JP2002122092A - Double pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact double pump, provide with two centrifugal pump parts and capable of reducing the number of parts and cost. SOLUTION: The centrifugal pump parts are respectively constituted by providing a common casing 1, having a common discharge port 20 and a common suction port 24 on a cylindrical peripheral wall and openings 5 for mounting an electric motor at both ends in the axial direction and fixing a pair of volute casings 8 and arranging an impeller 4 in the common casing 1. Outlets 19 of each centrifugal pump part are collected in the common discharge port 20, and the electric motor 11 is connected with the openings 5 through respective motor mounting bases 9. A main shaft 12 of the electric motor 11 is made protrude in the corresponding volute casing 8, and the impeller 4 is fixed directly to the electric motor main shaft 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump used in a water supply facility or an air conditioning facility, and more particularly to a double pump suitable for use in a stand-alone operation, a parallel operation or an alternate operation with two pumps constantly provided. .

[0002]

2. Description of the Related Art In a water supply device using two pumps, in order to cope with a failure and improve operation efficiency,
In general, a system in which single operation is performed with a small amount of water and parallel operation is performed with two units when the amount of water becomes large from medium. Conventionally, FIG.
As shown in FIG. 2, two independent pumps P1 are
2, a single pump multiple installation type (unit type) in which the discharge ports 105 of the respective pumps P1 are gathered in a common discharge pipe 103 is often used. Motor 1 for each pump P1
01 is arranged horizontally. In the unit type, as shown in FIG.
7 are connected, and both suction pipes 107 are connected to a suction header pipe (suction collecting pipe) 108. For example, two water receiving tanks 110 are provided, and each of them is connected to the suction header tube 108 so that water can be taken in from any of them.

In order to facilitate the installation and piping work for a unit type in which two single pumps P1 are mounted on the common bed 102, a pair of pumps are provided in a common casing 112 as shown in FIG. Forming a volute 113 of
A double pump incorporating a pair of centrifugal pumps has been developed by disposing impellers 114 in each volute 113 (Japanese Utility Model Publication No. 57-17193).

In the double pump shown in FIG. 34, a common casing 112 is supported on a bed 120 via support legs 116, and each motor 122 is
2 and supported on a bed 120 independently. Bearing cases 124 are provided at both axial ends of the common casing 112.
Are connected, and the pump main shaft 125 is attached to each bearing case 124.
Are rotatably supported, and one end of each pump main shaft 125 passes through a gland packing 126 so that the volute 1
13, and an impeller 114 is fixed to a tip portion thereof. The other end of the pump main shaft 125 projects outside from the bearing case 124, and is connected to the main shaft 131 of the electric motor 122 via a joint 130.

[0005]

(1) FIGS. 28 to 30
Problem of single pump and multiple installation type. As shown in FIG. 30, the discharge ports 1 of the two independent pumps P1
A common discharge pipe 103 for assembling the suction headers 105 is separately required, and a suction pipe 107 is connected to each suction port 106 of each individual pump P1 as shown in FIG.
08, the piping structure becomes complicated. Further, although not shown, in the pump unit for air conditioning, the discharge side and the suction side must be piped separately for each pump.

In a water supply device, a plurality of single pumps are often housed in a box body. However, as shown in FIG. 31, even when two single pumps P1 in which motors 101 are arranged vertically are installed, both pumps P1 are installed. A space for arranging the common discharge pipe 143 is required between them, and the storage size W1 of the box 140 is required.
In addition, W2 in FIG. 32 becomes large, and the installation place is restricted.

[0007] In order to meet the demand for a large amount of water, FIG.
For example, there is a water supply device in which four independent pumps P1 are installed on a common bed 102 as shown in FIG.
Becomes longer, and a collective discharge pipe for unifying the discharge ports 105 of the four pumps P1 is required, so that the cost is greatly increased.

(2) Problems with the double pump shown in FIG. The provision of the common casing 112 facilitates the installation work and reduces the number of members. However, a bearing case 124 is provided in the common casing 112 to support each motor spindle 125, and the common casing 112 and both motors 122 are independently attached to the common bed 120 to connect the motor spindle 131 and the pump spindle 125. , The axial dimension L of the entire double pump
2 becomes longer, and the bed 120 becomes extremely long and heavy. For example, if the total length of the stand alone pump P1 shown in FIG. 35 is L1, the total length L2 in FIG. 34 is about 1.7 times as long as the above L1. Also, it is about 2.3 times as long as the total length L1 of the motor pump type P1 shown in FIG.

