JPS624732Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fluid coupling that is installed between a prime mover and a pump that receives fluid from a push tank to transmit rotational force.

[Conventional technology]

If the pump is a forced water supply type, there is naturally a forced tank above the pump, so
In a fluid coupling that uses a part of the fluid handled by the pump as working fluid, a collection pump is used to collect the fluid into the tank in order to reuse the drain.

[Problem that the invention aims to solve]

However, in such conventional systems, a separate collection pump was required in order to reuse the drain, resulting in a complicated structure, requiring space, and requiring time and effort to maintain.

The object of the present invention is to provide a fluid coupling that allows drain to be collected into a tank with an extremely simple structure.

[Means for solving problems]

The present invention is a fluid coupling that is installed between a prime mover and a pump that receives liquid from a forced tank located at a higher position to transmit rotational force. In a fluid coupling configured to supply water to the water supply port of the coupling, a jet pump is disposed inside a drain tank of the fluid coupling or outside via a suction pipe, and a part of the fluid discharged from the pump is guided to the water supply port of the jet pump. The fluid coupling is characterized in that the jet pump is used as a driving fluid and the fluid in the drain tank is supplied to the push tank.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. In the figure, reference numeral 1 denotes a prime mover consisting of, for example, a constant speed electric motor, and an impeller 3 is attached to the tip of a rotating shaft 2 thereof. A casing 4 is attached to the outer periphery flange portion of the impeller 3, and is configured to rotate together with the impeller 3. Several ejection nozzle holes 4a are bored in the outer circumference of the casing 4, and the working fluid (water in this embodiment) filled inside is ejected. Reference numeral 5 denotes a runner and is attached to the tip of a rotating shaft 7 of a pump 6, which is a driven machine, so that the pumps rotate together.

The impeller 3, casing 4, runner 5, etc. are surrounded by a box 8 to prevent water ejected from the ejection nozzle hole 4a from scattering. A water supply port 9 is provided on the side surface of the box 8, and water is supplied to the interior of the impeller 3, runner 5, and casing 4 through several water supply holes 3a formed in the boss portion of the impeller 3. ing. Also,
The rotating shafts 2 and 7 pass through both sides of the box 8, and a shaft sealing device 10 having a labyrinth structure is provided to prevent leakage of the jetted water.

The lower part of the box 8 is a drain tank 11, which stores water ejected from the ejection nozzle hole 4a as a drain. A jet pump 12 is disposed inside the drain tank 11, and a jet pump 12 is installed in the drain tank 11 to supply water to the push tank 14 via a return pipe 13.
It is now possible to send water to the drain. The push-in tank 14 is located above the pump 6 and is adapted to push water into the suction side of the pump 6 through a push-in pipe 15.

A water supply pipe 17 is branched from the discharge pipe 16 of the pump 6 and connected to the water supply port 9.
A constant flow valve 18 is inserted in the middle of the water supply pipe 17 to supply water at a predetermined flow rate to the water supply pipe 17. A bypass pipe line 19 branches off from the water supply pipe 17, and a part of the supply water, which is part of the fluid discharged from the pump 6, is sent to the jet pump 12 so that it can be used as driving water. A flow rate control valve 20 is inserted into the bypass pipe 19 to adjust the flow rate of water supplied to the water supply port 9. In the figure, 21 is a priming pipe, and 22 is an on-off valve thereof.

Since this embodiment is configured as described above,
First, when the prime mover 1 is started, the impeller 3 and the casing 4 are rotated via the rotating shaft 2, and are operated at the same rotational speed as the prime mover 1.

Next, when the on-off valve 22 is opened, the priming pipe 21
Priming water is supplied from the water supply port 9 to the water supply port 9. This priming water flows into the casing 4, and as the filling amount gradually increases, the runner 5 rotates, causing the pump 6 to rotate. When the pump 6 starts to rotate in earnest, water in the push tank 14 is poured into the pump 6 and discharged from the discharge pipe 16. A portion of the water from the discharge pipe 16 enters the water supply pipe 17 and is supplied to the water supply port 9 through a constant flow rate 18. In this way, when a portion of the water discharged from the pump 6 is fully supplied, the above-mentioned priming becomes unnecessary and the on-off valve 22 is closed.
By appropriately adjusting the control valve 20 of the bypass pipe 19, a constant amount of water supplied in the water supply pipe 17 is constantly supplied to the water supply port 9, and the rotation speed of the pump 6 can be controlled to be constant.

Further, a part of the supply water enters the inlet of the jet pump 12 as driving water through the bypass pipe line 19, and sucks the drain in the drain tank 11.
This is recovered and supplied into the push tank 14 via the return pipe 13.

Incidentally, the jet pump 12 may be disposed outside the drain tank 11 as shown by the chain line. In this case, the suction pipe 12a is connected from the drain tank 11, and the inside of the tank 11 is pumped by driving water from the bypass pipe 19. Pull in the drain of tank 14 and push it
to be discharged. Alternatively, the downstream end of the bypass pipe 19 may be opened into the drain tank 11 as it is, and the driving water for the jet pump 12 may be taken in from the water supply pipe 17 portion in front of the valve 18 through the lead-in pipe 23 as shown by the chain line. . Furthermore, the flow rate control valve 20 may be provided in the water supply pipe 17 as shown by the chain line. Furthermore, it is not prohibited to use a scoop tube in this device or to attach a bearing to the box 8 to support the rotating shaft. Furthermore, in the description of this specification as a whole (including the claims), the working fluid is explained as water, but oil,
All other fluids capable of transmitting liquid power are included in the present invention.

[Effect of idea]

This invention enables the fluid joint to recover the drain of the working fluid from the fluid joint into a push tank and reuse it without requiring a special collection pump, which has a simple structure, takes up less space, and requires less maintenance. can be provided.

[Brief explanation of the drawing]

The figure is an explanatory diagram showing an embodiment of the fluid coupling and its circuit device according to the present invention. 1... Prime mover, 2... Rotating shaft, 3... Impeller, 3a... Water supply hole, 4... Casing, 4a...
...Blowout nozzle hole, 5...Runner, 6...Pump,
7... Rotating shaft, 8... Box, 9... Water supply port,
10...Shaft sealing device, 11...Drain tank, 12
...Jet pump, 12a...Suction pipe, 13...
...Return piping, 14...Pushing tank, 15...
Push-in pipe, 16...Discharge pipe, 17...Water supply pipe, 1
8... Constant flow valve, 19... Bypass pipe line, 20...
...Flow control valve, 21...priming water piping, 22...
Opening/closing valve, 13... Lead pipe.

Claims (1)

[Scope of utility model registration request] A fluid coupling that is installed between a prime mover and a pump that receives liquid from a forced tank located higher than the prime mover to transmit rotational force, and in which a portion of the fluid handled by the pump is transferred to the water supply port of the fluid coupling. In the fluid coupling, a jet pump is disposed inside a drain tank of the fluid coupling or outside via a suction pipe, and a part of the fluid discharged from the pump is guided to serve as the driving fluid for the jet pump. ,
A fluid coupling characterized in that the fluid in the drain tank is supplied to the push tank by the jet pump.