JP2001165083A - Rotary pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent a fluid from leaking to the outside while facilitating a manufacturing work. SOLUTION: A tubular casing part 21' is extended to a pump bracket 20' having an electric motor 1 installed thereon so as to form them integrally with each other, and impellers 10A, 10B, and 10C are held on an output shaft 2 of an electric motor 1 inside the casing part 21'.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary pump in which an impeller is rotated by driving a driving source provided on a pump bracket.

[0002]

2. Description of the Related Art FIGS. 12 and 13 show a prior art of this kind of rotary pump, in which an electric motor A drives impellers B1, B2 and B3 to rotate the impellers B1, B2 and B3. Fig. 2 shows a water supply pump configured to pump water by rotation.

An electric motor A, which is a driving source, is provided on the basis of a pump bracket C made of casting, and three impellers B1, B2, and 3 are provided at a tip end of an output shaft D extending through the pump bracket C. Holds B3. Impeller B1
, B2, B3 are suction ports Ba1, Ba2, B at the center.
This is a centrifugal impeller that discharges water sucked from a3 in the radial direction.

[0004] These impellers B1, B2, B3 are provided with separate casings F1, F2, F interposed between the above-mentioned pump bracket C and the suction bracket E made of casting.
3 housed. The casings F1, F2, F3 are respectively composed of tubular portions Fa1, Fa2, Fa3 and partition portions Fb1,
It has Fb2 and Fb3 and is integrally formed of metal such as stainless steel. Tubular parts Fa1, Fa2, Fa
Reference numeral 3 denotes a cylindrical portion that covers the outer peripheral portions of the impellers B1, B2, and B3. Partition parts Fb1, Fb2, F
b3 is a disc-shaped portion provided so as to cover the tips of the impellers B1, B2, B3 from the tips of the tubular portions Fa1, Fa2, Fa3, and to allow the output shaft D to penetrate the center of each. It has penetrating portions Fc1, Fc2, Fc3.

[0005] Mouth rings G1, G2, G3 are provided on the inner end surfaces of the partition walls Fb1, Fb2, Fb3. The mouth rings G1, G2, G3 are ring-shaped flat members formed of a resin such as Teflon (trade name: polyfluorinated ethylene fiber).
The partition walls Fb1, Fb2, Fb3 are held by H2, H3 and mouth ring covers J1, J2, J3. These mouth rings G1, G2, G3
1, B2, B3, suction ports Ba1, Ba2, Ba3
Is arranged so as to surround the outer periphery of the impeller B.
It has the function of supporting the rotation of 1, B2 and B3.

Further, the casings F2 and F3 disposed on the base end side of the output shaft D are provided with guide vanes K1 and K2 on the outer surfaces of the partition walls Fb2 and Fb3, respectively. Guide vane K
1 and K2 are impellers B1 and B1,
This is a portion which constitutes a passage for guiding water discharged from B2 to suction ports Ba2, Ba3 of the next impellers B2, B3, and is provided between partition walls Fb2, Fb3 and guide blade support plates M1, M2. It is.

In the rotary pump constructed as described above, the pump working chambers N1, N2, N3 for the respective impellers B1, B2, B3 are provided inside the casings F1, F2, F3.
N3 will be defined. Each pump working chamber N1, N2
, N3 are guide vanes K1, K2 arranged between them.
Are in communication with each other.

Now, when the electric motor A is driven in the rotary pump, impellers B1, B2,
B2 and B3 rotate respectively, and first, the suction bracket E
The water is sucked into the impeller B1 on the distal end side through the water suction port L. The water sucked into impeller B1 is
After being discharged in the radial direction, it is sucked into the next impeller B2 through the pump working chamber N1 and the guide blade K1.
The water sucked into the next impeller B2 is discharged again in the radial direction, and then the pump working chamber N2 and the guide blade K2
After that, it is sucked into the next impeller B3, finally discharged into the pump working chamber N3, and then pressure-fed to a desired height position.

