JP4596802B2 - Pressure detection jig and pressure detection plug - Google Patents

Description

  The present invention relates to a pressure detection plug used when inspecting the gas pressure of a gas circuit.

  Generally, this type of pressure detecting plug has a plug body. A male thread portion is formed at the upstream end of the outer peripheral surface of the plug body. The plug main body is attached to the gas circuit by screwing the male screw portion into a female screw portion provided in a gas pipe or the like and tightening. A connecting portion is formed at the downstream end of the outer peripheral surface of the plug body. On the other hand, a gas passage penetrating from the upstream end face to the downstream end face is formed in the plug body. An open / close valve for opening and closing the gas passage is provided inside the gas passage. This on-off valve opens when a socket is connected to the connecting portion. As a result, the gas pressure in the gas circuit is introduced into the pressure gauge via the pressure detecting plug, the socket, and the gas pipe connected to the socket, and the gas pressure in the gas circuit is detected by the pressure gauge (Patent Document). 1). When the socket is removed from the connecting portion, the on-off valve is closed.

Japanese Patent No. 3302829

  In the conventional pressure detecting plug, the connecting portion of the plug body largely protrudes from the outer peripheral surface of a gas pipe or the like to which the pressure detecting plug is attached. For this reason, there has been a problem that the connecting portion of the plug body becomes an obstacle during work other than the pressure detection work.

In order to solve the above problems, the present invention includes a plug body in which a gas passage penetrating from an upstream end face to a downstream end face is formed, and a valve seat formed on the inner face of the gas passage. A valve body movably provided in the gas passage on the upstream side of the valve seat so as to be seated on and separated from the valve seat, and an urging force for urging the valve body to the downstream side and seating on the valve seat An on-off valve having a means, a shielding member fixed in a removable manner in the gas passage on the downstream side of the valve seat of the on-off valve, and a gas hole penetrating from the upstream end face to the downstream end face When the shield member is removed from the plug body, the upstream end is connected to the gas passage on the downstream side of the on-off valve with the connecting portion formed on the downstream end protruding to the outside from the gas hole. And a connecting member fixed detachably. When the member is fitted into the gas passage, the downstream end face of the shielding member is positioned substantially on the same plane as the downstream end face of the plug main body or on the upstream side thereof, and is located in the middle of the gas passage. The inner peripheral surface is provided with a female thread portion that is screwed and fixed when one of the upstream end of the shielding member and the upstream end of the connecting member is removed. A plurality of engaging recesses are formed on the downstream end face of the member, and the engaging recesses are arranged at equal intervals in the circumferential direction on the circumference centered on the axis of the female screw portion, and upstream of the connecting member. A plurality of engaging projections that are detachably engaged with the sub-number of engaging portions and that transmit rotation about the axis of the female screw portion of the connecting member to the shielding member. It is characterized by being formed .
In this case, the gas hole is provided so as to be movable in the longitudinal direction thereof, and when it moves downstream beyond a predetermined position, the valve body abuts on the valve body to be applied to the urging force of the urging means. It is desirable to provide a movable member that resists the valve seat .

  According to the first and second aspects of the invention having the above-described characteristic configuration, the connecting member is not attached to the plug main body at times other than the pressure detection operation, and the shielding member is screwed and fixed to the plug main body. In this state, the downstream end surface of the shielding member is located on the same plane as the downstream end surface of the plug body or on the upstream side thereof, so that the gas from the gas pipe of the plug body etc. The protruding height is lower by at least the connecting portion than the conventional pressure detecting plug in which the connecting portion is formed integrally with the plug body. Therefore, the pressure detection plug hardly disturbs the work other than the pressure detection work.

The best mode for carrying out the present invention will be described below with reference to the drawings.
1 to 5 show an embodiment of a pressure detecting plug according to the present invention. As shown in FIG. 5, the pressure detection plug 1 of this embodiment includes a pressure detection plug jig 2 and a connection member 5.

