JP2006307978A - Gas plug - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent gas from leaking to the outside even if the plug 3 levitates from the plug storage part 30 when supplying grease to the sliding part 11 in a gas plug constituted by storing the plug 3 through which a gas passing hole 3a communicating with a gas flow passage 31a passes through in a plug storage part 30 communicating with the gas flow passage 31a, opened on one side of a gas plug main body 31, and provided with a cylindrical part 33 at an opend end continuously between an inner peripheral face of the plug storage part 30 and it through a sliding part 11 turnably. <P>SOLUTION: An annular space part 1 surrounded by an inner peripheral face of the plug storage part 30 and an outer peripheral face of the plug 3 is formed above a sliding part 11a on a side above the gas flow passage 31a and the gas passing hole 3a, and grease 2 is filled into the space part 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gas stopper, and more particularly, to a grease filling structure for preventing rainwater from entering a gas stopper body.

In general, as shown in FIG. 10, the gas stopper is formed with a thread accommodating portion (30) that opens upward in the drawing in the center of the gas flow path (31a) that is inserted into the gas stopper main body (31). At the same time, a truncated cone-shaped thread (3) that can be rotated by an operation handle (35) is housed in the thread accommodating part (30).
The gas passage hole (3a) passes through the thread (3), and as shown in the figure, the gas passage main body (31) and the gas channel (31a) in the fully open state, It rotates between the fully closed state rotated 90 degrees.
A cylindrical part (33) is extended above the thread accommodating part (30), and the operation handle (35) is fitted to the center of the upper surface of the thread (3) so as to prevent relative rotation. An operation shaft (32) for rotating the screw (3) is provided in a projecting manner.

When attaching the operation handle (35) to the cylindrical part (33) of the gas plug main body (31), the gap between the upper surface of the thread (3) in the gas plug main body (31) and the operation handle (35). The presser spring (4) is interposed in a compressed state. As a result, the thread (3) is accommodated in a state where it is elastically pushed into the thread accommodating part (30) by the urging force of the presser spring (4).
In particular, since the gas stopper for the gas meter is installed outdoors, it is necessary to prevent rainwater from entering the gas stopper main body (31). As such a waterproof structure, a structure disclosed in Japanese Utility Model Publication No. 63-7738 has been proposed.
In this case, a grease reservoir (10) is provided over the entire upper end of the sliding portion (11) between the thread (3) and the thread accommodating portion (30), and the grease (2) is placed in the grease reservoir (10). ) To prevent rainwater from entering the sliding part (11) between the thread (3) and the thread housing part (30). The grease (2) ensures sealing performance to the sliding portion (11) and prevents rainwater or the like from entering, so that the sliding portion (11) can be prevented from being rusted. The grease (2) is also applied to the sliding portion (1) in order to improve the sliding property of the thread (3) in the thread accommodating portion (30).
Japanese Utility Model Publication No. 63-7738 JP 61-48673 A

However, in the gas stopper having the conventional configuration, when supplying the grease to the sliding surface (11), if the thread (3) is lifted from the thread housing part (30), the grease in the grease reservoir (10) (2) floats on the upper surface of the thread (3), so that the gap formed between the thread (3) and the inner peripheral surface of the thread housing part (30) communicates outwardly, There was a problem that gas leaked to the outside.
For this reason, when supplying grease to the sliding surface of the thread (3), the gas must be shut off on the upstream side of the gas plug main body (31), and the maintenance work is troublesome.
According to the present invention, “a gas passage hole communicating with the gas flow path penetrates into a cylindrical housing portion that communicates with the gas flow path and opens to one side of the gas plug body and is connected to the cylindrical portion at the open end. In the “gas plug in which the spiral is rotatably accommodated between the inner peripheral surface of the spiral accommodating portion via the sliding portion”, the grease is supplied when the grease is supplied to the sliding surface. It is an object to prevent the gas from leaking to the outside even if the gas is floated from the thread housing portion.

