JP2002021768A - Suction cover in submergible pump and fixing structure for strainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suction cover in a submergible pump and a fixing structure for a strainer capable of keeping a shaft directional dimension of a rubber pump casing constant, capable of preventing deformation by internal pressure and fixing the strainer in a boltless mode according to fixing operation of the suction cover. SOLUTION: A reinforcing wall 6 arranged on the outer periphery of a rigid body seal plate 5 is allowed to abut to an outer peripheral surface of a pump casing peripheral wall constituting member 1 made of an abrasion resistant elastic body, the suction cover 10 possessing rigidity is allowed to abut to an under surface of the peripheral wall constituting member 1, the rigid body strainer 13 is fitted to the outer peripheral surface of the peripheral wall constituting member 1, a fastening bolt 8 is threadedly installed in a bolt threadedly installing hole 9, the pump casing peripheral wall constituting member 1 swells in the radial direction, and is brought into pressure contact with an inner peripheral surface of a peripheral wall of the strainer 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction cover and a fixing structure for a strainer in a submersible pump.

[0002]

2. Description of the Related Art When a pump casing is made of rubber in order to maintain abrasion resistance in a submersible pump, if an ordinary bolt is used for assembling the pump casing, the axial direction of the pump casing is increased by a compressive force at the time of tightening. Cannot be kept constant. For this reason, conventionally, the pump casing 101 is connected to the partition plate 105 together with the suction cover 110 by using an expensive special bolt 108a also serving as a spacer by a structure as shown in FIG. However, the strainer 113 cannot be attached at the same time as the pump casing 101 and the suction cover 110. After fixing the pump casing 101 and the suction cover 110 with the cap nuts 108b, the strainer 113 is re-attached with the nuts 108c as shown in FIG. Therefore, the number of parts increases as the number of assembly steps increases. Further, since only the essential parts (usually three places) of the peripheral wall of the rubber pump casing 101 are linearly reinforced by the bolts 108a, the internal pressure during the operation of the pump deforms the pump casing 101 to affect the pump function. Will have an effect.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to keep the axial dimension of a rubber pump casing constant without using expensive special bolts as in the prior art, to prevent deformation due to internal pressure, and to reduce the suction cover. An object of the present invention is to provide a pump casing and a strainer fixing structure capable of producing a pump at low cost by reducing the number of assembly steps and the number of parts by fixing the strainer in a boltless manner with the fixing operation.

[0004]

In a submersible pump according to the present invention, in a fixing structure of a suction cover and a strainer, as a first invention, a peripheral wall constituting member of a pump casing formed inside a swirl chamber is made of a wear-resistant elastic material such as rubber. A reinforcing wall is provided which is in contact with the outer periphery of the winding of the pump casing from the lower peripheral portion of the rigid seal plate superimposed on the upper surface of the peripheral wall constituting member, and a fastening wall is provided outside the reinforcing wall. A mounting seat having a bolt screw hole is provided, and a suction hole is opened at the center of a suction cover which has rigidity and has an upper peripheral portion overlapped with the lower surface of the peripheral wall component, and a peripheral portion is concentric with the screw hole. The head end of the reinforcing wall is higher than the lower end of the peripheral wall component, and a slight gap is formed between the lower end of the peripheral wall and the upper surface of the suction cover. Arranged bottom plate An annular strainer made of a rigid body having a bolt operation window disposed concentrically with the bolt head locking hole on the side is fitted to the outer peripheral surface of the peripheral wall constituting member, and the tip of the tightening bolt is bolted to the bolt head. By screwing into the screw hole of the mounting seat via the locking hole and pressing the rim of the bolt head locking hole with the neck of the bolt head, the peripheral wall component of the pump casing and the suction cover are integrally connected At the same time, the peripheral wall component is compressed in the vertical direction, swells in the radial direction, and is pressed against the inner peripheral surface of the strainer peripheral wall. According to a second aspect of the present invention, the tightening bolt includes a first head having a neck portion facing a hole edge of a bolt head locking hole of a suction cover, and a strainer bottom plate at a position rearward of the first head. A second head formed to be larger in diameter than the bolt operation window, and when the neck of the first head presses the hole edge of the locking hole by the screwing operation of the bolt, the neck of the second head. Is arranged at a position slightly spaced rearward from the edge of the hole of the operation window.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS.

