KR20020096849A - Refrigerating device - Google Patents

Abstract

PURPOSE: To provide a refrigerating device, being high in reliability, at a low cost. CONSTITUTION: 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

Refrigeration unit {REFRIGERATING DEVICE}

The present invention relates to a refrigerating device that compresses and cools refrigerant such as a refrigerator and a freezer dehumidifier.

In a conventional refrigeration cycle such as a refrigerator, the 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 tube connected to the condenser, where it is reduced in pressure and a low temperature low pressure gas and liquid. Becomes a mixed refrigerant. And it flows in into an evaporator from a capillary tube. Here, it heat-exchanges with the outside of an evaporator, becomes a gas, and forms the cycle structure which returns to a compressor again through the suction pipe | tube of the refrigerant | coolant to a compressor after that. Here, in order to improve the effective freezing capacity of the refrigeration cycle and to save energy in a refrigerator or the like, the suction pipe and the capillary are joined to each other outer circumferential surface by using a bonding material (for example, soldering), and heat conducting through the solder. It is generally performed to allow heat exchange.

In this technique, the above-described configuration reduces the volume of the refrigerant passing through the suction pipe into the compressor by heat exchange with the refrigerant in the capillary tube, thereby improving the compression efficiency in the compressor. In such a conventional technique, as in the case of a normal home refrigerator, when the evaporation temperature is a refrigerant cycle around -30 deg. C, for example, the efficiency can be improved by about 10 to 15%.

In the refrigeration cycle as described above, solder is used as a joining material to bring the two pipes into contact. However, the use of solder has been pointed out problems such as corrosion caused by oxidation of chloride contained in the solder and moisture entering the junction between the solder and the tube, corrosion caused by potential difference, or destruction caused by vibration of the joint. Then, as one of the techniques which solve such a subject, the technique described in Unexamined-Japanese-Patent No. 55-159975 (Japanese Utility Model Application No. 54-059879) (prior art) is known.

In this prior art, the capillary tube is arranged along the concave portion provided in the longitudinal direction of the pipe constituting the suction pipe, and the foamed polyethylene resin is applied around the two tubes disposed adjacent to each other and then cured. In addition, this configuration does not use solder, and is intended to solve the problem of being undesirable in terms of hygiene and environment by using lead components contained in the solder.

In the above prior art, irregularities are likely to occur in the degree of contact, unless the working precision of the concave portion formed when the suction tube and the capillary tube are brought into contact with each other, resulting in a decrease in the freezing capacity. In order to increase the work accuracy for forming the recess, the prior art has not considered the problem that the manufacturing cost increases.

Moreover, in the structure similar to the prior art, the cross-sectional area of the suction pipe is reduced by the recess provided in the tube diameter of the same suction pipe, so that the flow resistance of the refrigerant flowing through the suction pipe increases in that state. Therefore, although it is possible to consider increasing the pipe diameter of the suction pipe provided with the concave portion, a relay pipe is added to both ends of the suction pipe provided with the concave portion, and the connection with the pipes of other refrigeration cycles having different pipe diameters is performed. Therefore, assembling of the pipe including the suction pipe into the unit product is performed by assembling the relay pipe together with the capillary to the suction pipe side before assembly. For this connection, welding, crimping, enlarged tubes, etc., which enlarge the tube diameter, can be considered.

In the said prior art, in consideration of the connection of such pipes, there is no consideration about the structure which is easy to manufacture efficiently, and can reduce cost. In addition, the problem that the welding part increases by the addition of a relay pipe and the reliability falls is not considered.

It is an object of the present invention to provide a highly reliable refrigeration apparatus at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing an outline of a refrigeration cycle configuration according to a first embodiment of a refrigeration apparatus of the present invention.

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

3 is a cross-sectional view showing a contact state between a suction large diameter pipe and a capillary tube of the refrigerating device shown in FIG. 2;

4 is a longitudinal sectional view showing a schematic configuration of a refrigerator in which the refrigerating device shown in FIG. 1 is assembled;

Fig. 5 is a cross sectional view showing a contact state between a suction large diameter pipe and two capillaries of the refrigerating device shown in Fig. 1;

FIG. 6 is an explanatory diagram showing a step of fitting a suction large diameter pipe and a capillary tube of the refrigerating apparatus shown in FIG. 1; FIG.

Fig. 7 shows a capillary-attached pipe bent into a predetermined shape of a refrigerating device, which is a modification of the first embodiment of the present invention.

Fig. 8 shows a capillary-attached pipe bent to a predetermined shape of a refrigerating device, which is another modification of the first embodiment of the present invention.

