JP2011163546A - Liquid pumping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid pumping device buffering an impact when an exhaust valve element is seated on an exhaust valve port. <P>SOLUTION: A sealed vessel 2 is provided with an operating fluid introduction port 11, an operating fluid discharge port 13, a liquid inlet port 16, and a liquid discharge port 17. An air supply valve 18 is disposed to the operating fluid introduction port 11, and an exhaust valve 19 is disposed to the operating fluid discharge port 13. A snap mechanism 5 using a spring is operated to snap-move a valve stem operation rod 28, along with upward and downward movement of a float 3 disposed in the sealed vessel 2, so as to switch between open and close of the air supply valve 18 and the exhaust valve 19 through the valve stem operation rod 28. The exhaust valve 19 has an exhaust valve element 30 connected to the valve stem operation rod 28, and an exhaust valve port 32 from/on which the exhaust valve element 30 separates/is seated. The exhaust valve element 30 is connected to the valve stem operation rod 28 to be displaced in a direction separating from/seated on the exhaust valve port 32, and a coil spring 33 is disposed between the exhaust valve element 30 and the valve stem operation rod 28. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a liquid pumping device that pumps liquid such as hot water or fuel. The liquid pressure feeding device of the present invention is particularly suitable as a device for sending condensate generated in various steam using devices to a boiler or a waste heat utilization site.

A conventional liquid pumping device is disclosed in Patent Document 1, for example. This is because the closed container is provided with a working fluid inlet, a working fluid outlet, a liquid inlet and a liquid outlet, a supply valve is provided at the working fluid inlet, and an exhaust valve is provided at the working fluid outlet. By operating a snap mechanism using a spring in response to the lifting and lowering of the float placed in the sealed container, the valve shaft operating rod is snapped to open and close the supply and exhaust valves via the valve shaft operating rod. Switch and first let the liquid flow into the sealed container by opening the exhaust valve and closing the air supply valve, and then pump the liquid accumulated in the sealed container by closing the exhaust valve and opening the air supply valve. The exhaust valve has a lifting / lowering rod connected to the valve shaft operating rod, an exhaust valve body connected to the lifting / lowering rod, and an exhaust valve port through which the exhaust valve body is seated.

JP-A-8-145290

The conventional liquid pumping device has a problem that the exhaust valve body is worn or damaged relatively early because the exhaust valve body is shockedly seated on the exhaust valve port when the exhaust valve is closed. .

Therefore, the problem to be solved by the present invention is to provide a liquid pumping device capable of buffering an impact when the exhaust valve body is seated on the exhaust valve port.

In order to solve the above-described problems, in the liquid pumping apparatus of the present invention, a working container is provided with a working fluid inlet, a working fluid outlet, a liquid inlet and a liquid outlet, and an air supply valve is provided at the working fluid inlet. An exhaust valve is provided at the working fluid discharge port, and a valve shaft operating rod is snap-moved by operating a snap mechanism using a spring in response to the raising and lowering of the float arranged in the sealed container. Switch between opening and closing of the air supply valve and the exhaust valve via the operation rod. First, open the exhaust valve and close the air supply valve to allow liquid to flow into the sealed container, then close the exhaust valve and open the air supply valve. The exhaust valve body has an exhaust valve port on which the exhaust valve body is connected to the valve shaft operating rod and the exhaust valve body is attached to and detached from the exhaust valve body. The valve can be displaced in the direction of seating on and off the exhaust valve port. Operating rod to be connected, is characterized in that a spring between the exhaust valve body and valve stem operating rod are arranged.

According to the present invention, the exhaust valve has the exhaust valve body connected to the valve shaft operating rod and the exhaust valve port from which the exhaust valve body is seated, and is displaceable in the direction in which the exhaust valve body seats on the seat. Since the spring is arranged between the exhaust valve body and the valve shaft operating rod, the spring can buffer the impact when the exhaust valve body is seated on the exhaust valve port. The exhaust valve body can be prevented from being worn or damaged.

