JP3300192B2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for exchanging heat between a first heat medium and a second heat medium in a non-contact state.

[0002]

2. Description of the Related Art As a heat exchanger for exchanging heat between two heat media, for example, a refrigerant and water in a non-contact state, there is a double tube type heat exchanger. This double-pipe heat exchanger performs heat exchange between the refrigerant and water by causing water to flow through the inner pipe and flowing the refrigerant between the inner pipe and the outer pipe.

[0003]

The only way to increase the heat transfer area in the above-described double-pipe heat exchanger is to increase the total length of the double-pipe section. Due to the fact that the heat exchanger is generally used, the heat exchanger itself tends to be large and heavy, which causes a problem that the installation place is restricted. The problem of the large size can be somewhat improved by bending the double pipe portion, but on the contrary, there is a problem that the flow resistance increases due to the collapse of the pipe due to the bending, and the performance is reduced.

[0004] The present invention has been made in view of the above problems, and an object of the present invention is to provide a heat exchanger that can easily secure a heat transfer area and can be easily reduced in size.

[0005]

Means for Solving the Problems In order to achieve the above object, an invention according to claim 1 is a heat exchanger for exchanging heat between a first heat medium and a second heat medium in a non-contact state. A pair of parallel first header pipes, and both ends connected to the first header pipe and forming a passage parallel to the tubes between adjacent tubes in a connected state by outer wall portions provided on widthwise side edges. Are parallel tubes,
A pair of second header pipes that are arranged outside the first header pipe and form a space that communicates with the inter-tube passage between the first header pipe and the first header pipe. A passage for the first heat medium is constituted by the passage in the tube, and a passage for the second heat medium is constituted by the space between the pair of pipes and the passages between the plurality of tubes. .

According to a second aspect of the present invention, in the heat exchanger according to the first aspect, a partition wall is provided in at least one of the pipe inner spaces so that the flow path for the first heat medium is meandering.
A partition wall is provided in at least one of the inter-pipe spaces so that the flow path for the second heat medium similarly meanders.

According to a third aspect of the present invention, in the heat exchanger according to the first or second aspect, the flow direction of the first heat medium in the tube passage is opposite to the flow direction of the second heat medium in the tube passage. As in the first header pipe
An inlet and an outlet for the heat medium are provided, and an inlet and an outlet for the second heat medium are provided in the second header pipe.

According to a fourth aspect of the present invention, in the heat exchanger according to any one of the first to third aspects, a spout for a second heat medium is provided in one of the second header pipes, and the spout is provided under bias of a spring. The spout is provided with a cap provided with a valve capable of closing the spout.

A fifth aspect of the present invention is characterized in that a passage for recovering the overflow of the second heat medium of the heat exchanger according to any one of the first to fourth aspects is provided at the spout.

[0010]

According to the first aspect of the present invention, the space in the pair of first header pipes and the passages in the plurality of tubes connected thereto constitute a flow path for the first heat medium.
A pair of spaces formed between the header pipe and the second header pipe, and a plurality of passages formed between adjacent tubes in a tube-connected state by an outer wall portion provided on the widthwise side edge of the tube. A flow path for the heat medium is configured. Since the passage for the second heat medium is formed in parallel with the tube by using the gap between the adjacent tubes, a sufficient heat transfer area can be secured even if the heat exchanger itself is downsized.

According to the second aspect of the invention, the flow path of the first heat medium and the flow path of the second heat medium can be meandered in the same manner by the partition wall provided in the space inside the pipe and the partition wall provided in the space between the pipes. A large flow path length can be secured in a small space. Other functions are the same as those of the first aspect.

According to the third aspect of the present invention, the inlet and the outlet are determined such that the flow direction of the first heat medium in the passage in the tube and the flow direction of the second heat medium in the passage between the tubes face each other. Therefore, heat exchange between the first heat medium and the second heat medium can be performed with high efficiency. Other operations are the same as those of the first and second aspects of the present invention.

According to the fourth aspect of the invention, the supply of the second heat medium can be performed through the spout, and the gas in the flow path of the second heat medium can be automatically vented by opening the valve by gas pressure. it can. Other functions and effects are described in claims 1 to 3.
It is the same as the invention of the above.

