JP2000104695A - Peripheral pump and vertical shaft type self-suction system peripheral pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To vary a capability range as a swirl pump and to enhance self-suction capability. SOLUTION: A suction chamber 1d communicated with a suction opening 1f is provided in a casing body 1 at its lower part. A peripheral pump part 4 is placed on the suction chamber at its upper part. A discharge chamber 2d is provided in the peripheral pump part 4 at its upper part. A holding water chamber 1g communicated with an discharge opening 1h is provided outside the discharge chamber. As a peripheral casing 4b housing an impeller 4a and constituting the pump part 4, a plurality of peripheral casings having peripheral chamber with different effective lengths are prepared to selectively use an arbitrary peripheral casing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vortex pump capable of changing the specification of a pumping capability, and a vertical shaft type self-contained self-priming self-priming type vortex pump. The present invention relates to a suction vortex pump.

[0002]

2. Description of the Related Art A combination of an impeller and a vortex casing constituting a pump portion of a vortex pump is fixed, and the vortex casing employs a dedicated casting for the impeller, so that only a certain pumping performance can be obtained. However, it is difficult and inconvenient to flexibly respond to changing the pump specifications according to use conditions.

[0003] The vortex pump is characterized in that it has a small size and a high head can be obtained. The vortex pump generally has a small internal volume as compared with a vortex type or a diffuser type, and has a small amount of water for self-priming. For this reason, when the suction conditions are severe, such as when the suction lift is high and the piping path on the suction port side is long, the evacuation time is prolonged, the retained water tends to be overheated, and pumping may not be possible. In addition, if the water enters water in the shutoff operation state, it may overheat in a short time and cause many troubles such as damage to the pump, so it is suitable for equipment conditions as a means to avoid the shutoff operation state beforehand It was necessary to provide ancillary equipment such as an overheat prevention device.

[0004] Furthermore, since the pump section itself is small in size and has a structure of a horizontal shaft that is directly connected to a motor such as a motor, the pump section becomes large when including the motor and the coupling mechanism, and a large installation space is required. And it was inconvenient and uneconomical.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of these points, and enables a change in the capacity range of a vortex pump.
An object of the present invention is to improve the shape and structure of the entire pump device in order to significantly extend the allowable shut-off operation time and to reduce the installation space.

[0006]

According to a first aspect of the present invention, there is provided a swirl flow pump having a swirl chamber having a different effective length as a swirl casing having an impeller therein and constituting a pump section. A plurality of vortex casings provided respectively are prepared, and an arbitrary vortex casing can be selectively used. These multiple swirl casings include:
For example, at least one having a single effective vortex chamber and one having a short effective vortex chamber can be included. With such a configuration, the pump capacity can be changed by changing the effective length of the swirl chamber, and the pump capacity can be more finely adjusted by adjusting the length of the swirl chamber to be used.

According to a second aspect of the present invention, there is provided a vertical self-priming vortex pump.
A suction chamber communicating with the suction port is provided at a lower portion of the casing body, a vortex pump section is disposed above the suction chamber, a discharge chamber is provided above the vortex pump section, and a discharge port is provided outside the discharge chamber. There is a holding water chamber. With such a configuration, the amount of retained water that can be stored can be increased, the self-priming ability can be improved, and the installation space can be reduced due to the vertical shaft type.

This vertical shaft type self-priming vortex pump has a structure in which a casing body having an open upper surface and a pump unit for attaching and detaching the casing body from above are combined. The pump unit includes a casing cover and a casing cover. A support cylinder protruding from the lower surface of the center, a vortex pump disposed at a lower end of the support cylinder, an outer cylinder surrounding the outer circumference of the support cylinder, and a discharge chamber formed inside the outer cylinder. The impeller of the vortex pump unit is configured to be driven by a drive shaft vertically penetrating the center of the unit.

