JP4249436B2 - Seal structure using union packing and meter unit having the seal structure - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a union packing, and more specifically, to a seal structure using a union packing at a connection portion between a water pipe and equipment. Furthermore, this invention relates to the meter unit provided with the sealing structure.
[0002]
[Prior art]
So-called union packings or flat packings are often used to perform sealing at connecting portions of various pipes or other equipment. This packing is also used in water supply pipes or equipment connections, but most of the water supply business is managed by local water utilities, and various types of equipment are designated for management purposes. In many cases, the use of union packing is specified for seals at specific locations.
[0003]
FIG. 1 is a diagram showing an example of a water meter and piping connected using a union packing, (A) is a front view with a section of the piping, and (B) is (B). 3 is an enlarged view of a portion indicated by reference sign A. FIG.
[0004]
In the figure, reference numeral 1 denotes a water meter, that is, a meter, and an upstream side pipe 4 and a downstream side pipe 5 are connected to an upstream side connection part 2 and a downstream side connection part 3, respectively. In this example, the connection structure on the upstream side and the downstream side is the same, so only the connection structure on the upstream side will be described.
[0005]
A male screw 2 b is formed on the outer periphery of the connection portion 2 of the meter 1, while a flange portion 4 b having a slightly larger outer diameter is formed on the end portion of the pipe 4. Then, the union packing 5 is disposed between the end surface 2a of the connecting portion 2 and the end surface 4a of the pipe 4, and the cap nut 6 is screwed into the screw 2b of the connecting portion 2 as shown in the drawing and tightened to compress the packing 5. To do. At this time, since the union packing 5 is compressed on the entire surface, a large torque is required for tightening the nut 6, and this tightening is performed using a normal tightening tool.
[0006]
Further, the normally used union packing 5 is made of rubber or the like, and since the compression force at the time of use is large, the elasticity is lost with the passage of time and the sealing performance is often deteriorated. However, unless it is tightened with such a torque, good sealing performance cannot often be obtained in the initial stage of installation.
[0007]
By the way, the applicant has proposed a meter unit suitable for detachably mounting a meter in a narrow installation place such as a pipe shaft of an apartment house, for example, in Japanese Patent Application No. 8-119540. This is a piping or equipment that slides the slide member on the base by rotating the rotating member, contacts the end of the slide member to one connecting portion of the meter, and connects the meter to the other connecting portion. Is pressed toward the surface, thereby fixing the meter and sealing the connecting portion. At this time, for example, an O-ring is used as the sealing member, and the rotating member can be rotated by hand to ensure sufficient sealing performance.
[0008]
However, as mentioned above, a specific seal member used for such a connection part is often specified by each water utility, and the business that has traditionally determined the use of union packing instead of O-rings. There are many bodies. However, the above-described method is generally used for using the union packing. On the other hand, since the tightening with the meter unit is an operation in a narrow place, it is necessary to obtain a sufficient sealing performance by tightening with a small torque by hand without using a tightening tool.
[0009]
[Problems to be solved by the invention]
This invention is made | formed in view of the said conventional problem, and makes it the subject to provide the seal structure using the union packing which can obtain sufficient sealing performance with a small torque. Another object of the present invention is to provide a sealing structure for water supply equipment using such a union packing, and further to provide a meter unit having such a sealing structure.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the seal structure using the union packing according to the present invention, the first and second members provided with the holes communicating with each other opened at the end faces of the respective connecting portions contacting each other. An annular cross-section square groove capable of receiving a rubber union packing having a substantially uniform thickness is formed around the opening on either end face of the connection portion, and the bottom of the groove is The end surface of the annular convex portion formed between the inner periphery of the hole and the inner periphery of the hole is inclined so as to approach the end surface as it goes radially outward of the opening. It formed so that it might be located between the said connection part end surface and the bottom part of the said groove | channel in the axial direction of a hole .
In addition, the first and second water supply equipment provided with holes communicating with each other that are opened at the end faces of the respective connection portions, and between the end faces of the respective connection portions , the entire section has a substantially uniform thickness. In a seal structure for water supply equipment in which a rubber union packing is arranged and the space between the first and second connecting portion end faces abutting each other by compressing the union packing, the connection between the first and second equipment An annular cross-section square groove capable of receiving the union packing is formed around the opening on either end face of the opening, and the bottom of the groove is connected to the end face of the opening as it goes radially outward of the opening. The end surface of the annular convex portion formed between the radially inner periphery of the groove and the inner periphery of the hole is in the axial direction of the hole and the connection portion end surface. located between the bottom of the groove It was formed in.
