JP3143383B2 - On / off valve of air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner of a type in which a heat source side unit and a use side unit are separated from each other. The present invention relates to improvement of an on-off valve such as a three-way valve or a two-way valve having a function of operating.

[0002]

2. Description of the Related Art FIG. 7 shows a refrigeration cycle in an air conditioner which is divided into a heat source side unit and a use side unit as indicated by a dashed line L. 20, a heat source side heat exchanger 21, a cooling capillary tube 22, a check valve 30 for controlling the flow of refrigerant to the heating capillary tube 26 during heating, and a check valve 30 for reversing the refrigerant flow direction.
The use side unit is equipped with a use side heat exchanger 23, and the heat source side unit and the use side unit are connected to the refrigerant pipes 3 and 4 of each unit at the installation location. To complete the refrigeration circuit.

[0003] Here, when connecting the pipes between the units, a three-way valve 1B and a two-way valve 1C called service valves are provided to enable charging and recovery of the refrigerant.
The refrigerant pipes between the units are connected. 29
Is the use side heat exchanger 23 of the use side unit during the defrosting operation.
And a hot gas supply control valve disposed in a pipe line 38 provided to perform a defrost by directly supplying a high-temperature refrigerant gas (hot gas) from a compressor bypassing the heat source side heat exchanger 21.

By the way, a three-way valve and a two-way valve opening / closing valve 1 for relay-connecting the refrigerant pipes 3 and 4 between the units.
B and 1C are installed via a valve base on the upper surface of the case portion of the main body case of the heat source side unit. If the valve base is mounted at a location where strength is weak, for example, the three-way valve 1B ( As an example, as shown in FIG. 4, as shown in FIG. 4, the refrigerant pipe 3 on the use side unit is flared and connected to the connection port of the on-off valve 1B, and a tool such as a monkey wrench 8 is used. Other tools include a wrench, a torque wrench, etc., which will be described below using a monkey wrench). When the connection nut 5 (referred to as a flare nut) is tightened with a tightening rotation power, the tool is referred to in FIG. Screws 12 and 12 fixing the valve base 11 may loosen, and the mounting state of the on-off valve 1B may fluctuate. Therefore, do not move the on-off valve 1B with another monkey wrench 9. It is necessary to consider to allow 2 chome meshing on the valve body portion for holding down.

In this case, as a conventional method, first, as shown in FIGS. 4 and 5, the blade of the monkey wrench 9 is held at the center of the body 2 of the on-off valve (three-way valve) 1B. Flat portions 7B, 7B serving as holding portions for
Are provided facing each other, and a monkey wrench 9 for holding is obliquely hung on the flat portions 7B, 7B so as not to hit the cap portion 6 for changing the flow path which is screwed on the upper portion.
There is a method of tightening the pipe 3. Note that, in this case, generally, the flat portion 7B,
The distance dimension W2 between 7B is slightly smaller.

As another method, in the case of a large-scale air conditioner for business use, as shown in FIG. 6, the connecting pipe portion of the on-off valve 1B is intentionally lengthened, and a monkey wrench is attached to the extension pipe portion 2d. A fixing nut 10 for holding the nozzle 9 is provided coaxially with the flare nut 5.

[0007]

However, in the former case shown in FIGS. 4 and 5, the monkey wrench 9 is angled so as not to come into contact with the cap 6, so that no force is applied at the time of tightening and it is difficult to tighten. However, there is a danger that the monkey wrench 9 will come off if it is forcibly tightened. With the cap 6 of the on-off valve 1B removed, the monkey wrench 9
In addition, there is a danger that the screw portion 6c of the cap attaching portion may be crushed by mistake with the monkey wrench 9 during the pipe connection operation.

On the other hand, in the latter case shown in FIG.
Since the structure has the extension pipe portion 2d elongated in B, not only the material cost of the on-off valve 1B itself increases, but also the balance of the valve as a whole deteriorates, and the mountability to the valve base is deteriorated. There is a problem that many parts are thrown away as burrs during forging, which is uneconomical and costly.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has a skill in providing a flat portion which is a holding portion of a monkey wrench, for example, at a convenient position where a blade portion of a monkey wrench is held together with the opposite side of a cap. It is an object of the present invention to provide an on-off valve of an air conditioner that can improve the manufacturability, reduce the cost, and easily connect the refrigerant pipes between units by conventional structural improvements.

[0010]

In order to achieve the above object, the invention of claim 1 comprises a heat source side unit equipped with a compressor, a heat source side heat exchanger, a pressure reducing device and the like, and a use side heat exchanger. The heat source side unit refrigerant pipe and the use side unit refrigerant pipe are connected to each other via an on-off valve that enables switching of a flow path for charging / recovering refrigerant, which is separated into a mounted use side unit,
In an air conditioner configured to form a refrigeration cycle, when an inter-unit refrigerant pipe is tightened and connected to a connection port of the on-off valve by a jig, a jig for holding down the on-off valve body is fixed to the on-off valve. A holding portion is provided in a part of the valve main body so that the holding portion can be held together with the upper flow path switching cap provided.

According to a second aspect of the present invention, the grip portion is formed as a rectangular flat portion, and the flat portion is provided at an upper position on the valve body so as to be near the cap.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same or corresponding components as those of the conventional structure are denoted by the same reference numerals.

As shown in FIGS. 1 and 2, according to the present invention, the flat portions 7, 7 serving as holding margins for holding the fixed-side monkey wrench 9 are provided with a conventional on-off valve 1B as shown in FIG. The position of the upper portion of the cap 6 is changed from the position at the center of the body portion 2 to the upper portion, and the blade portions 14, 14 of the adjustable wrench 9 have an arbitrary face 6A of the hexagonal cap 6 as shown in FIG. , 6A are formed so as to be able to be held together with the flat portions 7, 7.

