JP2023056299A - Liquid force-feeding device - Google Patents

Abstract

To provide a liquid force-feeding device capable of alleviating the collision with a valve seat of an exhaust valve.SOLUTION: A liquid force-feeding device 1 uses driving fluid F flowing into a container 2 for pressurizing liquid W stored in the container 2 to discharge it to the outside of the container 2. The liquid force-feeding device 1 includes a float 24 stored inside the container 2 for detecting a liquid level WL of the liquid W stored in the container 2, an exhaust valve 22 for opening/closing a driving fluid outflow port 18 on the basis of the liquid level WL detected by the float 24, an operation mechanism 26 connecting the exhaust valve 22 to the float 24, and a viscous damper 60 provided in the operation mechanism 26 for moderating the valve closing speed of the exhaust valve 22.SELECTED DRAWING: Figure 3

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid pumping device that pressurizes a liquid stored in a container with a driving fluid that has flowed into the container and discharges the liquid to the outside of the container.

2. Description of the Related Art There is a liquid pumping device that pressurizes a liquid stored in a container using steam or compressed air as a driving fluid and discharges the liquid out of the container (for example, Patent Document 1). A pumping device such as that disclosed in Patent Document 1 is called a pumping trap, and is a mechanical pump that does not require electricity. Pumping traps do not require electricity, so they have the advantage of being applicable, for example, to areas where power supply is difficult.

Japanese Patent No. 5897988

In a liquid pumping device such as that disclosed in Patent Document 1, when the liquid level rises and the drive fluid is introduced into the container, for example, the exhaust valve is pressed against the valve seat by a spring force to maintain airtightness. At this time, the valve seat may be damaged due to the strong collision of the exhaust valve with the valve seat. If the valve seat is damaged, the pressure inside the container will not increase, and normal pumping of liquid will not be possible.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid pumping device that can reduce the impact of an exhaust valve against a valve seat.

In order to achieve the above object, a liquid pumping device according to the present invention is a liquid pumping device for pressurizing a liquid stored in a container by a driving fluid flowed into the container and discharging the liquid outside the container, a float housed inside a container for detecting the liquid level of the liquid stored in the container; an exhaust valve for opening and closing a driving fluid outlet based on the liquid level detected by the float; and the exhaust valve. and the float, and a viscous damper provided in the operating mechanism to moderate the closing speed of the exhaust valve.

According to this configuration, the closing speed of the exhaust valve is slowed down by the viscous damper, so collision of the exhaust valve with the valve seat can be mitigated. As a result, the durability of the exhaust valve can be improved, and noise at the time of collision can be suppressed.

In the present invention, the viscous body of the viscous damper is, for example, liquid stored in the container. According to this configuration, the liquid in the container is used as the viscous body, so the structure is simplified.

In the present invention, the viscous damper has a case filled with a viscous material and a piston movably inserted into the case, and the case is rotatably supported by the container by a pivot member. may be Since the lever of the float is generally formed in the shape of a straight rod, the movement of the lever follows an arc-shaped trajectory. Therefore, the movement of the piston of the viscous damper is not a complete vertical stroke. According to this configuration, since the case of the viscous damper is rotatably supported by the container, the vertical deviation of the movement (trajectory) of the lever of the float is absorbed, and the piston can smoothly reciprocate in the case. .

In the present invention, the operating mechanism has a link body and a spring member interposed between the link body and the lever of the float, and the shaft connected to the piston of the viscous damper is connected together with the spring member. , may be fastened together with the link body. According to this configuration, the shaft of the viscous damper is fastened to the link body together with the spring member, so that the structure is simple and can be easily applied to existing devices.

According to the liquid pressure-feeding device of the present invention, the viscous damper slows down the closing speed of the exhaust valve, so that collision of the exhaust valve with the valve seat can be mitigated.