(1) The solution means of the present invention taken to solve the above-mentioned problem is as follows: “Inside the sliding portion above the gas flow path and the gas passage hole, the inner circumference of the thread receiving portion An annular space portion surrounded by the surface and the outer peripheral surface of the thread was formed, and the space portion was filled with grease.
By forming an annular notch or the like that opens upward in the upper part of the inner peripheral surface of the thread accommodating part, the upper part of the outer peripheral surface of the thread, or both of them, the inner peripheral surface of the thread accommodating part and the thread An annular space portion can be formed above the sliding portion between the outer peripheral surface and the outer peripheral surface. This space is filled with grease. When supplying grease to the sliding portion, grease is replenished from above the space portion, and the thread is slightly lifted to press-fit the grease into the space portion and the sliding portion. It is only necessary to turn it back to turn. When the thread is floated from the thread accommodating part, a gap is formed between the inner peripheral surface of the thread accommodating part and the outer peripheral surface of the thread, and the space part filled with grease is formed above the gap. Since it exists, gas does not leak from the gap.

(2) A gas stopper according to a second aspect of the present invention is the gas stopper according to the first aspect, wherein “a grease reservoir formed above the space portion and continuous with the space portion and surrounded by the cylindrical portion”. The grease is filled in the space portion and further in the grease reservoir portion.
(3) As the grease reservoir portion, as in the gas stopper of the invention according to claim 3, “an annular peripheral wall is provided in the vicinity of the outer periphery of the upper surface of the spiral, and the grease reservoir portion includes the cylindrical portion and the peripheral wall. An annular recess surrounded by
The upper portion of the grease reservoir may be covered with an annular cap ”.
(4) The gas plug of the invention according to claim 4 is the gas plug according to claim 3, wherein the cap has a substantially U-shaped cross section that is provided with a peripheral wall on the outer peripheral edge and the inner peripheral edge and opens upward. The rainwater that has entered the gas plug body can be received and stored on the upper surface of the cap.

(5) The gas plug of the invention according to claim 5 is the gas plug according to claim 3, wherein “the cap is made of a buffer material” is a volume in which water that has entered the gas plug main body is frozen. The weight can be absorbed by the cushioning material.
(6) The gas plug of the invention according to claim 6 is the gas plug according to any of the above claims, wherein “the O-ring is provided in the space”, and the O-ring is also provided in the space along with the grease. It is desirable to interpose, and it is desirable to fill grease in both the upper and lower areas of the O-ring.

  According to the first aspect of the present invention, since the gas in the gas flow path does not leak to the outside from the gap formed between the spiral and the spiral accommodating portion even if the spiral is floated from the spiral accommodating portion, the sliding When supplying grease to the moving part, it is not necessary to shut off the gas on the upstream side of the gas plug body, and the grease supply operation is facilitated. Furthermore, even if an external force is applied to the gas stopper and the accuracy of the sliding portion of the gas stopper main body is adversely affected, leakage of gas to the outside can be prevented. In addition, even if an impact is applied to the gas plug and the gas plug may float from the girdle storage portion, the gas does not leak to the outside, so that a gas plug with improved safety can be provided.

According to the invention of claim 2, by filling the grease reservoir also with grease, the inner peripheral surface of the cylindrical portion and the upper surface of the thread can be rusted. For example, the grease reservoir protrudes from the center of the upper surface of the thread. In the case where the entire area around the operating shaft for rotating the threaded rod is used, even if the gas stopper is submerged due to a natural disaster or the like, the sliding section and the upper area of the thread are sufficiently waterproof.
According to the invention of claim 3, since the grease reservoir portion is within a limited range and the cap is covered above the grease reservoir portion, the dissipation of the grease filled in the grease reservoir portion is prevented. It is possible to reduce grease replenishment work.

