JP2835677B2 - 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. 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 covered 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:
Often it still has a significant amount of heat. Therefore, in recent years, condensed water recovery systems that collect condensed water and send the condensed water to a boiler or a waste heat utilization device to effectively use the waste heat have been widely used for effective use of energy.

[0003] By the way, the early condensate recovery system was connected directly to the water supply section of the boiler by piping from the discharge port of the steam trap, and conveys the condensate by its own pressure. However, the initial configuration described above is not sufficient when the condensate is sent, in other words, when the pressure on the secondary side of the steam trap is high, or when the condensate is sent far from the steam load. There was a problem that the function could not be exhibited. Therefore, in recent years, condensed water is once collected in a closed container, and a high-pressure working fluid such as steam is introduced into the closed container, and the condensed water in the closed container is forcibly discharged by the pressure of the working fluid. Condensate recovery is often performed using a liquid pumping device. This type of liquid pumping apparatus has a configuration disclosed in, for example, Japanese Utility Model Laid-Open No. 50-147228.

[0004] A conventional liquid pressure feeding device will be described below. FIG. 12 is a partial cross-sectional perspective view of a conventional liquid pumping apparatus. In the figure, reference numeral 100 denotes a conventional liquid pumping apparatus. The liquid pumping apparatus 100 includes a float 120 and a valve of the closed vessel 101 in the closed vessel 101.
It has a built-in mechanism that opens and closes in response to elevating and lowering 20.

[0005] The closed container 101 has a liquid inlet 1 near the bottom.
02 and a liquid discharge port 103 are provided, and check valves 105 and 106 are attached to each of them. Here, the check valve 105 is mounted in a direction that allows the liquid to flow into the closed vessel 101. On the other hand, the check valve 106 is
01 is installed in a direction that allows the liquid to be discharged to the outside.

A working fluid inlet 108 and a working fluid outlet 109 are provided at the top of the closed vessel 101.
A valve 110 and a valve 111 are respectively mounted. Here, the valves 110 and 111 are both operating rods 112 and 113.
The valve 110 opens and closes when the operating rod 112 is raised, and the valve 111 closes when the operating rod 113 is raised. The operating rods 112 and 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 simultaneously opened and closed.

Reference numeral 116 denotes a fixing member,
Are integrally fixed to the inner surface of the. The fixing member 116 is provided with a snap mechanism. FIG.
FIG. 13 is a partially enlarged view of the snap mechanism of FIG. The snap mechanism of the prior art liquid pumping device includes a first lever 118.
And the second lever 119 are fixed to the fixing member 1 by the pin 107.
16 is swingably attached. Each end of the first lever 118 and the second lever 119 is a tension spring 117.
Are joined by The first lever 118 is coupled to the float arm 125 via the elongated hole 124 and the pin 122, and swings up and down following the float 120. One second lever 119 is connected to a rod 123 via a shaft 121, and the rod 123 is further connected to a connecting plate 115.

[0008] The prior art liquid pumping apparatus has a liquid inlet 1
02 is connected to the vapor load via a check valve 105, and the liquid outlet 103 is connected to a waste heat utilization device via a check valve 106. The working fluid inlet 108 is connected to a steam source. In the conventional liquid pumping apparatus 100, the closed container 1
When there is no condensate in 01, the float 120 is at the bottom inside the closed vessel 101. Then, the snap mechanism is stopped with the first lever 118 and the second lever 119 in the shape of a downward “C” as shown by the solid line in FIG. When condensed water is generated in the steam load, the condensed water flows from the check valve 105 into the closed container 101 and accumulates. Then, as the amount of condensed water increases, the float 120 rises, and accordingly, one end of the first lever 118 rises. Then, the first lever 118 is moved to the second lever 119 as indicated by an arrow H.
When the position exceeds the linear position, the tension spring 117 generates a component force in the second lever 119 in the upward direction in the drawing. Therefore, the second lever 119 jumps upward and snaps as shown by the two-dot chain line. And
At this time, the bar 123 is lifted upward by the flipping operation, and the valves 110 and 111 are switched. Then valve 1
Steam is filled in the closed container 101 through 10, and condensed water is discharged from the liquid discharge port 103 by being pushed by the vapor pressure.

