JP4607694B2 - Liquid pumping device - Google Patents

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.

  In the conventional liquid pumping device, a float is arranged in a sealed container provided with a working fluid inlet, a working fluid outlet, a liquid inlet and a liquid outlet, and a power is generated by operating a snap mechanism according to the raising and lowering of the float. By snapping the transmission shaft, the intake valve at the working fluid inlet and the exhaust valve at the working fluid outlet are switched between open and closed. First, the exhaust valve is opened and the air supply valve is closed to allow liquid to flow in from the liquid inlet. In the liquid pumping device that is in the second state in which the first state is set, the exhaust valve is closed, the air supply valve is opened, and the liquid accumulated in the sealed container is pumped from the liquid discharge port, the snap mechanism is connected to the float and A float arm that swings in response to up and down, a spring that deforms in response to the swing of the float arm, and a secondary arm that is connected to the power transmission shaft and snaps the power transmission shaft by the deformation recovery of the spring. It is intended to and a beam.

In the conventional liquid pumping device, the force for urging the power transmission shaft by the spring in the axial direction gradually decreases as the float rises or falls. Therefore, the exhaust valve closes or the air supply valve opens just before the end of the first state before the float reaches the predetermined high level, or the exhaust valve immediately before the end of the second state before the float reaches the predetermined low level. There was a problem of opening or closing of the air supply valve.
US Patent 5141405

  The problem to be solved is that the exhaust valve can be reliably opened and the supply valve can be closed until the float reaches the predetermined high level, and the exhaust valve is reliably closed and the supply valve can be opened until the float reaches the predetermined low level. It is an object to provide a liquid pumping device capable of performing the above.

According to the present invention, a float (3) is disposed in a closed container (2) provided with a working fluid inlet (11) , a working fluid outlet (13) , a liquid inlet (16), and a liquid outlet (17). Then, by operating the snap mechanism (5) in accordance with the lifting and lowering of the float (3) to snap the power transmission shaft (28) , the supply valve (20) of the working fluid inlet (11 ) and the working fluid First, the exhaust valve (21) of the discharge port (13) is switched between open and closed, the exhaust valve (21) is first opened, the air supply valve (20) is closed, and the liquid enters the liquid inflow port ( 16). Next, in the liquid pumping device (1) in the second state in which the exhaust valve (21) is closed and the air supply valve (20) is opened and the liquid accumulated in the sealed container (2) is pumped from the liquid discharge port (17). there are snap mechanism (5) is connected to the float (3) float ( ) And the float arm (34) which swings in response to the lifting of a spring (38) which depending on deformation to the swing of the float arm (34) is connected to the power transmission shaft (28) deformation of the spring (38) In addition to the spring (38), the exhaust valve (21) is opened and the air supply valve (20 ) is opened in the first state separately from the spring (38), which includes the auxiliary arm (37 ) that snaps the power transmission shaft (28) by recovery. ) Closes the exhaust valve (21) in the second state and closes the air supply valve (20) and opens the auxiliary spring (50) for urging the power transmission shaft (28) in the direction of the float arm (34) . It is provided between the swing shaft (35) and the sub arm (37) .

  According to the present invention, by providing an auxiliary spring, the exhaust valve can be reliably opened and the supply valve can be closed until the float reaches a predetermined high level, and the exhaust valve is reliably closed and the supply air can be closed until the float reaches a predetermined low level. This produces an excellent effect that the valve can be opened.

  The liquid pumping device according to the present invention assists in energizing the power transmission shaft in a direction in which the exhaust valve is opened and the supply valve is closed in the first state, and in the direction in which the exhaust valve is closed and the supply valve is opened in the second state. A spring is provided between the swing axis of the float arm and the sub arm. Therefore, the exhaust valve can be reliably opened and the supply valve can be closed in the first state until the float reaches the predetermined high level by the auxiliary spring, and the air supply valve can be reliably closed in the second state until the float reaches the predetermined low level. The exhaust valve can be closed and the supply valve can be opened.