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

1: compressor

1a: compressor connecting pipe

2: condenser

3, 33: capillary

3a: capillary outer peripheral surface

4: evaporator

4a: evaporator connection pipe

5: suction pipe

5a: large diameter pipe

6, 66: home

6a, 66a: Inner groove

7: opening of the groove

8a, 8b: small diameter (thin diameter) pipe

9: tapered portion

29: inner box

30: outer box

31: heat insulation material (urethane foam material)

The above object is a refrigeration cycle having a compressor, a condenser, a capillary tube, and an evaporator, in which a refrigerant is supplied and circulated in this order, wherein the refrigerant is installed in a suction tube flowing from the evaporator toward the compressor and having a large tube diameter. A neck portion, a small diameter portion having a small diameter connected to both ends of the large diameter portion, and a groove provided in the large diameter portion along the tube axis direction of the suction pipe, the capillary being accommodated therein, and the surface inside the groove having the surface of the capillary Achieved by a refrigeration unit in contact with at least one half of the circumference of the tube.

Moreover, it is achieved by providing the connection part provided in the said narrow diameter part and connected to the refrigerant pipe through which the said refrigerant flows.

Moreover, it is achieved by having the taper-shaped part provided in the said suction pipe and formed between the said large diameter part and the said narrow diameter part, and the edge part of the said groove provided in this taper shape part, and the said capillary tube extending from the end part of this groove | channel.

A refrigeration cycle is provided with a compressor, a condenser, a capillary tube, and an evaporator, and the refrigerant is supplied and circulated in this order, and the refrigerant is installed in the suction tube flowing from the evaporator toward the compressor, along the direction of the tube axis of the suction tube. The capillary tube has a groove fitted to a depth of 1/2 or more of the tube diameter, and the width of the groove in the tube axis direction of the capillary tube of the groove is achieved by a refrigerating device having a smaller diameter than the tube diameter of the capillary tube.

Further, the groove is achieved by having a shape in which the width of the groove decreases from the tube axis of the suction pipe toward its outer circumferential direction.

In addition, the capillary is achieved by extending in the direction of separation from the suction pipe from the end of the portion fitted into the groove.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described using drawing.

1 is a block diagram showing a schematic configuration of a refrigeration cycle according to the first embodiment of the refrigeration apparatus of the present invention. In Fig. 1, reference numeral 1 denotes a compressor, reference numeral 2 denotes a condenser, reference numeral 3 denotes a capillary tube, reference numeral 4 denotes an evaporator and reference numeral 5 denotes a suction pipe. The refrigerant circulates in the order of → 2 → 3 → 4 → 5, and has a cycle configuration of returning to the compressor 1 again.

2 and 3 are diagrams for explaining the components of the suction pipe and the capillary. FIG. 2 is a view for explaining the configuration of the suction pipe 5 and the capillary tube 3 shown in FIG. FIG. 3 is a cross-sectional view showing the contact in the YY cross section of the suction pipe and the capillary tube shown in FIG. 2, and in particular, FIG. 3 (b) shows that the capillary tube 3 is inserted into the groove 6 of FIG. It is sectional drawing which shows the process in the middle before fitting. 4 is a longitudinal sectional view showing a schematic configuration of a refrigerator in which the refrigerating device shown in FIG. 1 is assembled.

In this embodiment, the diameter of the central part of the suction pipe 5 is about 8 to 8.5 mm. Here, the diameter of the suction pipe 5 is made larger than the tube diameter of the refrigerant pipe constituting another refrigeration cycle. The reason for this is to reduce the output value of the compressor by reducing the flow path resistance of the refrigerant flowing in the refrigerating cycle during the operation of a refrigerating cycle such as a refrigerator, so as to reduce the power consumption of the refrigerator.

Small-diameter (thin) pipes 8a and 8b are formed at both ends of the large-diameter pipe 5a to be used between the compressor 1 and the evaporator 4 via a taper 9. And the pipe diameter of this both ends is formed about 6 mm in diameter through the front taper part 9. And these small diameter (thin diameter) pipes 8a and 8b are connected to the compressor connection pipe 1a of the refrigerator side, and the evaporator connection pipe 4a of the evaporator side like FIG. 4 mentioned later. In addition, the sizes of the small-diameter (thin diameter) pipes 8a and 8b can be changed to the size of the connection pipe on the product side, and are not limited to the previous 6 mm. In other words, the sizes of the small-diameter (thin diameter) pipes 8a and 8b can be formed into desired diameters via tapered portions. Moreover, in the taper part 9 of the said large diameter pipe 5a, since it has a taper shape between different diameters etc., the refrigeration cycle structure which can be circulated smoothly without impairing the flow path resistance of the refrigerant which flows inside a pipe. It is.

The reason why the pipe diameter of the suction pipe is larger than the pipe diameter on the refrigeration cycle component side is to improve the refrigerating capacity by reducing the suction output flow path resistance in the pipe of the refrigeration cycle and suppressing the output value of the compressor. Therefore, the refrigerating capacity of the refrigerator and the like is secured by the synergistic effect of the combination of the heat exchange length by the contact between the capillary tube and the suction pipe and the inner diameter value of the suction pipe (the size of the suction side cross-sectional area).