It is a schematic block diagram which shows the basic structure of a liquid pumping apparatus. 1. It is a schematic block diagram which shows the state different from FIG. 1 of the same liquid pumping apparatus. FIG. 4 is a vertical cross-sectional view showing the state of the inflow process of the liquid pumping device according to the first embodiment of the present invention; FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3; 4 is a cross-sectional view showing an enlarged V portion of FIG. 3; FIG. It is a longitudinal cross-sectional view which shows the state of the pressure|voltage rise process of the same liquid pumping apparatus. FIG. 7 is a cross-sectional view along line VII-VII of FIG. 6;

Preferred embodiments of the present invention will be described below with reference to the drawings. First, the basic structure of the liquid pumping device will be described with reference to FIGS. 1 and 2. FIG. 1 and 2 are schematic configuration diagrams showing a liquid pumping device. The pumping device 1 pressurizes the liquid W stored in the container 2 with the driving fluid F introduced into the container 2 and discharges it to the outside of the container 2 . 1 shows the state in which the liquid W is flowing in, and FIG. 2 shows the state in which the liquid W is discharged. The liquid W is, for example, water, in particular condensate from steam pipes, steam equipment or the like. Also, the driving fluid F is, for example, steam.

The container 2 is provided with a liquid inlet 4 through which the liquid W flows and a liquid outlet 6 through which the liquid W flows out. A liquid inflow passage 8 is connected to the liquid inflow port 4 , and a liquid outflow passage 10 is connected to the liquid outflow port 6 . An inflow side check valve 12 is connected between the liquid inflow port 4 and the liquid inflow passage 8 , and an outflow side check valve 14 is connected between the liquid outflow port 6 and the liquid outflow passage 10 .

At the top of the container 2, a driving fluid inlet 16 for allowing the driving fluid F to flow into the container 2 and a driving fluid outlet 18 for discharging the driving fluid F from the container 2 to the outside of the container 2 are provided. A driving fluid inflow passage 17 is connected to the driving fluid inflow port 16 , and a driving fluid outflow passage 19 is connected to the driving fluid outflow port 18 . The pumping device 1 has a drive valve (suction valve) 20 that opens and closes the drive fluid inlet 16 and an exhaust valve 22 that opens and closes the drive fluid outlet 18 .

A float 24 for detecting the liquid level WL of the liquid W stored in the container 2 is accommodated inside the container 2 . Drive valve 20 and exhaust valve 22 are connected to lever 24 a of float 24 via actuation mechanism 26 . The actuation mechanism 26 has a plurality of link members 28 and a single spring member 30 pivotally connected to each other. A plurality of link members 28 constitute a link body. The operating mechanism 26 operates the drive valve 20 and the exhaust valve 22 based on the liquid level WL detected at the float 24 .

When the liquid level WL shown in FIG. 1 is low, the float 24 floating on the liquid W is also at a low position. At this time, the drive valve 20 is closed and the exhaust valve 22 is opened by the operation of the operating mechanism 26 . That is, the inflow of the driving fluid F into the container 2 is blocked, and the internal space of the container 2 is open to the atmosphere. When the liquid level WL is low, the internal pressure of the container 2 is low, so the liquid W in the liquid inflow passage 8 opens the inflow side check valve 12 and flows into the container 2 from the liquid inflow port 4 (inflow process ). On the other hand, since the pressure inside the container 2 is low, the outflow side check valve 14 is closed.

When the liquid W flows into the container 2, the liquid level WL rises, and the float 24 also rises accordingly. When the liquid level WL exceeds a specified value, the drive valve 20 is opened and the exhaust valve 22 is closed by the operation of the operating mechanism 26, as shown in FIG. That is, the driving fluid F flows into the container 2, and the discharge of the driving fluid F from the container 2 to the outside is prevented (pressurization step). At this time, the spring force of the spring member 30 presses against the exhaust valve 22 to maintain airtightness. As a result, the pressure inside the container 2 increases, so that the liquid W in the container 2 opens the outflow side check valve 14 and is discharged from the liquid outflow port 6 through the liquid outflow passage 10 to the outside of the container 2. (Ejection process). On the other hand, since the pressure inside the container 2 is high, the inflow side check valve 12 is closed.

When the liquid W is discharged out of the container 2, the liquid level WL drops (pressure equalization step). Along with this, the float 24 also descends and returns to the state shown in FIG. Thereafter, the state of FIG. 1 and the state of FIG. 2 are repeated, and the liquid W is pressure-fed.