According to the fifth aspect of the present invention, the overflow of the second heat medium can be recovered through the passage provided in the spout. Other operations are the same as those of the first to fourth aspects.

[0015]

FIG. 1 to FIG. 8 show a first embodiment of the present invention. FIG. 1 is a perspective view of a heat exchanger, and FIG. 2 is a heat exchanger shown in FIG. FIG. 3 is a partially exploded side view of the heat exchanger excluding the second header pipe, FIG. 4A is a cross-sectional view showing a partition wall structure of a space in the pipe, and FIG. FIG. 5A is a partial perspective view of a tube, showing a modification of the partition wall structure, FIG. 5A is a partial perspective view of the tube, and FIG.
FIG. 6 is a sectional view taken along the line BB of FIG. 3, and FIG.
7 is a cross-sectional view taken along line CC of FIG. 1, FIG. 7B is a partially exploded view of FIG. 7A, and FIG. 8 is a view showing flows of a first heat medium and a second heat medium.

The heat exchanger of the present embodiment includes a pair of first header pipes 1, a plurality of (eight in the figure) tubes 11 having both ends connected to the first header pipe 1, a first heat medium. And a pair of second header pipes 31 surrounding each first header pipe 1, and an inlet pipe 41 and an outlet pipe 42 for the second heat medium. In this heat exchanger, all the components are made of aluminum or an alloy thereof, and all connection points and contact points between the components are brazed.

As shown in FIGS. 2 and 3, the first header pipe 1 comprises a cylindrical pipe body 2 and a cover plate 3 for closing the upper and lower openings of the pipe body 2. Holes 2a for connecting tubes are formed in the pipe body 2 at equal intervals in the vertical direction, and holes 2b for connecting inlet pipes and holes 2b for connecting outlet pipes are provided at upper and lower positions of one header pipe 2, respectively. Is formed. In addition, a partition wall 4 that partitions the space inside the pipe up and down is provided in one pipe main body 2.

As shown in FIG. 4 (a), the partition wall 4 has a hole 2c having a width corresponding to the inside diameter of the pipe at a predetermined position of the pipe main body 2, and a tip curvature matching the inside diameter of the pipe in the hole 2c. Is formed by inserting a wall plate P1 having Incidentally, as shown in FIG. 4 (b), the partition wall 4 uses a pipe body 2 which is vertically divided at a partition wall forming portion as a pipe main body 2, and has a center corresponding to the pipe inner diameter between both divided pipe members. It can also be formed by interposing a wall plate P2 having a thick portion.

The tube 11 has a flat shape as shown in FIGS. 5 (a) and 5 (b), and a plurality of (five in the figure) independent passages 11a are juxtaposed inside. At both ends of each tube 11, a notch portion 11b having a depth corresponding to the thickness of an outer wall portion 11c to be described later is formed longer than an insertion margin into the first header pipe 1. further,
A pair of outer wall portions 11c having a height corresponding to the tube interval in the connected state are integrally formed on both side edges in the width direction of each tube 11 except for the uppermost portion along the side edges.
Of course, the one having the outer wall portion 11c is
It may be used as 1.

As shown in FIG. 6, each of the tubes 11 is connected by inserting both ends having notches 11b into side holes 2a of the first header pipe 1. The portion 11c abuts on the upper tube 11, and as shown in FIG. 5B, the gap between the adjacent tubes 11 is closed by a pair of outer wall portions 11c. A passage K1 having a shape is formed. Further, since the length of the notch 11b is larger than the insertion distance of the tube, a plurality of (seven in the figure) passages K are provided.
1 is open at both ends.

An inlet pipe 21 and an outlet pipe 22 for the first heat medium
Has male screw portions 21a and 22a at one end, respectively.
The other ends of the inlet pipe 21 and the outlet pipe 22 are inserted into the side holes 2b of the first header pipe 1 and connected.

