JP2000356192A - Snake pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily insert a stator in a stator case of a snake pump, and hold elasticity of the stator, so that reaction force by turning of a rotor is sufficiently applied. SOLUTION: This pump is constituted by fitting a stator 2 into a stator case 1, providing mounting flanges 1', 1" at both ends of the stator case 1, and inserting a rotor 3 in the inside of the stator 2. A slit 4 in a direction of the center line (c) is provided in the stator case 1, an external peripheral surface holder 5 of the case 1 is supported to a machine base 6, and an upper/ lower half part 5', 5" of the holder 5 is formed mountable/removable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field in which a stator is fitted to a stator case of a snake pump to simplify the assembly of the snake pump.

[0002]

2. Description of the Related Art A conventional snake pump is composed of a cylindrical stator case made of a relatively thick stainless steel plate, and a rubber stator fitted to the case is pressed against the outer surface of the case to form a rotor and the case. This was to prevent co-rotation.

For this reason, a strong pressing force and a long time are required for inserting the stator against the frictional resistance from one end opening to the other end opening of the case.

[0004] Further, it is necessary to insert the stator in a state where the diameter of the case is increased by heating the case and then reduce the diameter by cooling to room temperature to measure the integration of the case and the stator. There is a difference in inner diameter between the flange (opening) and the inner diameter, and the inner diameter of the flange is rather reduced due to heating and expansion, making it difficult to pass through the stator.

[0005]

SUMMARY OF THE INVENTION According to the present invention, when passing through openings at both ends of a stator case, that is, an inner peripheral portion of a mounting flange, an inner periphery of a main body portion of the case expands in conformity with an outer periphery of the stator, and is rapidly increased. It is another object of the present invention to provide a snake pump which can easily slide the stator into the case.

[0006]

In order to achieve the above object, the present invention comprises fitting a stator to a stator case, providing mounting flanges at both ends of the stator case, and inserting a rotor inside the stator. The stator case is provided with a slit in the center line direction, the outer peripheral surface holder of the case is supported on the machine base, and the upper half and the lower half of the holder are detachably formed. A cylindrical shape made of steel plate, the upper surface of the lower half is an upward concave semi-arc, and the lower surface of the upper half is a downward concave semi-arc, facing both ends of the upper half and the lower half. The snake pump according to the first aspect of the present invention includes a flange, and the opposed flange is fastened and fixed by bolts and nuts.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A material supply box 7 is arranged on a machine base 6,
An annular projection 8 "corresponding to the mounting flange 1 'at one end of the stator case 1 is formed along the inner peripheral edge 8b of the side opening 8a, and the projection 8" and the flange 1' can be detachably attached with the bolt 9. Fixed to.

A starting end flange 2 'formed at one end of the stator 2 is taught between the fixed flange 1' and the inner peripheral edge 8b (FIG. 2A).
Figure).

The end 10 'of the horizontal shaft 10 for driving the rotor is supported by an oil seal 11 and a bearing 12 on the side facing the side opening 8a, and the starting end 3 of the rotor 3 inserted into the stator 2 is provided. And the terminal end 10 'of the shaft 10 are connected by an inclined connecting rod 13, which is connected to the terminal end 10' of the shaft 10 and the start end 3 'of the rotor 3 by universal joints 10 ", 3". Is supported, and the rotation of the shaft 10 causes the rotor 3 to rotate conically around the universal joint 10 ″ of the terminal end portion 10 ′, thereby forming a snake pump.

A mounting flange 1 "is also provided at the other end of the stator case 1, and a base flange 14 'of the nozzle 14 is removably mounted to the flange 1" with bolts and nuts 15, 15'.

The outer peripheral surface holders 5 and 17 are fitted in the middle of the stator case 1 and the middle of the outer jacket 16 of the shaft 10, and the lower halves 5 ″ and 1 ″ of the holders 5 and 17 are respectively fitted.
7 "is supported on the machine base 6 and fixed with bolts and nuts 18 and 18 '. The upper halves 5' and 5 '
17 ′ is the lower half 5 ″, 17 ″ and the opposite flange 7 ′,
7 "is removably fastened and fixed with bolts and nuts 8, 8 '.

