JP5005415B2 - Gas stopper - Google Patents

Description

  The present invention relates to a gas stopper improved so as to achieve miniaturization.

  In general, a gas stopper includes a stopper body in which a valve accommodation hole is formed, and a valve body that is accommodated in the valve accommodation hole so as to be rotatable between a closed position and an open position. An inflow hole and an outflow hole that open to the valve accommodation hole are formed inside the plug body. Gas holes are formed inside the valve body. When the valve body is rotated to the closed position, the inflow hole and the outflow hole are blocked by the valve body, and the gas stopper is closed. When the valve body is rotated to the open position, the inflow hole and the outflow hole communicate with each other through the gas hole, and the gas stopper is opened (see Patent Documents 1 and 2).

JP 2002-130504 A JP 2002-130505 A

  Recently, there is a demand for downsizing of the gas stopper. However, when the gas stopper is reduced in size, the originally small valve body must be further reduced, and the gas hole must be reduced in diameter accordingly. As a result, there is a concern that the gas flow resistance increases and a desired flow rate cannot be obtained. For this reason, there existed a problem that it was difficult to achieve size reduction of a gas stopper.

In order to solve the above problems, the present invention has a valve housing hole inside, a plug body formed with an inflow hole and an outflow hole respectively opened on the inner surface of the valve housing hole, and a gas hole penetrating the inside. The valve body inserted into the valve housing hole so as to be rotatable between a closed position and an open position, and the outer surface portion of the plug body where the outflow hole is opened are fitted to the inner peripheral surface of one end portion so as to be rotatable. A gas pipe is screwed and fixed to the outer peripheral surface of the other end, and when the valve body is positioned at the closed position, the inflow hole and the outflow hole are blocked by the valve body, When the valve body is positioned at the open position, in the gas stopper in which the inflow hole and the outflow hole communicate with each other through the gas hole, the end of the inflow hole is tapered toward the downstream side. reduced diameter portion whose diameter is reduced is formed in, on the outlet hole, a taper whose diameter increases toward the downstream side And a tapered second enlarged-diameter hole having an enlarged diameter toward the downstream side is axially aligned with the first enlarged-diameter hole. It is characterized by being formed to match .
In this case, it is desirable that the diameter-reduced hole portion and at least the upstream end portion of the gas hole are arranged so that their axes coincide with each other when the valve body is positioned at the open position.
The downstream edge of the reduced diameter hole intersects the inner peripheral surface of the valve housing hole, and the inner diameter of the downstream edge of the reduced diameter hole is equal to the inner diameter of the upstream edge of the gas hole. It is desirable to set the same.
Between the reduced diameter hole portion and the inner surface of the valve accommodating hole, a straight hole portion is formed with the axis line coincident with the axial line of the reduced diameter hole portion. The inner diameter of the straight hole portion, the reduced diameter hole It is desirable that the inner diameter of the downstream edge of the portion and the inner diameter of the upstream edge of the gas hole are set to the same size.
It is desirable that the first diameter-expanded hole portion and at least the downstream end portion of the gas hole are arranged so that their axes coincide with each other when the valve body is positioned at the open position.
The upstream edge of the first enlarged diameter hole portion intersects the inner surface of the valve accommodating hole, and the inner diameter of the upstream edge of the first enlarged diameter hole portion is the downstream side of the gas hole. It is desirable to set it equal to the inner diameter of the edge.
Between the valve accommodation hole and the first enlarged diameter hole portion , a second straight hole portion is formed in which the axis line coincides with the axial line of the first enlarged diameter hole portion. It is desirable that the inner diameter, the inner diameter of the upstream edge of the first enlarged hole portion , and the inner diameter of the downstream edge of the gas hole are set to the same size.

  According to the present invention having the above-described characteristic configuration, the flow velocity of the gas flowing in the inflow hole is increased in the diameter-reduced hole portion, and the gas having the increased flow velocity flows into the gas hole from the diameter-reduced hole portion. Therefore, even if the inner diameter of the gas hole is reduced with the miniaturization of the valve body, a predetermined flow rate can be secured as the flow rate of the gas flowing in the gas hole.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 shows a reference example developed in the process leading to the present invention. The gas plug A of this reference example has a plug body 1 and a valve body 2.

  Inside the plug body 1, a valve housing hole 11, an inflow hole 12, and an outflow hole 13 are formed. The valve accommodation hole 11, the inflow hole 12, and the outflow hole 13 are respectively disposed in the middle portion, the upstream end portion (left end portion in FIG. 1), and the downstream end portion of the stopper body 1 in the longitudinal direction.

  The valve housing hole 11 has a tapered shape, and is arranged with its axis line oriented in a direction orthogonal to the longitudinal direction of the plug body 1. An end portion on the large diameter side of the valve housing hole 11 is open to the outer surface of the plug body 1.

