300 , so that the flow rate of the refrigerant in each capillary tube is reduced accordingly, thereby reducing the refrigerant pressure drop loss.
[0029] For example, when the ambient temperature is high, in order to maintain the temperature of the refrigerator, the heat load of the refrigeration circuit is large, and the compressor of the refrigeration circuit runs faster, resulting in a high refrigerant flow rate. The greater the refrigerant flow rate flowing through the capillary tube, the greater the pressure drop, exceeding the throttling effect required by the evaporator. Excessive throttling results in pressure drop loss, which may lead to a decrease in the cooling effect of the refrigeration circuit and a large energy loss. The first capillary tube assembly 300 of the present application includes at least two capillary tubes connected in parallel, which can reduce the flow rate and thus the pressure drop effect, thereby improving the cooling effect and reducing energy loss.
[0030] In the present application, the refrigeration evaporator 100 and the freezing evaporator 200 are connected in series. The refrigeration evaporator 100 is used to provide cold air to the refrigerator's refrigerator compartment, and the freezing evaporator 200 is used to provide cold air to the refrigerator's freezer compartment. Since the amount of cold required for refrigeration and freezing is very different, when filling the refrigerant, it is necessary to fill it according to the maximum required amount of cold air. When only the refrigerator compartment needs to be cooled, the refrigerant passes through the refrigeration evaporator 100 to cool the refrigerator compartment. Since the amount of cold air required for the refrigerator compartment is less than the amount of cold air that the refrigerant can produce, there will be excess cold air flowing out of the refrigeration evaporator 100. If it is directly transported back to the compressor 500 through the return air pipe, liquid hammer will occur, and the cold air of the refrigerant will not be reasonably utilized. In the present application, the excess cold air flowing out of the refrigeration evaporator 100 can be stored around the freezing evaporator 200 after passing through the freezing evaporator 200. When the freezer compartment needs to be cooled, this part of the cold air can be used to reduce the loss caused by the unreasonable use of cold air.
[0031] In one embodiment, please combine Figure 2 、 Figure 3 as well as Figure 5The refrigeration circuit also includes a second branch A2, which is connected in series with the freezer evaporator 200 and a second capillary tube assembly 400. The second capillary tube assembly 400 is connected to the air inlet of the freezer evaporator 200 and includes two capillary tubes connected in parallel. The two capillary tubes are in communication with the air inlet of the freezer evaporator 200. The second branch A2 is the flow path of the refrigerant when the refrigeration circuit cools the freezer compartment. In this embodiment, the second capillary tube assembly 400 is similar to the first capillary tube assembly 300. The second capillary tube assembly 400 includes two interconnected capillary tubes, which can reduce the flow rate of the refrigerant and reduce the pressure drop of the refrigerator flowing to the freezer evaporator 200.
[0032] In one embodiment, combining Figure 3 First branch A1 is also connected in series with a first control valve 310. The first capillary tube assembly 300 includes capillary tube I 301 and capillary tube II 302. First control valve 310 is used to control the flow of refrigerant through capillary tube I 301 and / or capillary tube II 302. In other words, refrigerant flowing through the first capillary tube assembly 300 can be controlled by first control valve 310 to flow only through capillary tube I 301, only through capillary tube II 302, or through both capillary tubes I 301 and II 302 in parallel. In this embodiment, when the refrigeration circuit is cooling a cold storage compartment, if the compressor runs at a high speed, thereby increasing the refrigerant flow rate in the refrigeration circuit, first control valve 310 can be used to control capillary tubes I 301 and II 302 in parallel to reduce pressure drop losses. When the compressor is operating at a normal speed, such as when the ambient temperature is low and the compressor heat load is low, the refrigerant can be controlled to flow through a single capillary tube I 301 or capillary tube II 302 to ensure cooling. The compressor operating speed is affected by many factors, such as high ambient temperature, high humidity, and the user leaving the refrigerator door open for extended periods. This embodiment controls first control valve 310 based on factors affecting the compressor, ensuring that the refrigerant pressure drop matches the compressor operating speed.