A plurality of vortex casings each having a vortex chamber having a different effective length are prepared as vortex casings constituting the vortex pump section, and any vortex casing can be selectively used. The plurality of vortex casings can include, for example, at least one having a single vortex chamber having a long effective length and one having two vortex chambers having a short effective length. With such a configuration, the pump capacity can be changed by changing the effective length of the swirl chamber, and the pump capacity can be more finely adjusted by adjusting the length of the swirl chamber to be used.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments shown in the drawings will be described below. In this embodiment, the first invention is applied to a vortex pump portion of a vertical-shaft self-priming vortex pump according to a second invention. FIG. 1 is an overall sectional view, and FIG. It is the exploded side view shown. In the figure, 1 is a casing body having an open upper surface, 2 is a pump unit for attaching and detaching the casing body 1 from above, 3 is a motor unit,
Reference numeral 4 denotes a vortex pump part included in the pump unit 2,
The vertical axis type self-priming vortex pump according to the present invention comprises a pump P
Has a pull-out type structure in which a pump unit 2 is inserted into a casing body 1 from above, and a motor unit 3 is further mounted thereon to be integrated therewith. The motor unit 3 has a motor 3b mounted on a motor frame 3a.

The casing main body 1 is a bottomed cylindrical body having a flat mirror plate-shaped bottom, and has a mounting hole 1a formed in the upper inner edge, and a flange-shaped partition shelf slightly above the bottom of the inner peripheral wall. 1b is formed, and a unit receiving hole 1c slightly smaller in diameter than the mounting hole 1a is formed in the inner edge thereof. Partition shelf 1
In the lower part of b, the entire area is a suction chamber 1d, and a partition 1b
Suction channel 1 formed vertically through part of
e, and communicates with a suction port 1f provided at an upper portion.
The upper part of the partition shelf 1b is located outside the pump unit 2 and serves as a holding water chamber 1g, and communicates with a discharge port 1h provided at the same height as the suction port 1f.

In the drawing, the suction port 1f and the discharge port 1h are provided symmetrically with respect to the central axis at an interval of 180 °, but they may be arranged at intervals of 90 °, for example. Can be selected. Reference numeral 1j denotes a base plate fixed to the bottom surface of the casing body 1 and supporting the entire pump P, and can be installed on a base. 1k
Is a drain hole provided at the bottom.

The pump unit 2 includes a casing cover 2a whose lower surface fits into the mounting hole 1a when inserted into the casing body 1, a support cylinder 2b protruding from the lower surface of the casing cover 2a, and a support cylinder 2b. It comprises a vortex pump section 4 arranged at the lower end and an outer cylinder 2c surrounding the outer periphery of the support barrel 2b. A cylindrical discharge chamber 2d is formed between the outer cylinder 2c and the support body 2b, and a plurality of communication holes 2e having a smaller diameter than the discharge port 1h are provided at the top of the outer cylinder 2c.
The total opening area of these communication holes 2e is larger than the opening area of the discharge port 1h. Reference numeral 2f denotes a drive shaft which penetrates the center of the pump unit 2 in the vertical direction and is supported by the upper bearing unit 2g and the lower bearing 2h. The impeller 4a of the vortex pump unit 4 is fixed to the lower part by a nut 2j. Shaft coupling 3c
To the motor 3b. 2k is a mechanical seal.

The support cylinder 2b supports the swirl casing 4b of the swirl pump section 4 and has strength and dimensions for properly maintaining the distance and positional relationship with the impeller 4a. The support cylinder 2b is fixed to the casing cover 2a with bolts. The vortex casing 4b is fixed to the lower end with bolts, and the outer cylinder 2c is mounted between the casing cover 2a and the vortex casing 4b using the lower surface of the casing cover 2a and the step of the vortex casing 4b. When the pump unit 2 is inserted into the casing main body 1, the lower outer periphery of the swirl casing 4 b of the swirl pump unit 4 is fixed to the unit receiving hole 1 of the casing main body 1.
It slides on c and fits.

