JP5001072B2 - 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 inflow check valve that allows only the flow of liquid to the sealed container is provided at the liquid inlet, and a pressure check valve that allows only the flow of fluid to the liquid discharge destination is provided at the liquid discharge port. 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. The liquid pressure destination through the pressure check valve It is intended to pumping.

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 a liquid pumping device capable of quickly opening the inflow side check valve by preventing the re-evaporation of the condensate in the sealed container when the exhaust valve is opened and the air supply valve is closed. Is to provide.

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, a cooling water inlet provided in a sealed container, cooling water inlet water injection valve for opening and closing the connecting to the power transmission shaft, a cooling water inlet of the water injection valve when closed open air supply valve exhaust valve Is opened, cooling water is poured into the sealed container, and when the exhaust valve is closed and the air supply valve is opened, the water injection valve of the cooling water inlet is closed.

  In the present invention, when the exhaust valve is opened and the air supply valve is closed, the inflow check valve can be quickly opened to allow the liquid to quickly flow into the sealed container. This produces an excellent effect that it can be enlarged.

  The liquid pumping device of the present invention has a cooling water injection port provided in a sealed container, a water injection valve that opens and closes the cooling water injection port is connected to the power transmission shaft, the cooling water injection is performed when the exhaust valve is opened and the air supply valve is closed. When the water injection valve at the inlet is opened, the exhaust valve is closed, and the air supply valve is opened, the water injection valve at the cooling water inlet is closed. Therefore, when the exhaust valve is opened and the air supply valve is closed, re-evaporation of the condensate in the sealed container can be prevented by the cooling water injected from the cooling water inlet. Therefore, the in-stream check valve can be quickly opened by exhausting the steam in the sealed container in a short time.

  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, a liquid outlet 17, and a cooling water inlet 18.

An air supply valve 20 is attached inside the working steam inlet 11, an exhaust valve 21 is attached inside the working steam outlet 13, and a water injection valve 50 is attached inside the cooling water inlet 18. 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 water injection valve 50 includes a valve case 51, a valve body 52, and an elevating rod 53. The valve case 51 has a through hole in the axial direction, and has a valve seat 54 inside the through hole. The valve body 52 held and fixed to the upper end of the elevating rod 53 from below the valve seat 54 contacts and opens and closes. Is. The lower end of the elevating bar 53 is connected to the connecting plate 27. The switching valve 4 is constituted by the air supply valve 20 and the exhaust valve 21. When the air supply valve 20 is opened, the exhaust valve 21 and the water injection valve 50 are closed, and when the air supply valve 20 is closed, the exhaust valve 21 and the water injection valve 50 are 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 55 and 56 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. 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 inflow port 16 is connected to a load such as a vapor using device via an inflow check valve 60 that opens from the outside toward the liquid reservoir space 10, and the liquid discharge port 17 is pressure-fed open from the liquid reservoir space 10 toward the outside. It is connected to a liquid pumping destination such as a boiler via a side check valve 61. The cooling water inlet 18 is connected to a water pipe.

  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. Moreover, the water injection valve 50 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 through the inflow side check valve 60 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, the air supply valve 20 is opened, the exhaust valve 21 is closed, and the water injection valve 50 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, and the condensate accumulated in the liquid reservoir space 10 is vapor pressure. And is discharged from the pressure liquid discharge port 17 to the external boiler or the waste heat utilization device via the pressure 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 air supply valve 20 is closed, the exhaust valve 21 is opened, and the water injection valve 50 is opened. When the water injection valve 50 is opened and the cooling water inlet 18 is opened, the cooling water is injected into the sealed container 2 and recondensation of the condensate in the sealed container 2 is prevented. Thereby, the vapor | steam in the airtight container 2 is exhausted for a short time, and the inflow side check valve 60 is opened 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 Sealed 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 18 Cooling water inlet 20 Supply valve 21 Exhaust valve 28 Power transmission shaft 50 Water injection valve 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 are, a cooling water inlet provided in a sealed container, the water injection valve for opening and closing the cooling water inlet is connected to the power transmission shaft, the water injection valve is opened the cooling water inlet when closed air supply valve to open the exhaust valve A liquid pumping device characterized in that when the cooling water is poured into the sealed container and the exhaust valve is closed and the air supply valve is opened, the water injection valve of the cooling water inlet is closed.

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