JP5956897B2 - 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 because the sealed container is provided with a working fluid inlet, a working fluid outlet, a liquid inlet and a liquid outlet, a lever float and a switching valve are built in the sealed container, and the lever float can swing in the sealed container A U-shaped lever attached to the bridge, a connecting member fixed to the bridge portion of the U-shaped lever by welding, and a float that is connected to the connecting member and rises and falls according to the liquid level in the sealed container. The switching valve switches between opening and closing the intake valve port of the working fluid introduction port and the exhaust valve port of the working fluid discharge port according to the height of the liquid level accumulated in the tank. The liquid is introduced from the liquid inflow port by closing the port, and then the exhaust valve port is closed and the air supply valve port is opened to pump the liquid accumulated in the sealed container from the liquid discharge port.

JP-A-8-145290

The conventional liquid pumping device has a problem that when the liquid suddenly flows into the sealed container by a water hammer or the like, the fixing portion of the U-shaped lever and the connecting member is broken and the connecting member is detached from the U-shaped lever. There was a point.

Therefore, the problem to be solved by the present invention is to provide a liquid pumping device that can prevent the connecting member from coming off the U-shaped lever.

In order to solve the above-mentioned problems, the liquid pumping device of the present invention is provided with a working fluid inlet, a working fluid outlet, a liquid inlet and a liquid outlet in a sealed container, and a lever float and a switching valve in the sealed container. The lever float has a U-shaped lever swingably mounted in the sealed container, a connecting member fixed to the bridging portion of the U-shaped lever by welding and the connecting member to penetrate the U-shaped lever. It consists of a suspension member that is suspended on opposite plates and a float that is connected to the coupling member and rises and falls according to the liquid level in the sealed container. In response, the switching valve switches between opening and closing the intake valve port of the working fluid introduction port and the exhaust valve port of the working fluid discharge port. First, the exhaust valve port is opened, the supply valve port is closed, and the liquid flows in from the liquid inlet. Then close the exhaust valve port and open the air supply valve port. The liquid accumulated in the closed container is characterized in that the pumping from the liquid discharge port.

According to the present invention, the connecting member fixed to the bridging portion of the U-shaped lever by welding is hung on the opposite plates of the U-shaped lever by the extending member penetrating the connecting member. Even if the liquid suddenly flows into the sealed container by a water hammer or the like, it is possible to prevent stress from concentrating on the fixing portion and to prevent the fixing portion between the U-shaped lever and the connecting member from being damaged. There is an effect that the lever does not come off.

It is sectional drawing of the liquid pumping apparatus concerning embodiment of this invention. It is an expanded sectional view of the connection part of the float and U-shaped lever of FIG.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. The liquid pumping apparatus 1 of the present embodiment has a lever float 6, a switching valve 4, and a snap mechanism 5 disposed 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 a valve case 20, a spherical air supply valve body 21, and an elevating rod 22. The valve case 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 26 are provided in the peripheral wall of the middle portion of the valve case 20 to communicate the air supply valve port 24 with the inner side of the sealed container 2. The spherical air supply valve body 21 is located on the working fluid introduction port 11 side of the air supply valve port 24, and is fixed to the lifting rod 22 penetrating the air supply valve port 24 by welding. The lower part of the lifting / lowering rod 22 comes out to the inside of the sealed container 2 and comes into contact with the continuous plate 27. The connecting plate 27 is connected to the valve shaft operating rod 28, and the valve shaft operating rod 28 is connected to the snap mechanism 5. The exhaust valve 19 includes a valve case 29, an exhaust valve body 30, and a lifting rod 31. The valve case 29 has a through hole in the axial direction, and has an exhaust valve port 32 at the upper part of the through hole. The exhaust valve body 30 held and fixed to the upper end of the elevating rod 31 from below the exhaust valve port 32 abuts. Open and close. 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 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 lever float 6 is connected to the float 3 that rises and falls according to the liquid level in the sealed container 2, the inner mounting member 62 fixed to the inner surface of the float 3 by welding, and the inner mounting member 62 by screw connection. An attachment member 63 fixed to the outer surface of the float 3 by welding, a U-shaped lever 34 that is swingably attached to the sealed container 2 by a shaft 35, and a bridge portion 34 a of the U-shaped lever 14 by welding. A bolt 64 as a connecting member that is fixedly connected to the mounting member 63 via a washer 65 by screw connection, and a spanning member that passes through the bolt 64 and is stretched between opposing plates of the U-shaped lever. And a spanning shaft 66. The float 3 is supported by a bracket 36 via a U-shaped 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 U-shaped lever 34 is made by bending a plate into a U-shape, the two plates face each other in parallel, and the float 3 is coupled to the bent bridge portion 34a. A shaft 40 is attached to the other end of the U-shaped 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 made of two L-shaped plates, and the swinging shaft 37 and the shaft 43 are spanned 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 U-shaped 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 upper end portion of the sub arm 52 is rotatably supported on the swing shaft 37. The sub arm 52 is composed of two plates opposed in parallel, and each plate has an inverted L shape. A swinging shaft 37 and a second shaft 59 parallel to the first shaft 58 are stretched around the lower end portion of the sub arm 52, and the spring receiving member 56 is rotatably supported by the second shaft 59. A compressed coil spring 54 is attached between the spring receiving members 55 and 56. A shaft 60 is stretched over the upper left end of the sub arm 52, and the lower end of the valve shaft operating rod 28 is connected. A window 61 is opened in the float arm 51 so as not to hinder the movement of the shaft 60.

