CN217716027U - Heat exchanger and heat exchange system - Google Patents

Abstract

The application provides a heat exchanger and a heat exchange system. The heat exchanger comprises a heat exchange body, a first heat exchange tube and a second heat exchange tube. The first heat exchange tube comprises a first tube opening and a second tube opening. The first heat exchange tube penetrates through the heat exchange body. The second heat exchange tube is arranged in the first heat exchange tube. The second heat exchange tube comprises a third tube orifice and a fourth tube orifice. The second heat exchange tube penetrates through the heat exchange body. A first heat exchange channel is formed between the outer wall of the second heat exchange tube and the inner wall of the first heat exchange tube. The second heat exchange channel is formed inside the second heat exchange tube. The heat exchange system comprises a heat exchanger. In this way, the second heat exchange tube is arranged in the first heat exchange tube, so that a first heat exchange channel for flowing the first fluid and a second heat exchange channel for flowing the second fluid are formed, and the purpose of heat exchange between the first fluid and the external medium is achieved. Compare in and realize two kinds of media through a heat transfer passageway and carry out the scheme that the heat transfer, the purpose that the heat exchanger can realize the heat transfer of at least three kinds of media in this application increases application scenario.

Description

Heat exchanger and heat exchange system

Technical Field

The application relates to the field of heat exchange equipment, in particular to a heat exchanger and a heat exchange system.

Background

A heat exchanger is a device for transferring heat from a hot fluid to a cold fluid to meet specified process requirements, and is an industrial application of convective heat transfer and conductive heat transfer. In the related art, a heat exchange tube is provided in a heat exchanger. The heat exchange tube forms a heat exchange channel and can only realize the purpose of heat exchange of two media, thereby causing the problem of limited application scenes.

SUMMERY OF THE UTILITY MODEL

The application provides an improved heat exchanger and heat exchange system.

The application provides a heat exchanger, wherein include:

the heat exchange body comprises a first side and a second side which are oppositely arranged along a first direction;

the first heat exchange tube comprises a first tube opening and a second tube opening, the first heat exchange tube penetrates through the heat exchange body, and the first tube opening and the second tube opening are positioned on the first side of the heat exchange body; and

the second heat exchange tube is arranged in the first heat exchange tube and comprises a third tube orifice and a fourth tube orifice, the second heat exchange tube penetrates through the heat exchange body, and the third tube orifice and the fourth tube orifice are positioned on the first side of the heat exchange body; a first heat exchange channel is formed between the outer wall of the second heat exchange tube and the inner wall of the first heat exchange tube; and a second heat exchange channel is formed inside the second heat exchange tube.

Optionally, the first heat exchange tube comprises a first tube body and a second tube body; the first pipe orifice is arranged at the first end of the first pipe body, which is close to the first side of the heat exchange body; the second pipe orifice is arranged at the first end of the second pipe body, which is close to the first side of the heat exchange body; the first pipe body is close to the second end of the second side of the heat exchange body and the second pipe body is close to the second end of the second side of the heat exchange body.

Optionally, the first pipe and the second pipe are staggered with respect to the heat exchange body along a second direction, and the second direction is perpendicular to the first direction.

Optionally, the first pipe body and the second pipe body are arranged in parallel.

Optionally, the first heat exchange tube further comprises a first bent tube connected between the second end of the first tube body and the second end of the second tube body, and the first bent tube is exposed out of the heat exchange body from the second side of the heat exchange body.

Optionally, the second heat exchange tube comprises a third tube body and a fourth tube body; the third pipe body is arranged in the first pipe body, and the fourth pipe body is arranged in the second pipe body;

the third pipe orifice is arranged at the first end of the third pipe body, which is close to the first side of the heat exchange body; the fourth pipe orifice is arranged at the first end of the fourth pipe body, which is close to the first side of the heat exchange body; the third pipe body is close to the second end of the second side of the heat exchange body and the fourth pipe body is close to the second end of the second side of the heat exchange body.

Optionally, the first pipe body and the third pipe body are coaxially arranged; and/or

The second pipe body and the fourth pipe body are coaxially arranged.

Optionally, the third pipe body and the fourth pipe body are arranged in parallel.

Optionally, the first heat exchange tube further comprises a first bent tube connected between the second end of the first tube body and the second end of the second tube body, and the first bent tube is exposed out of the heat exchange body from the second side of the heat exchange body;

the second heat exchange tube further comprises a second bent tube connected between the second end of the third tube body and the second end of the fourth tube body, and the second bent tube is arranged in the first bent tube.

Optionally, the first bending pipe and the second bending pipe are coaxially arranged.

Optionally, the number of the first heat exchange tubes is multiple; the number of the second heat exchange tubes corresponds to that of the first heat exchange tubes; one of the first heat exchange tubes is internally provided with one of the second heat exchange tubes.

The application also provides a heat exchange system, which comprises the heat exchanger.

