Heat exchanger and air conditioner having the same

Abstract

The utility model relates to a kind of heat exchanger and the air conditioner with the heat exchanger, heat exchanger includes heat exchange pipe, the heat exchange pipe (41) includes the pipe body (411) with fin for heat exchange and is located at the both ends of pipe body and is used for the connecting end (412) for connection;Its characterized in that: the heat exchange pipe (41) inside is provided with throttling device (6), and the throttling device (6) is located in the connecting end (412) of the refrigeration flow direction entrance of heat exchanger.In refrigeration working condition, refrigerant enters the heat exchange pipe of heat exchanger and is throttled disturbance by throttling device, make refrigerant liquefaction and occur strong disturbance in flow direction, can effectively break at least is reduce the liquid film on the inner wall of the heat exchange pipe of heat exchanger, improve the heat exchange efficiency of heat exchanger, to improve refrigeration energy efficiency ratio.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning, specifically to a heat exchanger and an air conditioner having the heat exchanger. Background Technology

[0002] Traditional air conditioners typically consist of a compressor, a four-way valve, a condenser, a throttling device, and an evaporator, all connected by piping. The compressor, four-way valve, condenser, and throttling device are located in the outdoor unit, while the evaporator is located indoors. Specifically, the throttling device is positioned between the condenser and evaporator, closer to the condenser and farther from the evaporator. During cooling, the high-temperature, high-pressure gaseous refrigerant output from the compressor enters the condenser through the four-way valve, exchanging heat with the outdoor environment. When cooled below a critical temperature, the refrigerant condenses from a gaseous state to a liquid state. Then, the liquid refrigerant is depressurized by the throttling device, becoming low-pressure refrigerant, and enters the evaporator in the indoor unit through a long piping, where it exchanges heat with the indoor environment and evaporates back into a gaseous state, completing the cooling cycle. During heating, the refrigerant discharged from the compressor enters the evaporator directly through the four-way valve. Because the throttling device is located in the outdoor unit, far from the evaporator, the refrigerant undergoes incomplete liquefaction and releases heat in the evaporator. The gas-liquid mixture then returns to the throttling device, enters the condenser, exchanges heat with the outside environment, and returns to the compressor, completing the heating cycle. In the traditional air conditioners mentioned above, the long pipeline between the throttling device and the evaporator has a high degree of superheat, resulting in a significant loss of cooling capacity and affecting the cooling effect.

[0003] To improve energy efficiency, dual-throttling air conditioners were later developed, as seen in utility model patent CN21497084U. These air conditioners feature separate outdoor and indoor throttling devices, with the indoor device located near the evaporator, which improves energy efficiency. However, in actual use, the inventors found that there is still room for further improvement in heat exchange performance. Summary of the Invention

[0004] The purpose of this invention is to provide a heat exchanger and an air conditioner having the heat exchanger, so as to further improve the energy efficiency ratio of cooling.

[0005] To achieve the above objectives, the heat exchanger technology adopted by this utility model is as follows: a heat exchanger, serving as an evaporator or condenser for an air conditioner, the heat exchanger includes a heat exchange tube, the heat exchange tube includes a finned tube body for heat exchange and connecting ends located at both ends of the tube body for connection; a throttling device is provided inside the heat exchange tube, and the throttling device is located inside the connecting end at the refrigeration flow inlet of the heat exchanger.

[0006] In the above scheme, the "tube body" refers to the main body of the heat exchange tube with external fins that performs the heat exchange function, while the "connection end" refers to the bare tube part at both ends of the heat exchange tube. The connection end is used to connect with the piping of other parts of the air conditioning system.

[0007] In the above scheme, the phrase "the throttling device is located inside the connection end at the refrigeration flow inlet of the heat exchanger" means that at least the main body of the throttling device must be located inside the connection end, including two situations: 1. The entire throttling device is located inside the connection end; 2. The main body of the throttling device is located inside the connection end and extends into the tube body.

[0008] In the above scheme, the throttling device is a capillary throttling device, which specifically includes a capillary tube.

[0009] In the above scheme, the heat exchange tube is also provided with a blocking part inside the throttling device, so that the refrigerant flows through the throttling device to the blocking part under refrigeration conditions, and is blocked by the blocking part, thus causing its flow direction to bend and change direction.

