Plate heat exchanger, heat exchange device and heat supply system

Abstract

The utility model relates to the technical field of heat exchangers, and particularly discloses a plate heat exchanger, a heat exchange device and a heat supply system. The plate heat exchanger comprises a first flow channel, a second flow channel and a third flow channel which are isolated from one another; the second flow channel comprises a first part second flow channel, a second part second flow channel and a communicating part for communicating the first part second flow channel and the second part second flow channel; the first part of the second flow channel comprises a part of the second flow channel between the second medium inlet and the communicating part; the second part of the second flow channel comprises a part of the second flow channel between the communicating part and the second medium second outlet; a second medium flowing into the second runner of the first part from the second medium inlet can flow to the second medium first outlet and / or the communicating part; the second medium flowing into the second flow channel of the second part from the communicating part can flow to the second medium second outlet; the medium in the first part of the second flow channel exchanges heat with the medium in the first flow channel, and the medium in the second part of the second flow channel exchanges heat with the medium in the third flow channel. The plate heat exchanger can meet user requirements conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, and particularly relates to a plate heat exchanger, a heat exchange device and a heating system. Background Art

[0002] At present, a heat pump system usually includes two independent heat exchangers, which are respectively used for heat exchange between a first medium and a second medium and heat exchange between the second medium and a third medium. For example, heat exchange between a refrigerant and heating water and heat exchange between the refrigerant and domestic water are respectively realized, or heat exchange between the refrigerant and heating water and heat exchange between the heating water and domestic water are respectively realized. However, the use of a dual heat exchanger independent structure results in a large equipment volume and a complex system layout.

[0003] In view of the above problems, no effective solution has been proposed yet. Summary of the Utility Model

[0004] Embodiments of this specification provide a plate heat exchanger, a heat exchange device and a heating system to solve the problems in the prior art that the heat pump system is mainly based on a dual heat exchanger independent structure, resulting in a large equipment volume and a complex system layout.

[0005] Embodiments of this specification provide a plate heat exchanger,

[0006] The plate heat exchanger includes a first flow channel, a second flow channel and a third flow channel that are isolated from each other;

[0007] The first flow channel is used for flowing a first medium;

[0008] The second flow channel is used for flowing a second medium; the second flow channel has a second medium inlet, a first second medium outlet and a second second medium outlet; the second flow channel includes a first part of the second flow channel, a second part of the second flow channel and a connecting part; the connecting part is used for connecting the first part of the second flow channel and the second part of the second flow channel; the first part of the second flow channel includes the part of the second flow channel between the second medium inlet and the connecting part or the first second medium outlet; the second part of the second flow channel includes the part of the second flow channel between the connecting part and the second second medium outlet; the second medium flowing into the first part of the second flow channel from the second medium inlet can flow to the first second medium outlet and / or the connecting part; the second medium flowing into the second part of the second flow channel from the connecting part can flow to the second second medium outlet;

[0009] The third flow channel is used for flowing a third medium;

[0010] The second medium flowing in the second flow channel of the first part can exchange heat with the first medium flowing in the first flow channel, and the second medium flowing in the second flow channel of the second part can exchange heat with the third medium flowing in the third flow channel.

[0011] In one embodiment, the plate heat exchanger includes at least a first plate, a second plate, a third plate, a fourth plate, and a fifth plate; the first plate is adjacent to the second plate; the second plate is adjacent to the third plate, the third plate is adjacent to the fourth plate; the fourth plate is adjacent to the fifth plate; the first plate and the second plate are hermetically connected to form a first cavity between the first plate and the second plate; the second plate and the third plate are hermetically connected to form a second cavity between the second plate and the third plate; the third plate and the fourth plate are hermetically connected to form a third cavity between the third plate and the fourth plate; the fourth plate and the fifth plate are hermetically connected to form a fourth cavity between the fourth plate and the fifth plate.

[0012] In one embodiment, the first cavity constitutes the first flow channel; the second cavity constitutes the first part of the second flow channel; the third cavity constitutes the second part of the second flow channel; the fourth cavity constitutes the third flow channel;

[0013] The first medium flowing in the first cavity can exchange heat with the second medium flowing in the second cavity, and the second medium flowing in the third cavity can exchange heat with the third medium flowing in the fourth cavity.

[0014] In one embodiment, the plate heat exchanger includes at least a first plate, a second plate, a third plate, a fourth plate, a fifth plate, and a sixth plate; the first plate is adjacent to the second plate; the second plate is adjacent to the third plate, the third plate is adjacent to the fourth plate; the fourth plate is adjacent to the fifth plate; the fifth plate is adjacent to the sixth plate; the first plate and the second plate are hermetically connected to form a first cavity between the first plate and the second plate; the second plate and the third plate are hermetically connected to form a second cavity between the second plate and the third plate; the third plate and the fourth plate are hermetically connected to form a third cavity between the third plate and the fourth plate; the fourth plate and the fifth plate are hermetically connected to form a fourth cavity between the fourth plate and the fifth plate; the fifth plate and the sixth plate are hermetically connected to form a fifth cavity between the fifth plate and the sixth plate.

[0015] In one embodiment, the first cavity constitutes the first flow channel; the second cavity constitutes the first part of the second flow channel; the fourth cavity constitutes the second part of the second flow channel; the fifth cavity constitutes the third flow channel;

[0016] The connecting part is disposed in the third cavity, and the second cavity communicates with the fourth cavity through the connecting part;

[0017] The first medium flowing in the first cavity can exchange heat with the second medium flowing in the second cavity, and the second medium flowing in the fourth cavity can exchange heat with the third medium flowing in the fifth cavity.

[0018] In one embodiment, the plate heat exchanger at least includes a first plate, a second plate, a third plate, a fourth plate, a fifth plate, a sixth plate and a seventh plate; the first plate is adjacent to the second plate; the second plate is adjacent to the third plate, and the third plate is adjacent to the fourth plate; the fourth plate is adjacent to the fifth plate; the fifth plate is adjacent to the sixth plate; the sixth plate is adjacent to the seventh plate; the first plate and the second plate are hermetically connected and form a first cavity between the first plate and the second plate; the second plate and the third plate are hermetically connected and form a second cavity between the second plate and the third plate; the third plate and the fourth plate are hermetically connected and form a third cavity between the third plate and the fourth plate; the fourth plate and the fifth plate are hermetically connected and form a fourth cavity between the fourth plate and the fifth plate; the fifth plate and the sixth plate are hermetically connected and form a fifth cavity between the fifth plate and the sixth plate; the sixth plate and the seventh plate are hermetically connected and form a sixth cavity between the sixth plate and the seventh plate.

[0019] In one embodiment, the first cavity constitutes the first flow channel; the second cavity constitutes the first part of the second flow channel; the fifth cavity constitutes the second part of the second flow channel; the sixth cavity constitutes the third flow channel;

[0020] The connecting part is disposed in the third cavity and the fourth cavity, and the second cavity communicates with the fifth cavity through the connecting part;

[0021] The first medium flowing in the first cavity can exchange heat with the second medium flowing in the second cavity, and the second medium flowing in the fifth cavity can exchange heat with the third medium flowing in the sixth cavity.

[0022] In one embodiment, the plate heat exchanger further includes a plurality of heat exchange plates;

[0023] The multiple heat exchange plates are arranged on one side of the first plate away from the second plate along the stacking direction, forming at least one seventh cavity and at least one eighth cavity arranged in an alternating manner. The seventh cavity communicates with the first cavity to form part of the first flow channel, and the eighth cavity communicates with the second cavity to form part of the second flow channel. The first plate and the closest heat exchange plate form the seventh cavity or the eighth cavity; and / or,

[0024] The multiple heat exchange plates are arranged on one side of the seventh plate away from the sixth plate along the stacking direction, forming at least one ninth cavity and at least one tenth cavity arranged in an alternating manner. The tenth cavity communicates with the fifth cavity to form part of the second part of the second flow channel, and the ninth cavity communicates with the sixth cavity to form part of the third flow channel. The seventh plate and the closest heat exchange plate form the ninth cavity or the tenth cavity.

[0025] In one embodiment, the first cavity is adjacent to the eighth cavity, and the first medium flowing in the first cavity can exchange heat with the second medium flowing in the eighth cavity. The first medium flowing in the seventh cavity can exchange heat with the second medium flowing in the eighth cavity;

[0026] and / or, the sixth cavity is adjacent to the tenth cavity, and the second medium flowing in the tenth cavity can exchange heat with the third medium flowing in the sixth cavity. The third medium flowing in the ninth cavity can exchange heat with the second medium flowing in the tenth cavity.

[0027] In one embodiment, at least part of the second medium located on one side of the third plate away from the fourth plate can converge at the inlet of the communication part and flow into the fifth cavity through the communication part.

[0028] In one embodiment, the flow directions of the first medium flowing in the first cavity and the seventh cavity are opposite to the flow directions of the second medium flowing in the second cavity and the eighth cavity; the flow directions of the second medium flowing in the fifth cavity and the tenth cavity are opposite to the flow directions of the third medium flowing in the sixth cavity and the ninth cavity.

[0029] In one embodiment, the flow directions of the second medium flowing in the second cavity and the eighth cavity are opposite to the flow directions of the second medium flowing in the fifth cavity and the tenth cavity; or,

[0030] the flow directions of the second medium flowing in the second cavity and the eighth cavity are the same as the flow directions of the second medium flowing in the fifth cavity and the tenth cavity.

[0031] In one embodiment, a first medium inlet, a first medium outlet, a second medium inlet, and a first second medium outlet are provided on the heat exchange plates at the end of the plate heat exchanger in the stacking direction; a second second medium outlet, a third medium inlet, and a third medium outlet are provided on the heat exchange plates at the other end of the plate heat exchanger.

[0032] In one embodiment, there is at least partial overlap between the projection of the second medium inlet in the stacking direction and the projection of the second second medium outlet in the stacking direction; there is at least partial overlap between the projection of the first second medium outlet in the stacking direction and the projection of the communication part in the stacking direction; there is at least partial overlap between the projection of the first medium inlet in the stacking direction and the projection of the third medium outlet in the stacking direction; there is at least partial overlap between the projection of the first medium outlet in the stacking direction and the projection of the third medium inlet in the stacking direction; or,

[0033] There is at least partial overlap between the projection of the first second medium outlet in the stacking direction and the projection of the second second medium outlet in the stacking direction; there is at least partial overlap between the projection of the second medium inlet in the stacking direction and the projection of the communication part in the stacking direction; there is at least partial overlap between the projection of the first medium inlet in the stacking direction and the projection of the third medium outlet in the stacking direction; there is at least partial overlap between the projection of the first medium outlet in the stacking direction and the projection of the third medium inlet in the stacking direction.

[0034] In one embodiment, four openings are provided on the first plate, the seventh plate, and some of the plurality of heat exchange plates; two openings are provided on the second plate and the sixth plate; only one opening is provided on the third plate, the fourth plate, and the fifth plate, and the openings on the third plate, the fourth plate, and the fifth plate form the communication part;

[0035] All the heat exchange plates arranged on one side of the first plate in the stacking direction and the four openings on the first plate are respectively used to communicate with the first medium inlet, the first medium outlet, the second medium inlet, and the first second medium outlet;

[0036] Some of the heat exchange plates arranged on one side of the seventh plate in the stacking direction and the four openings on the seventh plate are respectively used to communicate with the third medium inlet, the third medium outlet, the second second medium outlet, and the communication part;

[0037] The two openings on the second plate are respectively used to communicate with the second medium inlet and the first outlet of the second medium; the two openings on the sixth plate are respectively used to communicate with the communication part and the second outlet of the second medium.

[0038] In one embodiment, a first medium inlet, a first medium outlet, and a second medium inlet are provided on the heat exchange plates at the end of the plate heat exchanger in the stacking direction; a first outlet of the second medium, a second outlet of the second medium, a third medium inlet, and a third medium outlet are provided on the heat exchange plates at the other end of the plate heat exchanger.

[0039] In one embodiment, there is at least partial overlap between the projection of the second medium inlet in the stacking direction and the projection of the second outlet of the second medium in the stacking direction; there is at least partial overlap between the projection of the first outlet of the second medium in the stacking direction and the projection of the communication part in the stacking direction; there is at least partial overlap between the projection of the first medium inlet in the stacking direction and the projection of the third medium outlet in the stacking direction; there is at least partial overlap between the projection of the first medium outlet in the stacking direction and the projection of the third medium inlet in the stacking direction.

[0040] In one embodiment, four openings are provided on the first plate, the seventh plate, and some of the plurality of heat exchange plates; two openings are provided on the second plate and the sixth plate; only one opening is provided on the third plate, the fourth plate, and the fifth plate, and the openings on the third plate, the fourth plate, and the fifth plate form the communication part;

[0041] Some of the heat exchange plates arranged on one side of the first plate along the stacking direction and the four openings on the first plate are respectively used to communicate with the first medium inlet, the first medium outlet, the second medium inlet, and the communication part;

[0042] All of the heat exchange plates arranged on one side of the seventh plate along the stacking direction and the four openings on the seventh plate are respectively used to communicate with the third medium inlet, the third medium outlet, the first outlet of the second medium, and the second outlet of the second medium;

[0043] The two openings on the second plate are respectively used to communicate with the second medium inlet and the communication part; the two openings on the sixth plate are respectively used to communicate with the first outlet of the second medium and the second outlet of the second medium.

[0044] In one embodiment, the plate heat exchanger includes a first heat exchanger and a second heat exchanger;

[0045] The first heat exchanger includes the first flow channel and the first part of the second flow channel which are isolated from each other;

[0046] The second heat exchanger includes the second part of the second flow channel and the third flow channel which are isolated from each other;

[0047] The second medium inlet and the first outlet of the second medium are provided on the first heat exchanger; the first part of the second flow channel is the flow channel between the second medium inlet and the first outlet of the second medium;

[0048] The communicating part and the second outlet of the second medium are provided on the second heat exchanger; the second part of the second flow channel is the flow channel between the communicating part and the second outlet of the second medium;

[0049] The communicating part is communicated with the first outlet of the second medium.

[0050] The embodiment of the present specification further provides a heat exchange device, including:

[0051] The plate heat exchanger described in any of the above embodiments;

[0052] A flow rate regulating device, which is used to regulate the flow rate of the second medium flowing in the first part of the second flow channel and / or the second part of the second flow channel of the plate heat exchanger.

[0053] In one embodiment, the heat exchange device further includes:

[0054] A first joint, which includes a first interface, a second interface and a third interface; the first interface of the first joint is communicated with the second medium inlet or the first outlet of the second medium through a first communicating pipe, and the second interface of the first joint is communicated with the second outlet of the second medium through a second communicating pipe.