In order to install such a long double pump, a correspondingly large space is required, and the installation place is limited. In addition, a long and heavy bed causes an increase in cost.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a double pump in which a pair of volutes are provided in a common casing, and impellers are arranged in the respective volutes. The purpose is to plan.

[Means for Solving the Problems]

In order to achieve the above object, the invention according to claim 1 of the present application comprises a common casing having a common discharge port and a common suction port on a cylindrical peripheral wall and having openings for mounting a motor at both axial ends. By fixing a pair of volute casings in the common casing and arranging the impellers in each volute casing respectively, the centrifugal pump sections are respectively constituted, and the outlets of the respective centrifugal pump sections are gathered in the common discharge port, An electric motor is connected to each of the openings via a motor mount, and a main shaft of each electric motor is projected into a corresponding volute casing, so that an impeller is directly fixed to each electric motor main shaft.

According to a second aspect of the present invention, in the double pump of the first aspect, the entire double pump is supported by supporting legs provided on the motor mount.

According to a third aspect of the present invention, a common discharge port and one
An elliptical common casing having one or a plurality of suction ports and a pair of motor mounting openings arranged in parallel on one axial side wall, and fixing a volute casing in each of the openings; By disposing the impellers in each, a centrifugal pump part is respectively formed, a motor is connected to each opening via a motor mounting base, and a main shaft of each motor is protruded into a corresponding volute casing body. It is characterized in that the impeller is fixed directly to the motor main shaft.

[0014]

First Embodiment FIGS. 1 to 4 show a tandem type double pump P2 to which the inventions according to claims 1 and 2 of the present application are applied.
In this case, a pair of closed type impellers 4 are arranged in series on the same axis O1. In FIG. 1 showing a longitudinal sectional front view, a common casing 1 having a cylindrical outer body 2 and an inner body 3 is provided at a central portion in the axial direction, and the two bodies 2 and 3 are formed at the center in the axial direction. Openings 5 for attaching a motor are formed at both ends in the axial direction of the outer shell 2, respectively, and are integrally formed on the same axis O <b> 1 via a partition wall 6.

A pair of volute casings 8 are inserted into the outer body 2 on both sides in the axial direction.
Are fixed to the common casing 1 by bolts and the like together with a motor mounting base 9 to be fitted in each opening 5 by means of a bolt. By disposing the closed impeller 4 in each volute casing 8, a pair of It constitutes a centrifugal pump unit. An electric motor 11 is fixed to each motor mount 9 on the same axis O1. The main shaft 12 of each electric motor 11 protrudes into the volute casing 8 and is sealed by a mechanical seal 13.
The impeller 4 is directly fixed to the tip.

An L-shaped pump fixing support leg 16 is detachably fixed to the lower portion of each motor mount 9, and the entire double pump is supported on the bed 15 by the both support legs 16.

In FIG. 2 showing a sectional view taken along the line II-II in FIG.
A valve case 21 having a common discharge port 20 is fixed to the outlet 19 of each centrifugal pump section, and a double-port check valve 23 is provided in the valve case 21, and is connected via each check valve 23. An outlet 19 and a discharge port 20 of each centrifugal pump section communicate with each other.
The check valve 23 supports a plate-shaped valve body via a hinge so as to be openable and closable, and allows water to flow from the outlet 19 of the centrifugal pump unit to the common discharge port 20, but the flow of water into the centrifugal pump unit. Is designed to block. Each impeller 4 is integrally formed with a tubular portion 4a, and each tubular portion 4a is fitted on the inner peripheral surface of the inner drum 3 via an annular seal.

FIG. 3 is a side view of FIG.
0 and the suction port 24 are opened in the horizontal direction with a phase difference of 180 ° from each other.

FIG. 4 shows an example in which the discharge port 20 is changed upward. For example, a centrifugal pump outlet is formed at the upper end of the outer shell 2 as a spare for the outlet 19 of the centrifugal pump shown in FIG. At the outlet, as shown in FIG.
A valve case 21 having 0 is attached.

FIG. 5 shows a state in which the tandem type double pump P2 as shown in FIG. 4 is connected to a pair of water receiving tanks 26, and the suction pipe 2 connected to the suction port 24 of the double pump P2.
Numeral 8 is connected to the suction header tube 31. Water intake ports 32 are formed at both ends in the longitudinal direction of the suction header pipe 31, and each water intake port 32 is connected to each water receiving tank 26.

