JPS6332195A - Combination pump - Google Patents

Abstract

PURPOSE:To enable switchover to an optional water pressure and an optional water quantity by directly connecting a Wesco pump and a centrifugal pump to a normal/reverse rotation motor and independently providing suction ports and discharge ports respectively. CONSTITUTION:A normally and reversely rotatable motor 1 is set so that its velocity control can be optionally carried out, and a centrifugal pump 2 and a Wesco pump 3 are provided on it. A suction port 5 and a discharge port 6 are provided on the centrifugal pump 2 and, equally, a suction port and a discharge port are independently provided on the Wesco pump 3. By controlling the velocity, and switching over the rotating direction, of the motor 1, a desired characteristic can be obtained from both pumps 2, 3, enabling the optional switchover of a water pressure and a water quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a compound pump suitable for equipment that requires various water pressures and amounts of water.

"Conventional technology" Equipment that uses water for cleaning and other tasks, such as dishwashers, requires various types of water pressure and water flow, such as high-pressure jetting and low-pressure large-volume water flow. Ru.

Pump devices used for such purposes are configured to change the water pressure and water volume by controlling the rotation speed of the electric motor, but simply changing the rotation speed of the electric motor can affect the pump characteristics. Since it is proportional to the rotation speed of the electric motor, it is not suitable for the purpose.

In other words, in both Wesco pumps and centrifugal pumps, the water volume and discharge pressure change in proportion to the rotation speed, so if you control only the rotation speed of the motor, which is easy to control, you will not be able to control characteristics such as low pressure large water flow or high pressure small water flow. Because 1q of water could not be pumped, the amount of water had to be adjusted by combining the pump with a complicated bypass circuit.

However, forming a bypass circuit to adjust the amount of water is cumbersome to operate and is not practical.

In particular, if you try to control electrically in combination with equipment, you will need electrical parts to control the valves that form the bypass in an on-board manner, and in order to control water volume etc. in an analog way, it is difficult to Complications were inevitable.

"Problems to be Solved by the Invention" The present invention was made in view of these circumstances.
The objective is to provide a compound pump that has a simple structure and is suitable for devices that require various water volumes and pressures, such as dishwashers.

"Means for Solving the Problems" The present invention configures an electric motor to be capable of forward and reverse rotation, directly connects a Wesco pump and a centrifugal pump to this electric motor, and independently connects a suction port and a discharge port to δΩ. The problem has been solved by taking the following steps.

"Operation" By reversing the electric motor, the Wesco pump
The direction of water absorption is reversed, making it possible to switch from water absorption to drainage.

At this time, the characteristics of the centrifugal pump, such as the amount of water, can be arbitrarily set depending on the shape of the centrifugal impeller.

Therefore, it is possible to adjust the amount of water discharged in the centrifugal pump and to switch from water suction to drainage in the Wesco pump.

``Example'' This invention is based on an example shown in the drawings. To be clear, FIG. 1 is a longitudinal sectional view of a compound pump according to an embodiment of the present invention, and FIG. 2 is a front view thereof.

In FIG. 1, the compound pump includes an electric motor 1, a centrifugal pump 2, and a Wesco pump 3.

The electric motor 1 is configured so that forward and reverse rotation can be performed as desired, and speed control can be performed as desired.

Furthermore, the centrifugal pump 2 is provided to be directly connected to the shaft 4 of the electric motor 1, and the suction port 5 is in the front in the axial direction, and
A discharge port 6 is provided at the upper portion in the radial direction.

Further, a spiral impeller 7 is provided at the end of the shaft 4, and a nut 8
Fixed by

The Wesco pump 3 includes a Wesco impeller 9 on a shaft 4, and is fixed to the shaft 4 together with a spiral impeller 7 by a nut 8.

A partition plate 1 is provided between the spiral impeller 7 and the Wesco impeller 9.
This partition plate 10 has a gap 11 formed in the portion through which the shaft 4 passes, and the centrifugal pump 2 and the Wesco pump 13 are communicated through this slight gap 11.

The centrifugal pump 2 and the Wesco pump 3 are axially stacked in a sandwich-like manner and are directly connected to the electric motor 1 , and the shaft 4 of the electric motor 1 is sealed inside the Wesco pump 3 by a shaft seal member 12 .

The spiral impeller 7 and the Wesco impeller 9 are passed through a shaft 4 having a cross-sectional shape, and are fixed to the shaft 4 in the rotational direction, and a stepped portion 15 is formed. The nut 8 is configured to sandwich the wheel 9 with the nut 8.

In FIG. 2, a centrifugal pump 2 is provided on the front, and a Wesco pump 3 is provided on the back of the centrifugal pump 2 (iiti
is being given.

Then, the suction port 13 and the discharge port 1 of the Wesco pump 3
4 protrudes to the side, and is configured so that a hose or the like (not shown) can be connected thereto.

