JP3030528B2 - Liquid pumping device - Google Patents

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. Liquid pumping apparatus of the present invention, once collected condensate generated in a steam piping system, particularly those suitable as device for feeding this condensate 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:
Often it still has a significant amount of heat. Therefore, in recent years, condensate recovery systems that collect condensed water using a liquid pumping device and send this condensed water to a boiler or waste heat utilization device to effectively use waste heat have become widespread in recent years for effective use of energy. I have.

[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 switch the switching valve at a stroke in order to recover as much water as possible in the closed vessel.

[0004] Therefore, in the liquid pressure feeding device, a snap mechanism using a coil spring is generally employed. 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. 9 is a front view of a snap mechanism of a conventional liquid feeding device. The above-mentioned U.S. Pat.
In the liquid pumping device disclosed in Japanese Patent Application Publication No.
Is composed of a main arm 101, a sub arm 102, and a coil spring 103. The main arm 101 is swingably fixed to the support member 105 by a pin 106, and a float 108 is attached to the distal end side.

The sub arm 102 has one end connected to the support member 105 by the same pin 106 as the main arm 101, and the other end connected to one end of the coil spring 103 by the pin 110. An operating rod 111 is connected to an intermediate portion of the sub arm 102. The operating rod 111 is connected to a switching valve (not shown), and the snap mechanism 100 is linked to the switching valve via the operating rod 111.

The other end of the coil spring 103 is
To the main arm 101. In the conventional liquid pressure feeding device, when condensed water accumulates in a closed container (not shown), the float 108 floats. Then float 108
Of the coil spring 103 in conjunction with the floating of the
The fifth side moves upward, and the coil spring 103 is compressed and deformed. Then, the float 108 further rises, and the coil spring 1
03 and the sub-arm 102 are arranged in a straight line, and when the float 108 still rises and the angle between the coil spring 103 and the sub-arm 102 exceeds 180 degrees, the coil spring 103 rapidly recovers from deformation, and the coil spring 103 and the sub-arm 102 The connection (pin 110) between them snaps down. As a result, the operating rod 111 moves downward, and a switching valve (not shown) is rapidly switched.

[0008] By the way, the conventional liquid pressure feeding device 100
As shown in FIG. 9, the coil spring 103 employed in the above was provided with spring receiving members 115 and 116 at both ends. The spring receiving members 115 and 116 used in the related art are members that are separate from each other.
It merely functions to support the end of the coil spring 103 and connect it to another member with a pin. That is, the only member connecting the spring receiving members 115 and 116 is the coil spring 103.

[0009]

The prior art liquid pumping apparatus 100 is capable of relatively efficiently pumping liquid with a simple structure, but has a problem that the coil spring is easily damaged. . That is, when the conventional liquid pumping apparatus 100 is used for a long time, there is a disadvantage that the coil spring is deformed. In severe cases, the coil spring may buckle and the operation of the liquid pumping device 100 may become impossible. Further, in the liquid pumping device 100 of the related art, the end of the coil spring is easily worn, and sometimes the coil spring comes off.

Such a problem that the coil spring is easily damaged is not a disadvantage peculiar to the liquid pumping apparatus 100 disclosed in US Pat. No. 5,141,405, but is common to other liquid pumping apparatuses. .

Particularly in recent years, the overall shape of the liquid pumping device has been
There is a strong demand for smaller coil springs, making it impossible to use coil springs.
The coil spring is easily damaged. The present invention focuses on the above-mentioned problems of the prior art, miniaturization of the whole shape
An object of the present invention is to provide a liquid pumping device which is possible, has little damage to a coil spring, and has high durability.

[0012]

Means for Solving the Problems The present inventors have investigated the cause of the damage to the coil spring in order to prevent the damage. That is, in the liquid pumping apparatus of the related art, when there is no condensed water in the closed container, the coil spring 103 and the sub arm 102 have the shape of a “ku” that opens downward as shown in FIG. Focusing on the shape of the coil spring 103 at this time, the spring receiving members 115 at both ends of the coil spring 103,
116 is on the same axis, and the coil spring 103 has a linear shape.

