CN220648451U - Heat exchange device, outdoor unit and air conditioner - Google Patents

Abstract

The application relates to intelligent household electrical appliances technical field discloses a heat transfer device, is applied to the off-premises station of air conditioner, includes: a variable heat exchanger having a plurality of heat exchange channels; the refrigerant pipeline assembly is controllably communicated with different heat exchange channels to form heat exchange flow paths with different flow path lengths in the convertible heater; the on-off valve assembly is arranged on the refrigerant pipeline assembly and used for controlling the on-off of the refrigerant pipeline assembly and different heat exchange channels so as to change the flow path length of a heat exchange flow path through which the refrigerant flows in the convertible heater. And then the heat exchange area of the variable heat exchanger is changed so as to be suitable for different modes of air conditioner operation. Therefore, the change of a refrigerant flow path is not required to be controlled through the one-way valve, and the possibility of heat leakage is further reduced. In addition, even if the operation pressure of the used refrigerant is low, abnormal sound is not generated. The application also discloses an outdoor unit and an air conditioner.

Description

Heat exchange device, outdoor unit and air conditioner

Technical Field

The application relates to the technical field of intelligent household appliances, for example, to a heat exchange device, an outdoor unit and an air conditioner.

Background

The refrigerant charge of R290 is relatively limited. When the air conditioner is in a refrigerating and heating state under the condition of insufficient refrigerant quantity, the heat exchange area required by the outdoor unit is unequal. When the air conditioner operates for refrigeration, the heat exchange area of the outdoor unit should be properly reduced so as to improve the refrigeration heat exchange efficiency. When the air conditioner is in operation for heating, the heat exchange area of the outdoor unit needs to be properly increased so as to reduce the outdoor frosting speed and improve the experience.

Disclosed in the related art is a heat exchanger including: the first end of the first heat exchange passage is communicated with the first main pipeline, and the second end of the first heat exchange passage is communicated with the first flow dividing element; a second heat exchange passage, the first end of which is communicated with the second flow dividing element, and the second end of which is communicated with the third flow dividing element; a third heat exchange passage, the first end of which is communicated with the second flow dividing element, and the second end of which is communicated with the fourth flow dividing element; the fourth flow dividing element is communicated with the second main pipeline; a fourth heat exchange passage having a first end connected to the second flow dividing element and a second end connected to the fourth flow dividing element; a first bypass line having a first end in communication with the first flow splitting element and a second end in communication with the second flow splitting element; the first bypass pipe is provided with a first one-way valve, and the conducting direction of the first one-way valve is limited to flow from the first flow dividing element to the second flow dividing element; a second bypass line having a first end in communication with the first bypass element and a second end in communication with the third bypass element; the second bypass line is provided with a second one-way valve, the conduction direction of which is defined to flow from the third flow dividing element to the first flow dividing element; a third bypass line having a first end in communication with the third flow splitting element and a second end in communication with the fourth flow splitting element; the third bypass line is provided with a third one-way valve, the direction of conduction of which is defined to flow from the third flow dividing element to the fourth flow dividing element.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

related art changes the cooling and heating flow path through a check valve. Under the condition of low-frequency operation of the air conditioner, the system pressure is low, and the check valve has the possibility of heat leakage. This phenomenon is more pronounced if the refrigerant operating pressure used is low, and also abnormal sounds are generated.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides a heat exchange device, an outdoor unit and an air conditioner, so as to reduce the possibility of system heat leakage.

In some embodiments, the heat exchange device is applied to an air conditioner, and comprises: a variable heat exchanger having a plurality of heat exchange channels; the refrigerant pipeline assembly is controllably communicated with different heat exchange channels to form heat exchange flow paths with different flow path lengths in the convertible heater; the on-off valve assembly is arranged on the refrigerant pipeline assembly and used for controlling the on-off of the refrigerant pipeline assembly and different heat exchange channels so as to change the flow path length of a heat exchange flow path through which the refrigerant flows in the convertible heater.

