JPH1078165A - Variable aperture mechanism - Google Patents

Abstract

(57) [Problem] To provide a simple structure capable of changing a pressure drop amount and a flow rate of a fluid flowing in a pipe within a certain range. A connecting tool (10) is provided with a male screw portion (13) and a hole (11) penetrating eccentrically parallel to its axis. The connection tool 20
A latching collar 23 and a hole 21 penetrating therethrough in the same eccentricity parallel to the axis thereof are provided. The connector 30 is a female screw
It is a cap nut-like member having a hook 31 and a hook 32 for latching.
A ring-shaped U-shaped groove 15 coaxial with the male screw portion 13 is formed on the right end face of the connector 10 so as to surround the openings of the holes 11 and 21 in common.
And an O-ring 17 is inserted therein. Connector 30
The hook 32 of the connector 20 against the flange 23 of the connector 20 and the female screw 31
Is screwed into the male screw portion 13 to connect the connecting members 10 and 20 and change the relative angular position around each axis of the common male screw portion 13 and the collar portion 23 so that the hole 11 is formed around the hole 21. The flow path resistance can be continuously changed from a constant value to infinity by partially shielding at a portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for changing the pressure drop amount and flow rate of a fluid flowing in a pipe within a certain range by inserting the pipe for sampling a radioactive gas in a nuclear power plant or the like, for example. The present invention relates to a variable aperture mechanism having a simple structure that can be operated.

[0002]

2. Description of the Related Art Conventionally, for example, in a pipe for sampling a radioactive gas in a nuclear power plant or the like, when it is necessary to set a pressure drop amount and a flow rate of a fluid flowing through the pipe to a predetermined value, a predetermined location of the pipe is required. A valve mechanism as a throttle mechanism is inserted in the valve, and the valve is displaced with respect to the valve seat to change the opening, or a fixed throttle set to the optimal fixed opening based on data obtained in preliminary experiments. A mechanism of inserting a mechanism was adopted.

[0003]

In the conventional throttle mechanism as described above, the structure is complicated and the cost is high when the opening is changed, and the structure is simple and cost-effective when the fixed opening is used. However, there was a drawback that when the situation changed, it was not possible to respond flexibly. The problem to be solved by the present invention is to solve the above problems of the prior art and to change the pressure drop amount and the flow rate of the fluid flowing through the pipe within a certain range. It is to provide a mechanism.

[0004]

According to the present invention, there is provided a first connector having a male screw portion provided at one end and a hole passing eccentrically parallel to the axis thereof; A second fitting having a latching collar provided and a hole eccentrically penetrating therethrough parallel to the axis thereof by the same amount as in the first fitting; provided at one end;
A coupling member having a female nut portion corresponding to the male screw portion of the first connector and a hook provided at the other end and having a hook portion corresponding to the collar portion of the second connector; The first and second connectors are connected at a closed loop portion such that the respective end faces of the male screw portion side and the flange portion side commonly surround the openings of the respective holes. This makes it possible to change the relative angular position of each of the male screw portion and the collar portion around each common axis line.

[0005] The present invention also provides a first connector having a flange provided at one end, a hole penetrating eccentrically parallel to the axis thereof, and a flange provided at one end. A second fitting having a hole passing eccentrically and eccentrically with respect to its axis by the same amount as in the first fitting; and a first connector when connected via respective flanges. Each of the second connectors is sealed at a closed loop portion so that the end faces on the flange side commonly surround the openings of the respective holes, and comes into pressure contact with each other. The relative angular position can be changed.

