Water-cooling core body for R290 refrigerant system

Abstract

The invention discloses a water-cooling core body for an R290 refrigerant system, relates to the field of automobile air conditioner heat exchangers, aims to solve the problem that an existing cooling core body cannot be used for R290 refrigerants, and adopts the technical scheme that the water-cooling core body comprises two special-shaped collecting pipes with double cavities, in the two special-shaped collecting pipes, the two cavities of one special-shaped collecting pipe are mutually independent, and the two cavities of the other special-shaped collecting pipe are mutually independent. The two cavities of the other special-shaped collecting pipe are communicated through an overflowing hole, and the two cavities of the two special-shaped collecting pipes are communicated through two sets of sharp-corner harmonica-shaped pipes to form a U-shaped flow channel. The novel pipe joint structure can meet the requirements of refrigeration performance, low-temperature flow resistance and temperature uniformity at the same time by simultaneously adopting the double-layer, two-flow and double-cavity integrated special-shaped pipe with the drainage groove, the tapered circular overflowing hole and the sharp-corner harmonica-shaped pipe with the inner teeth. The drainage performance of condensate water on the surface of the water-cooling core body can be improved by adopting the special-shaped pipe with the drainage groove and the sharp-angled harmonica-shaped pipe. The structural design of the novel pipe joint can simplify the connection of a round pipe and a special-shaped pipe and save the cost.

Description

Technical Field

[0001] The invention relates to the technical field of automobile air-conditioning heat exchangers, in particular to a water-cooling core for an R290 refrigerant system. Background Art

[0002] With the increasing environmental protection requirements, it is urgent to replace the current high-GWP refrigerants with low-GWP refrigerants for automotive air-conditioning refrigerants. The industry focuses on the research of four alternative refrigerants: R1234yf, R744, R152a, and R290. Among them, due to the high price of R1234yf, the high cost of R744 high-pressure system, and the high GWP of R152a, R290 refrigerant has the most advantages in performance, cost, and GWP. However, R290 has certain flammability. At present, research has shown that this problem can be solved by increasing the heat exchange of the secondary water system loop, and a water-cooled core is required in the heat exchange of the secondary water system loop.

[0003] Existing water heat exchangers only have a warm air core, such as Figure 7 As shown in the figure, it adopts a 29mm single-layer parallel flow design. The manifold is made of two parts, the main board and the end cover, which are riveted together. The main board and the end cover are both stamped from sheet metal. The flat tube adopts a two-hole folded tube structure from sheet metal. The fins are conventional louver fins. During use, it is used for heating conditions, directly exchanging heat between the coolant and the air between the walls inside and outside the cooling core.

[0004] Because the application range of the manifold mold is narrow and the single-layer core has the disadvantage of poor temperature uniformity, if it is used directly as a water-cooled core, there will be problems such as poor drainage and bacterial growth without a special drainage structure. The flat tube adopts a two-hole folded tube structure of sheet material with a small number of holes and low heat exchange efficiency, which cannot meet the refrigeration needs of the entire vehicle. Therefore, the heater core cannot be directly used as a refrigeration condition for the secondary water circuit of the R290 refrigeration system.

[0005] Chinese patent CN203731746U discloses a parallel flow evaporator for a vehicle, which adopts the technical scheme of comprising an upper shunt pipe, a lower shunt pipe, a harmonica pipe connecting the upper shunt pipe and the lower shunt pipe, fins arranged between the harmonica pipes for heat exchange, and inlet and outlet inner and outer plates, wherein the inlet and outlet inner and outer plates constitute a closed inlet cavity and an outlet cavity; the upper shunt pipe comprises an upper shunt pipe body, wherein the upper shunt pipe body is provided with two independent cavities in the axial direction: a first shunt chamber and a second shunt chamber, the bottoms of the first shunt chamber and the second shunt chamber are evenly provided with harmonica pipe mounting holes, an upper shunt chamber parallel to the first shunt chamber and the second shunt chamber is further provided between the first shunt chamber and the second shunt chamber, and an upper flow hole connected to the first shunt chamber or the second shunt chamber is opened on one side of the upper shunt chamber.