[0055] In one embodiment, the heat exchange device further includes:

[0056] A circulation pump, which can drive the second medium to flow from the second medium inlet of the plate heat exchanger into the first part of the second flow channel and then flow to the first outlet of the second medium and / or the communicating part of the plate heat exchanger, and / or, the circulation pump can drive the second medium to flow from the communicating part into the second part of the second flow channel of the plate heat exchanger and then flow to the second outlet of the second medium.

[0057] In one embodiment, the circulation pump is arranged on the first communicating pipe and / or the second communicating pipe.

[0058] In one embodiment, the flow rate regulating device is arranged on the first communicating pipe and / or the second communicating pipe.

[0059] In one embodiment, the flow regulating device is a solenoid valve, and the solenoid valve can regulate the flow rate of the second medium flowing in the first communication pipe and / or the second communication pipe.

[0060] In one embodiment, the flow regulating device is a three-way valve;

[0061] The first end of the three-way valve is communicated with the second medium inlet or the first outlet of the second medium through a first communication pipe, and the second end of the three-way valve is communicated with the second outlet of the second medium through a second communication pipe. In one embodiment,

[0062] In one embodiment, the heat exchange device further includes:

[0063] A second joint, the first interface of the second joint is communicated with the first outlet of the second medium or the second medium inlet through a third communication pipe;

[0064] A third joint, the first interface of the third joint is communicated with the three-medium inlet of the plate heat exchanger through a fourth communication pipe;

[0065] A fourth joint, the first interface of the fourth joint is communicated with the third medium outlet of the plate heat exchanger through a fifth communication pipe.

[0066] In one embodiment, the heat exchange device further includes:

[0067] A housing for placing the plate heat exchanger and the flow regulating device.

[0068] In one embodiment, the heat exchange device further includes:

[0069] A first joint, the first joint includes a first interface, a second interface and a third interface; the first interface of the first joint is communicated with the second medium inlet or the first outlet of the second medium through a first communication pipe, and the second interface of the first joint is communicated with the second outlet of the second medium through a second communication pipe;

[0070] A second joint, the first interface of the second joint is communicated with the first outlet of the second medium or the second medium inlet through a third communication pipe;

[0071] A third joint, the first interface of the third joint is communicated with the three-medium inlet of the plate heat exchanger through a fourth communication pipe;

[0072] A fourth joint, the first interface of the fourth joint is communicated with the third medium outlet of the plate heat exchanger through a fifth communication pipe;

[0073] The fifth joint, the first interface of the fifth joint is communicated with the first medium inlet of the first flow channel through a sixth connecting pipe;

[0074] The sixth joint, the first interface of the sixth joint is communicated with the first medium outlet of the first flow channel through a seventh connecting pipe.

[0075] In one embodiment, six openings are provided on the housing;

[0076] The third interface of the first joint, the second interface of the second joint, the second interface of the third joint, the second interface of the fourth joint, the second interface of the fifth joint and the second interface of the sixth joint respectively extend out of the housing from the six openings on the housing.

[0077] The embodiment of the present specification further provides a heating system, including:

[0078] The heat exchange device described in any of the above embodiments;

[0079] A heat source, the outlet of the heat source is communicated with the first medium inlet of the first flow channel of the heat exchange device, and the inlet of the heat source is communicated with the first medium outlet of the first flow channel; or, the outlet of the heat source is communicated with the second medium inlet of the second flow channel of the heat exchange device, and the inlet of the heat source is communicated with the first outlet and / or the second outlet of the second medium of the second flow channel.

[0080] In one embodiment, when the outlet of the heat source is communicated with the first medium inlet of the first flow channel of the heat exchange device, and the inlet of the heat source is communicated with the first medium outlet of the first flow channel,

[0081] The second medium inlet of the second flow channel of the heat exchange device is communicated with the outlet of the first end, and the first outlet of the second medium of the second flow channel of the heat exchange device is communicated with the inlet of the first end; the third medium inlet of the third flow channel of the heat exchange device is communicated with the outlet of the second end, and the third medium outlet of the third flow channel of the heat exchange device is communicated with the inlet of the second end.

[0082] In one embodiment, when the outlet of the heat source is communicated with the second medium inlet of the second flow channel of the heat exchange device, and the inlet of the heat source is communicated with the first outlet and / or the second outlet of the second medium of the second flow channel,

[0083] The first medium inlet of the first flow channel of the heat exchange device is communicated with the outlet of the first end, and the first medium outlet of the first flow channel of the heat exchange device is communicated with the inlet of the first end; the third medium inlet of the third flow channel of the heat exchange device is communicated with the outlet of the second end, and the third medium outlet of the third flow channel of the heat exchange device is communicated with the inlet of the second end.

[0084] In one embodiment, the first end and / or the second end is an end for domestic hot water or a heating end.

[0085] In one embodiment, the heat source includes at least one of the following: a gas water heater, an electric water heater, a solar water heater, a heat pump device;

[0086] The first end is a heating end and the second end is an end for domestic water, or the first end is an end for domestic water and the second end is a heating end.

[0087] In one embodiment, the end for domestic water is a water tank, and the water tank includes a cold water inlet, a hot water outlet, a cold water outlet, and a hot water inlet; the cold water outlet of the water tank is communicated with the third medium inlet of the third flow channel, the hot water inlet of the water tank is communicated with the third medium outlet of the third flow channel, and the cold water inlet is communicated with a water source.

[0088] In one embodiment, the heat exchange device is arranged inside the housing of the heat source;

[0089] The outlet and the inlet of the heat source are respectively communicated with the first medium inlet and the first medium outlet of the first flow channel of the heat exchange device through a connecting pipe inside the housing of the heat source; or, the outlet and the inlet of the heat source are respectively communicated with the second medium inlet and the first outlet and / or the second outlet of the second medium of the second flow channel of the heat exchange device through a connecting pipe outside the housing of the heat source.

[0090] In one embodiment, the heat exchange device is arranged outside the housing of the heat source;

[0091] The outlet and the inlet of the heat source are respectively communicated with the first medium inlet and the first medium outlet of the first flow channel of the heat exchange device through a connecting pipe outside the housing of the heat source; or, the outlet and the inlet of the heat source are respectively communicated with the second medium inlet and the first outlet and / or the second outlet of the second medium of the second flow channel of the heat exchange device through a connecting pipe outside the housing of the heat source.

[0092] In one embodiment, the heat exchange device is arranged inside the housing of the heat source;

[0093] The housing of the heat source includes at least four openings, and the four openings are respectively used for the third opening of the first joint of the heat exchange device, the second opening of the second joint, the second opening of the third joint, and the second opening of the fourth joint to extend out of the housing of the heat source.

[0094] In one embodiment, the heat exchange device is arranged inside the housing of the heat source;

[0095] The housing of the heat source includes at least four openings, and the four openings are respectively used for the second openings of the third joint, the fourth joint, the fifth joint, and the sixth joint of the heat exchange device to extend out of the housing of the heat source.

[0096] The technical solution of this specification has the following remarkable beneficial effects:

[0097] Through the plate heat exchanger in this application, a first flow channel, a second flow channel, and a third flow channel can be arranged in an integrated heat exchanger. The second flow channel can include a first part of the second flow channel, a second part of the second flow channel, and a connecting part. The connecting part is used to connect the first part of the second flow channel and the second part of the second flow channel. Heat exchange can occur between the first medium in the first flow channel and the second medium flowing in the first part of the second flow channel, and heat exchange can also occur between the second medium in the second part of the second flow channel and the third medium flowing in the third flow channel. Two heat exchanges can be achieved in one heat exchanger, which is convenient for meeting the user's water use needs, heating needs, or refrigeration needs. Moreover, it is small in size and convenient for assembly. Further, by setting the second flow channel to include a first part of the second flow channel and a second part of the second flow channel, it is convenient to adjust the flow rate of the second medium flowing in the first part of the second flow channel and the second part of the second flow channel. Thus, the flow rate of the second medium exchanging heat with the first medium in the first flow channel and the flow rate of the second medium exchanging heat with the third medium in the third flow channel can be adjusted, which is convenient for heat distribution according to user needs and can better meet the user's water use needs, heating needs, and / or refrigeration needs.

[0098] Referring to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the ways in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope thereby. Features described and / or illustrated for one embodiment can be used in the same or similar way in one or more other embodiments, combined with the features in other embodiments, or replace the features in other embodiments.

[0099] It should be emphasized that the term "comprising / including" when used herein refers to the presence of features, components, steps, or assemblies, but does not exclude the presence or addition of one or more other features, components, steps, or assemblies. BRIEF DESCRIPTION OF THE DRAWINGS

[0100] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure of the present utility model in any way. Additionally, the shapes and proportional dimensions of the various components in the drawings are merely schematic and are used to assist in the understanding of the present utility model, rather than specifically defining the shapes and proportional dimensions of the various components of the present utility model. Those skilled in the art can, under the teachings of the present utility model, select various possible shapes and proportional dimensions according to specific circumstances to implement the present utility model. In the accompanying drawings:

[0101] Figure 1 shows a schematic structural diagram of a plate heat exchanger in an embodiment of the present specification;

[0102] Figure 2 shows a schematic structural diagram of a plate heat exchanger in an embodiment of the present specification;

[0103] Figure 3 shows a schematic structural diagram of a plate heat exchanger in an embodiment of the present specification;

[0104] Figure 4 shows a schematic structural diagram of a plate heat exchanger in an embodiment of the present specification;

[0105] Figure 5 shows a schematic structural diagram of a plate heat exchanger in an embodiment of the present specification;

[0106] Figure 6 shows a schematic structural diagram of a plate heat exchanger in an embodiment of the present specification;

[0107] Figure 7 shows a schematic structural diagram of a plate heat exchanger in an embodiment of the present specification;

[0108] Figure 8 shows a schematic structural diagram of a plate heat exchanger in an embodiment of the present specification;

[0109] Figure 9 shows an exploded view of a plate heat exchanger in an embodiment of the present specification;

[0110] Figure 10 shows an exploded view of a plate heat exchanger in an embodiment of the present specification;

[0111] Figure 11 shows an exploded view of a plate heat exchanger in an embodiment of the present specification;

[0112] Figure 12 shows a schematic structural diagram of a plate heat exchanger in an embodiment of the present specification;

[0113] Figure 13 shows a schematic structural diagram of a plate heat exchanger in an embodiment of the present specification;

[0114] Figure 14 Shows a schematic structural diagram of a plate heat exchanger in an embodiment of this specification;

[0115] Figure 15 Shows a schematic structural diagram of a heat exchange device in an embodiment of this specification;

[0116] Figure 16 Shows a schematic structural diagram of a heat exchange device in an embodiment of this specification;

[0117] Figure 17 Shows a schematic structural diagram of a heat exchange device in an embodiment of this specification;

[0118] Figure 18 Shows a schematic structural diagram of a heat exchange device in an embodiment of this specification;

[0119] Figure 19 Shows a schematic structural diagram of a heat exchange device in an embodiment of this specification;

[0120] Figure 20 Shows a schematic structural diagram of a heat exchange device in an embodiment of this specification;

[0121] Figure 21 Shows a schematic structural diagram of a heat exchange device in an embodiment of this specification;

[0122] Figure 22 Shows a schematic structural diagram of a heat exchange device in an embodiment of this specification;

[0123] Figure 23 Shows a schematic structural diagram of a heat exchange device in an embodiment of this specification;

[0124] Figure 24 Shows a schematic structural diagram of a heat exchange device in an embodiment of this specification;

[0125] Figure 25 Shows a schematic structural diagram of a heating system in an embodiment of this specification;

[0126] Figure 26 Shows a schematic structural diagram of a heating system in an embodiment of this specification;

[0127] Figure 27 Shows a schematic structural diagram of a heating system in an embodiment of this specification;

[0128] Figure 28 Shows a schematic structural diagram of a heating system in an embodiment of this specification;

[0129] Figure 29 Shows a schematic structural diagram of a heating system in an embodiment of this specification;

[0130] Figure 30 It shows a schematic structural diagram of a heating system in an embodiment of this specification;

[0131] Figure 31 It shows a schematic structural diagram of a heating system in an embodiment of this specification;

[0132] Figure 32 It shows a schematic structural diagram of a heating system in an embodiment of this specification;

[0133] Figure 33 It shows a schematic structural diagram of a heating system in an embodiment of this specification.

[0134] Reference numerals of the above drawings:

[0135] 10. Heat exchange device; 11. First flow channel; 111. First medium inlet; 112. First medium outlet; 121. First part of the second flow channel; 122. Second part of the second flow channel; 123. Connecting part; 124. Second medium inlet; 125. First second medium outlet; 126. Second second medium outlet; 127. First second medium inlet; 127. Second second medium inlet; 129. Second medium outlet; 13. Third flow channel; 14. First heat exchanger; 15. Second heat exchanger; 131. Third medium inlet; 132. Third medium outlet; 101. First plate; 102. Second plate; 103. Third plate; 104. Fourth plate; 105. Fifth plate; 106. Sixth plate; 107. Seventh plate; 108. Heat exchange plate; 110. First cavity; 120. Second cavity; 130. Third cavity; 140. Fourth cavity; 150. Fifth cavity; 160. Sixth cavity; 170. Seventh cavity; 180. Eighth cavity; 190. Ninth cavity; 1100. Tenth cavity;

[0136] 20. Flow regulating device; 30. Circulation pump; 40. Housing of the heat exchange device; 41. First joint; 42. Second joint; 43. Third joint; 44. Fourth joint; 45. Fifth joint; 46. Sixth joint;

[0137] 100. Heat source; 200. First terminal; 300. Second terminal; 400. Housing of the heat source; 500. Water source; 1001. Compressor; 1002. Expansion valve; 1003. Evaporator and condenser; 1004. Reversing valve; 301. Cold water inlet; 302. Hot water outlet; 303. Cold water outlet; 304. Hot water inlet. Detailed implementation manners

[0138] The principles and spirit of this specification will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and then implement this specification, rather than limiting the scope of this specification in any way. On the contrary, these embodiments are provided to make the disclosure of this specification more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0139] Combined with the description of the accompanying drawings and the specific embodiments of the present invention, the details of the present invention can be more clearly understood. However, the specific embodiments of the present invention described herein are only for the purpose of explaining the present invention and cannot be understood in any way as a limitation of the present invention. Under the teaching of the present invention, those skilled in the art can conceive any possible variations based on the present invention, and these should all be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the communication inside two elements. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0140] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this specification belongs. The terms used herein in this specification are only for the purpose of describing specific embodiments and are not intended to limit this specification. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0141] The embodiments of this specification provide a plate heat exchanger. Please refer to Figures 1 to 4 , which shows a schematic structural diagram of the plate heat exchanger in the embodiments of this specification.

