JP4132262B2 - Liquid pumping device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid pumping device that pumps liquid such as water or fuel. The liquid pressure feeding device of the present invention is particularly suitable as a device that once collects the condensate generated in the steam piping system and sends this condensate to a boiler or a waste heat utilization device.
[0002]
[Prior art]
Condensate generated by condensing in the steam piping system still often has a considerable amount of heat. Therefore, for effective use of energy, the condensate is recovered using a liquid pumping device. A condensate recovery system that effectively uses waste heat by sending it to boilers and waste heat utilization devices is widely used. The liquid pumping device used in the condensate recovery system temporarily stores condensate in a sealed container, and further switches the switching valve to introduce a high-pressure working fluid such as steam into the sealed container. Condensate in a sealed container is forcibly discharged.
[0003]
The prior art liquid pumping apparatus will be described below. FIG. 3 is a partial cross-sectional perspective view of a conventional liquid pumping device, and FIG. 4 is an enlarged cross-sectional view of a switching valve portion of the conventional liquid pumping device. In FIG. 3, the liquid pressure feeding device 100 includes a sealed container 101 in which a float 120, a switching valve 130, a snap mechanism 140 and the like are built. The hermetic container 101 is provided with a pressurized liquid inlet 102 and a pressurized liquid outlet 103 near the bottom, and check valves 105 and 106 are attached to the inlet and outlet, respectively. The check valve 105 is attached in a direction allowing the inflow of condensate into the sealed container 101, and the check valve 106 is attached in a direction allowing the condensate to be pumped from the sealed container 101 to the outside.
[0004]
Further, a working fluid introduction port 108 and a working fluid discharge port 109 are provided at the top of the hermetic container 101, and a switching valve 130 including an air supply valve 110 and an exhaust valve 111 is attached as shown in FIGS. . The air supply valve 110 and the exhaust valve 111 both open and close by moving the elevating rods 112 and 113 up and down. The air supply valve 110 opens when the elevating rod 112 is raised. It closes when the lifting bar 113 is raised. The elevating bars 112 and 113 are coupled in parallel by the continuous plate 115, and the supply valve 110 and the exhaust valve 111 are simultaneously opened and closed by moving the continuous plate 115 up and down.
[0005]
In the liquid pressure feeding device 100 of the prior art, the pressure feeding liquid inlet 102 is connected to a vapor load via a check valve 105, and the pressure feeding liquid discharge port 103 is connected to a boiler or a waste heat utilization device via a check valve 106. Is done. The working fluid inlet 108 is connected to a high pressure fluid source. When there is no condensate in the sealed container 101, the float 120 is in the lower position and the connecting plate 115 is lowered. Therefore, in the air supply valve 110, the elevating rod 112 is lowered, and a ball-shaped air supply valve body 122 fixed to the tip of the elevating rod 112 closes the air supply valve port 123, whereby the working fluid inlet 108 is opened. Closed. On the other hand, in the exhaust valve 111, the elevating rod 113 is lowered, and a disc-shaped exhaust valve body 127 attached to the tip of the elevating rod 113 opens the exhaust valve port 128, thereby opening the working fluid discharge port 109. Yes.
[0006]
When condensate is generated within the steam load to which the liquid pressure feeding device 100 is connected, the condensate flows into the sealed container 101 from the check valve 105 and accumulates. As the amount of condensate increases, the float 120 rises, and one end of the arm 118 rises accordingly. When the arm 118 exceeds a certain position, the snap mechanism 140 is reversed, the power transmission shaft 121 is moved upward, and the connecting plate 115 is lifted.
[0007]
Then, in the air supply valve 110, the elevating rod 112 attached to the connecting plate 115 is raised, the air supply valve body 122 opens the air supply valve port 123, and the working fluid introduction port 108 is opened. On the other hand, since the exhaust valve body 127 closes the exhaust valve port 128 at this time, the working fluid discharge port 109 is closed and the pressure in the hermetic container 101 rises and is pressed by the pressure to be condensed from the pumping liquid discharge port 103. Is pumped.