In such a configuration, the compound pump includes the centrifugal pump 2
When the electric motor 1 is rotated in one direction with water injected into the pump, the centrifugal pump 2 and the Wesco pump 3 are simultaneously driven, and the centrifugal impeller 7 generates negative pressure at the suction port 5 and can absorb water.

Due to the nature of the centrifugal impeller 7, the centrifugal pump 2 can form a large water mother type pump with a large water volume of 1 q, but the discharge pressure does not become very high.

Roughly speaking, the Wesco pump 3 has a small gap 1 formed between the partition plate 10 and the shaft 4 due to the operation of the centrifugal pump 2.
1, and the action of the Wesco impeller 9 occurs.

The action of this Wesco impeller 9 is that even if there is air in the suction port 13 of the Wesco pump 3, the air in the suction port 13 can be gradually discharged to the discharge port 14 by water that enters through the gap 11, resulting in a self-priming effect. will be presented.

For this reason, the Wesco pump 3 can pump water even if there is air in the suction port 13, and when pumping water, high-pressure water is pumped into the discharge port 14 as a high-pressure pump due to its nature.

Of course, this self-priming effect is not necessary if the Wesco pump 3 is always filled with water, and is not necessarily required.
[isn't it.

Therefore, in the compound pump operated in this way, low pressure water is supplied by the centrifugal pump 2, and from the 1st Quesco pump 3,
This means that a high pressure rate water source can be obtained, which can be used as needed.

Furthermore, when the rotational direction of the electric motor 1 is switched to the other direction, the centrifugal pump 2 is operated without significant performance deterioration due to the nature of the centrifugal impeller 7.

At this time, since the characteristics of the volute pump 2 are determined by the type of the volute impeller 7, they can be arbitrarily set by selectively using various types of the volute impeller 7.

In other words, by utilizing the fact that the efficiency changes depending on the direction of rotation of the blades of the spiral impeller 7, the characteristics can be arbitrarily selected depending on the direction of rotation.

For example, if the blades are provided in a radially straight shape in the radial direction, the water pumping characteristics can be improved by 1q regardless of the rotation direction.

Furthermore, if the blades can be tilted to one side, the water pumping characteristics will change depending on the direction of rotation, and the characteristics can be switched by changing the direction of rotation.

On the other hand, when the rotation direction of the Wesco pump 3 is changed, the actions of the suction port 13 and the discharge port 14 are reversed by the Wesco impeller 9, and negative pressure is generated at the discharge port 14, which allows water to be sucked. It will be discharged from the suction port 13.

Utilizing this property, it is possible to arbitrarily absorb and drain water into a container such as a dishwashing hall using a single pump.

Therefore, the action of the pump can be conveniently switched by forward and reverse rotation of the electric motor 1, that is, by electrical control.

The electric motor 1 is generally electrically controlled in a single/direction manner, and can be controlled in forward and reverse directions, as well as in % speed control or simple 1i control.
By combining speed control, the pumping characteristics can be further varied.

In such a compound pump, by controlling the speed of the electric motor 1, it is possible to adjust the pressure and the amount of water, and by using it together with the above-mentioned switching of the rotation direction, arbitrary characteristics can be obtained from the centrifugal pump 2 and the Wesco pump 3. become.

Such a compound pump can easily switch from water injection to drainage by forwarding and reversing the Wesco pump 3, for example, when switching processes in several automatically operated ranges.Moreover, by controlling the speed, the amount of water required can be reduced. It is convenient to be able to control the water pressure, and it does not require spraying water to adjust the water pressure, which improves operational efficiency.

In addition, when such a compound pump is installed integrally on the shaft 4 of the 3 electric motors 1, by providing the Wesco pump 3 on the electric motor 1] 1i11 side and the centrifugal pump 2 on the end side of the shaft 4,
The suction port 5 of the centrifugal pump 2 formed in the axial direction is
[It is convenient because it can be easily formed without having to do it.]

However, the separation between the centrifugal pump 2 and the Wesco pump 3 is separated by 1'! ? It can be simply partitioned, and by forming a gap between the partition plate 10 and the shaft 4, a self-priming function can be formed.

"Effects of the Invention" According to the present invention, it is convenient for use in dishes such as dishwashers that require various water pressures and drains, and in which it is desired to switch the water pressure and water amount arbitrarily. It is possible to make a simple compound pump of 1 q, which not only improves the operability of the device, but also makes it compact and lightweight, which improves manufacturing convenience, and its utility value is extremely large.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a compound pump according to an embodiment of the present invention, and FIG. 2 is a front view thereof. DESCRIPTION OF SYMBOLS 1... Electric motor, 2... Volute pump, 3... Wesco pump, 7... Spiral impeller, 9... Wesco impeller, 10... Partition plate, 11... Gap.

Claims (1)

[Claims] A compound pump characterized in that an electric motor is configured to be capable of forward and reverse rotation, a Wesco pump and a centrifugal pump are directly connected to the electric motor, and each pump is independently provided with a water intake port and a discharge port.