In some embodiments, the outdoor unit includes: a compressor, a four-way valve, an outdoor heat exchanger and a heat exchange device as described above; the outdoor heat exchanger is provided with a first refrigerant port communicated with the indoor unit; the pipeline communicated with the first refrigerant port is connected with the heat exchange device, so that heat exchange flow paths with different flow path lengths of the variable heat exchanger of the heat exchange device are connected with the pipeline communicated with the first refrigerant port, and the flow path length of the heat exchange flow path through which the refrigerant flows in the variable heat exchanger is changed.

In some embodiments, the air conditioner includes: an indoor unit and an outdoor unit as described above; the indoor unit includes: an indoor heat exchanger; the compressor, the four-way valve, the outdoor heat exchanger and the indoor heat exchanger are sequentially communicated to form a refrigerant circulation loop; the heat exchange device is connected to a pipeline which is communicated with the outdoor heat exchanger and the indoor heat exchanger, so that heat exchange flow paths with different flow path lengths of the variable heat exchanger of the heat exchange device are connected to a pipeline which is communicated with the first refrigerant port, and the flow path length of the heat exchange flow path through which the refrigerant flows in the variable heat exchanger is changed.

The heat exchange device, the outdoor unit and the air conditioner provided by the embodiment of the disclosure can realize the following technical effects:

the heat exchanger is provided with a plurality of heat exchange channels, and the refrigerant pipeline assembly can be controlled to be communicated with the plurality of heat exchange channels, so that heat exchange flow paths with different flow path lengths are formed in the heat exchanger. The on-off valve assembly is arranged on the refrigerant pipeline assembly and further controls on-off of the refrigerant pipeline and the plurality of heat exchange channels. In this way, the flow path length of the heat exchange flow path through which the refrigerant flows in the switchable heater can be changed. Thus, the heat exchange area of the variable heat exchanger is changed to be suitable for different modes of air conditioner operation. The change of a refrigerant flow path is not required to be controlled through a one-way valve, so that the possibility of heat leakage is reduced. In addition, even if the operation pressure of the used refrigerant is low, abnormal sound is not generated.

It should be noted that the information disclosed in the foregoing background section is only for enhancing understanding of the background of the present application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

fig. 1 is a schematic structural view of a heat exchange device provided in an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a refrigerant flow direction in the heat exchange device when the air conditioner is in operation for heating according to the embodiment of the present disclosure;

fig. 3 is a schematic diagram of a refrigerant flow direction in a heat exchange device before an air conditioner operates for cooling according to an embodiment of the present disclosure;

FIG. 4 is an illustration of the flow direction of refrigerant in a heat exchange device when the air conditioner is operating in refrigeration, provided by an embodiment of the present disclosure;

fig. 5 is a schematic structural view of an outdoor unit according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of a refrigerant flow direction in an air conditioner when the air conditioner is operating to heat according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram of a refrigerant flow direction in an air conditioner before the air conditioner operates for cooling according to an embodiment of the present disclosure;

fig. 8 is a schematic diagram of a refrigerant flow direction in an air conditioner when the air conditioner is operating for cooling according to an embodiment of the present disclosure.

Reference numerals:

1. a heat exchange device;

110. a switchable heat exchanger; 111. a first heat exchange conduit; 112. a second heat exchange conduit; 120. a refrigerant line assembly; 121. a first refrigerant pipe; 122. a second refrigerant pipe; 123. a third refrigerant pipe; 130. an on-off valve assembly; 131. a first on-off valve; 132. a second on-off valve; 133. a reversing valve; 140. a communication passage;

2. an outdoor unit;

210. a compressor; 220. a four-way valve; 230. an outdoor heat exchanger; 240. an outdoor air supply system;

3. an indoor unit;

310. an indoor heat exchanger; 320. an indoor air supply system; 330. a throttle device;

4. a first connection pipe; 5. a second connection pipe; 6. a third connection pipe; 7. a fourth connection pipe; 8. and a fifth connecting pipe.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe embodiments of the present disclosure and embodiments thereof and are not intended to limit the indicated device, element, or component to a particular orientation or to be constructed and operated in a particular orientation. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the embodiments of the present disclosure will be understood by those of ordinary skill in the art in view of the specific circumstances.

