JPH06257587A - Method for detecting operating condition of pump and method for supplying lubricating water to pump bearing - Google Patents

Abstract

(57) [Summary] [Purpose] The operating conditions of the pump 1 such as normal drainage operation and air operation are accurately detected, and the bearings 5 of the main shaft 2 are
No waste of supplying the lubricating water is eliminated during the drainage operation in which the supplying of the lubricating water is unnecessary. [Structure] At least one of a supercharging pressure, a supercharging amount, and a rotation speed of a supercharger 11 which has a constant relationship with an operating condition of the pump 1.
Is detected by the detecting means 12, the operating condition of the pump is detected based on the signal value detected by the detecting means 12, and the supply of lubricating water to the bearings 5, 8 of the main shaft 2 of the pump 1 is stopped. I'm trying to control.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting the operating condition of a pump and a method for supplying lubricating water to a pump bearing.

[0002]

2. Description of the Related Art For example, as a bearing of a vertical shaft pump, a ceramic bearing which is lubricated and cooled by self-pumping water and can perform stable operation is adopted. In this type of bearing, after a very short time immediately after the start of the pump, the bearing is immediately lubricated and cooled by the self-pumping water to start stable operation. That is, since the dry operation is limited to a short time, wear and seizure of the ceramic bearing can be avoided and stable operation can be performed.

On the other hand, with the rapid progress of urbanization, the amount of rainwater flowing into the drainage pump station installed in the waterway is becoming large and rapid. Under such a situation, even if the water level of the suction well at the pumping station drops to the pumping cutoff level of the vertical pump, dry operation is continued and the preceding standby operation and air management operation that precede the operating state of the pump are performed. Corresponding by The vertical shaft pump used for the preceding standby operation and the air management operation is dry-operated for a long time, and during this period, the lubricating water is not supplied to the bearing. Therefore, it was not possible to adopt a ceramic bearing in which the dry operation is limited to a short time for the vertical shaft pump that performs the preceding standby operation and the air management operation.

As a means for solving such a problem, it is conceivable to supply lubricating water to the bearing from the outside, but in this case, even though the pumping operation (draining operation) is being performed from the outside, It is meaningless to continue supplying lubricating water. Therefore, by measuring the water level of the intake well, if the water level becomes lower than the preset water level, that is, if it drops to a level lower than the pumping start water level of the vertical pump, the lubricating water for the bearing Was adopted. However, in the method of supplying lubricating water to the bearing based on the water level of the suction well in this way, it is necessary to consider the case where the water surface of the suction well is calm and the case where the surface of the suction well is swelling, and usually the swelling In consideration of such cases, it was necessary to set the supply level for stopping the supply of lubricating water to a high level with a margin.

However, in such a control method, when the water surface is relatively calm, the lubricating water is supplied even during the pumping operation. That is, since the operating condition of the pump cannot be accurately detected, useless supply of lubricating water is performed.

[0006]

The problems to be solved are that the operating condition of the pump cannot be accurately detected and that the operating condition of the pump cannot be accurately detected. This is the point where wasteful lubrication water is supplied.

[0007]

According to a first aspect of the present invention, in an engine driven pump, a detecting means for detecting at least one of a supercharging pressure, a supercharging amount and a rotational speed of a supercharger attached to the engine. Is provided, and the operating status of the pump is detected based on at least one signal value of the supercharging pressure, supercharging amount, and rotational speed detected by the detecting means. To achieve the purpose of detecting.

According to a second aspect of the present invention, in the engine-driven pump, there is provided detection means for detecting at least one of supercharging pressure, supercharging amount and rotation speed of a supercharger attached to the engine. The supply stop of the lubricating water from the lubricating water supply system to the bearing of the pump main shaft is controlled based on the signal value of at least one of the supercharging pressure, the supercharging amount and the rotational speed detected by the bearing. Achieved the purpose of eliminating waste of lubricating water supply to

[0009]

