JP2009257163A - Liquid force feed device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid force feed device capable of quickly opening a flow-in side check valve by preventing re-evaporation of condensate in a closed vessel when an air-discharge valve is opened and an air-feeding valve is closed. <P>SOLUTION: The device includes in a liquid flow-in port 16 a flow-in side check valve 60 allowing the flow of liquid to a closed vessel 2 only, in a liquid discharge port 17 a force-feed side check valve 61 allowing the flow of liquid to a liquid force-feed destination only, a cooling water filling port 65 in the force-feed side check valve 61, and in the cooling water filling port 65 a filling side check valve 68 allowing the flow of liquid to the closed vessel 2 only. The cooling water filling port 65 is connected to a cooling water source having a pressure lower than the pressure on the liquid force-feed destination side to which the liquid discharge port 17 is connected with a pressure higher than the pressure on a load side connected with the liquid flow-in port 16. When an air-discharge valve 21 of an operation vapor discharge port 13 is opened, the air-feeding valve 20 of the operation vapor introduction port 11 is closed, and the force-feed side check valve 61 is closed, the filling side check valve 68 is opened before the flow-in side check valve 60 is opened. <P>COPYRIGHT: (C)2010,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.

  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. First, the exhaust valve is opened and the air supply valve is closed to allow liquid to flow into the sealed container through the inflow side check valve, and then the exhaust valve is closed and the air supply valve is opened to collect the liquid in the sealed container. The liquid is pumped to the liquid pumping destination via the pumping side check valve.

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. When 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. First, the exhaust valve is opened and the air supply valve is closed to allow the liquid to flow into the sealed container via the inflow side check valve, and then the liquid accumulated in the sealed container is closed by closing the exhaust valve and opening the air supply valve. In a liquid pumping device that pumps to a liquid pumping destination via a pumping-side check valve, a cooling water inlet is provided in the pumping-side check valve, and the liquid outlet is higher than the pressure on the load side to which the liquid inlet is connected. Cooling water to a cooling water source with a pressure lower than the pressure on the liquid pressure destination side to which the The inlet side is connected, and a water-injection check valve that allows only the flow of fluid to the airtight container is provided at the cooling water inlet, the exhaust valve is opened, the air supply valve is closed, and the pumping side check valve is closed. The water injection side check valve is opened prior to the check valve.

  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 is provided with a cooling water inlet on the pumping check valve, and is higher than the pressure on the load side to which the liquid inlet is connected, and from the pressure on the liquid pumping destination side to which the liquid outlet is connected. In addition, the cooling water inlet is connected to a low-pressure cooling water source, and a water-injection check valve that allows only the flow of fluid to the sealed container is provided at the cooling water inlet. When the stop valve is closed, the water injection side check valve is opened prior to the inflow side check valve. Therefore, when the exhaust valve is opened, the air supply valve is closed, and the pressure-feed-side check valve is closed, the re-evaporation of the condensate in the sealed container can be prevented by the cooling water injected from the cooling water inlet. Therefore, it is possible to quickly open the inflow check valve 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 FIGS. 1 and 2). 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 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, 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.

  The liquid inflow port 16 is connected to a load such as a steam using device via an inflow side check valve 60 that opens from the outside toward the sealed container 2. The liquid discharge port 17 is connected to a liquid pumping destination such as a boiler through a pressure-feeding check valve 61 that opens from the sealed container 2 toward the outside. The valve case of the pressure-feed side check valve 61 is formed by an inlet / outlet member 62 and end members 63 and 64 that are screwed to the inlet / outlet member 62. A cooling water inlet 65 is formed in the end member 63. The lower end surface of the end member 63 functions as a valve seat 66. The valve seat 66 is opened and closed by contacting a disk-shaped water injection side check valve 68 urged upward by a coil spring 67 from below. A plurality of ribs 69 that slide and guide the water injection side check valve 68 are formed on the inner wall of the inlet / outlet member 62, and a fluid passage is formed between the ribs 69. Further, one end of the coil spring 67 is held at the stepped portion of the rib 69. The water injection side check valve 68 allows the flow from the cooling water inlet 65 to the sealed container 2 and stops the flow in the opposite direction. The pressure on the cooling water inlet 65 side is equal to the pressure on the sealed container 2 side and the coil spring 67. Opens when the elastic force is overcome. A valve seat 70 is formed in the lower part of the entrance / exit member 62. The valve seat 70 is opened and closed by contacting a disk-like pressure-feed side check valve body 72 urged upward by a coil spring 71 from below. A plurality of ribs 73 are formed on the inner wall of the inlet / outlet member 62 to slide and guide the pressure-feed-side check valve body 72, and a fluid passage is formed between the ribs 73. One end of the coil spring 71 is held by a plurality of ribs 74 formed on the inner wall of the end member 64. The pressure-feed-side check valve body 72 allows the flow from the sealed container 2 side to the liquid pressure-destination and stops the flow in the opposite direction. The pressure on the sealed container 2 side is the pressure on the liquid pressure-destination side and the elasticity of the coil spring 71. Open when you overcome the power.

  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 steam using device via an inflow side check valve 60 that opens from the outside toward the sealed container 2, and the liquid discharge port 17 opens from the sealed container 2 to the outside on the pumping side reverse side. It is connected to a liquid pumping destination such as a boiler via a stop valve 61. The coolant inlet 65 is connected to the liquid outlet 17 via a water injection check valve 68 that opens from the outside toward the sealed container 2 at a pressure higher than the pressure on the load side to which the liquid inlet 16 is connected. It is connected to a cooling water source whose pressure is lower than the pressure on the pressure destination side.

  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. 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, the pressure feeding side check valve 61 is closed, and the water injection side check valve 68 is opened. When condensate is generated in a load such as a steam using device, the condensate flows down from the 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 side check valve 60 is closed, and the water injection side reverse The stop valve 68 is closed, and the pressure-feed-side check valve 61 is opened. The condensate collected in the liquid storage space 10 is pushed by the vapor pressure and discharged from the liquid discharge port 17 to the external boiler or waste heat utilization device via the pressure-feeding 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 coupled to the coupling shaft 45 snaps downward, closing the air supply valve 20 and opening the exhaust valve 21. When the air supply valve 20 is closed and the exhaust valve 21 is opened, the pressure-feed side check valve 61 is closed and the water injection side check valve 68 is opened. When the water injection side check valve 68 is opened and the cooling water inlet 65 is opened, 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. Sectional drawing of the pressure-feed-side check valve of FIG.

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 Pump side check valve 65 Cooling water inlet 68 Water injection 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. Open the air supply valve and close the air supply valve to allow the liquid to flow into the sealed container, then close the exhaust valve and open the air supply valve to open the air supply valve, and the liquid accumulated in the airtight container will be pressurized side check In a liquid pumping apparatus that pumps to a liquid pumping destination via a valve, a cooling water inlet is provided in the pumping check valve, and the liquid outlet is connected at a pressure higher than the pressure on the load side to which the liquid inlet is connected. Connect the cooling water inlet to a cooling water source whose pressure is lower than the pressure on the liquid pressure destination side. In addition, a water-inflow check valve that allows only the flow of fluid to the sealed container is provided at the cooling water inlet, and when the exhaust valve is opened, the air supply valve is closed, and the pressure-feed side check valve is closed, the inflow side check valve The liquid pumping device is characterized in that the water injection side check valve is opened prior to the injection.

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