JP3355296B2 - Swirl type pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vortex type pump generally used as a high-head water flow type pump in a domestic shallow well pump.

[0002]

2. Description of the Related Art A conventional vortex pump will be described with reference to FIGS.

[0003] The pump section of the vortex pump includes a motor 5, a casing 12, an impeller 28, a casing cover 31, and a shaft sealing device 51.

The casing 12 has a suction channel 12a, a discharge channel 12b, a partition 12c, a water channel 12d, and a liner 12e.

The depth of the water flow passage 12d is set so as to gradually become shallower from the suction side as shown in FIGS. 10 and 11 (expanded cross-sectional views of dotted portions in FIG. 10) for improving pump efficiency. ing.

That is, from the depth tb at the point b to the depth t at the point h
The dimension is set so that it gradually becomes shallow at h.

A pocket 12f is formed on the suction side of the water flow passage 12d to prevent a sudden change in the cross-sectional area of the water flow passage from the suction flow passage 12a in order to prevent cavitation at a high suction height.

Further, since the water in the water flow path 12d is moved at a high speed, the surface of the water flow path 12d needs to be smooth, and is generally formed by three-dimensional machining.

Next, the principle of operation will be briefly described. The water discharged from the groove 28a into the water flow path 12d by the rotation of the impeller 28 exchanges the momentum with the water in the water flow path 12d, and then re-exchanges. It flows into the root of the groove 28a.

[0010] Such an operation is repeated in each groove 28a, and water is discharged through a spiral path to generate high pressure.

That is, the point b in FIG. 10 has the lowest pressure, and the point i has the highest pressure.

Therefore, a pressure difference is generated in the water flow passage 12d, and water leaks from the high pressure side to the low pressure side through the gap between the partition wall portion 12c, the liner portion 12e, and the liner portion 31e.

If the leakage is large, the pump characteristics are deteriorated, so that the impeller 28, the partition 12c and the liner 12
e, the gap of the liner portion 31e is set to be as small as possible in terms of work and assembly.

By the way, conventionally, when manufacturing a plurality of models of vortex pumps having different pump characteristics, the casing 12 and the casing cover 31 are required for each model.

Further, as described above, if there is much leakage of water from the high pressure side to the low pressure side, the pump characteristics deteriorate. Therefore, the gap between the impeller 28 and the partition wall portion 12c, the liner portion 12e, and the liner portion 31e is Although it is set as small as possible in terms of machining and assembling, due to the minimal gap, if the pump is left unused and corrosion proceeds, the impeller 28 and the casing 12 or the impeller 28 and the casing There is a possibility that the gap between the covers 31 is fixed and the impeller 12 is locked.

In order to avoid the lock of the impeller 28, it is conceivable that the vortex pump is made of a corrosion-resistant material. In general, a copper alloy is used in consideration of precision machining. ing.

However, in the conventional vortex pump,
In particular, the suction channel 12a, the discharge channel 12b, the water channel 12d, and the housing 12g of the shaft sealing device 51, which do not need to be formed of a corrosion-resistant material, are also formed of a copper alloy.
There is a problem that the pump becomes expensive.

Conventional examples related to this kind of technology are disclosed in, for example, JP-A-6-288380 and JP-A-59-21.
No. 1792 and the like.

However, according to the technique described in JP-A-6-288380, when the shape of the water flow passage 12d is complicated, a considerable amount of labor is required for machining and the effect of reducing the cost of the pump is small.

On the other hand, according to the technique disclosed in Japanese Patent Application Laid-Open No. Sho 59-211792, the effect of reducing the cost of the pump is great, but since all are made of synthetic resin, the problem of poor strength remains. .

[0021]

SUMMARY OF THE INVENTION A first object of the present invention is to provide an inexpensive vortex pump which can easily cope with models having different pump characteristics.

A second problem to be solved by the present invention is as follows.
It is an object of the present invention to provide an inexpensive vortex-type pump capable of easily supporting models having different pump characteristics while maintaining pump performance and quality.

[0023]

The first object, according to an aspect of the and the impeller configured vanes by forming a number of grooves on the outer periphery both sides are directly connected to the motor, cormorants water flow path covering the blade,
A suction channel and a discharge channel that are communicated with the water flow channel, a partition wall that separates the suction channel and the discharge channel, and a casing that includes a liner portion facing a portion excluding a blade portion of an impeller; , casing water flow path substantially symmetrical shape water flow path of
In vortex pump comprising a casing cover configured from the liner portion facing the impeller, the both of the casing and the casing cover, respectively, the liner plate liner portion and the partition wall portion is formed, the water flow path is formed and the ring plates, be those liner plate and the ring plate is constituted by three members of the main body cylindrical storage chamber is formed to be accommodated, before
The liner plate and the ring plate are
Exchangeable according to the size of the impeller incorporated in the pump
The main body is achieved by making the impeller common to impellers having different sizes .

