JPH1163788A - Heat exchanger, refrigerator using the same and mounting method of pipe for heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger or the like which substantially improves a heat exchange efficiency without requiring any large-scale device. SOLUTION: This heat exchanger has a plurality of U-shaped flexures 2b of a pipe arranged at both ends thereof and is assembled on other parts, by mounting plates 15 into which the U-shaped flexures are respectively inserted. The mounting plates 15 are provided with a plurality of bent return parts 15a which each have two notches formed to match the sectional shapes of two legs of the U-shaped flexure. In a state where the perimeter of the two legs is closed by the bent return part 15a, the legs and the mounting plates 15 are securely caulked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a pipe having U
The present invention relates to a heat exchanger in which a plurality of U-shaped folds are arranged, and each of the U-shaped folds is inserted into another component by a mounting plate through which the U-shaped folds are inserted, a refrigerator using the same, and a method of mounting a pipe for a heat exchanger.

[0002]

2. Description of the Related Art A technique of installing a heat exchanger in a duct and causing air in the duct to flow by a blower to cause forced convection to promote heat exchange is disclosed in, for example, Japanese Utility Model Laid-Open No. 5-73481.
No., published in Japanese Unexamined Patent Publication No.

In this prior art, as shown in FIG. 14, a plate condenser 1 as a heat radiator is provided in a metal duct.
00 and a wire capacitor 101, and a fan 103
Is rotated to suck outside air into the machine room through the duct, thereby cooling the radiator and the compressor.

On the other hand, Japanese Patent Application Laid-Open No. 6-201289 discloses a technique for mounting a heat exchanger on a mounting plate.

In this prior art, as shown in FIG. 15, a notch is provided in an end plate (attachment plate) 201 which has a role of fixing the heat exchanger to other parts, and a U-bend portion 202 of the heat exchanger is formed. The part 203 that has been bent in advance to insert the heat exchanger is bent back and fixed.

[0006]

In order to efficiently radiate the heat of the refrigerator by the forced convection method, a duct structure in which all the air flowed by the blower passes through a portion of the heat exchanger having a good heat transfer coefficient. is necessary.

In FIG. 16A, the duct 1 has a shape that completely covers the fin-implanted portion 2a and the U-bend portion 2b of the fin-tube heat exchanger 2.

As described above, when the duct 1 having an air passage section larger than the ventilation section of the fin implantation section 2a is used, the air resistance of the portion other than the fin implantation section 2a becomes smaller than that of the fin implantation section 2a. Most of the air that has flowed in the step passes through portions other than the fin implanted portion 2a.

In this case, most of the work of the fan cannot contribute to the heat exchange, and the heat radiation efficiency is reduced.

On the other hand, as shown in FIG. 16B, if the structure is like a duct 3 which covers the upper, lower, left and right sides of the fin implant 2a with planes 3a, 3b, 3c and 3d,
All of the air flowed by the blower is in the fin implant portion 2a.
It is efficient because it passes through.

[0011] However, conventionally, a refrigerator condenser is often constituted by a meandering pipe because of the simplicity of the manufacturing process.
No means is provided for forming the plane 3b and the plane 3d that divide the "a" and the U-bend 2b.

For this reason, conventionally, as shown in FIG. 14, the entire heat exchanger has to be covered.

The end plate shown in FIG. 15 looks as if it forms the planes 3b and 3d in FIG. 1 (b). A hole is formed.

Therefore, there is a problem that air is sucked in from each hole of the end plate, and the air volume of the fin implant portion 2a is reduced.

In view of such problems, an object of the present invention is to provide a heat exchanger which greatly improves heat exchange efficiency without using a large-scale device, a refrigerator using the same, and
An object of the present invention is to provide a method for mounting a pipe for a heat exchanger.

