Supercooling condenser with liquid storage built-in plate heat exchange structure

Abstract

The invention relates to a supercooling condenser of a liquid storage built-in plate type heat exchange structure. The supercooling condenser comprises a front end plate, a front side plate, at least one plate exchange set, at least one flat-square-shaped high-pressure liquid storage tank, a rear end plate and a rear side plate. The front side plate is arranged on the inner side of the front end plate, the rear side plate is arranged on the inner side of the rear end plate, the plate exchange sets and the high-pressure liquid storage tank are clamped between the front side plate and the rear side plate, and the high-pressure liquid storage tank is arranged between the plate exchange sets or on the rear side of the last plate exchange set close to the rear side plate. A gaseous refrigerant inlet, a liquid refrigerant outlet, a cooling water inlet and a cooling water outlet are respectively formed in the two side end plates or one side end plate; a refrigerant inlet is formed in the upper portion, close to the corner or the lower portion, close to one side corner, of the high-pressure liquid storage tank, a refrigerant outlet is formed in the lower portion, close to the other side corner, of the high-pressure liquid storage tank, the refrigerant inlet of the high-pressure liquid storage tank is communicated with the refrigerant outlet of the plate exchange set on the front side, and the refrigerant outlet of the high-pressure liquid storage tank is communicated with the refrigerant inlet or the liquid refrigerant outlet of the plate exchange set on the rear side. The weight is reduced, and the reliability is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile air conditioners, and in particular relates to a subcooling condenser with a liquid storage built-in plate-type heat exchange structure. Background Art

[0002] In the context of environmental protection, indirect heat pump systems using R290 refrigerant have begun to be used in the automotive industry. R290 refrigerant is a natural working fluid and does not pose the risk of environmental prohibition; the thermophysical properties of R290 are very close to those of R22, which is conducive to low-cost replacement; R290 has good miscibility with most lubricants, which is conducive to the safe operation of the system.

[0003] The only disadvantage of R290 refrigerant is that it is flammable and explosive. In the refrigeration industry, indirect heat pumps are an important solution to reduce the amount of filling, improve safety, and construct comprehensive thermal management of the whole vehicle. The main components of the R290 indirect heat pump system are compressor, expansion valve, water-cooled (plate exchange) condenser, and water-cooled (plate exchange) evaporator. The compressor discharges the superheated refrigerant gas and enters the water-cooled (plate exchange) condenser to exchange heat with the cooling water and transfer the heat to the cooling water (antifreeze or oil and other heat transfer media can be used). The superheated refrigerant gas will first cool down to a two-phase state, and then the liquid phase will gradually increase until the gas phase refrigerant is completely converted into a liquid phase. The refrigerant will further cool down (supercooling), and the degree of supercooling will be different depending on the operating state and system design. Appropriately increasing the degree of supercooling is conducive to improving system performance. However, it is difficult for a simple plate heat exchanger to maintain supercooling stably.

[0004] In order to optimize system performance, many indirect systems add high-pressure liquid storage tanks. The high-pressure liquid storage tank has two main functions. The first is to store a part of the refrigerant to make the system more adaptable; the second is to provide gas-liquid separation to provide protection for the subsequent supercooling of the refrigerant.

[0005] The subcooling zone of the condenser is after the high-pressure liquid storage tank. The existing high-pressure liquid storage pipe is independently arranged in the heat pump system and needs to be connected to the condenser through a pipeline. As a result, the structure of the subcooling condenser is relatively complicated, and pipes are required to enter and exit a specific position of the high-pressure liquid storage tank, resulting in high cost, large space occupation, and chaotic piping.

[0006] Figure 5 It is the first generation product with an external high-pressure liquid storage tank. It has a confusing appearance and there are pipelines inside and outside. At the same time, the liquid storage tank must be fixed to the plate by fasteners or plastic clips. It is heavy, costly, and difficult to produce. The quality risk in each link is relatively large.

[0007] Figure 6It is the second generation product with external high-pressure liquid storage tank, which is relatively improved and has a much neater appearance. The liquid storage tank is welded, and the quality risk has been greatly reduced, but there are pipelines inside and outside, which are relatively fragile and easy to deform, scratch, corrode, etc., and the reliability and productivity are poor, which needs further improvement. Summary of the invention

[0008] In view of the above technical problems, the present invention proposes a subcooling condenser with a liquid storage built-in plate heat exchange structure which can reduce weight, save occupied space and reduce costs.

