JPH0328278Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a joint fitting that facilitates assembly work in air conditioners such as separate room air conditioners.

(Prior art) In an air conditioner such as a separate room air conditioner, outdoor unit A (compressor a,
Attach the fitting c to the low pressure side (suction side) pipe and high pressure side (discharge side) pipe of the condenser b, etc.), and connect the low pressure side piping p ₁ and the high pressure side piping p ₂ to this. It is connected to indoor unit B (including evaporator f, blower, etc.), and when the conditioner is shipped from the factory or relocated to another location, it is connected to indoor unit B and piping. Collect the refrigerant contained in p ₁ and p ₂ to the outdoor unit A side, separate the inner and outer units, connect the piping again as shown in the figure at the new installation location, and connect the outdoor unit A to the outdoor unit A.
The refrigerant collected on the side is returned to the indoor unit B side.

For this reason, a refrigerant charge valve is generally provided on the low-pressure side joint c (in some cases, it may also be provided on the high-pressure side) to drain air that has entered the piping or indoor unit B during installation into the outdoor unit. The refrigerant sealed in A is used to expel the air and replace the air mixed in with the refrigerant.
As one of such joint fittings, a joint using a spindle valve as shown in FIG. 6 has been used so far.

That is, the joint body 1 has upper and lower vertical port parts 1.
a, 1c and the left and right horizontal port parts 1d, 1b form a cross shape, and the upper vertical port part 1a has a conical surface with a concave shape at the lower end to communicate and block vertical and horizontal fluid passages. A spindle valve 2 with a male thread is screwed in, a cap 4 is provided at the upper end to prevent refrigerant from flowing out, and a copper pipe 3 connected to the low pressure side pipe or high pressure side pipe of the outdoor unit A is attached to the lower vertical port portion 1c. The left side port portion 1b has a male thread on its circumferential surface, and is connected to the low-pressure side pipe _p1 or the high-pressure side pipe _p2 connected to the indoor unit B by means of a flare nut 5. A valve core 6 for refrigerant charging is screwed into the left side port portion 1d, and a cap 7 is provided at the outer end. When installing the air conditioner, the pipes p ₁ and p ₂ are connected to the right side port 1b of each joint c by flare nuts 5. After that, the upper vertical port part 1 of the joint fitting c connected to the high pressure side piping p ₂
Remove the cap 4 from a, raise the spindle valve 2 with a tool, connect the right side port part 1b and the lower vertical port part 1c, and remove the cap of the left side port part _1d of the fitting c connected to the low pressure side pipe p1. Remove 7,
The head of the valve core 6 is pressed to purge the air contained in the pipes p ₁ and p ₂ and the indoor unit B, and to replace the refrigerant therewith. Thereafter, the spindle valve 2 of the fitting c connected to the low-pressure side pipe _p1 is raised to connect the refrigerant circuit.

At the time of separation, the cap 4 of the upper vertical port part 1a of the high pressure side joint c is removed, the spindle valve 2 is lowered to block the fluid passage, the compressor a of the outdoor unit A is started, and the pipes p ₁ and p ₂ and indoor unit B
The cap 4 of the left side port section 1d of the low pressure side joint fitting is removed, the spindle valve 2 is lowered, the fluid passage is cut off, and then the piping p ₁ , is removed from each side port section 1b. Remove p ₂ and separate outdoor and indoor units A and B. Reassembly is performed in the same manner as installation.

(Problem that the invention aims to solve) At this point, with the conventional fittings mentioned above, the cap on the vertical port section is removed and re-applied to a certain degree of force every time the conditioner is operated, separated, reassembled, refrigerant replaced, etc. In addition, the spindle valve must be raised and lowered each time to open and close the fluid passage, which makes the work time-consuming.

Therefore, this invention provides a joint fitting that does not require the need for each time the cap is attached and detached or the valve body is touched from the outside when installing and separating the harmonizer and replacing the refrigerant.

