JPH07286674A - Double seat valve - Google Patents

Abstract

PURPOSE:To provide a double seat valve in which a screw part, between a connection rod and a plug can be completely sealed and a high sealing property is provided. CONSTITUTION:Inside a sealed container 2, a float 3, a snap mechanism 5, and double seated valve 6 are built in. The snap mechanism 5 consists of a lever 52, a slider 53, a coil spring 54, and spring seat members 55, 56. A switching valve 120 is connected to the upper part of the slider 53. The double seated valve 6 consists of a pair of upper and lower valve seats 87, 88, a pair of upper and lower plugs 83, 84, and connection tube 85. A conical projection part 91 is formed in the lower end of the connection tube 85, while a conical recessed part 92 is formed in the upper end of the lower plug 84.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double seat valve which opens and closes a pair of valve seats provided on one shaft by a pair of plugs moving on the shaft. This double-seat valve can operate a pair of plugs with a small driving force.

[0002]

2. Description of the Related Art A conventional double seat valve will be described with reference to FIG. The upper valve seat member 101 has the lower valve seat member 102 with the bolt 10
Bound by three. Upper and lower valve seat members 101, 10
2, a pair of upper and lower valve seats 104 and 105 are formed on one axis. A lower plug 108 having a through screw hole is screwed to a thread portion of a connecting rod 107 provided at a lower end portion of the upper plug 106, and the lower plug 1 is attached to the upper plug 106.
08 is fixed, and as a result, a pair of upper and lower plugs 10
6, 108 are formed. This pair of plugs 10
The pair of valve seats 104 and 105 are simultaneously opened and closed by the movement of the six and 108 on the one axis. Reference number 11
Reference numeral 0 is a plug operating rod attached to the upper plug 106.

[0003]

The above-mentioned conventional double-seat valve has a problem that fluid leaks through the threaded portions of the connecting rod 107 and the lower plug 108.

It is an object of the present invention to provide a double seat valve capable of completely sealing the connecting rod and the threaded portion of the plug by paying attention to the above problems of the prior art.

[0005]

The technical features of the present invention are as follows:
It has a pair of upper and lower valve seats provided on one axis and a pair of upper and lower plugs that simultaneously open and close the pair of valve seats. The pair of upper and lower plugs are provided with a connecting rod on one plug and are connected to the other plug. In a double-seat valve provided with a through-screw hole that is screwed to a rod, a connecting pipe is provided between the upper and lower plugs around the connecting rod, and a conical uneven portion is formed in the contact portion between the connecting pipe and the other plug. Is formed, and the conical convex portion can be deformed inward by the conical concave portion.

[0006]

In the double-seat valve of the present invention, the upper and lower plugs around the connecting rod provided on one plug are connected by a connecting pipe, and the contact portion between this connecting pipe and the other plug has a substantially conical shape. Since the concavo-convex portion is formed and the conical convex portion is deformed inward by the conical concave portion, the concavo-convex surface can completely seal between the connecting pipe and the other plug, and the connecting pipe or the other plug can be connected. The deformed portion of the convex portion allows complete sealing between the bars.

[0007]

EXAMPLE A specific example in which the double-seat valve of the present invention is applied to a liquid pumping device for pumping a liquid such as water or fuel will be described below. FIG. 1 is a sectional view of a liquid pumping device having a double seat valve according to a specific embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of the double-seat valve of the liquid pumping device of FIG. In FIG. 1, the liquid pressure-feeding device 1 of the present embodiment has a closed container 2, in which a float 3, a snap mechanism 5, and a double-seat valve 6 are arranged.

Explaining in sequence, the closed container 2 has a main body portion 7
The lid portion 8 is joined with a screw (not shown), and the liquid storage space 10 is formed inside. In this embodiment, the main body 7 of the closed container 2 is a simple container, and the characteristic components of this embodiment are generally provided on the lid 8 of the closed container 2. That is, the lid 8 has four openings, specifically, a working fluid introduction port 11, a working fluid discharge port 13 formed parallel to the working fluid introduction port 11 on the inner side of the drawing, and a pressure-feeding liquid inlet port 1.
6. A pressure-feeding liquid discharge port 17 is provided.

An air supply valve 20 is built in the working fluid inlet 11. Further, an exhaust valve (not shown) is built in on the back side of the air supply valve 20 and configured as a switching valve 120.

In FIG. 1, a member numbered as 24 is a steam deflection plate, and the steam injected from the air supply valve 20 is brought into direct contact with the condensate in the liquid storage space 10. It acts as a baffle to prevent this.

The pressure-feeding liquid inlet 16 is located substantially in the center of the lid 8, and the pressure-feeding liquid outlet 17 is provided at a position corresponding to the lower portion of the closed container 2.

The float 3 is supported by a bracket 32 via a float shaft 43 and a shaft 40, and the snap mechanism 5 is supported by a bracket 33.
The bracket 33 and the bracket 32 are joined by screws (not shown) and integrally attached to the lid portion 8 of the closed container 2. Shafts 38 and 39 provided on the bracket 32
Respectively also serve as upper and lower limit stoppers of the float shaft 43. The shaft 40 also serves as the swing shaft of the float 3. In the float 3, the above-mentioned shaft 40 is passed through the float shaft 43 and swings up and down about the shaft 40. A pin 45 is attached to the other end of the float shaft 43.