[0009] The above-mentioned object of the present invention is achieved by the following technical solutions:

[0010] A subcooling condenser with a liquid storage built-in plate heat exchange structure, the subcooling condenser adopts an integral brazing structure, including a front plate, a front side plate, at least one plate exchange group, at least one flat square high-pressure liquid storage tank, a rear plate and a rear side plate; the plate exchange group is composed of a plurality of superimposed heat exchange plates;

[0011] The front side plate is arranged on the inner side of the front side plate, the rear side plate is arranged on the inner side of the rear side plate, the plate exchange group and the high-pressure liquid storage tank are clamped and arranged between the front side plate and the rear side plate, and the high-pressure liquid storage tank is arranged between the plate exchange groups or on the rear side of the last plate exchange group close to the rear plate; gaseous refrigerant inlet, liquid refrigerant outlet, cooling water inlet and cooling water outlet are respectively arranged on the two side end plates or one side end plate;

[0012] A refrigerant inlet is arranged at a position near the corner at the top or one side corner at the bottom of the high-pressure liquid storage tank, and a refrigerant outlet is arranged at a position near the other side corner at the bottom of the high-pressure liquid storage tank. The refrigerant inlet of the high-pressure liquid storage tank is connected to the refrigerant outlet of a front group of plate exchange groups, and the refrigerant outlet of the high-pressure liquid storage tank is connected to the refrigerant inlet or liquid refrigerant outlet of a rear group of plate exchange groups.

[0013] The refrigerant input into the subcooling condenser through the gaseous refrigerant inlet passes through the refrigerant flow cavity and the high-pressure liquid storage tank in the plate exchange group, and is discharged through the liquid refrigerant outlet; the refrigerant input into the subcooling condenser through the cooling water inlet passes through the cooling water flow cavity in the plate exchange group, and is discharged through the cooling water outlet, realizing heat exchange in the plate exchange group.

[0014] Moreover, each group of high-pressure liquid storage tanks can adopt a single-layer cavity structure or a multi-layer cavity structure.

[0015] Moreover, for an indirect heat pump system with a filling amount of 200 g, the cavity volume of the high-pressure liquid storage tank is 50 to 100 mL.

[0016] Moreover, the plate replacement group adopts three groups, namely the first plate replacement group, the second plate replacement group and the third plate replacement group; the high-pressure liquid storage tank is a group, adopts a single-layer cavity structure, and is composed of a front tank plate and a rear tank plate that are buckled and connected; and an additional group of partitions is provided; the gaseous refrigerant inlet is arranged at the upper left position of the front end plate near the corner, the gaseous refrigerant inlet is arranged at the upper right position of the rear end plate near the corner, the cooling water inlet is arranged at the lower left position of the rear end plate near the corner, and the cooling water outlet is arranged at the upper left position of the rear end plate near the corner; the front side of the first plate replacement group is in contact with the front plate, the partition is arranged between the first plate replacement group and the second plate replacement group, and the high-pressure liquid storage tank is arranged between the second plate replacement group and the third plate replacement group; the rear side of the third plate replacement group is in contact with the rear plate.

[0017] Moreover, tie rod connection points are evenly arranged between the front tank plate and the rear tank plate.

[0018] The present invention has the advantages and positive effects:

[0019] The present invention adds a tank plate that is snap-fitted between the plate exchange groups of the supercooling condenser of the plate heat exchange structure, thereby forming a flat square high-pressure liquid storage tank inside the plate exchange, thereby realizing a built-in setting of the liquid storage, breaking through the conventional design idea of ​​separately arranging the high-pressure liquid storage tank outside and connecting it to the supercooling condenser through a pipeline, and realizing the integration of structure and function, which can greatly reduce the weight, improve the utilization rate of the space occupied by the air conditioner, and help reduce the space occupied by the heat pump system; in addition, the pipelines entering and exiting the liquid storage tank can be eliminated, which simplifies the structure, reduces the cost, avoids problems such as leakage at the connection of the pipe ends, and improves the reliability; it can also greatly improve the appearance, making the condenser and the heat pump system look simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1a is a schematic diagram of the overall appearance of an embodiment of the present invention from a front view angle;

[0021] Figure 1b is a schematic diagram of the overall appearance of an embodiment of the present invention from a rear-view angle;

[0022] Figure 1c is a side view of the overall appearance of an embodiment of the present invention;

[0023] Figure 2 is an exploded perspective view of Figure 1;

[0024] Figure 3a is a schematic diagram of the refrigerant flow direction of an embodiment of the present invention;

[0025] Figure 3b is a schematic diagram of the cooling water flow direction of an embodiment of the present invention;

[0026] Figure 4ais a rear plan view of an implementation of the present invention;

[0027] Figure 4b yes Figure 4a AA section view;

[0028] Figure 4c yes Figure 4a BB cross-sectional view;

[0029] Figure 5 This is a reference diagram of the first generation of products with an external high-pressure liquid storage tank.