In addition, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the embodiments of the present disclosure may be understood by those of ordinary skill in the art according to specific circumstances.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other.

Referring to fig. 1, an embodiment of the present disclosure provides a heat exchange device 1, including: a switchable heater 110, a refrigerant line assembly 120 and an on-off valve assembly 130. The variable heat exchanger 110 has a plurality of heat exchange channels. The refrigerant line assembly 120 is controllably in communication with different heat exchange channels to receive external refrigerant and form heat exchange flow paths of different flow path lengths within the switchable heater. Such as receiving refrigerant output from an outdoor heat exchanger, a compressor, or an indoor heat exchanger. The source of the external refrigerant received by the variable heat exchanger 110 and the refrigerant line assembly 120 is determined according to the mode of operation of the air conditioner. The on-off valve assembly 130 is disposed on the refrigerant pipeline assembly 120, and is capable of controlling on-off of the refrigerant pipeline assembly 120 and the plurality of heat exchange channels, so as to change the flow path length of the heat exchange flow path through which the refrigerant flows in the switchable heater 110.

With the heat exchange device 1 provided in the embodiments of the present disclosure, the variable heat exchanger 110 has a plurality of heat exchange channels, and the refrigerant pipeline assembly 120 is controllable to communicate with the plurality of heat exchange channels, so as to form heat exchange flow paths with different flow path lengths in the variable heat exchanger. The on-off valve assembly 130 is disposed on the refrigerant pipeline assembly 120, so as to control on-off of the refrigerant pipeline and the heat exchange channels. In this way, the flow path length of the heat exchange flow path through which the refrigerant flows in the switchable heater 110 can be changed. In this way, the heat exchange area of the variable heat exchanger 110 is changed to be suitable for different modes of air conditioner operation. The change of a refrigerant flow path is not required to be controlled through a one-way valve, so that the possibility of heat leakage is reduced. In addition, even if the operation pressure of the used refrigerant is low, abnormal sound is not generated.

Optionally, the plurality of heat exchange channels of the switchable heater 110 comprises: a first heat exchange tube 111 and a second heat exchange tube 112. Wherein the length of the second heat exchange tube 112 is smaller than the length of the first heat exchange tube 111. Optionally, the first heat exchanging pipe 111 is disposed along the height direction of the switchable heater 110. The second heat exchanging pipe 112 is disposed along a lateral direction of the switchable heater 110. Wherein the lateral dimension of the switchable heat sink 110 is smaller than the height dimension. Alternatively, the first heat exchange tube 111 may be a straight tube or a spiral tube.

Optionally, the switchable heater 110 comprises a housing. The housing is provided with communication holes corresponding to both ends of the first heat exchange pipe 111 and corresponding to both ends of the second heat exchange pipe 112.

A first end (lower end shown in fig. 1) of the first heat exchange pipe 111 is connected to the indoor unit 3 through a refrigerant pipe assembly. When the on-off valve assembly 130 controls the communication of some of the refrigerant pipe assemblies 120, the first heat exchange pipe 111 can communicate with the indoor unit 3. The first end (right end shown in fig. 1) of the second heat exchange pipe 112 is connected to the second end (upper end shown in fig. 1) of the first heat exchange pipe 111 through a refrigerant pipe assembly. When the on-off valve assembly 130 controls the communication of some of the refrigerant pipe assemblies 120, the first end of the second heat exchanging pipe 112 can be communicated with the indoor unit 3, or the first end of the second heat exchanging pipe 112 can be communicated with the second end (the upper end as illustrated in fig. 1) of the first heat exchanging pipe 111. A second end (left end as viewed in fig. 1) of the second heat exchange tube 112 is adapted to communicate with the outdoor heat exchanger 230.

