JPH08219382A - Liquid force-feeding device - Google Patents

Abstract

PURPOSE: To provide a liquid force-feeding device enabling snap mechanism to start snap movement in the initial position over a long period of time. CONSTITUTION: A float 3 and snap mechanism 5 are built in a closed container 2. The snap mechanism 5 is constituted of a lever 52, a slider 53, a coil spring 54, and two upper and lower contact parts 50 provided at the lever 52. Immediately before the coil spring 54 starts the recovery of deformation, the right end of the lever 52 comes in contact with the upper or lower contact part 50. A change-over valve 120 is connected to the upper part of the slider 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid pumping device for pumping liquid such as water and fuel. The liquid pressure-feeding device of the present invention is particularly suitable as a device for once collecting the condensate generated in the steam piping system and sending the condensate to the boiler or the waste heat utilization device.

[0002]

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

A liquid pumping device used in a condensate recovery system temporarily recovers condensate in a closed container, switches a switching valve, and introduces a high-pressure working fluid such as steam into the closed container, and operates this operation. Condensate in the closed container 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 collect as much condensed water as possible in the closed container and reliably switch the switching valve.

Therefore, a liquid pumping device generally employs a snap mechanism utilizing a coil spring to ensure switching of the switching valve. A liquid pressure-feeding device incorporating a snap mechanism using a coil spring has a configuration disclosed in US Pat. No. 5,141,405, for example.

FIG. 2 is a front view of a snap mechanism of a conventional liquid pumping device. US Pat. No. 5,141,405 mentioned above.
In the liquid pumping device disclosed in Japanese Patent No.
Is composed of a float arm 101, a sub arm 102, a coil spring 103 in a compressed state, and a valve shaft operating rod 111. The front arm 101 is a support member 105.
On the other hand, it is swingably fixed by a pin 106, and a float 108 is attached to the tip.

One end of the sub arm 102 is fixed to the supporting member 105 by means of the same pin 106 as that of the float arm 101 so that the sub arm 102 can swing, and the other end swings with a spring receiving member 116 at one end of the coil spring 103. Possibly connected by pins 110. A valve shaft operating rod 111 is connected to an intermediate portion of the sub arm 102 by a pin 107. This valve shaft operating rod 1
Reference numeral 11 is connected to the switching valve 120 shown in FIG. That is, the operating rod 121 below the switching valve 120 is connected to the valve shaft operating rod 111. The switching valve 120 includes an air supply valve 122 that opens when the valve shaft operating rod 111 rises and an exhaust valve 123 that closes. A spherical air supply valve body 124 is provided in the air supply valve 122, and a flat plate-shaped exhaust valve body 125 is provided in the exhaust valve 123 so as to be connected to the operating rod 121.

The spring receiving member 115 at the other end of the coil spring 103 in FIG. 2 is pivotally connected to the float arm 101 by a pin 112. In the liquid pumping device of the prior art, the float 108 floats when condensed water is accumulated in a closed container (not shown), 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, the coil spring 103 and the sub arm 102 are aligned in a straight line, and the float 108 is still
When the angle rises and the angle between the coil spring 103 and the sub arm 102 exceeds 180 degrees, the coil spring 103 rapidly recovers its deformation, and the connecting portion (pin 110) between the coil spring 103 and the sub arm 102 is on the lower side. Snap to. As a result, the valve shaft operating rod 111 moves downward, and the switching valve 1 shown in FIG.
20 is switched rapidly.

[0008]

The liquid pumping device of the prior art is one in which the switching valve 120 is relatively reliably switched by the snap movement of the snap mechanism 100, and the liquid is pumped relatively efficiently. However, if it is used for a long period of time, the start time of snap movement (the time when the coil spring begins to recover from deformation) will gradually be delayed,
There is a problem that switching of the switching valve 120 is not reliably performed.

That is, the component that presses the valve shaft operating rod 111 in the direction in which the switching valve 120 of the pressing force of the coil spring 103 is switched is small at the start of the snap movement, so that the pin 106 or the like swings as it is used. This is because if the rocking resistance of the moving part increases due to wear, biting of foreign matter, or the like, the snap movement cannot be started at the initial position.

If the switching valve 120 cannot be switched reliably, the liquid cannot be pumped efficiently.

The present invention focuses on the above-mentioned problems of the prior art, and an object of the present invention is to provide a liquid pumping device which can start snap movement at an initial position for a long period of time.

[0012]

The technical features of the present invention are as follows:
The airtight container has a built-in float and snap mechanism, and the airtight container has a switching valve for switching the supply and exhaust of the working fluid, a pressure-feeding liquid inlet and a pressure-feeding liquid discharge port, and the snap mechanism is a valve connected to the switching valve. The lever is connected to the shaft operating rod and the float, and the coil springs are connected to the valve shaft operating rod and the lever at both ends.The coil spring is deformed according to the movement of the float, and When the pressure exceeds a certain position, the coil spring rapidly recovers the deformation, and in the liquid pumping device that switches the switching valve via the valve shaft operating rod,
In the liquid pumping device, a contact portion with which the lever abuts is provided on the valve shaft operating rod immediately before the coil spring starts recovery from deformation, and the valve shaft operating rod is displaced in the direction of switching the switching valve.

