JP2002147626A - Three-way valve having total opening holding function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-way valve capable of switching flow of fluid into three conditions having a total opening holding function for stably holding the total opening condition. SOLUTION: In a speed reducer, a first guide body 27 is disposed inside a case 22 to be movable in an axial center direction of an output shaft 21. A second guide body 28 to operate against the first guide body 27 in the axial center direction of the output shaft 21 is provided on a carrier 26 integrally molded with the output shaft 21. An elastic body 31 to press the first guide body 27 toward the second guide body 28 is provided. Engagement claws 32 and 37 to be respectively engaged with the first guide body 27 and the second guide body 28 in the second opening condition are provided. A pair of lock parts 36 to receive the second guide body 28 in the first opening condition or the third opening condition are provided on the first guide body 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-way valve having a full-open holding function, and more particularly, to a three-way valve that simultaneously connects three flow paths.

[0002]

2. Description of the Related Art As shown in FIG. 22, a general pipe structure having a function of switching a path is a first pipe 51 shown in FIG.
And a second pipe 52 and a third pipe 53 having an axis perpendicular to the axis thereof are connected via a T-shaped joint 54, and an on-off valve is connected to the second pipe 52 and the third pipe 53. 55, 56
And the first pipe 51 is provided with an open / close valve 57.

[0003] The switching of the route is performed by opening and closing the two on-off valves 55, 5 and 5 in a state where the on-off valve 57 of the first pipeline 51 is opened.
6 is selectively opened or both on-off valves are opened. By this operation, the fluid flows in an arbitrary direction in the first pipe 51, the second pipe 52, and the third pipe 53.

[0004]

However, in the conventional structure as described above, the on-off valves 55 and 56 are interposed in the second and third pipes 52 and 53, respectively, in addition to the joint 54. Is required, the apparatus configuration is complicated, and the operation is complicated.

In the above-described configuration, a configuration using a three-way valve instead of the joint 54 is conceivable. However, most of the conventional three-way valves have one port as an input port and the remaining two ports as output ports, and select one of two output ports by opening and closing the valve. It was not possible to output from two output ports at the same time.

An object of the present invention is to provide a three-way valve capable of switching a fluid flow between three states and having a fully-open holding function capable of stably maintaining a fully-open state. .

[0007]

In order to solve the above-mentioned problems, a three-way valve having a fully open holding function according to the first aspect of the present invention is a rotary valve which rotates around the axis of a valve stem in a valve chamber of a valve box. A valve body is disposed, and a second and a third flow path facing each other in a direction orthogonal to the first flow path in the valve box and the first flow path in the valve box in the valve box.
A flow path in the valve box is formed in communication with the valve chamber, and a rotary valve body is provided with a valve body flow path having three openings opposed to the respective valve box flow paths. A first open state communicating the first valve box flow path and the second valve box flow path,
A three-way valve that sequentially switches between a second open state communicating all the flow paths in the valve box and a third open state communicating the first flow path in the valve box and the third flow path in the valve box. A speed reducer is connected to a valve stem with an output shaft, and the speed reducer has a first guide body disposed in a case so as to be movable in the axial direction of the output shaft, and the first guide body is movable in the axial direction of the output shaft. A second guide body opposing the one guide body is provided on a carrier integrally formed with the output shaft, and an elastic body for pressing the first guide body toward the second guide body is provided. Each of them is provided with an engagement claw that engages in the second open state, and the first guide body is provided with a pair of locking portions for receiving the second guide body in the first open state or the third open state.

[0008] With the above-described configuration, the first pipe is connected to the first, second, and third valve box flow paths, and the rotary valve body is rotated through the valve rod to form the first pipe. And the second
A first open state communicating the first pipe, a second open state communicating the first pipe with the second pipe and the third pipe, and a third open state communicating the first pipe with the third pipe. And the state. Therefore, the flow of fluid can be switched between three states by a single valve without using a joint or an on-off valve.