Moreover, in the longitudinal direction of the said large diameter pipe 5a part, as shown in FIG.2, FIG.3, the groove 6 which is a recessed part provided in the inner direction of the pipe is formed, and the groove 6 of this large diameter pipe 5a is formed. ), The capillary tube 3 is continuously fitted in the length of L value. The fitting is fitted over a size of 1/2 or more, preferably 2/3 or more of the tube diameter of the capillary with respect to the tube axis direction (depth direction) of the large diameter pipe 5a of the groove. And the surface of the large diameter pipe 5a inside the groove 6 is viewed in a cross section perpendicular to the axial direction of the pipe, so that it is in contact with at least 1/2 of the outer peripheral surface of the capillary tube 3, preferably at least 2/3. Doing. In addition, in the structure of this embodiment, the surface which contacts the capillary tube 3 inside the groove | channel of the large diameter pipe 5a is inclined so that the width | variety of a groove | channel may become small, as the direction of the groove | channel depth of the capillary tube 3 becomes shallow. . That is, the widthwise shape of the grooves of the capillary tube 3 is in contact with the inner surface of the groove of the large-diameter pipe 5a at the surface of the capillary tube 3 of the shape portion which is smaller or inclined as the direction of the groove depth becomes shallower. Doing. In other words, the width direction of the capillary groove has a portion smaller than the minimum size of the contact surface distance between the width width of the groove and the tube axis direction (the axial direction of the groove).

With such a configuration, the large diameter pipe 5a and the capillary tube 3 are secured to be in close contact with each other, and the contact area between them is increased to fix the heat exchange efficiently. Therefore, these pipes are maintained in a proper contact state so as to be heat exchanged even without a sealing material such as a bonding material (solder material) or a resin to be fixed from the outside as in the prior art. In addition, since there is no joining member between them, deterioration such as corrosion due to ingress of moisture or the like and destruction due to vibration can be suppressed.

Next, the assembly structure of the groove | channel 6 of the large diameter pipe 5a and the capillary tube 3 is demonstrated. In FIG. 3A, the depth h1 of the groove 6 formed in the large diameter pipe 5a is set to reach the outer periphery of the small diameter (thin diameter) pipes 8a and 8b formed at both ends. The depth of the groove 6 may be smaller than this (depth not reaching 8a, 8b). The groove 6 is provided so that 1/2 or more, preferably 2/3 or more, of the tube diameter of the capillary tube 3 is fitted. In the present embodiment, the outer circumferential surfaces of the small-diameter (thin diameter) pipes 8a and 8b coincide with the extension of the line connecting the lowermost part of the depth 6 of the groove 6 continuous in the longitudinal direction. As a result, it is easy to produce the draw-molding process of the groove 6 of the large-diameter pipe 5a, and the contact area between the capillary tube 3 and the suction pipe 5 increases, making it difficult to peel off. At the same time, the thermal conduction performance is improved.

Next, the refrigeration cycle structure when the suction pipe assembly shown above is assembled to the refrigerator side is shown in FIG. In Fig. 4, reference numeral 5 denotes a suction pipe connected between the compressor 1 and the evaporator 4, in which a large diameter pipe 5a is provided at the center of the suction pipe 5 together with a capillary tube 3, and an inner box 29. And embedded in the heat insulating material 31 filled between the outer box (30). As described above, the diameter of the large diameter pipe 5a is roughly about 8 to 8.5 mm, and the upper and lower ends of the large diameter pipe 5a are arranged as shown in the small diameter (thin diameter) pipes 8a and 8b formed by throttling. It is. As for the diameter of these small diameter (thin diameter) pipes, about 6 mm is preferable. As for the pipe diameter of cycle components, such as a refrigerator, about 6-6.5 mm in diameter is used. Therefore, the pipe diameter of the both ends of the large diameter pipe 5a used between the compressor 1 and the evaporator 4 is shape | molded to about 6 mm, and it is set as the structure which can be directly connected with each cycling component from the product side. In the drawings, A and B denote connection portions between the small-diameter (thin) pipes 8a and 8b, the evaporator connecting pipe 4a on the evaporator 4 side and the compressor connecting pipe 1a on the compressor 1 side, respectively, in the refrigerator. Illustrated.

