JPH0530687U - Pipe fittings for air conditioners - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to reliably and simultaneously connect and disconnect the high-pressure side and low-pressure side conduits connecting the indoor and outdoor units of the air conditioner with only one set of pipe joints. [Structure] A cylindrical valve body 4 is arranged at the center of the inside of the female body 1 to which the union nut 2 and the tube body 3 are attached, and a sleeve valve body 6 having a sealing material at the front end and the peripheral surface is provided inside the female body 1. Is fitted to the male side by spring biasing, the valve core 10 is attached to the male side end of the tubular valve body 4, and the conduit P ₁ connected to the high pressure side of the equipment is joined to the non-male side end of the tubular body. The cap body 8 for closing 3 is provided with a female joint F to which a conduit P ₂ connected to the low pressure side is joined, an annular projection 11b is provided in the female end of the male body 11, and the tube body 3 is joined to the opposite end. A cylindrical valve body is arranged at the center of the inner side of the male body 11, and a sleeve valve body 16 having a sealing material at the front end edge is fitted on the female side end by spring biasing to the female side. The valve core 10 is installed in the female end of the body 14, and the conduit P ₁ connected to the high pressure side of the equipment is joined to the non-female end. The cap body 18 for closing the tube body 13 is composed of a male joint M to which a conduit P ₂ connected to the low pressure side is joined.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to improvement of a pipe joint for a separate type air conditioner having a self-sealing valve body inside.

[0002]

[Prior Art]

 This type of conventional pipe joint is shown in FIG. 7, and a female joint F'is a long fixed valve body 4'having a rear end fixed to a retainer 5'having a tripod inside a female body 1 '. A sleeve 6'having seal members 6a 'and 6b' attached to the front end surface and a part of the peripheral surface is housed, and the sleeve 6'is provided with a coil spring 7 disposed between the rear end and the retainer 5 '. When the joint is separated, the lower half of the sealing material 6a 'on the front end face is pressed against the peripheral portion of the head portion of the fixed valve body 4'to close the internal passage.

On the other hand, in the male joint M ′, a short movable valve body 14 ′ having a front end face covered with a sealing material 14 a ′ is housed inside a male body 11 ′, and its shaft portion is a tripod-shaped retainer 15. ′ Is slidably supported by the ′ ′ and is urged toward the female side by a coil spring 17 ′ disposed between the head peripheral edge and the retainer 15 ′, and when the joint is separated, the sealing material for the movable valve body 14 ′. The peripheral portion of 4a 'is pressed against the taper surface 11a' in the female end of the male body 11 'to close the internal flow passage, and the male body 11' is provided with an annular recess 11b 'on the female end surface. In the annular recess 11b ', a seal ring 18' made of hard metal and having a triangular cross section is embedded.

Then, as shown in FIG. 8, when a union nut 2'rotatably mounted on the female body 1'is screwed into the male body 11 ', the female fixed valve body 4'is moved to the male movable valve. While hitting the body 14 'and retracting it, the inner protrusion of the annular recess 11b' of the male body 11 'presses against the upper half of the sealing member 6a' of the female sleeve 6'and retracts it. Then, the flow path in the joint is opened, and at the same time, the sharp edge of the seal ring 18 'on the male side is pushed into the front end surface of the female body 1', and the female and male joints F ', M'are hermetically coupled. Be done.

[0005]

[Problems to be solved by the device]

By the way, when attaching the above-mentioned pipe joint to a pipe circuit of an air conditioner, in order not to mistake the high-pressure side pipe and the low-pressure side pipe, normally, as shown in FIG. 9, the high-pressure side pipe P ₁ , The male joint M'is connected to the outdoor unit A side, while the female joint F'is connected to the indoor unit B side, and in the low pressure side pipe P ₂ , the male and female joints M'and F'are connected in reverse. However, in this way, in the conventional system, one pair of female and one male pipe joints were required for the high-pressure side and low-pressure side, respectively, and the number of parts was increased, so separate connection and separation work must be performed. In addition, in the actual installation work of the equipment, it is common to wind the high-pressure side and low-pressure side conduits P ₁ and P ₂ together with tape, and the joint part will be large and the appearance will be poor. , And the wall must have large through holes to accommodate this.

