JPH06207593A - Hydraulically-driven type submerged pump - Google Patents

Abstract

PURPOSE:To prevent the occurrence of water hammer phenomenon owing to the rapid stop of a hydraulic motor by making passible continuance of rotation of a rotary shaft on the pump side by dint of inertia even when the output rotary shaft of the hydraulic motor is rapidly stopped. CONSTITUTION:The output rotary shaft 11 of a hydraulic motor 1 and rotary shaft 4 on the pump side are intercoupled through a centrifugal clutch 6 which is constituted such that high speed rotation is transmitted from the input side 61 to the output side 62 but low speed rotation is not transmitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulically driven submersible pump device driven by the rotational output of a hydraulic motor.

[0002]

2. Description of the Related Art A conventionally known hydraulically driven submersible pump device is shown in FIG. This is equipped with a hydraulic motor 1 and a pump-side rotating shaft 4 to which an impeller 3 of a pump body 2 is attached, and the output rotating shaft 11 and the pump-side rotating shaft 4 of the hydraulic motor 1 serve as a gear coupling or the like. It was integrally rigidly connected by the shaft joint 5. Therefore,
The pump side rotary shaft 4 is linked to the operating state of the hydraulic motor 1,
When the output rotary shaft 11 of the hydraulic motor 1 stops, the pump-side rotary shaft 4 also stops at the same time.

On the other hand, the output rotary shaft 11 of the hydraulic motor 1 has an extremely short rotation time due to inertia when the operation is stopped, as compared with the output rotary shaft of the electric motor. Therefore, when the rotation of the output rotary shaft 11 of the hydraulic motor 1 is suddenly stopped when the operation of the hydraulic motor-driven submersible pump is stopped, the impeller 3 is suddenly stopped together with the pump-side rotary shaft 4 and the water is lost. The hammer phenomenon is likely to occur, and if such a phenomenon occurs, the pipeline may be destroyed. Therefore, when the operation of the hydraulic motor driven submersible pump is stopped, control is performed such that the discharge pressure of the hydraulic pump (not shown) that is supplying hydraulic oil to the hydraulic motor 1 is gradually reduced.

[0004]

However, in the conventional hydraulically driven submersible pump device, the hydraulic hose between the hydraulic pump and the hydraulic motor is damaged during operation, or the engine driving the hydraulic pump has a problem. If a sudden drop in hydraulic pressure occurs due to such a situation, the output rotary shaft of the hydraulic motor suddenly stops due to these situations, and the water hammer phenomenon is likely to occur.

The present invention has been made in view of the above circumstances, and the output rotary shaft of the hydraulic motor and the pump-side rotary shaft are connected to each other as the output rotary shaft of the hydraulic motor changes from high speed rotation to low speed rotation. By using a clutch mechanism that releases the function of transmitting the rotation of the output rotary shaft to the pump-side rotary shaft, even if the output rotary shaft of the hydraulic motor suddenly stops, An object of the present invention is to provide a hydraulically driven submersible pump device that can continue to rotate due to inertia.

[0006]

In the hydraulically driven submersible pump apparatus according to the present invention, as the input side changes from low speed rotation to high speed rotation, the input side rotation is switched to the on state. A clutch mechanism that switches to a disengaged state in which the input side rotation is not transmitted to the output side as the input side changes from high speed rotation to low speed rotation, a hydraulic motor, and a pump side to which an impeller of the pump body is attached. A rotary shaft, the input side of the clutch mechanism is connected to the output rotary shaft of the hydraulic motor, and the output side of the clutch mechanism is connected to the pump side rotary shaft.

[0007]

In this configuration, the situation in which the output rotary shaft of the hydraulic motor suddenly stops during pump operation corresponds to the situation in which the input side of the clutch mechanism suddenly changes from high-speed rotation to low-speed rotation and then stops. Therefore, when the output rotary shaft of the hydraulic motor suddenly stops, the clutch mechanism is disengaged before the output rotary shaft stops, and even if the output rotary shaft of the hydraulic motor stops, the pump side rotary shaft does not move within a predetermined time. Continue rotation due to inertia. Further, the situation in which the output rotation shaft of the hydraulic motor is started and shifts to steady operation corresponds to the situation in which the input side of the clutch mechanism changes from low speed rotation to high speed rotation. Therefore, after the output rotary shaft of the hydraulic motor is started, the clutch mechanism is turned on, and the rotation of the output rotary shaft of the hydraulic motor is transmitted to the pump-side rotary shaft.

[0008]

FIG. 1 shows a hydraulically driven submersible pump device according to an embodiment of the present invention. This is a hydraulic motor 1
And a pump side rotary shaft 4 to which the impeller 3 of the pump body 2 is attached, and a clutch mechanism 6 connecting the output rotary shaft 11 of the hydraulic motor 1 and the pump side rotary shaft 4.

A centrifugal clutch is used for the clutch mechanism 6, and the input side 61 of the clutch mechanism 6 changes as the input side 61 changes from low speed rotation to high speed rotation.
Is switched to the ON state in which the rotation of is transmitted to the output side 62,
Further, it has a function of switching to a switching state in which the rotation of the input side 61 is not transmitted to the output side 62 as the input side 61 changes from high speed rotation to low speed rotation. The input side 61 of the clutch mechanism 6 is connected to the output rotary shaft 11 of the hydraulic motor 1, and the output side 62 is connected to the pump side rotary shaft 4.
Are linked to. Since the specific structure of the centrifugal clutch adopted in the clutch mechanism 6 is well known, its detailed description is omitted.

