Heat exchanger, outdoor unit and air conditioner

Abstract

The heat exchanger comprises a heating refrigerant input part, a heat exchange pipe section and a heating device, an inlet of the heating device is communicated with the heating refrigerant input part, and an outlet of the heating device is communicated with one end of the heat exchange pipe section. The heating device is used for heating a refrigerant flowing to the heat exchange pipe section from the heating refrigerant input part; the heating device is used for heating the refrigerant flowing from the heating refrigerant input part to the heat exchange pipe section, and frosting caused by the fact that the temperature of the refrigerant at an inlet of the heat exchange pipe section is too low is avoided.

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 slippage during evaporation or condensation. If this phenomenon occurs in the heating mode of an air conditioner, there will be an excessive temperature difference between the inlet and outlet of the outdoor heat exchanger; that is, the inlet temperature is lower and the outlet temperature is higher. Consequently, at lower operating temperatures, the refrigerant in the heat exchanger is prone to frost and ice formation at the coil inlet after being split, leading to deterioration of outdoor heat exchange and affecting 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 where non-azeotropic refrigerants easily cause 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] Heating refrigerant input section;

[0006] Heat exchanger tube section;

[0007] A heating device, wherein the inlet of the heating device is connected to the heating refrigerant input section, and the outlet of the heating device is connected to one end of the heat exchange tube section, and the heating device is used to heat the refrigerant flowing from the heating refrigerant input section to the heat exchange tube section.

[0008] In some embodiments of this utility model, the heat exchanger further includes a heating refrigerant output section, the heating device is a regenerator, the regenerator has a first heat exchange channel and a second heat exchange channel, the two ends of the first heat exchange channel are a first inlet and a first outlet respectively, the two ends of the second heat exchange channel are a second inlet and a second outlet respectively, the first inlet is connected to the heating refrigerant input section, the first outlet is connected to one end of the heat exchange tube section, the second inlet is connected to the other end of the heat exchange tube section, and the second outlet is connected to the heating refrigerant output section.

[0009] In some embodiments of this utility model, a first flow path is connected between the second outlet and the heating refrigerant output section, and a first one-way valve is provided between the first flow path and the heating output section. The first one-way valve is configured to allow refrigerant to flow only from the second outlet to the heating refrigerant output section.

[0010] A second flow path is provided between the heating refrigerant output section and the second inlet, and a second one-way valve is provided between the second flow path and the heating refrigerant output section. The second one-way valve is configured to allow refrigerant to flow into the second flow path only from the heating refrigerant output section, and the outlet of the heat exchange tube section is connected to the second flow path.

[0011] In some embodiments of this utility model, the heat exchanger further includes a first three-way valve, a first flow path is provided between the second outlet and the heating refrigerant output section, a second flow path is provided between the heating refrigerant output section and the second inlet, the first flow path, the second flow path and the heating refrigerant output section are respectively connected to the three openings of the first three-way valve, and one end of the heat exchange tube section is connected to the second flow path;

[0012] The first three-way valve is configured such that when the air conditioner is in heating mode, the first three-way valve switches to a first state, so that the heating refrigerant output section is connected to the first flow path and isolated from the second flow path;

[0013] When the air conditioner is in cooling mode, the first three-way valve switches to the second state, so that the heating refrigerant output section is connected to the second flow path and isolated from the first flow path.

[0014] In some embodiments of this utility model, the heating device includes a heating element and a heat exchange element. The heat exchange element has a cavity. The inlet of the heat exchange element is connected to the heating refrigerant input element, and the outlet of the heat exchange element is connected to one end of the heat exchange tube section. The heating element is used to heat the heat exchange element.

[0015] In some embodiments of this utility model, the heat exchanger includes a third flow path and a fourth flow path. The third flow path is connected to one end of the heat exchange tube section. A third one-way valve is provided between the third flow path and the heating refrigerant inlet. The third one-way valve is configured to allow refrigerant to flow only from the heat exchange tube section to the heating refrigerant inlet.

[0016] The outlet of the heat exchange section is connected to the third flow path, and a fourth one-way valve is provided between the inlet of the heat exchange section and the heating refrigerant input section. The fourth one-way valve is configured to allow the refrigerant to flow only from the heating refrigerant input section to the inlet of the heat exchange section.

[0017] The heat exchanger also includes a heating refrigerant output section, which is connected to the fourth flow path, and the other end of the heat exchange tube section is connected to the fourth flow path.