In the prior art liquid pumping apparatus, energy is stored in a tension spring, and this energy is released at a stretch to perform a snap operation. The energy dissipated at the time of the snap operation in the conventional liquid pumping device, in other words, the displacement amount of the tension spring immediately before the snap operation is performed,
As shown in FIG. FIG. 14 is an explanatory diagram illustrating a trajectory of a tension spring in a conventional liquid pumping device up to a snap movement. 14, the same members as those shown in FIGS. 12 and 13 are denoted by the same reference numerals.

According to the prior art, when the float 120 is at the bottom, the first lever 118 and the second lever 9 are in a downward "C" shape, and the extension spring 117 is connected to the J, K in FIG. Between. Then, with the rise of the float 120, the end on the first lever 118 side is moved to the first lever 118.
It moves with the swing locus of. Then, the first lever 11
Snap movement occurs at a point 8 and a point L where the second lever 119 is linearly arranged. Therefore, the tension spring 117 is (LJ
−KJ). The tension spring 11 at this time
The change rate of the length of 7 is (LJ-KJ) / KJ.

[0011]

In the prior art liquid pumping apparatus 100, the valves 110 and 111 are opened and closed by snap-moving the second lever 119, so that the switching of the valves is performed relatively reliably. However, the conventional liquid pumping apparatus 100 requires two levers, a first lever 118 and a second lever 119, in addition to the float arm 125, and has a drawback that the number of parts is large and the structure is complicated. Was.

Further, since the conventional liquid pressure feeding device 100 requires two levers as described above, the number of fulcrums of each lever is large and the resistance due to the frictional force of each fulcrum is large. Therefore, the conventional liquid pumping apparatus 100
Has a problem that lacks smoothness of operation. Further, the liquid pumping apparatus 100 of the related art requires a large buoyancy in order to oppose a large frictional resistance generated from each fulcrum, and there is a problem that the outer shape is inevitably increased.

Further, the liquid pumping apparatus 100 according to the prior art includes:
There was a problem that the force at the time of the snap operation was not sufficient.
In other words, the liquid pumping device 100 of the related art is not satisfactory in the amount of energy stored in the tension spring, and leaves room for improvement.

In addition, in the liquid feeding apparatus of the prior art, the movement trajectory of the tension spring 117 when the second lever 119 snaps moves passes through the pin 107 which is the swing center of the first lever 118 and the second lever 119. For this reason, the spring may be caught on the pin 107 while the extension spring 117 moves, and the opening and closing of the valve may not be performed. By the way, in this type of liquid pumping device, the second lever 119 snaps to open the valve, and condensate is discharged only after the sealed container is filled with steam. Therefore, if the tension spring 117 is hooked on the pin 107 as described above,
The float 120 does not drop and does not return to its original state. Therefore, once the tension spring 117
If it is caught on 07, it will be completely in a failure state.

In order to prevent such a situation, a device for mounting the tension spring 117 as far away from the pin 107 as possible has been devised. However, since the tension spring 117 moves horizontally independently of the lever as described above, the spring 11
7 itself vibrates largely in the horizontal direction. The tension spring 117 may be hooked on the pin 107 during the vibration. Therefore, according to the configuration of the related art, it is difficult to completely prevent a failure in which the tension spring 117 is caught on the pin 107.

The liquid pumping apparatus of the present invention focuses on the above-mentioned drawbacks of the prior art, reduces the number of parts, simplifies the structure, and opens and closes the working fluid inlet and the like with a strong force. It is an object of the present invention to provide a liquid pumping device which can be operated smoothly and has few troubles.

[0017]

A feature of the present invention to achieve 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 a working fluid inlet and a working fluid outlet in response to lifting and lowering of a float, and pumps liquid accumulated in the sealed container from the liquid outlet to the outside, , A main lever that swings in response to lifting and lowering of the float, a slider that performs linear motion in the sealed container, and a compression spring, and the compression spring is capable of pressing the main lever through a rotation fulcrum. It is connected to the main lever and slider,
The liquid pumping device is characterized in that the slider snaps in response to the lifting and lowering of the float, and at least one of the working fluid inlet and the working fluid outlet is opened and closed by the snapping.