When condensed water accumulates in the closed container and the float 108 floats, the spring receiving member 115 rises in conjunction with the float 108, and the float 108 side of the coil spring 103 moves upward. And the spring receiving member 115,
116 receives the moment from the coil spring 103 and tries to swing around the pins 112 and 110, respectively. However, the pins 112 and 110 are constantly receiving a pressing force by the coil spring 103, and the pin 108 is moved upward on the float 108 side of the coil spring 103.
The pressing force applied to 2,110 further increases. For this reason, the rotation of the spring receiving members 115 and 116 is inevitably smooth, and the spring receiving members 115 and 11 as shown in FIG.
The axis of 6 is shifted. Then, the coil spring 103 becomes “S”
It curves like a letter. Therefore, the end portion of the coil spring 103 rubs against the boss portions 120 and 121 of the spring receiving members 115 and 116 and is worn. Further, the coil spring 103 is deformed by simultaneously receiving the compressive force and the moment, and finally buckles.

A feature of the present invention completed on the basis of the above knowledge is that a sealed container has a built-in float and a snap mechanism that swings with a shaft, and the sealed container has a switching valve for switching between supply and exhaust of a working fluid. A liquid inlet and a liquid outlet are provided, and the snap mechanism has a coil spring linked to the switching valve, and at least one end of the coil spring is linked to the float, and is deformed according to the movement of the float, and the float is moved. when exceeding the predetermined position, the coil spring is restored rapidly deformed, the liquid pumping device for switching the switching valve that is linked to a coil spring, the snap mechanism has one end rotatably shaft sealed the other end of the float
The shaft that fits with the shaft and swings following the float
Has a bar, the coil spring is fitted on the axis of the continuous, one end of the coil spring is coupled to the spring receiving member that slides axial one end of the coil spring is coupled with the lever via the spring receiving member And the other end is a switching valve
In the linked liquid pumping device.

[0015]

In the liquid pressure feeding device of the present invention , the snap mechanism is
As one of the members, one end is rotatably fixed to the shaft and the other end is
It is fitted with the shaft of the funnel and swings following the float
It has a moving lever. That is, in the liquid pumping apparatus of the present invention,
Is a shaft that swings together with the float, and a lever
Having. And the lever is fitted with the float shaft
And swings following the float. Because of this
In clear liquid pumping equipment, the float shaft itself must be shortened.
And the swing radius of the float is small. That
Therefore, the liquid pumping device of the present invention is smaller than the conventional technology.
It is possible. Also reduce the size of the prior art liquid pumping device
And the coil spring tends to be damaged as described above.
The invention does not adequately address coil spring damage.
Have been. That is, the coil used in the liquid pumping device of the present invention.
The spring is sheathed on a continuous shaft center, and the coil spring
One end is connected to a spring receiving member that slides on the shaft,
The end is connected to the lever via the spring receiving member,
The other end is linked to a switching valve. Therefore, when one end of the coil spring moves in conjunction with the float and the angle of the end changes, the other end is forcibly rotated by the axis centered on the coil spring. Therefore, both ends of the coil spring always face each other when the coil spring moves or snap moves, and the coil spring always deforms only in the expansion and contraction direction while maintaining a linear state. Therefore, the end of the coil spring does not rub against the spring receiving member or the like, and no bending moment is applied to the coil spring.

[0016]

EXAMPLES Hereinafter, specific examples of the present invention will be described. 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 view of a main part of FIG. FIG.
FIG. 2 is a sectional view of a coil spring and a spring receiving member employed in the liquid pressure feeding device of FIG. 1. FIG. 4 is a sectional view taken along line AA of FIG. FIG. 5 is a sectional view taken along line BB of FIG. FIG.
FIG. 2 is a view as viewed in the direction of arrow C in FIG. 1. 7 and 8 are enlarged views of the main part of FIG. 1 showing the behavior of the snap mechanism employed in the liquid pressure feeding device of the present invention.

In FIG. 1, reference numeral 1 denotes a liquid pumping apparatus according to a specific embodiment of the present invention. The liquid pumping device 1 according to the present embodiment includes:
A float 3 and a snap mechanism 5 are arranged in a closed container 2.

To be described sequentially, the closed container 2 includes a main body 7
And a lid 8 are connected by screws 9 to form a liquid storage space 10 therein. In this embodiment, the closed container 2
Is a mere 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 inlet 11, a working fluid outlet 13, a liquid inlet 16, and a liquid outlet 17.

