JP7449593B2 - Liquid pumping device - Google Patents

Description

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

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 outside the container (for example, Patent Document 1). The pressure feeding device as 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.

Patent No. 5897988

In the conventional liquid pumping device, as shown in FIG. 5, the power of the actuating mechanism 103 that operates the valve 102 based on the liquid level detected by the float 101 was dependent on the spring force of a single spring member 104. . Although the plurality of link members 105 constituting the actuation mechanism 103 are rotatably connected, the rotation of the link members 105 may be hindered due to deterioration of the sliding portion 106 or the like. As a result, the spring force F would not act sufficiently in the vertical direction of the liquid level (upward in FIG. 5), and there was a possibility that the valve 102 would malfunction.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid pumping device in which a valve can be operated satisfactorily by an operating mechanism.

In order to achieve the above object, a liquid pumping device of the present invention is a liquid pumping device that pressurizes a liquid stored in a container using a driving fluid that has flowed into the container and discharges the liquid to the outside of the container. a float that is housed inside and detects the liquid level of the liquid stored in the container; an on-off valve that opens and closes based on the liquid level detected by the float; and a connection between the on-off valve and the float. It is equipped with an operating mechanism. The operation mechanism includes an upstream link member connected to the float, a downstream link member connected to the on-off valve, one or more intermediate link members, and an operation of the on-off valve by vertical movement of the float. These members are rotatably connected. The downstream link member has a contact portion that contacts the upstream link member when the float is raised. By the downstream link member and the upstream link member coming into contact with each other at the contact portion, the buoyant force of the float acts on the downstream link member.

According to this configuration, the downstream link member connected to the on-off valve and the upstream link member connected to the float come into contact at the contact portion when the float rises. As a result, the end of the downstream link member is pushed up by the upstream link member, and the operation of the on-off valve is assisted. In other words, not only the spring force of the spring member but also the buoyant force of the float can be used as motive power for the actuation mechanism. As a result, the operation of the valve by the actuation mechanism is improved.

In the present invention, the downstream link member may extend in the vertical direction, and the contact portion may be a lower end portion of the downstream link member. According to this configuration, the abutting portion can be configured simply by extending the end of the downstream link member downward, so the configuration is simple.

In the present invention, the contact portion may include a damper made of an elastic body. According to this configuration, the contact portion is protected by the damper.

According to the liquid pumping device of the present invention, not only the spring force of the spring member but also the buoyant force of the float can be used as motive power for the operating mechanism, so that the valve can be operated satisfactorily by the operating mechanism.

FIG. 1 is a schematic configuration diagram showing the basic structure of a liquid pumping device. FIG. 2 is a schematic configuration diagram showing a state of the liquid pumping device different from that shown in FIG. 1; 1 is a longitudinal cross-sectional view showing a liquid pumping device according to a first embodiment of the present invention. It is a sectional view showing a valve mechanism of the liquid pressure feeding device. FIG. 2 is a cross-sectional view showing a valve mechanism of a conventional liquid pumping device.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, the basic structure of the liquid pumping device will be explained using FIGS. 1 and 2. 1 and 2 are schematic configuration diagrams showing a liquid pumping device. The pressure feeding device 1 pressurizes a liquid W stored in a container 2 with a driving fluid F introduced into the container 2, and discharges the liquid W to the outside of the container 2. FIG. 1 shows a state in which liquid W is flowing in, and FIG. 2 shows a state in which liquid W is being discharged. The liquid W is, for example, water, specifically, condensate from steam piping, steam equipment, etc. Further, 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 inlet passage 8 is connected to the liquid inlet 4, and a liquid outlet passage 10 is connected to the liquid outlet 6. An inlet check valve 12 is connected between the liquid inlet 4 and the liquid inlet passage 8, and an outlet check valve 14 is connected between the liquid outlet 6 and the liquid outlet passage 10.

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 in the container 2 to the outside of the container 2 are provided at the top of the container 2 . A driving fluid inlet passage 17 is connected to the driving fluid inlet 16 , and a driving fluid outlet passage 19 is connected to the driving fluid outlet 18 . The pressure feeding device 1 includes 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 that detects the liquid level WL of the liquid W stored in the container 2 is housed inside the container 2 . The drive valve 20 and the exhaust valve 22 are connected to a lever 24a of the float 24 via an actuation mechanism 26. The actuation mechanism 26 includes a plurality of link members 28 and a single spring member 30 that are rotatably connected to each other. The operating mechanism 26 operates the drive valve 20 and the exhaust valve 22 based on the liquid level WL detected by the float 24. That is, the drive valve 20 and the exhaust valve 22 constitute an on-off valve that opens and closes based on the liquid level WL detected by 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, due to the operation of the actuation mechanism 26, the drive valve 20 is brought into a closed state, and the exhaust valve 22 is brought into an open state. That is, the driving fluid F is prevented from flowing into the container 2, and the internal space of the container 2 is opened to the atmosphere. When the liquid level WL is low, the pressure inside 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 inlet 4 (inflow step). ). On the other hand, since the pressure inside the container 2 is low, the outflow side check valve 14 is in a closed state.

