Plate heat exchanger

Abstract

The invention is suitable for the technical field of heat exchangers, and provides a plate heat exchanger which comprises a plurality of heat exchange units, each heat exchange unit comprises two first plate sheets, the edges of the first plate sheets are provided with turnups, and the turnups of the two first plate sheets are connected with each other to form a cavity. A second plate sheet and a third plate sheet are arranged between the two first plate sheets, the second plate sheet divides the interior of the cavity into a refrigerant flow channel and a cooling liquid flow channel, and the third plate sheet is arranged in the cooling liquid flow channel. According to the plate heat exchanger, the structure of a traditional plate heat exchanger is broken through and changed by adopting a special structure, the flow channel resistance of refrigerants and cooling liquid can be reduced to a large extent, the heat exchange capacity of the heat exchanger is improved, and the distribution uniformity of fluid in the channels is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchangers, and in particular relates to a plate heat exchanger. Background Art

[0002] Plate heat exchanger is a high-efficiency heat exchanger. In the refrigeration system, plate heat exchanger is widely used as evaporator and condenser. It is one of the core components of the refrigeration system and its performance has a great impact on the refrigeration system.

[0003] The working principle of the plate heat exchanger is to use the channels between the plates for heat exchange. The working fluid flows through the narrow and tortuous channels formed between the two plates. Since the plates are corrugated and the cross-section changes are complex, the flow direction and flow rate of the fluid are constantly changing, thereby increasing the disturbance of the fluid and the heat transfer effect. On this basis, how to reduce the flow resistance of the refrigerant and coolant in the plate heat exchanger while ensuring the heat exchange capacity is of great significance to improving the operating efficiency of the refrigeration system and reducing the power consumption of the refrigeration system. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a plate heat exchanger, aiming to solve the problems raised in the above background technology.

[0005] The embodiment of the present invention is implemented as follows: a plate heat exchanger includes a plurality of heat exchange units, wherein the heat exchange units include two first plates, the edges of the first plates are provided with flanges, and the flanges of the edges of the two first plates are connected to each other to form a chamber, a second plate and a third plate are provided between the two first plates, the second plate divides the inner part of the chamber into a refrigerant flow channel and a coolant flow channel, and the third plate is provided in the coolant flow channel;

[0006] Two first inlets are symmetrically distributed at both ends of the middle part of the first plate, the first inlets are formed by stamping and formed into flanges, and the stamping directions of the two first inlets are opposite, one of the first inlets is used as a refrigerant inlet, and the other first inlet is used as a coolant inlet, and four first outlets are symmetrically distributed at the four corners of the first plate, the first outlets are also formed by stamping and formed into flanges, and the stamping directions of the first outlets along the length direction of the first plate are opposite, and the stamping directions of the first outlets along the width direction of the first plate are the same, the two first outlets close to the refrigerant inlet side are used as coolant outlets, and the first outlet close to the coolant inlet side is used as a refrigerant outlet;

[0007] The second plate is distributed with convex points, and the upper surface and the lower surface of the convex points are both composed of two semi-ellipses with different major axes and the same minor axes, and the semi-ellipse on the upper surface is smaller than the semi-ellipse on the lower surface, and the semi-ellipse with the shorter major axis is opposite to the refrigerant inlet. The second plate is provided with two second inlets by stamping along the middle part of its width direction, and the stamping directions of the two second inlets are opposite, and the edge of the second inlet is also provided with a flange, and the four corners of the second plate are symmetrically distributed with four second outlets, and the second outlets are also formed by stamping and form flanges, the two second outlets along the width direction of the second plate are in the same direction, and the two second outlets along the length direction of the second plate are in opposite directions, and the flanges abutting against each other between the second plate and the first plate form a channel by welding for the input and output of coolant and refrigerant.

[0008] According to a further technical solution, the flanges of the two first plate edges are connected by welding, specifically, by brazing.

[0009] According to a further technical solution, a refrigerant inlet pipe is installed at the refrigerant inlet, a coolant inlet pipe is installed at the coolant inlet, a coolant outlet pipe is installed at the coolant outlet, and a refrigerant outlet pipe is installed at the refrigerant outlet.

[0010] According to a further technical solution, the third plate is an inner fin type plate, two holes are symmetrically opened in the middle of the third plate along its width direction, and four holes are opened at the four corners of the third plate.

