JP4994966B2 - 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 a conventional liquid pumping device, a closed container is provided with a working steam inlet, a working steam outlet, a liquid inlet and a liquid outlet, a supply valve is provided at the working steam inlet, and an exhaust valve is provided at the working steam outlet. An inlet check valve that allows only the flow of liquid to the sealed container at the liquid inlet, and a pressure check valve that allows only the fluid flow to the liquid destination at the liquid outlet. By switching the power supply shaft and the exhaust valve connected to the power transmission shaft by switching the power transmission shaft by snapping the power transmission shaft by operating the snap mechanism according to the lift of the float arranged in the sealed container First, the exhaust valve is opened and the air supply valve is closed to allow the liquid to flow into the sealed container through the inflow side check valve. Then, the liquid accumulated in the sealed container is closed by closing the exhaust valve and opening the air supply valve. To the liquid pumping destination via the check valve on the pumping side. It is intended to send.

When the above-mentioned conventional liquid pumping device opens the exhaust valve and closes the air supply valve, the condensate in the sealed container re-evaporates, so it takes time to exhaust the steam in the sealed container, and the inflow side check valve However, there was a problem that the flow of liquid into the sealed container was slow due to the delay of the valve opening. If the flow of the liquid into the sealed container is slow, the liquid pumping capacity per unit time becomes small.
JP-A-8-145290

  The problem to be solved is to provide a liquid pumping device that can quickly open the inflow side check valve and prevent re-evaporation of the condensate in the sealed container when the exhaust valve is opened and the air supply valve is closed. It is.

In the present invention, the closed vessel is provided with a working steam inlet, a working steam outlet, a liquid inlet and a liquid outlet, a supply valve is provided at the working steam inlet, and an exhaust valve is provided at the working steam outlet. The liquid inlet has an inflow check valve that allows only the flow of liquid to the sealed container, and the liquid discharge port has a pressure check valve that only allows the flow of fluid to the liquid pressure destination. By operating the snap mechanism in response to the lifting and lowering of the float arranged in the sealed container and snapping the power transmission shaft, the supply valve and exhaust valve connected to the power transmission shaft are switched between opening and closing. Opening the exhaust valve and closing the air supply valve causes the liquid to flow into the sealed container via the inflow side check valve, and then closing the exhaust valve and opening the air supply valve causes the liquid accumulated in the sealed container to be pumped. Liquid to be pumped to liquid pumping destination via check valve In feeding device, and drives to open the inlet-side check valve in the power transmission shaft when closing the air supply valve to open the exhaust valve by a snap movement of the power transmission shaft.

  In the present invention, when the exhaust valve is opened and the air supply valve is closed, the inflow check valve is quickly opened to exhaust the vapor in the sealed container in a short time, thereby allowing the liquid to quickly flow into the sealed container. This produces an excellent effect that the liquid pumping capacity per unit time can be increased.

  The liquid pumping device of the present invention is driven to open the inflow check valve on the power transmission shaft when the exhaust valve is opened and the air supply valve is closed by snap movement of the power transmission shaft. Therefore, when the exhaust valve is opened and the air supply valve is closed, the inflow check valve can be opened quickly, and the condensate in the sealed container is replaced by replacing the vapor in the sealed container with the liquid on the liquid inlet side. Re-evaporation can be prevented. Therefore, the vapor in the sealed container can be exhausted in a short time to allow the liquid to flow into the sealed container quickly.

  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 steam inlet 11, a working steam outlet 13, a liquid inlet 16, and a liquid outlet 17.

An intake valve 20 is attached inside the working steam inlet 11, and an exhaust valve 21 is attached inside the working steam outlet 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 the middle 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 steam inlet 11. The valve body 23 is spherical and is on the working steam inlet 11 side, and is opened and closed when the upper end of the elevating rod 24 contacts. 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 makes contact and opens and closes. Is. The lower end of the elevating bar 31 is connected to the power transmission shaft 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, 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 that is parallel to the swing shaft 35 is attached to the right end 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. 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.

