JPH10288200A - Liquid force feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce displacement resistance of a float arm and smooth an operation by providing first to seventh shafts, providing a spring between third and fourth shafts and providing a snap mechanism provided with a second spring between sixth and seventh shafts. SOLUTION: In this device, a second shaft 37 and a fifth shaft 51 are supported by a sealed container 2 symmetrically with respect to a first shaft 35, and a third shaft 46 and a sixth shaft 58 are supported by a float arm 34 symmetrically with respect to the first shaft 35. A seventh shaft 59 is supported by a second subarm 54 symmetrically with a fourth shaft 48 supported by a subarm 42 with respect to the first shaft 35. Between the third shaft 46 and the fourth shaft 48, a spring 43 is mounted. Between the sixth shaft 58 and the seventh shaft 59, a second spring 55 is mounted. By this constitution, the float arm 34 is energized by the second spring 55 in the direction opposite to the direction in which the first shaft 35 is energized by the spring 43 and does not locally perform pressure contact. Therefore, displacement resistance of the float arm 34 becomes small and an operation becomes smooth.

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 vessel 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. 3 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
An elevating rod 111 is connected to an intermediate portion of the pin 02 by a pin 107. The lifting rod 111 is connected to a switching valve (not shown), and the snap mechanism 100 is linked to the switching valve via the lifting rod 111. Also coil spring 1
The other end of 03 is connected to the float arm 101 by a pin 112 via a spring receiving member 115.

In the prior art liquid pumping apparatus, when condensate accumulates in a closed container (not shown), the float 108 floats,
In conjunction with the floating of the float 108, the coil spring 103
Moves upward, and 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.
When the angle between the coil spring 103 and the sub arm 102 exceeds 180 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 lifting rod 111 connected to the sub arm 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. Also, there is a problem that a large buoyancy is required to counter this large frictional resistance, and the outer shape is inevitably increased in size. 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]

Technical features of the present invention:
A float connected to one end of a float arm and a sub-arm are connected in a sealed container having a working fluid inlet, a working fluid outlet, a pumping liquid inlet, and a pumping liquid outlet. In a liquid pumping device having a switching valve and a snap mechanism built therein, the snap mechanism is supported in the closed container and swings the float arm, and the auxiliary shaft is supported in the closed container. A second shaft for swinging the arm, a third shaft supported by a float arm between the first and second shafts, and a sub-arm between the second and third shafts. 4th supported by
And a spring mounted between the third and fourth shafts, and the second sub-arm is supported in the closed container symmetrically to the second shaft with respect to the first shaft. The fifth axis, the first
A sixth axis supported by the float arm symmetrically to the third axis with respect to the first axis, between the fifth and sixth axes;
A seventh axis symmetrically supported by the second auxiliary arm with respect to the first axis between the first axis and the second axis, and a second axis mounted between the sixth and seventh axes. And a liquid pumping device including a spring.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the liquid pumping apparatus of the present invention, the first
The second axis and the fifth axis are symmetrically supported in the closed container with respect to the first axis, and the third axis and the sixth axis are symmetrically supported in the float arm with respect to the first axis. And a secondary arc with respect to the first axis
The seventh axis is symmetrical to the fourth axis supported by the second sub-arm.
And a spring is mounted between the third and fourth shafts, and a second spring is mounted between the sixth and seventh shafts. Therefore, the float arm is urged by the second spring in a direction opposite to the direction urged by the spring with respect to the first shaft, and does not locally press. 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. FIG. 2 is an enlarged sectional view taken along line DD of FIG. In FIG. 1, a liquid pumping apparatus 1 of the present embodiment includes a closed container 2
Inside, a float 3, a switching valve 4, and a snap mechanism 5 are arranged.

To explain sequentially, the closed container 2 is composed of a main body 7
And the lid portion 8 are connected by screws (not shown), and a liquid storage space 10 is formed therein. In the present embodiment, the main body 7 of the closed container 2 is a mere container, and the characteristic components of the present 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 inlet 11, a working fluid outlet 13, a pumping liquid inlet 16, and a pumping liquid outlet 17.

As shown in FIG. 2, the air supply valve 2 is located inside the working fluid inlet 11, that is, inside the closed container 2.
0 is attached, and an exhaust valve 21 is attached inside the working fluid discharge port 13. Here the air supply valve 20
Is constituted by a valve case 22, a valve body 23 and an elevating 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. Valve case 22
Are provided with four openings 26 for communicating the above-mentioned through holes with the outside. The valve element 23 has a spherical shape and is lifted by the tip of the lifting rod 24.

