JP2002276834A - Stop valve for coolant piping and stop valve for double pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve structure capable of sufficiently removing a coolant from a coolant piping prior to a disassembling. SOLUTION: In Fig. (a), a tip end fitting 42 of a coolant suction hose 41 is pushed from one end of a valve rod 18. A service valve 20 is opened by pushing a spindle 21 by the tip end fitting 42. If the service valve 20 is opened, the coolant 43 remaining in a valve seat ring 15 can be forcedly discharged through a through hole 19 by the coolant suction hose 41. The coolant remaining in a front space of a valve element can be completely removed and it can be prevented that the coolant is leaked to an external air at the time of disassembling and withdrawing the coolant piping. Accordingly, a preservation of an earth environment and a rupture prevention of an ozone layer can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for improving a stop valve for a refrigerant pipe and a stop valve for a double pipe.

[0002]

2. Description of the Related Art The present inventor has previously described Japanese Patent Application Laid-Open No. 11-3255.
No. 17, "refrigerant piping device for room air conditioner" provides a technology for reducing the diameter of a through hole in a building wall that is opened to pass a refrigerant pipe connecting an outdoor unit placed outdoors and an indoor unit placed indoors.

[0003]

However, it has been found that the technology disclosed in the above publication has the following problems. One of the problems in FIG. 15 is a structural problem that a small amount of refrigerant remains in the valve. Figure 1 of this publication
5 will be repeated to clarify the issues.

FIG. 10 is a view showing FIG. 15 reprinted in Japanese Patent Application Laid-Open No. H11-325517 and a problem. Using a refrigerant inlet / outlet mechanism 40 called a service valve, the copper pipe 10
5,105R, and the copper tube 105,
The refrigerant can be removed from 105R. However, in the closed state as shown in the figure, the refrigerant accumulated in the space Sc between the valve stem 101 and the valve stem 101R cannot be discharged.
The accumulated refrigerant flows out into the atmosphere when the flange 92 and the flange 92R are separated to the left and right as the pipe is dismantled. This is contrary to the idea that the refrigerant should not be released to the atmosphere in order to prevent the destruction of the ozone layer, and a technique that does not release the refrigerant to the atmosphere is required.

The second problem is that, as shown in FIG. 2 of the above-mentioned publication, since two refrigerant pipes 14 and 15 are passed through holes (holes 17 for a standard air conditioner) formed in a wall, there is a limit in reducing the diameter.
In order to solve this, a double pipe consisting of an inner pipe and an outer pipe is adopted, and the diameter of the hole 17 is reduced by flowing the outward refrigerant and the return refrigerant through this apparently single pipe (double pipe). That is desirable.

FIG. 11 is a view showing a problem when a double pipe is adopted. In FIG.
To provide a stop valve in the double pipe 150 that allows the return refrigerant to pass between the outer pipe 152 and the inner pipe 151, the inner pipe 151
Although it is easy to provide a stop valve 154 at the end, as shown in the figure, it is necessary to extend a bypass pipe 153 from the outer pipe 152 and provide a stop valve 155 in the bypass pipe 153.

As shown in FIG. 2, the main refrigerant pipe must pass through the hole 17 in the wall with the stop valve attached, and the structure of the stop valves 154 and 155 makes it difficult to pass through the hole 17. . In other words, even if a double pipe is adopted to achieve compactness, there is no stop valve suitable for this.

Accordingly, an object of the present invention is to provide a valve structure capable of sufficiently removing the refrigerant from the refrigerant pipe before disassembly and a valve structure suitable for a double pipe.

[0009]

According to a first aspect of the present invention, there is provided a stop valve for a refrigerant pipe for stopping a flow of a refrigerant by applying a valve element provided at a tip end of a valve rod to a valve seat. It is characterized in that a through hole is provided in the valve stem, and a service valve used for injecting or removing a refrigerant into or from this through hole is interposed.

If it is necessary to remove the refrigerant remaining in the space in front of the valve body, the refrigerant is removed by using a service valve built in the valve stem. This can prevent the refrigerant from leaking to the outside air when the refrigerant pipe is disassembled and removed.

According to a second aspect of the present invention, the stop valve for a refrigerant pipe is characterized in that the valve stem is inclined at an angle of 30 ° to 60 ° with respect to the axis of the refrigerant pipe.

By inclining the valve stem, the diameter or height of the stop valve for refrigerant piping can be reduced,
A compact stop valve for refrigerant piping can be achieved.

