JPH08145291A - Force feeding device for liquid - Google Patents

Abstract

PURPOSE: To provide a liquid force-feeding device with the reduced number of part items and simple structure. CONSTITUTION: A float 3, a selector valve 4, and a snap mechanism 5 are incorporated in a closed vessel 2. The snap mechanism 5 is composed of a first shaft 37 supported in the closed vessel 2, a float arm 51 and a sub-arm 52 rotating around the first shaft 37, a second shaft 58 supported by the float arm 51 at a point apart from the first shaft 37, a third shaft 59 supported by the sub-arm 52 at a point apart from the first shaft 37, and a compression coil spring 54 fitted between the second and third shafts and of which both fitting parts are rotatable. A float is connected to the float arm 51 and the selector valve 4 is connected to the third shaft 59 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 pressure-feeding device incorporating a snap mechanism using a coil spring has a configuration disclosed in US Pat. No. 5,141,405, for example.

FIG. 6 is a front view of a snap mechanism of a prior art liquid pumping device. US Pat. No. 5,141,405 mentioned above.
In the liquid pumping device disclosed in Japanese Patent No.
Is composed of a float arm 101, a sub arm 102, and a coil spring 103 in a compressed state. The float arm 101 is attached to the support member 105 by the pin 106.
It is swingably fixed by the
Is attached.

One end of the sub arm 102 is connected to the support member 105 by the same pin 106 as the float arm 101,
The other end is connected to one end of the coil spring 103 by a pin 110 via a spring receiving member 116. Sub Arm 1
A valve shaft operating rod 111 is connected to an intermediate portion of 02 by a pin 107. The valve shaft operating rod 111 is connected to a switching valve (not shown), and the snap mechanism 100 is linked to the switching valve via the valve shaft operating rod 111.

The other end of the coil spring 103 in FIG. 6 is connected to the float arm 101 by a pin 112 via a spring receiving member 115. In the liquid pumping device of the prior art, the float 108 floats when condensed water is accumulated in a closed container (not shown), and the spring receiving member 115 side of the coil spring 103 moves upward in conjunction with the floating of the float 108. Then, the coil spring 103 is compressed and deformed. Then, the float 108 further rises, the coil spring 103 and the sub arm 102 are aligned in a straight line, and the float 108 still rises so that the angle between the coil spring 103 and the sub arm 102 is 18 degrees.
When it exceeds 0 degrees, the coil spring 103 rapidly recovers its deformation, and the connecting portion (pin 110) between the coil spring 103 and the sub arm 102 snaps downward. As a result, the valve shaft operating rod 111 moves downward, and the switching valve (not shown) is rapidly switched.

[0008]

The liquid pumping device 100 of the prior art is capable of pumping liquid relatively efficiently with a simple structure, but the pin 107 is provided in the intermediate portion of the sub arm 102. Since the valve shaft operating rod 111 is connected through the pin, a pin 107 for connecting the valve shaft operating rod 111 to the sub arm 102 is required, and the number of parts is large and the structure is complicated. There was a point.

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 having a simple structure by reducing the number of parts.

[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 sub-arm that rotates around the first axis, and a first arm supported by the float arm at a point away from the first axis. A second axis parallel to the first axis, a third axis parallel to the first axis supported by the sub-arm at a point distant from the first axis, and the second and third axes. Has a compression coil spring that is mounted between the shafts of both of which is rotatable, the float is connected to the float arm, and the switching valve is connected to the first shaft via a valve shaft operating rod. 3 is a liquid pumping device connected to the shaft.

[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 condensate collects in the airtight container, the float floats, and the float arm rotates around the first axis in conjunction with the floating of the float, and the float arm moves. And the second shaft side, which is the connecting portion of the coil spring, is connected to the first shaft and the third shaft.
The coil spring is compressed and deformed by moving in a direction approaching the line connecting the axes. Then the float further rises, the second shaft is aligned on the line connecting the first shaft and the third shaft, and the float still rises so that the second shaft becomes the first shaft and the third shaft. When it goes beyond the line connecting the axes of the coil spring, the coil spring recovers its deformation rapidly, and the third shaft, which is the connecting portion between the coil spring and the sub arm, is connected to the first shaft and the second shaft.
Snap to the side opposite to the initial line with respect to the line connecting the axes. As a result, the valve shaft operating rod connected to the third shaft moves, and the switching valve is rapidly switched.