A shaft 46 serving as a swing fulcrum and four roller shafts 47 are stretched around the mounting bracket 33. The guide roller 4 is provided on the outer circumference of the roller shaft 47.
8 is rotatably attached.

The snap mechanism 5 comprises a lever 52, a slider 53 as a valve shaft operating rod, a coil spring 54, a spring receiving member 55, and a spring receiving member 56. One end of the lever 52 is supported by a shaft 46, and the pin 45 of the float shaft 43 is fitted to the other end. Therefore, the lever 52 follows the ups and downs of the float 3 and swings up and down about the shaft 46.

The side surface of the slider 53 is sandwiched by a plurality of guide rollers 48 attached to a roller shaft 47, and the slider 53 is movable only in the vertical direction. On the other hand, the upper end of the slider 53 has a connecting portion 3 for interlocking the switching valve 120.
It is tied to zero. A coil spring 54 is attached between the slider 53 and the lever 52 via a spring receiving member 55 and a spring receiving member 56. Spring receiving member 5
5 is pivotally supported by the pin 75 at the end of the lever 52, and the spring receiving member 56 is pivotally supported by the pin 76 at substantially the center of the slider 53. Further, as described above, the spring receiving members 55 and 56 are provided to the lever 52 and the slider 5 respectively.
The coil spring 54 is in a compressed state in a state where the coil spring 54 is connected to No. 3.

The double-seat valve 6 comprises an upper valve seat member 81, a lower valve seat member 82, an upper plug 83, a lower plug 84, and a connecting pipe 85. The lower valve seat member 82 is joined to the upper valve seat member 81 by a bolt 86, and the upper and lower valve seat members 81, 82 are formed with a pair of upper and lower valve seats 87, 88 on one axis.
A connecting rod 89 is provided at a lower end portion of the upper plug 83, a connecting pipe 85 is inserted, and a lower plug 84 having a through screw hole is screwed to a threaded portion of the connecting rod 89.

At the lower end of the connecting pipe 85, a substantially conical projection 9 is formed.
1 is formed, and a substantially conical concave portion 92 that is coupled to the convex portion 91 of the lower plug 84 is formed at the upper end of the lower plug 84. The lower plug 84 is screwed into the connecting rod 89 and the convex portion 91 of the connecting pipe 85 is deformed inward by the concave portion 92, thereby sealing between the connecting rod 89 and the connecting pipe 85. The space between the lower plug 84 and the connecting pipe 85 is sealed by the uneven portions 91 and 92. Further, the lock screw 94 is screwed into the through screw hole of the lower plug 84 to prevent loosening. As a result, a pair of upper and lower plugs 83 and 84 that can be in close contact with the pair of upper and lower valve seats 87 and 88 are formed.

A plug operating rod 95 is screwed to the upper portion of the upper plug 83, and the upper end of the plug operating rod 95 is pivotally supported by the pin 41 on the float shaft 43. As the float 3 rises, the plug operating rod 95 moves downward about the shaft 40 as a fulcrum to communicate the liquid storage space 10 with the liquid discharge port 17, and as shown in FIG. When is lowered, it shuts off. The member numbered 96 is a condensate converging plate provided in the lower valve seat member 82 and having a plurality of openings 97. The condensate flow from one side prevents movement of the other plug. It acts as a baffle to prevent being caught.

Next, the operation of the liquid pressure-feeding device 1 of the present embodiment will be described by following a series of operation procedures when steam is used as the working fluid. First, in the external pipe of the liquid pumping device 1, the working fluid introduction port 11 is connected to a high-pressure steam source, and the working fluid discharge port 13 is connected to the steam circulation pipe. Further, the pressure-feeding liquid inlet 16 is provided from the outside with the liquid storage space 1
It is connected to a load such as a steam using device via a check valve (not shown) which opens toward 0. Meanwhile, the pressure-feeding liquid discharge port 17
Is connected to a liquid pressure destination such as a boiler via a check valve (not shown) that opens outward from the liquid storage space 10.

The liquid reservoir space 1 of the liquid pumping device 1 of this embodiment
When there is no condensate in 0, the float 3 is located at the bottom as shown in FIG. At this time, the double seat valve 6 has the upper and lower plugs 8
3, 84 are in close contact with the upper and lower valve seats 87, 88. The snap mechanism 5 includes a coil spring 54 and a slider-5.
The connecting portion (pin 76) with 3 is connected to the coil spring 54 and the lever.
It is below the connecting portion (pin 75) with 52. Therefore, the coil spring 54 presses the slider 53 diagonally downward to the right by the reaction force. Therefore, the slider 53 is pressed downward by the vertically downward component of the pressing force of the coil spring 54, contacts the contact portion, and stops at a certain position. The connecting portion 30 is a slider 53.
Is drawn toward the liquid storage space 10 side by the switching valve 1
The air supply valve 20 at 20 is closed and the exhaust valve is open. When condensate is generated in the load of the steam using device or the like, the condensate flows down from the pressure-feeding liquid inlet 16 to the liquid pressure-feeding device 1 and is accumulated in the liquid reservoir space 10.

