JPH1193884A - Manufacture of vortex type pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change a foreign matter passing rate of a pump regulated by an interval between an impeller blade end surface and a pump casing bottom surface by dislocating a relative position of an impeller and a pump casing by using an intermediate casing different in a connecting length in the shaft direction. SOLUTION: In the constitution that a pump casing 71 is connected to the lower side of an intermediate casing 72a, a connecting length L1 with the pump casing 71 in the shaft direction of the intermediate casing 72a is set so that the ratio (D1 /D0 ) of an interval D1 (a maximum passing diameter) between a blade end surface of an impeller 70 to a diamter D0 (a pump delivery diameter) of a delivery port 71a becomes a desired foreign matter passing rate. That is, a different foreign matter passing rate can be obtained by optionally changing the connecting length L1 with the pump casing 71 in the shaft direction of the intermediate casing 72a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vortex pump used, for example, for supplying sewage in a water treatment apparatus, and more particularly to a method of manufacturing a vortex pump capable of easily manufacturing pumps having different foreign object passage rates. It is about.

[0002]

2. Description of the Related Art Vortex type pumps are widely used as sewage / filtration pumps because there is a large gap between the blade tip surface of the impeller and the bottom of the casing and there is little occurrence of blockage accidents in the pump due to foreign matter. in use. Various pumps having different ratios of the maximum diameter of foreign matter that can pass through the inside of the pump to the pump discharge port diameter (foreign matter passing rate) are manufactured and used depending on the application. Here, the maximum diameter of the foreign matter that can pass through the inside of the pump is determined by the distance between the blade tip surface of the impeller and the casing bottom surface.

FIG. 3 shows a general structure of a conventional vortex pump designed to have the foreign matter passing rate of 100%.
FIG. 4 shows the general configuration of a conventional vortex pump, also designed at 70%. These are integrally provided with a motor unit 2 for driving the main shaft 1 and a pump unit 3 for pumping water by the rotation of the main shaft 1. The pump unit 3 is designed to prevent the pressure water of the pump unit 3 from leaking to the motor unit 2 side. The shaft between the motor unit 2 and the motor unit 2 is sealed with a mechanical seal 4.

Here, in the pump section 3 of the vortex pump shown in FIG. 3, a vortex impeller 20 is connected to the lower end of the main shaft 1, and the impeller 20 has a discharge port 21a and a suction port 21b. Pump casing 21 having
The construction is such that water from the construction site is sucked in from below and discharged from the side. The impeller 20 and the pump casing 21 are used in such a shape that the foreign matter passage rate becomes 100%.

On the other hand, in a pump section 3 of a vortex pump shown in FIG. 4, a vortex impeller 30 is connected to a lower end of the main shaft 1, and the impeller 30 has a discharge port 31a and a suction port 31b. The pump casing 31 is watertightly covered. The impeller 30 and the pump casing 31 are used in a shape having a foreign matter passing rate of 70%. In other words, the pumps shown in FIGS. 3 and 4 can obtain a desired foreign matter passing rate by using the impellers 20 and 30 and the pump casings 21 and 31 having different shapes, respectively.

In the motor section 2, a rotor 5 rotating integrally with the main shaft 1 and a stator 7 around which a stator winding 6 is wound are housed in a motor chamber 8. An upper portion of the motor room 8 has an inlet for the underwater cable 10 and accommodates equipment such as a protector (heating protection device) 11 for preventing burning of the motor portion due to overcurrent or open-phase operation, and an operation capacitor. An equipment room 12 is provided. Here, the motor chamber 8 and the equipment chamber 12 are watertightly surrounded by a substantially cylindrical motor frame 13 opened upward and a motor cover 14 connected to the upper end of the motor frame 13, and a bracket 15 It is divided up and down.

The main shaft 1 is connected to the bracket 1
5 is rotatably supported by an upper bearing 16 attached to the lower surface and a lower bearing 17 attached to the inner peripheral surface of the motor frame 13. Further, on the upper surface of the motor cover 14,
A handle 18 for suspending or moving to a spring site is provided.