[0016]

According to one aspect of the present invention for achieving the above object, a plurality of U-shaped folds of a pipe are arranged at both ends, and each of the U-shaped folds is inserted. In a heat exchanger assembled to another component by an attachment plate, the attachment plate includes a plurality of bent back portions each having two notches formed in accordance with a cross-sectional shape of the two legs of the U-shaped folded portion. The heat exchanger is provided, wherein the legs and the mounting plate are fixed in a state where the periphery of the two legs is closed by the bent back portion.

According to another aspect of the present invention to achieve the above object, a duct constituted by upper and lower upper and lower plates and left and right mounting plates, and a duct installed inside the duct and having a A heat exchanger having a size sufficient to substantially occupy the space and having a plurality of U-shaped folds of pipes arranged at both ends inserted through a mounting plate, wherein the mounting plate includes the U-shaped A plurality of bent back portions having two notches formed in accordance with the cross-sectional shapes of the two legs of the folded back are provided, and in a state where the periphery of the two legs is closed by the bent back portion, A refrigerator is provided in which these legs and the mounting plate are fixed.

According to still another aspect of the present invention, there is provided a method for mounting a heat exchanger pipe having a plurality of U-shaped folds to a mounting plate. A first step of cutting and raising to form through-holes, and inserting the U-shaped folds into the through-holes, and bending the cut-and-raised portion formed in the first step back to form the U-shaped A second step of crimping on the two legs of the fold, said cut and raised portion having two rounded notches crimped on said two legs, each notch comprising: In a state before the cut-and-raised operation, the distance T1 between the deepest part of the notch and the mounting plate body in the depth direction of the notch is formed to be smaller than the outer diameter P1 of the leg. For heat exchanger Mounting method type is provided.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, in this embodiment, a fin tube type heat exchanger 2, which is a condenser of the refrigerator, is provided in a machine room 10 at the bottom of the refrigerator. In this fin tube type heat exchanger 2, a plurality of U-shaped pipe folds are arranged at both ends, and each of the U-shaped folds is assembled to another component by a mounting plate through which each is inserted. Specifically, it is as shown below.

The fin-implanted portion 2a of the fin tube type heat exchanger 2 includes an upper plate 14, a lower plate 11, and two mounting plates 15
Is surrounded by the top, bottom, left and right. These parts (top plate 1
4, the lower plate 11, and the two mounting plates 15) constitute a duct 17, and the heat exchanger 2 is large enough to substantially occupy the space in the duct. The upper plate 14 also serves as an evaporating dish.

The flow-through fan 12 allows the air in the duct 17 to flow, and at the same time, applies the air that has passed through the duct 17 to the compressor 9 to promote the heat radiation of the fin-tube heat exchanger 2 and the compressor 9.

The fan cover 13 is an air passage connecting the once-through fan 12 and the duct 17. The totte 7 is used when a worker carries a heat exchanger.

The mounting plate 15 has a role of fixing the fin tube type heat exchanger 2 to the lower plate 11. The mounting plate 15 and the lower plate 11 are metal members, which are fixed by caulking using, for example, a caulking punch 16.

A guide rail is formed above the mounting plate 15 so that the evaporating dish 14 can be removed in the Y direction.

The mounting plate 15 has a role of closing a U-shaped bent portion (U-bend portion) 2b of the pipe and a fin implant portion 2a.

As shown in the enlarged view of the portion A in FIG.
The mounting plate 15 is formed with a T-shaped cut-and-raised portion 15a and a square hole 15b for inserting the U-bend portion 2b.

After the U-bend 2b is inserted into the square hole 15b, the T-shaped cut-and-raised portion 15a is bent back, so that the two legs (the legs 2b1, 2b) of the U-bend 2b are formed.
b2: see FIG. 2) and the U-bend portion 2
b and the mounting plate 15 are fixed by caulking.

The vibration generated in the compressor 9 and the like is transmitted to the U-bend portion 2b and the caulking portion of the mounting plate 15 via the compressor base 8, the lower plate 11, and the mounting plate 15, so that the U-bend portion 2b And the mounting plate 15 may vibrate to generate chatter noise.

