Plate heat exchanger and refrigerant system

Abstract

The invention discloses a plate heat exchanger and a refrigerant system.The plate heat exchanger is internally provided with refrigerant flow paths and a water path which are parallel and exchange heat with each other, and the refrigerant flow paths comprise the first refrigerant flow path and the second refrigerant flow path; the water path comprises a first water path corresponding to the first refrigerant flow path and a second water path corresponding to the second refrigerant flow path, and the water path is provided with a water inlet, a first water outlet corresponding to the first water path and a second water outlet corresponding to the second water path. According to the technical scheme, the equipment investment cost and the maintenance cost of the refrigerant system can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and particularly to a plate heat exchanger and a refrigerant system. Background Art

[0002] Heat pump technology is widely used in domestic hot water and heating. Residents or light commercial buildings have different temperature requirements for domestic hot water and heating hot water. Usually, the temperature of domestic hot water is set at 55°C, while the heating hot water is set at 45°C. In the prior art, usually, domestic hot water and heating hot water are each supplied by a set of independent circulation systems, that is, a set of hot water systems and a set of heating systems. However, this solution requires high costs in terms of initial equipment investment and subsequent maintenance. Summary of the Invention

[0003] The main object of the present invention is to provide a plate heat exchanger, aiming to reduce the equipment investment cost and maintenance cost of the refrigerant system.

[0004] To achieve the above object, the plate heat exchanger proposed by the present invention is provided with a refrigerant flow path and a water flow path that are parallel and exchange heat with each other. The refrigerant flow path includes a first refrigerant flow path and a second refrigerant flow path. The water flow path includes a first water flow path corresponding to the first refrigerant flow path and a second water flow path corresponding to the second refrigerant flow path. The water flow path is provided with a water inlet, a first water outlet corresponding to the first water flow path, and a second water outlet corresponding to the second water flow path.

[0005] Optionally, the water inlet is communicated with both the first water flow path and the second water flow path, and the refrigerant temperatures flowing in the first refrigerant flow path and the second refrigerant flow path are different, so that the water outlet temperatures of the first water outlet and the second water outlet are different.

[0006] Optionally, the water inlet is communicated with the first water flow path, and the first water flow path and the second water flow path are connected in series, so that the water outlet temperatures of the first water outlet and the second water outlet are different.

[0007] Optionally, the plate heat exchanger includes a plurality of plates, which include a number of water channels plates and refrigerant flow path plates that are alternately distributed. The plates have two first flow holes for water to flow through and two second flow holes for refrigerant to flow through. The inner cavity of the water channels plate is connected to the first flow hole and separated from the second flow hole. The inner cavity of the refrigerant flow path plate is connected to the second flow hole and separated from the first flow hole. The plate heat exchanger has opposite first and second ends. The first end is arranged at the first heat exchange part, and the second end is arranged at the second heat exchange part. One first flow hole of the plate at the outermost side of the first end is communicated with the water inlet, and the first flow hole corresponding to the water inlet of the plate at the outermost side of the second end is communicated with the second water outlet. A partition is provided at the first flow hole corresponding to the water inlet of a plate in the middle to connect the first water channel and the second water channel in series.

[0008] Optionally, a partition is provided at the other first flow hole of the plate at the outermost side of the first end, and the other first flow hole of the plate at the outermost side of the second end is communicated with the first water outlet.

[0009] Optionally, the other first flow hole of the plate at the outermost side of the first end is communicated with the first water outlet, and a partition is provided at the other first flow hole of the plate at the outermost side of the second end.

[0010] Optionally, the partition is integrally formed with the plate; or the partition is separately provided from the plate and assembled into one body.

[0011] Optionally, a flow valve is provided at the first water outlet and / or the second water outlet to adjust the water flow rates of the first water outlet and the second water outlet.

[0012] Optionally, the water outlet temperature of the first water outlet is lower than the water outlet temperature of the second water outlet, and the flow valve is provided at the first water outlet.

[0013] The present invention also provides a refrigerant system, including the aforementioned plate heat exchanger.

[0014] Optionally, the refrigerant system further includes a compressor communicated with the plate heat exchanger. The compressor has a first exhaust port corresponding to the first refrigerant flow path and a second exhaust port corresponding to the second refrigerant flow path. The refrigerant pressures of the first exhaust port and the second exhaust port are configured to be different.