[0008]
[Problems to be solved by the invention]
The liquid pumping device of the prior art can pump liquid efficiently by switching the opening and closing of the switching valve consisting of the exhaust valve and the air supply valve by snapping the power transmission shaft in accordance with the lift of the float It is. However, it requires a connecting plate for connecting the power transmission shaft to the air supply valve body and the exhaust valve body, a lifting rod for connecting the connecting plate to the air supply valve body, etc., and has a large number of parts and a complicated structure. There was a problem.
[0009]
The present invention pays attention to the above-mentioned problems of the prior art, and an object thereof is to provide a liquid pumping device having a simple structure by reducing the number of parts.
[0010]
[Means for Solving the Problems]
A feature of the present invention is that a float is disposed in a sealed container having a working fluid introduction port, a working fluid discharge port, a pumping liquid inflow port, and a pumping liquid discharge port, and the power transmission shaft is snap-moved according to the elevation of the float. Switch the opening and closing of the switching valve consisting of the exhaust valve and the air supply valve, first open the exhaust valve, open the working fluid discharge port, close the air supply valve, close the working fluid inlet port, and liquid from the pressure feed liquid inlet the flowed, then the working fluid discharge port to close the exhaust valve to open the closed by air supply valve the working fluid inlet port accumulated in the opening to a closed vessel liquid at a liquid pumping device for pumping the pumping fluid outlet The supply valve opens and closes the supply valve port from the working fluid inlet side.The exhaust valve opens and closes the exhaust valve port from the liquid storage space side . There are, the exhaust valve body is connected directly to the power transmission shaft, the exhaust valve member Write to place the air supply valve element, there is provided a liquid pumping apparatus adapted to open manipulate air supply valve body with the exhaust valve member by upward movement of the power transmission shaft.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In the liquid pressure feeding device of the present invention, similarly to the conventionally known one, the power transmission shaft is snapped according to the elevation of the float to switch the opening and closing of the switching valve consisting of the exhaust valve and the air supply valve. Open and open the working fluid discharge port, close the air supply valve, close the working fluid introduction port and allow liquid to flow in from the pumped liquid inlet, then close the exhaust valve and close the working fluid discharge port and close the air supply valve The working fluid introduction port is opened and the liquid accumulated in the sealed container is pumped from the pumping liquid discharge port.
[0012]
In the liquid pumping device of the present invention, the exhaust valve body is directly connected to the power transmission shaft, and the supply valve body is opened by the exhaust valve body. And a connecting plate for connecting to the exhaust valve body and a lifting bar for connecting the connecting plate to the air supply valve body are not required separately, and a liquid pumping device having a simple structure can be made by reducing the number of parts. it can.
[0013]
【Example】
Specific examples of the present invention will be described below. FIG. 1 is a cross-sectional view of a liquid pumping apparatus according to a specific embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a switching valve portion of FIG. In FIG. 1, a liquid pumping apparatus 1 according to this embodiment is configured such that a float 3, a switching valve 4, and a snap mechanism 5 are disposed in a sealed container 2.
[0014]
To explain sequentially, in the sealed container 2, the lid portion 11 is coupled by a bolt (not shown) to the main body portion 10 in which the bottom plate 8 and the top plate 9 are welded to the side tube 7, and the liquid reservoir space 12 is formed inside. Is. A pressurized liquid inlet 13 and a pressurized liquid outlet 14 are provided in the lower part of the main body 10 of the sealed container 2, and a working fluid inlet 15 and a working fluid outlet 16 are provided in the lid 11.
[0015]
A switching valve 4 including an air supply valve 20 and an exhaust valve 21 is provided inside the working fluid introduction port 15 and the working fluid discharge port 16. The valve case 22 of the switching valve 4 has an air supply valve port 23 opened in the vertical direction at the center, an annular groove 24 around the air supply valve port 23, and three exhaust valve ports communicating downward from the annular groove 25. Further, the valve case 22 has three openings 26 that connect the air supply valve port 23 and the liquid reservoir space 12, four openings 27 that communicate the exhaust valve port 25 and the liquid reservoir space 12, and an exhaust valve element 33. Has an opening 29 for inserting the. The working fluid introduction port 15 communicates with the liquid reservoir space 12 through the opening 26 from the supply valve port 23, and the working fluid discharge port 16 passes through the annular groove 24, the exhaust valve port 25 and the opening 27 from the annular hole 30. 12 communicates.