In view of the above, the present invention aims to enable reliable and airtight connection and separation of high-pressure and low-pressure conduits connecting indoor and outdoor units of an air conditioner with only one set of pipe joints. And

[0007]

[Means for Solving the Problems]

 Based on the above-mentioned object, the present invention, as a pipe joint for an air conditioner, rotatably mounts a union nut projecting to the male joint side on the outer surface of a cylindrical female body and has one end on the non-male side end. A tube body closed by a cap body is joined, a cylindrical valve body is fixedly arranged in the inner center part of the female body, and an elastic seal is attached to the male end face and a part of the periphery in the female body. The sleeve valve body to which the material is fixed is spring-biased to the male side for fitting, and the valve core with the valve rod protruding is installed inside the male side end of the cylindrical valve body and the air conditioner is installed at the non-male side end. The first conduit connected to the high pressure side of the equipment is joined, while the cap body is connected to the second conduit connected to the low pressure side of the equipment, and an external taper is placed inside the female fitting side end of the cylindrical male body. An annular protrusion with a surface and an inner tapered surface is provided, and one end is closed with a cap at the end of the non-female joint side. The tube body is joined to the inside of the male body, and a cylindrical valve body with an elastic sealing material fixed to a part of the peripheral surface is fixedly arranged on the female end of this cylindrical valve body. In this case, a sleeve valve body with an elastic sealing material fixed to the female side edge is spring-biased to the female side for fitting and placement, and a valve core with a protruding valve rod is placed in the female side end of the tubular valve body. When attached, the first female conduit connected to the high-pressure side of the air conditioning equipment is joined to the non-female end, while the second conduit connected to the low-pressure side of the equipment is joined to the cap body.

[0008]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the female joint F and the male joint M separately. The female main body 1 is a thick tubular body with openings at both ends, and the end portion on the male joint side (hereinafter simply referred to as the male side) is It is stepped to form a thin-walled cylindrical portion 1a, and an annular groove 1b is provided substantially above the center portion thereof, and the proximal end portion of the union nut 2 having an internal thread 2a on its inner surface and projecting to the male side is The tube body 3 is rotatably attached, and the tube body 3 is airtightly joined to the non-male side end of the female body 1 by brazing, and the non-male side end of the tube body 3 is closed by a cap body 8. ..

At the center of the inside of the female body 1, a child-shaped tubular valve body 4 having a long length is arranged in a penetrating state with the head portion 4a on the male side, and its rear tubular portion serves as an end face of the female body. It is fixed by a retaining ring 5a to the boss portion of a tripod retainer 5 that is sandwiched between the throttle body 3 formed in the tube body 3 and between the female body 1 and the tubular valve body 4. Is fitted with a sleeve valve body 6 having an outer diameter substantially equal to the inner diameter of the female body 1 and elastic seal members 6a and 6b fixed or embedded in a part of the male end surface and the peripheral surface. It is biased to the male side by a coil spring 7 arranged between the male end face and the retainer 5, and when the joint is separated, the inner half of the elastic seal member 6a on the male end face is the cylindrical valve body 4. It prevents the internal fluid from leaking together with the elastic sealing material 6a on the peripheral surface which is in pressure contact with the collar 4b around the head of the female body 1 and is in close contact with the inner surface of the female body 1. It has stopped.

Further, a valve core 10 is screwed inside the male end of the tubular valve body 4, and its valve rod 10c is attached so as to project from the head portion 4a of the tubular valve body 4, This valve core 10 is well known, but its outline is as shown in FIG. 4. It has a threaded head 10a having a fluid inlet / outlet, a cylindrical portion 10b in which a coil spring 10e is installed, and a valve at the tip. The valve body 10d includes a body 10d and a valve rod 10c penetrating the head portion. The coil spring 10e normally seals the tip of the barrel portion 10b with the valve body 10d. By pushing in, the tip of the tubular portion 10b is opened, and the fluid passes through the inside of the tubular portion 10b.

On the other hand, a fine first conduit P ₁ is airtightly joined to the non-male side end of the tubular valve body 4, which is provided at a substantially central portion of the cap body 8 of the tube body 3. extends outwardly through a hole 8a, also mortise 8b is provided at an eccentric position of the cap body 8, there are second conduit P ₂ slightly chubby is being joined hermetically, female joint F Inside, independent fluid passages are formed inside and outside the cylindrical valve body 4, respectively.

The male body 11 of the male joint M is also a tubular body having openings at both ends, and a male screw 11a that is screwed into the female screw 2a of the union nut 2 of the female joint is provided on the end portion on the female joint side (hereinafter simply referred to as the female side). An annular groove 11c having an outer taper surface 11d that narrows toward the female side is formed on the female end surface, and an inner taper surface 11e that also narrows toward the female side is formed inside the female end portion. The protrusion 11b is provided, while the tube body 13 is hermetically joined to the non-female side end of the male body 11, and the non-female side end of the tube body 13 is closed by the cap body 18.