According to the invention of claim 1, the supercharging pressure, the supercharging amount and the rotational speed of the supercharger attached to the engine can be detected by the detecting means. On the other hand, the engine load, the supercharging pressure of the supercharger, the supercharging amount, and the supercharger rotation speed with respect to the operating state of the pump have a fixed relationship. That is, in the regular drainage operation state of the pump in which 100% drainage is secured, the engine load, the supercharging pressure of the supercharger, the supercharging amount, and the rotation speed each exceed a predetermined value, and the pump is idle. In the air operation state, the engine load, the supercharging pressure of the supercharger, the supercharging amount, and the rotation speed are smaller than predetermined values. Therefore,
The normal drainage operation status can be detected by detecting a state in which at least one or more of the supercharging pressure, the supercharging amount, and the rotation speed of the supercharger becomes larger than a predetermined value by the detection means. Further, by detecting a state in which at least one or a plurality of values of the supercharging pressure, the supercharging amount, and the rotation speed of the supercharger becomes smaller than a predetermined value by the detecting means,
It can detect the driving situation in the air.

According to the second aspect of the present invention, the detection means detects that the supercharging pressure, the supercharging amount, and the rotational speed of the supercharger are at least one or more than a predetermined value. Stop the supply of lubricating water during the drainage operation of
Lubricating water can be supplied during the air operation in which the detection unit detects the state in which at least one or more of the supercharging pressure, the supercharging amount, and the rotation speed of the supercharger becomes smaller than the predetermined value.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration diagram of a vertical shaft pump to which the present invention is applied. A main shaft 2 of the pump 1 is a bearing 5 fixed to a base portion of a guide vane 4 on an upper side of an impeller 3 and a floor surface 7 of an absorption well 6. It is rotatably supported by bearings 8 fixed at the same height level, and is rotationally driven by, for example, a diesel engine 9 via a speed reducer 9A. The bearings 5 and 8 are each made of ceramics such as silicon carbide, and lubricating water for lubrication and cooling is supplied to each of them from a lubricating water supply system 10. The lubricating water supply system 10 includes a lubricating water supply source 10A and the lubricating water supply source 1
A pipe line 10B for supplying lubricating water from 0A to the bearings 5 and 8;
It is constituted by a valve 10C such as an electromagnetic valve or an electric ball valve provided in the conduit 10B. Therefore, the valve 10
Lubricating water is supplied from the lubricating water supply source 10A to the bearings 5 and 8 when the valve C is opened, and the supply of lubricating water to the bearings 5 and 8 is stopped when the valve 10C is closed.

On the other hand, a supercharger 11 is attached to the engine 9, and the supercharging pressure of the supercharger 11 is detected by a detection sensor (for example, pressure relay) 12a of the detection means 12, and the detection signal is sent to the control device 13. Is entered. The control device 13 has a comparator circuit 14 and a setting device 15 having a selector. The reference value of the boost pressure is input to the comparison circuit 14 from the setting device 15. The comparison circuit 14 compares the reference value of the supercharging pressure input from the setter 15 with the value of the supercharging pressure input from the detecting means 12, and determines the value of the supercharging pressure input from the detecting means 12. When it is larger than the reference value, the closing signal Sh for closing the valve 10C is output, the display signal is output to the first display 16, and the value of the supercharging pressure input from the detecting means 12 is larger than the reference value. Is smaller, the valve opening signal 0p for opening the valve 10C is output and the display signal is output to the second indicator 17.

Next, a method of detecting the operating state of the vertical shaft pump and a method of supplying lubricating water to the bearings 5 and 8 will be described. The supercharging pressure of the supercharger 11 attached to the engine 9 can be detected by the detecting means 12. On the other hand, the load of the engine 9 and the supercharging pressure of the supercharger 11 with respect to the operating condition of the pump 1 have a constant relationship. That is, in the normal drainage operation state of the pump 1 in which 100% drainage is secured, the load of the engine 1 and the supercharging pressure of the supercharger 11 become larger than the reference value. This state is detected by the intake pressure detection means 12 and input to the comparison circuit 14 of the control device 13. Comparison circuit 1
In step 4, the reference value of the supercharging pressure input from the setter 15 is compared with the value of the supercharging pressure input from the detecting means 12.
In the normal drainage operation state, since the value of the supercharging pressure input from the detection means 12 is larger than the reference value, the closing signal Sh for closing the valve 10C is output and the first display 1 is also provided.
A display signal is output to 6 to detect the normal drainage operation status of the pump 1. In this case, the bearings 5 and 8 are lubricated and cooled by the self-lifted water sucked up by the impeller.