According to a third aspect of the invention, there is provided a double pipe stop valve, wherein a first flow path and a second flow path which are independent from each other are formed in a valve box.
A first valve seat is formed in a first flow passage, a first valve rod having a first valve body corresponding to the first valve seat is attached to a valve box, and a second valve seat is provided in a second flow passage. A second valve stem provided with a second valve body corresponding to the second valve seat is attached to a valve box, and a connection portion of the valve box with a connection pipe has a double pipe structure including an inner pipe and an outer pipe. It is characterized by having done.

By connecting the inner pipes of the front and rear double pipes to the inner pipe of the double pipe stop valve and connecting the outer pipes of the front and rear double pipes to the outer pipe of the double pipe stop valve, the front and rear double pipes are connected. The heavy pipe can be connected directly to the double pipe stop valve.

According to a fourth aspect of the present invention, there is provided a stop valve for a double pipe, wherein a through hole is provided in at least one of the first valve stem and the second valve stem, and a service valve used for injecting or removing a refrigerant into or from the through hole is provided. It is characterized by having made it.

If it is necessary to remove the refrigerant remaining in the space in front of the first valve body or the second valve body, the refrigerant is removed using a service valve built in the first valve rod or the second valve rod.
This can prevent the refrigerant from leaking to the outside air when the refrigerant pipe is disassembled and removed.

According to a fifth aspect of the invention, there is provided a double pipe stop valve, wherein the first valve stem and the second valve stem are inclined at an angle of 30 ° to 60 ° with respect to the axis of the inner pipe.

By inclining the first valve stem and the second valve stem, the diameter or height of the double pipe stop valve can be reduced, so that the double pipe stop valve can be made compact.

[0019]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a cross-sectional view of a refrigerant pipe stop valve according to the present invention.
1 and a refrigerant pipe (short pipe) 12 attached to the valve box 11
A flow path 13 formed in the valve box 11, a valve seat ring 15 screwed into the valve box 11 so as to interpose a valve seat 14 in the flow path 13, and a valve body 17 corresponding to the valve seat 14. , A valve stem 18 screwed into the valve box 11, a through hole 19 formed in the valve stem 18, and a service valve 20 interposed in the through hole 19 (detailed structure will be described later).
, A hexagonal hole 31 provided at one end of the valve stem 18, a tool hooking portion 32, 32, and a cap 33 screwed into the valve box 11 to cover the valve stem 18. This cap 33 is a screw cap having a female screw. 34 is an O-ring, 35 is a gasket, and 36 is a flange.

The service valve 20 includes a small valve body 23 having spindles 21 and 22 extending forward and backward, and a small valve seat 24.
A retaining ring 25 for holding down the small valve seat 24;
And a spring 25 that presses the small valve seat 24 to the small valve seat 24. The figure shows a valve closed state where the small valve element 23 is in close contact with the small valve seat 24. The retaining ring 25 is a nut having a hole substantially in the center.

The operation of the refrigerant pipe stop valve having the above configuration will be described with reference to FIGS. 2 (a) and 2 (b) are action diagrams (part 1) of the refrigerant pipe stop valve according to the present invention. (A), the valve stem 18 retreats, the valve element 17 and the valve seat 1
4 shows a refrigerant pipe stop valve 10 in a valve open state where a predetermined gap T exists between the stop valve 10 and the stop valve 10. Since the valve is open, the refrigerant 37 flows freely from the refrigerant pipe (short pipe) 12 to the valve seat ring 15 or from the valve seat ring 15 to the refrigerant pipe (short pipe) 12. In order to close the refrigerant pipe stop valve 10, the following procedure is followed.

In (b), the cap 33 is removed using a piping tool such as a pipe wrench, and the spanner 3 is attached to the valve stem 18.
An 8 or hexagon wrench is hung and turned, and the valve body 17 is pressed strongly against the valve seat 14. This brings the valve into a closed state.

FIGS. 3 (a) and 3 (b) are action diagrams (part 2) of the refrigerant pipe stop valve according to the present invention. In (a), the tip fitting 42 of the refrigerant suction hose 41 is screwed in from one end of the valve stem 18. Pushing the spindle 21 with the tip fitting 42 opens the service valve 20. When the service valve 20 is opened, the refrigerant 43 remaining in the valve seat ring 15 through the through hole 19 can be forcibly discharged by the refrigerant suction hose 41. After the refrigerant is discharged, the distal end fitting 42 is removed, but at this time, the valve stem 18 cannot rotate to the valve opening side. Therefore, when the tip fitting 42 is attached or detached, the valve stem 18 is held down by the spanner 38 to prevent rotation.

