JPH08145295A - Force feeding device for liquid - Google Patents

Abstract

PURPOSE: To reduce displacement resistance of a shaft and change over a selector valve smoothly and surely by supporting a valve stem operating bar on a shaft of a sub-arm rotatably supported on a float arm, and moving the shaft while rotating it. 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 rotatable around a first shaft 37 supported by a closed vessel 2. A third shaft 59 is supported on a valve stem operating bar 28 connected to the selector valve 4, and a sub-arm 52 extended in the oblique direction to the perpendicular direction to an axis of the operating bar 28 is pivoted by the shaft 59. Between a fourth shaft 60 on the sub-arm 52 and the second shaft 58 on the float arm 51, a compression coil spring 54 is interposed to energize the sub-arm 52 to the right. The float 3 is connected to the other end side of the float arm 51.

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 having a built-in snap mechanism using a coil spring has a configuration disclosed in, for example, Japanese Patent Laid-Open No. 6-272797.

In the liquid pumping device disclosed in the above-mentioned Japanese Patent Laid-Open No. 6-272797, the snap mechanism includes a first shaft supported in the closed container and a float door which rotates around the first shaft. -The valve shaft operating rod that performs linear motion by the guide roller that is connected to the side, and the first shaft that is supported by the float arm at a point apart from the first shaft and that is parallel to the first shaft. A second shaft, a valve shaft operating rod, and a third shaft parallel to the first shaft and mounted between the second and third shafts,
Both mounts have compression coil springs that are rotatable.

The float is connected to the float arm, and the switching valve is connected to the valve shaft operating rod. Flow
The valve shaft operating rod is snap-moved in accordance with the elevation of the valve, and the switching valve is rapidly switched by this snap movement.

[0007]

The liquid pumping device of the prior art is one in which the switching valve is relatively reliably switched by the snap movement of the valve shaft operating rod by the snap mechanism, and the liquid can be pumped relatively efficiently. However, if it is used for a long period of time, there is a problem that the start timing of the snap movement (the timing when the coil spring starts the deformation recovery) is gradually delayed and the switching valve cannot be switched reliably.

This is because the snap movement of the valve shaft operating rod occurs when the coil spring becomes vertical to the valve shaft operating rod, so that the direction in which the switching valve of the pressing force of the coil spring is switched, that is, , The component that presses the valve shaft operating rod in its axial direction is small at the start of snap movement, and the sliding resistance between the valve shaft operating rod and the guide roller wears with the use, or foreign matter becomes caught. This is because the snap movement cannot be started at the initial position when the number increases due to such factors. If the switching of the switching valve cannot be performed reliably, the liquid cannot be pumped efficiently.

The present invention focuses on the above-mentioned problems of the prior art, and an object of the present invention is to provide a liquid pumping device capable of starting snap movement at an initial position for a long period of time.

[0010]

The technical features of the present invention are as follows:
A sealed container having a working fluid inlet, a working fluid outlet, a pressure-feeding liquid inlet, and a pressure-feeding liquid outlet has a float, a switching valve, and a snap mechanism built-in. A first axis, a floating arm rotating about the first axis, and a parallel to the first axis supported by the floating arm at a point distant from the first axis. A second shaft, a valve shaft operating rod that linearly moves by a laterally connected guide roller, a third shaft supported by the valve shaft operating rod and parallel to the first shaft, and A sub arm extending in a direction inclined from a direction perpendicular to the axis of the valve shaft operating rod and rotating around the third axis, and a sub arm supported at a point distant from the third axis. Is attached between the fourth axis parallel to the first axis and the second and fourth axes. Has a compression coil spring mounting portion is rotatable, the flow - DOO said flow - Tor - is connected to arm, the switching valve is in a liquid pumping device coupled to the valve shaft actuating 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 arm rotates, the second shaft approaches the axis of the sub arm, and the coil spring is compressed and deformed. Then, when the float further rises, the second axis is aligned with the axis of the sub arm, and when the float still rises and the second axis crosses the axis of the sub arm, the coil spring becomes The deformation is rapidly recovered, and the auxiliary arm and the valve shaft operating rod are snap-moved. As a result, the switching valve connected to the valve shaft operating rod is rapidly switched.

