Refrigerant runner structure of vehicle-mounted refrigerator
By designing a series-connected evaporator and bistable solenoid valve in the vehicle refrigerator to control the refrigerant flow path structure, the problem of poor refrigeration effect of the existing vehicle refrigerator is solved, and the minimum temperature is achieved within the set time and the front and rear sections are taken into account. Refrigeration speed.
Patent Information
- Application Number
- CN202420208461.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-29
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-01-29
AI Technical Summary
The existing car refrigerators have poor cooling effect during short trips, especially in high temperature environments, which leads to blind spots when storing foods. The reason is that the single-winding copper tube from top to bottom causes the evaporation pressure of the refrigerant to become higher. , the refrigeration chamber has not reached the minimum set temperature for a long time, and the low back pressure compressor cannot take into account the cooling speed of the front and rear stages.
Design a refrigerant flow channel structure of a vehicle-mounted refrigerator, including the first and second evaporators connected in series, and control the evaporation area and flow rate of the refrigerant flow through through a bistable solenoid valve, and use a large and a small interceptor to take into account the front and rear sections. Refrigeration speed ensures that the minimum set temperature is reached within the set time.
By independently controlling the evaporation area and flow rate of the refrigerant, the on-board refrigerator can achieve the minimum set temperature within the set time, solving the problem of both refrigeration layering and speed.
Smart Images
Figure CN222298227U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vehicle-mounted refrigerators, and in particular to a refrigerant flow channel structure of a vehicle-mounted refrigerator. Background Art
[0002] There are two main types of car refrigerators on the market. The first is a semiconductor car refrigerator, and the second is a compressor car refrigerator. Since the refrigeration effect of semiconductors is limited and not popular among consumers, most of the existing car refrigerators use compressors as the driving source.
[0003] For compressor car refrigerators, in order to prevent the overall temperature of the refrigeration chamber from being stratified, manufacturers are forced to use a single-wound copper tube from top to bottom as the evaporator (under normal circumstances, the single-wound copper tube should be set from bottom to top to obtain a lower evaporation pressure, but at the same time the temperature at the bottom will be lower, causing ice to form in the lower part of the refrigeration chamber and too high a temperature in the upper part). However, this type of car refrigerator does not have a good cooling effect when used on short trips. It is manifested as the failure to reach the lowest set temperature (-20°C) within 30 minutes after being turned on at room temperature, resulting in a blind spot time when food is stored, especially in a high temperature environment. The blind spot time will be longer. The reason is that the single-wound copper tube from top to bottom will increase the evaporation pressure of the refrigerant (the evaporation direction of the refrigerant is from bottom to top), causing the refrigeration chamber to fail to reach the lowest set temperature.
[0004] Furthermore, since car refrigerators need to freeze foods such as popsicles, they can only use low-back-pressure compressors. Low-back-pressure compressors refer to compressors with an operating evaporation temperature range of -35°C to -15°C. However, due to their own characteristics, low-back-pressure compressors cannot take into account the refrigeration speeds of the front and rear sections (normal temperature -0°C, 0°C-20°C). Generally, the refrigeration speed in the first half is fast, and the refrigeration speed in the second half is slow. Therefore, the single-winding copper tube and low-back-pressure compressor set from top to bottom together result in the car refrigerator being unable to reach the lowest set temperature within the set time. Utility Model Content
[0005] In view of the above problems, the utility model proposes a refrigerant flow channel structure of a vehicle refrigerator, which mainly solves the problems of the background technology.
[0006] In order to solve the above technical problems, the technical solution of the utility model is as follows:
[0007] A refrigerant flow channel structure for a vehicle refrigerator comprises a first interceptor and a first evaporator connected in sequence, and a second interceptor and a second evaporator connected in sequence, wherein the inlet ends of the first interceptor and the second interceptor are both connected to a bistable solenoid valve, and at any moment, the bistable solenoid valve only controls the first interceptor or the second interceptor to be turned on, the outlet end of the first evaporator is connected to the inlet end of the second evaporator, the outlet end of the second evaporator is connected to the inlet end of a compressor, and the refrigerant flow output of the first interceptor is less than the refrigerant flow output of the second interceptor.
[0008] In some embodiments, the first interceptor is an expansion valve or a capillary tube.