[0033] In one embodiment, combining Figure 3 , the second branch A1 is also connected in series with a second control valve 410, and the second capillary tube assembly 400 includes a capillary tube III 401 and a capillary tube IV 402. The second control valve 410 is used to control the refrigerant to flow through the capillary tube III 401 and / or the capillary tube IV 402. That is, when the refrigerant flows through the second capillary tube assembly 400, the second control valve 410 can control the refrigerant to flow only through the capillary tube III 401, or only through the capillary tube IV 402, or simultaneously through the capillary tube III 401 and the capillary tube IV 402 in parallel. When the refrigeration circuit of the present application cools the freezer, the second control valve 410 is similar to the first control valve 310. It can control the refrigerant to flow through a single capillary tube or two parallel capillaries according to the factors affecting the operation of the compressor, so that the pressure drop of the refrigerant matches the operating speed of the compressor.
[0034] In one embodiment, combining Figure 3 The refrigeration circuit also includes a third control valve A00. The first branch A1 and the second branch A2 are connected in parallel. The third control valve A00 is used to control the refrigerant to flow through the first branch A1 or the second branch A2. In other words, the third control valve A00 can control the refrigerant to flow only through the first branch A1 or only through the second branch A2. The refrigeration circuit cools the refrigerator compartment or the freezer compartment separately. At the same room temperature, the amount of cooling required to cool the refrigerator compartment or the freezer compartment is different. It is difficult to control the distribution of the refrigerant when cooling the refrigerator compartment or the freezer compartment at the same time. Therefore, in this embodiment, the third control valve A00 can control whether the refrigeration circuit cools the refrigerator compartment or the freezer compartment, accurately controlling the temperature of the refrigerator compartment or the freezer compartment.
[0035] In one embodiment, the first control valve 310 includes two first passages (not shown), forming two refrigerant passages within the first control valve 310. These two first passages are connected to capillary tube I 301 and capillary tube II 302 of the first capillary tube assembly 300, respectively. The first control valve 310 is used to switch refrigerant flow through either of the first passages or both. In other words, the first control valve 310 switches refrigerant flow through a single flow path or through both flow paths simultaneously. When selecting the first control valve 310, the above conditions must be considered to ensure that the first control valve 310 can control the first capillary tube assembly 300. The second control valve 410 is identical to the first control valve 310, specifically in structure. The second control valve 410 also has two passages, connected to capillary tube III 401 and capillary tube IV 402 of the second capillary tube assembly 400, respectively. This also ensures that the second control valve 410 can control the second capillary tube assembly 400.
[0036] In one embodiment, the third control valve A00 includes two second passages (not shown). The third control valve A00 is used to switch refrigerant flow through either of the two second passages. In other words, the third control valve A00 can control refrigerant flow through only a single passage. The two second passages of the third control valve A00 are connected to the first branch A1 and the second branch A2, respectively, enabling the third control valve A00 to switch between the first branch A1 and the second branch A2.
[0037] In one embodiment, the diameter of capillary tube I 301 is greater than or equal to the diameter of capillary tube II 302, and the diameter of capillary tube III 401 is greater than or equal to the diameter of capillary tube IV 402. In other words, within a capillary tube assembly, the diameter of any capillary tube can be greater than or equal to the diameter of another capillary tube. The diameters affect the flow rate within any capillary tube. The specific diameter setting requires experimental design based on the complex internal conditions of the refrigerator, such as the selection of two evaporators and the power of the compressor.
[0038] The length of capillary tube I 301 is greater than or equal to that of capillary tube II 302, and the length of capillary tube III 401 is greater than or equal to that of capillary tube IV 402. In other words, within a capillary tube assembly, the length of any capillary tube can be greater than or equal to that of another. Capillary tube length influences the degree of throttling. The specific length design also requires experimental design based on the complex internal conditions of the refrigerator, such as the choice of evaporator and the power of the compressor.