According to the present invention, a mark indicating the eccentric direction of a hole is provided on the outer periphery of each of the first and second connecting members, or the other end of each of the first and second connecting members is provided. It is preferable that the connection can be made with a pipe as a flow path, for example, a female screw for pipe connection is provided at the other end. Therefore, in the present invention, the hook of the connector is brought into contact with the latching collar of the second connector, and the female thread of the connector is screwed into the male thread of the second connector, or each flange is connected to each other. By combining
The first and second connecting members can be connected by pressing and contacting the end faces thereof. In addition, the first and second
Since the relative angle position of each of the connecting tools is variable around the axis of the common male screw portion and the flange portion, or the axis of the common flange portion, the relative angle is determined based on the mark attached to the outer periphery. By determining the angular position, the cross-sectional area (opening) of the flow path can be continuously changed within the range of zero from the cross-sectional area of the smaller hole, in other words, the smaller the hole resistance of the flow path. Can be continuously changed from a constant value corresponding to the cross-sectional area of infinity to infinity. Therefore, the pressure drop amount and the flow rate of the flow path can be continuously changed within a certain range, in other words, the pressure drop amount and the flow rate of the fluid flowing in the pipe can be adjusted. In addition, since the first and second connectors are sealed at the closed loop so that the pressing contact portions between the end faces commonly surround the openings of the holes, leakage of the fluid can be prevented. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As embodiments of the present invention, first and second embodiments will be described below with reference to the drawings. 1A and 1B relate to the first embodiment, in which (a) is a side sectional view at the time of connection, (b) is a top view, (c) is a front view as viewed from one connector 10, and (d) is the other. It is the front view seen from the connection tool 20 side. In FIG. 1A, the first embodiment comprises a connector 10 corresponding to the first connector in the invention, a connector 20 also corresponding to the second connector, and a connector 30. . The connecting tool 10 is a columnar member in which the right male screw portion 13 and the left hexagonal portion 14 are integrally connected, and the hole 11 ((c)) is eccentrically penetrated by e parallel to the axis of the male screw portion 13. ), And a pipe screw portion 12 on the side of the hexagonal portion 14 communicating therewith, which can be connected to the pipe 1 indicated by a dashed line.
Is provided. The connecting member 20 is a columnar member having a latching collar portion 23 on the left side, and a hole 21 eccentrically penetrating through e parallel to the axis of the collar portion 23 (see (d)).
And a pipe screw portion 22 on the right side that can be connected to the pipe 2 indicated by the alternate long and short dash line, and a flat portion 24 (see (d)) parallel to the outer circumference on the right side. The connecting member 30 is a hexagonal cap nut-shaped member, and has a female screw portion 31 on the left side and a hook portion 32 for latching on the right side. Returning, on the right end face of the connection tool 10, the openings of the holes 11 and 21 are commonly surrounded,
A circular ring-shaped U-shaped groove 15 coaxial with the male screw portion 13 is provided, into which an O-ring 17 as a static seal (packing) is inserted. In addition, as shown in FIG.
6, 26 can be provided, for example, by engraving or printing to indicate the eccentric direction of each hole 11, 21 respectively.

[0008] Therefore, in FIG.
The hooks 32 of the No. 0 are brought into contact with the locking flanges 23 of the connecting tool 20, and the female threads 31 of the connecting tool 30 are screwed into the male threads 13 of the connecting tool 10.
Can be connected by pressing and contacting the end faces thereof. The hexagonal portion 14 of the connecting device 10 and the parallel flat portion 24 of the connecting device 20 are useful when screwing the connecting device 30.
In addition, at the time of connection, each of the connecting tools 10 and 20 can change the relative angular position around each axis of the common male screw portion 13 and the collar portion 23, and therefore, each of the marks 16 and 26 ( (b)), the relative angular position is determined based on the visual observation, so that the cross-sectional area (opening) of the flow path is continuously reduced to zero from the cross-sectional area of the smaller hole (hole 11 in this case). In other words, the flow path resistance can be changed
It can be continuously changed from a constant value corresponding to the cross-sectional area of 1 to infinity. This will be described later in detail with reference to FIG. Therefore, the pressure drop amount and the flow rate of the flow path can be continuously changed within a certain range, in other words, the pressure drop amount and the flow rate of the fluid flowing in the pipe can be adjusted. In addition, since the pressing contact portions between the end faces of the respective connection tools are sealed via the O-ring 17, leakage of the fluid can be prevented.

FIGS. 2A and 2B relate to a change in the cross-sectional area of the flow channel in the first embodiment. FIG. 2A is a schematic diagram when the relative angular positions of the connectors are zero, and FIG. 2B is a schematic diagram when θ1. , (C) is θ2
And (d) is a schematic diagram at θ3. Each of the drawings is a schematic view of each of the holes 11 and 21 as viewed from the front side from the side of the connection tool 10. FIG. In FIG. 2A, the relative angular positions of the respective holes 11 and 21 of the connected connectors 10 and 20 around the axis O of the common male screw portion 13 and the collar portion 23 are zero. That is, the centers O1 and O2 of the holes 11 and 21 overlap and coincide. At this time, the cross-sectional area of the flow path is the area S0 of the hole 11 itself. Next, as shown in FIG. 2 (b), when the connector 20 is rotated about the common axis O with respect to the connector 10 and the relative angular position becomes θ1, the hole 11
Is shielded by the periphery of the hole 21 and the area is reduced only by the hatched area, and the cross-sectional area of the flow path becomes S1. Similarly, as shown in FIGS. 2 (c) and 2 (d), when the relative angle position of the connector 20 with respect to the connector 10 becomes θ2, θ3, the cross-sectional area of the flow path becomes S2, zero (completely shielded). . Since the flow path resistance increases as the cross-sectional area decreases, as the relative angular position increases from zero to θ1, θ2, θ3, the flow path resistance changes from an initial minimum value to infinity.

