JP3026140B2 - 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 pumping device of the present invention once collects the condensate generated in the steam using device,
This condensate is particularly suitable as a device for sending it to a boiler or a waste heat utilization device.

[0002]

2. Description of the Related Art Condensate generated by condensing in a steam-using apparatus often still has a considerable amount of heat. Therefore, for effective use of energy, the condensate is recovered using a liquid pumping apparatus. A condensate recovery system that sends this condensed water to a boiler or a waste heat utilization device to effectively use the waste heat is 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 condensed water in the closed vessel is forcibly discharged by the pressure of the fluid, and the condensed water of a relatively low pressure is usually sent to a high-pressure boiler by pressure.

[0004]

[0005] As a conventional liquid pressure feeding device, for example, there is one proposed in Japanese Patent Application No. 4-61411. this is,
When the condensate sump chamber is at a predetermined low water level, the reducing port, that is, the pumping liquid discharge port is closed, so that the vapor pressure does not leak even if the primary pressure of the liquid pumping device becomes higher than the secondary pressure. A valve means for opening a pressure-feed liquid discharge port by ascending is connected to a float. By connecting the valve means,
Even if the primary pressure becomes higher than the secondary pressure, the valve means will not be opened unless condensed water accumulates and the float rises, thus preventing leakage of steam.

[0006]

The above-mentioned prior art liquid pumping apparatus can prevent the leakage of steam due to the pressure change, but has a problem that the pin for mounting the valve stem is easily damaged. . This is because the supply / exhaust valve has a structure in which one valve closes and the other valve opens, so that it cannot receive a reaction force at the time of opening / closing of the supply / exhaust valve on the center axis of the valve rod, Rotational moment acts on the valve stem itself, resulting in non-uniform contact between the pin and the valve stem, resulting in partial uneven wear of the pin and damage.

When the pin is damaged, the supply and exhaust valves cannot be reliably switched, and the liquid cannot be efficiently pumped.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a highly durable liquid pumping apparatus in which a pin interlocking with a valve stem is less damaged.

[0009]

Technical features of the present invention:
A float and a snap mechanism are built in the closed container, and the closed container is provided with a switching valve for switching between supply and exhaust of the working fluid, a pumping liquid inlet and a pumping liquid outlet, and the snap mechanism is linked to the switching valve. It has a valve stem operating rod and a coil spring, and at least one end of the coil spring is interlocked with the float via a flow lever, is deformed in accordance with the movement of the float, and has a fixed position in the float. When the pressure exceeds the limit, the coil spring suddenly recovers the deformation, and in the liquid pumping device for switching the switching valve via a valve shaft operating rod linked to the coil spring, a plurality of guide rollers are provided beside the valve shaft operating rod. And the valve shaft operating rod is slidable only in the vertical direction, and a liquid valve is provided on the flow lever to provide a valve for shutting off communication between the inside of the sealed container and the pressure-feed liquid discharge port. Pumping equipment Located in.

[0010]

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 in the prior art. The valve shaft operating rod employed in the liquid pressure feeding device of the present invention is slid in the vertical direction by a plurality of guide rollers provided sideways. Therefore, since the rotating moment acting on the valve shaft operating rod itself when the switching valve is opened and closed is received by the plurality of guide rollers, there is no uneven wear on the pin portion.

[0011]

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 and a snap mechanism 5 are arranged in a closed container 2.

To explain sequentially, the closed container 2 is composed of 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 has four openings, specifically, a working fluid inlet 11, a working fluid outlet 13 formed in parallel with the working fluid inlet 11 on the back side of the drawing, and a pumping liquid inlet 1.
6, a pumping liquid discharge port 17 is provided.

An air supply valve 20 is built in the working fluid inlet 11. Further, an exhaust valve (not shown) is built in the back side of the air supply valve 20, and a switching valve 120 similar to the conventional air supply and exhaust valves is built in.

In FIG. 1, the member numbered 24 is a steam deflecting plate, and the steam injected from the air supply valve 20 is brought into direct contact with the condensate in the liquid storage space 10. It acts as a baffle to prevent the situation.