The vortex type pump configured as described above has the following features.
After storing the ring plate in which the specific shape of the water flow path is set by the pump characteristics in the storage chamber of the main body, the liner plate is pressed into the main body to prevent the ring plate from floating, and the partition is pressed after the liner plate is pressed. Precise machining of the section and liner ensures a proper gap with the impeller.

According to the above-described structure, when a plurality of types of vortex pumps having different pump characteristics are manufactured, unlike the related art, a casing and a casing cover are not necessarily required for each model. By simply replacing the ring plate and the liner plate that match the requirements, the main body can be made of the same parts and can be used with models having different pump characteristics, and an inexpensive vortex pump can be provided.

The second problem is that, in addition to the first structure, the main body is made of cast iron, the ring plate is made of synthetic resin, and the liner plate is made of a corrosion-resistant material such as copper alloy or stainless steel. Is achieved by

According to the second configuration, the casing and the casing cover are composed of members corresponding to the functions of the respective parts, so that the pump performance and quality are maintained and the eddy current type is less expensive than the conventional one. A pump can be provided.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows the overall structure of a vortex pump.
FIG. 5 is a sectional view taken along the line BP-D in FIG. 4.

A ball bearing 5 is provided in an inexpensive cast iron casing 8 integrated with the end bracket of the motor 5.
A copper alloy impeller 28 having good corrosion resistance and excellent precision machinability is fixed to the rotating shaft 5a held by 6 via a shaft sealing device 51, and is rotatably housed.

The casing 8 is formed with a suction flow channel 8a and a discharge flow channel 8b shown in FIG. 4, a storage chamber 8c shown in FIG. 1 which communicates with these, and a cylindrical fixing portion 8p.

In the storage chamber 8c, a ring plate C (here, C indicates the casing 8 side; the same applies hereinafter) 72 shown in FIG. 2 and a liner plate C71 shown in FIG. a symmetrical shape with ring plate C72 ring plate CV (Note that the CV,. hereinafter the same indicating that the casing cover 9 side) and 82, liner plate CV81 having a substantially same shape as the liner plate C71 is casing It is stored in the storage room 9c of the cover 9.

The casing cover 9 is fixed to the casing 8 via an O-ring 20.

Ring plate C72 and ring plate C
The outer peripheral portion of the V82 is in contact with the fixed state.

The liner plate C71 and the liner plate CV81 are made of a copper alloy or stainless steel having good corrosion resistance, and have a liner portion 71e and a liner portion having substantially the same outer diameter as the portion of the impeller 28 other than the blade 28b. 81e, a partition wall 71 having an inner diameter substantially the same as the outer diameter of the impeller 28 and substantially the same diameter as the inner diameter of the storage chamber 8c.
c, and is composed of cylindrical fixing portions 71p and 81p.

The ring plate C72 and the ring plate CV82 has a substantially circular cross-section which covers the blade root of the impeller 28 gradually shallows water passage 72d to the discharge flow path from the suction flow path, 82d and the water flow path 72d, Pockets 72f, 82f (FIG. 5) deeper than 82d are respectively formed.

The water passages 72d, 82d and the pocket 72
Since f and 82f have a three-dimensional special shape, they are made of a synthetic resin that is suitable for mass production and has excellent corrosion resistance.

After the ring plate C72 is stored in the storage chamber 8c, the fixing portion 71p is fixed to the fixing portion 8p of the casing 8.
And is fixed to the casing 8 with fixing screws c91. FIG. 4 shows a front view of this state.

Similarly, after the ring plate CV82 is stored in the storage chamber 9c of the casing cover 9, the fixing portion 81p
On but which is pressure input to the fixed portion 9p of the casing cover 9,
It is fixed to the casing cover 9 with fixing screws CV92. In addition, the liner part 7 which respectively faces the impeller 28
The gaps between 1e and 81e and the impeller 28 and the gap between the partition wall 71c facing the outer periphery of the impeller 28 and the impeller 28 are suppressed to extremely small gaps in order to ensure pump performance. , The locked state of the impeller 28 due to corrosion is prevented.

