JPH06265099A - Liquid force feed device - Google Patents

Abstract

PURPOSE:To provide a liquid force feed device in which when a valve opens or closes with snap move, vibration of a coil spring in lateral and axial direction is suppressed and thus spring breakage due to fatigue is prevented and also an accident of a coil spring being hitched to a pin is prevented. CONSTITUTION:A series of links is formed from main lever 41 swinging with a float, a slider 43 for swinging the main lever 41, a first lever 45 swinging with the swinging axis of the main lever 41 at its center and a second lever 45 for connecting the slider and the first lever together. A valve opens and closes with snap move of the first lever 45.

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 that temporarily collects the condensate generated in the steam piping system and sends this cover water 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
Often still has a considerable amount of heat. Therefore, in recent years, for effective use of energy, a condensate recovery system that recovers condensate and sends the condensate to a boiler or a waste heat utilization device to effectively utilize the waste heat has become widespread.

By the way, the initial condensate recovery system was connected directly from the discharge port of the steam trap to the water supply part of the boiler or the like, and the condensate was conveyed by its own pressure. However, the initial configuration described above is sufficient when the condensate is sent to the steam trap, that is, when the pressure on the secondary side of the steam trap is high, or when the condensate is sent to a position far from the steam load. There was a problem that it could not function. Therefore, in recent years, the condensate is once collected in a closed container, a high-pressure working fluid such as steam is further introduced into the closed container, and the condensate in the closed container is forcibly discharged by the pressure of the working fluid. Condensate is often collected using a liquid pumping device. This type of liquid pumping device has a configuration disclosed in, for example, Japanese Utility Model Application Laid-Open No. 50-147228.

A conventional liquid pressure-feeding device will be described below. FIG. 7 is a partial cross-sectional perspective view of a liquid pumping device of the related art. In the figure, reference numeral 100 indicates a conventional liquid pressure-feeding device. The liquid pumping apparatus 100 includes a float 120 inside a closed container 101 and a valve of the closed container 101 float 12
It has a built-in mechanism that opens and closes in accordance with the elevation of 0.

The closed container 101 has a liquid inlet 1 near the bottom.
02 and a liquid discharge port 103, and check valves 105 and 106 are attached to the liquid discharge port 103 and the liquid discharge port 103, respectively. Here, the check valve 105 is attached in a direction that allows the liquid to flow into the closed container 101. On the other hand, the check valve 106 is a closed container 1.
It is mounted in a direction that allows liquid to be discharged from 01 to the outside.

A working fluid inlet 108 and a working fluid outlet 109 are provided on the top of the closed container 101.
A valve 110 and a valve 111 are attached respectively. Here, the valves 110 and 111 are both operation rods 112 and 113.
The valve 110 is opened and closed by moving up and down. The valve 110 is opened when the operating rod 112 is raised, and the valve 111 is closed when the operating rod 113 is raised. The operating rods 112, 113 are connected in parallel by a connecting plate 115, and the valve 11 is moved by moving the connecting plate 115 up and down.
0 and 111 are opened and closed at the same time.

Reference numeral 116 denotes a fixing member, which is a closed container 101.
Is integrally fixed to the inner surface of the. The fixing member 116 is provided with a snap mechanism. Figure 8
FIG. 8 is a partially enlarged view of the snap mechanism of FIG. 7. The snap mechanism of the liquid pumping device of the prior art has two arms 11
8, 119 are swingably attached to the fixing member 116 by the shaft 107. And the arms 118, 11
Each end of 9 is connected by the tension coil spring 117.
One arm 118 has a float 120 and an elongated hole 124.
And is coupled via a pin 122, and follows the float 120 to swing up and down. The other arm 119 is
It is connected to the rod 123 via the shaft 121, and the rod 123 is further connected to the connecting plate 115.