As shown in FIG. 1, a return water hole 4k penetrating from the outer periphery to the lower surface is provided in the lower portion of the vortex casing 4b. This return water hole 4k is for returning a small amount of water from the holding water chamber 1g to the suction chamber 1d, and recirculating water necessary for the self-priming action is supplied to the vortex pump unit 4, and the water supply capacity is not significantly reduced. It is formed with dimensions, for example, an inner diameter of about 3 mm. The lower bearing 2h is fixed so as to protrude from the lower surface of the vortex casing 4b, and is submerged in the water of the suction chamber 1d together with the tip of the drive shaft 2f.

The swirl casing 4b, which includes the impeller 4a and constitutes the swirl pump section 4, is a wheel-cut type having a central portion vertically and horizontally divided into two, as shown in FIGS. 3 (a) and 3 (b). As described above, the upper member 4U and the lower member 4D are concentrically integrated with each other by fitting a hard stamped cage, and are integrated and fastened with bolts (not shown). A concave groove 4c is provided on the outer periphery of the lower member 4D, and an O-ring 4d is fitted therein.
c to maintain airtightness. The inner surface of the vortex casing 4b, that is, the lower surface of the upper member 4U and the lower member 4D
A circular concave portion 4e corresponding to the impeller 4a is formed on the upper surface of the impeller 4a, and further has an arc shape concentric with the impeller 4a,
When the upper member 4U and the lower member 4D are integrated, the impeller 4
The swirl chamber 4f is formed so as to have a cross-sectional shape surrounding the outer peripheral portion and the upper and lower portions thereof.

The swirl chamber 4f is formed on the inner surface of the swirl casing 4b in correspondence with the impeller 4a. Two strips are formed so as to have a right-angled arrangement. 3A and 4A show examples in which a single vortex chamber 4f having a long effective length is provided in a C-shape along the circumference, and FIGS. Swirl chamber 4f
Are provided in the shape of a letter along the circumference, respectively.

In any case, the swirl chamber 4 on the lower member 4D side
A suction port 4g penetrating vertically is formed at the start end of f, and a discharge port 4h penetrating vertically is formed at the end of the swirl chamber 4e on the upper member 4U side, and the end between the end and the start end of the adjacent swirl chamber 4e is formed. The swirl chamber, the suction port, or the discharge port are not formed, and the separation part 4j separates the terminal end from the start end. 4A and 4B, L indicates the effective length of the vortex chamber 4f, and K indicates the isolation length of the isolation part 4j. When assembled as a pump, the suction port 4
g is open to the suction chamber 1d, and the discharge port 4h is connected to the discharge chamber 2d.
It will be opened to.

The vortex casing 4b has the structure described above. The discharge pressure increases as the effective length L of the vortex chamber 4f increases, and the discharge rate increases as the cross-sectional area of the vortex chamber 4f increases. If a vortex casing 4b provided with a long vortex chamber 4f having a long effective length L is used as shown in (a), the discharge pressure increases, and a vortex flow provided with a short vortex chamber 4f having a short effective length L shown in FIG. If the casing 4b is used, the discharge amount increases. Further, the discharge pressure and the discharge amount can be finely adjusted by changing the processing position of the suction port 4g and the discharge port 4h or the cross-sectional area of the vortex chamber 4f.

FIGS. 5 (a) and 5 (b) show a single vortex chamber 4f and two vortex chambers 4f, respectively, as in FIGS. 4 (a) and 4 (b). The case where the effective length L is shorter and the isolation length K is longer than in the example is shown. As described above, several types of swirl casings 4b having different dimensions of the swirl chamber 4f are prepared, and the swirl pump unit 4 is configured using the necessary swirl casing 4b according to specifications required at the time of assembly. Thus, the pump specifications can be changed while using the same impeller 4a.