[0142] As Figures 1 to 4As shown, the plate heat exchanger 10 may include a first flow channel 11, a second flow channel 12, and a third flow channel 13 that are isolated from each other. The first flow channel 11 is used for the first medium to flow through. The second flow channel 12 is used for the second medium to flow through. The third flow channel 13 is used for the third medium to flow through. Among them, the first medium, the second medium, and the third medium may be the same heat exchange medium or different heat exchange mediums. The heat exchange medium may be water, refrigerant, or other mediums.

[0143] The second flow channel 12 may have a second medium inlet 124, a first second medium outlet 125, and a second second medium outlet 126. The second flow channel 12 may include a first part of the second flow channel 121, a second part of the second flow channel 122, and a connecting portion 123. The connecting portion 123 is used to connect the first part of the second flow channel 121 and the second part of the second flow channel 122.

[0144] The first part of the second flow channel 121 may include the part of the second flow channel 12 between the second medium inlet 124 and the connecting portion 123 or the first second medium outlet 125. As Figures 1 to 4 shown, the first part of the second flow channel 121 may include the part of the second flow channel 12 from the second medium inlet 124 via the connecting portion 123 to the first second medium outlet 125.

[0145] As Figures 1 to 4 shown, the second part of the second flow channel 122 may include the part of the second flow channel 12 between the connecting portion 123 and the second second medium outlet 126. Among them, the connecting portion 123 may be a connecting port, a connecting channel, or a connecting cavity.

[0146] The second medium flowing into the first part of the second flow channel 121 from the second medium inlet 124 can flow to the first second medium outlet 125 and / or the connecting portion 123. The second medium flowing into the second part of the second flow channel 122 from the connecting portion 123 can flow to the second second medium outlet 126.

[0147] The second medium flowing in the first part of the second flow channel 121 can exchange heat with the first medium flowing in the first flow channel 11, and the second medium flowing in the second part of the second flow channel 122 can exchange heat with the third medium flowing in the third flow channel 13.

[0148] In the above embodiments, the first flow channel 11, the second flow channel 12, and the third flow channel 13 can be provided in an integrated heat exchanger. The second flow channel 12 can include a first part of the second flow channel 121, a second part of the second flow channel 122, and a connecting part 123. The connecting part 123 is used to connect the first part of the second flow channel 121 and the second part of the second flow channel 122. Heat exchange can occur between the first medium in the first flow channel 11 and the second medium flowing in the first part of the second flow channel 121, and heat exchange can also occur between the second medium in the second part of the second flow channel 122 and the third medium flowing in the third flow channel 13. Two types of heat exchange can be achieved in one heat exchanger, which is convenient for meeting the user's water use needs, heating needs, or cooling needs. Moreover, it has a small volume and is convenient for assembly. Further, by setting the second flow channel 12 to include the first part of the second flow channel 121 and the second part of the second flow channel 122, it is convenient to adjust the flow rate of the second medium flowing in the first part of the second flow channel 121 and the second part of the second flow channel 122. Thus, the flow rate of the second medium exchanging heat with the first medium in the first flow channel 11 and the flow rate of the second medium exchanging heat with the third medium in the third flow channel 13 can be adjusted, which can better meet the user's water use needs, heating needs, and / or cooling needs.

[0149] As Figure 2 shown, the first part of the second flow channel 121 and the second part of the second flow channel 122 can be adjacent. As Figure 1 shown, there is a third flow channel 13 between the first part of the second flow channel 121 and the second part of the second flow channel 122. The present application does not limit this.

[0150] Please refer to Figures 5 to 8 , which shows a schematic diagram of the flow channels in the plate heat exchanger 10 in the embodiments of this specification.

[0151] As Figure 5As shown, in some embodiments of this specification, the plate heat exchanger 10 may at least include a first plate 101, a second plate 102, a third plate 103, a fourth plate 104, and a fifth plate 105. The first plate 101 is disposed adjacent to the second plate 102. The second plate 102 is disposed adjacent to the third plate 103, the third plate 103 is disposed adjacent to the fourth plate 104, and the fourth plate 104 is disposed adjacent to the fifth plate 105. The first plate 101 and the second plate 102 are sealingly connected and form a first chamber 110 therebetween. The second plate 102 and the third plate 103 are sealingly connected and form a second chamber 120 therebetween. The third plate 103 and the fourth plate 104 are sealingly connected and form a third chamber 130 therebetween. The fourth plate 104 and the fifth plate 105 are sealingly connected and form a fourth chamber 140 therebetween. In the above manner, a plate heat exchanger can be formed by at least five plates.

[0152] As Figure 5 shown, in some embodiments of this specification, the first chamber 110 constitutes a first flow channel 11. The second chamber 120 constitutes a first part of a second flow channel 121. The third chamber 130 constitutes a second part of the second flow channel 122. The fourth chamber 140 constitutes a third flow channel 13. The first medium flowing in the first chamber 110 and the second medium flowing in the second chamber 120 can perform heat exchange, and the second medium flowing in the third chamber 130 and the third medium flowing in the fourth chamber 140 can perform heat exchange. In this embodiment, the second chamber 120 and the third chamber 130 are adjacent and both are used for flowing the second medium, which can reduce the mutual influence between the first medium in the first chamber 110 and the third medium in the fourth chamber 140.

[0153] As Figure 6As shown, in some embodiments of this specification, the plate heat exchanger 10 may at least include a first plate 101, a second plate 102, a third plate 103, a fourth plate 104, a fifth plate 105, and a sixth plate 106. The first plate 101 is disposed adjacent to the second plate 102. The second plate 102 is disposed adjacent to the third plate 103, and the third plate 103 is disposed adjacent to the fourth plate 104. The fourth plate 104 is disposed adjacent to the fifth plate 105. The fifth plate 105 is disposed adjacent to the sixth plate 106. The first plate 101 and the second plate 102 are sealingly connected and form a first chamber 110 therebetween. The second plate 102 and the third plate 103 are sealingly connected and form a second chamber 120 therebetween. The third plate 103 and the fourth plate 104 are sealingly connected and form a third chamber 130 therebetween. The fourth plate 104 and the fifth plate 105 are sealingly connected and form a fourth chamber 140 therebetween. The fifth plate 105 and the sixth plate 106 are sealingly connected and form a fifth chamber 150 therebetween. In the above manner, a plate heat exchanger can be formed by at least six plates.

[0154] As Figure 6 shown, in some embodiments of this specification, the first chamber 110 constitutes a first part of the first flow channel 11. The second chamber 120 constitutes a first part of the second flow channel 121. The fourth chamber 140 constitutes a second part of the second flow channel 122. The fifth chamber 150 constitutes the third flow channel 13. A connecting portion 123 is disposed in the third chamber 130, and the second chamber 120 and the fourth chamber 140 are connected through the connecting portion 123. The first medium flowing in the first chamber 110 and the second medium flowing in the second chamber 120 can perform heat exchange, and the second medium flowing in the fourth chamber 140 and the third medium flowing in the fifth chamber 150 can perform heat exchange. In this embodiment, the second chamber 120 and the fourth chamber 140 are used for flowing the second medium, and a third chamber 130 is provided between the second chamber 120 and the fourth chamber 140. Only the connecting portion 123 for connecting the first part of the second flow channel 121 and the second part of the second flow channel 122 is disposed in the third chamber 130. By providing the third chamber 130, the mutual influence between the first medium in the first chamber 110 and the third medium in the fifth chamber 150 can be further reduced.

[0155] As Figure 7 and Figure 8As shown, in some embodiments of this specification, the plate heat exchanger 10 may at least include a first plate 101, a second plate 102, a third plate 103, a fourth plate 104, a fifth plate 105, a sixth plate 106, and a seventh plate 107. The first plate 101 is adjacent to the second plate 102. The second plate 102 is adjacent to the third plate 103, and the third plate 103 is adjacent to the fourth plate 104. The fourth plate 104 is adjacent to the fifth plate 105. The fifth plate 105 is adjacent to the sixth plate 106. The sixth plate 106 is adjacent to the seventh plate 107. The first plate 101 and the second plate 102 are sealingly connected and form a first chamber 110 between the first plate 101 and the second plate 102. The second plate 102 and the third plate 103 are sealingly connected and form a second chamber 120 between the second plate 102 and the third plate 103. The third plate 103 and the fourth plate 104 are sealingly connected and form a third chamber 130 between the third plate 103 and the fourth plate 104. The fourth plate 104 and the fifth plate 105 are sealingly connected and form a fourth chamber 140 between the fourth plate 104 and the fifth plate 105. The fifth plate 105 and the sixth plate 106 are sealingly connected and form a fifth chamber 150 between the fifth plate 105 and the sixth plate 106. The sixth plate 106 and the seventh plate 107 are sealingly connected and form a sixth chamber 160 between the sixth plate 106 and the seventh plate 107. In the above manner, a plate heat exchanger can be formed by at least seven plates.

[0156] As Figure 7 and Figure 8 shown, in some embodiments of this specification, the first chamber 110 constitutes a first flow channel 11. The second chamber 120 constitutes a first part of a second flow channel 121. The fifth chamber 150 constitutes a second part of the second flow channel 122. The sixth chamber 160 constitutes a third flow channel 13. A connecting portion 123 is disposed in the third chamber 130 and the fourth chamber 140, and the second chamber 120 communicates with the fifth chamber 150 through the connecting portion 123. The first medium flowing in the first chamber 110 can exchange heat with the second medium flowing in the second chamber 120, and the second medium flowing in the fifth chamber 150 can exchange heat with the third medium flowing in the sixth chamber 160. In this embodiment, the second chamber 120 and the fifth chamber 150 are used for flowing the second medium, and there are a third chamber 130 and a fourth chamber 140 between the second chamber 120 and the fifth chamber 150. Only the connecting portion 123 for connecting the first part of the second flow channel 121 and the second part of the second flow channel 122 is disposed in the third chamber 130 and the fourth chamber 140. By providing the third chamber 130 and the fourth chamber 140, the mutual influence between the first medium in the first chamber 110 and the third medium in the sixth chamber 160 can be further reduced.

[0157] As Figure 7 and Figure 8As shown, in some embodiments of this specification, the plate heat exchanger 10 may further include a plurality of heat exchange plates 108. The plurality of heat exchange plates 108 may be arranged on a side of the first plate 101 away from the second plate 102 along the stacking direction, forming at least one seventh chamber 170 and at least one eighth chamber 180 arranged in an alternating manner. The seventh chamber 170 communicates with the first chamber 110 to form a part of the first flow channel 11, and the eighth chamber 180 communicates with the second chamber 120 to form a part of the first part of the second flow channel 121. The first plate 101 and the closest heat exchange plate 108 form the seventh chamber 170 or the eighth chamber 180.

[0158] As Figure 7 and Figure 8 As shown, in some embodiments of this specification, the plate heat exchanger 10 may further include a plurality of heat exchange plates 108. The plurality of heat exchange plates 108 may also be arranged on a side of the seventh plate 107 away from the sixth plate 106 along the stacking direction, forming at least one ninth chamber 190 and at least one tenth chamber 1100 arranged in an alternating manner. The tenth chamber 1100 communicates with the fifth chamber 150 to form a part of the second part of the second flow channel 122, and the ninth chamber 190 communicates with the sixth chamber 160 to form a part of the third flow channel 13. The seventh plate 107 and the closest heat exchange plate 108 form the ninth chamber 190 or the tenth chamber 1100.

[0159] As Figure 7 and Figure 8 As shown, in some embodiments of this specification, the first chamber 110 is adjacent to the eighth chamber 180, and the first medium flowing in the first chamber 110 can exchange heat with the second medium flowing in the eighth chamber 180. The first medium flowing in the seventh chamber 170 can exchange heat with the second medium flowing in the eighth chamber 180.

[0160] As Figure 7 and Figure 8 As shown, in some embodiments of this specification, the sixth chamber 160 is adjacent to the tenth chamber 1100, and the second medium flowing in the tenth chamber 1100 can exchange heat with the third medium flowing in the sixth chamber 160. The third medium flowing in the ninth chamber 190 can exchange heat with the second medium flowing in the tenth chamber 1100.

[0161] As Figure 7 and Figure 8 As shown, in some embodiments of this specification, in some embodiments of this specification, at least part of the second medium located on a side of the third plate 103 away from the fourth plate 104 can converge at the inlet of the connecting portion 123 and flow into the fifth chamber 150 through the connecting portion 123.

[0162] As Figure 7 and Figure 8As shown, in some embodiments of the present specification, the flow direction of the first medium flowing in the first chamber 110 and the seventh chamber 170 is opposite to the flow direction of the second medium flowing in the second chamber 120 and the eighth chamber 180. The flow direction of the second medium flowing in the fifth chamber 150 and the tenth chamber 1100 is opposite to the flow direction of the third medium flowing in the sixth chamber 160 and the ninth chamber 190. By countercurrent heat exchange, the heat exchange efficiency between the heat exchange media can be improved.

[0163] As Figure 7 shown, in some embodiments of the present specification, the flow direction of the second medium flowing in the second chamber 120 and the eighth chamber 180 is opposite to the flow direction of the second medium flowing in the fifth chamber 150 and the tenth chamber 1100.

[0164] As Figure 8 shown, in some embodiments of the present specification, the flow direction of the second medium flowing in the second chamber 120 and the eighth chamber 180 is the same as the flow direction of the second medium flowing in the fifth chamber 150 and the tenth chamber 1100.

[0165] Please refer to Figures 9 to 11 , which shows an exploded view of the plate heat exchanger 10 in the embodiments of the present specification.

[0166] As Figure 9 and Figure 10 shown, in some embodiments of the present specification, on the heat exchange plates 108 at the ends of the plate heat exchanger 10 in the stacking direction, a first medium inlet 111, a first medium outlet 112, a second medium inlet 124, and a first second medium outlet 125 are provided. On the heat exchange plates 108 at the other end of the plate heat exchanger 10, a second second medium outlet 126, a third medium inlet 131, and a third medium outlet 132 are provided.

[0167] As Figure 9 shown, in some embodiments of the present specification, there is at least partial overlap between the projection of the second medium inlet 124 in the stacking direction and the projection of the second second medium outlet 126 in the stacking direction. There is at least partial overlap between the projection of the first second medium outlet 125 in the stacking direction and the projection of the connecting portion 123 in the stacking direction. There is at least partial overlap between the projection of the first medium inlet 111 in the stacking direction and the projection of the third medium outlet 132 in the stacking direction. There is at least partial overlap between the projection of the first medium outlet 112 in the stacking direction and the projection of the third medium inlet 131 in the stacking direction. By setting it to be partially overlapped, it is convenient for the connection between the inlets, outlets, and connecting ports.

