JP2005120925A - Pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump device allowing easy gap adjustment between an impeller and a guide vane without rotating a motor. <P>SOLUTION: A gap adjusting member is mounted on the outer diameter of a pumping inlet portion of the impeller and the guide vane is fixed to a casing in such a state that the gap adjusting member is mounted thereon. After the guide vane is fixed to the casing, the gap adjusting member is removed from the outer diameter of the pumping inlet portion of the impeller. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric pump device, and more particularly to a turbine pump type guide vane mounting structure in an automatic pump device.

  Generally, the pump part of a turbine pump is composed of a motor, a casing, an impeller, and guide vanes. The impeller is rotationally driven by a motor and gives speed and pressure to the pumped water by centrifugal force. The guide vane efficiently guides the pumped water from the impeller to a casing that also serves as a spiral chamber, and converts the speed energy of the pumped water into pressure energy. The guide vane is positioned so as to cover the outer periphery of the impeller, and the clearance is adjusted and fixed to the casing so as not to contact the outer diameter portion of the pumping inlet portion of the impeller.

  A conventional turbine pump uses an induction motor as a motor that rotationally drives an impeller, and performs automatic operation by a combination of a pressure tank and a pressure switch. The method for adjusting the clearance between the impeller and the guide vane in this type of pump device is generally a method in which the operator manually rotates the motor shaft and confirms whether the impeller and the guide vane are in contact with each other by hearing and touch. Met.

JP-A-8-121343

  In the conventional pump device described above, the clearance adjustment between the impeller and the guide vane is confirmed by the operator's audibility and tactile sensation.

  In recent years, pumps that perform rotation speed control using inverters for the purpose of energy saving, constant discharge pressure control, and low noise are increasing. This pump employs a DC brushless motor as a motor that rotationally drives the impeller.

  In the DC brushless motor, the rotor is a magnetic body, and the stator has a winding. The magnetic flux density increases or decreases depending on the number and position of the magnet poles and positions of the rotor and the slots formed in the stator, and the cogging torque (attempts to rotate the rotor) Force) is required.

  The higher the output of the motor, the higher the magnetic performance, the higher the magnetic flux density and the higher the cogging torque. Therefore, since the motor shaft cannot be manually rotated like the induction motor, the high output motor is accompanied by a very difficult work of energizing and forcibly rotating the motor to adjust the clearance between the impeller and the guide vane.

  An object of the present invention is to provide a pump device that can easily adjust a gap between an impeller and a guide vane without rotating a motor.

  In order to achieve the above object, a feature of the present invention is that a guide has an impeller that is rotationally driven by a motor and is fixed to a casing that covers the outer periphery of the impeller and forms an outer shell. In a pump device having a pump part having a vane and a pressure tank for stocking water pressurized by the pump part, a gap adjusting member is attached to an outer diameter part of a pumping inlet part of the impeller to adjust the gap. The guide vane is fixed to the casing in a state where a member is mounted.

  According to the present invention, by using the gap adjusting member between the impeller and the guide vane, the gap adjustment between the impeller and the guide vane can be easily performed without rotating the motor.

  Further, according to the present invention, regardless of the type of motor such as an induction motor or a DC brushless motor, even a beginner in assembly and service can easily adjust the clearance between the impeller and the guide vane.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings.

  What has been described so far has described the pump device that uses an induction motor as the motor that rotationally drives the impeller, and the pump device that uses a DC brushless motor to control the rotational speed by an inverter. A pump device that performs numerical control will be described as an example. Although description of the pump apparatus by an induction motor is abbreviate | omitted, the effect of this invention can be acquired similarly.

  First, the outline | summary of the pump apparatus of this invention is demonstrated using FIGS. 1-3. The pump device includes a pressure tank 1 for stocking water pressurized by the pump unit, a motor 2 disposed on the pressure tank 1, and a control board on which an inverter for changing the rotation speed of the motor 2 is mounted. 3 and a pump cover 4 covering them.