Since the snap mechanism adopted in the liquid pumping device of the present invention is such that the valve shaft operating rod is connected to the third shaft, the third shaft, which is the connecting portion between the coil spring and the sub arm, is It can also serve as the connecting portion of the valve shaft operating rod. In this way, since a shaft for connecting the valve shaft operating rod to the sub arm is not separately required, the number of parts can be reduced and a liquid pumping device having a simple structure can be manufactured.

[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,
The sub arm 52 includes a coil spring 54 in a compressed state, a spring receiving member 55, and a spring receiving member 56. The front arm 51 is composed of two plates facing each other in parallel,
A groove 57 is provided at the left end of the two plates. The right end of the float arm 51 is rotatably supported by the first shaft 37 described above. Also the front arm 51
The shaft 40 of the lever 34 described above is fitted in the groove 57. Therefore, the float arm 51 follows the ups and downs of the float 3 and 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 sub arm 5 is attached to the above-mentioned first shaft 37.
The right side of 2 is rotatably supported. Sub Arm 52
Is a pair of plates facing each other in parallel, and a third shaft 59 parallel to the above-mentioned first and second shafts 37 and 58 is stretched over the left side of the two plates to form a spring bearing. The member 56 is rotatably supported by the third shaft 59. The coil spring 54 in the compressed state is placed between the spring receiving members 55 and 56.
Is attached. The lower end of the valve shaft operating rod 28 is connected to the third shaft 59.

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 in the counterclockwise direction about the first shaft 37, and the second shaft 58, which is the connecting portion with the coil spring 54, moves downward to connect the first shaft 37 and the third shaft 59. , The coil spring 54 is compressed and deformed. Then, the float 3 further rises, the second shaft 58 is lined up on the line connecting the first shaft 37 and the third shaft 59, and the float 3 still rises and the second shaft 58 moves to the first shaft 58. When it moves below the line connecting the first shaft 37 and the third 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 third shaft 59 moves upward, 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. In conjunction with the upward movement of the shaft 40, the float arm 51 rotates clockwise around the first shaft 37, and the second arm, which is a connecting portion with the coil spring 54, is rotated.
Shaft 58 moves upward to move the first shaft 37 and the third shaft 59.
The coil spring 54 is compressed and deformed as it approaches the line connecting the two. Then, the float 3 further descends, the second shaft 58 is lined up on the line connecting the first shaft 37 and the third shaft 59, the float 3 still descends, and the second shaft 58 becomes 1 axis 37 and 3rd axis 5
When the coil spring 54 is moved above the line connecting 9 to recover its deformation, the sub arm 52 rotates counterclockwise and the third shaft 59 snaps downward. As a result, the valve shaft operating rod 28 connected to the third shaft 59 moves downward, the air supply valve 20 closes, and the exhaust valve 21 opens.

[0028]

In the liquid pumping device of the present invention, the valve shaft operating rod is connected to the third shaft which is the connecting portion between the coil spring and the sub arm. Therefore, the third shaft can also serve as the connecting portion of the valve shaft operating rod. Therefore, the liquid pumping device of the present invention,
There is an excellent effect that the number of parts can be reduced and the structure can be simplified.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of a snap mechanism in a liquid pumping device of the related art.

[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 Sub Arm 54 Compressed Coil Spring 58 Second Axis 59 Third Axis

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 on the first shaft, a float arm and a sub-arm rotating about the first shaft, and a support on the float arm at a point distant from the first shaft. A second axis parallel to the first axis, a third axis parallel to the first axis supported by the sub-arm at a point away from the first axis, The float has a compression coil spring mounted between the second and third shafts and rotatable in both mounting portions.
A liquid pumping device which is connected to a torch and wherein the switching valve is connected to the third shaft via a valve shaft operating rod.