JPH11304092A - Liquid recovery device using pressure driving pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid recovery device using a small and inexpensive pressure driving pump. SOLUTION: A branching passage 22 is connected to a liquid discharge port 9. The branching passage 22 is connected to a liquid supply port 31 by making an ejector 21 communicate with it. A suction chamber 25 of the ejector 21 is connected to an outlet of a steam trap 28. A liquid reservoir part 2 is integrally set on an upper part of a closed type container 1. A siphon pipe 4 is set on the liquid reservoir part 2. When a part of liquid discharged from the liquid discharge port 9 flows down in the ejector 21, condensate is sucked from the steam trap 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid recovery apparatus suitable for recovering condensed water generated as condensed water in various steam-using equipment such as a heat exchanger in a boiler, a waste heat utilization apparatus or the like. In particular, the present invention relates to a liquid recovery apparatus using a pressure driven pump that pumps condensed water as a liquid with a fluid such as high-pressure steam or compressed air without using electricity as a power source.

[0002]

2. Description of the Related Art As a conventional liquid recovery apparatus, for example, a liquid recovery apparatus disclosed in JP-A-6-167296 has been used. In this method, a plurality of receiver tanks and a pump body as a pumping device are arranged at a predetermined head height apart, and liquid is circulated between the pump body and the receiver tank, thereby collecting condensate from the steam-using equipment. At the same time, the recovered condensate can be pumped to a predetermined location.

[0003]

In the above-mentioned conventional liquid recovery apparatus, a plurality of receiver tanks and a pump body which is arranged at a predetermined head height apart from the receiver tank are required. There is a problem that the connection becomes complicated and the device becomes expensive.

Accordingly, an object of the present invention is to provide a liquid recovery apparatus using a small and inexpensive pressure driven pump without using a plurality of receiver tanks and a predetermined head height.

[0005]

Means taken to solve the above problem are as follows. A closed container is provided with a high-pressure working fluid inlet and a working fluid outlet, a liquid inlet and a liquid outlet to be fed under pressure. The working fluid inlet is opened and the working fluid outlet is closed according to the liquid level of the liquid stored in the sealed container, and the liquid stored in the sealed container is discharged from the liquid outlet through the liquid outlet. A liquid source for pressure feeding to the outside, in which a branch passage is connected to a liquid discharge port, an ejector is connected to the branch passage, an outlet side of the ejector is connected to a liquid inlet, and a suction chamber of the ejector is collected. Is connected.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An ejector is connected to a branch passage branched from a liquid discharge port to connect a suction chamber of the ejector to a liquid source and connect an outlet side of the ejector to a liquid inlet to thereby discharge the liquid. While the liquid discharged from the outlet passes through the ejector from the branch passage, the liquid is sucked from the liquid source and reaches the liquid inlet from the outlet side of the ejector. Therefore,
The liquid branched from the branch passage and the liquid from the liquid source are mixed and flow down to the liquid inlet.

[0007] The mixed fluid flowing down from the liquid inlet reaches the closed container, and when the liquid level in the closed container reaches a predetermined height, the working fluid outlet is closed and at the same time, the high-pressure working fluid source is closed. The connected working fluid inlet is opened and high-pressure working fluid is supplied into the sealed container, and the liquid in the container is partially reached from the liquid outlet by the high-pressure working fluid to the branch passage and partially to a predetermined location. Pumped. The liquid that has reached the branch passage sucks the liquid from the liquid source in the suction chamber of the ejector and reaches the liquid inlet as described above.

By connecting an ejector to the liquid discharge port and sucking the liquid from the liquid source, there is no need to install a plurality of receiver tanks or a pump at a predetermined head height from the receiver tank. Can be made small and inexpensive.

[0009]

EXAMPLES Specific examples of the present invention will be described below. In this embodiment, an example is shown in which high-pressure steam is used as a working fluid, and condensate is used as a liquid to be pumped and collected. As shown in FIG. 1, a liquid recovery device using a pressure-driven pump includes a hermetically sealed container 1 as a pressure-driven pump,
It comprises a liquid outlet 9 provided at the lower part of the closed container 1 and an ejector 21 connected to the liquid outlet 9.

A float 3 and a snap mechanism 5 are arranged inside the sealed container 1 and a working fluid inlet 6 connected to a high-pressure steam source and a working fluid outlet 7 on the side of the sealed container 1. Is provided. A check valve 18 and a discharge pipe 20 are connected to the liquid discharge port 9 to connect the discharge pipe 20 to a liquid pressure destination (not shown), and a branch passage 22 is connected to the liquid discharge port 9 via a check valve 23 and a valve 24. It communicates with the ejector 21.

The ejector 21 has a steam trap 28.
A pipe 29 connected to a liquid source for recovery through the suction port 25 communicates with the suction chamber 25, and an outlet 30 of the ejector 21 is connected to a liquid supply port 31. In addition, steam trap 28
Pipe 37 which communicates the outlet side of the liquid and the liquid supply port 31
Is provided. An automatic on-off valve 38 is attached to the bypass line 37.

Above the hermetically sealed container 1, a liquid reservoir 2 which has substantially the same volume as that of the hermetically sealed container 1 and is also sealed is integrally provided. A liquid supply port 31 is provided in the liquid reservoir 2 and a siphon tube 4 is attached inside. One end opening 26 of the inverted U-shaped siphon tube 4 is opened at the lower part of the liquid reservoir 2, and the other end opening 8 is opened at the upper part of the sealed container 1 via a check valve 27. The liquid supply port 31, the liquid reservoir 2, the siphon tube 4, and the other end opening 8 form a liquid inlet into the closed container 1.

