JPS5847276Y2 - wesco pump - Google Patents

Description

[Detailed Description of the Invention] Field of Application of the Invention The present invention relates to a Wesco pump, and particularly to a shaft sealing device portion of a Wesco pump.

BACKGROUND OF THE INVENTION FIGS. 1 and 2 are cross-sectional views of a conventionally known Wesco pump.

To explain these drawings, an impeller 3 is attached to a shaft 2 of an electric motor 1, a casing 4 and a casing cover 5 are attached to surround the impeller 3, and a pump chamber 6 is formed by these two members. It is formed.

When the impeller is rotated by the electric motor 1, there is a negative pressure on the suction side 7 of the pump and water reaches the pump device through the suction pipe 8.

The water flowing into the pump device further passes through the check valve 9 and reaches the pump chamber 6.

The water in the pump chamber 6 is pressurized by the impeller 3 rotating at high speed, then flows into the steam/water separation chamber 11, and is further supplied to the outside via the inner discharge pipe 12 and the discharge pipe 13.

Further, a bottomed cylindrical seal box 14 is integrally formed on the motor 1 side of the casing 4, and a shaft hole 14A through which the shaft 2 passes is bored in the bottom of the seal box 14.

Further, a shaft seal device 15 is installed in the seal box 14 to prevent water in the pump chamber 6 from leaking to the motor 1 side, thereby preventing deterioration of the insulation properties of the motor 1 and pump performance. .

The shaft seal device 15 usually uses a mechanical seal,
This consists of a fixed part 16 attached to the bottom 14A of the seal box 14, and a rotating part 1 attached to the shaft 2 in a water-sealing manner.
The fixed part 16 and the rotary part 17 rotate and slide to form a sealing surface 18, which prevents water in the pump chamber 6 from leaking.

Due to the structure of the mechanical seal, the rotating part 17 and the fixed part 16 slide together on the sealing surface 18 during pump operation to maintain a water sealing effect, so the contact surface between the rotating part 17 and the fixed part 16 is It will wear out due to operation.

In particular, with this type of pump, foreign matter such as sand gets mixed into the pumped water, and rust occurs on the inner wall of the seal box 14, so the wear progresses rapidly and eventually the shaft seal device It becomes impossible to maintain the water seal function, which is the function of

For these reasons, it is desired to propose a pump in which the shaft sealing device 15 can be easily replaced.

In addition, generally, the Wesco pump is as shown in Figure 2.
In order to prevent high-pressure water on the discharge side 10 of the casing 4 from flowing back to the suction side T and reducing pump performance, a liner portion 19 is formed on each of the casing 4 and the casing cover 5.

The liner part 19 has the function of reducing the gap 20 formed between the liner part 19 and the impeller 3, respectively, and reducing the return of pressurized water from the discharge side 10 to the suction side 7.

If the liner part 19 is worn out by sand contained in the pumped water or rust from the piping, the gap 20 becomes larger, and the pumped water flows back through the gap 20 from the discharge side 10 to the suction side 7.
If the performance of the pump deteriorates or if it is severely worn, it may become impossible to pump water.

Therefore, if the wear-out is excessive, it is necessary to replace the casing 4.

However, in the conventional WESCO pump, as shown in FIG. 1, the casing 4 includes a check valve 9, a steam/water separation chamber 11. Electric motor 1
In order to replace the casing 4, it is necessary to disassemble several parts of the pump section.

Therefore, a lot of time and effort had to be spent on repairs and replacements.

Further, in the case of a small-sized Wesco pump, the diameter of the impeller 3 is generally small, and the liner portion 19 that faces the impeller 3 with a gap 20 is also small.

Therefore, the inner diameter d of the seal box 14 formed in relation to the liner part 19 must also be reduced, so that the gap 21 between the shaft sealing device 15 and the inner wall 22 of the seal box 14
Of course, it will also become smaller.

In this case, it is extremely difficult to remove the shaft sealing device 15 housed in the deep seal box 14 with a small inner diameter d, requiring special tools, or causing damage when installing and removing the shaft sealing device 15. Or, the shaft sealing device 15 may not be installed correctly.