Optionally, the first heat exchanging pipe 111 is disposed along the height direction of the switchable heater 110. The second heat exchanging pipe 112 is disposed along a lateral direction of the switchable heater 110. Wherein the lateral dimension of the switchable heat sink 110 is smaller than the height dimension. Optionally, the switchable heater 110 comprises a housing. The housing is provided with communication holes corresponding to both ends of the first heat exchange pipe 111 and corresponding to the second heat exchange pipe 112.

Optionally, the refrigerant pipe assembly 120 includes: a first refrigerant pipe 121 and a second refrigerant pipe 122. A first end (left end shown in fig. 1) of the first refrigerant pipe 121 communicates with a first end of the first heat exchange pipe 111. The second end (lower end shown in fig. 1) of the first refrigerant pipe 121 is configured to communicate with the indoor unit 3.

A first end (an upper end shown in fig. 1) of the second refrigerant pipe 122 communicates with a second end of the first heat exchange pipe 111. The refrigerant enters the first heat exchange tube 111 through the first refrigerant tube 121, exchanges heat in the first heat exchange tube 111, and then flows into the second refrigerant tube 122 from the second end of the first heat exchange tube 111. The second end (lower end shown in fig. 1) of the second refrigerant pipe 122 is configured to output the refrigerant subjected to heat exchange through the first heat exchange pipe 111.

Optionally, the refrigerant pipeline assembly 120 further includes: and a third refrigerant pipe 123. A first end (left end shown in fig. 1) of the third refrigerant pipe 123 communicates with a first end of the second heat exchange pipe 112. The third refrigerant pipe 123 can be connected to the second end of the second refrigerant pipe 122 under the control of the on-off valve assembly 130, so as to receive the refrigerant output by the second refrigerant pipe 122 and convey the refrigerant to the second heat exchange pipeline 112. Alternatively, the third refrigerant pipe 123 may be connected to the indoor unit 3 under the control of the on-off valve assembly 130, so as to receive the refrigerant outputted from the second heat exchange pipe 112 and convey the refrigerant to the indoor unit 3.

Optionally, the on-off valve assembly 130 includes: a first on-off valve 131, a second on-off valve 132, and a reversing valve 133. The first on-off valve 131 is connected to the first refrigerant pipe 121 and is used for controlling on-off of the first refrigerant pipe 121. The second on-off valve 132 and the reversing valve 133 are both connected to the third refrigerant pipe 123, and the reversing valve 133 is communicated with the second end of the second refrigerant pipe 122. The switch-in position of the reversing valve 133 is closer to the second heat exchange conduit 112 than the switch-in position of the second shut-off valve 132.

The selector valve 133 has a first communication position and a second communication position, and is switchable between the two communication positions. The switching valve 133 switches the communication position and cooperates with the second switching valve 132 to allow the third refrigerant pipe 123 to communicate with the second refrigerant pipe 122 or allow the third refrigerant pipe 123 to communicate with the indoor unit 3.

Alternatively, the first on-off valve 131 and the second on-off valve 132 are two-position two-way electromagnetic valves. The reversing valve 133 is a two-position three-way solenoid valve.

Optionally, the heat exchange device 1 further comprises: the communication passage 140. Wherein the length of the communication channel 140 is smaller than the length of the first heat exchange tube 111. Optionally, the sum of the lengths of the communication channel 140 and the second heat exchange tube 112 is smaller than the length of the first heat exchange tube 111. Alternatively, the communication passage 140 is provided along the lateral direction of the switchable heater 110. Optionally, the communication channel 140 and the second heat exchange tube 112 are parallel to each other. The housing is provided with communication holes corresponding to both ends of the communication channel 140.

Optionally, to accommodate the layout of the heat exchange channels of different lengths within the switchable heater 110 and the connection of each heat exchange channel to the refrigerant line assembly 120, the second heat exchange conduit 112 and the communication channel 140 are disposed near the top or bottom of the switchable heater 110, respectively. For example, the second heat exchanging pipe 112 is disposed near the bottom of the switchable heater 110, and the communication channel 140 is disposed near the top of the switchable heater 110. In this way, a sufficient space can be provided between the second heat exchange pipe 112 and the communication passage 140 for the first heat exchange pipe 111 to satisfy the space required for the length of the first heat exchange pipe 111.

