JPH08145294A - Force feeding device for liquid - Google Patents

Abstract

PURPOSE: To smoothly and surety change over a selector valve by displacing a shaft while rotating it by means of a sub-arm fitted between a shaft interlocking with rotation of a float arm and another shaft supported on the float arm. CONSTITUTION: In a liquid force-feeding device incorporating a float 3, a selector valve 4 and a snap mechanism 5, the snap mechanism 5 is provided with a float arm 51 and a first sub-arm 52 rotatable around a first shaft 37 supported by a closed vessel 2. A second shaft 60 movable on an axis of the float arm 51 is provided at a point on the float arm 51 and apart from the shaft 37, a third shaft 59 is provided at a point on the first sub-arm 52 and apart, from the shaft 37, and a second sub-arm 53 is provided rotatably around the third shaft 59. A fourth shaft 58 supported on the second sub-arm 53 and a fifth shaft 62 on the float arm 51 are connected by a third sub-arm 61, and the selector arm 4 is connected to the first sub-arm 52 via a valve stem operating bar 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid pumping device for pumping liquid such as water and fuel. The liquid pressure-feeding device of the present invention is particularly suitable as a device for once collecting the condensate generated in the steam piping system and sending the condensate to the boiler or the waste heat utilization device.

[0002]

2. Description of the Related Art Condensate generated by condensation in a steam piping system
It still has a considerable amount of heat, so for effective use of energy, condensed water is collected using a liquid pumping device, and this condensed water is sent to a boiler or waste heat utilization device to waste heat. Condensate recovery system that effectively uses water is widely used.

A liquid pumping device used in a condensate recovery system temporarily recovers condensate in a closed container, switches a switching valve, and introduces a high-pressure working fluid such as steam into the closed container, and operates this operation. Condensate in the closed container is forcibly discharged by the pressure of the fluid. Therefore, in order to operate the liquid pumping device with high efficiency, it is necessary to collect as much condensed water as possible in the closed container and reliably switch the switching valve.

Therefore, a liquid pumping device generally employs a snap mechanism utilizing a coil spring to ensure switching of the switching valve. A liquid pumping device incorporating a snap mechanism using a coil spring has a configuration disclosed in, for example, Japanese Patent Laid-Open No. 6-265099.

In the liquid pumping device disclosed in the above-mentioned Japanese Patent Laid-Open Publication No. 6-265099, the snap mechanism includes a first shaft supported in a closed container and a floater rotating around the first shaft. -The arm and the first sub-arm, a second axis parallel to the first axis and supported by the float arm at a point away from the first axis, and a point away from the first axis. At first
A third shaft that is supported by the sub-arm and is parallel to the first shaft, and a slider that is slidably attached to the float arm at a point apart from the first and second shafts, A fourth shaft, which is supported by the slider and is parallel to the first shaft, and a second auxiliary arm, which is mounted between the third and fourth shafts and has both mounting portions rotatable, and a spring at one end. The second shaft has a compression coil spring whose other end is connected to a slider via a receiving member.

The float is connected to the float arm, and the switching valve is connected to the first sub arm via the valve shaft operating rod.

The first sub-arm and the second sub-arm snap-moves according to the elevation of the float, and the snap-movement moves the valve shaft operating rod to rapidly switch the switching valve. .

[0008]

In the prior art liquid pumping device, the slider supporting the fourth shaft is a floating gate.
Since it is displaced while sliding around the outer periphery of the frame, the frictional force between the slider and the float arm is large. Therefore, the displacement operation is inevitably lacking in smoothness, and if used for a long period of time, there is a problem that the slider cannot slide due to being caught. If the slider cannot slide, the switching valve cannot be switched and the liquid cannot be pumped.

It is an object of the present invention to provide a liquid pressure-feeding device which operates smoothly and is capable of reliably pressure-feeding a liquid, paying attention to the above-mentioned problems of the prior art.