FIG. 6 is a side view of FIG. 5, in which a common discharge pipe 35 is connected to the discharge port 20 formed upward.

[0022]

In FIG. 1, when one vehicle is operated, only one motor 11 is operated to rotate only one impeller 4. The water sucked from the common suction port 24 is sucked into the one volute casing 8 by the rotating impeller 4, pressurized, and pushes the check valve 23 from the one centrifugal pump section outlet 19 to open the discharge port. Discharged to 20.

When two units are operated in parallel, both motors 11 are operated and both impellers 4 are rotated. The water sucked in from the common suction port 24 is sucked into each volute casing 8, pressurized to open the corresponding check valve 23, merge in the valve case 21, and is discharged to the discharge port 20. You.

The double pump P2 having the closed impeller 4 is a so-called general-purpose constant speed type. However, the pump performance is changed and adjusted by variably controlling the rotation speed of the electric motor 11 with an inverter or the like. I do.

In the tandem type double pump P2 having the structure shown in FIGS. 1 to 4, the casing 1 is made common and the impeller 4 is directly fixed to each motor main shaft 12, so that the total length L6 in the axial direction is reduced. 35 can be reduced to about 1.27 times the total length of the single pump P1 in FIG. 35, and can be reduced to about 75% as compared with the conventional example in FIG.
Further, when the common bed 15 is mounted on the common bed 15 as shown in FIG. 1, since the support legs 16 are provided on the motor mounting base 9, the length L5 of the common bed 15 is only required to be about the distance between the motor mounting bases 9. The length can be significantly reduced to about 22% as compared with the length L2 of the 34 common beds 120, and the weight can be reduced, so that the pump installation space can be saved.

[0026]

Second Embodiment FIGS. 7 to 9 show another example of a tandem type double pump P2 to which the inventions according to the first and second aspects of the present invention are applied, wherein a pair of open impellers 40 are the same. It is arranged on the axis O1 line. The structure shown in FIGS.
Although the impeller 40 is different between the closed type and the open type, the other structures are the same, so the same components are denoted by the same reference numerals, and redundant description will be omitted.

In FIG. 7, an open impeller 40 has a blade plate 41 at the center in the axial direction formed separately from an impeller body portion having blades. The pump performance can be changed by facing the axial edge with a predetermined gap therebetween and adjusting the gap.

In FIG. 8, a piston portion 43 is integrally formed on a blade plate 41 via a cylindrical connecting portion 42.
Each piston part 43 is fitted in the inner body 3 of the common casing 1 slidably in the axial direction. An inner partition wall 45 perpendicular to the axis O1 is formed integrally at the axially central portion of the inner peripheral surface of the inner barrel 3, and the inner partition wall 45 partitions the inner body 3 into two piston chambers 46. . Each of the piston chambers 46 is connected to a discharge pressure introduction passage (not shown) for introducing a discharge pressure from the outer body 2, and introduces a pressure regulated by a pilot valve into each of the piston chambers 46 in the middle thereof. Move
As described above, the axial gap between the blade edge and the blade plate 41 is changed, so that the pump performance can be changed and controlled.

FIG. 9 is an enlarged view of a portion indicated by an arrow IX in FIG.
An annular groove 47 is formed on the outer peripheral surface of the piston portion 43, and an O-ring 48 and a piston ring 49 are formed in the annular groove 47.
Are sequentially fitted and are in sliding contact with the inner peripheral surface of the inner trunk 3.

[0030]

The basic operation in the single-unit operation and the two-unit parallel operation is the same as that in the embodiment shown in FIGS.

In operation, by controlling the pressure introduced into the piston chamber 46, the gap between the open-type blade and the blade plate 41 is changed, thereby controlling the discharge pressure.

[0032]

Third Embodiment FIGS. 10 to 13 show a third embodiment of the present invention.
It is an example of the parallel type double pump P3 to which the described invention is applied, in which a pair of closed type impellers 54 are arranged in parallel. In FIG. 11 showing a bottom view, an elliptical common casing 51 is provided in a lying posture (horizontal posture), and a pair of motor mounting openings 53 are formed in parallel on an upper wall of the common casing 51. A common discharge port 56 and a suction port 55 are provided on the peripheral wall of the valve 51. The discharge port 56 is formed in a valve case 60 having a double-port check valve 59, and is formed at a central portion in the length direction of the common casing 51. It is open horizontally. The suction port 55 is formed at a longitudinal end of the common casing 51 and opens horizontally. Support legs 58 are detachably fixed to the lower surfaces of the four corners of the common casing 51, respectively.

