Variable-flow-path heat exchanger and air conditioner outdoor unit

Abstract

The utility model relates to the field of air conditioners, and particularly discloses a variable-flow-path heat exchanger and an air conditioner outdoor unit, the variable-flow-path heat exchanger comprises a single-cooling condenser core body, an inlet pipe assembly and an outlet pipe assembly, the single-cooling condenser core body comprises a refrigerant overheating section, and the refrigerant overheating section is communicated with the inlet pipe assembly; the refrigerant two-phase section is communicated with the refrigerant overheating section, one end of the outlet pipe assembly is communicated with the refrigerant overheating section, and the other end of the outlet pipe assembly is communicated with the refrigerant two-phase section; the refrigerant supercooling section communicates with the refrigerant two-phase section, and the refrigerant supercooling section communicates with the end, away from the refrigerant superheating section, of the inlet pipe assembly; and the heat exchange areas of the refrigerant superheating section, the refrigerant two-phase section and the refrigerant supercooling section are sequentially reduced. According to the scheme, in the process, the gas-liquid state switching of the refrigerant is matched with the heat exchange area of the refrigerant superheating section, the refrigerant two-phase section and the refrigerant supercooling section in size, so that the refrigerant keeps a stable speed when flowing in the single-cooling condenser core, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to a variable flow path heat exchanger and an air conditioner outdoor unit. Background Art

[0002] At present, when designing the outdoor condenser of a single-cooling air conditioner, fewer distribution flow paths are generally adopted for the refrigerant. This not only improves the supercooling degree, but also reduces the pressure loss of the diversion. This is because the gaseous refrigerant is in a high-pressure state in the condenser and has a small specific volume. Compared with the heat exchanger used as an evaporator, the flow resistance loss of the same length is smaller. Therefore, the pressure loss of the same flow path in the condenser and the evaporator is smaller. In addition, the longer the condensing pipe through which the refrigerant passes, the greater the supercooling degree can be formed, which can effectively reduce the dryness of the refrigerant after throttling and reduce cooling loss. Despite this, the one-branch design is rarely used because a single branch still has a large resistance loss during the gas phase condensation process, resulting in increased power consumption of the compressor. Therefore, the actual number of branches is generally greater than or equal to two branches. In order to balance the heat exchange of each branch, the pipeline flow of the refrigerant in each branch is roughly the same.

[0003] The advantage of this design is that it takes into account the pressure loss characteristics of the single cooling condenser on the basis of balancing the heat exchange capacity of each flow path, and to a certain extent, it maximizes the heat exchange efficiency of the heat exchanger. However, this solution is basically as described in the attached manual. Figure 1 As shown, when the existing single-cooling air conditioner is in refrigeration operation, a number of U-tubes are arranged in the condenser, and the U-tubes are divided into three paths. The refrigerant first enters the single-cooling condenser core 1 from the inlet pipe assembly 2 in three paths for heat exchange. After the heat exchange is completed, it flows into the outlet pipe assembly 3 from the three outlets to complete the outdoor condensation heat exchange. In this process, the refrigerant completes the superheated part heat exchange, the two-phase part heat exchange and the subcooled part heat exchange of the gaseous refrigerant in each core. The volume change of the refrigerant cannot be adapted to the heat exchanger, and the heat exchange efficiency is difficult to achieve further improvement; therefore, this scheme does not take into account the physical state change of the refrigerant in the heat exchange process in the condenser, such as from pure gas to gas-liquid two-phase state, and finally to pure liquid state. The volume and flow rate of the refrigerant are changing, the volume is getting smaller and smaller, while the volume of the heat exchanger has not changed, which will still cause the refrigerant flow rate to gradually decrease, which will reduce the heat transfer coefficient at the rear end of each flow path, and thus it is difficult to achieve the adaptation of the refrigerant physical state change and the heat exchanger volume. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present invention provides a variable flow heat exchanger and an air conditioner outdoor unit to solve the problem that the volume change of the refrigerant cannot be adapted to the heat exchanger and the heat exchange efficiency is difficult to further improve.