[0168] As Figure 10As shown, in some embodiments of this specification, there is at least partial overlap between the projection of the first outlet 125 of the second medium in the stacking direction and the projection of the second outlet 126 of the second medium in the stacking direction. There is at least partial overlap between the projection of the second medium inlet 124 in the stacking direction and the projection of the communication part 123 in the stacking direction. There is at least partial overlap between the projection of the first medium inlet 111 in the stacking direction and the projection of the third medium inlet 131 in the stacking direction. There is at least partial overlap between the projection of the first medium outlet 112 in the stacking direction and the projection of the third medium outlet 132 in the stacking direction. By setting it to be partially overlapped, it is convenient for the communication between the inlets, outlets and communication ports.

[0169] As Figure 9 and Figure 10 As shown, in some embodiments of this specification, four openings are provided on each of the first plate 101, the seventh plate 107 and some of the plurality of heat exchange plates 108. Two openings are provided on each of the second plate 102 and the sixth plate 106. Only one opening is provided on each of the third plate 103, the fourth plate 104 and the fifth plate 105. The openings on the third plate 103, the fourth plate 104 and the fifth plate 105 form the communication part 123. All the heat exchange plates 108 arranged on one side of the first plate 101 along the stacking direction and the four openings on the first plate 101 are respectively used to communicate with the first medium inlet 111, the first medium outlet 112, the second medium inlet 124 and the first outlet 125 of the second medium. Some of the heat exchange plates 108 arranged on one side of the seventh plate 107 along the stacking direction and the four openings on the seventh plate 107 are respectively used to communicate with the third medium inlet 131, the third medium outlet 132, the second outlet 126 of the second medium and the communication part 123. The two openings on the second plate 102 are respectively used to communicate with the second medium inlet 124 and the first outlet 125 of the second medium. The two openings on the sixth plate 106 are respectively used to communicate with the communication part 123 and the second outlet 126 of the second medium.

[0170] As Figure 11 As shown, in some embodiments of this specification, the first medium inlet 111, the first medium outlet 112, the first outlet 125 of the second medium and the second outlet 126 of the second medium are provided on the heat exchange plates 108 at the end of the plate heat exchanger 10 in the stacking direction. The second medium inlet 124, the third medium inlet 131 and the third medium outlet 132 are provided on the heat exchange plates 108 at the other end of the plate heat exchanger 10.

[0171] As Figure 11As shown, in some embodiments of this specification, there is at least partial overlap between the projection of the second medium inlet 124 in the stacking direction and the projection of the second medium second outlet 126 in the stacking direction. There is at least partial overlap between the projection of the first second medium outlet 125 in the stacking direction and the projection of the communication part 123 in the stacking direction. There is at least partial overlap between the projection of the first medium inlet 111 in the stacking direction and the projection of the third medium outlet 132 in the stacking direction. There is at least partial overlap between the projection of the first medium outlet 112 in the stacking direction and the projection of the third medium inlet 131 in the stacking direction. By setting it to be partially overlapped, it is convenient for the communication between the inlets, outlets and communication ports.

[0172] As Figure 11 As shown, in some embodiments of this specification, four openings are provided on each of the first plate 101, the seventh plate 107 and some of the plurality of heat exchange plates 108. Two openings are provided on each of the second plate 102 and the sixth plate 106. Only one opening is provided on each of the third plate 103, the fourth plate 104 and the fifth plate 105. The openings on the third plate 103, the fourth plate 104 and the fifth plate 105 form the communication part 123. Some of the heat exchange plates 108 arranged on the side of the first plate 101 away from the second plate 102 and the four openings on the first plate 101 along the stacking direction are respectively used to communicate with the third medium inlet 131, the third medium outlet 132, the second medium inlet 124 and the communication part 123. All of the heat exchange plates 108 arranged on the side of the seventh plate 107 away from the sixth plate 106 and the four openings on the seventh plate 107 along the stacking direction are respectively used to communicate with the first medium inlet 111, the first medium outlet 112, the first second medium outlet 125 and the second medium second outlet 126. The two openings on the second plate 102 are respectively used to communicate with the second medium inlet 124 and the communication part 123. The two openings on the sixth plate 106 are respectively used to communicate with the first second medium outlet 125 and the second medium second outlet 126.

[0173] In as Figure 9In the plate heat exchanger shown, in one embodiment, the first medium is a refrigerant. The second medium is heating water. The third medium is domestic water. Correspondingly, the first flow channel 11 communicates with the inlet and outlet of the heat pump. The second flow channel communicates with the inlet and outlet of the heating terminal. The third flow channel 13 communicates with the inlet and outlet of the domestic hot water terminal. In this embodiment, the heating water after exchanging heat with the refrigerant can heat the domestic water, that is to say, the refrigerant indirectly heats the domestic water rather than directly heating the domestic water. The specific reasons are as follows. Plate heat exchangers in the field of heat pump refrigerants are generally brazed plate heat exchangers resistant to high refrigerant pressure, and the thickness of their plates is usually between 0.4 mm and 0.6 mm. This range is mainly determined by the working pressure requirements of the plate heat exchanger during operation. During the process of using the plate heat exchanger to exchange heat between the refrigerant and domestic water, there are certain risks, which are described in detail below.

[0174] From the perspective of corrosion risk, since tap water contains a certain amount of active chloride ions, if tap water directly exchanges heat with the refrigerant through the plate heat exchanger and is heated into domestic hot water for a long time, the relatively thin stainless steel sheets (304 or 316) inside the plate heat exchanger and the copper-based brazing flux will soon be corroded and rusted through, resulting in refrigerant leakage in the refrigeration system and abnormal system state of the water inlet, and thus also causing the complete scrapping of the heat pump host system, resulting in huge losses.

[0175] From the perspective of the risk of scale formation in the water side channel of the plate heat exchanger, since there is superheated gaseous refrigerant (exceeding 80 - 100 degrees) in the high-pressure side refrigerant of the heat pump system, during the heat exchange process with a relatively small flow rate on the domestic water side, if the domestic water is a water source with relatively hard water quality (higher calcium and magnesium ion concentration), it is easier to form scale on the inner surface of the water side channel of the plate heat exchanger, resulting in reduced heat exchange efficiency, increased over-temperature risk, scale accumulation blocking the channel, attenuation of the operating capacity of the heat pump system and significant reduction of energy efficiency, leading to the failure of the capacity of the plate heat exchanger.

[0176] From the perspective of the risk of safe operating pressure of the equipment, during the use of the plate heat exchanger, when the pressure fluctuation and water hammer impact on the tap water side are relatively large, if the heat exchange plates are deformed and aged, it may cause the heat exchanger to malfunction, and then trigger safety problems such as water leakage and refrigerant leakage, and there is a risk of refrigerant contamination of the water quality.

[0177] Therefore, in the above embodiment, the refrigerant does not directly exchange heat with the domestic water, which can avoid the corrosion of the heat exchanger by the active chloride ions in the domestic water, reduce the risk of scale formation in the water side channel of the plate heat exchanger, and can also reduce the pressure risk of safe operation of the equipment, which helps to extend the service life of the plate heat exchanger.

[0178] In such as Figure 9In the plate heat exchanger shown, in another embodiment, the first medium is heating water, the second medium is refrigerant, and the third medium is domestic water. Correspondingly, the first flow channel 11 communicates with the inlet and outlet of the heating end. The second flow channel communicates with the inlet and outlet of the heat pump. The third flow channel 13 communicates with the inlet and outlet of the domestic hot water end.

[0179] In the plate heat exchanger as Figure 10 shown, in one embodiment, the first medium is heating water, the second medium is refrigerant, and the third medium is domestic water. Correspondingly, the first flow channel 11 communicates with the inlet and outlet of the heating end. The second flow channel communicates with the inlet and outlet of the heat pump. The third flow channel 13 communicates with the inlet and outlet of the domestic hot water end.

[0180] In the plate heat exchanger as Figure 11 shown, in one embodiment, the first medium is domestic water, the second medium is refrigerant, and the third medium is heating water. Correspondingly, the first flow channel 11 communicates with the inlet and outlet of the domestic hot water end. The second flow channel communicates with the inlet and outlet of the heat pump. The third flow channel 13 communicates with the inlet and outlet of the heating end.

[0181] In the plate heat exchanger in the above embodiments, the second flow channel all has a second medium inlet, a first second medium outlet and a second second medium outlet, that is, the second flow channel has one medium inlet and two medium outlets. It can be understood that the second flow channel of the plate heat exchanger in the embodiments of this specification can also include two medium inlets and one medium outlet, that is to say, the second flow channel has a first second medium inlet, a second second medium inlet and a second medium outlet. From the structure of the plate heat exchanger, the outlets and inlets of the second medium are all openings for the second medium to flow through. Therefore, the structure of the plate heat exchanger in the above embodiments can also achieve the function of the second flow channel having two medium inlets and one medium outlet. In this case, the second flow channel can also include a first part of the second flow channel, a second part of the second flow channel and a connecting part for connecting the first part of the second flow channel and the second part of the second flow channel. Please refer to Figure 12 and 13 , which show the schematic structural diagrams of the plate heat exchanger in some embodiments of this specification. As Figure 12 and Figure 13As shown, the plate heat exchanger 10 may include a first flow channel 11, a second flow channel, and a third flow channel 13 that are isolated from each other. The first flow channel 11 is used for flowing a first medium. The second flow channel is used for flowing a second medium. The second flow channel includes a first part of the second flow channel 121, a second part of the second flow channel 122, and a connecting part 123 for connecting the first part of the second flow channel 121 and the second part of the second flow channel 122. The second flow channel has a first second-medium inlet 127, a second second-medium inlet 128, and a second-medium outlet 129. The first part of the second flow channel 121 includes the part of the second flow channel between the first second-medium inlet 127 and the connecting part 123 or the second-medium outlet 129. The second part of the second flow channel 122 includes the part of the second flow channel between the second second-medium inlet 128 and the connecting part 123 or the second-medium outlet 129. The second medium flowing into the first part of the second flow channel 122 from the first second-medium inlet 127 can flow towards the second-medium outlet 129, and the second medium flowing into the second part of the second flow channel 122 from the second second-medium inlet 128 can also flow towards the second-medium outlet 129. The second medium in the first part of the second flow channel 121 can exchange heat with the first medium in the first flow channel 11. The second medium in the second part of the second flow channel 122 can exchange heat with the third medium in the third flow channel 13.

[0182] Please refer to Figure 14 , which shows a schematic structural diagram of the plate heat exchanger in the embodiments of this specification. As Figure 14 shown, in some embodiments of this specification, the plate heat exchanger may include a first heat exchanger 14 and a second heat exchanger 15. The first heat exchanger 14 may include a first flow channel 11 and a first part of the second flow channel 121 that are isolated from each other. The second heat exchanger 15 may include a second part of the second flow channel 122 and a third flow channel 13 that are isolated from each other. A second-medium inlet 124 and a first second-medium outlet 125 may be provided on the first heat exchanger 14. The first part of the second flow channel 121 is the flow channel between the second-medium inlet 124 and the first second-medium outlet 125. A connecting part 123 and a second second-medium outlet 126 may be provided on the second heat exchanger 15. The second part of the second flow channel 122 is the flow channel between the connecting part 123 and the second second-medium outlet 126. The connecting part 123 may be connected to the first second-medium outlet 125 through a connecting pipe.

[0183] In this embodiment, the plate heat exchanger is composed of two heat exchangers, namely, the first heat exchanger 14 and the second heat exchanger 15. The second medium flowing into the first part of the second flow channel 121 from the second medium inlet 124 of the first heat exchanger 14 can flow to the first second medium outlet 125, and then flow to the connection part 123 and enter the second part of the second flow channel 122. The second medium flowing into the second part of the second flow channel 122 can flow to the second second medium outlet 126. In the above way, the two heat exchangers can be combined to obtain a three-channel plate heat exchanger, and by arranging the two heat exchangers back to back, the volume of the plate heat exchanger can be reduced.

[0184] The embodiment of this specification also provides a heat exchange device. Please refer to Figures 15 to 21 , which shows the structural schematic diagram of the heat exchange device in the embodiment of this specification. As Figures 15 to 21 shown, the heat exchange device may include a plate heat exchanger 10 and a flow regulating device 20. Among them, the plate heat exchanger 10 may be the plate heat exchanger 10 in any of the above embodiments, which will not be elaborated here. The flow regulating device 20 can be used to regulate the flow rate of the second medium flowing in the first part of the second flow channel 121 and / or the second part of the second flow channel 122 of the plate heat exchanger 10.

[0185] In one embodiment, the flow regulating device 20 can be used to regulate the flow rate of the second medium flowing in the first part of the second flow channel 121 of the plate heat exchanger 10. Exemplarily, the flow regulating device 20 can be arranged on the connecting pipe communicating with the outlet of the first part of the second flow channel 121, that is, on the connecting pipe communicating with the first second medium outlet 125 of the second flow channel 12.

[0186] In another embodiment, the flow regulating device 20 can be used to regulate the flow rate of the second medium flowing in the second part of the second flow channel 122 of the plate heat exchanger 10. Exemplarily, the flow regulating device 20 can be arranged on the connecting pipe communicating with the outlet of the second part of the second flow channel 122, that is, on the connecting pipe communicating with the second second medium outlet 126 of the second flow channel 12.

[0187] In yet another embodiment, the flow regulating device 20 can be used to regulate the flow rate of the second medium flowing in the first part of the second flow channel 121 and the second part of the second flow channel 122 of the plate heat exchanger 10. Exemplarily, the flow regulating device 20 can be arranged on the connecting pipe communicating with the second medium inlet 124 and on the connecting pipe communicating with the first second medium outlet 125 or the second second medium outlet 126. Another example is that the flow regulating device 20 can be arranged on the connecting pipe communicating with the first second medium outlet 125 and the connecting pipe communicating with the second second medium outlet 126.

[0188] In the above embodiments, the heat exchange device includes the plate heat exchanger described in any of the foregoing embodiments, which can achieve two types of heat exchange in one heat exchanger, and has a small volume and is convenient for assembly. Further, the heat exchange device is further provided with a flow rate regulating the second medium flowing in the first part of the second flow path and / or the second part of the second flow path, so that the flow rate of the second medium exchanging heat with the first medium in the first flow path and the flow rate of the second medium exchanging heat with the third medium in the third flow path can be adjusted, facilitating heat distribution according to user needs, and better meeting the user's water use needs, heating needs, and / or refrigeration needs.

[0189] As Figures 15 to 21 shown, in some embodiments of the present specification, the heat exchange device may further include a first joint 41. The first joint 41 may include a first interface, a second interface, and a third interface. The first interface of the first joint 41 may be communicated with the second medium inlet 124 or the first second medium outlet 125 through a first connecting pipe, and the second interface of the first joint 41 is communicated with the second second medium outlet 126 through a second connecting pipe. As Figures 15 to 17 , Figure 20 and Figure 21 shown, the first interface of the first joint 41 may be communicated with the second medium inlet 124 through a first connecting pipe, and the second interface of the first joint 41 is communicated with the second second medium outlet 126 through a second connecting pipe. As Figure 18 and Figure 19 shown, the first interface of the first joint 41 may be communicated with the first second medium outlet 125 through a first connecting pipe, and the second interface of the first joint 41 is communicated with the second second medium outlet 126 through a second connecting pipe.