Another invention for achieving the same object is a modification of the above-mentioned invention, in which the compression spring is attached to the main lever in a state where the main lever can be pulled by the compression spring. is there.

[0019]

In the liquid pumping apparatus of the present invention, when there is no liquid in the closed container, the float is lowered and the main lever is at the initial position, as in the prior art. At this time, the compression spring connected to the main lever is oblique to the axial direction of the slider, and the compression spring presses the slider in one direction by the component of the compression force in the slider axial direction.
The slider comes into contact with the valve and other contact members and stops at a certain position. When the slider is at the position, the working fluid inlet is closed by the action of the slider.

When the liquid flows into the closed container, the float rises due to the liquid, and the main lever swings away from the initial position. Further, as the main lever swings, the joint of the compression spring and the main lever moves. Then, by moving the coupling portion of the compression spring with the main lever, the compression spring has a positional relationship perpendicular to the axial direction of the slider. When the connecting portion of the compression spring further moves, the direction of the compression spring changes to an oblique position opposite to the slider in the initial state. Therefore, the compression spring presses the slider in a direction opposite to the initial pressing direction of the slider.
As a result, the slider snaps and moves to a position opposite to the initial state.

Next, the amount of compression of the compression spring in the above-described series of operations will be described for individual cases. FIG.
0 is an explanatory diagram illustrating a compression trajectory of the compression spring according to the first aspect of the present invention. In FIG. 10, 1 represents a float. For ease of explanation, it is assumed that the float 1 is directly attached to the main lever 2. The main lever 2 is swingably supported at a fulcrum 3. Reference numeral 4 denotes a slider that linearly moves in the direction of the double arrow. The compression spring 5 is represented by a solid line, and connects the main lever 2 and the slider 4 at both ends of the fulcrum. In the configuration of FIG. 10, since the swing fulcrum 3 of the main lever 2 is located in the order of the slider 4, the compression spring 5, and the swing fulcrum 3 from one side, the main lever 2 is in a state of being pressed by the compression spring 5.

In FIG. 10, the range of movement of the end of the main lever 2 is illustrated in the same manner as in FIG. 14 in order to facilitate comparison with the prior art. The positional relationship between the end of the main lever 2 and the slider 4 is represented by disposing the slider 4 at a position passing through the pin 107 in FIG. According to the first aspect of the present invention, when the float 1 is at the bottom, the end of the compression spring 5 on the main lever side is at the position A, and the end on the slider side is at the position B. Then, since the slider 4 snaps when the float 1 rises and the compression spring 5 becomes perpendicular to the slider 4, the end of the compression spring immediately before the slider 4 snaps on the main lever side. The part is the position of C. That is, according to the first aspect of the present invention, the compression spring is contracted by (AB-CB). At this time, the change rate of the length of the compression spring is (AB-CB) / AB
It can be seen that the energy changes much more than in the case of the prior art, and that a large amount of energy can be stored. Claim 1
In the described invention, the movement trajectory of the compression spring does not pass through the swing fulcrum of the main lever.

According to the first aspect of the present invention, the float can be directly attached to the main lever, and the snap mechanism can be made with a very simple structure. However, on the other hand, looking at the trajectory of the end of the compression spring 5 according to the first aspect of the present invention, as the swing of the main lever 2 progresses, the compression spring 5 approaches the connecting portion B on the slider 4 side, and at a certain point. And move away from slider 4 at the border. Therefore, claim 1
In the described invention, the state of the compression spring immediately before the snap operation occurs is often not the most contracted state in the compression trajectory of the compression spring. More specifically, referring to the configuration of FIG. 10, the compression spring 5 is compressed from point A to point C, but the compression spring 5 is most compressed at point D in the middle. Therefore, in the invention described in claim 1,
It is necessary to apply a force that does not contribute to the snap operation to the compression spring, which wastes the force.

