KR20120139007A - Double-wall pipe type internal heat exchanger - Google Patents

Double-wall pipe type internal heat exchanger Download PDF

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Publication number
KR20120139007A
KR20120139007A KR1020110058504A KR20110058504A KR20120139007A KR 20120139007 A KR20120139007 A KR 20120139007A KR 1020110058504 A KR1020110058504 A KR 1020110058504A KR 20110058504 A KR20110058504 A KR 20110058504A KR 20120139007 A KR20120139007 A KR 20120139007A
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KR
South Korea
Prior art keywords
circumferential surface
fluid
tube
heat exchanger
pipe
Prior art date
Application number
KR1020110058504A
Other languages
Korean (ko)
Inventor
석경수
Original Assignee
주식회사 두원공조
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Application filed by 주식회사 두원공조 filed Critical 주식회사 두원공조
Priority to KR1020110058504A priority Critical patent/KR20120139007A/en
Publication of KR20120139007A publication Critical patent/KR20120139007A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00321—Heat exchangers for air-conditioning devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/06—Tubular elements of cross-section which is non-circular crimped or corrugated in cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles

Abstract

PURPOSE: An internal heat exchanger with double pipes is provided to with the improved efficiency of transferring heat to high temperature and pressure refrigerant flowing in an outer fluid path. CONSTITUTION: An internal heat exchanger with double pipes comprises an inner pipe(110), an outer pipe(120), a plurality of connecting ribs(130), and a unit for expanding a heat exchange area. An inner fluid path(111) for first fluid is formed in the inner pipe. An outer fluid path(121) for second fluid is formed in the outer pipe. The connecting ribs connect the outer surface of the inner pipe to the inner surface of the outer pipe. The unit for expanding a heat exchange area is formed on one of the inner and outer surfaces of the inner pipe. The unit for expanding a heat exchange area expands the heat exchange area between the first fluid and the second fluid.

Description

Double-wall pipe type internal heat exchanger

The present invention relates to an internal heat exchanger applied to a vehicle air conditioner, and more particularly, a refrigerant flowing along the flow path of the inner tube and the inner tube and the outer tube by combining an outer tube in a double tube structure on an outer side of the inner tube. It relates to a double-tube internal heat exchanger for mutual heat exchange between the refrigerant flowing along the flow path formed in the.

Generally, a refrigeration cycle applied to a vehicle air conditioner compresses a refrigerant by a compressor driven by an engine power and sends the refrigerant to a condenser. The refrigerant condenses the refrigerant by forced blowing of a cooling fan, and then expands the refrigerant. The valve and the evaporator are passed through in order to return to the compressor.

In the vehicle refrigeration cycle, a double tube heat exchanger or an internal heat exchanger for mutual heat exchange between the high pressure high temperature refrigerant at the outlet of the condenser and the low temperature low pressure refrigerant at the outlet of the evaporator is installed to improve the heat exchange efficiency.

Figure 1a is a block diagram of a refrigeration cycle for a vehicle to which the double tube internal heat exchanger as described above is shown.

Referring to the drawings, a refrigeration cycle for a vehicle to which a double tube internal heat exchanger is applied includes a compressor (1) driven by a driving force of an engine, a condenser (2) condensing refrigerant compressed by the compressor (1), and such a condenser An expansion valve (3) for throttling the refrigerant condensed in (2), an evaporator (4) for evaporating the refrigerant flowing from the expansion valve (3), a refrigerant at the outlet of the condenser (2) and the evaporator (4) ) And a double tube internal heat exchanger (5) which mutually heat exchanges the refrigerant at the outlet.

FIG. 1B shows the Moliere diagram of a refrigeration cycle to which the double tube internal heat exchanger 5 as described above is applied. In this case, the vertical axis represents pressure [ln (p)] and the horizontal axis represents enthalpy h. In addition, the refrigerant in the region on the left side of the liquid line represents the supercooled liquid state, the refrigerant in the region on the right side of the gas phase line represents a superheated gas phase state, and the refrigerant in the region between the liquid line and the gaseous line represents a gas-liquid mixed state.

Referring to the drawings, the AB process is a compression process in which the refrigerant is compressed to high temperature and high pressure in the compressor 1, the BC process is a cooling process in which the high temperature and high pressure refrigerant is cooled in the condenser 2, and the CD process is the cooled process. The refrigerant is throttled by the expansion valve 3 at low temperature and low pressure, and the DA process is an evaporation process in which the throttled refrigerant is evaporated by the evaporator 4.

