JPH10141592A - Liquid feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid feeding device which can smoothly be operated by reducing displacement resistance of a float arm. SOLUTION: A float 3, a selector valve 4 and a snap mechanism 5 are housed inside a closed vessel 2. The snap mechanism 5 has first to third shafts 58, 60, 61 supported inside the closed vessel 2, a float arm 51 rotated around the first shaft 58, first and second spring receivers 52, 53 arranged on the float arm 51, a third spring receiver 54 rotated around the second shaft 60, a fourth spring receiver 55 rotated around the third shaft 61, a first inversion plate spring 56 arranged between the first spring receiver 52 and the third spring receiver 54, and a second inversion plate spring 57 arranged between the second spring receiver 53 and the fourth spring receiver 55 symmetrically to the first inversion plate spring 56 in respect to the first shaft 58.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

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

[0003] A liquid pressure feeding device used in a condensate recovery system collects condensed water in a closed container, and switches a switching valve to introduce a high-pressure working fluid such as steam into the closed container. The condensate in the closed vessel 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 store as much condensed water as possible in a closed container and to switch the switching valve reliably.

Therefore, in the liquid pressure feeding device, a snap mechanism using a coil spring is generally adopted, and the switching of the switching valve has been surely performed. 2. Description of the Related Art An example of a liquid pumping device including a snap mechanism using a coil spring includes a configuration disclosed in US Pat. No. 5,141,405.

FIG. 2 is a front view of a snap mechanism of a conventional liquid pressure feeding device. The above-mentioned U.S. Pat.
In the liquid pumping device disclosed in Japanese Patent Application Publication No.
Is constituted by a float arm 101, a sub arm 102 and a coil spring 103 in a compressed state. The float arm 101 is supported by a pin 106 with respect to the support member 105.
Is fixed to be swingable by the
Is attached.

[0006] 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. Secondary arm 1
A valve shaft operating rod 111 is connected to an intermediate portion of the valve 02 by a pin 107. The valve stem 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 stem operating rod 111.

The other end of the coil spring 103 in FIG. 2 is connected to the float arm 101 by a pin 112 via a spring receiving member 115. In the conventional liquid pumping apparatus, when condensed water accumulates in a closed container (not shown), the float 108 floats, 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, and the coil spring 103 and the sub arm 102 are arranged in a straight line. The float 108 still rises, and the angle between the coil spring 103 and the sub arm 102 becomes 18.
When the angle exceeds 0 degrees, the coil spring 103 rapidly recovers from the 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 connected to the sub arm 102 moves downward, and the switching valve (not shown) is rapidly switched.

[0008]

The prior art liquid pumping apparatus has a problem in that the operation is not smooth because the resistance caused by the frictional force between the float arm 101 and the pin 106 is large. In addition, there is a problem that a large buoyancy is required to oppose the large frictional resistance, and the outer shape is inevitably increased. This is because the float arm 101 is urged in the direction of arrow A by the coil spring 103 and the pin 1
This is because the connector 106 is in pressure contact with a portion B at the right end of the pin 106 at the connection portion with the pin 06.

An object of the present invention is to provide a liquid pumping device which operates smoothly by reducing the displacement resistance of a float arm, paying attention to the above-mentioned problems of the prior art.

[0010]

SUMMARY OF THE INVENTION A feature of the present invention is that a float, a switching valve and a snap mechanism are provided in a closed container having a working fluid inlet, a working fluid outlet, a pumping liquid inlet and a pumping liquid outlet. A self-contained snap mechanism includes first to third shafts supported in the closed container, a float arm rotating about the first shaft, and a first arm formed on the float arm. A second spring bearing, a third spring bearing rotating about a second axis, a fourth spring bearing rotating about a third axis, and a first spring bearing and a third spring bearing. A first reversing leaf spring disposed and a second reversing leaf spring disposed between the second spring bearing and the fourth spring bearing symmetrically with respect to the first axis. The present invention is characterized by a liquid pumping device.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a liquid pumping apparatus according to the present invention, first to third shafts are supported in a closed container, and first and second shafts are rotated around the first shaft. Is formed, a first reversing leaf spring is disposed between the first spring receiver and a third spring receiver that rotates about a second axis,
The second reversing leaf spring is arranged between the second spring bearing and the fourth spring bearing rotating about the third axis symmetrically with respect to the first reversing leaf spring. Therefore, the float arm is urged by the second inverting leaf spring in a direction opposite to the direction in which it is urged by the first inverting leaf spring with respect to the first axis, and is not locally pressed. Therefore, the float arm has a small displacement resistance and the operation is smooth.