[0010]

The technical features of the present invention are as follows:
A float, a switching valve, and a snap mechanism are built in a closed container having a working fluid inlet, a working fluid outlet, a pressure-feeding liquid inlet, and a pressure-feeding liquid outlet. A first axis, a float arm and a first sub-arm that rotates around the first axis, and the first axis
A second axis parallel to the first axis and supported by the float arm at a point away from the first axis and a first sub-arm at a point away from the first axis. A third axis parallel to the first axis, a second sub-arm rotating about the third axis, and the second sub-arm at a point distant from the third axis. A fourth axis that is supported by the frame and is parallel to the first axis, and a point that is separated from the first and second axes by the float arm and is parallel to the first axis. A fifth shaft, and a third sub-arm mounted between the fourth and fifth shafts such that both mounting portions are rotatable,
A compression coil spring mounted between the second and fourth shafts and rotatable in both mounting portions;
In the liquid pumping device, a switch is connected to the float arm and the switching valve is connected to the first sub arm via a valve shaft operating rod.

[0011]

In the liquid pumping device of the present invention, the coil spring snaps in accordance with the movement of the float, and the switching valve is switched to pump the liquid accumulated in the closed container, similarly to the conventionally known device. That is, when the condensate collects in the closed container, the float floats, and the float arm rotates around the first axis in conjunction with the floating of the float. This front door
As the fourth shaft moves in the second axial direction in association with the rotation of the arm, it approaches the line connecting the first shaft and the third shaft, and the coil spring is compressed and deformed. And the float rises further, the 4th
When the axes of are aligned on the line connecting the first and third axes, and the float still rises and the fourth axis crosses the line connecting the first and third axes, the coil spring The deformation recovers rapidly, and the third
Axis snaps to the side opposite to the initial side with respect to the line connecting the first axis and the fourth axis. As a result, the valve shaft operating rod connected to the first sub arm moves, and the switching valve is rapidly switched.

In the snap mechanism adopted in the liquid pumping device of the present invention, the fourth shaft is rotated about the fifth shaft by the third auxiliary arm attached between the fourth shaft and the fifth shaft. While displacing. That is, since the fourth shaft does not slide on the float arm, it can be smoothly displaced. Therefore, the switching valve is reliably switched, and the liquid can be reliably pumped.

[0013]

EXAMPLES Specific examples of the present invention will be described below. FIG. 1 is a sectional view of a liquid pumping device according to a specific embodiment of the present invention. In FIG. 1, a liquid pressure-feeding device 1 of this embodiment
In the closed container 2, the float 3, the switching valve 4, and the snap mechanism 5 are arranged.

Explaining in sequence, the closed container 2 has a main body 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 is provided with four openings, specifically, a working fluid introduction port 11, a working fluid discharge port 13, a pressure-feeding liquid inflow port 16, and a pressure-feeding liquid discharge port 17.

An air supply valve 20 is attached to the inside of the working fluid inlet 11, that is, a position inside the closed container 2, and an exhaust valve 21 is attached to the inside of the working fluid outlet 13. Here, the air supply valve 20 is composed of a valve case 22, a valve body 23, and a lifting rod 24. The valve case 22 has a through hole in the axial direction, and the upper end surface of the through hole functions as a valve seat 25. In the middle portion of the valve case 22, there are provided four openings 26 that communicate the above-mentioned through hole with the outside. The valve element 23 has a hemispherical shape and is integrally attached to the tip of the elevating rod 24.

In the liquid pumping apparatus 1 of this embodiment, the air supply valve 2
The tip of the 0 valve case 22 is screwed into the working fluid inlet 11. The valve body 23 is the working fluid inlet 1
On the first side, the elevating rod 24 passes through the through hole of the valve case 22 and comes out to the closed container 2 side so as to abut the continuous plate 27. The connecting plate 27 is connected to the valve shaft operating rod 28. Further, the valve shaft operating rod 28 is connected to the snap mechanism 5.