  As shown in FIG. 1, the pressure detection plug jig 2 includes a plug body 3 and a shielding member 4. The plug body 3 is made of a metal such as brass, and a tapered male screw portion 31 is formed on the outer peripheral surface of the upstream end portion (the right end portion in FIG. 1). The taper male screw portion 31 is screwed and fixed to a female screw portion (not shown) provided in a gas circuit component (not shown) such as a gas pipe, whereby the plug body 3 is attached to the gas circuit component. ing. A wrench hanging portion 32 having a hexagonal cross section is provided at the downstream end of the plug body 3. A gas passage 33 that penetrates from the upstream end surface 3 a to the downstream end surface 3 b is formed in the plug body 3. The gas passage 33 is disposed at the center of the plug body 3 so that the axis thereof coincides with the axis of the tapered male screw portion 31. Inside the gas passage 33, an opening / closing valve 6 is provided at a location slightly upstream from the center in the longitudinal direction (gas flow direction: left-right direction in FIG. 1). An internal thread portion 34 is formed at a location slightly downstream from the center of the gas passage 33. A large-diameter hole 35 having a diameter larger than that of the female screw part 34 is formed between the female screw part 34 and the downstream end surface 3b, and a downstream side is formed between the large-diameter hole part 35 and the female screw part 34. A contact surface 36 facing the end surface 3b is formed.

The on-off valve 6 has a valve seat member 61, a valve body 62 and an urging means 63. The valve seat member 61 is composed of an O-ring or other annular sealing member, and is arranged and fixed at a location slightly upstream from the central portion of the gas passage 33 so that its axis line coincides with the axis of the gas passage 33. Yes. The valve body 62 is formed in a spherical shape, and is accommodated in the gas passage 33 on the upstream side of the valve seat member 61 so as to be movable in the longitudinal direction (left-right direction in FIG. 1). The valve body 62 may be formed in a truncated cone or other shapes. The urging means 63 is made of an elastic material such as a coil spring and is disposed in the gas passage 33 on the upstream side of the valve body 62. The urging means 63 urges the valve body 62 toward the downstream side and is seated on the valve seat member 61. When the valve body 62 is seated on the valve seat member 61, the on-off valve 6 is closed. When the on-off valve 6 is closed, the space between the inner peripheral surface of the gas passage 33 and the outer peripheral surface of the valve body 62 is hermetically sealed by the valve seat member 61. Therefore, when the valve is closed, the gas flowing into the upstream end of the gas passage 33 does not flow downstream from the valve seat member 61. On the contrary, when the valve body 62 is separated from the valve seat member 61 against the urging force of the urging means 63, the on-off valve 6 is opened. When the valve is opened, the gas flowing into the upstream end of the gas passage 33 flows through the valve seat member 61 to the downstream side of the gas passage 33.
An annular portion where the valve body 62 is seated on the valve seat member 61 is a valve seat. The valve seat may be formed integrally with the plug body 3 on the inner peripheral surface of the gas passage 33.

  The shielding member 4 is made of a metal such as brass, and a male screw portion 41 is formed on the outer peripheral surface of the upstream end portion. A head portion 42 is formed concentrically with the male screw portion 41 at the downstream end portion of the shielding member 4. The male screw portion 41 passes through the large-diameter hole portion 35 of the plug body 3 and is screwed into the female screw portion 34. The shielding member 4 is detachably fixed to the plug body 3 by screwing the male screw portion 41 into the female screw portion 34 until the head portion 42 abuts against the contact surface 36. In a state where the shielding member 4 is screwed and fixed to the plug body 3, the entire head portion 42 of the shielding member 4 is fitted into the large-diameter hole 35, and the downstream end face 4 a of the shielding member 4 is downstream of the plug body 3. It is located on the same plane as the side end face 3b. The downstream end face 4 a of the shielding member 4 may be located upstream from the downstream end face 3 b of the plug body 3.

  A pair of engaging recesses 43, 43 are formed on the downstream end surface 4 a of the shielding member 4. The pair of engaging recesses 43, 43 are arranged away from each other in the radial direction of the head 42. In addition, the pair of engaging recesses 43 and 43 are disposed 180 ° apart in the circumferential direction on one circumference centered on the axis of the head 42. One or three or more engaging recesses 43 may be formed. Also in the case of forming three or more, the respective engaging recesses are separated from each other in the radial direction of the head portion 42 and spaced apart at equal intervals in the circumferential direction on one circumference centered on the axis of the head portion 42. It is desirable to arrange them. An accommodation recess 44 is formed at the center of the downstream end face 4a.