The tip of the valve case 22 of the air supply valve 20 is screwed into the working fluid inlet 11. And valve body 2
3 is on the working fluid inlet 11 side, and the lifting rod 24 is a valve case.
Through the through hole of the screw 22, it comes out to the closed container 2 side, and is connected to the following sub arm 42 of the snap mechanism 5 via the shaft 47.

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. The lifting rod 31 is connected to the sub arm 42 of the snap mechanism 5 via the shaft 47 described above. The switching valve 4 is constituted by the air supply valve 20 and the exhaust valve 21, and when the air supply valve 20 is opened, the exhaust valve 21 is closed,
When the air supply valve 20 closes, the exhaust valve 21 opens.

The pumping liquid inlet 16 is located substantially at the center of the lid 8, and the pumping liquid outlet 17 is provided at a position corresponding to the lower part of the closed container 2.

The float 3 is supported by a bracket 36 via a float arm 34 and a first shaft 35, and the snap mechanism 5 includes a second shaft 37 and a fifth shaft 5
1 and supported by the bracket 36. The second axis 37 and the fifth axis 51 are formed symmetrically with respect to the first axis 35. The bracket 36 is integrally attached to the lid 8 of the closed container 2 by screws (not shown). The bracket 36 is composed of two plates facing in parallel on the near side and the opposite side of the drawing, and the shafts 38, 39, 40, 52, 5
3 and the first, second and fifth shafts 35, 37, 51 described above.
Are connected to each other. The shafts 38 and 39 also serve as upper and lower stoppers of the float 3, respectively.
Is also used as a stopper for the sub arm 42, and the shafts 52 and 53 are
It also serves as a stopper for the sub arm 54.

The snap mechanism 5 includes a floating arm 34,
It comprises a sub arm 42, a second sub arm 54, a coil spring 43 in a compressed state, a second coil spring 55 in a compressed state, and spring receiving members 44, 45, 56, 57. The float arm 34 is composed of two plates facing in parallel,
Each plate has a "T" shape. The left end of the float arm 34 is connected to the float 3, and the right end is rotatably supported by the first shaft 35 and swings up and down about the first shaft 35. The right end of the float arm 34 protrudes upward and downward, the third shaft 46 parallel to the first shaft 35 is hung over the protruding portion, and the spring receiving member 44 is It is rotatably supported by a shaft 46. A sixth shaft 58 parallel to the first shaft 35 is hung over a portion projecting downward, and the spring receiving member 56 is rotatably supported by the sixth shaft 58. The third shaft 46 and the sixth shaft 58 are connected to the first shaft 35
Are formed symmetrically with respect to.

A sub arm 42 is rotatably supported on the second shaft 37 described above. The sub arm 42 is composed of two plates facing each other in parallel, and each plate has an "L" shape. A fourth shaft 48 parallel to the above-described first shaft 35 is bridged over the lower end of the sub arm 42, and a spring receiving member 45 is rotatably supported by the fourth shaft 48. The compressed coil spring 43 is attached between the spring receiving member 44 and the spring receiving member 45. In addition, the shaft 47 is wound around the left end of the sub arm 42,
The lower ends of the lifting rods 24, 31 are connected.

A second sub arm 54 is attached to the fifth shaft 51 described above.
Are rotatably supported. The second sub arm 54 is composed of two plates facing each other in parallel, each of which is "L".
It is shaped like a letter. On the upper end of the second sub arm 54, a seventh shaft 59 parallel to the first shaft 35 is wound.
A spring receiving member 57 is rotatably supported by a seventh shaft 59. The second coil spring 55 in a compressed state is attached between the spring receiving member 56 and the spring receiving member 57. The fourth shaft 48 and the seventh shaft 59 are connected to the first shaft 35
Are formed symmetrically with respect to.

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 11 is connected to a high-pressure steam source, and the working fluid discharge port 13 is connected to a steam circulation pipe. In addition, the pumping liquid inflow port 16 is connected to the liquid storage space 1
It is connected to a load such as a steam-using device via a check valve (not shown) that opens toward zero. On the other hand, the pumping liquid discharge port 17
Is connected to a liquid pressure destination such as a boiler via a check valve (not shown) which opens outward from the liquid storage space 10.