[0010] Furthermore, the throttling device is a capillary throttling device, specifically comprising a capillary tube fixed inside the connecting end, with a bend on it. This bend acts as a blocking part, allowing the refrigerant to flow into the capillary tube under refrigeration conditions and, upon passing through the blocking part, bend and change direction due to the obstruction and guidance of the blocking part. Even further, the angle of the bend in the capillary tube, i.e., the angle between the inlet axis and the outlet axis of the capillary tube, is preferably between 120° and 105°.

[0011] Furthermore, the throttling device is a nozzle throttling device, which includes a nozzle housing and a nozzle disposed within the nozzle housing. The nozzle housing is fixed within the connecting end, and a refrigerant flow gap is left between the periphery of the blocking part and the nozzle housing, allowing the refrigerant to flow through the nozzle to the blocking part under refrigeration conditions. Further still, the blocking part is fixedly connected to the nozzle housing or the inner wall of the connecting end via a bracket.

[0012] In the above scheme, the heat exchanger is provided with one or more heat exchange pipeline units, and the throttling device is also provided with one or more correspondingly connected in parallel inside the heat exchange tubes of the corresponding heat exchange pipeline units.

[0013] In the above scheme, the throttling device is located inside the connection end and extends into the pipe body.

[0014] To achieve the above objectives, the air conditioning technology solution adopted by this utility model is: an air conditioner, including a compressor connected in a loop by pipes and two heat exchangers; at least one of the two heat exchangers is the heat exchanger solution described above.

[0015] This invention breaks with conventional thinking by directly placing the throttling device inside the heat exchange tube of the heat exchanger. Under refrigeration conditions, when the refrigerant enters the inlet connection end of the heat exchange tube 41 of the heat exchanger 4, it is throttled by the throttling device 6 and undergoes nucleation boiling phase change on the inner wall surface of the heat exchange tube 41, resulting in efficient heat exchange and thus improving heat exchange efficiency and refrigeration energy efficiency ratio.

[0016] The following is information from comparative experiments with existing technologies: Attached Figure Description

[0017] Figure 1 This is an overall schematic diagram of Embodiment 1 of the present utility model; Figure 2 for Figure 1 An enlarged schematic diagram of the throttling device in the middle; Figure 3 This is an enlarged schematic diagram of the throttling device in Embodiment 3 of this utility model; Figure 4 This is an enlarged schematic diagram of the throttling device in Embodiment 5 of this utility model.

[0018] In the above attached diagram: 1. Compressor; 2. Four-way valve; 3. Connecting pipeline; 4. Heat exchanger; 41. Heat exchange tube; 411. Tube body; 412. Connecting end; 42. Fin; 5. Outdoor throttling device; 6. Throttling device; 61. Nozzle housing; 62. Nozzle; 63. Capillary tube; 7. Blocking part; 71. Support. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: Example 1: See Figure 1 and Figure 2 As shown, an air conditioner: This air conditioner, such as Figure 1 It includes a compressor 1 connected in a loop by connecting pipe 3, a four-way valve 2, and two heat exchangers 4 (i.e., condenser and evaporator).

[0020] Heat exchanger 4 is typically a finned tube heat exchanger. Heat exchanger 4 includes heat exchange tubes 41, each comprising a tube body 411 with fins 42 for heat exchange and connecting ends 412 at both ends of the tube body for connection. The tube body 411 refers to the main body of the heat exchange tube 41 with external fins 42 that performs the heat exchange function, while the connecting ends 412 refer to the bare tube portions at both ends of the heat exchange tube. The connecting ends 412 are used to connect to the connecting pipe 3.

[0021] See Figure 1 and Figure 2 As shown, a throttling device 6 is provided inside the heat exchange tube 41, and the throttling device 6 is located in the connection end 412 at the refrigeration flow inlet of the heat exchanger. This means that the main body of the throttling device should be located inside the connection end 412 (i.e., the end of the bare tube), and preferably extends slightly from the connection end 412 into the tube body 411 (i.e., the main body of the heat exchange tube with external fins).

[0022] See Figure 1 and Figure 2 As shown, the heat exchange tube 41 is also provided with a blocking part 7 inside the throttling device 6, so that the refrigerant flows through the throttling device 6 to the blocking part 7 under the refrigeration condition, and is blocked by the blocking part 7, thus causing its flow direction to bend and change direction.

