WO2001096773A1

WO2001096773A1 - Communication piping unit and refrigerating device using the unit

Info

Publication number: WO2001096773A1
Application number: PCT/JP2001/003393
Authority: WO
Inventors: Shigeharu Taira
Original assignee: Daikin Industries, Ltd.
Priority date: 2000-06-15
Filing date: 2001-04-20
Publication date: 2001-12-20
Also published as: AU2001248806A1; TW475047B

Abstract

A communication piping unit (10), comprising a tightening joint part (12) provided at one end of a pipe (1) having a screw (11) screwed onto threads (21) formed in the outer peripheral surface of a pipe connection part (20), a nut (2) with a stepped part (2a) on the inner peripheral surface thereof, a front ferrule (3) with a front tapered surface (3a) corresponding to a divergent tapered surface (22) formed on the inner peripheral surface of the pipe connection pipe (20), and a back ferrule (4) allowed to abut on the rear surface of the front ferrule (3) and pressed against the front ferrule (3) by the stepped part (2a) of the nut (2), whereby, by tightening the nut (2), a clearance between the front ferrule (3) and the pipe (1) and a clearance between the tapered surface (22) of the pipe connection part (20) and the front tapered surface (3a) of the front ferrule (3) can be sealed.

Description

Description Piping unit and refrigeration system using it

The present invention relates to a communication pipe cut used for connecting an indoor unit such as a split type air conditioner to an outdoor unit, and a refrigeration apparatus using the same. Background art

Conventionally, there is a communication pipe unit that includes two pipes covered with a heat insulating material and connects an outdoor unit and an indoor unit of a split type air conditioner using a flare joint. In this connection piping unit, when the air conditioner is installed, both ends of the piping are flared using a special tool, and then the piping is connected to the closing valve, which is the piping connection between the indoor unit and the outdoor unit, with a flare joint. Are connected.

However, the above-mentioned connecting piping unit requires flare processing at the time of installation, so that it is troublesome, and there is a problem in that sealing performance is reduced due to adhesion of dust and processing unevenness, and refrigerant leakage occurs. Also, if a flammable refrigerant (propane, butane, ammo air, etc.) is used in the refrigerant circuit of the air conditioner, a leak may occur from the flare joint, causing a fire. In addition, the refrigerant molecular weight is small at high pressure compared to R22, and gas leaks easily.HFC refrigerants such as R4lOA, R32 or R4l0A, R whose pressure is several times higher than R32 when using 0 ₂ refrigerant, there is a problem that gas leakage occurs in the withstand voltage is low flare joint.

As described above, in the above-mentioned connecting piping unit, there is a problem that the performance and reliability of the product system are reduced and the environmental destruction (such as global warming) is caused by the refrigerant leakage. Disclosure of the invention

Therefore, an object of the present invention is to provide a communication pipe unit that can easily and reliably connect pipes and effectively prevent refrigerant leakage even when high-pressure refrigerant is used, and a cooling pipe unit using the same. It is to provide a freezing device.

In order to achieve the above object, a communication pipe unit of the present invention includes a pipe and a tightening joint provided at at least one end of the pipe, wherein the pipe is connected to a pipe connecting part by the tightening joint. A pipe cut, wherein the tightening joint has a screw that is screwed into a screw formed on an outer periphery of the pipe connection part, a nut having a step on the inner periphery, and the pipe A first ring having a front tapered surface corresponding to a divergent tapered surface formed on the inner periphery of the connecting portion; and a first ring abutting on a rear surface of the first ring and being provided by the step of the nut. And a second ring pressed toward the second ring.

According to the above configuration, the first ring, the second ring, and the nut are sequentially fitted to the outer circumference from the end side, and inserted into the inside of the pipe connection part on the connection partner side, and the nut of the nut is screwed. Is screwed into a screw formed on the outer periphery of the pipe connection part, and the nut is tightened. Then, the rear surface of the second ring is pressed toward the first ring by the step on the inner periphery of the nut, and the rear surface of the first ring is pressed against the front surface of the second ring, thereby reducing the front tapered surface of the first ring. Closely contact the tapered surface of the pipe connection. Then, the front side of the first ring is reduced inward in the radial direction by the tapered surface of the pipe connection portion, so that the inside of the first ring is tightly sealed, and the space between the first ring and the pipe is sealed, and they are fixed to each other. At the same time, the tapered surface of the pipe connection portion and the tapered surface of the front surface of the first ring are brought into close contact with each other to seal therebetween.

