JP5897988B2 - 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.

A conventional liquid pumping device is disclosed in Patent Document 1, for example. This is a closed vessel provided with a working steam inlet, a working steam outlet, a liquid inlet and a liquid outlet, a working valve inlet provided with a supply valve, and a working steam outlet provided with an exhaust valve, An inlet 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 pressure destination is provided at the liquid outlet, and is sealed. By operating the snap mechanism according to the raising and lowering of the float arranged in the container and snapping the power transmission shaft, the supply valve connected to the power transmission shaft and the exhaust valve are switched between opening and closing. By opening the valve and 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 reverse the pressure side. Pumping to the liquid pumping destination via a stop valve The exhaust valve includes a fixed valve seat having an exhaust valve port, an exhaust valve body that opens and closes the fixed valve seat and opens and closes the exhaust valve port, and a lifting rod that connects the exhaust valve body to the power transmission shaft. It has been done.

JP-A-8-145290

The conventional liquid pumping device described above has a low exhaust capacity due to the small opening area of the exhaust valve port that can be opened by the exhaust valve body, and the inflow of liquid into the sealed container is delayed due to the delay in opening the inflow check valve. There was a slow problem. When the flow of the liquid into the sealed container is slow, the liquid pumping capacity per unit time becomes small.

Therefore, the problem to be solved by the present invention is to provide a liquid pumping device capable of increasing the exhaust capacity and quickly opening the inflow check valve.

In order to solve the above-described problems, the liquid pumping apparatus of the present invention is provided with an operating steam inlet, an operating steam outlet, a liquid inlet and a liquid outlet in a sealed container, and an air supply valve at the operating steam inlet. Provided, an exhaust valve is provided at the working vapor outlet, an inflow check valve is provided at the liquid inlet to allow only the liquid flow to the sealed container, and the fluid flow to the liquid pressure destination is provided at the liquid outlet. A pressure check valve is provided that allows only the power transmission shaft, and the power transmission shaft is snapped by operating the snap mechanism in response to the raising and lowering of the float arranged in the sealed container, thereby supplying the power supply shaft connected to the power transmission shaft. Switch the open and close of the air valve and the exhaust valve, and first open the exhaust valve and close the air supply valve to allow liquid to flow into the sealed container through the inflow check valve, then close the exhaust valve and close the air supply valve Open the liquid accumulated in the sealed container. In the case of pressure-feeding to a liquid pressure destination via a sending-side check valve, the exhaust valve body has an exhaust valve port, an exhaust valve body that opens and closes the exhaust valve port by being attached to and detached from the mobile valve seat, A lifting / lowering rod for connecting the valve body to the power transmission shaft, a fixed valve seat having a second exhaust valve opening having a larger opening area than the exhaust valve opening and opened / closed by a moving seat, and connected to the lifting / lowering rod. And a drive member that opens the second exhaust valve port by moving the moving valve seat away from the fixed valve seat in the process of displacement in the fully open direction after the exhaust valve port is opened. is there.

According to the present invention, a moving valve seat having an exhaust valve port as an exhaust valve, an exhaust valve body that opens and closes the exhaust valve port by being seated on the moving valve seat, and a lifting rod that connects the exhaust valve body to a power transmission shaft A fixed valve seat having a second exhaust valve port having an opening area larger than that of the exhaust valve port and opened and closed by a movable valve seat, and a fully open direction after the exhaust valve port is opened by being connected to a lifting rod And a drive member that opens the second exhaust valve port by moving the moving valve seat away from the fixed valve seat in the process of displacement to the first position, and having a larger opening area than the exhaust valve port after the exhaust valve port is opened. Since the two exhaust valve ports are opened, an excellent effect is achieved in that the exhaust capacity can be increased and the inflow check valve can be quickly opened.