In FIG. 10 showing a vertical sectional front view, a volute casing 62 is provided in each opening 53 formed upward.
The motor mount 63 is sequentially fitted and fixed with bolts or the like, and a closed impeller 54 is disposed in each volute casing 62.

On the upper surface of each motor mount 63, a motor 65 is fixed in a vertical position by means of a fitting. The main shafts 66 of the electric motors 65 protrude downward and protrude into the volute casing 62, and the impellers 54 are fixed to lower ends of the main shafts 66, respectively. A mechanical seal 67 is fitted on the inner peripheral surface of the boss portion 61 of the volute casing 62 to seal between the electric motor main shaft 66 and the volute casing 62.

Referring to FIG. 12 showing a side view,
May be fixed to the bed 69 as shown by phantom lines,
It is also possible to install it directly at the place of placement. Further, the suction port 55 can be formed on the opposite side to the discharge port 56 as shown by a virtual line in addition to the position shown by a solid line.

The operation of this embodiment is basically the same as that of FIGS.

FIG. 13 is a simplified perspective view showing the parallel double pump P3 of FIGS. 10 to 12, and shows a structure in which four corners of the common casing 51 arranged in a laid-down state are supported by supporting legs 58. It is clearly represented.

[0038]

Fourth Embodiment FIGS. 14 and 15 show another example of a parallel type double pump P3 to which the invention according to the third aspect of the present invention is applied, wherein suction ports 55 are formed at three places of a common casing 51. FIG. Other structures are the same as those in FIGS. 10 to 12, the same components are denoted by the same reference numerals, and redundant description will be omitted.

In FIG. 14, which shows a longitudinal sectional front view, three suction ports 55 are provided at both ends in the longitudinal direction of the oval common casing 51 and on the lower surface at the center in the longitudinal direction. These three suction ports 55 can be used simultaneously, but it is also possible to select and use two or one as appropriate.

[0040]

Fifth Embodiment FIGS. 16 to 18 show a third embodiment of the present invention.
17 shows another example of the parallel-type double pump P3 to which the described invention is applied, in which both electric motor main shafts 66 are in a horizontal posture, and are vertically spaced at the same vertical plane as shown in a longitudinal front view of FIG. It is configured to line up. As the impeller 54, a pair of closed types is arranged.

As compared with the double pump P3 shown in FIGS. 14 and 15, the double pump P3 shown in FIGS.
Are different only in the arrangement posture and the mounting position of the support leg 58, and have the same basic structure. Therefore, FIG.
15 and the same parts as those in FIG. 15 are denoted by the same reference numerals.

The arrangement posture of the common casing 51 is shown in FIG.
17, the two electric motors 65 are changed to an upright posture in which the two electric motors 65 are vertically arranged on the same vertical plane with an interval therebetween, and the support leg 58 is connected to one end of the common casing 51 in the longitudinal direction (FIG. 17). (Lower end).

By changing the common casing 51 to the upright posture, the suction ports 55 formed at both ends in the longitudinal direction of the common casing 51 as shown in FIG. Suction port 55 formed in the part
Is open horizontally.

With such a structure in which the common casing 51 is arranged in the upright posture, the pump arrangement area can be further reduced.

FIG. 18 is a simplified perspective view showing the double pump P3 shown in FIGS. 16 and 17, and clearly shows a structure in which the lower end of the common casing 51 arranged in the upright posture is supported by the support legs 58. Represents.

[0046]

Sixth Embodiment FIGS. 19 to 21 show a third embodiment of the present invention.
Another example of the parallel type double pump P3 to which the described invention is applied, as shown in a horizontal sectional view of FIG. 19, in which both electric motor main shafts 66 are in a horizontal posture and are horizontally spaced at the same horizontal plane. It is configured to line up. As the impeller 54, a pair of closed types is arranged.

FIGS. 14 and 15 or FIGS. 16 and 1
19 and 20 in comparison with the parallel type double pump of FIG.
The basic structure of the double pump P3 is the same except for the arrangement posture and the mounting position of the support leg 58. Therefore, the same components as those in FIGS. 14 and 15 are denoted by the same reference numerals.