In addition, it is extremely difficult to check whether the shaft sealing device 15 is installed correctly because the gap 21 between the shaft sealing device 15 and the inner wall 22 of the seal box 14 is small, and the assembly may be incomplete. In this case, the shaft sealing device 15
may wear out prematurely or cause water leakage.

Purpose of the invention The present invention was made with attention to the above-mentioned points, and its purpose is to facilitate the installation and removal of the shaft sealing device, and to enable the pump to be installed without disassembling the casing, which is the basic structure of the pump. The goal is to be able to recover performance.

Summary of the invention In this invention, the seal box of the casing is formed with a diameter that gradually increases toward the impeller side, and an inner case is removably provided in the opening of the seal box, so that when the inner case is removed, the shaft sealing device By increasing the interflow between the inner case and the seal box, fingers can easily enter, which makes it easier to install and remove the shaft seal, and if the inner case becomes worn or damaged, the inner case can be replaced to improve pump performance. The structure is such that the main casing does not need to be replaced.

Embodiments of the invention Hereinafter, embodiments of the invention will be described with reference to FIGS. 3 to 5.

3 and 4 show a first embodiment of the present invention, and FIG. 5 shows a second embodiment.

In the first embodiment shown in FIGS. 3 and 4, an inner case 23 in which a liner part 19, a seal box 14, and a pump chamber 6 are formed is removably attached to the casing 4, and a seal box of the casing 4 is provided. 14 has a basic configuration in which an opening is formed so as to gradually widen toward the impeller 3.

Hereinafter, an explanation will be given based on the drawings.A shaft 2 of an electric motor 1 attached to one side of a casing 40 passes through the casing 4, and an impeller 3 is attached to the tip of the shaft 2.

The shaft sealing device 15 has a fixing part 16 installed inside the casing 4,
The rotating part 1T is attached to the shaft 2.

In addition, an inner case 230 is provided so as to surround the shaft sealing device 15.
A cylindrical portion 26 is mounted within the seal box 14 of the casing 4.

Further, a liner 19 is formed in the inner case 23 so as to face the impeller 3, and further extends in the outer circumferential direction so as to form a pump chamber 6.

Furthermore, the end 27 of the inner case 23 is extended in the axial direction to form the outer peripheral wall 24 of the pump chamber 6, and the casing cover 5 is attached to the outer peripheral wall 24 from the side opposite to the electric motor 10 with a packing 25.
It is installed watertight through the

As is clear from this configuration, the pump chamber 6 is formed by the casing cover 5 and the inner case 23.

Further, the seal box 14 formed in the casing 4 is opened so as to gradually widen toward the impeller 3.
The seal box 14 is covered with an inner case 23 so as to close the opening.

As shown in the figure, the opening 31 of the seal box 14 of the casing 4 is thicker than the inner diameter A of the liner opening 32 provided in the liner portion 19 of the inner case 23.

According to the first embodiment of the present invention, the casing 4
The inner case 230 cylindrical portion 26 is located so as to surround the shaft sealing device 15 in the seal box 14 .

Therefore, when replacing the shaft sealing device 15, by sequentially removing the casing cover 5, impeller 3, and inner case 23, the shaft sealing device 15 appears in the seal box 14, which is gradually opened wider.

Therefore, while looking at the entire shaft sealing device 15, and since the seal box 14 has a large opening, the shaft sealing device 15 can be easily removed without damaging it.

Furthermore, when installing the shaft sealing device 15, the fixed part 16 is first attached to the casing 4, and then the rotating part 17 is attached to the shaft 2.
At the same time, it is fitted to the fixing part 16.

In this case as well, the shaft sealing device 15 can be installed while looking at the entire shaft sealing device 15, and even after it is assembled, it can be confirmed whether it is correctly installed.

Thereafter, the assembly is completed by sequentially assembling the inner case 23, impeller 3, and casing cover 5.