[0190] As Figures 15 to 21 shown, in some embodiments of the present specification, the heat exchange device may further include a circulation pump 30. As Figures 15 to 17 , Figure 20 and Figure 21 shown, the circulation pump 30 can drive the second medium to flow from the second medium inlet 124 of the plate heat exchanger 10 into the first part of the second flow path 121 and then flow to the first second medium outlet 125 and / or the connecting part 123 of the plate heat exchanger 10, and / or, the circulation pump 30 can drive the second medium to flow from the connecting part 123 into the second part of the second flow path 122 of the plate heat exchanger 10 and then flow to the second second medium outlet 126. In this embodiment, by providing the circulation pump 30, the second medium can be driven to flow in the first part of the second flow path 121 and / or the second part of the second flow path 122.

[0191] In some embodiments of the present specification, the circulation pump 30 is disposed on the first connecting pipe and / or the second connecting pipe. As Figures 15 to 17 , Figure 20 and Figure 21As shown, the circulation pump 30 can be arranged on the first connecting pipe. It can be understood that the circulation pump 30 can be arranged on the second connecting pipe. In other embodiments, the circulation pump 30 can also be arranged on the connecting pipe communicating with the third interface of the first joint 41.

[0192] As Figure 15 and Figure 16 As shown, in some embodiments of this specification, the flow regulating device 20 can be arranged on the first connecting pipe and / or the second connecting pipe. By arranging the flow regulating device 20 on the first connecting pipe and / or the second connecting pipe, the flow rate of the second medium flowing in the first part of the second flow channel 121 and / or the second part of the second flow channel 122 communicating therewith can be adjusted.

[0193] As Figure 16 As shown, in some embodiments of this specification, the flow regulating device 20 is a solenoid valve, and the solenoid valve can regulate the flow rate of the second medium flowing in the first connecting pipe and / or the second connecting pipe. In this embodiment, the solenoid valve can not only regulate the on / off of the first connecting pipe and / or the second connecting pipe, but also regulate the opening degree, so that the flow rate of the first connecting pipe and / or the second connecting pipe can be regulated, and further the flow rate of the second medium flowing in the first part of the second flow channel 121 and / or the second part of the second flow channel 122 can be regulated, and the ratio of the flow rate of the second medium flowing in the first part of the second flow channel 121 and the second part of the second flow channel 122 can also be regulated. It can be understood that the flow regulating device 20 can also include being arranged on the connecting pipe communicating with the first outlet 125 of the second medium. For example, the flow regulating device 20 also includes being arranged on the connecting pipe between the first outlet 125 of the second medium and the third interface of the first joint 41.

[0194] As Figures 17 to 21 As shown, in some embodiments of this specification, the flow regulating device 20 is a three-way valve. The first end of the three-way valve is communicated with the second medium inlet 124 or the first outlet 125 of the second medium through the first connecting pipe, and the second end of the three-way valve is communicated with the second outlet 126 of the second medium through the second connecting pipe. The third end of the three-way valve can be used for the second medium to flow in. The three-way valve can regulate the opening degree or on / off of the first end, the second end and the third end, so that the flow rate of the first connecting pipe and / or the second connecting pipe can be regulated, and further the flow rate of the second medium flowing in the first part of the second flow channel 121 and / or the second part of the second flow channel 122 can be regulated, and the ratio of the flow rate of the second medium flowing in the first part of the second flow channel 121 and the second part of the second flow channel 122 can also be regulated.

[0195] As Figure 21As shown, in some embodiments of this specification, the heat exchange device may further include: a second joint 42, a third joint 43, and a fourth joint 44. The first interface of the second joint 42 is communicated with the first outlet 125 of the second medium or the inlet 124 of the second medium through a third communication pipe. The first interface of the third joint 43 is communicated with the third medium inlet 131 of the plate heat exchanger 10 through a fourth communication pipe. The first interface of the fourth joint 44 is communicated with the third medium outlet 132 of the plate heat exchanger 10 through a fifth communication pipe.

[0196] Please refer to Figure 22 and Figure 23 , which respectively show schematic structural diagrams of the heat exchange device in different angles in the embodiments of this specification. As Figure 22 and Figure 23 shown, the heat exchange device may include a first joint 41, a second joint 42, a third joint 43, and a fourth joint 44. The first joint 41 may be a three-way valve. The first end of the first joint 41 is communicated with the second medium inlet 124 of the plate heat exchanger 10, and the second end may be communicated with the second outlet 126 of the second medium of the plate heat exchanger 10. The second joint 42 is communicated with the first outlet 125 of the second medium of the plate heat exchanger 10. The third joint 43 is communicated with the third medium inlet 131 of the plate heat exchanger 10. The fourth joint 44 is communicated with the third medium outlet 132 of the plate heat exchanger 10. In one embodiment, the heat exchange device may be disposed in the housing of the heat source, and the first medium inlet 111 and the first medium outlet 112 of the plate heat exchanger 10 may be respectively communicated with the outlet and the inlet of the heat source through communication pipes.

[0197] It can be understood that in other embodiments of this specification, the second joint 42 may be the first outlet 125 of the second medium or the inlet 124 of the second medium. The third joint 43 is the third medium inlet 131 of the plate heat exchanger 10. The fourth joint 44 is the third medium outlet 132 of the plate heat exchanger 10. That is to say, the first outlet 125 of the second medium or the inlet 124 of the second medium, the third medium inlet 131, and / or the third medium outlet 132 of the plate heat exchanger 10 may directly serve as joints without the third communication pipe, the fourth communication pipe, and / or the fifth communication pipe.

[0198] In the above embodiments, the heat exchange device may be provided with a first joint 41, a second joint 42, a third joint 43, and a fourth joint 44, which facilitates the connection of external devices to the medium inlets and outlets of the second flow channel 12 and the medium inlets and outlets of the third flow channel 13.

[0199] As Figure 21As shown, in some embodiments of this specification, the heat exchange device may further include a housing 40. The housing 40 of the heat exchange device is used to place the plate heat exchanger 10 and the flow regulating device 20. In this embodiment, by arranging the heat exchange device in an independent housing, it can be used in cooperation without improving the external devices connected thereto.

[0200] As Figure 21 shown, in some embodiments of this specification, the heat exchange device may further include: a first joint 41, a second joint 42, a third joint 43, a fourth joint 44, a fifth joint 45, and a sixth joint 46. The first joint 41 may include a first interface, a second interface, and a third interface. The first interface of the first joint 41 is connected to the second medium inlet 124 (as Figure 21 shown) or the first outlet 125 of the second medium through a first connecting pipe, and the second interface of the first joint 41 is connected to the second outlet 126 of the second medium through a second connecting pipe. The first interface of the second joint 42 is connected to the first outlet 125 of the second medium or the second medium inlet 124 through a third connecting pipe. The first interface of the third joint 43 is connected to the third medium inlet 131 of the plate heat exchanger 10 through a fourth connecting pipe. The first interface of the fourth joint 44 is connected to the third medium outlet 132 of the plate heat exchanger 10 through a fifth connecting pipe. The first interface of the fifth joint 45 is connected to the first medium inlet 111 of the first flow channel 11 through a sixth connecting pipe. The first interface of the sixth joint 46 is connected to the first medium outlet 112 of the first flow channel 11 through a seventh connecting pipe. It can be understood that in other embodiments of this specification, the second joint 42 may be the first outlet 125 of the second medium or the second medium inlet 124. The third joint 43 may be the third medium inlet 131 of the plate heat exchanger 10. The fourth joint 44 is the third medium outlet 132 of the plate heat exchanger 10. The fifth joint 45 may be the first medium inlet 111 of the first flow channel 11. The sixth joint 46 may be the first medium outlet 112 of the first flow channel 11. That is to say, the first outlet 125 or the second medium inlet 124, the third medium inlet 131, the third medium outlet 132, the first medium inlet 111, and / or the first medium outlet 112 of the plate heat exchanger 10 may directly serve as joints without the third connecting pipe, the fourth connecting pipe, the fifth connecting pipe, the sixth connecting pipe, and / or the seventh connecting pipe.

[0201] In the above embodiments, by arranging the first joint 41, the second joint 42, the third joint 43, the fourth joint 44, the fifth joint 45, and the sixth joint 46, it is convenient for the external devices to be connected to the medium inlets and outlets of the first flow channel 11, the second flow channel 12, and the third flow channel 13 of the heat exchange device.

[0202] Please continue to refer to Figure 21, in some embodiments of the present specification, six openings are provided on the housing 40 of the heat exchange device. The third interface of the first joint 41, the second interface of the second joint 42, the second interface of the third joint 43, the second interface of the fourth joint 44, the second interface of the fifth joint 45, and the second interface of the sixth joint 46 respectively extend out of the housing 40 from the six openings on the housing 40. By providing six openings on the housing 40, six joints can extend out of the housing 40, facilitating the connection of external devices to the third interface of the first joint 41, the second interface of the second joint 42, the second interface of the third joint 43, the second interface of the fourth joint 44, the second interface of the fifth joint 45, and the second interface of the sixth joint 46 of the heat exchange device.

[0203] Please refer to Figure 24 , which shows a schematic structural diagram of the heat exchange device in the embodiments of the present specification. As Figure 24 shown, the plate heat exchanger in the heat exchange device may be composed of a first heat exchanger 14 and a second heat exchanger 15. The heat exchange device may further include a flow regulating device 20 and a circulation pump 30. As Figure 24 shown, the flow regulating device 20 may be a three-way valve. The first end of the three-way valve is communicated with the second medium inlet 124 through a first connecting pipe. The second end of the three-way valve is communicated with the second outlet 126 of the second medium through a second connecting pipe. The circulation pump 30 may be arranged on the first connecting pipe. In one embodiment, the third end of the three-way valve may be communicated with the first end, the second end or the outlet of the heat source, and the first outlet 125 of the second medium may also be communicated with the inlet of the first end, the second end or the heat source.

[0204] The embodiments of the present specification also provide a heating system. Figures 25 to 32 which shows a schematic structural diagram of the heating system in the embodiments of the present specification. As Figures 25 to 32 shown, the heating system may include a heat exchange device and a heat source 100. In some embodiments of the present specification, the heat source 100 may include at least one of the following: a gas water heating device, an electric water heating device, a solar water heating device, a heat pump device.

[0205] As Figure 25 and Figure 26As shown, in some embodiments of this specification, the outlet of the heat source 100 is communicated with the first medium inlet 111 of the first flow channel 11 of the heat exchange device, and the inlet of the heat source 100 is communicated with the first medium outlet 112 of the first flow channel 11. In this embodiment, the inlet and outlet of the heat source 100 are communicated with the first flow channel 11, and the heat source 100 is used to heat or absorb heat from the first medium. The first medium flowing out of the outlet of the heat source 100 enters the first flow channel 11 of the heat exchange device and then flows back to the inlet of the heat source 100. The first medium flowing from the heat source 100 into the first flow channel 11 can exchange heat with the second medium flowing in the first part of the second flow channel 121. The second medium in the first part of the second flow channel 121 can flow to the first second medium outlet 125 and then flow out from the first second medium outlet 125. The second medium in the first part of the second flow channel 121 that has exchanged heat with the first medium in the first flow channel 11 can also flow to the communication part 123 and then enter the second part of the second flow channel 122 to exchange heat with the third medium in the third flow channel 13. The heat of the first medium flowing out of the heat source 100 can be directly transferred to the second medium in the second flow channel 12, and can also be indirectly transferred to the third medium in the third flow channel 13 through the second medium in the second part of the second flow channel 122. Or, the first medium flowing out of the heat source 100 can directly absorb heat from the second medium in the second flow channel 12, and can also indirectly absorb heat from the third medium in the third flow channel 13 through the second medium in the second part of the second flow channel 122.

[0206] As Figure 27 and Figure 28 shown, the outlet of the heat source 100 is communicated with the second medium inlet 124 of the second flow channel 12 of the heat exchange device, and the inlet of the heat source 100 is communicated with the first second medium outlet 125 and / or the second second medium outlet 126 of the second flow channel 12.

[0207] As Figure 27As shown, the outlet of the heat source 100 is in communication with the second medium inlet 124 of the second flow channel 12, and the inlet of the heat source 100 is in communication with the first outlet 125 of the second medium of the second flow channel 12. In this embodiment, the inlet and outlet of the heat source 100 are in communication with the second flow channel 12. The second medium flowing out of the outlet of the heat source 100 can flow into the first part of the second flow channel 121 from the second medium inlet 124 of the second flow channel 12. The second medium flowing into the first part of the second flow channel 121 can flow out to the inlet of the heat source 100 from the first outlet 125 of the second medium. The second medium flowing into the first part of the second flow channel 121 can also flow to the connecting part 123 and then enter the second part of the second flow channel 122, and then flow back to the second medium inlet 124 from the second outlet 126 of the second medium. In this embodiment, the heat of the second medium flowing out of the heat source 100 can be directly transferred to the first medium in the first flow channel 11 and the third medium in the third flow channel 13. Or rather, the second medium flowing out of the heat source 100 can directly absorb heat from the first medium in the first flow channel 11 and the third medium in the third flow channel 13.

[0208] As Figure 28 As shown, the outlet of the heat source 100 is in communication with the second medium inlet 124 of the second flow channel 12 of the heat exchange device, and the inlet of the heat source 100 is in communication with both the first outlet 125 and the second outlet 126 of the second medium of the second flow channel 12. In this embodiment, the inlet and outlet of the heat source 100 are in communication with the second flow channel 12. The second medium flowing out of the outlet of the heat source 100 can flow to the connecting part 123 from the second medium inlet 124 of the second flow channel 12. The second medium flowing to the connecting part 123 can flow into the first part of the second flow channel 121 and then flow out to the inlet of the heat source 100 from the first outlet 125 of the second medium. The second medium flowing to the connecting part 123 can also flow into the second part of the second flow channel 122 and then flow out to the inlet of the heat source 100 from the second outlet 126 of the second medium. In this embodiment, the heat of the second medium flowing out of the heat source 100 can be directly transferred to the first medium in the first flow channel 11 and the third medium in the third flow channel 13. Or rather, the second medium flowing out of the heat source 100 can directly absorb heat from the first medium in the first flow channel 11 and the third medium in the third flow channel 13.