It is sectional drawing of the liquid pumping apparatus concerning embodiment of this invention. It is an expanded sectional view of the exhaust valve part of FIG.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. The liquid pumping apparatus 1 according to the present embodiment has a float 3, a switching valve 4, and a snap mechanism 5 arranged in a sealed container 2. The sealed container 2 has a main body portion 7 and a lid portion 8 connected by screws (not shown), and a liquid reservoir space 10 is formed inside. The lid 8 is provided with a working fluid introduction port 11, a working fluid discharge port 13, a liquid inflow port 16, and a liquid discharge port 17. An air supply valve 18 is attached inside the working fluid introduction port 11, and an exhaust valve 19 is attached inside the working fluid discharge port 13. The air supply valve 18 includes a valve case 20, an air supply valve body 21, and an elevating rod 22. The valve case 20 has a through hole in the axial direction, and an air supply valve port 24 is formed in the upper part of the through hole. Four openings 25 are provided on the peripheral wall of the intermediate portion of the valve case 20 to communicate the air supply valve port 24 with the inner side of the sealed container 2. The air supply valve body 21 is spherical and is positioned on the working fluid introduction port 11 side of the air supply valve port 24, and a lifting bar 22 is integrally attached to the lower end thereof by welding. An upper portion of the air supply valve body 21 is closed by a cap 26. The lower part of the lifting / lowering rod 22 comes out to the inside of the sealed container 2 and comes into contact with the continuous plate 27. The connecting plate 27 is connected to the valve shaft operating rod 28, and the valve shaft operating rod 28 is connected to the snap mechanism 5. The exhaust valve 19 includes a valve case 29 and an exhaust valve body 30. The valve case 29 has a through hole in the axial direction, and has an exhaust valve port 32 at an upper part of the through hole. The exhaust valve body 30 is seated and opened from below the exhaust valve port 32 to open and close. A lower end of the exhaust valve body 30 is connected to a valve shaft operating rod 28 by a pin so as to be displaceable in the vertical direction in which the exhaust valve body 30 is seated on and away from the exhaust valve port 32. A coil spring 33 is disposed between the exhaust valve body 30 and the valve shaft operating rod 28. The impact when the exhaust valve body 30 is seated on the exhaust valve port 32 can be buffered by the coil spring 33. The switching valve 4 is constituted by the air supply valve 18 and the exhaust valve 19. When the air supply valve 18 is opened, the exhaust valve 19 is closed, and when the air supply valve 18 is closed, the exhaust valve 19 is opened.

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 portion 8 of the sealed container 2 by screws (not shown). The snap mechanism 5 includes a float arm 34, a sub arm 37, and a coil spring 38 in a compressed state. The float arm 34 is composed of two parallel opposing plates, the float 3 is fixed to the left end, and the right side portion is rotatably supported by the swing shaft 35. Accordingly, the float 3 swings up and down around the swing shaft 35. A first shaft 39 parallel to the swing shaft 35 is stretched around the center of the float arm 34. A first spring receiving member 40 is rotatably supported on the first shaft 39. A sub arm 37 is rotatably supported on the swing shaft 35. The sub arm 37 is composed of two plates facing each other in parallel, and a second shaft 41 parallel to the swing shaft 35 is stretched over the left end portion. A second spring receiving member 42 is rotatably supported on the second shaft 41. A coil spring 38 in a compressed state is disposed between the first and second spring receiving members 40 and 42. The float arm 34 is provided with a semicircular elongated hole 43, and a stopper shaft 44 parallel to the swing shaft 35 is supported by the bracket 36 in the elongated hole 43. The stopper shaft 44 regulates the rotation range of the sub arm 37. A connecting shaft 45 parallel to the swing shaft 35 is attached to the right end portion of the sub arm 37 so as to pass therethrough, and the lower end of the valve shaft operating rod 28 is connected to the connecting shaft 45. Stopper shafts 51 and 52 that are parallel to the swing shaft 35 and restrict the swing range of the float arm 34 are supported by the bracket 36.