Optionally, the heat exchange device 1 further comprises: and a third connecting pipe 6. The first end (left end shown in fig. 1) of the third connection pipe 6 communicates with the first end (right end shown in fig. 1) of the communication passage 140. The second end (right end shown in fig. 1) of the third connection pipe 6 is used for communicating with the compressor 210 to convey the refrigerant outputted from the communication channel 140 to the compressor 210 or convey the refrigerant outputted from the compressor 210 to the communication channel 140. The specific direction of conveyance is related to the mode of operation of the air conditioner.

As shown in fig. 2, when the air conditioner is operated to heat, the first on-off valve 131 is in an open state, the second on-off valve 132 is in a closed state, and the reversing valve 133 is in a first communication position. At this time, the first refrigerant pipe 121 communicates, and the second refrigerant pipe 122 communicates with the third refrigerant pipe 123. The external refrigerant enters the first refrigerant pipe 121 and enters the first heat exchange pipe 111 through the first refrigerant pipe 121 to exchange heat. The refrigerant after heat exchange through the first heat exchange pipe 111 enters the second refrigerant pipe 122, then enters the third refrigerant pipe 123 through the reversing valve 133, and then enters the second heat exchange pipe 112. The refrigerant exchanges heat again in the second heat exchange pipe 112, flows out of the second heat exchange pipe 112 after completing the heat exchange, and then enters the outdoor heat exchanger 230. The refrigerant flowing out of the outdoor heat exchanger 230 enters the communication passage 140 and exchanges heat, and then flows out to the outside, for example, to the compressor through the third connection pipe 6. It can be seen that when the heat exchange device 1 is applied to the outdoor unit 2, the refrigerant exchanges heat in the outdoor unit 2 in the first heat exchange pipe 111, the second heat exchange pipe 112, the outdoor heat exchanger 230 and the communication channel 140 in sequence.

As shown in fig. 3, when the air conditioner operates to cool, a large amount of heat exchange of the refrigerant in the variable heat exchanger 110 is not required. I.e., the less refrigerant in the heat exchanger 110, the better. Therefore, the refrigerant in the switchable heat generator 110 needs to be extracted before the air conditioner operates to cool. The first on-off valve 131 is in an open state, and the second on-off valve 132 and the reversing valve 133 are in a closed state. At this time, the first refrigerant pipe 121 is connected, and the refrigerant in the second heat exchange pipe 112 is output to the outside through the refrigerant pipe.

As shown in fig. 4, when the operation is controlled, the first on-off valve 131 is in a closed state, the second on-off valve 132 is in an open state, and the reversing valve 133 is in a second communication position. At this time, the first refrigerant pipe 121 is disconnected, the second refrigerant pipe 122 is disconnected from the third refrigerant pipe 123, and the third refrigerant pipe 123 communicates with the indoor unit 3. The refrigerant enters the communication passage 140 through the third connection pipe 6, exchanges heat, and then enters the outdoor heat exchanger 230. The refrigerant flowing out of the outdoor heat exchanger 230 enters the second heat exchange pipe 112 to exchange heat, and is then output to the indoor unit 3 through the third refrigerant pipe 123. It can be seen that when the heat exchange device 1 is applied to the outdoor unit 2, the refrigerant exchanges heat in the communication channel 140, the outdoor heat exchanger 230 and the second heat exchange pipe 112 in sequence in the outdoor unit 2.

Optionally, the heat exchange device 1 further comprises: and a controller. The controller is in communication with the first on-off valve 131, the second on-off valve 132, and the reversing valve 133 to control on-off of the first on-off valve 131 and the second on-off valve 132, and reversing and off of the reversing valve 133.

Referring to fig. 5, an embodiment of the present disclosure provides an outdoor unit 2. The outdoor unit 2 includes: a compressor 210, a four-way valve 220, an outdoor heat exchanger 230, an outdoor air supply system 240, and the heat exchange device 1 described above.