The structure of the vortex casing 4b as described above is not limited to the vertical shaft type self-priming pump as shown in the figure.
The present invention can be applied to all vortex pumps, such as a conventional horizontal axis type pump.

The illustrated pump P is configured as described above, and operates as follows. First, when priming is required, water is supplied from a discharge pipe side (not shown), and priming is performed at a height up to the lower surface of the suction port 1f. When started in this state, the water in the suction chamber 1d is sucked into the vortex pump unit 4 from the suction port 4g, and flows into the discharge chamber 2d from the discharge port 4h. If the operation is continued in this state, the inside of the suction passage 1e becomes empty, a negative pressure is generated in the suction chamber 1d from the suction port 1f via the suction passage 1e, and the water level in the suction pipe (not shown) gradually rises.

When the operation is further continued, a small amount of water flows from the holding water chamber 1g through the return water hole 4k into the suction chamber 1d,
The water and the air are sucked by the vortex pump unit 4. Then, while swirling in the swirl chamber 4f, it enters a mixed state of air and water, flows into the discharge chamber 2d, is almost separated from the water by the time it reaches the uppermost communication hole 2e, flows into the retained water chamber 1g, and further flows into the water chamber. As the separation proceeds, only water returns and returns to the suction chamber 1d through the water hole 4k.
Therefore, this water becomes replenishment water in which no air is mixed, and while the above self-priming action is continued, the air in the holding water chamber 1g is discharged to the discharge pipe, and the water that has continued to rise in the suction pipe is sucked. The chamber 1d is further filled with the discharge chamber 2d and the holding water chamber 1g.

The normal water supply operation is performed in this manner. The discharge pressure and discharge amount obtained by this water supply operation depend on the vortex casing 4b used as described above.
Of the vortex chamber 4f. Therefore, several kinds of swirl casings 4b having different dimensions of the swirl chamber 4f are prepared,
By configuring the vortex pump unit 4 using required components, the pump specifications can be changed while using the same impeller 4a.

When the operation is stopped during normal water supply, backflow from the discharge side to the suction side starts, and the interior of the suction chamber 1d and the like tends to be emptied by water falling due to the siphon action, but air is sucked from the suction flow path 1e. It passes through the upper part of the chamber 1d, further reaches the uppermost part of the discharge chamber 2d through the vortex pump part 4, and has a communication hole 2e.
When the water reaches the uppermost part of the adjacent holding water chamber 1g, vacuum break occurs, and the water drop stops in a state where a large amount of water remains in most of the holding water chamber 1g. Thereafter, the gap created in the ceiling of the suction chamber 1d is immediately filled with natural water falling from the return water hole 4k, and the vortex pump part 4 and the discharge port 4 are drawn from the suction port 4g.
When the water level that has entered the discharge chamber 2d from below through h and the water level of the holding water chamber 1g are stable, the water drop from the water hole 4k stops.

Therefore, the residual water is secured at a high water level, and the self-priming operation water necessary for restarting is sufficiently retained. At the restart, self-priming is performed before the large amount of retained water is overheated. After the evacuation of the operation is completed, the water supply is started. That is, overheating of the retained water is eliminated, and stable water supply can be smoothly continued.

[0027]

As is apparent from the above description, the vortex pump according to the first aspect of the present invention has a plurality of vortex chambers each having a different effective length as a vortex casing having an impeller therein and constituting a pump section. Prepare a vortex casing,
Since an arbitrary swirl casing can be selectively used, the pump length can be changed by changing the effective length of the swirl chamber. Therefore, it is easy to flexibly respond, for example, changing the pump specifications according to the use conditions, and the management of production, inventory, maintenance work, and the like is simplified.

