JP2002372316A - Refrigerating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerating device, being high in reliability, at a low cost. SOLUTION: The refrigerating device is provided with a compressor, a condenser, a capillary tube, and an evaporator. This is a refrigerating cycle through which a refrigerant is fed and circulated, in the order. A suction pipe through which the refrigerant is sucked from the evaporator toward the compressor and flows is provided with a large diameter part having a large diameter, small diameter parts having a small diameter and connected to the two ends of the large diameter part and a groove formed in the large diameter part along the axial direction of the suction pipe for containing the capillary tube in the inner side thereof. The inside surface of the groove is contact with a half or more of the periphery of the capillary tube.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a refrigerator, a freezer,
The present invention relates to a refrigeration system that compresses a refrigerant such as a dehumidifier to perform cooling.

[0002]

2. Description of the Related Art In a conventional refrigerating cycle of a refrigerator or the like, a gas of a high-temperature and high-pressure refrigerant compressed by a compressor is condensed by a condenser to become a high-pressure liquid, and flows into a capillary connected to the condenser. Here, the refrigerant is reduced in pressure and becomes a refrigerant in which a low-temperature low-pressure gas and liquid are mixed. And it flows into an evaporator from a capillary tube. Here, heat exchange with the outside of the evaporator causes heat to be absorbed and gas is formed, and thereafter, a cycle configuration is established in which the refrigerant returns to the compressor through a suction pipe of the refrigerant to the compressor. Here, in order to improve the effective refrigeration capacity of the refrigeration cycle and realize energy saving of a refrigerator or the like, the outer peripheral surfaces of the suction pipe and the capillary are joined to each other using a joining material (for example, soldering). In general, heat exchange is performed by conducting heat through the solder.

[0003] In this technique, the volume of the refrigerant flowing through the suction pipe and flowing into the compressor is reduced by heat exchange with the refrigerant in the capillary tube, thereby improving the compression efficiency of the compressor. be able to. In such a conventional technique, the evaporation temperature is −30 ° C. as in a normal home refrigerator.
In the case of a refrigeration cycle near and low, for example, 10 to 15
This means that the efficiency can be improved by about%.

[0004] In the refrigeration cycle as described above, solder is used as a joining material to bring two pipes into contact with each other. However, the use of solder has led to problems such as corrosion due to oxidation of chloride contained in the solder and moisture entering the joint between the solder and the tube, corrosion due to a potential difference, and breakage due to vibration of the joint. I was Therefore, as an example of a technique for solving such a problem, Japanese Utility Model Laid-Open No. 55-1599 has been proposed.
A technique described in Japanese Patent Application No. 75 (Japanese Utility Model Application No. 54-059879) (prior art) is known.

[0005] In this prior art, a capillary tube is arranged along a concave portion provided in a longitudinal direction of a pipe constituting a suction tube, and a foamed polyethylene resin is applied to the entire periphery of the two tubes arranged along each other. After application, it is cured. Further, in this configuration, no solder is used, and the use of a lead component contained in the solder is intended to solve the problem of unfavorable hygiene and environment.

[0006]

In the above prior art,
When the suction tube and the capillary tube are brought into contact with each other, there is a problem that unless the working accuracy of the dent to be formed is made high, the degree of contact is likely to vary, leading to a decrease in the refrigerating capacity. The prior art does not consider that there is a problem that the manufacturing cost is increased when the machining precision for forming the dent is increased.

In the structure of the prior art, if the pipe diameter of the suction pipe remains the same, the recessed portion reduces the cross-sectional area of the suction pipe. The resistance increases. Therefore, it is conceivable to increase the diameter of the suction pipe provided with the concave portion.For this reason, a relay pipe is added to both ends of the suction pipe provided with the concave portion, so that the suction pipe is provided with a pipe of another refrigeration cycle having a different pipe diameter. Connection was made. Therefore, when assembling the unit of the tube including the suction tube into the product, an assembling operation of attaching the relay pipe together with the capillary tube to the suction tube side is performed before assembling. For this connection, welding, crimping, pipe expansion for expanding the pipe diameter, and the like can be considered.

In the above-mentioned prior art, no consideration has been given to a configuration capable of efficiently manufacturing and reducing costs in connecting such pipes. In addition, no consideration has been given to the problem that the addition of the relay pipe increases the number of welding points and lowers the reliability.

An object of the present invention is to provide a low-cost and highly reliable refrigeration system.