When the trajectory of the compression spring according to the first aspect of the present invention is analyzed in more detail, the compression amount of the spring at the initial stage when the float 1 starts rising is extremely large. By the way, in this type of liquid pumping device, when the float 1 is at the bottom,
Float 1 is completely stationary. Therefore, immediately before the float 1 starts to float, the maximum static frictional force acts on each fulcrum of the device, and a larger buoyancy is required as compared with the middle of the float. From this viewpoint, looking at the trajectory of the compression spring according to the first aspect of the present invention, the invention according to the first aspect requires a sudden spring compression force when the maximum static friction force is applied to the fulcrum. And For this reason, the invention described in claim 1 may lack initial smoothness.

The invention of claim 2 focuses on the above problem,
The invention of claim 1 is further developed to improve the smoothness of the initial operation. FIG. 11 is an explanatory diagram illustrating a compression locus of a compression spring according to the first aspect of the present invention. FIG.
In the configuration of FIG. 1, the same members as those in FIG. 10 described above are denoted by the same reference numerals with “′” and the description is omitted. In the configuration shown in FIG. 11, the pivot 3 'of the main lever 2' is located behind the slider 4 '. Therefore, the main lever 2 'receives a pulling force by the compression spring 5'.

In the configuration shown in FIG. 11, the float 1 'is
The float arm 6 is attached to the float arm 6.
Is connected to the main lever 2 ′ via a long hole or the like.

According to the second aspect of the present invention, the end of the compression spring 5 'moves from A' to C 'with the swing of the main lever 2'. During this time, the compression spring 5 'is always contracted little by little, and the position of C' is in the contracted state most. Therefore, in the invention of claim 2, it is not necessary to excessively compress the compression spring 5 '. In addition, according to the second aspect of the present invention, the compression amount of the compression spring 5 'is small at the initial stage of floating of the float 1'.
Therefore, the operation of the float 1 'at the initial stage of floating is extremely smooth.

[0028]

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 cross-sectional view taken along line MM of FIG. FIG. 3 is an enlarged cross-sectional view taken along line NN of FIG. FIG.
FIG. 2 is a detailed sectional view of a mounting portion of a compression spring and a slider of the liquid pumping device of FIG. 1. FIG. 5 is a detailed view of a snap mechanism employed in the liquid pressure feeding device of FIG. 1 and shows a case where there is no condensate in the closed container. FIG. 6 is a detailed view of a snap mechanism employed in the liquid pressure feeding device of FIG. 1 and shows a state immediately before snap movement occurs. FIG. 7 is a detailed view of a snap mechanism employed in the liquid pressure feeding device of FIG. 1, and shows a state immediately after snap movement has occurred.

In FIG. 1, reference numeral 10 denotes a liquid pumping apparatus according to a specific embodiment of the present invention. Liquid pumping device 10 of the present embodiment
Has a float 13 and a snap mechanism 15 arranged in a closed container 12.

In this embodiment, the sealed container 12 is of a horizontal type, in which a main body 18 and a lid 19 are connected by a flange 20 and a liquid storage space 21 is formed therein. is there. In the present embodiment, the main body 18 of the closed container 12 is a simple container, and the characteristic components of the present embodiment are generally provided on the lid 19 of the closed container 12. That is, the lid 19 is provided with four openings, specifically, a working fluid inlet 22, a working fluid outlet 23, a liquid inlet 25, and a liquid outlet 26.

Working fluid inlet 22 and working fluid outlet 23
Are arranged horizontally at the position corresponding to the top, in other words, on the side surface of the flange 20 in a state where the closed container 12 is placed horizontally. Further, an air supply valve 28 is built in the working fluid inlet 22 as shown in FIG. The air supply valve 28 closes the working fluid inlet 22 by pulling the shaft 29 toward the inside of the closed container 12 so that the valve body 31 contacts the valve seat 33.

