JP5085211B2 - 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. A float and a snap mechanism are provided in the sealed container, and the snap mechanism is supported by the float arm, a swing shaft supported in the sealed container, a float arm and a sub arm rotating around the swing shaft, and the float arm. And a second shaft supported by the sub-arm, and a spring attached between the first and second shafts, the float being connected to the float arm, The exhaust valve is connected to the sub arm via the power transmission shaft. , By operating the snap mechanism in response to the lifting and lowering of the float, the sub arm is snapped to switch between the opening and closing of the air supply valve and the exhaust valve. The liquid is allowed to flow into the sealed container through the stop valve, and then the exhaust valve is closed and the air supply valve is opened to pump the liquid accumulated in the sealed container to the liquid pumping destination through the pressure check valve. is there.

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. A float and a snap mechanism are incorporated in the sealed container. The snap mechanism includes a swing shaft supported in the sealed container, a float arm and a sub arm rotating around the swing shaft, and a first supported by the float arm. 1, a second shaft supported by the sub-arm, and a spring attached between the first and second shafts, the float is connected to the float arm, and the air supply valve and the exhaust valve are It is connected to the sub arm via the power transmission shaft and floats. By operating the snap mechanism in response to the elevation, the sub arm is snapped to switch between opening and closing of the air supply valve and exhaust valve, and by opening the exhaust valve and closing the air supply valve, the inflow check valve is opened. In the liquid pumping device that pumps the liquid accumulated in the sealed container by closing the exhaust valve and then opening the air supply valve to the liquid pumping destination via the pressure check valve, When the exhaust valve is opened by the snap movement of the sub arm and the air supply valve is closed, the upper end of the sub arm abuts the lower end of the inflow check valve so that the sub arm opens the inflow check valve. It is characterized by.

  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 side check valve by the sub arm when the exhaust valve is opened by the snap movement of the sub arm and the air supply valve is closed. 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 hemispherical, is on the working steam inlet 11 side, and is integrally attached to the upper end of the elevating rod 24. 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 lever 34 and a shaft 35, and the snap mechanism 5 is supported by a bracket 38 via a swing shaft 37. The bracket 36 and the bracket 38 are coupled by a screw (not shown) and are integrally attached to the lid portion 8 of the sealed container 2. The lever 34 is formed by bending a plate into a “U” shape, the two plates are opposed in parallel, and the float 3 is coupled to the bent portion. A shaft 40 is attached to the other end of the lever 34. The bracket 36 is composed of two “L” -shaped plates, and the shaft 35 and the shafts 41 and 42 are spanned and connected. The float 3 rotates about the shaft 35. The shafts 41 and 42 also serve as upper and lower limit stoppers for the float 3. Similarly, the bracket 38 is also composed of two “L” -shaped plates, and the swing shaft 37 and the shaft 43 are stretched over and connected. The shaft 43 also serves as a stopper for the sub arm 52 described below.

  The snap mechanism 5 includes a float arm 51, a sub arm 52, a compressed coil spring 54, a spring receiving member 55, and a spring receiving member 56. The float arm 51 is composed of two plates facing each other in parallel, and a groove 57 is provided at the left end of the two plates. The shaft 40 of the lever 34 is fitted in the groove 57 of the float arm 51. The float arm 51 is rotatably supported by the swing shaft 37 at the right end. Therefore, the float arm 51 follows up and down of the float 3 and swings up and down around the swing shaft 37. A right end portion of the float arm 51 is expanded downward, and a first shaft 58 parallel to the swing shaft 37 is spanned on the lower end portion thereof, and the spring receiving member 55 is rotatably supported by the first shaft 58. ing. An intermediate portion of the sub arm 52 is rotatably supported on the swing shaft 37. The sub arm 52 includes two plates facing each other in parallel, and a swing shaft 37 and a second shaft 59 parallel to the first shaft 58 are spanned on the lower end portion, and the spring receiving member 56 is a second member. The shaft 59 is rotatably supported. A compressed coil spring 54 is attached between the spring receiving members 55 and 56. A shaft 60 is stretched over the middle left end of the sub arm 52, and the lower end of the power transmission shaft 28 is connected. A window 61 is opened in the float arm 51 so as not to hinder the movement of the shaft 60.