Reference numerals 71 and 72 denote bearings for supporting the rotary shaft 4 on the pump side, 73 is a mechanical seal, 8 is a bracket for supporting the bearings 71 and 72, 92 is a pump casing having guide vanes, and 9 is a suction port 91. It is a bell mouse.

With this configuration, the hydraulic oil is fed from the hydraulic pump (not shown) to the hydraulic motor 1, and the output rotary shaft 11 of the hydraulic motor 1 is started to shift to the steady operation. Since the side 61 changes from low speed rotation to high speed rotation, the clutch mechanism 6 switches from the disengaged state to the engaged state, and the rotation of the output rotary shaft 11 of the hydraulic motor 1 is transmitted to the pump side rotary shaft 4 via the clutch mechanism 6. Impeller 3
Rotates.

When the hydraulic motor 1 suddenly stops due to some trouble during the operation of the submersible pump accompanied by the rotation of the impeller 3, the output rotary shaft 11 immediately before the hydraulic motor 1 stops. Together with the input side 61 of the clutch mechanism 6
Changes rapidly from high speed to low speed. for that reason,
The clutch mechanism 6 is disengaged before the output rotary shaft 11 is completely stopped, and the pump side rotary shaft 4 continues to rotate due to inertia even if the output rotary shaft 11 is stopped within a predetermined time thereafter. . The above-mentioned troubles include breakage of the hydraulic hose between the hydraulic pump (not shown) and the hydraulic motor 1, troubles of the engine that drives the hydraulic pump, and the like. Therefore, even if the hydraulic motor 1 suddenly stops due to the occurrence of these troubles, the impeller 3 rotates inertially together with the pump-side rotating shaft 4 after the stop, so that the occurrence of the water hammer phenomenon is prevented, which causes the water hammer phenomenon. Accidents such as broken pipelines are also prevented.

In order to reliably prevent the occurrence of the water hammer phenomenon, the rotary shaft 4 on the pump side and the impeller 3 are switched to inertial rotation immediately before the hydraulic motor 1 suddenly stops due to some trouble, and these gradually rotate. It is effective to pass through the process of decelerating to the stop.
Therefore, in the submersible pump of the embodiment, as shown in FIG. 1, a cavity 10 is provided between the mounting positions of the bearings 71 and 72 on the bracket 8, and the cavity 10 is utilized to make the flywheel on the pump-side rotary shaft 4. 41 is provided. If this configuration is adopted, the inertia of the pump-side rotating shaft 4 is increased by the flywheel 41, so that the flyhole 41 gradually reduces the inertial rotation of the pump-side rotating shaft 4 and the impeller 3 when the hydraulic motor 1 suddenly stops. It helps prevent the water hammer from occurring, and reliably prevents the occurrence of the water hammer phenomenon.

Submersible pumps to which the present invention can be applied include various pumps such as spiral pumps and mixed flow pumps in addition to axial pumps. Further, as the clutch mechanism 6, as in the case of a centrifugal clutch, as the input side changes from low speed rotation to high speed rotation, the input side rotation is switched to the on state in which it is transmitted to the output side, and the input side changes from high speed rotation to low speed rotation. It is possible to use a device having a function of switching to a switching state in which the rotation of the input side is not transmitted to the output side as the rotation changes.

[0015]

According to the hydraulically driven submersible pump device of the present invention, the hydraulic hose between the hydraulic pump and the hydraulic motor is damaged during operation of the submersible pump, or trouble occurs in the engine driving the hydraulic pump. Even if the output pressure of the hydraulic motor suddenly stops due to a sudden drop in hydraulic pressure, the rotary shaft on the pump side continues to rotate within a specified time due to its inertia, making it less likely to cause the water hammer phenomenon. The risk of dribbling such as road damage is reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a hydraulically driven submersible pump device according to an embodiment of the present invention in a vertical section.

FIG. 2 is an explanatory view showing a conventional hydraulically driven submersible pump device with a part thereof cut away.

[Explanation of symbols]

 1 Hydraulic Motor 2 Pump Main Body 3 Impeller 4 Pump Side Rotating Shaft 6 Clutch Mechanism 11 Hydraulic Motor Output Rotating Shaft 61 Input Shaft 62 Output Shaft

Claims (1)

[Claims] 1. As the input side changes from low-speed rotation to high-speed rotation, the input-side rotation switches to an on-state in which the rotation is transmitted to the output side, and the input side changes from high-speed rotation to low-speed rotation. A clutch mechanism that switches to a disengaged state in which the rotation of the input side is not transmitted to the output side, a hydraulic motor, and a pump side rotating shaft to which an impeller of the pump body is attached, and the input side of the clutch mechanism is the output of the hydraulic motor. A hydraulically driven submersible pump device, wherein the output side of the clutch mechanism is connected to a rotary shaft, and the output side of the clutch mechanism is connected to a rotary shaft of the pump side.