[0010]

SUMMARY OF THE INVENTION The object of the present invention is to provide a refrigeration cycle comprising a compressor, a condenser, a capillary tube and an evaporator. A large-diameter portion provided in a suction pipe which is sucked and flows from the compressor toward the compressor, a small-diameter portion having a small pipe diameter connected to both ends of the large-diameter portion, and the suction port is connected to the large-diameter portion. This is achieved by a refrigerating device having a groove provided along the tube axis direction of the tube and having the capillary housed therein and a surface inside the groove being in contact with １ ／ or more of the circumference of the capillary. You.

[0011] It is further achieved by providing a connecting portion provided in the small diameter portion and connected to a refrigerant pipe through which the refrigerant flows.

Further, it has a Taber-shaped portion provided in the suction pipe and formed between the large-diameter portion and the small-diameter portion, and an end of the groove provided in the tapered portion,
This is achieved by the capillary extending from the end of the groove.

A refrigeration cycle including a compressor, a condenser, a capillary, and an evaporator, in which a refrigerant is supplied and circulated in this order, wherein the refrigerant is sucked from the evaporator to the compressor. A groove provided in the flowing suction pipe along the pipe axis direction of the suction pipe, wherein the capillary is fitted to a depth of at least half the diameter of the pipe, and a groove in the pipe axis direction of the capillary of the groove. Is smaller than the diameter of the capillary tube.

Further, the groove is achieved by providing a shape in which the width of the groove decreases from the pipe axis of the suction pipe toward the outer periphery thereof.

[0015] Further, it is achieved that the capillary is attached so as to extend from the end of the portion fitted into the groove in a direction away from the suction tube.

[0016]

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

FIG. 1 is a block diagram showing a schematic configuration of a refrigeration cycle according to a first embodiment of the refrigeration apparatus of the present invention. In FIG. 1, 1 is a compressor, 2 is a condenser, 3 is a capillary tube, 4 is an evaporator, 5 is a suction pipe, and the high-temperature and high-pressure gas compressed by the compressor 1
The refrigerant circulates in the order of → 2 → 3 → 4 → 5 to return to the compressor 1 again.

FIGS. 2 and 3 are views for explaining the components of the suction pipe and the capillary. FIG. 2 is a diagram illustrating the configuration of the suction pipe 5 and the capillary 3 shown in FIG. FIG. 3 is a cross-sectional view showing the Y-Y cross section of the suction pipe and the capillary shown in FIG. 2, and in particular, FIG.
FIG. 4 is a cross-sectional view showing an intermediate step before the capillary 3 is fitted into the groove 6 of FIG. FIG. 4 is a longitudinal sectional view showing a schematic configuration of a refrigerator in which the refrigerator shown in FIG. 1 is incorporated.

In the present embodiment, the diameter of the suction pipe central portion 5a is about 8 to 8.5 mm. Here, the diameter of the suction pipe 5a is set to be larger than the diameter of the refrigerant pipe constituting another refrigeration cycle. The reason is,
This is because the output value of the compressor is reduced and the power consumption of the refrigerator is reduced by reducing the flow path resistance of the refrigerant flowing in the refrigeration cycle during operation of the refrigeration cycle such as a refrigerator.

Small-diameter (small-diameter) pipes 8a and 8b are formed at both ends of a large-diameter pipe 5a used between the compressor 1 and the evaporator 4 via taper portions 9. The pipe diameter at both ends is formed to be about 6 mm in diameter via the tapered portion 9. And this small diameter (small diameter)
The pipes 8a and 8b are connected to a connection pipe 1a on the compressor side on the refrigerator side and a connection pipe 4a on the evaporator side as shown in FIG. The size of the small-diameter (small-diameter) pipe can be changed according to the size of the connection pipe on the product side, and is not limited to 6 mm. In other words, the size of the small-diameter (small-diameter) pipe can be formed into a desired diameter via the taper portion. Further, since the tapered portion 9 of the large diameter pipe 5a has a tapered shape between different diameters, it smoothly circulates without obstructing the flow path resistance of the refrigerant flowing inside the pipe. It has a refrigeration cycle configuration that can be used.

The reason why the pipe diameter of the suction pipe is made larger than the pipe diameter of the refrigeration cycle parts is that the flow resistance on the suction side in the refrigeration cycle pipe is reduced to suppress the output value of the compressor. This improves the refrigeration capacity. Therefore, the refrigerating capacity of a refrigerator or the like is secured by the synergistic effect of a combination of the heat exchange length due to the contact between the capillary tube and the suction pipe and the inner diameter of the suction pipe (the size of the cross-sectional area on the suction side), thereby ensuring the necessary refrigerating capacity of the refrigerating cycle. Is what it is.