[0006] If this prior art evaporator is directly used as a water-cooled core, its inlet and outlet channels are one large and one small. Since water is different from refrigerant, refrigerant has phase change, while water does not, there is a large flow resistance of low-temperature water. In addition, the inlet and outlet interfaces are structural interfaces of refrigerant R134A, and cannot be directly applied to the secondary water circuit system. Moreover, its manifold is a two-half buckled type, and the lower manifold has a total of 3 cavities. The small circular cavity in the middle will cause problems such as large flow resistance and poor performance. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the existing defects and provide a water-cooled core for an R290 refrigerant system, which is a water heat exchanger placed in the car in the secondary water circuit of the R290 refrigerant system for cooling the air, so that it can be used for cooling function in summer, which can effectively solve the problems in the background technology.

[0008] In order to achieve the above-mentioned purpose, the present invention discloses a water-cooled core for an R290 refrigerant system, and the technical scheme adopted is that it comprises a first special-shaped header and a second special-shaped header, the first special-shaped header comprises a first special-shaped tube upper cavity and a first special-shaped tube lower cavity, an intermediate rib plate is provided between the internal spaces of the two, and a flow hole is provided on the intermediate rib plate to connect the internal spaces of the two, the second special-shaped header comprises a second special-shaped tube upper cavity and a second special-shaped tube lower cavity, the internal spaces of the two are independent of each other, the first special-shaped tube upper cavity and the second special-shaped tube lower cavity are connected to each other, and ... The internal spaces of the upper cavity of the tube, the lower cavity of the first special-shaped tube and the lower cavity of the second special-shaped tube are connected through a group of sharp-angled harmonica tubes; the first special-shaped collecting tube and the second special-shaped collecting tube are also provided with drainage grooves, which can be used to guide the condensed water formed on the outer surface of the sharp-angled harmonica tube; one end of the upper cavity of the second special-shaped tube and the lower cavity of the second special-shaped tube are respectively connected to the outlet pipe and the inlet pipe, and the other end of the upper cavity of the second special-shaped tube and the lower cavity of the second special-shaped tube and the two ends of the first special-shaped collecting tube are connected to the conjoined partition. After the water enters the water inlet pipe, it first enters the first special-shaped collecting tube along a group of sharp-angled harmonica tubes, and after the cooling water enters the upper cavity of the first special-shaped tube from the lower cavity of the first special-shaped tube through the flow hole, it enters the upper cavity of the second special-shaped tube along the second group of sharp-angled harmonica tubes and leaves from the outlet pipe.

[0009] As a preferred technical solution of the present invention, connecting holes connecting the pointed harmonica tubes are provided on the sides of the first special-shaped collecting tube and the second special-shaped collecting tube, the pointed harmonica tubes have multiple layers, and the connecting holes are also correspondingly provided with multiple layers, and the drainage grooves are provided between two adjacent layers of connecting holes and are located on both sides of the side walls where the connecting holes are provided.

[0010] As a preferred technical solution of the present invention, the two ends of the pointed harmonica pipe are provided with pointed corners, and the inner wall of the long side plate connecting the two pointed corners is provided with internal teeth, which are fan-shaped block-shaped internal teeth. Since the water-cooling core is installed longitudinally, condensed water can be collected through the pointed corners to prevent it from being blown into the cab.

[0011] As a preferred technical solution of the present invention, the second special-shaped manifold is connected to the water inlet pipe and the water outlet pipe by a new type of pipe joint, and the new type of pipe joint is an integrated joint, which can reduce seams while ensuring a tight connection, thereby enhancing the overall strength of the equipment.

[0012] As a preferred technical solution of the present invention, the ports of the second special-shaped tube upper cavity and the second special-shaped tube lower cavity are D-shaped structures, the water inlet pipe and the water outlet pipe are round pipes, and the integrated joint is an integrated structure with a D-shaped pipe joint at the bottom and a round pipe joint at the top. The integrated joint can better transition between the cavity and the pipe.