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 such that the spherical air supply valve body 21 closes the air supply valve port 24, and the exhaust valve 19 has the exhaust valve body 30 opened the exhaust valve port 32. 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 U-shaped lever 34 rotates clockwise about the shaft 35, and the shaft 40 is moved downward by the rotation of the U-shaped lever 34. In conjunction with this, the float arm 51 rotates counterclockwise about the rocking shaft 37, and the first shaft 58, which is a connecting portion with the coil spring 54, moves to the right to move the rocking 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 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 deformation of the coil spring 54 is suddenly restored, the sub arm 52 rotates clockwise, and the second shaft 59 snaps to the left. As a result, the valve shaft operating rod 28 connected to the shaft 60 of the sub arm 52 moves upward, the lifting rod 22 and the lifting rod 31 move upward, and the air supply valve 18 in the switching valve 4 is a spherical air supply valve. The body 21 opens the air supply valve port 24, and the exhaust valve 19 closes the exhaust valve port 32 of the exhaust valve 19.

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 decreases due to the discharge of the condensate, the float 3 descends, and the U-shaped lever 34 rotates counterclockwise about the shaft 35, and the U-shaped lever 34 rotates. In conjunction with the upward movement of the shaft 40, the float arm 51 rotates in the clockwise direction around the swing shaft 37, and the first shaft 58, which is a connecting portion with the coil spring 54, moves to the left. The coil spring 54 is compressed and deformed when approaching the line connecting the swing shaft 37 and the second shaft 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 is moved leftward from the line connecting the two shafts 59, the deformation of the coil spring 54 is suddenly restored, the sub arm 52 rotates counterclockwise, and the second shaft 59 snaps to the right. As a result, the valve shaft operating rod 28 connected to the shaft 60 of the sub arm 52 moves downward, the lifting rod 22 and the lifting rod 31 move downward, and the air supply valve 18 in the switching valve 4 is spherically fed. The air valve body 21 closes the supply valve port 24, and the exhaust valve 19 opens the exhaust valve port 32 of the exhaust valve 19.

  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 6 Lever float 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 Valve case 21 Spherical air supply valve body 22 Lifting rod 24 Air supply valve port 28 Valve shaft operation rod 30 Exhaust valve body 32 Exhaust valve port 34 U-shaped lever 62 Inner mounting member 63 Mounting member 64 Bolt 66 Hanging shaft

Claims (1)

The sealed container is provided with a working fluid inlet, a working fluid outlet, a liquid inlet and a liquid outlet. A lever float and a switching valve are built in the sealed container, and the lever float is swingably mounted in the sealed container. A U-shaped lever and a connecting member fixed to the bridge portion of the U-shaped lever by welding and a connecting member and a connecting member that pass through the connecting member and are laid on opposite plates of the U-shaped lever. It consists of a float that rises and falls according to the liquid level in the sealed container, and the switching valve according to the height of the liquid level of the liquid accumulated in the sealed container is connected to the supply valve port of the working fluid inlet and the working fluid Switch the opening and closing of the exhaust valve opening, first open the exhaust valve opening and close the air supply valve opening to allow liquid to flow in from the liquid inflow port, then close the exhaust valve opening and open the air supply valve opening to close the container The liquid accumulated inside is pumped from the liquid outlet. Liquid pumping apparatus according to symptoms.

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