FIG. 5 is a cross-sectional view along the line A-P-D of FIG. 4, and FIG. 6 is a cross-sectional view along the line C-P-D of FIG.

FIG. 7 is a sectional view showing the overall structure of a vortex pump having pump characteristics different from those of FIGS.
D), which is an example in which the pump output is smaller than in FIGS. 1 to 6. That is, the impeller 28 shown in FIG.
It has a built-in impeller 29 having a smaller outer diameter.

Even if the impeller 28 is replaced with the impeller 29, the casing 8 and the casing cover 9 are the same parts, and have a liner plate C101, a liner plate CV111, a ring plate C102, a ring having a shape suitable for the impeller 29. By replacing the plate with the plate CV112, it is possible to cope with models having different pump characteristics.

[0043]

[0044]

According to the present invention, first, the casing and both casings cover the vortex pump, it
A liner plate having a liner portion and a partition portion formed therein, a ring plate having a water flow path formed therein, and a main body portion having a cylindrical storage chamber for storing the liner plate and the ring plate. Make up and said
Liner plate and ring plate
It can be exchanged according to the size of the impeller incorporated in the
However, by making the main body part common to impellers having different sizes, when manufacturing a plurality of types of vortex pumps having different pump characteristics, as in the conventional case, a casing and a casing cover are provided for each model. It is not necessary, just replace the ring plate and liner plate for each model, the main body is the same part,
It is possible to cope with models having different pump characteristics, so that the investment in molds can be greatly reduced, and an inexpensive vortex pump can be obtained overall.

According to the present invention, secondly, the first
In addition to the structure and effect of the above, the main body is made of cast iron, the ring plate is made of synthetic resin, and the liner plate is made of a corrosion-resistant material such as copper alloy or stainless steel. By configuring the pump with a member suitable for the function, it is possible to obtain a vortex pump that is less expensive than conventional pumps while maintaining pump performance and quality.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view (B-P-D cross-sectional view of FIG. 4) of an overall configuration showing one embodiment of the present invention.

FIG. 2 is a front view of the ring plate 72 of FIG.

FIG. 3 is a front view of the liner plate 71 of FIG.

FIG. 4 is a front view showing a state where a ring plate 72 and a liner plate 71 are attached to the casing 8 of FIG.

FIG. 5 is a cross-sectional view (A-P-D cross-sectional view of FIG. 4) of the overall configuration showing one embodiment of the present invention.

FIG. 6 is a cross-sectional view (a cross-sectional view taken along line C-PD in FIG. 4) of the entire configuration showing one embodiment of the present invention.

7 is a cross-sectional view (a cross-sectional view corresponding to C-P-D in FIG. 4) showing the overall configuration of the vortex pump having pump characteristics different from those in FIGS.

FIG. 8 is a cross-sectional view of the entire configuration showing a conventional example.

FIG. 9 is an exploded perspective view of FIG.

FIG. 10 is an enlarged front view of a casing water flow path 12d in FIG. 8;

11 is an exploded cross-sectional view taken along a dashed line in FIG.

[Explanation of symbols]

5 ... motor, 8 ... casing, 9 ... casing cover,
28: impeller, 51: shaft sealing device, 71: liner plate on casing 8 side, 72: ring plate on casing 8 side, 81: liner plate on casing cover 9 side, 82: ring plate on casing cover 9 side.

Claims (2)

(57) [Claims] 1. A an impeller configured the blade by forming a number of grooves on the outer periphery both sides are directly connected to the motor, the power sale water flow path covering the blade, suction passage passed through the water passage and the communicating and the discharge passage, the partition wall portion, a casing which is composed of the liner portion facing the portion excluding the portions of the blades of the impeller, casing water flow path substantially symmetrical shape water passage of isolating the discharge flow path with the suction passage , in the eddy current type pump comprising a casing cover configured from the liner portion facing the impeller, the both of the casing and the casing cover, it
Three members, a liner plate having a liner portion and a partition portion formed therein, a ring plate having a water flow path formed therein, and a main body portion having a cylindrical storage chamber in which the liner plate and the ring plate are stored. in the configuration
Be those with the liner plate and the ring plate, respectively,
Exchangeable according to the size of the impeller built into the pump
A vortex pump , wherein the main body is common to impellers of different sizes . 2. The vortex pump according to claim 1, wherein the main body is made of cast iron, the ring plate is made of synthetic resin, and the liner plate is made of a corrosion-resistant material such as copper alloy or stainless steel.