In the above, the enthalpy difference from point D to point A corresponds to the amount of heat acting on the cooling, and as the enthalpy difference is larger, the refrigerating capacity is increased, so that the refrigerant at the outlet of the condenser 2 is discharged by the double tube internal heat exchanger 5. When the refrigerants at the outlet of the evaporator 4 are mutually heat exchanged, point C moves to point C1, point A moves to point A1, and the cooling capability is improved. At this time, the point C to the C1 point becomes the supercooling area to promote low temperature, and the point A to the A1 point becomes the superheating area to become a high temperature gas refrigerant.

The double-tube internal heat exchanger 5 as described above is installed in an air conditioner of a vehicle, and in recent years, the compactness of the air conditioner has been steadily required in keeping with the tendency of light and short reduction of the vehicle. There is a need for a dual tube internal heat exchanger structure that is either more compact or more compact and yet more compact.

The present invention has been created to meet the above needs, so that the air conditioner employing the internal heat exchanger can be implemented in a lighter and simpler, the structure is improved to reduce the length of the double pipe compared to the conventional on the basis of the same performance It is an object to provide a double tube internal heat exchanger.

According to the present invention, the inner tube is formed with an inner flow path flows; An outer tube which is inserted into and coupled to the inner tube to form an outer flow path through which a second fluid flows; A plurality of connecting ribs connecting the outer circumferential surface of the inner tube and the inner circumferential surface of the outer tube; And a heat exchange area expanding means provided on at least one of an inner circumferential surface and an outer circumferential surface of the inner tube to expand a heat exchange area between the first fluid and the second fluid.

The heat exchange area expansion means may be a serration formed on at least one of an inner circumferential surface and an outer circumferential surface of the inner tube.

In addition, the double tube internal heat exchanger, a pair of expansion pipe formed by expanding both ends of the inner tube; An inner circumferential surface connected to the outer circumferential surface of the expansion pipe portion and the outer pipe, respectively, in communication with the outer flow path, and a pair of connecting pipes formed with insertion holes on one side of the outer circumferential surface; A pair of internal connection pipes inserted into the expansion pipe and communicating with the internal flow paths; And a pair of external connection pipes inserted into the insertion holes of the connection pipe and communicating with the external flow path, the conversion flow paths of which the direction of the flow path is changed, formed inside. Here, the serration is preferably formed only in a section corresponding to the pair of connecting pipes.

In addition, the first fluid may be a gaseous refrigerant, and the second fluid may be a liquid refrigerant having a high temperature and high pressure than the first fluid.

Therefore, according to the double-tube internal heat exchanger according to the present invention, by forming a serration as an expansion means of the heat exchange area on the inner peripheral surface and / or the outer peripheral surface of the inner tube to increase the heat transfer area, low temperature low pressure flowing through the inner flow path of the inner tube It is possible to improve the heat transfer efficiency between the gas phase refrigerant of the high temperature and high pressure liquid refrigerant flowing through the external flow path formed between the inner tube and the outer tube.

As the heat exchange performance is improved as described above, in the double tube internal heat exchanger of the present invention, the length of the double tube can be reduced in comparison with the conventional one based on the same performance. Therefore, there is an advantage that the air conditioner employing such an internal heat exchanger can be implemented more lightly and simply.

1a is a block diagram of a refrigeration cycle for a vehicle to which a typical double tube internal heat exchanger is applied,
Figure 1b is a Moliere diagram of the refrigeration cycle shown in Figure 1,
2 is a perspective view of a double tube internal heat exchanger according to an embodiment of the present invention;
3 is a cross-sectional view taken along line III-III of FIG.
4 is a longitudinal sectional view taken along line IV-IV of FIG. 2;
5 is a longitudinal sectional view of a double tube internal heat exchanger according to another embodiment of the present invention.

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

2 is a perspective view of a double tube internal heat exchanger according to an embodiment of the present invention, FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2, and FIG. 4 is a longitudinal cross-sectional view taken along line IV-IV of FIG. 2. .

Referring to the drawings, the double tube internal heat exchanger 100 according to an embodiment of the present invention, the inner tube 110, the outer tube 120, a plurality of connecting ribs 130, heat exchange area expansion means 140.

An inner flow passage 111 through which the first fluid flows is formed in the inner pipe 110. Here, the first fluid flowing through the internal flow passage 111 may be, for example, a low-temperature low-pressure gas phase refrigerant coming from an outlet of the evaporator 4 (see FIG. 1) of the air conditioner.

The outer tube 120, the inner tube 110 is inserted into the inner coupling. Accordingly, the outer tube 120 forms an outer passage 121 through which a second fluid flows between the outer circumferential surface of the inner tube 110. Here, the second fluid flowing through the external flow passage 121 may be, for example, a high temperature and high pressure liquid refrigerant coming from an outlet of the condenser 2 (see FIG. 1) of the air conditioning apparatus.