[0023] Specifically, such as Figure 2 As shown, the throttling device 6 is a nozzle throttling device, which includes a nozzle housing 61 and a nozzle 62 disposed in the nozzle housing 61. The nozzle housing 61 is fixed in the connecting end 412. A refrigerant flow gap is left between the periphery of the blocking part 7 and the nozzle housing 61, so that the refrigerant flows through the nozzle 62 to the blocking part 7 under refrigeration conditions.

[0024] Specifically, the blocking part 7 is fixedly connected to the nozzle housing 61 or the inner wall of the connecting end 412 via the bracket 71.

[0025] Specifically, the blocking part 7 can be a baffle, a block, an arc-shaped baffle, or other forms. It only needs to block the refrigerant at the outlet of the nozzle 62 where the refrigerant flows downward, so that the flow direction of the refrigerant changes and the effect is achieved.

[0026] like Figure 2 As shown, the blocking part 7 is specifically a flat baffle, which is fixedly connected to the inner wall of the nozzle housing 61 or the connecting end 412 via a bracket 71. Specifically, the flat baffle is connected to a sleeve via the bracket 71, and the sleeve is fixedly embedded inside the nozzle housing 61. This is only a preferred embodiment; other fixing methods can be used in practice.

[0027] See Figure 1 As shown, an outdoor throttling device 5 is also provided between the two heat exchangers 4. The outdoor throttling device 5 is an electronic expansion valve, capillary tube or nozzle throttling device.

[0028] See Figure 1 As shown, the heat exchanger 4 is provided with one or more heat exchange piping units, and the throttling device 6 is also provided with one or more corresponding units, which are connected in parallel and inserted into the heat exchange tubes 41 of the corresponding heat exchange piping units. Specifically, as shown... Figure 2 As shown, the heat exchanger 4 is configured with multiple heat exchange pipeline units, and the throttling device 6 is also configured with multiple units, which are connected in parallel and inserted into the heat exchange tubes 41 of the corresponding heat exchange pipeline units.

[0029] During refrigeration, compressor 1 draws in low-temperature, low-pressure gas, compresses it into high-temperature, high-pressure gas, and enters the outdoor heat exchanger 4 through four-way valve 2. The outdoor fan cools it into liquid, and after passing through the outdoor throttling device 5 for one throttling, it enters the room. Then, it passes through the throttling device 6 installed in the indoor heat exchanger 4 for a second throttling, becoming a low-temperature, low-pressure liquid that exchanges heat with the indoor hot air, becoming a low-temperature, low-pressure gas, which is then drawn in by compressor 1 again, and so on.

[0030] During heating, compressor 1 draws in low-temperature, low-pressure gas, compresses it into high-temperature, high-pressure gas, and then passes through four-way valve 2 into indoor heat exchanger 4. Indoor fan cools it into liquid, which then passes through throttling device 6 and outdoor throttling device 5 into outdoor heat exchanger 4, where it exchanges heat with outdoor air, becoming low-temperature, low-pressure gas again. This process is repeated. The throttling device 6 does not affect heating.

[0031] See Figure 1 As shown, in this embodiment, the throttling device 6 is only installed on the indoor heat exchanger 4, and the outdoor heat exchanger 4 does not have the throttling device 6 installed. In practice, the throttling device 6 can also be installed in the heat exchange tubes of both the indoor heat exchanger 4 and the outdoor heat exchanger 4.

[0032] This embodiment breaks with conventional thinking by directly installing the throttling device 6 inside the heat exchange tube 41 of the indoor heat exchanger 4 (i.e., the evaporator). Under refrigeration conditions, when the refrigerant enters the inlet connection end of the heat exchange tube 41 of the heat exchanger 4, it is throttled by the throttling device 6 and undergoes a nucleation boiling phase change on the inner wall surface of the heat exchange tube 41, resulting in efficient heat exchange and thus improving the heat exchange efficiency and the refrigeration energy efficiency ratio.

[0033] Furthermore, the blocking part 7 is provided to prevent the refrigerant flowing into the heat exchanger 4 from flowing too fast through the throttling device 6, which further increases the turbulence and further breaks or hinders the formation of the liquid film on the inner wall of the heat exchange tube 41 of the heat exchanger 4, thereby further improving the heat exchange efficiency and thus improving the refrigeration energy efficiency ratio.

[0034] Example 2: A heat exchanger 4, the structure of which is the same as the indoor heat exchanger 4 in Example 1. The specific structure will not be described in detail.