The application provides a heat exchanger includes heat transfer body, first heat exchange tube and second heat exchange tube. The first heat exchange tube comprises a first tube opening and a second tube opening. The first heat exchange tube penetrates through the heat exchange body. The first nozzle and the second nozzle are positioned on the same side of the heat exchange body. The second heat exchange tube is arranged in the first heat exchange tube. The second heat exchange tube comprises a third tube orifice and a fourth tube orifice. The second heat exchange tube penetrates through the heat exchange body. The third pipe orifice and the fourth pipe orifice are positioned on the same side of the heat exchange body. A first heat exchange channel is formed between the outer wall of the second heat exchange tube and the inner wall of the first heat exchange tube. The second heat exchange channel is formed inside the second heat exchange tube. Therefore, the first heat exchange channel and the second heat exchange channel can be formed by arranging the second heat exchange tube in the first heat exchange tube, so that the first fluid can flow in the first heat exchange channel and the second fluid can flow in the second heat exchange channel, and the purpose of heat exchange between the first fluid and the external medium and the second fluid is achieved. Compare in and realize two kinds of media through a heat transfer passageway and carry out the scheme of heat transfer, the purpose of three kinds of medium heat transfer at least can be realized to the heat exchanger in this application, increases the application scene.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

FIG. 1 is a schematic diagram of a perspective view of a heat exchanger according to the present application;

FIG. 2 is a schematic structural view of another perspective of the heat exchanger of the present application;

FIG. 3 is a schematic diagram illustrating the construction of one embodiment of the heat exchange system of the present application;

FIG. 4 is a schematic circuit diagram of an exemplary embodiment of a heat exchange system of the present application in a first mode of operation;

FIG. 5 is a schematic circuit diagram of an exemplary embodiment of the heat exchange system of the present application in a second mode of operation;

FIG. 6 is a schematic circuit diagram of another exemplary embodiment of a heat exchange system of the present application in a first mode of operation;

FIG. 7 is a schematic circuit diagram of another exemplary embodiment of the heat exchange system of the present application in a second mode of operation;

FIG. 8 is a schematic circuit diagram of an exemplary embodiment of a heat exchange system of the present application in a third mode of operation;

FIG. 9 is a schematic circuit diagram of an exemplary embodiment of a heat exchange system of the present application in a fourth mode of operation;

fig. 10 is a schematic circuit diagram of an exemplary embodiment of a heat exchange system of the present application in a fifth mode of operation.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of devices consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like, as used in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

The application provides a heat exchanger, including heat transfer body, first heat exchange tube and second heat exchange tube. The heat exchange body comprises a first side and a second side which are oppositely arranged along a first direction. The first heat exchange tube comprises a first tube opening and a second tube opening. The first heat exchange tube penetrates through the heat exchange body. The first pipe orifice and the second pipe orifice are positioned on the first side of the heat exchange body. The second heat exchange tube is arranged in the first heat exchange tube. The second heat exchange tube comprises a third tube orifice and a fourth tube orifice. The second heat exchange tube penetrates through the heat exchange body. The third pipe orifice and the fourth pipe orifice are positioned on the first side of the heat exchange body. A first heat exchange channel is formed between the outer wall of the second heat exchange tube and the inner wall of the first heat exchange tube. The second heat exchange channel is formed inside the second heat exchange tube. Therefore, the first heat exchange channel and the second heat exchange channel can be formed by arranging the second heat exchange tube in the first heat exchange tube, so that the first fluid can flow in the first heat exchange channel and the second fluid can flow in the second heat exchange channel, and the purpose of heat exchange between the first fluid and the external medium and the second fluid is achieved. Compare in and realize two kinds of media through a heat transfer passageway and carry out the scheme that the heat transfer, the purpose that the heat exchanger can realize the heat transfer of at least three kinds of media in this application increases application scenario.

The application also provides a heat exchange system, which comprises a heat exchanger.