3A is a cross-sectional view of the assembly structure of the large-diameter pipe 5a and the capillary tube 3, wherein the capillary tube 3 having a depth h1 of the groove 6 as the diameter is the groove 6 It is a structure installed inside. And the numerical value of the groove | channel 6 opening part h3, ie, the minimum value of the width | variety of the groove | channel 6 in the outer periphery of the large diameter pipe 5a, is set as the numerical value of the tube diameter d1 of the capillary tube 3, or the capillary tube ( 3) Compression is formed so that the numerical value in the width direction of the groove is smaller than the maximum value, the surface of the capillary tube 3 is pressed against the outer circumferential surface of the large-diameter pipe 5a, and the capillary tube disposed in the groove 6 is contacted. (3) does not protrude from the inside of the groove 6 of the large diameter pipe 5a.

In further detail, the center 3b of the capillary tube 3 is located at a height ho at a half position of the depth h1 of the groove, and the lower side is a semicircle of the capillary tube with respect to the horizontal plane of the center 3b. It is shaped. And the groove inner peripheral surface 6a of the groove | channel 6 same as this semicircle shape is formed so that it may correspond.

In this way, the groove inner circumferential surface 6a is not less than half the outer circumference of the capillary tube 3 1/2 or 2/3 of the capillary tube 3 at the end of the capillary tube 3 when the capillary tube 3 is fitted. There is surface contact over the length. That is, over the length L, the outer peripheral surface of the capillary tube 3 is contacted so that 1/2 or more or 2/3 or more may be enclosed by the surface of the groove inner peripheral surface (concave part) 6a of the large diameter pipe 5a.

Next, on the horizontal surface upper side of the center 3b of the capillary tube 3, the large diameter pipe 5a is compressed and formed, and then the ridge line of the opening of the groove 6 is the center 3b of the capillary tube 3 in the height direction. ) And the contact point 3c of the capillary outer circumference and the large diameter pipe outer circumference, and reference numerals 6d and 6d in the figure become the opening size h3 of the groove. Therefore, the opening numerical value h3 of the groove | channel 6 is compressed and shape | molded so that it may become smaller than the d1 value of a capillary tube, and the contact area of two pipe surfaces will become large, and both pipes will be fixed firmly.

Next, the shape before pressing these capillaries will be described with reference to Fig. 3 (b). The ridge lines of the openings of the grooves 6 before molding (compression and contacting both) are equal to the opening width h2 (capillary tube diameter d1). For the height position, the opening ridges 6c and 6c are respectively formed at the height position of the h4 value in FIG. 3 (b) between the center 3b of the capillary tube 3 and the outer circumferential contact 3c. have. At this position, the capillary tube 3 inside the groove 6 is fitted, and then the capillary tube 3 is crimped out to the large-diameter pipe 5a to thereby open the ridges 6c and 6c of the groove 6. The capillary tube 3 is pressed against the capillary outer circumferential surface 3a and pressed.

3 (a), the opening ridges 6c and 6c move to the capillary outer circumferential surface 3a above the horizontal plane of the center 3b of the capillary tube 3, and after the crimping and pulling process, the positions 6d and 6d are shown. The capillary tube 3 is fixed so as to be enclosed in the groove 6 over at least 1/2, preferably at least 2/3 of the capillary tube diameter. Therefore, on the basis of the horizontal plane of the capillary tube 3, the upper side is the groove inner circumferential surface 6a of the groove 6 up to the outer circumferences 6d and 6d of the capillary tube 3 (1/2 or 2/3 or more of the circumference of the capillary tube) ) Is in surface contact with At this time, the height position of outer periphery 6d, 6d is h5 (FIG. 3 (a)), and becomes lower than h4 before crimping | compression-bonding. That is, since 1/2 or 2/3 or more of the pipe diameter of the capillary tube 3 can be continuously pressed into the groove 6 of the longitudinal direction in the groove of the large diameter pipe 5a, the large diameter pipe 5a and the capillary tube 3 It is possible to perform good heat exchange between them.

Here, in FIG. 2 (b), the shape after the capillary tube 3 is compressed from the state where the capillary tube 3 is fitted into the groove 6 of the large diameter pipe 5a (Fig. 2 (a)). Explain. In FIG. 2 (b), the lowermost surface of the groove 6 of the large diameter pipe 5a is flush with the outer circumferential surfaces of the small diameter (thin diameter) pipes 8a and 8b at both ends, and the capillary tube 3 is formed in the groove 6. ), And the capillary tube 3 is crimped and pulled into the groove 6 of the large-diameter pipe 5a to form the shape as shown in Fig. 2A.

In Fig. 2A, both end portions of the capillary tube 3 are inclined in a direction separated from the outer circumferential surface of the suction pipe 5 with the taper portion 9 as a boundary. This is the boundary between the groove 6 and the portion of the large-diameter pipe 5a without the groove 6 when the groove 6 joins the capillary 3 as described above (the end of the groove) between the L values of the groove 6. In the portion of the tapered portion 9, the capillary tube 3 from the small-diameter (narrow) pipes 8a, 8b is directed from the tapered portion 9 toward the distal end of the capillary tube 3 by an applied force. The top end of (3) is lifted and deformed in the direction of separation. For this reason, it becomes the shape which inclines toward the front-end | tip part of the capillary tube 3 with the taper part 9 as a boundary.