As described above, in the double tube internal heat exchanger 100 provided in the internal heat exchanger for the air conditioner, the high pressure high temperature refrigerant at the outlet of the condenser 2 flowing through the external flow passage 121 and the evaporator 4 flowing through the internal flow passage 111 are provided. The low temperature low pressure refrigerant at the outlet exchanges with each other, thereby improving the refrigeration performance of the air conditioning apparatus.

The connecting ribs 130 connect the outer circumferential surface of the inner tube 110 and the inner circumferential surface of the outer tube 120, and a plurality of the connecting ribs 130 are arranged radially. The connecting rib 130 supports to maintain the gap between the inner tube 110 and the outer tube 120, thereby serving to maintain the structural rigidity of the double tube inner heat exchanger (100).

The heat exchange area expansion means 140 is provided on at least one of an inner circumferential surface and an outer circumferential surface of the inner tube 110 to expand a heat exchange area between the first fluid and the second fluid. The heat exchange area expansion means 140 will be described in detail with reference to the accompanying drawings.

2 to 4, the heat exchange area expansion means may be a serration (141) formed on the inner circumferential surface of the inner tube (110). The serration 141 is radially arranged such that the groove portion and the protrusion portion alternate on the inner circumferential surface of the inner tube 110, and is formed along the longitudinal direction of the inner tube 110. However, in FIG. 4, the serration 141 is illustrated as a screw thread. However, the serration 141 is illustrative, and the groove and the protrusion are alternately arranged, so that the inner circumferential surface area of the inner tube 110 may be expanded. It should be interpreted as being included in the scope of the invention.

As shown in FIG. 3, when the double tube internal heat exchanger 100 is manufactured, an expansion tube 112 is formed by expanding an inner circumferential surface by a predetermined length of both ends of the inner tube 110. Then, the internal connection pipe 152 is inserted into the expansion pipe 112 formed as described above. Therefore, the height of the protrusion (mountain) of the serration 141 should be such that the airtightness can be sufficiently maintained when the internal connection pipe 152 is inserted into the expansion pipe 112.

The serration 141 formed on the inner circumferential surface of the inner tube 110 increases the heat transfer area, thereby allowing the first fluid, the inner tube 110, and the outer tube 120 to flow through the inner channel 111 of the inner tube 110. An external flow path 121 formed between the second fluid may improve the heat transfer efficiency between the second fluid.

5 is a longitudinal cross-sectional view of a double tube internal heat exchanger according to another embodiment of the present invention. Here, the same reference numerals as those shown in FIGS. 2 to 4 are the same members having the same configuration and function, and thus repeated descriptions thereof will be omitted.

Referring to the drawings, the heat exchange area expansion means 140 of the double-tube internal heat exchanger 100 according to another embodiment of the present invention, as well as the serration 141 formed on the inner peripheral surface of the inner tube 110, The serration 142 is also formed on the outer circumferential surface of the inner tube 110.

By forming the serration 142 on the inner circumferential surface as well as the outer circumferential surface of the inner tube 110 to increase the heat transfer area, the first fluid and the inner tube 110 and the outer tube 110 flowing through the inner passage 111 of the inner tube 110. The external passage 121 formed between the pipes 120 may further improve the heat transfer efficiency between the second fluids.

In FIG. 5, as the heat exchange area expansion means 140, serrations 141 and 142 are formed on the inner and outer circumferential surfaces of the inner tube 110, respectively, but the serration 142 is formed only on the outer circumferential surface of the inner tube 110. This may be formed.

Meanwhile, the double tube internal heat exchanger 100 according to the embodiment of the present invention, as shown in FIGS. 2 and 3, is provided with both ends of the inner tube 110, respectively, and a pair of expansion tubes 112 is provided. ), A pair of connecting pipes 151, a pair of internal connecting pipes 152, and a pair of external connecting pipes 153 may be further included.

The expansion tube 112 is formed by expanding the inner peripheral surface of both ends of the inner tube (110).

The connecting pipe 151, the inner circumferential surface thereof is connected to the outer circumferential surface of the expansion pipe part 112 and the outer pipe 120, respectively. And the inner side of the connecting pipe 151 is in communication with the outer passage 121, the insertion hole is formed on one side of the outer peripheral surface.

The internal connection pipe 152 is inserted into the expansion pipe 112 and communicates with the internal flow path 111. One of the pair of internally connected pipes 152 flows into the low-temperature low-pressure refrigerant (first fluid) from the outlet of the evaporator 4 and flows through the other internally connected pipes 152 through heat exchange. The first fluid can flow toward the inlet of the compressor 1.