It is sectional drawing of the liquid pumping apparatus concerning embodiment of this invention. It is an expanded sectional view of the exhaust valve part of FIG.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 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 18 is attached inside the working fluid introduction port 11, and an exhaust valve 19 is attached inside the working fluid discharge port 13. The air supply valve 18 includes an air supply valve seat 20, an air supply valve body 21, and a lower lifting rod 22. The air supply valve seat 20 has a through hole in the axial direction, and an air supply valve port 24 is formed in the upper part of the through hole. Four openings 25 are provided in the peripheral wall of the middle portion of the air supply valve seat 20 to communicate the air supply valve port 24 with the inner side of the sealed container 2. The air supply valve body 21 is spherical and is positioned on the working fluid introduction port 11 side of the air supply valve port 24, and a lower elevating rod 22 is integrally attached to the lower end by welding. A plurality of, for example, four ribs 26 a extending around the air supply valve body 21 are formed at the lower end of the cap 26 above the air supply valve body 21. The inner surfaces of the ribs 26a are all located on concentric circles, and the diameter of the concentric circles is made slightly larger than the diameter of the air supply valve body 21, and the outer surface of the air supply valve body 21 is loosely slidably contacted, thereby Guide up and down. A cylindrical filter 23 is provided around the rib 26 a between the lower outer periphery of the cap 26 and the upper end of the air supply valve seat 20. The cylindrical filter 23 has a number of filter holes for capturing foreign substances in the fluid. The lower lifting / lowering rod 22 is slidably guided up and down by a lower guide member 20a formed of a small-diameter inner peripheral wall formed on the inner surface of the air supply valve seat 20. The lower part of the lower lifting / lowering rod 22 comes out inward of the sealed container 2 and comes into contact with the continuous plate 27. The connecting plate 27 is connected to the power transmission shaft 28, and the power transmission shaft 28 is connected to the snap mechanism 5. The exhaust valve 19 connects a moving valve seat 30 having an exhaust valve port 29, an exhaust valve body 31 that opens and closes the mobile valve seat 30 to open and close the exhaust valve port 29, and connects the exhaust valve body 31 to the power transmission shaft 28. A pin 32, a fixed valve seat 54 having a second exhaust valve port 53 having an opening area larger than that of the exhaust valve port 29 and opened and closed by the seating of the moving valve seat 30, and an exhaust valve port connected to the exhaust valve body 31 It is constituted by a pin 55 as a drive member that opens the second exhaust valve port 53 by separating the moving valve seat 30 from the fixed valve seat 54 in the process of displacement in the fully open direction after the opening 29 is opened. Four openings 56 for communicating the exhaust valve port 29 and the inner side of the sealed container 2 are provided on the peripheral wall of the intermediate portion of the moving valve seat 30. The switching valve 4 is constituted by the air supply valve 18 and the exhaust valve 19. When the air supply valve 18 is opened, the exhaust valve 19 is closed, and when the air supply valve 18 is closed, the exhaust valve 19 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.

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 air supply valve 18 in the switching valve 4 is closed and the exhaust valve 19 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 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 connecting shaft 45 snaps upward, the air supply valve body 21 is separated from the air supply valve seat 20, the air supply valve port 24 is opened, and the air supply valve 18 is opened. The exhaust valve body 31 is seated on the moving valve seat 30 and the exhaust valve port 29 is closed, and the moving valve seat 30 is seated on the fixed valve seat 54 and the second exhaust valve port 53 is closed and the exhaust valve 19 is opened. Is closed.

When the air supply valve 18 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 is vapor pressure. 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 connected to the connecting shaft 45 snaps downward, the air supply valve body 21 is seated on the air supply valve seat 20, the air supply valve port 24 is closed, and the air supply valve 18 is closed. While being closed, the exhaust valve body 31 is separated from the moving valve seat 30 to open the exhaust valve port 29, and the moving valve seat 30 is separated from the fixed valve seat 54 in the process of displacement in the fully open direction, so that the second exhaust is performed. The valve port 53 is opened and the exhaust valve 19 is opened.

  The present invention is not limited to a condensate pressure feeding device that sends condensate generated in various steam using devices to a boiler or a waste heat utilization place, but can also be used in a liquid pressure feeding device that pumps liquid such as hot water or fuel.

DESCRIPTION OF SYMBOLS 1 Liquid pumping apparatus 2 Sealed container 3 Float 4 Switching valve 5 Snap mechanism 10 Liquid storage space 11 Working fluid inlet 13 Working fluid outlet 16 Liquid inlet 17 Liquid outlet 18 Air supply valve 19 Exhaust valve 20 Air supply valve seat 21 Supply valve body 22 Lower lift rod 24 Supply valve port 28 Power transmission shaft 29 Exhaust valve port 30 Moving valve seat 31 Exhaust valve body 32 Lift rod 53 Second exhaust valve port 54 Fixed valve seat 55 Pin

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. In what is pumped to the liquid pumping destination The exhaust valve has an exhaust valve port, a moving valve seat, an exhaust valve body that opens and closes the moving valve seat, opens and closes the exhaust valve port, a lifting rod that connects the exhaust valve body to the power transmission shaft, and an exhaust valve port A fixed valve seat that has a second exhaust valve opening with a large opening area and is opened and closed by the seating of the moving valve seat, and moves in the process of displacement in the fully open direction after the exhaust valve opening is connected to the lifting rod A liquid pumping device comprising: a drive member that separates the valve seat from the fixed valve seat and opens the second exhaust valve port.

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