JPH0596498U - Submersible pump for deep well - Google Patents

Abstract

(57) [Summary] [Objective] To provide a submersible pump for deep well, which is excellent in sand resistance without increasing cost and lowering pump performance. In a deep well submersible pump including a mixed flow impeller 7, an intermediate casing 3 accommodating the mixed flow impeller 7 is provided with a plurality of ribs 8 located at lower inner corners and arranged at intervals in the circumferential direction. It is characterized by including. The ribs prevent the sand and the like from moving in the circumferential direction, so that the inner lower corner of the intermediate casing is prevented from wearing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a submersible pump for deep wells.

[0002]

[Prior Art]

 Deep water wells for fresh water are generally based on the fact that foreign matter such as sand does not flow into the fresh water, but the actual situation is not always perfect. Therefore, it has been said that the submersible pump for deep well doors is inevitably abraded by sand even if a filter is installed.

That is, in the conventional deep well submersible pump, the intermediate casing interposed between the suction casing and the discharge casing is formed in a smooth cylindrical shape on the inner surface, and is rotated together with the pumped water based on the rotation of the impeller. This is because the inner surface was easily scraped off by the sand and so on.

[0004]

[Problems to be solved by the device]

 Among the conventional submersible pumps described above, particularly those applied to deep wells with a small diameter have a mixed flow impeller a as illustrated in FIG. Most of the sand or the like is spun out along the inner lower corner of the intermediate casing b. Further, a guide groove c for the electric motor cable is formed outside the intermediate casing b, and the thickness of that portion is thin. Therefore, as shown in FIG. 3, the inner lower corner of the intermediate casing b has a wear region d due to sand or the like, and a part of the groove c is perforated e.

The present invention has been made under the above circumstances, and it is an object of the present invention to provide a deep well submersible pump excellent in sand resistance without increasing the cost and without lowering the pump performance. To aim.

[0006]

[Means for Solving the Problems]

 According to the present invention, in a deep-well submersible pump having a mixed flow impeller, an intermediate casing for housing the mixed flow impeller has a plurality of ribs located at lower inner corners and arranged at intervals in the circumferential direction. It is characterized by having.

[0007]

[Action]

 In the above configuration, the ribs prevent circumferential movement of sand or the like, so that abrasion of the inner lower portion of the intermediate casing is prevented.

[0008]

【Example】

 The present invention will be described below with reference to an embodiment shown in FIGS. In FIG. 1, the deep well submersible pump includes a suction casing 1, a discharge casing 2, and a plurality of intermediate casings 3 arranged axially with being interposed therebetween. An electric motor unit 4 is connected below the suction casing 1. A mixed flow impeller 7 rotatably accommodated in the intermediate casing 3 is supported on a main shaft 6 connected to the electric motor shaft 5.

As shown in FIG. 2, the intermediate casing 3 is provided with a plurality of ribs 8 (in the case of two in the figure) which are located at the inner lower corners and are arranged at intervals in the circumferential direction. These ribs 8 do not interfere with the impeller 7 and are located below the discharge holes 9 of the impeller 7.

In the above-described embodiment, the provision of the ribs 8 suppresses the movement of sand or the like in the circumferential direction, so that abrasion at the inner lower corner of the intermediate casing 3 is effectively prevented. Further, even if the cable guide groove 10 is provided on the outer side of the intermediate casing 3, the thin-walled portion caused thereby is not perforated. Further, since the rib 8 is out of the substantial flow path of the pumped water in the intermediate casing 3, it does not adversely affect the pump characteristics. In addition, the cost of adding one rib for providing the rib 8 is negligibly low. It should be noted that the present invention is not limited to the above-described embodiments, and various modifications and applications are possible within the scope of the invention as the gist thereof.

[0011]

[Effect of the device]

 As described above, according to the present invention, it is possible to provide a deep well submersible pump having excellent sand resistance without increasing costs and lowering pump performance.

[Brief description of drawings]

FIG. 1 is a cutaway front view showing an embodiment of the present invention.

FIG. 2 is an enlarged view showing a main part of the embodiment, (A)
Is a cross-sectional view taken along line AA of (B), (B) is B of (A).
-A half-cut sectional view taken along line B.

FIG. 3 shows a main part in a conventional example, (A) is a sectional view taken along the line AA of (B), and (B) is a half-cut sectional view taken along the line BB of (A).

[Explanation of symbols]

 3 ... Intermediate casing, 7 ... Mixed flow impeller, 8 ... Rib.

Claims (1)

[Scope of utility model registration request] 1. A submersible pump for a deep well, comprising a mixed flow impeller, wherein an intermediate casing for housing the mixed flow impeller comprises a plurality of ribs located at inner lower corners and arranged at intervals in the circumferential direction. A submersible pump for deep wells.