On the other hand, an exhaust valve 35 is disposed in the working fluid guide / outlet 23. The exhaust valve 35 is the above-described supply valve 2
8, the valve body 37 abuts the valve seat 39 and closes the working fluid discharge port 23 by pushing the shaft 36 toward the working fluid discharge port 23.
In the liquid pressure feeding device 10 of the present embodiment, the shafts 29 and 36 of the supply valve 28 and the exhaust valve 35 are connected by the connecting plate 27. Therefore, by moving the connecting plate 27 up and down, one of the air supply valve 28 and the exhaust valve 35 is opened and the other is closed.

The liquid inlet 25 is located at the center of the lid 19.

The liquid discharge port 26 is provided at a position corresponding to the lower part in a state where the closed container 12 is placed horizontally. A double-seat valve (not shown) is provided on the liquid discharge space 26 side of the liquid storage space 21. Here, the double-seat valve has openings on the upper and lower surfaces of a main body having a closed space connected to the liquid discharge port 26, and two valve bodies abut against openings on the upper and lower surfaces. In the double-seat valve employed in this embodiment, when the valve shaft of the valve body is lowered, both of the two valves abut and close the valve seats provided at the openings on the upper and lower surfaces of the main body, respectively. And shut off the outside. On the other hand, when the valve shaft is lifted, the valve leaves the valve seat, the liquid outlet 26 and the liquid storage space 21 communicate with each other, and the bottom portion in the closed container 12 and the outside communicate with each other through the liquid outlet 26.

An important point in the present embodiment lies in the configuration of the snap mechanism 15. The snap mechanism 15 is supported in the closed container 12 by a mounting bracket 50 integrally mounted on the lid 19 of the closed container 12.
First, the shape of the mounting bracket 50 will be described. As shown in FIG.
1, both of which are provided with an appropriate gap and are fixed to the lid 19 by screws 53.

As shown in FIG. 5, a shaft 52 serving as a swing fulcrum and shafts 55 and 56 serving as upper and lower stoppers are stretched between the plate members 51 of the mounting bracket 50 as shown in FIG. The plate-like member 5 of the mounting bracket 50
The four roller shafts 57, 58, 59, 60 are stretched between 1. Roller shafts 57, 58, 59, 60
In each of the examples, a guide roller 61 is attached at an intermediate position so as to be able to idle. The guide roller 61 is provided with flanges 48 at both ends of a roller body 64 as shown in FIG. The roller shafts 57, 58, 59, and 60 have a pair of roller shafts 57 and 58, and a pair of roller shafts 59 and 60, respectively. The pair of roller shafts are mounted side by side in the vertical direction.

The main structure of the snap mechanism 15 employed in the present embodiment comprises a main lever 63, a slider 65, and a compression spring 66.

To explain sequentially, in this embodiment, the main lever 63 has an extended float arm for supporting the float 13. And the main lever 63
A portion slightly closer to the center from the end is supported by a shaft 52 spanned between the two plate-like members 51 of the mounting bracket 50, and can swing about the shaft 52. Further, since the shafts 55 and 56 are suspended above and below the main lever 63, the main lever 63 can swing only within a certain range.

The slider 65 is a shaft having a slide portion 54 at the center as shown in FIG. 5 and screw portions 49 and 67 provided at both ends. The slide portion 54 of the slider 65 has a square cross section. The slider 65 is a roller shaft 57
And 58, and guides attached to 59 and 60
The four surfaces of the roller 61 are sandwiched between the roller body 64 and the collar 48, and can be moved only in the vertical direction. On the other hand, a screw portion 49 on the upper side of the slider 65 is connected to the connecting plate 27 that links the air supply valve 28 and the exhaust valve 35. The screw portion 67 on the lower side of the slider 65 is connected to a valve shaft of a double seat valve (not shown).

The compression spring 66 has a spring support member 69.70.
Are fixed at both ends thereof, and both ends are respectively connected to the end of the main lever 63 and the slide portion 54 of the slider 65. Main lever 63 of spring support members 69, 70
And the connection to the slider 65,
72, both of which are rotatable. FIG. 4 illustrates only the coupling structure on the spring support member 70 side.

