JP2984165B2 - All circumferential pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an all-circumferential pump having a sheet metal pump casing, and more particularly to an all-circumferential pump having a pump casing made by press-forming a steel plate such as stainless steel.

[0002]

2. Description of the Related Art Conventionally, a pump casing is manufactured by deep drawing a single steel plate such as stainless steel by pressing. Such a pump casing is
In order to attach the casing to the mating part, the casing flange has been integrally formed by press molding. A pressure load corresponding to the opening area is applied to the casing flange, and a breaking strength against this and a rigidity for securing a sealing surface are required. In the casing, the thickness of this portion is the thickest. Conventionally, in a casing made of a press, since both the casing flange and other parts are formed with substantially the same plate thickness, the entire pump casing is formed with a plate thickness not required except for the casing flange, or the outer periphery of the casing flange is formed. Various reinforcements such as providing a cylindrical reinforcing portion bent from the outer edge of the flange and extending in the axial direction, or providing another reinforcing member of the same material as that of the casing main body are provided in the portion.

[0003]

As described above, in the conventional pump casing made of a press, the thickness of the casing is increased in order to secure the rigidity of the casing flange. There is a problem that the thickness is so large that the difficulty of press molding is high. In addition, there is a problem that the material is uneconomical.

[0004] On the other hand, in the case where a cylindrical reinforcing portion is provided on a casing flange to reinforce it, there is a problem that the shape of the casing becomes complicated and press molding is difficult. Also,
When a separate reinforcing member is provided in the casing, the number of components increases for reinforcement, and there is a problem that productivity is poor.

The present invention has been made in view of the above circumstances, and an object thereof is to increase the thickness of a casing body more than necessary in order to secure rigidity of a casing flange for attaching a pump casing to a mating part. It is an object of the present invention to provide a full-circumferential pump having a sheet metal pump casing that does not need to be thicker and does not require a reinforcing portion or a reinforcing member for reinforcing a casing flange.

[0006]

In order to achieve the above-mentioned object, a full-circumferential pump according to a first aspect of the present invention comprises a pump casing and an outer peripheral portion of a motor provided in the pump casing. An all-circular flow type pump having an annular flow path formed therein, a sheet metal suction side casing having a suction nozzle, and a sheet metal casing connected to the suction side casing and provided on the outer peripheral side of the motor. A cylinder, the suction-side casing and the casing outer cylinder each have a flange portion extending outward at an end outer peripheral portion, and the flange portion is integrally connected by being clamped by the flange ,
The flange on the suction side casing side is made of an integral member.
Further, the flange on the casing outer cylinder side is divided . In addition, a gasket is interposed between the two flanges to be sandwiched. In addition, other than the present invention
Is characterized in that the pump casing and the pump casing
An annular flow path is formed between the motor and the outer periphery of the motor.
Sheet pump with suction nozzle
Connected to the suction-side casing and the suction-side casing.
And a sheet metal case provided on the outer periphery of the motor.
A suction outer casing, and the suction side casing and the casing.
The outer cylinder has a flange that extends outward from the outer periphery of each end.
The flange portion is clamped by the flange,
Connected to the body, detachable to the suction side casing
It is characterized by having a suction flange
is there.

[0007] The all circumferential flow type pump according to the second aspect of the present invention comprises:
In a full-circumferential pump in which an annular flow path is formed between a pump casing and an outer peripheral portion of a motor provided in the pump casing, a discharge-side casing made of sheet metal having a discharge nozzle, and the discharge-side casing And a sheet metal casing outer cylinder provided on the outer peripheral side of the motor, and the discharge side casing and the casing outer cylinder are
Each has a flange portion extending outward on the outer periphery of the end portion, and the flange portion is integrally connected by being clamped by a flange, and the flange on the discharge side casing side is formed from an integral member.
The flange on the casing outer cylinder side is divided . Another aspect of the present invention
Are provided in the pump casing and the pump casing.
Whole circumference with an annular flow path formed between the motor and the outer periphery of the motor
In a flow type pump, sheet metal discharge with a discharge nozzle
Side casing and when connected to the discharge side casing
Outside the sheet metal casing provided on the outer periphery of the motor
A discharge side casing and a casing outer cylinder.
Each has a flange portion extending outward on the outer periphery of the end portion.
The flanges are sandwiched by the flanges to form
The discharge side casing is connected to a detachable discharge
A flange is provided.