The working fluid inlet 11 opens horizontally from the upper end of the outer side surface of the lid 8 as shown in FIG. 6, and joins with the vertical hole to open downward in the sealed container 2. The working fluid outlet 13 is a hole that penetrates straight downward from the top of the lid 8. Further, an air supply valve 20 is built in the working fluid inlet 11 as shown in FIG. The air supply valve 20 closes the working fluid introduction port 11 by pulling the shaft 21 toward the inside of the closed container 2 so that the valve body 23 contacts the valve seat.

On the other hand, the exhaust valve 2 is provided in the working fluid outlet 13.
5 are arranged. The exhaust valve 25 is connected to the air supply valve 20 described above.
By pressing the shaft 26 toward the working fluid outlet 13, the valve body 28 comes into contact with the valve seat to close the working fluid outlet 13. In the liquid pumping apparatus 1 of the present embodiment, the shafts 21 and 26 of the supply valve 20 and the exhaust valve 25 are connected by a connecting plate 30. Therefore, by moving the connecting plate 30 up and down, one of the air supply valve 20 and the exhaust valve 25 is opened, and the other is closed. That is, in this embodiment, a supply / exhaust switching valve is constituted by the pair of the supply valve 20 and the exhaust valve 25.

In FIGS. 1 and 6, reference numeral 24 denotes a steam deflecting plate, which prevents steam injected from the air supply valve 20 from directly contacting the condensate. It acts as a baffle for the

The liquid inlet 16 is located at the center of the lid 8.
The liquid discharge port 17 is provided at a position corresponding to a lower part of the closed container 2.

The float 3 is supported by a bracket 32, and the snap mechanism 5 is supported by a bracket 33. The bracket 33 and the bracket 32 are connected by screws (not shown) and are integrally attached to the lid 8 of the closed container 2. First, the shape of the mounting brackets 32 and 33 will be described. When viewed from above, the mounting bracket 33 has a “U” shape as shown in FIG. 4, and a flange 35 is provided at an end. As shown in FIG. 2, the mounting bracket 33 passes through the stop shaft 31 and is fixed to the lid 8 by the stop shaft 31. On the other hand, the mounting bracket 32 is composed of two “L” shaped plates, and is screwed to the flange 35 of the mounting bracket 33, respectively. The mounting bracket 32 is shown in FIG.
The shafts 38, 39 and 40 are stretched between two "L" -shaped plates to maintain rigidity. The shafts 38, 39 also serve as upper and lower stoppers of the float 3, respectively.

The shaft 40 also serves as a swing shaft of the float 3. The float 3 has the above-described shaft 40 penetrated by the float shaft 43, and swings up and down around the shaft 40. Therefore
The swing radius of the float 3 is smaller than that of the prior art. A pin 45 is attached to an end of the float shaft 43.

Between the U-shaped plates of the mounting bracket 33, a shaft 46 serving as a swing fulcrum, which will be described later, and four roller shafts 47 are stretched as shown in FIGS. I have. The roller shaft 47 is provided with the guide roller 4 in the middle.
Numeral 8 is attached so as to rotate freely. The guide roller 48 has a groove 50 at the center as shown in FIG.
The roller shaft 47 is a pair of two roller shafts, and each pair of roller shafts is attached in a vertical direction.

The snap mechanism 5 includes a lever 52, a slider 53, a coil spring 54, a male spring receiving member 55, and a female spring receiving member 56.

The lever 52 is formed by bending a plate into a "U" shape as shown in FIG.
Two plates 59 face in parallel. And two boards 5
A groove 58 is provided at the distal end of 9. Lever 52
Are located between the “U” shaped plates of the mounting bracket 33, the ends of which are supported by a shaft 46. A groove 58 at the end of the lever 52 has a float shaft 43.
Pin 45 is fitted. Therefore, the lever 52 follows up and down of the float 3 and swings up and down around the shaft 46.

The slider 53 is a shaft having a hexagonal cross section as shown in FIGS. The slider 53 is moved by a guide roller 48 attached to a roller shaft 47.
The surface is pinched, and can be moved only in the vertical direction.
On the other hand, the upper end of the slider 53 is connected to the air supply valve 20 and the exhaust valve 2.
5 is connected to a connecting plate 30 for interlocking. That is, in this embodiment, the snap mechanism 5 is linked to the switching valve by the slider 53.