As shown in FIGS. 1 and 2, the second header pipe 31 is composed of a pair of split pipe members 32 having a semicircular cross section having a larger curvature than the first header pipe 1, and a cylindrical member of the split pipe member 32. And a lid plate 33 for closing the upper and lower openings of the combination. On one side edge of each split pipe member 32,
A notch 32a having a depth corresponding to a half of the width of the tube 11 is formed in a vertical direction with a size corresponding to the height of the entire tube 11. Each split pipe member 32 on the side corresponding to the inlet pipe 21 and the outlet pipe 22 for the first heat medium.
On the other side edge, a substantially semicircular notch 32b having a curvature corresponding to the outer diameter of the base of the inlet pipe 21 and the outlet pipe 22 is formed in a corresponding positional relationship.

Furthermore, a partition wall 34 having an upper surface shape as shown in FIG. 7B is provided on the inner surface of each split pipe member 32 on the side corresponding to the inlet pipe 21 and the outlet pipe 22 for the first heat medium. Are provided integrally or separately corresponding to the position of the partition wall 4. This partition wall 34 has a pipe holder 3 having a curvature corresponding to the outer diameter of the first header pipe 1.
4a at its center and the first header pipe 1
And a tube contact portion 34b conforming to the shape of the notch portion 11b of the tube 11 inserted and connected to the outer wall portion 11c, and the tube contact portion 34b connected to the pipe holding portion 34a.

Further, one of the split pipe members 32 corresponding to the inlet pipe 21 and the outlet pipe 22 for the first heat medium has a hole 32c for connecting the inlet pipe and a hole 32c for connecting the outlet pipe.
Are formed respectively.

The second header pipe 31 is brought into contact with a pair of split pipe members 32 such that the first header pipe 1 enters the inside thereof and the entire tube 11 enters the notch 32a. The lid plate 33 is fitted into openings formed on the upper and lower sides, and the contact portions are brazed and joined to form a header pipe. Second header pipe 31
FIG. 7 shows a state in which the components constituting
As shown in (a), an annular space K2 is formed between the second header pipe 31 and the first header pipe 1. Since the space K2 includes the connection end of each tube 11, the passage K1 formed between the tubes 11 is
Communicate with 2 respectively. Further, both partition walls 34 abut via the connection end portions of the first header pipe 1 and the tube 11, whereby the space K2 is vertically divided by the partition walls 34.

An inlet pipe 41 and an outlet pipe 42 for the second heat medium
Is formed of a cylindrical pipe material, and one end is inserted and connected to a side hole 32c of the split pipe material 32 constituting the second header pipe 31.

In the above heat exchanger, a space in the pair of first header pipes 1 and a passage in a plurality of tubes 11 communicating therewith constitute a first heat medium, for example, a flow path for a refrigerant. As shown by the dashed arrow in FIG. 8, the refrigerant flowing into the inlet pipe 21 flows into the upper five tube passages from the upper space of the one pipe inner space, and passes through these passages in the other first header pipe 1. Flow into space. The refrigerant flowing into the other pipe space flows into the lower three tube passages, flows into the lower space of the one pipe space through these passages, and flows out of the outlet pipe 22.

Further, the above heat exchanger has a space K formed between the first header pipe 1 and the second header pipe 11.
The second heat medium, for example, a flow path for water is constituted by the passage K1 between the tube 2 and the tube 11 communicating therewith. As shown by the solid arrows in FIG. 8, the water that has flowed into the inlet pipe 41 flows from the lower space of one inter-pipe space K2 into the lower four inter-tube passages K1, and through these passages K1, the other inter-pipe space. Flow into K2. The water flowing into the other inter-pipe space K2 flows into the upper five inter-tube passages K1, and passes through the one inter-pipe space K1 through these passages K1.
2 and flows out of the outlet pipe 14.

According to the heat exchanger of this embodiment, the passage K1 for the second heat medium parallel to the tube 11 is formed by utilizing the gap between the adjacent tubes 11, so that the heat exchanger itself can be used. Even if the size is reduced, a sufficient heat transfer area can be ensured, thereby providing a heat exchanger that can easily secure the heat transfer area and easily reduce the size.

Further, since all the constituent parts are made of aluminum, the heat exchanger itself is extremely lightweight, and since the parts can be connected together by brazing, the assembling work can be simplified.

Further, the partition wall 4 provided in the space in the pipe
And the partition wall 34 provided in the space K2 between the pipes.
Since the flow path of the heat medium and the flow path of the second heat medium can be meandered in the same manner, a large flow path length can be secured in a small space to improve the heat exchange performance, and the number of tubes 11 and each partition Only by increasing the number of walls 4 and 34 can the flow path form be easily changed and the heat transfer area can be increased.