[0008]

According to the first aspect of the present invention having the above-described structure, the flange provided on the outer peripheral portion of the opening side of the suction side casing and the outer peripheral portion of the end portion of the casing outer cylinder are provided. The suction side casing and the casing outer cylinder can be integrally connected by sandwiching the flange portion formed by the flange made of a member different from those of the casing parts.
Therefore, the thickness of the casing can be reduced as compared with a conventional casing in which the casing flange is integrally formed by press forming, and the shape of the casing is simplified, so that press forming is facilitated. In addition, the maximum diameter of the casing is reduced, and the plate material can be saved.
In addition, by interposing a gasket between the two flanges, it is possible to seal between the flanges.

According to the second aspect of the present invention, a flange provided on an outer peripheral portion of an end of the discharge side casing on the opening side, and a flange provided on an outer peripheral portion of an end of the casing outer cylinder. Are sandwiched between flanges formed of members separate from these casing components, whereby the discharge side casing and the casing outer cylinder can be integrally connected.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an all-circumferential pump having a sheet metal pump casing according to the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view showing an all circumferential flow type in-line pump provided with a sheet metal pump casing of the present invention. The all circumferential flow type inline pump shown in the present embodiment includes a suction side casing 1, a discharge side casing 5, and an outer cylinder 9 connecting the suction side casing 1 and the discharge side casing 5.
And The suction-side casing 1 and the discharge-side casings 1 and 5 are formed by deep-drawing a steel plate such as stainless steel by pressing. The outer cylinder 9 is also made of a steel plate such as stainless steel.

As shown in FIGS. 1 and 2, the suction-side casing 1, the outer cylinder 9 and the discharge-side casing 5 are each provided with an outwardly extending flange 1a at the outer periphery of the end on the opening side. , 9a, 9b, 5a. The flange 1a, 9a adjacent to the suction side casing 1 and the outer cylinder 9 via the sealing member 8 are formed of a flange 2 made of a casting such as cast iron.
By being clamped by OA and 20B and being fastened by bolts 37a and nuts 37b, they are integrally connected. Also, the discharge side casing 5 and the outer cylinder 9
Is a flange portion 5 that is similarly adjacent via a seal member 8.
a and 9b are clamped by flanges 21A and 21B made of a casting such as cast iron and a bolt 37a and a nut 37b.
Are connected together by being tightened. Note that the seal member 8 is formed of an elastic material such as rubber.

Suction side casing 1, discharge side casing 5
And the outer cylinder 9 constitute a sheet metal pump casing,
A canned motor 22 is provided in the pump casing.

The flanges 20A, 21A on the suction side casing 1 and the discharge side casing 5 side are formed as annular integral members, and the flanges 20A, 21A have concave portions 20a, 2 respectively.
The flanges 1a, 9a; 5a, 9b are accommodated in the recesses 20a, 21a. And
When the flanges 20A and 20B and the flanges 21A and 21B are tightened, the flange surfaces are in surface contact. As a result, the gasket 8 of the face seal is formed by the concave portions 20a and 21a provided in the flanges 20A and 21A.
, And the protrusion of the face seal by the internal pressure of the gasket 8 can be prevented. Further, the suction side casing 1 and the flange 20A and the discharge side casing 5 and the flange 21A are assembled with an interference fit so as not to be easily removed.

On the other hand, the flange 20 on the casing outer cylinder 9 side
B and 21B correspond to FIGS. 3 (a) and 3 (b) (FIG. 3 (a)
Is a sectional view, and FIG. 3 (b) is a side view), so that the flanges 1a, 9a; 5a, 9b are integrated when sandwiched.

The suction side casing 1 includes a main body 2 having a substantially cylindrical container shape, and an annular suction nozzle 3 joined to the main body 2 and extending on the suction side. Similarly to the suction-side casing 1, the discharge-side casing 5 also includes a substantially cylindrical container-shaped main body 6 and an annular discharge nozzle 7 joined to the main body 6 and extended to the discharge side. .

On the other hand, an inner casing 10 is provided inside the suction side casing 1, and this inner casing 10
Is composed of a partition plate 11 made of sheet metal on the suction side, and a guide device 12 connected to the partition plate 11 and made of a resin material or the like constituting a guide vane or volute. The guide device 12 has a spigot fitting portion, and the spigot fitting portion is fitted to the frame side plate 25 of the canned motor 22. The frame side plate 25 of the canned motor 22 has high rigidity, and the guide device 12 is supported by the motor frame side plate 25. As a result, the inner casing 10 has a highly rigid canned motor 22.
Is supported by the frame side plate 25. And
A seal member 14 is interposed in a gap between the partition plate 11 of the inner casing 10 and the suction side casing 1, and the suction side (low pressure side) and the discharge side (high pressure side) are sealed by the seal member 14. I have.