When the float 3 floats up due to the condensed water stored in the liquid storage space 10, the lever 52 slowly rotates counterclockwise about the shaft 46, and the spring receiving member 55.
Is gradually lowered, the plug operating rod 95 is also lowered, and the upper and lower plugs 83 and 84 simultaneously open the upper and lower valve seats 87 and 88. On the other hand, on the side of the spring receiving member 56, since the slider 53 is pressed to the lowermost end by the coil spring 54, the position of the spring receiving member 56 remains at the initial position and does not move.

With the movement of the lever 52, the spring receiving member 5
By the mutual sliding of 5, 56, the interval between the pins 75, 76 becomes shorter, the coil spring 54 is further compressed, and compression energy is accumulated in the coil spring 54. Further flow
When the lever 3 floats, the rocking of the lever 52 proceeds, and the opening degree of the upper and lower plugs 83 and 84 from the upper and lower valve seats 87 and 88 increases. Further, as the swing of the lever 52 progresses, the coil spring 54 becomes vertical to the slider 53. And a little bit more float 3
When the lever rises, the joint portion (pin 75) between the lever 52 and the coil spring 54 descends, and finally the joint portion (pin 75) between the lever 52 and the coil spring 54 (the joint portion between the slider 53 and the coil spring 54 ( It is below the pin 76), and the vertical relationship of both ends of the coil spring 54 is reversed. Then, the slider 53 is pressed upward by the pressing force of the coil spring 54. As a result, the slider 53 snaps upward, the connecting portion 30 connected to the slider 53 is pushed up, the air supply valve 20 is opened, and the exhaust valve is closed.

When the working fluid introducing port 11 is opened, high-pressure steam is introduced into the closed container 2 and the internal pressure rises,
The condensed water stored in the liquid storage space 10 is pushed by the vapor pressure and is discharged from the liquid discharge port 17 to an external boiler or a waste heat utilization device via a check valve (not shown). In this case, in the double-seat valve 6 of the present embodiment, the deflector plate 96 reduces the possibility that the flow of condensate from one obstructs the movement of the other plug.

As a result of discharging the condensate, the water level in the condensate storage space 10 lowers and the float 3 descends. The snap mechanism 5 and the double-seat valve 6 follow a completely opposite path, the plug operating rod 95 rises upward, the lever 52 swings counterclockwise, and the coil spring 54 and the slider 53 again move. It has a right-angled positional relationship. Then, the slider 53 snaps in the opposite direction to the above.

[0025]

The double-seat valve of the present invention has an excellent effect that the connecting rod and the threaded portion of the plug can be completely sealed and the sealing property is high.

[Brief description of drawings]

FIG. 1 is a sectional view of a liquid pumping device according to a specific embodiment of the present invention.

2 is a cross-sectional view of a double-seat valve of the liquid pumping device of FIG.

FIG. 1 is a cross-sectional view of a conventional liquid pumping device.

[Explanation of symbols]

 3 Float 5 Snap Mechanism 6 Double Seat Valve 11 Working Fluid Inlet 16 Compressed Liquid Inlet 17 Compressed Liquid Outlet 20 Air Supply Valve 52 Lever 53 Slider 54 Coil Spring 83 Upper Plug 84 Lower Plug 85 Connection Pipe 87 Upper Valve Seat 88 Lower valve seat 89 Connecting rod 91 Conical convex portion 92 Conical concave portion 94 Lock screw 95 Plug operating rod

[Procedure amendment]

[Submission date] July 16, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a sectional view of a liquid pumping device according to a specific embodiment of the present invention.

2 is a cross-sectional view of a double-seat valve of the liquid pumping device of FIG.

FIG. 3 is a sectional view of a conventional liquid pumping device.

[Explanation of Codes] 3 Float 5 Snap Mechanism 6 Double Seat Valve 11 Working Fluid Inlet 16 Pressure Liquid Delivery Inlet 17 Pressure Liquid Delivery Outlet 20 Air Supply Valve 52 Lever 53 Slider 54 Coil Spring 83 Upper Plug 84 Lower Plug 85 Connection Pipe 87 Upper Valve seat 88 Lower valve seat 89 Connecting rod 91 Conical convex portion 92 Conical concave portion 94 Lock screw 95 Plug operating rod

Claims (1)

[Claims] 1. A pair of upper and lower valve seats provided on one axis,
It has a pair of upper and lower plugs that simultaneously open and close the pair of valve seats, and the pair of upper and lower plugs has a connecting rod provided on one plug and a through screw hole screwed to the connecting rod on the other plug. In a double-seat valve, a connecting pipe is provided between the upper and lower plugs around the connecting rod, and a conical uneven portion is formed at the contact portion between the connecting pipe and the other plug. A double-seat valve characterized by being able to be deformed inward.