JPS6128893Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an initial water supply device of a fluid coupling installed between a prime mover and a pump to transmit rotational force, and more specifically, an impeller connected to the rotating shaft of the prime mover, a casing attached to the impeller and having a plurality of ejection nozzle holes on the outer periphery; a runner provided opposite to the impeller and connected to the rotating shaft of the pump; a box surrounding the impeller, the casing, and the runner; The present invention relates to an initial water supply device for a fluid coupling, which includes a water supply port provided on the side and supplying a portion of fluid discharged from the pump into the casing.

Since the above-mentioned type of fluid coupling has a jet nozzle hole provided on the outer periphery of the casing, all of the working fluid in the casing is discharged in the stopped state. Therefore, when the pump is restarted, the rotation of the pump increases and an initial supply of water, that is, replenishment of priming water, is required until a portion of the discharged fluid is supplied.

In this invention, a supply tank is provided inside or outside the box of the fluid coupling, and a part of the working fluid supplied from the pump is always extracted from the tank to keep it full, so that it can be used as priming water at the time of startup. By doing so, it is an object of the present invention to provide an initial water supply device for a fluid coupling that can supply water within the fluid coupling itself and can reliably supply the necessary amount of priming water forever.

The present invention includes an impeller connected to the rotation shaft of a prime mover, a casing attached to the impeller and having a plurality of jet nozzle holes on its outer periphery, a runner installed opposite to the impeller and connected to the rotation shaft of a pump, and In a fluid coupling consisting of a box that surrounds an impeller, a casing, and a runner, and a water supply port that is provided on the side of the box and supplies a portion of the fluid discharged from the pump into the casing, a box that is located above the water supply port. This initial water supply device is characterized in that a replenishment tank is disposed inside or outside, and priming water is supplied to the water supply port at the time of startup.

An embodiment 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 of the impeller 3, and rotates integrally with the impeller 3. A plurality of 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, and discharges the water via a return pipe 12 to the suction water tank 13 of the pump 6. The downstream end of the return pipe 12 may be connected to the suction pipe 14 of the pump 6 as shown by the two-dot chain line.

A water supply pipe 16 branches off from the discharge pipe 15 of the pump 6 and is connected to the water supply port 9 . A flow rate control valve 17 is disposed in the middle of the water supply pipe 16. The flow rate control valve 17 narrows the opening when the discharge pressure of the pump 6 detected through the pressure detection pipe 18 exceeds the set pressure, and conversely widens the opening when the discharge pressure becomes lower than the set value. The amount of water supplied from the water supply port 9 to the water supply port 9 is controlled.

From the water supply pipe 16, a bypass pipe 19 is branched and connected directly to the water supply port 9 via a priming on-off valve 20, or it is connected to the water supply pipe 1 again before it.
6. A water intake pipe 21 is further branched from the bypass pipe 19 and supplies a portion of the water supply to a replenishment tank 22 disposed inside the box 8 above. The amount of water fed is controlled by an orifice 23, and when the fluid coupling is in operation, a slight overflow occurs from the replenishment tank 22, so that a constant amount of water is always stored.

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 priming on-off valve 20 is opened, the water stored in the supply tank 22 will flow into the pipes 21 and 19.
The water is supplied as priming water to the water supply port 9 through the water supply port 9. This priming water is applied to casing 4, impeller 3, runner 5
When the filling amount gradually increases, the runner 5
rotates, causing the pump 6 to rotate. When the pump 6 begins to rotate in earnest, water in the suction water tank 13 is sucked up through the suction pipe 14 and discharged from the discharge pipe 15. A portion of the water from the discharge pipe 15 enters the water supply pipe 16 and is supplied to the water supply port 9 through the flow rate control valve 17. When part of the water discharged from the pump 6 is fully supplied in this way, the above-mentioned priming water is no longer necessary, so the on-off valve 20 is closed and the priming water for the next operation start is stored in the supply tank 22 again. I'll keep it.

As described above, when full-scale water supply is performed through the water supply pipe 16, the flow rate control valve 17 controls the water supply amount according to the discharge pressure or discharge flow rate of the pump 6, and controls the rotation speed of the pump 6. .

The water ejected from the ejection nozzle hole 4a of the casing 4 is collected in a drain tank 11 provided at the bottom of the box 8, and is returned to the suction water tank 13 or the suction pipe 14 as shown by the two-dot chain line, and is sent again by the pump 6. Ru.

The replenishment tank 22 may be located either inside or outside the box 8 as long as it is located above the water supply port 9. Further, the on-off valve 20 may be configured as a solenoid valve, and may be automatically opened when the prime mover 1 is started. Furthermore, the method of supplying water to the supply pipe 16 is not limited to the above embodiment; water may be stored in an overflow tank and then supplied as a constant pressure water supply, water may be taken from the discharge pipe 15 via a constant pressure valve, or water may be supplied from the discharge pipe 15 via a constant pressure valve. If the pump is a centrifugal pump, water at approximately constant pressure may be taken from the balance hole chamber. Furthermore, the valve 17 may be operated after converting the discharge pressure or flow rate into an electrical signal, or may be manually controlled. Further, this device does not preclude the use of a scoop tube or the attachment of bearings to the box 8 to support the rotating shafts 2 and 7. Further, in the description of this specification as a whole (including the claims), the working fluid is described as water, but the present invention includes all fluids capable of transmitting power such as oil and other liquids.

As described above, the present invention is a compressor comprising an impeller connected to a rotating shaft of a prime mover, a casing attached to the impeller and having a plurality of ejection nozzle holes on the outer periphery,
This is an initial water supply device in a fluid coupling consisting of a runner disposed opposite the impeller and connected to the rotating shaft of the pump, a box surrounding the impeller, casing and runner, and a water supply port provided on the side of the box for supplying a portion of the fluid discharged from the pump into the casing, wherein a supply tank is disposed inside or outside the box above the water supply port, and priming water is supplied to the water supply port at start-up.This not only eliminates the need for an external priming water source or a special priming device, but also has the advantages of ensuring that the required amount of priming water is obtained, being simple in structure and free from risk of breakdown.

[Brief explanation of the drawing]

The figure is an explanatory view showing an embodiment of the initial water supply device for the fluid coupling of 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
... Return pipe, 13 ... Suction water tank, 14 ... Suction pipe, 15 ... Discharge pipe, 16 ... Water supply pipe, 17 ...
Flow rate control valve, 18... Pressure detection pipe line, 19... Bypass pipe line, 20... Prime water on-off valve, 21...
Water intake pipe, 22...supply tank, 23...orifice.

Claims (1)

[Scope of utility model registration request] an impeller connected to a rotating shaft of a prime mover; a casing attached to the impeller and having a plurality of jet nozzle holes on its outer circumference; a runner attached to the impeller and connected to a pump rotating shaft; In a fluid coupling consisting of a box surrounding the runner and a water supply port provided on the side of the box for supplying a portion of the fluid discharged from the pump into the casing, the water supply port is connected to the inside or outside of the box above the water supply port. An initial water supply device characterized in that a replenishment tank is provided and priming water is supplied to the water supply port at the time of startup.