Reference numeral 1 denotes a peripheral wall constituting member of a pump casing formed inside the spiral chamber 2, and is made of a wear-resistant elastic material such as rubber. Reference numeral 3 denotes an impeller fitted to the lower guide portion of the motor shaft 4 and accommodated in the spiral chamber 2. Reference numeral 5 denotes a rigid seal plate which is superposed on the upper surface of the peripheral wall component 1 and constitutes an upper wall of a pump casing. A reinforcing wall 6... 6 is provided so as to be in contact with the outer periphery of the winding of the pump casing from a key point around the lower surface. 7 are mounting seats attached to the outside of the reinforcing walls 6..., And threaded holes 9 of tightening bolts 8 are formed in the lower surface thereof. Reference numeral 10 denotes a suction cover which is formed on the lower surface of the peripheral wall constituting member 1 and constitutes a lower wall of the pump casing. The suction cover 11 is opened at the center and the peripheral portion is concentric with the screw holes 9. Bolt head locking hole 12
···························································· Made of hard material such as metal,
Alternatively, rigidity is maintained by embedding a metal plate inside a wear-resistant elastic material such as rubber. The reinforcing wall 6
The lower end of 6 is slightly above the lower end of the peripheral wall component 1 and a slight gap g is formed between the lower end of the peripheral wall component 1 and the upper surface of the suction cover 10. 13 is a water hole 14 in the peripheral wall
····· A rigid strainer provided with 14 and having the bolt head locking holes 12 ··· around its bottom plate
.Bolt operation windows 16 arranged concentrically with 12.
16.

The annular strainer 13 is fitted to the outer peripheral surface of the peripheral wall constituting member 1 of the pump casing, and the tips of the tightening bolts 8...
Screw holes 9 on the lower surface of mounting seat 7
9 and press the edge portions of the bolt locking holes 12... 12 with the necks of the bolt heads 15... 15 so that the peripheral wall component 1 of the pump casing and the suction cover 10 are integrated. And the peripheral wall component 1 is compressed in the vertical direction and swells in the radial direction, and presses against the inner peripheral surface of the peripheral wall of the strainer 13. That is, the strainer 13 is firmly fitted to the outer periphery of the pump casing in a boltless manner. Further, the outer periphery of the winding of the peripheral wall constituting member 1 of the pump casing is reinforced in a wide area by the presence of the reinforcing walls 6... 6 and is prevented from being deformed by the internal pressure. When the cover 10 is connected, the dimension in the “axial direction of the pump casing” is kept constant by the reinforcing walls 6.

As long as the tightening bolts 8,... 8 are not loosened, the strainer 13 will not come off in a normal pump use state. However, assuming extremely severe use conditions, the tightening bolt 8 has a two-stage head structure as shown in FIG.
And a second head 15b formed at a position rearward of the first head 15 and larger in diameter than the bolt operation window 16 of the bottom plate of the strainer 13. When the neck of the first head 15 presses the edge of the locking hole 12 by the screwing operation of the bolt 8, the neck of the second head 15 b is slightly separated rearward from the edge of the hole of the operation window 16. It may be configured to be at a position. If configured in this way, for example, when moving in water where the unevenness of the water bottom is severe and various fixed bodies such as fallen trees are deposited, the pump may get caught on solids or fall into a recess Thus, even if a strong shock is received from the outside, the strainer 13 can be prevented from coming off.