Further, the first passage in the passage in the tube is provided.
The flow direction of the heat medium and the second
Since the respective inlets and outlets are determined so that the flow directions of the heat medium are opposed to each other, the first heat medium and the second heat medium can exchange heat with high efficiency, thereby contributing to performance improvement.

In order to equalize the opening dimensions of the inter-tube passage K1 at the tube connection end, a notch 11b of the tube 11 is provided with a step defining the dimension of insertion of the tube 11 into the first header pipe 1. It may be.

FIG. 9 (a)
(E) can be substituted respectively. The tube 51 shown in FIG. 5A has a plurality of passages 51a therein, a pair of outer walls 51b on both side edges in the width direction, and a pair of outer walls 51b between the outer walls which are parallel to each other at the same height as the outer walls 51b. The two inner wall portions 51c are provided, and the passage between tubes can be divided in the width direction by the inner wall portions 51c. The tube 52 shown in FIG. 5B has a plurality of passages 52a therein and a pair of outer wall portions 52b extending vertically at both side edges in the width direction. The tube 53 shown in FIG. 3C has a plurality of passages 53a therein, a pair of outer wall portions 53b extending vertically on both side edges in the width direction, and a space between the outer wall portions at the same height as the outer wall portion 53b. Two parallel inner wall portions 53c are provided, and the passage between tubes can be divided in the width direction by the inner wall portions 53c of both tubes. The tube 54 shown in FIG. 3D has a plurality of passages 54a therein and a pair of outer wall portions 5 whose directions are vertically different on both side edges in the width direction.
4b. Tube 55 shown in FIG.
Is provided with a plurality of passages 55a therein, a pair of outer wall portions 55b whose directions are vertically different on both side edges in the width direction, and an inner wall portion 55c having the same height as the outer wall portion 54b in parallel with the pair of outer wall portions 55b.
And the passage between tubes can be divided in the width direction by the inner wall portions 53c of both the tubes.

[Second Embodiment] FIGS. 10 and 11 show a second embodiment of the present invention. FIG. 10 is a perspective view of a heat exchanger, and FIG. 11 is a sectional view taken along the line DD of FIG. FIG.

The heat exchanger of the present embodiment is characterized in that a spout 61 for the second heat medium is provided at the end of the second header pipe;
This embodiment differs from the first embodiment in that an opening / closing cap 62 is provided at the spout 61. The other configuration is the same as that of the first embodiment, so the same reference numerals are used and the description is omitted.

The spout 61 is made of aluminum and has a cylindrical shape having flanges 61a and 61b at upper and lower positions as shown in FIG. The spout 61 also serves as a cover plate, and the lower flange 61b is fitted into the upper opening of the second header pipe 31 and connected by brazing. The spout 61
An overflow pipe 61c for recovering the overflow of the second heat medium is connected to the side surface of. Further, the upper flange 61a is formed with a notch 61d into which an engagement protrusion 62e of the opening / closing cap 62 described later can be inserted.

The opening / closing cap 62 is a vertically movable valve 62.
a, a coil spring 62b for urging the same downward, a gasket 62c, and a cap body 62d. An engagement projection 62e is provided on the lower surface of the cap body 62d.

When attaching the opening / closing cap 62 to the spout 61, the valve 62a is inserted into the spout 61, and the valve 6
Inserting the engaging projection 62e into the notch 61d of the spout 61 while pushing the cap body 62d against the urging force of the coil spring 62b in a state where the 2a is pressed against the inner surface step 61e of the spout 61, If you release the hand after rotating the cap body 62d,
The cap body 62d is raised by the urging force of the coil spring 62b, and the engagement projection 62b is moved upward by the upper flange 61a of the spout 61.
Pressed against and fixed. Since the cap 62 has a cap structure that closes the spout 61 by pressing the valve 62 by the urging force of the coil spring 62, the gas in the flow path of the second heat medium can be automatically opened by opening the valve by gas pressure.
Further, the overflow of the second heat medium can be recovered through the overflow pipe 61c.