As described above, by sealing between the tapered surface of the above-mentioned connecting portion and the front tapered surface of the first ring, and by sealing between the first ring and the pipe, the HFC-based refrigerant is added to the refrigerant circuit. and C 0 be a natural refrigerant containing ₂ carbon oxides) in, it can be reliably prevented leakage of refrigerant, thereby improving the reliability of the air conditioner. Also, by preventing leakage of the seventh medium, environmental destruction can be prevented, and safety when using flammable refrigerants can be improved. In addition, this connecting piping unit does not require special tools for pipe connection or fire for piercing, and there is no variation due to flaring or piercing. Can connect. Also, by using a high-strength material for the first ring and the pipe connection, instead of sealing between the flared end of the pipe and the pipe connection like a flare joint, The connection and disconnection of the pipe to the pipe connection can be repeated without impairing the sealing performance.

In one embodiment, a rear tapered surface is formed on the rear inner periphery of the first ring, while the front surface of the second ring is in contact with the inside of the rear tapered surface.

According to the above configuration, when the pipe is connected to the pipe connection portion, the nut is gradually tightened, and the rear surface of the second ring is pressed toward the first ring by the step on the inner periphery of the nut. Then, the front part of the second ring presses the inside of the rear tapered surface of the first ring, and the front part of the second ring contracts radially inward by the rear tapered surface of the rear inner circumference of the first ring. However, it is possible to secure the inside between the second ring and the pipe, and fix them together. At the same time, the space between the rear tapered surface and the front part of the second ring is sealed. Therefore, refrigerant leakage can be more effectively prevented.

Two pipes each having a soil fastening joint at at least one end thereof may be bundled. In this way, two pipes used as the gas refrigerant communication pipe and the liquid refrigerant communication pipe in the refrigerant circuit of the refrigeration unit can be unitized. In the case where two pipes are bundled as described above, if the above-mentioned tightening joints respectively provided at the ends of the two pipes are arranged at predetermined intervals in the radial direction of the pipe, pipe connection is performed. The fastening joints do not interfere with each other when connected to the parts. The same effect can be obtained even when the tightening joint portions provided at the ends of the two pipes are arranged at a predetermined interval in the axial direction of the pipes.

The fastening joint may be provided at one end of the pipe, and the other end of the pipe may be brazed to the pipe connection.

In this case, the connecting pipe unit and the indoor unit can be integrated with each other by brazing the other end of the pipe to, for example, a pipe connection portion of the indoor unit. Therefore, the assembly work can be simplified by assembling in the factory and reducing the number of connecting pipes at the time of installation, and in particular, air using a slightly flammable refrigerant such as R32 and an HC-based refrigerant such as propane. In refrigeration equipment such as a harmony machine, high safety can be obtained.

Further, the refrigeration apparatus of the present invention is characterized by using a communication piping unit having any one of the above configurations.

This refrigeration apparatus uses the above-mentioned communication piping unit to provide the above-described refrigerant circuit. Even if a high-pressure refrigerant such as R410AR32 is used, refrigerant leakage can be reliably prevented, and the reliability of refrigeration systems such as air conditioners is improved. In addition, by preventing refrigerant leakage, environmental destruction can be prevented, and safety when using flammable refrigerant can be improved. Furthermore, there is no need for special tools for pipe connection or fire for brazing, and there is no variation due to flaring or brazing, and pipes can be easily and reliably connected by tightening nuts. Also, for flared joints used for flaring pipes made of copper or the like, use a high-strength material for the first ring and the pipe connection: Therefore, the pipes can be connected without impairing the sealing performance. The connection and disconnection of pipes to the connection can be repeated, which is effective for relocation. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic configuration diagram of a main part of a communication pipe unit according to a first embodiment of the present invention. FIG. 2 is a sectional view of a main part of the communication pipe unit.