  An inflow check valve 60 that opens from the outside toward the liquid storage space 10 is provided at the liquid inlet 16 connected to a load such as a steam using device. A pressure-feed-side check valve 61 that opens from the liquid reservoir space 10 to the outside is provided at the liquid discharge port 17 connected to a liquid pressure-feed destination such as a boiler. The inflow side check valve 60 is located inside the liquid inflow port 16, and the upper part is attached to the lid portion 8 so as to be rotatable by a pin 62. A right extension extending rightward is formed at the upper end of the inflow check valve 60, and a lower extension extending downward is formed at the right end of the connecting plate 27. The lower surface of the lower extension of the connecting plate 27 is in contact with the upper surface of the right extension of the inflow side check valve 60. Therefore, when the exhaust valve 21 is opened and the air supply valve 20 is closed by the snap movement of the power transmission shaft 28, the inflow side check valve 60 is driven to be opened. Further, when the exhaust valve 21 is closed by the snap movement of the power transmission shaft 28 and the air supply valve 20 is opened, the inflow side check valve 60 is closed.

  Next, the operation of the liquid pumping apparatus 1 of this embodiment will be described. First, the external piping of the liquid pumping apparatus 1 has a working steam inlet 11 connected to a high-pressure steam source, and a working steam discharge port 13 connected to a steam circulation pipe. The liquid inlet 16 is connected to a load such as a steam using device, and the liquid outlet 17 is connected to a liquid pressure destination such as a boiler.

  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 inflow side check valve 60 is opened, and the pressure-feed side check valve 61 is closed. 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.

  When the air supply valve 20 is opened and the working steam inlet 11 is opened, high-pressure steam is introduced into the sealed container 2, the internal pressure rises, the inflow check valve 60 is closed, and the pump-side reverse The stop valve 61 is opened. The condensate collected in the liquid storage space 10 is pushed by the vapor pressure and discharged from the pumped liquid discharge port 17 to the external boiler or the waste heat utilization device through the pumping side check valve 61. 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 connected to the connection shaft 45 snaps downward, the supply valve 20 is closed, the exhaust valve 21 is opened, and the inflow side check valve 60 is opened. When the supply valve 20 is closed, the exhaust valve 21 is opened, and the inflow side check valve 60 is opened, the condensate in the sealed container is replaced by the replacement of the steam in the sealed container 2 and the condensate on the liquid inlet 16 side. Re-evaporation is prevented. Thereby, the vapor | steam in the airtight container 2 can be exhausted in a short time, and a liquid can be made to flow in into the airtight container 2 quickly.

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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid pumping apparatus 2 Airtight container 3 Float 4 Switching valve 5 Snap mechanism 10 Liquid storage space 11 Working steam inlet 13 Working steam outlet 16 Liquid inlet 17 Liquid outlet 20 Supply valve 21 Exhaust valve 28 Power transmission shaft 60 Inflow Side check valve 61 Pressure-feed side check valve

Claims (1)

The closed container is provided with a working steam inlet, a working steam outlet, a liquid inlet and a liquid outlet, a supply valve is provided at the working steam inlet, an exhaust valve is provided at the working steam outlet, and a liquid inlet An inlet check valve that allows only the flow of liquid to the sealed container is provided, and a pressure check valve that allows only the flow of fluid to the liquid pressure destination is provided at the liquid discharge port. The power transmission shaft is snapped by operating the snap mechanism according to the rise and fall of the arranged float, thereby switching the supply valve and exhaust valve connected to the power transmission shaft to open and close, and then opening the exhaust valve first. By closing the air supply valve, the liquid flows into the sealed container via the inflow side check valve, and then closing the exhaust valve and opening the air supply valve causes the liquid accumulated in the sealed container to flow through the pressure side check valve. A liquid pumping device that pumps to a liquid pumping destination There, the liquid pumping apparatus, characterized in that the drive to open the inlet-side check valve in the power transmission shaft when closing the air supply valve to open the exhaust valve by a snap movement of the power transmission shaft.

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