On the other hand, when the opening / closing cap 62 is removed when replenishing the second heat medium or the like, the cap main body 62d is rotated against the urging force of the coil spring 62b so that the engaging projection 62e is formed in the notch 61d. At this time, the opening / closing cap 62 may be lifted.

According to the heat exchanger of this embodiment, the spout 61
The second heat medium can be easily supplied by using the
Degassing in the flow path of the heat medium and recovery of the overflow of the second heat medium can be automatically performed, thereby avoiding a failure of the heat exchanger and reducing maintenance for the heat exchanger. Other functions and effects are the same as those of the first embodiment.

[Application Example of the Present Invention] FIGS. 12 and 13 show application examples of the present invention, respectively.

FIG. 12 shows an example in which the product of the present invention is used as a condenser of a heat pump type air conditioner for a vehicle. In FIG. 12, reference numeral 71 denotes an electric compressor, and 72 denotes a water-refrigerant heat exchanger according to the present invention. , 73 are the reserve tanks, 74
Is a heater core, 75 is an outdoor heat exchanger, 76 is an indoor heat exchanger, 77 and 78 are expansion valves, 79 to 82 are solenoid valves, 83 and
84 is a check valve, 85 is a liquid receiver, 86 is an electromagnetic pump, 87
Is an air conditioning duct, 88 is a blower fan, 89 is an intake switching damper, and 90 is an air mix damper.

During the heating operation, the refrigerant discharged from the compressor 71 flows into the water-refrigerant heat exchanger 72 via the solenoid valve 79 as shown by the broken line arrow in the drawing, and is checked by the check valve 83 and the liquid receiver 85.
And flows into the outdoor heat exchanger 75 via the expansion valve 77,
The process returns to the compressor 71 via the solenoid valve 81. In the water-refrigerant heat exchanger 72, heat exchange is performed between the refrigerant and the water, and the heated water (hot water) is sent to the heater core 74 by an electromagnetic pump 86 as shown by a solid line arrow in the drawing. The heat of the heater core 74 is used to heat the vehicle interior.

On the other hand, FIG. 13 shows an example in which the product of the present invention is used as an evaporator of a heat pump type air conditioner for a vehicle. In FIG. Exchanger, 93 is its reserve tank,
94 is an indoor condenser, 95 is an outdoor heat exchanger, 96 is an indoor heat exchanger, 97 to 99 are expansion valves, 100 to 103 are solenoid valves, 104 and 105 are check valves, 106 is a liquid receiver, 107
Is a traction motor which is a heat source, 108 is a water circulation container arranged around the traction motor 107, 109 is an electromagnetic pump, 110 is an air conditioning duct, 111
Is a blower fan, 112 is an intake switching damper, and 113 is an air mix damper.

During the heating operation, the refrigerant discharged from the compressor 91 flows into the indoor condenser 94 through the solenoid valve 100 as shown by the dashed arrow in FIG. Room heating is performed. The refrigerant that has passed through the indoor condenser 94 is diverted through the check valve 104 and the liquid receiver 106, one of which flows into the outdoor heat exchanger 95 through the expansion valve 97, and the other is diverted into the expansion valve 98. , Flows into the water-refrigerant heat exchanger 92, and returns to the compressor 91 via the solenoid valve 102. The exhaust heat of the traction motor 107 is transmitted to the water in the water circulation container 108, and the heated water (hot water) is supplied to the electromagnetic pump 1 as shown by a solid line arrow in the figure.
In step 09, the water is sent to the water-refrigerant heat exchanger 92, and heat exchange is performed between the hot water and the refrigerant.

[0047]

As described in detail above, according to the first aspect of the present invention, the passage for the second heat medium is formed in parallel with the adjacent tubes by utilizing the gap between the adjacent tubes. Even if the exchanger itself is downsized, a sufficient heat transfer area can be ensured, thereby providing a heat exchanger that can easily secure the heat transfer area and easily downsize.

According to the second aspect of the present invention, the partition wall provided in the space inside the pipe and the partition wall provided in the space between the pipes can meander the flow paths of the first heat medium and the second heat medium in the same manner. As a result, the heat exchange performance can be improved by securing a large flow path length in a small space, and the flow path configuration can be easily changed simply by increasing the number of tubes and each partition wall, and the heat transfer area can be increased. Can be expanded. Other effects are the same as those of the first aspect.