[0018] In some embodiments of this utility model, the heat exchanger includes a third flow path and a fourth flow path. The third flow path is connected to one end of the heat exchange tube section, and the outlet of the heat exchange section is connected to the third flow path. The heat exchanger also includes a second three-way valve, and the first flow path, the inlet of the heat exchange section, and the heating input section are respectively connected to the three openings of the second three-way valve.

[0019] The second three-way valve is configured to switch to the first state when the air conditioner is in heating mode, so that the heating input section is connected to the inlet of the heat exchange section and isolated from the first flow path;

[0020] When the air conditioner is in cooling mode, it switches to the second state, so that the heating input section is connected to the first flow path and isolated from the inlet of the heat exchange section;

[0021] The heat exchanger also includes a heating refrigerant output section, the heating refrigerant input section is connected to the fourth flow path, and the other end of the heat exchange tube section is connected to the fourth flow path.

[0022] In some embodiments of this utility model, an outdoor unit is also provided, which includes the heat exchanger described above.

[0023] In some embodiments of this utility model, the outdoor unit further includes a compressor liquid storage tank, and the heating device includes a heating part and a heat exchange part, wherein the heating part is the compressor liquid storage tank, and the heat exchange part is wound around the compressor liquid storage tank.

[0024] In some embodiments of this utility model, an air conditioner is also provided, including the outdoor unit described above.

[0025] The present invention provides a heat exchanger, an outdoor unit, and an air conditioner. The heat exchanger uses a heating device installed between the heating refrigerant inlet and the heat exchange tube section to heat the refrigerant flowing from the heating refrigerant inlet to the heat exchange tube section, thereby preventing frost formation due to excessively low refrigerant temperature at the inlet of the heat exchange tube section. Attached Figure Description

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of a heat exchanger structure in the prior art;

[0028] Figure 2 This is a schematic diagram of the structure of a heat exchanger according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the heat exchanger according to the second embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the heat exchanger according to the third embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the heat exchanger according to the fourth embodiment of the present invention.

[0032] Reference numerals: 100, Heating refrigerant outlet; 200, Heating refrigerant inlet; 300, Heat exchange tube section; 310, Flow divider; 400, Heat exchanger; 410, First heat exchange channel; 420, Second heat exchange channel; 510, First flow path; 511, First check valve; 520, Second flow path; 521, Second check valve; 530, First three-way valve; 610, Heat exchange section; 620, Heating section; 710, Third flow path; 720, Fourth flow path; 810, Third check valve; 820, Fourth check valve; 830, Second three-way valve. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] like Figures 1-5 As shown, this utility model provides a heat exchanger 400, including a heating refrigerant input section 200, a heat exchange tube section 300, and a heating device. The inlet of the heating device is connected to the heating refrigerant input section 200, and the outlet of the heating device is connected to one end of the heat exchange tube section 300. The heating device is used to heat the refrigerant flowing from the heating refrigerant input section 200 to the heat exchange tube section 300.

[0038] Among them, the heat exchange tube section 300 is a single tube structure in the heat exchanger 400 used for heat exchange between the refrigerant and the air. It generally has two ports, one for the refrigerant to flow in and one for the refrigerant to flow out.

[0039] 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 300 of the outdoor heat exchanger 400 is too large. For example, the inlet temperature of the heat exchange tube section 300 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℃. This makes it easy for frost to form at the inlet of the heat exchange tube section 300.

[0040] For non-azeotropic refrigerants, this invention provides a heating device between the heating refrigerant inlet 200 and the heat exchange tube section 300. The heating device heats the refrigerant flowing from the heating refrigerant inlet 200 to the heat exchange tube section 300, thus preventing frost formation due to excessively low refrigerant temperature at the inlet of the heat exchange tube section 300.

[0041] In some embodiments, the heat exchanger 400 further includes a heating refrigerant output section 100, and the heating device is a regenerator. The regenerator has a first heat exchange channel 410 and a second heat exchange channel 420. The two ends of the first heat exchange channel 410 are a first inlet and a first outlet, respectively. The two ends of the second heat exchange channel 420 are a second inlet and a second outlet, respectively. The first inlet is connected to the heating refrigerant input section 200, the first outlet is connected to one end of the heat exchange tube section 300, the second inlet is connected to the other end of the heat exchange tube section 300, and the second outlet is connected to the heating refrigerant output section 100.

[0042] Among them, the heating refrigerant output section 100 is the outlet of the refrigerant in the heat exchanger 400 when the air conditioner is in heating mode.