An impeller 15 is housed inside the inner casing 10, and the impeller 15
Is fixed and supported on the main shaft 16 of the main body. Inner casing 1
A liner ring 19 is provided at the inner end of the zero partition plate 11, and a slight clearance is formed between the liner ring 19 and the edge 15 a of the impeller 15.

A suction flange 31 and a discharge flange 32 are fixed to the annular suction nozzle 3 and the discharge nozzle 7, respectively. That is, the suction nozzle 3 and the discharge nozzle 7 are made of stainless steel or the like made of the same material as the casing main body, have external thread portions 3c and 7c on the outer peripheral portion, and have a front end face sealing with a mating flange (not shown). 3s,
7s. On the other hand, the suction flange 31 and the discharge flange 32 are made of a material different from that of the casing body, for example, cast iron (FC) or the like, and have internal thread portions 31a and 32a at their inner ends, respectively. , 3
It is screwed and fixed to the suction nozzle 3 and the discharge nozzle 7 by 2a.

In FIG. 2, the flange 20A (or 21A) is an integral flange.
A (or 21A) flange inner diameter D _A is suction flange 3
1 (or discharge flange 32) when the outer diameter D _B is smaller than of, for suction flange 31 (or discharge flange 32) gets in the way when you remove the flange 20A (or 21A), screwed the inlet flange 31 (or the discharge flange 32) is first removed, and then the flange 20A is removed.
(Or 21A) is removed. Conversely, flange 20A
(Or 21A) when attaching the flange 20A
(Or 21A), the suction flange 31
(Or the discharge flange 32).

On the other hand, the motor frame 23 of the canned motor 22 has a substantially cylindrical frame outer shell 24 and frame side plates 2 provided at both side openings of the frame outer shell 24.
5 and 26. The outer frame 24 is
A plurality of ribs 24a are radially formed on the outer peripheral surface. The plurality of ribs 24a are formed integrally with the outer frame 24 of the motor frame by press molding, and the outer surfaces of the ribs 24a are fitted to the inner peripheral surface of the outer cylinder 9 of the pump casing. Both parts are joined and integrated by spot welding or the like.

A lead wire outlet 24b is formed in one of the ribs 24a.
The lead wire of the motor is taken out from b, and this lead wire passes through an opening 9c formed in the outer cylinder 9 and is taken out to a terminal box 38 fixed to the outer cylinder 9.

Outer frame 2 of the canned motor 22
4, a stator 27 and a rotor 28 are provided. The rotor 28 is supported by the main shaft 16, and a cylindrical can 29 is fitted inside the stator 27. A bearing housing 31 is detachably provided on the frame side plate 25 via an elastic body 30, and a radial bearing 32 that rotatably supports a shaft sleeve 33 fitted to the main shaft 16 is held in the bearing housing 31. ing.

A bearing housing 35 is detachably provided on the frame side plate 26 via an elastic body 34. The bearing housing 35 holds a radial bearing 36 and a fixed-side thrust metal 37, respectively. Yes,
The radial bearing 36 is a shaft sleeve 3 fitted to the main shaft 16.
8 is rotatably supported. On the other hand, a thrust disk 39 is fixed to the discharge-side end of the main shaft 16, and the thrust disk 39 includes a rotation-side thrust metal 40 that comes into sliding contact with the fixed-side thrust metal 37. Note that the bearing housing 35 is pressed by a pressing plate 42 fixed to the discharge-side casing 5.

The operation of the in-line pump will be briefly described. The fluid sucked from the suction nozzle 3 is the impeller 1
5 is led. After the fluid discharged from the rotating impeller 15 changes its flow direction from the radial direction to the axial direction via the guide device 12 of the inner casing 10, the fluid flows between the outer cylinder 9 and the motor frame outer body 24 of the canned motor 22. It flows into the flow path 45 formed between the flow paths, and flows into the discharge side casing 5 through the flow path 45. Thereafter, the fluid is discharged from the discharge nozzle 7 provided on the discharge side casing 5.

According to the present embodiment, the flanges 1a, 5a provided on the outer periphery of the opening side end of the suction side casing 1 and the discharge side casing 5 are formed by flanges 20A, 20B made of a member separate from the casing; The suction side casing 1 and the discharge side casing 5 can be connected to the casing outer cylinder 9 by being sandwiched between the casings 21A and 21B. Therefore, the thickness of the casing can be reduced as compared with a conventional casing in which the casing flange is integrally formed by press forming, and the shape of the casing is simplified, so that press forming is facilitated. In addition, the maximum diameter of the casing is reduced, and the plate material can be saved.