(Means for solving the problem) Based on the above purpose, this invention seals and fixes the copper pipe to which the pipe on the outdoor unit side is to be connected to the open end.
The inner surface of the base has an outward-expanding slope, a large diameter part that accommodates the head of the tube valve, an elastic O-ring embedded inside, and a male thread on the outer periphery to connect indoor piping via a flare nut. Inside the joint body, which consists of a small diameter part that is to be connected, there is a head on the large diameter side with an outer diameter slightly larger than the inner diameter of the small diameter part and an elastic sealing material attached to the circumferential surface, and the head is adjacent to this head. A tube valve with multiple through holes in the wall and an elastic ring attached to the tip is inserted, and the tube valve is biased toward the small diameter portion by a coil spring installed in the copper tube, and the head is closed when not in operation. The tube valve is characterized in that the elastic sealing material on the circumferential surface of the tube is pressed against the slope inside the large diameter portion to block the fluid passage, and the tube valve is made to protrude from the small diameter portion.

(Function) When the air conditioner is operating, each flare nut that connects the high-pressure and low-pressure side piping is screwed deeply into the small diameter part and the tube valve is pushed to open the fluid passage, and when the conditioner is separated, the low-pressure side tube valve is opened. Leave the tube valve of the high pressure side joint closed,
Start the compressor to recover the refrigerant in the indoor unit and piping to the outdoor unit, close the low-pressure side valve to separate the equipment, and when reinstalling, set the low-pressure side flare nut to a semi-threaded state and close the high-pressure side valve. Open the tube valve by screwing the flare nut deeply into the tube valve, and in this state, press the valve core on the low pressure side to purge the air in the indoor unit and piping with the refrigerant sealed in the indoor unit A, and replace the refrigerant therewith. Next, open the tube valve on the low pressure side.

(Example) Figures 1 to 3 show a joint c of this invention, and 11 is a stepped part with a large diameter part 11a (in the illustrated example, it has a hexagonal outer shape) and a small diameter part 11b. The joint body has a cylindrical shape, and a male thread 11e is provided on the circumference of the small diameter portion 11b, and there is a low pressure side piping _p1 (or a high pressure side piping p2) connected to the indoor unit via a flare nut _20. ), and one open end of the large diameter section 11a has a conically narrowed copper pipe to which the low pressure side pipe (or high pressure side pipe) of the outdoor unit is to be connected. 12 are sealed together by brazing.

The base of the large-diameter portion 11a, which is located at the center of the joint body 11, is formed thickly, and is provided with a vertical hole 11c orthogonal to the internal fluid passage. Spreading slope 1
1d is formed, and an elastic O-ring 17 is embedded in the small diameter portion 11b side, and the tube valve 1 described below is
3 to prevent refrigerant from leaking when the flare nut 20 is connected.

The joint body 11 is provided with a head 13a on the large diameter portion 11a side, the length of which is approximately equal to that of the joint body, and a plurality of through holes 13b are provided in the wall adjacent to the head 13a.
A tube valve 13 with the small diameter portion 11b side open is fitted into the head 13a, and the circumferential surface of the head 13a has an outer diameter slightly larger than the inner diameter of the small diameter portion 11b and is uneven. Material 14a
is attached, and an elastic ring 14b having a triangular cross section is also attached to the tip of the cylindrical portion, and
A retainer 15 is arranged in a tripod shape inside the copper tube 12 fixed to the open end of the main body 11, and is fixed in a fixed position by an annular groove 12a formed in a part of the copper tube 12. A coil spring 16 having a required strength is disposed between the retainer 15 and the head 13a of the tube valve, and the spring force of the coil spring 16 causes the tube valve 13 to move toward the small diameter portion 11b, that is, toward the indoor unit. energized, the head 13a
The elastic sealing material 14a is pressed against the slope 11d inside the large diameter portion 11a to block the fluid passage in the joint body 11, and the tip of the cylindrical portion protrudes toward the indoor unit from the open end of the small diameter portion 11b. A charge boat section 18 is brazed and erected on the vertical hole 11c provided at the base of the large diameter section 11a of the main body, and a valve rod 19a is provided at the center of the charge boat section 18 as shown in FIG. is inserted with a spring bias, and by pushing this valve stem 19a, the lower end valve 1 is inserted.
A port cap 21 is screwed in and houses a valve core 19 whose opening 9b is opened, and an internal protrusion 21a at the upper end presses against the end surface of the port portion to prevent refrigerant from leaking from the port portion 18.
is applied.