Next, the operation of the liquid pumping apparatus 10 of this embodiment will be described by following a series of operation procedures using steam as a working fluid. First, the external piping of the liquid pumping device 10 is exactly the same as that of the prior art, the working fluid inlet 22 is connected to the steam source, and the working fluid outlet 23
Is connected to a steam circulation pipe. The liquid inlet 25
Is a check valve 68 which opens toward the liquid storage space 21 from outside.
Connected to a load of steam. On the other hand, liquid outlet 26
Is a check valve 73 that opens from the liquid storage space 21 to the outside.
Is connected to the waste heat utilization device via

When there is no condensate in the liquid storage space 21 of the liquid pressure feeding device 10 of this embodiment, the float 13 is lowered to the bottom. At this time, the snap mechanism 15 is in a state as shown in FIG. That is, the float 13 side of the main lever 63 is downward, and the joint with the compression spring 66 at the rear end is located above the shaft 52 with the shaft 52 as a fulcrum. The compression spring 66 presses the end of the main lever 63 toward the shaft 52. At the same time, the compression spring 66 presses the slider 65 obliquely downward by the reaction force. For this reason, the slider 65 is pressed downward by the vertically downward component of the pressing force of the compression spring 66, comes into contact with a contact portion (not shown), and stops at a fixed position. The connecting plate 27 is pulled toward the liquid storage space 21 by the slider 65, the working fluid inlet 22 is closed, and the working fluid outlet 23 is opened.

In a double seat valve (not shown), the slider 6
5, the valve shaft is pushed, and the liquid outlet 26 is closed. Accordingly, the liquid storage space 21 is affected by high-pressure steam,
Not affected by the pressure on the secondary side of the liquid pumping device 10,
It is the same as the pressure in the load. Therefore, when condensate occurs in the load, the condensate flows from the liquid inlet 25 into the liquid pumping device 10 and accumulates in the liquid storage space 21.

Then, the float 13 floats due to the condensed water collected in the liquid storage space 21. And the main lever 63
5 slowly rotates about the shaft 52 in the direction of the arrow P in FIG. 5, and the coupling portion with the compression spring 66 gradually lowers. Therefore, the compression spring 66 is further compressed, and the compression energy is stored.

When the float 13 further floats, the swing of the main lever 63 proceeds, and finally, the compression spring 66 becomes vertical to the slider 65 as shown in FIG. When the float 3 is further raised slightly, the connecting portion between the main lever 63 and the compression spring 66 is lowered, and finally the connecting portion between the main lever 63 and the compression spring 66 is moved to the slider 65.
The compression spring 66 is located below the connection portion, and the vertical relationship between both ends of the compression spring 66 is reversed. Then,
The slider 65 is pressed upward by the pressing force of the compression spring 66. As a result, the slider 65 snaps upward, the connecting plate 27 connected to the slider 65 is pushed in, the working fluid inlet 22 is opened, and the working fluid outlet 23 is closed. In the liquid pressure feeding device 10 according to the present embodiment, the shaft 52 serving as the swing fulcrum of the main lever 63 is located at a position completely separated from the compression spring 66, so that the compression spring 66 moves with the snap movement of the slider 65. At this time, there is no possibility that the compression spring 66 is hooked on the shaft 52.

When the working fluid inlet 22 is opened, steam is introduced into the closed container 12, and the internal pressure increases.
At this time, the valve shaft of the double seat valve (not shown) interlocked with the slider 65 is pushed down, and the double seat valve is open. Therefore, the condensed water stored in the condensate storage space 21 is pushed by the vapor pressure and discharged from the liquid discharge port 26 to an external waste heat utilization device.
As a result, the water level in the condensate storage space 21 decreases, and the float 13 descends. The snap mechanism 15 follows a completely reverse path, and the main lever 63 swings in the Q direction in FIG.
The compression spring 66 and the slider 65 again have a right angle positional relationship. Then, the slider 65 snaps in a direction completely opposite to the above.

In the above embodiment, the float 13 was directly attached to the main lever 63. The configuration in which the float 13 is directly attached to the main lever 63 in this way is a configuration in which the number of components is small, the assembly is simple, and the configuration is recommended. But,
According to the above configuration, there is a disadvantage that the pressing force of the compression spring is directly applied to the swing shaft of the main lever. Therefore, the float is attached to a member such as the float arm, and the float arm and the main lever are linked by some means. Accordingly, a configuration in which the load applied to the swing shaft of the main lever is reduced is also useful.