Fig. 1 is a schematic structural diagram of a perspective view of a heat exchanger 1 provided in the present application. Fig. 2 is a schematic structural diagram of another view of the heat exchanger 1 provided in the present application. Referring to fig. 1 and 2, a heat exchanger 1 includes a heat exchange body 2, a first heat exchange tube 3 and a second heat exchange tube 4. The heat exchange body 2 comprises a first side (left side in fig. 1) and a second side (right side in fig. 1) which are oppositely arranged along a first direction (X-axis direction in fig. 1). The first heat exchange tube 3 comprises a first nozzle 5 and a second nozzle 6. The first heat exchange tube 3 penetrates through the heat exchange body 2. The first and second nozzles 5, 6 are located at a first side of the heat exchange body 2. That is, the first nozzle 5 and the second nozzle 6 are located on the same side of the heat exchange body 2. Thus, the contact area between the first heat exchange tube 3 and the heat exchange body 2 is increased, and the heat exchange effect is facilitated. A second heat exchange tube 4 is disposed within the first heat exchange tube 3. The second heat exchange tube 4 comprises a third tube opening 7 and a fourth tube opening 8. The second heat exchange tube 4 penetrates through the heat exchange body 2. The third nozzles 7 and the fourth nozzles 8 are located at the first side of the heat exchange body 2. That is, the third nozzle 7 and the fourth nozzle 8 are located on the same side of the heat exchange body 2. This increases the space formed between the second heat exchange tube 4 and the first heat exchange tube 3. A first heat exchange channel 9 is formed between the outer wall of the second heat exchange tube 4 and the inner wall of the first heat exchange tube 3. The second heat exchange tube 4 is internally formed with a second heat exchange channel 10. In this embodiment, the heat exchange body 2 comprises a plurality of fins with through holes, and the plurality of fins are stacked to form but not limited to a rectangular parallelepiped structure. The first heat exchange tubes 3 may be evaporator tubes, penetrating the rectangular parallelepiped structure. The heat exchange body 2 is used for increasing the heat exchange area of the first heat exchange tube 3, so that the heat exchange efficiency of the first heat exchange tube 3 can be improved. The second heat exchanging tube 4, which may be a condensing tube, is provided inside the first heat exchanging tube 3 such that a first heat exchanging channel 9 is formed between the first heat exchanging tube 3 and the second heat exchanging tube 4, and the second heat exchanging tube 4 itself can also be formed with a second heat exchanging channel 10. Thus, two heat exchange channels can be formed, so that a first fluid can flow in the first heat exchange channel 9 and a second fluid can flow in the second heat exchange channel 10, and the purpose of heat exchange of the first fluid, the second fluid and an external medium is achieved. Compare in the scheme that realizes two kinds of media and carry out the heat transfer through a heat transfer passageway that a heat exchange tube formed, heat exchanger 1 can realize the purpose of three kinds of medium heat transfer at least in this application, increases application scenario. In some embodiments, the first heat exchange tube 3 is a copper tube. The second heat exchange tube 4 is a copper tube. In some embodiments, the inner wall of the first heat exchange tube 3 and the outer wall of the second heat exchange tube 4 may be welded by a plurality of tin bars, so that the second heat exchange tube 4 is stably arranged in the first heat exchange tube 3. It should be noted that the plurality of tin bars are arranged so as not to affect the circulation of the fluid in the first heat exchange channel 9. In some embodiments, the second heat exchange tube 4 can be stably arranged in the first heat exchange tube 3 through the connection of the first tube orifice 5 and the third tube orifice 7 and the connection of the second tube orifice 6 and the fourth tube orifice 8. Of course, the fixing manner of the first heat exchange pipe 3 and the fourth heat exchange pipe 4 is not limited thereto, and other possible fixing manners can be adopted. In some embodiments, the first fluid may comprise a refrigerant or liquid water. The second fluid may comprise a refrigerant or liquid water.

In some embodiments, the first heat exchange tubes 3 comprise a first tube 11 and a second tube 12. The first pipe orifice 5 is disposed at a first end (left end in fig. 1) of the first pipe 11 close to the first side of the heat exchange body 2. The second pipe orifice 6 is arranged at a first end (left end in fig. 1) of the first pipe body 11 close to the first side of the heat exchange body 2. The second end (for example, the right end in fig. 1) of the first tube 11 close to the second side of the heat exchange body 2 is communicated with the second end (for example, the right end in fig. 1) of the second tube close to the second side of the heat exchange body. In this embodiment, the first tube 11 penetrates from the first side of the heat exchange body 2 to the second side of the heat exchange body 2. The second tube 12 runs through the heat exchange body 2 from the first side of the heat exchange body 2 to the second side of the heat exchange body 2. The second end of the first tube 11 is communicated with the second end of the second tube 12 at the second side of the heat exchange body 2. In this way, fluid can pass from the first orifice 5 to the second orifice 6 through the first tube 11 and the second tube 12. That is, the fluid in the first heat exchange tube 3 can flow back and forth in the heat exchange body 2, so that the efficiency of fluid heat exchange is effectively improved.

In some embodiments, the first tube 11 and the second tube 12 are staggered in a second direction (e.g., Y direction in fig. 1 and Y direction in fig. 2) with respect to the heat exchange body 2. The second direction is perpendicular to the first direction. Therefore, on one hand, the first pipe body 11 and the second pipe body 12 are prevented from having an overlapping part in the second direction of the heat exchange body 2, so that deformation is prevented when the first pipe body and the second pipe body are extruded; on the other hand, the space of the second direction of the heat exchange body 2 can be saved to satisfy the problem that the space of the heat exchange body 2 is limited.

In some embodiments, the first tube 11 is disposed in parallel with the second tube 12. So, be favorable to the fluid evenly to circulate in first body 11 and second body 12 to make the fluid heat transfer even, the heat transfer is effectual. Of course, the first tube 11 and the second tube 12 may be inclined to each other.

In some embodiments, the first heat exchanging tube 3 further comprises a first bent tube 50 connected between the second end of the first tube 11 and the second end of the second tube 12, and the first bent tube 50 is exposed from the second side of the heat exchanging body 2 to the heat exchanging body 2. In this embodiment, the first tube 11 and the second tube 12 can communicate with each other through the first bending tube 50, so that the fluid can flow from the first tube 11 to the second tube 12, or the fluid can flow from the second tube 12 to the first tube 11. In some embodiments, the first tube 11, the first bending tube 50 and the second tube 12 are sequentially connected to form an integral U-shaped tube. In some embodiments, the first pipe 11 and the second pipe 12 may also be a split straight pipe, so that the second end of the first pipe 11 and the second end of the second pipe 12 may also be connected by other connecting pipes.