The prior art liquid pumping device has a liquid inlet 1
02 is connected to the vapor load via the check valve 105, and the liquid discharge port 103 is connected to the waste heat utilization device via the check valve 106. The working fluid inlet 108 is connected to the steam source. The closed container 1 in the liquid pumping device 100 of the prior art
When there is no condensate in 01, the float 120 is at the bottom of the closed container 101. And the snap mechanism is arm 1
As shown by the solid line in FIG. 8, 18 and 119 are in the shape of a downward “<” and are stopped. When the condensate is generated in the steam load, the condensate is discharged from the check valve 105 to the closed container 101.
It flows in and accumulates. Then, as the amount of condensate increases, the float 120 rises, and with this, one end of the arm 118 rises. Then, when the arm 118 goes beyond the position where it is linear with the arm 119 as shown by the arrow H, the tension coil spring 117 generates a component force in the arm 119 in the upward direction of the drawing. Therefore, arm 1
As indicated by the chain double-dashed line, 19 jumps upward and snaps. Then, in the flip-up operation at this time, the rod 123 is lifted upward, and the valves 110, 111
Will switch. Then, through the valve 110, the closed container 101
The inside of the liquid is filled with steam, and the condensed water is pushed by the steam pressure to discharge the condensate from the liquid discharge port 103.

[0009]

In the liquid pumping device of the prior art, the arm 119 for operating the valves 110 and 111 is snap-moved by the action of the arm 118 and the tension coil spring 117 to surely open and close the valves 110 and 111. It is a thing. However, in the liquid pumping device of the prior art, the compression coil spring not only expands and contracts but also moves in the horizontal direction by the coil spring alone. Specifically, in the liquid pumping device of the prior art, the end of the compression coil spring, particularly the end on the side of the arm 119 on the side of the snap movement, was broken during use for a long period of time. The reason for this is as follows. That is, when the float 120 rises, the arm 118 on the side of the float 120 rises and the coil spring is extended. During this period, the tension coil spring 117 and the pin 122 relatively rotate, but the float 120 rises relatively slowly, so that the tension coil spring 117 and the pin 122 rotate smoothly. Therefore, during the operation during this period, an unreasonable force is not applied to the tension coil spring 117.

However, the arm 118 is then raised and the
When the H state is exceeded, the arm 119 suddenly makes a snap movement. At this time, the tension coil spring 117 and the pin 122
The rotation occurs in the same manner as in the case described above, but this rotation is extremely faster than in the case described above.

In addition, when the tension coil spring 117 is in the state of the arrow H, the tension coil spring 117 is in the maximum tension state, so that the tension coil spring 117 and the pin 1
The frictional force between 22 is large. Therefore, both ends of the tension coil spring 117, especially the arm 119 on the side of the snap movement.
A large bending stress is generated at the side end. Due to the nature of this type of liquid pumping device, the arm 1 is constantly used.
Reference numeral 19 is for snap movement. Therefore, an excessive stress is applied to the end portion of the tension coil spring 117 each time the snap movement occurs, and fatigue causes progress of microcracks, which eventually leads to breakage.

Further, in the liquid pumping device of the prior art, the tension coil spring 117 moves completely independently of the arm, and its movement locus passes through the pin 107 which is the swing center of the arms 118 and 119. Therefore, the tension coil spring 11
The coil spring may be caught by the pin 107 during the movement of the valve 7, and the valve may not be opened or closed. By the way, in this type of liquid pumping device, the arm 119 snaps to open the valve, and the condensate inside is discharged only after the vapor is filled in the closed container. Therefore, as described above, when the tension coil spring 117 is caught by the pin 107, the float 120 does not descend and does not return to its original state. Therefore, once the tension coil spring 117 is caught on the pin 107, the failure state is completely brought about.

In order to prevent such a situation, the extension coil spring 117 is designed to be attached as far away from the pin 107 as possible. However, the tension coil spring 117
As described above, the coil spring 117 itself vibrates greatly in the lateral direction because it independently moves horizontally apart from the arm. The tension coil spring 117 may be caught by the pin 107 during the vibration. Therefore, according to the configuration of the related art, the tension coil spring 117
However, it is difficult to completely prevent the failure of being caught by the pin 107.

