JP3414533B2 - Liquid pumping device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid pumping apparatus for pumping a liquid such as water or fuel. The liquid pressure feeding device of the present invention is particularly suitable as a device for once collecting condensed water generated in a steam piping system and sending the condensed water to a boiler or a waste heat utilization device. [0002] Condensate generated by condensation in a steam piping system is:
It often still has a considerable amount of heat, so condensed water is collected using a liquid pumping device for effective use of energy, and this condensed water is sent to a boiler or waste heat utilization device to waste heat. Condensate recovery systems that make effective use of water are widely used. [0003] A liquid pressure feeding device used in a condensate recovery system collects condensed water in a closed container, and switches a switching valve to introduce a high-pressure working fluid such as steam into the closed container. The condensate in the closed vessel is forcibly discharged by the pressure of the fluid. Therefore, in order to operate the liquid pumping device with high efficiency, it is necessary to store as much condensed water as possible in a closed vessel and to switch the switching valve reliably. Therefore, in the liquid pressure feeding device, a snap mechanism using a coil spring is generally adopted, and the switching of the switching valve has been surely performed. 2. Description of the Related Art An example of a liquid pumping device including a snap mechanism using a coil spring includes a configuration disclosed in US Pat. No. 5,141,405. FIG. 2 is a front view of a snap mechanism of a conventional liquid pressure feeding device. The above-mentioned U.S. Pat.
In the liquid pumping device disclosed in Japanese Patent Application Publication No.
Is constituted by a float arm 101, a sub arm 102 and a coil spring 103 in a compressed state. The float arm 101 is supported by a pin 106 with respect to the support member 105.
Is fixed to be swingable by the
Is attached. [0006] One end of the sub arm 102 is connected to the support member 105 by the same pin 106 as the float arm 101,
The other end is connected to one end of the coil spring 103 by a pin 110 via a spring receiving member 116. Secondary arm 1
A valve shaft operating rod 111 is connected to an intermediate portion of the valve 02 by a pin 107. The valve stem operating rod 111 is connected to a switching valve (not shown), and the snap mechanism 100 is linked to the switching valve via the valve stem operating rod 111. The other end of the coil spring 103 in FIG. 2 is connected to the float arm 101 by a pin 112 via a spring receiving member 115. In the prior art liquid pumping apparatus, when condensed water is collected in a closed container (not shown), the float 108 floats, and the spring receiving member 115 side of the coil spring 103 moves upward in conjunction with the float 108 floating. Then, the coil spring 103 is compressed and deformed. Then, the float 108 further rises, and the coil spring 103 and the sub arm 102 are arranged in a straight line. The float 108 still rises, and the angle between the coil spring 103 and the sub arm 102 becomes 18.
When the angle exceeds 0 degrees, the coil spring 103 rapidly recovers from the deformation, and the connecting portion (pin 110) between the coil spring 103 and the sub arm 102 snaps downward. As a result, the valve shaft operating rod 111 connected to the sub arm moves downward, and the switching valve (not shown) is rapidly switched. [0008] The prior art liquid pumping apparatus 100 is capable of relatively efficiently pumping liquid with a simple structure, but only reliably switches the switching valve. There was a problem that a large buoyancy, that is, a large float was required to obtain the power. This is because, in the liquid pumping apparatus 100 of the related art, the pin 106 and the pin 110 and the pin
The distance between the pin 106 and the pin 112 is longer than the distance between the pin 106 and the pin 110, that is, since the distance between the pin 106 and the pin 112 is longer, This is because the buoyancy expansion ratio is small. Further, since the distance between the pin 106 and the pin 110 is short, the auxiliary arm 10 transmitting to the valve shaft
This is because the enlargement ratio by 2 is also small. Further, the conventional liquid feeding apparatus 100 has a problem that the coil spring 103 is easily buckled. That is, when the coil spring 103 is deformed in conjunction with the float 108, the spring receiving members 115 and 116 swing about the pins 112 and 110, respectively. However, since the pins 112 and 110 are constantly receiving the pressing force by the coil spring 103, the rotation of the spring receiving members 115 and 116 lacks smoothness, the axes of the spring receiving members 115 and 116 are shifted, and the coil spring 103 is set to “S”. This is because it is curved in a "" shape. The present invention pays attention to the above-mentioned problems of the prior art, and switches the switching valve with a strong force even with a small buoyancy to ensure the operation and prevent the coil spring from being damaged, thereby providing a failure. It is an object of the present invention to provide a liquid pumping device with less pressure. [0011] The features of the present invention are as follows.