[0005] In order to achieve the above-mentioned object, the basic scheme of the present invention is as follows: a variable flow path heat exchanger, comprising a single cooling condenser core, an inlet pipe assembly and an outlet pipe assembly, wherein the single cooling condenser core comprises:

[0006] The refrigerant superheating section is connected to the inlet pipe assembly;

[0007] The refrigerant two-phase section is connected to the refrigerant superheating section, and one end of the outlet pipe assembly is connected to the refrigerant superheating section, and the other end of the outlet pipe assembly is connected to the refrigerant two-phase section;

[0008] The refrigerant subcooling section is connected to the refrigerant two-phase section, and the refrigerant subcooling section is connected to the end of the inlet pipe assembly away from the refrigerant superheating section;

[0009] The heat exchange areas of the refrigerant superheating section, the refrigerant two-phase section and the refrigerant supercooling section decrease in sequence.

[0010] The technical principle of the present invention is as follows: when the refrigerant is exchanging heat, the refrigerant enters the refrigerant superheating section, the refrigerant two-phase section and the refrigerant supercooling section in sequence through the inlet pipe assembly. In the refrigerant superheating section, the refrigerant in the gaseous state with a large volume and a large air pressure can be quickly heat-exchanged and cooled by the refrigerant superheating section with the largest heat exchange area to form a two-phase state where gas and liquid coexist. The refrigerant in the two-phase state then enters and is guided to the refrigerant two-phase section through the outlet pipe assembly for further cooling, thereby further reducing the refrigerant in the gaseous state; the liquid refrigerant can further enter the refrigerant supercooling section, and then be discharged into the inlet pipe assembly through the refrigerant supercooling section to exchange heat with the air.

[0011] In the above process, the refrigerant superheating section, the refrigerant two-phase section and the refrigerant supercooling section perform heat exchange treatment on the refrigerant in sequence. During this process, the gas-liquid state switching of the refrigerant is adapted to the heat exchange area size of the refrigerant superheating section, the refrigerant two-phase section and the refrigerant supercooling section, so that the refrigerant maintains a relatively stable speed when flowing in the refrigerant superheating section, the refrigerant two-phase section and the refrigerant supercooling section, and improves the heat exchange efficiency of the refrigerant superheating section, the refrigerant two-phase section and the refrigerant supercooling section.

[0012] Furthermore, the heat exchange area of ​​the refrigerant superheating section accounts for 50%-70% of the heat exchange area of ​​the single-cooling condenser core.

[0013] Through the above setting, since the heat exchange area of ​​the refrigerant superheating section is large, the larger heat exchange area can allow a large volume of high-pressure gaseous refrigerant to quickly enter the refrigerant superheating section for heat exchange cooling, quickly converting most of the refrigerant into liquid, making the refrigerant flow rate more stable and improving the heat exchange efficiency of the refrigerant.

[0014] Furthermore, the heat exchange area of ​​the refrigerant two-phase section accounts for 20%-30% of the heat exchange area of ​​the single-cooling condenser core.

[0015] Through the above setting, most of the refrigerant flowing to the refrigerant two-phase section is already in liquid phase. At this time, a slightly smaller heat exchange area is sufficient to further exchange heat for the refrigerant, which can improve the heat exchange efficiency and balance the local refrigerant pressure in the single-cooling condenser core.

[0016] Furthermore, the heat exchange area of ​​the refrigerant subcooling section accounts for 10%-15% of the heat exchange area of ​​the single-cooling condenser core.

[0017] Through the above setting, the refrigerant supercooling section can supplement the refrigerant two-phase section. The refrigerant here is already in liquid phase, which can further cool the liquid phase refrigerant and facilitate its transportation to the outside of the single-cooling condenser core for heat exchange.

[0018] Furthermore, the refrigerant supercooling section is connected to a main outlet pipe, which is connected to the inlet pipe assembly.

[0019] Through the above arrangement, the main outlet pipe can be connected to the inlet pipe assembly, which is convenient for transporting the refrigerant to the outside of the single-cooling condenser core and returning it to the single-cooling condenser core.

[0020] Further, the inlet pipe assembly includes:

[0021] An inlet main pipe, one end of which is connected to the main outlet pipe;

[0022] A plurality of inlet branch pipes are provided, one end of the inlet branch pipe is fixedly connected to an end of the inlet main pipe away from the main outlet pipe, and the other end of the inlet branch pipe is fixedly connected to the refrigerant superheating section.

[0023] Through the above arrangement, several inlet branch pipes can cooperate with the refrigerant superheating section to divert the gaseous refrigerant more evenly, so that the gaseous refrigerant can fully exchange heat with the refrigerant superheating section, thereby improving the heat exchange efficiency.