[0013] As a preferred technical solution of the present invention, the flow holes are circular and distributed in plurality with the same spacing and gradually varying sizes, which can effectively solve the problem of uneven flow in the two processes and meet the flow resistance requirements. It also eliminates the need for additional components such as diverter plates, reduces the types and quantities of parts, and saves costs.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention can meet the requirements of refrigeration performance by adopting a double-layer, two-flow harmonica tube layout, the harmonica tube is divided into multiple flow channels, and the inner teeth of the fan-shaped block are arranged, which can meet the requirements of low flow resistance while ensuring the heat exchange effect, and the circular gradient flow holes opened on the middle rib plate can make the cooling water evenly enter the lower cavity of the first special-shaped tube from the upper cavity of the first special-shaped tube, and the drainage grooves on the special-shaped manifold and the sharp corners of the harmonica tube can guide the condensed water condensed on the surface of the harmonica tube during the cooling process to the drainage pipe for discharge, preventing the air flow entering the air conditioning box from blowing the condensed water into the cab. The special-shaped manifold is formed in one piece by stretching the profile, and a new type of pipe joint is used to connect the special-shaped manifold and the water inlet pipe and the drainage pipe, which can make the joint sealing better, simplify the connection between the special-shaped manifold and the water inlet pipe and the drainage pipe, and reduce the processing procedures of the special-shaped manifold, saving costs.

[0015] The present invention has efficient refrigeration performance, drainage performance, and temperature uniformity, and replaces the function and position of the evaporator in the current automobile R134a air-conditioning system, so that it can cool the interior of the car in summer, while meeting the industry development requirements of low GWP and maintaining low cost and high safety, which is in line with future development trends. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the first special-shaped header of the present invention; Figure 3 This is a schematic diagram of the internal structure of the first special-shaped header of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure of the sharp-angle harmonica pipe of the present invention; Figure 5 This is a schematic diagram of the integrated joint structure of the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the first special-shaped header of the present invention; Figure 7 It is a schematic diagram of the prior art structure.

[0017] In the figure: 1. first special-shaped collecting pipe; 101. upper cavity of first special-shaped tube; 102. lower cavity of first special-shaped tube; 103. drainage groove of first special-shaped tube; 104. flow hole; 105. middle rib plate; 2. second special-shaped collecting pipe; 201. upper cavity of second special-shaped tube; 202. lower cavity of second special-shaped tube; 203. drainage groove of second special-shaped tube; 3. sharp-angled harmonica tube; 301. sharp-angled part; 302. inner teeth; 4. new pipe joint; 401. integrated joint; 5. water inlet pipe; 6. water outlet pipe; 7. one-piece partition. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0019] like Figures 1 to 6 As shown, the present invention discloses a water-cooled core for an R290 refrigerant system, and the technical scheme adopted is, comprising a first special-shaped collecting pipe 1 and a second special-shaped collecting pipe 2, wherein the first special-shaped collecting pipe 1 comprises a first special-shaped tube upper cavity 101 and a first special-shaped tube lower cavity 102, both cavities are D-shaped tubular structures, the interiors of the two cavities are separated by an intermediate rib plate 105, and a flow hole 104 is opened on the intermediate rib plate 105, and both ends of the first special-shaped collecting pipe 1 are connected to a conjoined partition plate 7 to block the port.

[0020] The second special-shaped manifold 2 includes a second special-shaped tube upper cavity 201 and a second special-shaped tube lower cavity 202. Both cavities are D-shaped tubular structures and are independent of each other and not directly connected. The lower end of the second special-shaped manifold 2 is blocked by a conjoined partition 7. The first special-shaped manifold 1 and the second special-shaped manifold 2 are arranged in parallel with each other, and connecting holes are provided on the opposite surfaces. The connecting holes of the first special-shaped tube upper cavity 101 and the connecting holes of the second special-shaped tube upper cavity 201 are connected with the sharp-angled harmonica tubes 3 of group B, and the connecting holes of the first special-shaped tube lower cavity 102 and the connecting holes of the second special-shaped tube lower cavity 202 are connected with the sharp-angled harmonica tubes 3 of group A. The connecting holes and the sharp-angled harmonica tubes 3 are arranged in multiple rows and in parallel.

[0021] To prevent the air entering the air conditioning box from blowing condensed water into the cab, Figure 4 As shown, both ends of the sharp-angled harmonica pipe 3 are sharp corners 301, a first special-shaped pipe drainage groove 103 is opened at the transition of the adjacent surfaces facing both sides of the connecting hole of the first special-shaped header 1, and a second special-shaped pipe drainage groove 203 is opened at the transition of the adjacent surfaces facing both sides of the connecting hole of the second special-shaped header 2. The first special-shaped pipe drainage groove 103 and the second special-shaped pipe drainage groove 203 are arranged between two adjacent connecting holes.

[0022] In order to ensure heat exchange performance while having a smaller flow resistance, the sharp-angled harmonica tube 3 is divided into ten flow channels, and the inner teeth (302) of the fan-shaped blocks are arranged on the inner side of the outer plate connecting the sharp corners 301 at both ends.

[0023] Although Chinese patent CN207585414U (a sawtooth harmonica tube) discloses that inner teeth are arranged in the harmonica tube, the inner teeth of the prior art are too dense and sharp. If directly used as a water-cooling core, it will result in a small flow rate and a large flow resistance. Although Chinese patent CN201748836U (a harmonica tube for heat dissipation) has a lower inner tooth density, the square teeth it uses will also result in a small flow rate and a large flow resistance. In addition, the two prior arts have arcs at both ends and no water guiding structure, which is not convenient for the rapid discharge of condensed water. The pointed corner portion 301 of the present invention is conducive to the rapid flow of condensed water on the surface of the water-cooling core into the drain pipe, and the arc surface of the fan-shaped block inner teeth 302 in the 10 channels can ensure high efficiency in heat exchange performance while having a small flow resistance.

[0024] In order to make the cooling water evenly distributed in different sharp-angle harmonica pipes 3, such as Figure 3 As shown, the flow holes 104 are a row of circular holes with the same spacing and gradually changing sizes. The circular holes far from the inlet and outlet are the ones with larger apertures, and the circular holes near the inlet and outlet are the ones with smaller apertures.

[0025] In order to be able to import and export cooling water, the open port of the second special-shaped tube upper cavity 201 is connected to the water outlet pipe 6 through the new pipe joint 4, and the open port of the second special-shaped tube lower cavity 202 is connected to the water inlet pipe 5 through the new pipe joint 4. The new pipe joint 4 adopts an integrated joint 401, such as Figure 5 As shown, the integrated connector 401 includes an upper part and a lower part, the lower part is a D-type connector that matches the D-type cavity of the second special-shaped collecting pipe 2, and the upper part is a circular connector that matches the water inlet pipe 5 or the water outlet pipe 6. The D-type connector and the circular connector are integrally formed and interconnected.

[0026] Working principle of the present invention: The invention is installed in an air conditioning box, two special-shaped collecting pipes are arranged horizontally, the sharp-angle harmonica pipe 3 is arranged vertically, and a drain pipe is installed on the air conditioning box shell outside the cooling core to discharge condensed water.

[0027] The water after heat exchange with the R290 refrigerant enters the lower cavity 202 of the second special-shaped tube through the water inlet pipe 5, enters the sharp-angled harmonica tube 3 of group A from the connecting hole, flows along the sharp-angled harmonica tube 3 of group A into the lower cavity 102 of the first special-shaped tube, and then evenly enters the upper cavity 101 of the first special-shaped tube through the flow hole 104, enters the upper cavity 201 of the second special-shaped tube through the sharp-angled harmonica tube 3 of group B, and then leaves through the water outlet pipe 6.