[0015] In the technical solution of the present invention, by simultaneously providing a first water outlet and a second water outlet on a single plate heat exchanger system, it is possible to allow the water in the first water circuit and the second water circuit to be output from the first water outlet and the second water outlet respectively after experiencing different degrees of heat exchange, so as to be able to provide hot water at two different water temperatures externally to simultaneously meet different heat usage requirements. Specifically, among the hot water output from the first water outlet and the second water outlet, the hot water with a higher water temperature can be used as domestic hot water, and the hot water with a lower water temperature can be used as heating hot water. In this way, a single plate heat exchanger can achieve the simultaneous supply of hot water at different outlet temperatures, thereby reducing the initial investment cost of the equipment and the subsequent maintenance cost, that is, reducing the usage cost of the refrigerant system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0017] Figure 1 is a schematic structural diagram of an embodiment of the plate heat exchanger of the present invention;

[0018] Figure 2 is another embodiment of the plate heat exchanger of the present invention at Figure 1 a partial structural schematic diagram at the position A shown;

[0019] Figure 3 is Figure 1 a schematic diagram of the water flow direction of the embodiment shown;

[0020] Figure 4 is a schematic diagram of the water flow direction of another embodiment of the plate heat exchanger of the present invention;

[0021] Figure 5 is a schematic diagram of the water flow direction of yet another embodiment of the plate heat exchanger of the present invention;

[0022] Figure 6 is a schematic structural diagram of an embodiment of the refrigerant system of the present invention.

[0023] Description of the reference numerals in the drawings:

[0024]

[0025]

[0026] The realization of the object of the present invention, functional features and advantages will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0029] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0031] Heat pump technology is widely used in domestic hot water and heating. Residents or light commercial buildings have different temperature requirements for domestic hot water and heating hot water. Usually, the temperature of domestic hot water is set at 55°C, while the heating hot water is set at 45°C. In the prior art, usually, domestic hot water and heating hot water are each supplied by a set of independent circulation systems, that is, a set of hot water systems and a set of heating systems. However, this solution requires higher costs in terms of initial equipment investment and subsequent maintenance.

[0032] In view of this, the present invention provides a plate heat exchanger, which is applied to a refrigerant system, and the refrigerant system includes but is not limited to air conditioners and heat pump devices, etc. Among them, the heat pump device includes but is not limited to ATW (Air-Water) heat pump devices and ATA (Air-Air) heat pump devices, etc.

[0033] Please refer to Figures 1 to 5 , in which, Figure 1 and Figure 2 show the structural schematic diagrams of two embodiments of the plate heat exchanger of the present invention. The solid arrows in the figures represent the flow direction of water, and the hollow arrows represent the flow direction of refrigerant. Figures 3 to 5 shows the schematic diagram of the water flow direction of three embodiments of the plate heat exchanger of the present invention, and Figure 3 the shown embodiment corresponds to Figure 1 the shown embodiment. The solid arrows in the figures represent the flow direction of water, and the dashed arrows represent the flow direction of refrigerant. The upper horizontal water path in the figure corresponds to Figure 1 the first flow-through hole in the upper right of the plate shown, and the lower horizontal water path corresponds to Figure 1 the first flow-through hole in the lower right of the plate shown.

[0034] Please refer to Figures 1 to 5 , in some embodiments of the present invention, a refrigerant flow path and a water flow path that are parallel and exchange heat are provided in the plate heat exchanger 10. The refrigerant flow path includes a first refrigerant flow path 101 and a second refrigerant flow path 102. The water flow path includes a first water path 103 corresponding to the first refrigerant flow path 101 and a second water path 104 corresponding to the second refrigerant flow path 102. The water flow path is provided with a water inlet 105, a first water outlet 106 corresponding to the first water path 103, and a second water outlet 107 corresponding to the second water path 104. Both the first refrigerant flow path 101 and the second refrigerant flow path 102 are provided with a liquid inlet 108 and a liquid outlet 109. That is, the plate heat exchanger is configured with an independent dual-refrigerant flow path and sharing the same water flow path structure.