As shown in FIGS. 2 and 3, a groove 6 is formed in the longitudinal direction of the large-diameter pipe 5a. The capillary 3 is continuously fitted to the inside of the groove 6 with a length of L dimension. In the fitting, the fitting is performed in a direction of the pipe axis (depth direction) of the large-diameter pipe 5a in the groove over a size of 1/2 or more, preferably 2/3 or more of the diameter of the capillary. And the large diameter pipe 5a inside the groove 6
Is in contact with or more, preferably ２ or more of the outer surface of the capillary 3 when viewed in a cross section perpendicular to the axial direction of the pipe. Further, in the configuration of the present embodiment, as the depth of the groove of the capillary tube 3 decreases, the surface of the large-diameter pipe 5a that comes into contact with the capillary tube 3 inclines so that the width of the groove becomes smaller. It is provided. In other words, the widthwise shape of the groove of the capillary 3 becomes smaller as the depth of the groove becomes smaller, or the inner surface of the groove of the large diameter pipe 5a on the surface of the capillary 3 in an inclined portion. Is in contact with That is, the size of the capillary in the width direction has a portion smaller than the minimum size of the width of the groove and the distance between the contact surfaces facing each other across the tube axis direction of the groove (axial direction of the groove). are doing.

With such a configuration, the large-diameter pipe 5a
The capillary tube 3 and the capillary tube 3 are securely fitted to each other so as to be in close contact with each other, and the contact area between them is increased so that heat exchange is performed efficiently. Therefore, these pipes are appropriately fixed while maintaining a contact state so that heat can be exchanged, even if there is no sealing material such as a bonding material (solder material) or an externally fixed resin as in the prior art. I have. In addition, since there is no joining member between the two, deterioration such as corrosion due to ingress of moisture or destruction due to vibration can be suppressed.

Next, a description will be given of a configuration in which the groove 6 of the large diameter pipe 5a and the capillary 3 are assembled. In FIG. 3A, the depth h1 of the groove 6 formed in the large-diameter pipe 5a is set to reach the outer circumference of the small-diameter (small-diameter) pipe portions 8a and 8b formed at both ends. The depth of the groove 5 is smaller than the depth (8
a, 8b). The groove 6 is provided so that at least 1/2, preferably 2/3 or more, of the diameter of the capillary tube is fitted. Further, in this embodiment, the outer peripheral surface of the small-diameter (small-diameter) pipe is formed so as to coincide with the extension of the line connecting the lowermost portion of the depth h1 of the groove 6 continuous in the longitudinal direction. This facilitates the drawing process of the groove 6 of the large-diameter suction pipe 5a, and increases the area of contact between the capillary tube and the suction tube due to fitting thereof, making it difficult for the capillary tube and the suction tube to come off and improving the heat conduction performance.

Next, FIG. 4 shows a refrigeration cycle configuration when the above suction pipe assembly is incorporated in the refrigerator. FIG.
In the drawing, 5 is a suction pipe connected between the compressor 1 and the evaporator 4. In the heat insulating material 31, a large-diameter pipe 5 a is filled at the center of the suction pipe together with the capillary 3 between the inner box 29 and the outer box 30. Buried in The large-diameter pipe 5a has a large diameter of about 8 to 8.5 mm as described above, and small-diameter (small-diameter) pipes 8a and 8b formed by drawing are arranged at the upper and lower ends as shown in the figure. Have been. The diameter of these small diameter (small diameter) pipes is desirably about 6 mm. The diameter of a pipe for cycle parts such as a refrigerator is about 6 to 6.5 mm. Therefore, the diameter of the pipe at both ends of the large diameter pipe used between the compressor 1 and the evaporator 4 is formed to about 6 mm, so that it can be directly connected to each cycle component from the product side. A and B in the figure are the small-diameter (small-diameter) pipes 8a and 8b and the connecting pipe 4a on the evaporator 4 side in the refrigerator.
And a welded portion with the connection pipe 1a on the compressor 1 side are shown.

FIG. 3A is a cross-sectional view of the assembled structure of the large-diameter pipe 5a and the capillary 3. The capillary 3 having a diameter equal to the depth h1 of the groove 6 is disposed in the groove 6. It has become.
Then, the dimension of the opening h3 of the groove 6, that is, the minimum dimension of the width of the groove on the outer periphery of the large-diameter pipe is determined by the dimension of the capillary diameter d1 or the maximum dimension of the capillary in the width direction. The capillary 3 is formed by being compressed so as to be smaller, and the outer surface of the large diameter pipe 5a is pressed against the surface of the capillary 3 so as to be in contact therewith. I try not to jump out from inside.