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 inlet 11 is connected to a high-pressure steam source, and the working fluid outlet 13 is connected to the steam circulation piping. The liquid inlet 16 is connected to a load such as a vapor using device via a check valve (not shown) that opens from the outside toward the liquid reservoir space 10, and the liquid outlet 17 is directed outward from the liquid reservoir space 10. It is connected to a liquid pumping destination such as a boiler via an open check valve (not shown). When there is no condensate in the liquid reservoir space 10 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 air supply valve 18 in the switching valve 4 is closed and the exhaust valve 19 is opened. When condensate is generated in a load such as a steam using device, the condensate flows down from the pumping liquid inlet 16 to the liquid pumping device 1 and accumulates in the liquid reservoir space 10. When the float 3 rises due to the condensate accumulated in the liquid reservoir space 10, the float arm 34 rotates clockwise about the swing shaft 35, and the first shaft 39, which is a connecting portion with the coil spring 38, moves upward. To the extension line of the line connecting the swing shaft 35 and the second shaft 41, the coil spring 38 is compressed and deformed. When the float 3 further floats and the first shaft 39 exceeds the extension of the line connecting the oscillating shaft 35 and the second shaft 41, the coil spring 38 suddenly recovers from deformation and the sub arm 37 is counterclockwise. The connecting shaft 45 is snapped upward by rotating in the turning direction. As a result, the valve shaft operating rod 28 connected to the connecting shaft 45 snaps upward, the air supply valve 18 is opened and the exhaust valve 19 is closed. At this time, the impact when the exhaust valve body 30 is seated on the exhaust valve port 32 can be buffered by the coil spring 33.

When the air supply valve 18 is opened and the working fluid inlet 11 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 10 is vapor pressure. And is discharged from the pressure 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 reservoir space 10 is lowered due to the discharge of the condensate, the float 3 descends, and the float arm 34 rotates counterclockwise about the swing shaft 35, which is a connecting portion with the coil spring 38. The first shaft 39 moves downward and approaches an extended line connecting the swing shaft 35 and the second shaft 41, and the coil spring 38 is compressed and deformed. When the float 3 further descends and the first shaft 39 exceeds the extension of the line connecting the swing shaft 35 and the second shaft 41, the coil spring 38 suddenly recovers from deformation and the sub arm 37 rotates clockwise. The connecting shaft 45 snaps downward by rotating in the direction. As a result, the valve shaft operating rod 28 connected to the connecting shaft 45 snaps downward, closing the air supply valve 18 and opening the exhaust valve 19.

  The present invention is not limited to a condensate pressure feeding device that sends condensate generated in various steam using devices to a boiler or a waste heat utilization place, but can also be used in a liquid pressure feeding device that pumps liquid such as hot water or fuel.

DESCRIPTION OF SYMBOLS 1 Liquid pumping apparatus 2 Sealed container 3 Float 4 Switching valve 5 Snap mechanism 10 Liquid reservoir space 11 Working fluid inlet 13 Working fluid outlet 16 Liquid inlet 17 Liquid outlet 18 Air supply valve 19 Exhaust valve 28 Valve shaft operating rod 30 Exhaust valve body 32 Exhaust valve port 33 Coil spring

Claims (1)

The sealed container is provided with a working fluid inlet, a working fluid outlet, a liquid inlet and a liquid outlet, a supply valve is provided at the working fluid inlet, and an exhaust valve is provided at the working fluid outlet. By operating a snap mechanism using a spring according to the lifting and lowering of the float arranged on the valve, the valve shaft operating rod is snap-moved, thereby switching between opening and closing of the air supply valve and the exhaust valve via the valve shaft operating rod, First, the liquid is allowed to flow into the sealed container by opening the exhaust valve and closing the air supply valve, and then the liquid accumulated in the sealed container is pumped to the liquid pressure destination by closing the exhaust valve and opening the air supply valve. The exhaust valve body is connected to the valve shaft operating rod, and the exhaust valve body has an exhaust valve port on which the exhaust valve body is separated and seated, and the exhaust valve body is displaceable in the direction of seating on and off the exhaust valve port. And a spring between the exhaust valve body and the valve stem operating rod. Liquid pumping apparatus characterized by being.

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