[0035] In the technical solution of the present invention, by simultaneously providing the first water outlet 106 and the second water outlet 107 in the single plate heat exchanger 10 system, it is possible to allow the water in the first water path 103 and the second water path 104 to be output from the first water outlet 106 and the second water outlet 107 respectively after experiencing different degrees of heat exchange, so as to be able to externally provide hot water at two different water temperatures to simultaneously meet different heat usage requirements. Specifically, among the hot water output from the first water outlet 106 and the second water outlet 107, the hot water with a higher water temperature can be used as domestic hot water, and the hot water with a lower water temperature can be used as heating hot water. In this way, through a set of plate heat exchangers 10, it is possible to simultaneously supply hot water at different outlet temperatures, thereby reducing the initial investment cost of the equipment and the subsequent maintenance cost, that is, reducing the usage cost of the refrigerant system.

[0036] It can be understood that in a solution where a multi-connected heating system is adopted to meet the hot water supply of two water temperatures, if heating hot water is given priority, domestic hot water needs to use additional electric auxiliary heating due to the unqualified outlet water temperature, resulting in a large amount of electrical energy consumption; if domestic hot water is given priority, that is, the outlet water temperature is relatively high, it is necessary to mix cold water into the heating facilities to make it reach the required relatively low-temperature hot water, and this method also has high energy consumption. The plate heat exchanger 10 of the present application has a single-inlet and double-outlet water circuit system, and can simultaneously provide hot water of two different water temperatures externally after the water in the first water circuit 103 and the second water circuit 104 undergoes different degrees of heat exchange, so as to simultaneously meet the usage requirements of domestic hot water and heating hot water, and further reduce the energy consumption of the refrigerant system.

[0037] Please refer to Figure 1 or Figure 2 , in some embodiments, the plate heat exchanger 10 includes a plurality of plates, and the plurality of plates include a plurality of water circuit plates 13 and refrigerant flow path plates 14 that are alternately distributed. The plates have two first flow holes 15 for water to flow through and two second flow holes 16 for refrigerant to flow through. The inner cavity of the water circuit plate 13 is connected to the first flow hole 15 and is separated from the second flow hole 16, and the inner cavity of the refrigerant flow path plate 14 is connected to the second flow hole 16 and is separated from the first flow hole 15.

[0038] Furthermore, the two second flow holes 16 of the outermost plate of the first end 10c are respectively connected to a set of liquid inlets 108 and liquid outlets 109, and the two second flow holes of the outermost plate of the second end 10d are respectively connected to another set of liquid inlets 108 and liquid outlets 109.

[0039] Specifically, please refer to Figure 1 , in an embodiment, the two first flow holes 15 and the two second flow holes 16 are respectively arranged at the four corners of the plate. Whether it is the water circuit plate 13 or the refrigerant flow path plate 14, the two first flow holes 15 on the left are used to transport refrigerant, and the two second flow holes 16 on the right are used to transport water; the inner cavity of the refrigerant flow path plate 14 is only connected to the two second flow holes 16 on the left, and the inner cavity of the water circuit plate 13 is only connected to the two first flow holes 15 on the right.

[0040] It can be understood that there are various ways to achieve different degrees of heat exchange. For example, please refer to Figure 1 , Figure 3 and Figure 4, in some embodiments, the water inlet 105 is in communication with the first water path 103, and the first water path 103 and the second water path 104 are connected in series, so that the water outlet temperatures of the first water outlet 106 and the second water outlet 107 are different. In this embodiment, part of the water flowing into the plate heat exchanger 10 from the water inlet 105 flows through the first water path 103 and then directly flows out from the first water outlet 106, and the other part continues to flow through the second water path 104 and then flows out from the second water outlet 107. In this way, the hot water flowing out from the second water outlet 107 has a higher water temperature after two heat exchanges. It can be understood that at this time, the refrigerant temperatures in the first refrigerant flow path 101 and the second refrigerant flow path 102 can be set to be the same or different.

[0041] Please refer to Figure 1 , optionally, the plate heat exchanger 10 has opposite first end 10c and second end 10d. The first end 10c is disposed in the first heat exchange portion 10a, and the second end 10d is disposed in the second heat exchange portion 10b. A first flow hole 15 of a plate on the outermost side of the first end 10c is in communication with the water inlet 105. The first flow hole 15 corresponding to the water inlet 105 of the plate on the outermost side of the second end 10d is in communication with the second water outlet 107. A partition 11 is provided in the first flow hole 15 corresponding to the water inlet 105 of a plate in the middle to connect the first water path 103 and the second water path 104 in series.

