JPS5965600A - Spiral pump device - Google Patents

Abstract

PURPOSE:To provide a compact pump as a whole by sequentially increasing the area of a guide water path toward a discharge water path to reduce the diameter of the pump. CONSTITUTION:While liquid lifted by an impeller 3 is discharged from the impeller, it is first discharged in the outer peripheral direction in a guide water path section constituted from a guide wall 20 of a housing 1 and a guide water path 17 of a bracket 2. Since the liquid discharged from the impeller 3 reduces speed and increases pressure while the guide water path 17 sequentially increases the area from the circumferential direction to the axial one toward a discharge water path, the liquid is continuously discharged into the discharge water path 18 to reduce the diameter of a pump and the size of the whole pump.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a volute pump device, and in particular, to a volute pump device suitable for compactly configuring a vortex pump related to a turbine pump without deteriorating its performance. This invention relates to a pump device.

[Prior art]

Conventionally, in turbine pumps with guide vanes, the head H relative to the diameter of the impeller is proportional to the square of the impeller diameter. In addition, a guide channel and a discharge channel for converting velocity energy into pressure energy are formed on the outer periphery of the impeller, and the guide channel has an outer diameter of 1.2 to 1.3 times the diameter of the impeller. It has a structure that surrounds the outside of the impeller, and a discharge waterway is provided on the outside of the impeller, and the maximum diameter of the pump part is 1.5 of the diameter of the impeller.
Since it is 1.8 times larger, the diameter of the pump part becomes larger than the diameter of the electric motor used as the drive source, which has the disadvantage that the pump as a whole becomes larger.

Despite this, the centrifugal pump is the most popular, even though it has the above-mentioned problems, because the maximum efficiency of the pump itself is as high as 60-90%.

Therefore, it is important to downsize the device without reducing its performance.

[Object of the Invention] The present invention enables the diameter of the pump section to be reduced without deteriorating the pump performance by improving the shape of the guide channel section, and also improves the suction capacity of the centrifugal pump. It is an object of the present invention to provide a centrifugal pump device which can also achieve the desired results.

[Summary of the invention]

The structure of the first invention of the centrifugal pump device according to the present invention is such that an impeller is attached to the frame-side end of the rotating shaft passing through the bracket via a shaft sealing device, and guide vanes are attached to the outer periphery of the impeller. In the centrifugal pump, the guide channel section is formed of the bracket and the frame and is continuously curved from the outer radial direction of the impeller in the axial direction. It is formed so that the area gradually increases toward the discharge waterway provided at the end.

In addition, the configuration of a second invention of a similar centrifugal pump device is such that an impeller is attached to the frame-side end of the rotating shaft passing through the bracket via a shaft sealing device, and guide vanes are attached to the outer periphery of the impeller. In the centrifugal pump, the guide channel section is formed of the bracket and the frame and is continuously curved from the outer circumferential radial direction of the impeller in the axial direction. The guide vane is formed so that its area increases sequentially toward the discharge waterway provided in the bracket, and the guide vane located at the uppermost end is formed with a communication path that communicates the discharge waterway with a priming port provided in the bracket. This is how it was done.

[Embodiments of the invention]

An embodiment of the centrifugal pump device according to the present invention will be explained with reference to FIG. 1-2.

Here, FIG. 1 is a sectional view of a main part of a centrifugal pump device according to an embodiment of the present invention, and FIG. 2 is a schematic sectional view taken along the line II in FIG. 1.

In the figure, 1 is the frame, 2 is the bracket, 3 is the impeller,
4 is a shaft sealing device, 5 is a rotating shaft, 6 is a fan, 7 is a fan guide, 8 is an electric motor, 9 is a bearing, 10 is a sleeve, 11
is the backing, 12 is the bolt, 13 is the plug, 1
4 is the backing.

Further, 15 is a suction port, 16 is a discharge port, 17 is a guide channel, 18 is a discharge channel, 19 is a blocking body, 20 is a guide wall, 21 is a guide vane, 22 is a communication path, 23 is a priming port, and P indicates the direction in which water flows.

Note that the one-dot chain line in FIG. 2 indicates the guide wall 20 in the frame 1.
This is a hypothetical view of the position viewed from the right side of FIG. 1.