FIG. 2B shows a so-called "containment" state, in which the refrigerant 37 is enclosed in the refrigerant pipe (short pipe) 12 by the shut-off action of the refrigerant pipe stop valve 10 of the present invention. If the cap 33 is attached to the valve box 11, there is no possibility that the refrigerant 37 leaks outside. Thereafter, the flange 36 may be removed from the flange 36L, and the refrigerant 37 may be conveyed to the transfer destination while the refrigerant 37 is sealed in the refrigerant pipe (short pipe) 12, that is, while the refrigerant 37 is sealed in the refrigerant pipe, or may be conveyed to the refrigerant processing plant. .

As is clear from the above description, when the refrigerant pipe is disassembled, the refrigerant remaining in the seam can be suctioned without being released to the outside air.

FIG. 4 is a cross-sectional view of the twin-type stop valve for refrigerant piping according to the present invention. The same type of stop valve for refrigerant piping 10L (L is attached to the flange 36 of the refrigerant piping stop valve 10 described in FIG. Shown on the left, the same applies hereinafter) Flange 3
By combining the 6Ls and connecting them with bolts 44 (... indicates a plurality, the same applies hereinafter), a twin-type stop valve 50 for refrigerant piping can be obtained. The internal structure of the valves 10 and 10L will be omitted from the description of FIG.

The axis 51 of the refrigerant pipe (short pipe) 12
The valve stem 18 is inclined at an angle θ (θ <90 °). By inclining in this manner, the maximum height H1 defined by the height from one cap 33 to the other cap 33L can be reduced. That is, since the maximum height H1 has an important effect on the diameter of the through hole formed in the body wall, it is desirable that the maximum height H1 be small.

The angle θ may be selected from the range of 30 ° to 60 °. If the angle is less than 30 °, there is a structural difficulty that the cap 33 easily contacts the refrigerant pipe (short pipe) 12, and if the angle exceeds 60 °, the maximum height H1 does not become so small.

FIG. 5 is a view showing another embodiment of FIG. 4. In the valve stem 18 of FIG. 4, both hexagonal holes 31 and tool hooks 32, 32 are provided to facilitate the construction. FIG. 5 shows the hexagonal hole 31 omitted. That is, the valve stems 18 and 18L were shortened and covered with compact caps 52 and 52L. As a result,
The maximum height H2 is about 20% smaller than the height H1.
The structure shown in FIG. 5 can be applied to FIGS. 1 to 3 and FIGS.

FIG. 6 is a cross-sectional view of a header structure using the refrigerant pipe stop valve of the present invention. Generally, a header has a distribution header having one inlet and a plurality of outlets, and a header having a plurality of inlets and an outlet. There is a collective header which is one, and both are indispensable parts for a large-scale refrigerant pipe.

The distribution header 55 for that purpose is a cylinder 56
A blind flange 57 closing one end of the cylindrical body 56; and a stop valve 10B for the inlet side refrigerant pipe provided at the other end of the cylindrical body 56.
And a plurality of branch-side refrigerant pipe stop valves 10C to 10F arranged on the side surface of the cylindrical body 56. The structure of these branch-side refrigerant pipe stop valves 10C to 10F is difficult to understand, and will be described with reference to the next figure. In addition, the stop valve for refrigerant pipes given the reference numerals 10B to 10F has the same structure as the stop valve for refrigerant pipe 10 described with reference to FIG. 1. Attached. Refrigerant piping (short pipe)
The same applies to 12B to 12F.

FIG. 7 is a sectional view taken along line 7-7 of FIG. 6, and shows a refrigerant pipe (short pipe) 12 of a branch side refrigerant pipe stop valve 10D.
D indicates that it extends so as to bypass under the valve stem 18D and the cap 33D. Only when the branch-side refrigerant pipe stop valve 10D is opened, the refrigerant in the cylinder 56 flows to the refrigerant pipe (short pipe) 12D. Although the cylindrical body 56 is shown as a square cylinder, it may be a circular cylinder.

Returning to FIG. 6, the refrigerant supplied to the cylinder 56 through the refrigerant pipe (short pipe) 12B of the inlet-side refrigerant pipe stop valve 10B is supplied to the branch-side refrigerant pipe stop valves 10C to 10C.
10F can be discharged from all or selected ones.

It is needless to say that the refrigerant can be sealed in the cylinder 56 by closing the inlet side refrigerant pipe stop valve 10B and the branch side refrigerant pipe stop valves 10C to 10F. In addition, if the flow of the refrigerant is reversed, the distribution header 55 can be used as a collective header.