[0009] In some embodiments, the second interceptor is an expansion valve or a capillary tube.
[0010] In some embodiments, both the first flow cutoff and the second flow cutoff are capillaries, and the length of the first flow cutoff is greater than the length of the second flow cutoff.
[0011] In some embodiments, the first evaporator and the second evaporator are both single-wound copper tubes coiled from top to bottom.
[0012] In some embodiments, the first evaporator is installed on the outer wall of the refrigerating chamber of the vehicle refrigerator, and the second evaporator is installed on the outer wall of the freezing chamber of the vehicle refrigerator.
[0013] In some embodiments, the first evaporator and the second evaporator are both installed on the outer wall of a freezer compartment of a vehicle refrigerator.
[0014] The beneficial effects of the utility model are as follows: by setting a pair of first evaporator and second evaporator connected in series, and connecting the two ports of the bistable solenoid valve to the inlet ends of the first evaporator and the second evaporator respectively, the bistable solenoid valve can control the refrigerant to flow through the first evaporator and the second evaporator connected in series at any time, or to flow through the second evaporator alone, thereby autonomously controlling the evaporation area of the refrigerant, and at the same time utilizing the refrigerant flow output of the second interceptor, one large and one small, and the first interceptor, taking into account the front and rear refrigeration speeds, so that the vehicle refrigerator can reach the lowest set temperature within the set time. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the refrigerant flow channel structure of a vehicle refrigerator disclosed in an embodiment of the utility model;
[0016] Among them: 1-first interceptor, 2-first evaporator, 3-second interceptor, 4-second evaporator, 5-bistable solenoid valve. DETAILED DESCRIPTION
[0017] In order to make the purpose, technical solution and advantages of the utility model clearer and more specific, the content of the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings, rather than all the contents.
[0018] like Figure 1 As shown, this embodiment proposes a refrigerant flow channel structure of a vehicle refrigerator, including a first interceptor 1 and a first evaporator 2 connected in sequence, and a second interceptor 3 and a second evaporator 4 connected in sequence, wherein the inlet ends of the first interceptor 1 and the second interceptor 3 are both connected to a bistable solenoid valve 5, and at any time, the bistable solenoid valve 5 only controls the first interceptor 1 or the second interceptor 3 to be turned on, the outlet end of the first evaporator 2 is connected to the inlet end of the second evaporator 4, the outlet end of the second evaporator 4 is connected to the inlet end of the compressor, and the refrigerant flow output of the first interceptor 1 is less than the refrigerant flow output of the second interceptor 3.
[0019] In this embodiment, a pair of first evaporator 2 and second evaporator 4 are arranged in series, and the two ports of bistable solenoid valve 5 are respectively connected to the inlet ends of the first evaporator 2 and the second evaporator 4. The bistable solenoid valve 5 can control the refrigerant to flow through the first evaporator 2 and the second evaporator 4 in series at any time, or flow through the second evaporator 4 alone, so as to autonomously control the evaporation area of the refrigerant. At the same time, the second interceptor 3 and the first interceptor 1, which are large and small in refrigerant flow output, are used to take into account the front and rear refrigeration speeds, so that the vehicle refrigerator can reach the lowest set temperature within the set time.
[0020] Optionally, the first interceptor 1 and the second interceptor 3 are expansion valves or capillary tubes.
[0021] In one example, in order to save the overall cost of the system, both the first interceptor 1 and the second interceptor 3 are capillary tubes, and in order for the refrigerant output flow rate of the second interceptor 3 to be greater than the refrigerant output flow rate of the first interceptor 1 , the length of the first interceptor 1 should be greater than the length of the second interceptor 3 .
[0022] Specifically, after the vehicle refrigerator is turned on at room temperature, the bistable solenoid valve 5 conducts the second interceptor 3 and closes the first interceptor 1. Refrigeration and cooling in the range of room temperature to 0°C requires a large amount of refrigerant passing through, so a shorter second interceptor 3 is selected to increase the amount of refrigerant evaporation. When refrigeration and cooling are performed in the range of 0°C to -20°C, a lower evaporation pressure is required to achieve low-temperature rapid refrigeration. The bistable solenoid valve 5 conducts the first interceptor 1 and closes the second interceptor 3. A longer first interceptor 1 is selected. At the same time, the first evaporator 2 and the second evaporator 4 are in series, with a larger evaporation area and a lower evaporation pressure.