At the inner center of the male body 11, a female valve end is stepped with a thick wall, and a cylindrical valve body 14 in which an elastic sealing material 14a is embedded in the peripheral surface of the step is disposed. The center portion is fixed by a retaining ring 15a to the boss portion of a tripod-shaped retainer 15 sandwiched between the end surface of the male body and the squeezing groove 13a formed in the tube body 13. A sleeve valve body 16 is slidably fitted on the thick end portion of the cylindrical valve body 14 between the cylindrical valve body 14 and the sleeve valve body 16 and the outer diameter of the sleeve valve body 16 is a male body. The annular projection 11b is composed of a head portion 16a which is larger than the inner diameter and has an elastic sealing material 16c fixed to the end portion thereof, and a tubular portion 16b having a smaller diameter than this. A guide rod 19 is provided on the tubular portion 16b. With the coil spring 17 arranged between the rod 19 and the retainer 15, the sleeve valve body 16 is When the coupling is separated, the elastic seal member 16c at the female side edge is pressed against the inner taper surface 11e of the annular protrusion 11b at the time of separation of the joint, and comes into contact with the inner surface of the sleeve valve body 16. In cooperation with the elastic sealing material 14a, the internal fluid is prevented from leaking.

A valve core 10 similar to a female joint is screwed into the inside of the female side end portion of the tubular valve body 14, and its valve rod 10 c projects from the thick end portion of the tubular valve body 14. Installed in a state.

On the other hand, a fine first conduit P ₁ is airtightly joined to the non-female side end of the tubular valve body 14, which is provided substantially at the center of the cap body 18 of the tube body 13. extends outwardly through the hole 18a, also mortise 18b is provided at an eccentric position of the cap body 18, there are second conduit P ₂ slightly chubby is being joined hermetically, male joint In M, independent fluid passages are formed inside and outside the cylindrical valve body 14, respectively.

In use, the first conduit P ₁ joined to the female joint F as shown in FIG. 6 is connected to the inflow side (high pressure side) of the heat exchanger Hb of the indoor unit B and the second conduit P ₂ is connected. Is connected to the outflow side (low pressure side), and the first conduit P ₁ joined to the male joint M is to the outflow side (high pressure side) of the heat exchanger Ha of the outdoor unit A, and the second conduit P ₂ is the compressor. They are connected to the suction side (low pressure side) of C, respectively. (However, the positional relationship between the female and male joints F and M may be reversed from that in FIG. 6.)

Then, as shown in FIG. 2, when the union nut 2 of the female joint F is screwed into the male screw 11a of the male main body 11, the outer half of the elastic seal member 6a on the end face of the sleeve valve body 6 in the female main body is screwed. The portion abuts on the tip of the annular protrusion 11b of the male body 11, but in this state, the sleeve valve body 6 itself and the sleeve valve body 16 in the male body 11 do not move, and the female and male side cylinders do not move. The valve rods 10c of the valve cores 10 in the valve bodies 4 and 14 come close to each other, but are not in a mutually pressing relationship and are kept in the closed position. (Refrigerant) is kept airtight.

In this state, if the union nut 2 is further screwed in, the female sleeve valve body 6 moves backward against the spring force of the coil spring 7 as shown in FIG. Is separated from the peripheral edge 4b of the tubular valve body 4, the flow path is opened, the fluid exiting from the heat exchanger Hb of the indoor unit B and entering into the female body 1 through the second conduit P ₂ (gaseous (Coolant) flows to the male body 11 side. At this time, the outer half of the elastic sealing material 6a on the end face is in pressure contact with the tip of the annular protrusion 11b of the male body, so that the refrigerant leaks to the outside. Not.

On the other hand, the sleeve valve element 16 in the male main body 11 is pushed by the head portion 4a of the female cylindrical valve element 4 and moves back against the spring force of the coil spring 17. Has a flange portion 4b at the peripheral portion of the head portion of the female cylindrical valve body 4, which is in pressure contact with the elastic seal member 16c attached to the head end edge of the sleeve valve body 16. The sleeve valve body 16 moves backward while maintaining the airtightness inside and outside the tubular valve bodies 4 and 14.

When the sleeve valve body 16 begins to retreat in this way, the valve rods 10c of the valve cores 10 assembled inside the female-side and male-side tubular valve bodies 4 and 14 collide with each other and retreat from each other. As described above, the valve body opens the tip of the cylindrical portion, the flow passages inside the cylindrical valve bodies 4 and 14 are opened, and the heat is discharged from the heat exchanger Ha of the outdoor unit A to the first conduit P. _The fluid (liquid refrigerant) contained in the male-side tubular valve element 14 through ₁ flows to the female-side tubular valve element 4 and the first conduit P ₁ .