Even when the tightening bolt 8 has a two-stage head structure as described above, the fixing action of the strainer 13 is not performed by the second head 15b. The neck of the second head 15b is located at a position slightly separated rearward from the edge of the hole of the bolt operation window 16, and as in the case of FIG.
The fixing of zero is performed by the first head 15, and the strainer 13 is bolted to the outer periphery of the pump casing by the radial expansion of the pump casing peripheral wall component 1 when the suction cover 10 is fixed. It will still be fitted.

[0010]

According to the fixing structure of the suction cover and the strainer in the submersible pump according to the present invention, the axial dimension of the rubber pump casing can be kept constant without using expensive conventional special bolts. In addition, it is possible to prevent deformation due to internal pressure, and to fix the strainer in a bolt-less manner with the fixing operation of the suction cover, thereby reducing the number of assembling steps and the number of parts, thereby providing an advantage that a pump can be produced at low cost.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing a main part of a fixing structure of a suction cover and a strainer according to an embodiment of the present invention.

FIG. 2 is a bottom view of a side wall component of a pump casing constituting the structure of the present invention.

FIG. 3 is a bottom view of a suction cover (a lower wall component of a pump casing) constituting the structure of the present invention.

FIG. 4 is a bottom view of a seal plate (upper wall constituent member of a pump casing) constituting the structure of the present invention.

FIG. 5 is a bottom view showing a state where the peripheral wall constituting member of the pump casing and the seal plate in the structure of the present invention are fitted together.

FIG. 6 is a longitudinal sectional side view taken along line AA of FIG. 5;

FIG. 7 is a vertical sectional side view of a main part showing a fixing structure of a suction cover and a strainer in another embodiment of the present invention.

FIG. 8 is a vertical sectional side view showing a main part of a conventional fixing structure, in which a pump casing and a suction cover are connected to a seal plate.

FIG. 9 shows a state in which a strainer is further coupled from the state of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Peripheral wall constituent member of pump casing 2 Spiral chamber 5 Seal plate 6 Reinforcement wall 7 Mounting seat 8 Tightening bolt 9 Screw hole 10 Suction cover 11 Suction port 12 Bolt locking hole 13 Annular strainer 14 Water hole 15 Bolt head (First head) 15b second head 16 bolt operation window g gap

Claims (2)

[Claims] 1. A peripheral member of a pump casing whose interior is formed in a swirl chamber is made of a wear-resistant elastic material such as rubber, and a peripheral portion of a lower surface of a rigid seal plate superposed on an upper surface of the peripheral member. A reinforcing wall is provided to be in contact with the outer periphery of the winding of the pump casing, and a mounting seat having a screw hole for tightening bolts is provided outside the reinforcing wall. A suction hole is opened at the center of the suction cover overlapped on the lower surface of the peripheral wall component, and a bolt head locking hole concentric with the screw hole is provided in a peripheral portion, and a lower end of the reinforcing wall is formed of the peripheral wall. A slight gap is formed above the lower end of the member and between the upper surface of the suction cover, a water passage hole is provided on the peripheral wall, and the bottom plate peripheral portion is provided concentrically with the bolt head locking hole. A rigid annular strainer having a bolted window Fit to the outer peripheral surface of the wall component,
By screwing the end of the tightening bolt into the screw hole of the mounting seat via the bolt head locking hole and pressing the edge of the bolt head locking hole with the neck of the bolt head, the peripheral wall of the pump casing is The suction in the submersible pump, wherein the component and the suction cover are integrally joined, and the peripheral wall component is configured to be compressed in the vertical direction and swell in the radial direction to be pressed against the inner peripheral surface of the strainer peripheral wall. Fixing structure of cover and strainer. 2. A bolt for fastening, comprising: a first head having a neck portion facing an edge of a bolt head locking hole of a suction cover; and a bolt operation window of a strainer bottom plate at a position rearward of the first head. A second head formed with a larger diameter than the first window, and when the neck portion of the first head presses the hole edge of the locking hole by the screwing operation of the bolt, the neck portion of the second head becomes the operation window. The suction cover and strainer fixing structure of the submersible pump according to claim 1, wherein the suction cover and the strainer are configured to be located slightly away from the edge of the hole.