When using it under the above structure, the fifth
As shown in the figure, the copper pipe 12 of the fitting c above is connected to the pipe on the suction side (low pressure side) of the compressor a of the indoor unit A.
The pipes on the discharge side (high pressure side) may be of the same type as the above-mentioned fittings, but usually a fitting c without the charge boat part 18 provided on the large diameter part 11a is connected and fixed. Connect the pipe p ₁ or
When p ₂ is screwed in deeply with the flare nut 20 as shown in Fig. 2, the tube valve 13 in the joint body 11 is pushed by the flared portions of the pipes p ₁ and p ₂ .
While compressing the coil spring 16, it moves toward the outdoor unit A, and the elastic sealing material 14a on the head 13a separates from the slope 11d in the large diameter portion 11a, opening a fluid passage through the plurality of through holes 13b. Refrigerant circulates through the piping.

When separating the inner and outer units for shipment or relocation of the conditioner, leave the tube valve 13 on the low pressure side open, loosen the flare nut 20 on the high pressure side to a half-threaded state (Fig. 3), and tighten the compressor. The refrigerant in the indoor unit B and the piping is recovered to the outdoor unit A side by the operation of the machine a, and then the refrigerant is transferred from the fitting c on the high pressure and low pressure sides to the piping _p1 , together with the flare nut 20.
Remove p ₂ and separate the inner and outer units.

When reinstalling at a new location, _first attach the flare nuts 20 to the small diameter portions 11b of the high-pressure and low-pressure joint fittings as shown in _FIG . The port cap 21 is screwed into contact with the elastic ring 14b, and then the port cap 21 is removed from the charge port portion 18 of the joint body 11 on the low pressure side, and the flare nut 2 on the high pressure side is removed.
0 deeply screwed together, open the tube valve 13,
By pushing the head 19a of the port cap 21, the refrigerant filled in the outdoor unit A pushes out the air that has entered the indoor unit B and the pipes _p1 and _p2 , and replaces the air with the refrigerant. Thereafter, the flare nut 20 on the low pressure side is screwed in deeply and the tube valve 13 is opened as shown in FIG. 2 to form a refrigerant circuit.

(Effects of the invention) As described above, according to this invention, when operating, disassembling, and reassembling an air conditioner, the caps of the vertical ports are removed one by one, and the spindle valves are operated up and down, just like in conventional fittings. However, there is no need to retighten the cap to a certain strength, and it can be easily done by simply screwing in the flare nut that attaches the piping on the indoor unit side.
It is time-consuming and efficient.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional side view of this invention in the valve closed state.
Fig. 2 is a half-sectional side view of the valve in the open state, Fig. 3 is a half-sectional side view of the valve during air venting and refrigerant replacement, Fig. 4 is a half-sectional elevational view of the valve core, and Fig. 5 shows the joint fitting of the present invention. System diagram of the harmonizer used. FIG. 6 is a sectional view of a conventional joint fitting. Figure 7 is a system diagram of a harmonizing machine using conventional fittings. In the figure, 11...joint body, 11a...large diameter part,
11b...small diameter part, 11d...slope, 12...copper tube, 13 tube valve, 13a...head, 13
b...Through hole, 14a...Elastic sealing material, 14b...
...Elastic ring, 15...Retainer, 16...Coil spring, 18...Charge port section, 19...Valve core.

Claims (1)

[Scope of utility model registration request] A copper pipe 12 to which a pipe on the outdoor unit side is to be connected is hermetically fixed at the open end, a slope 11d expanding outward is provided on the inner surface of the base, and the head 1 of the tube valve 13 is
3a, an elastic O-ring 17 is buried inside, and a male thread 11 is installed on the outer periphery.
A small diameter part 11 is provided on the large diameter part 11a side inside the joint body 11, which is made up of a small diameter part 11b which is equipped with a flare nut 20 and is connected to indoor piping via a flare nut 20.
This head 1 has a head 13a with an outer diameter slightly larger than the inner diameter of b and an elastic sealing material 14a attached to the circumferential surface.
A plurality of through holes 13b are provided in the wall adjacent to the copper tube 3a, and a tube valve 13 with an elastic ring 14b attached to the tip thereof is inserted, and the tube valve 13 is connected to the small diameter portion by a coil spring 16 disposed in the copper tube 12. 11b side, and when not in operation, the elastic sealing material 14a on the circumferential surface of the head is pressed against the slope 11d within the large diameter portion 11a.
A joint fitting for an air conditioner, characterized in that the tube valve 13 is brought into pressure contact with the small diameter portion 13b to block a fluid passage, and the tube valve 13 protrudes from the small diameter portion 13b.