Refrigerating system and refrigerator with same
By introducing a switching device and a check valve into the refrigerator's refrigeration system, combined with a parallel evaporator and a throttling device, the problem of insufficient refrigerant circulation was solved, thereby improving refrigeration efficiency and energy-saving performance, and enhancing the refrigerator's preservation effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-03-13
AI Technical Summary
Existing refrigerator refrigeration systems suffer from insufficient refrigerant circulation and low refrigeration efficiency, especially in dual-evaporator systems where the complex structure and lack of pressure differential for liquid refrigerant result in no improvement in refrigeration efficiency.
A switching device is used to switch the refrigerant to the low-temperature evaporator, a check valve is set to prevent abnormal liquefaction of the refrigerant in the high-temperature evaporator, and the pressure reduction is controlled by the first and second evaporators connected in parallel with the throttling device, thereby improving the evaporation temperature and refrigeration efficiency.
It effectively avoids insufficient refrigerant circulation, significantly improves refrigeration efficiency and energy-saving performance, improves humidity and temperature distribution in the refrigerator compartment, prevents freezing, and enhances preservation performance.
Smart Images
Figure CN223992358U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a refrigeration system and a refrigerator equipped with the same. Background Technology
[0002] As a refrigeration system for a refrigerator, one known refrigeration system includes a compressor, a condenser, a pressure reducing device, a three-way valve, a check valve, and a freezer compartment evaporator and a refrigerator compartment evaporator connected in parallel. The inlet of the freezer compartment evaporator is connected to the first outlet of the three-way valve, the inlet of the refrigerator compartment evaporator is connected to the second outlet of the three-way valve, the outlet of the refrigerator compartment evaporator is connected to one end of the check valve, and the other end of the check valve and the outlet of the freezer compartment evaporator are both connected to the inlet of the compressor. Another known refrigerator has a dual-evaporator refrigeration system, including a first refrigeration compartment, a second refrigeration compartment, a first refrigeration circuit, a second refrigeration circuit constituting the dual-evaporator refrigeration system, and a control system. During operation, the control system controls the refrigerant flow rate of the first and second refrigeration circuits, thereby controlling the evaporation temperature of the corresponding first and second evaporators, and thus realizing the switching between the refrigeration and freezing functions of the first or second refrigeration compartment.
[0003] However, in the aforementioned refrigeration system for refrigerators, the shut-off valve is located at the outlet of the high-temperature evaporator, which cannot prevent the gaseous refrigerant from liquefying in the low-temperature evaporator. This leads to insufficient refrigerant in the refrigerator compartment evaporator, resulting in lower refrigeration efficiency. Furthermore, in the aforementioned refrigerator with a dual-evaporator refrigeration system, a dual-system expansion valve is used for throttling. Based on the traditional series-parallel system, the refrigerant gas and liquid are separated at the outlet of the refrigerator compartment evaporator, with the liquid portion then throttled and evaporated through a freezing expansion valve. This structure is complex, and theoretically, due to the lack of pressure differential, the liquid refrigerant will not be throttled through the freezing expansion valve, thus failing to improve refrigeration efficiency. Utility Model Content
[0004] This utility model was made in view of the above-mentioned problems, and its purpose is to provide a refrigeration system and a refrigerator equipped with the same, which can effectively avoid insufficient refrigerant circulation and reliably improve refrigeration efficiency and energy-saving performance.