[0024] Further, the outlet pipe assembly includes:

[0025] An outlet main pipe, one end of which is connected to the refrigerant two-phase section;

[0026] A plurality of outlet branch pipes are provided, one end of the outlet branch pipe is fixedly connected to the refrigerant superheating section, and the other end of the outlet branch pipe is fixedly connected to the outlet main pipe.

[0027] Through the above arrangement, the refrigerant is collected and discharged through several outlet branch pipes and the outlet main pipe to enter the refrigerant two-phase section for heat exchange. As the volume of the refrigerant is reduced, in order to keep the flow rate of the refrigerant in the liquefaction process unchanged, the refrigerant branch is also adjusted from a multi-branch with several inlet branch pipes to a two-branch section connecting the refrigerant two-phase section with the refrigerant superheating section and the refrigerant two-phase section with the outlet main pipe. These two branches can allow the two-phase refrigerant to maintain a stable pressure and flow rate during circulation.

[0028] Furthermore, when the number of inlet branches is X, the number of outlet branches is also X, and X is greater than or equal to 3.

[0029] Through the above settings, several outlet branch pipes can correspond to several inlet branch pipes, so that the refrigerant in the refrigerant superheating section can be quickly discharged from several outlet branch pipes after heat exchange, and the outlet main pipe can converge the refrigerant from several outlet branch pipes into the refrigerant two-phase section, thereby realizing the control of the number of branches and better controlling the pressure and flow rate of the refrigerant.

[0030] Furthermore, the connection point between the refrigerant supercooling section and the refrigerant superheating section is 1.

[0031] Through the above setting, the two branches formed by the connection between the refrigerant two-phase section and the refrigerant superheating section and the connection between the refrigerant two-phase section and the outlet main pipe are connected to form one path formed by the connection between the refrigerant supercooling section and the refrigerant two-phase section. In this process, the volume of the refrigerant is further reduced. Therefore, one path is used for heat exchange at the refrigerant supercooling section to keep the refrigerant flow rate stable and improve the heat transfer coefficient.

[0032] The present invention further intends to provide an air-conditioning outdoor unit, comprising an air-conditioning outdoor unit body and a variable flow path heat exchanger, wherein the variable flow path heat exchanger is installed in the air-conditioning outdoor unit body.

[0033] The technical principle of the utility model is that the variable flow heat exchanger can cool the refrigerant more reasonably, can more effectively improve the cooling capacity and system energy efficiency of the air-conditioning outdoor unit, reduce energy consumption, and improve customer satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the heat exchanger in the background technology during heat exchange.

[0035] Figure 2 This is a heat exchange schematic diagram of a variable flow path heat exchanger in Example 1 of the present utility model.

[0036] In the above drawings: single cooling condenser core 1, inlet pipe assembly 2, inlet main pipe 21, three inlet branch pipes 22, outlet pipe assembly 3, outlet main pipe 31, outlet branch pipes 32, main outlet pipe 4, refrigerant superheating section 5, refrigerant two-phase section 6, refrigerant subcooling section 7. DETAILED DESCRIPTION

[0037] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0038] Example 1

[0039] This embodiment is basically as Figure 2As shown, an embodiment of the utility model proposes a variable flow path heat exchanger, including a single cooling condenser core 1, an inlet pipe assembly 2 and an outlet pipe assembly 3. The single cooling condenser core 1 includes a refrigerant superheating section 5, a refrigerant two-phase section 6 and a refrigerant supercooling section 7. The refrigerant superheating section 5 is connected to the inlet pipe assembly 2; the refrigerant two-phase section 6 is connected to the refrigerant superheating section 5, and one end of the outlet pipe assembly 3 is connected to the refrigerant superheating section 5, and the other end of the outlet pipe assembly 3 is connected to the refrigerant two-phase section 6; the refrigerant supercooling section 7 is connected to the refrigerant two-phase section 6, and the refrigerant supercooling section 7 is connected to the end of the inlet pipe assembly 2 away from the refrigerant superheating section 5, and the connection point between the refrigerant supercooling section 7 and the refrigerant superheating section 5 is 1.