In the prior art, at the time of assembling the refrigeration cycle to the refrigerator, in the state of the assembly combined with the suction pipe to connect with the connection pipe on the refrigeration cycle side, a work step of separating both end portions of the capillary tube from the suction pipe and inclining it in advance Was doing. By this inclination, space | interval between pipes can be created and the space for welding and connection work of a pipe can be secured. On the other hand, in the present embodiment, the capillary is inclined to be separated from the suction pipe in the step of the compression drawing process of the capillary tube as described above, so that these processes are unnecessary in the configuration of the present invention, and the efficiency of the manufacturing process of the suction pipe assembly is improved. The manufacturing cost is reduced.

3 (b) shows the cross-sectional shape before the capillary tube 3 is press-fitted to the groove 6 of the large diameter pipe 5a as described above, and as shown, the groove of the large diameter pipe 5a The opening numerical value h2 of (6) is equal to the pipe diameter d1 of the capillary tube 3. Accordingly, when the capillary tube 3 enters the groove 6, the groove inner circumferential surface 6a in the groove 6 coincides with the capillary outer circumferential surface 3a. Then, the capillary tube 3 is fitted into the groove 6 (Fig. 3 (b)), and then the opening numerical value h2 of the groove 6 is larger than the tube diameter d1 of the capillary tube 3 as described above. The groove inner circumferential surface 6a in the groove 6 of the large-diameter pipe 5a over approximately the entire circumferential surface (more than 2/3 of the tube diameter) of the capillary tube 3 by press molding with a small h3 (Fig. 3 (a)). It joins so that it may be enclosed, and adhesion | attachment becomes more tight and it becomes the structure which can enlarge a contact area.

Therefore, the large diameter pipe 5a and the capillary tube 3 can exchange heat by surface contact with the outer peripheral surfaces 3a and 6a. In addition, in the inner surface of the groove 6, the capillary tube 3 is shaped to surround the large diameter pipe 5a, so that the refrigerant flowing in the large diameter pipe 5a passes through the thickness of the large diameter pipe 5a in the longitudinal direction. It is possible to exchange heat at an outer surface larger than the capillary tube 3 disposed in the groove. In such a technique of heat exchange, it is possible to secure the necessary freezing capacity of a refrigeration cycle such as a refrigerator without using a bonding material (solder material) that has been conventionally used, and at the same time, to save energy.

Moreover, since two parts can be joined together without a bonding material, it is hygienic and environmentally preferable. In addition, since it is possible to eliminate the need for a complicated device or equipment by using no bonding material, the cost of the product can be reduced. In addition, by fitting integrally molded parts (capillary tubes) in a pipe groove having a certain shape, the degree of contact or adhesion between the two parts can be made uniform, thus improving the freezing ability of the product and providing a highly reliable product to the customer. It can be provided.

5A shows another groove 66 having the same shape as the groove 6 on the opposite side (symmetrical position of the groove 6) of the groove 6 formed in the large diameter pipe 5a. An Example is shown. The manufacturing method of this embodiment is performed in the same process sequence as in Fig. 6 described later.

That is, the jig for forming small diameter (thin diameter) pipes 8a and 8b is provided in both ends except the L value of the large diameter pipe 5a. Thereafter, the grooves 6 and 66 are formed in the large diameter pipe portion 5a by drawing. Thereafter, the capillary tubes 3 and 33 are fitted into the grooves, and the capillary tubes 3 and 33 are pressed and drawn out to the large-diameter pipe 5a. In addition, the inside of the groove 66 of this embodiment is the same structure (same shape) as FIG.3 (a), and the depth h1 of the groove 66 is of the small diameter (thin diameter) pipe 8a, 8b formed in both ends. The capillary tube 33 is fitted into the groove 66 at a depth to the outer circumference.

By attaching the capillary tube into the groove of the thick pipe so as to be put in the circle made by the thick pipe, the contact area between the outer circumferential surface of the capillary tube and the outer circumferential surface of the thick pipe is secured over the entire length of the grooved pipe. can do. In addition, since the heat transfer area on the inner circumferential surface side of the thick pipe can be increased by forming a groove (concave portion) in the thick pipe, the refrigerant flowing in the large diameter pipe between the capillary and the thick pipe between the capillaries Since it can heat-exchange with a wide outer peripheral surface, heat exchange amount can be performed largely and efficiently. In addition, since the capillary tube can be integrated in the circle of the large diameter pipe, the finished appearance of the suction pipe assembly is simplified, and the assembling work of the product becomes easy. In addition, since the two parts are integrated without a bonding material, the assembly itself is lighter.