[0012]

EXAMPLES Specific examples of the present invention will be described below. FIG. 1 is a sectional view of a liquid pumping apparatus according to a specific embodiment of the present invention. The liquid pumping apparatus 1 of this embodiment has a float 3, a switching valve 4, and a snap mechanism 5 arranged in a closed container 2.

In the sealed container 2, a lid 11 is connected to a main body 10 in which a bottom plate 8 and a top plate 9 are welded to a side cylinder 7 by bolts (not shown), and a liquid storage space 12 is formed therein. It was formed. In this embodiment, the closed container 2
A pumping liquid inlet 13 and a pumping liquid outlet 14 are provided in the lower part of the main body 10 of the first embodiment.
A working fluid outlet 16 is provided.

An air supply valve 20 is mounted inside the working fluid inlet 15, that is, inside the sealed container 2, and an exhaust valve 21 is mounted inside the working fluid outlet 16. Here, the air supply valve 20 is constituted by 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 part of the valve case 22, there are provided four openings 26 for communicating the aforementioned through holes with the outside. The valve element 23 has a hemispherical shape, and is integrally attached to the tip of the lifting rod 24.

In the liquid pressure feeding device 1 of the present embodiment, the air supply valve 2
The leading end of the zero valve case 22 is screwed into the working fluid inlet 11. And the valve body 23 is the working fluid inlet 1
On one side, the lifting rod 24 passes through the through hole of the valve case 22 to the closed container 2 side, and comes into contact with 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 includes 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 provided inside the through hole, and a valve body 30 held and fixed to the tip of an elevating rod 31 from below the valve seat 32 is brought into contact therewith. It opens and closes. Note that the valve shaft operating rod 28 and the elevating rod 31 are connected by a pin 33. The switching valve 4 is constituted by the air supply valve 20 and the exhaust valve 21. The exhaust valve 21 is closed when the air supply valve 20 is opened, and the exhaust valve 21 is opened when the air supply valve 20 is closed.

The snap mechanism 5 has a float arm 51,
It comprises first to fourth spring supports 52, 53, 54, 55, and first and second reversing leaf springs 56, 57, and the floating arm 51 has a bracket 59 via a first shaft 58. It is rotatably supported by. The bracket 59 is integrally attached to the side cylinder 7 of the sealed container 2, and the first shaft 58, the second and third shafts 60,
61 and shafts 62 to 66 are bridged and connected. The shaft 62 also serves as a stopper for the third spring receiver 54, the shafts 63 and 64 also serve as upper and lower stoppers for the float arm 51, and the shafts 65 and 66 also serve as stoppers for the fourth spring receiver.

A shaft 67 is mounted on the left end of the float arm 51, and a connecting member 68 fixed to the float 3 by welding is rotatably mounted on the shaft 67. The float 3 swings up and down around a shaft 67 supported by the float arm 51. Float arm 5
After the float 3 swings by a predetermined amount, the float 1 swings up and down around the first shaft 58 in conjunction with the float 3.

At the right side of the float arm 51, first and second spring receivers 5 projecting upward and downward in a "V" shape.
2, 53 are formed. The left and right pieces of the “V” -shaped portion of the first spring receiver 52 form a suppressing member 69 that suppresses and reverses the curvature of the first reversing leaf spring 56, and the “V” of the second spring receiver 53. The left piece and the right piece of the letter-shaped portion constitute a suppressing member 70 that suppresses the curve of the second reversing leaf spring 57 and reverses it. A third spring receiver 54 having a portion projecting downward in a “V” shape on the second shaft 60 is rotatably supported,
A fourth spring receiver 55 having a portion projecting upward in a “V” shape is rotatably supported on the third shaft 61. A first reversing leaf spring 56 curved between the first spring bearing 52 and the third spring bearing 54 is disposed, and a second reversing leaf spring curved between the second spring bearing 53 and the fourth spring bearing 55. 57
Is arranged. Further, a shaft 71 is wound around the right end of the third spring receiver 54, and the lower end of the valve shaft operating rod 28 is connected thereto.

Next, the operation of the liquid pumping apparatus 1 of the present embodiment will be described by following a series of operation procedures when steam is used as a working fluid. First, the working fluid introduction port 15 is connected to a high-pressure steam source, and the working fluid discharge port 16 is connected to a steam circulation pipe. In addition, the pumping liquid inlet 13 is connected to the liquid storage space 1 from outside.
It is connected to a load such as a steam-using device via a check valve (not shown) which opens toward 2. On the other hand, the pumping liquid discharge port 14
Is connected to a liquid pressure destination such as a boiler via a check valve (not shown) which opens from the liquid storage space 12 to the outside.