Further, in the liquid pumping device of the prior art, the operation of the valve is uncertain, if not a failure, and there is room for improvement. That is, in the liquid pumping device of the prior art, the tension coil spring 117 not only vibrates laterally by horizontal movement as described above, but also vibrates longitudinally. Therefore, even after the arm 119 completes the snap movement, the tension coil spring 117 repeats a slight expansion / contraction at a constant cycle. Therefore, the arm 119 slightly swings, and the valves 110 and 111 interlocking therewith move.

The liquid pumping device of the present invention pays attention to the above-mentioned drawbacks of the prior art and provides a liquid pumping device which suppresses lateral and axial vibrations of a coil spring, has few failures, and operates reliably. The purpose is to

[0016]

The feature of the present invention for achieving the above object is that a float is disposed in a closed container having a working fluid inlet, a working fluid outlet, a liquid inlet and a liquid outlet. In a liquid pumping device that opens and closes at least one of the working fluid inlet and the working fluid discharge port according to the rise and fall of the float to pump the liquid accumulated in the sealed container from the liquid discharge port to the outside, A main lever that is swingably fixed to the main lever and that swings in response to lifting and lowering of the float; a slider that is slidably attached to the main lever; a first lever that is swingably fixed in a closed container; A second lever, which is mounted between the slider and a portion other than the swing center of the 1 lever, and both mounting portions are rotatable, and a slider that is inserted into the main lever and directs the slider to the swing center of the main lever. And a coil spring that biases the second lever, and the second lever snaps in response to lifting and lowering of the float, and the movement of the second lever opens and closes at least one of the working fluid inlet and the working fluid discharge port. On the device.

[0017]

In the liquid pumping device of the present invention, when there is no liquid in the closed container, the float is lowered and the main lever is in the initial position, as in the prior art. At this time, since the slider is biased toward the swing center of the main lever by the coil spring inserted in the main lever, the mounting portion of the second lever rotatably mounted on the slider moves toward that direction. Being energized. Then, the first lever is biased by the biasing force of the second lever so as to tilt in one of the directions about the support point with the closed container. In many cases, the second lever is configured so as to come into contact with some member so that the swing angle does not expand any further. By pressing the member with the second lever, the closed container, the main lever, the slider, the coil spring, The first lever and the second lever are kept stable. The working fluid inlet is closed by the action of the first lever.

When the liquid flows into the closed container,
The liquid raises the float. Then, the main lever swings away from the initial position. Where the first lever is
As described above, since the swing angle is not expanded further, only the second lever swings about the connecting portion with the first lever. As a result, the slider moves in the direction away from the swing center of the main lever against the biasing force of the coil spring. At this time, the coil spring receives a compressive or tensile force and contracts or extends.

When the swing angle of the main lever becomes constant, the second lever is aligned with the first lever. When the swing angle of the main lever further increases, a swing biasing force in the direction opposite to the initial state is generated in the first lever, and the repulsive force of the coil spring causes the first lever to snap with the second lever. Then, the working fluid inlet is opened,
The pressure in the closed container rises, and liquid such as condensate is discharged from the liquid discharge port to the outside.

Looking at the behavior of the coil spring during the snap operation of the liquid pumping apparatus of the present invention, the snap movement occurs when the main lever itself is almost stationary, so that the coil spring inserted in the main lever sways. Almost does not move in the moving direction. Naturally, no lateral vibration is generated in the coil spring. In addition, although the main lever may actually show some snap-moving behavior due to the play of the main lever, etc., since the coil spring is inserted in the main lever, the inner surface of the coil spring hits the main lever. , The coil spring never vibrates laterally. Therefore, in the liquid pumping device of the present invention, the bending stress is not unduly applied to the end of the coil spring. In addition, there is no concern that the coil spring will be caught on the pin.

Although the coil spring is greatly expanded and contracted in the axial direction, the coil spring is connected to the slider, and the slider slides on the main lever. Therefore, friction between the slider and the main lever causes energy of longitudinal vibration of the coil spring. Consumed. Therefore, in the liquid pumping device of the present invention, the coil spring has very little vibration even in the axial direction. Therefore, the vibration applied to the working fluid inlet and the working fluid outlet is extremely small.