In some embodiments, the second heat exchange tube 4 comprises a third tube body 13 and a fourth tube body 14. The third tube 13 is disposed in the first tube 11, such that a portion of the first heat exchanging channel 9 is formed between an outer wall of the third tube 13 and an inner wall of the first tube 11. The fourth tube 14 is disposed in the second tube 12 such that another portion of the second heat exchanging channel 10 is formed between an outer wall of the fourth tube 14 and an inner wall of the second tube 12. The third pipe orifice 7 is arranged at the first end of the third pipe body 13 close to the first side of the heat exchange body 2. The fourth pipe orifice 8 is arranged at the first end of the fourth pipe body 14 close to the first side of the heat exchange body 2. The second end of the third pipe 13 close to the second side of the heat exchange body 2 is communicated with the second end of the fourth pipe 14 close to the second side of the heat exchange body 2. In this embodiment, the second heat exchange tube 4 is provided inside the first heat exchange tube 3 such that the third tube body 13 of the second heat exchange tube 4 indirectly penetrates from the first side of the heat exchange body 2 to the second side of the heat exchange body 2. The fourth tubes 14 of the second heat exchange tube 4 extend indirectly from the first side of the heat exchange body 2 to the second side of the heat exchange body 2. The second end of the third tube 13 communicates with the second end of the fourth tube 14 at the second side of the heat exchange body 2. In this way, fluid can pass from the third orifice 7 to the fourth orifice 8 through the third tube 13 and the fourth tube 14. That is to say, the fluid in the second heat exchange tube 3 can flow back and forth in the heat exchange body 2, thus effectively improving the heat exchange efficiency of the fluid. In some embodiments, the third tube 13 and the fourth tube 14 are a unitary U-shaped structure. In some embodiments, the third pipe 13 and the fourth pipe 14 may be a split straight pipe, so that one end of the third pipe 13 and one end of the fourth pipe 14 may be connected by other connecting pipes.

In some embodiments, the first tube 11 is coaxially disposed with the third tube 13. So for fluid can be flow evenly between the outer wall of third body 13 and the inner wall of first body 11, thereby realizes the even mesh of heat transfer.

In some embodiments, the second tube 12 is coaxially disposed with the fourth tube 14. So for fluid can be flow evenly between the outer wall of fourth body 14 and the inner wall of second body 12, thereby realizes the even mesh of heat transfer. Moreover, the coaxial arrangement of the first tube 11 and the second tube 12, and the coaxial arrangement of the second tube 12 and the fourth tube 14, that is to say, the first heat exchange tube 3 and the second heat exchange tube 4 are kept coaxial, so that the flow rate of the fluid in the first heat exchange channel 9 formed between the inner wall of the first heat exchange tube 3 and the outer wall of the second heat exchange tube 4 is relatively uniform, which is beneficial to the heat exchange effect.

In some embodiments, the third tube 13 is disposed parallel to the fourth tube 14. So, be favorable to the fluid evenly to circulate in third body 13 and fourth body 14 to make the fluid heat transfer even, the heat transfer is effectual. In addition, the third pipe 13 needs to be changed according to the change in the structure of the first pipe 11. The fourth pipe 14 needs to be changed according to the change of the structure of the second pipe 12.

In some embodiments, the second heat exchange tube 4 further comprises a second bend tube 51 connected between the second end of the third tube body 13 and the second end of the fourth tube body 14, so that fluid can pass from the third tube body 13 to the fourth tube body 14 or fluid can pass from the fourth tube body 14 to the third tube body 13. The second bending pipe 51 is disposed in the first bending pipe 50. Therefore, the effect of sleeving the integral first heat exchange tube 3 on the integral second heat exchange tube 4 is good, so that the fluid can smoothly circulate between the first heat exchange tube 3 and the second heat exchange tube 4, and the fluid can smoothly circulate in the second heat exchange tube 4.

In some embodiments, the first bending tube 50 is disposed coaxially with the second bending tube 51. Therefore, the flow of the fluid can be uniform between the outer wall of the second bent pipe 51 and the inner wall of the first bent pipe 50, and the purpose of uniform heat exchange is achieved.

In some embodiments, the number of the first heat exchange tubes 3 is plural. Thus, a plurality of first heat exchange tubes 3 penetrate through the heat exchange body 2, and the heat exchange efficiency of the fluid is improved. The number of the second heat exchanging pipes 4 corresponds to the number of the first heat exchanging pipes 3. A first heat exchange tube 3 is provided with a second heat exchange tube 4. Therefore, the first heat exchange tubes 3 and the second heat exchange tubes 4 are ensured to be matched in a one-to-one correspondence mode, and the overall heat exchange effect of the heat exchanger 1 is improved.