Next, the liquid pumping device 1 according to the first embodiment of the present invention will be described with reference to FIGS. 3 to 7. FIG. 3 and 5 show the state of the liquid pressure-feeding device 1 in the inflow process, and FIGS.

As shown in FIG. 3, a frame FR is detachably attached to the container 2 with bolts B, and an operating mechanism 26 is attached to the frame FR. In this embodiment, the frame FR is made of a metal plate. However, the material of the frame FR is not limited to this.

The actuating mechanism 26 is arranged inside the container 2 and has the float 24 attached to one end and the drive valve 20 and the exhaust valve 22 shown in FIG. 4 attached to the other end. That is, the float 24 , the drive valve 20 and the exhaust valve 22 are supported by the container 2 via the actuation mechanism 26 .

The actuation mechanism 26 has a plurality of link members 28 . Specifically, the operating mechanism 26 includes a first link member 31 rotatably connected to the float 24 of FIG. 3 and a second link member 32 rotatably connected to the first link member 31. and The plurality of link members 28, that is, the first and second link members 31 and 32 constitute a link body. The first link member 31 is made of an elongated plate, and the second link member 32 is made of an elongated bar. The second link member 32 extends vertically.

As shown in FIG. 5, one end 31a of the first link member 31 is rotatably connected to the tip of the lever 24a of the float 24. As shown in FIG. Specifically, the first link member 31 and the lever 24 a of the float 24 are connected by a first connecting pin 34 so as to be rotatable around the first connecting pin 34 .

Furthermore, a spring member 30 is stretched between the first link member 31 and the lever 24 a of the float 24 . Specifically, both ends 30a and 30b of the spring member 30 are connected to the longitudinal intermediate portion of the lever 24a and the other end 31b of the first link member 31, respectively. One end 30a of the spring member 30 is connected by a second connecting pin 36 to the longitudinal intermediate portion of the lever 24a. On the other hand, the other end 30b of the spring member 30 is connected to the other end 31b of the first link member 31 by a third connecting pin 38. As shown in FIG.

One end portion (lower end portion) 32 a of the second link member 32 is connected to the longitudinal intermediate portion of the first link member 31 . Specifically, the first link member 31 and the second link member 32 are connected by a fourth connecting pin 40 so as to be rotatable around the fourth connecting pin 40 .

As shown in FIG. 3, a pin 42 is fixed to the other end (upper end) 32b of the second link member 32. As shown in FIG. The pin 42 extends in a direction perpendicular to the second link member 32, that is, in the horizontal direction.

As shown in FIG. 4, the drive valve 20 is fixed to one end 42a of the pin 42, and the exhaust valve 22 is fixed to the other end 42b. The drive valve 20 is closed when a spherical valve element 45 is seated from above on a valve seat 44 provided in the drive fluid inlet 16 . Further, the driven valve 20 opens when the valve body 45 is lifted by the driving pin 46 from below and separated from the valve seat 44 .

The exhaust valve 22 closes when a cylindrical valve body 50 is seated from below on a valve seat 48 provided in the drive fluid outlet 18 . Furthermore, the exhaust valve 22 opens when the valve element 50 moves downward and leaves the valve seat 48 . A drive pin 46 of the drive valve 20 and a valve body 50 of the exhaust valve 22 are fixed to the pin 42 .

4, the link member 28 and pin 42 are at a low position because the liquid level WL (FIG. 3) is low. That is, the drive pin 46 of the drive valve 20 fixed to the pin 42 and the valve body 50 of the exhaust valve 22 are also positioned downward. Therefore, the valve body 45 of the drive valve 20 is seated on the valve seat 44 to close the valve, and the valve body 50 of the exhaust valve 22 is separated from the valve seat 48 to open the valve.

On the other hand, in the pressurization step of FIG. 7, the liquid level WL (FIG. 6) is high, so the link member 28 and the pin 42 are at high positions. That is, the drive pin 46 of the drive valve 20 fixed to the pin 42 and the valve body 50 of the exhaust valve 22 are also positioned upward. Therefore, the valve body 45 of the drive valve 20 is lifted by the drive pin 46 and separated from the valve seat 44 to open the valve. The exhaust valve 22 is closed with the valve body 50 seated on the valve seat 48 .