FIGS. 3A and 3B relate to the second embodiment, in which FIG. 3A is a sectional side view at the time of connection, FIG. 3B is a top view, and FIG. 3C is a front view as viewed from one connecting member side. The difference between the second embodiment and the first embodiment lies in the connection method of each connection tool. The second embodiment is a flange connection method, while the first embodiment is a screw-in method. In FIG. 3A, the connector 40 corresponding to the first connector in the invention has a flange 43 at the right end, and the connector 50 corresponding to the second connector also has a flange 53 at the left end, By connecting the flange portions 43 and 53 via the bolts 44, the connecting members 40 and 5 are connected.
0 can be connected. In each of the connecting tools 40 and 50,
Holes 41, 51 (see (c)) which are eccentric with respect to the common axis of the corresponding flange portions 43, 53 by e are provided, but are substantially the same as the holes 11, 21 in the first embodiment, respectively. is there. Further, each of the connecting tools 40 and 50 has a pipe thread portion 42 and 52 on an end surface opposite to the flange portion.
And marks 45 and 46 on the outer periphery.
A circular ring-shaped U-shaped groove 15 for inserting the O-ring 17 is provided on the right end face of the. Each of these parts has the same function as the first embodiment. Here, each hole 41,
In order to change the relative angular position of 52 within a certain range,
The through hole for the bolt 44 in the flange portion 43 of the connection tool 40 is an elongated hole.

[0011]

According to the present invention, there are the following excellent effects. (1) By inserting it into the flow path, the pressure drop amount and flow rate of the flow path can be continuously changed within a certain range, in other words, adjusting the pressure drop amount and flow rate of the fluid flowing in the piping Can be. In addition, since the connection between the first and second connection tools is selected from a screw-in method via a connection tool and a flange connection method, an optimum method according to the surrounding situation can be selected.

(2) The relative angular position of each of the first and second connectors can be accurately and easily determined by using the marks provided on the respective outer circumferences as marks. (3) The throttle mechanism itself has a simple structure, can be manufactured at low cost, and can be inserted into a predetermined location of the pipe at the other end of each of the first and second connection tools. Above is convenient.

[Brief description of the drawings]

1 (a) is a side sectional view at the time of connection, FIG. 1 (b) is a top view, FIG. 1 (c) is a front view as viewed from one connector side, and FIG. Is the front view from the other connector

FIG. 2 shows a change in the cross-sectional area of the flow channel in the first embodiment.
(a) is a schematic diagram when the relative angular positions of the connectors are zero, (b) is a schematic diagram when θ1, (c) is a schematic diagram when θ2, and (d) is a schematic diagram when θ3. Schematic diagram of

FIGS. 3A and 3B are side sectional views at the time of connection, FIG. 3B is a top view, and FIG. 3C is a front view as viewed from one connector side;

[Explanation of symbols]

 1, 2 Piping 10 Connector 11 Hole 12 Pipe Thread 13 Male Thread 14 Hexagon 15 Groove 16 Mark 17 O-ring 20 Connector 21 Hole 22 Pipe Thread 23 Collar 24 Flat 26 Mark 30 Connector 31 Female Thread 32 Hook 40 Connector 41 Hole 42 Pipe thread 43 Flange 44 Bolt 45 Mark 50 Connector 51 Hole 52 Pipe thread 53 Flange 55 Mark

Claims (4)

[Claims] A first connector having a male screw portion provided at one end and a hole penetrating eccentrically parallel to the axis thereof; a latching collar provided at one end; A second fitting having a hole passing eccentrically and eccentrically parallel to the axis thereof by the same amount as in the first fitting;
A cap nut-shaped connection having a female thread provided at one end corresponding to the male thread of the first connector and a hook provided at the other end corresponding to the collar of the second connector. And the first and second connecting tools when connected via the connecting tool, the respective end faces of the male screw portion side and the brim portion side respectively surround the opening of each hole in common. The variable aperture mechanism is characterized in that it is sealed and pressed against the closed loop portion, and the relative angular position around each common axis of the male screw portion and the collar portion can be changed. A first portion having a flange portion provided at one end and a hole penetrating eccentrically parallel to an axis thereof;
A second connector having a flange portion provided at one end and a hole penetrating eccentrically parallel to the axis thereof by the same amount as in the first connector; The first and second connectors when connected via the respective flanges are sealed at a closed loop so that the end faces of the respective flanges commonly surround the openings of the respective holes. A variable aperture mechanism, which is capable of changing the relative angular position around a common axis of each of the flange portions while being in pressure contact. 3. The mechanism according to claim 1, wherein
A variable aperture mechanism, wherein each of the first and second connection tools is provided with a mark indicating an eccentric direction of a hole on an outer periphery thereof. 4. The mechanism according to claim 1, wherein each of the first and second connectors is connectable to a pipe serving as a flow path at the other end thereof. And a variable aperture mechanism.