Fig. 3 is a schematic structural diagram of an embodiment of the heat exchange system 15 provided in the present application. As shown in fig. 3, the heat exchange system 15 comprises the heat exchanger 1 and a first heat exchange device group 16 and a second heat exchange device group 17. Wherein, one of the first heat exchange tube 3 and the second heat exchange tube 4 in the heat exchanger 1 is connected with the first heat exchange equipment group 16. The other of the first heat exchange tube 3 and the second heat exchange tube 4 in the heat exchanger 1 is connected to a second heat exchange equipment group 17. The first heat exchange device group 16 and the second heat exchange device group 17 are both device groups capable of realizing heat exchange and transfer. For example, the first bank of heat exchange equipment 16 and the second bank of heat exchange equipment 17 may transfer heat from a high temperature fluid to a low temperature fluid. In this embodiment, the heat exchanger 1 corresponds to a combination of an intermediate heat exchanger and an evaporator tube or a condenser tube. In this way, the first heat exchange device group 16 and the heat exchanger 1 can be started to perform conventional heating or conventional cooling, the second heat exchange device group 17 can be started to perform conventional heating or conventional cooling, and the first heat exchange device group 16, the heat exchanger 1 and the second heat exchange device group 17 can be started to perform conventional cooling or conventional heating or low-temperature heating. Therefore, compared with a scheme that the intermediate heat exchanger and one evaporation pipe or one condensation pipe are arranged separately, the system pipeline and other equipment parts (the equipment parts can be electromagnetic valves and/or electronic expansion valves) are effectively reduced, so that the cost is effectively reduced, and the filling amount of fluid in the system pipeline is reduced.

Specifically, the first heat exchange device group 16 includes a first compressor 18, a first four-way valve 19, and a first heat exchanger 20. The first compressor 18 includes a first port 21 and a second port 22. The first four-way valve 19 includes a first port 23, a second port 24, a third port 25, and a fourth port 26. The first through opening 21 is connected to the first port 23. The second port 22 is connected to the third port 25. The second port 24 is connected to the first heat exchanger 20. The fourth port 26 is connected to the second port 6 of the first heat exchange tube 3. The first heat exchanger 20 is connected to the first pipe orifice 5 of the first heat exchange tube 3. In this embodiment, when the second heat exchange device group 17 is in the closed state, the connection relationship among the first compressor 18, the first four-way valve 19, the first heat exchanger 20 and the first heat exchange tube 3 can enable the heat exchange system 15 to form a refrigeration loop or a heating loop, so that the heat exchange system 15 can be switched between the refrigeration mode and the heating mode to prepare low-temperature cold water or high-temperature hot water. In some embodiments, the first heat exchange device set 16 further comprises a first fan 49, and the first fan 49 is disposed near the heat exchanger 1 to enhance the heat exchange effect of the heat exchanger 1.

Fig. 4 is a schematic circuit diagram of an exemplary embodiment of the heat exchange system 15 provided in the present application in the first operation mode. As shown in FIG. 4, in some embodiments, heat exchange system 15 includes a first mode of operation; in the first operation mode, the second port 22, the third port 25, the fourth port 26, the first heat exchange tube 3, the first heat exchanger 20, the second port 24, the first port 23 and the first port 21 are sequentially communicated to form a first refrigeration circuit (as shown by the direction of the arrow in fig. 4). In this embodiment, the first operation mode is a normal cooling mode formed by the first heat exchange device group 16 and the heat exchanger 1 being started together. The refrigerant passes through the third port 25 and the fourth port 26 of the first four-way valve 19, the first heat exchange tube 3, the first heat exchanger 20, the second port 24 and the first port 23 of the first four-way valve 19 in sequence from the first compressor 18 and finally returns to the first compressor 18, and the refrigerant is circulated repeatedly in such a way, so that the conventional refrigeration started by the first heat exchange device group 16 and the heat exchanger 1 in the heat exchange system 15 is realized, and the low-temperature cold water is prepared.

Fig. 5 is a schematic circuit diagram of an exemplary embodiment of the heat exchange system 15 provided in the present application in a second operating mode. As shown in FIG. 5, in some embodiments, heat exchange system 15 includes a second mode of operation; in the second operation mode, the second port 22, the third port 25, the second port 24, the first heat exchanger 20, the first heat exchange tube 3, the fourth port 26, the first port 23 and the first port 21 are sequentially communicated to form a first heating loop (as shown by the direction of the arrow in fig. 5). In this embodiment, the second operation mode is a normal heating mode formed by the first heat exchange device group 16 and the heat exchanger 1 being started together. The refrigerant flows in a repeated circulation manner from the first compressor 18 through the third port 25 and the second port 24 of the first four-way valve 19, the first heat exchanger 20, the first heat exchange pipe 3, the fourth port 26 and the first port 23 of the first four-way valve 19 and finally back to the first compressor 18 in sequence, so that the conventional heating of the first heat exchange equipment group 16 and the heat exchanger 1 in the heat exchange system 15 started together is realized, and high-temperature hot water is prepared.