The exhaust valve 21 is composed of a valve case 29, a valve body 30, and a lifting rod 31. The valve case 29 has a through hole in the axial direction, a valve seat 32 is inside the through hole, and a valve body 30 held and fixed to the tip of the elevating rod 31 comes into contact with the valve seat 32 from below. It opens and closes. The valve shaft operating rod 28 and the lifting rod 31 are connected by a pin 33. The supply valve 20 and the exhaust valve 21 constitute the switching valve 4, and when the supply valve 20 opens, the exhaust valve 21 closes, and when the supply valve 20 closes, the exhaust valve 21 opens.

The pressure-feeding liquid inlet 16 is located substantially in the center of the lid portion 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 36 via a lever 34 and a shaft 35, and the snap mechanism 5 is supported by a bracket 38 via a first shaft 37. The bracket 36 and the bracket 38 are joined by screws (not shown) and integrally attached to the lid portion 8 of the closed container 2. The lever 34 is made by bending a plate into a "U" shape, and two plates are opposed to each other in parallel. The float 3 is connected to the bent portion of the lever 34. A shaft 40 is attached to the other end of the lever 34.

When viewed from above, the bracket 36 is composed of two "L" -shaped plates, and the shafts 41, 42 and the shaft 35 are connected to each other. The shaft 35 also serves as the swing shaft of the float 3. Float 3 has shaft 35
It swings up and down around. The shafts 41 and 42 also serve as upper and lower limit stoppers for the float 3. On the other hand, similarly, the bracket 38 is also made up of two "L" -shaped plates, and the first shaft 37 is bridged and connected.

The snap mechanism 5 includes a floating arm 51,
First sub-arm 52, second sub-arm 53, third sub-arm 6
1, a coil spring 54 in a compressed state, a spring receiving member 55, and a spring receiving member 56. The float arm 51 is composed of two plates facing each other in parallel, and a groove 57 is provided at the left end portion of the two plates. The right end of the float arm 51 is rotatably supported by the first shaft 37 described above. The shaft 40 of the lever 34 is fitted in the groove 57 of the float arm 51. Therefore, the float arm 51 follows the ups and downs of the float 3,
It swings up and down about the first shaft 37.

On the left side of the float arm 51, a second shaft 60 parallel to the first shaft 37 is bridged, and a spring receiving member 56 is rotatably supported by the second shaft 60. Has been done. A fifth shaft 62, which is parallel to the first shaft 37, is bridged over a portion of the float arm 51 protruding upward from the center. In addition, the above-mentioned first shaft 37
The right side portion of the first sub arm 52 is rotatably supported. The first sub arm 52 is composed of two plates facing each other in parallel, and the left side of the two plates is parallel to the first, second and fifth shafts 37, 60, 62. A third shaft 59 is suspended. Also, the second sub arm 53 is attached to the third shaft 59.
The right side of is rotatably supported. The second sub arm is composed of two plates facing each other in parallel, and the left side of the two plates has the first, second, fifth and third shafts 37,
A fourth axis 58 parallel to 60, 62, 59 is spanned,
The spring receiving member 55 is rotatably supported by the fourth shaft 58. A third sub arm 61 is rotatably attached between the fourth and fifth shafts 58 and 62.
The third sub arm 61 is composed of two plates facing each other in parallel. A coil spring 54 in a compressed state is attached between the spring receiving members 55 and 56. And the first deputy
The shaft 63 is bridged over the intermediate portion of the valve 52, and the valve shaft operating rod 28
The lower ends of are connected.

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. In addition, 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.

