JPH07286577A - Liquid pressure-feeding device - Google Patents

Abstract

PURPOSE:To reduce damage at a pin part in a snap mechanism, and improve durability. CONSTITUTION:A float 3 and a snap mechanism 5 are included in a closed container 2. The snap mechanism 5 is composed of a lever 52, a slider 53, a coil spring 54, a male spring receiving member 55, and a female spring receiving member 56. Four guide rollers 48 comprising ceramic material are installed on side parts of the slider 53. A change-over valve 120 is connected to an upper part of the slider 53. The coil spring 54 is installed around a series of shaft cores composed of the male spring receiving member 55 and the female spring receiving member 56.

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 in order to effectively use energy, the condensed water is collected using a liquid pumping device, and this condensed water is sent to a boiler or a 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, and further switches a switching valve to introduce a high-pressure working fluid such as steam into the closed container, and operate 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 store 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, and a coil spring 103 in a compressed state. The float arm 101 is attached to the support member 105 by the pin 106.
It is swingably fixed by the
Is attached.

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. 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 other end of the coil spring 103 shown in FIG. 2 is connected to the float arm 101 by a pin 112. In the liquid pumping device of the prior art, when condensed water is accumulated 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 of the float 108. And coil spring 10
3 is compressed and deformed. Then, the float 108 further rises, the coil spring 103 and the sub arm 102 are arranged in a straight line, and the float 108 still rises and the coil spring 103
When the angle of 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 snaps downward. As a result, the valve shaft operating rod 111 moves downward, and the switching valve 120 shown in FIG. 3 is rapidly switched.

[0008]

The liquid pumping device of the prior art is capable of pumping liquid relatively efficiently with a simple structure, but the pin 107 for mounting the valve shaft operating rod 111 is damaged. There was a problem that it was easy. That is, in the liquid pumping device of the related art, since the valve shaft operating rod 111 moves up and down while rotating around the pin 106, the pin 107 portion is constantly subject to a rotating moment and is easily worn. Is.

Further, the supply / exhaust valve 120 has a structure in which when one valve is closed, the other valve is opened. It cannot be received, and the rotary moment acts on the valve shaft operating rod 111 itself, so that the contact between the pin 107 and the valve shaft operating rod 111 is not uniform and the pin 107 is partially Uneven wear results in damage.

When the pin 107 is damaged, the switching valve 120
Therefore, it becomes impossible to reliably switch between the two, and it becomes impossible to efficiently pump the liquid.

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 is less likely to be damaged by a pin interlocking with a valve shaft operating rod and has high durability.

[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 is provided with 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 linked to the switching valve. A valve shaft operating rod and a coil spring are provided, and at least one end of the coil spring is deformed in response to movement of the float in conjunction with the float, and when the float exceeds a certain position, the coil spring is In a liquid pumping device that rapidly recovers deformation and switches the switching valve via a valve shaft operating rod linked to a coil spring, a plurality of guide rollers made of ceramic material are connected to the side of the valve shaft operating rod. Then, there is a liquid pumping device in which the valve shaft operating rod is slidable only in the vertical direction. Alumina, silicon nitride, zirconia or the like can be used as the ceramic material used for the above guide roller.

[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. The valve shaft operating rod used in the liquid pressure-feeding device of the present invention slides in the vertical direction by the plurality of guide rollers that are arranged side by side. Therefore, the rotating moment does not act on the pin interlocking with the valve shaft operating rod, and the rotating moment acting on the valve shaft operating rod itself when the switching valve is opened and closed.
Since the ment is received by a plurality of guide rollers, the pin portion is not unevenly worn. In particular, a guide roller made of a ceramic material used in the liquid pumping device of the present invention.
Since the foreign matter such as iron powder does not adhere to the la and the la has excellent abrasion resistance, the sliding resistance does not increase.

[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 at 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. A guide roller 48, which is made of a ceramic material, is attached to the outer periphery 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, 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 the shaft 4
It swings up and down about 6.

