JP2556223Y2 - Fittings for air conditioners - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fitting for easily and reliably recovering a refrigerant and separating an inner and outer unit when a separate type air conditioner is relocated.

[0002]

2. Description of the Related Art In a separate type air conditioner, when the conditioner is relocated to another place, the refrigerant contained in the indoor unit or the piping is recovered to the outdoor unit (so-called pump-down). In general, indoor and outdoor units are separated and transferred. In this case, the refrigerant can be recovered simply by screwing in the flare nut appropriately without attaching and detaching the cap and operating the valve many times. A fitting fitting capable of separating the unit from the unit is proposed in Japanese Utility Model Laid-Open No. 61-185966.

FIG. 4 to FIG. 7 schematically show a joint main body 1 having a large diameter portion 1a and a small diameter portion 1b, and a pipe conically narrowed at an open end of the large diameter portion 1a. The body 2 is hermetically fixed, and the inside of the large-diameter portion 1a has an outwardly extending slope 1d.
On the other hand, the head 3a of the tube valve 3 is accommodated, the external thread 5 is provided on the outer surface of the small diameter portion 1b, the elastic ring 4c is embedded on the inner surface, and the large diameter portion 1a has Head 3 having elastic sealing material 4a attached to the peripheral surface
a tube valve 3 provided with a through-hole 3b in a cylindrical portion near the head thereof and having an elastic ring 4b for sealing with a conduit at the rear end. 2 is biased toward the small-diameter portion 1b by the coil spring 6 disposed therein, and the small-diameter portion 1b is provided with a tapered surface 8a therein and a conduit P connected to the indoor unit is inserted into the small-diameter portion 1b so that the flared end thereof is brought into contact. The coupling fitting D is connected to the high pressure side pipe of the outdoor unit A by the pipe 2 as shown in FIG. 7, while the low pressure side pipe is connected to the large pressure pipe as shown in FIG. A vertical port 1c is provided in the diameter portion 1a, and a charge port portion 9 in which a valve core 9a is provided thereon is provided thereon.
Is connected to the fitting D '.

[0004] When the harmony machine is in operation, as shown in FIGS.
Are opened together, the compressor C is operated to circulate the refrigerant in the circuit, and when the air conditioner is relocated, the tube valve 3 on the low pressure side is kept open and the flare nut 8 of the fitting metal fitting on the high pressure side is opened. Into a half screwed state as shown in FIG.
The head 3a of the tube valve 3 is brought into contact with the tapered surface 1d, and the compressor C is operated in that state, so that the indoor unit B
And the refrigerant contained in the conduit P is recovered to the outdoor unit A side. Thereafter, the conduit P is removed together with the flare nut 8 from the high-pressure and low-pressure side joint body 1 and the inner and outer units A and B are removed.
I try to separate. Reassembly at a new location is performed according to the procedure, but the description is omitted.

[0005]

When the refrigerant contained in the indoor unit B and the conduit P is recovered to the outdoor unit A in separating the indoor and outdoor units, a pipe on the high pressure side of the outdoor unit A is used. In the joint fitting connected to the compressor, it is necessary to shut off the internal passage leading to the compressor and at the same time to shut off the intrusion of the atmosphere from the joint of the flare nut 8, but in the above-mentioned conventional fitting, the loosening operation of the flare nut 8 is required. The head 3a of the tube valve 3
The upper elastic sealing material 4a is brought into contact with the tapered surface 1d in the large diameter portion 1a, while the elastic ring 4b at the rear end of the valve is connected to the conduit P.
A structure in which the two ends of the tube valve 3 are simultaneously abutted in the axial direction.
If the flare nut 8 is not loosened even a little, the elastic sealing material 4a at the valve head will not contact the tapered surface 1d.
If the internal shut-off is incomplete or too loose, the flared end of the conduit P will be separated from the elastic ring 4b at the rear end of the valve, making it impossible to shut off the outside. The delicate operation of the flare nut 8 and considerable attention However, it is troublesome, and there is a problem that air is easily sucked and refrigerant leaks easily.

Therefore, the present invention provides a joint fitting which can be easily and reliably operated without recovering the refrigerant from the indoor unit to the outdoor unit without requiring delicate operation of the flare nut or excessive attention. Aim.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a large-diameter pipe fitting for an air conditioner in which a pipe connected to a high pressure side pipe of an outdoor unit is hermetically sealed at an open end. Part, a medium diameter part, and a small diameter part having a thread on the outer surface, forming a tapered surface that spreads outward at the inner boundary between the large diameter part and the medium diameter part, and an elastic seal inside the large diameter part. A tube valve having a head with a material attached to the peripheral surface, a through-hole provided in a cylindrical portion adjacent to the head is spring-biased and inserted into the small-diameter portion, and the elastic sealing material is used when not operated. The rear end of the valve is made to protrude from the small-diameter portion while being pressed against the tapered surface. An elastic O-ring is buried in the outer surface of the middle-diameter portion near the small-diameter portion and at a fixed position on the large-diameter portion side. A joint body provided with a display section, and a pipe having a thread and a tapered surface inside the conduit insertion section. And a flare nut which is formed of a front tube portion to be inserted into the middle diameter portion, and an elastic O-ring is embedded in the inner surface of the conduit insertion portion so as to be in close contact with the peripheral surface of the conduit. And