The arrangement posture of the common casing 51 is, for example, from the upright posture shown in FIG. 16 to the lower motor spindle O1.
By turning 90 ° around (in the direction of arrow S),
As shown in FIG. 20, the posture is changed to the horizontal posture, and the support legs 58 are replaced with the ends of the common casing 51 on the electric motor arrangement side.

By changing the posture of the common casing 51 to the horizontal posture as shown in FIG.
The first discharge port 56 faces upward, and the suction port 55 faces horizontal.

FIG. 21 is a simplified perspective view showing the parallel type double pump P3 of FIGS. 19 and 20, and clearly shows a structure in which the common casing 51 arranged in the horizontal position is supported by the support legs 58. Is represented in

[0051]

[Other Embodiments] (1) In the parallel type double pump P3 described with reference to FIGS. 14 to 21, an open impeller 70 can be applied as shown in FIG. In the open type impeller 70, the blade plate 71 on the common casing 51 side is formed separately from the impeller body portion having the blade, and faces the axial edge of the blade with a predetermined gap. .

A piston portion 73 is formed integrally with the blade plate 71 via a connecting portion 72, and each piston portion 73 is slidably fitted in a cylinder portion 77 formed in the common casing 51 in the axial direction. . On the other hand, the common casing 51
The inlet 76 of the centrifugal pump section is connected to the axis O1 of the motor main shaft 66.
, And is communicated with the suction port of the impeller 70 via the communication hole 75 of the connecting portion 72.

(2) FIGS. 23 and 24 show a state where the parallel type tandem pump P3 of FIGS. 14 and 15 is housed in an outdoor rain-proof box 80. A control panel 81 and a pressure tank 82 are also housed.

Since there is no need to provide piping between the pumps in the box 80, the single pump P shown in FIGS.
The box 80 can be made smaller than when two units 1 are stored,
Manufacturing costs can be reduced.

By the way, the front width W1 of the box 140 in FIG.
Is 100, the width W2 in FIG. 32 is 70, whereas the front width W3 in FIG. 23 is 72, and the width W4 in FIG.
Is 46, which is reduced to 47% when the volume of the box is multiplied by the front width and the width.

(3) FIG. 25 shows a tandem type double pump P
In this application example, two sets of tandem-type double pumps P2 shown in FIGS. 1 to 3 are installed on a common bed 85 so that a large amount of water can be supplied by operating three or four units. The discharge ports 20 are arranged to face each other and are connected by a T-shaped tube 86.

According to the structure of FIG. 25, as in the conventional example of FIG.
Since there is no need to collect four discharge ports as compared with the units installed in parallel, the structure of the discharge collecting pipe can be simplified, the cost can be reduced, and the arrangement space can be significantly reduced. In addition, a commercially available low-cost ready-made product can be used for the T-tube 86 itself.

(4) FIG. 26 shows an example in which two sets of the tandem type double pumps P2 shown in FIG. 4 are installed in one bed 88. The interval is narrowed, and both discharge ports 20 are connected by a bifurcated common discharge short pipe 90 at the upper part of the pump. A secondary common discharge port 91 is provided at the upper end of the common discharge pipe 90.
Are formed.

According to the structure of FIG. 26, since the discharge port 20 is connected at the upper part of the pump, the installation plane area can be reduced to, for example, about 74% as compared with the structure of FIG. When the facility construction cost such as the basic concrete is compared by the size of the bed, the cost of the bed L85 of FIG. 25 is 8 compared to the conventional length L3 of the bed 102 of FIG.
The length L9 of the bed 88 in FIG. 26 is further reduced to 1%, and is reduced to about 50%.

(5) FIG. 27 shows an example in which two sets of tandem type double pumps P2 are installed on one bed 89 as in FIG. 25, but the discharge port 20 of one tandem type pump P2 is provided.
To the suction port 24 of the other tandem pump P2,
The suction port 24 of the one tandem pump is placed in a water receiving tank,
The discharge port 20 of the other tandem pump P2 is connected to a water supply destination.

This makes it possible to provide an in-line pump unit very easily, and the length L10
Can be shortened as compared with FIG. In the case where pump units having four independent pumps P1 as shown in FIG. 33 are connected in series, all means for connecting the discharge port 105 of one pump P1 to the suction port 106 of the next pump P1 are used. 3
Although it needs to be performed at individual locations and requires considerable equipment and man-hours, the structure shown in FIG. 27 does not require any piping between the suction port 24 and the discharge port 20 and can greatly reduce the equipment and man-hours.