Therefore, in the present embodiment, when the cut-and-raised portion 15a is bent back, a part of the cut-and-raised portion 15a covers the two legs. That is,
A flange 15c is formed on the side circumference of each leg along the pipe shape of the leg.

As a result, the adhesion between the members is improved, and chatter noise is largely suppressed.

As described above, in this embodiment, since the upper, lower, left, and right sides of the fin-implanted portion 2a of the fin-tube heat exchanger 2 are surrounded by the plate material without any holes, all the air flowed by the through-flow fan 12 is finned. It passes around the implanted portion 2a, and the heat exchange efficiency is greatly improved.

In the refrigerator having such a duct structure having good heat exchange efficiency, the power consumption is significantly reduced.

Next, details of a connection portion between the fin tube type heat exchanger 2 and the mounting plate 15 will be described with reference to FIGS. FIG. 2 is a three-side view of the portion A shown in FIG.

The cut-and-raised portion 15a is formed by two rounded notches (notches 15a1, 15a) which are crimped to two legs (legs 2b1, 2b2) of the U-bend portion 2b.
2).

In each of the notches, in the state before cutting and raising (in the state of FIG. 3), the distance T1 between the deepest part of the notch and the mounting plate body in the depth direction of the notch is determined by the outer diameter of the leg. It is formed to be smaller than P1.

Each notch is formed so that the mutual distance T2 between the two notches is larger than the mutual distance P2 between the two legs.

Further, each notch is provided with a cut-and-raised portion 15.
The distance T3 in the width direction of the notch between the side edge of a and the inner part of the notch is formed to be smaller than the outer diameter P1 of the leg.

The conditions are summarized as follows.

[0040]

(Equation 1)

[0041]

(Equation 2)

[0042]

(Equation 3)

Needless to say, the cut-and-raised part 1
The size of 5a is designed so that a through-hole through which the U-bend portion 2b can be inserted is formed.

However, the outer diameter of the pipe of the fin tube type heat exchanger 2 needs to be considered in consideration of the maximum dimension P4 of the expanded portion because the central portion thereof is expanded by the bending process when forming the U-bend portion 2b. There is. Specifically, it is as follows. T4 is the height of the through hole. T5 is
This is the width of the through hole. P3 is the width of the U-bend 2b.

[0045]

(Equation 4)

[0046]

(Equation 5)

Next, a method of attaching the pipes of the fin tube type heat exchanger 2 to the attachment plate 15 will be described with reference to FIGS.

In the first step shown in FIG. 4, the fin tube type heat exchanger 2 is positioned with the U-bend portion 2b positioned in the comb-shaped concave portion of the pedestal 25.

On the other hand, the mounting plate 15 is positioned on the pedestal 26 and is pressed against and fixed to the pedestal 26 by the fixing lever 21.

In the second step shown in FIG. 5, the receiving table 26 on which the mounting plate 15 is placed is moved on the table 23 by the pusher 22 until the receiving table 26 is pressed against the receiving table 25. This allows
The U-bend 2b is inserted into the square hole 15b of the mounting plate 15.

In the third step shown in FIG.
Descends. As a result, the cut-and-raised portion 15a of the T-shape is bent back, and the periphery of the U-bend portion of the square hole 15b is closed.

At this time, when T1 <P1, the U-bend portion is crimped up and down, and when T2> P2, the U-bend portion is crimped so as to be spread, and T3 <P1. As a result, the U bend portion is swept right and left.

A part of the bent-back cut-and-raised portion (that is, the bent-back portion) 15a follows the bending punch 20 by using the pipe of the U-bend portion 2b as a die, thereby forming the flange 15c. .

In the fourth step shown in FIG.
Rise, and the fixed lever 21 is released. At this time, the fin-tube heat exchanger 2 is released by the force of the spring 24 extending. Thereafter, the cradle 26 is retracted by the pusher 22.

The above is an example of a method for attaching a pipe for a heat exchanger. The attachment plate 15 is shown in FIG.
As shown in (1), a receiving portion 15d for receiving the two legs of the U-bend portion may be provided. In FIG. 13B,
When the flange 15c is not formed, when the flange 15c is formed, the receiving portion 15d is further provided in addition to the flange 15c.
Are formed in order, the strength with respect to the moment M caused by the vibration F increases as going to the right.