In the vortex pump shown in FIG. 3, a pump stand 22 for allowing the pump to stand on its own is mounted on a pump casing 21.
The discharge curved pipe 2 is connected to the discharge port 21a of the pump casing 21.
3 are connected. In the vortex pump shown in FIG. 4, a pump stand 32 for attaching the pump to itself is attached to a pump casing 31.

The mechanical seal 4 includes an intermediate casing 40 connecting the motor frame 13 and the pump casing 21 (FIG. 3) or the pump casing 31 (FIG. 4), and a mechanical seal chamber 41 partitioned by the motor frame 13. Is located within. In this shaft seal,
Oil for lubricating and cooling the sliding surface of the mechanical seal is sealed.

[0010]

However, when different types of impellers or pump casings are used for different models having different foreign object passage rates as in the above-mentioned conventional example, different types of wooden molds or pumps are used for different product types. It is necessary to prepare a manufacturing jig, which not only increases the initial investment for manufacturing the pump, but also increases the number of parts, which is not preferable in terms of inventory management.

As shown in FIG. 5, by mounting the suction cover 51 constituting a part of the pump casing 50 in a direction opposite to the pump shaft, different foreign object passing rates are realized. There has been proposed one in which basic components can be shared. However, if the foreign matter passage rate is changed on the front and back of the suction cover as described above,
In applications that require a large foreign matter passage rate, the suction cover must be designed large, which is considered to be wasteful and impractical.

The present invention has been made in view of the above circumstances, and provides a method for manufacturing a vortex pump in which pumps having different foreign object passage rates can be easily manufactured using impellers and pump casings having the same shape. The purpose is to provide.

[0013]

A method of manufacturing a vortex pump according to the present invention is directed to a vortex pump having an intermediate casing, wherein a pump casing containing an impeller is connected to a lower end of the intermediate casing. In the manufacturing method, the pump casing and the impeller are used as common parts, and the intermediate casing having a different connection length with the pump casing along the axial direction is used. The relative position is changed.

Thus, even if the impeller and the pump casing having the same shape are used, the relative positions of the pump casing and the impeller can be determined by using the intermediate casing having a different connection length with the pump casing along the axial direction. Stagger,
It is possible to change the maximum diameter of the foreign matter that can pass, which is defined by the distance between the end face of the impeller blade and the bottom face of the pump casing, that is, the foreign matter passing rate of the pump. This makes it possible to manufacture a pump having an arbitrary foreign matter passage rate at a short delivery time and at low cost by changing only the connection length of the intermediate casing while using at least the pump casing and the impeller as common parts.

[0015]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. Note that FIG. 3 and FIG.
The same parts as in the conventional example shown in FIG.

This embodiment uses a bracket 15 (FIG. 3).
4), the upper bearing 16 is connected to the motor cover 14, and the load-side bracket 60 is connected to the lower end of the motor frame 13.
An example is shown in which a lower bearing 17 is attached to each of the motors 2 and the pump section 3 is further double-sealed with an upper mechanical seal 4a and a lower mechanical seal 4b. Here, FIG. 1 shows an example in which the foreign matter passage rate is 100%, and FIG. 2 shows an example in which the foreign matter passage rate is also 70%. In this embodiment, the intermediate casing 7
Except for 2a and 72b, all other parts are common.

In the pump section 3 of the vortex pump shown in FIG. 1, a vortex impeller 70 is connected to the lower end of the main shaft 1. The impeller 70 is covered in a watertight manner with a pump casing 71 having a pump stand 73 suspended therefrom. The pump casing 71 has a discharge port 71a and a suction port 71b, and sucks spring water or the like at a construction site from below. It discharges from the side. Then, depending on the relative position of the pump casing 71 and the impeller 70 in the axial direction, the foreign matter passing rate becomes 100%.
It is configured to keep a proper distance (maximum free passage diameter) D ₁ between the blade edge and the casing bottom of the impeller.

That is, in the vortex pump shown in FIG. 1, the pump casing 71 is connected to the lower end of the intermediate casing 72a. Then, the intermediate casing 72
a indicates that the connection length L ₁ between the pump casing 71 and the pump casing 71 along the axial direction is equal to the blade end face of the impeller 70 and the pump casing 7.
The ratio (D ₁ / D ₀ ) of the distance D ₁ (maximum passage diameter) between the bottom surfaces of the ₁ and the diameter D ₀ (pump discharge diameter) of the discharge port 71a is 100.
% Is set.

