JPH06323288A - Self-priming type volute pump - Google Patents

Abstract

PURPOSE:To start pumping-up of liquid in a short time even if a suction head is high and the volume of gas to be self-primed is large. CONSTITUTION:In a self-priming type volute pump having an impeller 10 having small vanes 11 on the outer peripheral part, an impeller receiving disk-like space in which the impeller 10 is rotatably received, a suction port 4, a discharge port 5 and a casing 1 having an annular working path 3 provided opposedly to the small vanes 11 on the outer edge of the impeller receiving space and having one end communicating with the suction port 4 and the other end communicating with the discharge port 5, the casing 1 has the center part of the impeller receiving space communicating with the proximity of an inlet part 31 of the working path 3.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to improvements in self-priming vortex pumps. In particular, the present invention relates to an improvement that allows the liquid to be pumped up in a short time even if the suction height is high and the amount of gas to be self-primed is large.

[0002]

2. Description of the Related Art When pumping a liquid using a pump, when the liquid is pumped up, if the inside of the pump is not filled with the liquid, the pump only idles and the liquid below cannot be pumped up. . For this reason,
When starting a normal pump, the priming process is essential. As a conventional vortex flow pump, a self-priming pump having a self-priming system having a structure as shown in FIG. 3 is known in place of the normal priming system (Japanese Patent Publication No. 57-57).
No. 23798).

FIG. 5 and FIG. 6 are sectional views of a self-priming vortex pump according to the prior art taken in a direction orthogonal to the rotation axis, and FIG. 6 is a YY sectional view thereof. In FIG. 5, reference numeral 18 is a self-priming vortex pump according to the related art. Reference numeral 1 is a casing, and 2 is an impeller housing space provided in the casing 1 (see FIG. 6). An impeller 10 having small blades 11 is housed in the impeller housing space 2 so as to be freely rotatable.
The impeller 1 at the outer edge of the impeller housing space 2 of the casing 1
The working passage 3 is provided in the portion of the working passage 3 which is in contact with the small blade 11, and the suction port 4 is provided at one end of the working passage 3 and the discharge portion 19 is provided at the other end. The discharge part 19 and the suction port 4 are separated by a partition wall 6 so that the fluid discharged from the discharge part 19 does not return to the suction port 4. Reference numeral 20 denotes a self-priming liquid tank having a cylindrical inner wall, and the fluid (mixed fluid of liquid and gas) discharged from the discharge unit 19 is provided so as to enter the tangential direction of the self-priming liquid tank 20. . 21 is a pump discharge port provided in the self-priming liquid tank 20.

A self-priming vortex flow pump 1 constructed in this way
For example, when water at the bottom of the well is sucked up by using 8, the suction port 4 and the water at the bottom of the well are connected by a pipe (not shown). Then, as shown in the figure, when the casing 1 is filled with the liquid in advance, and then the shaft 12 is rotated to drive the impeller 10, the suction between the suction port 4 and the water surface at the bottom of the well is detected. The air in the pipe is agitated with the liquid previously supplied into the casing 1 in the working passage 3, and is discharged from the discharge unit 19 to the self-priming liquid tank 20 as a mixed fluid of the liquid and the air. In the cylindrical self-priming liquid tank 20, the liquid is stored in the self-priming liquid tank 20 after rotating once along the cylindrical wall, and most of the air is separated from the liquid and the liquid of the cylindrical self-priming liquid tank 20 is stored. Collected at the center and discharged from the pump discharge port 21. A part of the liquid stored in the self-priming liquid tank 20 is contained in the large number of grooves formed between the small blades 11 and returns to the suction port 4, and a part of the liquid is stored in the casing 1 and the impeller 10. To the suction port 4 side of the working passage 3 through a gap (a region that is not occupied by the impeller 10 in a partial region of the impeller housing space 2), particularly in the vicinity of the rotation axis (hereinafter referred to as the central portion) 8. Since it recirculates, the working passage 3 is filled with the circulating liquid, the pump action is performed without idling of the pump, and the air between the suction port 4 and the water surface at the bottom of the well is sucked in. to continue. In the meantime, the water level in the pipe rises, and the water is sucked in and pumped up.

[0005]

By the way, in the self-priming vortex pump according to this prior art, the ultimate vacuum degree of the suction port of the self-priming vortex pump is sufficiently higher than the depth to the water surface of the well. , Between the suction port and the water surface at the bottom of the well, even if it has the ability to suck water against the vacuum level of the suction port when the water level in the pipe rises to the suction port of the self-priming vortex pump When there is a lot of air, it may not be possible to pump water.

Further, gas is mixed with the liquid from the discharge part 19 and enters the central part 8. The liquid collects on the outer peripheral portion of the central space 8 due to the difference in centrifugal force with the gas, and the gas collects on the center of the central space 8. Furthermore, when the amount of air in the central space 8 gradually increases, the central space 8 is filled with air. Originally, the pressure in the central space 8 is an intermediate pressure between the suction pressure and the discharge pressure. Therefore, when the central space 8 is filled with gas, a large amount of air immediately returns to the suction port having a low pressure. That is, a large amount of air suddenly fills the inlet portion of the working passage 3. When that happens,
Air will spread over the entire working passage 3. And, the liquid required for the pump action is insufficient, it becomes a state of idling, self-priming becomes impossible, self-priming time is long,
In addition, the ultimate vacuum may be deteriorated or the self-priming may become impossible.

An object of the present invention is to eliminate these drawbacks. The amount of gas above the liquid to be pumped up, that is, the suction height is large even if the volume of gas to be self-sucked is large. It is to provide a high-performance self-priming vortex pump capable of pumping liquid even if it exists.

[0008]

The above object can be achieved by any of the following means.

The first means is an impeller (10) having small blades (11) on its outer periphery, and a disk-shaped impeller accommodating space in which the impeller (10) is rotatably accommodated. 2)
A suction port (4), a discharge port (5), and an outer edge portion of the impeller housing space (2) provided in contact with the small blade (11),
A casing (1) having an annular working passage (3) having one end communicating with the suction port (4) and the other end communicating with the discharge port (5).
In a self-priming vortex flow pump having: a casing (1), a gas discharge port (7) provided in the vicinity of the inlet portion (31) of the working passage (3), and a gas discharge port (7). A self-priming vortex pump provided with a gas conduit (15) communicating with a gas inlet (9) provided in the central portion (8) of the impeller housing space (2).

The second means is an impeller (10) having small blades (11) on the outer periphery, and a disk-shaped impeller accommodating space (in which the impeller (10) is rotatably accommodated therein. 2)
A suction port (4), a discharge port (5), and an outer edge portion of the impeller housing space (2) provided in contact with the small blade (11),
A casing (1) having an annular working passage (3) having one end communicating with the suction port (4) and the other end communicating with the discharge port (5).
In the self-priming vortex flow pump having: a gas that communicates the casing (1) with the central portion (8) of the impeller housing space (2) and the vicinity of the inlet portion (31) of the working passage (3). It is a self-priming vortex flow pump in which a conduction path (16) is formed.

[0011]

In the self-priming vortex pump according to the related art, the self-priming liquid tank 20 stores the self-priming liquid vortex pump, and the gap between the casing 1 and the impeller 10 (the impeller 10 is occupied in a part of the impeller housing space 2). Area) especially the working passage 3 via its central part 8
Although the fluid that circulates to the suction port 4 side is a mixed fluid of liquid and gas, even though the gas is separated in the self-priming liquid tank 20, the centrifugal action due to the rotation of the impeller 10 in the central portion 8 When working, liquids containing gas are centrifuged,
The gas collects in the central part 8. When the amount of air to be sucked by itself, that is, the amount of air in the pipe is large, while the air is sucked from the suction port 4 and discharged from the discharge portion 19, the central portion 8
The amount of the gas accumulated in is gradually increased, and when it finally reaches the operation passage 3, the discharge part 19 and the suction port 4 are short-circuited with air, and the self-priming vortex flow pump idles and the pump action does not work.