[0040] At the same time, if Figure 2 As shown, the heat exchange area of ​​the refrigerant superheating section 5 accounts for 70% of the heat exchange area of ​​the single-cooling condenser core 1; the heat exchange area of ​​the refrigerant two-phase section 6 accounts for 20% of the heat exchange area of ​​the single-cooling condenser core 1; the heat exchange area of ​​the refrigerant subcooling section 7 accounts for 10% of the heat exchange area of ​​the single-cooling condenser core 1.

[0041] like Figure 2 As shown, the refrigerant supercooling section 7 is connected to the main outlet pipe 4, and the inlet pipe assembly 2 includes an inlet main pipe 21 and three inlet branch pipes 22. The upper end of the inlet main pipe 21 is connected to the main outlet pipe 4; one end of the inlet branch pipe is fixedly connected to the end of the inlet main pipe 21 away from the main outlet pipe 4, and the other end of the inlet branch pipe is fixedly connected to the refrigerant superheating section 5.

[0042] like Figure 2 As shown, the outlet pipe assembly 3 includes an outlet main pipe 31 and three outlet branch pipes 32. One end of the outlet main pipe 31 is connected to the refrigerant two-phase section 6; one end of the outlet branch pipe 32 is fixedly connected to the refrigerant superheating section 5, and the other end of the outlet branch pipe 32 is fixedly connected to the outlet main pipe 31.

[0043] In addition, when the number of inlet branches is X, the number of outlet branches 32 is also X, and X may be greater than three.

[0044] When the variable flow heat exchanger in this embodiment is in use, the refrigerant after cooling is in liquid state, and the refrigerant flows out through the main outlet pipe 4 and enters the inlet main pipe 21 to cool the air entering the air conditioner. The refrigerant after heat exchange gradually changes from liquid to gaseous state again. When the gaseous refrigerant is transferred to the inlet main pipe 21 near the inlet branch pipe, the three inlet branch pipes 22 divert the gaseous refrigerant so that the refrigerant enters the refrigerant superheat section 5 evenly. The heat exchange area of ​​the superheating section 5 accounts for 70% of the heat exchange area of ​​the single-cooling condenser core 1. The larger heat exchange area allows a large volume of high-pressure gaseous refrigerant to quickly enter the refrigerant superheating section 5 for heat exchange and cooling. In this process, due to the large heat exchange area of ​​the refrigerant superheating section 5, the same three-way inlet branch pipe is used. Compared with the heat exchange method in the background technology, the flow resistance of the gaseous refrigerant in the inlet branch pipe and the refrigerant superheating section 5 can be reduced, thereby improving the refrigeration efficiency of the gaseous refrigerant.

[0045] When the refrigerant changes from the superheated gas phase to the saturated gas phase, it will gradually condense into a liquid phase. In this heat exchange process, the refrigerant is in a two-phase state where the gas phase and the liquid phase coexist. At this time, the refrigerant is collected and discharged through the three outlet branch pipes 32 and the outlet main pipe 31 into the refrigerant two-phase section 6 for heat exchange. Since the volume of the refrigerant is reduced, in order to keep the flow rate of the refrigerant in the liquefaction process unchanged, the three-way refrigerant branch pipe 22 is adjusted to three branches connected to the refrigerant two-phase section 6 and the refrigerant superheated section 5, and the refrigerant two-phase section 6 is connected to the outlet main pipe 31. These two branches can allow the two-phase refrigerant to maintain a stable pressure and flow rate during circulation, and then stably enter the refrigerant two-phase section 6 for further heat exchange and cooling to a gradually liquefied state. The refrigerant in the refrigerant two-phase section 6 is in a continuous gas phase, and the refrigerant in the liquid phase is increased.

[0046] When the refrigerant reaches a completely liquid phase state, the heat exchange refrigerant will enter the supercooling section for heat exchange. At this time, the refrigerant two-phase section 6 is connected with the refrigerant superheating section 5, and the refrigerant two-phase section 6 is connected with the outlet main pipe 31 to form two branches, which is the refrigerant supercooling section 7 and the refrigerant two-phase section 6. The refrigerant entering the refrigerant supercooling section 7 continues to undergo supercooling heat exchange. The refrigerant in this heat exchange area is completely in a liquid phase state. During this process, the volume of the refrigerant is further reduced. Therefore, one path is used for heat exchange at the refrigerant supercooling section 7 to maintain a stable refrigerant flow rate, improve the heat transfer coefficient, and increase the supercooling degree of the refrigerant. Finally, after the refrigerant completes the heat exchange in the refrigerant supercooling section 7, it flows out stably through the main outlet pipe 4.