The outdoor heat exchanger 230 has a first refrigerant port for communication with the indoor unit. The heat exchange device 1 is connected to the pipeline communicated with the first refrigerant port, so that the heat exchange flow paths with different flow path lengths of the variable heat exchanger 110 of the heat exchange device 1 are connected to the pipeline communicated with the first refrigerant port. In this way, the flow path length of the heat exchange flow path through which the refrigerant flows in the switchable heater 110 can be changed. Here, the fourth connection pipe 7 is a pipe communicating with the first refrigerant port.

Optionally, the heat exchange device 1 has a first interface and a second interface. The first interface is formed by the heat exchange channel with the shortest length in the plurality of heat exchange channels. Specifically, the second end of the second heat exchange tube 112 is a first interface. The second port is formed by a refrigerant line assembly. Specifically, the second end of the first refrigerant pipe 121 and the second end (lower end shown in fig. 5) of the third refrigerant pipe 123 form a second interface together. The first interface is communicated with a first refrigerant port through a first connecting pipe 4. The second interface is used for being communicated with the indoor unit. The second refrigerant port is communicated with the four-way valve. Specifically, the second refrigerant port communicates with a second end (left end shown in fig. 5) of the communication passage 140 through the second connection pipe 5.

As shown in connection with fig. 6 to 8, embodiments of the present disclosure provide an air conditioner. The air conditioner includes: an indoor unit 3 and the above-described outdoor unit 2.

The indoor unit 3 includes an indoor heat exchanger 310 and an indoor air supply system 320. The compressor 210, the four-way valve 220, the outdoor heat exchanger 230 and the indoor heat exchanger 310 are sequentially connected to form a refrigerant circulation loop.

The heat exchange device 1 is connected to the pipeline that the outdoor heat exchanger 230 is communicated with the indoor heat exchanger 310, so that the heat exchange flow paths with different flow path lengths of the convertible heater 110 of the heat exchange device 1 are connected to the pipeline that is communicated with the first refrigerant port. In this way, the flow path length of the heat exchange flow path through which the refrigerant flows in the switchable heater 110 can be changed.

Specifically, the first port of the heat exchange device 1 communicates with the first refrigerant port of the outdoor heat exchanger 230. The second port of the heat exchange device 1 communicates with the indoor heat exchanger 310. Optionally, the indoor heat exchanger 310 has a third refrigerant port and a fourth refrigerant port. Specifically, the second end of the third refrigerant pipe 123 communicates with the third refrigerant port of the indoor heat exchanger 310 through the fourth connection pipe 7. The wall surface of the fourth connecting pipe 7 is provided with a communication hole which is communicated with the second end of the first refrigerant pipe 121. The fourth refrigerant port communicates with the four-way valve 220 through the fifth connection pipe 8. Here, the fourth connection pipe 7 is optionally provided with a throttle 330. The connection position of the first refrigerant pipe 121 and the fourth connection pipe 7 is closer to the third refrigerant port than the installation position of the throttle device 330 is to the installation position of the throttle device 330.

As shown in fig. 6, when the air conditioner is operated to heat, the first on-off valve 131 is controlled to be in an open state, the second on-off valve 132 is controlled to be in a closed state, and the reversing valve 133 is controlled to be in a first communication position. At this time, the first refrigerant pipe 121 communicates, and the second refrigerant pipe 122 communicates with the third refrigerant pipe 123. The high-temperature and high-pressure refrigerant outputted from the compressor 210 enters the indoor heat exchanger 310 through the four-way valve 220 and the fifth connection pipe 8. The refrigerant outputted from the indoor heat exchanger 310 is throttled by the throttle device 330 and flows into the first refrigerant pipe 121. And then enters the first heat exchange pipeline 111 through the first on-off valve 131 to exchange heat. The refrigerant flowing out of the first heat exchange pipeline 111 enters the second refrigerant pipe 122, and then enters the second heat exchange pipeline 112 through the reversing valve 133 and the third refrigerant pipe 123 for heat exchange. The refrigerant outputted from the second heat exchanging pipe 112 enters the outdoor heat exchanger 230 through the first connection pipe 4. The refrigerant outputted from the outdoor heat exchanger 230 enters the communication passage 140 through the second connection pipe 5 to exchange heat. The refrigerant outputted from the communication passage 140 returns to the compressor 210 through the third connection pipe 6 and the four-way valve 220.