A float, a switching valve, and a snap mechanism are built in a sealed container having a working fluid inlet, a working fluid outlet, a pumping liquid inlet, and a pumping liquid outlet, and the snap mechanism is supported in the sealed container. A first axis, a float arm and a first sub-arm rotating about the first axis;
A second axis supported by the float arm at a point away from the first axis and parallel to the first axis, and supported by the first sub-arm at a point away from the first axis. And a third axis parallel to the first axis, and mounted between the second and third axes so that both mounting portions are rotatable, and the second axis is oriented in the third axial direction. 2nd guide to move to
A sub-arm and a compression coil spring mounted between the second and third shafts, wherein a distance between the first and third shafts is greater than the distance between the first and second shafts; Liquid pressure feeding is formed longer than the distance between the shafts, the float is connected to the float arm, and the switching valve is connected to the first sub-arm via a valve shaft operating rod. In the device. In the liquid pumping apparatus of the present invention, the coil spring snaps in response to the movement of the float, and the switching valve is switched to pump the liquid stored in the closed container in the same manner as the conventionally known liquid pumping apparatus. . That is, when condensed water accumulates in the closed container, the float floats up, and the float arm rotates around the first axis in conjunction with the floating of the float. This floater
The rotation of the arm causes the coil spring and the second axis, which is the second sub-arm connecting portion, to approach the line connecting the first axis and the third axis while moving in the third axial direction, and the coil spring is compressed and deformed. .
Then, the float rises further, the second axis is aligned on the line connecting the first axis and the third axis, and the float still rises, and the second axis becomes the first axis and the third axis. When the coil spring crosses the line connecting the first and second axes, the coil spring rapidly recovers from deformation, and the third axis snaps to the opposite side to the initial line with respect to the line connecting the first axis and the second axis. As a result, the first sub-arm rotates about the first axis, the valve stem operating rod connected to the first sub-arm moves, and the switching valve is rapidly switched. The snap mechanism employed in the liquid pressure feeding device of the present invention is such that the distance between the first axis and the third axis is longer than the distance between the first axis and the second axis. That is, in the triangle formed by the first axis, the second axis, and the third axis, the distance between the first axis and the second axis is short,
Since the distance between the third shaft and the third shaft is long, the expansion ratio of the buoyancy by the float arm transmitted to the first sub arm is increased, and the first sub shaft transmitted to the valve shaft operating rod is increased. The expansion ratio by the arm also increases. Therefore, the switching valve can be switched with a strong force even with a small buoyancy, that is, a small float. The snap mechanism employed in the liquid pressure feeding device of the present invention is such that a coil spring is provided by a third shaft supported by a first sub arm and a second sub arm supported by a float arm. It is mounted between a second shaft movably guided in a third axial direction. Therefore, the coil spring
When it is deformed in conjunction with the float, it is deformed in the third axial direction, that is, only in the direction of expansion and contraction. Therefore, damage to the coil spring can be prevented. Embodiments Hereinafter, specific embodiments 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. In FIG. 1, a liquid pressure feeding device 1 of the present embodiment is shown.
In the figure, a float 3, a switching valve 4, and a snap mechanism 5 are arranged in a closed container 2. To be described one by one, the closed container 2 comprises a main body 7
And the lid portion 8 are connected by screws (not shown), and a liquid storage space 10 is formed therein. In the present embodiment, the main body 7 of the closed container 2 is a mere container, and the characteristic components of the present embodiment are generally provided on the lid 8 of the closed container 2. That is, the lid 8 is provided with four openings, specifically, a working fluid inlet 11, a working fluid outlet 13, a pumping liquid inlet 16, and a pumping liquid outlet 17. An air supply valve 20 is mounted inside the working fluid inlet 11, in other words, inside the sealed container 2, and an exhaust valve 21 is mounted inside the working fluid outlet 13. Here, the air supply valve 20 is constituted by a valve case 22, a valve body 23, and a lifting rod 24. The valve case 22 has a through hole in the axial direction, and the upper end surface of the through hole functions as a valve seat 25. In the middle part of the valve case 22, there are provided four openings 26 for communicating the aforementioned through holes with the outside. The valve element 23 has a hemispherical shape, and is integrally attached to the tip of the lifting rod 24. In the liquid pressure feeding device 1 of the present embodiment, the air supply valve 2
The leading end of the zero valve case 22 is screwed into the working fluid inlet 11. And the valve body 23 is the working fluid inlet 1