  An embodiment showing a specific example of the above technical means will be described (see FIG. 1). 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 20 is attached inside the working fluid introduction port 11, and an exhaust valve 21 is attached inside the working fluid discharge port 13. The air supply valve 20 includes a valve case 22, a valve body 23, and an elevating rod 24. The valve case 22 has a through hole in the axial direction, and the upper end surface of the through hole functions as the valve seat 25. Four openings 26 are provided in an intermediate portion of the valve case 22 so as to communicate the above-described through holes with the outside. The tip of the valve case 22 of the air supply valve 20 is screwed into the working fluid inlet 11. The valve body 23 is spherical and is on the working fluid inlet 11 side, and is opened and closed when the upper end of the elevating rod 24 abuts. The lifting / lowering rod 24 passes through the through hole of the valve case 22 to the closed container 2 side and comes into contact with the connecting plate 27. The connecting plate 27 is connected to a power transmission shaft 28, and the power transmission shaft 28 is connected to the snap mechanism 5. The exhaust valve 21 includes a valve case 29, a valve body 30, and an elevating rod 31. The valve case 29 has a through hole in the axial direction, and has a valve seat 32 inside the through hole. The valve body 30 held and fixed to the upper end of the lifting rod 31 from below the valve seat 32 contacts and opens and closes. Is. The lower end of the elevating rod 31 is connected to the valve shaft operating rod 28 by a pin. The switching valve 4 is constituted by the air supply valve 20 and the exhaust valve 21, and when the air supply valve 20 is opened, the exhaust valve 21 is closed, and when the air supply valve 20 is closed, the exhaust valve 21 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, a compressed coil spring 38, and a compressed auxiliary coil spring 50. 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 in the elongated hole 43 by the float arm 34. The stopper shaft 44 regulates the rotation range of the sub arm 37. A third spring receiving member 47 is rotatably supported on the swing shaft 35 of the float arm 34. A connecting shaft 45 that is 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 power transmission shaft 28 is connected to the connecting shaft 45. Further, the fourth spring receiving member 49 is rotatably supported on the connecting shaft 45. A compressed auxiliary coil spring 50 is disposed between the third and fourth spring receiving members 47 and 49. The spring force of the auxiliary coil spring 50 is formed smaller than the spring force of the coil spring 38. 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 supply valve 20 in the switching valve 4 is closed and the exhaust valve 21 is opened. Further, the auxiliary coil spring 50 urges the connecting shaft 45 downward to the right, thereby urging the power transmission shaft 28 in a direction that opens the exhaust valve 21 and closes the air supply valve 20. 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 power transmission shaft 28 connected to the connection shaft 45 snaps upward, and the air supply valve 20 is opened and the exhaust valve 21 is closed. At this time, the auxiliary coil spring 50 urges the connecting shaft 45 to the upper right, thereby urging the power transmission shaft 28 in a direction to close the exhaust valve 21 and open the air supply valve 20.

  When the air supply valve 20 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 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 power transmission shaft 28 coupled to the coupling shaft 45 snaps downward, closing the air supply valve 20 and opening the exhaust valve 21.

Sectional drawing of the liquid pumping apparatus of the Example of this invention.

Explanation of symbols

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 20 Air supply valve 21 Exhaust valve 28 Power transmission shaft 34 Float Arm 35 Oscillating shaft 37 Sub arm 38 Coil spring 50 Auxiliary coil spring

Claims (1)

Float (3) is disposed in the working fluid inlet port (11) and the working fluid discharge port (13) and the liquid inlet (16) and the sealed container (2) in the liquid outlet (17) is provided, the float ( 3) By operating the snap mechanism (5) in accordance with the elevation and lowering of the power transmission shaft (28) , the supply valve (20) and the working fluid discharge port (13 ) of the working fluid introduction port (11) are moved. ) Of the exhaust valve (21) is switched, the exhaust valve (21) is first opened and the air supply valve (20) is closed to enter the first state in which liquid flows in from the liquid inlet (16) , and then the exhaust valve A liquid pumping device (1) in a second state in which (21) is closed and the air supply valve (20) is opened and the liquid accumulated in the sealed container (2) is pumped from the liquid discharge port (17). mechanism (5) is connected to the float (3) lifting the float (3) Depending the float arm (34) which swings, the spring (38) which depending on deformation to the swing of the float arm (34), power transmission by deformation recovery of the spring is connected to the power transmission shaft (28) (38) In the device including the sub arm (37 ) for snapping the shaft (28) , the exhaust valve (21) is opened and the air supply valve (20) is closed in the first state, separately from the spring (38). In the second state, the auxiliary spring (50) for urging the power transmission shaft (28) in the direction to close the exhaust valve (21) and open the air supply valve (20) in the second state is used as the swinging shaft of the float arm (34) ( 35) A liquid pumping device (1), which is provided between the sub arm (37 ) and the sub arm (37 ) .

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