[0209] In the heating system in the above embodiments, the heating system includes a heat source 100 and the heat exchange device described in any of the foregoing embodiments. The heat source 100 can be connected to the first flow channel 11 or the second flow channel 12 of the heat exchange device. The medium flowing out of the outlet of the heat source 100 can flow into the first flow channel 11 or the second flow channel 12 and then return to the inlet of the heat source 100. Since the first part of the second flow channel 121 is connected to the second part of the second flow channel 122, and the first flow channel 11 exchanges heat with the first part of the second flow channel 121, and the third flow channel 13 exchanges heat with the second part of the second flow channel 122, therefore, the heat of the heat exchange medium flowing from the heat source 100 into the first flow channel 11 or the second flow channel 12 can be directly or indirectly transferred to the heat exchange medium in the second flow channel 12 and the third flow channel 13, or the heat exchange medium in the first flow channel 11 and the third flow channel 13. Or the heat exchange medium flowing from the heat source 100 into the first flow channel 11 or the second flow channel 12 can directly or indirectly absorb heat from the heat exchange medium in the second flow channel 12 and the third flow channel 13, or the heat exchange medium in the first flow channel 11 and the third flow channel 13. Further, by adjusting the flow regulating device 20 in the heat exchange device, the heat distribution can be adjusted, so as to better meet the heating demand, hot water demand and / or cooling demand of users.

[0210] In some embodiments of the present specification, when the outlet of the heat source 100 is connected to the first medium inlet 111 of the first flow channel 11 of the heat exchange device, and the inlet of the heat source 100 is connected to the first medium outlet 112 of the first flow channel 11, the second medium inlet 124 of the second flow channel 12 of the heat exchange device is connected to the outlet of the first end 200, and the second medium first outlet 125 of the second flow channel 12 of the heat exchange device is connected to the inlet of the first end 200. The third medium inlet 131 of the third flow channel 13 of the heat exchange device is connected to the outlet of the second end 300, and the third medium outlet 132 of the third flow channel 13 of the heat exchange device is connected to the inlet of the second end 300.

[0211] As Figure 25 and Figure 26 shown, the inlet and outlet of the heat source 100 are connected to the first flow channel 11. The second flow channel 12 is connected to the first end 200. The second medium inlet 124 of the second flow channel 12 is connected to the outlet of the first end 200. The second medium first outlet 125 of the second flow channel 12 is connected to the inlet of the first end 200. The third flow channel 13 is connected to the second end 300. The third medium inlet 131 of the third flow channel 13 is connected to the outlet of the second end 300, and the third medium outlet 132 of the third flow channel 13 is connected to the outlet of the third end. Through the heating system in this embodiment, the heat source 100 can be used to supply heat or cooling to the first end 200 and / or the second end 300.

[0212] In some embodiments of the present specification, when the outlet of the heat source 100 is communicated with the second medium inlet 124 of the second flow path 12 of the heat exchange device, and the inlet of the heat source 100 is communicated with the first second medium outlet 125 and / or the second second medium outlet 126 of the second flow path 12, the first medium inlet 111 of the first flow path 11 of the heat exchange device is communicated with the outlet of the first end 200, and the first medium outlet 112 of the first flow path 11 of the heat exchange device is communicated with the inlet of the first end 200. The third medium inlet 131 of the third flow path 13 of the heat exchange device is communicated with the outlet of the second end 300, and the third medium outlet 132 of the third flow path 13 of the heat exchange device is communicated with the inlet of the second end 300.

[0213] As Figure 27 and Figure 28 shown, the inlet and outlet of the heat source 100 are communicated with the second flow path 12. The first flow path 11 is communicated with the first end 200. The first medium inlet 111 of the first flow path 11 is communicated with the outlet of the first end 200. The first medium outlet 112 of the first flow path 11 is communicated with the inlet of the first end 200. The third flow path 13 is communicated with the second end 300. The third medium inlet 131 of the third flow path 13 is communicated with the outlet of the second end 300, and the third medium outlet 132 of the third medium is communicated with the inlet of the second end 300. Through the heating system in this embodiment, the heat source 100 can be used to supply heat or cold to the first end 200 and / or the second end 300.

[0214] In some embodiments of the present specification, the first end 200 and / or the second end 300 is a domestic hot water end or a heating end.

[0215] Specifically, in one embodiment, both the first end 200 and the second end 300 are domestic hot water ends. The domestic hot water end can provide domestic hot water for users. In another embodiment, both the first end 200 and the second end 300 are heating ends. Among them, the heating end can include various heating devices, such as radiators, towel racks, etc. In yet another embodiment, the first end 200 is a domestic hot water end and the second end 300 is a heating end. In still another embodiment, the first end 200 is a heating end and the second end 300 is a domestic water end.

[0216] In some embodiments of the present specification, the heat source 100 may include at least one of the following: a gas water heater, an electric water heater, a solar water heater, a heat pump device. The first end 200 is a heating end and the second end 300 is a domestic water end, or the first end 200 is a domestic water end and the second end 300 is a heating end.

[0217] Please refer to Figure 33, showing a schematic structural diagram of the heating system in the embodiments of the present specification. In some embodiments of the present specification, such as Figure 33 As shown, the end of domestic water is a water tank, and the water tank may include a cold water inlet 301, a hot water outlet 302, a cold water outlet 303, and a hot water inlet 304. The cold water outlet 303 of the water tank is communicated with the third medium inlet 131 of the third flow channel 13, the hot water inlet 304 of the water tank is communicated with the third medium outlet 132 of the third flow channel 13, and the cold water inlet 301 is communicated with the water source 500. The hot water outlet 302 of the water tank is used to provide hot water for users.

[0218] Such as Figure 29 As shown, in some embodiments of the present specification, the heat exchange device may be disposed in the housing 400 of the heat source 100. The outlet and inlet of the heat source 100 are respectively communicated with the first medium inlet 111 and the first medium outlet 112 of the first flow channel 11 of the heat exchange device through a communication pipe in the housing 400 of the heat source 100.

[0219] Such as Figure 29 As shown, in some embodiments of the present specification, the heat exchange device is disposed in the housing 400 of the heat source 100. The housing 400 of the heat source 100 may include at least four openings, and the four openings are respectively used for the third opening of the first joint 41 of the heat exchange device, the second opening of the second joint 42, the second opening of the third joint 43, and the second opening of the fourth joint 44 to extend out of the housing 400 of the heat source 100.

[0220] Such as Figure 31 As shown, in some embodiments of the present specification, the heat exchange device may be disposed in the housing 400 of the heat source 100. The outlet and inlet of the heat source 100 are respectively communicated with the second medium inlet 124 and the second medium first outlet 125 and / or the second medium second outlet 126 of the second flow channel 12 of the heat exchange device through a communication pipe in the housing 400 of the heat source 100.

[0221] Such as Figure 31 As shown, in some embodiments of the present specification, the heat exchange device is disposed in the housing 400 of the heat source 100. The housing 400 of the heat source 100 may include at least four openings, and the four openings are respectively used for the second opening of the third joint 43 of the heat exchange device, the second opening of the fourth joint 44, the second opening of the fifth joint 45, and the second opening of the sixth joint 46 to extend out of the housing 400 of the heat source 100.

[0222] In the above embodiments, by disposing the heat exchange device in the housing 400 of the heat source 100, the heating system can be made more integrated, facilitating the installation of the heating system.

[0223] Such as Figure 30As shown, in some embodiments of this specification, the heat exchange device is disposed outside the housing 400 of the heat source 100. The outlet and inlet of the heat source 100 are respectively communicated with the first medium inlet 111 and the first medium outlet 112 of the first flow channel 11 of the heat exchange device through a communication pipe outside the housing 400 of the heat source 100.

[0224] As Figure 32 As shown, in some embodiments of this specification, the heat exchange device is disposed outside the housing 400 of the heat source 100. The outlet and inlet of the heat source 100 are respectively communicated with the second medium inlet 124, the first second medium outlet 125 and / or the second second medium outlet 126 of the second flow channel 12 of the heat exchange device through a communication pipe outside the housing 400 of the heat source 100.

[0225] In the above embodiments, by disposing the heat exchange device outside the housing 400 of the heat source 100, the function of the heating system can be realized without changing the structure of the heat source 100.

[0226] It can be understood that when the inlet and outlet of the heat source 100 are communicated with the second flow channel 12, if the heat source 100 is a heat pump device, a circulation pump 30 does not need to be provided in the heat exchange device to realize the circulation of the second medium in the first part of the second flow channel 121 and the second part of the second flow channel 122. For example, when the heat pump device is an air conditioner, the compressor 1001 in the air conditioner can drive the refrigerant to circulate in the first part of the second flow channel 121 and the second part of the second flow channel 122.

[0227] In addition, when the heat source 100 is a gas water heating device or an electric water heating device, it is preferable to provide a circulation pump 30 in the main path communicated with the inlet or outlet of the heat source 100 rather than in the heat exchange device. Preferably, the circulation pump 30 is provided on the main path communicated with the outlet of the heat source 100.

[0228] As Figure 33 As shown, in some embodiments of this specification, the heat source 100 is an air conditioner device. The heat source 100 may include a compressor 1001, an expansion valve 1002, an evaporator and a condenser 1003, and a reversing valve 1004. The second terminal 300 is a water tank. The water tank includes a cold water inlet 301, a hot water outlet 302, a cold water outlet 303 and a hot water inlet 304. The cold water inlet 301 is communicated with a water source 500. The hot water outlet 302 is used to provide hot water for users. The cold water outlet 303 is communicated with the third medium inlet 131 of the third flow channel 13. The hot water inlet 304 is communicated with the third medium outlet 132 of the third flow channel 13. The second medium inlet 124 is communicated with the outlet of the first terminal 200 through the third interface of the first joint 41, and the first second medium outlet 125 is communicated with the inlet of the first terminal 200. The first terminal 200 may be a heating terminal.

[0229] Regarding the heating system described in any of the above embodiments, the following heating system control method can be adopted for control. Specifically, the heating system control method may include the following steps: controlling the flow regulating device to regulate the flow rate of the second medium flowing in the first part of the second flow path and / or the second part of the second flow path.

[0230] The method in this embodiment can be applied to the heating system described in any of the above embodiments, for example, it can be applied to the controller in the heating system. The controller can be communicatively connected to the flow regulating device. The controller can be arranged in the heat exchange device or in the heat source.

[0231] The controller can control the flow regulating device to regulate the flow rate of the second medium flowing in the first part of the second flow path and / or the second part of the second flow path. In one embodiment, the second medium can be controlled to flow in the first part of the second flow path and the second medium can be controlled not to flow in the second part of the second flow path. In another embodiment, the second medium can be controlled to flow in the first part of the second flow path and the second medium can be controlled to flow in the second part of the second flow path. In yet another embodiment, the second medium can be controlled not to flow in the first part of the second flow path and the second medium can be controlled to flow in the second part of the second flow path. In another embodiment, the second medium can be controlled not to flow in the first part of the second flow path and the second medium can be controlled not to flow in the second part of the second flow path.

[0232] Of course, the flow regulating device can also be controlled to regulate the flow rate of the second medium flowing in the first part of the second flow path and / or the second part of the second flow path. In one embodiment, the flow rate of the second medium in the first part of the second flow path can be controlled to increase and the flow rate of the second medium in the second part of the second flow path can be controlled to decrease. In another embodiment, the flow rate of the second medium in the first part of the second flow path can be controlled to increase and the flow rate of the second medium in the second part of the second flow path can be controlled to increase. In yet another embodiment, the flow rate of the second medium in the first part of the second flow path can be controlled to decrease and the flow rate of the second medium in the second part of the second flow path can be controlled to increase. In another embodiment, the flow rate of the second medium in the first part of the second flow path can be controlled to decrease and the flow rate of the second medium in the second part of the second flow path can be controlled to decrease.

[0233] In the above embodiments, by controlling the flow regulating device in the heat exchange device to regulate the flow rate of the second medium flowing in the first part of the second flow path and / or the second part of the second flow path, the heat distribution of the heat source can be adjusted, so as to better meet the heating demand, hot water demand and / or cooling demand of users.

[0234] In some embodiments of the present specification, controlling the flow rate regulating device to regulate the flow rate of the second medium flowing in the first part of the second flow path and / or the second part of the second flow path may include: according to the current working state of the heating system, controlling the flow rate regulating device to regulate the flow rate of the second medium flowing in the first part of the second flow path and / or the second part of the second flow path.

[0235] In this embodiment, according to the current working state of the heating system, the flow rate regulating device can be controlled to regulate the flow rate of the second medium flowing in the first part of the second flow path and / or the second part of the second flow path. In an exemplary embodiment, the current working state may include: a first working state, a second working state, and a third working state. The first working state may include a heating state and a cooling state. In the cooling state, the low-temperature refrigerant provided by the heat source exchanges heat with the medium flowing into the heat exchange device at the first end or the second end to perform cooling. In the heating state, the high-temperature refrigerant provided by the heat source exchanges heat with the medium flowing into the heat exchange device at the first end or the second end to perform heating. In the second working state, the high-temperature refrigerant provided by the heat source and / or the medium flowing out of the heating end directly or indirectly exchange heat with the medium flowing into the heat exchange device at the domestic hot water end to heat the domestic water. In the third working state, the high-temperature refrigerant provided by the heat source directly or indirectly exchanges heat with the medium flowing into the heat exchange device at the heating end and the medium flowing into the heat exchange device at the domestic hot water end to perform heating and provide domestic hot water. The controller can control the flow rate regulating device to regulate the flow rate of the second medium flowing in the first part of the second flow path and / or the second part of the second flow path according to the current working state of the heating system to meet the user's heating demand, cooling demand, and / or domestic hot water demand.

[0236] In some embodiments of the present specification, the flow rate regulating device is a three-way valve; the first end of the three-way valve is communicated with the second medium inlet through a first communication pipe, and the second end of the three-way valve is communicated with the second outlet of the second medium through a second communication pipe. Correspondingly, according to the current working state of the heating system, controlling the flow rate regulating device to regulate the flow rate of the second medium flowing in the first part of the second flow path and / or the second part of the second flow path may include: when the current working state of the heating system is the first working state, controlling the flow rate regulating device to conduct the first end and the second end of the three-way valve and disconnect the third end of the three-way valve, so that all the second medium flowing into the first part of the second flow path from the second medium inlet flows into the second part of the second flow path from the communication part and then flows from the second outlet of the second medium to the second medium inlet.

[0237] In this embodiment, the flow regulating device is a three-way valve. The first end of the three-way valve is communicated with the second inlet through a first connecting pipe, and the second end of the three-way valve is communicated with the second outlet of the second medium through a second connecting pipe. When the current working state of the heating system is the first working state, the flow regulating device can be controlled to conduct the first end and the second end and disconnect the third end of the three-way valve, so that all the second medium flowing into the first part of the second flow path from the second medium inlet flows from the communicating part into the second part of the second flow path and then flows from the second outlet of the second medium to the second medium inlet. That is to say, when the heating system is in the first working state, the second medium circulates in the first part of the second flow path and the second part of the second flow path.