In this operation, the first engaging portion of the first guide receives the engaging claw of the second guide so that the first engaging portion engages with the first engaging portion.
The open state is maintained, and the third engaging state is maintained by receiving the engaging claw of the second guide body at the other locking portion, and the engaging claw of the first guide body and the engaging claw of the second guide body are engaged with each other. By doing so, the second open state is maintained.

When moving from the first open state to the third open state,
When moving from the third open state to the first open state, when moving from the first open state or the third open state to the second open state, when moving from the second open state to the first open state or the third open state. Sometimes, as the second guide body rotates about the axis of the output shaft, the two engaging claws overlap and move over each other, but this operation is performed when the first guide body opposes the pressing force of the elastic body. It is permissible to retract in the axial direction of the output shaft.

In the second open state in which the engaging claws of the first guide body and the second guide body are engaged with each other, the first guide body receives the pressing force of the elastic body in the axial direction of the output shaft. so,
Maintain that posture.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5, a three-way valve A
Is a welded three-way valve body 10 and a speed reducer 2 as an operating device.
0. The three-way valve body 10 includes a substantially T-shaped valve box 11, a single rotary valve element 12, and a valve rod 13 for rotating the rotary valve element 12.
At its upper end is connected to the output shaft 21 of the speed reducer 20.

The welded valve box 11 has a first valve box internal flow path 14 A connected to the first pipe 51, and second and third flow paths 14 A opposed to each other on an axis perpendicular to the axis of the first pipe 51. Tube 52,
53, second and third valve box flow paths 14B, 14C
And a valve chamber 15 communicating these three valve box flow paths 14A, 14B, and 14C.
The opening to 4B and 14C has a valve box sheet 16 respectively.
B and 16C are provided.

The rotary valve body 12 has a valve body flow formed therein.
Each of the three openings 18A, 18B, 18C of the road 17
This is three valve box flow paths 14A of the valve box 11, 14B, 14
C, the valve box side sheets 16B, 16
A valve body sheet 19 that can slide on C is provided. Rotating valve
12 is the intersection of the axes of the three openings 18A, 18B, 18C.
The valve chamber of the valve box 11 is rotatable about a central axis located on a point.
15 to 0 to 1 according to the rotation of the valve stem 13.
Rotational operation is possible over a range of 80 °.

In the three-way valve body 10 having the above configuration,
By rotating the rotary valve body 12 through the valve rod 13 in the range of 0 to 180 °, as shown in FIGS. 3A and 3B, the first valve box flow path 14A and the Flow path 1 in valve box 2
4B, and a first open state communicating with the second opening 4B, and (a) and (b) of FIG.
As shown in FIG. 5A, a second open state in which the first valve box flow path 14A communicates with the second valve box flow path 14B and the third valve box flow path 14C. , (B), the first
Can be sequentially switched to a third open state in which the valve body flow path 14A and the third valve case flow path 14C communicate with each other.

On the other hand, as shown in FIG.
The operation input shaft 23 and the output shaft 21
Are arranged coaxially, and the two shafts 21, 2
3 and a first planetary gear 24a and an internal gear 24
b, a sun gear 24c, a second planetary gear 24d, and the like.

As shown in FIG. 7 and FIG.
A pair of upper and lower first guides 27 are loosely fitted to a carrier 26 integrally formed with the output shaft 21, and the output shaft 2 is disposed between the two first guides 27.
The second opposing two first guide bodies 27 in one axial direction
A guide body 28 is arranged, and the second guide body 28 is fixed to the carrier 26 with bolts 29.

The flange 26a of the carrier 26 and the upper
Arranged between one guide body 27 and loosely fitted to output shaft 21
Between the formed flange 30 and the lower first guide body 27,
Each first guide body 27 is pressed toward the second guide body 28
A disc spring 31 is disposed as an elastic body.