[0043] That is, the unexchanged refrigerant flowing out of the heating refrigerant inlet 200 enters the first heat exchange channel 410 through the first inlet, and then flows out through the first outlet into the heat exchange tube section 300 after passing through the first heat exchange channel 410; the refrigerant after heat exchange in the heat exchange tube section 300 enters the second heat exchange channel 420 through the second inlet, and then flows out through the second outlet into the heating refrigerant outlet 100 after passing through the second heat exchange channel 420.

[0044] It is understandable that by collecting the refrigerant after heat exchange back to the regenerator, and exchanging heat between the refrigerant after heat exchange and the refrigerant that has not been heat exchanged, the temperature of the refrigerant entering the heat exchange tube section 300 is increased, thus preventing the temperature from being too low and causing frost to form at the inlet of the heat exchange tube section 300.

[0045] In some embodiments, the heat exchanger 400 is provided with a plurality of heat exchange tube segments 300, which are connected in parallel between the first outlet and the second inlet of the regenerator.

[0046] In some embodiments, a splitter 310 is provided between the first outlet and the plurality of heat exchange tube sections 300.

[0047] In some embodiments, a first flow path 510 is connected between the second outlet and the heating refrigerant output section 100, and a first one-way valve 511 is provided between the first flow path 510 and the heating output section. The first one-way valve 511 is configured to allow refrigerant to flow only from the second outlet to the heating refrigerant output section 100.

[0048] A second flow path 520 is provided between the heating refrigerant output section 100 and the second inlet. A second one-way valve 521 is provided between the second flow path 520 and the heating refrigerant output section 100. The second one-way valve 521 is configured to allow refrigerant to flow into the second flow path 520 only from the heating refrigerant output section 100. The outlet of the heat exchange tube section 300 is connected to the second flow path 520.

[0049] Among them, the heating refrigerant output section 100 is the cooling refrigerant input section, and the heating refrigerant input section 200 is the cooling refrigerant output section. That is, when the air conditioner switches from heating mode to cooling mode, the refrigerant enters the heat exchanger 400 from the cooling refrigerant input section (original heating refrigerant output section 100) and flows out of the heat exchanger 400 from the cooling refrigerant output section (original heating refrigerant input section 200).

[0050] It is understandable that setting up the first flow path 510, the second flow path 520, the first one-way valve 511, and the second one-way valve 521 can prevent the two modes from being unable to switch normally during heating and cooling due to the setting of the regenerator.

[0051] In some embodiments, the heat exchanger 400 further includes a first three-way valve 530, a first flow path 510 is provided between the second outlet and the heating refrigerant output section 100, a second flow path 520 is provided between the heating refrigerant output section 100 and the second inlet, the first flow path 510, the second flow path 520 and the heating refrigerant output section 100 are respectively connected to the three openings of the first three-way valve 530, and one end of the heat exchange tube section 300 is connected to the second flow path 520;

[0052] The first three-way valve 530 is configured such that when the air conditioner is in heating mode, the first three-way valve 530 switches to the first state, so that the heating refrigerant output section 100 is connected to the first flow path 510 and isolated from the second flow path 520.

[0053] When the air conditioner is in cooling mode, the first three-way valve 530 switches to the second state, so that the heating refrigerant output section 100 is connected to the second flow path 520 and isolated from the first flow path 510.

[0054] It is understandable that by switching between the first three-way valve 530 and the first state, the flow direction of the heat exchanger 400 can be smoothly switched between the heating flow direction and the cooling flow direction.

[0055] In some embodiments, the heating device includes a heating element 620 and a heat exchange element 610. The heat exchange element 610 has a cavity, the inlet of the heat exchange element 610 is connected to the heating refrigerant input section 200, and the outlet of the heat exchange element 610 is connected to one end of the heat exchange tube section 300. The heating element 620 is used to heat the heat exchange element 610.

[0056] It is understandable that by using the heating element 620 as a heat source and the heat exchange element 610 as a heat exchange channel, the temperature of the refrigerant entering the heat exchange tube section 300 is increased, thus preventing frost from forming at the inlet of the heat exchange tube section 300 due to excessively low temperature.

[0057] In some embodiments, the heating element 620 may be an electric heating wire.