Next, Fig. 5B shows a cross-sectional shape before the two capillary tubes 3, 33 are compressed and fixed in the grooves 6, 66 of the large diameter pipe 5a. This figure is an embodiment in which the groove 66 of the same shape as the groove 6 of FIG. 3 (b) mentioned above is installed on the opposite side (symmetrical position of the groove 6), and in the groove 66 The groove inner circumferential surface 66a is made to coincide with the outer circumferential surface 33a of the capillary tube 33.

Next, a method of manufacturing the suction pipe and the capillary tube of the present invention will be described with reference to FIG. In the figure, the left side shows the shape seen from the left side, and the right side shows the whole process figure.

First, Fig. 6A is a raw material (copper pipe) of the refrigeration cycle of this embodiment, the upper part of which is a suction pipe 5 and the lower part of a capillary tube 3, and the diameter of the pipe 5 is 12 mm to 13 mm. It is a coarse material in mm, and its length is, for example, about 2500 to 3000 mm. In addition, about the magnitude | size of this diameter and the length of a longitudinal direction, it changes with a magnitude | size of a product, a specification, etc. Moreover, the outer diameter of the capillary tube 3 is 1.8 mm-2.0 mm, and the length is about 3000 mm, for example. The length of the capillary tube 3 also changes depending on the size, specifications, and the like of the same product. Although the diameter of the suction pipe 5 is set large here, this is made of a thick material in advance to form a groove in the pipe.

Next, Fig. 6 (b) is a first step of preliminarily forming the both ends of the suction pipe 5 at the end, thereby securing a pressing portion necessary for forming. What is used at this time is condensed to a constant diameter by the swaging jig as shown.

Fig. 6 (c) is a step end throttling step, in which both ends of the suction pipe 5 are molded to a diameter of about 6 mm and a length of 250 mm to 500 mm, and both ends thereof are the small diameters (fine diameters) of Fig. 2 of the present invention. ) Corresponds to the pipes 8a and 8b. First, as a procedure, the raw material (copper pipe) of the suction pipe 5 attaches the jig for shaping to a diameter smaller than the diameter of the previous large diameter pipe 5a at both ends except the L value of the large diameter pipe 5a. The zigzag processing is performed by a jig to form the small diameter (thin diameter) pipe 5a. Here, in order to connect between the small diameter (thin diameter) pipes 8a and 8b and the large diameter pipe 5a, it is necessary to gradually reduce the diameter of the large diameter portion to make the sizes of the small diameter (thin diameter) pipes 8a and 8b. Therefore, in order to make another diameter with one pipe, the taper part 9 (inclined part) is interposed between the said large diameter pipe 5a and the small diameter (thin diameter) pipes 8a and 8b of both ends as shown. By such a shape, circulation of the refrigerant | coolant in the suction pipe 5 can also make smooth flow.

Next, Fig. 6D is a step of forming the groove 6 over the entire length of the central portion 5a L numerical value portion of the suction pipe 5 in the groove forming drawing process (first time) of the suction pipe 5. to be. In addition, this process process drawing is a case where the two groove | channels 6 are provided in the suction pipe 5, and correspond to FIG. 5 (a), (b) in the Example of this invention. In the large diameter pipe 5a of this invention, the center part is shape | molded to the diameter of the pipe after groove formation drawing about 8.0-8.5 mm.

FIG. 6E shows the second process of performing crimping after fitting the capillary tube 3 into the groove of the suction pipe 5. This process fits the capillary tube 3 into the groove | channel 6 of the longitudinal direction to the suction pipe of step 3, and the suction pipe 5 which is a member which comprises the capillary tube 3 in this groove | channel 6 comprises the groove | channel 6 It is a process of performing crimping pultrusion so that it may be enclosed by the member of. In this crimping drawing, the openings of the two grooves 6 and 66 are formed smaller than the pipe diameters of the capillary tubes 3 and 33 by a dedicated crimping drawing jig as shown. The capillary tubes 3, 33 are thereby fixed integrally in the groove 6 of the suction pipe 5. After the crimping and pulling process of the capillary tube 3, both end portions of the capillary tube 3 corresponding to the small-diameter (thin tube) pipes 8a and 8b of step 4 as described above are inclined more slowly than the ends of the tapered portion 9. Becomes

Fig. 6F is a step of cutting, in which both ends of the preliminary forming portion of the suction pipe 5 are cut, and both ends of the capillary tube 3 are cut. This completes the assembly shape.

Finally, the suction pipe assembly is completed by removing dirt and others from the suction pipe assembly in a cleaning process (not shown) of the finished product.

As described above, in the manufacturing process of the present invention, the groove 6 for inserting the capillary tube 3 into the suction pipe 5 is made, and the capillary tube 3 is fitted into the groove 6 to be compressed and integrated. The assembly can be made in a simple manufacturing process without the need for complicated equipment. Therefore, it is possible to provide a low cost product to the customer.