[0022]

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. FIG. 2 is an enlarged sectional view taken along the line AA of FIG. FIG. 3 is a detailed cross-sectional view around the main lever of the liquid pumping device of FIG. FIG. 4 is an enlarged view of a main part of FIG. 1 when there is no condensate in the closed container. FIG. 5 is an enlarged view of a main part of FIG. 1 immediately before the snap movement occurs. FIG. 6 is an enlarged view of a main part of FIG. 1 immediately after the snap movement occurs.

In FIG. 1, reference numeral 1 shows a liquid pumping apparatus according to a specific embodiment of the present invention. The liquid pumping device 1 of the present embodiment is
The float 3 and the snap mechanism 5 are arranged in the closed container 2. In addition to the above configuration, the present embodiment also includes a double seat valve 6 that opens and closes the liquid discharge port.

The closed container 2 is of a horizontal type in this embodiment, the main body part and the lid part 9 are joined by a flange 10 and the liquid storage space 11 is formed inside. . In this embodiment, the main body 8 of the closed container 2 is a simple container, and the characteristic components of this embodiment are generally provided on the lid 9 of the closed container 2. That is, the lid 9 has 4
One opening, specifically, a working fluid inlet 12, a working fluid outlet 13, a liquid inlet 15, and a liquid outlet 16 are provided.

Working fluid inlet 12 and working fluid outlet 13
In the state where the closed container 2 is placed horizontally, two are arranged horizontally at a position corresponding to the upper part. An air supply valve 18 is built in the working fluid inlet 12.
The air supply valve 18 is such that the valve body 21 abuts the valve seat 23 and the working fluid introduction port 12 is closed by pulling the shaft 19 into the closed container 2.

On the other hand, an exhaust valve 25 is arranged in the working fluid guide / exhaust port 13. The exhaust valve 25 is the air supply valve 1 described above.
8 has a configuration completely opposite to that of FIG. 8 and pushes the shaft 26 toward the working fluid discharge port 13 so that the valve body 27 contacts the valve seat 29 to close the working fluid discharge port 13.
In the liquid pumping device 1 of the present embodiment, the air supply valve 18 and the exhaust valve 2
The shafts 19 and 26 of No. 5 are connected by a connecting plate 17, and a connecting rod 28 is fixedly attached to the connecting plate 17. Therefore, by pushing or pulling the connecting rod 28, one of the air supply valve 18 and the exhaust valve 25 is opened and the other is closed.

The liquid inlet 15 is located in the center of the lid 9.

The liquid discharge port 16 is provided at a position corresponding to the lower portion in a state where the closed container 2 is placed horizontally. The double-seat valve 6 is provided on the liquid storage space 11 side of the liquid discharge port 16. The double-seat valve 6 is a combination of a main body 30 and a valve body 31. The main body 30 of the double-seat valve 6 has a closed space connected to the liquid discharge port 16 and has openings on the upper and lower surfaces. A valve seat is provided on each lower surface of the upper and lower openings of the main body 30.

The valve body 31 has two valves 35 and 36 mounted in series on a valve shaft 38 with a constant space. The valve body 31 is arranged so as to abut a valve seat provided in an opening on the upper and lower surfaces of the main body 30. When the valve shaft 38 of the valve element 31 is lifted up, the double-seat valve 6 employed in this embodiment causes both of the valves 35 and 36 to abut on the valve seats provided in the upper and lower surfaces of the main body 30 respectively. The liquid storage space 11 is closed off from the outside. On the other hand, if the valve shaft 38 of the valve body 31 is lowered,
The valves 35 and 36 leave the valve seat, the liquid discharge port 16 and the liquid storage space 11 communicate with each other, and the bottom portion inside the closed container 2 communicates with the outside via the liquid discharge port 16.