[0005] To achieve the above objectives, the refrigeration system of this utility model includes a compressor, a condenser, a first throttling device, a first evaporator, a second throttling device, a second evaporator, a switching device, and a check valve. The switching device switches the refrigerant to flow into either the first evaporator or the second evaporator. The evaporation temperature of the second evaporator is lower than that of the first evaporator. The outlet of the compressor is connected to the inlet of the condenser via a refrigeration pipe. The outlet of the condenser is connected to the inlet of the switching device via a refrigeration pipe. One outlet of the switching device is connected to the inlet of the first throttling device via a refrigeration pipe, and the other outlet is connected to the inlet of the second throttling device via a refrigeration pipe. The outlet of the first throttling device is connected to the inlet of the first evaporator via a refrigeration pipe. The outlet of the second throttling device is connected to the inlet of the second evaporator via a refrigeration pipe. The outlet of the first evaporator is connected to the inlet of the compressor via a refrigeration pipe and the check valve. The check valve is a valve that allows refrigerant to flow unidirectionally from the inlet to the outlet of the check valve. In this way, by installing a check valve at the outlet of the low-evaporation-temperature evaporator, i.e., the second evaporator, it is possible to prevent problems such as abnormal liquefaction of refrigerant vapor in the low-evaporation-temperature evaporator and insufficient refrigerant circulation in the high-evaporation-temperature evaporator when the first evaporator is continuously refrigerating. Moreover, by connecting the first and second evaporators in parallel and installing a switching device to switch the refrigerant flow to either the first or second evaporator, the first evaporator can be refrigerated independently, and its evaporation temperature can be increased. This can significantly improve the energy-saving performance of the refrigerator as a whole and increase the humidity in the refrigerator compartment corresponding to the first evaporator, thereby significantly improving the preservation performance. Furthermore, by increasing the evaporation temperature of the first evaporator, the air supply temperature of the corresponding compartment can be increased, which can improve the temperature distribution in the compartment. When the first evaporator is used in the refrigerator compartment, it can prevent freezing near the air vent when the area that cannot be directly blown by the air supply does not meet the standard. Furthermore, by connecting the first evaporator in series with the first throttling device, connecting the second evaporator in series with the second throttling device, and then connecting the series-connected refrigeration circuit in parallel, the pressure reduction of the first and second throttling devices can be set independently. This allows for a more reliable improvement in refrigeration efficiency and energy-saving performance. Consequently, insufficient refrigerant circulation can be effectively avoided, and refrigeration efficiency and energy-saving performance can be reliably improved.
[0006] Alternatively, in the refrigeration system described above, the switching device may be a three-way valve, with the inlet of the three-way valve connected to the outlet of the condenser via a refrigeration pipe, one outlet of the three-way valve connected to the inlet of the first throttling device via a refrigeration pipe, and the other outlet connected to the inlet of the second throttling device via a refrigeration pipe.
[0007] Alternatively, in the refrigeration system described above, the switching device may consist of a first shut-off valve that controls the flow of refrigerant to the first evaporator and a second shut-off valve that controls the flow of refrigerant to the second evaporator. The inlet of the first shut-off valve is connected to the outlet of the condenser via a refrigeration pipe, the inlet of the second shut-off valve is connected to the outlet of the condenser via a refrigeration pipe, the outlet of the first shut-off valve is connected to the inlet of the first throttling device via a refrigeration pipe, and the outlet of the second shut-off valve is connected to the inlet of the second throttling device via a refrigeration pipe.
[0008] Alternatively, in the refrigeration system described above, the compressor, condenser, switching device, first throttling device, first evaporator, second throttling device, second evaporator, and check valve can be connected to the refrigeration piping by brazing. In this way, by using brazing at the joints between the compressor, condenser, switching device, first throttling device, first evaporator, second throttling device, second evaporator, and check valve and the refrigeration piping, the compressor, condenser, switching device, first throttling device, first evaporator, second throttling device, second evaporator, and check valve can be reliably connected to the refrigeration piping.
[0009] Furthermore, in the refrigeration system described above, the refrigeration system may also include a drying tube disposed between the condenser and the switching device. The inlet of the drying tube is connected to the outlet of the condenser via a refrigeration pipe, and the outlet of the drying tube is connected to the inlet of the switching device via a refrigeration pipe. In this way, by providing a drying tube, icing at the throttling orifice can be prevented, thereby further and reliably improving refrigeration efficiency and energy-saving performance.
[0010] Alternatively, in the refrigeration system described above, the drying tube can be connected to the refrigeration pipe via brazing. This ensures a reliable connection between the drying tube and the refrigeration pipe.
[0011] Furthermore, in the refrigeration system described above, the pressure reduction of the first throttling device can be less than that of the second throttling device. In this way, by reducing the pressure reduction of the throttling structure of the first evaporator, the evaporation temperature of the refrigeration cycle of the first evaporator can be increased, thereby improving the refrigeration efficiency of the refrigeration cycle of the first evaporator and improving the humidity conditions in the compartment corresponding to the first evaporator. Thus, while reliably improving refrigeration efficiency and energy-saving performance, the preservation performance can be further enhanced.
[0012] Alternatively, in the refrigeration system described above, the first throttling device and the second throttling device may each be composed of capillary tubes.
[0013] The refrigerator involved in this utility model includes the above-mentioned refrigeration system.
[0014] According to this utility model, a refrigeration system and a refrigerator equipped with the same can be provided, which can effectively avoid insufficient refrigerant circulation and reliably improve refrigeration efficiency and energy-saving performance. Attached Figure Description
[0015] The above and other objects, features and advantages of this utility model will become clearer from the following detailed description taken in conjunction with the accompanying drawings, wherein:
[0016] Figure 1 This is a schematic diagram showing the general structure of the refrigeration system of the refrigerator according to the first embodiment.