Furthermore, in the meter unit according to the present invention, the unit is disposed between the base, first and second water supply equipment such as a valve attached to the base at both ends of the base, and the first and second equipment. The meter is placed between this meter and one of the first and second equipments, and is attached to one of the equipments, and is detachable by pressing the meter toward the other equipment. It consists of a detachable device that connects and fixes. The first equipment has an upstream corresponding connection connected to the upstream connection of the meter, the second equipment has a downstream compatible connection connected to the downstream connection of the meter, and the attachment / detachment device has an upstream connection. Connected to one end of the meter, corresponding to the one end of the connection corresponding to the upstream side and the connection corresponding to the downstream side. And an end-side connection portion. This attachment / detachment device includes the one end side connection portion, and is provided with a rotation member that is rotatable and non-movable in the axial direction with respect to the one piece of equipment, and is provided with the other end side connection portion and is prevented from rotating. And a sliding member that is screwed onto the rotating member and moves axially relative to the rotating member when the rotating member rotates. The first and first equipments, the meter, the rotating member, and the slide member communicate with each other through communication holes formed therein, and the end surface of the other end side connection portion of the slide member that contacts each other and the one connection portion of the meter between the end face and between the other end face of the connecting portion of the end surface and the meter of the connecting portion of the other gear to abut each other, a rubber union packing a rectangular cross section of the total substantially uniform thickness Be placed. An annular cross-sectional square groove capable of receiving a union packing is formed around the opening of each communication hole at the end surface of the other end side connection portion of the slide member and the end surface of the connection portion of the other equipment. The depth of the groove is inclined so as to approach the end face of the connecting portion as it goes radially outward of the opening, and is formed between the radially inner periphery of the groove and the inner periphery of the hole. The end surface of the annular convex portion is positioned between the end surface of the connecting portion and the bottom of the groove in the axial direction of the hole.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, the scope of the present invention is not limited to the embodiments described below. FIG. 2 is a side sectional view of the meter unit 11 according to the embodiment of the present invention, and the meter is indicated by a two-dot chain line. FIG. 3 is an enlarged view of a portion indicated by a symbol B in FIG.
[0012]
The meter unit 11 includes a base 12 having rigidity as shown in a side sectional shape. The unit 11 is attached to the floor surface or side wall surface of the pipe shaft of the apartment house, for example, via the base 12.
[0013]
On the upstream side (left side in the figure) of the base 12, as the first water supply equipment, in this embodiment, the stop cock 13 is fixed and attached. On the downstream side, the check equipment as the second equipment is installed. Valve 14 is fixedly mounted as shown. These may be known water taps or check valves, and will not be described in detail. A meter indicated by a two-dot chain line in the drawing and denoted by reference numeral 15 is also a conventionally known meter, and a detailed description thereof will be omitted.
[0014]
Reference numeral 16 denotes an attachment / detachment device for detachably attaching the meter 15 having the same basic configuration as that disclosed in Japanese Patent Application No. 8-119540 mentioned above. The attachment / detachment device 16 includes a rotation member 17, the rotation member 17 has a through hole communicating with the stop cock 13, and the stop cock 13 at one end 18 constituting the one end side connection portion 18 of the attachment / detachment device 16. Is attached to the upstream corresponding connecting portion 13a so as to be rotatable and immovable in the axial direction. The rotating member 17 includes a handle 19 and can be rotated by turning this part by hand. A female screw 20 is engraved on the inner circumference on the side opposite to the one end 18.
[0015]
Reference numeral 21 denotes a slide member, which is also provided with a through hole communicating with the meter 15 on the other end side in the through hole of the rotating member 17 on one end side, and one end side thereof is inserted into the through hole of the rotating member 17. . Further, the male screw 22 formed on the outer periphery of the intermediate portion in the axial direction is screwed into the female screw 20 of the rotating member 17 described above, and is restricted by the guide member 45 so that the rotating member 17 cannot be rotated. When it rotates, it moves forward and backward (left and right in the figure) according to the direction of rotation. The other end side 23 of the slide member 21 constitutes the other end side connection portion 23 of the attachment / detachment device 16 and is connected to the upstream side connection portion 15 a of the meter 15. This will be described later.
[0016]
The downstream connection portion 15 b of the meter 15 is connected to the downstream corresponding connection portion 14 a of the check valve 14. This will also be described later. In addition, the both side connection parts 15a and 15b of the meter 15 are supported by meter receiving parts 21b and 14b provided at the front ends of the slide member 21 and the check valve 14, respectively, in the lower part near the tip part. .
