Heat exchanger, outdoor unit and air conditioner

Abstract

The utility model discloses a heat exchanger, outdoor unit and air conditioner, the heat exchanger includes flow direction switching component and at least two parallel heat exchange pipe section, flow direction switching component with each heat exchange pipe section is communicated, flow direction switching component is used for switching the flow direction of refrigerant in the heat exchange pipe section between first flow direction and second flow direction, the first flow direction is opposite to the second flow direction; aiming at the non-azeotropic refrigerant, the inlet end of the heat exchange pipe section can be switched to the outlet end, the original inlet end (the existing outlet end) of the heat exchange pipe section is heated by using the non-azeotropic refrigerant with the characteristic that the temperature of the outlet is higher, and the flow direction of the refrigerant in the heat exchange pipe section is continuously switched, so that the heat exchange efficiency is improved. The frost at the original inlet end (the existing outlet end) is melted or the frosting rate at the position is delayed, and then the heating performance of the air conditioner is guaranteed as much as possible.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to a heat exchanger, an outdoor unit, and an air conditioner. Background Technology

[0002] Non-azeotropic refrigerants are refrigerants composed of two or more substances. Due to the different boiling points of their components, one component evaporates first during evaporation, followed by the other; the opposite occurs during condensation. This leads to temperature changes during isobaric phase transitions, resulting in temperature glide during evaporation or condensation. If this phenomenon occurs in the heating mode of an air conditioner, the outdoor heat exchanger may experience excessively high inlet and outlet temperatures—that is, a lower inlet temperature and a higher outlet temperature. This makes the inlet of the heat exchanger coil more prone to frost and ice buildup at lower operating temperatures, which can worsen outdoor heat exchange and affect indoor comfort. Utility Model Content

[0003] The main objective of this utility model embodiment is to provide a heat exchanger, outdoor unit, and air conditioner, aiming to improve the technical problem in the prior art that non-azeotropic refrigerants are more prone to causing icing at the inlet of the outdoor heat exchanger coil in heating mode.

[0004] An embodiment of this utility model provides a heat exchanger, which includes:

[0005] At least two parallel heat exchanger tube sections;

[0006] A flow direction switching component is connected to each of the heat exchange tube segments. The flow direction switching component is used to switch the flow direction of the refrigerant in the heat exchange tube segment between a first flow direction and a second flow direction, wherein the first flow direction and the second flow direction are opposite to each other.

[0007] In some embodiments of this utility model, the heat exchanger further includes a heating inlet and a heating outlet;

[0008] The flow direction switching component includes a first flow path, a second flow path, and a switching module. The first flow path and the second flow path are connected in parallel between the heating inlet and the heating outlet. At least two heat exchange tube segments are connected in parallel between the first flow path and the second flow path.

[0009] The flow direction switching module has a first state and a second state that can be switched between each other. When the switching module is in the first state, the heating inlet is connected to the first flow path and isolated from the second flow path, and the heating outlet is isolated from the first flow path and connected to the second flow path.

[0010] When the switching module is in the second state, the heating inlet is isolated from the first flow path and connected to the second flow path, and the heating outlet is connected to the first flow path and isolated from the second flow path.

[0011] In some embodiments of this utility model, the switching module includes a first valve, a second valve, a third valve, and a fourth valve. The first valve is connected between the first flow path and the heating inlet, the second valve is connected between the first flow path and the heating outlet, the third valve is connected between the second flow path and the heating inlet, and the fourth valve is connected between the second flow path and the heating outlet.

[0012] When the switching module is in the first state, the first valve is open, the second valve is closed, the third valve is closed, and the fourth valve is open;

[0013] When the switching module is in the second state, the first valve is closed, the second valve is open, the third valve is open, and the fourth valve is closed.

[0014] In some embodiments of this utility model, the switching module includes a first three-way valve and a second three-way valve. The first three-way valve is connected to the heating inlet, the first flow path, and the second flow path, respectively. The second three-way valve is connected to the heating outlet, the end of the first flow path away from the heating inlet, and the end of the second flow path away from the heating inlet, respectively.

