JPH0810031B2 - Slide valve - Google Patents

Description

[Field of Use] The present invention relates to a slide valve, in particular, to a valve by slidably inserting a cylindrical or cylindrical stopper into a valve body and slidingly operating the stopper from the outside. The present invention relates to a so-called slide stopper that opens and closes a circuit in the body, including a gas stopper,
It can be used as various on-off valves.

[Prior Art and its Problems] As a gas plug of the type using the above-mentioned plug, one as shown in FIG. 5 is proposed. This one forms an L-shaped flow path reaching the gas outlet (12) from the gas inlet (11) in the valve body (1), and has a linear valve chamber (upstream of the gas outlet (12) ( The plug (2) is movably accommodated in the plug (13), the gap between the outer peripheral surface of the plug (2) and the inner peripheral surface of the valve chamber (13) is set to a very small value, and a sealant (lubricating oil is placed between them). Including). Then, the stopper (2) is biased toward the gas outlet (12) by a spring, and the outer peripheral portion of the gas outlet (12) is used as a hose end portion.
The shaft part (21) connected to the downstream side of the gas is exposed to the gas outlet (12) so as to correspond to the shaft body (31) of the socket (3) of the gas pipe connector attached to the gas outlet (12). is there.

In this conventional device, when the socket (3) is not attached, as shown in FIG. 5, the plug (2) is located downstream of the bending point of the flow passage in the valve body (1), and the valve is closed. The flow path in the body (1) is shut off. That is, since the stopper (2) is completely inserted into the valve chamber (13) and the entire outer peripheral surface of the stopper contacts the inner peripheral surface of the valve chamber (13) through the sealant, The flow path between the gas inlet (11) and the gas outlet (12) is blocked.

Then, when the socket (3) is connected, the shaft (21) is pushed by the shaft (31), the plug (2) moves to the upstream side, and reaches the bending point of the flow path in the valve body (1). . At this time, the inflow portion (14) of the bending point, which opens to the inner peripheral surface of the valve chamber (13), is positioned on the outer peripheral portion of the stopper (2),
As shown in FIG. 6, a communication passage is formed on the downstream side of the stopper (2) so that the flow passage in the valve body (1) is communicated. When the socket (3) is removed from this state, the stopper (2)
Since the urging force in the valve closing direction acts on the valve, the plug (2) is moved to the downstream side of the inflow section (14),
It returns to the valve closed state (FIG. 5) described above.

As described above, in the above-mentioned conventional device, the passage in the valve body (1) is opened and closed by mounting / removing the socket (3).

However, in this conventional device, depending on the accuracy of the stopper (2) and the valve chamber (13), there occurs a situation in which the flow passage is insufficiently blocked when the stopper (2) is closed. In other words,
It is difficult to finish the outer peripheral surface of the plug (2) and the inner peripheral surface of the valve chamber (13) with a reliable accuracy of the flow path cutoff, resulting in a valve closing failure. That is, in such a type of slide valve, it is necessary to finish the roundness, straightness, surface roughness, etc. of the stopper (2) and the valve chamber (13) to a predetermined state. With regard to the above, although the accuracy can be sufficiently improved, when finishing the inner peripheral surface of the valve chamber (13), for example, when finishing such as Superoll processing, a part of the inner peripheral surface of the valve chamber (13) is Since the inflow portion (14) is located, the machining pressure of the machining tool of the above-mentioned type becomes non-uniform at this portion, and the finishing accuracy becomes insufficient. In the valve closed state, the portion where the plug (2) is located is located inward of the portion where the inflow portion (14) is formed, but both of these portions have the same curved line that is continuously continuous in the axial direction. Since it is configured, even if the tip end of the working tool passes through the formation part of the inflow part (14) and reaches the opening non-formation area, the influence of the nonuniformity of the processing pressure by the work tool remains. Therefore, in the end, the finish accuracy of the inner peripheral surface of the portion where the line (2) is located in the closed state is also insufficient. As a result, the above-mentioned valve closing failure occurs.

[Technical Problem] The present invention provides a valve chamber (13) for accommodating such a “cylindrical or cylindrical wire (2) movably in the axial direction.
Is formed in the valve body (1), an inflow part (14) is formed in an upstream side wall of the valve chamber (13), and a moving range of the stopper (2) is formed from the inflow part (14) to a downstream side thereof. To the valve closing position (S) on the side, and at the valve closing position (S), the outer peripheral surface of the stopper (2) is slidable on the inner peripheral surface of the valve chamber (13) over its entire circumference. In order to improve the closing performance of the "contact type slide valve" when the valve is closed, it is a technical problem to improve the accuracy of the inner peripheral surface of the valve chamber (13).

[Technical Means] The technical means of the present invention taken to solve the above technical problem is that “the valve closing position (S) of the stopper (2) in the valve chamber (13) coincides with the surface of the stopper (2). And the cylindrical surface as the final finishing surface.
The whole area on the upstream side from the valve closing position (S) in 3) is defined as the diameter enlarged portion. "

[Operation] The above technical means of the present invention operates as follows.