FIG. 3 is a schematic configuration diagram of a main part of a communication pipe unit according to a second embodiment of the present invention. FIG. 4 is a schematic configuration diagram of a main part of a communication pipe unit according to a third embodiment of the present invention. FIG. 5 is a schematic configuration diagram of a main part of an air conditioner using a communication pipe butt according to a fourth embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a communication pipe cut and an air conditioner using the same according to the present invention will be described in detail with reference to the illustrated embodiments.

(First Embodiment)

FIG. 1 is a schematic configuration diagram of a main part of a communication pipe unit according to the first embodiment of the present invention. The communication pipe unit connects an indoor unit and an outdoor unit of a split-type air conditioner (not shown).

As shown in FIG. 1, the pipe connecting portions 20 on the indoor unit side and the outdoor unit side to which the connecting pipe unit 10 is connected are provided with a large-diameter portion 20a and a small-diameter portion on the inner periphery in order from the outside. In addition to having 2 Ob, a tapered surface 22 diverging is formed on the open end side of the large diameter portion 20a. In addition, the above-mentioned connecting pipe cut 10 is composed of pipe 1, nut 2, and An annular front ferrule 3 as a first ring and an annular pack ferrule 4 as a second ring are provided. The nut 2 has a screw 11 formed on an inner periphery thereof to be screwed with a screw 21 formed on the outer periphery of the pipe connection portion 20. The annular front ferrule 3 has a front tapered surface 3a closely contacting the tapered surface 22 of the large diameter portion 20a of the pipe connection portion 20. The annular back ferrule 4 has a flange 4a at one end on the nut 2 side. The front ferrule 3, the back ferrule 4, and the nut 2 are externally fitted in order from the end of the pipe 1. The nut 2, Freon Toferrule 3 and Bag Ferrule 4 constitute the tightening joint 12.

Although FIG. 1 shows only one end of the pipe 1 having the tightening joint 12, the same tightening joint is provided at the other end of the pipe 1 not shown. Although not shown, the communication pipe unit 10 is unitized by bundling two rooster 3 pipes 1 shown in FIG. Further, the pipe connection part 20 is a part of a closing valve.

In the connecting pipe unit 10 having the above configuration, when connecting the pipe 1 to the pipe connecting section 20, as shown in FIG. 2, the tip of the pipe 1 is connected to the large diameter section 20 a and the small diameter section 2 Ob. Insert the end of the pipe 1 into the large-diameter section 20a of the pipe connection section 20 until it abuts the step 20c between them, and then gradually tighten the nut 2. At this time, the rear surface 4 b of the back ferrule 4 is pressed toward the front ferrule 3 by the inner step 2 a of the nut 2, and the rear surface of the front ferrule 3 is pressed by the front surface of the knock ferrule 4. The front tapered surface 3 a of the front ferrule 3 is brought into close contact with the tapered surface 22 of the pipe connection portion 20. Then, the front side of the front ferrule 3 is reduced inward in the radial direction by the tapered surface 22 of the pipe connection portion 20, so that the inner pipe 1 is hardly inserted, and the space between the front ferrule 3 and the pipe 1 is sealed. At the same time, fix the front ferrule 3 to the pipe 1. At the same time, the tapered surface 22 of the pipe connection portion 20 and the front tapered surface 3a of the front ferrule 3 come into close contact with each other, and the space therebetween is sealed. Also, the rear surface 4b of the above-mentioned buffer ferrule 4 is pressed toward the front ferrule 3 by the inner step 2a of the nut 2, and the front portion of the back ferrule 4 is tapered to the rear tapered surface 3b of the front ferrule 3. Press the inside of the notch, and the front of the 3 Reduced radially inward by the rear tapered surface 3b of the inner circumference of the rear, baffled the inner piping 1, sealed between the back ferrule 4 and the piping 1, and fixed the back ferrule 4 to the piping 1. I do. At the same time, the space between the rear tapered surface 3 b of the front ferrule 3 and the front portion of the back ferrule 4 is sealed. The knock ferrule 4 prevents the front ferrule 3 from rotating when the nut 2 is tightened. In this way, a two-compression ring type joint is constituted by the pipe connection part 20, the front ferrule 3, the back ferrule 4, and the nut 2.