[0015] When the switching module is in the first state, the first three-way valve switches to connect the heating inlet to the first flow path and isolate it from the second flow path, and the second three-way valve switches to isolate the heating outlet from the first flow path and connect it to the second flow path.

[0016] When the switching module is in the second state, the first three-way valve switches to isolate the heating inlet from the first flow path and connect it to the second flow path, and the second three-way valve switches to connect the heating outlet to the first flow path and isolate it from the second flow path.

[0017] In some embodiments of this utility model, a flow divider is provided on both the first flow path and the second flow path. The flow divider is used to divert the refrigerant in the first flow path / second flow path into the heat exchange tube section connected to it.

[0018] In some embodiments of this utility model, the heating outlet is located at the top of the heat exchanger, the heating inlet is located at the bottom of the heat exchanger, and the flow direction of the heat exchange tube section is "N" shaped along the direction from the heating outlet to the heating inlet.

[0019] In some embodiments of this utility model, the switching module is electrically connected to the controller, and the controller can control the switching module to switch between the first state and the second state.

[0020] In some embodiments of this utility model, a temperature sensor is provided on the heat exchanger, and the temperature sensor is electrically connected to the controller. The controller is used to control the switching module to switch between the first state and the second state based on the temperature information fed back by the temperature sensor.

[0021] In some embodiments of this utility model, an outdoor unit is also provided, which includes the heat exchanger described above.

[0022] In some embodiments of this utility model, an air conditioner is also provided, including the outdoor unit described above.

[0023] This utility model provides a heat exchanger, an outdoor unit, and an air conditioner. The heat exchanger, by setting a flow direction switching device, can switch the refrigerant in the heat exchange tube section from a first flow direction to a second flow direction, or vice versa. For non-azeotropic refrigerants, this utility model can switch the inlet end of the heat exchange tube section to the outlet end, using the non-azeotropic refrigerant with a higher outlet temperature to heat the original inlet end (now the outlet end) of the heat exchange tube section. By continuously switching the flow direction of the refrigerant in the heat exchange tube section, the frost at the original inlet end (now the outlet end) is melted or the frost rate at that point is slowed down, thereby ensuring the heating performance of the air conditioner as much as possible. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a heat exchanger structure in the prior art;

[0026] Figure 2 This is a schematic diagram of the structure of a heat exchanger according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the heat exchanger according to the second embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the heat exchanger according to the third embodiment of the present invention.

[0029] Reference numerals: 100, heating outlet; 200, heating inlet; 300, switching module; 310, first valve; 320, second valve; 330, third valve; 340, fourth valve; 350, first three-way valve; 360, second three-way valve; 600, heat exchange tube section; 700, distributor. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Furthermore, 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. Additionally, 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. Furthermore, 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.

[0034] like Figures 1-4 As shown, this utility model provides a heat exchanger, including at least two parallel heat exchange tube sections 600 and a flow direction switching component. The flow direction switching component is connected to each heat exchange tube section 600 and is used to switch the flow direction of the refrigerant in the heat exchange tube section 600 between a first flow direction and a second flow direction, wherein the first flow direction and the second flow direction are opposite.

[0035] The heat exchange tube section 600 is a single-tube structure in the heat exchanger used to pass through the fins to allow the refrigerant to exchange heat with the air. It generally has two ports, one for the refrigerant to flow in and one for the refrigerant to flow out. If the heat exchange tube section 600 has a first port and a second port, when the refrigerant flows in the heat exchange tube section 600 in the first direction, the refrigerant flows in from the first port and flows out from the second port; when the refrigerant flows in the heat exchange tube section 600 in the second direction, the refrigerant flows in from the second port and flows out from the first port.