[0017] Figure 2 This is a schematic diagram showing the general structure of the refrigeration system of the refrigerator according to the second embodiment. Detailed Implementation
[0018] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, identical or equivalent elements are marked with the same symbols, and repeated descriptions are omitted. Furthermore, positional relationships such as up, down, left, and right are not specifically described, but are based on the positional relationships shown in the drawings. Moreover, the scale of the drawings is not limited to the scale shown in the illustrations, except as used in the actual drawings.
[0019] Furthermore, it should be understood that the embodiments listed in this specification are merely illustrative and are not intended to limit the present invention to these embodiments. Rather, as those skilled in the art will understand, the present invention includes various alternatives, modifications, and equivalents.
[0020] In this specification, it should be understood that terms such as “comprising,” “including,” and “having” mean the presence of features, quantities, steps, operations, elements, components, or combinations thereof, but do not exclude the presence of one or more other features, quantities, steps, operations, elements, components, or combinations thereof.
[0021] (First Implementation)
[0022] The refrigerator (not shown) involved in this embodiment includes the following refrigeration system.
[0023] Figure 1 This is a schematic diagram showing the general structure of the refrigeration system of the refrigerator according to the first embodiment. For example... Figure 1As shown, the refrigeration system 1 involved in this embodiment includes a compressor A, a condenser B, a first throttling device E1, a first evaporator F, a second throttling device E2, a second evaporator G, a switching device, and a check valve H.
[0024] In this embodiment, as an example, the switching device consists of a three-way valve D, which switches the refrigerant flow to either the first evaporator F or the second evaporator G. That is, when the first evaporator F is cooling, the three-way valve D remains in the refrigeration circuit containing the first evaporator F; when the second evaporator G is cooling, the three-way valve D remains in the second refrigeration circuit containing the second evaporator G. Here, it is assumed that the evaporation temperature of the second evaporator G is lower than the evaporation temperature of the first evaporator F for explanation.
[0025] In addition, the first throttling device E1 is connected in series with the first evaporator F, and the second throttling device E2 is connected in series with the second evaporator G.
[0026] The connection structure of refrigeration system 1 is described below. The outlet of compressor A is connected to the inlet of condenser B via a refrigeration pipe. The outlet of condenser B is connected to the inlet of three-way valve D via a refrigeration pipe. One outlet of three-way valve D is connected to the inlet of first throttling device E1 via a refrigeration pipe, and the other outlet is connected to the inlet of second throttling device E2 via a refrigeration pipe. The outlet of first throttling device E1 is connected to the inlet of first evaporator F via a refrigeration pipe. The outlet of second throttling device E2 is connected to the inlet of second evaporator G via a refrigeration pipe. The outlet of first evaporator F is connected to the inlet of compressor A via a refrigeration pipe. The outlet of second evaporator G is connected to the inlet of compressor A via a refrigeration pipe and check valve H.
[0027] Check valve H is a valve that allows refrigerant to flow unidirectionally from its inlet to its outlet, and it is installed at the outlet of the second evaporator G. The flow direction of check valve H is configured so that refrigerant can flow from the second evaporator G to the compressor A, but not vice versa. That is, as... Figure 1 As shown, the flow direction of check valve H is as follows: h1→h2 is a closed circuit, and the opposite direction is a closed circuit.
[0028] In this embodiment, by installing a check valve at the outlet of the low-evaporation-temperature evaporator, i.e., the second evaporator, it is possible to prevent the refrigerant vapor from abnormally liquefying in the low-evaporation-temperature evaporator during long-term refrigeration, which would lead to insufficient refrigerant circulation in the high-evaporation-temperature evaporator. Furthermore, by connecting the first and second evaporators in parallel and installing a switching device that allows the refrigerant to flow to either the first or second evaporator, the first evaporator can be refrigerated independently, and its evaporation temperature can be increased. This significantly improves the energy-saving performance of the refrigerator as a whole and increases the humidity in the refrigerator compartment corresponding to the first evaporator, thereby significantly improving the preservation performance. In addition, by increasing the evaporation temperature of the first evaporator, the air supply temperature of the corresponding compartment can be increased, which can improve the temperature distribution in the compartment. When the first evaporator is used in the refrigerator compartment, it can prevent freezing near the air vent when the area that cannot be directly blown by the air supply does not meet the standard. Furthermore, by connecting the first evaporator in series with the first throttling device, connecting the second evaporator in series with the second throttling device, and then connecting the series-connected refrigeration circuit in parallel, the pressure reduction of the first and second throttling devices can be set independently. This allows for a more reliable improvement in refrigeration efficiency and energy-saving performance. Consequently, insufficient refrigerant circulation can be effectively avoided, and refrigeration efficiency and energy-saving performance can be reliably improved.