(6) The shaft seal between the main shaft of the electric motor and the volute casing is not limited to the mechanical seals 13 and 67, but may be a gland packing system.

(7) Although the support legs 16 and 58 are detachable, they can be formed integrally with the motor mounts 9 and 63 or the common casings 1 and 51.

[0064]

According to the tandem-type double pump according to the first aspect of the present invention, (1) the pump casings of the two centrifugal pumps are integrated and the impeller 4 is directly fixed to the electric motor main shaft 12; The number of parts can be reduced as compared with the case where two independent pumps are installed.

(2) A common casing 1 having openings 5 for mounting a motor at both ends in the axial direction is provided.
A pair of volute casings 8 are fixed therein, and the impellers 4 are respectively arranged in the respective volute casings 8 to constitute centrifugal pump sections, respectively. And the impeller 4 is directly fixed to the main shaft 12 of each electric motor 11, so that the axial dimension can be greatly reduced as compared with the conventional tandem type double pump of FIG.

(3) The common discharge port 20 and the common suction port 24 are formed in the cylindrical common casing 1 and communicate with the respective centrifugal pump parts.
The piping can be simplified as compared with the case where the table is installed, and the compactness can be achieved in this respect as well.

(4) Since the discharge port 24 is unified,
As compared with the structure of FIG. 34, piping for collecting the discharge ports is not required, and the manufacturing cost can be reduced. Even in the case of on-site construction, the number of piping
2 and the cost is further reduced.

(4) The tandem type double pump P2 is provided with support legs 16 on the motor mount 9 connected to the openings 5 at both ends of the common casing 1. By supporting the entire double pump, it is possible to easily install it in a predetermined place without using a common bed, even if a common bed is provided,
A long (L2) common bed 12 as in the conventional example of FIG.
Compared with the case of 0, a common bed 15 having a dimension L3 of about 1/4 as shown in FIG. As a result, the manufacturing cost can be greatly reduced, the foundation concrete for mounting can be small, and the required space can be reduced.

According to the parallel double pump using the common casing according to the third aspect of the present invention, (1) the pump casings 51 of the two centrifugal pump sections are integrated, and the impeller 40 is fixed directly to the electric motor main shaft 66. As a result, the number of parts can be reduced, dimensions can be reduced, manufacturing costs can be reduced, facility work can be facilitated, and facility work costs can be reduced as compared with the case where two conventional stand-alone pumps are installed. it can.

(2) Since the discharge port 24 is unified,
As compared with the structure of FIG. 34, piping for collecting the discharge ports is not required, and the manufacturing cost can be reduced. Even in the case of on-site construction, the number of piping
2 and the cost is further reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a tandem double pump to which the inventions according to claims 1 and 2 of the present application are applied, the tandem double pump having a closed impeller.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a side view of FIG. 1;

FIG. 4 is a side view showing a modification of the tandem type double pump of FIG. 1;

FIG. 5 is a plan view showing a state where the tandem type double pump of FIG. 1 is connected to a water receiving tank.

FIG. 6 is a side view of FIG. 5;

FIG. 7 is a longitudinal sectional view of a tandem double pump to which the invention of claim 1 and the present invention is applied, which is a tandem double pump provided with an open impeller.

8 is a sectional view taken along the line VIII-VIII in FIG.

FIG. 9 is an enlarged view of a portion indicated by an arrow IX in FIG. 8;

FIG. 10 is a longitudinal sectional view of a parallel double pump to which the invention according to claim 3 of the present application is applied, which is a parallel double pump having a closed impeller (XX sectional view of FIG. 11).

11 is a bottom view of FIG.

FIG. 12 is a side view of FIG.

FIG. 13 is a simplified perspective view of the parallel double pump of FIG. 10;

FIG. 14 is a longitudinal sectional view showing another example of the parallel double pump according to claim 3 of the present application, which is a parallel double pump having a closed impeller.

FIG. 15 is a bottom view of FIG.

FIG. 16 is a side view showing another example of the parallel double pump according to claim 3 of the present application.

17 is a sectional view taken along line XVII-XVII in FIG.

FIG. 18 is a simplified perspective view of the parallel double pump of FIG.