However, in the self-priming vortex pump according to the present invention, as described above, the gas suction port 9 communicating with the central portion 8 is provided.
Is configured to be electrically connected to the gas discharge port 7 provided at the inlet 31 of the working passage 3, so that the gas collected in the central part 8 is operated from the gas suction port 9 via the gas discharge port 7. Since it is sucked up by the inlet portion 31 of the passage 3, the amount of gas accumulated in the central portion 8 does not increase. For this reason, the working passage 3 is always filled with the liquid, and the self-priming vortex pump continues to suck the gas without idling. Therefore, the amount of air to be self-priming, that is, the water in the well and the present invention are related. The self-priming time can be shortened even if the amount of air in the pipe connecting the self-priming vortex pump is large. Further, the liquid can be pumped up even if the suction height is high.

The central part 8 of the impeller housing space 2 and the inlet part 31 of the working passage 3 are replaced with the conduit 15 which connects the central part 8 of the impeller housing space 2 and the vicinity of the inlet part 31 of the working passage 3 to each other. A conductive path 16 may be formed in the casing 1 so as to be electrically connected to the vicinity.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The self-priming vortex pumps according to two embodiments of the present invention will be described in more detail below with reference to the drawings.

First Embodiment See FIGS. 1 and 2 FIGS. 1 and 2 are sectional views showing the structure of a self-priming vortex flow pump according to a first embodiment of the present invention. FIG. 1 is a cross-sectional view of the self-priming vortex pump taken in a direction orthogonal to the rotation axis, and FIG. 2 is a XX cross-sectional view of FIG. In the figure, reference numeral 1 denotes a casing, which is composed of a casing body, a casing cover, an O-ring and the like (not shown). Reference numeral 2 denotes an impeller accommodating space formed of a disk-shaped cavity (to be exact, a region of the disk-shaped cavity that faces the side surface of the impeller 10 excluding the small blades 11) provided in the casing 1. The impeller 10 is rotatably accommodated therein. The impeller 10 has small blades 11 along the outer circumference thereof. 12 is an impeller 1
It is a drive shaft that rotatably supports 0. A is impeller 10
Indicates the rotation direction of. A seal member 13 is provided between a bearing portion that rotatably supports the drive shaft 12 and the impeller center portion 8.

Reference numeral 3 denotes an operating passage, which is provided in a portion of the outer edge portion of the impeller housing space 2 that is in contact with the small blade 11 of the impeller 10. One end of the working passage 3 communicates with the suction port 4,
The other end communicates with the discharge port 5. The discharge port 5 and the suction port 4 are separated by a partition wall 6 so that the fluid discharged from the discharge port 5 does not return to the suction port 4. 31 is the inlet of the working passage 3, and 7 is the inlet 3.
1 is a gas discharge port provided in the casing 1 so as to communicate with 1. Reference numeral 8 is a central portion of the impeller housing space 2, and 9 is a gas suction port provided in the casing 1 so as to communicate with the central portion 8 (see FIG. 2). The gas suction port 9 and the gas discharge port 7 are connected by a conduit 15 so as to be electrically connected to each other.

In the self-priming vortex pump according to the present invention, the casing 1 is filled with the liquid as shown in the figure, and when the impeller 10 is driven, the air sucked from the suction port 4 is changed to the working passage 3 After being agitated with the liquid inside, it is discharged to the outside from the discharge port 5 as a mixed fluid of the liquid and air. The mixed fluid of liquid and air temporarily collects near the discharge port 5, but passes through the central portion 8 and the working passage 3
To the suction inlet 4 side. The centrifugal force generated by the rotation of the impeller 10 acts on the central portion 8, and the gas contained in the liquid is centrifugally separated and collected in the center of the central portion 8. However, the gas suction port 9 communicating with the central portion 8 is electrically connected to the gas discharge port 7 provided at the inlet 31 of the working passage 3, and the gas collected in the central portion 8 is discharged from the gas suction port 9. Since it is sucked into the entrance 31 via the exit 7,
The working passage 3 is filled with the liquid, and the self-priming vortex pump continues to operate even if the amount of air to be self-priming is large.
It should be noted that the impeller 10 is provided with several openings 14 so that the air accumulated in the central portions 8 on both sides thereof is sucked from the gas suction port 9 and sent to the gas discharge port 7 via the conduit 15. ing.