[0029] Furthermore, the refrigeration system 1 preferably also includes a drying pipe C disposed between the condenser B and the three-way valve D. The inlet of the drying pipe C is connected to the outlet of the condenser B via a refrigeration pipe, and the outlet of the drying pipe C is connected to the inlet of the three-way valve D via a refrigeration pipe. In this way, by providing a drying pipe, icing at the throttling orifice can be prevented, thereby further and reliably improving refrigeration efficiency and energy-saving performance.
[0030] In this embodiment, as described above, the first evaporator F is connected in series with the first throttling device E1, and the second evaporator G is connected in series with the second throttling device E2. These two series-connected components are then connected in parallel within the circulation system. By connecting the first evaporator and the first throttling device in series, and the second evaporator and the second throttling device in series, and then connecting the series-connected refrigeration circuit in parallel, the pressure reduction of each of the first and second throttling devices can be set independently. This further reliably improves refrigeration efficiency and energy-saving performance.
[0031] In this embodiment, the pressure reduction of the first throttling device E1 can also be configured to be less than that of the second throttling device E2. In this way, by reducing the pressure reduction of the throttling structure of the first evaporator, the evaporation temperature of the refrigeration cycle of the first evaporator can be increased, thereby improving the refrigeration efficiency of the refrigeration cycle of the first evaporator and improving the humidity conditions in the compartment corresponding to the first evaporator. Thus, while reliably improving refrigeration efficiency and energy-saving performance, the preservation performance can be further improved.
[0032] Furthermore, in this embodiment, the first throttling device E1 and the second throttling device E2 are preferably each composed of a capillary tube. This allows for the construction of each throttling device with a simple structure.
[0033] In this embodiment, compressor A, condenser B, dryer C, three-way valve D, first throttling device E1, second throttling device E2, first evaporator F, second evaporator G, and check valve H are connected to the refrigeration piping via brazing. Specifically, the first throttling device E1 and the first evaporator F are connected in series via refrigeration piping, with brazing at connection points e12 and f1. The second throttling device E2, the second evaporator G, and the check valve H are connected in series via refrigeration piping, with brazing at connection points e22, g1, g2, and h1. The two series-connected components are then connected in parallel within the system, as shown below. Figure 1 As shown, it is connected between the three-way valve D and the compressor A. Therefore, the compressor A, condenser B, dryer C, three-way valve D, first throttling device E1, second throttling device E2, first evaporator F, second evaporator G, and check valve H are connected to the refrigeration piping at the following locations: a1, a2, b1, b2, c1, c2, d1, d2, d3, e11, e12, e21, e22, f1, f2, g1, g2, h1, h2. Thus, by using brazing at the joints between the compressor, condenser, switching device, first throttling device, first evaporator, second throttling device, second evaporator, and check valve and the refrigeration piping, the compressor, condenser, switching device, first throttling device, first evaporator, second evaporator, second evaporator, and check valve can be reliably connected to the refrigeration piping. However, it is not limited to this. Compressor A, condenser B, dryer C, three-way valve D, first throttling device E1, second throttling device E2, first evaporator F, second evaporator G, and check valve H can also be connected to the refrigeration pipes by any method, such as bonding with adhesives or welding.
[0034] (Second Implementation)
[0035] Figure 2This is a schematic diagram showing the general structure of the refrigeration system of the refrigerator according to the second embodiment. The main difference between the refrigeration system 10 according to this embodiment and the refrigeration system 1 according to the first embodiment described above is that the switching device is composed of a first shut-off valve D1 and a second shut-off valve D2.
[0036] The first shut-off valve D1 controls the flow of refrigerant to the first evaporator F. The inlet of the first shut-off valve D1 is connected to the outlet of the dryer pipe C via a refrigeration pipe, and then to the outlet of the condenser B via the dryer pipe C. The outlet of the first shut-off valve D1 is connected to the inlet of the first throttling device E1 via a refrigeration pipe, and then to the inlet of the first evaporator F via the first throttling device E1. When the first shut-off valve D1 is open, refrigerant can flow to the first evaporator F; when the first shut-off valve D1 is closed, refrigerant cannot flow to the first evaporator F.