Therefore, the structure according to this embodiment can be roughly divided into the structure related to the frame 1 and the structure related to the bracket 2, which are different from each other.

That is, first, the bearing 9 of the electric motor 8 provided as a drive source is
The rotating shaft 5 supported by the electric motor 8 is attached to the bracket 2 with a bolt or the like (not shown), with a j≧cleave 0 and a Huffian guide 7 to which a fan 6 for cleaning the electric motor 8 is fixed. 8 is fixed.

The impeller 3 is screwed onto the end of the rotating shaft 5 on the frame 1 side via a shaft sealing device 4 such as a mechanical seal.

Therefore, a priming port 23 communicating with the chamber of the impeller 3 is formed in the upper part of the bracket 2, and this priming port 23
A plug 13 is screwed onto the backing 14 in a watertight manner.

Furthermore, a guide vane 21 and a guide channel 17 are provided on the outer circumference of the impeller 3 of the bracket 2, and the guide channel 17 is continuously curved from the outer circumferential radial direction of the impeller 3 in the axial direction. As shown in FIG. 1, the impeller 3
The guide waterway portion is continuously formed in a curved shape from the outer circumferential radial direction to the axial direction.

Therefore, in the above-mentioned shape, this guide channel part is configured so that the fluid discharged from the impeller 3 decelerates and increases its pressure while changing its flow direction from the circumferential direction to the axial direction, that is, as shown in FIG. In this way, the area of the guide waterway 17 gradually increases toward the discharge waterway 18.

Further, a communication path 22 connected to the priming port 23 is formed at the upper part of the bracket 2, that is, at the uppermost end of the guide vane 21.

Next, the frame 1 is watertightly fixed to the bracket 2 with bolts 12 via the backing 11.

A guide wall 20 is formed on this frame 1, and a guide wall 20 is formed as one wall surface of the guide channel part that is constructed together with the bracket 20 and the guide channel 17, and a circle is provided on the discharge side of the guide channel 17 for the purpose of discharging the guide channel. An annular discharge waterway 18 is formed and provided, and this annular discharge waterway 18
The diameter of the guide waterway 17 is approximately the same as the diameter of the outlet end of the guide waterway 17. That is, the discharge channel 18 is provided at the outlet end of the guide channel section.

Further, the pumped liquid discharged from the guide channel portion of the guide channel 17 is transferred to the discharge channel 18 in the annular shape.
A blocking body 19 is formed near the upstream side of the discharge channel 18 to prevent the swirling flow occurring within the discharge channel 18.

Further, the frame body 1 is formed with a suction side so that the impeller 3 can rotate in a small gap between the frame body 1 and the base of the impeller 3, and accordingly, a discharge port 16 and a suction port 15 are formed.
It was also formed.

In addition to the configuration described above, first, a guide channel section is configured by the guide channel 17 and the guide wall 20, which are continuously formed in a curved shape from the outer circumferential radial direction of the impeller 3 to the axial direction. At the same time, by providing the discharge channel 18 in the frame body 1 at the outlet end of the guide channel section, the guide channel 18 is arranged so that the discharge is discharged in the radial direction of the outer circumference of the impeller, as in the conventional case. The diameter of the whole can be reduced by 1 compared to that of the parts,
The entire structure can be made compact.

That is, in the conventional type, the diameter of the pump part was larger than the diameter of the electric motor, but with the configuration of this embodiment, for example, when using the pump part, the diameter of the pump part is larger than the diameter of the electric motor. The diameter of the part can be made approximately the same as the diameter of the part, and the size can be reduced to a cylindrical shape, thereby eliminating dead space.

In addition, it has been confirmed through experimental results that there is no difference in liquid pumping performance from that of the conventional structure as described above.

That is, the liquid pumped up by the impeller 3 is discharged from the impeller 3, but the liquid is discharged from the impeller 3 through a guide channel section formed by the guide wall 20 of the frame body 1 and the guide channel 17 of the bracket 2. First, it is emitted towards the outer circumference, but as mentioned earlier,
As the fluid flows toward the outer periphery, the flow is decelerated and increased in pressure while changing the flow in the axial direction through the guide channel portion whose area increases successively, and the fluid is continuously discharged into the discharge channel 18.

Thereafter, the pumped liquid turns into a swirling flow within the annular discharge channel 18, and is then discharged from the discharge port 16 without any hindrance.