[0035] Example 3: An air conditioner: The air conditioner's overall structure is also like... Figure 1 It includes a compressor 1 connected in a loop by connecting pipe 3, a four-way valve 2, and two heat exchangers 4. The difference from Embodiment 1 is: see [link to Embodiment 1] Figure 3As shown, the throttling device 6 is a capillary throttling device, which includes a capillary tube 63. The capillary tube 63 is disposed within the connecting end 412 of the heat exchange tube 41 and does not have a blocking part 7. Specifically, the connecting pipe 3 from the outdoor heat exchanger 4 is directly and sealed to the end of the capillary tube 63, while the connecting end 412 of the heat exchange tube 41 is fitted onto the outer circumference of the connecting pipe 3 for sealing. This is the specific connection method; other fixing methods can be used in practice.

[0036] The rest is the same as in Example 1, and will not be repeated here.

[0037] Example 4: A heat exchanger 4, the structure of which is the same as the indoor heat exchanger 4 in Example 3. The specific structure will not be described in detail.

[0038] Example 5: An air conditioner: The air conditioner's overall structure is also like... Figure 1 The difference from Example 3 is as follows: See Figure 4 As shown, the capillary tube 63 is not a straight tube; it has a bend, which serves as a blocking section 7. During refrigeration, the refrigerant flows through the capillary tube 63 and then through the blocking section 7, where its flow direction is redirected by the obstruction. Specifically, the angle of the bend in the capillary tube 63, i.e., the angle α between the inlet axis and the outlet axis of the capillary tube 63, is between 120° and 105°.

[0039] The rest is the same as in Example 3, and will not be repeated here.

Claims

1. A heat exchanger, serving as an evaporator or condenser in an air conditioner, the heat exchanger comprising a heat exchange tube (41), the heat exchange tube (41) comprising a finned tube body (411) for heat exchange and connecting ends (412) located at both ends of the tube body for connection; characterized in that: The heat exchange tube (41) is provided with a throttling device (6), and the throttling device (6) is located in the connection end (412) at the refrigeration flow inlet of the heat exchanger.

2. The heat exchanger according to claim 1, characterized in that: The throttling device (6) is a capillary throttling device, which specifically includes a capillary (63).

3. The heat exchanger according to claim 1, characterized in that: The heat exchange tube (41) is also provided with a blocking part (7) inside the throttling device (6), so that the refrigerant flows through the throttling device (6) to the blocking part (7) under the refrigeration condition, and is blocked by the blocking part (7) so that its flow direction is bent and changed.

4. The heat exchanger according to claim 3, characterized in that: The throttling device (6) is a capillary throttling device, which specifically includes a capillary tube (63). The capillary tube (63) is fixed inside the connecting end (412) and has a bend. The bend serves as a blocking part (7), so that when the refrigerant flows into the capillary tube (63) under refrigeration conditions, it passes through the blocking part (7) and is blocked and guided by the blocking part (7), thereby causing its flow direction to bend and change direction.

5. The heat exchanger according to claim 4, characterized in that: The angle at the bend of the capillary (63), that is, the angle between the inlet axis and the outlet axis of the capillary (63), is 120° to 105°.

6. The heat exchanger according to claim 3, characterized in that: The throttling device (6) is a nozzle throttling device. The nozzle throttling device includes a nozzle housing (61) and a nozzle (62) disposed in the nozzle housing (61). The nozzle housing (61) is fixed in the connecting end (412). A refrigerant flow gap is left between the periphery of the blocking part (7) and the nozzle housing (61) so that the refrigerant flows through the nozzle (62) to the blocking part (7) under refrigeration conditions.

7. The heat exchanger according to claim 6, characterized in that: The blocking part (7) is fixedly connected to the inner wall of the nozzle housing (61) or the connecting end (412) via the bracket (71).

8. The heat exchanger according to claim 1, characterized in that: The heat exchanger (4) is provided with one or more heat exchange pipeline units, and the throttling device (6) is also provided with one or more, which are connected in parallel and inserted into the heat exchange tube (41) of the corresponding heat exchange pipeline unit.

9. The heat exchanger according to claim 1, characterized in that: The throttling device (6) is located within the connection end (412) and extends into the tube body (411).

10. An air conditioner comprising a compressor (1) connected in a loop by connecting pipes (3) and two heat exchangers (4); characterized in that: At least one of the two heat exchangers (4) is the heat exchanger described in any one of claims 1-9.

Images