The essential point of this embodiment is the construction of the snap mechanism 5. The snap mechanism 5 is a mounting bracket 4 integrally attached to the lid 9 of the closed container 2.
It is supported in the closed container 2 by 0. The structure of the snap mechanism 5 adopted in the present embodiment includes a main lever 41, a slider 43, a first lever 45, a second lever 46, a tension coil spring 47, and a float arm 49.

The main lever 41 includes a shaft 50 and a fork 5
1 is integrally fixed with a screw 48. Shaft 5
The shape of 0 is composed of three parts having different thicknesses, and is composed of a spring stop part 52, a spring insertion part 53, and a slide part 54, and is formed thinner toward the rear end in the order described above. The spring stop portion 52 has a groove 55 in the circumferential direction to integrally hold the end portion of the tension coil spring 47 described later.
Is provided. Further, a through hole 56 is provided in the spring stop portion 52 in a direction perpendicular to the axis, and a sleeve 57 is attached to the through hole 56.

The spring insertion portion 53 is a portion made thinner than the spring stop portion 52, and the thickness of this portion is constant.
The slide portion 54 is made thinner than the spring insertion portion 53, so that there is a step 58 between the slide portion 54 and the spring insertion portion 53. The rear end of the slide portion 54 is threaded to attach the fork portion 51. The fork portion 51 is a member having a groove 60 whose one end is open.

The outer appearance of the slider 43 has a small diameter portion 61 and a large diameter portion 62, and a through hole 63 is provided in the central axial direction. Further, the small-diameter portion 61 is provided with a groove 65 in the circumferential direction in order to integrally hold the end portion of the tension coil spring, similarly to the spring stopper portion 52 of the main lever 41 described above. On the outer peripheral surface of the large diameter portion 62, the pin 6 is perpendicular to the axial direction.
7 are erected.

The first lever 45 is a member provided with holes at both ends and in the middle thereof. The second lever 46 is a lever shorter than the other levers, and has through holes at both ends. The sum of the length from the hole provided in the middle of the first lever 45 to the hole at one end and the length between the holes at both ends of the second lever 46 is calculated from the through hole 56 of the main lever 41 to the step 58.
Longer than up to.

The float arm 49 has a float 3 at its tip.
Is attached to the end of the swing plate 69
Is attached. A sliding guide pin 70 is provided upright on the swing plate 69.

Next, the relationship between each member of the snap mechanism 5 will be described. The slider 43 is the slide portion 5 of the main lever 41.
It is attached to 4. The slider 43 can slide on the slide portion 54 of the main lever 41, but cannot move to the spring insertion portion 53 side from the gap 58.

The tension coil spring 47 is inserted into the spring insertion portion 53 of the main lever 41, and both ends thereof are integrally fixed to the spring stopper portion 52 of the main lever 41 and the small diameter portion 61 of the slider 43. Therefore, the slider 43 is biased toward the spring insertion portion 53 by the tension coil spring 47, and stops at the step 58 of the main lever 41 in the natural state.

The main lever 41 is provided at a position near the upper end of the mounting bracket 40 integrally mounted on the lid 9.
It is pivotally supported by a shaft 73 and can swing about a swing center formed by the shaft 73. A through hole in the middle of the first lever 45 is swingably supported by a shaft 73 which is a swing center of the main lever 41. Between the through hole at one end of the first lever 45 and the pin 67 of the slider 43 described above,
The second lever 46 is attached. Second lever 46
Both ends of the support are rotatable.

In summary, the slider 43 is slidably attached to the main lever 41 together with the tension coil spring 47, and one end of the second lever 46 is rotatably attached to the pin 67 of the slider 43. Lever 4
The other end of 6 is rotatably attached to one end of the first lever 45 via a pin 75, and finally, in the middle of the first lever 45, it is rotatably coupled to the spring stop portion 52 of the main lever 41 by a shaft 73. Has been done. Therefore, the main lever 41, the slider 43, the first lever 45, the second lever 46 and the tension coil spring 47 form a series of links.