In this way, the space between the tapered surface 22 of the pipe connection portion 20 and the front tapered surface 3a of the front ferrule 3 is sealed, and the front ferrule 3 is cut into the pipe t, and the front ferrule 3 is cut. By sealing between Rule 3 and piping 1, even if high-pressure refrigerant such as R41OA or R32 is used in the refrigerant circuit of this split-type air conditioner, refrigerant leakage can be reliably prevented. And the reliability of the air conditioner is improved. Also, by preventing leakage of the refrigerant, it is possible to improve the recovery rate of the refrigerant, prevent global warming due to the effect of suppressing the discharge of refrigerant, protect the ozone layer, and provide safety when using flammable refrigerants. Performance can be improved.

In addition, since the connecting piping unit 10 does not require flaring or brazing of piping, there is no need to use special tools for connection or fire for brazing, and variations due to flaring or brazing are not required. The nut 2 can be easily and securely connected by tightening the nut 2 to the pipe connection part 20, and the connection and disconnection of the pipe 1 to and from the pipe connection part 20 can be performed without deteriorating the sealing performance. Can be repeated.

In addition, by using the communication pipe unit 10 connected to the pipe connection with a 2-compression ring type joint capable of coping with the above high pressure for a refrigerator such as an air conditioner, R 410 as an alternative refrigerant to the HCFC refrigerant is used. production of products corresponding using natural refrigerants containing a and R 3 2, etc. HFC refrigerant and C 0 ₂ (carbon dioxide) can be early.

In addition, a rear tapered surface 3b diverging around the rear inner periphery of the front ferrule 3 is formed, while the front portion of the pack ferrule 4 contacts the inside of the rear tapered surface 3b, so that the back ferrule is formed. 4 and the pipe 1, and they can be fixed to each other.The front tapered surface 3a of the front ferrule 3 and the back A seal can be formed between the front part of the ferrule 4 and refrigerant leakage can be more effectively prevented.

In addition, the pipe connection part 20, the front ferrule 3, the back ferrule 4, and the nut 2 are made of stainless steel (SUS material) or brass, and the cost is preferably reduced by using a low-cost material such as brass. Can be reduced.

(Second embodiment)

FIG. 3 is a schematic view of the communication pipe cut of the second embodiment of the present invention. The connection pipe cut of the first embodiment except for the position of the fastening joint is shown in FIG. It has the same configuration as the connecting pipe shown in Fig. 1.

As shown in FIG. 3, the communication pipe cut includes two pipes 31A and 31B, and tightening joints 32A and 32B provided at one end of the pipes 31A and 31B, respectively. The joints 32A and 32B are arranged at a predetermined interval L1 in the radial direction of the pipes 31A and 31B. Further, although not shown, the other end of the communication pipe has the same configuration. The fastening joints 32A and 32B are composed of a nut 2, a front ferrule 3 and a back ferrule 4 shown in FIG.

As described above, since the above-described tightening joints 32A and 32B are separated by the distance L1 in the radial direction of the pipes 31A and 3IB, the tightening joints 3.2A and 32B may interfere with each other when connected to the pipe connection. Absent.

(Third embodiment)

FIG. 4 is a schematic diagram of a communication pipe unit according to a third embodiment of the present invention. This communication pipe cut is shown in FIG. 1 of the first embodiment except for the position of a fastening joint. It has the same configuration as the communication pipe.

As shown in FIG. 4, the communication pipe cut includes two pipes 41A and 41B, and tightening joints 42A and 42B provided at one ends of the pipes 41A and 41B, respectively. The joints 42A and 42B are arranged at a predetermined interval L2 in the axial direction of the pipes 41A and 41B. Although not shown, the other end of the contact rooster control unit has the same configuration. The fastening joints 32A and 32B are composed of a nut 2, a front ferrule 3 and a back ferrule 4 shown in FIG.

In this way, the tightening joints 42A, 42B are axially interposed between the pipes 41A, 41B. Since they are separated by the distance L2, the tightening joints 42A and 42B do not interfere with each other when connected to the pipe connection.

(Fourth embodiment)

FIG. 5 is a schematic diagram of an air conditioner using a connecting pipe unit according to a fourth embodiment of the present invention. This connecting pipe cut is different from that of the first embodiment except that a fastening joint is used only at one end of the pipe. Therefore, it has the same configuration as that of the communication pipe cut shown in FIG. 3 of the second embodiment.