The valve body (1) depends on whether the stopper (2) is located on the side of the enlarged diameter portion in the valve chamber (13) or in the valve closing position (S).
Although the internal flow path is opened and closed, when it is located at the valve closing position (S), the outer peripheral surface of the stopper (2) covers the entire circumference within the cylindrical inner peripheral surface finished to a predetermined accuracy. The contact state is maintained through the sealing agent, and the flow path blocking state is secured as in the conventional case.

Of the inner peripheral surface of the valve chamber (13), the inner peripheral surface at the valve closed position (S) has a predetermined straightness,
It is finished to have roundness and surface roughness, but since there is no cross-section changing part such as the inflow part (14) on this inner peripheral surface, the finishing tool should contact the entire circumference uniformly. Therefore, the non-uniform contact pressure does not occur.

The finishing process is not applied to the inner peripheral surface where the inflow part (14) is formed, and the finishing process is applied only to the portion where the plug (2) is accommodated in the valve closed state. Since the situation where the contact pressure of the finishing tool becomes non-uniform as described above does not occur at all, there is no influence of going through such a process. Therefore, the finishing accuracy of the inner circumference of the valve chamber (13) at the valve closed position (S) is sufficient.

Next, when the stopper (2) is moved to the enlarged diameter portion from the above state, at the valve opening position, the stopper (2) is positioned at the inlet portion (14) and the gas inlet (11) and the stopper ( A communication path is formed on the outer circumference of 2), and the valve is opened.

In this valve open state, even if dust adheres to the outer peripheral surface of the stopper (2), when the stopper (2) closes, the stopper (2) changes from the enlarged diameter portion to the cylindrical inner peripheral surface. When passing the section,
The stopper (2) moves to the valve closing position (S) in such a manner that the adhered dust is scraped off. Therefore, dust adhering to the plug (2) and the valve chamber (13) located at the valve closing position (S)
It will be difficult to enter between the inner surface of and.

[Effect] Since the present invention has the above-described configuration, it has the following unique effect. There is no factor that reduces the finishing accuracy of the inner peripheral surface at the valve closing position (S) of the valve chamber (13), and the above-mentioned accuracy is sufficiently enhanced. Therefore, the valve closing performance of the stopper (2) is sufficiently improved. Further, since the plug (2) and the valve chamber (13) slide in a state of having accurate coaxiality, galling and the like are less likely to occur, durability is improved, and the operating load is lightened.

Furthermore, since dust is unlikely to enter between the inner circumferential circle of the valve chamber (13) at the valve closed position (S) and the plug (2) at this position, valve closing failure due to dust is unlikely to occur. In other words, the valve closing performance is not impaired even when used in a dusty condition.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In the illustrated embodiment, the plug (2) is opened / closed by connecting / disconnecting the socket (3). The valve body (1) has an L-shaped flow similar to the above-mentioned conventional example. A passage is formed, and the valve chamber (13) is located upstream of the gas outlet (12). A taper portion (18) that expands upward is formed in the downstream portion of the valve chamber (13), and the open end on the downstream side serves as the gas outlet (12). An auxiliary valve (22) is connected to the downstream end of the shaft (21) provided in the stopper (2), which is the tapered portion (18).
The length from the stopper (2) to the auxiliary valve (22) and the valve chamber (13) so that the stopper (2) is located at the closed position (S) in the valve chamber (13) when it is in contact with the valve chamber (13). The length of the downstream portion from the valve closed position (S) is set to a predetermined value.

A spring (17) for applying a valve closing biasing force is interposed between the upstream bottom wall (16) of the valve chamber (13) and the upstream end of the plug (2). At the same time, a reset body (41) is provided at the end of the stopper (2), and the reset body (41) is formed downstream of the gas inlet (11) and is orthogonal to the valve chamber (13). Overflow prevention valve (4) inserted in the flow path
Against That is, the reset rod (42) is projectably retractable at the downstream end of the overflow prevention valve (4), and the reset rod (42) is attached to the reset body (41) via the actuator (43). It is a structure to contact and separate. The overflow prevention valve (4) has a known structure, and the ball valve housed therein operates in the overflow state to maintain the closed state, and then the reset rod (42) is pushed. And the ball valve is reset (returned to the open state).

The tongue piece (44) of the actuator (43) and the reset body (41) is arranged so as to be located in the inflow portion (14) provided at the bending point in the valve body (1), and the tongue piece is provided. (44)
The portion facing the tip of the actuator (43) is an inclined surface.

