Double-evaporator and refrigerating system and refrigerating equipment thereof
By installing a liquid receiver at the outlet of the first evaporator and adjusting the length of the capillary tube, the problem of uneven refrigerant distribution was solved, achieving the best cooling effect and system stability for the freezer and refrigerator compartments in the dual evaporator refrigeration system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DA PAN ELECTRIC APPLIANCE IND CO LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-04-21
AI Technical Summary
In existing dual-evaporator refrigeration systems, uneven refrigerant distribution prevents the freezer or refrigerator compartments from achieving optimal cooling performance simultaneously, and can easily lead to excessively cold return pipes that frost over.
A liquid receiver is installed at the outlet of the first evaporator to temporarily store excess refrigerant. The amount of refrigerant is adjusted in combination with the difference in capillary tube length to ensure that the refrigerant evaporation in each evaporator is balanced.
It achieves optimal cooling performance in both the freezer and refrigerator compartments, while preventing the return pipe from becoming too cold and frosting, thus improving the stability and efficiency of the refrigeration system.
Smart Images
Figure CN224151190U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of refrigeration technology, and in particular to a dual evaporator, its refrigeration system, and refrigeration equipment. Background Technology
[0002] Common household refrigerators, car freezers, and other refrigeration equipment typically have an ultra-low temperature freezer compartment and a low temperature refrigerator compartment. The refrigeration equipment is equipped with a dual evaporator refrigeration system, with one evaporator used for the freezer compartment and the other for the refrigerator compartment, so that the freezer compartment and the refrigerator compartment can work independently without interfering with each other.
[0003] Because the two evaporators share a single compressor, the refrigeration system can only be designed with refrigerant based on the cooling capacity of either the freezer or the refrigerator compartment. This has the following drawbacks: If the refrigerant is designed for the freezer compartment with its high cooling demand, it can ensure that the refrigerant evaporates sufficiently in the freezer compartment's evaporator to achieve the expected cooling effect. However, for the refrigerator compartment, which has a relatively lower cooling demand, excessive refrigerant entering the refrigerator compartment's evaporator can easily lead to overcooling and frosting of the return pipe. Conversely, if the refrigerant is designed for the refrigerator compartment with its relatively lower cooling demand, although it can ensure that the refrigerant evaporates sufficiently in the refrigerator compartment's evaporator to achieve the expected cooling effect and avoid overcooling and frosting of the return pipe, the limited amount of refrigerant in the freezer compartment's evaporator cannot meet the optimal cooling effect of the freezer compartment.
[0004] Therefore, how to structurally improve the dual-evaporator refrigeration system so that the refrigerant can fully evaporate in both evaporators to obtain the best cooling effect is one of the technical problems that engineers urgently need to solve. Utility Model Content
[0005] This invention proposes a dual evaporator and its refrigeration system and equipment. By setting a liquid receiver at the outlet end of the first evaporator to balance the refrigerant, it ensures that both the first and second evaporators can obtain better refrigeration effects without causing the return pipe to become too cold and frost.
[0006] This utility model discloses a dual evaporator, including a first evaporator 61 for installation in a first temperature zone, a first capillary tube 51 connected to the inlet end of the first evaporator 61, a second evaporator 62 for installation in a second temperature zone, a second capillary tube 52 connected to the inlet end of the second evaporator 62, and a return gas pipe 9 for connecting the outlet ends of the first evaporator 61 and the outlet ends of the second evaporator 62. The first capillary tube 51 and the second capillary tube 52 are partially wound around the return gas pipe 9. A liquid reservoir 7 is provided at the outlet end of the first evaporator 61. The first evaporator 61 is connected to the return gas pipe 9 through the liquid reservoir 7, and the liquid reservoir 7 is vertically arranged.
[0007] In some preferred embodiments, the length of the first capillary 51 is greater than the length of the second capillary 52.
[0008] In some preferred embodiments, the first capillary 51 has an outer diameter of 1.8 mm, an inner diameter of 0.6 mm, and a length of 2250 mm; the second capillary 52 has an outer diameter of 1.8 mm, an inner diameter of 0.6 mm, and a length of 1950 mm.
[0009] In some preferred embodiments, the evaporation area of the first evaporator 61 is smaller than that of the second evaporator 62; both the first evaporator 61 and the second evaporator 62 are tubular evaporators or plate evaporators.
[0010] In some preferred embodiments, both the first evaporator 61 and the second evaporator 62 are tubular evaporators and are arranged in a square.
[0011] In some preferred embodiments, the inner side of the second evaporator 62 is also provided with a cold guide plate 621, and the evaporation tube of the second evaporator 62 is fixed to the cold guide plate 621.