According to the invention according to claim 4, since rain water that has entered the gas plug body can be received by the upper surface of the cap, it is possible to further improve the rust prevention effect for each component in the gas plug body, The drainage of rainwater becomes easy.
According to the invention which concerns on Claim 5, even if the rain water which penetrate | invaded in the gas stopper main body freezes, an unnecessary load does not act on a screw.
According to the invention which concerns on Claim 6, the waterproofing / rust prevention effect of a sliding part becomes more reliable.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is an overall view of a gas stopper in a fully opened state according to the first embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part thereof.
The gas plug main body (31) of this embodiment is similar to the conventional one in that the gas stopper body (30) opens upward and receives the inverted frustoconical shape (3) and the upper open end thereof. The cylinder housing part (30) communicates with the gas flow path (31a) of the gas plug body (31), and the cylinder (3) has a continuous cylindrical part (33). ) Pass through the gas passage hole (3a) so as to communicate with the gas flow path (31a).
Further, in the center of the upper surface of the thread (3), the operation handle (35) is fitted in a rectangular recess (34) provided on the back surface of the operation handle (35) to attach the operation handle (35) in a state of preventing relative rotation. The operation shaft (32) is projected, and around the operation shaft (32), the thread (3) is accommodated while being elastically pushed into the thread housing portion (30). A spring receiving annular groove (36) of the presser spring (4) is formed. A peripheral wall (37) is formed along the outer peripheral portion of the spring receiving annular groove (36).

The inner circumferential surface of the thread accommodating portion (30) and the outer circumferential surface of the thread (3) in both the upper and lower regions of the gas flow path (31a) and the gas passage hole (3a) are slidable sliding portions (11a). ) (11b), and in the upper area of the upper sliding part (11a), as shown in FIG. 2, the inner peripheral surface of the thread accommodating part (30) and the outer peripheral surface of the thread (3) An annular space portion (1) having a predetermined width is formed between the upper portion of the space portion (1) and between the inner peripheral surface of the cylindrical portion (33) and the peripheral wall (37). The annular grease reservoir (10) is configured to communicate with the space (1).
Then, the space (1) and the grease reservoir (10) are filled with grease (2).
As a result, even if rainwater enters the gas plug main body (31) from the gap between the operation handle (35) and the cylindrical portion (33) of the gas plug main body (31), Since there is a space (1) filled with grease and a grease reservoir (10) above the sliding part (11) with 30), there is a gap between the thread (3) and the thread storage part (30). Intrusion of rainwater into the sliding portion (11) can be reliably prevented.

When supplying the grease (2) to the sliding portion (11), the grease (2) is replenished from above the space portion (1), and the thread (3) is slightly floated, so that the grease (2 ) Is pressed into the space (1) and the sliding part (11), and after the press-fitting, the thread (3) is returned to the original position in the thread housing part (30) and rotated to slide the part (11). Spread the whole thing. At this time, when the thread (3) is lifted from the thread accommodating part (30), as shown in FIG. 3, a gap (between the outer peripheral surface of the thread (3) and the inner peripheral surface of the thread accommodating part (30) ( 12) will be formed, but since there is a space (1) filled with grease (2) at the upper end of the gap (12), the gas flow path (12) from the gap (12) The gas in 31a) will not leak to the outside. As a result, the grease (2) can be replenished without shutting off the gas upstream of the gas plug body (31).
Further, the grease (2) filled in the space (1) gradually flows down over time, but since the grease reservoir (10) is provided above the space (1), the above-mentioned The grease (2) is supplied from the grease reservoir (10) to the space (1) or the sliding portion (11) according to the flow amount.

  4 shows the gas stopper according to the second embodiment, in which a cylindrical peripheral wall (37) is provided in the entire outer periphery of the spring receiving annular groove (36) of the thread (3). In addition, in the thread accommodating portion (30) formed in a tapered shape whose diameter increases upward, the inner peripheral surface in the upper region than the sliding portion (11a) is the outer periphery of the peripheral wall (37). It is assumed that it is constituted by a vertical surface (13) facing the surface. Thus, in this embodiment, since the inner peripheral surface and the outer peripheral surface of the space portion (1) are both formed by vertical surfaces, when the spiral (3) is floated from the spiral accommodating portion (30), the space The inner peripheral surface and the outer peripheral surface of the portion (1) are shifted in parallel, and the width of the space portion (1) does not change. Therefore, the thread (3) can be shifted upward while the filled state of the grease (2) filled in the space (1) is maintained.

  FIG. 5 shows a gas stopper according to the third embodiment, which is above the space (1), the outer peripheral surface of the peripheral wall (37) of the thread (3), and the cylindrical portion (33). An annular grease reservoir portion (10) is formed between the inner peripheral surface and the inner peripheral surface of the grease reservoir portion, and a cap (40) made of an annular plate is covered above the grease reservoir portion (10). By covering the upper part of the grease (2) filled in the grease reservoir (10) with the cap (40), the grease (2) can be prevented from dissipating and the grease (2) is frequently replenished. There is no need to do it.