FIG. 19 is a horizontal sectional view showing another example of the parallel double pump according to the third embodiment of the present invention.

FIG. 20 is a side view (an arrow XX view) of FIG. 19;

FIG. 21 is a simplified perspective view of the parallel double pump of FIG. 19;

FIG. 22 is a sectional view of an open impeller applicable to the parallel double pump of FIGS. 10 to 21;

FIG. 23 is a front view showing a state where the tandem-type double pump of FIG. 1 is housed in a box for outdoor installation.

FIG. 24 is a side view of FIG. 23.

FIG. 25 is a plan view showing an example in which two sets of the tandem type double pump of FIG. 1 are installed on a common bed.

26 is a plan view showing an example in which two sets of the tandem type double pump of FIG. 4 are installed on a common bed.

FIG. 27 is a plan view showing an example in which two sets of the tandem type double pumps of FIG. 1 are installed on a common bed, in which discharge ports and suction ports of both pumps are directly connected.

FIG. 28 is a plan view showing a state where two conventional stand-alone pumps are used and connected to a water receiving tank.

FIG. 29 is a front view (XXIX arrow view) of FIG. 28;

30 is a view as viewed in the direction of the arrow XXX in FIG. 29.

FIG. 31 shows a conventional stand-alone pump mounted on a box for outdoor installation.
It is a front view showing the state where a table was stored.

FIG. 32 is a side view of FIG. 31.

FIG. 33 is a plan view showing a state in which four conventional stand-alone pumps are juxtaposed on a common bed.

FIG. 34 is a longitudinal sectional view of a conventional tandem type double pump.

FIG. 35 is a partial longitudinal sectional view of a conventional stand-alone pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Common casing 4 Closed impeller 8 Volute casing 9 Motor mount 11 Motor 12 Main shaft of motor 15 Bed 16 Support leg 19 Centrifugal pump part outlet 20 Common discharge port 24 Suction port 40 Open impeller 41 Blade plate 51 Common casing 53 Opening 54 Closed impeller 55 Suction port 56 Common discharge port 58 Support leg 62 Volute casing 63 Motor mount 65 Electric motor 66 Main shaft of electric motor 70 Open impeller 71 Impeller plate

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[Procedure amendment]

[Submission date] October 31, 2000 (2000.10.
31)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0067

[Correction method] Change

[Correction contents]

(4) Since the discharge port 20 is unified,
Compared with the structure of FIG. 28, the piping 103 for collecting the discharge ports is not required, and the manufacturing cost can be reduced. Also in the case of on-site construction, the number of pipes is reduced to し て も even if the size of the pipes is taken into account, further reducing costs.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name]

[Correction method] Change

[Correction contents]

According to the second aspect of the present invention, the tandem type double pump P2 is provided with a support leg 16 on a motor mount 9 connected to the openings 5 at both ends of the common casing 1. If you support the whole,
It can be easily installed in a predetermined place without using a common bed. Even if a common bed is provided, FIG.
As compared with the long (L2) common bed 120 as in the conventional example of FIG.
5 is enough. As a result, the manufacturing cost can be greatly reduced, the foundation concrete for mounting can be small, and the required space can be reduced.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0070

[Correction method] Change

[Correction contents]

(2) Since the discharge port 56 is unified,
Compared with the structure of FIG. 28, the piping 103 for collecting the discharge ports is not required, and the manufacturing cost can be reduced. Also in the case of on-site construction, the number of pipes is reduced to し て も even if the size of the pipes is taken into account, further reducing costs.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a tandem double pump to which the inventions according to claims 1 and 2 of the present application are applied, the tandem double pump having a closed impeller.

FIG. 2 is a sectional view taken along line II-II of FIG. 1 (partially omitted).

FIG. 3 is a side view of FIG. 1;

FIG. 4 is a side view showing a modification of the tandem type double pump of FIG. 1;

FIG. 5 is a plan view showing a state where the tandem type double pump of FIG. 1 is connected to a water receiving tank.

FIG. 6 is a side view of FIG. 5;

FIG. 7 is a longitudinal sectional view of a tandem double pump to which the invention of claim 1 and the present invention is applied, which is a tandem double pump provided with an open impeller.

8 is a sectional view taken along the line VIII-VIII of FIG. 7 (partially omitted).

FIG. 9 is an enlarged view of a portion indicated by an arrow IX in FIG. 8;

FIG. 10 is a longitudinal sectional view of a parallel double pump to which the invention according to claim 3 of the present application is applied, which is a parallel double pump having a closed impeller (XX sectional view of FIG. 11).