[0042] Specifically, please refer to Figure 1 , the upper right first flow hole 15 of the refrigerant flow path plate 14 on the outermost side of the first end 10c is in communication with the water inlet 105, and a partition 11 is provided in the lower right first flow hole 15 of the refrigerant flow path plate 14 to block the water from flowing through the first flow hole 15. The upper left and lower left second flow holes 16 of the refrigerant flow path plate 14 are respectively in communication with external refrigerant pipes to form a first independent refrigerant circuit; the upper right first flow hole 15 of the refrigerant flow path plate 14 on the outermost side of the second end 10d is in communication with the second water outlet 107, and the upper left and lower left second flow holes 16 of the refrigerant flow path plate 14 are in communication with external refrigerant pipes to form a second independent refrigerant circuit; a partition 11 is provided in the upper right first flow hole 15 of a refrigerant flow path plate in the middle to block the water from flowing through the first flow hole 15. In this way, the water in the first heat exchange portion 10a cannot flow into the second heat exchange portion 10b through the first flow hole 15 and can only flow into the second heat exchange portion 10b through the lower right first flow hole 15 of the refrigerant flow path plate 14, thereby realizing the series connection of the first water path and the second water path. In this way, the hot water flowing out from the second water outlet 107 undergoes two heat exchanges successively on the first heat exchange portion and the second heat exchange portion and has a higher water temperature.

[0043] It can be understood that the plate located on the outermost side of the first end portion 10c, and the plate located on the outermost side of the first end portion 10c can also be a water channel plate, not limited to only Figure 1 the refrigerant flow path plate of the illustrated embodiment. The present application does not make specific limitations thereto.

[0044] The arrangement position of the second water outlet 107 has various forms. For example, please refer to Figure 1 and Figure 3 , in an embodiment, a partition 11 is provided in another first flow hole 15 of the plate located on the outermost side of the first end portion 10c, and another first flow hole 15 of the plate located on the outermost side of the second end portion 10d communicates with the first water outlet 106. Of course, in another embodiment, it can also be that another first flow hole 15 of the plate located on the outermost side of the first end portion 10c communicates with the first water outlet 106, and a partition 11 is provided in another first flow hole 15 of the plate located on the outermost side of the second end portion 10d.

[0045] Specifically, please refer to Figure 1 and Figure 3 , in an embodiment, a partition 11 is provided in the lower right first flow hole 15 of the refrigerant flow path plate 14 located on the outermost side of the first end portion 10c to block water from flowing out of the plate heat exchanger through this first flow hole 15, and the lower right first flow hole 15 of the refrigerant flow path plate 14 located on the outermost side of the second end portion 10d communicates with the first water outlet 106. At this time, the first water outlet 106 and the second water outlet 107 are arranged in the same direction. In this way, the centralized arrangement of the water outlet pipeline can be facilitated.

[0046] Please refer to Figure 5 , in yet another embodiment, the first water outlet 106 and the second water outlet 107 are arranged in opposite directions. Specifically, the lower right first flow hole 15 of the refrigerant flow path plate 14 located on the outermost side of the first end portion 10c communicates with the first water outlet 106, and a partition 11 is provided in the lower right first flow hole 15 of the refrigerant flow path plate 14 located on the outermost side of the second end portion 10d to block water from flowing out of the plate heat exchanger through this first flow hole 15.

[0047] It can be understood that the partition 11 can be directly formed on the plate, that is, the partition 11 is directly integrally formed during the manufacturing of the plate. At this time, there is no first flow hole 15 in the area corresponding to the partition 11 after the plate is manufactured and formed; the partition 11 can also be formed separately from the plate and then assembled into one body. At this time, the manufactured and formed plate has four through holes, and the partition 11 is assembled and fixed in the first flow hole 15 of the plate by means of bonding, welding, etc.

[0048] Please refer to Figure 1, in one embodiment, optionally, the partition 11 for changing the refrigerant flow direction (referred to as the refrigerant-side partition 11) and the partition 11 for changing the water flow direction (referred to as the water-side partition 11) are provided on different plates. Specifically, in this embodiment, the refrigerant-side partition 11 is provided on an adjacent plate in front of the water-side partition 11. Of course, in other embodiments, the refrigerant-side partition 11 can also be provided on an adjacent plate behind the water-side partition 11.