[0012] This utility model also discloses a dual-evaporator refrigeration system, including a compressor 1, a solenoid valve 4, and a condenser 2 connected between the exhaust port of the compressor 1 and the inlet pipe of the solenoid valve 4, and also including the dual evaporators; wherein, the first capillary tube 51 is connected to the first output pipe of the solenoid valve 4, the second capillary tube 52 is connected to the second output pipe of the solenoid valve 4, and the return pipe 9 is connected to the suction port of the compressor 1.
[0013] In some preferred embodiments, the return gas pipe 9 is connected to the outlet end of the liquid reservoir 7 and the second evaporator 62 via a three-way pipe 8.
[0014] In some preferred embodiments, a dryer filter 3 is connected in series between the condenser 2 and the inlet pipe of the solenoid valve 4.
[0015] This utility model also discloses a refrigeration device, characterized in that it employs the aforementioned dual evaporator refrigeration system.
[0016] Compared with the prior art, the present invention has the following beneficial effects:
[0017] This invention, while ensuring that the refrigerant evaporates sufficiently in the second evaporator to achieve the expected cooling effect, adds a liquid receiver at the outlet end of the first evaporator. When the solenoid valve is selected to connect the first output pipe, the liquid receiver can temporarily store excess refrigerant entering the first evaporator, thereby regulating the amount of refrigerant evaporating in the first evaporator. This prevents excessive refrigerant from participating in the evaporation of the first evaporator and avoids the return of excessive refrigerant to the compressor via the return pipe, which would cause the return pipe to become too cold and frosty, thus affecting the return of refrigerant to the compressor. Attached Figure Description
[0018] Figure 1 This is a schematic diagram illustrating the working principle of a dual-evaporator refrigeration system.
[0019] Figure 2 This is a schematic diagram of one embodiment of a dual evaporator.
[0020] Figure 3 This is a schematic diagram of another embodiment of a dual evaporator. Detailed Implementation
[0021] To further illustrate the technical means and effects adopted by this application to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.
[0022] like Figure 1 and Figure 2 As shown, the dual-evaporator refrigeration system disclosed in this utility model includes a compressor 1, a solenoid valve 4, a condenser 2 connected between the exhaust port of the compressor 1 and the inlet pipe of the solenoid valve 4, and dual evaporators. Specifically, the dual evaporators include a first evaporator 61 installed in a first temperature zone, a first capillary tube 51 connected to the inlet end of the first evaporator 61, a second evaporator 62 installed in a second temperature zone, a second capillary tube 52 connected to the inlet end of the second evaporator 62, and a return gas pipe 9 connecting the outlet ends of both the first evaporator 61 and the second evaporator 62. Both the first capillary tube 51 and the second capillary tube 52 are partially wound around the return gas pipe 9. A liquid receiver 7 is provided at the outlet end of the first evaporator 61, and the first evaporator 61 is connected to the return gas pipe 9 through the liquid receiver 7, which is vertically positioned.
[0023] Specifically, the dual-evaporator refrigeration system includes a compressor 1, a solenoid valve 4, a condenser 2 connected between the exhaust port of the compressor 1 and the inlet pipe of the solenoid valve 4, a first capillary tube 51 connected to the first output pipe A of the solenoid valve 4, a first evaporator 61 connected to the first capillary tube 51, a second capillary tube 52 connected to the second output pipe B of the solenoid valve 4, a second evaporator 62 connected to the second capillary tube 52, and a return pipe 9 for connecting the ends of the first evaporator 61 and the second evaporator 62 to the suction port of the compressor 1. A liquid receiver 7 is provided between the return pipe 9 and the end of the first evaporator 61, and the return pipe 9 is connected to the end of the first evaporator 61 through the liquid receiver 7. Both the first capillary tube 51 and the second capillary tube 52 are partially wound around the return pipe 9.
[0024] For example, the first capillary tube 51 has a first winding section 511 wound around the return pipe 9, and the second capillary tube 52 has a second winding section 521 wound around the return pipe 9. By partially winding the first capillary tube 51 and the second capillary tube 52 around the lower-temperature return pipe 9, it is beneficial to keep the refrigerant in the first capillary tube 51 and the second capillary tube 52 at a lower temperature, and to prevent the refrigerant from vaporizing prematurely before entering the first evaporator 61 and the second evaporator 62.
[0025] The liquid receiver 7 is a container with an inner diameter larger than the inner diameter of the evaporation tube of the first evaporator 61. The liquid receiver 7 is installed vertically, with one end connected to the end of the first evaporator 61 and the other end connected to the return gas pipe 9.
[0026] For ease of connection, the return gas pipe 9 is connected to the liquid storage tank 7 and the end of the second evaporator 62 via a three-way pipe 8.