  The inflow hole 12 extends straight from the upstream end surface (left end surface in FIG. 1) of the plug body 1 to the inner peripheral surface (inner surface) of the valve accommodation hole 11, and its axis is orthogonal to the axis of the valve accommodation hole 11. Are arranged to be. A connecting device S to which the flexible gas pipe G is connected is incorporated at the upstream end of the inflow hole 12. Then, gas flows from the flexible gas pipe G into the inflow hole 12. Since the connection device S is a known device, its description is omitted.

  The outflow hole 13 extends straight from the downstream end surface of the plug main body 1 to the inner peripheral surface of the valve housing hole 11, and is arranged so that its axis coincides with the axis of the inflow hole 12. Therefore, the axis of the outflow hole 13 is also orthogonal to the axis of the valve accommodating hole 11. The outflow hole 13 is connected to the connection base I of the gas device through the joint 3 that is rotatably provided on the outer peripheral surface of the downstream end portion of the stopper main body 1 and that is prevented from coming off. The joint 3 is screwed and fixed to the inner peripheral surface of the connection base I. Further, without using the joint 3, a tapered female screw portion may be formed at the opening end portion outside the outflow hole 13, and the gas pipe may be directly screwed and fixed to the tapered female screw portion.

  The valve body 2 has an outer peripheral surface formed with the same taper degree as an inner peripheral surface of the valve housing hole 11 and is rotatably inserted into the valve housing hole 11. A gas hole 21 having a constant inner diameter is formed in the valve body 2. The gas hole 21 passes straight through the valve body 2 from the outer peripheral surface of one side to the outer peripheral surface of the other side, and its axis is orthogonal to the axis of the valve body 2 (the axis of the valve housing hole 11). Has been placed.

  A handle 4 disposed outside the plug body 1 is connected to the valve body 2 so as not to rotate. When the valve body 2 is rotated to the open position shown in FIG. 1 by the handle 4, the axes of the inflow hole 12, the gas hole 21, and the outflow hole 13 coincide with each other, and the inflow hole 12, the outflow hole 13, Communicates through the gas hole 21. As a result, the gas stopper A is opened. When the valve body 2 is rotated by approximately 90 ° from the open position, the inflow hole 12 and the outflow hole 13 are blocked by the valve body 2. As a result, the gas stopper A is closed.

  In the gas stopper A, in order to reduce the flow resistance of the gas flowing in the inflow hole 12, the gas hole 21 and the outflow hole 13, thereby allowing more gas to flow, The holes 13 and the gas holes 21 are arranged so that their axes coincide with each other when the valve body 2 is positioned at the open position. The inflow hole 12 and the outflow hole 13 do not coincide with the axial line of the gas hole 21 over the entire length, and only the downstream end of the inflow hole 12 and the upstream end of the outflow hole 13 are connected to the gas hole 21. You may arrange | position so that it may correspond with an axis line.

  At the downstream end of the inflow hole 12, a diameter-reduced hole portion 12 a that is tapered toward the downstream side is formed. The inner diameter, that is, the maximum inner diameter of the upstream edge of the reduced diameter hole portion 12a is set to be substantially the same as the minimum inner diameter of the flexible gas pipe G. The downstream edge of the reduced diameter hole 12 a intersects the inner peripheral surface of the valve accommodation hole 11. The inner diameter of the downstream edge of the reduced diameter hole portion 12 a, that is, the inner diameter of the reduced diameter hole portion 12 a on the inner peripheral surface of the valve accommodating hole 11 is set to be the same as the inner diameter of the gas hole 21.

  The outflow hole 13 includes an upstream small-diameter hole (second straight hole) 13 a that opens to the inner peripheral surface of the valve housing hole 11, and a large-diameter hole 13 b that opens to the downstream end face of the plug body 1. Have. The small diameter hole portion 13 a has the same inner diameter as the gas hole 21. The large diameter hole portion 13b has an inner diameter slightly larger than that of the small diameter hole portion 13a. Between the small diameter hole portion 13a and the large diameter hole portion 13b, a tapered hole portion 13c that expands from the small diameter hole portion 13a toward the large diameter hole portion 13b is formed.

  In the gas stopper A having the above configuration, when the valve body 2 is positioned at the open position, gas flows from the flexible gas pipe G into the inflow hole 12. The gas that has flowed into the inflow hole 12 passes through the gas hole 21, the outflow hole 13, and the inside of the joint 3 and is supplied from the connection base I to the gas equipment.

  Here, the gas hole 21 is set to the minimum inner diameter among the respective parts constituting the gas passage in the gas plug A. Therefore, the flow rate of the gas stopper A is limited by the gas hole 21. However, in the gas stopper A, the diameter-reduced hole portion 12a is gradually reduced in a tapered hole shape toward the downstream side, so that when the gas flows through the inside thereof, the gas flow rate gradually increases. Therefore, the gas flows inside the gas hole 21 at a high speed. Therefore, even if the diameter of the gas hole 21 is reduced with the miniaturization of the gas stopper A, a sufficiently large flow rate can be secured as the flow rate of the gas stopper A.

