JP3170672B2 - 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 condensed water to a boiler or a waste heat utilization device.

[0002]

2. Description of the Related Art Condensate generated by condensation in a steam piping system is:
It often still has a considerable amount of heat, so condensed water is collected using a liquid pumping device for effective use of energy, and this condensed water is sent to a boiler or waste heat utilization device to waste heat. Condensate recovery systems that make effective use of water are widely used.

[0003] A liquid pressure feeding device used in a condensate recovery system collects condensed water in a closed container, and switches a switching valve to introduce a high-pressure working fluid such as steam into the closed container. The condensate in the closed vessel is forcibly discharged by the pressure of the fluid. Therefore, in order to operate the liquid pumping device with high efficiency, it is necessary to store as much condensed water as possible in a closed vessel and to switch the switching valve reliably.

Therefore, in the liquid pressure feeding device, a snap mechanism using a coil spring is generally adopted, and the switching of the switching valve has been surely performed. 2. Description of the Related Art An example of a liquid pumping device including a snap mechanism using a coil spring includes a configuration disclosed in US Pat. No. 5,141,405.

FIG. 6 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. 6 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 operation rod 111 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 has the problem that the coil spring 103 is easily buckled. there were. That is, the coil spring 10
When 3 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,
This is because 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 curved in an “S” shape.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a liquid pumping apparatus in which a coil spring is hardly damaged.

[0010]

Technical features of the present invention:
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 parallel to the first axis, which is supported on the float arm at a point away from the first axis and moves on the axis of the float arm, and separated from the first axis A third axis parallel to the first axis and supported by the first sub-arm at a point, and supported on an axis of the float arm remote from the first and second axes. A fourth axis parallel to the first axis, a second sub-arm mounted between the second and third axes, and both mounting portions rotatable; A compression coil spring attached between a fourth shaft, the float connected to the float arm, and the switching valve connected to the third shaft via a valve shaft operating rod; Liquid pumping device.

[0011]

According to the liquid pumping device 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 device. 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 second shaft side approaches the line connecting the first shaft and the third shaft while moving in the fourth axial direction in conjunction with the rotation of the coil, and the coil spring is compressed and deformed. And the float went up further,
Are aligned on the line connecting the first axis and the third axis, and if the float still rises and the second axis crosses the line connecting the first axis and the third axis, the coil spring will Rapidly recovers from deformation,
Is snapped 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 valve stem operating rod connected to the third shaft moves, and the switching valve is rapidly switched.

The coil spring used in the liquid pumping apparatus of the present invention includes a second shaft supported on the float arm and moving on the axis of the float arm, and a point separated from the second shaft. And is mounted between a fourth axis parallel to the second axis, supported by the float arm. Therefore, when the coil spring deforms in conjunction with the flow,
It is deformed only in the direction of expansion and contraction on the axis of the tom, and always keeps a straight line and does not bend. Therefore, it is possible to produce a liquid pumping device with less damage to the coil spring.

[0013]

EXAMPLES Specific examples of the present invention will be described below. FIG. 1 is a sectional view of a liquid pumping apparatus according to a specific embodiment of the present invention. 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 sequentially, the closed container 2 includes 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, at a position 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 this 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 is composed of a valve case 29, a valve body 30, and a lifting rod 31. The valve case 29 has a through hole in the axial direction. A valve seat 32 is provided inside the through hole, and a valve body 30 held and fixed to the tip of an elevating rod 31 from below the valve seat 32 is brought into contact therewith. It opens and closes. 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 made of two "L" -shaped plates, and is connected to the first shaft 37 by bridging it.

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 a groove 57 is formed at the left end of the two plates.
Is provided. The float arm 51 is the first
The right end portion is rotatably supported by the shaft 37 of FIG.
The groove 57 of the front arm 51 is provided with the lever 3 described above.
The fourth shaft 40 is fitted. Therefore, Float Arm 5
1 follows the floating of the float 3 and swings up and down around the first shaft 37.