[0009]

By the way, in the rotary pump described above, the joint between the pump bracket C and the casing F3, the mutual joint between the casings F1, F2 and F3, and the casing F1 and the suction bracket E are connected to each other. Have a structure in which the joints are exposed to the outside. That is, the joints of the pump working chambers N1, N2, N3 are all exposed to the outside. Therefore, in order to prevent water from leaking to the outside, the space between the pump bracket C and the casing F3, the space between the casings F1, F2 and F3,
In addition, a strict sealing process must be applied to each of the space between the casing F1 and the suction bracket E, which complicates the operation of manufacturing the rotary pump. Moreover,
Since this sealing process increases in accordance with the number of casings, when the number of impellers is increased to increase the head, the manufacturing operation becomes more complicated.

Further, when an external impact is applied, the pump bracket C and the casings F1, F2, F3
There is a possibility that the relative displacement of the suction bracket E and the suction bracket E or the deformation of the casings F1, F2, F3 may occur. In such a case, even after the strict sealing process, it is difficult to prevent the leakage of water.

In view of the above circumstances, it is an object of the present invention to provide a rotary pump capable of effectively preventing leakage of fluid to the outside while facilitating a manufacturing operation.

[0012]

According to the present invention, there is provided a rotary pump in which an impeller is rotated by driving a driving source provided on a pump bracket, wherein the pump bracket is extended in a cylindrical shape, and the impeller is provided therein. Is to be accommodated.

According to the present invention, there is provided a rotary pump in which an impeller disposed between the pump bracket and the suction bracket is rotated by driving a drive source provided on the pump bracket. Are connected to each other by extending at least one of them into a cylindrical shape, and the impeller is accommodated in a portion extending in the cylindrical shape.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments. 1 to 3 show a first embodiment of a rotary pump according to the present invention. The rotary pump exemplified here rotates the three impellers 10A, 10B, and 10C using the electric motor 1 as a drive source, and rotates the impellers 10A, 10B, and 10C in the same manner as the rotary pump shown in FIG. This is a water supply pump that pumps water.

The electric motor 1 is provided on the basis of a pump bracket 20 made of casting, and three impellers 1 are provided at the tip of an output shaft 2 extending through the pump bracket 20.
0A, 10B, and 10C are held. Impeller 10
A, 10B, and 10C are suction ports 11 at the center, respectively.
A, 11B, and 11C are centrifugal impellers for discharging water drawn in from the radial direction, and each boss 12
The intermediate collars 30, 31 are interposed between A, 12B, and 12C, and are attached to the output shaft 2 in a state where an appropriate interval is secured therebetween. Hereinafter, the three impellers 10A, 10B, and 10C will be referred to as a first impeller 10A, a second impeller 10B, and a third impeller 10C in order from the tip end side of the output shaft 2 as needed.

These impellers 10A, 10B, 10C
The outer peripheral portions are covered by a casing 21. The casing portion 21 is a portion integrally formed in a tubular shape from the pump bracket 20 described above, and has three cylindrical portions 21a, 21b, 21c having different inner diameters from each other, and also has the respective cylindrical portions 21a, 21b, 21c. 21
c at two positions between each other.
b. Three cylindrical portions 21a, 21b, 2
1c, impellers 10A, 10B, 1 each have a cross section.
It is a part that forms a circle that is sufficiently larger than the outer diameter of 0C,
The casing 21 is provided in the order of decreasing inner diameter from the opening side to the base end side. Fitting grooves 22a, 22b
Each has an inclined inner peripheral surface whose inner diameter gradually increases toward the opening of the casing portion 21. The outer peripheral portions of the intermediate collars 30, 31 interposed between the impellers 10A, 10B, 10C and It is provided at a position.
The fitting groove 22a provided on the opening side of the casing portion 21 has a minimum inner diameter substantially matching the maximum inner diameter of the fitting groove 22b provided on the base end side in consideration of the workability of mounting the partition plate described later. It is formed in. Hereinafter, the two fitting grooves 22a and 22b will be referred to as a first fitting groove 22a and a second fitting groove 22b, respectively, from the opening side of the casing 21 as needed, and each will be described.