As shown in fig. 7, before the air conditioner operates to cool, the first on-off valve 131 is controlled to be in an open state, and the second on-off valve 132 and the reversing valve 133 are both in a closed state. At this time, the first refrigerant pipe 121 communicates. After the compressor 210 is operated, the high-temperature and high-pressure refrigerant outputted therefrom sequentially passes through the four-way valve 220, the third connection pipe 6, the communication passage 140 and the second connection pipe 5 to enter the outdoor heat exchanger 230. Meanwhile, the refrigerant in the first heat exchange pipe 111 flows into the indoor heat exchanger 310 through the first refrigerant pipe 121 and the fourth connection pipe 7. The refrigerant outputted from the indoor heat exchanger 310 returns to the compressor 210 through the fifth connection pipe 8 and the four-way valve 220. Thus, the refrigerant in the switchable heater 110 can be extracted. After the compressor 210 is operated for a period of time, a substantial portion of the refrigerant can be recovered into the compressor 210 and the outdoor heat exchanger 230.

As shown in fig. 8, when the operation is controlled to cool, the first on-off valve 131 is controlled to be in a closed state, the second on-off valve 132 is controlled to be in an open state, and the reversing valve 133 is controlled to be in a second communication position. At this time, the first refrigerant pipe 121 is disconnected, the second refrigerant pipe 122 is disconnected from the third refrigerant pipe 123, and the third refrigerant pipe 123 is connected to the indoor heat exchanger 310 through the fourth connection pipe 7. The high-temperature and high-pressure refrigerant outputted from the compressor 210 sequentially passes through the four-way valve 220 and the third connection pipe 6 to enter the communication channel 140 for heat exchange. The refrigerant outputted from the communication passage 140 enters the outdoor heat exchanger 230 through the second connection pipe 5. The refrigerant outputted from the outdoor heat exchanger 230 enters the second heat exchanging pipe 112 through the first connection pipe 4 to exchange heat. The refrigerant outputted from the second heat exchanging pipe 112 enters the third refrigerant pipe 123 and sequentially passes through the reversing valve 133 and the second on-off valve 132 to enter the fourth connecting pipe 7. The refrigerant is throttled by the throttle device 330 and then enters the indoor heat exchanger 310. The refrigerant outputted from the indoor heat exchanger 310 enters the four-way valve 220 through the fifth connection pipe 8 and then returns to the compressor 210.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may include structural and other modifications. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (12)

1. A heat exchange device for an air conditioner, comprising:

a variable heat exchanger having a plurality of heat exchange channels;

the refrigerant pipeline assembly is controllably communicated with different heat exchange channels to form heat exchange flow paths with different flow path lengths in the convertible heater;

the on-off valve assembly is arranged on the refrigerant pipeline assembly and used for controlling the on-off of the refrigerant pipeline assembly and different heat exchange channels so as to change the flow path length of a heat exchange flow path through which the refrigerant flows in the convertible heater.

2. The heat exchange device of claim 1, wherein the heat exchange channel comprises:

the first end of the first heat exchange pipeline is communicated with the indoor unit through a controlled refrigerant pipeline assembly;

the first end of the second heat exchange pipeline is communicated with the second end of the first heat exchange pipeline through a controlled refrigerant pipeline assembly, or is used for being communicated with the indoor unit through the controlled refrigerant pipeline assembly; the second end is used for being communicated with the outdoor heat exchanger;

the length of the second heat exchange pipeline is smaller than that of the first heat exchange pipeline.