[0017]
The meter unit 11 is attached to and detached from the meter unit 11 by rotating the rotating member 17 in one direction and moving the slide member 21 rightward in FIG. The other end side connection portion 23 of the slide member 21 is brought into contact with the upstream side connection portion 15a of the meter 15 and pushed to the right in the figure, and the downstream side connection portion 15b of the meter 15 is connected to the downstream corresponding connection portion of the check valve 14. Press to 14a and fix. In that case, between the other end side connection part 23 of the slide member 21 and the upstream connection part 15a of the meter 15, and between the downstream connection part 15b of the meter 15 and the downstream corresponding connection part 14a of the check valve 14 Compress the union packing 27 arranged in the above, and seal these parts. Reference numeral 46 denotes a stop member that prevents the rotating member 17 from rotating backward and loosening. When the meter 15 is removed, the stopper member is loosened and the handle 19 is rotated to the opposite side.
[0018]
With reference to FIG. 3, the seal structure of the portion indicated by reference numeral B in FIG. 2, that is, the other end side connection portion 23 (of the slide member 21) of the attachment / detachment device 16 and the upstream side connection portion 15 of the meter 15. explain.
[0019]
One end of the aforementioned through hole of the slide member 21 is opened at the end 23 a of the other end side connection portion 23, and a circular recess 25 having a predetermined depth is formed around the opening 24. . When connected, the upstream connection portion 15a of the meter 15 is fitted into the recess 25 , and its end surface comes into contact with the bottom portion of the recess 25 to compress a unit packing 27 described later. The meter receiving portion 21b described above extends from the lower side of the recess 25 .
An annular cross-sectional square groove 26 is formed at the bottom of the recess 25 at a short distance from the edge of the opening 24. The depth of the groove 26 becomes shallower as it goes outward in the radial direction as shown in the figure. That is, the bottom of the groove 26 is inclined so as to approach the bottom of the recess 25 as it goes radially outward. The groove 26 is provided with a rubber union packing 27 having a normal shape, that is, a rectangular cross section having a substantially uniform thickness as a whole. The depth of the groove 26 is such that when the packing 27 is received in the groove 26 and is not compressed, one surface thereof slightly protrudes from the groove 26, and the upstream connection portion 15 a of the meter 15 is recessed 25. By being fitted and connected, the packing 27 is compressed and seals between the other end side connection part 23 and the upstream side connection part 15a. At that time, since the groove 26 is shallow on the outer side in the radial direction, the compression amount of the packing 27 is larger on the outer peripheral side than on the inner peripheral side. That is, in the present invention, rather than the union packing 27 is to uniformly compress the whole surface, only Oite locally predetermined compression margin in the outer peripheral side, that is, so as to compress an amount sufficient to seal. Therefore, the force required for compressing the entire surface is very small compared to compressing the entire surface by a predetermined amount. It has been confirmed that even with such local compression, extremely high sealing performance can be obtained if the compression allowance is appropriate. Since the packing 27 is received in the groove 26 and pressed by the end face of the upstream connection portion 15a of the meter 15, the packing storage portion is substantially sealed. That is, as shown in FIG. 3, the end surface of the upstream connection portion 15 a of the meter 15 abuts on the bottom of the recess 25 to close the right opening of the groove 26 in FIG. The end face of the annular convex portion formed between the inner periphery and the radially inner periphery of the recess 25 is located between the bottom of the recess 25 and the bottom of the groove 26 in the axial direction of the hole, Therefore, there is a gap between the end surface of the annular convex portion and the end surface of the upstream connection portion 15a of the meter 15. That is, the packing storage portion is a substantially sealed type that is completely closed except for the gap portion. Accordingly, when compressed, the meat of the packing 27 does not escape from the groove 26 and impair the sealing performance.
Note that the depth of the groove 27 is made shallower on the outer side rather than on the inner side in the radial direction, as described above, in addition to locally increasing the amount of compression at the outer position and obtaining high sealing performance there. Is also very important. That is, when the unit 11 is used, water is present inside the unit. A predetermined water pressure is applied to the tap water in order to improve the discharge from the faucet, and the water pressure is applied to the packing 27 at the connection portion between the other end side connection portion 23 and the upstream side connection portion 15a. It acts in the direction of the middle arrow P. That is, the water pressure acts to through the gap between the upstream connecting portion 15 a end face of the end face and the meter 15 parts annular projection of the aforementioned push the packing 27 toward shallow groove 26. Therefore, during use, the internal water pressure not only prevents the packing meat from escaping into the gap, but also increases the amount of compression of the packing, particularly at the outer position where the groove depth is shallow, It will act to enhance the sealing performance. Further, even when the elasticity on the outer peripheral side of the packing 27 on which a high compressive force is applied deteriorates due to a change with time, the packing 27 is pushed radially outward by the internal water pressure, and the reduced elasticity is corrected. High water-stopping property is maintained.