The case 1 and the mantle 16 are cylindrical with a stainless steel plate, the upper surface of the lower half 5 ", 17" is an upward concave semicircular shape, and the lower surface of the upper half 5 ', 17'. Is a downwardly concave semi-circular arc, which is matched with the circular outer peripheral surface of the case 1.

A slit 4 (notched groove) is formed in the case 1 between the mounting flanges 1 'and 1 "at both ends in parallel with the cylindrical center line c of the case 1 (FIGS. 1 and 2 (a)).
(B) The case 1 can expand and contract in diameter by the elasticity of the slit 4 and the case 1.
2 (FIG. 2B) can also be enlarged or reduced.

Therefore, as shown in FIG. 3, the stator 2 is inserted into the opening of one end of the stator case 1 before assembly separated from the machine base 6, the material supply box 7 and the nozzle 14 so that the tip of the stator 2 is narrowed. When the starting end flange 2 'is pressed and slid along the center line c toward the other end of the case 1, the outer periphery of the stator 2 passes through the opening and then slightly expands in the radial direction. Since the width t of the slit 4 is slightly opened, the pressing force on the starting end flange 2 ′ of the stator 2 is reduced, and the leading end of the stator 2 slightly projects out of the case 1 through the other end opening of the case 1. In this state, the starting end flange 2 'is in contact with the outer end surface of the mounting flange 1' at one end, and the mounting of the stator 2 on the case 1 is completed.

However, in this state, the expansion of the width t of the slit 4 and the expansion of the middle diameter of the case 1 are not repaired, so that the outer peripheral surface holder 5 provided on the machine base 6 is not repaired.
The lower half 5 ″ and the upper half 5 ′ are fitted to the upper and lower surfaces in the middle of the case 1 and the opposite flanges 7 ′ and 7 ″ at both ends are bolted.
By tightening and fixing the nuts 8 and 8 ', the expansion of the width t and the expansion of the middle diameter of the case 1 can be restored to the normal width and the normal diameter.

In this state, the inner surface of the spiral of the stator 2 exhibits a sufficient elasticity, and the pushing pressure of the snake pump due to the rotation of the rotor 3 can be sufficiently maintained.

In the drawing, reference numeral 19 denotes a driving motor room, 2
Reference numeral 0 denotes a reduction gear chamber, and reference numeral 21 denotes a starting end passive portion of the horizontal shaft 10.

[0018]

Since the present invention is constructed as described above, not only can the elastic stator be smoothly pressed and inserted from one end opening of the stator case, but also the width of the slit formed in the case can be increased and the width of the case can be increased. The expansion of the diameter can be repaired by the outer peripheral surface holder, the elasticity of the stator can be maintained, and the reaction force due to the rotation of the rotor can be sufficiently applied to the inner surface of the spiral of the stator.

[Brief description of the drawings]

FIG. 1 is a perspective view of a snake pump according to the present invention.

FIG. 2A is a longitudinal sectional side view of the snake pump of the present invention. FIG. 2B is a longitudinal sectional front view taken along line AA of FIG.

FIG. 3 is a perspective view showing a state where a stator is pressed and inserted into a stator case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator case 1 ', 1 "Mounting flange 2 Stator 3 Rotor c Center line 4 Slit 5 Outer surface holder 5' Upper half 5" Lower half 6 Machine base 7 ', 7 "Opposite flange 8, 8' Bolt nut

Claims (2)

[Claims] 1. A stator is fitted to a stator case, and mounting flanges are provided at both ends of the stator case.
The rotor is inserted inside the stator, the stator case is provided with a slit in the center line direction, the outer peripheral surface holder of the case is supported on the machine base, and the upper half and lower half of the holder are detachable. Snake pump formed in 2. The stator case has a cylindrical shape made of a stainless steel plate, an upper surface of a lower half portion has an upward concave semi-arc shape, and a lower surface of the upper half portion has a downward concave semi-arc shape. Opposite flanges are provided at both ends of the upper and lower parts.
2. The snake pump according to claim 1, wherein the snake pump is fastened and fixed with a nut.