[0013]

In the liquid pumping device of the present invention, the coil spring snaps in accordance with the movement of the float, and the switching valve is switched to pump the liquid accumulated in the closed container, similarly to the conventionally known device. In the snap mechanism adopted in the liquid pumping device of the present invention, the lever abuts the abutting portion of the valve shaft operating rod immediately before the coil spring starts to recover from deformation, and the valve shaft operating rod moves in the switching valve switching direction. Displace. Therefore, subsequently, the snap movement is continuously started at the initial position, and the snap movement is smoothly performed.

[0014]

EXAMPLES Specific examples of the present invention will be described below. FIG. 1 is a sectional view of a liquid pumping device according to a specific embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a liquid pressure-feeding device according to a specific embodiment of the present invention. Liquid pumping device 1 of the present embodiment
In the closed container 2, the float 3 and the snap mechanism 5 are arranged.

Explaining in sequence, the closed container 2 has a main body portion 7
The lid portion 8 is joined with a screw (not shown), and the liquid storage space 10 is formed inside. In this embodiment, the main body 7 of the closed container 2 is a simple container, and the characteristic components of this 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 introduction port 11, a working fluid discharge port 13 formed parallel to the working fluid introduction port 11 on the inner side of the drawing, and a pressure-feeding liquid inlet port 1.
6. A pressure-feeding 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 on the back side of the air supply valve 20, and a switching valve 120 similar to the switching valve 120 shown as the prior art in FIG. 3 is built in.

In FIG. 1, the members denoted by the reference numeral 24 are steam deflection plates, 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 this.

The pressure-feeding liquid inlet 16 is located substantially in the center of the lid portion 8, and the pressure-feeding liquid outlet 17 is provided at a position corresponding to the lower portion 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 joined by screws (not shown) and integrally attached to the lid portion 8 of the closed container 2. Shafts 38 and 39 provided on the bracket 32
Respectively also serve as upper and lower limit stoppers of the float shaft 43. The shaft 40 also serves as the swing shaft of the float 3. In the float 3, the above-mentioned shaft 40 is passed through the 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 stretched around the mounting bracket 33. Guide rollers 48 are attached to the outer circumference of the roller shaft 47 so as to be idle.

The snap mechanism 5 comprises a lever 52, a slider 53 as a valve shaft operating rod, a coil spring 54, and spring receiving members 55 and 56. The lever 52 has one end supported by a shaft 46 and the other end having the float shaft 4
The pin 45 of 3 is fitted. Therefore, the lever 52
Following the ups and downs of the float 3, it swings up and down about the shaft 46.

The side surface of the slider 53 as a valve shaft operating rod is held by a plurality of guide rollers 48 attached to a roller shaft 47, and the slider 53 is movable only in the vertical direction. On the other hand, the upper end of the slider 53 has a switching valve 120.
Are connected to the connecting portion 30 that interlocks with each other. Further, the slider is formed with two contact portions 50, one above the other. The upper contact portion 50 is provided at a position where the upper surface of the right end of the lever 52 abuts, and the lower contact portion 50 is a lever 52.
Is provided at a position where the lower surface of the right end of the abuts.

A coil spring 54 is attached between the slider 53 and the lever 52 via a spring receiving member 55 and a spring receiving member 56. The spring receiving member 55 is pivotally supported on the end of the lever 52 by a pin 75,
The spring receiving member 56 is pivotally supported by a pin 76 in a substantially central portion of the slider 53 so as to be swingable. Further, as described above, with the spring receiving members 55 and 56 connected to the lever 52 and the slider 53, respectively, the coil spring 54 is
It is in a compressed state.

On the upper part of the float shaft 43, a double valve 6 for shutting off the communication between the pressure-feeding liquid discharge port 17 and the liquid storage space 10.
One end of the double valve shaft 60 to which 1, 62 are attached is swingably connected. The double valves 61 and 62 move downward with the shaft 40 as a fulcrum in response to the rise of the float 3 to connect the liquid storage space 10 and the liquid discharge port 17, and as shown in FIG. When the grate 3 descends, it shuts off.

Next, the operation of the liquid pressure-feeding device 1 of the present embodiment will be described by following a series of operation procedures when steam is used as the working fluid. First, in the external pipe of the liquid pumping device 1, the working fluid introduction port 11 is connected to a high-pressure steam source, and the working fluid discharge port 13 is connected to the steam circulation pipe. In addition, the pressure-feeding liquid inlet 16 is provided from the outside with the liquid storage space 1
It is connected to a load such as a steam using device via a check valve (not shown) which opens toward 0. Meanwhile, the pressure-feeding liquid discharge port 17
Is connected to the waste heat utilization device via a check valve (not shown) that opens outward from the liquid storage space 10.