The liquid storage space 1 of the liquid pumping device 1 of the present embodiment.
If there is no condensate within 0, 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 16 to the liquid pumping device 1 and accumulates in the liquid storage space 10.

When the float 3 rises due to the condensed water collected in the liquid storage space 10, the float arm 34 rotates clockwise about the first shaft 35. Then, the third shaft 46, which is a connection portion with the coil spring 43, moves rightward to approach a line connecting the second shaft 37 and the fourth shaft 48, and the coil spring 43 is deformed, and the second coil spring 55 The sixth shaft 58, which is a connecting portion of the fifth shaft 5
Approaching the line connecting the first and seventh shafts 59, the second coil spring 5
5 is deformed. When the float 3 further moves up and the third shaft 46 moves to the right of the line connecting the second shaft 37 and the fourth shaft 48, the sixth shaft 58 changes to the fifth shaft 51. When the coil spring 43 and the second coil spring 55 move to the left from the line connecting the second axis and the seventh axis 59, the deformation of the coil spring 43 and the second coil spring 55 recovers rapidly, and the sub-arm 42 and the second sub-arm 54 move clockwise. Rotate rapidly. As a result, the lifting rods 24 and 31 connected to the shaft 47 of the sub arm 42 snap move upward, and the air supply valve 2
0 is opened and the exhaust valve 21 is closed.

When the working fluid inlet 11 is opened, high-pressure steam is introduced into the closed vessel 2 and the internal pressure rises.
The condensed water collected in the liquid storage space 10 is pushed by the vapor pressure and discharged from the pumping liquid discharge port 17 to an external boiler or waste heat utilization device via a check valve (not shown).

When the condensate is discharged and the water level in the condensate storage space 10 drops and the float 3 descends, the float arm 34 rotates counterclockwise about the first shaft 35. . Then, the third shaft 4 which is a connecting portion with the coil spring 43
6 moves to the left to approach a line connecting the second shaft 37 and the fourth shaft 48, the coil spring 43 is deformed, and the sixth shaft 58, which is a connecting portion with the second coil spring 55, moves rightward. To approach the line connecting the fifth shaft 51 and the seventh shaft 59,
The second coil spring 55 is deformed. Then, the float 3 further descends, and the third shaft 46 becomes the second shaft 37 and the fourth shaft 48.
When the sixth axis 58 moves to the left from the line connecting the fifth axis 51 and the seventh axis 59, the coil spring 43 and the second coil spring 55 suddenly move. The deformation is recovered, and the sub-arm 42 and the second sub-arm 54 rapidly rotate counterclockwise. As a result, the sub arm 42
The elevating rods 24 and 31 connected to the shaft 47 move downward, and the air supply valve 20 is closed and the exhaust valve 21 is opened.

[0027]

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 diameter 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 an enlarged sectional view taken along the line DD of FIG.

FIG. 3 is a cross-sectional view of a snap mechanism in a conventional liquid pressure feeding device.

[Explanation of symbols]

 2 Sealed Vessel 3 Float 4 Switching Valve 5 Snap Mechanism 11 Working Fluid Inlet 13 Working Fluid Outlet 16 Pumping Liquid Inlet 17 Pumping Liquid Outlet 20 Supply Valve 21 Exhaust Valve 34 Float Arm 35 First Axis 37 Second axis 42 Secondary arm 43 Coil spring 46 Third axis 48 Fourth axis 51 Fifth axis 54 Second auxiliary arm 55 Second coil spring 58 Sixth axis 59 Seventh axis

Claims (1)

[Claims] 1. A closed container having a working fluid inlet, a working fluid outlet, a pumping liquid inlet, and a pumping liquid outlet,
A float connected to one end of the float arm and a secondary arm
In a liquid pumping device having a switching valve connected to a system and a snap mechanism built therein, the snap mechanism includes a first shaft supported in the closed container for swinging the float arm, and a first shaft mounted in the closed container. A second shaft supported and swinging the sub-arm, a third shaft supported by the float arm between the first and second shafts, and a second shaft and a third shaft. A fourth shaft supported between the third and fourth shafts supported by the sub-arm between the third arm and the fourth shaft; A fifth axis supported to swing the second sub-arm and supported by the float arm between the first and fifth axes symmetrically with respect to the first axis with respect to the third axis; A sixth axis, a seventh axis supported by the second sub-arm symmetrically to the fourth axis with respect to the first axis between the fifth and sixth axes, and a sixth axis. And between the seventh axis Liquid pumping apparatus characterized by comprising a second spring that is kicked.