JPS5815678Y2 - Structure of motor pump bearings and seals - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a bearing/seal portion of a motor pump.

FIG. 1 is a cross-sectional view schematically showing a submersible pump. As shown in the figure, the submersible pump includes a motor section M, a motor housing 1 constituting the outer shell of the motor section, The partition plate 2, the impeller attached to the lower end of the motor shaft rotatably supported by bearings 5 and 6, the perforated bottom plate 8, the motor cover 3, the motor housing 1, the perforated bottom plate 8, etc. The tightening device is schematically composed of a tightening tool 10 and the like assembled together, and when the motor of the motor section M is energized, the impeller 7 rotates, and water is sucked in through the hole in the perforated bottom plate. , and is discharged to the outside from a discharge port 9' through a passage 9.

By the way, manufacturing the outer shell of a submersible pump with such a configuration, such as the motor housing, mechanical seal housing, etc. from a steel plate by press processing, can reduce costs compared to manufacturing using a mold that involves machining. In addition, it has many advantages such as reducing the weight of the entire pump.\The bearing/seal part shown by symbol C in Figure 1 has a complicated structure and is difficult to maintain airtight, and requires many machining steps. There was a drawback to that.

For example, FIG. 2 is an enlarged view showing an example of portion C in FIG. 1. As shown in the figure, a mechanical seal housing 20 is welded to the motor housing 1, and In a structure in which a mechanical seal case 21 is welded to the motor housing 1, the radial position of the bearing 6 is determined by the motor housing 1, and the radial position of the mechanical seal 22 is determined by the mechanical seal housing 20 (or mechanical seal case 2).
1), and positioning in the thrust direction is done by bearing 6.
Since both the mechanical seal 22 and the mechanical seal 22 are formed in the mechanical cool housing 20, two welding locations are required.

These welding points must be sealed all around, so in order to check whether the sealing effect by welding is complete or not, the inside of the motor housing 1 and the mechanical seal housing 20 must be sealed after welding. There is no need to worry about increasing the air pressure and checking from the outside, attaching a blind cover to the mechanical seal case 21 to seal its outer periphery, increasing the air pressure inside the mechanical seal housing 20, and checking from the motor housing 1 side. A lot of work was required.

Further, there were disadvantages in that positioning was inaccurate due to welding distortion and sealing performance was not sufficient.

Therefore, the purpose of the present invention is to provide a bearing/seat for a motor pump that requires only one welding point, has positive positioning, and has good sealing performance.

According to the present invention, a motor pump is provided with a mechanical seal housing welded adjacent to the motor housing, a bearing for the motor shaft in the motor housing, and a mechanical seal in the mechanical seal housing between the impeller and the bearing. A distance piece is interposed between the bearing and the mechanical seal, so that the mechanical seal is held in the axial direction by the bearing via the distance piece, and the mechanical seal is supported in the radial direction. A hanging piece is formed radially inward of the mechanical seal housing.

Therefore, the radial positioning of the bearing is done by the motor housing, the radial positioning of the mechanical seal is done by the mechanical seal housing,
The positioning of the mechanical seal in the thrust direction is determined by a bearing via a distance piece.

Therefore, only one welding point, the entire circumference of the motor housing and the mechanical seal housing, is required, making it easy to confirm the seal, and providing good positioning and sealing performance.

In carrying out the present invention, the distance piece includes a first horizontal part in contact with the bearing, a second horizontal part in contact with the mechanical seal, and a distance between the first horizontal part and the second horizontal part in order to determine the distance between the bearing and the mechanical seal. It consists of a bent part that is bent from a part.

Although the submersible pump will be explained in more detail with reference to the drawings below, it is clear that the structure of the bearing/seal portion according to the present invention can also be applied to general motor pumps other than submersible pumps.

Now, FIG. 3, which shows one embodiment of the present invention, is an enlarged view of part 0 of FIG. It can be seen that the same symbols are attached.

Therefore, numeral 4 indicates the motor shaft, numeral 6 indicates the bearing, 1 indicates the motor housing, 20 indicates the mechanical seal housing, and 22 indicates the mechanical seal. As shown in the figure, the motor housing 1 is Rising part 1'
, and the mechanical seal housing 20 is the hanging piece 2
0', and both housings are placed back to back and welded to maintain airtightness.

One of the features of the structure of the bearing/seal portion of the motor pump according to the present invention is that the bearing 6 of the motor shaft and the mechanical seal 22
The point is that a distance piece 30 is provided in the space between the A step is formed like this.

) is configured and configured to suit.

That is, the distance piece 30 has a first horizontal portion 33 in contact with the bearing 6, a bent portion 32 that is bent and hangs down from the first horizontal portion, and a bent portion 32 that is in contact with the mechanical seal 22 and extends from the bent portion 34 to the first horizontal portion. and a second horizontal section extending in the opposite direction.

Note that even a ring-shaped distance piece can fulfill its function.

Since the structure of the bearing/seal portion of the motor pump according to the present invention is configured as described above, the radial position of the bearing 6 and the mechanical seal 22 is determined by the motor housing 1.
The distance piece 30 is pressed against the mechanical seal housing 20 by the bearing 6 since the motor shaft 4 generally has a force acting toward the impeller.

Therefore, the axial position of the mechanical seal 22 is determined by the bearing.

As mentioned above, the bearings and
The structure of the seal part is simple, easy to process, and requires only one welding point, so there is little risk of welding distortion and good sealing performance can be maintained.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an example in which the structure of the bearing/seal part of the motor pump according to the present invention is applied to a submersible pump, and Fig. 2 is a sectional view showing a conventional example of part 0 in Fig. 1. analytical surface drawing,
FIG. 3 is an enlarged sectional view of section C in FIG. 1, showing an embodiment of the structure of the bearing/seal part of the motor pump according to the present invention. 1...Motor housing, 4...Motor shaft, 6...Bearing (ball bearing), 20...
・Mechanical seal housing sink, 22... Mechanical seal, 30... Distance piece.

Claims (2)

[Scope of utility model registration request] (1) In a motor pump in which a mechanical seal housing is welded adjacent to the motor housing, a bearing for the motor shaft is provided in the motor housing, and a mechanical seal is provided in the mechanical seal housing between the impeller and the bearing, the bearing and the mechanical seal are provided. A distance piece is interposed between the mechanical seal and the mechanical seal, so that the mechanical seal is held in the axial direction by the bearing via the distance piece, and the mechanical seal is supported in the radial direction by the mechanical seal housing. A structure of a bearing/seal part of a motor pump characterized by forming an inwardly hanging piece. (2) The distance piece is a first horizontal part in contact with the bearing, a second horizontal part in contact with the mechanical seal, and a distance piece from the first horizontal part and the second horizontal part in order to determine the distance between the bearing and the mechanical seal. The structure of a bearing/seal part of a motor pump according to claim 1, which is comprised of a bent part.