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 32 via a float shaft 43 and a shaft 40, and the snap mechanism 5 is supported by a bracket 33.
The bracket 33 and the bracket 32 are connected by screws (not shown) and are integrally attached to the lid 8 of the closed container 2. Shafts 38 and 39 provided on bracket 32
Are also used as upper and lower stoppers of the float shaft 43. The shaft 40 also serves as a swing shaft of the float 3. The float 3 has the shaft 40 penetrated through a float shaft 43 and swings up and down about the shaft 40. A pin 45 is attached to the other end of the float shaft 43.

A shaft 46 serving as a swing fulcrum and four roller shafts 47 are wrapped around the mounting bracket 33. The guide roller 4 is provided on the outer periphery of the roller shaft 47.
8 is rotatably mounted.

The snap mechanism 5 comprises a lever 52, a slider 53 as a valve shaft operating rod, a coil spring 54, a male spring receiving member 55, and a female spring receiving member 56.
One end of the lever 52 is supported by a shaft 46, and the pin 45 of the float shaft 43 is fitted to the other end. Therefore, the lever 52 follows the ups and downs of the float 3 and
Swing up and down around 6.

The slider 53 serving as a valve shaft operating rod has its side face sandwiched by a plurality of guide rollers 48 attached to a roller shaft 47, and can move only in the vertical direction. On the other hand, the upper end of the slider 53 is
Are connected to a connecting portion 30 that works together. Slider-5
A coil spring 54 is attached between the lever 3 and the lever 52 via a male spring receiving member 55 and a female spring receiving member 56. Although not shown, the male spring receiving member 55 and the female spring receiving member 56 are provided with a shaft portion and a bearing portion, respectively, and are slidably disposed in the axial direction. The coil spring 54 is provided on the axis of the spring receiving members 55 and 56. The male spring receiving member 55 is pivotally supported at the end of the lever 52 by a pin 75, and the female spring receiving member 56 is
53 is supported at a substantially central portion thereof. Therefore, the coil spring 54 is connected between the distal end side of the lever 52 and the slider 53 with a rotating pair. With the spring receiving members 55 and 56 connected to the lever 52 and the slider 53, respectively, as described above, the coil spring 54 sheathed on the shaft core is in a compressed state.

On the upper part of the float shaft 43, a double valve shaft 60 is provided with double valves 61 and 62 as valve portions for shutting off the communication between the pressurized liquid discharge port 17 and the liquid storage space 10 via the pin 41. Is connected to be swingable. Double valve 6
1 and 62 move downward with the shaft 40 as a fulcrum in accordance with the rise of the float 3 to communicate the liquid storage space 10 with the liquid discharge port 17, and as shown in FIG. Is shut off when falls. A drift plate 6 having a substantially U-shaped cross section and a plurality of openings 63 at an intermediate portion between the double valves 61 and 62.
4 is attached.

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. At this time, in the snap mechanism 5, the joint (pin 76) between the coil spring 54 and the slider 53 is lower than the joint (pin 75) between the coil spring 54 and the lever 52. Therefore, the coil spring 54 presses the slider 53 obliquely downward rightward by the reaction force. Therefore, the slider 53 is pressed downward by the vertically downward component of the pressing force of the coil spring 54, and comes into contact with the contact portion and stops at a fixed position. The connecting portion 30 is pulled toward the liquid storage space 10 by the slider 53, and the air supply valve 20 of the switching valve 120 is closed and the exhaust valve is open. When condensed water is generated in a load such as a steam-using device, the condensed water is supplied to the pumping liquid inlet 16.
The liquid flows down 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 52 slowly rotates counterclockwise about the shaft 46, and the male spring receiving member 5 is rotated.
5 gradually lowers, and the double valves 61 and 62 also gradually lower and open. On the other hand, on the female spring receiving member 56 side, since the slider 53 is pressed to the lowermost end by the coil spring 54, the position of the female spring receiving member 56 remains at the initial position and does not move.