As shown in FIGS. 9 to 13, the second guide body 28 is provided with engaging claws 32 projecting in the axial direction of the output shaft 21 on the upper and lower surfaces, and the engaging claws 32 are formed in an arc shape. And has inclined surfaces 32a on both sides. As shown in FIGS. 14 to 16, the first guide body 27 has a hole 33 through which the carrier 26 is inserted, and the engaging claw 32 of the second guide body 28 is fitted to the guide part 34 protruding around one side. Guide groove 35 to guide
have. The first guide body 27 is provided at each of both side ends of the guide groove 35 with the locking portion 3 for receiving the engaging claw 32 of the second guide body 28 in the first open state or the third open state.
6 is provided, and an engaging claw 37 for engaging with the engaging claw 32 of the second guide body 28 in the second open state is provided at an intermediate position of the guide groove 35, and inclined surfaces 37 a are provided on both sides of the engaging claw 37. Provided. The first guide body 27 is provided at both ends 27 of the guide portion 34.
a is received by a stopper 38 provided in the case 22 and is prevented from rotating.

The operation of the above configuration will be described below. As shown in FIGS. 1, 2, and 21, the three-way valve A includes first, second, and third valve box flow paths 14A, 14B, 1
4C, the first, second and third tubes 51, 52 and 53 respectively.
Is used in the state of piping connected by welding. In the valve operation, the operation input shaft 23 is rotationally driven by human power or mechanical power, and the rotary valve body 12 is set to 0 through the speed reducer 20 and the valve rod 13.
A predetermined three-way valve function is achieved by selectively rotating one of the three open states sequentially by rotating in the range of 180 °.

In the first open state, as shown in FIG.
The first pipe 51 connected to the valve box internal flow path 14A communicates with the second pipe 52 connected to the second valve box internal flow path 14B, and the side surface of the second guide body 28 is stopped by the stopper 38. .

In the second open state, as shown in FIG.
Pipe 51 communicates with the second pipe 52 and the third pipe 53,
The engaging claw 32 of the second guide body 28 and the engaging claw 37 of the first guide body 27 are engaged, and the pressing force of the disc spring 31 prevents the rotary valve body 12 from unexpectedly moving due to vibration or the like.

In the third open state, as shown in FIG.
The second guide body 28 communicates with the first pipe 51 and the third pipe 53.
Is stopped with a stopper 38. This allows
100% flow path opening in any of the two open states
Indeed it can be secured. In this operation, reducer 2
At 0, the rotation of the output shaft 21 and the carrier 26
The engaging claw 32 of the second guide body 28 is
The first guide body 27 moves in the
The engaging claw 32 of the second guide body 28 is received by the locking portion 36
In this way, the first open state is maintained, and the other
The third open state is obtained by receiving the engaging claw 32 of the guide body 28.
The first guide body 27 and the second guide body 28
The second open state is maintained by the engagement claws 32 of
I do.

When moving from the first open state to the third open state,
When moving from the third open state to the first open state, when moving from the first open state or the third open state to the second open state, when moving from the second open state to the first open state or the third open state. Sometimes, as the second guide body 28 rotates about the axis of the output shaft 21, the two engaging claws 32 and 37 overlap and move over each other, but this operation is performed by the first guide body 27.
Is retracted in the axial direction of the output shaft 21 against the pressing force of the disc spring 31.

As shown in FIGS. 17 and 18, the engagement of the two engaging claws 32, 37 is performed by the respective inclined surfaces 32a, 37.
By sliding in a, it operates smoothly. In the second open state in which the engaging claws 32 and 37 of the first guide body 27 and the second guide body 28 are mutually engaged, the first guide body 27 applies the pressing force of the disc spring 31 to the shaft of the output shaft 21. Maintain that posture by receiving in the direction of the heart.

As shown in FIGS. 19 and 20, by disposing two engagement claws 32 of the first guide body 27 or two engagement claws 37 of the first guide body 28, the first claw 32 in the second open state is provided. Engaging claws 32, 37 between guide body 27 and second guide body 28
Can be reliably maintained in a mutually engaged posture.

[0027]

As described above, according to the present invention, by using a single three-way valve to switch the fluid flow to three states without using a joint or a plurality of on-off valves, a predetermined three-way valve function is achieved. Can be reliably achieved, the valve operation is very easy, and the flow of the fluid can be quickly switched as compared with the conventional case in which the opening and closing of a plurality of on-off valves are combined. Also,
The fully open second open state can be reliably maintained by the engagement of the engagement pawls of the first guide body and the second guide body and the pressing force of the disc spring.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a three-way valve according to an embodiment of the present invention.

FIG. 2 is an external front view of the three-way valve.

FIGS. 3 (a) and 3 (b) show a first example of a valve element in the three-way valve.
It is a cross-sectional view of an open state and its schematic diagram.

FIGS. 4A and 4B show a second example of a valve body of the three-way valve;
It is a cross-sectional view of an open state and its schematic diagram.

FIGS. 5 (a) and 5 (b) show a third example of a valve element in the three-way valve.
It is a cross-sectional view of an open state and its schematic diagram.

FIG. 6 is a partially cutaway side view illustrating a configuration of a speed reducer in the same three-way valve.

FIG. 7 is an enlarged view showing a main part of the speed reducer.

FIG. 8 is a sectional view of the main part.

FIG. 9 is a perspective view of a carrier.

FIG. 10 is a plan view of the carrier.

FIG. 11 is a front view of the carrier.

FIG. 12 is a front view of a second guide body.

FIG. 13 is a plan view of the second guide body.

FIG. 14 is a plan view of a first guide body.

FIG. 15 is a front view of the first guide body.

FIG. 16 is a bottom view of the first guide body.

FIG. 17 is a schematic view illustrating the operation of a first guide body and a second guide body.

FIG. 18 is a schematic diagram illustrating the operation of a first guide body and a second guide body.

FIG. 19 is a schematic view showing the operation of a first guide body and a second guide body according to another embodiment of the present invention.

FIG. 20 is a schematic view showing the operation of a first guide body and a second guide body in the embodiment.

FIG. 21 is a piping diagram illustrating a use state of the three-way valve of the present invention.

FIG. 22 is a schematic piping diagram for realizing a conventional three-way valve function.

[Explanation of symbols]

 A Three-way valve A 10 Three-way valve body 11 Valve box 12 Rotating valve body 13 Valve rod 14A, 14B, 14C Flow path in valve box 15 Valve chamber 17 Flow path in valve 18A, 18B, 18C Opening 20 Reduction gear 21 Output shaft 22 Case 26 Carrier 26a Flange 27 First guide body 27a Both side ends 28 Second guide body 29 Bolt 30 Flange 31 Disc spring 32 Engagement claw 32a Inclined surface 33 Hole 34 Guide part 35 Guide groove 36 Lock part 37 Engagement claw 37a Inclined surface 38 Stopper

Claims (1)

[Claims] 1. A rotary valve element which rotates around an axis of a valve rod is disposed in a valve chamber of a valve box, and a first valve box flow path and a first valve box flow path are provided in the valve box.
The second, opposed in a direction orthogonal to the flow path in the valve box of the second,
The third valve box flow path is formed in communication with the valve chamber, and the rotary valve body is provided with a valve body flow path having three openings opposed to the respective valve box flow paths. A first open state in which the first internal flow path and the second internal flow path are communicated by rotation, a second open state in which all internal flow paths are communicated, A three-way valve that sequentially switches to a third open state in which the inner passage and the third valve box passage communicate with each other is connected to a rotary shaft reducer via an output shaft to a valve stem, and the reducer is a case. A first guide body is disposed movably in the axial direction of the output shaft, and a second guide body opposed to the first guide body in the axial direction of the output shaft is provided on a carrier integrally formed with the output shaft. An elastic body that presses the first guide body toward the second guide body is provided, and is engaged with each of the first guide body and the second guide body in the second open state. A three-way valve having a full-open holding function, wherein an engagement claw is provided, and a pair of locking portions for receiving the second guide body in the first open state or the third open state are provided on the first guide body.