  In the pump unit 10, a motor 2 is fixed to a casing 11 that also serves as a spiral chamber constituting an outer shell, and an impeller 12 is screwed to a shaft 2 a of the motor 2.

  On the outer periphery of the impeller 12, a guide vane 13 is fixed to the casing 11 with a screw or the like. A casing cover 14 is provided on the front surface of the casing 11 to cover the casing 11. The casing 11 is provided with a suction flange 15 serving as a suction port for pumped water, and a pressure flange 16 for returning a part of the pumped water whose pressure is increased by the impeller 12 and the guide vane 13 to the suction side.

  On the other hand, a discharge flange 5 for connecting a pipe provided for feeding water pressurized by the pump unit 10 to the faucet is connected to the side surface of the pressure tank 1.

  A screw-type priming water supply plug 17 is provided on the upper portion of the casing 11. The priming water supply plug 17 is removed to perform priming. When the power is turned on and the pump device is operated, the pumped water is sent out from the discharge pipe via the discharge flange 5. When the flow path connected to the discharge pipe is closed, the downstream pressure from the discharge pipe rises. Normally, the pressure sensor 6 or the like is activated and the motor 2 is stopped.

Next, an outline of the operation of the pump device of the present invention will be described with reference to FIG. When the faucet is opened at T1 and water is used from the standby state, the water stored in the pressure tank 1 is washed away and the pressure detected by the pressure sensor 6 provided in the pump device is as shown in (c). And the discharge pressure of the pump gradually decreases as shown in (b). As a result,
The operation is started when the operation start pressure T2 is reached. Depending on the opening of the faucet, that is, the amount of water used, the detected pressure of the pressure sensor 6 also decreases, the motor 2 is rotated at the control board 3 and the pump device is operated while keeping the discharge pressure constant. Yes. When the amount of water used is reduced at T3, the pressure detected by the pressure sensor 6 increases, so the number of revolutions of the motor 2 is reduced, and similarly the operation is performed while keeping the discharge pressure of the pump device constant. ing. Similarly, when the amount of water used increases again at T4, even when the amount of water used becomes constant at T5, the rotational speed of the motor 2 is changed according to the detected pressure of the pressure sensor 6 according to each situation. The discharge pressure of the pump device is constant, and the pump device is operated repeatedly.

  Then, when the faucet is closed at T6 and the use of water is finished, the pressure detected by the pressure sensor 6 increases instantaneously, so that the rotation speed of the motor 2 is reduced. At this time, in order to determine whether water is used or not, after slightly increasing the rotation speed of the motor 2 at T7, the rotation speed of the motor 2 is kept constant between T8 and T9, and the pressure detected by the pressure sensor 6 decreases during this time. After confirming that there is no change in direction, the pump device is stopped at T9 and enters a standby state.

  Next, the main part of the present invention will be described. The pump part of the conventional turbine pump is comprised from the motor 2, the casing 11, the impeller 12, and the guide vane 13, as shown in the expanded sectional view of FIG.

  The impeller 12 is rotationally driven by the motor 2 and applies speed and pressure to the pumped water by centrifugal force. The guide vane 13 guides the pumped water from the impeller 12 to the casing 11 that also serves as a spiral chamber, and converts the speed energy of the pumped water into pressure energy.

  In the assembly procedure, first, the motor 2 is fixed to the casing 11 from the direction A with a bolt or the like. Next, the impeller 12 is inserted from the B direction and screwed onto the shaft 2 a of the motor 2. Next, the guide vane 13 is inserted so as to cover the impeller 12 from the B direction. When the guide vane 13 is inserted into the impeller 12, it is necessary to make a clearance L so that the cylindrical outer diameter portion 12 a of the impeller 12 and the cylindrical insertion hole 13 a of the guide vane 13 do not contact each other. The larger the gap L, the better the assemblability, but the water pressurized by the impeller 12 escapes from the gap, causing the pump efficiency to drop. It is necessary to ensure about 0.15 to 0.2 mm for the gap L.