A coil spring 54 is mounted between the slider 53 and the lever 52 via a male spring receiving member 55 and a female spring receiving member 56. The configuration of this portion is a characteristic configuration of the liquid pressure feeding device 1 of the present embodiment, and will be described in detail with reference to FIG.

First, the male spring receiving member 55 will be described. The male spring receiving member 55 is made of a metal having excellent rust prevention properties such as a copper alloy or stainless steel . 60, boss 61 and sliding shaft 6
2 are integrally formed. The mounting end 60 has a columnar shape, and has a through hole 65 in a direction perpendicular to the axis. The boss portion 61 is continuous with one end of the mounting end portion 60, and forms a taper that becomes thinner as it goes further. The tip of the boss 61 is continuous with the sliding shaft 62. Each of the sliding shaft portions 62 is a round bar having a uniform thickness, and has a length substantially equal to that of the coil spring 54.

On the other hand, the female spring receiving member 56 is made of the same material as the male spring receiving member 55, and has a mounting end 68 and a boss 70 provided continuously. Attachment end 68 of the female spring receiving member 56 is clevis-shaped, and is divided into two crotch, holes 71 penetrating the both are provided. The boss 70 of the female spring receiving member 56 has a gentle taper on the outer peripheral surface, and a sliding hole 73 penetrating in the axial direction at the center.

The sliding shaft portion 62 of the male spring receiving member 55 is inserted into the sliding hole 73 of the female spring receiving member 56, and the boss portion 61 and the sliding shaft portion 62 of the male spring receiving member 55
A continuous shaft center is formed by the boss 70 of the female spring receiving member 56. Here, the diameter of the sliding hole 73 of the female spring receiving member 56 and the diameter of the sliding shaft portion 62 of the male spring receiving member 55 are 2
A difference of about mm is provided, and the fit between the two is extremely loose. Therefore, the sliding shaft portion 62 of the male spring receiving member 55 freely slides in the sliding hole 73 of the female spring receiving member 56.
Therefore, the male spring receiving member 55 slides in the axial direction with respect to a series of shaft cores formed by the bosses 61 and 70 described above.

The coil spring 54 has an inner diameter substantially equal to the bosses 61 and 70 of the spring receiving members 55 and 56, and an outer diameter substantially equal to the mounting end portions 60 and 68 of the spring receiving members 55 and 56.

The coil spring 54 is connected to the spring receiving member 5.
The coil spring 54 is covered with a continuous shaft formed by the bosses 61 and 70 of the fifth and 56, and both ends of the coil spring 54 are in contact with the side surfaces of the mounting ends 60 and 68 of the spring receiving members 55 and 56. The end of the coil spring 54 is
I am tightly hugged at 1,70.

In the liquid pressure feeding device 1 of this embodiment, the above-described coil spring 54 and the like are combined in the form shown in FIG.
Are arranged between the plates 59 formed in the "U" shape of the lever 52 as shown in FIG. The male spring receiving member 55 is located near the groove 58 of the lever 52, and a pin 75 is inserted through the lever 52 and the through hole 65.

On the other hand, the female spring receiving member 56 sandwiches the slider 53 between the forked portions of the mounting end 68, and
A pin 76 is penetrated between 3 and the through hole 71 of the mounting end 68. Therefore, the coil spring 54 is connected between the distal end side of the lever 52 and the slider 53 with a rotating pair. Also, as described above, the spring receiving member 55,
With the 56 connected to the lever 52 and the slider 53, respectively, the coil spring 54, which is sheathed on the axis, is in a compressed state.

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 of the external piping of the liquid pumping device 1 is connected to a steam source,
The working fluid outlet 13 is connected to a steam circulation pipe. The liquid inlet 16 is connected to a vapor load via a check valve (not shown) that opens from the outside toward the liquid storage space 10. On the other hand, the liquid discharge port 17 is connected to a waste heat utilization device via a check valve (not shown) that opens outward from the liquid storage space 10.