11 is a bottom view of FIG.

FIG. 12 is a side view of FIG.

FIG. 13 is a simplified perspective view of the parallel double pump of FIG. 10;

FIG. 14 is a longitudinal sectional view showing another example of the parallel double pump according to claim 3 of the present application, which is a parallel double pump having a closed impeller.

FIG. 15 is a bottom view of FIG.

FIG. 16 is a side view showing another example of the parallel double pump according to claim 3 of the present application.

17 is a sectional view taken along line XVII-XVII in FIG.

FIG. 18 is a simplified perspective view of the parallel double pump of FIG.

FIG. 19 is a horizontal sectional view showing another example of the parallel double pump according to the third embodiment of the present invention.

FIG. 20 is a side view (an arrow XX view) of FIG. 19;

FIG. 21 is a simplified perspective view of the parallel double pump of FIG. 19;

FIG. 22 is a sectional view of an open impeller applicable to the parallel double pump of FIGS. 10 to 21;

FIG. 23 is a front view showing a state where the tandem-type double pump of FIG. 1 is housed in a box for outdoor installation.

FIG. 24 is a side view of FIG. 23.

FIG. 25 is a plan view showing an example in which two sets of the tandem type double pump of FIG. 1 are installed on a common bed.

26 is a plan view showing an example in which two sets of the tandem type double pump of FIG. 4 are installed on a common bed.

FIG. 27 is a plan view showing an example in which two sets of the tandem type double pumps of FIG. 1 are installed on a common bed, in which discharge ports and suction ports of both pumps are directly connected.

FIG. 28 is a plan view showing a state where two conventional stand-alone pumps are used and connected to a water receiving tank.

FIG. 29 is a front view (XXIX arrow view) of FIG. 28;

30 is a view as viewed in the direction of the arrow XXX in FIG. 29.

FIG. 31 shows a conventional stand-alone pump mounted on a box for outdoor installation.
It is a front view showing the state where a table was stored.

FIG. 32 is a side view of FIG. 31.

FIG. 33 is a plan view showing a state in which four conventional stand-alone pumps are juxtaposed on a common bed.

FIG. 34 is a longitudinal sectional view of a conventional tandem type double pump.

FIG. 35 is a partial longitudinal sectional view of a conventional stand-alone pump.

[Description of Signs] 1 Common casing 4 Closed impeller 8 Volute casing 9 Motor mount 11 Electric motor 12 Main shaft of electric motor 15 Bed 16 Support leg 19 Centrifugal pump outlet 20 Common discharge port 24 Suction port 40 Open impeller 41 Blade Plate 51 Common casing 53 Opening 54 Closed impeller 55 Suction port 56 Common discharge port 58 Support leg 62 Volute casing 63 Motor mount 65 Electric motor 66 Main shaft of electric motor 70 Open impeller 71 Impeller plate

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 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takuji Niino 1-18-19 Komatsu, Higashiyodogawa-ku, Osaka-shi, Osaka Inside Mutual Pump Manufacturing Co., Ltd. (72) Inventor Toshio Yano 1513 Yoshida, Fujita-cho, Gobo-shi, Wakayama Of 1

Claims (3)

[Claims] 1. A common casing having a common discharge port and a common suction port on a cylindrical peripheral wall and having openings for mounting an electric motor at both ends in an axial direction, a pair of volute casings being fixed in the common casing, and By arranging the impellers in the volute casing respectively, the centrifugal pumps are respectively constituted, the outlets of the respective centrifugal pumps are gathered at the common discharge port, and the motors are connected to the openings via the respective motor mounts. A double pump in which the main shafts of the electric motors protrude into the corresponding volute casings, and the impellers are fixed directly to the main shafts of the electric motors. 2. The double pump according to claim 1, wherein the whole of the double pump is supported by support legs provided on the motor mount. 3. An oval common casing having a common discharge port and one or more suction ports, and having a pair of motor mounting openings arranged in parallel on one axial side wall,
By fixing a volute casing in each opening and disposing an impeller in each volute casing, respectively, a centrifugal pump section is formed, and an electric motor is connected to each opening via a motor mount, respectively. A double pump characterized in that the main shafts of the motors protrude into the corresponding volute casing bodies, and the impellers are directly fixed to the main shafts of the electric motors.