The side surface of the slider 53 as a valve shaft operating rod is sandwiched by a plurality of guide rollers 48 made of a ceramic material attached to the roller shaft 47 and is movable only in the vertical direction. On the other hand, slider-5
The upper end of 3 is connected to the connecting portion 30 that interlocks the switching valve 120. Between the slider 53 and the lever 52,
The coil spring 54 is attached via the male spring receiving member 55 and the female spring receiving member 56. Male spring receiving member 5
Although not shown, the 5 and the female spring receiving member 56 are provided with a shaft portion and a bearing portion, respectively, so as to be slidable in the axial direction. The coil spring 54 is mounted on the shaft cores of the spring receiving members 55 and 56. The male spring receiving member 55 is pivotally supported by the pin 75 at the end of the lever 52, and the female spring receiving member 56 is pivotally supported by the pin 76 at substantially the center of the slider 53. Therefore, the coil spring 54 is connected between the tip end side of the lever 52 and the slider 53 with a rotating pair. Further, as described above, the spring receiving members 55, 56
The coil spring 54 mounted on the shaft core is in a compressed state in a state where the coil spring 54 is connected to the lever 52 and the slider 53, respectively.

On the upper part of the float shaft 43, the double valve 6 for shutting off the communication between the pressure-feeding liquid discharge port 17 and the liquid storage space 10 is established.
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 vapor 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. Further, 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 male spring receiving member 55 gradually moves downward. Double valve 61, 62
Is gradually opened. 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
By the mutual sliding of 5, 56, the interval between the pins 75, 76 becomes shorter, the coil spring 54 is further compressed, and compression energy is accumulated in the coil spring 54. Further flow
When the lever 3 floats, the above-described swing of the lever 52 progresses, and the coil spring 54 becomes vertical to the slider 53. Then, when the float 3 rises slightly more, the connecting portion between the lever 52 and the coil spring 54 (pin 7
5) descends, 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.
It is below the connecting portion (pin 76) with and the vertical relationship of both ends of the coil spring 54 is reversed. Then the coil spring 5
The slider 53 is pressed upward by the pressing force of 4. 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.

During the snap movement of the slider 53, the spring load of the coil spring 54 acts on the pin 76 in the diagonally right downward direction, but the rotational moment does not act. When the air supply valve 20 is opened and the exhaust valve is closed,
Since the central axis of the exhaust valve and the central axis of the actuation rod 121, that is, the central axis of the valve shaft operating rod 111 do not coincide with each other, the rotary moment also acts on the valve shaft operating rod 111, but in the present embodiment, 4 guide rollers 4 made of ceramic material
The load is distributed at 8. Further, since the guide roller 48 made of a ceramic material does not have foreign matter such as iron powder attached thereto and has excellent wear resistance, sliding resistance does not increase. Therefore, the snap mechanism 5 can be smoothly moved for a long period of time.

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

When the working fluid introduction port 11 is opened, high-pressure steam is introduced into the closed container 2 and the internal pressure rises,
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 path completely opposite to the above, the lever 52 swings counterclockwise, and the coil spring 54 and the slider 53 are again in a right-angled positional relationship. Then, the slider 53 snaps in the opposite direction to the above.

[0031]

In the liquid pumping device of the present invention, the rotary shaft does not act on the pin interlocking with the valve shaft operating rod, and the valve shaft operating rod operates when opening and closing the supply / exhaust switching valve. Since the rotating moment of is received by a plurality of guide rollers instead of being received by the pin, the uneven load is dispersed and uneven wear of the pin portion is reduced. Furthermore, the sliding resistance of the guide roller made of a ceramic material does not increase. Therefore, the liquid pumping device of the present invention has an excellent effect that the pin interlocking with the valve shaft operating rod is less damaged and the durability is high.

[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 introduction port 16 Pressure feed liquid inlet 17 Pressure feed liquid discharge port 20 Air supply valve 48 Guide roller 52 Lever 53 Slider 54 Coil spring

Claims (1)

[Claims] 1. A closed container has a built-in float and a snap mechanism, and the closed container is provided with a switching valve for switching between supply and exhaust of a working fluid, a pressure-feeding liquid inlet and a pressure-feeding liquid discharge port, and the snapping mechanism has the switching function. It has a valve shaft operating rod linked to a valve and a coil spring, and at least one end of the coil spring is deformed according to the movement of the float in conjunction with the float and the float exceeds a certain position. In the liquid pumping device that switches the switching valve via the valve shaft operating rod linked to the coil spring, the coil spring rapidly recovers its deformation, and a plurality of guide rollers made of a ceramic material are provided on the side of the valve shaft operating rod. -The liquid pumping device characterized in that the valve shaft operating rod is slidable only in the up-down direction by connecting the la.