[0039] In one embodiment, the present application also includes a refrigerator, which is a variable frequency dual-system refrigerator and uses the variable flow refrigeration circuit provided by the present application that can adjust the capillary throttling effect. While ensuring the refrigeration effect, the refrigeration efficiency is improved to achieve the purpose of energy saving and consumption reduction.
[0040] In one embodiment, the refrigerator further includes a controller and a temperature sensor. The temperature sensor is configured to detect the ambient temperature and generate a temperature signal. The temperature sensor can be located externally of the refrigerator. The controller is electrically connected to the temperature sensor and the first and second control valves 310 and 410, respectively. The controller is configured to control the flow paths of the first and second control valves 310 and 410 based on the temperature signals. When the ambient temperature indicated by the temperature signal is high, the first and second control valves 310 and 410 can be controlled to operate in a dual-path configuration, thereby connecting the capillary tubes of the first and second capillary tube assemblies 300 and 400 in parallel. When the ambient temperature is low, the first and second control valves 310 and 410 can be controlled to operate in a single path, thereby allowing the refrigerant to flow through either capillary tube of the first or second capillary tube assemblies 300 and 400. Because high ambient temperatures cause the compressor 500 to operate at a high frequency, resulting in excessive refrigerant flow rates, this embodiment can control whether the capillary tubes are connected in parallel based on the temperature, thereby controlling the degree of throttling.
[0041] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.
Claims
1. A refrigeration circuit for transporting refrigerant, characterized in that: include Refrigerated evaporator; Refrigerated evaporator; The first branch comprises a first capillary tube assembly, the refrigeration evaporator and the freezing evaporator connected in series in sequence, wherein the first capillary tube assembly comprises at least two capillaries connected in parallel, and the two capillaries connected in parallel are connected to the air inlet of the refrigeration evaporator.
2. The refrigeration circuit according to claim 1, wherein: The refrigeration circuit also includes a second branch, which is connected in series with the refrigeration evaporator and a second capillary tube assembly. The second capillary tube assembly includes at least two capillaries connected in parallel. The two capillaries connected in parallel are connected to the air inlet of the refrigeration evaporator.
3. The refrigeration circuit according to claim 2, wherein: The first branch is further connected in series with a first control valve; the first capillary tube assembly includes capillary tube I and capillary tube II, and the first control valve is used to control the refrigerant to flow through the capillary tube I and / or capillary tube II.
4. The refrigeration circuit according to claim 3, wherein: The second branch is further connected in series with a second control valve; the second capillary tube assembly includes a capillary tube III and a capillary tube IV, and the second control valve is used to control the refrigerant to flow through the capillary tube III and / or capillary tube IV.
5. The refrigeration circuit according to any one of claims 2 to 4, characterized in that: The refrigeration circuit further includes a third control valve, the first branch and the second branch are connected in parallel, and the third control valve is used to control the refrigerant to flow through the first branch or the second branch.
6. The refrigeration circuit according to claim 4, wherein: The first control valve includes two first passages, and the first control valve is used to switch the refrigerant to flow through any one of the first passages, or to flow through the two first passages at the same time; the structure of the second control valve is consistent with that of the first control valve.
7. The refrigeration circuit according to claim 5, wherein: The third control valve includes two second passages, and the third control valve is used to switch the refrigerant to flow through any one of the two second passages.
8. The refrigeration circuit according to claim 4, wherein: The diameter of the capillary tube I is greater than or equal to the diameter of the capillary tube II, and the diameter of the capillary tube III is greater than or equal to the diameter of the capillary tube IV; and / or The length of the capillary I is greater than or equal to the length of the capillary II, and the length of the capillary III is greater than or equal to the length of the capillary IV.
9. A refrigerator, characterized in that: Comprising the refrigeration circuit according to any one of claims 1 to 8.
10. The refrigerator according to claim 9, wherein The refrigerator also includes a controller and a temperature sensor. The temperature sensor is used to detect the ambient temperature and send a temperature signal. The controller is electrically connected to the temperature sensor and the first control valve and the second control valve respectively. The controller is used to control the flow path of the first control valve and the second control valve according to the temperature signal.