Liquid reservoir space 1 of liquid pumping device 1 of this embodiment
When there is no condensate in 0, the float 3 is located at the bottom as shown in FIG. In the snap mechanism 5 at this time, the connecting portion (pin 76) between the coil spring 54 and the slider 53 is located below the connecting portion (pin 75) between the coil spring 54 and the lever 52. Therefore, the coil spring 54 presses the slider 53 diagonally downward to the right 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, contacts the contact portion, and stops at a certain position. The connecting portion 30 is pulled toward the liquid storage space 10 by a slider 53, the air supply valve 20 in the switching valve 120 is closed, and the exhaust valve is opened. When condensate is generated in the load of the steam using device, the condensate is compressed by the liquid inlet 16
From the liquid to the liquid pumping device 1 and is accumulated in the liquid reservoir space 10.

When the float 3 floats up due to the condensed water stored in the liquid storage space 10, the lever 52 slowly rotates counterclockwise about the shaft 46, and the spring receiving member 55 gradually descends. At the same time, the double valves 61 and 62 are gradually opened. On the other hand, on the side of the spring receiving member 56, since the slider 53 is pressed to the lowermost end by the coil spring 54, the position of the spring receiving member 56 remains at the initial position and does not move.

Since the spring receiving members 55 and 56 are connected to the lever 52 or the slider 53 by the pins 75 and 76, the spring receiving member 5 is moved along with the movement of the lever 52.
Rotate around pins 75 and 76 according to the movement of 5,
The distance between the pins 75 and 76 becomes shorter. Therefore, the coil spring 54 is further compressed, and compression energy is accumulated in the coil spring 54. When the float 3 further floats, the above-described rocking of the lever 52 progresses, and when the coil spring 54 approaches a substantially vertical state with respect to the slider 53,
The upper surface of the right end of the lever 52 contacts the lower end of the upper contact portion 50. Then, when the float 3 rises only slightly, the lever 53 swings to press the slider 53 upward,
The joint between the slider 53 and the coil spring 54 (pin 7
6) is raised. As a result, the connecting portion (pin 75) between the lever 52 and the coil spring 54 becomes lower than the connecting portion (pin 76) between the slider 53 and the coil spring 54, and the vertical relationship between the ends of the coil spring 54 is reversed. Then, the slider 53 is pressed upward by the pressing force of the coil spring 54. 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.

When the working fluid introducing port 11 is opened, high-pressure steam is introduced into the closed container 2 to increase the internal pressure,
The condensed water accumulated in the liquid storage space 10 is pushed by the vapor pressure and is discharged from the liquid discharge port 17 to an external waste heat utilization device via a check valve (not shown). As a result, the water level in the condensate storage space 10 is lowered, and the float 3 is lowered. Snap mechanism 5
Follows a route completely opposite to the above except that the lower surface of the lever 52 at the right end contacts the upper end of the lower contact portion 50,
The lever 52 swings counterclockwise, and the slider 53 snaps in the opposite direction.

[0030]

In the liquid pumping device of the present invention, the lever abuts the abutment portion of the valve shaft operating rod immediately before the coil spring starts to recover from deformation, and the snap movement is continuously made at the initial position. Since it is started, there is an excellent effect that the snap movement is smoothly performed.

[Brief description of 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 configuration diagram showing a snap mechanism portion used in a conventional liquid pressure feeding device.

FIG. 3 is a cross-sectional view of a switching valve unit used in a conventional liquid pumping device.

[Explanation of symbols]

 3 Float 5 Snap Mechanism 11 Working Fluid Inlet 16 Pressure-feeding Liquid Inlet 17 Pressure-feeding Liquid Outlet 20 Air Supply Valve 50 Abutment Part 52 Lever 53 Slider 54 Coil Spring

Claims (1)

[Claims] 1. A closed container has a float and a snap mechanism built-in, and the closed container is provided with a switching valve for switching supply and exhaust of a working fluid, a pressure-feeding liquid inlet and a pressure-feeding liquid discharge port, and a snap mechanism for a switching valve. Has a valve shaft operating rod connected to the lever, a lever connected to the float, and a coil spring connected at both ends to the valve shaft operating rod and the lever, respectively, and the coil spring is deformed according to the movement of the float. At the same time, when the float exceeds a certain position, the coil spring rapidly recovers the deformation, and in the liquid pumping device that switches the switching valve via the valve shaft operation rod, immediately before the coil spring starts the deformation recovery, By providing the abutment part where the lever abuts on the valve shaft operating rod,
A liquid pumping device characterized in that a valve shaft operating rod is displaced in a direction of switching a switching valve.