JPH09112486A - Drainage pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To aim at the promotion of space-saving in a setup area as pumping installation by reducing the measure of system capacity in eliminating a bevel gear train form the components of a speed reducer. SOLUTION: A speed reducer 100 is equipped with an input shaft to be connected to a gas turbine 11, and output shaft to be connected to a pump driving shaft 3 with a proper angle in a gap with this input shaft, a hydraulic pump using the said input shaft as a main shaft, a hydraulic motor where this main shaft rotating after receiving hydraulic pressure produced in this hydraulic pump situated concentrically or in parallel with the said output shaft, a hydraulic passage system forming a circulating circuit of hydraulic fluid in an interval between the hydraulic motor and the hydraulic pump, and a gear train forming a proper reduction gear ration in space between the main shaft of the hydraulic motor and the output shaft, respectively.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to, for example,
Centrifugal pumps, centrifugal pumps used in power plants, etc.
The present invention relates to a drainage pump using a mixed flow pump, an axial flow pump, or the like.

[0002]

2. Description of the Related Art An example of a conventional drainage pump is shown in FIG. This is one in which a prime mover 2 such as a gas turbine or a diesel engine is arranged above a spiral pump 1 which is an example of a pump, and a pump drive shaft 3 connected to an impeller 1a of the spiral pump 1 has a vertical direction. Extends to. Also, for example, in a pump station of the lower drainage system, the load acting on the pump is significantly different between the normal operation and the standby operation, and the torsional vibration of the diesel engine is absorbed and the start of the single-shaft gas turbine is started. In order to secure torque, a prime mover 2 such as a diesel engine or a gas turbine and a centrifugal pump 1 are interlockingly connected to a pump drive shaft 3 via a fluid coupling 4 and a bevel gear reducer 5. The fluid coupling 4 has a clutch function, and the bevel gear reducer 5
Is equipped with a bevel gear train that changes the input / output direction.

In the above structure, the impeller 1a is rotated via the fluid coupling 4, the bevel gear reducer 5 and the pump drive shaft 3 by driving the prime mover 2. As a result, the liquid is sucked into the volute pump chamber 6 from the suction port 6a of the centrifugal pump 1 in the direction of arrow A, and the sucked liquid is subjected to centrifugal force by the impeller 1a and discharged from the discharge port 6b by arrow B.
Pumped in the direction.

[0004]

In the above-described conventional configuration, the bevel gear reducer 5 includes a bevel gear train as a component, so that the positions where the components are arranged are mutually spatial. Since the input shaft and the output shaft are constrained in a fixed positional relationship, the relative direction and position of the input shaft and the output shaft are limited, and the presence of the bevel gear train has been a factor that causes the volume of the bevel gear reducer 5 to increase.

The present invention has been made to solve the above-mentioned problems, and eliminates the bevel gear train from the constituent elements of the speed reducer to reduce the volume of the apparatus and to save the installation area of pump equipment. The purpose is to provide.

[0006]

In order to solve the above-mentioned problems, in the drainage pump of the present invention, the pump drive shaft is driven by the prime mover arranged in the horizontal direction through the speed reducer for converting the input / output direction. A drainage pump, wherein the speed reducer includes an input shaft connected to a prime mover, an output shaft connected to a pump drive shaft with an appropriate angle between the input shaft, and a hydraulic pressure having the input shaft as a main shaft. A pump, a hydraulic motor having a main shaft that is rotated by receiving the hydraulic pressure generated by the hydraulic pump and is concentric or parallel to the output shaft, and a hydraulic flow path that forms a hydraulic oil circulation circuit between the hydraulic motor and the hydraulic pump. The system includes a system and a gear train that forms an appropriate reduction gear ratio between the main shaft of the hydraulic motor and the output shaft.

In the hydraulic flow path system, a bypass path is provided between the forward path and the return path, and open / close valves are provided at the downstream side of the forward path and the upstream side of the return path, respectively, with the bypass path as a boundary. The clutch function is exerted by appropriately operating each on-off valve and returning the hydraulic pressure generated by the hydraulic pump to the return path through the bypass path.

Here, the hydraulic pump includes a gear pump, a vane pump, a screw pump, and the like, and the hydraulic motor includes a gear motor, a vane motor, and the like. With the above configuration, the rotational driving force transmitted from the prime mover to the input shaft is
After being converted into hydraulic pressure in the hydraulic pump, transmitted to the hydraulic motor through the hydraulic flow path system, converted into rotational driving force in the hydraulic motor and then transmitted to the output shaft via the gear train,
Rotates the pump drive shaft.

Since the power transmission system between the input shaft and the output shaft has a structural member called a hydraulic flow path system whose shape can be easily changed, the input shaft and the output shaft have a relative positional relationship. It can be set arbitrarily, and the pump and the prime mover can be arranged at arbitrary positions. Further, in deceleration, it is possible to omit the conventional bevel gear train, reduce the volume of the device, and save the installation area.

Further, the clutch function is exerted according to the operating state of the pump and the load fluctuation, and the input of the prime mover to the reduction gear is controlled.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. The structure of the main part of the pump is the same as that described with reference to FIG. 1 to 3, a gas turbine 11 as a prime mover for driving the centrifugal pump 1 is horizontally arranged above a pump drive shaft 3 extending in the vertical direction of the centrifugal pump 1. This prime mover may be a diesel engine.

The gas turbine 11 is arranged horizontally and has an output section 1 containing a gas generator 11a and an output turbine.
1b is positioned concentrically or in parallel with each other, and an output shaft 11c extending horizontally from each output portion 11b has a speed reducer 10.
It is linked to the pump drive shaft 3 via 0.