[0037] The second shut-off valve D2 controls the flow of refrigerant to the second evaporator G. The inlet of the second shut-off valve D2 is connected to the outlet of the dryer pipe C via a refrigeration pipe, and then to the outlet of the condenser B via the dryer pipe C. The outlet of the second shut-off valve D2 is connected to the inlet of the second throttling device E2 via a refrigeration pipe, and then to the inlet of the second evaporator G via the second throttling device E2. When the second shut-off valve D2 is open, refrigerant can flow to the second evaporator G; when the second shut-off valve D2 is closed, refrigerant cannot flow to the second evaporator G.
[0038] In addition, the connection points d11, d12, d21, and d22 between the first shut-off valve D1 and the second shut-off valve D2 and the refrigeration pipe are also brazed. However, this is not a limitation; the first shut-off valve D1 and the second shut-off valve D2 can also be connected to the refrigeration pipe by any method, such as joining with adhesive or welding.
[0039] According to this utility model, a refrigeration system and a refrigerator equipped with the same can be provided, which can effectively avoid insufficient refrigerant circulation and reliably improve refrigeration efficiency and energy-saving performance.
[0040] The embodiments of this utility model have been described above; however, this utility model is not limited to the embodiments described above. Those skilled in the art can make modifications and variations to this utility model as needed without departing from its essential spirit and scope. All such modifications and variations fall within the scope of this utility model.
[0041] For example, in the above embodiments, an example is given in which the refrigeration system also includes a drying tube C. However, it is not limited to this, and the refrigeration system may also exclude the drying tube C.
Claims
1. A refrigeration system characterized by comprising a compressor, a condenser, a first throttling device, a first evaporator, a second throttling device, a second evaporator, a switching device, and a check valve, the switching device switches refrigerant to flow to the first evaporator or to flow to the second evaporator, the evaporation temperature of the second evaporator is lower than the evaporation temperature of the first evaporator, the outlet of the compressor is connected to the inlet of the condenser via a refrigeration pipe, the outlet of the condenser is connected to the inlet of the switching device via a refrigeration pipe, one outlet of the switching device is connected to the inlet of the first throttling device via a refrigeration pipe, and the other outlet is connected to the inlet of the second throttling device via a refrigeration pipe, the outlet of the first throttling device is connected to the inlet of the first evaporator via a refrigeration pipe, the outlet of the second throttling device is connected to the inlet of the second evaporator via a refrigeration pipe, the outlet of the first evaporator is connected to the inlet of the compressor via a refrigeration pipe, the outlet of the second evaporator is connected to the inlet of the compressor via a refrigeration pipe and the check valve, the check valve is a valve that allows refrigerant to pass from the inlet of the check valve to the outlet of the check valve in one direction.
2. The refrigeration system according to claim 1, characterized in that the switching device is composed of a three-way valve, the inlet of the three-way valve is connected to the outlet of the condenser via a refrigeration pipe, one outlet of the three-way valve is connected to the inlet of the first throttling device via a refrigeration pipe, and the other outlet is connected to the inlet of the second throttling device via a refrigeration pipe.
3. The refrigeration system according to claim 1, characterized in that the switching device is composed of a first stop valve that controls the flow of refrigerant to the first evaporator and a second stop valve that controls the flow of refrigerant to the second evaporator, the inlet of the first stop valve is connected to the outlet of the condenser via a refrigeration pipe, and the inlet of the second stop valve is connected to the outlet of the condenser via a refrigeration pipe, the outlet of the first stop valve is connected to the inlet of the first throttling device via a refrigeration pipe, and the outlet of the second stop valve is connected to the inlet of the second throttling device via a refrigeration pipe.
4. The refrigeration system according to any one of claims 1 to 3, characterized in that the compressor, the condenser, the switching device, the first throttling device, the first evaporator, the second throttling device, the second evaporator, and the check valve are each connected to a refrigeration pipe by brazing.
5. The refrigeration system according to any one of claims 1 to 3, characterized in that the refrigeration system further comprises a drying pipe provided between the condenser and the switching device, the inlet of the drying pipe is connected to the outlet of the condenser via a refrigeration pipe, the outlet of the drying pipe is connected to the inlet of the switching device via a refrigeration pipe.
6. The refrigeration system according to claim 5, characterized in that the drying pipe is connected to a refrigeration pipe by brazing.
7. The refrigeration system according to any one of claims 1 to 3, characterized in that The first throttling device has a smaller pressure reduction amount than the second throttling device.
8. The refrigeration system according to any one of claims 1 to 3, wherein The first throttling device and the second throttling device are each formed of a capillary tube.
9. A refrigerator, comprising the refrigeration system according to any one of claims 1 to 8.
10. The refrigerator according to claim 9, wherein