  The outer peripheral surface of the shielding member 4 and the inner peripheral surface of the gas passage 33 are hermetically sealed by a seal member S1 such as an O-ring. Moreover, even if the seal member S1 disappears due to a fire or the like, in order to prevent gas from leaking between the outer surface of the shielding member 4 and the inner peripheral surface of the gas passage 33, the contact surface 36 and the head 42 Between, a packing P made of a nonflammable material such as metal or a flame retardant material is provided,

  The connection member 5 has a male screw portion 51, an operation portion 52, and a connection portion 53 that are sequentially formed toward an upstream end portion (right end portion in FIG. 3) and a downstream end portion. The male screw part 51, the operation part 52, and the connection part 53 are formed with their axes aligned. The male screw portion 51 can be screwed into the female screw portion 34. When the male screw portion 51 is screwed into the female screw portion 34 and tightened, the operation portion 52 is fitted into the large-diameter hole portion 35 and 36 is attached to the contact surface. I hit it. Thereby, the connection member 5 is detachably fixed to the plug body 3. In this state, approximately half of the operation portion 52 on the downstream side and the entire connection portion 53 protrude outward from the plug body 3 toward the downstream side. The connecting portion 53 is formed in the shape of a plug defined by the same standard so that a socket (not shown) of a quick joint defined by Japanese Industrial Standard JIS S 2135 is detachably connected. The outer surface of the operation member 5 and the inner peripheral surface of the gas passage 33 are hermetically sealed by a seal member S2 such as an O-ring.

  Inside the connecting member 5, a gas hole 54 penetrating from the upstream end face 5 a to the downstream end face 5 b is formed. The gas hole 54 is disposed at the center of the connection member 5 so that the axis thereof coincides with the axis of the male screw portion 51, the operation portion 52, and the connection portion 53. An annular recess 55 is formed on the inner peripheral surface of the gas hole 54. The annular recess 55 is disposed at a location slightly upstream from the downstream end face 5b.

  The movable member 7 is accommodated in the gas hole 55 so as to be movable in the axial direction of the gas hole 54. The movable member 7 is provided at a sliding portion 71 slidably provided in the gas hole 54 and a central portion of the upstream end surface of the sliding portion 71, and toward the upstream side on the axis of the gas hole 54. And an extending shaft portion 72. The sliding portion 71 has at least a downstream end in sliding contact with the inner peripheral surface of the gas hole 54, and the remaining upstream portion faces the annular recess 55. A through hole 73 that penetrates from the upstream end surface to the downstream end surface is formed in the sliding portion 71. Through the through hole 73, the upstream portion and the downstream portion of the gas hole 54 are in communication with the sliding portion 71. Plural (three in this embodiment) retaining projections 74 are provided on the upper end of the outer peripheral surface of the sliding portion 71 facing the annular recess 55. The retaining protrusions 74 are arranged at substantially equal intervals in the circumferential direction. Only one retaining protrusion 74 may be formed. When the retaining protrusion 74 hits the upstream side surface of the annular recess 55, the movable member 7 is prevented from moving upstream. Thus, the movable member 7 is prevented from coming off from the gas hole 54 upstream. Similarly, when the retaining protrusion 74 hits the downstream side surface of the annular recess 55, the movement of the movable member 7 is prevented from downstream, thereby preventing the movable member 7 from slipping from the gas hole 54 to the downstream side. Has been made.