[0036] Due to the characteristics of the non-azeotropic refrigerant, when the air conditioner is in heating mode, the temperature difference between the inlet and outlet of the heat exchange tube section 600 of the outdoor heat exchanger is too large. For example, the inlet temperature of the heat exchange tube section 600 is -2.7℃ and the outlet temperature is 4.1℃; or the inlet temperature is -2.9℃ and the outlet temperature is 3.9℃; or the inlet temperature is -3.2℃ and the outlet temperature is 4.0℃.

[0037] For non-azeotropic refrigerants, this invention allows the inlet end of heat exchange tube section 600 to be switched to the outlet end. When the refrigerant flows in the heat exchange tube section 600 in the first direction, it enters the heat exchange tube section 600 through the first port and exits through the second port. When the refrigerant flows in the heat exchange tube section 600 in the second direction, it enters the heat exchange tube section 600 through the second port and exits through the first port. In other words, the original inlet end (now outlet end) of the heat exchange tube section 600 is heated by using a non-azeotropic refrigerant with a higher outlet temperature. By continuously switching the refrigerant flow direction in the heat exchange tube section 600, the frost at the original inlet end (now outlet end) is melted or the frost formation rate at that point is slowed down, thereby avoiding or slowing down the frost formation of the heat exchanger and thus ensuring the heating performance of the air conditioner as much as possible.

[0038] In some embodiments, the heat exchanger further includes a heating inlet 200 and a heating outlet 100; the flow direction switching assembly includes a first flow path, a second flow path, and a switching module 300, wherein the first flow path and the second flow path are connected in parallel between the heating inlet 200 and the heating outlet 100, and at least two heat exchange tube sections 600 are connected in parallel between the first flow path and the second flow path. The flow direction switching module 300 has a first state and a second state that can be switched between each other. When the switching module 300 is in the first state, the heating inlet 200 is connected to the first flow path and isolated from the second flow path, and the heating outlet 100 is isolated from the first flow path and connected to the second flow path. When the switching module 300 is in the second state, the heating inlet 200 is isolated from the first flow path and connected to the second flow path, and the heating outlet 100 is connected to the first flow path and isolated from the second flow path.

[0039] Among them, the heating inlet section 200 is the inlet of the refrigerant in the outdoor heat exchanger when the air conditioner is in heating mode, and the heating outlet section 100 is the outlet of the refrigerant in the indoor heat exchanger when the air conditioner is in heating mode.

[0040] Understandably, when the switching module is in the first state, the refrigerant enters the first flow path from the heating inlet 200, and then flows into each heat exchange tube section 600 for heat exchange. After heat exchange is completed in each heat exchange tube section 600, the refrigerant flows into the second flow path from each heat exchange tube section 600, and then flows out of the heat exchanger through the heating outlet 100. That is, at this time, the flow direction of the heat exchange tube section 600 is from the end closer to the first flow path to the end closer to the second flow path. When the switching module is in the second state, the refrigerant enters the second flow path from the heating inlet 200, and then flows into each heat exchange tube section 600 for heat exchange. After heat exchange is completed in each heat exchange tube section 600, the refrigerant flows into the first flow path from each heat exchange tube section 600, and then flows out of the heat exchanger through the heating outlet 100. That is, at this time, the flow direction of the heat exchange tube section 600 is from the end closer to the second flow path to the end closer to the first flow path.

[0041] In some embodiments, the switching module 300 includes a first valve 310, a second valve 320, a third valve 330, and a fourth valve 340. The first valve 310 is connected between the first flow path and the heating inlet 200, the second valve 320 is connected between the first flow path and the heating outlet 100, the third valve 330 is connected between the second flow path and the heating inlet 200, and the fourth valve 340 is connected between the second flow path and the heating outlet 100. When the switching module 300 is in a first state, the first valve 310 is open, the second valve 320 is closed, the third valve 330 is closed, and the fourth valve 340 is open. When the switching module 300 is in a second state, the first valve 310 is closed, the second valve 320 is open, the third valve 330 is open, and the fourth valve 340 is closed.