[0023] Obviously, while controlling the evaporation area of the evaporator, it is also necessary to control the input length of the capillary tube to obtain a reasonable refrigerant flow rate.
[0024] In this embodiment, the bistable solenoid valve 5 can control the series state of the two evaporators, thereby controlling the evaporation area of the evaporator. Therefore, the evaporator made of a single-wound copper tube will not have a particularly large impact on the refrigeration effect whether it is arranged from top to bottom or from bottom to top. In order to solve the problem of refrigeration stratification, the first evaporator 2 and the second evaporator 4 preferably select a single-wound copper tube wound from top to bottom.
[0025] The refrigerant flow channel structure of the vehicle refrigerator of this embodiment can be used in a conventional vehicle refrigerator including a refrigerating chamber and a freezing chamber, and can also be used in a vehicle refrigerator with a single freezing chamber.
[0026] For a vehicle refrigerator including a refrigerator compartment and a freezer compartment, the first evaporator 2 is installed on the outer wall of the refrigerator compartment of the vehicle refrigerator, and the second evaporator 4 is installed on the outer wall of the freezer compartment of the vehicle refrigerator. With this arrangement, after the second interceptor 3 is turned on, the first interceptor 1 is immediately turned off, and the refrigerator compartment is cooled within the range of normal temperature -0°C by the cold released by the second evaporator 4. When the refrigerator compartment drops to 0°C, the first interceptor 1 is turned on, and the second interceptor 3 is immediately turned off. At this time, the refrigerant will pass through the first evaporator 2 and the second evaporator 4 in turn, respectively, to cool the refrigerator compartment and the freezer compartment, until the freezer compartment reaches -20°C.
[0027] For a vehicle refrigerator that only includes a freezer compartment, the first evaporator 2 and the second evaporator 4 are both installed on the outer wall of the freezer compartment of the vehicle refrigerator. In this solution, unlike the above-mentioned vehicle refrigerator that includes a refrigerating compartment and a freezer compartment, the first evaporator 2 and the second evaporator 4 both provide cooling for the freezer compartment. Therefore, whether in the normal temperature range of -0°C or in the range of 0°C to -20°C, the refrigeration compartment will obtain the maximum cooling capacity.
[0028] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable ordinary technicians in the field to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the essence of the content of the utility model should be included in the protection scope of the utility model.
Claims
1. A refrigerant flow channel structure for a vehicle refrigerator, characterized in that: It includes a first interceptor and a first evaporator connected in sequence, and a second interceptor and a second evaporator connected in sequence, wherein the inlet ends of the first interceptor and the second interceptor are both connected to a bistable solenoid valve, and at any time, the bistable solenoid valve only controls the first interceptor or the second interceptor to be turned on, the outlet end of the first evaporator is connected to the inlet end of the second evaporator, the outlet end of the second evaporator is connected to the inlet end of the compressor, and the refrigerant flow output of the first interceptor is less than the refrigerant flow output of the second interceptor.
2. The refrigerant flow channel structure of the vehicle refrigerator according to claim 1, characterized in that: The first interceptor is an expansion valve or a capillary tube.
3. The refrigerant flow channel structure of the vehicle refrigerator according to claim 1, characterized in that: The second interceptor is an expansion valve or a capillary tube.
4. The refrigerant flow channel structure of the vehicle refrigerator according to claim 1, characterized in that: The first flow cutoff and the second flow cutoff are both capillaries, and the length of the first flow cutoff is greater than the length of the second flow cutoff.
5. The refrigerant flow channel structure of the vehicle refrigerator according to claim 1, characterized in that: The first evaporator and the second evaporator are both single-wound copper tubes wound from top to bottom.
6. The refrigerant flow channel structure of the vehicle refrigerator according to claim 1, characterized in that: The first evaporator is installed on the outer wall of the refrigerating chamber of the vehicle refrigerator, and the second evaporator is installed on the outer wall of the freezing chamber of the vehicle refrigerator.
7. The refrigerant flow channel structure of the vehicle refrigerator according to claim 1, characterized in that: The first evaporator and the second evaporator are both installed on the outer wall of the freezer compartment of the vehicle refrigerator.