At the center of the floating arm 51, a floating
An elongated hole 61 is provided in the axial direction of the torm 51. A second shaft 58 parallel to the first shaft 37 is bridged over the long hole 61, and the spring receiving member 55 is supported by the second shaft 58. The right side of the first sub arm 52 is rotatably supported by the first shaft 37 described above. First
The sub arm 52 is composed of two plates facing in parallel.
The first and second shafts 37,
A third shaft 59 parallel to 58 is spanned. Also,
On the left side of the float arm 51, a fourth shaft 60 parallel to the first to third shafts 37, 58 and 59 described above is bridged, and the spring receiving member 56 is moved by the fourth shaft 60. Supported. A second sub-arm 53 is mounted between the second and third shafts 58 and 59. Second sub arm 5
3 is composed of two plates facing in parallel, and the second and third plates
Of the shaft 58, 59 are rotatable. A compressed coil spring 54 is mounted between the spring receiving members 55 and 56. The lower end of the valve shaft operating rod 28 is connected to the third shaft 59.

Next, the operation of the liquid pumping apparatus 1 according to the present embodiment will be described by following a series of operation procedures when steam is used as a working fluid. First, the working fluid introduction port 11 is connected to a high-pressure steam source, and the working fluid discharge port 13 is connected to a steam circulation pipe. 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 apparatus 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 floats 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. In conjunction with the rotation of the float arm 51, the second shaft 58 moves in the direction of the fourth shaft 60 along the long hole 61 while the first shaft 58 moves.
Approaching the line connecting the third shaft 59 and the third shaft 59, the coil spring 54 is compressed and deformed. And Float 3 goes up further,
The second shaft 58 is arranged on a line connecting the first shaft 37 and the third shaft 59, and the float 3 is still raised so that the second shaft 58 is moved to the first shaft 37 and the third shaft 59. When the coil spring 54 moves below the line connecting the two, the coil spring 54 rapidly recovers from the deformation, the first sub arm 52 rotates clockwise, and the third shaft 59 snaps upward. As a result, the valve shaft operating rod 28 connected to the third shaft 59 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 discharging 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 in the direction of the fourth shaft 60 along the long hole 61 while forming a line connecting the first shaft 37 and the third shaft 59. When approaching, 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 above the line connecting the first shaft 37 and the third shaft 59, the coil spring 54 rapidly recovers its deformation, and the first sub arm 52 rotates counterclockwise to rotate the third shaft. 59 snaps downward. As a result, the valve shaft operating rod 28 connected to the third shaft 59 moves downward, the air supply valve 20 closes, and the exhaust valve 21 opens.

[0028]

According to the liquid pumping apparatus of the present invention, the coil spring is mounted between the second shaft and the fourth shaft supported by the float arm, and the second shaft is the shaft of the float arm. Move on the line. Therefore, when the coil spring is deformed in conjunction with the float, it is not deformed only on the axis of the float arm in the direction of expansion and contraction, and does not bend. Therefore, the liquid pumping device of the present invention has an excellent effect that damage to the coil spring can be reduced. Further, since the valve shaft operating rod is connected to the third shaft, the third shaft connecting the first and second sub-arms can also serve as a connecting portion of the valve shaft operating rod. for that reason,
A separate shaft for connecting the valve shaft operating rod to the first sub arm is not required. Therefore, there is an excellent effect that the number of parts can be reduced and the structure can be simplified.

[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 a cross-sectional view of a snap mechanism in a conventional liquid pumping device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 Closed container 3 Float 4 Switching valve 5 Snap mechanism 11 Working fluid introduction port 13 Working fluid discharge port 16 Pumping liquid inflow port 17 Pumping liquid discharge port 20 Air supply valve 21 Exhaust valve 28 Valve shaft operating rod 37 First shaft Reference Signs List 51 float arm 52 first sub-arm 53 second sub-arm 54 compressed coil spring 58 second shaft 59 third shaft 60 fourth shaft 61 long hole

Claims (1)

(57) [Claims] An airtight container having a working fluid inlet, a working fluid outlet, a pumping liquid inlet, and a pumping liquid outlet has a float, a switching valve, and a snap mechanism built therein. A first axis supported by the first arm, a float arm rotating around the first axis, and a first sub-arm.
A second axis parallel to the first axis, which is supported by the float arm at a point away from the first axis and moves on the axis of the float arm; 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 float arm spaced from the first and second axes. A fourth shaft supported on the axis of the system and parallel to the first shaft; and a second shaft mounted between the second and third shafts, the two mounting portions being rotatable.
A compression coil spring attached between the second and fourth shafts, wherein the float is connected to the float arm, and the switching valve comprises a valve shaft operating rod; A liquid pumping device connected to the third shaft via the third shaft.