In the above embodiment, the swing fulcrum of the main lever,
The configuration in which the slider, the compression spring, and the connecting portion of the main lever and the compression spring are arranged in this order, a compression force toward the swing fulcrum is applied to the main lever, and the slider is pressed by the reaction force. Next, a configuration will be described in which the swing fulcrum of the main lever is arranged at a position before the slider, a pulling force is applied to the main lever from the swing fulcrum toward the other, and the slider is pressed by the reaction force. In the embodiments described below, the same reference numerals are given to members that perform the same operations as in the previous embodiment, and redundant description will be avoided.

FIG. 8 is a sectional view of a liquid pumping apparatus according to a specific embodiment of the present invention. FIG. 9 is a detailed view of a snap mechanism employed in the liquid pressure feeding device of FIG. 1 and shows a case where there is no condensate in the closed container. The difference between the liquid pumping device 80 of the present embodiment and the previous embodiment is that the liquid pumping device 80 of the present embodiment
The main lever 81 employs a member different from the float arm 82. That is, the main lever 81
The slider 65 in FIG. 8 is supported by a shaft 83 at a position near the liquid inlet 25 side, and swings using the shaft 83 as a swing fulcrum. The compression spring 66 is connected to the main lever 8.
1 is connected to the other end. Therefore, the main lever 81 receives a force in the tension direction by the compression spring 66.

The connection between the compression spring 66 and the main lever 81 is connected to the float arm 82. The float arm 82 and the main lever 81 are connected to the long hole 85 provided at the end of the float arm 82 by the compression spring 6.
This is done by inserting a pin 86 that is connected to the sixth and the like without substantial play.

The operation of the liquid pressure feeding device 80 of this embodiment is almost the same as that of the above-described embodiment. That is, when the float 13 floats, the float arm 82
, And the end of the float arm 82, that is, the portion of the long hole 85 descends. Then, the pin 86 fitted in the long hole 85 is lowered, and the main lever 81 swings in the direction of the arrow R accordingly. Then, the compression spring 66 is contracted.
Here, the operation to be particularly noted in the liquid pressure feeding device 80 of the present embodiment is that the compression spring 66 with respect to the descending amount of the float arm 82 immediately before the float 13 starts floating from the rest position.
Is a small compression amount. Therefore, just before the float 13 starts floating from the rest position, that is, the snap mechanism 15
The resistance of the compression spring 66 when each rotation fulcrum shifts from the maximum static friction state to the dynamic friction state is small.

Then, the main lever 81 further swings, and eventually reaches a limit position of the snap movement, that is, a state where the compression spring 66 is perpendicular to the slider 65. What should be particularly noted here is that in the liquid pressure feeding device 80 of the present embodiment, the limit position of the snap movement is the smallest position among the swing trajectories of the compression spring 66 so far. Therefore, in the liquid pressure feeding device 80 of the present embodiment, when compressing the compression spring 66, no unnecessary force is required, and the slider 65 can be pressed with a strong force.

When the compression spring 66 slightly exceeds the state of being perpendicular to the slider 65, the compression spring 66
Changes the direction of the force pressing the slider 65. As a result, the slider 65 snaps upward and the working fluid inlet 22 is opened and the working fluid outlet 2
3 is closed.

In the liquid pressure feeding device 80 of this embodiment, the pivot of the main lever 81 is connected to the liquid inlet 2 of the slider 65.
The main lever 81 can be urged in the tension direction by a compression spring even if the swing fulcrum is attached to the position of the slider or a position closer to the float arm than the slider.

The liquid pressure feeding devices 10 and 8 of the embodiment described above.
In the case of 0, all the sliders move in the vertical direction. However, the present invention does not limit the moving direction of the slider at all, and may be adjusted according to the shape of the closed container 2 and the arrangement of the working fluid inlet. It can be changed arbitrarily.