When the casing is made of stainless steel plate in consideration of corrosion resistance, the flanges 20 and 21 made of a member separate from the casing are non-wetted parts, so that it is not necessary to use expensive stainless steel. Material costs can be reduced. Furthermore, since the flanges 20 and 21 are formed with the concave portions 20a and 21a for accommodating the flange portions 1a, 5a, 9a and 9b of the casing, the casing can be prevented from being displaced by an external force.

Next, an embodiment provided with a rotation preventing mechanism applied to the suction side casing or the discharge side casing 5 is shown in FIG.
This will be described with reference to FIG. FIG. 4 is a cross-sectional view of a main part showing the rotation stopping mechanism, and FIG. 5 is a view taken along line VV of FIG. A pin 50 is implanted on the flange 20A, and a notch 1b for engagement is provided on the flange 1a of the suction side casing 1, and a notch 9d for engagement is also provided on the flange 9a of the outer cylinder.
Then, a gasket 8 is interposed between the flange 9a of the outer cylinder 9 and the flange 1a of the suction side casing 1, and another flange 20B is provided opposite to the flange 20A. Of the suction side casing 1 and the outer cylinder 9 by tightening the
And are integrated. At this time, the notch 1b and the notch 9d engage with the pin 50. According to the present embodiment, the suction side casing 1 can be prevented from rotating with respect to the flange 20A by the pin 50 and the notch 9d engaged with the pin 50. Since the mounting position of the pin 50 is the concave portion 20a of the flange 20A, the pin 50 does not protrude, and the assembling work becomes easy.

Next, another embodiment having a casing rotation preventing mechanism will be described with reference to FIGS. 6 and 7. FIG. FIG. 6 is a cross-sectional view of a main part showing a rotation stopping mechanism, and FIG.
FIG. 7 is a view taken along line VII. Flange 1a of suction side casing 1
A notch 1b for engaging with the flange mounting bolt 37a is provided at the same time, and a notch 9d for engaging with the flange mounting bolt 37a is also provided at the flange 9a of the outer cylinder 9. The gasket 8 is interposed between the flange 9a of the outer cylinder 9 and the flange 1a of the suction side casing 1, and the flange 20
The suction side casing 1 and the outer cylinder 9 are integrated with each other by providing a separate member flange 20B facing A and tightening the flange 20A and the flange 20B with the flange mounting bolts 37a. At this time, the notch 1b and the notch 9d engage with the flange mounting bolt 37. According to this embodiment, the suction side casing 1 can be prevented from rotating with respect to the flange 20A by the flange mounting bolts 37a and the notches 1b engaging with the flange mounting bolts 37a.

In the embodiments shown in FIGS. 4 to 7, the suction side casing has been described as an example, but the present invention can be similarly applied to the discharge side casing.

[0030]

As described above, according to the present invention,
A flange provided on an outer peripheral portion of an end on the opening side of the suction side casing and a flange provided on an outer peripheral portion of an end portion of the casing outer cylinder are sandwiched by flanges formed of members separate from these casing components. Thereby, the suction side casing and the casing outer cylinder can be integrally connected. Therefore, the thickness of the casing can be reduced as compared with a conventional casing in which the casing flange is integrally formed by press forming, and the shape of the casing is simplified, so that press forming is facilitated. And the casing outer cylinder
Side flange is split so that the suction side casing
Side flange and the casing outer cylinder side flange.
When connecting the suction side casing to the casing outer cylinder
The flange on the casing outer cylinder side to the length of the casing outer cylinder.
There is no need to go long in the hand direction. The discharge side
Casing side flange and casing outer cylinder side flange
The relationship is the same. In addition, the maximum diameter of the casing is reduced, and the plate material can be saved. The above 2
By interposing a gasket between the two flanges, it is possible to seal between the flanges.

Further, according to the present invention, the flange provided on the outer peripheral portion of the end of the discharge side casing on the opening side and the flange provided on the outer peripheral portion of the end of the casing outer cylinder are connected to the casing. By sandwiching the casing with a flange made of a member separate from the components, the discharge side casing and the casing outer cylinder can be integrally connected.

According to the present invention, even when the casing is made of a stainless steel plate in consideration of corrosion resistance, expensive stainless steel is used because the flange made of a member separate from the casing is a non-wetted part. There is no need, and material costs can be reduced.

Further, according to the present invention, the recess for accommodating the flange of the casing is formed in the flange, so that the tightening torque of the bolt can be easily controlled, and
When a gasket for sealing is interposed, it is easy to control the interference of the gasket. In addition, positioning during assembly is facilitated, and displacement of the casing due to external force can be prevented.

Furthermore, according to the present invention, since the engaging portion for engaging with the engaging member or the flange mounting bolt provided on the flange is formed on the flange portion of the casing, the casing is prevented from rotating against external force. Can be.