[0042] Specifically, the first valve 310 controls whether the first flow path is connected to the heating inlet 200, the second valve 320 controls whether the first flow path is connected to the heating outlet 100, the third valve 330 controls whether the second flow path is connected to the heating inlet 200, and the fourth valve 340 controls whether the second flow path is connected to the heating outlet 100. That is, by controlling the opening and closing of the first valve 310, the second valve 320, the third valve 330, and the fourth valve 340, the connection status of the first flow path, the second flow path, and the heating inlet 200 and heating outlet 100 can be switched.

[0043] For example, when the switching module 300 is in the first state, the first valve 310 is open, the second valve 320 is closed, the third valve 330 is closed, and the fourth valve 340 is open. That is, the first flow path is connected to the heating inlet 200 and isolated from the heating outlet 100, and the second flow path is isolated from the heating inlet 200 and connected to the heating outlet 100. The refrigerant flows from the heating inlet 200 into the first flow path, then from the first flow path into each heat exchange tube section 600, and then from each heat exchange tube section 600 into the second flow path, and then from the second flow path out of the heat exchanger through the heating outlet 100.

[0044] When the switching module 300 is in the second state, the first valve 310 is closed and the second valve 320 is open, so the first flow path is isolated from the heating inlet 200 and connected to the heating outlet 100. The third valve 330 is open and the fourth valve 340 is open, so the second flow path is connected to the heating inlet 200 and isolated from the heating outlet 100. That is, the refrigerant flows from the heating inlet 200 into the second flow path, then from the second flow path into each heat exchange tube section 600, then from each heat exchange tube section 600 into the first flow path, and then from the first flow path out of the heat exchanger through the heating outlet 100.

[0045] In some embodiments, the switching module 300 includes a first three-way valve 350 and a second three-way valve 360. The first three-way valve 350 is connected to the heating inlet 200, the first flow path, and the second flow path, respectively. The second three-way valve 360 ​​is connected to the heating outlet 100, the end of the first flow path away from the heating inlet 200, and the end of the second flow path away from the heating inlet 200, respectively.

[0046] When the switching module 300 is in the first state, the first three-way valve 350 switches to connect the heating inlet 200 to the first flow path and isolate it from the second flow path, and the second three-way valve 360 ​​switches to isolate the heating outlet 100 from the first flow path and connect it to the second flow path. When the switching module 300 is in the second state, the first three-way valve 350 switches to isolate the heating inlet 200 from the first flow path and connect it to the second flow path, and the second three-way valve 360 ​​switches to connect the heating outlet 100 to the first flow path and isolate it from the second flow path.

[0047] The first three-way valve 350 and the second three-way valve 360 ​​each have three connection ports. The state of the switching module 300 can be switched by controlling the connection between the three connection ports. For example, the first three-way valve 350 has a first connection port, a second connection port, and a third connection port. The first connection port is connected to the heating inlet 200, the second connection port is connected to the first flow path, and the third connection port is connected to the second flow path. When the switching module 300 is in the first state, the first connection port is connected to the second connection port, and the heating inlet 200 is connected to the first flow path. When the switching module 300 is in the second state, the first connection port is connected to the third connection port, and the heating inlet 200 is connected to the second flow path.

[0048] The second three-way valve 360 ​​has a fourth connection port, a fifth connection port, and a sixth connection port. The fourth connection port is connected to the heating outlet 100, the fifth connection port is connected to the first flow path, and the sixth connection port is connected to the second flow path. When the switching module 300 is in the first state, the fourth connection port and the sixth connection port are connected, and the heating outlet 100 is connected to the second flow path. When the switching membrane is in the second state, the fourth connection port and the fifth connection port are connected, and the heating outlet 100 is connected to the first flow path.

[0049] In some embodiments, a distributor 700 is provided on both the first flow path and the second flow path. The distributor 700 is used to divert the refrigerant in the first flow path / second flow path into the heat exchange tube section 600 connected to it.