[0027] Furthermore, a dryer filter 3 is connected in series between the condenser 2 and the inlet pipe of the solenoid valve 4. The dryer filter 3 absorbs moisture in the refrigerant and filters impurities to prevent ice blockage in the piping of the refrigeration system.
[0028] The first evaporator 61 has a smaller evaporation area and is installed in a first temperature zone, such as a refrigerator compartment or a cold storage area; the second evaporator 62 has a larger evaporation area and is installed in a second temperature zone, such as a freezer compartment or a freezer area.
[0029] Solenoid valve 4 is a two-position three-way solenoid valve with a one-inlet and two-outlet pipeline design. The inlet pipe of solenoid valve 4 is connected to condenser 2. The first output pipe A and the second output pipe B of solenoid valve 4 are connected to the first capillary tube 51 and the second capillary tube 52, respectively. Solenoid valve 2 selects to connect the inlet pipe of solenoid valve 4 to one of the first output pipe A and the second output pipe B according to the preset control conditions.
[0030] When compressor 1 starts, the refrigerant will pass through condenser 2, solenoid valve 4, and first capillary tube 51 in sequence to enter the first evaporator 61, which will provide cooling for the refrigerator compartment. Alternatively, the refrigerant will pass through solenoid valve 4 and second capillary tube 52 to enter the second evaporator 62, which will provide cooling for the freezer compartment. The refrigerant returning from the first evaporator 61 or the second evaporator 62 will be drawn back to compressor 1 through return pipe 9.
[0031] As is well known to those skilled in the art, solenoid valve 4 is responsible for precise temperature control in a refrigeration system, achieving temperature regulation in different temperature zones by switching the refrigerant flow or shutting it off. Therefore, the core function of solenoid valve 4 is to switch the refrigerant flow or shut off the refrigerant, thereby achieving precise temperature control of the refrigerator compartment and freezer compartment.
[0032] This invention allows for the design of the required refrigerant quantity within the refrigeration system based on the second evaporator 62, which has a larger evaporation capacity. By using the solenoid valve 4 to selectively connect the second output pipe B, allowing the refrigerant to enter the second evaporator 62 through the second capillary tube 52, it ensures that the refrigerant evaporates sufficiently within the second evaporator 62 to achieve the desired optimal cooling effect. When the solenoid valve 4 selectively connects the first output pipe A, allowing the refrigerant to enter the first evaporator 61 through the first capillary tube 51, excess refrigerant will enter the liquid receiver 7 and be temporarily stored there. This ensures that the appropriate amount of refrigerant remaining in the first evaporator 61 can also evaporate sufficiently within the first evaporator 61 to achieve the desired optimal cooling effect.
[0033] Therefore, by adding a liquid receiver 7 at the outlet end of the first evaporator 61, when the solenoid valve 3 selects to connect the first output pipe A, the liquid receiver 7 can temporarily store the excess refrigerant entering the first evaporator 61, thereby regulating the amount of refrigerant evaporated in the first evaporator 61. This can prevent excessive refrigerant from participating in the evaporation of the first evaporator 61 and flowing back to the compressor 1 through the return pipe 9, which would cause the return pipe 9 to become too cold and frosty, thus affecting the refrigerant's return to the compressor 1.
[0034] To further improve the refrigerant rebalancing capability based on the liquid receiver 7, the first capillary tube 51 and the second capillary tube 52 are designed with different lengths: Since the evaporation area of the first evaporator 61 is small, the length of the first capillary tube 51 is relatively short. For example, the first capillary tube 51 is designed with dimensions of 1.8 mm (outer diameter) * 0.6 mm (inner diameter) * 2250 mm (length), resulting in a pressure ratio of 7:5.2 between the two ends of the first capillary tube 51 (i.e., the pressure of refrigerant entering the first capillary tube 51: the pressure of refrigerant flowing out of the first capillary tube 51 = 7:5.2). The second evaporator 62 has a relatively large evaporation area, so the length of the second capillary tube 52 is greater than the length of the first capillary tube 51. For example, the dimensions of the second capillary tube 52 are 1.8 mm (outer diameter) * 0.6 mm (inner diameter) * 1950 mm (length), resulting in a pressure ratio of 7:5.4 between the two ends of the second capillary tube.
[0035] Since the amount of refrigerant entering the capillary tube is inversely proportional to the length of the capillary tube, the first capillary tube 51 is set to be longer, so that the amount of refrigerant entering the first capillary tube 51 is relatively less; the second capillary tube 52 is set to be shorter, so that when the solenoid valve 2 is used for selection, the amount of refrigerant entering the second capillary tube 52 will also be relatively more.