  As shown in FIG. 3, when the retaining protrusion 74 hits the downstream side surface of the annular recess 55, the upstream end of the shaft portion 72 is downstream of the valve body 62 seated on the valve seat member 61. Some distance to the side. The distance between the shaft part 72 and the valve body 62 at this time is a distance by which the movable member 7 is pushed upstream by a push shaft (not shown) provided on the socket when the socket is connected to the connection part 53. It is shorter. Therefore, when the socket is connected to the connection portion 53, the shaft portion 72 pushes the valve body 62 upstream and separates it from the valve seat member 61. As a result, the on-off valve 6 is opened, and the gas supplied to the upstream end of the gas passage 33 of the plug body 3 is supplied to the gas passage 33, the gas hole 54, the socket, and the gas pipe connected to the socket. It is introduced into a pressure gauge (not shown) via (not shown). And the gas pressure in a gas circuit is measured with a pressure gauge. When the socket is removed from the connection portion 53 after the gas pressure is measured, the valve body 62 is pushed and moved upstream by the urging means 63 until the valve body 62 is seated on the valve seat member 61. Following this, the movable member 7 is moved upstream.

  An engaging convex portion 56 is formed on the upstream end surface 5 a of the connecting member 5. The same number of engaging convex portions 56 as the engaging concave portions 43 are formed. Therefore, in this embodiment, two engaging convex portions 56 are formed. Each engagement convex portion 56 is arranged 180 degrees apart in the circumferential direction on a circumference having substantially the same diameter as the engagement concave portion 43. In addition, the engaging convex portions 56 and 56 can be inserted into and removed from the engaging concave portions 43 and 43, respectively, and the circumferential width of the engaging convex portion 56 is substantially equal to the diameter of the engaging concave portion 43. Identical settings. Therefore, the engaging convex portions 56 and 56 can be inserted into the engaging concave portions 43 and 43 in the circumferential direction (the circumferential direction in which the engaging concave portion 43 and the engaging convex portion 56 are arranged) with almost no gap. Yes, by turning the connecting member 5 with the engaging convex portions 56, 56 inserted into the engaging concave portions 43, 43, the male screw portion 41 of the shielding member 4 is tightened or loosened with respect to the female screw portion 34. Can be. As is clear from this, the connecting member 5 is also used as a kind of screwdriver for the shielding member 4.

  In addition, the outer peripheral surface of the operation part 52 formed in the circular cross section of the connection member 5 is subjected to twill knurling to prevent slipping. Therefore, the connection member 5 can rotate the connection member 5 by holding the operation portion 52 by hand, and thereby the shielding member 4 can be fastened and fixed to the female screw portion 34 of the plug body 3. Of course, you may form the operation part 52, for example in cross-sectional hexagon or octagon so that it can be rotated with a spanner. Further, the upstream end of the shaft portion 72 of the movable member 7 protrudes upstream from the upstream end surface 5 a of the connection member 5. When the shielding member 4 is rotated by the connection member 5, the shaft portion 72. The upstream side end portion is accommodated in the accommodating recess 44 with a gap. Therefore, the shaft portion 72 does not get in the way when the shielding member 4 is rotated by the connecting member 5.

  In the pressure detection plug 1 having the above-described configuration, as shown in FIG. In this state, the pressure detection plug 1 can be used in the same manner as a conventional pressure detection plug. On the other hand, when the pressure detecting plug 1 is not used, the connecting member 5 is removed from the plug body 3 and the shielding member 4 is attached to the plug body 3. In this state, since the entire shielding member 4 is accommodated in the gas passage 33 of the plug body 3, the height of the pressure detection plug 1 from the gas circuit configuration in which the pressure detection plug 1 is screwed and fixed is determined in use. It becomes lower than the height of the pressure detecting plug 1 by at least the connecting portion 53 of the connecting member 5. Therefore, the pressure detection plug 1 hardly interferes with other work.

  Moreover, according to this pressure detection plug 1, a manufacturing cost can be reduced compared with the case where the pressure detection plug 1 is comprised by the plug main body 3 and the connection member 5 (including the movable member 7). That is, since the shielding member 4 is indispensable in the pressure detecting plug 1, the manufacturing cost increases by the amount of the shielding member 4 as compared with the case where the pressure detecting plug 1 is constituted by the plug body 3 and the connecting member 5. However, when the pressure detection plug 1 is composed of the plug body 3 and the connection member 5, the connection members 5 are required for all the pressure detection plugs 1, whereas the pressure detection plug 1 using the shielding member 4. In this case, since the connecting member 5 is necessary only at the time of pressure detection, it is sufficient that the pressure detection operator possesses it. That is, it is not necessary to provide the connection member 5 in all the pressure detection plugs 1. Here, since the connecting member 5 is larger than the shielding member 4 and the movable member 7 is provided therein, the manufacturing cost is higher than that of the shielding member 4. As described above, in the pressure detecting plug 1, the shielding member 4 is essential for each pressure detecting plug 1, but the connecting member 5 having a high manufacturing cost is greatly reduced as compared with the number of manufactured pressure detecting plugs 1. Can do. Therefore, when manufacturing a large number of pressure detecting plugs 1, the total manufacturing cost can be reduced.