According to a second aspect of the present invention, there is provided a vertical axis type self-priming vortex pump, wherein a suction chamber communicating with a suction port is provided at a lower portion of a casing body, and a vortex pump section is disposed above the suction chamber. A discharge chamber is provided in the upper part, and a water holding chamber communicating with the discharge port is provided outside the discharge chamber. Therefore, it is easy to increase the internal volume of the casing body, and since the suction chamber, the discharge chamber, and the holding water chamber are rationally arranged, it is possible to increase the amount of holding water that can be stored. The self-priming function at start-up can be performed reliably, and the amount of water retained is large, making it difficult to overheat.This enables long-time shut-off operation and eliminates the need for a device to prevent overheating. Therefore, the installation space can be reduced, which is economical.

Further, a pump unit for attaching and detaching the pump unit to and from a casing body having an open upper surface is provided with a casing cover, a support cylinder protruding from a central lower surface of the casing cover, and an eddy current arranged at a lower end of the support cylinder. A pump unit, an outer cylinder surrounding the outer periphery of the support cylinder, and a discharge chamber formed inside the outer cylinder, wherein the impeller of the vortex pump unit is driven by a drive shaft vertically penetrating the center of the pump unit. The vertical axis self-priming vortex pump as described above can be easily configured.

A plurality of vortex casings having vortex chambers having different effective lengths are prepared as vortex casings constituting the vortex pump section, and any vortex casings can be selectively used. The pump capacity can be changed by changing the effective length of the swirl chamber. Therefore, it is easy to flexibly respond, for example, changing the pump specifications according to the use conditions, and the management of production, inventory, maintenance work, and the like is simplified.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pump according to an embodiment of the present invention.

FIG. 2 is an exploded side view showing a cross section of a part of the pump.

FIG. 3 is a sectional view of a vortex casing in the pump.

FIG. 4 is a plan view of the vortex casing on the side where a vortex chamber is provided.

FIG. 5 is a plan view of another example of the vortex casing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing main body 1d Suction chamber 1f Suction port 1g Holding water chamber 1h Discharge port 2 Pump unit 2a Casing cover 2b Support cylinder 2c Outer cylinder 2d Discharge chamber 2f Drive shaft 3 Motor unit 4 Eddy current pump part 4a Impeller 4b Eddy current casing 4f Eddy current chamber 4j Separation part 4U Upper member 4D Lower member P Vertical axis self-priming vortex pump L Effective length K Isolation length

Claims (6)

[Claims] A plurality of swirl casings each having a swirl chamber having a different effective length are prepared as a swirl casing forming a pump section with an impeller therein, and an arbitrary swirl casing can be selectively used. Swirl pump characterized by being made. 2. The vortex casing includes at least a vortex casing having one long vortex chamber with a long effective length and a vortex casing having two vortex chambers with a short effective length. A vortex pump as described. 3. A vertical shaft type, wherein a suction chamber communicating with a suction port is provided at a lower portion of a casing body, and a vortex pump section is disposed above the suction chamber and a discharge chamber is formed above the vortex pump section. A vertical axis type self-priming vortex pump, wherein a water chamber is provided outside the discharge chamber and communicates with the discharge port. 4. A structure in which a casing main body having an open upper surface is combined with a pump unit for attaching and detaching the casing main body from above, wherein the pump unit is provided on a casing cover and protrudingly provided at a central lower surface of the casing cover. A support cylinder, a vortex pump portion disposed at the lower end of the support cylinder, an outer cylinder surrounding the outer circumference of the support cylinder, and a discharge chamber formed inside the outer cylinder, and the center of the pump unit is arranged in a vertical direction. 4. The vertical-shaft self-priming vortex pump according to claim 3, wherein the impeller of the vortex pump section is driven by a driving shaft penetrating therethrough. 5. A swirl casing comprising a swirl chamber having a different effective length is provided as a swirl casing constituting the swirl pump unit, and an arbitrary swirl casing can be selectively used. Or the vertical axis type self-priming vortex pump according to 4. 6. The vortex casing includes at least one having a long vortex chamber with a long effective length and one having two vortex chambers with a short effective length. Vertical shaft self-priming vortex pump as described.