As shown in FIG. 5, the communication piping unit includes two pipes 51A and 51B, and tightening joints 52A and 52B at one end of the pipes 51A and 51B, and connects the tightening joints 52A and 52B to each other. The pipes 51A and 51B are separated along the radial direction. The other ends of the pipes 51A and 51B are connected to pipe connection portions 54A and 54B of the indoor unit 55 by brazing, respectively. Then, the portions excluding both ends of the pipes 51A and 51B are covered with a heat insulating material 53 and bundled. Note that the piping connection portions 54A and 54B of the indoor unit 55 are closing valves.

In this way, the other ends of the pipes 51A and 51B are connected in advance at the time of assembling at the factory, and the communication pipe unit and the indoor unit 55 are integrated, so that the connection pipe at the time of installation is integrated. By reducing the number of connection points, installation work can be simplified, and high safety can be obtained especially for air conditioners using slightly flammable refrigerants such as R32.

In the above-described first to third embodiments, the fastening joints are provided at both ends of the pipes 1, 31A, 31B, 41A, 41B. However, as in the fourth embodiment, the fastening joints are provided only at one end of the pipe. Alternatively, the other end of the pipe may be connected to the pipe connection part by brazing. In this case, the other end of the pipe may be connected by brazing at the time of installation, or the other end of the pipe may be connected to the pipe connection part in advance at a factory.

In the first to fourth embodiments, the communication pipe unit for connecting the indoor unit and the outdoor unit of the split type air conditioner has been described. However, the present invention is applied to a communication pipe unit used for another refrigeration device. May be.

Claims

The scope of the claims

1. Piping (1, 31 A, 31 B, 41 A, 41 B, 51 A, 5 IB) and tightening joints (12, 32 A, 32 B, 42 A, 42 B) provided at least at one end of the Rooster S pipe , 52A, 52B), and the communication pipe unit (10) in which the pipe is connected to the pipe connection section (20, 54A, 54B) by the tightening joint.

The tightening joints (12, 32A, 32B, 42A, 42B, 52A, 52B)

A nut (2) having a screw (11) screwed into a screw (21) formed on the outer periphery of the pipe connection portion (20), and having a step (2a) on the inner periphery;

A first ring (3) having a front tapered surface (3a) 'corresponding to a flared tapered surface 22) formed on the inner periphery of the pipe connection portion (20);

A second ring (4) that comes into contact with the rear surface of the first ring (3) and is pressed toward the first ring (3) by the step (2a) of the nut (2). A communication pipe cut characterized by this.

2. In the communication pipe unit according to claim 1,

A rear tapered surface (3b) diverging around the rear inner periphery of the first ring (3), while the front portion of the second ring (4) is in contact with the inside of the rear tapered surface (3b). A communication piping unit characterized by the following.

3. In the communication pipe cut according to claim 1,

At least one end of the tightening joint (12, 32 A, 32B, 42A,

A connecting pipe unit characterized in that two pipes (1, 31A, 31B, 41A, 41B, 51A, 51B) provided with 42B, 52A, 52B) are bundled. Cut.

4. In the communication pipe unit according to claim 3,

The fastening joints (32A, 32B, 52A, 52B) provided at the ends of the two pipes (31A, 31B, 51A, 51B) are connected to the pipes (31A, 31B, 51 A, 51 B) are arranged at a predetermined interval (L 1) in the radial direction. A communication pipe unit characterized by the fact that:

5. In the communication piping unit according to claim 3,

The fastening joints (42A, 42B) provided at the ends of the two pipes (41A, 41B) are spaced from each other at a predetermined distance (L2) in the axial direction of the pipes (41A, 41B). The connecting piping unit is specially arranged.

6 .. In the communication pipe unit according to claim 1,

One end of the pipe (51A, 51B) is provided with the fastening joint (52A, 52B), and the other end of the pipe (51A, 51B) is brazed to the pipe connection (54A, 54B). Characteristic connecting piping unit.

7. A refrigeration apparatus using the communication pipe unit according to claim 1.