To explain further, one half of the depth h1 in the groove
There is a center 3b of the capillary at the height ho of the position, and the lower side is a semicircle of the capillary with respect to the horizontal plane of this 3b. The inner surface 6a of the same groove 6 as the semicircular shape is formed so as to match.

In this way, when the capillary 3 is fitted, the inner surface 6a of the groove is not less than half (1/2) or more than 2/3 of the outer circumference of the capillary 3 on the cross section of the capillary in the axial direction. Are in surface contact over the length of. That is, over the length L, the outer surface of the capillary 3 has a groove (concave portion) of the large-diameter pipe 5a which is 以上 or more or ／ or more.
6a so as to be wrapped around the surface.

Next, on the upper side of the center 3b of the capillary 3 above the horizontal plane, after the large diameter pipe is compressed and formed, the ridgeline of the opening of the groove has the ridgeline of the capillary center 3b, the outer periphery of the capillary and the large diameter in the height direction. It is located between the contact 3c on the outer periphery of the pipe, and the area between 6d and 6d in the figure is the opening size (h3) of the groove.
Accordingly, the opening dimension h3 of the groove 6 is compressed and formed so as to be smaller than the dimension d1 of the capillary, so that the contact area between the surfaces of the two pipes is increased and the two pipes are reliably fixed.

Next, the shape of these capillaries before crimping will be described with reference to FIG. 3 (b). The ridgeline of the opening of the groove 6 before crimping (compressing and bringing them into contact) has an opening width h2.
The dimensions (the same as the diameter d1 of the capillary tube) and the height position between the center 3b of the capillary tube and the outer peripheral contact 3c are h4 in FIG.
The ridgelines 6c, 6c are respectively formed at the height positions of the dimensions. The capillary 3 in the groove is fitted at such a position, and then the capillary 3 is subjected to press-drawing processing on the large-diameter pipe 5a, so that the opening ridge lines 6c, 6c of the groove 6 are pressed against the outer peripheral surface 3a of the capillary. It is crimped.

Then, as shown in FIG.
6c moves to the outer peripheral surface of the capillary above the horizontal plane of the center 3b of the capillary 3 and becomes the position of 6d, 6d after crimping and drawing, and the capillary is at least 1/2 of the diameter of the capillary, preferably at least 2/3 of the diameter of the capillary. Is fixed so as to be wrapped in the groove 6. Therefore, based on the horizontal plane of the capillary 3b, the upper side comes into surface contact with the inner peripheral surface 6a of the groove 6 (1/2 or 2/3 or more of the capillary circumference) up to the outer periphery 6d of the capillary. At this time, the height position of 6d, 6d is h
5 (FIG. 3 (a)), it is lower than h4 before crimping. In other words, 1/2 or 2/3 or more of the diameter of the capillary tube can be continuously pressed into the groove in the longitudinal direction in the groove of the large diameter pipe, so that good heat exchange can be performed between the large diameter pipe and the capillary tube. Things.

Here, in FIG. 2B, the shape (FIG. 2A) after the capillary tube 3 is crimped from the state where the capillary tube 3 is fitted into the groove 6 of the large diameter pipe 5a will be described. FIG.
In (b), the lowermost surface of the groove 6 of the large-diameter pipe 5a is flush with the outer peripheral surfaces of the small-diameter (small-diameter) pipes 8a and 8b at both ends. FIG. 2 shows that a capillary tube is subjected to crimping and pulling processing in a groove of a large diameter pipe.
The shape is as shown in FIG.

In FIG. 2A, both end portions of the capillary tube 3 have a shape inclined with respect to the taper portion 9 in a direction away from the outer peripheral surface of the suction pipe. This is because when the groove 6 joins the capillaries as described above between the L dimensions of the groove 6,
At the boundary between the groove 6 and the large-diameter pipe 5a having no groove (the end of the groove), the taper 9 causes
The capillary is deformed in a direction in which the tip of the capillary rises and separates from the small-diameter (small-diameter) pipes 8a and 8b from the tapered portion 9 to the capillary tip. For this reason, it has a shape gradually inclined toward the tip end side of the capillary tube 3 with the taper portion 9 as a boundary.

In the prior art, when a refrigeration cycle is assembled in a refrigerator, the two ends of the capillary are previously inclined away from the suction pipe in an assembled state in which the suction pipe is connected to the connection pipe on the refrigeration cycle side. Work process was performed. By this inclination, a space between the pipes is formed, and a space for welding and connecting the pipes can be secured. On the other hand, in the present embodiment, the capillary is inclined and separated from the suction pipe at the stage of the crimping and drawing step of the capillary as described above, so that these steps become unnecessary in the configuration of the present invention, and the suction pipe assembly is manufactured. This improves the efficiency of the manufacturing process and reduces the manufacturing cost.