[0049] Please refer to Figure 2 , in another embodiment, the refrigerant-side partition 11 and the water-side partition 11 can also be provided on the same plate. Specifically, the fourth plate from the front to the back is provided with both the refrigerant-side partition 11 and the water-side partition 11. At this time, the water-side partition 11 is provided as a half partition, that is, the water-side partition 11 only blocks the rear side of the first flow hole 15 in the upper right of the plate, but the first flow hole 15 is still connected to the inner cavity of the plate. Then, water cannot flow through the first flow hole 15 but can turn and flow into the inner cavity of the plate. Since the half partition means that only one side of the first flow hole 15 is blocked, correspondingly, the full partition means that both the front and rear sides of the first flow hole 15 are blocked. It can be understood that at this time, the refrigerant-side partition 11 can be either a full partition or a half partition, and the refrigerant will not flow into this plate.

[0050] Of course, in other embodiments, it can also be that the fifth plate from the front to the back is provided with both the refrigerant-side partition 11 and the water-side partition 11. At this time, the refrigerant-side partition 11 is provided as a half partition, and the water-side partition 11 can be either a full partition or a half partition. Those skilled in the art can adjust the layout position of the partition 11 according to needs.

[0051] Of course, other methods can also be used to achieve different degrees of heat exchange. For example, please refer to Figure 5 , in still another embodiment, the water inlet 105 is connected to both the first water path 103 and the second water path 104, and the refrigerant pressures flowing into the first refrigerant flow path 101 and the second refrigerant flow path 102 are configured to be different, so that the outlet water temperatures of the first water outlet 106 and the second water outlet 107 are different. Specifically and optionally, one water-side partition in this embodiment is provided on the refrigerant flow path plate at the outermost side of the second end 10d, and the other water-side partition is provided on the refrigerant flow path plate in the middle, so that the water flowing into the plate heat exchanger 10 from the water inlet 105 is divided into two streams and flows in the first water path 103 and the second water path 104 respectively, and exchanges heat with the refrigerant in the first refrigerant flow path 101 and the second refrigerant flow path 102 respectively, and then these two streams of hot water flow out of the plate heat exchanger respectively. By setting the refrigerant temperatures in these two refrigerant flow paths to be different, different degrees of heat exchange between the first water path 103 and the second water path 104 are achieved. That is, the first water path 103 and the second water path 104 are arranged in parallel.

[0052] There are various ways to achieve different refrigerant temperatures. For example, please refer to Figure 6 , in an embodiment of the refrigerant system, the refrigerant system includes a compressor 20, a second heat exchanger 40, and a first throttling device 30. The compressor 20, the plate heat exchanger 10, the first throttling device 30, and the second heat exchanger 40 are connected in sequence. The compressor 20 has at least two exhaust ports. The at least two exhaust ports include a first exhaust port 201 corresponding to the first refrigerant flow path 101 and a second exhaust port 202 corresponding to the second refrigerant flow path 102. The refrigerant pressures of the first exhaust port 201 and the second exhaust port 202 are different. That is, through a single compressor 20 with double exhausts, the temperatures of the two refrigerant flows input into the plate heat exchanger 10 are different, and the structure is simple and easy to implement.

[0053] In this embodiment, further optionally, the first exhaust port 201 and the second exhaust port 202 of the double-exhaust compressor 20 respectively output medium-pressure refrigerant and high-pressure refrigerant, and the ratio of the exhaust volumes of the medium-pressure refrigerant and the high-pressure refrigerant ranges from 1.5 to 3. Preferably, the ratio of the exhaust volumes of the medium-pressure refrigerant and the high-pressure refrigerant is 2:1, so that the water temperatures of the first water outlet 106 and the second water outlet 107 do not differ too much. Of course, in other embodiments, two independent compressors 20 that operate independently and output different refrigerant pressures can also be provided, which are respectively connected to the first refrigerant flow path 101 and the second refrigerant flow path 102 to achieve different temperatures of the two refrigerant flows input into the plate heat exchanger 10.

[0054] It can be understood that using a single compressor 20 to output multiple refrigerant flows with different pressures is based on the idea of cascaded utilization of energy. Therefore, this application does not specifically limit the number of exhaust ports of the compressor 20, refrigerant flow paths, and water paths. That is, when using a large-displacement compressor 20 with three or more exhaust ports, the plate heat exchanger 10 can be synchronously provided with corresponding numbers of refrigerant flow paths and water paths, so as to fully exert the effect of cascaded utilization of energy.