In addition, when the suction height is high, the gas contained in the pumped liquid is separated by the pressure drop in the suction port 15 and the impeller 3, and as described above, the gas is separated from the pumped liquid through the guide channel 17,
It is discharged from the guide channel section.

Then, when swirling in the discharge waterway 18 described above, the liquid with a heavy specific gravity separates to the outer peripheral side and the gas with a light specific gravity to the inner peripheral side,
In this case, by providing a blocking body 19 on the upstream side of the discharge channel 18 as in this embodiment, the liquid and gas can be blocked. After at least one turn after colliding with body 19, both
It is discharged from the discharge port 16.

Furthermore, even in the case where gas enters the rear surface of the impeller 3, which is often the case described above, the priming port 23 and the communication passage 22, which are opened at the top, have the following configuration. It can be discharged to the discharge side of the pump.

That is, when using the pump according to this embodiment, the plug 13 is removed and water is primed inside the impeller 30, but
If the communication path 22 as mentioned earlier is provided,
Air replacement through this communication path 22 and the communication path 2
Priming water can be applied from position 2 to the upper part of the discharge waterway 18, and liquid can be pumped smoothly at the time of startup.

Therefore, in the embodiment described above, by forming the annular discharge channel 18 and the blocking body 19 in the manner described above, stable performance can be obtained even at high suction heights. According to experiments, it was possible to increase the maximum dog suction height from 6 m to 8 to 9 m by installing the above-mentioned blocking body 19. This has a significant effect in practical use, as it stabilizes pumping performance.

In this regard, experiments have also shown that, at best, when the suction height of the conventional type reaches about 6 m, it becomes unstable due to surging and other effects, and eventually becomes unable to pump water. By forming the blocking body 19 and the like according to this embodiment, there is no problem such as inability to pump water even at a suction height of 9 m, and the system can be put to practical use.

Of course, when the suction height is not high, the operation can be carried out without any practical problem even if this blocking body is not installed.

In addition, when providing the communication path 22 mentioned above, the above-mentioned effects can be expected, but this does not necessarily mean that it must be provided, and it depends on the usage mode and configuration. However, if the suction height is low or if the structure makes it difficult for gas to accumulate, this may not be provided.

〔Effect of the invention〕

According to the present invention, the outer diameter of the pump portion can be reduced without deteriorating the pump performance, and the entire pump can be downsized, so it can be said that the invention has excellent practical effects.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a centrifugal pump device according to an embodiment of the present invention, and FIG. 2 is a schematic sectional view taken along line II in FIG. 1. l... Frame, 2... Bracket, 3... Impeller,
4... Shaft sealing device, 5... Rotating shaft, 8... Electric motor,
13... Plug, 15... Suction port, 16... Discharge port, 17... Guide waterway, 18... Discharge waterway, 19.
...Block body, 2o...Guide wall, 21...Guide vane,
22...Communication path, 23...priming port. Agent: Patent attorney Kosaku Fukuda. (1 other person) ゛ ・- 1st dream 2 diagram

Claims (1)

[Claims] 1. An impeller is attached to the frame side end of a rotating shaft passing through a bracket via a shaft sealing device, and a guide vane is arranged around the outer periphery of the impeller. In the pump, the guide waterway section is formed of the bracket and the frame body and is continuously curved from the outer circumferential radial direction of the impeller in the axial direction, and the discharge waterway provided at the outlet end thereof. A centrifugal pump device characterized in that it is formed so that its area gradually increases toward the direction of the direction. 2. A centrifugal pump device according to claim 1, wherein a blocking body is provided near the upstream side of the discharge waterway. 3. In a centrifugal pump in which an impeller is attached to the frame side end of the rotating shaft passing through the bracket via a shaft sealing device, and a guide vane is arranged around the outer periphery of the impeller, the above-mentioned bracket and The guide channel part is formed in a continuous curved shape from the outer circumferential radial direction of the impeller to the axial direction, and the area gradually increases toward the discharge channel provided at the outlet end. 1. A centrifugal pump device, characterized in that the guide vane located at the uppermost end is formed with a communication path that communicates the discharge waterway with a priming port provided on the bracket. 4. The centrifugal pump device according to claim 3, wherein a blocking body is provided near the upstream side of the discharge waterway.