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a joint fitting according to the present invention; FIG. Reference numeral 11 denotes a cylindrical joint body, a large-diameter portion 11 having an open end and a polygonal outer surface.
a, a medium diameter portion 11b as described later, and a small diameter portion 11c having a conical surface having an external thread 11e to which a flare nut is screwed on the outer surface and having an end surface substantially coinciding with a tapered surface in the flare nut. A conical narrowed tube 12 to be connected to the outdoor unit of the air conditioner is hermetically connected to the open end of the large diameter portion 11a by brazing.

Inside the joint body 11, a tapered surface 11d extending outward is formed at the boundary between the large diameter portion 11a and the middle diameter portion 11b, and the length of the joint body 11 is substantially the same as that of the joint body. Equally provided with a head 13a on the large diameter portion 11a side,
A plurality of through holes 13b are provided in the cylindrical portion adjacent to the head portion 13a, and the tube valve 13 whose small diameter portion 11c is open and whose end surface forms a conical surface is fitted therein.

The outer surface of the head portion 13a of the tube valve 13 is slightly larger in outer diameter than the inner diameter of the medium diameter portion 11b and provided with irregularities, on which an elastic sealing material 14 such as rubber is attached. A tripod-shaped retainer 15 is fixed through a restriction groove inside the restriction pipe body 12 brazed to the open end of the opening 11a, and a coil spring is provided between the retainer 15 and the head 13a of the tube valve. 16 are arranged,
The spring force of the coil spring 16 causes the tube valve 1
Numeral 3 is urged toward the small-diameter portion 11c, that is, toward the indoor unit, and the elastic sealing material 14 of the head portion 13a presses against the tapered surface 11d in the large-diameter portion 11a to block the fluid passage in the joint main body 11 and to reduce The rear end protrudes from the opening end of the small diameter portion 11c toward the indoor unit.

Reference numeral 18 denotes a flare nut, which is a conduit insertion portion 18a.
And a nut portion 18b having an outer surface formed in a polygonal shape and having an internal thread 18e on the inside, and extending from the nut portion 18b to the coupling side by a certain length,
An inner diameter is formed by a front cylindrical portion 18c having an inner diameter substantially equal to an outer diameter of a middle diameter portion 11b of the joint body 11, and a nut portion 1 is formed.
8b, a tapered surface 18d extending toward the nut portion is formed at the boundary between the conduit insertion portion 18a and the conduit insertion portion 18a.
An elastic O-ring 19b is embedded on the inner surface near the open end of
A conduit P through which high-pressure condensed refrigerant flows toward the indoor unit is inserted into the conduit insertion portion 18a, and its flared end abuts against the tapered surface 18d in the nut portion, while the outer peripheral surface has elasticity O.
It is designed to be in close contact with the ring 19b.

An elastic O-ring 19a is buried in the outer peripheral surface of the middle diameter portion 11b of the joint body 11 at a position close to the boundary with the small diameter portion 11c, and the inner surface of the front cylindrical portion 18c of the flare nut 18 is provided. And a fixed position on the larger diameter portion 11a side, that is, a position where the elastic sealing material 14 on the head 13a of the tube valve comes into close contact with the tapered surface 11d when the flare nut 18 is loosened. Is provided with a display unit 17 (illustrated as a groove in the figure, but this may be another appropriate sign).

In use, the joint body 11
Is connected to the pipe on the high pressure side of the outdoor unit via the pipe 12, and the flare nut 18 is attached to the middle diameter portion 11 b of the joint body 11.
The nut portion 18b is connected to the small-diameter portion 1 while the front cylindrical portion 18c is fitted.
1c, and if it is screwed deeply, the rear end of the tube valve 13 in the joint main body 11 is pushed by the flared end of the conduit P as shown in FIG. , The elastic sealing material 14 on the head 13a is separated from the tapered surface 11d, and the fluid passage is opened via the through hole 13b.

A conventional joint fitting having a charge port portion as shown in FIG. 6 or a joint fitting having a charge port portion provided on the joint body is connected to the low pressure side pipe of the outdoor unit. The connection of the flare nut also opens the fluid passage. When the compressor is operated in this state, the refrigerant circulates through the circuit. At this time, the inner surface of the front cylindrical portion 18c of the flare nut 18 and the conduit P
Is an elastic O-ring 19 on the middle diameter portion 11b of the joint body.
a and the flare nut are sealed by an elastic O-ring 19b of the conduit insertion portion 18a.