  As an adjustment method of the clearance L, in the case of an induction motor, an operator manually rotates the shaft 2a of the motor 2 so that the cylindrical outer diameter portion 12a of the impeller 12 and the cylindrical insertion hole 13a of the guide vane 13 are obtained. A method of confirming whether or not the touch is in contact with the sense of hearing and touch is common. This method largely depends on the skill level of the operator, and is difficult for beginners of assembly and service.

  Further, in the case of the induction motor described in this embodiment, since the cogging torque is required as described above, the motor shaft cannot be manually rotated like the induction motor. Therefore, it is extremely difficult to adjust the clearance L so that the motor is forced to rotate once and the impeller 12 and the guide vane 13 do not come into contact with each other.

  In view of the above problems, an object of the present invention is to provide a pump device that can easily adjust a gap between an impeller and a guide vane in a turbine pump.

  As the method, a gap adjusting member 50 shown in FIG. 6 is used. The clearance adjustment member 50 is cylindrical so that it can be attached to the outer diameter portion 12a of the impeller 12, and includes a clearance adjustment portion 50a and an operation portion 50b. The thickness t of the gap adjusting portion 50a is set to the same size as the gap L described above.

  A method of using the gap adjusting member 50 will be described below. The process is the same as described above until the impeller 12 is screwed onto the shaft 2a of the motor 2. Next, the gap adjusting portion 50 a is attached to the outer diameter portion 12 a of the impeller 12. This state is shown in FIG. Next, the guide vane 13 is inserted so as to cover the impeller 12 with the gap adjusting portion 50a attached. This state is shown in FIG. Next, the screw holes formed in the casing 11 and the holes of the guide vane 13 are aligned to fix the guide vane 13 to the casing 11. This state is shown in FIG. An enlarged cross-sectional view at this time is shown in FIG.

  From the state of FIG. 9 and FIG. 10, the operation part 50b of the gap adjusting member 50 is manually pulled out. This state is shown in FIG. Thereby, since the clearance L between the impeller 12 and the guide vane 13 is corrected by the thickness t of the clearance adjusting portion 50a, it can be easily and evenly adjusted. By using the gap adjusting member 50, the gap between the impeller and the guide vane can be adjusted without rotating the motor. Therefore, regardless of the type of motor such as an induction motor or a DC brushless motor, even a beginner in assembly and service can easily adjust the clearance between the impeller and the guide vane.

  The gap adjusting member 50 can be made of various materials such as metal. However, if it is made of synthetic resin, the cost can be reduced.

It is a longitudinal cross-sectional view of the pump apparatus which concerns on one Example of this invention. It is a right view of FIG. FIG. 3 is a plan view of FIG. 2 with a pump cover removed. It is the driving | running state figure which described from the driving | operation start to the stop in time series. It is an expanded sectional view of the pump part of FIG. It is sectional drawing of a clearance gap adjustment member. It is explanatory drawing which inserted the gap adjustment member in the impeller. It is explanatory drawing which inserted the guide vane in FIG. It is explanatory drawing which fixed the guide vane to the casing. It is an expanded sectional view of FIG. It is explanatory drawing showing the state which pulls out a clearance adjustment member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pressure tank, 2 ... Motor, 3 ... Control board, 4 ... Pump cover, 11 ... Casing, 12 ... Impeller, 13 ... Guide vane, 50 ... Gap adjustment member.

Claims (4)

A pump unit having an impeller rotated by a motor, positioned so as to cover the outer periphery of the impeller, and having a guide vane fixed to a casing forming an outer shell, and water pressurized by the pump unit In a pump device having a pressure tank for slaughtering water,
A pump device characterized in that a clearance adjustment member is attached to an outer diameter portion of a pumping inlet of the impeller, and the guide vane is fixed to the casing in a state where the clearance adjustment member is attached. In claim 1,
The said clearance gap adjustment member removes from the outer diameter part of the pumping inlet part of the said impeller after fixing the said guide vane to the said casing. In claim 1 or 2,
The pump device characterized in that the gap adjusting member is made of synthetic resin. In any one of Claims 1 thru | or 3,
A pump device characterized in that a motor for rotationally driving the impeller is constituted by a DC brushless motor.

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