Plate heat exchanger with flow equalizing structure

Abstract

The utility model belongs to the technical field of heat exchangers, and relates to a plate heat exchanger with a flow equalizing structure, which comprises a heat exchanger body formed by laminating core plates, and a plurality of refrigerant flow channels and cooling liquid flow channels which are distributed in a layered manner are arranged in the heat exchanger body; a refrigerant inlet, a refrigerant outlet, a cooling liquid outlet and a cooling liquid inlet are formed in the heat exchanger body; one end of each layer of refrigerant flow channel is communicated with the refrigerant inlet, and the other end of each layer of refrigerant flow channel is communicated with the refrigerant outlet; the refrigerant inlet is provided with a straight-through pipe which transversely penetrates through each layer of refrigerant flow channel, the straight-through pipe is provided with a plurality of through holes, the positions of the through holes correspond to the positions of each layer of refrigerant flow channel, and a refrigerant uniformly flows into each layer of refrigerant flow channel through the through holes. According to the utility model, the nozzle is changed into the straight-through pipe from the inlet to the bottom, and the straight-through pipe is perforated according to the flow velocity rule of the medium, so that the flow equalization of the medium is realized, and the flow velocity uniformity of the medium fluid in each layer is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchangers and relates to a plate type heat exchanger with a flow-balanced structure. Background Art

[0002] The power battery of new energy vehicles is the core component of electric vehicles. Its performance and life are closely related to the ambient temperature. Too high or too low temperature will affect the performance and life of the battery. Therefore, in order to ensure the safety, stability and service life of the battery, the power battery needs to be temperature controlled, which will add a battery cooling circuit. In the battery cooling circuit, the medium in the circuit will take away the heat from the battery and perform heat exchange in the heat exchanger of the circuit to achieve battery cooling. Therefore, the heat exchange performance of the heat exchanger directly affects the performance of the entire battery cooling system, thereby affecting all aspects of the performance of the power battery.

[0003] The heat exchanger currently used in the circuit is generally a plate heat exchanger, which is composed of a series of metal sheets with a certain corrugated shape. A medium channel is formed between each plate, and the cold and hot fluids are separated into layers to form convection, and then heat exchange is carried out through the metal plates.

[0004] There are many parameters that affect the heat transfer performance of plate heat exchangers, including the wave height, wave width, and waveform of the core plate. One of the influencing factors is the uniformity of the flow rate between each layer of medium. The uniformity of the flow rate between each layer of the internal medium is an important indicator for evaluating the heat transfer performance of a plate heat exchanger. In order to cope with the problem of large flow resistance of the heat exchanger, a nozzle structure is designed at the inlet of the traditional plate heat exchanger for rectification. However, the nozzle bundles the fluid, making the flow rate uniformity between each layer poor. The problem caused by poor flow rate uniformity is that the flow resistance of the plate heat exchanger increases and the heat transfer performance of the heat exchanger decreases.

[0005] The existing plate heat exchanger inlet structure is as follows Figures 1 to 3 As shown, the medium directly enters the plate heat exchanger chamber from the inlet nozzle, and then flows from the chamber to the gaps between each layer of plates. The existing plate heat exchanger does not have a flow-averaging structure, so the flow rate of each layer is uncontrollable, and the different inlet flow rates have different effects on the flow rate of each layer. Utility Model Content

[0006] In view of this, the purpose of the utility model is to solve the above problems and provide a plate heat exchanger with a flow-balanced structure, which can improve the flow rate uniformity of the fluid between the layers of the plate heat exchanger, reduce the flow resistance of the plate heat exchanger, and improve the heat exchange performance of the product.

[0007] In order to achieve the above object, the utility model provides the following technical solutions:

[0008] A plate heat exchanger with a uniform flow structure comprises a heat exchanger body formed by laminating core plates, wherein the heat exchanger body is provided with a plurality of refrigerant flow channels and coolant flow channels distributed in layers; the heat exchanger body is provided with a refrigerant inlet, a refrigerant outlet, a coolant outlet, and a coolant inlet; one end of each layer of the refrigerant flow channel is communicated with the refrigerant inlet, and the other end is communicated with the refrigerant outlet;

[0009] The refrigerant inlet is provided with a straight pipe that crosses each layer of refrigerant flow channels. The straight pipe is provided with a plurality of through holes. The positions of the through holes correspond to the positions of each layer of refrigerant flow channels. The refrigerant flows evenly into each layer of refrigerant flow channels through the through holes.

[0010] Furthermore, the refrigerant flow channel and the coolant flow channel are both formed by stacking core plates, and the refrigerant and the coolant are separated by passing through the core plates, and heat exchange is performed through the core plates.