3. The heat exchange device of claim 2 wherein the refrigerant line assembly comprises:

the first end of the first refrigerant pipe is communicated with the first end of the first heat exchange pipeline, and the second end of the first refrigerant pipe is used for being communicated with the indoor unit;

and the first end of the second refrigerant pipe is communicated with the second end of the first heat exchange pipeline, and the second end is used for outputting the refrigerant subjected to heat exchange through the first heat exchange pipeline.

4. The heat exchange device of claim 3 wherein the refrigerant line assembly further comprises:

the first end of the third refrigerant pipe is communicated with the second heat exchange pipeline;

the third refrigerant pipe can be controlled to be communicated with the second end of the second refrigerant pipe so as to convey the refrigerant output by the first heat exchange pipeline to the second heat exchange pipeline; or the refrigerant output by the second heat exchange pipeline can be controlled to be communicated with the indoor unit so as to be conveyed to the indoor unit.

5. The heat exchange device of claim 4 wherein the on-off valve assembly comprises:

the first on-off valve is connected with the first refrigerant pipe and used for controlling the on-off of the first refrigerant pipe;

the second on-off valve is connected with a third refrigerant pipe;

the reversing valve is connected into the third refrigerant pipe and is communicated with the second end of the second refrigerant pipe, and is used for switching the communication position and matching with the second switching valve so as to enable the third refrigerant pipe to be communicated with the second refrigerant pipe or enable the third refrigerant pipe to be communicated with the indoor unit.

6. A heat exchange device according to claim 5 wherein,

under the condition that the air conditioner heats in an operation mode, the first on-off valve is in an open state, and the second on-off valve is in a closed state; the reversing valve is positioned at a first communication position so as to enable the first refrigerant pipeline to be communicated, and the second refrigerant pipe is communicated with the third refrigerant pipe.

7. A heat exchange device according to claim 5 wherein,

before the air conditioner operates for refrigeration, the first on-off valve is in an open state, and the second on-off valve and the reversing valve are both in a closed state.

8. A heat exchange device according to claim 5 wherein,

under the condition of air conditioner operation refrigeration, the first on-off valve is in a closed state; the second on-off valve is in an open state, and the reversing valve is in a second communication position so that the third refrigerant pipe is communicated with the indoor unit.

9. The heat exchange device according to any one of claims 1 to 8, further comprising:

the communication channel is arranged in the convertible heat exchanger, and two ends of the communication channel are respectively communicated with the outdoor heat exchanger and the compressor and used for conveying the refrigerant output by the outdoor heat exchanger to the compressor or conveying the refrigerant output by the compressor to the outdoor heat exchanger.

10. The heat exchange device of claim 9, further comprising:

the connecting pipe, first end is linked together with the intercommunication passageway, and the second end is used for being linked together with the compressor for carry the refrigerant of intercommunication passageway output to the compressor, perhaps carry the refrigerant of compressor output to the intercommunication passageway.

11. An outdoor unit, comprising: a compressor, a four-way valve, an outdoor heat exchanger and a heat exchange device according to any one of claims 1 to 10;

the outdoor heat exchanger is provided with a first refrigerant port communicated with the indoor unit;

the pipeline communicated with the first refrigerant port is connected with the heat exchange device, so that heat exchange flow paths with different flow path lengths of the variable heat exchanger of the heat exchange device are connected with the pipeline communicated with the first refrigerant port, and the flow path length of the heat exchange flow path through which the refrigerant flows in the variable heat exchanger is changed.

12. An air conditioner, comprising:

the indoor unit comprises an indoor heat exchanger; and, a step of, in the first embodiment,

the outdoor unit of claim 11;

the compressor, the four-way valve, the outdoor heat exchanger and the indoor heat exchanger are sequentially communicated to form a refrigerant circulation loop;

the heat exchange device is connected to a pipeline which is communicated with the outdoor heat exchanger and the indoor heat exchanger, so that heat exchange flow paths with different flow path lengths of the variable heat exchanger of the heat exchange device are connected to a pipeline which is communicated with the first refrigerant port, and the flow path length of the heat exchange flow path through which the refrigerant flows in the variable heat exchanger is changed.