When the union nut 2 is screwed in continuously, the inner end edge of the thin-walled cylindrical portion 1a of the female body 1 is pressed against the outer taper surface 11a of the female side end surface of the male body 11, and the female joint F and the male joint M are illustrated. 3 and FIG. 6 are hermetically joined as shown by the dotted line.

Further, when the union nut 2 is rotated in the coupling state shown in FIG. 3, the sleeve valve elements 6 and 16 in the female and male main bodies 1 and 11 restore the coil springs 7 and 17, respectively. By force, the female sleeve valve body 6 automatically keeps airtight with the male annular projection 11b, and the male sleeve valve body 16 keeps airtightly with the head of the female cylindrical valve body 4. While returning to the original position, the female and male joints F and M are separated again as shown in FIG.

[0023]

[Effect of the device]

 As described above, in the present invention, as a pipe joint for an air conditioner, a fluid passage connected to the high pressure side and a fluid passage connected to the low pressure side of the equipment are formed in the female body of the female joint and the male body of the male joint, respectively. Since self-sealing valve elements are installed in each passage, the high-pressure and low-pressure side piping circuits can be connected and separated easily, reliably and airtightly with a single set of female and male pipe joints. Since it is not necessary to use one set of pipe fittings for each of the high-pressure side and the low-pressure side as in the past, the number of parts is reduced, and the connecting and separating work does not require much labor, so the installation work is There is no need to make a large hole in the wall.

[Brief description of drawings]

FIG. 1 is a half sectional side view showing a separated state of a pipe joint according to the present invention.

FIG. 2 is a half cross-sectional side view showing a half screwed state of the female and male joints.

FIG. 3 is a half cross-sectional side view showing the same coupling state.

FIG. 4 is a half cross-sectional side view of the valve core in a closed state.

FIG. 5 is a half sectional side view of the valve core in an open state.

FIG. 6 is a piping circuit diagram showing a usage state.

FIG. 7 is a half cross-sectional side view of a conventional pipe joint in a separated state.

FIG. 8 is a half sectional view showing the combined state.

FIG. 9 is a piping circuit diagram showing how the conventional product is used.

[Explanation of symbols]

F Female joint 1 Female body 2 Union nut 3 Tube body 4 Cylindrical valve body 4a
Head 5 Retainer 6 Sleeve valve body 8 Cap body M Male joint 11 Male body 13
Tube body 14 Cylindrical valve body 15 Retainer 16
Sleeve valve body 18 Cap body P ₁ First conduit P ₂
Second conduit

Claims (1)

[Scope of utility model registration request] 1. A union nut 2 extending over a male joint side is rotatably attached to an outer surface of a cylindrical female body 1, and a tube body 3 having one end closed by a cap body 8 is joined to a non-male side end. Then, the cylindrical valve body 4 is fixedly arranged at the inner center of the female body 1, and the elastic seal members 6a and 6b are fixed to the male body end face and a part of the peripheral surface in the female body 1. The sleeve valve element 6 is spring-biased toward the male side and is disposed so as to be fitted, and the valve core 10 with the valve rod 10c protruding is attached in the male side end portion of the tubular valve element 4 and the air conditioner is provided at the non-male side edge portion. The first to connect to the high voltage side of the equipment
While the conduit P ₁ is joined, the cap body 8 is joined to a female joint F to which a second conduit P ₂ connected to the low pressure side of the equipment is joined, and an outer taper surface is formed in the female joint side end of the cylindrical male body 11. 11d
An annular protrusion 11b having an inner tapered surface 11e is provided, and a tube body 18 having one end closed by a cap body 18 is joined to a non-female joint side end, and a male body 11 has an inner center portion with a circumferential surface. A tubular valve body 14 having an elastic sealing material 14a fixed thereto is fixedly arranged, and a sleeve having an elastic sealing material 16c fixed to a female side edge is provided on the female side end portion of the cylindrical valve body 14. The valve core 10 in which the valve body 16 is spring-biased toward the female side to be fitted therein, and the valve rod 10c is projected in the female side end portion of the tubular valve body 14.
A male joint M in which the first conduit P ₁ connected to the high pressure side of the air conditioner is connected to the non-female end and the second conduit P ₂ connected to the low pressure side of the device is bonded to the cap body 18 A pipe joint for an air conditioner.