Next, an embodiment in which the suction pipe assembly 5 completed in (f) is bent or bent is described with reference to FIG. (A) is a top view of a bent molded article, (B) is an enlarged view of the cross-sectional shape seen from XX of (A), and the capillary tube 3 is inserted in the groove 6 formed in the outer peripheral part of the large diameter pipe 5a. This is an embodiment in which a pipe with a capillary tube 3 accommodated together is bent and molded into a predetermined shape. In (B), the capillary tube 3 in the groove 6 is an embodiment in which the capillary tube 3 is disposed in the groove 6 on the horizontal plane of the center 6b of the large diameter pipe 5a. As for the position of, any position can be bent and formed into a predetermined shape as long as the diameter of the large-diameter pipe 5a is made, and the present invention is not limited to this embodiment.

In addition, a modification of the embodiment of the present invention shown in Fig. 8 is formed by bending a large diameter pipe 5a with a capillary tube having the capillary tube 3 in a groove 6 formed in the outer periphery of the pipe to be parallel to the ground of the drawing. When making the desired shape, the line connecting the center (3b) of the capillary (3) accommodated in the groove (6) and the center (6b) of the large diameter pipe (5a) with a capillary tube is the surface (bent tube axis is formed) Is an embodiment bent and formed so as to be perpendicular to the Fig. 8B is an enlarged view of the cross-sectional shape of Fig. 8A viewed from Z-Z.

In this embodiment, as shown in Fig. 8B, the bending center 6b of the grooved large diameter pipe 5a and the bending center 3b of the capillary tube 3 are concentric shafts as seen from above in the drawing. The bending radius (curvature radius) of the pipe 5a is the same as the bending radius of the capillary tube 3. According to this bending shape, the stresses (relaxation and contraction) around the capillary tube 3 and the grooves 6 become small, and the adverse effects such as the residual distortion of these pipes and the concentration of stresses are reduced. For this reason, when performing these bending deformations, the contact state of the capillary tube 3 and the large diameter pipe 5a, and the crimping | compression-bonding state are damaged, for example, a part of the capillary tube 3 protrudes from the large diameter pipe 5a, It is suppressed that a problem such as deterioration of the heat conduction performance in this portion occurs.

That is, in this embodiment, even if bending deformation is performed, the contact between the inner surface of the groove 6 and the outer peripheral surface of the capillary tube 3 can be maintained satisfactorily. In the present embodiment, the capillary tube 3 is one case, but the above-described effect can also be obtained in the case where the groove 6 and the capillary tube 3 are provided in the position where the capillary tube 3b faces.

7 and 8 (A), the length of each numerical value, such as W value and P1, can be changed freely by the length of the grooved suction pipe 5, of course. In addition, although the shape of this embodiment has bending number P1 with one bending number, the combination which differs in bending pitch may be sufficient as two bending numbers. In addition, although the arrangement positions of the small diameter (thin diameter) pipes 8a and 8b are different directions in this embodiment, they are not limited to the installation position of these small diameter (thin diameter) pipes 8a and 8b and the like.

As described above, since the capillary tube 3 is housed in the groove 6, the suction pipe 5 with the capillary tube has a simple appearance, which makes it easy to process bending and processing of the product.

As described above, according to the above embodiment, the two parts are brought into close contact with each other so that heat exchange can be performed between the large diameter pipe 5a and the capillary tube 3 without soldering.

In addition, since the production equipment for integrating through the bonding material is unnecessary as in the prior art, the manufacturing cost can be reduced in cost. In addition, since a half or more, preferably 2/3 or more, of the capillary tube diameter is continuously inserted into the continuous grooves of the pipes, the degree of adhesion between the two pipes can be made uniform, thereby improving the freezing ability of the product. It is followed.

In addition, since both ends of the large-diameter pipe 5a are throttled, the diameters of the small-diameter (thin-diameter) pipes 8a and 8b matched to the connection pipes to the product side can be obtained, thereby eliminating the need for a relay pipe and the number of parts. Reduction is planned. In addition, by reducing the welding area, the reliability of the refrigeration cycle can be improved.

In addition, after the capillary tube 3 having the depth of the groove 6 is disposed in the groove 6 and the capillary tube 3 is fitted into the groove 6, the opening of the groove 6 is closed by the capillary tube 3. Since the capillary tube 3 is shaped to be surrounded by the groove 6 of the large-diameter pipe 5a, it can be fixedly attached to the groove 6 so as not to protrude so that the bonding between the two is maintained. The occurrence of a decrease in heat exchange efficiency is suppressed and the reliability of the refrigeration cycle is improved.