The liquid storage space 1 of the liquid pumping device 1 of the present embodiment.
If there is no condensate inside 2, the float 3 is located at the bottom as shown in FIG. At this time, the air supply valve 20 of the switching valve 4 is closed, and the exhaust valve 21 is open. Then, when condensed water is generated in a load such as a steam-using device, the condensed water flows down from the pumping liquid inlet 13 to the liquid pumping device 1 and accumulates in the liquid storage space 12.

The float 3 floats while rotating clockwise about the shaft 67 due to the condensed water stored in the liquid storage space 12, and after floating by a predetermined amount, the float arm 51 is moved to the first position. It rotates clockwise about axis 58. The clockwise rotation of the float arm 51 causes the left piece of the restraining member 69 of the first spring receiver 52 to abut on the first reversing leaf spring 56, thereby forming the first reversing leaf spring 56 into an "S" shape. And the right piece of the suppressing member 70 of the second spring receiver 53 is
The second reversing leaf spring 57 is brought into contact with the reversing leaf spring 57 and the "S"
The first and second reversing leaf springs 56 and 57 are reversed in the shape of a letter. The first and second reversing leaf springs 56, 57
, The third and fourth spring receivers 54 and 55 rotate counterclockwise, and the shaft 71 snaps upward. As a result, the valve shaft operating rod 28 connected to the shaft 71 moves upward, the air supply valve 20 is opened, and the exhaust valve 21 is opened.
Is closed.

When the air supply valve 20 is opened, high-pressure steam is introduced into the closed vessel 2 and the internal pressure increases, and the condensate collected in the liquid storage space 12 is pushed by the vapor pressure to be pumped. The liquid is discharged from the liquid discharge port 14 to an external boiler or a waste heat utilization device via a check valve (not shown).

When the water level in the condensate storage space 12 decreases as a result of discharging the condensate water, the float 3 descends while rotating counterclockwise about the shaft 67, and after descending a predetermined amount, the float 3 The arm 51 rotates counterclockwise about the first shaft 58. By the rotation of the float arm 51 in the counterclockwise direction, the right piece of the suppressing member 69 of the first spring receiver 52 abuts on the first reversing leaf spring 56 to reverse the first reversing leaf spring 56 by "S". And the left piece of the suppressing member 70 of the second spring receiver 53 abuts against the second reversing leaf spring 57 to curve the second reversing leaf spring 57 into an inverted “S” shape, and The second reversing leaf springs 56 and 57 are reversed. By the reversal of the first and second reversing leaf springs 56, 57, the third and fourth spring receivers 54, 55 rotate clockwise to rotate the shaft 71.
Snaps down. As a result, the valve shaft operating rod 28 connected to the shaft 71 moves downward, and the air supply valve 20 is closed and the exhaust valve 21 is opened.

[0025]

The liquid pumping device of the present invention has a floater
Since the displacement resistance of the system is small and the operation is smooth, a small float can be used and there is an excellent effect that the outer shape of the device can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a front view of a snap mechanism of a conventional liquid pressure feeding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 Closed container 3 Float 4 Switching valve 5 Snap mechanism 13 Pumping liquid inlet 14 Pumping liquid outlet 15 Working fluid inlet 16 Working fluid outlet 20 Air supply valve 21 Exhaust valve 51 Float arm 52 First spring Receiver 53 Second spring receiver 54 Third spring receiver 55 Fourth spring receiver 56 First reversing leaf spring 57 Second reversing leaf spring 58 First shaft 60 Second shaft 61 Third shaft 69 Suppression member 70 Suppression member

Claims (1)

[Claims] An airtight container having a working fluid inlet, a working fluid outlet, a pumping liquid inlet, and a pumping liquid outlet has a float, a switching valve, and a snap mechanism built therein. A first to a third shaft supported by the first arm, a float arm rotating about the first axis, first and second spring supports formed on the float arm, and a second arm. A third spring bearing that rotates about the axis of the third, a fourth spring bearing that rotates about the third axis, a first reversing leaf spring disposed between the first spring bearing and the third spring bearing, A liquid pumping device, comprising: a second reversing leaf spring disposed between the second and fourth spring supports symmetrically to the first reversing leaf spring with respect to the first axis.