[0050] The distributor 700 is a flow divider connected in parallel between the first flow path and the second flow path, used to divide the refrigerant from the first flow path / second flow path into multiple heat exchange tube sections 600 connected in parallel between the two.

[0051] In some embodiments, the heating outlet 100 is located at the top of the heat exchanger, the heating inlet 200 is located at the bottom of the heat exchanger, and the flow direction of the heat exchange tube section 600 is “N” shaped along the direction from the heating outlet 100 to the heating inlet 200.

[0052] In some embodiments, the switching module 300 is electrically connected to the controller, which can control the switching module 300 to switch between a first state and a second state.

[0053] The controller typically has a pre-stored control program. When the controller executes the control program, it controls the switching module 300 to switch between the first state and the second state in order to extend the frosting time of the heat exchange tube section 600 or to perform defrosting treatment on the heat exchange tube section 600.

[0054] In some embodiments, a temperature sensor is provided on the heat exchanger, and the temperature sensor is electrically connected to the controller. The controller is used to control the switching module 300 to switch between a first state and a second state based on the temperature information fed back by the temperature sensor.

[0055] The temperature sensor on the heat exchanger is located on the heat exchange tube section 600. That is, the control program stored in the controller controls the switching module 300 to switch between the first state and the second state based on the temperature information on the heat exchange tube section 600.

[0056] Specifically, for example:

[0057] The controller switches module 300 between a first state and a second state based on the outdoor temperature and the temperature of heat exchange tube section 600. The specific control program is as follows:

[0058] When the outdoor temperature is greater than A1 and the temperature of the heat exchange tube section 600 is greater than or equal to B1 and less than or equal to B2, the control switching module 300 switches to the second state after holding the first state for C1 time, and switches back to the first state after holding the second state for C1' time, and continues to cycle through switching.

[0059] When the outdoor temperature is greater than A2 and less than or equal to A1, and the temperature of heat exchange tube section 600 is greater than or equal to B3 and less than or equal to B4, the control switching module 300 switches to the second state after holding the first state for C2 time, and switches back to the first state after holding the second state for C2' time, and continues to cycle and switch.

[0060] When the outdoor temperature is greater than A3 and less than or equal to A2, and the temperature of heat exchange tube section 600 is greater than or equal to B5 and less than or equal to B6, the control switching module 300 switches to the second state after holding the first state for C3 time, and switches back to the first state after holding the second state for C3' time, and continues to cycle and switch.

[0061] When the outdoor temperature is less than A1 and the temperature of heat exchange tube section 600 is greater than or equal to B7 and less than or equal to B8, the control switching module 300 switches to the second state after holding the first state for C4 time, and switches back to the first state after holding the second state for C4' time, and continues to cycle through switching.

[0062] Where A1, A2, and A3 represent outdoor ambient temperatures in °C, and -25 °C ≤ A3 ≤ A2 ≤ A1 ≤ 20 °C;

[0063] B1, B2, B3, B4, B5, B6, B7, B8 represent the coil temperature judgment conditions, in °C. The values ​​are: -25℃≤B1≤B2≤20℃; -25℃≤B3≤B4≤20℃; -25℃≤B5≤B6≤20℃; -25℃≤B7≤B8≤20℃.

[0064] C1, C2, C3, C4, C1', C2', C3', C4' represent time judgment conditions, in minutes: 0 ≤ C4 ≤ C3 ≤ C2 ≤ C1 ≤ 120 min; 0 ≤ C4' ≤ C3' ≤ C2' ≤ C1' ≤ 120 min.

[0065] In some embodiments, the present invention also provides an outdoor unit, which includes a heat exchanger formed by the solution of at least one of the above embodiments. Therefore, the outdoor unit has at least one beneficial effect of the above embodiments, which will not be described in detail here.