[0016]
An air supply valve body 31 that opens and closes the air supply valve port 23 is disposed on the side of the air supply valve port 23 on the working fluid introduction port 15 side. The air supply valve body 31 has a spherical shape, and is integrally attached to the tip of the lift bar 32. An exhaust valve body 33 that opens and closes the exhaust valve port 25 is disposed on the liquid reservoir space 12 side of the exhaust valve port 25. The exhaust valve body 33 is attached to the upper end of the power transmission shaft 34 with a pin 35, and the power transmission shaft 34 is connected to the snap mechanism 5. The air supply valve 20 is formed by the air supply valve port 23, the air supply valve body 31, and the elevating rod 32, the exhaust valve 21 is formed by the exhaust valve port 25 and the exhaust valve body 33, and the exhaust valve is opened when the air supply valve 20 is opened. 21 is closed, and when the air supply valve 20 is closed, the exhaust valve 21 is opened.
[0017]
The snap mechanism 5 includes a float arm 51, a sub-arm 52, a compressed coil spring 53, and spring receiving members 54 and 55, and the float arm 51 is interposed via a swing shaft 56. The bracket 57 is rotatably supported. The bracket 57 is integrally attached to the side tube 7 of the sealed container 2, and the shafts 58, 59, 60 and the swing shaft 56 described above are spanned and connected. The shafts 58 and 59 also serve as upper and lower limit stoppers for the float arm 51, and the shaft 60 also serves as a stopper for the sub arm 52.
[0018]
The float arm 51 is composed of two plates opposed in parallel. A shaft 61 is attached to the left end portion of the two plates, and a connecting member 62 fixed to the float 3 by welding is rotatably attached to the shaft 61. The float 3 swings up and down around a shaft 61 supported by the float arm 51. Then, the float arm 51 swings up and down around the swing shaft 56 in conjunction with the float 3 after the float 3 swings a predetermined amount.
[0019]
The right end portion of the float arm 51 protrudes downward, and a shaft 63 parallel to the swinging shaft 56 is stretched over the tip portion, and the spring receiving member 54 is rotatably supported on the shaft 63. ing. Further, the upper end portion of the sub-arm 52 is rotatably supported by the swing shaft 56 described above. The sub-arm 52 is composed of two plates opposed in parallel, each plate having an inverted “L” shape. A shaft 64 parallel to the rocking shaft 56 and the shaft 63 is spanned on the lower end portion of the sub-arm 52, and a spring receiving member 55 is rotatably supported on the shaft 64. A compressed coil spring 53 is attached between the spring receiving members 54 and 55. A shaft 65 is stretched over the upper right end portion of the sub-arm 52, and the lower end of the power transmission shaft 34 is connected.
[0020]
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 the working fluid. First, in the external piping of the liquid pumping apparatus 1, the working fluid introduction port 15 is connected to a high-pressure steam source, and the working fluid discharge port 16 is connected to the steam circulation piping. Further, the pressure liquid inlet 13 is connected to a load such as a steam using device via a check valve (not shown) that opens from the outside toward the liquid reservoir space 12. On the other hand, the pressure liquid discharge port 14 is connected to a liquid pressure destination such as a boiler via a check valve (not shown) that opens from the liquid reservoir space 12 to the outside.
[0021]
When there is no condensate in the liquid reservoir space 12 of the liquid pumping apparatus 1 of this embodiment, the float 3 is located at the bottom as shown in FIG. At this time, the supply valve 20 in the switching valve 4 is closed and the exhaust valve 21 is opened. When condensate is generated in a load such as a steam using device, the condensate flows down from the pumped liquid inlet 13 to the liquid pumped device 1 and accumulates in the liquid reservoir space 12.
