A unit that utilizes multiple sets of check valves to regulate system flow direction

Abstract

The utility model discloses a kind of unit for adjusting system flow direction using multiple one-way valves, including evaporator, compressor, four-way valve, condenser and expansion valve, further including reservoir connected with the expansion valve, the inlet of the reservoir is provided with first inlet pipe and second inlet pipe respectively connected with third outlet pipe and first access pipe, first outlet pipe and second outlet pipe respectively connected with first access pipe and third outlet pipe are provided on the expansion valve;First inlet pipe, second inlet pipe, first outlet pipe and second outlet pipe are respectively provided with one-way valve.This application is by setting first inlet pipe, second inlet pipe, first outlet pipe and second outlet pipe, so that unit in refrigeration state or heating state, reservoir is set before expansion valve, excess refrigerant is left in reservoir, all into expansion valve are liquid, system operation is more stable, solve the technical defects existing in prior art.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration system technology, specifically to a unit that uses multiple sets of one-way valves to regulate the flow direction of the system. Background Technology

[0002] To improve system stability and increase low-temperature cooling capacity, refrigeration systems often add a receiver at the condenser outlet. In this case, the receiver is located at the high-pressure outlet. The refrigerant entering the expansion valve is in liquid form after passing through the receiver, resulting in stable throttling. As the temperature decreases, excess refrigerant is stored in the receiver. However, with changes in the system flow direction after switching to a four-way valve for defrosting or switching between cooling and heating modes, the receiver, now before the expansion valve, can become contaminated due to temperature changes. Liquid and gaseous refrigerant can enter the expansion valve at any time, causing instability in throttling due to air bubbles and affecting the unit's cooling capacity. Furthermore, because the receiver is at low pressure, a large amount of refrigerant can be carried into the evaporator, affecting the unit's cooling capacity. In some cases, it may even flow into the compressor, potentially causing secondary liquid slugging and damaging the compressor. Therefore, such systems are often either designed as single-function cooling or heating systems or use small receivers. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a unit that uses multiple sets of one-way valves to regulate the flow direction of the system.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a unit that uses multiple sets of one-way valves to regulate the flow direction of the system, including an evaporator, a compressor, a four-way valve, a condenser and an expansion valve, wherein the evaporator is provided with a first inlet pipe and a first outlet pipe, the compressor is provided with a second inlet pipe and a second outlet pipe, and the condenser is provided with a third inlet pipe and a third outlet pipe; It also includes a reservoir connected to the expansion valve, wherein the reservoir is provided with a first inlet pipe and a second inlet pipe that are respectively connected to the third outlet pipe and the first inlet pipe, and the expansion valve is provided with a first outlet pipe and a second outlet pipe that are respectively connected to the first inlet pipe and the third outlet pipe; One-way valves are respectively installed on the first inlet pipe, the second inlet pipe, the first outlet pipe, and the second outlet pipe.

[0005] Furthermore, in the cooling state, the one-way valves on the first inlet pipe and the first outlet pipe are open, and the one-way valves on the second inlet pipe and the second outlet pipe are closed; In heating mode, the one-way valves on the second inlet pipe and the second outlet pipe are open, while the one-way valves on the first inlet pipe and the first outlet pipe are closed.

[0006] Furthermore, the four-way valve is connected to the first outlet pipe, the third inlet pipe, the second inlet pipe, and the outlet pipe, respectively.

[0007] Furthermore, in the refrigeration state, the first outlet pipe is connected to the second inlet pipe through a four-way valve, and the second outlet pipe is connected to the third inlet pipe through a four-way valve. In heating mode, the third inlet pipe is connected to the second inlet pipe via a four-way valve, and the second outlet pipe is connected to the first outlet pipe via a four-way valve.

[0008] Compared with existing technologies, this application, by setting a first inlet pipe, a second inlet pipe, a first outlet pipe, and a second outlet pipe, ensures that the liquid receiver is positioned before the expansion valve when the unit is in cooling or heating mode. Excess refrigerant remains in the liquid receiver, and all refrigerant entering the expansion valve is liquid, resulting in more stable system operation and overcoming the technical defects of existing technologies. In addition, by setting one-way valves on the first inlet pipe, the second inlet pipe, the first outlet pipe, and the second outlet pipe, this application allows for easy switching between cooling and heating modes by changing the opening state of the one-way valves, and ensures that the liquid receiver is positioned before the expansion valve in both modes. Attached Figure Description

[0009] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 This is a schematic diagram of the flow direction in the cooling state according to an embodiment of the present invention.