In the speed reducer 100, a hydraulic pump 112, a hydraulic motor 113, and a speed reducer 114 are installed at appropriate positions on a base 115. The input shaft 116 connected to the prime mover constitutes the main shaft of the hydraulic pump 112, and the main shaft of the speed reducer 114 constitutes the output shaft 117 connected to the vertical shaft pump or the like.
7 has an appropriate angle with the input shaft 116. The hydraulic pump 112 includes a gear pump, a vane pump, a screw pump, and the like, and the hydraulic motor 113 includes a gear motor, a vane motor, and the like.

Between the hydraulic pump 112 and the hydraulic motor 113, there is provided a hydraulic flow path system 118 that forms a circulation circuit for hydraulic oil. The hydraulic motor 113 receives the hydraulic pressure generated by the hydraulic pump 112 and its main shaft rotates. However, this spindle is the output shaft 11
It is located concentrically with or parallel to 7. Reducer 114
Is equipped with a gear train composed of parallel gears or planetary gears that forms an appropriate reduction gear ratio between the main shaft 113a of the hydraulic motor 113 and the output shaft 117.

A clutch mechanism 119 is provided in the middle of the hydraulic flow path system 118. The clutch mechanism 119 is provided with a bypass 120 between the forward path 118a and the return path 118b, and is provided in the middle of the bypass path 120, on the downstream side of the forward path 118a with the bypass path 120 as a boundary, and on the upstream side of the return path 118b. On-off valves 121a, 121b, 121c are provided, and each on-off valve 121a, 121b, 12 is provided.
The clutch function is exhibited by appropriately operating 1c to return the hydraulic pressure generated by the hydraulic pump 112 to the return path 118b through the bypass path 120.

The operation of the above configuration will be described. The on-off valve 1 of the bypass 120 in the clutch engaged state
21a is closed, and the open / close valves 121b and 121c of the forward path 118a and the return path 118b are opened. In this state, the rotational driving force transmitted from the gas turbine 11 to the input shaft 116 is converted into hydraulic pressure in the hydraulic pump 112, and then transmitted to the hydraulic motor 113 through the outward path 118a of the hydraulic flow passage system 118, and the rotational driving force is transmitted in the hydraulic motor 113. After being converted into, the main shaft 113a is transmitted to the output shaft 117 via the gear train of the speed reducer 114, and the impeller 1a is rotated via the pump drive shaft 3. As a result, liquid is sucked in the direction of arrow A from the suction port 6a of the centrifugal pump 1 into the spiral pump chamber 6, and the sucked liquid is subjected to centrifugal force by the impeller 1a to move in the direction of arrow B from the discharge port 6b. Pumped.

In the clutch disengaged state, the bypass 1
On-off valve 121a of 20 is opened, and forward path 118a and return path 1
The on-off valves 121b and 121c of 18b are closed. In this state, the hydraulic pressure generated in the hydraulic pump 112 is
It recirculates to the return path 118b through 0, and the rotational driving force is not transmitted to the output shaft 117.

Although an angle of 90 degrees is provided between the input shaft 116 and the output shaft 117 in this embodiment, this angle can be set arbitrarily. The speed reducer 114 may be arranged directly below the hydraulic pump 112.

[0019]

As described above, according to the present invention, since the input shaft and the output shaft of the speed reducer are connected via the power transmission system, which is a hydraulic flow path system and whose shape can be easily changed, the relative speed is reduced. The physical relationship can be set arbitrarily, and the pump and the prime mover can be arranged at arbitrary positions. Further, in the speed reducer, the bevel gear train as in the prior art can be omitted to reduce the volume of the device and save the installation area of the pump equipment.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a drainage pump according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a speed reducer according to the same embodiment.

FIG. 3 is a schematic view showing a clutch mechanism of the speed reducer in the same embodiment.

FIG. 4 is a schematic diagram showing a conventional drainage pump.

[Explanation of symbols]

 1 Volute Pump 3 Pump Drive Shaft 11 Gas Turbine 100 Reducer 112 Hydraulic Pump 113 Hydraulic Motor 114 Reducer 116 Input Shaft 117 Output Shaft 118 Hydraulic Passage System 119 Clutch Mechanism 120 Bypass Passage 121a, 121b, 121c Open / Close Valve

Claims (2)

[Claims] 1. A drainage pump for driving a pump drive shaft through a speed reducer for converting an input / output direction by a horizontally arranged prime mover, wherein the speed reducer includes an input shaft connected to the prime mover, and An output shaft connected to the pump drive shaft at an appropriate angle with the input shaft, a hydraulic pump having the input shaft as a main shaft, and a main shaft that rotates by receiving hydraulic pressure generated by the hydraulic pump is the output shaft. A hydraulic motor located concentrically or in parallel, a hydraulic flow passage system forming a hydraulic oil circulation circuit between the hydraulic motor and the hydraulic pump, and an appropriate reduction ratio between the main shaft of the hydraulic motor and the output shaft. A drainage pump comprising a gear train to be formed. 2. A hydraulic flow path system, wherein a bypass path is provided between a forward path and a return path, and open / close valves are provided at a downstream side of the forward path and an upstream side of the return path, which are defined by the bypass path as a boundary.
The drainage pump according to claim 1, wherein the drainage pump is configured to exert a clutch function by appropriately operating each on-off valve and returning the hydraulic pressure generated by the hydraulic pump to the return path through the bypass path.