As shown in FIG. 3 , the liquid pumping device 1 further has a viscous damper 60 . A viscous damper 60 is provided in the actuation mechanism 26 to moderate the closing speed of the exhaust valve 22 . As shown in FIG. 5, the viscous damper 60 has a case 62 filled with a viscous material and a piston 64 movably inserted into the case 62 . That is, the viscous damper 60 has the piston 64 inserted into the case 62 filled with the viscous material, and exerts a damping force proportional to the shear rate of the gap between the piston 64 and the case 62 . In this embodiment, the liquid W stored in the container 2 is used as the viscous body.

The case 62 has a cylindrical shape with an open top and a closed bottom. A viscous material inlet/outlet 62 a is formed in the peripheral wall of the lower end portion of the case 62 . The viscous material inlet/outlet 62a penetrates the peripheral wall of the case 62 in the radial direction. The viscous material (liquid W) in the container 2 flows into or out of the case 62 through the viscous material inlet/outlet 62a. The viscous material inlet/outlet 62a is located below the lower limit (LL) of the liquid level WL (FIG. 3) of the liquid W. That is, the viscous material inlet/outlet port 62a is submerged in the liquid W when shifting from the inflow process to the pressurizing process.

The case 62 is rotatably supported on the container 2 by a shaft support member 65 . The shaft support member 65 is a shaft body extending in the horizontal direction (the direction perpendicular to the paper surface of FIG. 5). A shaft support member 65 is inserted through a shaft insertion hole 62b formed in the lower end of the case 62 and is screwed to the frame FR. As a result, the case 62 is supported by the frame FR (container 2) so as to be rotatable about the axis of the pivot member 65 (in the direction of arrow A in FIG. 5).

An upper opening of the case 62 is closed by a lid 66 . The lid 66 is detachably attached to the upper end of the case 62 with fastening members (not shown) such as bolts. The lid 66 is formed with a fluid port 66a. The fluid inlet/outlet 66a passes through the lid 66 in the axial direction (vertical direction). In this embodiment, a plurality of fluid inlets/outlets 66a are provided side by side in the circumferential direction. The fluid (liquid W, driving fluid F, air) in the case 62 flows into the case 62 or out of the case 2 through the fluid inlet/outlet 66a. A vertically extending shaft insertion hole 66 b is formed in the central portion of the lid 66 .

The piston 64 moves axially (vertically) along the inner peripheral surface of the case 62 . Piston 64 is driven by a shaft 68 connected to actuation mechanism 26 . The shaft 68 extends vertically through a shaft insertion hole 66 b of the lid 66 , and has an upper end 68 a connected to the operating mechanism 26 and a lower end 68 b connected to the piston 64 .

Specifically, the upper end 68a of the shaft 68 is fastened together with the spring member 30 to the other end 31b of the first link member 31 by the third connecting pin 38 . A male thread is formed on the lower end 68b of the shaft 68, and a female thread 64a is formed on the upper surface of the piston 64. As shown in FIG. The lower end 68b of the shaft 68 is connected to the piston 64 by screwing the male thread 68b at the lower end of the shaft 68 into the female thread 64a of the piston 64 .

Next, the operation of the viscous damper 60 of the liquid pumping device 1 of this embodiment will be described. In the inflow process shown in FIG. 3, the liquid level WL is low and the float 24 is also at a low position. The piston 64 of the viscous damper 60 interlocking with the float 24 is also at a low position inside the case 62 . At this time, as shown in FIG. 4, the drive valve 20 is closed and the exhaust valve 22 is open.