A pipe 32 and a valve 3 are provided above the liquid reservoir 2.
3 and adjust the opening of the valve 33 to adjust the liquid reservoir 2
The inside can be set to a pressure substantially equal to the atmospheric pressure or a pressure state slightly higher than the atmospheric pressure. Also,
A cooling fluid supply pipe 40 is connected to the upper part of the liquid reservoir 2 via a valve 39. A liquid reservoir 2 is provided on the side of the liquid reservoir 2.
A communication pipe is provided for communicating the inside with the inside of the closed container.
A valve 35 and a check valve 36 are attached to the communication pipe 34.
By opening the valve 35, the liquid accumulated in the liquid reservoir 2 can flow down into the closed container 1.

The float 3 in the closed container 1 is provided with a fulcrum 10
And the first lever 11 is displaced up and down about the fulcrum 12. Similarly, a second lever 13 is arranged rotatably about the fulcrum 12, and a compressed coil spring 14 is mounted between the end of the second lever 13 and the end of the first lever 11. Second
The operation rod 15 is connected to the upper part of the lever 13.

An operating fluid outlet 7 is provided above the operating rod 15.
And a control lever 17 is fixed to the middle part of the control rod 15. A spherical working fluid introduction valve body 19 is disposed above the operation lever 17 so as to be vertically movable.

FIG. 1 shows a state in which the amount of liquid in the closed container 1 is small and the float 3 is located below. Tube 2
The condensate flowing down from the steam trap 9 and the steam trap 28 flows down from the ejector 21 or the bypass pipe 37 into the liquid reservoir 2 via the liquid supply port 31 and accumulates. The liquid flows down through the check valve 27 from the opening 8 serving as a liquid inlet into the closed container 1. In this case, the condensate flows down into the closed container 1 until the liquid surface reaches the position of the one end opening 26 of the siphon tube 4 of the liquid reservoir 2.

When the liquid level in the sealed container 1 rises, the flow starts.
When the float 3 also reaches the predetermined height, the snap mechanism 5 snaps and the operating rod 15 is instantaneously displaced upward. Due to the upward displacement of the operating rod 15, the working fluid discharge valve body 16 closes the working fluid discharge port 7, and the working fluid introduction valve body 19 opens the working fluid introduction port 6, so that a high pressure from a steam source (not shown) is applied. Is supplied into the closed container 1 and the collected condensate is pumped out from the liquid discharge port 9 to the outside. In this case, a part of the condensate is pumped from the branch passage 22 to the ejector 21, and a part of the condensate is collected from the discharge pipe 20 to a predetermined location through the check valve 18.

When the liquid passes through the ejector 21, the condensate is sucked from the pipe 29 and the steam trap 28 by the suction action in the suction chamber 25. Since the suction force of the ejector 21 becomes substantially equal to the saturation pressure at the temperature of the fluid flowing down in the ejector 21, it can be adjusted by appropriately adjusting the temperature of the fluid by, for example, supplying a cooling fluid. Therefore, by increasing the suction force, the condensate can be reliably sucked even when the pressure of the condensate in the pipe 29 is low.

When a predetermined amount of the condensed water sucked by the ejector 21 accumulates in the liquid reservoir 2, the liquid flows from the siphon pipe 4 into the closed container 1, and the float 3 rises as described above and is again pumped or collected. You. When the liquid is pressure-fed and the liquid level in the sealed container 1 falls, the float 3 also descends. Closed,
The working fluid outlet 7 is opened to stop the liquid feeding or recovery. When the condensed water accumulates in the liquid reservoir 2 and reaches the upper end of the siphon pipe 4, the condensed water flows down again from the liquid inlet 8 into the closed container 1, and the above cycle is repeated.

[0020]

According to the liquid recovery apparatus using the pressure driven pump of the present invention, a plurality of receiver tanks and a predetermined head height are provided by connecting an ejector to the liquid discharge port and sucking the liquid from the liquid source. There is no need, and the device itself can be small and inexpensive.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional configuration diagram showing an embodiment of a liquid recovery device using a pressure driven pump of the present invention. DESCRIPTION OF SYMBOLS 1 Sealed container 2 Liquid reservoir 3 Float 4 Siphon pipe 5 Snap mechanism 6 Working fluid inlet 7 Working fluid outlet 8 Liquid inlet 9 Liquid outlet 15 Operating rod 16 Working fluid discharge valve 17 Operating lever Reference Signs List 19 working fluid introduction valve element 21 ejector 22 branch passage 25 suction chamber 28 steam trap 37 bypass pipe

Claims (1)

[Claims] A closed vessel is provided with a high-pressure working fluid inlet and a working fluid outlet, a liquid inlet and a liquid outlet to be fed under pressure, and according to the liquid level of the liquid stored in the sealed vessel. The working fluid inlet is opened and the working fluid outlet is closed, and the liquid collected in the sealed container is pumped from the liquid outlet to the outside of the sealed container. A branch passage is connected to the liquid outlet. Connecting the ejector to the branch passage, connecting the outlet side of the ejector to the liquid inlet, and connecting the suction chamber of the ejector to a liquid source for collecting the liquid. apparatus.