Second Embodiment See FIGS. 3 and 4 FIGS. 3 and 4 are sectional views showing the structure of a self-priming vortex flow pump according to a second embodiment of the present invention. 3 is a cross-sectional view of the self-priming vortex flow pump taken in a direction orthogonal to the rotation axis, and FIG. 4 is a ZZ cross-sectional view of FIG. The difference from the first embodiment is that in the first embodiment, the central portion 8 of the impeller housing space 2 and the vicinity of the inlet 31 of the working passage 3 are electrically connected by a conduit 15 attached to the outside. In the second embodiment, the conduction path 16 for conducting the central portion 8 of the impeller housing space 2 and the vicinity of the inlet portion 31 of the working passage 3 is formed as shown in FIGS.
As shown in FIG. 3, it is only provided in the casing 1. It is not always necessary that one opening of the communication path 16 is near the inlet 31 of the working path 3,
The self-priming efficiency is best in the vicinity of the inlet 31 of the working passage 3.

[0019]

As described above, in the self-priming vortex flow pump according to the present invention, the gas suction port provided at the center of the impeller housing space is the gas discharge port provided at the inlet of the working passage. The gas (air) that has been centrifugally separated and collected in the center of the impeller housing space is sucked from the gas suction port to the gas discharge port. If a liquid is supplied, the liquid is agitated with the gas sucked from the suction port in the working passage, and is discharged from the discharge port as a mixed fluid of the gas and the liquid. Enter and centrifuge at the center by rotating the impeller,
Only the gas component tends to be stored in the center of the central portion, but this gas component is stored and is sucked from the gas suction port to the gas discharge port. Therefore, the amount of gas accumulated in the center of the impeller housing space does not increase, and the working passage is always filled with the amount of liquid necessary for self-priming. Even if the self-priming vortex flow pump is large, the self-priming vortex pump operates without idling, and even if the self-priming height is high, it is possible to start pumping the liquid in a short time.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure of a self-priming vortex flow pump according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the structure of the self-priming vortex flow pump according to the first embodiment of the present invention, which is a cross-sectional view taken along line XX of FIG.

FIG. 3 is a sectional view of a self-priming vortex pump according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of a self-priming vortex flow pump according to a second embodiment of the present invention, which is a ZZ cross-sectional view of FIG.

FIG. 5 is a sectional view showing a structure of a self-priming vortex flow pump according to a conventional technique.

6 is a sectional view taken along line YY of FIG. 5, showing the structure of a self-priming vortex flow pump according to the prior art.

[Explanation of symbols]

 1 casing 2 impeller accommodation space 3 working passage 4 suction port 5 discharge port 6 partition wall 7 gas discharge port 8 central part of impeller accommodation space 9 gas suction port 10 impeller 11 small blade 12 drive shaft 13 seal member 14 for impeller Provided opening 15 Conduit 16 Conducting path 18 Self-priming vortex pump 19 according to the prior art 19 Discharge part 20 Self-priming liquid tank 21 Pump discharge port 31 Inlet part

Claims (2)

[Claims] 1. An impeller (10) having small blades (11) on its outer periphery, and a disk-shaped impeller accommodating space (2) in which the impeller (10) is rotatably accommodated. A suction port (4), a discharge port (5), and an outer edge portion of the impeller housing space (2) provided in contact with the small blade (11), one end of which communicates with the suction port (4). A self-priming swirl pump having a casing (1) having an annular working passage (3) having the other end communicating with the discharge port (5), wherein the casing (1) has the working passage (3). ), A gas discharge port (7) provided near the inlet part (31), and a gas suction port (9) provided in the gas discharge port (7) and the central part (8) of the impeller housing space (2). ) And a gas conduit (15) communicating with the self-priming vortex pump. 2. An impeller (10) having small blades (11) on its outer periphery, and a disk-shaped impeller accommodating space (2) in which the impeller (10) is rotatably accommodated. A suction port (4), a discharge port (5), and an outer edge portion of the impeller housing space (2) provided in contact with the small blade (11), one end of which communicates with the suction port (4). A self-priming vortex pump having a casing (1) having an annular working passage (3) having the other end communicating with the discharge port (5), wherein the casing (1) includes the impeller accommodation space. (2)
Central part (8) and the inlet part (31) of the working passage (3)
A self-priming vortex pump, characterized in that a gas communication path (16) communicating with the vicinity is provided.