[0011] A plate heat exchanger provided in an embodiment of the present invention breaks through and changes the structure of a traditional plate heat exchanger by adopting a special structure, thereby being able to reduce the flow resistance of the refrigerant and the coolant to a large extent, improve the heat exchange capacity of the heat exchanger, and ensure the uniformity of the fluid distribution in the channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the assembly of a plate heat exchanger provided in an embodiment of the present invention;

[0013] Figure 2 A schematic structural diagram of a first plate in a plate heat exchanger provided in an embodiment of the present invention;

[0014] Figure 3 A schematic structural diagram of a second plate in a plate heat exchanger provided in an embodiment of the present invention;

[0015] Figure 4 A schematic structural diagram of a third plate in a plate heat exchanger provided in an embodiment of the present invention;

[0016] Figure 5A cross-sectional view along the width direction of a plate heat exchanger provided by an embodiment of the present invention;

[0017] Figure 6 A schematic diagram of the overall structure of a plate heat exchanger provided in an embodiment of the present invention;

[0018] Figure 7 A schematic structural diagram of the cooperation between a first plate, a second plate and a third plate in a plate heat exchanger provided in an embodiment of the present invention;

[0019] Figure 8 A temperature distribution diagram of the refrigerant side of a plate heat exchanger provided in an embodiment of the present invention;

[0020] Fig. 9 A temperature distribution diagram of the coolant side of a plate heat exchanger provided in an embodiment of the present invention;

[0021] Fig.10 A refrigerant side pressure distribution diagram of a plate heat exchanger provided in an embodiment of the present invention;

[0022] Fig.11 A pressure distribution diagram of the coolant side of a plate heat exchanger provided in an embodiment of the present invention.

[0023] In the accompanying drawings: 1-first plate; 2-second plate; 21-protrusion; 3-third plate; 4-refrigerant inlet pipe; 5-refrigerant outlet pipe; 6-cooling liquid inlet pipe; 7-cooling liquid outlet pipe. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0026] like Figure 1-7 As shown, a plate heat exchanger provided by an embodiment of the present invention comprises a plurality of heat exchange units, wherein the heat exchange unit comprises two first plates 1, the edges of the first plates 1 are provided with flanges, and the flanges of the edges of the two first plates 1 are connected to each other to form a chamber, a second plate 2 and a third plate 3 are provided between the two first plates 1, the second plate 2 divides the inner part of the chamber into a refrigerant flow channel and a coolant flow channel, and the third plate 3 is provided in the coolant flow channel;

[0027] Two first inlets are symmetrically distributed at both ends of the middle part of the first plate 1, the first inlets are formed by stamping and flanging, and the stamping directions of the two first inlets are opposite, one of the first inlets is used as a refrigerant inlet, and the other first inlet is used as a coolant inlet, and four first outlets are symmetrically distributed at the four corners of the first plate 1, the first outlets are also formed by stamping and flanging, and the stamping directions of the first outlets along the length direction of the first plate 1 are opposite, and the stamping directions of the first outlets along the width direction of the first plate 1 are the same, the two first outlets close to the refrigerant inlet side are used as coolant outlets, and the first outlet close to the coolant inlet side is used as a refrigerant outlet;

[0028] The second plate 2 is provided with protrusions 21, and the upper and lower surfaces of the protrusions 21 are both composed of two semi-ellipses with different major axes and the same minor axes, and the semi-ellipse on the upper surface is smaller than the semi-ellipse on the lower surface, and the semi-ellipse with the shorter major axis is opposite to the refrigerant inlet. The second plate 2 is provided with two second inlets by stamping along the middle part in the width direction thereof, and the stamping directions of the two second inlets are opposite, and the edge of the second inlet is also provided with a flange, and four second outlets are symmetrically distributed at the four corners of the second plate 2, and the second outlets are also formed by stamping and form flanges, and the two second outlets along the width direction of the second plate 2 are in the same direction, and the two second outlets along the length direction of the second plate 2 are in opposite directions, and the flanges abutting against each other between the second plate 2 and the first plate 1 form a channel by welding for inputting and outputting coolant and refrigerant.

[0029] As a preferred embodiment of the present invention, the flanges of the edges of the two first plates 1 are connected by welding, specifically, by brazing.

[0030] As a preferred embodiment of the present invention, a refrigerant inlet pipe 4 is installed at the refrigerant inlet, a coolant inlet pipe 6 is installed at the coolant inlet, a coolant outlet pipe 7 is installed at the coolant outlet, and a refrigerant outlet pipe 5 is installed at the refrigerant outlet.