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 the specified value, as shown in FIG. 2, the actuating mechanism 26 operates to open the drive valve 20 and close the exhaust valve 22. In other words, the driving fluid F flows into the container 2, and the driving fluid F in the container 2 is prevented from being discharged to the outside (pressurization step). At this time, the exhaust valve 22 is pressed by the spring force of the spring member 30, thereby maintaining airtightness. As a result, the pressure inside the container 2 increases, so 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. (discharge process). On the other hand, since the pressure inside the container 2 is high, the inflow side check valve 12 is in a closed state.

When the liquid W is discharged outside the container 2, the liquid level WL decreases (pressure equalization step). Along with this, the float 24 also descends, returning to the state shown in FIG. Thereafter, the state shown in FIG. 1 and the state shown in FIG. 2 are repeated, and the liquid W is pumped.

Next, the liquid pumping device 1 according to the first embodiment of the present invention will be described using FIGS. 3 and 4. As shown in FIG. 3, a frame FR is detachably attached to the container 2 with bolts B, and an actuation 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 actuation mechanism 26 is arranged inside the container 2, and has a float 24 attached to one end thereof, and a drive valve 20 and an exhaust valve 22 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 includes a plurality of link members 28 and a spring member 30. In detail, the actuation mechanism 26 includes an upstream link member 32, intermediate link members 34, 36, a spring member 30, and a downstream link member 38, each of which includes a link member 30, 32, 34, 36, 38 are rotatably connected. These plurality of link members 32, 34, 36, and 38 are made of long plate materials. In this embodiment, there are two intermediate link members 34 and 36, but there may be one or three or more.

As shown in FIG. 4(A), the upstream link member 32 is connected to the float 24. The first intermediate link member 34 has one end 34a rotatably connected to the upstream link member 32, and the other end 34b rotatably connected to the spring member 30. The second intermediate link member 36 has one end 36a rotatably connected to the spring member 30, and the other end 36b rotatably connected to the frame FR via the second rotation shaft 42. The downstream link member 38 extends in the vertical direction, is connected to the on-off valves 20 and 22 at its upper end 38a, and is rotatably connected to the second intermediate link member 36 at its vertical intermediate portion 38b.

One end 32a of the upstream link member 32 is connected to the float 24. The upstream link member 32 is rotatably connected to the frame FR via a first rotation shaft 40 at a longitudinally intermediate portion thereof. In other words, the upstream link member 32 constitutes a lever for the float 24.

One end 34a of the first intermediate link member 34 is rotatably connected to the other end 32b of the upstream link member 32. Specifically, the upstream link member 32 and the intermediate link member 34 are connected by a first connecting pin 44 so as to be rotatable around the first connecting pin 44 . The other end 34b of the first intermediate link member 34 is rotatably connected to one end 30a of the spring member 30. Specifically, the first intermediate link member 34 and the spring member 30 are connected by a second connection pin 46 so as to be rotatable around the second connection pin 46 .

One end 36a of the second intermediate link member 36 is rotatably connected to the other end 30b of the spring member 30. Specifically, the second intermediate link member 36 and the spring member 30 are connected by a third connecting pin 48 so as to be rotatable around the third connecting pin 48 . The second intermediate link member 36 is rotatably connected to the frame FR via the second rotation shaft 42 at the other end 36b.

One end (upper end) 38a of the downstream link member 38 is rotatably connected to the on-off valves 20, 22. The on-off valves 20 and 22 are connected to the downstream link member 38 via a pin 45 (FIG. 1). A vertically intermediate portion 38b of the downstream link member 38 is rotatably connected to a longitudinally intermediate portion 36c of the second intermediate link member 36. Specifically, the downstream link member 38 and the second intermediate link member 36 are connected by a fourth connecting pin 50 so as to be rotatable around the fourth connecting pin 50.