[0058] In some embodiments, the heat exchanger 400 includes a third flow path 710 and a fourth flow path 720. The third flow path 710 is connected to one end of the heat exchange tube section 300. A third one-way valve 810 is provided between the third flow path 710 and the heating refrigerant inlet 200. The third one-way valve 810 is configured to allow refrigerant to flow only from the heat exchange tube section 300 to the heating refrigerant inlet 200. The outlet of the heat exchange section 610 is connected to the third flow path 710. A fourth one-way valve 820 is provided between the inlet of the heat exchange section 610 and the heating refrigerant inlet 200. The fourth one-way valve 820 is configured to allow refrigerant to flow only from the heating refrigerant inlet 200 to the inlet of the heat exchange section 610. The heat exchanger 400 also includes a heating refrigerant outlet 100, which is connected to the fourth flow path 720. The other end of the heat exchange tube section 300 is also connected to the fourth flow path 720.

[0059] In this embodiment, the heating refrigerant output section 100 is the cooling refrigerant input section, and the heating refrigerant input section 200 is the cooling refrigerant output section. That is, when the air conditioner switches from heating mode to cooling mode, the refrigerant enters the heat exchanger 400 from the cooling refrigerant input section (formerly the heating refrigerant output section 100) and flows out of the heat exchanger 400 from the cooling refrigerant output section (formerly the heating refrigerant input section 200). Therefore, in this embodiment, in heating mode, the refrigerant enters the heat exchange tube section 300 from the third flow path 710, undergoes heat exchange in the heat exchange tube section 300, enters the fourth flow path 720, and finally flows out of the heat exchanger 400 through the heating output section. In cooling mode, the refrigerant enters the heat exchange tube section 300 from the fourth flow path 720, undergoes heat exchange in the heat exchange tube section 300, enters the third flow path 710, and finally flows out of the heat exchanger 400 through the cooling refrigerant output section (formerly the heating refrigerant input section 200).

[0060] Therefore, by setting the third flow path 710, the fourth flow path 720, the third one-way valve 810 and the fourth one-way valve 820, it can be ensured that the flow paths will not interfere when the heat exchanger 400 switches between heating mode and cooling mode.

[0061] In some embodiments, the heat exchanger 400 includes a third flow path 710 and a fourth flow path 720. The third flow path 710 is connected to one end of the heat exchange tube section 300, and the outlet of the heat exchange section 610 is connected to the third flow path 710. The heat exchanger 400 also includes a second three-way valve 830, and the first flow path 510, the inlet of the heat exchange section 610, and the heating input section are respectively connected to the three openings of the second three-way valve 830.

[0062] The second three-way valve 830 is configured to: switch to a first state when the air conditioner is in heating mode, connecting the heating input section to the inlet of the heat exchange section 610 and isolating it from the first flow path 510; and switch to a second state when the air conditioner is in cooling mode, connecting the heating input section to the first flow path 510 and isolating it from the inlet of the heat exchange section 610. The heat exchanger 400 also includes a heating refrigerant output section 100, a heating refrigerant input section 200 connected to a fourth flow path 720, and the other end of the heat exchange tube section 300 connected to the fourth flow path 720.

[0063] It is understandable that by switching between the first three-way valve 530 and the first state, the flow direction of the heat exchanger 400 can be smoothly switched between the heating flow direction and the cooling flow direction.

[0064] In some embodiments, a plurality of heat exchange tube segments 300 are connected in parallel between the third flow path 710 and the fourth flow path 720, and a flow divider 310 is provided between the third flow path 710 and the plurality of heat exchange tube segments 300.

[0065] In some embodiments, the present invention also provides an outdoor unit, which includes a heat exchanger 400 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 outdoor unit further includes a compressor receiver tank, and the heating device includes a heating element 620 and a heat exchange element 610, wherein the heating element 620 is the compressor receiver tank, and the heat exchange element 610 is wound around the compressor receiver tank.

[0067] The refrigerant in the compressor receiver tank has a high temperature and is itself at a certain temperature. When the heat exchange section 610 is wrapped around the compressor receiver tank, it can heat the refrigerant in the heat exchange section 610, thereby increasing the temperature of the refrigerant entering the heat exchange tube section 300.

[0068] In some embodiments, the present invention provides an air conditioner that includes the outdoor unit of the above embodiment. Since the air conditioner has the outdoor unit of the above embodiment, and the outdoor unit of the above embodiment uses the aforementioned heat exchanger 400, the air conditioner has at least all the beneficial effects of the outdoor unit that uses the aforementioned heat exchanger 400, which will not be described in detail here.

[0069] 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: Heating refrigerant input section; Heat exchanger tube section; A heating device, wherein the inlet of the heating device is connected to the heating refrigerant input section, and the outlet of the heating device is connected to one end of the heat exchange tube section, and the heating device is used to heat the refrigerant flowing from the heating refrigerant input section to the heat exchange tube section.