With continued reference to fig. 3, in some embodiments, the second heat exchange device set 17 includes a second compressor 27, a second four-way valve 28, a second heat exchanger 29 and a third heat exchanger 30. The second compressor 27 includes a third port 31 and a fourth port 32. The second four-way valve 28 includes a fifth port 33, a sixth port 34, a seventh port 35, and an eighth port 36. The third port 31 is connected to the fifth port 33. The fourth port 32 is connected to the seventh port 35. The eighth port 36 is connected to the second heat exchanger 29. The sixth port 34 is connected to the third heat exchanger 30. The third heat exchanger 30 is connected to the second heat exchanger 29. A third pipe orifice 7 of the second heat exchange pipe 4 is connected with a third port 31; the fourth pipe orifice 8 of the second heat exchange pipe 4 is connected with a third heat exchanger 30. In this embodiment, when the first heat exchange equipment set 16 is in a closed state, the connection relationship among the second compressor 27, the second four-way valve 28, the second heat exchanger 29 and the third heat exchanger 30 enables the heat exchange system 15 to form a cooling loop or a heating loop, so that the heat exchange system 15 can be switched between a cooling mode and a heating mode to produce cold water at a low temperature or hot water at a high temperature. In some embodiments, the second heat exchanging device group 17 further comprises a second fan 37, and the second fan 37 is disposed near the third heat exchanger 30 to enhance the heat exchanging effect of the third heat exchanger 30.

Fig. 6 is a schematic circuit diagram of another exemplary embodiment of the heat exchange system 15 provided in the present application in the first operating mode. As shown in fig. 6, in the first operation mode, the third port 31, the fifth port 33, the sixth port 34, the third heat exchanger 30, the second heat exchanger 29, the eighth port 36, the seventh port 35 and the fourth port 32 are sequentially communicated to form the second refrigeration circuit (as shown by the direction indicated by the arrow in fig. 6). In this embodiment, the first mode of operation is the normal cooling mode of the second heat exchange unit 17. The refrigerant passes through the fifth port 33 and the sixth port 34 of the second four-way valve 28, the third heat exchanger 30, the second heat exchanger 29, the eighth port 36 and the seventh port 35 of the second four-way valve 28 in sequence, and finally returns to the second compressor 27, and the circulation flow is repeated, so that the normal refrigeration of the second heat exchange equipment group 17 in the heat exchange system 15 is realized, and the low-temperature cold water is prepared.

Fig. 7 is a schematic circuit diagram of another exemplary embodiment of the heat exchange system 15 provided in the present application in the second operating mode. As shown in fig. 7, in the second operation mode, the third port 31, the fifth port 33, the eighth port 36, the second heat exchanger 29, the third heat exchanger 30, the seventh port 35, the sixth port 34, and the fourth port 32 are sequentially communicated to form a second heating circuit (as shown by the direction of the arrow in fig. 7). In this embodiment, the second operation mode is a normal heating mode of the second heat exchange device group 17. The refrigerant passes through the fifth port 33, the eighth port 36, the second heat exchanger 29, the third heat exchanger 30, the seventh port 35 and the sixth port 34 of the second four-way valve 28 from the second compressor 27 in sequence, and finally returns to the second compressor 27, and the refrigerant is circulated repeatedly in such a way, so that the conventional heating of the second heat exchange equipment group 17 in the heat exchange system 15 is realized, and the high-temperature hot water is prepared.

Fig. 8 is a schematic circuit diagram of an exemplary embodiment of the heat exchange system 15 provided in the present application in a third operating mode. As shown in FIG. 8, the heat exchange system 15 includes a third mode of operation; in the third operation mode, the second port 22, the third port 25, the fourth port 26, the first heat exchange tube 3, the first heat exchanger 20, the second port 24, the first port 23 and the first port 21 are sequentially communicated to form a first refrigeration circuit (as shown by the direction of the left arrow in fig. 8), and the third port 31, the fifth port 33, the sixth port 34, the third heat exchanger 30, the second heat exchanger 29, the eighth port 36, the seventh port 35 and the fourth port 32 are sequentially communicated to form a second refrigeration circuit (as shown by the direction of the right arrow in fig. 8). In this embodiment, the third operation mode is a normal cooling mode in which the first heat exchange device group 16, the heat exchanger 1 and the second heat exchange device group 17 are simultaneously activated. When the first refrigeration loop formed by the first heat exchange device group 16 and the heat exchanger 1 has insufficient refrigeration capacity, the second heat exchange device group 17 can be started to form a second refrigeration loop. Therefore, the first heat exchange equipment group 16, the heat exchanger 1 and the second heat exchange equipment group 17 are used for refrigerating at the same time, so that the refrigerating effect is improved.

FIG. 9 is a schematic circuit diagram illustrating an exemplary embodiment of a heat exchange system 15 provided herein in a fourth mode of operation. As shown in fig. 9, heat exchange system 15 includes a fourth mode of operation; in the fourth operation mode, the second port 22, the third port 25, the second port 24, the first heat exchanger 20, the first heat exchange tube 3, the fourth port 26, the first port 23 and the first port 21 are communicated in sequence to form a first heating circuit (as shown by the direction pointed by the left arrow in fig. 9); and the third port 31, the fifth port 33, the eighth port 36, the second heat exchanger 29, the third heat exchanger 30, the seventh port 35, the sixth port 34, and the fourth port 32 are communicated in series to form a second heating circuit (as shown in the direction in which the right arrow in fig. 9 points). In this embodiment, the fourth operation mode is a normal heating mode in which the first heat exchange device group 16, the heat exchanger 1 and the second heat exchange device group 17 are started simultaneously. When the first heat exchange device group 16 and the heat exchanger 1 form a first heating loop with insufficient refrigerating capacity, the second heat exchange device group 17 can be started to form a second heating loop. Therefore, the first heat exchange equipment group 16, the heat exchanger 1 and the second heat exchange equipment group 17 can simultaneously heat to improve the heating effect.