With the above configuration, the shaft sealing device can be installed and removed without disassembling the casing 4 connected to the electric motor 1, which not only makes the work easier, but also improves the reliability of the installation. It is possible to prevent premature wear of the shaft seal device 15 and water leakage due to poor assembly.

Furthermore, if the inner case 23 is made of a corrosion-resistant material such as synthetic resin, even if the seal box 14 of the casing 4 is made of cast metal, rust generated on the inner wall 22 of the seal box 14 will adhere to the shaft sealing device 15. You can prevent it from happening.

In this way, the shaft sealing device 15 is connected to the cylindrical portion 26 of the inner case 23.
By surrounding and protecting the shaft sealing device 15, it is possible to prevent the shaft sealing device 15 from being worn out due to rust generated from the casing 4, and it is possible to maintain a longer service life.

If the liner part 19 is worn away by sand or the like and the performance of the pump deteriorates, the conventional pump performance can be regained by replacing the inner case 23.

In addition, by appropriately changing the shape or dimensions of the inner case 23, the performance of the pump can be changed, and other parts such as the casing 4 can be shared with other pump models, making it possible to improve production and management. , and improve serviceability.

FIG. 4 is an application example of FIG. 3 in which the shaft seal device 15 is wrapped in the cylindrical portion 26 of the inner case 230, and a floating sheet 28 constituting the fixing portion of the mechanical seal and a cushioning rubber 29 that supports this are provided. After surrounding the floating sheet 28, the shape of the shock absorbing comb 29 is adjusted so that the peripheral end 30
is further extended in the opposite radial direction to form an inner case 230 seat.

Therefore, due to the elasticity of the buffer rubber 290, when the casing cover 5 is assembled in contact with the inner case 23, errors in the dimensions of each component can be absorbed, and the ease of assembly is further improved.

FIG. 5 shows a second embodiment of the present invention, in which the inner case 23 has a liner part 19 and an outer peripheral wall part 24, and is attached to the casing 4, and the inner case 23 and the casing cover 5 At the same time, a pump chamber 6 is formed by covering the impeller 3.

The opening 31 of the seal box 14 of the casing 4 is connected to the liner portion 1 provided in the inner case 23 in close proximity to the impeller 3.
It is formed larger than the inner diameter A of the liner opening 32 of No. 9.

If the seal box 14 is made of a corrosion-resistant material, the liner portion 19 and the outer peripheral wall portion 24, or only the liner portion 19 may be formed in the inner case 23 as in this example.

As described above, according to the present invention, the seal box 14 of the casing 4 is gradually opened larger toward the impeller 3, so that the shaft sealing device can be easily and reliably installed and removed. , the reliability and ease of assembly of the shaft seal are improved.

Further, by configuring the inner case 23 to be detachably attached to the seal box 14, the performance of the pump can be restored without disassembling the casing.

[Brief explanation of drawings]

Figure 1 is a front view of a conventional Wesco pump, and Figure 2 is a front view of a conventional Wesco pump.
3 is a sectional view of the Wesco pump showing the first embodiment of the present invention, FIG. 4 is a sectional view of the shaft sealing device part showing an application example of FIG. The figure is a sectional view of a Wesco pump showing a second embodiment of the present invention. 14...Seal box, 23...Inner case, 24...Pump chamber, 26...
Cylindrical part, 32... Liner opening.

Claims (1)

[Scope of utility model registration request] An electric motor, a casing attached to the electric motor, a seal box formed in the casing, a shaft hole provided at the bottom of the seal box, a pump cover attached to the casing, and the casing and the pump cover. a shaft sealing device installed in the seal box, a rotating shaft of an electric motor whose end reaches the pump chamber by penetrating the shaft hole of the sealing box and the shaft sealing device, and this rotating shaft. and an impeller fixed to the tip of the pump and rotatably arranged in the pump chamber, the seal box of the casing is gradually made larger in diameter toward the impeller, and the impeller and smaller An inner case facing with a gap and having a part of the liner and a liner opening is removably provided in the opening of the seal box, and the diameter A of the liner opening of the inner case is smaller than the opening of the seal box. Wesco pump is characterized by: