KR100862809B1 - heat exchanger for high pressure condition - Google Patents

Abstract

The high-pressure heat exchanger according to the present invention is a high-pressure for the high-pressure refrigerant flows therein a plurality of tubes 34 are communicated between the two headers 36, 38 are arranged spaced parallel to each other and sealed at both ends. In the heat exchanger, the headers 36 and 38 include a first header pipe 42 having a refrigerant flow hole H1 formed therein and a first coupling plane 42a formed at one side thereof, and a refrigerant therein. And a second header pipe 44 having a flow hole H2 formed therein and having a second coupling plane 44a brazing in close contact with the first coupling plane 42a. 42 and 44 have a structure in which tube insertion holes 42b and 44b into which one side of the tube 34 is inserted, respectively, and the tube 34 has a plurality of refrigerant flow holes therein. 34a) is a microchannel tube with a simple structure, which improves processability for thick headers. It has the effect of injuring and increasing the pressure resistance and smoothly circulating the oil flowing into the system during operation.

Description

Heat exchanger for high pressure condition

1 is a perspective view showing an example of a header of a conventional high pressure heat exchanger;

2 is a configuration diagram showing a high pressure heat exchanger according to the present invention;

3 is an exploded perspective view showing a part of a header of a heat exchanger for high pressure according to the present invention;

4 is an assembly view of FIG. 3;

5 is a cross-sectional view of a tube assembled to the header of FIG. 4;

6 is a view showing an example (cutting process) of the processing method of the tube insertion hole of FIG.

7 is a view showing another example (press processing) of the tube insertion hole processing method of FIG.

8 is a sectional view of the tube of FIG. 5;

Figure 9 is a perspective view showing a state where the strength reinforcement bracket is coupled to the header of the high-pressure heat exchanger according to the present invention.

<Explanation of symbols for the main parts of the drawings>

34: tube 36, 38: header

42: first header pipe 42a: first coupling plane

44: second header pipe 44a: second coupling plane

42b, 44b: tube insertion hole 45: baffle

47: strength reinforcement bracket H1, H2: refrigerant flow hole

S3: Refrigerant communication space

The present invention relates to a header of a high pressure heat exchanger.

In general, a heat exchanger is a device in which a high temperature fluid and a low temperature fluid transfer heat from a high temperature to a low temperature through a heat exchanger wall surface to perform heat exchange. HFC refrigerant is mainly used as a working medium of an air conditioning system having such a heat exchanger as a component. Air conditioning systems using HFC refrigerants are cycled within a critical point of 5.4 MPa. Accordingly, the header is integrally extruded into a circle and a multi channel tube is used to withstand the operating pressure and to secure a flow path.

These HFC refrigerants are recognized as one of the main factors of global warming, and the regulations on their use are gradually being expanded. Under these circumstances, research on the next generation carbon dioxide refrigerant to replace the HFC refrigerant is being actively conducted.

Carbon dioxide, the representative of these next-generation refrigerants, has a global warming index (GWP) of about 1300th of HFC-R134a, and has a low compression ratio, which provides excellent compression efficiency and excellent heat transfer performance. Since the temperature difference between the inlet temperature of the air and the outlet temperature of the refrigerant can be much smaller than that of the conventional refrigerant, heat can be extracted even at low outside air temperature in winter. Therefore, the heat pump can be used for cooling in summer and heating in winter. Applicable, the volume cooling capacity (evaporative latent heat x gas density) is 7 ~ 8 times that of the conventional refrigerant R134a, which can greatly reduce the capacity of the compressor.The surface tension is small, so the boiling heat transfer is excellent, and the static pressure specific heat This large and low viscosity has excellent heat transfer performance and therefore has excellent thermodynamic properties as a refrigerant.

The high pressure heat exchanger using carbon dioxide as a refrigerant requires high pressure resistance because it operates at about 10 times higher pressure than the conventional HFC-R134a refrigerant heat exchanger, so the heat exchanger using various headers and micro multi-channel tubes with high pressure resistance is proposed. It is becoming.

Figure 1 shows the header 10 of the high-pressure heat exchanger to ensure the pressure resistance by increasing the thickness of the conventional material. As shown in the drawing, two header elements 12 and 14 are joined and welded so that flow paths R1 and R2 are formed therebetween, and a tube insertion hole in which a tube is inserted into one header element 12 is installed. 12a is formed, and the flow path R1 and the flow path R2 are divided by the thick partition walls 12b and 14b to increase the rigidity of the header 10.

On the other hand, as another embodiment of the header of the high-pressure heat exchanger, it may be produced by integrally extruding or drawing to form the flow path (R1, R2). The tube insertion hole formed in such an integrated high pressure heat exchanger header is formed by press working or electric discharge machining.

By the way, the header of the conventional high pressure heat exchanger has the shape of an integrated header through extrusion or drawing in order to secure reliability for high pressure. Because of this, there is a difficulty in processing the tube insertion hole through the press working due to the processing characteristics, and there is a problem that the manufacturing time and the processing cost increase during the discharge processing.

In addition, the conventional high pressure heat exchanger has a problem that the oil introduced during the system operation does not circulate smoothly and stays inside the heat exchanger.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a high-pressure heat exchanger having a simple structure and improving the processability for a thick header and increasing the pressure resistance.

Another object of the present invention is to provide a high pressure heat exchanger for smoothly circulating oil introduced during system operation.

In the high pressure heat exchanger according to the present invention, in the high pressure heat exchanger in which a plurality of tubes are communicated between two headers spaced in parallel with each other and closed at both ends, a high pressure refrigerant flows therein. A first header pipe having a coolant flow hole formed therein and having a first coupling plane formed on one side thereof, and a second header having a coolant flow hole formed therein and a second bonding plane brazed in close contact with the first joining plane. And a tube insertion hole into which one side portion of the tube is inserted at each one edge of each of the first and second header pipes, and the tube has a plurality of refrigerant flow holes formed therein. It is characterized in that.

The tube insertion hole communicates with the refrigerant flow holes formed in the first header pipe and the second header pipe and at the same time forms a lower end of the refrigerant flow hole at the end of the tube to form a refrigerant communication space in which the refrigerant entering and exiting the tube flows smoothly. It is dug up to noodles.

Each width of the first header pipe and the second header pipe is smaller than the width of the tube.

The tube insertion hole communicates with the first and second header pipes in close contact and brazing.

One of the two headers is provided with one baffle to be divided into a refrigerant inlet formed with a refrigerant inlet and a refrigerant outlet formed with a refrigerant outlet, and the refrigerant inlet and the refrigerant outlet are configured to facilitate the circulation of oil flowing during system operation. At each lower end of the coolant inlet and the coolant outlet, divided by the baffle, the coolant is formed within 1/5 of the length of the coolant inlet and within 1/5 of the length of the coolant outlet.

The baffle is installed at the center of the header length such that the length of the coolant inlet is the same as the length of the coolant outlet, and the baffle partitions the coolant inlet and the coolant outlet to form a coolant path.

The header having the coolant inlet and the coolant outlet is provided with a strength reinforcing bracket coupled to the location of the coolant inlet and the coolant outlet so as to reinforce rigidity and fix the header pipe.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a block diagram showing a high pressure heat exchanger to which the present invention is applied. As shown in the drawing, a plurality of tubes 34 including heat radiating fins 32 for radiating the refrigerant of the high temperature and high pressure compressed by the compressor are installed in parallel with each other and are installed at equal intervals, respectively, on both sides of the plurality of tubes 34. The headers 36 and 38 communicate with each other in an upright position, and one of the headers 36 and 38 is provided with a coolant inlet 38a and a coolant outlet 38b.

The header 38 is provided with one baffle 45 so as to be divided into a refrigerant inlet part in which the refrigerant inlet 38a is formed and a refrigerant outlet part in which the refrigerant outlet 38b is formed, and the refrigerant inlet 38a and the refrigerant outlet ( 38b) is within one fifth of the length L1 of the refrigerant inlet and the refrigerant outlet at each lower end of the refrigerant inlet and the refrigerant outlet divided by the baffle 45 to facilitate circulation of the oil flowing during system operation. It is formed within 1/5 of negative length L2, respectively.

The baffle 45 is provided at the center of the entire length of the header 38 so that the length L1 of the coolant inlet and the length L2 of the coolant outlet are the same. The baffle 45 divides the refrigerant inlet and the refrigerant outlet to form a refrigerant path. The baffle 45 also serves to reinforce the header pipe. Both ends of the headers 36 and 38 are blocked by the respective caps 37 and 39.

3 and 4 are an exploded perspective view and an assembled perspective view showing a part of a header of the high pressure heat exchanger according to the present invention. As shown in the drawing, the headers 36 and 38 have a first header pipe 42 having a refrigerant flow hole H1 formed therein and having a first coupling plane 42a formed at one side thereof. And a second header pipe (44) having a coolant flow hole (H2) formed therein and having a second joining plane (44a) brazed in close contact with the first joining plane (42a). Each side edge of the pipes 42 and 44 is formed with tube insertion holes 42b and 44b into which one side of the tube is inserted.

The first and second header pipes 42 and 44 are rectangular pipes, and the refrigerant flow holes H1 and H2 formed therein are circular holes or elliptical holes.

The tube insertion holes 42b and 44b are processed deep enough to allow the refrigerant to easily communicate between the two pipes as the first and second header pipes 42 and 44 are closely brazed. As shown in FIG. 2, the tube 34 is divided into a portion D1 into which the tube 34 is inserted and a portion D2 through which the refrigerant communicates. That is, the tube insertion holes 42b and 44b communicate with the refrigerant flow holes H1 and H2 formed in the first header pipe 42 and the second header pipe 44 and at the same time, the tube 34. The refrigerant flowing in and out is excavated from the end of the tube 34 to the lower end surface of the refrigerant flow holes H1 and H2 to form a refrigerant communication space (S3) flowing smoothly.

Each width W1 of the first header pipe 42 and the second header pipe 44 is smaller than the width W2 of the tube 34.

The tube insertion holes 42b and 44b communicate as the first and second header pipes 42 and 44 are brought into close contact with each other and brazed.

The tube insertion holes 42b and 44b are formed by cutting in diagonal directions at the edges of the first and second header pipes 42 and 44 as shown in FIG. 6, or as shown in FIG. As described above, it is formed by pressing by vertically at the corners of the first and second header pipes 42 and 44.

On the other hand, in the case of a high-pressure heat exchanger in which two rows of tubes are coupled, the tube insertion holes are formed in the middle of one surface of each of the first and second header pipes 42 and 44, respectively, to the respective refrigerant flow holes H1 and H2. In communication with each other, the tubes are joined in two rows in the width direction of the headers 36 and 38.

As shown in Fig. 8, the tube 34 is a micro channel tube having a plurality of refrigerant flow holes 34a formed therein.

In addition, the header 38 having the refrigerant inlet 38a and the refrigerant outlet 38b is provided with a strength reinforcing bracket 47 at positions of the refrigerant inlet and the refrigerant outlet to reinforce rigidity and fix the header pipes 42 and 44. Are combined. The strength reinforcing bracket 47 is to withstand the impact due to the pressure change received due to the inflow and outflow of the refrigerant. The strength reinforcing bracket 47 is installed to surround the outer circumferential surface of the header 38.

The present invention is not limited to the above embodiment and can be modified in various ways.

According to the high-pressure heat exchanger according to the present invention, the structure is simple, improves the processability and increase the pressure resistance for the thick header, there is an effect to smoothly circulate the oil flowing during the system operation.

Claims (7)

delete delete In a high pressure heat exchanger in which a plurality of tubes 34 are communicated between two headers 36 and 38, which are spaced apart in parallel to each other and are closed at both ends, and a high pressure refrigerant flows therein, The headers 36 and 38 include a first header pipe 42 having a refrigerant flow hole H1 formed therein and a first coupling plane 42a formed at one side thereof, and a refrigerant flow hole H2 therein. And a second header pipe 44 having a second coupling plane 44a formed in close contact with the first coupling plane 42a to be brazed. The first and second header pipes 42 and 44 At each one side edge of the tube 34 has a structure in which the tube insertion holes 42b and 44b are respectively inserted. The tube 34 is a micro channel tube having a plurality of refrigerant flow holes 34a formed therein, The tube insertion holes 42b and 44b communicate with the refrigerant flow holes H1 and H2 formed in the first header pipe 42 and the second header pipe 44 and simultaneously enter and exit the tube 34. The coolant flows from the end of the tube 34 to the lower end surface of the coolant flow holes H1 and H2 so as to form a coolant communication space S3 flowing smoothly. The width W1 of each of the first header pipe 42 and the second header pipe 44 is smaller than the width W2 of the tube 34. The method according to claim 3, The tube insertion hole (42b) (44b) is a high pressure heat exchanger, characterized in that the first and second header pipes (42) (44) are in communication with each other in close contact with the brazing. In a high pressure heat exchanger in which a plurality of tubes 34 are communicated between two headers 36 and 38, which are spaced apart in parallel to each other and are closed at both ends, and a high pressure refrigerant flows therein, The headers 36 and 38 include a first header pipe 42 having a refrigerant flow hole H1 formed therein and a first coupling plane 42a formed at one side thereof, and a refrigerant flow hole H2 therein. And a second header pipe 44 having a second coupling plane 44a formed in close contact with the first coupling plane 42a to be brazed. The first and second header pipes 42 and 44 At each one side edge of the tube 34 has a structure in which the tube insertion holes 42b and 44b are respectively inserted. The tube 34 is a micro channel tube having a plurality of refrigerant flow holes 34a formed therein, One of the two headers 36 and 38 is provided with one baffle 45 so as to be divided into a coolant inlet formed with the coolant inlet 38a and a coolant outlet formed with the coolant outlet 38b. The refrigerant inlet 38a and the refrigerant outlet 38b have a length of the refrigerant inlet at each lower end of the refrigerant inlet and the refrigerant outlet divided by the baffle 45 so as to smoothly circulate oil flowing during system operation. A heat exchanger for high pressure, which is formed within 1/5 of L1 and within 1/5 of the length L2 of the refrigerant outlet. The method according to claim 5, The heat exchanger for high pressure, characterized in that the baffle (45) is provided in the center of the length of the header (38) so that the length (L1) of the refrigerant inlet portion and the length (L2) of the refrigerant outlet portion. The method according to claim 5 or 6, The header 38 having the refrigerant inlet and the refrigerant outlet has a strength reinforcing bracket 47 coupled to the position of the refrigerant inlet and the refrigerant outlet to reinforce rigidity and fix the header pipe.

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