When the liquid W shown in FIG. 3 flows into the container 2, the liquid level WL rises, and the float 24 also rises accordingly. When the liquid level WL exceeds a specified value, as shown in FIG. 7, the drive valve 20 is opened and the exhaust valve 22 is closed by the operation of the operating mechanism 26 (pressurization step). At this time, the piston 64 of the viscous damper 60 shown in FIG. 6 also moves upward inside the case 62 . At this time, the liquid W (viscous body) flows into the case 62 from the viscous body inlet/outlet 62a, and the fluids W and F in the case 62 flow out from the fluid inlet/outlet 66a (FIG. 5). Due to the viscosity (frictional force) of this viscous body, the moving speed of the operating mechanism 26 slows down. As a result, when the exhaust valve 22 shown in FIG. 7 is closed, the force with which the valve element 50 collides with the valve seat 48 is reduced.

As indicated by a two-dot chain line in FIG. 6, when the liquid W is discharged out of the container 2, the liquid level WL is lowered (discharging step) and the float 24 is also lowered. When the liquid level WL exceeds a specified value, the drive valve 20 is closed and the exhaust valve 22 is opened by the operation of the operating mechanism 26, as shown in FIG. 4 (pressure equalization step). At this time, the piston 64 of the viscous damper 60 shown in FIG. 3 also moves downward inside the case 62 . At this time, the liquid W (viscous body) in the case 62 flows out from the viscous body inlet/outlet 62a, and the fluids W and F flow into the case 62 from the fluid inlet/outlet 66a. Due to the viscosity (frictional force) of this viscous body, the moving speed of the operating mechanism 26 slows down. Thereafter, the states of FIGS. 3 and 4 and the states of FIGS. 6 and 7 are repeated, and the liquid W is pumped.

According to the above configuration, the closing speed of the exhaust valve 22 is slowed down by the viscous damper 60, so collision of the valve body 50 of the exhaust valve 22 against the valve seat 48 can be alleviated. As a result, the durability of the exhaust valve 22 can be improved, and the noise at the time of collision can be suppressed. Moreover, since the liquid W stored in the container 2 is used as the viscous body, the structure is simplified.

As shown in FIG. 5, the movement of the third connecting pin 38 inserted through the insertion hole of the first link member 31 draws an arcuate trajectory K. As shown in FIG. Therefore, the movement of the piston 64 of the viscous damper 60 is not a complete vertical stroke. In the above configuration, the case 62 of the viscous damper 60 is supported by the container 2 so as to be rotatable about the shaft support member 65, so that the vertical deviation of the movement (trajectory) of the lever 24a of the float 24 is absorbed, and the piston 64 can reciprocate within the case 62 .

A shaft 68 of the viscous damper 60 is fastened together with the spring member 30 to the link member 28 . This simplifies the structure and makes it easy to apply the viscous damper 60 of the present embodiment to existing devices.

The present invention is not limited to the above embodiments, and various additions, changes, or deletions are possible without departing from the scope of the present invention. Accordingly, such are also included within the scope of this invention.

1 Liquid pumping device 2 Container 18 Driving fluid outlet 22 Exhaust valve 24 Float 24a Float lever 26 Actuating mechanism 28 Link body 30 Spring member 60 Viscous damper 62 Case 64 Piston 65 Axial member 68 Shaft F Driving fluid W Liquid (viscous body )
WL Liquid level

Claims (4)

A liquid pumping device for pressurizing a liquid stored in a container with a driving fluid that has flowed into the container and discharging the liquid to the outside of the container,
a float that is housed inside the container and detects the liquid level of the liquid stored in the container;
an exhaust valve that opens and closes a driving fluid outlet based on the liquid level detected by the float;
an actuation mechanism connecting the exhaust valve and the float;
and a viscous damper that is provided in the operating mechanism and reduces the closing speed of the exhaust valve. 2. The liquid pumping device according to claim 1, wherein the viscous body of said viscous damper is a liquid stored in said container. 3. The liquid pumping device according to claim 1, wherein the viscous damper has a case filled with a viscous body and a piston movably inserted into the case,
A liquid pumping device, wherein the case is rotatably supported on the container by a pivot member. 4. The liquid pumping device according to any one of claims 1 to 3, wherein the actuation mechanism has a link body and a spring member interposed between the link body and a lever of the float,
A liquid pumping device, wherein a shaft connected to a piston of the viscous damper is fastened together with the spring member to the link body.

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