2. The heat exchanger according to claim 1, characterized in that, The heat exchanger also includes a heating refrigerant output section. The heating device is a regenerator. The regenerator has a first heat exchange channel and a second heat exchange channel. The two ends of the first heat exchange channel are a first inlet and a first outlet, respectively. The two ends of the second heat exchange channel are a second inlet and a second outlet, respectively. The first inlet is connected to the heating refrigerant input section. The first outlet is connected to one end of the heat exchange tube section. The second inlet is connected to the other end of the heat exchange tube section. The second outlet is connected to the heating refrigerant output section.

3. The heat exchanger according to claim 2, characterized in that, A first flow path is connected between the second outlet and the heating refrigerant output section. A first one-way valve is provided between the first flow path and the heating refrigerant output section. The first one-way valve is configured to allow refrigerant to flow only from the second outlet to the heating refrigerant output section. A second flow path is provided between the heating refrigerant output section and the second inlet, and a second one-way valve is provided between the second flow path and the heating refrigerant output section. The second one-way valve is configured to allow refrigerant to flow into the second flow path only from the heating refrigerant output section, and the outlet of the heat exchange tube section is connected to the second flow path.

4. The heat exchanger according to claim 2, characterized in that, The heat exchanger also includes a first three-way valve, a first flow path is provided between the second outlet and the heating refrigerant output section, a second flow path is provided between the heating refrigerant output section and the second inlet, the first flow path, the second flow path and the heating refrigerant output section are respectively connected to the three openings of the first three-way valve, and one end of the heat exchange tube section is connected to the second flow path; The first three-way valve is configured such that when the air conditioner is in heating mode, the first three-way valve switches to a first state, so that the heating refrigerant output section is connected to the first flow path and isolated from the second flow path; When the air conditioner is in cooling mode, the first three-way valve switches to the second state, so that the heating refrigerant output section is connected to the second flow path and isolated from the first flow path.

5. The heat exchanger according to claim 1, characterized in that, The heating device includes a heating element and a heat exchange element. The heat exchange element has a cavity. The inlet of the heat exchange element is connected to the heating refrigerant input element, and the outlet of the heat exchange element is connected to one end of the heat exchange tube section. The heating element is used to heat the heat exchange element.

6. The heat exchanger according to claim 5, characterized in that, The heat exchanger includes a third flow path and a fourth flow path. The third flow path is connected to one end of the heat exchange tube section. A third one-way valve is provided between the third flow path and the heating refrigerant inlet. The third one-way valve is configured to allow refrigerant to flow only from the heat exchange tube section to the heating refrigerant inlet. The outlet of the heat exchange section is connected to the third flow path, and a fourth one-way valve is provided between the inlet of the heat exchange section and the heating refrigerant input section. The fourth one-way valve is configured to allow the refrigerant to flow only from the heating refrigerant input section to the inlet of the heat exchange section. The heat exchanger also includes a heating refrigerant output section, which is connected to the fourth flow path, and the other end of the heat exchange tube section is connected to the fourth flow path.

7. The heat exchanger according to claim 5, characterized in that, The heat exchanger includes a third flow path and a fourth flow path. The third flow path is connected to one end of the heat exchange tube section, and the outlet of the heat exchange section is connected to the third flow path. The heat exchanger also includes a second three-way valve. The third flow path, the inlet of the heat exchange section, and the heating refrigerant input section are respectively connected to the three openings of the second three-way valve. The second three-way valve is configured to switch to the first state when the air conditioner is in heating mode, so that the heating refrigerant input section is connected to the inlet of the heat exchange section and isolated from the third flow path; When the air conditioner is in cooling mode, it switches to the second state, so that the heating refrigerant input section is connected to the third flow path and isolated from the inlet of the heat exchange section; The heat exchanger also includes a heating refrigerant output section, the heating refrigerant input section is connected to the fourth flow path, and the other end of the heat exchange tube section is connected to the fourth flow path.

8. An outdoor unit, characterized in that, Includes the heat exchanger as described in any one of claims 1-7.

9. The outdoor unit according to claim 8, characterized in that, The outdoor unit also includes a compressor liquid storage tank, and the heating device includes a heating element and a heat exchange element. The heating element is the compressor liquid storage tank, and the heat exchange element is wound around the compressor liquid storage tank.

10. An air conditioner, characterized in that, Includes the outdoor unit as described in any one of claims 8-9.

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