JPH11230497A - Liquid force feed device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid force feed device capable of switching a switching valve with a smooth operation and a low buoyancy, by simplifying structure through reduction of the number of parts. SOLUTION: A float 3 is incorporated in a closed container 2 provided with a working fluid introduction port 11, a working fluid discharge port 13, a force feed liquid inflow port 16, and a force feed liquid discharge port 17. Through elevation of the float 3, a snap-mechanism 5 is operated and by swithcing opening and closing of the working fluid introduction port 11 and the working fluid discharge port 13, liquid collected in the closed contained 2 is fed with a pressure through the force feed liquid discharge port 17. The snap mechanism comprises a power transmission shaft 28 axially moved through elevation of the float 3, and an inversion leaf spring 39 having a center coupled to the power transmission shaft 28 and an outer end coupled to the closed container 2.

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 container and to reliably operate a switching valve for switching between opening and closing of a working fluid inlet and a working fluid outlet.

[0004] Therefore, in the liquid pressure feeding device, a snap mechanism has been adopted to ensure that the switching valve is switched. An example of a liquid pumping device having a built-in snap mechanism is disclosed in US Pat. No. 5,141,405.

FIG. 3 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. 3 is connected to the float arm 101 via a pin 112 via a spring receiving member 115. In the conventional liquid pumping apparatus, when condensed water accumulates 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 floating of the float 108. 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 102 moves downward, and the switching valve (not shown) is rapidly switched.

[0008]

In the prior art liquid pumping device, the switching valve is opened and closed using a snap mechanism, so that the switching of the valve is performed relatively reliably. However, there is a problem that a pin for rotatably connecting the spring receiving member is required, and the number of parts is large and the structure is complicated. In addition, the pin has a large resistance due to the frictional force, and thus lacks smoothness of operation, requires a large buoyancy to counter this large frictional resistance, and inevitably has a large external shape. there were.

The present invention focuses on the above-mentioned problems of the prior art, reduces the number of parts, simplifies the structure, operates smoothly and can switch the switching valve with small buoyancy. The purpose is to provide.

[0010]

Technical features of the present invention:
A float is 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 operated by raising and lowering the float to operate with the working fluid inlet. In a liquid pumping device for pumping liquid accumulated in a sealed container from a pumping liquid outlet by switching the opening and closing of a switching valve of a fluid outlet, a snap mechanism is a power transmission that moves in the axial direction by raising and lowering a float. There is provided a liquid pumping apparatus including a shaft, and a reversing leaf spring having a center connected to the power transmission shaft and an outer end connected to the closed container.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION
The power transmission shaft moves in the axial direction by the lifting and lowering of the power transmission shaft, and in conjunction with the movement of the power transmission shaft, the reversing leaf spring whose center is connected to the power transmission shaft is deformed and inverted. The power transmission shaft snaps due to the reversal of the reversing leaf spring, and the switching valve is rapidly switched.

The snap mechanism employed in the liquid pressure feeding device of the present invention has a power transmission shaft which moves in the axial direction by elevating and lowering the float, a center connected to the power transmission shaft, and an outer end connected to the closed container. And a reversing leaf spring, so that a fulcrum for rotatably connecting the spring receiving member is not required. Therefore, the number of parts can be reduced and a simple structure can be achieved. Further, since there is no rotation fulcrum in the spring receiving portion, the operation is extremely smooth, and the switching valve can be switched with a strong force even with a small buoyancy, that is, a small float.

[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. FIG. 2 is an enlarged sectional view taken along the line AA of FIG. In FIG. 1, a liquid pumping apparatus 1 of the present embodiment includes a closed container 2
Inside, a float 3, a switching valve 4, and a snap mechanism 5 are arranged.

To be described sequentially, the closed container 2 includes a main body 7
And a lid 8 are connected by screws (not shown), and a float 3, a switching valve 4, and a snap mechanism 5 are disposed in a liquid storage space 10 formed therein. 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.

As shown in FIG. 2 in an enlarged manner, an air supply valve 20 is mounted inside the working fluid inlet 11 and an exhaust valve 21 is mounted inside the working fluid outlet 13. The air supply valve 20 includes a valve case 22, a valve body 23, and an elevating 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 distal end of the valve case 22 of the air supply valve 20 is screwed into the working fluid inlet 11. The valve element 23 is
It is spherical and is on the working fluid inlet 11 side, and is opened and closed by the upper end of the lifting rod 24 abutting. The lifting rod 24 passes through the through hole of the valve case 22 to the closed container 2 side, and a continuous plate 27 is connected to a groove formed at the lower end. Continuous plate 27
Are connected to a power transmission shaft 28.