When the inner and outer units are separated for the transfer of the air conditioner, the tube valve on the low pressure side is kept open and the flarenut 18 of the fitting on the high pressure side is loosened as shown in FIG. If the distal end of the cylindrical portion 18c is retracted to a position corresponding to the display portion 17 on the middle diameter portion 11b of the joint body, the tube valve 13 is moved by the spring force of the coil spring 16.
When the compressor is operated in this state, the refrigerant in the indoor unit and the refrigerant contained in the conduit will be closed. Is collected on the outdoor unit side.

At this time, even if the rear end of the tube valve 13 and the flared end of the conduit P are separated as shown in the figure, the inner surface of the front cylindrical portion 18c of the flared nut has the elastic O.
The conduit P is sealed by a ring 19a and the outer surface of the conduit P is sealed by an elastic O-ring 19b in the insertion portion 18a, thereby preventing the outside air from being sucked from the joint portion between the joint body 11 and the flare nut 18 and leakage of the refrigerant. You. Thereafter, the conduit together with the flare nut is removed from the high-pressure and low-pressure side joint bodies, and the inner and outer units are separated.

[0017]

As described above, according to the present invention, a joint body having a tube valve inside is connected with a flare nut to connect indoor and outdoor units. The large-diameter part connected to the high-pressure side pipe of the outdoor unit, the medium-diameter part, and the small-diameter part screwed with the flare nut are formed, while the flare nut is fitted to the conduit insertion part, the nut part, and the medium-diameter part of the joint body. An elastic O-ring is provided at a position near the small diameter portion on the outer surface of the middle diameter portion of the joint body to seal the inner surface of the flare nut. An elastic O-ring is also provided on the inner surface of the conduit insertion portion to seal the peripheral surface of the conduit from the radial direction. Therefore, when the refrigerant is recovered to the outdoor unit when the inner and outer units are separated, the joint between the joint body and the flare nut is connected. To Compared to previous sealing axially rear end of the lube, without requiring excessive attention and delicate holding back the operation of the flare nut improves the sealing of the coupling portion,
Inhalation of outside air and leakage of refrigerant can be reliably prevented.In addition, a display is provided on the outer surface of the middle diameter part of the joint body at a fixed position on the large diameter side from the sealing ring, so the flare nut at the time of refrigerant recovery Can be easily and quickly performed.

[Brief description of the drawings]

FIG. 1 is a side view of a judgment surface in a state where a joint main body and a flare nut of a joint fitting according to the present invention are separated.

FIG. 2 is a side view of a judgment surface in a state where both are combined.

FIG. 3 is a side view of a judgment surface in a state where a flare nut is loosened at a predetermined position.

FIG. 4 is a side view of a judgment surface of a connection state of a conventional joint fitting connected to a high pressure side.

FIG. 5 is a judgment view when a flare nut of a conventional high-pressure side fitting is loosened.

FIG. 6 is a view showing a determination of a connection state of a joint fitting connected to a low-pressure side.

FIG. 7 is a system diagram in which units inside and outside the air conditioner are connected.

[Explanation of symbols]

11 Joint body 11a Large diameter part 11
b Medium diameter part 11c Small diameter part 11d Tapered surface 12
Tube 13 Tube valve 13a Head 13
b Through hole 14 Elastic sealing material 15 Retainer 16
Coil spring 17 Display 18 Flare nut 18
a Conduit insertion part 18b Nut part 18c Tip tube part 19
a Elastic O-ring 19b Elastic O-ring

Claims (1)

(57) [Scope of request for utility model registration] 1. A large-diameter portion 11a in which a pipe body 12 connected to a pipe on the high-pressure side of an outdoor unit is hermetically fixed at an open end, a middle-diameter portion 11b, and a small-diameter portion 11c having a screw on an outer surface. An outwardly expanding tapered surface 11d is formed at an inner boundary between the portion 11a and the middle diameter portion 11b, and a large diameter portion 11a is formed inside.
A tube valve 13 having a head 13a having an elastic sealing material 14 attached to the peripheral surface on its side and having a through-hole 13b in a cylindrical portion adjacent to the head 13a is spring-biased toward the small-diameter portion 11c and fitted. At the time of non-operation, the elastic sealing member 14 is pressed against the tapered surface 11d and the rear end of the valve is projected from the small diameter portion 11c. On the outer surface of the middle diameter portion 11b, an elastic O is located at a position close to the small diameter portion 11c. The display unit 17 is buried with the ring 19a and fixed at a certain position on the side of the large-diameter portion 11a.
The joint body 11 is provided with: a conduit insertion portion 18a; a nut portion 18b having a thread and a tapered surface 18d inside; and a front tube portion 18c to be inserted into the middle diameter portion 11b. A fitting for an air conditioner, comprising a flare nut 18 having an elastic O-ring 19b embedded therein so as to be in close contact with the peripheral surface of the conduit.