  Further, when the pressure detecting plug 1 is not used, the downstream end of the gas passage 33 is closed by the shielding member 4, so that a valve or the like is inserted by inserting a rod or the like from the downstream end of the gas passage 33. It is possible to prevent a mischief such as separating the valve seat member 61 from occurring. Moreover, since the shielding member 4 is rotated by engaging the engaging convex portion 56 with the engaging concave portion 43 provided on the downstream end surface thereof, the shielding member 4 is not rotated by a normal screwdriver such as a spanner or a screwdriver. It cannot be moved. Therefore, the situation where the shielding member 4 is removed by a person other than the pressure detection operator can be prevented. Further, since the engaging convex portion 56 that can be engaged with the engaging concave portion 43 is formed on the connecting member 5, it is not necessary for the pressure detection operator to carry a special tool for rotating the shielding member 4. It is sufficient to have only the connection member 5 necessary for pressure detection. Therefore, the number of tools to be possessed can be reduced.

It is sectional drawing which shows one Embodiment of this invention in the state which attached the shielding member to the plug main body. FIG. 2 is a view taken in the direction of arrow X in FIG. 1. It is sectional drawing which shows the embodiment in the state which attached the connection member to the plug main body. FIG. 4 is a view taken along arrow X of FIG. 3 with the plug body omitted. In the same embodiment, it is sectional drawing which shows the state at the time of rotating operation of a shielding member to a plug main body using a connection member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure detection plug 2 Pressure detection plug jig 3 Plug body 3a Upstream end face 3b Downstream end face 4 Shielding member 4a Downstream end face 5 Connection member 5a Upstream end face 5b Downstream end face 6 Open / close valve 7 Movable Member 33 Gas passage 34 Female thread portion 43 Engaging recess 53 Connection portion 54 Gas hole 61 Valve seat member 62 Valve body 63 Energizing means

Claims (2)

A plug body in which a gas passage penetrating from an upstream end face to a downstream end face is formed, a valve seat formed on the inner face of the gas passage, and the valve seat so as to be seated and separated from the valve seat. An opening / closing valve having a valve body movably provided in the gas passage on the upstream side, biasing means for biasing the valve body downstream and seating on the valve seat, and a valve seat of the opening / closing valve A shielding member that is detachably fixed in the gas passage on the downstream side, and a gas hole that penetrates from the upstream end surface to the downstream end surface are formed therein, and when removing the shielding member from the plug body A connecting member that is detachably fixed to the gas passage on the downstream side of the on-off valve with the upstream end thereof in a state where the connecting portion formed at the downstream end protrudes outside from the gas hole, When the shielding member is fitted in the gas passage, The end surface of the downstream side of蔽部material is is positioned substantially on the same plane or upstream side to the end face of the downstream side of the plug body,
On the inner peripheral surface of the intermediate part of the gas passage, there is a female thread part to which the other end is screwed and fixed when either the upstream end of the shielding member or the upstream end of the connecting member is removed. Provided,
A plurality of engaging recesses are formed on the downstream end face of the shielding member, and the engaging recesses are arranged at equal intervals in the circumferential direction on a circumference centered on the axis of the female screw portion. A plurality of engaging projections that are detachably engaged with the sub-number of engaging portions and transmit rotation about the axis of the female thread portion of the connecting member to the shielding member. A pressure detecting plug in which a portion is formed . The gas hole is provided so as to be movable in its longitudinal direction, and when it moves downstream beyond a predetermined position, it strikes the valve body against the urging force of the urging means. The pressure detecting plug according to claim 1, wherein a movable member is provided apart from the valve seat.

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