Liquid reservoir space 1 of liquid pumping apparatus 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 air supply valve 20 in the switching valve 4 is closed and the exhaust valve 21 is opened. 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 34 rotates clockwise around the shaft 35 and the shaft 40 moves downward. The float arm 51 is interlocked with the downward movement of the shaft 40.
Rotates counterclockwise about the first shaft 37. The fourth shaft 58 moves in the direction of the second shaft 60 in association with the rotation of the float arm 51 and approaches the line connecting the first shaft 37 and the third shaft 59, and the coil spring 54 is compressed. Deform. Then, the float 3 further rises, the fourth shaft 58 is aligned on the line connecting the first shaft 37 and the third shaft 59, and the float 3 still rises so that the fourth shaft 58 moves to the fourth shaft 58. 1 shaft 37 and 3rd
When it moves below the line connecting the shaft 59, the coil spring 54 rapidly recovers its deformation, the sub arm 52 rotates clockwise, and the third shaft 59 snaps upward.
As a result, the valve shaft operating rod 28 connected to the first sub arm 52 by the shaft 63 moves upward, and the air supply valve 20 is opened and the exhaust valve 21 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 pressure-feeding liquid discharge port 17 to an external boiler or a waste heat utilization device via a check valve (not shown).

As a result of discharging the condensate, the water level in the condensate reservoir space 10 is lowered and the float 3 is lowered. Then Lever 3
4 rotates counterclockwise around the shaft 35 and the shaft 40 moves upward. The float arm 51 rotates clockwise around the first shaft 37 in conjunction with the upward movement of the shaft 40. The fourth shaft 58 moves in the direction of the second shaft 60 in association with the rotation of the float arm 51 and approaches the line connecting the first shaft 37 and the third shaft 59, and the coil spring 54 is compressed. Deform. Then, the float 3 further descends, the fourth shaft 58 is lined up on the line connecting the first shaft 37 and the third shaft 59, and the float 3 still descends to the fourth shaft 58.
Moves above the line connecting the first shaft 37 and the third shaft 59, the coil spring 54 rapidly recovers its deformation, and the sub arm 52 rotates counterclockwise to rotate the third shaft. 59 snaps downward. As a result, the valve shaft operating rod 28 connected to the first sub arm 52 by the shaft 63 moves downward, the air supply valve 20 closes, and the exhaust valve 21 opens.

[0028]

According to the liquid pumping device of the present invention, the fourth shaft is smoothly displaced while rotating about the fifth shaft by the third sub-arm mounted between the fourth shaft and the fifth shaft. can do. Therefore, the liquid pumping device of the present invention has an excellent effect that the switching valve can be switched reliably and the liquid can be pumped reliably.

[Brief description of drawings]

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

[Explanation of symbols]

 2 Airtight container 3 Float 4 Switching valve 5 Snap mechanism 11 Working fluid inlet 13 Working fluid discharge port 16 Pressurized liquid inlet 17 Pressurized liquid discharge port 20 Air supply valve 21 Exhaust valve 28 Valve shaft operating rod 37 First shaft 51 Float Arm 52 First Sub Arm 53 Second Sub Arm 54 Compressed Coil Spring 58 Fourth Axis 59 Third Axis 60 Second Axis 61 Third Auxiliary Arm 62 Fifth Axis of

Claims (1)

[Claims] 1. A float, a switching valve, and a snap mechanism are built in a closed container having a working fluid inlet, a working fluid outlet, a pressure-feeding liquid inflow port, and a pressure-feeding liquid discharge port. A first shaft supported by the first shaft, a float arm rotating around the first shaft, and a first sub arm.
And a second axis supported by the float arm at a point distant from the first axis and parallel to the first axis,
A third axis parallel to the first axis and supported by the first sub-arm at a point distant from the first axis;
A second sub-arm that rotates about the axis of, and a fourth axis that is supported by the second sub-arm at a point away from the third axis and that is parallel to the first axis. It is mounted between a fifth shaft supported by the float arm at a point distant from the first and second shafts and parallel to the first shaft, and the fourth and fifth shafts. A third auxiliary arm whose both mounting portions are rotatable, and a compression coil spring which is mounted between the second and fourth shafts so that both mounting portions are rotatable. A liquid pumping device which is connected to the float arm, and the switching valve is connected to the first sub arm via a valve shaft operating rod.