JP4518636B2 - Suction cover and strainer fixing structure in submersible pumps - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a suction cover and strainer fixing structure in a submersible pump.
[0002]
[Prior art and its problems]
If the pump casing is made of rubber in order to maintain wear resistance in the submersible pump, if normal bolts are used for assembly, the axial dimension of the pump casing cannot be kept constant due to the compressive force during tightening. . For this reason, conventionally, the pump casing 101 is coupled to the partition plate 105 together with the suction cover 110 using an expensive special bolt 108a also serving as a spacer, with 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 bolts 108b with cap nuts, the strainer 113 is reattached with the nuts 108c as shown in FIG. It must be fixed, increasing the number of assembly steps and the number of parts. In addition, since the main parts (usually three places) of the peripheral wall of the rubber pump casing 101 are merely reinforced linearly by the bolts 108a, the pump casing 101 is deformed by the internal pressure during the pump operation and affects the pump function. Will be affected.
[0003]
OBJECT OF THE INVENTION
The object of the present invention is to keep the axial dimension of the rubber pump casing constant without using expensive special bolts as in the prior art, and to prevent deformation due to internal pressure, along with the fixing operation of the suction cover. An object of the present invention is to provide a pump casing and a strainer fixing structure in which the strainer fixing is performed in a boltless manner, and the number of assembly steps and the number of parts can be reduced to produce a pump at a low cost.
[0004]
[Structure of the invention]
The fixing structure of the suction cover and the strainer in the water pump according to the present invention, as the first invention, the wear elastic material made with pear such as rubber peripheral wall constituting member of the pump casing which is formed inside the vortex winding chamber, said provided with reinforcing walls that contacts the lower surface peripheral portion of rigid seals plates which are polymerized on the upper surface of the peripheral wall constituting member to the outer periphery of the vortex winding portion of the volute of the pump casing, tightening the outside of the reinforcing wall A mounting seat having attachment bolt screw holes is provided, and a suction hole is opened at the center of the suction cover where the upper surface periphery is superposed on the lower surface of the peripheral wall constituting member with rigidity, and the screw holes are formed in the periphery. A concentric bolt head locking hole, and the lower end of the reinforcing wall is above the lower end of the peripheral wall constituting member, and a slight gap is formed between the upper surface of the suction cover and water is passed through the peripheral wall. Holes and bottom plate The side portion is fitted to the inner peripheral surface of the rigid-made annular strainer having the bolt head locking hole and concentrically disposed a bolt operated window outermost surface of the peripheral wall constituting member, the bolt tightening The tip of the screw is screwed into the screw hole of the mounting seat via the bolt head locking hole, and the hole edge of the bolt head locking hole is pressed by the neck of the bolt head, so that the peripheral member and the suction member of the pump casing The cover is integrally coupled, and the peripheral wall constituting member is compressed in the vertical direction and bulged in the radial direction so as to be 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 whose neck portion faces the hole edge of the bolt head locking hole of the suction cover, and a strainer bottom plate at a position rearward of the first head. A second head having a diameter larger than that of the bolt operation window, and when the neck of the first head presses the edge of the locking hole by screwing the bolt, the neck of the second head Is configured so as to be slightly spaced rearward from the hole edge of the operation window.
[0005]
【Example】
The embodiment will be described below with reference to FIGS.
[0006]
1 is a peripheral member of the pump casing whose inside is formed in the spiral chamber 2, and is made of a wear-resistant elastic material such as rubber. 3 is an impeller that is fitted to the lower part of the motor shaft 4 and is accommodated in the spiral chamber 2, and 5 is a rigid seal plate that is superposed on the upper surface of the peripheral wall constituting member 1 to constitute the upper wall of the pump casing. , and the reinforcing wall 6 ... 6 are arranged to be in contact to the outer periphery of the vortex winding portion of the volute 2 of the pump casing from the key points of the underside periphery. Reference numerals 7... 7 are mounting seats attached to the outside of the reinforcing walls 6... 6, and screw holes 9 of the tightening bolts 8 are formed in the lower surfaces thereof. Reference numeral 10 denotes a suction cover which is superposed on the lower surface of the peripheral wall constituting member 1 to form a lower wall of the pump casing. The suction port 11 is opened at the center and the peripheral portion is concentric with the screw holes 9. The bolt head locking holes 12... 12 are arranged and made of a hard material such as metal, or the rigidity is maintained by embedding a metal plate inside a wear-resistant elastic material such as rubber. It has been made. The lower end of the reinforcing walls 6... 6 is slightly above the lower end of the peripheral wall constituting member 1, and a slight gap g is formed between the upper surface of the suction cover 10. 13 is a rigid annular strainer having water passage holes 14... 14 arranged on the peripheral wall, and is arranged concentrically with the bolt head locking holes 12. Bolt operation windows 16... 16 are provided.
[0007]
The inner peripheral surface of the annular strainer 13 is fitted to the outermost peripheral surface of the peripheral wall constituting member 1 of the pump casing, and the bolt head locking holes 12. Via the mounting seat 7... 7, it is screwed into the screw holes 9... 9 on the bottom surface, and the bolt locking holes 12. By pressing the edge portion, the peripheral wall constituting member 1 of the pump casing and the suction cover 10 are integrally coupled, and the peripheral wall constituting member 1 is compressed in the vertical direction and bulged in the radial direction, so that the inner peripheral surface of the strainer 13 Pressure contact. That is, the strainer 13 is firmly fitted to the outer periphery of the pump casing in a boltless manner. Also, to prevent the outer periphery of the vortex winding portion of the volute 2 of the peripheral wall constituting member 1 of the pump casing is forced reinforcing the planar over a wide range by the presence of reinforcing walls 6 ... 6, is deformed by internal pressure However, at the same time, when the suction cover 10 is coupled, the dimension of the axial direction of the pump casing is kept constant by the reinforcing walls 6.
[0008]
Unless the tightening bolts 8... 8 are loosened, the strainer 13 will not fall off under normal pump use conditions. However, assuming extremely severe use conditions, the tightening bolt 8 has a two-stage head structure as shown in FIG. 7, and the neck portion faces the hole edge of the bolt head locking hole 12 of the suction cover 10. It has a head 15 and a second head 15b having a diameter larger than that of the bolt operation window 16 on the bottom plate of the strainer 13 at a position rearward of the first head 15. When the neck portion of the first head 15 presses the hole edge of the locking hole 12, the neck portion of the second head 15 b may be arranged at a position slightly rearward from the hole edge portion of the operation window 16. If configured in this way, for example, when moving underwater where the bottom of the water is very uneven and various fixed bodies such as fallen trees are deposited, the pump may get caught in solids or fall into a recess. Even when a strong impact is applied from the outside, the strainer 13 can be prevented from falling off.
[0009]
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 rearward from the hole edge of the bolt operation window 16, and as in the case of FIG. 1, the suction cover 10 is fixed by the first head 15. When the suction cover 10 is fixed, the strainer 13 is fitted to the outer periphery of the pump casing in a boltless manner by the bulging action in the radial direction of the peripheral member 1 of the pump casing.
[0010]
【The invention's effect】
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 an expensive special bolt as in the prior art, and deformation due to internal pressure can be maintained. There is an advantage that the strainer can be fixed in a boltless manner in accordance with the fixing operation of the suction cover, and the pump can be produced at a low cost by reducing the number of assembly steps and the number of parts.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a main part showing a fixing structure of a suction cover and a strainer in an embodiment of the present invention.
FIG. 2 is a bottom view of a side wall constituting member of a pump casing constituting the structure of the present invention.
FIG. 3 is a bottom view of a suction cover (lower wall constituent member of a pump casing) constituting the structure of the present invention.
FIG. 4 is a bottom view of a seal plate (an upper wall constituent member of a pump casing) constituting the structure of the present invention.
FIG. 5 is a bottom view showing a state in which a peripheral member of a pump casing and a seal plate are fitted in the structure of the present invention.
6 is a longitudinal side view taken along line AA in FIG. 5. FIG.
FIG. 7 is a longitudinal 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 longitudinal sectional side view showing a main part of a conventional fixing structure, in which a pump casing and a suction cover are coupled to a seal plate.
9 shows a state in which a strainer is further coupled from the state of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Perimeter wall component member of pump casing 2 Swirl chamber 5 Seal plate 6 Reinforcement wall 7 Mounting seat 8 Tightening bolt 9 Screw hole 10 Suction cover 11 Suction port 12 Bolt head locking hole 13 Annular strainer 14 Water flow hole 15 Bolt head (First head)
15b Second head 16 Bolt operation window g Gap