On one side, the lifting rod 24 passes through the through hole of the valve case 22 to the closed container 2 side, and comes into contact with the continuous plate 27. The connecting plate 27 is connected to the valve shaft operating rod 28. Further, the valve shaft operating rod 28 is connected to the snap mechanism 5. The exhaust valve 21 includes a valve case 29, a valve body 30, and a lifting rod 31. The valve case 29 has a through hole in the axial direction, and a valve seat 32 is provided in the through hole. It opens and closes. Note that the valve shaft operating rod 28 and the elevating rod 31 are connected by a pin 33. The switching valve 4 is constituted by the air supply valve 20 and the exhaust valve 21. The exhaust valve 21 is closed when the air supply valve 20 is opened, and the exhaust valve 21 is opened when the air supply valve 20 is closed. The pumping liquid inlet 16 is located substantially at the center of the lid 8, and the pumping liquid outlet 17 is provided at a position corresponding to the lower part of the closed container 2. The float 3 is supported by a bracket 36 via a lever 34 and a shaft 35, and the snap mechanism 5 is supported by a bracket 38 via a first shaft 37. The bracket 36 and the bracket 38 are joined by screws (not shown) and are integrally attached to the lid 8 of the sealed container 2. The lever 34 is formed by bending a plate into a “U” shape, and two plates are opposed to each other in parallel. The float 3 is connected to the bent portion of the lever 34. A shaft 40 is attached to the other end of the lever 34. When viewed from above, the bracket 36 is formed of two "L" -shaped plates, and the shafts 41 and 42 and the shaft 35 described above are bridged and connected. The shaft 35 also serves as the swing axis of the float 3. Float 3 is shaft 35
Swinging up and down around the center. The shafts 41 and 42 also serve as upper and lower stoppers of the float 3, respectively. On the other hand, the bracket 38 is also formed of two "L" -shaped plates, and the shaft 43 and the above-mentioned first shaft 37 are bridged and connected. The shaft 43 has the following first sub-arc
Also serves as a stopper for the memory 52. The snap mechanism 5 has a float arm 51,
It comprises a first sub arm 52, a second sub arm 53, a coil spring 54 in a compressed state, a spring receiving member 55 and a spring receiving member 56. The float arm 51 is composed of two plates facing each other in parallel, and each plate has an "L" shape when viewed from the front. A groove 57 is provided at the left end of the float arm 51, and the shaft 40 of the lever 34 described above is provided.
Are fitted. The right end of the float arm 51 is rotatably supported by the first shaft 37 described above. Therefore, the float arm 51 follows up and down of the float 3 and swings up and down around the first shaft 37. A second shaft 58, which is parallel to the first shaft 37, is wrapped around the lower end of the float arm 51, and a spring receiving member 55 is supported. The upper end of the first sub arm 52 is rotatably supported by the first shaft 37 described above. The first sub arm 52 is composed of two plates facing in parallel, and each plate has an "L" shape when viewed from the front. At the lower end of the first sub arm 52, a third shaft 59 parallel to the first and second shafts 37 and 58 is bridged, and a spring receiving member 56 is supported. . The distance between the first shaft 37 and the third shaft 59 is equal to the distance between the first shaft 37 and the second shaft 37.
Are formed longer than the distance between the shafts 58. A compressed coil spring 54 is mounted between the spring receiving member 56 and the above-described spring receiving member 55. Also the second
A second sub arm 53 is mounted between the third shaft 58 and the third shaft 58. The second sub-arm 53 is composed of two plates opposing each other in parallel, and the mounting portions to the second and third shafts 58 and 59 are rotatable. A portion supporting the second shaft 58 at the upper end of the second sub arm 53 is provided with a second shaft 5.
A long hole 61 extending in the third axis 59 direction is provided to guide the movable member 8 in the third axis 59 direction. Further, a shaft 60 is wound around the upper end of the first sub arm 52, and the lower end of the valve stem operating rod 28 is connected. A window 62 is opened in the float arm 51 so as not to hinder the movement of the shaft 60. 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 the working fluid. First, the working fluid introduction port 11 is connected to a high-pressure steam source, and the working fluid discharge port 13 is connected to a steam circulation pipe. Further, the pressure-feeding liquid inlet 16 is connected to the liquid storage space 1 from outside.
It is connected to a load such as a steam-using device via a check valve (not shown) that opens toward zero. On the other hand, the pumping liquid discharge port 17
Is connected to a liquid pressure destination such as a boiler via a check valve (not shown) which opens outward from the liquid storage space 10. The liquid storage space 1 of the liquid pumping device 1 of the present embodiment.
If there is no condensate within 0, the float 3 is located at the bottom as shown in FIG. At this time, the air supply valve 20 of the switching valve 4 is closed, and the exhaust valve 21 is open. Then, when condensed water is generated in a load such as a steam-using device, the condensed water flows down from the pumping liquid inlet 16 to the liquid pumping device 1 and accumulates in the liquid storage space 10. When the float 3 rises due to the condensed water collected in the liquid storage space 10, the lever 34 rotates clockwise around the shaft 35, and the shaft 40 moves downward. In conjunction with the downward movement of the shaft 40, the float arm 51
Rotates counterclockwise about the first shaft 37. The second shaft 58 is linked with the rotation of the float arm 51.