FIG. 3B shows a cross-sectional shape before the capillary tube 3 is fixed to the groove 6 of the large-diameter pipe 5a by crimping as described above, and the opening of the groove 6 of the large-diameter pipe 5a as shown in the drawing. The section size h2 is equal to the tube diameter d1 of the capillary tube 3.
Therefore, when the capillary 3 enters the groove 6, the inner peripheral surface 6 a in the groove 6 coincides with the outer peripheral surface 3 a of the capillary 3. Then, the capillary 3 is fitted into the groove 6 (FIG. 3).
(B)) and then the opening dimension h of the groove 6 as described above.
2 is press-formed (FIG. 3A) to h3 smaller than the pipe diameter d1 of the capillary 3 so that the groove 6 of the large-diameter pipe 5a extends over almost the entire peripheral surface (2/3 or more of the pipe diameter). It is joined so as to be wrapped by the inner peripheral surface 6a inside, so that the adhesion becomes denser and the contact area can be increased.

Therefore, the large-diameter suction pipe 5a and the capillary 3 can perform heat exchange by surface contact with each other's outer peripheral surfaces (3a and 6a). Further, on the inner side surface of the groove 6 with a capillary, the capillary is surrounded by a large-diameter pipe, so that the refrigerant flowing through the large-diameter pipe is disposed in the longitudinal groove through the thickness of the large-diameter pipe. The heat exchange can be performed on the larger outer surface of the drawn capillary tube. In such a technique for exchanging heat, the required refrigerating capacity of a refrigerating cycle of a refrigerator or the like can be secured without using a bonding material (solder material) conventionally used, and at the same time, energy saving can be realized.

Also, since two parts can be joined without a joining material, it is preferable from a sanitary and environmental point of view. Furthermore, since there is no need for a joining material, complicated devices or equipment can be eliminated, so that the cost of products can be reduced.
In addition, by fitting a part (capillary tube) that fits in a pipe groove having a certain shape and integrally forming the same, the degree of contact or the degree of contact between the two parts can be made uniform, improving the refrigerating ability of the product and improving reliability. It can provide customers with highly productive products.

FIG. 5 (a) shows an embodiment in which another groove 66 having the same shape as the groove 6 is provided on the opposite side (symmetrical position of the groove 6) of the groove 6 formed into a large diameter pipe. . The manufacturing method of this embodiment is performed according to a process procedure as shown in FIG.

That is, a jig for forming a small-diameter (small-diameter) pipe is provided at both ends except for the L dimension of the suction large-diameter pipe 5a. Thereafter, the grooves 6, 66 are formed in the large-diameter pipe by drawing. After that, the procedure is such that the capillaries 3 and 33 are fitted in the grooves and the capillaries are crimped to the large diameter pipe. FIG. 3 shows the inside of the groove 66 of this embodiment.
(A) has the same configuration (same shape) as above, and the depth h1 of the groove 66 is the depth to the outer periphery of the small-diameter (small-diameter) pipe formed at both ends, and the capillary 33 is fitted into the groove. Is what it is.

As described above, by attaching the capillary into the groove of the thick pipe so as to enter the circle formed by the thick pipe, the surface contact area between the outer peripheral surface of the capillary and the outer peripheral surface of the thick pipe is increased. Moreover, it can be secured over the entire length of the grooved pipe in the longitudinal direction. In addition, a groove (dent) in a thick pipe
Since the heat transfer area on the inner peripheral surface side of the thick pipe can be increased by forming the above, the refrigerant flowing in the thick pipe between the two (capillary tube and thick pipe) passes through the thickness of the thick pipe. Since the heat can be exchanged with the wide outer peripheral surface of the capillary tube, the heat exchange amount can be increased and the efficiency can be improved. Furthermore, since the capillary can be integrated into the circle of the large diameter pipe, the finished appearance of the suction pipe assembly is simplified, and the assembling work on the product side becomes easier. Further, since the two parts are integrated without a joining material, the weight of the assembly itself can be reduced.

Next, FIG. 5 (b) shows the groove 6 of the large diameter pipe 5a.
And 66 show the cross-sectional shapes before the two capillaries 3 and 33 are fixed by crimping. This drawing shows an embodiment in which a groove 66 having the same shape as the groove 6 in FIG. 3B is provided on the opposite side (a position symmetrical to the groove 6). The outer peripheral surface 33a is made to coincide with the outer peripheral surface 33a.