In addition, the depth of the groove 6 formed in the thick pipe part is set to the depth to the outer periphery of the small diameter (thin diameter) pipes 8a and 8b of both ends, and in this groove 6 approximately the entire peripheral surface of the capillary tube diameter Since the fitting process is easy and smooth, the surface contact between the inner circumferential surface of the groove and the outer circumferential surface of the capillary tube 3 can be formed over the entire length of the grooved pipe. Heat exchange can be performed.

In addition, since the capillary tube 3 is disposed to be inclined to be separated from the suction pipe 5 toward the tip portion thereof rather than the portion fitted to the larger diameter portion of the suction pipe 5, the capillary tube 3 is different from the other freezing tube constituting the refrigeration cycle. Connection can be performed easily, and manufacture becomes easy.

Moreover, since the taper part 9 was provided between the large diameter pipe and the small diameter (thin diameter) pipe 8a, 8b, it became possible to shape the seamless part with a different diameter from one pipe.

Moreover, since the capillary tube 3 put in the circle made by the diameter of a thick pipe was affixed in the groove | channel 6 which a thick pipe has, the contact area between the outer peripheral surface of the capillary tube 3 and the large diameter pipe 5a can be ensured large, In addition, since the heat transfer area in the large pipe can be increased, and the large diameter pipe 5a is enclosed around the entire circumferential surface of the capillary tube 3, the refrigerant flowing in the large diameter pipe 5 increases the thickness of the large diameter pipe 5a. It can exchange heat with approximately the entire circumferential surface of the capillary tube 3 through.

As described above, the present invention can provide a highly reliable refrigeration apparatus. In addition, the present invention can provide a refrigeration apparatus that is easy to manufacture and can be manufactured at low cost.

Claims (7)

A refrigeration cycle comprising a compressor, a condenser, a capillary tube, and an evaporator, in which refrigerant is supplied and circulated in these orders, The refrigerant is provided in a suction tube flowing from the evaporator to the compressor, and has a large diameter portion having a large tube diameter, a small diameter portion having a small tube diameter connected to both ends of the large diameter portion, and a large diameter portion in the tube axis direction of the suction tube. And a groove in which the capillary tube is accommodated therein, the inner surface of the groove contacting at least 1/2 of the circumference of the tube of the capillary tube. The refrigeration apparatus according to claim 1, further comprising a connection portion provided in the narrow diameter portion and connected to a refrigerant pipe through which the refrigerant flows. A refrigeration cycle comprising a compressor, a condenser, a capillary tube, and an evaporator, in which refrigerant is supplied and circulated in these orders, The refrigerant is provided in a suction tube flowing from the evaporator to the compressor, and has a large diameter portion having a large tube diameter, a small diameter portion having a small tube diameter connected to both ends of the large diameter portion, and a large diameter portion in the tube axis direction of the suction tube. An end of the groove having a groove provided along the capillary and accommodated therein, a tapered portion provided in the suction pipe and formed between the large diameter portion and the narrow diameter portion, and an end portion of the groove provided in the tapered portion, And the capillary tube extends from the inner surface of the groove in contact with at least 1/2 of the circumference of the capillary tube. A refrigeration cycle comprising a compressor, a condenser, a capillary tube, and an evaporator, in which refrigerant is supplied and circulated in these orders, The refrigerant is provided in a suction tube flowing from the evaporator to the compressor, and has a large diameter portion having a large tube diameter, a small diameter portion having a small tube diameter connected to both ends of the large diameter portion, and a large diameter portion in the tube axis direction of the suction tube. A groove formed along the capillary tube to accommodate the inside of the capillary tube, a connecting portion provided in the narrow diameter portion and connected to a refrigerant tube through which the refrigerant flows, and a tapered portion provided in the suction pipe and formed between the large diameter portion and the narrow diameter portion; And an end portion of the groove provided in the tapered portion, wherein the capillary tube extends from the end portion of the groove so that the inner surface of the groove contacts 1/2 or more of the circumference of the tube of the capillary tube. A refrigeration cycle comprising a compressor, a condenser, a capillary tube, and an evaporator, in which refrigerant is supplied and circulated in these orders, The refrigerant is installed in the suction pipe flowing from the evaporator toward the compressor along the direction of the tube axis of the suction pipe, and the capillary tube has a groove fitted to a depth of 1/2 or more of the diameter of the groove. The width | variety of a tube axis direction groove | channel is smaller than the diameter of the said capillary tube, The refrigeration apparatus characterized by the above-mentioned. 6. The refrigerating device according to any one of claims 1 to 5, wherein the groove has a shape in which the width of the groove decreases as it faces outward from the tube axis of the suction pipe. The refrigerating device according to any one of claims 1 to 5, wherein the capillary tube is extended and attached in a direction to be separated from the suction tube from an end portion of a portion fitted into the groove.