[0238] Exemplarily, when the first flow path is communicated with the inlet and outlet of the heat source, the second flow path is communicated with the inlet and outlet of the heating end, and the third flow path is communicated with the inlet and outlet of the domestic water end, in the first working state, the first end and the second end of the three-way valve can be controlled to conduct and the third end of the three-way valve can be controlled to disconnect. At this time, all the second medium flowing into the first part of the second flow path from the second medium inlet flows from the communicating part into the second part of the second flow path and then flows from the second outlet of the second medium to the second medium inlet. In this case, the heating water flowing into the second flow path exchanges heat with the heat source and then heats the domestic water instead of flowing to the heating end. In this case, the first working state can be the domestic hot water mode.

[0239] In some embodiments of the present specification, according to the current working state of the heating system, controlling the flow regulating device to adjust the flow rate of the second medium flowing in the first part of the second flow path and / or the second part of the second flow path may include: when the current working state of the heating system is the second working state, controlling the flow regulating device to conduct the first end and the third end of the three-way valve and disconnect the second end of the three-way valve, so that all the second medium flowing into the first part of the second flow path from the second medium inlet flows out from the first outlet of the second medium.

[0240] In this embodiment, the heating system may further include a second working state. In the second working state, the flow regulating device is controlled to conduct the first end and the third end of the three-way valve and disconnect the second end, so that all the second medium flowing into the first part of the second flow path from the second medium inlet flows to the first outlet of the second medium. That is to say, when the heating system is in the second working state, the second medium only circulates in the first part of the second flow path.

[0241] Exemplarily, when the first flow channel is connected to the inlet and outlet of the heat source, the second flow channel is connected to the inlet and outlet of the heating terminal, and the third flow channel is connected to the inlet and outlet of the domestic water terminal, in the second working state, the first end and the third end of the three-way valve can be controlled to conduct and the second end of the three-way valve can be controlled to disconnect. At this time, all the second medium flowing into the second medium inlet from the heating terminal flows into the first part of the second flow channel and then flows out from the first second medium outlet. In this case, heat exchange occurs between the heating water at the heating terminal and the first medium flowing into the first flow channel from the heat source. In this case, it can be a heating mode or a cooling mode.

[0242] In some embodiments of the present specification, according to the current working state of the heating system, controlling the flow regulating device to regulate the flow rate of the second medium flowing in the first part of the second flow channel and / or the second part of the second flow channel may include: when the current working state of the heating system is the third working state, controlling the flow regulating device to conduct the first end, the second end, and the third end of the three-way valve, so that a part of the second medium flowing into the first part of the second flow channel from the second medium inlet flows out from the first second medium outlet, and the other part flows into the second part of the second flow channel from the communicating part and then flows from the second second medium outlet to the second medium inlet.

[0243] In this embodiment, the heating system may further include a third working state. In the third working state, the flow regulating device is controlled to conduct the first end, the second end, and the third end of the three-way valve, so that a part of the second medium flowing into the first part of the second flow channel from the second medium inlet flows out from the first second medium outlet, and a part flows into the second part of the second flow channel via the communicating part and then flows to the second second medium outlet. That is to say, when the heating system is in the third working state, the second medium circulates in the first part of the second flow channel and the second part of the flow channel.

[0244] Exemplarily, when the first flow channel is connected to the inlet and outlet of the heat source, the second flow channel is connected to the inlet and outlet of the heating terminal, and the third flow channel is connected to the inlet and outlet of the domestic water terminal, in the third working state, the first end, the second end, and the third end of the three-way valve can be controlled to conduct. At this time, the second medium flowing into the second medium inlet from the heating terminal flows into the first part of the second flow channel, and then part of it flows to the first second medium outlet, and part of it flows into the second part of the second flow channel via the communicating part and then flows to the second second medium outlet. In this case, heat exchange occurs between the heating water at the heating terminal and the first medium flowing into the first flow channel from the heat source, and heat exchange can also occur with the domestic water in the third flow channel. It can be a heating mode plus a domestic hot water mode.

[0245] In some embodiments of the present specification, the outlet of the heat source is communicated with the first medium inlet of the first flow channel of the heat exchange device, the inlet of the heat source is communicated with the first medium outlet of the first flow channel, the second medium inlet of the second flow channel of the heat exchange device is communicated with the outlet of the first terminal, the first second medium outlet of the second flow channel of the heat exchange device is communicated with the inlet of the first terminal, the third medium inlet of the third flow channel of the heat exchange device is communicated with the outlet of the second terminal, and the third medium outlet of the third flow channel of the heat exchange device is communicated with the inlet of the second terminal; the third end of the three-way valve is communicated with the outlet of the first terminal; the first terminal is a heating terminal; the second terminal is a domestic water terminal; correspondingly, after controlling the flow regulating device to conduct the first end, the second end and the third end of the three-way valve, it may further include: when the current required load at the domestic water terminal increases, reducing the opening degree of the third end of the three-way valve and / or increasing the opening degree of the second end of the three-way valve.

[0246] In this embodiment, the first flow channel is communicated with the inlet and outlet of the heat source, the second flow channel is communicated with the inlet and outlet of the first terminal, and the third flow channel is communicated with the inlet and outlet of the second terminal. The first terminal is a heating terminal, and the second terminal is a domestic water terminal. The first end of the three-way valve is communicated with the second medium inlet, the second end of the three-way valve is communicated with the second second medium outlet, and the third end of the three-way valve is communicated with the outlet of the first terminal. The first second medium outlet of the second flow channel is communicated with the inlet of the first terminal. When the heating system is in the third working state, the flow regulating device can be controlled to conduct the first end, the second end and the third end of the three-way valve. After that, when the current required load at the domestic water terminal increases, the opening degree of the third end of the three-way valve can be reduced and / or the opening degree of the second end of the three-way valve can be increased, so that the heating water flowing into the second part of the second flow channel increases, and / or the heating water flowing back to the heating terminal decreases, so as to preferentially meet the domestic hot water demand.

[0247] In some embodiments of the present specification, the third end of the three-way valve is communicated with the outlet of the heat source; the inlet of the heat source is communicated with the first outlet of the second medium of the second flow path, the inlet of the first medium of the first flow path of the heat exchange device is communicated with the outlet of the first end, and the outlet of the first medium of the first flow path of the heat exchange device is communicated with the inlet of the first end; the inlet of the third medium of the third flow path of the heat exchange device is communicated with the outlet of the second end, and the outlet of the third medium of the third flow path of the heat exchange device is communicated with the inlet of the second end; correspondingly, after controlling the flow regulating device to conduct the first end, the second end and the third end of the three-way valve, it may further include: when the current required load at the domestic water end increases, if the first end is the domestic water end and the second end is the heating end, increasing the opening degree of the first end of the three-way valve and / or reducing the opening degree of the second end of the three-way valve; when the current required load at the domestic water end increases, if the first end is the heating end and the second end is the domestic water end, increasing the opening degree of the second end of the three-way valve and / or reducing the opening degree of the first end of the three-way valve.

[0248] In this embodiment, the inlet and outlet of the heat source are communicated with the second flow path. The first flow path is communicated with the inlet and outlet of the first end. The second flow path is communicated with the inlet and outlet of the second end. The first end of the three-way valve is communicated with the second medium inlet, the second end of the three-way valve is communicated with the second outlet of the second medium, and the third end of the three-way valve is communicated with the outlet of the heat source. The first outlet of the second medium is communicated with the inlet of the heat source. When the heating system is in the third working state, the flow regulating device can be controlled to conduct the first end, the second end and the third end of the three-way valve. After that, when the current required load at the domestic water end increases, if the first end is the heating end and the second end is the domestic water end, increasing the opening degree of the second end of the three-way valve and / or reducing the opening degree of the first end of the three-way valve, so that most of the second medium in the second medium flowing into the first part of the second flow path enters the second part of the second flow path through the communicating part to heat the domestic water flowing into the third flow path at the domestic water end, so as to preferentially meet the demand for domestic hot water. When the current required load at the domestic water end increases, if the first end is the domestic water end and the second end is the heating end, increasing the opening degree of the first end of the three-way valve and / or reducing the opening degree of the second end of the three-way valve, so that only a small part of the second medium in the second medium flowing into the first part of the second flow path flows into the second part of the second flow path for heating, so that the demand for domestic hot water can be preferentially met. It can be understood that when the current required load at the domestic hot water end increases, the opening degree of the third end of the three-way valve can also be increased to increase the flow rate of the second medium flowing from the heat source outlet into the second flow path, so as to provide more heat to the domestic hot water end. By the above method, the demand for domestic hot water of users can be preferentially met.

[0249] It is understandable that many embodiments of the heat exchange device and the heat supply system have been described above. Correspondingly, the heat supply system control method can be adaptively adjusted in combination with the embodiments of the heat supply system.

[0250] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. Specifically, reference can be made to the description of the relevant embodiments of the foregoing related processing, and details will not be repeated here.

[0251] The above describes specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve the desired result. Additionally, the processes depicted in the drawings do not necessarily require the specific order or sequential order shown to achieve the desired result. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0252] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and many applications other than the provided examples will be apparent to those skilled in the art. Therefore, the scope of this specification should not be determined by the above description, but should be determined by the foregoing claims and the full scope of the equivalents of these claims.

[0253] The above are only the preferred embodiments of this specification and are not used to limit this specification. For those skilled in the art, various changes and modifications can be made to the embodiments of this specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this specification shall be included within the protection scope of this specification.

Claims

1. A plate heat exchanger, characterized in that: The plate heat exchanger comprises a first flow channel, a second flow channel and a third flow channel which are isolated from each other; The first flow channel is used for circulating a first medium; The second flow channel is used to circulate a second medium; the second flow channel has a second medium inlet, a second medium first outlet, and a second medium second outlet; the second flow channel includes a first portion of the second flow channel, a second portion of the second flow channel, and a connecting portion; the connecting portion is used to connect the first portion of the second flow channel with the second portion of the second flow channel; the first portion of the second flow channel includes a portion of the second flow channel between the second medium inlet and the connecting portion or the second medium first outlet; the second portion of the second flow channel includes a portion of the second flow channel between the connecting portion and the second medium second outlet; The second medium flowing from the second medium inlet into the second flow channel of the first part can flow to the second medium first outlet and / or the connecting portion; the second medium flowing from the connecting portion into the second flow channel of the second part can flow to the second medium second outlet; The third flow channel is used for circulating a third medium; The second medium flowing in the second flow channel of the first part can exchange heat with the first medium flowing in the first flow channel, and the second medium flowing in the second flow channel of the second part can exchange heat with the third medium flowing in the third flow channel.

2. The plate heat exchanger according to claim 1, characterized in that: The plate heat exchanger includes at least a first plate, a second plate, a third plate, a fourth plate and a fifth plate; the first plate is arranged adjacent to the second plate; the second plate is arranged adjacent to the third plate, the third plate is arranged adjacent to the fourth plate; the fourth plate is arranged adjacent to the fifth plate; the first plate is sealed and connected to the second plate to form a first cavity between the first plate and the second plate; the second plate and the third plate are sealed and connected to form a second cavity between the second plate and the third plate; the third plate and the fourth plate are sealed and connected to form a third cavity between the third plate and the fourth plate; the fourth plate and the fifth plate are sealed and connected to form a fourth cavity between the fourth plate and the fifth plate.

3. The plate heat exchanger according to claim 2, characterized in that: The first cavity forms part of the first flow channel; the second cavity forms part of the second flow channel in the first part; the third cavity forms part of the second flow channel in the second part; the fourth cavity forms part of the third flow channel; The first medium flowing in the first cavity can exchange heat with the second medium flowing in the second cavity, and the second medium flowing in the third cavity can exchange heat with the third medium flowing in the fourth cavity.

4. The plate heat exchanger according to claim 1, characterized in that: The plate heat exchanger includes at least a first plate, a second plate, a third plate, a fourth plate, a fifth plate and a sixth plate; the first plate is arranged adjacent to the second plate; the second plate is arranged adjacent to the third plate, and the third plate is arranged adjacent to the fourth plate; the fourth plate is arranged adjacent to the fifth plate; the fifth plate is arranged adjacent to the sixth plate; the first plate is sealed and connected to the second plate to form a first cavity between the first plate and the second plate; the second plate and the third plate are sealed and connected to form a second cavity between the second plate and the third plate; the third plate and the fourth plate are sealed and connected to form a third cavity between the third plate and the fourth plate; the fourth plate and the fifth plate are sealed and connected to form a fourth cavity between the fourth plate and the fifth plate; the fifth plate and the sixth plate are sealed and connected to form a fifth cavity between the fifth plate and the sixth plate.

5. The plate heat exchanger according to claim 4, characterized in that: The first cavity forms part of the first flow channel; the second cavity forms part of the second flow channel in the first part; the fourth cavity forms part of the second flow channel in the second part; the fifth cavity forms part of the third flow channel; The communication portion is disposed in the third cavity, and the second cavity is connected to the fourth cavity through the communication portion; The first medium flowing in the first cavity can exchange heat with the second medium flowing in the second cavity, and the second medium flowing in the fourth cavity can exchange heat with the third medium flowing in the fifth cavity.

6. The plate heat exchanger according to claim 1, characterized in that: The plate heat exchanger at least includes a first plate, a second plate, a third plate, a fourth plate, a fifth plate, a sixth plate and a seventh plate; the first plate is arranged adjacent to the second plate; the second plate is arranged adjacent to the third plate, the third plate is arranged adjacent to the fourth plate; the fourth plate is arranged adjacent to the fifth plate; the fifth plate is arranged adjacent to the sixth plate; the sixth plate is arranged adjacent to the seventh plate; the first plate is sealed and connected to the second plate to form a first cavity between the first plate and the second plate; the second plate is sealed and connected to the third plate to form a second cavity between the second plate and the third plate; the third plate is sealed and connected to the fourth plate to form a third cavity between the third plate and the fourth plate; the fourth plate is sealed and connected to the fifth plate to form a fourth cavity between the fourth plate and the fifth plate; the fifth plate is sealed and connected to the sixth plate to form a fifth cavity between the fifth plate and the sixth plate; The sixth plate and the seventh plate are sealed and connected to form a sixth cavity between the sixth plate and the seventh plate.

7. The plate heat exchanger according to claim 6, characterized in that: The first cavity forms part of the first flow channel; the second cavity forms part of the second flow channel of the first part; the fifth cavity forms part of the second flow channel of the second part; The sixth cavity forms part of the third flow channel; The communication portion is disposed in the third cavity and the fourth cavity, and the second cavity is communicated with the fifth cavity through the communication portion; The first medium flowing in the first cavity can exchange heat with the second medium flowing in the second cavity, and the second medium flowing in the fifth cavity can exchange heat with the third medium flowing in the sixth cavity.