The injection or withdrawal of the refrigerant can be performed by the service valve 20B attached to the inlet-side refrigerant pipe stop valve 10B. Therefore, it is not always necessary to attach the service valves 20C to 20F to the branch side refrigerant pipe stop valves 10C to 10F. However, if it is not desired to increase the types of valves, service valves 20B to 20F are attached to all valves as shown in the figure. In other words, at least one of the refrigerant pipe stop valves connected to the distribution header 55 is provided with the service valve 20B or the like, and whether or not all the valves are provided with the service valves 20B to 20F may be appropriately determined. That is.

Next, the stop valve for a double pipe will be described.
FIG. 8 is a cross-sectional view of a double pipe stop valve according to the present invention. A double pipe stop valve 60 includes first and second flow paths 62 and 62 and a second flow path 63 and 63, a first valve seat 64 is formed in the first flow path 62, and a first valve rod 66 having a first valve body 65 corresponding to the first valve seat 64 is attached to the valve box 61. , A second valve seat 67 is formed in the second flow passage 63, and the second valve body 6 corresponding to the second valve seat 67 is formed.
8 is attached to the valve box 61,
Both the connecting portions 71 and 72 with the connection pipe of the inner pipe 73
And an outer tube 74.

An external thread 75 is provided at the end of the inner tube 73 on the right side of the figure.
A flange 76 is provided at the end of the outer tube 74 on the left side of the figure. Valve body 65,
In order to remove the refrigerant at the front 68, it is desirable that the service valves 20, 20 be built in the first valve stem 66 and the second valve stem 69.

The operation of the double pipe stop valve 60 will be described. If the first valve body 65 is separated from the first valve seat 64 by twisting the first valve rod 66, the first flow paths 62, 62 will be described. The refrigerant can be flowed through. Similarly, if the second valve rod 68 is separated from the second valve seat 67 by twisting the second valve rod 69, the refrigerant can flow through the second flow paths 63, 63. In this double pipe stop valve 60, the first flow path 62
Is independent of the second flow path 63, and there is no fear that the refrigerant on the outward path and the refrigerant on the return path are mixed.

FIG. 9 is a cross-sectional view of a twin-tube twin stop valve according to the present invention. The flange 76 of the double-tube stop valve 60 described with reference to FIG.
By joining the flanges 76L of the L and connecting them with the bolts 44..., The twin type stop valve 80 for a double pipe can be obtained.

The valve rod 69 is inclined at an angle θ (θ <90 °) with respect to the axis 77 of the inner pipe 73. By tilting in this manner, one of the caps 33
The maximum height H3 defined by the height from the to the other cap 33 can be reduced. That is, since the maximum height H3 has an important influence on the diameter of the through hole formed in the skeleton wall, it is preferable that the maximum height H3 is small.

The angle θ may be selected from the range of 30 ° to 60 °. If less than 30 °, the cap 33 is the outer tube 63
There is a structural difficulty that makes it easy to contact
This is because if the value exceeds ゜, the maximum height H3 does not become so small.

By the way, the twin type stop valve 8 for double pipes
In order to attach the double pipe 82 to the inner pipe 83,
From the outer tube 84. The inner tube 83 is a flexible part 85
Can be withdrawn. The socket 86 at the tip of the drawn inner pipe 83 is screwed into the male screw portion 75L of the inner pipe 73L on the stop valve 80 side. The sealing performance is ensured by interposing a ring packing having a rhombic cross section in the socket 86. Next, the flange 87 of the outer pipe 84 is aligned with the flange 88L of the stop valve 80, and is fastened with bolts 89.

In the refrigerant pipe stop valve of the first aspect, the presence or absence of the inclination of the valve rod is optional. Similarly, claim 3
In the stop valve for double pipes 4, the presence or absence of inclination of the valve stem is optional. In the stop valve for a double pipe according to the third aspect, the presence or absence of the service valve is optional. The stop valve for a double pipe according to claims 3 to 5 is provided with two types of pipes such as a double pipe for hot / cold water, a double pipe for purified water / sewage, and a double pipe for water / oil, in addition to being interposed in the double pipe for refrigerant. It can be applied to all of the double tubes through which the medium flows.

[0044]

According to the present invention, the following effects are exhibited by the above configuration. According to the refrigerant pipe stop valve of the first aspect, the refrigerant remaining in the space in front of the valve body can be completely removed, and the refrigerant is prevented from leaking to the outside air when the refrigerant pipe is disassembled and removed. Can be. Therefore, according to the first aspect, protection of the global environment and prevention of destruction of the ozone layer can be achieved.