The external connection pipe 153 is inserted into the insertion hole of the connection pipe 151. In addition, the inside of the external connection pipe 153 is formed with a switching channel 154 in which the direction of the channel is switched while communicating with the external channel 121. One of the pair of externally connected pipes 153 flows through a high-temperature, high-pressure refrigerant (second fluid) from the outlet of the condenser 2, and the conversion path 154 formed in the other externally connected pipe 153. The refrigerant (second fluid), which has undergone heat exchange, may flow toward the inlet of the expansion valve 3.

In the structure of the double-tube internal heat exchanger 100 as described above, the serration (140; 141, 142) is preferably formed only in the section (L) corresponding between the pair of connecting pipes (151). This is because heat exchange is substantially performed between the first fluid and the second fluid only in the section L corresponding to the pair of connecting pipes 151.

As described above, in the double-pipe internal heat exchanger according to the embodiment of the present invention, by forming a serration as an expansion means of the heat exchange area on the inner circumferential surface and / or the outer circumferential surface of the inner tube to increase the heat transfer area, It can improve performance. Therefore, in the double tube internal heat exchanger of the present invention, the length of the double tube can be reduced compared to the conventional one on the basis of the same performance, and accordingly, the air conditioner employing such an internal heat exchanger can be lighter and simpler. .

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: double tube internal heat exchanger 110: inner tube
111: internal passage 112: expansion pipe
120: external pipe 121: external flow path
130: connection rib 140 (141, 142): serration
151: connector 152: internal connection pipe
153: external connection pipe 154: switching channel

Claims (5)

An inner tube having an inner flow path through which the first fluid flows;
An outer tube which is inserted into and coupled to the inner tube to form an outer flow path through which a second fluid flows;
A plurality of connecting ribs connecting the outer circumferential surface of the inner tube and the inner circumferential surface of the outer tube; And
And a heat exchange area expanding means provided on at least one of an inner circumferential surface and an outer circumferential surface of the inner tube to expand a heat exchange area between the first fluid and the second fluid.
The method according to claim 1,
The heat exchange area expansion means,
And a serration formed on at least one of an inner circumferential surface and an outer circumferential surface of the inner tube.
The method according to claim 2,
A pair of expansion pipes formed by expanding both ends of the inner pipe;
An inner circumferential surface connected to the outer circumferential surface of the expansion pipe portion and the outer pipe, respectively, in communication with the outer flow path, and a pair of connecting pipes formed with insertion holes on one side of the outer circumferential surface;
A pair of internal connection pipes inserted into the expansion pipe and communicating with the internal flow paths; And
And a pair of external connection pipes inserted into the insertion holes of the connection pipe, the conversion flow paths being in communication with the external flow paths and having a changed flow path formed therein.
The method according to claim 3,
The serration is a double tube internal heat exchanger formed only in a section corresponding between the pair of connecting pipes.
The method according to any one of claims 1 to 4,
The first fluid is a gaseous refrigerant,
The second fluid is a double-tube internal heat exchanger is a liquid refrigerant of a higher temperature and higher pressure than the first fluid.
KR1020110058504A 2011-06-16 2011-06-16 Double-wall pipe type internal heat exchanger KR20120139007A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110058504A KR20120139007A (en) 2011-06-16 2011-06-16 Double-wall pipe type internal heat exchanger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110058504A KR20120139007A (en) 2011-06-16 2011-06-16 Double-wall pipe type internal heat exchanger

Publications (1)

Publication Number Publication Date
KR20120139007A true KR20120139007A (en) 2012-12-27

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KR1020110058504A KR20120139007A (en) 2011-06-16 2011-06-16 Double-wall pipe type internal heat exchanger

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Country Link
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105066743A (en) * 2015-08-17 2015-11-18 芜湖通和汽车管路***股份有限公司 Heat exchanging air-conditioning pipeline for vehicle
US20210278137A1 (en) * 2020-03-03 2021-09-09 Daikin Applied Americas, Inc. System and Method for Manufacturing and Operating a Coaxial Tube Heat Exchanger
US20220297530A1 (en) * 2021-03-22 2022-09-22 Honda Motor Co., Ltd. Duct Surface Heat Exchanger for Vehicles
US11981195B2 (en) * 2021-03-22 2024-05-14 Honda Motor Co., Ltd. Duct surface heat exchanger for vehicles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105066743A (en) * 2015-08-17 2015-11-18 芜湖通和汽车管路***股份有限公司 Heat exchanging air-conditioning pipeline for vehicle
US20210278137A1 (en) * 2020-03-03 2021-09-09 Daikin Applied Americas, Inc. System and Method for Manufacturing and Operating a Coaxial Tube Heat Exchanger
US20220297530A1 (en) * 2021-03-22 2022-09-22 Honda Motor Co., Ltd. Duct Surface Heat Exchanger for Vehicles
US11981195B2 (en) * 2021-03-22 2024-05-14 Honda Motor Co., Ltd. Duct surface heat exchanger for vehicles

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