Fig. 10 is a schematic circuit diagram illustrating an exemplary embodiment of a heat exchange system 15 provided herein in a fifth operating mode. As shown in fig. 10, the heat exchange system 15 includes a fifth mode of operation; in the fifth operation mode, the second port 22, the third port 25, the second port 24, the first heat exchanger 20, the first heat exchange tube 3, the fourth port 26, the first port 23, and the first port 21 are sequentially communicated, and the third port 31, the second heat exchanger 29, the third heat exchanger 30, the sixth port 34, the seventh port 35, and the fourth port 32 are sequentially communicated to form a low-temperature heating loop (as shown in the direction indicated by the arrow in fig. 10). In this embodiment, the fifth operating mode is a low-temperature heating mode in which the first heat exchange device group 16, the heat exchanger 1, and the second heat exchange device group 17 are started simultaneously. The low temperature heating mode is also a cascade circulation mode. Since the environmental temperature in winter in north is very low, for example, the environmental temperature may be lower than-20 ℃, however, when the environmental temperature is lower than-20 ℃, the outlet water temperature of the heat exchange system 15 is generally 45 ℃, and the outlet water temperature of the heat exchange system 15 will decrease with the decrease of the environmental temperature, which results in poor water temperature comfort. Therefore, the heat exchange system 15 needs to start the cascade circulation mode to raise the outlet water temperature of the heat exchange system 15, so as to meet the comfort of water temperature feeling. Specifically, the refrigerant passes through the third port 25 and the second port 24 of the first four-way valve 19 from the first compressor 18, is condensed in the first heat exchanger 20, is evaporated by the first heat exchange tube 3, and finally returns to the first compressor 18 (as shown by the direction of the left arrow in fig. 9), and thus repeatedly circulates. And the refrigerant is condensed from the second compressor 27 through the second heat exchange tube 4, is evaporated through the third heat exchanger 30, passes through the sixth port 34 and the seventh port 35 of the second four-way valve 28, and finally returns to the second compressor 27 (as shown by the direction of the right arrow in fig. 9), thus repeatedly circulating. Therefore, the refrigerant in the second heat exchange device group 17 flows to the second heat exchange tube 4 for condensation, so that higher evaporation temperature can be provided for the first heat exchange tube 3 and the first heat exchange device group 16, and the purpose of low-temperature heating is further realized, and high-temperature hot water is prepared.

In some embodiments, the first heat exchanger 20 includes a first port 38 and a second port 39; the first port 38 is connected with the second port 24; first heat exchange unit set 16 further includes a first expansion device 40. The first expansion device 40 is connected between the second connection 39 and the first nozzle 5 of the first heat exchange tube 3. In this embodiment, by connecting the first expansion device 40 between the first heat exchanger 20 and the first heat exchange tube 3, the first expansion device 40 can be further controlled to be opened to realize the circulation of the refrigerant in the first refrigeration circuit or the first heating circuit, so that the first heat exchange device group 16 and the heat exchanger 1 realize the purpose of normal refrigeration or normal heating; or the first expansion device 40 may be controlled to close to shut off the circulation of refrigerant in the circuit.

In some embodiments, the second heat exchanger 29 includes a third port 41 and a fourth port 42; the third interface 41 is connected to the eighth port 36. The fourth port 42 is connected to the fourth port 8. The third heat exchanger 30 comprises a fifth connection 43 and a sixth connection 44. The fifth port 43 is connected to the sixth port 34. The sixth port 44 is connected to the fourth port 8. The second heat exchange train 17 further comprises a second expansion device 45 and a third expansion device 46, wherein the second expansion device 45 is connected between the second heat exchanger 29 and the third heat exchanger 30; a third expansion device 46 is connected between the fourth port 8 and the third heat exchanger 30. In this embodiment, by connecting the second expansion device 45 between the second heat exchanger 29 and the third heat exchanger 30, and connecting the third expansion device 46 between the third heat exchanger 30 and the second heat exchanging pipe 4, it is further possible to control the second expansion device 45 to be opened and the third expansion device 46 to be closed, so as to circulate the refrigerant among the second compressor 27, the second four-way valve 28, the second heat exchanger 29 and the third heat exchanger 30, so as to realize the circulation of the second refrigeration circuit or the second heating circuit, thereby enabling the second heat exchanging equipment group 17 to realize the purpose of normal refrigeration or normal heating. Alternatively, the refrigerant is circulated among the second compressor 27, the second heat exchange tube 4, the third heat exchanger 30, and the second four-way valve 28 by controlling the second expansion device 45 to be closed and the third expansion device 46 to be opened, so that the circulation of the condensation circuit in the cascade circulation mode is realized.