Next, other reference examples developed in the process leading to the present invention and embodiments of the present invention will be described. In the following reference examples and embodiments, only the configuration different from the above-described reference example will be described, and the same components as those in the above-described reference example will be denoted by the same reference numerals and description thereof will be omitted.

FIG. 2 shows another reference example developed in the process leading to the present invention. In the gas plug B of this reference example, the diameter-reduced hole portion 12a is spaced upstream from the valve accommodating hole 11, and the downstream end portion of the inflow hole 12, that is, the diameter-reduced hole portion 12a and the valve accommodating hole 11 is provided. A straight hole 12b having a constant inner diameter is formed in a portion located between the two. The straight hole portion 12b is arranged with its axis line coincided with the axis line of the reduced diameter hole portion 12a. The inner diameter of the straight hole portion 12 b is set to be the same as the inner diameter of the downstream end edge of the reduced diameter hole portion 12 a and the inner diameter of the gas hole 21. In this gas stopper B, the joint 3 is screwed and fixed to the outer periphery of the connection base 1.

  When the straight hole portion 12b is formed, a step formed between the straight hole portion 12b and the gas hole 21 based on a manufacturing error is formed between the reduced diameter hole portion 12a and the gas hole 21. It can be made smaller than the step. That is, when the diameter-reduced hole portion 12a is opened in the valve accommodating hole 11, a size corresponding to the inner diameter error and the position error between the downstream end edge of the diameter-reduced hole portion 12a and the gas hole 21. However, the inner diameter error between the reduced diameter hole portion 12a and the gas hole 21 is greatly influenced by the length and the taper degree of the reduced diameter hole portion 12a. On the other hand, when the straight portion 12b is formed, the length and taper degree of the reduced diameter hole portion 12a have no influence on the step formed between the straight hole portion 12b and the gas hole 21. Therefore, the step formed between the straight hole 12b and the gas hole 21 can be reduced, and the gas flow resistance can be further reduced. Therefore, a larger gas flow rate can be ensured.

FIG. 3 shows a first embodiment of the present invention. In the gas plug C of this embodiment, a first enlarged hole portion (expanded hole portion) 13d is formed instead of the large diameter hole portion 13b and the tapered hole portion 13c. 13 d of 1st diameter expansion holes are gradually large diameter toward the downstream. The inner diameter of the upstream edge of the first expanded hole portion 13d, that is, the minimum inner diameter of the first expanded hole portion 13d is a step formed between the small diameter hole portion 13a and the first expanded diameter hole portion 13d. In order to prevent this, the inner diameter of the small-diameter hole 13a is set to be the same. Of course, the axis of the first enlarged-diameter hole 13d is aligned with the axis of the small-diameter hole 13a.

  In addition, a second diameter-expanded hole portion 31 that increases in diameter toward the downstream side is formed in the joint 3. The second diameter-expanded hole portion 31 is arranged with its axis line coincided with the axis line of the first diameter-expanded hole portion 13d, and extends from the vicinity of the end face on the downstream side of the plug body 1 to the end face on the downstream side of the joint 3. ing. The inner diameter, that is, the minimum inner diameter of the upstream end edge of the second expanded hole portion 31 is set to be substantially the same as the inner diameter, that is, the maximum inner diameter of the downstream end edge of the first expanded hole portion 13d. On the other hand, the inner diameter, that is, the maximum inner diameter of the downstream end edge of the second diameter-expanded hole portion 31 is set to be substantially the same as the inner diameter of the connection base I. In this embodiment, the gas flowing into the outflow hole 13 from the gas hole 21 has a lower flow velocity while passing through the first and second enlarged diameter holes 13d and 31. Therefore, it is possible to prevent a turbulent flow from occurring between the joint 3 and the connection base I.

FIG. 4 shows a second embodiment of the present invention. In the gas stopper D of this embodiment, a tapered female screw portion 12 c is formed at the upstream end portion of the inflow hole 12. A gas pipe having rigidity such as an iron gas pipe is directly screwed and fixed to the taper female thread portion 12c.

FIG. 5 shows a third embodiment of the present invention. The gas stopper E of this embodiment is called an L-type gas stopper, and the axis of the inflow hole 12 is aligned with the axis of the valve housing hole 11. In addition, the downstream end of the inflow hole 12 opens on the bottom surface (inner surface) of the valve housing hole 11 and is always in communication with the gas hole 21. On the other hand, the outflow hole 13 is arranged so as to be orthogonal to the axis of the valve accommodation hole 11 as in the above two reference examples and the first and second embodiments, and is formed on the inner peripheral surface of the valve accommodation hole 11. It is open.