[0010] Figure 2 This is a schematic diagram of the flow direction in the heating state according to an embodiment of the present invention.

[0011] In the diagram: 1. Evaporator; 2. Compressor; 3. Four-way valve; 4. Condenser; 5. Expansion valve; 6. Receiver; 61. First inlet pipe; 62. Second inlet pipe; 51. First outlet pipe; 52. Second outlet pipe; 11. First connecting pipe; 12. First outlet pipe; 21. Second connecting pipe; 22. Second outlet pipe; 7. Check valve; 41. Third connecting pipe; 42. Third outlet pipe. Detailed Implementation

[0012] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0013] Please see Figure 1-2 The present invention utilizes multiple sets of one-way valves 7 to regulate the flow direction of the system, including an evaporator 1, a compressor 2, a four-way valve 3, a condenser 4 and an expansion valve 5. The evaporator 1 is provided with a first inlet pipe 11 and a first outlet pipe 12, the compressor 2 is provided with a second inlet pipe 21 and a second outlet pipe 22, and the condenser 4 is provided with a third inlet pipe 41 and a third outlet pipe 42. It also includes a reservoir 6 connected to the expansion valve 5. The reservoir 6 has a first inlet pipe 61 and a second inlet pipe 62 that are respectively connected to the third outlet pipe 42 and the first inlet pipe 11. The expansion valve 5 has a first outlet pipe 51 and a second outlet pipe 52 that are respectively connected to the first inlet pipe 11 and the third outlet pipe 42. One-way valves 7 are respectively provided on the first inlet pipe 61, the second inlet pipe 62, the first outlet pipe 51 and the second outlet pipe 52.

[0014] By setting up a first inlet pipe 61, a second inlet pipe 62, a first outlet pipe 51, and a second outlet pipe 52, two sets of connecting pipes are provided. When switching between cooling and heating modes, the corresponding pipe connections are changed through a one-way valve 7. This ensures that in either cooling or heating mode, the refrigerant first passes through the liquid receiver 6 before entering the expansion valve 5. The liquid receiver 6 intercepts excess refrigerant, ensuring that all refrigerant entering the expansion valve 5 is liquid, thus making the system operation more stable.

[0015] In one embodiment, under cooling conditions, the one-way valve 7 on the first inlet pipe 61 and the first outlet pipe 51 is open, and the one-way valve 7 on the second inlet pipe 62 and the second outlet pipe 52 is closed. In heating mode, the one-way valve 7 on the second inlet pipe 62 and the second outlet pipe 52 is open, and the one-way valve 7 on the first inlet pipe 61 and the first outlet pipe 51 is closed.

[0016] In one embodiment, the four-way valve 3 is connected to the first outlet pipe 12, the third inlet pipe 41, the second inlet pipe 21, and the outlet pipe, respectively.

[0017] In one embodiment, under cooling conditions, the first outlet pipe 12 is connected to the second inlet pipe 21 via a four-way valve 3, and the second outlet pipe 22 is connected to the third inlet pipe 41 via a four-way valve 3. In heating mode, the third inlet pipe 41 is connected to the second inlet pipe 21 through a four-way valve 3, and the second outlet pipe 22 is connected to the first outlet pipe 12 through a four-way valve 3.