As the lever 52 moves, the spring receiving member 5
Due to the mutual sliding of the pins 5 and 56, the interval between the pins 75 and 76 is shortened, the coil spring 54 is further compressed, and compression energy is accumulated in the coil spring 54. Further flow
When the disk 3 rises, the above-described swing of the lever 52 advances, and the coil spring 54 is brought into a vertical state with respect to the slider 53. When the float 3 rises a little further, the joint between the lever 52 and the coil spring 54 (pin 7
5) is lowered, and finally the connecting portion (pin 75) between the lever 52 and the coil spring 54 is moved to the slider 53 and the coil spring 54.
The lower side of the coupling portion (pin 76) of the coil spring 54 reverses the vertical relationship between both ends of the coil spring 54. Then coil spring 5
With the pressing force of 4, the slider 53 is pressed upward. As a result, the slider 53 snaps upward, the connecting portion 30 connected to the slider 53 is pushed up, the air supply valve 20 is opened, and the exhaust valve is closed.

In this embodiment, when the slider 53 is snapped, the load is distributed by receiving the rotating moment acting on the slider 53 by the four guide rollers 48. Therefore, the wear of the pin 76 is reduced and the snap mechanism 5 having a long life can be obtained.

In this embodiment, an example is shown in which four guide rollers 48 are used, two on each of the left and right sides of the slider 53, but the number of guide rollers 48 is
Can be appropriately selected according to the length of the coil spring 54, the spring load of the coil spring 54, and the like. Further, the guide rollers 48 can be arranged at least on the right side of the slider 48 in this embodiment without being arranged on the left and right sides of the slider 48.

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 stored in the liquid storage space 10 is pushed by the vapor pressure and discharged from the liquid discharge port 17 to an external boiler or a waste heat utilization device via a check valve (not shown). In this case, in this embodiment, since the double valves 61 and 62 are mounted via the drift plates 64, the flow of the fluid from one of the valves does not hinder the movement of the other valve, and the wide opening is doubled. It can be opened and closed by the valves 61 and 62, and a large amount of condensate can be discharged at a stretch.

As a result of discharging the condensate water, the water level in the condensate storage space 10 decreases, and the float 3 descends. Snap mechanism 5
Is previously completely follows the reverse path to the swings lever -52 is it clockwise, the coil spring 54 and the slider -53 is perpendicular positional relationship again. Then, the slider 53 snaps in a direction completely opposite to the above.

[0029]

According to the liquid pressure feeding device of the present invention, the rotation moment of the valve shaft operating rod acting when the supply / exhaust switching valve is opened / closed is received not by pins but by a plurality of guide rollers. The uneven load is dispersed, and the pin portion is less likely to be unevenly worn. Therefore, the liquid pumping device of the present invention has less damage to the pin that is interlocked with the valve shaft operating rod,
There is an excellent effect with high durability.

[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.

[Explanation of symbols]

 3 Float 5 Snap Mechanism 11 Working Fluid Inlet 16 Pumping Liquid Inlet 17 Pumping Liquid Outlet 20 Supply Valve 48 Guide Roller 52 Lever 53 Slider 54 Coil Spring 61,62 Double Valve

Claims (1)

(57) [Claims] An airtight container has a built-in float and a snap mechanism, and the airtight container is provided with a switching valve for switching between supply and exhaust of a working fluid, and a pumping liquid inlet and a pumping liquid discharge port. A valve shaft operating rod and a coil spring linked to the valve, at least one end of the coil spring interlocking with the float via a flow lever,
When the float is deformed in response to the movement of the float and the float exceeds a certain position, the coil spring rapidly recovers from the deformation and switches the switching valve via a valve shaft operating rod linked to the coil spring. In the liquid pumping device, a plurality of guide rollers are connected to the side of the valve shaft operating rod so that the valve shaft operating rod can slide only in the vertical direction, and the inside of the sealed container and the pumping liquid discharge port are connected. A liquid pressure feeding device, characterized in that a valve portion for shutting off communication between the two is attached to the flow lever.