[0011] Furthermore, the core plate is a metal core plate.

[0012] The beneficial effects of the utility model are:

[0013] The utility model changes the nozzle into a straight pipe from the inlet to the bottom, and punches holes on the straight pipe according to the medium flow rate law, so as to achieve the uniform flow of the medium, thereby improving the flow rate uniformity of each layer of medium fluid.

[0014] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings, in which:

[0016] Figure 1 It is an overall schematic diagram of the plate heat exchanger with a flow-balanced structure in the utility model.

[0017] Figure 2 It is a schematic diagram of the flow channel of the plate heat exchanger of the utility model.

[0018] Figure 3 Schematic diagram of the refrigerant inlet of a traditional plate heat exchanger.

[0019] Figure 4 It is a schematic diagram of the straight-through pipe in the utility model.

[0020] Figure 5It is a cross-sectional view of the straight-through pipe in the utility model.

[0021] Figure numerals: 1-refrigerant inlet; 2-refrigerant outlet; 3-coolant outlet; 4-coolant inlet; 5-core plate; 6-refrigerant flow channel; 7-coolant flow channel; 8-straight pipe; 9-through hole. DETAILED DESCRIPTION

[0022] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0023] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present utility model. In order to better illustrate the embodiments of the present utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0024] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] See also Figure 1 , 2, 4, 5, are plate heat exchangers with a uniform flow structure, including a heat exchanger body formed by stacking core plates 5, and a plurality of refrigerant flow channels 6 and coolant flow channels 7 distributed in layers are arranged in the heat exchanger body; a refrigerant inlet 1, a refrigerant outlet 2, a coolant outlet 3, and a coolant inlet 4 are arranged on the heat exchanger body; one end of each layer of refrigerant flow channels 6 is connected to the refrigerant inlet 1, and the other end is connected to the refrigerant outlet 2; a straight pipe 8 is arranged on the refrigerant inlet 1 to cross each layer of refrigerant flow channels 6, and a plurality of through holes 9 are arranged on the straight pipe 8, and the positions of the through holes 9 correspond to the positions of the refrigerant flow channels 6 of each layer, and the refrigerant flows uniformly into the refrigerant flow channels 6 of each layer through the through holes 9. The through holes 9 increase the flow velocity of the flow channel with a small flow velocity and reduce the flow velocity of the flow channel with a large flow velocity, thereby achieving uniform flow.

[0026] The refrigerant flow channel 6 and the coolant flow channel 7 are both composed of a stacked core plate 5. The refrigerant and the coolant are separated by the core plate 5. The core plate 5 is a metal core plate 5. The refrigerant and the coolant flow in the flow channel in opposite directions. The refrigerant and the coolant exchange heat through the core plate 5.

[0027] It has been verified that the number of layers of the traditional plate heat exchanger where the flow velocity of each layer is within ±20% of the average velocity of each layer accounts for 27.78% of the total number of layers, and the uniformity of the flow velocity between each layer is low. The number of layers of the plate heat exchanger in the utility model where the flow velocity of each layer is within ±20% of the average velocity of each layer accounts for 100% of the total number of layers, and the uniformity of the flow velocity is significantly improved. In addition, the total flow resistance of the traditional plate heat exchanger is 125KPa, while the total flow resistance of the plate heat exchanger in the utility model is 107KPa, which is significantly better than the traditional structure.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A plate heat exchanger with a flow-balanced structure, comprising a heat exchanger body formed by laminating core plates, wherein a plurality of refrigerant flow channels and coolant flow channels are arranged in the heat exchanger body in a layered manner; characterized in that: The heat exchanger body is provided with a refrigerant inlet, a refrigerant outlet, a coolant outlet, and a coolant inlet; one end of each layer of the refrigerant flow channel is connected to the refrigerant inlet, and the other end is connected to the refrigerant outlet; The refrigerant inlet is provided with a straight pipe that crosses each layer of refrigerant flow channels. The straight pipe is provided with a plurality of through holes. The positions of the through holes correspond to the positions of each layer of refrigerant flow channels. The refrigerant flows evenly into each layer of refrigerant flow channels through the through holes.

2. The plate heat exchanger with a flow-balanced structure according to claim 1, characterized in that: The refrigerant flow channel and the cooling liquid flow channel are both formed by stacking core plates. The refrigerant and the cooling liquid are separated by passing through the core plates, and heat exchange is performed through the core plates.

3. The plate heat exchanger with a flow-balanced structure according to claim 1, characterized in that: The core plate is a metal core plate.

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