[0055] Of course, in other embodiments, it can also be that the refrigerant temperatures of the first refrigerant flow path 101 and the second refrigerant flow path 102 are configured to be the same, and the effective heat exchange areas of the first water path 103 and the second water path 104 are configured to be different. For example, in an embodiment where the water inlet 105 is connected to both the first water path 103 and the second water path 104, optionally, the heat exchange path between the first refrigerant flow path 101 and the first water path 103 is longer, or the total heat exchange area between the two is larger, so that the water temperature of the first water outlet 106 is higher.

[0056] Please refer to Figures 1 to 5 , it can be understood that optionally in the embodiment of the present invention, regardless of the water flow directions in the first water path 103 and the second water path 104, the refrigerant flow direction is configured to be opposite thereto. In this way, the heat exchange efficiency between water and refrigerant can be improved.

[0057] Please refer to Figure 6 , in some embodiments, a flow valve 12 is provided on the first water outlet 106 and / or the second water outlet 107 to adjust the water flow rate of the first water outlet 106 and the second water outlet 107. In this way, by controlling the flow valve 12, the water flow rate can be adjusted, and the flow rate and water temperature of the corresponding water circuit can be adjusted according to the user's load demand. That is, variable load adjustment is achieved, thereby improving the convenience and flexibility of the refrigerant system. It can be understood that if the flow valve 12 is completely closed, the water circuit of the plate heat exchanger 10 changes from a single-in double-out system to a single-in single-out system. Of course, in other embodiments, solenoid valves can also be provided at both the first water outlet 106 and the second water outlet 107, or the flow valve 12 can be not provided.

[0058] The water outlet temperature of the first water outlet 106 is lower than the water outlet temperature of the second water outlet 107, and the flow valve 12 is provided on the first water outlet 106. In this way, by setting the flow valve 12 on the first water outlet 106 with a lower water outlet temperature, the first water outlet 106 can be completely closed, thus meeting the user's demand for only using domestic hot water. Of course, in other embodiments, the flow valve 12 can also be provided on the second water outlet 107, or flow valves 12 are provided on both the first water outlet 106 and the second water outlet 107.

[0059] Please refer to Figure 6 , the present invention also proposes a refrigerant system, including the aforementioned plate heat exchanger 10. The specific structure of the plate heat exchanger 10 refers to the above embodiments. Since this refrigerant system adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0060] Please refer to Figure 6 , in an embodiment, the refrigerant system includes a compressor 20, a second heat exchanger 40, and a first throttling device 30. The compressor 20, the plate heat exchanger 10, the first throttling device 30, and the second heat exchanger 40 are connected in sequence. The compressor 20 has at least two exhaust ports. The at least two exhaust ports include a first exhaust port 201 corresponding to the first refrigerant flow path 101 and a second exhaust port 202 corresponding to the second refrigerant flow path 102. The refrigerant pressures of the first exhaust port 201 and the second exhaust port 202 are configured to be different. That is, through a single compressor 20 with double exhaust, the temperatures of the two refrigerant flows input into the plate heat exchanger 10 are different, which is simple in structure and easy to implement, and is convenient for the transportation and installation of the refrigerant system. Of course, in other embodiments, two compressors 20 operating independently and having different output refrigerant pressures can also be provided, which are respectively connected to the first refrigerant flow path 101 and the second refrigerant flow path 102 to achieve different temperatures of the two refrigerant flows input into the plate heat exchanger 10.

[0061] In one embodiment, the refrigerant system further includes a second throttling device 51 that connects the plate heat exchanger 10 and the first throttling device 30. The second throttling device 50 is correspondingly arranged in the refrigerant flow path with a larger refrigerant pressure among the first refrigerant flow path 101 and the second refrigerant flow path 102. In this way, the second throttling device 51 pre-throttles the refrigerant flow path with a larger pressure to reduce its refrigerant pressure, which is beneficial to the convergence of the refrigerant in this refrigerant flow path and the refrigerant in the other refrigerant flow path downstream. Of course, in other embodiments, the second throttling device 51 may not be added.