In the snap mechanism adopted in the liquid pumping device of the present invention, since the sub arm extends in the direction inclined from the direction perpendicular to the axis of the valve shaft operating rod, the coil spring has the sub arm. When it is lined up in a straight line with respect to
Snap movement of the valve stem operating rod occurs. Therefore, the component that axially presses the valve shaft operating rod of the coil spring at the time of starting the snap movement can be increased. 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, the bracket 38 is also composed of two "L" -shaped plates, and has the first shaft 37 and the four roller shafts 6 described above.
1 to 64 are bridged and connected. Guide rollers 65 are attached to the outer circumferences of the roller shafts 61 to 64 so as to be idle. The side surface of the valve shaft operating rod 28 is held by the guide roller 48, and the valve shaft operating rod 28 is movable only in the vertical direction.

The snap mechanism 5 includes a floating arm 51,
The sub arm 52, the compressed coil spring 54, the spring receiving member 55, the spring receiving member 56, and the valve shaft operating rod 28 are included. Float arm 51 is parallel to two
A groove 57 is provided at the left end of each of the two plates. The float arm 51 is the first shaft 3 described above.
The right end portion is rotatably supported by 7. The shaft 40 of the lever 34 is fitted in the groove 57 of the float arm 51. Therefore, the front arm 51 is
Following 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 58 parallel to the first shaft 37 is bridged, and a spring receiving member 55 is rotatably supported by the second shaft 58. Has been done. Further, the valve shaft operating rod 28 has the above-mentioned first
Also, a third shaft 59 parallel to the second shafts 37 and 58 is attached, and the right side portion of the sub arm 52 is rotatably supported by the third shaft 59. The sub arm 52 is composed of two plates facing each other in parallel, and a fourth shaft 60 parallel to the above-mentioned first to third shafts 37, 58, 59 is provided on the left side of the two plates.
Have been passed over. The spring receiving member 56 is attached to the fourth shaft 60.
Is rotatably supported. And both spring receiving members 5
A coil spring 54 in a compressed state is attached between the coils 5, 56.

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 second shaft 58 approaches the axis of the sub arm 52 in association with the rotation of the float arm 51, and the coil spring 54 is compressed and deformed. Then the float 3 further rises, and the second shaft 58
Are lined up on the axis of the sub arm 52, and when the float 3 moves up and the second shaft 58 moves below the axis of the sub arm 52, the coil spring 54 rapidly recovers its deformation. Then, the sub arm 52 and the valve shaft operating rod 28 snap upward. As a result, the switching valve 4 connected to the valve shaft operating rod 28
Is rapidly switched, 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 second shaft 58 approaches the axis of the sub arm 52 in association with the rotation of the float arm 51, and the coil spring 54 is compressed and deformed. Then, the float 3 further descends, the second shaft 58 is aligned with the line 52 of the sub arm, and the float 3 still descends so that the second shaft 58 is sub arm 52.
When the coil spring 54 is rapidly deformed, the sub arm 52 and the valve shaft operating rod 28 snap downward. As a result, the switching valve 4 connected to the valve shaft operating rod 28 is rapidly switched, the air supply valve 20 is closed, and the exhaust valve 21 is opened.

[0028]

In the liquid pumping device of the present invention, the fourth shaft rotatably supported by the float arm moves while rotating on the first and second axes of the float arm. . Therefore, the fourth shaft has a small displacement resistance and can move smoothly. 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 Pressure feed liquid inlet 17 Pressure feed liquid discharge port 20 Air supply valve 21 Exhaust valve 28 Valve shaft operating rod 37 First shaft 51 Float Arm 52 Sub Arm 54 Compressed Coil Spring 58 Second Axis 59 Third Axis 60 Fourth Axis 65 Guide Roller

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 inlet, and a pressure-feeding liquid outlet, and the snap mechanism is inside the closed container. A first shaft supported on the first shaft, a float arm rotating about the first shaft, and a first shaft supported on the first shaft at a point distant from the first shaft. A second shaft parallel to the shaft of the valve shaft, a valve shaft operating rod that linearly moves by a guide roller connected laterally, and a third shaft that is supported by the valve shaft operating rod and is parallel to the first shaft. Axis, a sub-arm extending in a direction inclined from a direction perpendicular to the axis of the valve shaft operating rod and rotating around the third axis, and the sub-arm at a point distant from the third axis. A fourth axis supported by an arm and parallel to the first axis; and a second axis
And a compression coil spring mounted between the fourth shaft and rotatable in both mounting portions, the float being connected to the float arm, and the switching valve being connected to the valve shaft operating rod. A liquid pumping device characterized in that