[0036] Therefore, by setting the first capillary tube 51 to a shorter length, the amount of refrigerant entering the first capillary tube 51 can be reduced, thus preventing excessive refrigerant from entering the first evaporator 61. The amount of refrigerant in the first evaporator 61 can then be adjusted by the liquid receiver 7. By utilizing the appropriate length of the first capillary tube 51 and the liquid receiver 7 in coordination, a better refrigerant balance can be achieved, ensuring that there is no excessive refrigerant evaporating in the first evaporator 61 and causing the return pipe 9 to become overcooled and frosted when it flows through the return pipe 9.
[0037] The shape of the first evaporator 61 and the second evaporator 62 is not limited; they can be tubular evaporators or plate evaporators. Figure 2 , Figure 3 The diagram shows tubular evaporators arranged in a square pattern to contact and connect with the outer sides of the refrigerator compartment and the freezer compartment, respectively. The first evaporator 61 and the second evaporator 62 provide efficient cooling to the refrigerator compartment and the freezer compartment, respectively.
[0038] Additionally, see Figure 3 In the embodiment shown, the inner side of the second evaporator 62 is also provided with a cold guide plate 621. The evaporation tube of the second evaporator 62 is fixed to the cold guide plate 621. The second evaporator 62 is connected to the outer periphery of the freezer chamber through the cold guide plate 621. The cold guide plate 621 helps to improve the uniformity of cooling of the second evaporator 62 to various positions in the freezer chamber.
[0039] This utility model also discloses a refrigeration device that uses the aforementioned refrigeration system. Specifically, the refrigeration device can be a household refrigerator, a vehicle freezer, a refrigerator, or other refrigeration equipment. It typically has a freezer compartment with an ultra-low temperature zone and a refrigerator compartment with a low temperature zone. The refrigeration device is equipped with a dual-evaporator refrigeration system, wherein the first evaporator 61 is used for the refrigerator compartment, and the second evaporator 62 is used for the freezer compartment. Both the freezer compartment and the refrigerator compartment can obtain better refrigeration effects, and the return pipe 9 is less prone to overcooling and frosting.
[0040] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A dual evaporator, comprising a first evaporator (61) for installation in a first temperature zone, a first capillary tube (51) connected to the inlet end of the first evaporator (61), a second evaporator (62) for installation in a second temperature zone, a second capillary tube (52) connected to the inlet end of the second evaporator (62), and a return gas pipe (9) for connecting the outlet ends of the first evaporator (61) and the second evaporator (62), wherein the first capillary tube (51) and the second capillary tube (52) are both partially wound around the return gas pipe (9); characterized in that, A liquid receiver (7) is provided at the outlet end of the first evaporator (61). The first evaporator (61) is connected to the return gas pipe (9) through the liquid receiver (7), and the liquid receiver (7) is set vertically.
2. The dual evaporator of claim 1, wherein, The length of the first capillary (51) is greater than the length of the second capillary (52).
3. The dual evaporator of claim 1, wherein, The first capillary (51) has an outer diameter of 1.8 mm, an inner diameter of 0.6 mm, and a length of 2250 mm; the second capillary (52) has an outer diameter of 1.8 mm, an inner diameter of 0.6 mm, and a length of 1950 mm.
4. The dual evaporator of claim 1, wherein, The evaporation area of the first evaporator (61) is smaller than that of the second evaporator (62); both the first evaporator (61) and the second evaporator (62) are tubular evaporators or plate evaporators.
5. The dual evaporator of claim 1, wherein, Both the first evaporator (61) and the second evaporator (62) are tubular evaporators and are arranged in a square shape.
6. The dual evaporator of claim 5, wherein, The inner side of the second evaporator (62) is also provided with a cold guide plate (621), and the evaporation tube of the second evaporator (62) is fixed to the cold guide plate (621).
7. A refrigeration system of double evaporator type comprising a compressor (1), a solenoid valve (4) and a condenser (2) connected between the discharge of the compressor (1) and the inlet pipe of the solenoid valve (4), characterized in that, It also includes a dual evaporator as described in any one of claims 1-6; The first capillary tube (51) is connected to the first output tube of the solenoid valve (4), the second capillary tube (52) is connected to the second output tube of the solenoid valve (4), and the return pipe (9) is connected to the suction port of the compressor (1).
8. The refrigeration system of claim 7, wherein, The return gas pipe (9) is connected to the outlet end of the liquid storage tank (7) and the second evaporator (62) via the three-way pipe (8).
9. The refrigeration system of claim 7, wherein, A dryer filter (3) is connected in series between the condenser (2) and the inlet pipe of the solenoid valve (4).
10. A refrigeration appliance characterized in that, The dual evaporator refrigeration system described in any one of claims 7 to 9 is adopted.