[0018] Working principle: In refrigeration mode, the one-way valves 7 on the first inlet pipe 61 and the first outlet pipe 51 are open, while the one-way valves 7 on the second inlet pipe 62 and the second outlet pipe 52 are closed. The refrigerant is compressed by the compressor 2 into a high-temperature, high-pressure refrigerant, which is then sent to the four-way valve 3 through the second outlet pipe 22. After that, it flows to the condenser 4 through the third inlet pipe 41, where it is condensed into a high-pressure liquid. It then flows to the receiver 6 through the third outlet pipe 42 and the first inlet pipe 61. After that, it enters the expansion valve 5, where it is throttled into a low-temperature, low-pressure liquid. It then flows into the evaporator 1 through the first outlet pipe 51 and the first inlet pipe 11 to evaporate into a low-pressure gaseous refrigerant. It then flows back to the four-way valve 3 through the first outlet pipe 12, and finally returns to the compressor 2 through the second inlet pipe 21 to complete the cycle. The receiver 6 is located before the expansion valve 5. During the low-temperature refrigeration process, excess refrigerant will form liquid refrigerant and be stored in the receiver 6. In heating mode, the one-way valves 7 on the first inlet pipe 61 and the first outlet pipe 51 are closed, while the one-way valves 7 on the second inlet pipe 62 and the second outlet pipe 52 are open. The refrigerant is compressed into a high-temperature, high-pressure refrigerant by the compressor 2 and sent to the four-way valve 3 through the second outlet pipe 22. At this time, the four-way valve 3 switches the flow direction, and the high-temperature, high-pressure refrigerant flows into the evaporator 1 (which is used as the condenser 4 at this time) through the four-way valve 3 and the first outlet pipe 12. It condenses into a high-pressure liquid in the evaporator 1 and flows to the liquid receiver 6 through the first inlet pipe 11 and the second inlet pipe 62. Then it enters the expansion valve 5 and is throttled into a low-pressure liquid. It flows into the condenser 4 (which is used as the evaporator 1 at this time) through the second outlet pipe 52 and the third outlet pipe 42, and then flows into the four-way valve 3. After that, it returns to the compressor 2 through the second inlet pipe 21 to complete the cycle. At this time, the liquid receiver 6 is still before the expansion valve 5. During the low-temperature heating process, excess refrigerant will form liquid refrigerant and be stored in the liquid receiver 6.

[0019] If the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Additionally, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0020] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A unit that uses multiple sets of one-way valves to regulate the flow direction of a system, comprising an evaporator (1), a compressor (2), a four-way valve (3), a condenser (4), and an expansion valve (5), wherein the evaporator (1) is provided with a first inlet pipe (11) and a first outlet pipe (12), the compressor (2) is provided with a second inlet pipe (21) and a second outlet pipe (22), and the condenser (4) is provided with a third inlet pipe (41) and a third outlet pipe (42), characterized in that: It also includes a reservoir (6) connected to the expansion valve (5), and the reservoir (6) is provided with a first inlet pipe (61) and a second inlet pipe (62) respectively connected to the third outlet pipe (42) and the first inlet pipe (11). The expansion valve (5) is provided with a first outlet pipe (51) and a second outlet pipe (52) respectively connected to the first inlet pipe (11) and the third outlet pipe (42). One-way valves (7) are respectively provided on the first inlet pipe (61), the second inlet pipe (62), the first outlet pipe (51) and the second outlet pipe (52).

2. The unit using a multi-set check valve system to regulate flow direction according to claim 1, characterized in that, In the cooling state, the one-way valve (7) on the first inlet pipe (61) and the first outlet pipe (51) is open, and the one-way valve (7) on the second inlet pipe (62) and the second outlet pipe (52) is closed; In heating mode, the one-way valve (7) on the second inlet pipe (62) and the second outlet pipe (52) is open, and the one-way valve (7) on the first inlet pipe (61) and the first outlet pipe (51) is closed.

3. The unit using multiple sets of one-way valves to regulate the flow direction according to claim 1, characterized in that, The four-way valve (3) is connected to the first outlet pipe (12), the second inlet pipe (21), the second outlet pipe (22), and the third inlet pipe (41), respectively.

4. The unit using multiple sets of one-way valves to regulate the flow direction according to claim 3, characterized in that, In the refrigeration state, the first outlet pipe (12) is connected to the second inlet pipe (21) through a four-way valve (3), and the second outlet pipe (22) is connected to the third inlet pipe (41) through a four-way valve (3); In heating mode, the third inlet pipe (41) is connected to the second inlet pipe (21) through a four-way valve (3), and the second outlet pipe (22) is connected to the first outlet pipe (12) through a four-way valve (3).

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