  An inflow check valve 62 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 63 that opens outward from the liquid reservoir space 10 is provided at the liquid discharge port 17 connected to a liquid pressure-feed destination such as a boiler. The inflow side check valve 62 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 64. A left extension extending in the left direction is formed at the lower end of the inflow side check valve 62, and the upper end of the sub arm 52 is in contact with the lower surface of the left extension. Therefore, when the exhaust valve 21 is opened via the power transmission shaft 28 by the snap movement of the sub arm 52 and the air supply valve 20 is closed, the inflow side check valve 62 is driven to be opened. Further, when the exhaust valve 21 is closed via the power transmission shaft 28 by the snap movement of the sub arm 52 and the air supply valve 20 is opened, the inflow side check valve 62 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 62 is opened, and the pressure-feed side check valve 63 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 storage space 10, the lever 34 rotates clockwise about the shaft 35, and the float 40 moves in conjunction with the downward movement of the shaft 40 due to the rotation of the lever 34. The arm 51 rotates counterclockwise about the swing shaft 37, and the first shaft 58, which is a connecting portion with the coil spring 54, moves to the right to connect the swing shaft 37 and the second shaft 59. As the wire approaches the wire, the coil spring 54 is compressed and deformed. Then, the float 3 further rises, the first shaft 58 is aligned on the line connecting the swing shaft 37 and the second shaft 59, and the float 3 is still lifted so that the first shaft 58 is moved from the swing shaft 37 to the first shaft. When the coil spring 54 is moved to the right from the line connecting the two shafts 59, the coil spring 54 rapidly recovers from the deformation, and the sub arm 52 snaps in the clockwise direction. As a result, the valve shaft operating rod 28 connected to the shaft 60 of the sub arm 52 moves upward, 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 62 is closed, and the pump-side reverse The stop valve 63 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 decreases due to the discharge of the condensate, the float 3 descends, the lever 34 rotates counterclockwise around the shaft 35, and the lever 40 rotates upward to the shaft 40. In conjunction with the movement, the float arm 51 rotates clockwise about the swing shaft 37, and the first shaft 58, which is a connecting portion with the coil spring 54, moves to the left and the swing shaft 37 and the first shaft The coil spring 54 is compressed and deformed near the line connecting the two shafts 59. Then, the float 3 is further lowered, the first shaft 58 is arranged on a line connecting the swing shaft 37 and the second shaft 59, and the float 3 is further lowered so that the first shaft 58 is moved to the swing shaft 37 and the second shaft 59. When the coil spring 54 moves to the left from the line connecting the two shafts 59, the coil spring 54 rapidly recovers from the deformation, and the sub arm 52 snaps in the counterclockwise direction. As a result, the valve shaft operating rod 28 connected to the shaft 60 of the sub arm 52 moves downward, the air supply valve 20 is closed, the exhaust valve 21 is opened, and the inflow side check valve 62 is opened. When the air supply valve 20 is closed and the exhaust valve 21 is opened and the inflow side check valve 62 is opened, the steam in the sealed container 2 is replaced with the condensate on the liquid inlet 16 side to restore the recovery in the sealed container 2. Re-evaporation of water 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 reservoir 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 37 Swing Moving shaft 51 Float arm 52 Sub arm 54 Coil spring 58 First shaft 59 Second shaft 62 Inflow side check valve 63 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. A float and a snap mechanism are incorporated, and the snap mechanism includes a swing shaft supported in the sealed container, a float arm and a sub arm rotating around the swing shaft, and a first shaft supported by the float arm. And a second shaft supported by the sub arm, and a spring attached between the first and second shafts, the float is connected to the float arm, and the air supply valve and the exhaust valve serve as the power transmission shaft. It is connected to the sub arm via the By operating the snap mechanism and snapping the sub arm, the air supply valve and the exhaust valve are opened and closed, and the liquid is passed through the inflow check valve by first opening the exhaust valve and closing the air supply valve. In the liquid pumping device that feeds the liquid accumulated in the sealed container to the liquid pumping destination via the pressure check valve by closing the exhaust valve and opening the air supply valve, When the exhaust valve is opened by snap movement and the air supply valve is closed, the upper arm of the sub arm comes into contact with the lower end of the inflow check valve, and the sub arm is driven to open the inflow check valve. Liquid pumping device.

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