The liquid storage space 1 of the liquid pumping apparatus 1 of the present embodiment.
If there is no condensate within 0, the float 3 is down to the bottom. At this time, the snap mechanism 5 is in a state as shown in FIGS. That is, the connecting portion (pin 76) between the coil spring 54 and the slider 53 is lower than the connecting portion (pin 75) between the coil spring 54 and the lever 52. Therefore, the coil spring 54 presses the slider 53 obliquely downward by the reaction force. Therefore, the slider 53 is caused by a vertically downward component of the pressing force of the coil spring 54.
It is pressed downward, comes into contact with a contact portion (not shown), and stops at a certain position. The connecting plate 30 is the slider 5
3 and is drawn toward the liquid storage space 10 by the air supply valve 2.
0 is closed and the exhaust valve 25 is open. Then, when condensed water is generated in the load, the condensed water flows into the liquid pumping device 1 from the liquid inlet 16 and accumulates in the liquid storage space 10.
Then, the float 3 in the liquid storage space 10 floats by condensate.
Up. Here, in the liquid pumping apparatus 1 of the present embodiment, the flow
G3 swings about the axis 40, so the swing radius
Is smaller than the prior art.

When the float 3 rises due to the condensed water collected in the liquid storage space 10, the lever 52 slowly rotates counterclockwise about the shaft 46, and the male spring receiving member 55 gradually lowers. On the other hand, on the female spring receiving member 56 side, since the slider 53 is pressed to the lowermost end by the coil spring 54, the position of the female spring member 56 remains at the initial position and does not move.

Since the spring receiving members 55 and 56 are connected to the lever 52 or the slider 53 by the pins 75 and 76, the spring receiving members 55 and 56 are moved to the pins 75 in accordance with the movement of the male spring receiving member 55. , 76. The important point here is that the liquid pumping apparatus 1 of the present invention is used.
In each of the spring receiving members 55 and 56, the sliding shaft portion 62 is inserted into the sliding hole 73, and the two are integrally formed to form a continuous shaft core. That is, with the movement of the male spring receiving member 55, both the spring receiving members 55 and 56 are forcibly rotated together, and their angles are changed every moment about the pins 75 and 76. Always on the same axis. In addition, all of the moment generated by the movement of the male spring receiving member 55 is loaded on the shaft formed by the two spring receiving members 55 and 56. Therefore, no moment acts on the coil spring 54 provided on the shaft core.

As the lever 52 swings, the pins 75, 76
Interval becomes shorter. The spring receiving members 55 and 56 employed in the liquid pressure feeding device 1 of the present embodiment are such that the sliding shaft portion 62 of the male spring receiving member 55 is inserted into the sliding hole 73 and the male spring receiving member 55 slides. Thus, the total length of the two can be changed. Therefore, the total length of the two spring receiving members 55 and 56 is reduced in accordance with the change in the interval between the pins 75 and 76, the coil spring 54 is further compressed, and compression energy is accumulated in the coil spring 54. As described above, in the liquid pumping apparatus 1 of the present embodiment, when the coil spring 54 is compressed, only the compression force acts on the coil spring 54, and no moment is applied. Therefore, in the liquid pressure feeding device 1 of the present embodiment, when the coil spring 54 is compressed, the ends of the coil spring 54 do not rub against the spring receiving members 55 and 56, and the coil spring 54 does not bend.

When the float 3 further floats, the swing of the lever 52 proceeds, and finally, the coil spring 54 is brought into a vertical state with respect to the slider 53 as shown in FIG.
When the float 3 rises a little more, the lever 5
The joint (pin 75) between the coil spring 2 and the coil spring 54 descends,
Finally, the connecting portion between the lever 52 and the coil spring 54 (pin 7
5) is located below the joint (pin 76) between the slider 53 and the coil spring 54, and the vertical relationship between both ends of the coil spring 54 is reversed. Then, the slider 53 is pressed upward by the pressing force of the coil spring 54. As a result, the slider 53 snaps upward, the connecting plate 30 connected to the slider 53 is pushed in, the air supply valve 20 is opened, and the exhaust valve 25 is closed.

During the series of movements during this period, only the axial compressive force acts on the coil spring 54, and no moment acts on the coil spring 54 at all.

When the working fluid inlet 11 is opened, steam is introduced into the closed vessel 12 and the internal pressure rises, and the condensate collected in the condensate storage space 10 is pushed by the vapor pressure to drain the liquid. It is discharged from the outlet 17 to an external waste heat utilization device. As a result, the water level in the condensate storage space 10 decreases, and the float 3 descends. The snap mechanism 5 follows a path completely opposite to the above, the lever 52 swings clockwise, and the coil spring 54 and the slider 53 again have a right angle positional relationship. Then, the slider 53 snaps in a direction completely opposite to the above.