[0030] Figure 6 This is a reference diagram of the second generation product with an existing external high pressure liquid storage tank. DETAILED DESCRIPTION

[0031] The structure of the present invention is further described below with reference to the accompanying drawings and by way of examples. It should be noted that the present examples are descriptive rather than restrictive.

[0032] A subcooling condenser with a plate heat exchange structure and built-in liquid storage, see Figure 1a-Figure 4c The invention point is: the subcooling condenser adopts an integral brazing structure, including a front plate 5, a front side plate 6, at least one plate exchange group 7, at least one flat square high-pressure liquid storage tank 9, a rear plate 11 and a rear side plate 10. The plate exchange group is composed of a plurality of heat exchange plates stacked together. The heat exchange plate adopts a stamped plate structure, referring to the existing wrench heat exchanger structure.

[0033] The front side plate is arranged on the inner side of the front side plate, the rear side plate is arranged on the inner side of the rear side plate, the plate changing group and the high pressure liquid storage tank are clamped and arranged between the front side plate and the rear side plate, and the high pressure liquid storage tank is arranged between the plate changing groups or on the rear side of the last plate changing group close to the rear plate. The gas refrigerant inlet 1, the liquid refrigerant outlet 4, the cooling water inlet 3, and the cooling water outlet 2 are arranged on the two side end plates or one side end plate respectively, and can be flexibly arranged according to the specific usage.

[0034] A refrigerant inlet 1 is provided at the upper part of the high-pressure liquid storage tank near the corner or the lower part near one side corner, and a refrigerant outlet 4 is provided at the lower part of the high-pressure liquid storage tank near the other side corner. The refrigerant inlet of the high-pressure liquid storage tank is connected to the refrigerant outlet of a front group of plate exchange groups, and the refrigerant outlet of the high-pressure liquid storage tank is connected to the refrigerant inlet or liquid refrigerant outlet of a rear group of plate exchange groups.

[0035] The refrigerant input into the subcooling condenser through the gaseous refrigerant inlet passes through the refrigerant flow cavity and the high-pressure liquid storage tank in the plate exchange group, and is discharged through the liquid refrigerant outlet; the refrigerant input into the subcooling condenser through the cooling water inlet passes through the cooling water flow cavity in the plate exchange group, and is discharged through the cooling water outlet, realizing heat exchange in the plate exchange group.

[0036] According to the specific usage, each group of high-pressure liquid storage tanks mentioned above can adopt a single-layer cavity structure or a multi-layer cavity structure. It is composed of two or more tank plates that are buckled and connected to form a cavity inside. The single-layer height and structural strength of the cavity should be designed according to technical and economic efficiency. In general, the single-layer height of the cavity should be as high as possible, and 4 to 6 mm is generally preferred. In order to ensure the structural strength, the tie rod connection points should be set as evenly as possible, and the connection points should minimize the occupation of the cavity space. Regarding the cross-sectional area of ​​the cavity, it needs to be adapted to the system circulation volume to ensure that the flow rate in the cavity can make the gas phase and liquid phase of the refrigerant stratified, with the liquid phase in the lower layer. Regarding the internal volume of the cavity, it is necessary to adapt to the system's requirements for the filling volume platform section. For conventional systems with an indirect heat pump system filling volume of about 200g, the preferred cavity internal volume is about 50 to 100mL.

[0037] In the present invention, the front plate, front side plate, rear plate and rear side plate constitute the outer shell, which is made of aluminum alloy. The plate exchange group, high pressure liquid storage tank and partition constitute the core body, and the plate exchange group generally adopts a commonly used plate exchange structure such as plate sheet type or plate fin type.

[0038] Example:

[0039] In this embodiment, the plate exchange group adopts three groups, namely the first plate exchange group 7.1, the second plate exchange group 7.2 and the third plate exchange group 7.3. The high-pressure liquid storage tank is a group and adopts a single-layer cavity structure, which is composed of a front tank plate 9.1 and a rear tank plate 9.2 that are buckled and connected. A group of partitions 8 is added. The partition is used to achieve the reversal of the flow of the refrigerant. The gaseous refrigerant inlet is arranged at the upper left position of the front plate near the corner, the gaseous refrigerant inlet is arranged at the upper right position of the rear plate near the corner, the cooling water inlet is arranged at the lower left position of the rear plate near the corner, and the cooling water outlet is arranged at the upper left position of the rear plate near the corner. The front side of the first plate exchange group contacts the front plate, the partition is arranged between the first plate exchange group and the second plate exchange group, and a high-pressure liquid storage tank is arranged between the second plate exchange group and the third plate exchange group. The rear side of the third plate exchange group contacts the rear plate.