As shown in FIG. 4(B), the downstream link member 38 has a contact portion 52 at its lower end (other end) 38c. The contact portion 52 contacts the upstream link member 32 when the float 24 rises. In this embodiment, the contact portion 52 is configured by extending the lower end portion 38c of the downstream link member 38 downward. Specifically, the downstream link member 38 of this embodiment has an extension portion 55 extending downward from the fourth connection pin 50. The lower end portion 38c of this extension portion 55 constitutes the contact portion 52. As shown in FIG. 4A, the upstream link member 32 and the downstream link member 38 come into contact with each other at the contact portion 52, so that the buoyancy of the float 24 acts on the downstream link member 38.

As shown in FIG. 4(B), the contact portion 52 may include a damper 54 made of an elastic body such as rubber. In the example of FIG. 4(B), the damper 54 is attached to the lower end portion 38c of the downstream link member 38. The damper 54 is made of heat-resistant rubber such as silicone rubber, for example. However, the damper 54 may be omitted.

Next, the operation of the operating mechanism 26 of the liquid pumping device 1 of this embodiment will be explained. As shown in FIG. 4(A), the upstream link rotates around the first rotating shaft 40 (around arrow R1 in FIG. 4(A)) when the liquid level rises, that is, when the float 24 rises. The upper surface of the member 32 abuts the abutting portion 52 at the lower end of the downstream link member 38 . Thereby, in addition to the spring force F1 of the spring member 30, the buoyant force F2 of the float 24 is transmitted to the downstream link member 38 via the upstream link member 32.

As a result, as shown in FIG. 4(B), the downstream link member 38 easily rotates around the second rotation shaft 42 (around the arrow R2 in FIG. 4(B)), and The member 38 moves upward (in the direction of arrow A1).

According to the above configuration, the downstream link member 38 and the upstream link member 32 come into contact at the contact portion 52 when the float 24 is raised as shown in FIG. 4(A). As a result, the lower end portion 38c of the downstream link member 38 is pushed up by the upstream link member 32, and the operation of the drive valve 20 and the exhaust valve 22 is assisted. In other words, not only the spring force F1 of the spring member 30 but also the buoyant force F2 of the float 24 can be used as motive power for the actuation mechanism 26. As a result, the valves 20, 22 can be operated better by the actuating mechanism 26.

The lower end portion 38c of the downstream link member 38 extending in the vertical direction constitutes the contact portion 52. According to this configuration, the abutment portion 52 can be configured by simply extending the downstream link member 38 downward, so the configuration is simple.

As shown in FIG. 4(B), the contact portion 52 has a damper 54 made of an elastic body. This damper 54 absorbs the impact when colliding with the upstream link member 32 and protects the contact portion 52.

The present invention is not limited to the above-described embodiments, and various additions, changes, or deletions can be made without departing from the gist of the present invention. For example, in the above embodiment, the contact portion 52 is the lower end portion 38c of the downstream link member 38, but the contact portion 52 is such that the buoyancy of the float 24 acts on the downstream link member 38 when the float 24 rises. It may be any configuration and is not limited to the embodiment. Therefore, such materials are also included within the scope of the present invention.

1 Liquid pressure feeding device 2 Container 18 Driving fluid outlet 20 Driving valve (on-off valve)
22 Exhaust valve (open/close valve)
24 Float 26 Actuation mechanism 30 Spring member 32 Upstream link members 34, 36 Intermediate link member 38 Downstream link member 52 Contact portion 54 Damper F Driving fluid W Liquid (viscous body)
WL liquid level

Claims (3)

A liquid pumping device that pressurizes a liquid stored in a container with a driving fluid that has flowed into the container and discharges it out of the container,
a float that is housed inside the container and detects the level of the liquid stored in the container;
an on-off valve that opens and closes based on the liquid level detected by the float;
an actuation mechanism that connects the on-off valve and the float,
The operation mechanism includes an upstream link member connected to the float, a downstream link member connected to the on-off valve, one or more intermediate link members, and an operation of the on-off valve by vertical movement of the float. and a spring member that assists, and each of these members is rotatably connected,
The downstream link member has a contact portion that contacts the upstream link member when the float rises,
A liquid pumping device in which the buoyancy of the float acts on the downstream link member by abutting the downstream link member and the upstream link member at the contact portion. The liquid pumping device according to claim 1, wherein the downstream link member extends in a vertical direction,
A liquid pumping device, wherein the contact portion is a lower end portion of the downstream link member. 3. The liquid pumping device according to claim 1, wherein the contact portion includes a damper made of an elastic body.

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