The partition plates 40 and 41 are attached to the fitting grooves 22a and 22b, respectively. Each of the partition plates 40 and 41 has a disk shape that matches the minimum inner diameter of each of the fitting grooves 22a and 22b. The partition plates 40 and 41 have inner peripheral walls 40a and 41a at their respective central portions, and have respective outer edges. Have outer peripheral wall portions 40b and 41b. The inner peripheral wall portions 40a, 41a are provided so as to surround the through holes 40c, 41c formed in the central portions of the partition plates 40, 41, and protrude from the partition plates 40, 41 toward one side. . The outer peripheral wall portions 40b, 41b have a tapered shape whose outer diameter gradually increases so as to match the inner peripheral surfaces of the fitting grooves 22a, 22b.
It protrudes from 1 toward the other side. Hereinafter, the two partition plates 40 and 41 will be referred to as a first partition plate 40 and a second partition plate 41 sequentially from the opening side of the casing 21 as needed.

These partition plates 40, 41 are fitted into the respective fitting grooves 22a, 22b through the outer peripheral walls 40b, 41b with the outer peripheral walls 40b, 41b facing the opening side of the casing 21. It is fitted and held. Here, in order to fit and hold the partition plates 40, 41 in the fitting grooves 22a, 22b of the casing part 21, as shown in FIG. 3, the partition plates 40, 41b are elastically deformed while the outer peripheral wall portions 40b, 41b are deformed. , 41 from the opening of the casing portion 21 by being pressed into the casing portion. In this case, according to the rotary pump of the present embodiment, as described above, the inner diameter of the casing portion 21 gradually decreases from the opening side to the base end side, and the minimum inner diameter of the first fitting groove 22a is the second inner diameter. Since the second partition plate 41 is formed so as to substantially coincide with the maximum inner diameter of the fitting groove 22b, the second partition plate 41 may be fitted into the first fitting groove 22a during the pressing and inserting of the second partition plate 41. There is no danger of the inconvenience, and the operation can be easily performed.

The two partition plates 40, 41 are provided with guide vanes 50, 51 on the end faces thereof facing the opening side of the casing 21, respectively, and are provided on the end faces facing the base end side of the casing 21. Mouse ring 60,61
Is provided. The guide blades 50 and 51 are provided in the casing 2.
The water discharged from the impellers 10A and 10B located on the opening side of the first impeller 10B is supplied to the suction port 11 of the next impellers 10B and 10C.
B, 11C, which constitutes a passage for guiding the partition walls 40, 41 and the guide blade support plate 7
0, 71 are provided radially. Mouse ring 6
Reference numerals 0 and 61 denote ring-shaped flat plate members formed of a resin material such as Teflon (trade name: polyfluorinated ethylene fiber), and partition plate plates via mouth ring receivers 80 and 81 and mouth ring covers 90 and 91. 40, 41. Each of the mouth rings 60, 61 is provided with a suction port 11B, 11 in the second and third impellers 10B, 10C.
It is arranged so as to surround the outer circumference of C, and has a function of supporting the rotation of the impellers 10B and 10C.

On the other hand, a suction bracket 100 is attached to the casing 21 at the opening end thereof. The suction bracket 100 is formed by casting, similarly to the pump bracket 20, has an annular fitting wall 101 on one end surface, and is fitted into the opening of the casing portion 21 via the fitting wall 101. Further, the casing portion 21 is held in such a manner that the opening of the casing portion 21 is closed by fastening a plurality of portions with bolts 110. An O-ring 120 is provided on the fitting wall 101 of the suction bracket 100 to prevent water leakage from between the casing bracket 21 and the fitting wall 101.

The suction bracket 100 has a water inlet 1
02 and a mouth ring 62 are provided. Water intake 102
Is an opening provided on an extension of the output shaft 2 and is connected to a water supply source through a water suction pipe (not shown) after screwing the suction nipple 111. A plurality of suction nipples 111 having different diameters are prepared, and by selectively screwing them, it becomes possible to connect water suction pipes having different diameters. The mouse ring 62 is connected to the first impeller 10.
A for supporting the rotation of A, and has the same configuration as that described above, and a mouth ring cover 9 is provided on an annular mouth ring receiving wall 103 provided on the periphery of the opening of the water inlet 102.
2 is held.

Reference numeral 130 in the figure denotes a mechanical seal member provided at the base end of the output shaft 2, and reference numeral 25 in the figure denotes a cable for laying the electric motor 1 or a tool such as a spanner. An opening for insertion.