According to the third aspect of the present invention, each inlet and outlet are determined so that the flow direction of the first heat medium in the passage in the tube and the flow direction of the second heat medium in the passage between the tubes face each other. Therefore, the first heat medium and the second heat medium can exchange heat with high efficiency, thereby contributing to performance improvement. Other effects are the same as those of the first and second aspects of the invention.

According to the fourth aspect of the present invention, the supply of the second heat medium can be easily performed using the spout, and the degassing of the flow path of the second heat medium is automatically performed, so that the failure of the heat exchanger occurs. Can be avoided. Other effects are the same as those of the first to third aspects.

According to the fifth aspect of the present invention, the overflow of the second heat medium is automatically recovered, and the maintenance for the heat exchanger can be reduced. Other effects are the same as those of the first to fourth aspects.

[Brief description of the drawings]

FIG. 1 is a perspective view of a heat exchanger according to a first embodiment of the present invention.

FIG. 2 is a partially exploded perspective view of the heat exchanger shown in FIG.

FIG. 3 is a partially cutaway side view of the heat exchanger excluding a second header pipe.

FIG. 4 is a cross-sectional view showing a partition wall structure in a space inside a pipe and a partial cross-sectional view showing a modification of the partition wall structure.

FIG. 5 is a partial perspective view of a tube and a sectional view taken along line AA of FIG.

FIG. 6 is a sectional view taken along line BB of FIG. 3;

FIG. 7 is a sectional view taken along line CC of FIG. 1 and a partial exploded view thereof;

FIG. 8 is a diagram showing flows of a first heat medium and a second heat medium.

FIG. 9 is a sectional view showing a modification of the tube.

FIG. 10 is a perspective view of a heat exchanger according to a second embodiment of the present invention.

11 is a sectional view taken along line DD of FIG.

FIG. 12 is an air conditioning circuit diagram showing an application example of the product of the present invention.

FIG. 13 is an air conditioning circuit diagram showing an application example of the product of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... 1st header pipe, 4 ... partition wall, 11 ... tube, 21 ... inlet pipe, 22 ... outlet pipe, 31 ... 2nd header pipe, 34 ... partition wall, 41 ... inlet pipe, 42 ... outlet pipe,
K1: passage between tubes, K2: space between pipes, 51 to 5
5: tube, 61: spout, 61c: overflow pipe, 62: opening / closing cap, 62a: valve, 62b: coil spring.

Continuation of the front page (58) Fields investigated (Int.Cl. ⁷ , DB name) F28D 7/00 F28D 1/053 F28F 9/02 301 F28F 9/26 F28F 9/00 331 F28D 1/06

Claims (5)

(57) [Claims] 1. A heat exchanger for mutually exchanging heat between a first heat medium and a second heat medium in a non-contact state, comprising: a pair of first header pipes parallel to each other; A plurality of tubes connected to each other and forming parallel passages between the tubes adjacent to each other in a connected state by an outer wall portion provided on a width direction side edge, and a plurality of tubes parallel to each other; and arranged outside the first header pipe. A pair of second header pipes that form a space communicating with the inter-tube passage between the first header pipe and the first heat medium by the pair of pipe internal spaces and the plurality of tube passages. And a flow path for a second heat medium is configured by the pair of spaces between pipes and the plurality of tubes. 2. A partition wall is provided in at least one of the pipe spaces so that the flow path for the first heat medium is meandering, and at least one of the flow paths for the second heat medium is meandering similarly. The heat exchanger according to claim 1, wherein a partition wall is provided in the space between the pipes. 3. An inlet and an outlet for the first heat medium in the first header pipe such that a flow direction of the first heat medium in the passage in the tube and a flow direction of the second heat medium in the passage between the tubes are opposite to each other. The heat exchanger according to claim 1 or 2, wherein an inlet and an outlet for the second heat medium are provided in the second header pipe. 4. A spout for a second heat medium is provided in one of the second header pipes, and a cap provided with a valve capable of closing the spout under spring bias is provided in the spout. The heat exchanger according to claim 1. 5. The heat exchanger according to claim 1, wherein a passage for collecting an overflow of the second heat medium is provided in the spout.