Furthermore, as shown in FIG. 6, by forming the inner and outer peripheral walls (41) and (42) on the outer peripheral edge and the inner peripheral edge of the cap (40), respectively, in an annular dish having a substantially U-shaped cross section. Rainwater or the like that has entered the gas plug body (31) can be received by the upper surface of the cap (40). Thereby, the antirust effect with respect to internal components, such as the said presser spring (4), improves. The water accumulated in the cap (40) may escape by evaporation.
FIG. 7 shows that the cap (40) is composed of a buffer material (5), and even if rainwater entering the gas plug main body (31) freezes and the volume increases, The load can be absorbed by the material (5), and the inconvenience that an unnecessary load acts on the thread (3) can be prevented.

Further, as shown in FIG. 8, the grease reservoir (10) may be configured around the entire periphery of the operation shaft (32) protruding from the center of the upper surface of the thread (3). Thus, even if the gas stopper is submerged due to a natural disaster or the like, the waterproof effect on the presser spring (4) provided on the upper surface of the sliding portion (11) and the grease (2) is sufficient.
Furthermore, as shown in FIG. 9, the structure in which the O-ring (20) is provided in the space (1) together with the grease (2) has a further waterproof / rust-proofing effect on the sliding portion (11). It will be certain.

BRIEF DESCRIPTION OF THE DRAWINGS The whole figure of the gas stopper in 1st embodiment of this invention. The principal part expanded sectional view of FIG. The principal part expanded sectional view which shows the state which shifted the spiral from the gas stopper in 1st embodiment of this invention. The principal part expanded sectional view of the gas stopper in 2nd Embodiment of this invention. The principal part expanded sectional view of the gas stopper in 3rd Embodiment of this invention. The principal part expanded sectional view which shows the modification of the gas stopper in 3rd Embodiment of this invention. The principal part expanded sectional view which shows the other modification of the gas stopper in 3rd Embodiment of this invention. The principal part expanded sectional view of the gas stopper in 4th Embodiment of this invention. The principal part expanded sectional view of the gas stopper in 5th Embodiment of this invention. The exploded perspective view of the conventional gas stopper.

Explanation of symbols

(1) ・ ・ ・ ・ ・ ・ Space
(11) ... Sliding part
(2) ・ ・ ・ ・ ・ ・ Grease
(3) ...
(3a) ・ ・ ・ ・ ・ ・ Gas passage hole
(30) ...
(31) ... Gas plug body
(31a) ・ ・ ・ ・ ・ Gas flow path
(33) ... Cylindrical part

Claims (6)

A gas passage hole that communicates with the gas flow path passes through a gas accommodating portion that communicates with the gas flow path and opens to one side of the gas plug body and has a cylindrical portion at the open end. In the gas stopper that is rotatably accommodated through the sliding portion between the inner peripheral surface of the spiral accommodating portion,
An annular space portion formed by an inner peripheral surface of the thread accommodating portion and an outer peripheral surface of the thread is formed further above the sliding portion above the gas flow path and the gas passage hole. ,
A gas stopper, wherein the space is filled with grease.   2. The gas stopper according to claim 1, wherein a grease reservoir portion is provided above the space portion so as to be continuous with the space portion and surrounded by the cylindrical portion.   3. The gas stopper according to claim 2, wherein an annular peripheral wall is provided in the vicinity of the outer peripheral edge of the upper surface of the spiral, the grease reservoir is within a range surrounded by the cylindrical portion and the peripheral wall, and the grease reservoir Is a gas stopper characterized by being covered with an annular cap.   4. The gas plug according to claim 3, wherein the cap has a substantially U-shaped cross section that is provided with a peripheral wall on each of an outer peripheral edge and an inner peripheral edge and opens upward.   The gas stopper according to claim 3, wherein the cap is made of a buffer material.   The gas plug according to any one of claims 1 to 5, wherein an O-ring is provided in the space portion.

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