Next, a method for manufacturing a suction pipe and a capillary according to the present invention will be described with reference to FIG. In the figure, the shape seen from the left side is shown on the left side, and the whole shape of the processed drawing is shown on the right side.

First, (a) shows a material (copper tube) for the refrigeration cycle of the present embodiment. The upper part is a suction pipe 5 and the lower part is a capillary tube 3. The diameter of this pipe 5 is 12 mm to 13 mm, which is a thick material. The length is, for example, about 2500-3000 mm. The size of the diameter and the length in the longitudinal direction vary depending on the size or specifications of the product.
The outer diameter of the capillary 3 is 1.8 mm to 2.0 mm, and its length is, for example, about 3000 mm. The length of the capillaries also depends on the size, specifications, etc. of the product as described above. Here, the diameter of the suction pipe 5 is set to be large, but this is made of a thick material in advance in order to form a groove in the pipe.

Next, (b) is a process for firstly forming a portion for securing a press allowance required for forming in a step of pretending both ends of the suction pipe. At this time, the pipe is contracted to a predetermined diameter by a swaging jig as shown in the figure.

(C) is a drawing process at both ends, in which both ends of the suction pipe 5 are about 6 mm in diameter and 250 mm to 500 mm in length.
The two end portions are portions corresponding to the small-diameter (small-diameter) pipes 8a (8b) of FIG. 2 of the present invention. First, as a procedure, a jig for forming the material (copper tube) of the suction pipe 5 to a diameter smaller than the diameter of the large diameter pipe 5a is attached to both ends of the large diameter pipe 5a except for the L dimension, and the jig is used. The drawing process is performed to form a small-diameter (small-diameter) pipe. Here, in order to connect between the small-diameter (small-diameter) pipe and the large-diameter pipe, it is necessary to gradually reduce the diameter of the large-diameter portion to the size of the small-diameter (small-diameter) pipe. Therefore, in order to make different diameters with one pipe, a taper portion 9 (inclined portion) is interposed between the large diameter pipe 5a and the small diameter (small diameter) pipes 8a (8b) at both ends as shown in the figure. become. By adopting such a shape, the circulation of the refrigerant in the suction pipe can produce a smooth flow.

Next, (d) is a step of forming a groove over the entire length of the L portion of the central portion (5a) of the suction pipe in the suction pipe grooved drawing step (first time). This working process diagram is a case where two grooves 6 are provided in the suction pipe, and corresponds to FIGS. 5A and 5B in the embodiment of the present invention. The central part 5a is the large diameter pipe of the present invention, and the pipe diameter after drawing with a groove is 8.
It is formed into a size of about 0 to 8.5 mm.

(E) shows a second step in which the capillary tube 3 is fitted into the groove of the suction pipe 5a and then the crimping and drawing is performed. In this step, the capillary 3 is fitted into the longitudinal groove 6 of the suction pipe in the step 3, and the capillary in the groove is subjected to crimping and drawing so as to be wrapped by the suction pipe member constituting the groove. Has become. In this crimping and drawing, the openings of the two grooves are formed to be smaller than the diameter of the capillary by using a special crimping and drawing jig as shown in the figure.
As a result, the capillary is integrally fixed in the suction pipe groove. After the crimping and drawing step of the capillary 3, as described above, the small-diameter (small-diameter) pipe 8 of the procedure 4 is used.
Both ends of the capillary 3 corresponding to a and 8b are tapered portions 9
Gradually becomes an inclined shape from the end.

(F) is a cutting step in which both ends of the suction pipe are cut off and both ends of the capillary are cut off. This completes the assembled shape.

Finally, in a washing process (not shown) of the finished product, the suction pipe assembly is removed from dirt and other components, thereby completing the suction pipe assembly.

As described above, in the manufacturing process of the present invention, a groove for accommodating a capillary in the suction pipe is formed, and the capillary is fitted into the groove, press-fitted and integrated, so that complicated equipment as in the prior art is required. It is possible to produce an assembly with a simple manufacturing process. Therefore, a low-cost product can be provided to the customer.

Next, an embodiment in which the suction pipe assembly 5 completed in (f) above is bent or bent will be described with reference to FIG. (A) is a top view of a bent product, and (B) is (A).
FIG. 3 is an enlarged view of a cross-sectional shape as viewed from XX of FIG. 1, and is an example in which a pipe with a capillary in which a capillary is fitted and housed in a groove 6 formed on the outer periphery of the large-diameter pipe 5a is bent into a predetermined shape. . In (B), the capillary 3 in the groove 6 is inserted into the groove 6 on the horizontal plane at the center 6b of the large diameter pipe 5a.
In this embodiment, the capillary 3 can be bent into a predetermined shape at any position within a circle formed by the diameter of the large-diameter pipe. It is not limited.