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, and a valve seat 32 is provided inside the through hole.
The valve body 30 held and fixed from below the valve seat 32 to the tip of the lifting rod 31 abuts and opens and closes. A groove is formed at the lower end of the elevating rod 31 and the connecting plate 27 is connected thereto.
A gap 33 is formed between the lower surface of the continuous plate 27 and the lower wall of the groove of the lifting rod 31. The switching valve 4 is constituted by the air supply valve 20 and the exhaust valve 21, and when the air supply valve 20 is opened, the exhaust valve 21 is opened.
Is closed, and when the air supply valve 20 is closed, the exhaust valve 21 is opened.

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 float arm 34 and a swing shaft 35. The bracket 36 is integrally attached to the lid 8 of the closed container 2 by screws (not shown). The float arm 34 is formed by bending a plate into a “U” shape. Two plates are opposed in parallel, and a float 3 is joined to the left end. A long hole 37 is provided in the float arm 34, and a shaft 38 is extended in the long hole 37. The lower end of the power transmission shaft 28 is connected to the shaft 38. The float 3 swings up and down about the swing shaft 35, and after swinging a predetermined amount, the power transmission shaft 28 is displaced up and down.

The power transmission shaft 28 has a thread formed on the entire outer periphery, and the center of a reversing leaf spring 39 is connected to the substantially middle portion thereof. The reversing leaf spring 39 is a disk-shaped member formed by curving upward and convexly, and has a hole at the center. The center hole is inserted into the power transmission shaft 28 and is sandwiched between two upper and lower nuts. It is fixed to. The outer peripheral edge of the reversing leaf spring 39 is placed on two left and right “L” -shaped holding portions 40 and 41 integrally formed on the upper portion of the bracket 36 at the right and left sides, and vertically through washers 42 and 43. , Bolts 44, 45
And nuts 46 and 47. Power transmission shaft 28
And the reversing leaf spring 39 constitute the snap mechanism 5.

Next, the operation of the liquid pumping apparatus 1 of this 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 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. Then, the reversing leaf spring 39 curves downward and the power transmission shaft 28 moves downward, so that 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 float arm 34 rotates clockwise about the swing shaft 35, and the lower end of the long hole 37 is pivoted. After contacting the power transmission shaft 38, the power transmission shaft 28 is lifted upward, and the central portion of the reversing leaf spring 39 is raised upward in conjunction with the power transmission shaft 28. Then, the reversing leaf spring 39
Is inverted before the center reaches the middle point, and curves upwardly convexly. By reversing the reversing leaf spring 39, the power transmission shaft 2
8 snaps upward. As a result, the power transmission shaft 2
The lifting rods 24, 31 connected to the air-conditioning unit 8 via the connecting plate 27 move upward, the air supply valve 20 is opened, and the exhaust valve 2 is opened.
1 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).

When the water level in the condensate storage space 10 decreases as a result of discharging the condensate water and the float 3 descends, the float arm 34 rotates counterclockwise about the first shaft 35. ,
After the upper end of the long hole 37 contacts the shaft 38, the power transmission shaft 28
Is pushed down. The central portion of the reversing leaf spring 39 is pushed downward in conjunction with the power transmission shaft 28.
Then, the reversing leaf spring 39 is reversed just before the center reaches the intermediate point, and curves downwardly convex. This reversal of the reversing leaf spring 39 causes the power transmission shaft 28 to snap downward.
As a result, the lifting rods 24, 31 connected to the power transmission shaft 28 via the connecting plate 27 move downward, and the air supply valve 20 is closed and the exhaust valve 21 is opened.

[0026]

As described above, the liquid pumping apparatus of the present invention
Since the number of fulcrums is small and the loss of force due to frictional force is small, the structure is simple, the operation is smooth and the switching valve can be switched with a strong force, and there is an excellent effect that the liquid can be reliably pumped. .

[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 sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view of a snap mechanism in a conventional liquid pressure feeding 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 Supply valve 21 Exhaust valve 28 Power transmission shaft 34 Float arm 35 Oscillating shaft 39 Reversing leaf spring

Claims (1)

[Claims] 1. A float is built in a sealed container having a working fluid inlet, a working fluid outlet, a pumping liquid inlet, and a pumping liquid outlet, and is operated by operating a snap mechanism by raising and lowering the float. In a liquid pumping device that pumps liquid accumulated in a sealed container from a pumping liquid outlet by switching the opening and closing of a switching valve between a fluid inlet and a working fluid outlet, a snap mechanism uses an axial direction by raising and lowering a float. And a reversing leaf spring whose center is connected to the power transmission shaft and whose outer end is connected to the closed container.