[0022]
The condensate accumulated in the liquid storage space 12 floats while the float 3 rotates clockwise about the shaft 61, floats a predetermined amount, and then the float arm 51 centers on the swing shaft 56. The shaft 63, which is a connecting portion with the coil spring 53, moves to the left and approaches the line connecting the swing shaft 56 and the shaft 64, and the coil spring 53 is compressed and deformed. Then, the float 3 further rises, the shaft 63 is aligned on the line connecting the swinging shaft 56 and the shaft 64, and the float 3 is still lifted so that the shaft 63 is connected to the line connecting the swinging shaft 56 and the shaft 64. If the coil spring 53 is also moved leftward, the coil spring 53 rapidly recovers from deformation, the sub-arm 52 rotates counterclockwise, and the shaft 64 snaps to the right. As a result, the power transmission shaft 34 connected to the shaft 65 of the sub-arm 52 snaps upward, the exhaust valve body 33 closes the exhaust valve port 30, and the exhaust valve body 33 pushes up the lifting rod 32. Thus, the air supply valve body 31 opens the air supply valve port 23.
[0023]
When the air supply valve port 23 is opened, high-pressure steam is introduced into the sealed container 2, the internal pressure rises, and the condensate accumulated in the liquid reservoir space 12 is pushed by the vapor pressure and pumped liquid discharge It is discharged from the outlet 14 to an external boiler or waste heat utilization device via a check valve (not shown).
[0024]
When the water level in the condensate reservoir space 12 is lowered as a result of discharging the condensate, the float 3 descends while rotating counterclockwise around the shaft 62, and after a predetermined amount descends, the float arm 51 Rotates counterclockwise about the swing shaft 56, the shaft 63, which is a connecting portion with the coil spring 53, moves to the right, approaches the line connecting the swing shaft 56 and the shaft 64, and the coil spring 53 is compressed. Deform. Then, the float 3 is further lowered, the shaft 63 is arranged on a line connecting the swing shaft 56 and the shaft 64, and the float 3 is further lowered so that the shaft 63 is connected from the line connecting the swing shaft 56 and the shaft 64. If the coil spring 53 is also moved to the right, the coil spring 53 rapidly recovers from deformation, the sub-arm 52 rotates clockwise, and the shaft 64 snaps to the left. As a result, the power transmission shaft 34 connected to the shaft 65 of the sub arm 52 snaps downward, the exhaust valve body 23 opens the exhaust valve port 30, and the air supply valve body 31 opens the working fluid inlet port. The supply valve port 23 is closed by the pressure on the 15th side.
[0025]
【The invention's effect】
In the liquid pressure feeding device of the present invention, the exhaust valve body is directly connected to the power transmission shaft, and the supply valve body is opened by the exhaust valve body. Therefore, there is no need for a connecting plate or the like for connecting to the switching valve. Therefore, the liquid pumping apparatus of the present invention has 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 cross-sectional view of a liquid pumping apparatus according to a specific embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a switching valve portion of FIG.
FIG. 3 is a partial cross-sectional perspective view of a conventional liquid pumping device.
4 is an enlarged cross-sectional view of the switching valve portion of FIG. 3;
[Explanation of symbols]
2 Sealed container 3 Float 4 Switching valve 5 Snap mechanism 11 Working fluid inlet 13 Working fluid outlet 16 Pressure liquid inlet 17 Pressure liquid outlet 20 Air supply valve 21 Exhaust valve 31 Supply valve body 33 Exhaust valve body 34 Power transmission shaft

Claims (1)

A float is disposed in a sealed container having a working fluid introduction port, a working fluid discharge port, a pumping liquid inlet and a pumping liquid discharge port, and the power transmission shaft snaps and moves as the float moves up and down, and an exhaust valve and an air supply valve. First, the exhaust valve is opened, the working fluid discharge port is opened, the air supply valve is closed, the working fluid introduction port is closed, and the liquid is introduced from the pumping liquid inlet, and then the exhaust is opened. a liquid pumping apparatus for pumping liquids accumulated working fluid inlet port open closed by air supply valve the working fluid discharge port to close the valve opening to the closed vessel from the pumping liquid outlet, the air supply valve are those supply valve body to open and close the intake valve port from the working fluid inlet port side, the exhaust valve Oite to that exhaust valve member to open and close the exhaust valve port from the liquid reservoir space side, the power transmission shaft the exhaust valve body directly connected, the air supply valve element above the exhaust valve member Location and, a liquid pumping device being characterized in that so as to open manipulate air supply valve body with the exhaust valve member by upward movement of the power transmission shaft.

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