Claims (2)

Internal wear elastic material made with pear such as rubber peripheral wall constituting member of the pump casing which is formed into spiral chamber, the pump casing from the bottom surface peripheral portion of rigid seals plates which are polymerized on the upper surface of the peripheral wall constituting member provided with reinforcing walls which are abutted to the outer periphery of the vortex winding portion of the swirl chamber, and attaching a mounting seat having a bolt NishiSoana tightening on the outside of the reinforcing wall, the upper surface peripheral possess rigidity A suction hole is opened in the center of the suction cover that is superposed on the lower surface of the peripheral wall constituting member, and a bolt head locking hole concentric with the screw hole is disposed in the peripheral portion, and the lower end of the reinforcing wall is A slight gap is formed above the lower end of the peripheral wall constituting member and between the upper surface of the suction cover, a water passage hole is provided in the peripheral wall, and a concentric arrangement with the bolt head locking hole is provided in the periphery of the bottom plate. the inner circumference of the rigid-made annular strainer having set by a bolt operated windows Said peripheral wall is fitted to the outermost peripheral surface of the components, the bolt head engaging in screwed to the bolt head and neck to NishiSoana of the mounting seat of the front end of the tightening bolt through the bolt head locking hole stop hole By pressing the edge of the hole, the peripheral component of the pump casing and the suction cover are joined together, and the peripheral component is compressed in the vertical direction and bulged in the radial direction to press against the inner peripheral surface of the strainer peripheral wall. A structure for fixing a suction cover and a strainer in a submersible pump, characterized by comprising:   The tightening bolt has a first head whose neck portion faces the hole edge of the bolt head locking hole of the suction cover, and a diameter larger than the bolt operation window of the strainer bottom plate at a position rearward of the first head. When the neck of the first head presses the hole edge of the locking hole by screwing operation of the bolt, the neck of the second head is removed from the hole edge of the operation window. 2. The suction cover and strainer fixing structure in a submersible pump according to claim 1, wherein the fixing structure is located at a position slightly separated rearward.

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