Further, in a modification of the embodiment of the present invention shown in FIG. 8, a large-diameter pipe 5a with a capillary in which a capillary 3 is accommodated in a groove 6 formed on the outer periphery of the pipe is parallel to the drawing sheet. To form the desired shape by bending
In this embodiment, a line connecting the center 3b of the capillary 3 accommodated in the inside and the center 6b of the large diameter pipe 5a with a capillary is bent so as to be orthogonal to the paper surface (the surface formed by the curved tube axis). is there. FIG. 8B is a diagram showing FIG.
FIG. 2 is an enlarged view of a cross-sectional shape as viewed from Z.

In this embodiment, as shown in FIG. 8 (B), the bending center 6b of the grooved pipe 5a and the bending center 3b of the capillary 3 are concentric axes as viewed from above in the drawing. The radius (radius of curvature) is the same as the bending radius of the capillary 3. According to this bent shape, stress (elongation and contraction) around the capillary tube 3 and the groove 6 is reduced, and adverse effects such as residual strain and stress concentration on these pipes are reduced. Therefore, during these bending deformations, the contact state between the capillary 3 and the large-diameter pipe 5a and the state of crimping are impaired. For example, a part of the capillary 3 protrudes from the pipe 5a. This suppresses a problem that the heat conduction performance of the slag decreases.

That is, in the present embodiment, even when bending deformation occurs, good contact between the inner surface of the groove 6 and the outer peripheral surface of the capillary tube 3 can be maintained. In this embodiment, the number of the capillaries is one. However, the above-described effect can be obtained also in the case where the groove 6 and the capillaries 3 are provided also at the positions facing the capillaries 3b.

In FIGS. 7 and 8A, the length of each dimension such as the dimension W and the dimension P1 can of course be freely changed by the length of the grooved suction pipe. Although the shape of the present embodiment has one bending number and the bending pitch P1, a combination of a plurality of bending numbers and different bending pitches may be used. Furthermore, in the present embodiment, the arrangement positions of the small-diameter (small-diameter) pipes 8a and 8b are in different directions, but the arrangement positions of these small-diameter (small-diameter) pipes are not limited.

As described above, the suction pipe with a capillary tube has a simple appearance because the capillary tube is accommodated in the groove, so that the bending process can be easily performed and the assembling work on the product side can be easily performed.

As described above, according to the above-described embodiment, the two parts are brought into close contact with each other so that heat can be exchanged between the large-diameter pipe and the capillary pipe without lead soldering. Is also preferred.

Further, since the production equipment for integrating through a bonding material as in the related art is not required, the manufacturing cost can be reduced in terms of cost. Further, since at least 1/2 of the diameter of the capillary tube, preferably at least 2/3 of the diameter of the capillary tube is continuously fitted in the continuous groove of the pipe, the degree of close contact between the two pipes can be made uniform. It is connected.

Further, by drawing both ends of the large-diameter pipe, the size of the small-diameter (small-diameter) pipe suitable for the connection pipe to the product side can be reduced.
Also, the number of parts can be reduced. Also, by reducing the number of welding points, the reliability of the refrigeration cycle can be improved.

A capillary having a diameter equal to the depth of the groove is provided in the groove, and after the capillary is fitted into the groove, the opening of the groove is formed smaller than the diameter of the capillary, so that the capillary is formed. Since it is suitable to be wrapped in the groove of the large diameter pipe, it can be fixed integrally in the groove so that it does not jump out, the joining of both is maintained, the occurrence of a decrease in heat exchange efficiency is suppressed, and the refrigeration cycle Reliability is improved.

Further, the depth of the groove formed in the thick pipe portion is set to the depth to the outer periphery of the small-diameter (small-diameter) pipe portion at both ends, and substantially the entire peripheral surface of the diameter of the capillary tube is fitted into the groove. As a result, the forming process of the groove of the thick pipe can be easily and smoothly performed, and the surface contact between the inner peripheral surface of the groove and the outer peripheral surface of the capillary tube can be performed with heat exchange over the entire length of the grooved pipe in the longitudinal direction. .

Further, since the capillary is disposed so as to be inclined away from the suction pipe as it goes toward the tip from the portion fitted to the large diameter portion of the suction pipe, a refrigeration cycle is constituted. Easy connection with other refrigerant pipes,
Manufacturing becomes easy.