8. The plate heat exchanger according to claim 6, characterized in that: The plate heat exchanger also includes a plurality of heat exchange plates; The plurality of heat exchange plates are arranged on a side of the first plate away from the second plate along the stacking direction to form at least one seventh cavity and at least one eighth cavity arranged alternately, the seventh cavity is connected with the first cavity to form part of the first flow channel, the eighth cavity is connected with the second cavity to form part of the first and part of the second flow channel, and the first plate and the closest heat exchange plate form the seventh cavity or the eighth cavity; and / or, The multiple heat exchange plates are arranged on a side of the seventh plate away from the sixth plate along the stacking direction to form at least one ninth cavity and at least one tenth cavity that are staggered. The tenth cavity is connected with the fifth cavity to form part of the second and second flow channels, and the ninth cavity is connected with the sixth cavity to form part of the third flow channel. The seventh plate and the closest heat exchange plate form the ninth cavity or the tenth cavity.

9. The plate heat exchanger according to claim 8, characterized in that: The first cavity is adjacent to the eighth cavity, the first medium flowing in the first cavity can exchange heat with the second medium flowing in the eighth cavity, and the first medium flowing in the seventh cavity can exchange heat with the second medium flowing in the eighth cavity; And / or, the sixth cavity is adjacent to the tenth cavity, the second medium flowing in the tenth cavity can exchange heat with the third medium flowing in the sixth cavity, and the third medium flowing in the ninth cavity can exchange heat with the second medium flowing in the tenth cavity.

10. The plate heat exchanger according to claim 7, characterized in that: At least part of the second medium located on the side of the third plate away from the fourth plate can be collected at the inlet of the connecting portion and flow into the fifth chamber below the fifth plate through the connecting portion.

11. The plate heat exchanger according to claim 9, characterized in that: The flow direction of the first medium flowing in the first chamber and the seventh chamber is opposite to the flow direction of the second medium flowing in the second chamber and the eighth chamber; the flow direction of the second medium flowing in the fifth chamber and the tenth chamber is opposite to the flow direction of the third medium flowing in the sixth chamber and the ninth chamber.

12. The plate heat exchanger according to claim 11, characterized in that: The flow direction of the second medium flowing in the second chamber and the eighth chamber is opposite to the flow direction of the second medium flowing in the fifth chamber and the tenth chamber; or, The flow direction of the second medium flowing in the second chamber and the eighth chamber is the same as the flow direction of the second medium flowing in the fifth chamber and the tenth chamber.

13. The plate heat exchanger according to claim 8, characterized in that: The heat exchange plates at the end of the plate heat exchanger in the stacking direction are provided with a first medium inlet, a first medium outlet, a second medium inlet and a second medium first outlet; the heat exchange plates at the other end of the plate heat exchanger are provided with a second medium second outlet, a third medium inlet and a third medium outlet.

14. The plate heat exchanger according to claim 13, characterized in that: There is at least a partial overlap between the projection of the second medium inlet in the stacking direction and the projection of the second medium second outlet in the stacking direction; There is at least a partial overlap between the projection of the first outlet of the second medium in the stacking direction and the projection of the connecting portion in the stacking direction; There is at least a partial overlap between the projection of the first medium inlet in the stacking direction and the projection of the third medium outlet in the stacking direction; There is at least a partial overlap between the projection of the first medium outlet in the stacking direction and the projection of the third medium inlet in the stacking direction; or, There is at least a partial overlap between a projection of the first outlet of the second medium in the stacking direction and a projection of the second outlet of the second medium in the stacking direction; There is at least a partial overlap between the projection of the second medium inlet in the stacking direction and the projection of the connecting portion in the stacking direction; There is at least a partial overlap between the projection of the first medium inlet in the stacking direction and the projection of the third medium outlet in the stacking direction; There is at least a partial overlap between a projection of the first medium outlet in the stacking direction and a projection of the third medium inlet in the stacking direction.

15. The plate heat exchanger according to claim 13, characterized in that: The first plate, the seventh plate and part of the plurality of heat exchange plates are each provided with four openings, the second plate and the sixth plate are each provided with two openings, the third plate, the fourth plate and the fifth plate are each provided with only one opening, and the openings on the third plate, the fourth plate and the fifth plate form the connecting portion; All the heat exchange plates arranged on the one side of the first plate along the stacking direction and the four openings on the first plate are respectively used to connect the first medium inlet, the first medium outlet, the second medium inlet and the second medium first outlet; The four openings on the part of the heat exchange plate and the seventh plate arranged on the one side of the seventh plate in the stacking direction are respectively used to connect the third medium inlet, the third medium outlet, the second medium second outlet and the connecting portion; The two openings on the second plate are used to connect the second medium inlet and the second medium first outlet respectively; The two openings on the sixth plate are used to connect the communication portion and the second outlet of the second medium respectively.

16. The plate heat exchanger according to claim 8, characterized in that: The heat exchange plates at the end of the plate heat exchanger in the stacking direction are provided with a first medium inlet, a first medium outlet, and a second medium inlet; the heat exchange plates at the other end of the plate heat exchanger are provided with a second medium first outlet, a second medium second outlet, a third medium inlet, and a third medium outlet.

17. The plate heat exchanger according to claim 16, characterized in that: There is at least a partial overlap between the projection of the second medium inlet in the stacking direction and the projection of the second medium second outlet in the stacking direction; There is at least a partial overlap between the projection of the first outlet of the second medium in the stacking direction and the projection of the connecting portion in the stacking direction; There is at least a partial overlap between the projection of the first medium inlet in the stacking direction and the projection of the third medium outlet in the stacking direction; There is at least a partial overlap between a projection of the first medium outlet in the stacking direction and a projection of the third medium inlet in the stacking direction.

18. The plate heat exchanger according to claim 16, characterized in that: The first plate, the seventh plate and part of the plurality of heat exchange plates are each provided with four openings, the second plate and the sixth plate are each provided with two openings, the third plate, the fourth plate and the fifth plate are each provided with only one opening, and the openings on the third plate, the fourth plate and the fifth plate form the connecting portion; The part of the heat exchange plate arranged on the one side of the first plate along the stacking direction and the four openings on the first plate are respectively used to connect the first medium inlet, the first medium outlet, the second medium inlet and the connecting portion; The four openings on all the heat exchange plates and the seventh plate arranged on the one side of the seventh plate along the stacking direction are respectively used to connect the third medium inlet, the third medium outlet, the second medium first outlet and the second medium second outlet; The two openings on the second plate are respectively used to connect the second medium inlet and the connecting portion; the two openings on the sixth plate are respectively used to connect the second medium first outlet and the second medium second outlet.

19. The plate heat exchanger according to claim 1, characterized in that: The plate heat exchanger comprises a first heat exchanger and a second heat exchanger; The first heat exchanger includes the first flow channel and the first portion of the second flow channel which are isolated from each other; The second heat exchanger comprises the second portion second flow channel and the third flow channel which are isolated from each other; The first heat exchanger is provided with a second medium inlet and a second medium first outlet; the first part second flow channel is a flow channel between the second medium inlet and the second medium first outlet; The second heat exchanger is provided with the connecting portion and the second outlet of the second medium; the second flow channel of the second part is the flow channel between the connecting portion and the second outlet of the second medium; The communication portion is in communication with the first outlet of the second medium.

20. A heat exchange device, characterized in that: include: The plate heat exchanger according to any one of claims 1 to 19; A flow regulating device is used to regulate the flow of the second medium flowing in the first part of the second flow channel and / or the second part of the second flow channel of the plate heat exchanger.

21. The heat exchange device according to claim 20, characterized in that: Also includes: The first joint includes a first interface, a second interface and a third interface; the first interface of the first joint is connected to the second medium inlet or the second medium first outlet through a first connecting pipe, and the second interface of the first joint is connected to the second medium second outlet through a second connecting pipe.

22. The heat exchange device according to claim 21, characterized in that: Also includes: A circulation pump, wherein the circulation pump can drive the second medium to flow from the second medium inlet of the plate heat exchanger into the second flow channel of the first part and then flow to the second medium first outlet and / or the connecting part of the plate heat exchanger, and / or the circulation pump can drive the second medium to flow from the connecting part into the second flow channel of the second part of the plate heat exchanger and then flow to the second medium second outlet.

23. The heat exchange device according to claim 22, characterized in that: The circulation pump is arranged on the first connecting pipe and / or the second connecting pipe.

24. The heat exchange device according to claim 22, characterized in that: The flow regulating device is arranged on the first connecting pipe and / or the second connecting pipe.

25. The heat exchange device according to claim 24, characterized in that: The flow regulating device is a solenoid valve, and the solenoid valve can regulate the flow of the second medium flowing in the first connecting pipe and / or the second connecting pipe.

26. The heat exchange device according to claim 20, characterized in that: The flow regulating device is a three-way valve; The first end of the three-way valve is communicated with the second medium inlet or the second medium first outlet through a first communicating pipe, and the second end of the three-way valve is communicated with the second medium second outlet through a second communicating pipe.

27. The heat exchange device according to claim 22, characterized in that: Also includes: A second joint, wherein a first interface of the second joint is connected to the first outlet of the second medium or the inlet of the second medium through a third connecting pipe; A third joint, wherein a first interface of the third joint is connected to a three-medium inlet of the plate heat exchanger through a fourth connecting pipe; A fourth joint, wherein a first interface of the fourth joint is connected to a third medium outlet of the plate heat exchanger through a fifth connecting pipe.

28. The heat exchange device according to claim 20, characterized in that: Also includes: A shell is used to place the plate heat exchanger and the flow regulating device.

29. The heat exchange device according to claim 28, characterized in that: Also includes: A first joint, the first joint comprising a first interface, a second interface and a third interface; the first interface of the first joint is connected to the second medium inlet or the second medium first outlet through a first connecting pipe, and the second interface of the first joint is connected to the second medium second outlet through a second connecting pipe; A second joint, wherein a first interface of the second joint is connected to the first outlet of the second medium or the inlet of the second medium through a third connecting pipe; A third joint, wherein a first interface of the third joint is connected to a three-medium inlet of the plate heat exchanger through a fourth connecting pipe; a fourth joint, wherein a first interface of the fourth joint is connected to a third medium outlet of the plate heat exchanger through a fifth connecting pipe; a fifth joint, wherein a first interface of the fifth joint is connected to a first medium inlet of the first flow channel through a sixth connecting pipe; A sixth joint, wherein a first interface of the sixth joint is connected to a first medium outlet of the first flow channel through a seventh connecting pipe.

30. The heat exchange device according to claim 29, characterized in that: The housing is provided with six openings; The third interface of the first connector, the second interface of the second connector, the second interface of the third connector, the second interface of the fourth connector, the second interface of the fifth connector and the second interface of the sixth connector extend out of the shell from six openings on the shell respectively.

31. A heating system, characterized in that: include: The heat exchange device according to any one of claims 20 to 30; A heat source, the outlet of the heat source is connected to the first medium inlet of the first flow channel of the heat exchange device, and the inlet of the heat source is connected to the first medium outlet of the first flow channel; or, the outlet of the heat source is connected to the second medium inlet of the second flow channel of the heat exchange device, and the inlet of the heat source is connected to the second medium first outlet and / or the second medium second outlet of the second flow channel.

32. The heating system according to claim 31, characterized in that When the outlet of the heat source is connected to the first medium inlet of the first flow channel of the heat exchange device, and the inlet of the heat source is connected to the first medium outlet of the first flow channel, The second medium inlet of the second flow channel of the heat exchange device is connected to the outlet of the first end, and the second medium first outlet of the second flow channel of the heat exchange device is connected to the inlet of the first end; the third medium inlet of the third flow channel of the heat exchange device is connected to the outlet of the second end, and the third medium outlet of the third flow channel of the heat exchange device is connected to the inlet of the second end.

33. The heating system according to claim 31, characterized in that When the outlet of the heat source is connected to the second medium inlet of the second flow channel of the heat exchange device, and the inlet of the heat source is connected to the second medium first outlet and / or the second medium second outlet of the second flow channel, The first medium inlet of the first flow channel of the heat exchange device is connected to the outlet of the first end, and the first medium outlet of the first flow channel of the heat exchange device is connected to the inlet of the first end; the third medium inlet of the third flow channel of the heat exchange device is connected to the outlet of the second end, and the third medium outlet of the third flow channel of the heat exchange device is connected to the inlet of the second end.

34. The heating system according to claim 32 or 33, characterized in that: The first end and / or the second end is a domestic hot water end or a heating end.

35. The heating system according to claim 32 or 33, characterized in that: The heat source includes at least one of the following: a gas water heater, an electric water heater, a solar water heater, and a heat pump; The first end is a heating end and the second end is a domestic water end, or the first end is a domestic water end and the second end is a heating end.

36. The heating system according to claim 35, characterized in that The domestic water end is a water tank, which includes a cold water inlet, a hot water outlet, a cold water outlet and a hot water inlet; the cold water outlet of the water tank is connected to the third medium inlet of the third flow channel, the hot water inlet of the water tank is connected to the third medium outlet of the third flow channel, and the cold water inlet is connected to a water source.

37. The heating system according to claim 31, characterized in that The heat exchange device is arranged in the housing of the heat source; The outlet and inlet of the heat source are respectively connected to the first medium inlet and the first medium outlet of the first flow channel of the heat exchange device through a connecting pipe in the shell of the heat source; or, the outlet and inlet of the heat source are respectively connected to the second medium inlet and the second medium first outlet and / or the second medium second outlet of the second flow channel of the heat exchange device through a connecting pipe in the shell of the heat source.

38. The heating system according to claim 31, characterized in that The heat exchange device is arranged outside the shell of the heat source; The outlet and inlet of the heat source are respectively connected to the first medium inlet and the first medium outlet of the first flow channel of the heat exchange device through a connecting pipe outside the shell of the heat source; or, the outlet and inlet of the heat source are respectively connected to the second medium inlet and the second medium first outlet and / or the second medium second outlet of the second flow channel of the heat exchange device through a connecting pipe outside the shell of the heat source.

39. The heating system according to claim 32, characterized in that: The heat exchange device is arranged in the housing of the heat source; The shell of the heat source includes at least four openings, and the four openings are respectively used for the third opening of the first joint of the heat exchange device, the second opening of the second joint, the second opening of the third joint and the second opening of the fourth joint to extend out of the shell of the heat source.

40. The heating system according to claim 33, characterized in that The heat exchange device is arranged in the housing of the heat source; The shell of the heat source includes at least four openings, and the four openings are respectively used for the second opening of the third joint, the second opening of the fourth joint, the second opening of the fifth joint and the second opening of the sixth joint of the heat exchange device to extend out of the shell of the heat source.

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