In the rotary pump configured as described above, a first pump working chamber 150A for the first impeller 10A is defined between the suction bracket 100 and the first partition plate 40 inside the casing portion 21. With
A second pump working chamber 150B for the second impeller 10B between the first partition plate 40 and the second partition plate 41;
Is further defined between the second partition plate 41 and the base end of the casing portion 21 for the third impeller 10C.
A pump working chamber 150C will be defined. These first to third pump working chambers 150A, 150B, 150
C communicates with each other through guide vanes 50, 51 of partition plates 40, 41 disposed therebetween.

When the electric motor 1 is driven in the rotary pump, the three impellers 10A, 10B, and 10C provided on the output shaft 2 respectively rotate, and first, the first impeller 10A passes through the water inlet 102 of the suction bracket 100. Water will be sucked in. 1st impeller 1
The water sucked into the first pump working chamber 150A and the guide vane 50 are discharged into the second pump working chamber 150A after being discharged in the radial direction.
It is sucked into the impeller 10B. The water sucked into the second impeller 10B is discharged again in the radial direction,
After being sucked into the third impeller 10C through the pump working chamber 150B and the guide blades 51 and finally discharged into the third pump working chamber 150C, it is pressure-fed to a desired height position via the periphery of the electric motor 1. become.

Here, according to the rotary pump of the present embodiment, the above-mentioned three pump working chambers 150A, 150B,
150C are defined inside the casing 21 extending integrally from the pump bracket 20, and the respective joints are not exposed to the outside, but only the joint between the casing 21 and the suction bracket 100. The part is only exposed to the outside. Therefore, in order to prevent leakage of water to the outside, it is sufficient to apply a sealing process (120) to the joint between the casing portion 21 and the suction bracket 100. Work can be facilitated. Moreover, the three pump working chambers 150 defined inside the casing portion 21
Since A, 150B, and 150C are not affected by a position shift or the like even when subjected to an external impact, water leakage does not occur due to the impact. Further, when the number of impellers is increased to increase the head of the rotary pump, it is possible to extend the length of the casing 21. In this case, the number of places where the sealing process is performed does not increase in accordance with the extension of the casing portion 21, and there is no possibility that the manufacturing operation becomes complicated.

In the first embodiment described above, when the partition plates 40, 41 are held at predetermined positions of the casing portion 21, the fitting grooves 22a, 22
The outer peripheral wall portions 40b and 41b for fitting into the fitting grooves 22a and 22b are provided at the outer edge portions of the partition plates 40 and 41, but the present invention is not limited to this. .

For example, in the rotary pump according to the second embodiment shown in FIGS. 4 to 6, the enlarged diameter portion 23 for fitting the outer peripheral collars 160, 161, 162 is provided on the inner wall of the casing portion 21 ', The outer edges of the partition plates 40 ', 41' are simply formed in a flat plate shape.
The outer edge of 41 'is appropriately adjusted to the outer peripheral collars 160, 161, 16
2 so that the partition plate 40 ',
41 'is held in a predetermined position. In this case, the first partition plate 4
The position of the outer peripheral collar 160 fitted on the opening side from 0 'is regulated via the fitting wall 101 of the suction bracket 100.

In the rotary pump according to the third embodiment shown in FIGS. 7 and 8, the enlarged diameter portion 2
3, the outer peripheral portions of the partition plates 40 ", 41" are bent to form cylindrical outer peripheral walls 40b ", 41b", and the outer peripheral walls 40 of the partition plates 40 ", 41" are formed.
The partition plates 40 "and 41" are held at predetermined positions by fitting b "and 41b" to the enlarged diameter portion 23. In this case, the first partition plate 4
0 ", the fitting wall 10 of the suction bracket 100 '
1 'is extended and the position thereof is regulated by bringing the tip of the fitting wall 101' into contact.

In the rotary pumps of the second and third embodiments, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In the rotary pumps of the second and third embodiments, the three pump working chambers 150A, 150
Since each of 50B and 150C is defined inside casing 21 'extending integrally from pump bracket 20', casing 21 'and suction bracket 10' are defined.
If the sealing treatment (120) is applied only to the joint with 0,100 ', water leakage to the outside can be effectively prevented, and the manufacturing operation of the rotary pump can be facilitated, and the impact from the outside can be reduced. No water leakage is introduced. Also, as in the first embodiment, when the number of impellers is increased to increase the head of the rotary pump, the number of places where the sealing process is performed does not increase, and the manufacturing operation does not become complicated. Further, according to the rotary pump of the second embodiment, since a simple disk-shaped partition plate may be applied as the partition plates 40 "and 41", these partition plates 40 "and 4" may be used.
The molding of 1 ″ is also very easy.