On the other hand, the pump section 3 of the vortex pump shown in FIG. 2 uses a vortex impeller 70 and a pump casing 71 having the same shapes as those used in the vortex pump shown in FIG. Have been. However, the use of the intermediate casing 72b of different connecting elongated L _2, the axial relative position between the pump casing 71 and the impeller 70 is changed, the foreign matter passing ratio is configured to be 70% . That is, in the vortex pump shown in FIG. 2, the pump casing 71 is connected to the lower end of the intermediate casing 72b. Then, the intermediate casing 72b is connected length L ₂ of the pump casing 71 along its axial direction, the distance D ₂ between the bottom surface of the blade tip surface and the pump casing 71 of the impeller 70 (the maximum free passage diameter) ejection The ratio (D ₂ / D ₀ ) to the diameter D _{0 of the} outlet 71 a (pump discharge port diameter) is set to be 70%.

In other words, the connection length L ₁ along the axial direction of the intermediate casing 72a of the pump shown in FIG.
Longer than the coupling length L ₂ along the axial direction of the intermediate casing 72b of the pump shown in (L _1> L ₂₎ is set. Accordingly, when other conditions such as the length of the main shaft 1 and the mounting position of the impeller 70 on the main shaft 1 are made the same, the distance between the blade end surface of the impeller 70 and the bottom surface of the pump casing 71 shown in FIG. towards D ₁ is longer than the distance D ₂ between the bottom surface of the blade tip surface and the pump casing 71 of the impeller 70 shown in FIG. 2 (D _1>
D ₂ ).

As a result, in this embodiment,
Impeller 70 and pump casing 71 having the same shape and dimensions
Can be used to construct two types of vortex pumps having a foreign matter passage rate of 100% and 70%.

By arbitrarily changing the connection length of the intermediate casing with the pump casing along the axial direction,
Needless to say, vortex pumps having different foreign object passage rates can be easily configured.

[0023]

As described above, according to the present invention, components such as the pump casing and the impeller are shared,
By using an intermediate casing having a different coupling length along the axial direction, the relative position between the impeller and the pump casing is shifted, and the foreign matter passing rate of the pump defined by the distance between the end face of the impeller blade and the bottom of the pump casing is reduced. Can be changed.
As a result, the impeller and the pump casing can be shared between products having different foreign object passage rates, and the initial investment related to pump production, such as a wooden mold and a manufacturing jig, can be reduced, and the number of parts can be reduced. Therefore, convenience in inventory management can be achieved.

[Brief description of the drawings]

FIG. 1 shows that a foreign matter passage rate according to an embodiment of the present invention is 10%.
FIG. 2 is a vertical sectional front view of a vortex pump set to 0%.

FIG. 2 is a vertical sectional front view showing a main part of a vortex pump in which a foreign matter passage rate is 70%.

FIG. 3 is a vertical sectional front view showing a conventional vortex pump designed to have a foreign matter passage rate of 100%.

FIG. 4 is a vertical sectional front view showing a vortex pump designed to have a foreign matter passage rate of 70%.

FIG. 5 is a sectional view of a main part showing a main part of another conventional example.

[Explanation of symbols]

1 spindle 2 motor unit 3 the pump unit 5 rotor 7 stator 60 load-side bracket 70 impeller 71 pump casing 72a, 72b intermediate casing L _1, L ₂ connecting elongated along the axial direction of the intermediate casing D ₀ pump discharge diameter D _1, D ₂ impeller blade edge and spacing of the bottom surface of the pump casing (maximum passage diameter)

Claims (1)

[Claims] 1. A method of manufacturing a vortex pump comprising an intermediate casing and connecting a pump casing containing an impeller therein to a lower end of the intermediate casing, wherein the pump casing and the impeller are common parts, A vortex type wherein the axial casing has a different connection length between the pump casing and the pump casing along the axial direction, and the relative position in the axial direction between the pump casing and the impeller is changed. Pump manufacturing method.