The swing plate 69 of the float arm 49 is
The pin 76 is swingably fixed to the lower end of the mounting bracket 40. The sliding guide pin 70 provided upright on the swing plate 69 is provided on the fork portion 51 of the main lever 41.
It is fitted with the groove 60 provided in the.

In addition, a stopper pin 78 is erected on the mounting bracket 40 at a lower end position, more specifically, at a position where the rocking plate 69 abuts when the float arm 49 is most lowered. Further, a contact portion 80 whose position can be adjusted by a screw is provided on the lid 9 side of the first lever 45. Similarly, a contact portion 8 that can be positioned by a screw
1 is provided on the lid 9 side of the swing plate 69.

The relationship between the snap mechanism 5 and other members attached to the lid 9 is that the hole at the upper end of the first lever 45 forming the snap mechanism 5 has the pin 82 through the pin 82.
8 and the exhaust valve 25 are connected to a connecting rod 28 that works together. The pin 7 is attached to the swing plate 69 of the float arm 49.
The double-seat valve operating rod 85 is attached via 1, and the double-seat valve operating rod 85 is connected to the valve body 31 of the double-seat valve 6.

Next, the operation of the liquid pressure-feeding device 1 of this embodiment will be described by following a series of operating procedures using steam. First, the external piping of the liquid pumping device 1 is exactly the same as that of the conventional technology, the working fluid inlet 12 is connected to the steam source, and the working fluid outlet 13 is connected to the steam circulation piping. The liquid inlet 15 is connected to the vapor load via a check valve 86 that opens from the outside toward the liquid storage space 11. On the other hand, the liquid discharge port 16 is connected to the waste heat utilization device via a check valve 87 that opens outward from the liquid storage space 11.

Liquid reservoir space 1 of liquid pumping apparatus 1 of this embodiment
If there is no condensate in 1, float 3 is hanging to the bottom. In the snap mechanism 5 at this time, the slider 43 is biased by the tension coil spring 47 toward the shaft 73 which is the swing center of the main lever 41, and the slider 43
Is stopped at the position of the step 58 of the main lever 41. Here, since the length from the shaft 73 to the step 58 is shorter than the total of the length from the shaft 73 to the pin 75 and the length from the pin 75 to the pin 67, the first lever 45 and the second lever 46 are inevitable. It becomes a bent state.

When there is no condensate in the liquid storage space 11, the sliding guide pin 70 is attached to the liquid storage space 11 as shown in FIG.
The main lever 41 that is fitted to the center side of the
Is inclined toward the center of the liquid storage space 11 from the vertical direction. On the other hand, the lower end of the first lever 45 is tilted toward the lid 9 side about the shaft 73. As a result, the upper end of the first lever 45 is stopped while being closer to the center side of the liquid storage space 11 than the shaft 73. That is, the first lever 45 and the second lever 46 have an inverted V shape.
The connecting rod 28 is pulled to the liquid storage space 11 side by the first lever 45, the working fluid inlet 12 is closed,
The working fluid discharge port 13 is open.

When the eyes are moved to the double-seat valve 6, the double-seat valve operating rod 85 connected to the float arm 49 causes the valve element 31 to move.
Is drawn and the liquid discharge port 16 is closed. Therefore,
The liquid storage space 11 receives the influence of the high-pressure vapor from the liquid pressure-feeding device 1
It is not affected by the pressure on the secondary side, and is the same as the pressure in the load. Therefore, if condensate occurs in the load,
Condensed water flows into the liquid pumping device 1 from the liquid inflow port 15 and is stored in the liquid storage space 11.

Then, the float 3 floats by the condensed water stored in the liquid storage space 11. Then, the float arm 49 slowly rotates around the pin 76 in the direction of arrow B in FIG. Further, the main lever 41 fitted with the float arm 49 via the swing guide pin 70 swings along the swing of the float arm 49 around the shaft 73 which is the swing center as shown by an arrow C. And by the main lever 41,
The second lever 46 and the first lever 45 receive forces in the same direction. However, the contact portion 80 is provided on the lid 9 side of the first lever 45, and the first lever 45 has the contact portion 80.
And cannot move in the direction of arrow C.
Therefore, in the process of raising the float 3 described above, the first lever 45 does not move, and only the second lever 46 rotates about the pin 75.