  The gas hole 21 includes an upstream end 21a and a downstream end 21b that are orthogonal to each other. The upstream end portion 21 a is arranged with its axis line coincident with the axis line of the valve accommodating hole 11. The inner diameter of the upstream end 21 a is set to be the same as the minimum inner diameter of the reduced diameter hole 12 a, that is, the inner diameter of the reduced diameter hole 12 a on the bottom surface of the valve housing hole 11. Of course, in this embodiment as well, a straight hole portion may be formed between the reduced diameter hole portion 12a and the bottom surface of the valve accommodating hole 11. On the other hand, the downstream end portion 21 b is arranged such that the axis line coincides with the axis line of the outflow hole 13 when the valve body 2 is rotated to the open position. The inner diameter of the downstream end 21a is set to be the same as the inner diameter of the small-diameter hole 13a.

In addition, this invention is not limited to said embodiment, In the range which does not deviate from the summary, it can change suitably.
For example, in the above embodiment, the joint 3 is a member different from the plug body 1, but the plug body may be configured by the plug body 1 and the joint 3. In that case, the inside of the joint 3 constitutes a part of the outflow hole (downstream end).

It is sectional drawing which shows the reference example developed in the process leading to this invention. It is sectional drawing which shows the other reference example developed in the process leading to this invention. It is sectional drawing which shows 1st Embodiment of this invention. It is sectional drawing which shows 2nd Embodiment of this invention. It is sectional drawing which shows 3rd Embodiment of this invention.

Explanation of symbols

A, B, C, D, E Gas plug 1 Plug body 2 Valve body 11 Valve accommodation hole 12 Inflow hole 12a Reduced diameter hole 12b Straight hole 13 Outflow hole 13a Small diameter hole (second straight hole)
21 Gas hole 21a (upstream side) end 21b (downstream side) end

Claims (7)

The valve housing hole has a plug body formed with an inflow hole and an outflow hole which are respectively opened on the inner surface of the valve housing hole, and a gas hole penetrating the inside, and the valve housing hole has a closed position and an open position The valve body inserted in a rotatable manner between the valve body and the outer surface portion of the plug body in which the outflow hole opens are rotatably fitted to the inner peripheral surface of the one end portion, and the gas pipe is screwed to the outer peripheral surface of the other end portion. When the valve body is positioned at the closed position, the inflow hole and the outflow hole are blocked by the valve body, and when the valve body is positioned at the open position, the inflow hole is provided. And a gas stopper in which the outflow hole communicates with the gas hole,
A diameter-reducing hole portion that is tapered toward the downstream side is formed at least at the downstream end portion of the inflow hole ,
The outflow hole is formed with a tapered first diameter-expanded hole that expands toward the downstream side,
A taper-shaped second diameter-expanded hole portion that expands toward the downstream side is formed on the inner peripheral surface of the other end portion of the joint so that the axis line coincides with the first diameter-expanded hole portion. Gas stopper. 2. The reduced diameter hole portion and at least an upstream end portion of the gas hole are arranged so that their axes coincide with each other when the valve body is positioned at an open position. A gas stopper as described in 1. The downstream edge of the reduced diameter hole portion intersects the inner peripheral surface of the valve housing hole, and the inner diameter of the downstream edge of the reduced diameter hole portion is the upstream edge of the gas hole. The gas stopper according to claim 2, wherein the gas stopper is set to be equal to the inner diameter of the gas stopper. Between the reduced diameter hole portion and the inner surface of the valve accommodating hole, a straight hole portion is formed with the axis line coincident with the axial line of the reduced diameter hole portion. The inner diameter of the straight hole portion, the reduced diameter hole 3. The gas plug according to claim 2, wherein the inner diameter of the downstream end edge of the portion and the inner diameter of the upstream end edge of the gas hole are set to the same size. The first diameter-expanded hole portion and at least the downstream end portion of the gas hole are arranged so that their axes coincide with each other when the valve body is positioned at the open position. Item 5. A gas stopper according to any one of Items 1 to 4. The upstream edge of the first enlarged diameter hole portion intersects the inner surface of the valve accommodating hole, and the inner diameter of the upstream edge of the first enlarged diameter hole portion is on the downstream side of the gas hole. The gas stopper according to claim 5, wherein the gas stopper is set to be the same as the inner diameter of the end edge. Between the valve accommodation hole and the first enlarged diameter hole portion , a second straight hole portion is formed in which the axis line coincides with the axial line of the first enlarged diameter hole portion. 6. The gas according to claim 5, wherein the inner diameter, the inner diameter of the upstream edge of the first enlarged hole portion , and the inner diameter of the downstream edge of the gas hole are set to the same size. plug.

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