[0031] As a preferred embodiment of the present invention, the third plate 3 is an inner fin type plate, and the third plate 3 has two holes symmetrically opened in the middle along its width direction, and four holes are opened at the four corners of the third plate 3, and each hole is used to match the channel between the second plate 2 and the first plate 1.

[0032] like Figure 7-10As shown, the simulation analysis is introduced to further illustrate the effect of this device. The heat exchanger material used in the simulation is aluminum alloy, the refrigerant flow channel is 21 layers, the coolant flow channel is 22 layers, R134a is used as the refrigerant, and the ethylene glycol aqueous solution with a volume fraction of 50% is used as the coolant. In order to improve the calculation efficiency, the simulation assumes that the refrigerant and the coolant are distributed equally between each flow channel, and a layer of refrigerant and a layer of coolant are used. The target heat exchange of the simulation is 4500W, and the simulated working conditions are shown in Table 1:

[0033] Table 1

[0034] Refrigerant valve front pressure MPa 1 Refrigerant valve front temperature ℃ 34.4 Refrigerant valve evaporation temperature ℃ -12.7 Refrigerant inlet mass flow kg / h 102.76 Antifreeze inlet temperature ℃ 5 Antifreeze inlet mass flow kg / h 649.2

[0035] The simulation results are shown in Table 2:

[0036] Table 2

[0037] Antifreeze outlet temperature ℃ -3.3 Refrigerant outlet temperature ℃ -7.2 Antifreeze side pressure drop kPa 2.2 Refrigerant side pressure drop kPa 0.4 Overall heat transfer W 4554

[0038] Figure 8 is the temperature distribution on the refrigerant side, Fig. 9 The temperature distribution on the coolant side is that the refrigerant is evenly distributed during the flow process, there is an obvious overheating area at the outlet, the coolant temperature is evenly distributed, the temperature distribution at different positions in the width direction is basically the same, and the overall heat exchange effect is good. Fig.10 is the pressure distribution on the refrigerant side, Fig.11 It is the pressure distribution on the coolant side. The pressure drops on both the refrigerant and coolant sides are evenly distributed and the pressure drops are small.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A plate heat exchanger, characterized in that: The heat exchange unit comprises two first plates, the edges of the first plates are provided with flanges, and the flanges of the edges of the two first plates are connected to each other to form a chamber, a second plate and a third plate are arranged between the two first plates, the second plate divides the inner part of the chamber into a refrigerant flow channel and a coolant flow channel, and the third plate is arranged in the coolant flow channel; Two first inlets are symmetrically distributed at both ends of the middle part of the first plate, the first inlets are formed by stamping and formed into flanges, and the stamping directions of the two first inlets are opposite, one of the first inlets is used as a refrigerant inlet, and the other first inlet is used as a coolant inlet, and four first outlets are symmetrically distributed at the four corners of the first plate, the first outlets are also formed by stamping and formed into flanges, and the stamping directions of the first outlets along the length direction of the first plate are opposite, and the stamping directions of the first outlets along the width direction of the first plate are the same, the two first outlets close to the refrigerant inlet side are used as coolant outlets, and the first outlet close to the coolant inlet side is used as a refrigerant outlet; The second plate is distributed with convex points, and the upper surface and the lower surface of the convex points are both composed of two semi-ellipses with different major axes and the same minor axes, and the semi-ellipse on the upper surface is smaller than the semi-ellipse on the lower surface, and the semi-ellipse with the shorter major axis is opposite to the refrigerant inlet. The second plate is provided with two second inlets by stamping along the middle part of its width direction, and the stamping directions of the two second inlets are opposite, and the edge of the second inlet is also provided with a flange, and the four corners of the second plate are symmetrically distributed with four second outlets, and the second outlets are also formed by stamping and form flanges, the two second outlets along the width direction of the second plate are in the same direction, and the two second outlets along the length direction of the second plate are in opposite directions, and the flanges abutting against each other between the second plate and the first plate form a channel by welding for the input and output of coolant and refrigerant.

2. The plate heat exchanger according to claim 1, characterized in that: The flanges of the two first plate edges are connected by welding.

3. The plate heat exchanger according to claim 1, characterized in that: A refrigerant input pipe is installed at the refrigerant input port, a coolant input pipe is installed at the coolant input port, a coolant output pipe is installed at the coolant output port, and a refrigerant output pipe is installed at the refrigerant output port.

4. The plate heat exchanger according to claim 2, characterized in that: The third plate is an inner fin type plate, and two holes are symmetrically opened in the middle of the third plate along its width direction, and four holes are opened at the four corners of the third plate.

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