Then, by the rotation of the second lever 46,
The slider 43 connected to this is in the direction of arrow D in FIG.
That is, it moves toward the fork portion 51. Therefore, the tension coil spring 47 is stretched, and the tension coil spring 47 is extended.
The energy stored in is increased. Then, when the float 3 floats further, the movement of the above-mentioned levers and the like progresses, and finally the first lever 45 and the second lever 4 are moved as shown in FIG.
6 line up on a straight line. In the present embodiment, the main lever 41 is also aligned with the first lever 45 and the second lever 46 on a straight line.

Then, when the float 3 further rises slightly, the first lever 45 and the second lever 46 become a slight "V" shape. As a result, the force of the slider 43 moving toward the swing center, that is, the force in the arrow E direction in FIG. 5, causes a component force in the arrow F direction in the first lever 45. Then, due to the component force in the direction of arrow E, the first lever 45 leaves the contact portion 80. The component force in the direction of arrow F increases more and more as the bending angle of the first lever 45 and the second lever 46 changes, so that the first lever 45 instantaneously snaps as shown in FIG. It swings greatly in the F direction.

The notable effect here is that only the first lever 45 and the second lever 46 move.
The main lever 41 does not swing at all, as can be understood by comparing FIGS. 5 and 6. Therefore, the tension coil spring merely contracts and there is no movement during the snap action. Therefore, there is no concern that the tension coil spring may be caught by other members due to an unreasonable force applied to both ends or the tension coil spring vibrating. Further, the tension coil spring contracts sharply during the snap operation, but the tension coil spring is connected to the slider 43, and since the slider 43 is inserted in the main lever 41 and a frictional force is generated, the tension coil spring is stretched. The axial vibration of the coil spring is sharply reduced.

As a result of the first lever 45 snapping,
The connecting rod 28 connected to the first lever 45 is pushed in to open the working fluid introduction port 12 and close the working fluid discharge port 13. In this embodiment, the exhaust valve 2
5, the valve body 27 contacts the valve seat 29, and the working fluid discharge port 13
When the connecting rod 28 is pushed in by a certain amount, the valve body 27 of the exhaust valve 25 comes into contact with the valve seat 29 and the connecting rod 28 does not move any more. Therefore, when the connecting rod 28 moves to the limit, the movement of the first lever 45 interlocked with this is stopped.

When the working fluid inlet 12 is opened, steam is introduced into the closed container 2 and the internal pressure rises. Further, at this time, the valve element 31 of the double-seat valve 6 is pushed down by the double-seat valve actuating rod 85 which is interlocked with the float arm 49. Therefore, the condensed water stored in the condensed water space 11 is pushed by the vapor pressure and is discharged from the liquid discharge port 16 to the external waste heat utilization device. As a result, the water level in the condensate storage space 11 drops, and the float 3 descends. And the snap mechanism 5
Follows a route completely opposite to the above, the main lever 41 swings in the G direction, and the first lever 45 and the second lever 46 are lined up again in a straight line. Then, the first lever 45 and the second lever 46 snap move in the opposite direction to the above. Even in this case, only the first lever 45 and the second lever 46 rapidly snap to move, and the main lever 41 remains stopped. Therefore, even in this case, only the first lever 45 and the second lever 46 move, and the main lever 41 does not swing at all. Therefore, there is no concern that the tension coil spring will be caught by other members due to an unreasonable force being applied to both ends or the tension coil spring vibrating. Further, the axial vibration of the tension coil spring causes the main lever 41 to vibrate.
Between the slider 43 and the slider 43 is rapidly reduced by the frictional force.

In the above embodiments, the tension coil spring for pressing the slider 43 is a tension coil spring,
The tension coil spring is provided between the swing center of the main lever 41 and the slider 43. However, the present invention can also employ a compression tension coil spring as the tension coil spring that presses the slider 43. When a compression coil spring is used instead of the tension coil spring of this embodiment, the compression coil spring is replaced by the slider 43 and the fork portion 51.
It will be provided between them.