Further, according to the present invention, since the suction flange or the discharge flange is made detachable, even if the inner diameter of the flange for holding the flange is smaller than the outer diameter of the suction flange or the discharge flange, the flange for holding the flange can be used. The flange can be removed.

[Brief description of the drawings]

FIG. 1 is a sectional view of an all-circumferential pump provided with a sheet metal pump casing according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a view showing a flange on a casing outer cylinder side;
FIG. 3A is a sectional view, and FIG. 3B is a side view.

FIG. 4 is a cross-sectional view showing a casing detent mechanism in the all-circumferential pump according to the present invention.

FIG. 5 is a view taken along line VV of FIG. 4;

FIG. 6 is a cross-sectional view showing another example of the casing detent mechanism in the all-circumferential pump according to the present invention.

FIG. 7 is a view taken along line VII-VII of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Suction side casing 1a, 5a flange part 3 Suction nozzle 5 Discharge side casing 7 Discharge nozzle 8 Seal member 9 Outer cylinder 10 Inner casing 14 Seal member 15 Impeller 16 Main shaft 20A, 20B, 21A, 21B Flange 31 Suction flange 32 Discharge flange

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F04D 29/44 F04D 29/44 D (72) Inventor Hiromi Sakabe 4-2-1 Motofujisawa, Fujisawa-shi, Kanagawa Prefecture Ebara Corporation Within the Research Institute (72) Inventor Koji Isemoto 4-2-1, Motofujisawa, Fujisawa-shi, Kanagawa Prefecture Within the Ebara Research Institute Co., Ltd. (56) References JP-A 1-1131894 (JP, U) JP-A 54- 67802 (JP, U) Shokai Sho 51-126402 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04D 13/06 F04D 29/42 F04D 29/44

Claims (8)

(57) [Claims] 1. A full-circular flow type pump having an annular flow path formed between a pump casing and an outer peripheral portion of a motor provided in the pump casing, wherein a sheet metal suction side casing having a suction nozzle is provided. And a sheet metal casing outer cylinder connected to the suction side casing and provided on the outer peripheral side of the motor, wherein the suction side casing and the casing outer cylinder are respectively provided to extend outward at an end outer peripheral portion. And the flange portion is integrally connected by being clamped by the flange, and the flange on the suction side casing side is provided.
Is an integral member, and the flange on the casing outer cylinder side
Is a full-circulation pump characterized by being divided . 2. A pump casing and the pump casing.
An annular flow path is formed between the motor and the outer periphery of the motor.
Plate with suction nozzle
Gold suction side casing and connected to the suction side casing
And a sheet metal case provided on the outer peripheral side of the motor.
A suction outer casing, and the suction side casing and the casing are provided.
Sing outer cylinders are respectively extended outward at the outer periphery of the ends
Having a flange portion, the flange portion being clamped by the flange.
Ri connected together, wherein the suction side casing, the entire <br/>-circumferential flow pump you characterized in that detachable suction flange. 3. A process according to claim 1 or 2 full-circumferential flow pump according to, characterized in that the gasket between the flange portion is interposed. 4. The method of claim 1 or 2 full-circumferential flow pump according to, characterized in that a recess for accommodating the flange portion to said flange. 5. An all-circumferential pump in which an annular flow path is formed between a pump casing and an outer peripheral portion of a motor provided in the pump casing, wherein a discharge-side casing made of sheet metal having a discharge nozzle is provided. And a sheet metal casing outer cylinder connected to the discharge-side casing and provided on the outer peripheral side of the motor, wherein the discharge-side casing and the casing outer cylinder are respectively provided to extend outward at end outer peripheral portions. The flange portion is integrally connected by being clamped by the flange, and the flange on the discharge side casing side is provided.
Is an integral member, and the flange on the casing outer cylinder side
Is a full-circulation pump characterized by being divided . 6. A pump casing and the pump casing.
An annular flow path is formed between the motor and the outer periphery of the motor.
Plate with discharge nozzle
Discharge side casing made of gold and connected to the discharge side casing
And a sheet metal case provided on the outer peripheral side of the motor.
A discharge outer casing and a casing.
Sing outer cylinders are respectively extended outward at the outer periphery of the ends
Having a flange portion, the flange portion being clamped by the flange.
Ri is integrally connected to the discharge side casing, the entire <br/>-circumferential flow pump you characterized in that detachable discharge flange. 7. The all circumferential flow type pump according to claim 5, wherein a gasket is interposed between the flange portions. 8. The all circumferential flow type pump according to claim 5 , wherein a concave portion for accommodating the flange portion is formed in the flange.