[0040] The refrigerant flow channel and cooling water flow of this embodiment are as follows:

[0041] Refrigerant flow channel:

[0042] The superheated refrigerant enters the first plate exchange group through the gaseous refrigerant inlet and flows downward (as shown in Figure 3). The partition 4 plays a role in changing the direction. After passing through the partition 4, the refrigerant flows upward in the opposite direction through the second plate exchange group. After entering the liquid storage tank through the upper inlet of the liquid storage tank, the two-phase refrigerant flows downward, then enters the third plate exchange group structure and flows upward, and finally flows out from the refrigerant outlet.

[0043] Coolant channel:

[0044] The coolant enters the plate heat exchanger through the water inlet, circulates inside, and finally flows out from the cooling water outlet.

[0045] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A subcooling condenser with a liquid storage built-in plate heat exchange structure, characterized in that: The subcooling condenser adopts an integral brazing structure, including a front end plate, a front side plate, at least one plate exchange group, at least one flat square high-pressure liquid storage tank, a rear end plate and a rear side plate; the plate exchange group is composed of a plurality of heat exchange plates stacked together; The front side plate is arranged on the inner side of the front side plate, the rear side plate is arranged on the inner side of the rear side plate, the plate exchange group and the high-pressure liquid storage tank are clamped and arranged between the front side plate and the rear side plate, and the high-pressure liquid storage tank is arranged between the plate exchange groups or on the rear side of the last plate exchange group close to the rear plate; gaseous refrigerant inlet, liquid refrigerant outlet, cooling water inlet and cooling water outlet are respectively arranged on the two side end plates or one side end plate; A refrigerant inlet is provided at a position near a corner at the upper part of the high-pressure liquid storage tank or near a corner at the lower part of the high-pressure liquid storage tank, and a refrigerant outlet is provided at a position near another corner at the lower part of the high-pressure liquid storage tank. The refrigerant inlet of the high-pressure liquid storage tank is connected to the refrigerant outlet of a plate exchange group on the front side, and the refrigerant outlet of the high-pressure liquid storage tank is connected to the refrigerant inlet or liquid refrigerant outlet of a plate exchange group on the rear side; The refrigerant input into the subcooling condenser through the gaseous refrigerant inlet passes through the refrigerant flow cavity and the high-pressure liquid storage tank in the plate exchange group, and is discharged through the liquid refrigerant outlet; the refrigerant input into the subcooling condenser through the cooling water inlet passes through the cooling water flow cavity in the plate exchange group, and is discharged through the cooling water outlet, realizing heat exchange in the plate exchange group.

2. The subcooling condenser with a plate-type heat exchange structure having a liquid storage built-in according to claim 1 is characterized in that: Each group of high-pressure liquid storage tanks can adopt a single-layer cavity structure or a multi-layer cavity structure.

3. The subcooling condenser with a plate-type heat exchange structure having a liquid storage built-in according to claim 1 is characterized in that: For an indirect heat pump system with a filling amount of 200 g, the cavity volume of the high-pressure liquid storage tank is 50 to 100 mL.

4. The subcooling condenser with a plate-type heat exchange structure having a liquid storage built-in according to claim 1 is characterized in that: The plate replacement group adopts three groups, namely the first plate replacement group, the second plate replacement group and the third plate replacement group; the high-pressure liquid storage tank is a group, adopts a single-layer cavity structure, and is composed of a front tank plate and a rear tank plate that are buckled and connected; and an additional group of partitions are provided; the gaseous refrigerant inlet is arranged at the upper left position of the front end plate near the corner, the gaseous refrigerant inlet is arranged at the upper right position of the rear end plate near the corner, the cooling water inlet is arranged at the lower left position of the rear end plate near the corner, and the cooling water outlet is arranged at the upper left position of the rear end plate near the corner; the front side of the first plate replacement group is in contact with the front plate, the partition is arranged between the first plate replacement group and the second plate replacement group, and the high-pressure liquid storage tank is arranged between the second plate replacement group and the third plate replacement group; the rear side of the third plate replacement group is in contact with the rear plate.

5. The subcooling condenser with a plate-type heat exchange structure having a liquid storage built-in according to claim 1 is characterized in that: Tie rod connection points are evenly arranged between the front tank plate and the rear tank plate.

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