At the start of the cascade cycle mode, the first expansion device 40 is opened, the third expansion device 46 is opened and the second expansion device 45 is closed. In this way, after the refrigerant flowing to the second heat exchange tube 4 is condensed, a higher evaporation temperature can be provided for the first heat exchange tube 3 and the first heat exchange device group 16, so as to achieve the purpose of low-temperature heating, so as to prepare high-temperature hot water.

In some embodiments, the first expansion device 40 comprises an electronic expansion valve. The second expansion device 45 comprises an electronic expansion valve. The third expansion device 46 comprises an electronic expansion valve.

In some embodiments, the second heat exchange device group 17 further comprises a first control device 47 and a second control device 48, wherein the first control device 47 is connected between the third port 31 and the ground five port 33; the second control means 48 is connected between the third port 31 and the third port 7. In this embodiment, when the heat exchange system 15 is in normal heating or cooling, the first control device 47 is controlled to be opened and the second control device 48 is controlled to be closed, so that the refrigerant in the second compressor 27 can flow to the second four-way valve 28 without flowing into the second heat exchange tube 4. When the heat exchange system 15 is in the low-temperature heating mode, the first control device 47 is controlled to be closed and the second control device 48 is controlled to be opened, so that the refrigerant of the second compressor 27 can flow to the second heat exchange tube 4 without flowing into the second four-way valve 28. Therefore, the structure is simple, and the effect of controlling the flow direction of the refrigerant is good. In some embodiments, the first control device 47 comprises a solenoid valve. The second control means 48 comprise a solenoid valve.

Although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application, and all changes, substitutions and alterations that fall within the spirit and scope of the application are to be understood as being covered by the following claims.

Claims (12)

1. A heat exchanger, comprising:

the heat exchange body comprises a first side and a second side which are oppositely arranged along a first direction;

the first heat exchange tube comprises a first tube opening and a second tube opening, the first heat exchange tube penetrates through the heat exchange body, and the first tube opening and the second tube opening are positioned on the first side of the heat exchange body; and

the second heat exchange tube is arranged in the first heat exchange tube and comprises a third tube orifice and a fourth tube orifice, the second heat exchange tube penetrates through the heat exchange body, and the third tube orifice and the fourth tube orifice are positioned on the first side of the heat exchange body; a first heat exchange channel is formed between the outer wall of the second heat exchange tube and the inner wall of the first heat exchange tube; and a second heat exchange channel is formed inside the second heat exchange tube.

2. The heat exchanger of claim 1, wherein the first heat exchange tube comprises a first tube and a second tube; the first pipe orifice is arranged at the first end of the first pipe body, which is close to the first side of the heat exchange body; the second pipe orifice is arranged at the first end of the second pipe body, which is close to the first side of the heat exchange body; the first pipe body is close to the second end of the second side of the heat exchange body and the second pipe body is close to the second end of the second side of the heat exchange body.

3. A heat exchanger according to claim 2, wherein the first and second tubular bodies are staggered with respect to the heat exchange body along a second direction, the second direction being perpendicular to the first direction.

4. The heat exchanger of claim 2, wherein the first tubular body is disposed in parallel with the second tubular body.

5. The heat exchanger of claim 2, wherein the first heat exchange tube further comprises a first bent tube connected between the second end of the first tube body and the second end of the second tube body, the first bent tube being exposed from the heat exchange body from the second side of the heat exchange body.

6. A heat exchanger according to claim 2, wherein the second heat exchange tube comprises a third tube body and a fourth tube body; the third pipe body is arranged in the first pipe body, and the fourth pipe body is arranged in the second pipe body;

the third pipe orifice is arranged at the first end, close to the first side of the heat exchange body, of the third pipe body; the fourth pipe orifice is arranged at the first end, close to the first side of the heat exchange body, of the fourth pipe body; the second end of the third pipe body close to the second side of the heat exchange body is communicated with the second end of the fourth pipe body close to the second side of the heat exchange body.

7. The heat exchanger of claim 6, wherein the first tubular body is disposed coaxially with the third tubular body; and/or

The second pipe body and the fourth pipe body are coaxially arranged.

8. The heat exchanger of claim 6, wherein the third tube is disposed in parallel with the fourth tube.

9. The heat exchanger of claim 6, wherein the first heat exchange tube further comprises a first bent tube connected between the second end of the first tube body and the second end of the second tube body, the first bent tube being exposed from the heat exchange body from the second side of the heat exchange body;

the second heat exchange tube further comprises a second bent tube connected between the second end of the third tube body and the second end of the fourth tube body, and the second bent tube is arranged in the first bent tube.

10. The heat exchanger of claim 9, wherein the first bent tube is disposed coaxially with the second bent tube.

11. The heat exchanger as recited in claim 1 wherein the first heat exchange tube is plural in number; the number of the second heat exchange tubes corresponds to that of the first heat exchange tubes; one of the first heat exchange tubes is provided with one of the second heat exchange tubes.

12. A heat exchange system comprising a heat exchanger according to any one of claims 1 to 11.

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