Further, in the rotary pump according to the third embodiment, as in the rotary pump according to the modification shown in FIG. 9, the inner wall 23 'of the casing 21' and the partition plates 40 ", 41".
It is possible to provide a gap 170 between the outer peripheral wall portions 40b ", 41b". The effect can be expected. Further, if the gap 170 is filled with a material having a high sound absorbing effect, such as urethane, the above-described effects become more remarkable. In the rotary pump of this modification, a partition plate 42 "is provided on the partition plate 40", and a pump working chamber 150A of the first impeller 10A is defined by the outer peripheral wall 42b "of the partition plate 42". It is.

Also in the rotary pump of this modification, the three pump working chambers 150A, 150B and 150C are each defined inside the casing 21 'extending integrally from the pump bracket 20'. 2
If the sealing process (120) is applied only to the joint between the 1 'and the suction bracket 100, water leakage to the outside can be effectively prevented, and the manufacturing operation of the rotary pump can be simplified, and the external pump can be easily manufactured. No water leakage is caused by the impact. Also, when the number of impellers is increased in order to increase the head of the rotary pump, the number of places where the sealing process is performed does not increase, so that the manufacturing operation is not complicated.

In each of the first to third embodiments and the modified examples described above, a rotary pump having three impellers is exemplified. However, even if the number of impellers is two or less, the number of impellers is four or more. It does not matter.

For example, in the case of a rotary pump having two or more impellers, the same configuration can be achieved by applying any one of the above-described first to third embodiments. That is, the extension length of the casing portion is appropriately adjusted according to the number of impellers, and the partition plate is disposed between the impellers by applying any of the methods described in the first to third embodiments. What should I do?

On the other hand, in the case of a rotary pump provided with only one impeller, a partition plate is not required, so that FIG.
As in the fourth embodiment shown in FIG.
Is shorter than that of the first to third embodiments, and the boss portion 12 of the impeller 10 is screwed to the mechanical seal member 130 and the output shaft 2.
0, and only one pump working chamber 150 is defined between the suction bracket 100 and the casing portion 21 ″ inside the casing portion 21 ″. In the rotary pump according to the fourth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

Also in the rotary pump of the fourth embodiment, the pump working chamber 150 is defined inside the casing 21 "extending integrally from the pump bracket 20", so that the casing 21 "and the suction bracket are formed. If the sealing treatment (120) is applied only to the joint portion with 100, water leakage to the outside can be effectively prevented, and the manufacturing work of the rotary pump can be simplified, and water leakage is caused by external impact. Never be.

FIG. 11 shows a fifth embodiment of the rotary pump according to the present invention.
1 shows an embodiment. This rotary pump is different from the rotary pumps of the first to fourth embodiments in that a suction casing 210 is provided with a tubular casing portion 211, and the suction bracket 210 is provided with respect to a pump bracket 200 provided with the electric motor 1. The pump operating chamber 1 of the impeller 10 is disposed between the casing portion 211 of the suction bracket 210 and the pump bracket 200 by disposing
50 are defined.

In the rotary pump according to the fifth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

Also in the rotary pump according to the fifth embodiment, the working pump chamber 150 is defined inside the casing portion 211 integrally extending from the suction bracket 210, so that the casing portion 211 and the suction bracket 210 If the sealing treatment (120) is applied only to the joint, water leakage to the outside can be effectively prevented, and the manufacturing work of the rotary pump can be simplified, and water leakage is caused by external impact. There is no.

In the rotary pump according to the fifth embodiment, as in the first to third embodiments, the casing 21 extending integrally from the suction bracket 210 is used.
Needless to say, a partition plate may be appropriately disposed inside 1 and a plurality of impellers may be disposed on the output shaft 2.