In the snap operation of the snap mechanism 5 accompanying the lowering of the float 3, the spring receiving members 55 and 56 are always on the same axis as in the previous case, and the coil spring 54 exerts only a compressive force in the axial direction. Only acts, and no moment acts. Therefore, the end of the coil spring 54 may rub against the spring receiving members 55 and 56, or the coil spring 54
Will not bend.

In the liquid pressure feeding device 1 of this embodiment, the lever 52, the slider 53, and the coil spring 5 serve as a snap mechanism.
4 etc. were adopted. The snap mechanism having this configuration is recommended because the repulsive force of the coil spring during the snap operation is large and the operation is reliable.

In the liquid pressure feeding device 1 of the above-described embodiment, the sliding shaft portion 62 of the male spring receiving member 55 is
No. 6 inserted in the sliding hole 73. This configuration is recommended because there is no projection at the ends of both spring receiving members and the entire length can be designed short. However, the present invention is not limited to the configuration of the above embodiment. For example, two spring receiving members provided with through holes are passed through one round bar, and the spring receiving member is slid along the round bar. It is also possible to adopt a configuration in which the control is performed.

[0048]

The liquid pumping apparatus of the present invention has the same structure as the float.
Since it has a lever in addition to the shaft that swings as a body,
It is possible to shorten the funnel shaft itself,
Has a small swing radius and can be downsized. Liquid of the present invention
In body pumping devices, the coil springs are
One end of the coil spring is a spring that slides on the axis.
One end is coupled to the receiving member, and one end is connected through the spring receiving member.
The other end is linked to the switching valve
ing. Therefore, when one end of the coil spring moves in conjunction with the float and the angle of the end changes, the other end is forcibly rotated by the axis centered on the coil spring. Therefore, both ends of the coil spring always face each other when the coil spring moves or snap moves, and the coil spring always deforms only in the expansion and contraction direction while maintaining a linear state. Therefore, the end of the coil spring does not rub against the spring receiving member or the like, and no bending moment is applied to the coil spring. Therefore, the liquid pumping device of the present invention not only has a small outer shape.
In addition, there is an excellent effect that damage to the coil spring is small and durability is high.

[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 view of a main part of FIG.

FIG. 3 is a sectional view of a coil spring and a spring receiving member employed in the liquid pressure feeding device of FIG.

FIG. 4 is a sectional view taken along line AA of FIG. 2;

FIG. 5 is a sectional view taken along line BB of FIG. 2;

FIG. 6 is a view as viewed in the direction of arrow C in FIG. 1;

FIG. 7 is an enlarged view of a main part of FIG. 1 showing a behavior of a snap mechanism employed in the liquid pressure feeding device of the present invention.

FIG. 8 is an enlarged view of a main part of FIG. 1 showing a behavior of a snap mechanism employed in the liquid pressure feeding device of the present invention.

FIG. 9 is a front view of a snap mechanism of the conventional liquid pressure feeding device.

FIG. 10 is an enlarged view of a main part of the snap mechanism showing a behavior of a coil spring of the snap mechanism of the conventional liquid pumping device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 liquid pressure feeding device 2 closed container 3 float 5 snap mechanism 16 liquid inlet 17 liquid outlet 20 air supply valve 25 exhaust valve 52 lever 53 slider 54 coil spring 55 male spring receiving member 56 female spring receiving member 62 sliding shaft 73 sliding Moving hole

Claims (1)

(57) [Claims] A sealed container has a built-in oscillating float having a shaft and a snap mechanism. The sealed container is provided with a switching valve for switching between supply and exhaust of a working fluid, a liquid inlet and a liquid outlet. Is provided, the snap mechanism has a coil spring linked to the switching valve, at least one end of the coil spring is linked to the float, deformed according to the movement of the float, and when the float exceeds a certain position. , the coil spring is restored rapidly deformed, the liquid pumping device for switching the switching valve linked to the coil spring,
The snap mechanism has one end rotatably mounted on the shaft and the other end floating.
Oscillates with the float shaft following the float
Has a lever that, the coil spring is fitted on the axis of the continuous, one end of the coil spring is coupled to the spring receiving member that slides axial one end of the coil spring is coupled with the lever via the spring receiving member And the other end is switched
A liquid pumping device characterized by being linked to a valve .