However, while moving in the direction of the third shaft 59 along the long hole 61, the line approaches the line connecting the first shaft 37 and the third shaft 59, and the coil spring 54 is compressed and deformed. Then, the float 3 is further raised, and the second shaft 58 is aligned on the line connecting the first shaft 37 and the third shaft 59, and the float 3 is still raised and the second shaft 58
Moves to the right of the line connecting the first shaft 37 and the third shaft 59, the coil spring 54 rapidly recovers from the deformation, and the third
Axis 59 snaps to the left. As a result, the first sub-arm 52 rotates clockwise, and the first sub-arm 5 rotates.
The valve shaft operating rod 28 connected to the second shaft 60 moves upward, and the air supply valve 20 is opened and the exhaust valve 21 is closed. When the working fluid inlet 11 is opened, high-pressure steam is introduced into the closed vessel 2 and the internal pressure increases,
The condensed water collected in the liquid storage space 10 is pushed by the vapor pressure and discharged from the pumping liquid discharge port 17 to an external boiler or waste heat utilization device via a check valve (not shown). As a result of the discharge of the condensate water, the water level in the condensate storage space 10 is lowered, and the float 3 is lowered. Then, lever-3
4 rotates counterclockwise about the shaft 35, and the shaft 40 moves upward. In conjunction with the upward movement of the shaft 40, the float arm 51 rotates clockwise about the first shaft 37. In conjunction with the rotation of the float arm 51, the second shaft 58 moves along the long hole 61 into the third shaft 59.
While moving in the direction, it approaches the line connecting the first shaft 37 and the third shaft 59, and the coil spring 54 is compressed and deformed. Then, the float 3 further descends, and the second shaft 58 is aligned on the line connecting the first shaft 37 and the third shaft 59, and the float 3 still descends and the second shaft 58 is moved to the second shaft 58. When the coil spring 54 moves to the left of the line connecting the first shaft 37 and the third shaft 59, the coil spring 54 rapidly recovers from the deformation, and the third shaft 59 snaps to the right. As a result, the first sub-arm 52 rotates counterclockwise, and the valve stem operating rod 28 connected to the shaft 60 of the first sub-arm 52 moves downward, and the air supply valve 20 Is closed and exhaust valve 2
1 is open. According to the liquid pumping apparatus of the present invention, the distance between the first axis and the third axis is longer than the distance between the first axis and the second axis. Therefore, the distance between the first axis and the second axis can be shortened, the distance between the first axis and the third axis can be increased, and the buoyancy is increased by the float arm transmitted to the first sub arm. The ratio increases, and the enlargement ratio by the first auxiliary arm transmitted to the valve shaft operating rod also increases. Therefore, the liquid pumping apparatus according to the present invention has an excellent effect that even when a small float is used, the switching valve is switched with a strong force to reliably pump the liquid. Further, in the liquid pumping apparatus of the present invention, the coil spring is supported by the third shaft supported by the first sub-arm and the second sub-arm supported by the float arm in the third axial direction. And a second shaft which is movably guided to the second shaft.
Therefore, the coil spring does not bend when deformed in conjunction with the float. Therefore, the liquid pumping apparatus of the present invention has an excellent effect of preventing damage to the coil spring and reliably pumping the liquid.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a liquid pumping device according to a specific embodiment of the present invention. FIG. 2 is a cross-sectional view of a snap mechanism in a conventional liquid pumping device. [Description of Signs] 2 Sealed container 3 Float 4 Switching valve 5 Snap mechanism 11 Working fluid inlet 13 Working fluid outlet 16 Pumping liquid inlet 17 Pumping liquid outlet 20 Supply valve 21 Exhaust valve 28 Valve shaft operating rod 37 First shaft 51 Float arm 52 First sub-arm 53 Second sub-arm 54 Coil spring 58 in compressed state Second shaft 59 Third shaft 61 Slot

Claims (1)

(57) [Claim 1] A float, a switching valve, and a snap mechanism are built in a closed container having a working fluid inlet, a working fluid outlet, a pumping liquid inlet, and a pumping liquid outlet. The snap mechanism includes a first shaft supported in the closed container, a float arm rotating around the first shaft, and a first sub-arm.
A second axis supported by the float arm at a point away from the first axis and parallel to the first axis;
A third axis supported by the first sub-arm at a point away from the first axis and parallel to the first axis;
And a second sub-arm mounted between the second and third shafts, the two mounting portions being rotatable and guiding the second shaft so as to be movable in the third axial direction. A compression coil spring attached between the three axes, wherein a distance between the first axis and the third axis is longer than a distance between the first axis and the second axis; A liquid pumping device, wherein the float is connected to the float arm, and the switching valve is connected to the first sub arm via a valve shaft operating rod.