In each of the above-described embodiments, the electric motor is used as a drive source, but other drive sources may be used. In this case, it is not necessary to dispose the impeller directly on the output shaft of the drive source, and a reduction gear or the like may be appropriately interposed between the output shaft of the drive source and the impeller. Further, it is not always necessary to apply a rotary drive source, and for example, a reciprocating drive source may be applied. Further, although a rotary pump for water supply is illustrated, the present invention can be applied to a pump for pumping other liquids. Further, although the periphery of the driving source is covered with the sucked liquid, it is not always necessary to guide the sucked liquid to the periphery of the driving source. In this case, it is not always necessary to suck the liquid from the distal end of the output shaft, and the liquid sucked from the base end of the output shaft may be discharged to the distal end of the output shaft.

In the above-described embodiment, each of the pump bracket and the suction bracket is formed by casting. However, these may be formed of resin. Further, either one of the pump bracket and the suction bracket extends in a cylindrical shape, but both may extend in a cylindrical shape to accommodate the impeller therein.

[0043]

As described above, according to the present invention,
Because the impeller is accommodated in a portion that extends cylindrically from the pump bracket, or because the impeller is accommodated in a portion that extends cylindrically from at least one of the pump bracket and the suction bracket. In any case, the places where the sealing process is performed can be minimized, and the manufacturing operation can be facilitated. In addition, there is no possibility that misalignment between the components will be caused by an external impact, and no leakage of the liquid to the outside due to the misalignment will occur. Further, even when a plurality of impellers are provided, there is no need to increase the number of places where the sealing process is performed, so that there is no possibility that the manufacturing operation becomes complicated as the number of impellers increases.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a rotary pump according to the present invention.

FIG. 2 is an exploded view showing a main part of the rotary pump shown in FIG.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is a sectional view showing a second embodiment of the rotary pump according to the present invention.

FIG. 5 is an exploded view showing a main part of the rotary pump shown in FIG.

FIG. 6 is an enlarged view of a main part of FIG. 5;

FIG. 7 is a sectional view showing a third embodiment of the rotary pump according to the present invention.

8 is an exploded enlarged view showing a main part of the rotary pump shown in FIG.

FIG. 9 is a sectional view showing a modification of the rotary pump shown in FIG.

FIG. 10 is a sectional view showing a fourth embodiment of the rotary pump according to the present invention.

FIG. 11 is a sectional view showing a fifth embodiment of the rotary pump according to the present invention.

FIG. 12 is a sectional view showing a conventional rotary pump.

13 is an exploded enlarged view showing a main part of the rotary pump shown in FIG.

[Explanation of symbols]

10, 10A, 10B, 10C Impeller 11, 11A, 11B, 11C Suction port 12, 12A, 12B, 12C Boss 20, 20 ', 20 "Pump bracket 21, 21', 21" Casing 21a, 21b, 21c Cylindrical -Shaped portions 22a, 22b Fitting grooves 23 Large diameter portions 25 Openings 30, 31 Intermediate collars 40, 41, 40 ', 41', 40 ", 41", 42 "
Partition plate 40a, 41a Inner peripheral wall 40b, 41b, 40b ', 41b' Outer peripheral wall 40c, 41c Through hole 50, 51 Guide blade 60, 61, 62 Mouse ring 70, 71 Guide blade support plate 80, 81 Mouse ring receiver Table 90, 91, 92 Mouth ring cover 100, 100 'Suction bracket 101, 101' Fitting wall 102 Water inlet 103 Mouth ring receiving wall 110 Bolt 111 Suction nipple 120 O-ring 130 Mechanical seal member 140 Fastening bolt 150, 150A , 150B, 150C Pump working chamber 160, 161, 162 Outer collar 170 Gap 200 Pump bracket 210 Suction bracket 211 Casing part

Claims (2)

[Claims] 1. A rotary pump in which an impeller is rotated by driving a drive source provided on a pump bracket, wherein the pump bracket is extended in a cylindrical shape, and the impeller is housed in the interior thereof. Rotary pump. 2. A rotary pump in which an impeller disposed between the pump bracket and the suction bracket is rotated by driving a driving source provided on the pump bracket, wherein at least one of the pump bracket and the suction bracket is rotated. A rotary pump characterized by extending in a cylindrical shape, connecting the two, and accommodating the impeller in a portion extending in the cylindrical shape.