The refrigerant pipe stop valve according to the present invention is characterized in that the valve stem is inclined by 30 ° to 60 ° with respect to the axis of the refrigerant pipe. The diameter or height of the valve can be reduced, and the stop valve for refrigerant piping can be made more compact.

According to the third aspect of the present invention, the inner pipes of the front and rear double pipes are connected to the inner pipes of the double pipe stop valve, and the outer pipes of the front and rear double pipes are connected to the double pipe stop valve. By connecting to the outer pipe of the stop valve, the front and rear double pipes can be directly connected to the double pipe stop valve. Therefore, the stop valve can be easily interposed in the double pipe, and the appearance is improved.

In the stop valve for a double pipe according to the fourth aspect, a through hole is provided in at least one of the first valve stem and the second valve stem, and a service valve used for injecting or removing the refrigerant into or from the through hole is provided. The refrigerant remaining in the space in front of the first and second valve bodies can be completely removed, and the refrigerant is prevented from leaking to the outside air when the double pipe is disassembled and removed. Can be. Therefore, according to the fourth aspect, it is possible to protect the global environment and prevent destruction of the ozone layer.

According to the fifth aspect of the present invention, the diameter or height of the double pipe stop valve can be reduced by inclining the first valve stem and the second valve stem. The stop valve can be made more compact.

[Brief description of the drawings]

FIG. 1 is a sectional view of a refrigerant pipe stop valve according to the present invention.

FIG. 2 is an operation view of a stop valve for a refrigerant pipe according to the present invention (part 1).

FIG. 3 is an operation view of a refrigerant pipe stop valve according to the present invention (part 2).

FIG. 4 is a sectional view of a twin-type stop valve for a refrigerant pipe according to the present invention.

FIG. 5 is a view showing another embodiment of FIG. 4;

FIG. 6 is a sectional view of a header structure using the refrigerant pipe stop valve of the present invention.

FIG. 7 is a sectional view taken along line 7-7 of FIG. 6;

FIG. 8 is a sectional view of a stop valve for a double pipe according to the present invention.

FIG. 9 is a sectional view of a twin-type stop valve for a double pipe according to the present invention.

FIG. 10 is a diagram reprinted from FIG. 15 of Japanese Patent Application Laid-Open No. 11-325517 and a diagram showing a problem.

FIG. 11 is a diagram showing a problem when a double pipe is adopted.

[Explanation of symbols]

10, 10L: stop valve for refrigerant piping, 11, 61: valve box, 13: flow path, 14: valve seat, 17: valve body, 18: valve rod, 19: through hole, 20: service valve, 50: refrigerant Twin stop valve for piping, 51, 77 ... axis, 60,
60L: stop valve for double pipe, 62: first flow path, 63
... second flow path, 64 ... first valve seat, 65 ... first valve body, 66
... first valve stem, 67 ... second valve seat, 68 ... second valve body, 69 ...
2nd valve stem, 71, 72 ... fitting part, 80 ... twin type stop valve for double pipes, (theta) ... inclination angle.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F16K 51/00 F16K 51/00 C F25B 41/04 F25B 41/04 Z 45/00 45/00 F

Claims (5)

[Claims] 1. A refrigerant pipe stop valve for stopping a flow of refrigerant by applying a valve element provided at a tip end of a valve rod to a valve seat, wherein the valve rod has a through hole, and the refrigerant is injected into the through hole. Alternatively, a stop valve for refrigerant piping characterized by interposing a service valve used at the time of removal. 2. A valve stem having an angle of 30.degree.
2. The stop valve for a refrigerant pipe according to claim 1, wherein the stop valve is inclined at 60 [deg.]. 3. A first flow path and a second flow path, which are independent from each other, are formed in a valve box, and a first valve seat is formed in the first flow path.
A first valve stem having a first valve body corresponding to the first valve seat is attached to the valve box, a second valve seat is formed in a second flow passage, and a second valve seat corresponding to the second valve seat is formed. A double-pipe stop valve, wherein a second valve stem having a valve body is attached to the valve box, and a connection portion of the valve box with a connection pipe has a double-pipe structure including an inner pipe and an outer pipe. 4. A method according to claim 1, wherein at least one of said first valve stem and said second valve stem has a through-hole, and a service valve used for injecting or removing a refrigerant into or from said through-hole is interposed. Item 6. The stop valve for a double pipe according to Item 3. 5. The double pipe stop according to claim 3, wherein the first valve stem and the second valve stem are inclined by 30 ° to 60 ° with respect to the axis of the inner pipe. valve.