On the other hand, when the pump 1 is idle, the load of the engine 1 and the supercharging pressure of the supercharger 11 become smaller than the reference value. This state is the intake pressure detecting means 12
Is detected by the control circuit 13 and input to the comparison circuit 14 of the control device 13. The comparison circuit 14 compares the reference value of the boost pressure input from the setter 15 with the value of the boost pressure input from the detection means 12. In the air operation state, the value of the supercharging pressure input from the detection means 12 is smaller than the reference value, so the valve 1
Output the valve closing signal Op that opens 0C and
A display signal is output to the display unit 17 to detect the air operation status of the pump 1. By opening the valve 10C,
Lubricating water is supplied from the lubricating water supply source 10A to the bearings 5 and 8 to lubricate and cool the bearings 5 and 8.

As described above, during the air operation of the pump 1, the lubricating water supplied from the lubricating water supply source 10A lubricates and cools the bearings 5 and 8, so that the dry operation is continued for a long time. The ceramic bearings 5 and 8 can also be used for the vertical pump 1 that performs standby operation and air management operation.

In the above embodiment, the supercharging pressure of the supercharger 11 detected by the detecting means 12 is input to the control device 13 to detect the operating condition and supply or cut off the lubricating water. However, the present invention is not limited to the above embodiment, and the detection means 12 detects the supercharging amount or the rotation speed of the supercharger 11 by the detection means 12 and inputs it to the control device 13. , A method of detecting the operating condition or supplying or shutting off the lubricating water, or boost pressure,
It is also possible to detect two or three of the supercharging amount or the number of revolutions at the same time and input them to the control device 13 to detect the operating condition and supply or cut off the lubricating water.

Needless to say, the present invention can be applied not only to the vertical shaft pump 1 described in the above embodiment, but also to other pumps capable of performing air operation.

[0018]

As described above, according to the first aspect of the invention, the engine load, the supercharging pressure of the supercharger, the supercharging amount, and the supercharger rotation speed, which have a constant relationship with the operating condition of the pump. Since the normal drainage operation or the air operation is detected based on the above, it is possible to accurately detect the operation status of the pump. According to the invention of claim 2, the lubricating water supply system is closed during the normal drainage operation in which the bearing can be lubricated and cooled by the self-pumping water, so that the lubrication and cooling of the bearing by the self-pumping water cannot be performed. During medium operation, the lubrication water supply system is opened to lubricate and cool the bearings with the lubrication water supplied from this system, so ceramic bearings are used in pumps that perform preceding standby operation and air management operation. Will be possible. Moreover, since the amount of lubricating water supplied to the bearing can be suppressed to the necessary minimum, there is an advantage that the lubricating water and the power for supplying the lubricating water can be saved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a vertical shaft pump to which an embodiment of the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump 2 Main shaft 5 Bearing 8 Bearing 9 Diesel engine (engine) 10 Lubricating water supply system 11 Supercharger 12 Detection means

Claims (2)

[Claims] 1. An engine driven pump is provided with a detection means for detecting at least one of a supercharging pressure, a supercharging amount and a rotation speed of a supercharger attached to the engine, and the overpressure detected by the detection means is provided. A method for detecting the operating condition of a pump, wherein the operating condition of the pump is detected based on at least one signal value of the supply pressure, the supercharging amount and the rotational speed. 2. An engine driven pump is provided with a detection means for detecting at least one of a supercharging pressure, a supercharging amount, and a rotation speed of a supercharger attached to the engine, and the overpressure detected by the detection means is provided. Lubricating water to a pump bearing, characterized in that the supply stop of the lubricating water from the lubricating water supply system to the bearing of the pump main shaft is controlled based on at least one signal value of the supply pressure, the supercharging amount and the rotational speed. Supply method.