[0066] In some embodiments, the present invention provides an air conditioner that includes the outdoor unit of the above embodiments. Since the air conditioner has the outdoor unit of the above embodiments, and the outdoor unit of the above embodiments uses the aforementioned heat exchanger, the air conditioner has at least all the beneficial effects of the outdoor unit that uses the aforementioned heat exchanger, which will not be described in detail here.

[0067] In some embodiments, the air conditioner has a controller electrically connected to the switching module 300 for controlling the switching module 300 to switch between a first state and a second state.

[0068] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made based on the contents of the present utility model specification and drawings under the application concept of the present utility model, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A heat exchanger, characterized in that, include: At least two parallel heat exchanger tube sections; A flow direction switching component is connected to each of the heat exchange tube segments. The flow direction switching component is used to switch the flow direction of the refrigerant in the heat exchange tube segment between a first flow direction and a second flow direction, wherein the first flow direction and the second flow direction are opposite to each other.

2. The heat exchanger according to claim 1, characterized in that, The heat exchanger also includes a heating inlet and a heating outlet. The flow direction switching component includes a first flow path, a second flow path, and a switching module. The first flow path and the second flow path are connected in parallel between the heating inlet and the heating outlet. At least two heat exchange tube segments are connected in parallel between the first flow path and the second flow path. The flow direction switching module has a first state and a second state that can be switched between each other. When the switching module is in the first state, the heating inlet is connected to the first flow path and isolated from the second flow path, and the heating outlet is isolated from the first flow path and connected to the second flow path. When the switching module is in the second state, the heating inlet is isolated from the first flow path and connected to the second flow path, and the heating outlet is connected to the first flow path and isolated from the second flow path.

3. The heat exchanger according to claim 2, characterized in that, The switching module includes a first valve, a second valve, a third valve, and a fourth valve. The first valve is connected between the first flow path and the heating inlet, the second valve is connected between the first flow path and the heating outlet, the third valve is connected between the second flow path and the heating inlet, and the fourth valve is connected between the second flow path and the heating outlet. When the switching module is in the first state, the first valve is open, the second valve is closed, the third valve is closed, and the fourth valve is open; When the switching module is in the second state, the first valve is closed, the second valve is open, the third valve is open, and the fourth valve is closed.

4. The heat exchanger according to claim 2, characterized in that, The switching module includes a first three-way valve and a second three-way valve. The first three-way valve is connected to the heating inlet, the first flow path, and the second flow path, respectively. The second three-way valve is connected to the heating outlet, the end of the first flow path away from the heating inlet, and the end of the second flow path away from the heating inlet, respectively. When the switching module is in the first state, the first three-way valve switches to connect the heating inlet to the first flow path and isolate it from the second flow path, and the second three-way valve switches to isolate the heating outlet from the first flow path and connect it to the second flow path. When the switching module is in the second state, the first three-way valve switches to isolate the heating inlet from the first flow path and connect it to the second flow path, and the second three-way valve switches to connect the heating outlet to the first flow path and isolate it from the second flow path.

5. The heat exchanger according to claim 2, characterized in that, Both the first flow path and the second flow path are equipped with a flow divider, which is used to divert the refrigerant in the first flow path / second flow path into the heat exchange tube section connected to it.

6. The heat exchanger according to claim 2, characterized in that, The heating outlet is located at the top of the heat exchanger, and the heating inlet is located at the bottom of the heat exchanger. Along the direction from the heating outlet to the heating inlet, the flow direction of the heat exchange tube section is "N" shaped.

7. The heat exchanger according to claim 2, characterized in that, The switching module is electrically connected to the controller, which can control the switching module to switch between the first state and the second state.

8. The heat exchanger according to claim 7, characterized in that, The heat exchanger is equipped with a temperature sensor, which is electrically connected to the controller. The controller is used to control the switching module to switch between the first state and the second state based on the temperature information fed back by the temperature sensor.

9. An outdoor unit, characterized in that, Includes the heat exchanger as described in any one of claims 1-8.

10. An air conditioner, characterized in that, Includes the outdoor unit as described in claim 9.

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