Further, since a taper portion is provided between a thick pipe and a small-diameter (small-diameter) pipe portion, it is possible to form seamless parts having different diameters with one pipe.

Further, since the capillary is mounted in the groove of the thick pipe so as to be within the circle formed by the diameter of the thick pipe, a large contact area between the outer peripheral surface of the capillary and the large diameter pipe can be ensured, and the larger diameter can be obtained. The heat transfer area inside the pipe can be increased,
Since the large diameter pipe wraps almost the entire peripheral surface of the capillary, the refrigerant flowing in the large diameter pipe can exchange heat with almost the entire peripheral surface of the capillary via the thickness of the large diameter pipe.

[0065]

As described above, according to the present invention, a highly reliable refrigeration apparatus can be provided. Further, according to the present invention, it is possible to provide a refrigeration apparatus that can be easily manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically illustrating a configuration of a refrigeration cycle according to a first embodiment of a refrigeration apparatus of the present invention.

FIG. 2 is a sectional view showing a configuration of a suction pipe and a capillary of the refrigeration apparatus shown in FIG.

FIG. 3 is a cross-sectional view showing a contact state between a thick suction pipe and a capillary of the refrigeration apparatus shown in FIG. 2;

FIG. 4 is a longitudinal sectional view showing a schematic configuration of a refrigerator in which the refrigerator shown in FIG. 1 is incorporated.

5 is a cross-sectional view showing a contact state between a large-diameter suction pipe and two capillaries of the refrigeration apparatus shown in FIG.

FIG. 6 is an explanatory view showing a process of fitting a suction diameter pipe and a capillary of the refrigeration apparatus shown in FIG. 1;

FIG. 7 is a view showing a pipe with a capillary which is bent and formed into a predetermined shape in a refrigeration apparatus which is a modification of the first embodiment of the present invention.

FIG. 8 is a diagram showing a capillary-equipped pipe bent and formed into a predetermined shape in a refrigeration apparatus which is another modification of the first embodiment of the present invention.

[Explanation of symbols]

 1 1 compressor 1a compressor connection pipe 2 condenser 3 capillary 3a capillary outer peripheral surface 33 other capillary 4 evaporator 4a evaporator connection pipe 5 suction pipe 5a large diameter pipe 6 groove 6a ‥ Groove inner peripheral surface 66 ‥ The other groove 66a ‥ The other groove inner peripheral surface 7 ‥ Groove opening 8a (8b) ‥ Small diameter (small diameter) pipe portion 9 ‥ Taper portion 29 ‥ Inner box 30 ‥ Outside Box 31 Insulation (urethane foam)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideo Ochiai 800, Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture Within Tochigi Technology Co., Ltd. Inside Tochigi Technology

Claims (6)

[Claims] 1. A refrigeration cycle comprising a compressor, a condenser, a capillary tube, and an evaporator, in which a refrigerant is supplied and circulated in these order, wherein the refrigerant is sucked from the evaporator to the compressor. A large-diameter portion having a large pipe diameter provided in the flowing suction pipe, a small-diameter portion having a small pipe diameter connected to both ends of the large-diameter section, and provided in the large-diameter section along the pipe axis direction of the suction pipe. A refrigerating device, wherein the capillary has a groove accommodated therein, and the inner surface of the groove contacts one half or more of the circumference of the capillary. 2. The refrigeration apparatus according to claim 1, further comprising a connection portion provided in the small diameter portion and connected to a refrigerant pipe through which the refrigerant flows. 3. A taper-shaped portion provided in the suction pipe and formed between the large-diameter portion and the small-diameter portion, and an end of the groove provided in the tapered portion. The refrigeration apparatus according to claim 1, wherein the capillary extends from an end of the groove. 4. A refrigeration cycle comprising a compressor, a condenser, a capillary tube, and an evaporator, in which a refrigerant is supplied and circulated in these order, wherein the refrigerant is sucked from the evaporator toward the compressor. A groove provided in the flowing suction pipe along the pipe axis direction of the suction pipe, wherein the capillary is fitted to a depth of at least half the diameter of the pipe, and a groove in the pipe axis direction of the capillary of the groove. A refrigerating device having a width smaller than the diameter of the capillary. 5. The refrigerating apparatus according to claim 1, wherein the groove has a shape such that a width of the groove decreases from a pipe axis of the suction pipe toward an outer peripheral direction thereof. 6. The refrigerating apparatus according to claim 1, wherein said capillary is attached so as to extend in a direction away from said suction tube from an end of a portion fitted into said groove.