A similar seal is also made using a union packing at the connecting portion between the downstream connecting portion 15b of the meter 15 and the downstream corresponding connecting portion 14a of the check valve 14. That is, a groove similar to the aforementioned groove 26 is formed on the end face of the downstream corresponding connecting portion 14a. Since other configurations may be the same, detailed description is omitted.
[Brief description of the drawings]
FIG. 1 is a view showing an example of a conventional seal structure using a union packing.
FIG. 2 is a side sectional view of a meter unit according to an embodiment of the present invention.
FIG. 3 is an enlarged view of a portion indicated by reference sign B in FIG. 2;
[Explanation of symbols]
11 Meter unit 12 Base 13 Stop cock 13a Upstream connection 14 Check valve 14a Downstream connection 15 Meter 15a Upstream connection 15b Downstream connection 16 Detachment device 17 Rotating member 18 One end connection 21 Slide member 24 Opening 26 Circular groove 27 Union packing

Claims (3)

A rubber union having a substantially uniform thickness between the end surfaces of the first and second members having holes communicating with each other and opened at the end surfaces of the connection portions. In a seal structure in which a packing is disposed and the end faces of the first and second connection portions that are in contact with each other are compressed by compressing the union packing, either one of the connection portions of the first and second members In the end face, an annular cross-sectional square groove that can receive the union packing is formed around the opening, and the bottom of the groove approaches the end face of the connecting part as it goes radially outward of the opening. The end surface of the annular convex portion formed between the radially inner periphery of the groove and the inner periphery of the hole is inclined in the axial direction of the hole and the end surface of the connection portion. Located between the bottom Characterized in that the seal structure. Between the end faces of the connection portions of the first and second water supply equipment having holes communicating with each other and opened at the end faces of the connection portions, a rubber having a substantially uniform cross section between the end faces of the connection portions. In the sealing structure of the water supply equipment which arranges the union packing made and seals between the end surfaces of the first and second connecting portions which are in contact with each other by compressing the union packing, the connection of the first and second equipment An annular cross-sectional square groove capable of receiving the union packing is formed around the opening on the end surface of any one of the parts, and the bottom of the groove is directed radially outward of the opening. The end surface of the annular convex portion formed between the radially inner periphery of the groove and the inner periphery of the hole is inclined so as to approach the end surface of the connection portion, and is connected in the axial direction of the hole. End face and bottom of the groove Characterized in that positioned between the sealing structure of the water supply for equipment. A base, first and second water supply equipment, such as valves, attached to the base at both ends of the base, a meter disposed between the first and second equipment, and the meter, An attachment / detachment device disposed between one of the first and second equipments, attached to the one equipment, detachably connected by pressing the meter toward the other equipment, and fixed; The first equipment has an upstream corresponding connection connected to the upstream connection side of the meter, and the second equipment has a downstream corresponding connection connected to the downstream connection side of the meter. The attachment / detachment device corresponds to one end side connection portion connected to either the upstream corresponding connection portion or the downstream corresponding connection portion, and the one connection portion of the upstream corresponding connection portion or the downstream corresponding connection portion. The other end side connection part connected to one connection part of the meter The attachment / detachment device includes the one end side connection portion, and includes a rotating member attached to the one piece of equipment so as to be rotatable and non-movable in the axial direction, and the other end side connection portion. A slide member that is screwed and attached to the rotating member in a state where the rotating member rotates, and moves in the axial direction with respect to the rotating member when the rotating member rotates, the first and second equipments , the meter, The rotating member and the slide member communicate with each other through communication holes formed between the end surface of the other end side connection portion of the slide member and the end surface of the one connection portion of the meter, which are in contact with each other , and In addition, a rubber union packing having a substantially uniform thickness is disposed between the end surface of the connecting portion of the other piece of equipment that contacts each other and the end surface of the other connecting portion of the meter. Other In the end face of the connecting portion of the end surface and the other gear side connecting portion, around the opening of each of the communication holes, grooves of collection possible annular rectangular cross section of the union packing is formed, the bottom of the groove Is inclined so as to approach the end face of the connecting portion as it goes outward in the radial direction of the opening, and an annular convex portion formed between the radially inner circumference of the groove and the inner circumference of the hole The end face of the meter unit is located between the end face of the connecting portion and the bottom of the groove in the axial direction of the hole .

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