[0028] When the cooling water passes through the pointed harmonica tubes 3 of group A and the pointed harmonica tubes 3 of group B, it exchanges heat with the air blown into the air-conditioning box from the outside, so that the air is cooled down. The cooled cold air enters the cab for cooling. In this process, water vapor in the air will form condensed water on the surface of the pointed harmonica tubes 3. The condensed water flows downward along the surface of the pointed harmonica tubes 3, and due to the guidance of the pointed portion 301 and the first special-shaped tube drainage groove 103 and the second special-shaped tube drainage groove 203, it enters the drainage pipe and is discharged outside, and will not be blown into the cab by the air entering the air-conditioning box.

[0029] The mechanical connection involved in the present invention is a common means used by those skilled in the art, and technical inspiration can be obtained through a limited number of tests, which is common knowledge.

[0030] Components not described in detail herein are prior art.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water-cooled core for an R290 refrigerant system, characterized in that: The invention comprises a first special-shaped collecting pipe (1) and a second special-shaped collecting pipe (2), wherein the first special-shaped collecting pipe (1) comprises a first special-shaped pipe upper cavity (101) and a first special-shaped pipe lower cavity (102), an intermediate rib plate (105) is provided between the internal spaces of the two, and a flow hole (104) is provided on the intermediate rib plate (105) to connect the internal spaces of the two, and the second special-shaped collecting pipe (2) comprises a second special-shaped pipe upper cavity (201) and a second special-shaped pipe lower cavity (202), the internal spaces of the two are independent of each other, and the internal spaces of the first special-shaped pipe upper cavity (101) and the second special-shaped pipe upper cavity (201) are connected to each other. The spaces between the first special-shaped tube lower cavity (102) and the second special-shaped tube lower cavity (202) are connected via a group of sharp-angled harmonica tubes (3); the first special-shaped collecting pipe (1) and the second special-shaped collecting pipe (2) are also provided with drainage grooves; one end of the second special-shaped tube upper cavity (201) and the second special-shaped tube lower cavity (202) are respectively connected to a water outlet pipe (6) and a water inlet pipe (5); the other ends of the second special-shaped tube upper cavity (201) and the second special-shaped tube lower cavity (202) and both ends of the first special-shaped collecting pipe (1) are connected to a conjoined partition plate (7).

2. The water-cooled core for the R290 refrigerant system according to claim 1, characterized in that: The side surfaces of the first special-shaped collecting pipe (1) and the second special-shaped collecting pipe (2) are provided with connecting holes connected to the pointed harmonica pipe (3); the pointed harmonica pipe (3) has multiple layers, and the connecting holes are also provided with multiple layers accordingly; the drainage groove is provided between two adjacent layers of connecting holes and is located on both sides of the side walls where the connecting holes are provided.

3. The water-cooled core for the R290 refrigerant system according to claim 1 or 2, characterized in that: Both ends of the pointed harmonica pipe (3) are provided with pointed corners (301), and the inner wall of the long side plate connecting the two pointed corners (301) is provided with inner teeth (302).

4. The water-cooled core for the R290 refrigerant system according to claim 3, characterized in that: The internal teeth (302) are fan-shaped block-shaped internal teeth.

5. The water-cooled core for the R290 refrigerant system according to claim 1, characterized in that: The second special-shaped manifold (2) and the water inlet pipe (5) and the water outlet pipe (6) are connected by a new type of pipe joint (4), and the new type of pipe joint (4) is an integrated joint (401).

6. The water-cooled core for the R290 refrigerant system according to claim 5, characterized in that: The ports of the second special-shaped tube upper cavity (201) and the second special-shaped tube lower cavity (202) are D-shaped structures, the water inlet pipe (5) and the water outlet pipe (6) are round pipes, and the integrated joint (401) is an integrated structure with a D-shaped pipe joint at the bottom and a round pipe joint at the top.

7. The water-cooled core for the R290 refrigerant system according to claim 1, characterized in that: The flow holes (104) are circular, distributed in plurality, and have a gradually varying aperture.

8. The water-cooled core for the R290 refrigerant system according to claim 1, characterized in that: The first special-shaped collecting pipe (1) and the second special-shaped collecting pipe (2) are integrally formed parts formed by stretching a profile.

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