FIG. 8 is a development view of the machine room of the embodiment shown in FIG.

As shown in the figure, in this embodiment, the fan cover 13 and the cross-flow fan 12 are separate parts.

However, in order to reduce the number of parts and improve workability, a fan integrated cover 30 may be employed as shown in FIGS.

The shaft of the fan motor 12b is connected to the fan blade 12a of the once-through fan.
Bearing 12c attached to fan integral cover 30
It is supported by.

It is necessary to provide a complicated structure such as a nose in the fan integral cover 30 in order to make the flow-through fan function. Therefore, the fan integral cover 30 is formed by a method such as injection molding or blow molding. It is preferably formed of a resin.

Further, as shown in FIG.
A propeller fan 32 may be used in place of 2. The propeller fan 32 is driven by the fan motor 31. The fan cover 33 may be formed so that the duct side conforms to the shape of the duct opening and the fan side conforms to the outer periphery of the fan.

In the embodiment shown in FIG. 1, FIG.
As shown in (a), the evaporating dish 14 is located above the fin tube type heat exchanger 2.

However, as shown in FIG. 12B, the present invention is also applicable to a structure in which the evaporating dish 14 does not exist above the fin tube type heat exchanger 2.

That is, the bottom plate 39 located at the lowermost part of the heat insulating material (a member for insulating the inside of the refrigerator 41 from the outside) 40
If a structure in which the mounting plate 15 is abutted directly or via a cushioning material (not shown) is employed, an ideal duct structure can be formed, and the same effect as the embodiment of FIG. 1 can be obtained. Obtainable.

[0065]

As described above, according to the present invention, the heat exchange efficiency of the heat exchanger is greatly improved, and the power consumption of the refrigerator is significantly reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is an explanatory view (part 1) of a caulked portion between a heat exchanger and a mounting plate in one embodiment of the present invention.

FIG. 3 is an explanatory view (part 2) of a caulked portion between the heat exchanger and the mounting plate according to the embodiment of the present invention.

FIG. 4 is an explanatory view (part 1) of a step of attaching the heat exchanger to the attachment plate in the embodiment of the present invention.

FIG. 5 is an explanatory view (2) of the step of attaching the heat exchanger to the attachment plate in the embodiment of the present invention.

FIG. 6 is an explanatory view (3) of a step of attaching the heat exchanger to the attachment plate according to the embodiment of the present invention.

FIG. 7 is an explanatory view (4) of the step of attaching the heat exchanger to the attachment plate in the embodiment of the present invention.

FIG. 8 is a development view of an embodiment of the present invention.

FIG. 9 is an explanatory view (part 1) of an embodiment of the present invention of a type including a fan integral cover.

FIG. 10 is an explanatory view (part 2) of an embodiment of the present invention of a type including a fan integral cover.

FIG. 11 is an explanatory view of an embodiment of the present invention of a type having a propeller fan.

FIG. 12 is an explanatory view of an embodiment of the present invention in which the evaporating dish is not provided on the upper part of the heat exchanger.

FIG. 13 is an explanatory view of an embodiment of the present invention of a type in which a receiving portion for receiving a leg portion of a U-bend portion is formed.

FIG. 14 is an explanatory diagram (part 1) of a conventional technique.

FIG. 15 is an explanatory diagram (part 2) of a conventional technique.

FIG. 16 is an explanatory diagram showing a flow of air flowed by a blower.