[0047] In the above whole process, by changing the number of flow paths on the single-cooling condenser core 1, the inlet pipe assembly 2 and the outlet pipe assembly 3, and dividing the heat exchange area occupied by the refrigerant superheating section 5, the refrigerant two-phase section 6 and the refrigerant supercooling section 7, the refrigerant physical state, flow rate, pressure and heat exchanger volume can be integrated on the basis of the existing heat exchanger design, thereby further improving the efficiency of the heat exchanger and achieving higher cooling capacity and system energy efficiency.

[0048] Example 2

[0049] The difference between Example 2 and Example 1 is that an air-conditioning outdoor unit is provided, including an air-conditioning outdoor unit body and a variable flow path heat exchanger, and the variable flow path heat exchanger is installed in the air-conditioning outdoor unit body.

[0050] When the air-conditioning outdoor unit in this embodiment is in use, the variable flow heat exchanger can cool the refrigerant more reasonably, which can more effectively improve the cooling capacity and system energy efficiency of the air-conditioning outdoor unit, reduce energy consumption, and improve customer satisfaction.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A variable flow heat exchanger, comprising a single cooling condenser core, an inlet pipe assembly and an outlet pipe assembly, characterized in that: The cooling-only condenser core includes: a refrigerant superheating section, the refrigerant superheating section being in communication with the inlet pipe assembly; A refrigerant two-phase section, wherein the refrigerant two-phase section is connected to the refrigerant superheating section, and one end of the outlet pipe assembly is connected to the refrigerant superheating section, and the other end of the outlet pipe assembly is connected to the refrigerant two-phase section; a refrigerant subcooling section, the refrigerant subcooling section being connected to the refrigerant two-phase section, and the refrigerant subcooling section being connected to an end of the inlet pipe assembly away from the refrigerant superheating section; The heat exchange areas of the refrigerant superheating section, the refrigerant two-phase section and the refrigerant supercooling section decrease in sequence.

2. The variable flow path heat exchanger according to claim 1, characterized in that: The heat exchange area of ​​the refrigerant superheating section accounts for 50%-70% of the heat exchange area of ​​the single-cooling condenser core.

3. The variable flow path heat exchanger according to claim 2, characterized in that: The heat exchange area of ​​the refrigerant two-phase section accounts for 20%-30% of the heat exchange area of ​​the single-cooling condenser core.

4. The variable flow path heat exchanger according to claim 3, characterized in that: The heat exchange area of ​​the refrigerant supercooling section accounts for 10%-15% of the heat exchange area of ​​the single-cooling condenser core.

5. The variable flow path heat exchanger according to claim 4, characterized in that: The refrigerant supercooling section is connected with a main outlet pipe, and the main outlet pipe is connected with the inlet pipe assembly.

6. The variable flow path heat exchanger according to claim 5, characterized in that: The inlet pipe assembly comprises: an inlet main pipe, one end of which is connected to the main outlet pipe; A plurality of inlet branch pipes, one end of the inlet branch pipe is fixedly connected to an end of the inlet main pipe away from the main outlet pipe, and the other end of the inlet branch pipe is fixedly connected to the refrigerant superheating section.

7. The variable flow path heat exchanger according to claim 6, characterized in that: The outlet pipe assembly comprises: An outlet main pipe, one end of which is connected to the refrigerant two-phase section; A plurality of outlet branch pipes are provided, one end of each outlet branch pipe is fixedly connected to the refrigerant superheating section, and the other end of each outlet branch pipe is fixedly connected to the outlet main pipe.

8. The variable flow path heat exchanger according to claim 7, characterized in that: When the number of inlet branches is X, the number of outlet branches is also X, and X is greater than or equal to 3.

9. The variable flow path heat exchanger according to claim 1, characterized in that: The connection point between the refrigerant supercooling section and the refrigerant superheating section is 1.

10. An air conditioner outdoor unit, characterized in that: It comprises an air-conditioning outdoor unit body and a variable flow path heat exchanger as described in any one of claims 1 to 9, wherein the variable flow path heat exchanger is installed in the air-conditioning outdoor unit body.

Images