[0062] In one embodiment, the refrigerant system further includes an economizer 61, a gas supply pipeline 62, and a third throttling device 63. The economizer 61 is provided with a third refrigerant flow path 611 and a fourth refrigerant flow path 612 for heat exchange. The first end of the third refrigerant flow path 611 is connected to the plate heat exchanger 10. The first end of the second heat exchanger 40 is connected to the second end of the third refrigerant flow path 611 and the first end of the fourth refrigerant flow path 612. The second end of the second heat exchanger 40 is connected to the suction port 203 of the compressor 20. The second end of the fourth refrigerant flow path 612 is connected to the gas supply port 204 of the compressor 20 through the gas supply pipeline 62. In this way, the effect of gas injection and enthalpy increase can be achieved to improve the operating efficiency of the refrigerant system and reduce energy consumption.

[0063] In one embodiment, the refrigerant system further includes a gas-liquid separator 70. The gas-liquid separator 70 is connected to the second end of the second heat exchanger 40 and the suction port 203 of the compressor 20. In this way, the problem of refrigerant liquid slugging can be avoided. Of course, in other embodiments, the gas-liquid separator 70 may not be provided.

[0064] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A plate heat exchanger, characterized in that, the plate heat exchanger is provided with a refrigerant flow path and a water flow path that are parallel and exchange heat. The refrigerant flow path includes a first refrigerant flow path and a second refrigerant flow path. The water flow path includes a first water flow path corresponding to the first refrigerant flow path and a second water flow path corresponding to the second refrigerant flow path. The water flow path is provided with a water inlet, a first water outlet corresponding to the first water flow path, and a second water outlet corresponding to the second water flow path.

2. The plate heat exchanger according to claim 1, characterized in that, the water inlet is communicated with both the first water flow path and the second water flow path, and the refrigerant pressures flowing into the first refrigerant flow path and the second refrigerant flow path are configured to be different, so that the water outlet temperatures of the first water outlet and the second water outlet are different.

3. The plate heat exchanger according to claim 1, characterized in that, the water inlet is communicated with the first water flow path, and the first water flow path and the second water flow path are connected in series, so that the water outlet temperatures of the first water outlet and the second water outlet are different.

4. The plate heat exchanger according to claim 3, characterized in that, the plate heat exchanger includes a plurality of plates. The plurality of plates include a plurality of water flow path plates and refrigerant flow path plates that are alternately distributed. The plates have two first flow holes for water to flow through and two second flow holes for refrigerant to flow through. The inner cavity of the water flow path plate is communicated with the first flow hole and is separated from the second flow hole. The inner cavity of the refrigerant flow path plate is communicated with the second flow hole and is separated from the first flow hole; the plate heat exchanger has opposite first and second ends. The first end is arranged in the first heat exchange part, and the second end is arranged in the second heat exchange part. One first flow hole of the plate located on the outermost side of the first end is communicated with the water inlet, and the first flow hole corresponding to the water inlet of the plate located on the outermost side of the second end is communicated with the second water outlet. A partition is provided on the first flow hole corresponding to the water inlet of a plate located in the middle, so that the first water flow path and the second water flow path are connected in series.

5. The plate heat exchanger according to claim 4, characterized in that, a partition is provided on the other first flow hole of the plate located on the outermost side of the first end, and the other first flow hole of the plate located on the outermost side of the second end is communicated with the first water outlet; or, the other first flow hole of the plate located on the outermost side of the first end is communicated with the first water outlet, and a partition is provided on the other first flow hole of the plate located on the outermost side of the second end.

6. The plate heat exchanger according to claim 4, characterized in that, the partition is integrally formed with the plate; or, the partition is separately provided from the plate and assembled into one body.

7. The plate heat exchanger according to any one of claims 1 to 6, characterized in that, a flow valve is provided on the first water outlet and / or the second water outlet to adjust the water outlet flow rates of the first water outlet and the second water outlet.

8. The plate heat exchanger according to claim 7, characterized in that, The outlet water temperature of the first outlet is lower than that of the second outlet, and the flow valve is arranged at the first outlet.

9. A refrigerant system, characterized in that it includes the plate heat exchanger according to any one of claims 1 to 8.

10. The refrigerant system according to claim 9, characterized in that the refrigerant system further includes a compressor communicated with the plate heat exchanger. The compressor has a first exhaust port corresponding to the first refrigerant flow path and a second exhaust port corresponding to the second refrigerant flow path. The refrigerant pressures of the first exhaust port and the second exhaust port are configured to be different.

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