In the liquid pressure feeding device 1 of this embodiment, the first
Although the swing center of the lever 45 is arranged at the same position as the main lever 41, the function of the present invention can be exerted even when the lever 45 is separated.

In the liquid pumping device 1 of this embodiment, the hermetically sealed container 2 is of a horizontal type, and the working fluid inlet and the working fluid discharge port are both arranged on the side of the hermetically sealed container 2. Illustrated. However, in the liquid pressure-feeding device of the present invention, the shape of the closed container is not particularly concerned,
It is of course possible to adopt a vertical type as exemplified in the prior art. In the case of adopting a vertical type closed container, a working fluid inlet and a working fluid outlet are generally arranged at the top of the container as shown in FIG. Therefore, the air supply valve and the exhaust valve need to move the connecting plate up and down. When the present invention is applied to an apparatus in which such a connecting plate needs to be moved up and down, for example, the first lever is changed from the linear one as in the above embodiment to the "L" -shaped one. By swinging the first lever, a vertical movement component is generated at the tip of the first lever, which can be easily dealt with.

[0056]

The liquid pumping device of the present invention is a series of link mechanisms composed of a main lever, a slider, a coil spring, a first lever, and a second lever, and causes a snap operation, so that a snap operation occurs. At times, the main lever and the coil spring inserted therein do not move.
Therefore, the liquid pressure-feeding device of the present invention does not apply an unreasonable force to both ends of the coil spring, and has an effect that the coil spring has a long life and few failures. Further, in the liquid pressure-feeding device of the present invention, the coil spring does not move during the snap operation, and naturally there is no lateral vibration, so that there is no failure in which the coil spring is caught by a pin or the like.

Further, in the liquid pumping device of the present invention, the axial vibration of the coil spring is consumed by the friction between the main lever and the slider, the longitudinal vibration of the coil spring is rapidly attenuated, and the valve operation is ensured. It has the excellent effect of preventing valve damage and prolonging its life.

[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 an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is a detailed cross-sectional view around a main lever of the liquid pumping device of FIG.

FIG. 4 is an enlarged view of a main part of FIG. 1 when there is no condensate in the closed container.

FIG. 5 is an enlarged view of a main part of FIG. 1 immediately before snap movement occurs.

FIG. 6 is an enlarged view of a main part of FIG. 1 immediately after snap movement occurs.

FIG. 7 is a perspective view, partly in section, of a conventional liquid pressure-feeding device.

8 is a partially enlarged view of the snap mechanism portion of FIG.

[Explanation of symbols]

 1 Liquid Pressurizing Device 2 Closed Container 3 Float 5 Snap Mechanism 6 Double Seat Valve 11 Liquid Reservoir Space 12 Working Fluid Inlet 13 Working Fluid Outlet 18 Air Supply Valve 25 Exhaust Valve 41 Main Lever 43 Slider 45 First Lever 46 Second Lever 47 tension coil spring 49 float arm 73 shaft 80 contact part

Claims (1)

[Claims] 1. A float is arranged in an airtight container having a working fluid inlet, a working fluid outlet, a liquid inlet and a liquid outlet, and at least the working fluid inlet and the working fluid outlet are arranged according to the elevation of the float. In a liquid pumping device that opens and closes one of them and pumps the liquid accumulated in the closed container from the liquid discharge port to the outside, a main lever that is swingably fixed in the closed container and that swings according to lifting and lowering of the float. A slider slidably attached to the main lever, a first lever swingably fixed in the closed container, and a slider mounted between the slider and a portion other than the swing center of the first lever. A first lever which has a second lever whose both mounting portions are rotatable and a coil spring which is inserted into the main lever and urges the slider toward the swing center of the main lever. And the second lever snaps,
At least one of a working fluid inlet and a working fluid outlet is opened and closed by the snap movement.