By adding the cap 6 and a part of the valve body, that is, the flat portions 7, 7, a mating wrench (flare nut) 8 as shown in FIG.
Since it is possible to have a sufficient holding force against the moment of, and to be able to firmly hold the on-off valve 1,
Tightening work of pipe connection can be performed smoothly.

Further, when the cap portion 6 is also used to hold the blade, the conventional flat portions 7B, 7B alone are used to hold the blade of the monkey wrench 9.
Since the holding margin can be reduced, the flat portions 7, 7 having a small shape are sufficient, so that the balance at the time of forging the on-off valve 1 is improved, and the material cost is also reduced.

Incidentally, when the cap 6 is fully opened when actually holding with the adjustable wrench 9, the flat portions 7, 7 of the valve body 2 and the facing surfaces 6A, 6A of the cap 6 do not necessarily become the same surface. The cap is slightly loosened (may be loosened at an angle not to be less than 60 degrees) as the same plane, that is, as shown in FIG.
It is preferable that the distance W2 between the flat portions 7 is the same as that of the flat portion 7 so that the monkey wrench 9 is held.

Next, the holding dimensions of the flat portions 7, 7 and the blade portions 14, 14 of the adjustable wrench 9 will be specifically described. The depth of the mouth of the adjustable wrench 9 and the like is limited.
The flat portions 7, 7 of the valve body need to be provided as close as possible to the position of the cap 6 when the cap is fully closed. That is, 3
In the two-way valve, the tightening specified torque of the ／ inch flare nut is 350 to 400 kgf · cm.
0 mm) is common, so that the fixed-side monkey wrench 8 is preferably the same size.

Here, in the case of the monkey wrench 9 having a nominal size of 250 mm, the holding margin is about 250 mm. Therefore, as shown in FIG. 3, from the upper part of the cap 6 to the lower part of the flat parts 7, 7 of the valve body in the fully closed state as shown in FIG. Is required to be about 25 mm.

When a 1/4 inch flare nut is used in a two-way valve, the specified tightening torque is 1
Since it is 50 to 200 kgf · cm, the nominal size is 200 mm (total length 210 mm) in the case of a monkey wrench, but since the cap is also added, the nominal size is 250 mm.

[0020]

As described above, according to the first aspect of the present invention,
In an air conditioner having a structure separated into a heat source side unit and a use side unit, when connecting refrigerant piping between units, the jig and tool such as a monkey wrench for pipe connection become two hooks and an on-off valve for pipe connection relay. A tool such as a monkey wrench that holds the main body and retains its fixed state so as not to damage it is designed so that a part of the valve main body and the cap at the top of the valve main body can be hooked. The valve body can be firmly fixed with a sufficient holding force against the moment of a jig such as a monkey wrench, and the pipe connection work is facilitated.

In addition, since a monkey wrench and the like are added together with the cap, the holding portion provided on the valve body can be small in area, so that material can be reduced and the manufacturing cost of the on-off valve can be reduced. The balance at the time of forging is improved and burrs are reduced, so that the effect of improving the productivity can be obtained.

According to the second aspect of the present invention, since the holding portion is provided on the upper portion of the valve body, the size of a monkey wrench or the like to be used is limited because pipe connection work is performed in a narrow place. Even so, a sufficient margin can be secured for any of these monkey wrenches and the like, and the versatility of the jigs and tools is expanded, and the work becomes easy.

[Brief description of the drawings]

FIG. 1 is a front structural view of an on-off valve having a structure in which a monkey wrench according to the present invention has a holding portion together with a cap.

FIG. 2 is a side view of an on-off valve having the same configuration as above.

FIG. 3 is an explanatory view showing an aspect when connecting the refrigerant pipe by pressing the on-off valve having the structure shown in FIG. 1 with a monkey wrench.

FIG. 4 is a front view of an on-off valve having a conventional structure for explaining a disadvantage that a tightening method is weakened.

FIG. 5 is a side view of a conventional on-off valve having the same configuration as above.

FIG. 6 is a front view of an on-off valve of another conventional structure having a disadvantage that the structure becomes large.

FIG. 7 is a refrigeration cycle diagram in an air conditioner having a structure in which a heat source side unit and a use side unit are separated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 On-off valve 2 Valve body 3 and 4 Refrigerant pipe 5 Nut for pipe connection 6 Cap for flow path switching 7 Flat part (holding part) 8, 9 Monkey wrench

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 57-95569 (JP, U) Japanese Utility Model Showa 63-69958 (JP, U) Japanese Utility Model Showa 51-113823 (JP, U) Japanese Utility Model Showa 62- 86475 (JP, U) Fully open sho 63-77168 (JP, U) Really open 4-4-136478 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F25B 41/00 F16K 43 / 00

Claims (2)

(57) [Claims] 1. A heat source side unit having a compressor, a heat source side heat exchanger, a decompression device, etc., and a use side unit having a use side heat exchanger, and a heat source side unit refrigerant pipe and a use side unit refrigerant. In an air conditioner that is connected to a pipe via an on-off valve that enables switching of a flow path for charging / recovering refrigerant to form a refrigeration cycle, the connection port of the on-off valve When the refrigerant pipe is tightened and connected by a jig, the jig for holding and holding the on-off valve main body can be held together with the upper flow path switching cap provided on the on-off valve. An on-off valve for an air conditioner, which is provided in a part of a main body. 2. The grip portion is a rectangular flat portion,
The on-off valve for an air conditioner according to claim 1, wherein the flat portion is provided at an upper position of the valve body so as to be near the cap.