In this structure, when the valve-closed state shown in FIG. 1 is moved to the valve-opened state, the inclined surface of the tongue piece (44) pushes the arcuate portion at the tip of the actuator (43) and passes through the inclined piece (45).
When the reset rod (42) returns to the initial position in this state, and conversely the plug (2) returns from the valve opening position to the valve closing position, the actuator (43) tilts. It is configured such that the piece (45) passes while being pushed in, and the reset rod (42) is pushed in at this time. Therefore, when the overflow prevention valve (4) is in the operating state when the stopper (2) is in the valve opening position, the reset rod (42) during the return movement of the stopper (2) to the valve closing position. The ball valve is reset by pushing. Here, the reset rod (42) is always biased in the protruding direction, and the lower end thereof faces the valve seat port formed at the downstream end of the overflow prevention valve (4). By pushing in (42), the lower end approaches the valve seat opening and pushes the ball valve downward.

Further, the actuator (43) is made of a leaf spring, and is formed in a shape as shown in FIG. 3 and is connected to the upper end of the overflow prevention valve (4) to interact with the shape of the tongue piece (44). As a result, the reset operation described above proceeds smoothly.

Next, in this embodiment, the upstream side portion of the valve chamber (13) from the downstream side of the inflow portion (14) is a tapered surface (15), and the taper angle of the tapered surface (15) is 2 minutes to 2 minutes.
It is set to a degree. The area where the tapered surface (15) is formed becomes the diameter-enlarged portion described above. The bottom wall (16) of the valve chamber (13) is fitted with a screw plug (N) in this embodiment, and the diameter of the screw plug (N) is the same as that of the valve chamber (13). ) Is set larger than the diameter.

Therefore, the valve opening position (S) of the valve chamber (13) (in this embodiment, the portion of the valve chamber (13) located downstream of the vicinity of the end of the inflow portion (14)) is finished with a screw plug (N). ) Is not attached, the roundness, straightness, and surface accuracy are finished to a predetermined accuracy by Superoll processing from the open end of the valve chamber (13).

At the time of this finishing, the working tool does not come into contact with the part of the inflow portion (14), so that the problem of deterioration in accuracy as in the above-mentioned conventional example does not occur.

Particularly, in the case of the slide valve of this embodiment, the plug (2) is opened and closed by connecting and disconnecting the socket (3), and the spherical reset of the overflow prevention valve (4) is interlocked with the opening and closing of the valve. It can be used more conveniently because it is performed.

In the above embodiment, the taper angle of the tapered surface (15) is set to 5 minutes, and the valve chamber (1
The cylindrical inner peripheral surface of 3) is finished, and the stopper (2) and valve chamber (1
A dust test was conducted on the one whose diameter difference from the inner peripheral surface of 3) was set to 4 to 6 microns. In this dust test, 100 mesh pipe dust in the gas pipe was plugged (2) every time the number of opening and closing of the plug (2) reached a multiple of 1000 times.
The applicant's test showed that no leakage occurred even after the number of times of repeated opening and closing reached 30,000 times. From this, the durability of the slide valve of the above embodiment is highly evaluated.

In the embodiment described in detail above, the enlarged diameter portion formed in the valve chamber is the tapered surface forming portion, but it may be the enlarged diameter portion following the light slope portion as shown in FIG. Also in the case of this embodiment, the dust resistance is excellent, and the above-mentioned advantages in finish processing such as Superoll processing are secured.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a first embodiment of the present invention, FIG. 2 is an explanatory view of the valve closed state, FIG. 3 is a plan view of an actuator (43), and FIG. FIG. 5 is a cross-sectional view of the main part of another embodiment, FIG. 5 and FIG. 6 are explanatory views of a conventional example, in which (2) ... stopper (13) ... valve chamber (1) ... valve body (14) …… Inflow part (S) …… Valve closing position

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 999999999 Harman Co., Ltd. 1-52-1 Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka (71) Applicant 999999999 Tokyo Gas Co., Ltd. 1-5-20 Kaigan, Minato-ku, Tokyo (71) Applicant 999999999 Osaka Gas Co., Ltd. 4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka (71) Applicant 999999999 Toho Gas Co., Ltd. 19-18 Sakurada-cho, Atsuta-ku, Nagoya-shi, Aichi (72) Invention Toshiyuki Katayama 1 18-hana Hanami Kamitoba, Minami-ku, Kyoto-shi, Kyoto Prefecture Fujii Alloy Co., Ltd.

Claims (1)

[Claims] 1. A valve body (1) having a valve chamber (13) for accommodating a stopper (2) formed in a cylindrical shape or a cylindrical shape so as to be movable in an axial direction.
And an inflow portion (14) is formed on an upstream side wall of the valve chamber (13), and a moving region of the plug (2) is closed from the inflow portion (14) to a downstream closed position ( The slide of the type in which the outer peripheral surface of the stopper (2) is in slidable contact with the inner peripheral surface of the valve chamber (13) over the entire circumference while being set in the range up to S) at the valve closing position (S). In the valve, the valve chamber (13)
The valve closing position (S) of the stopper (2) in (1) is a cylindrical surface that coincides with the surface of the stopper (2), and this cylindrical surface is the final finishing surface, and the valve closing position (S) of the valve chamber (13) is ) A slide valve with the entire diameter on the upstream side is an enlarged diameter.