[Explanation of symbols]

2 ... Fin tube type heat exchanger, 2a ... Fin implantation part, 2b ... U-bend part, 7 ... Totte, 8 ... Compressor base, 9 ... Compressor, 10 ... Machine room, 11 ... Lower plate, 12 ... Flow-through fan , 13 ... fan cover, 14 ... evaporating dish, 15 ...
Mounting plate, 15a: cut-and-raised portion, 15b: square hole, 15
c: flange portion, 15d: receiving portion, 16: caulking punch, 17: duct

Continued on the front page (72) Inventor Mitsutaka Shizuya 502 Kandachi-cho, Tsuchiura-shi, Ibaraki Machinery Research Laboratory, Hitachi, Ltd. Within the business division

Claims (11)

[Claims] 1. A heat exchanger in which a plurality of U-shaped folds of a pipe are arranged at both ends and each of the U-shaped folds is attached to another component by a mounting plate through which the U-shaped wrap is inserted. A plurality of bent back portions having two notches formed in accordance with the cross-sectional shapes of the two U-shaped folded legs are provided, and the periphery of the two legs is closed by the bent back portion. The heat exchanger wherein the legs and the mounting plate are fixed in a state. 2. The heat exchanger according to claim 1, wherein said two legs and said bent-back portion are caulked. 3. The heat exchanger according to claim 2, wherein a part of the bent-back portion covers the two legs to form a flange. 4. The heat exchanger according to claim 1, wherein the mounting plate further has a receiving portion formed around the bent back portion for receiving the two legs. A heat exchanger. 5. A refrigerator comprising the heat exchanger according to claim 1, 2, 3, or 4. 6. A duct constituted by upper and lower plates and upper and lower plates and left and right mounting plates, and installed inside the duct, having a size that occupies substantially the space in the duct, and is provided at both ends. A heat exchanger having a plurality of U-shaped folds of pipes inserted through a mounting plate, wherein the mounting plate is formed in accordance with a cross-sectional shape of two legs of the U-shaped fold. A plurality of bent back portions having two notches, and the legs and the mounting plate are fixed in a state where the periphery of the two legs is closed by the bent back portion. A refrigerator characterized by the following. 7. The refrigerator according to claim 6, wherein said two legs and said bent back portion are caulked. 8. The refrigerator according to claim 6, wherein the upper plate is an evaporating dish, and the mounting plate is formed with a guide rail for attaching and detaching the evaporating dish to and from the mounting plate. A heat exchanger. 9. A method for mounting a heat exchanger pipe having a plurality of U-shaped folds to a mounting plate, wherein a plurality of portions of the mounting plate are cut and raised to form through holes.
A first step of inserting the U-shaped fold into each of the through holes, and bending and returning the cut-and-raised portion formed in the first step to the two legs of the U-shaped fold. Having a second step of crimping, wherein the cut-and-raised portion is crimped to the two legs,
Each of the notches has a distance T1 between the deepest part of the notch and the mounting plate body in the depth direction of the notch in the state before the notch is raised, and each of the notches has the leg portion. Characterized in that it is formed to be smaller than the outer diameter P1 of the pipe. 10. A method for attaching a heat exchanger pipe having a plurality of U-shaped folds to a mounting plate, wherein a plurality of portions of the mounting plate are cut and raised to form through holes.
A first step of inserting the U-shaped fold into each of the through holes, and bending the cut-and-raised portion formed in the first step back to fit the two legs of the U-shaped fold. Having a second step of crimping, wherein the cut-and-raised portion is crimped to the two legs,
It has two rounded notches, and each notch is formed such that the mutual distance T2 between the two notches is greater than the mutual distance P2 between the two legs. How to install the heat exchanger pipe. 11. A method for attaching a heat exchanger pipe having a plurality of U-shaped folds to a mounting plate, wherein a plurality of portions of the mounting plate are cut and raised to form through holes.
A first step of inserting the U-shaped fold into each of the through holes, and bending the cut-and-raised portion formed in the first step back to fit the two legs of the U-shaped fold. Having a second step of crimping, wherein the cut-and-raised portion is crimped to the two legs,
The notch has two rounded notches, and each notch has a distance T3 in the width direction of the notch between a side edge of the cut-and-raised portion and an inner portion of the notch, and an outer diameter P1 of the leg. A method for attaching a pipe for a heat exchanger, wherein the pipe is formed so as to be smaller than the pipe.