[0056]

The liquid pressure feeding device of the present invention is a series of mechanisms constituted by a main lever, a slider and a compression spring.
Snap operation is performed, and the compression spring connected to the slider is compressed by the swing of the main lever,
There is an effect that the compression ratio of the compression spring is large with respect to the constant movement amount of the main lever. Therefore, the liquid pressure feeding device of the present invention has an effect that the resilience of the compression spring during the snap operation is large and the operation is reliable.

Further, the snap mechanism of the liquid pressure feeding device of the present invention basically comprises three members of a main lever, a slider, and a compression spring. Further, the snap mechanism employed in the liquid pumping device of the present invention has the effects of having a small number of fulcrums, a small loss of force due to frictional force, and a smooth operation.

In addition, according to the first aspect of the present invention, since the trajectory of the compression spring during the snap operation does not pass through the pivot axis of the main lever, there is no fear that the compression spring will be caught on the shaft during the snap operation, and there are few failures. effective.

According to the second aspect of the present invention, the trajectory when the compression spring is compressed is ideal in terms of the characteristics of the liquid pressure feeding device, and has an effect that the operation is smooth.

[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 cross-sectional view taken along line MM of FIG.

FIG. 3 is an enlarged cross-sectional view taken along the line NN of FIG. 1;

FIG. 4 is a detailed cross-sectional view of a mounting portion of a compression spring and a slider of the liquid pressure feeding device of FIG. 1;

FIG. 5 is a detailed view of a snap mechanism employed in the liquid pressure feeding device of FIG. 1, showing a case where there is no condensate in a closed container.

FIG. 6 is a detailed view of a snap mechanism employed in the liquid pressure feeding device of FIG. 1, showing a state immediately before snap movement occurs.

FIG. 7 is a detailed view of a snap mechanism employed in the liquid pressure feeding device of FIG. 1, showing a state immediately after snap movement has occurred.

FIG. 8 is a sectional view of a liquid pumping device according to a specific embodiment of the present invention.

FIG. 9 is a detailed view of a snap mechanism employed in the liquid pressure feeding device of FIG. 1;

FIG. 10 is an explanatory diagram illustrating a compression locus of a compression spring according to the first aspect of the present invention.

FIG. 11 is an explanatory diagram illustrating a compression trajectory of a compression spring according to the first aspect of the invention.

FIG. 12 is a partial cross-sectional perspective view of a conventional liquid pumping device.

FIG. 13 is a partially enlarged view of the snap mechanism of FIG.

FIG. 14 is an explanatory diagram illustrating a trajectory up to snap movement of a tension spring in a conventional liquid pressure feeding device.

[Explanation of symbols]

 1, 1 'float 2, 2' main lever 3, 3 'swing fulcrum 4, 4' slider 10, 80 liquid pumping device 12 closed vessel 13 float 15 snap mechanism 22 working fluid inlet 23 working fluid outlet 25 liquid flow Inlet 26 Liquid outlet 50 Mounting bracket 52, 83 Shaft (oscillation fulcrum) 61 Guide roller 63, 81 Main lever 65 Slider 66 Compression spring 82 Float arm

Claims (2)

(57) [Claims] 1. A float is disposed in a closed 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 in accordance with rising and lowering of the float. In a liquid pumping device that opens and closes one of them and pumps the liquid accumulated in the closed container to the outside from a liquid discharge port, a main lever supported in the closed container and swinging in response to lifting and lowering of the float; And a compression spring.The compression spring is coupled to the main lever and the slider via a rotation fulcrum in a state where the main lever can be pressed, and the slider snaps according to the rise and fall of the float. A liquid pumping device which moves, and opens and closes at least one of a working fluid inlet and a working fluid outlet by the snap movement. 2. A float is disposed in a closed 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 in accordance with 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 supported in the closed container and swinging in response to lifting and lowering of the float; And a compression spring.The compression spring is coupled to the main lever and the slider via a rotation fulcrum in a state where the main lever can be pulled, and the slider snaps according to the rise and fall of the float. A liquid pumping device which moves, and opens and closes at least one of a working fluid inlet and a working fluid outlet by the snap movement.