JP2018178915A - Pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump 1 capable of improving assembling strength of an impeller 30 and a rotation axis 10 in a simple low-cost structure.SOLUTION: A pump 1 comprises: a sleeve 20 fitted to a rotation axis 10 having a tapered fitting part 25 having a diameter increasing from one end side 10A toward another end side 10B, provided on the outer peripheral surface; and an impeller 30 having a main plate 31 formed with a shaft insertion hole 31a through which the rotation axis 10 is inserted, and a plurality of blades 33 attached to the main plate 31, the main plate 31 being fitted to the fitting part 25, in which the fitting part 25 is provided with a friction providing part for imparting a frictional force.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pump.

  The centrifugal pump sucks the target fluid from the inlet facing in the axial direction along the axial direction of the rotary shaft by rotating the impeller attached to the rotary shaft, and uses centrifugal force to move radially outward And discharge. Here, a centrifugal force acts in a radial direction due to its own weight, and an axial force and a circumferential force act on an impeller that rotates with the rotation shaft, due to the reaction force from the sucked fluid. A structure for securing between the impeller and the rotating shaft in order to rotate the impeller attached to the rotating shaft against the axial force and the circumferential force acting from such fluid have. For example, the key and key groove are processed between the impeller and the rotary shaft, and the key has a key structure in which the key fits in the key groove, whereby the rotary shaft resists the reaction force from the fluid. It becomes rotatable with it.

  On the other hand, in the case of a relatively small and inexpensive centrifugal pump, providing the key structure on the impeller and the rotary shaft increases the processing, increases the processing cost, and has a large impact on the price. For this reason, in such a centrifugal pump, the impeller needs to be attached to the rotating shaft against the reaction force according to the required performance with a simple configuration. For example, in the pump of Patent Document 1, a conical sleeve is fitted to the shaft, the main plate of the impeller is fitted to the sleeve, and locking is performed by a nut from the rear side. There is.

China Utility Model Publication No. 204041532

  However, in the pump of Patent Document 1, the impeller is only fitted to the conical sleeve. For this reason, even if a force larger than the planned force is applied, or even if the fitted state is loosened due to aged deterioration, a structure capable of maintaining the fixed state more reliably is required. It was

  Then, this invention is made in view of the situation mentioned above, Comprising: The pump which can improve the assembly strength of an impeller and a rotating shaft with the simple structure of low cost is provided.

In order to solve the above-mentioned subject, the present invention adopts the following means.
That is, in the pump according to one aspect of the present invention, a tapered attachment portion whose diameter increases from one end to the other end is provided on the outer peripheral surface, and a sleeve fitted to the rotation shaft and the rotation shaft are inserted. The shaft insertion hole includes a main plate and a plurality of blades attached to the main plate, and the main plate includes an impeller fitted to the attachment portion, and the attachment portion has a friction force with the main plate A friction imparting portion is provided to impart

  According to this configuration, by inserting the sleeve fitted to the rotary shaft into the shaft insertion hole of the main plate, the impeller has a taper whose diameter increases from one end to the other end on the outer peripheral surface of the sleeve. The main plate is fitted to the hook-shaped mounting portion. Here, the attachment portion is provided with a friction applying portion for applying a frictional force to the main plate, whereby the main plate of the impeller can be firmly fixed by the generated frictional force. For this reason, it is not necessary to provide a key structure or the like, and the assembly strength can be improved by providing a means for applying a frictional force to the mounting portion, so that the cost can be suppressed with a simple configuration.

  Further, in the pump according to one aspect of the present invention, the friction applying portion may have a friction applying film formed on the surface of the mounting portion.

  According to this configuration, by fitting the main plate of the impeller to the friction imparting film, the friction imparting film can increase the frictional force, thereby improving the assembly strength. Here, since the membrane is only formed on the mounting portion of the sleeve, the cost can be suppressed with a simple configuration.

  In the pump according to one aspect of the present invention, the friction applying portion may have a plurality of grooves formed on the surface of the mounting portion.

  According to this configuration, the main plate of the impeller is engaged with the mounting surface in which the plurality of grooves are formed, whereby the main plate is restrained by the main plates being engaged with the plurality of grooves, thereby improving the assembly strength. be able to. Here, since only a plurality of grooves are formed in the mounting portion of the sleeve, the cost can be suppressed with a simple configuration.

  According to the present invention, the assembly strength between the impeller and the rotating shaft can be improved with a low cost and simple structure.

It is the sectional view which looked at the radial direction showing the pump of an embodiment of the present invention. It is sectional drawing which shows the detail of the sleeve in the pump of embodiment of this invention. It is sectional drawing which shows the detail of the sleeve of the modification of embodiment of this invention. FIG. 10 is a side view showing the detail of the sleeve of the first modified example of the embodiment of the present invention. FIG. 10 is a side view showing details of a sleeve of a second modified example of the embodiment of the present invention. FIG. 18 is a side view showing the detail of the sleeve of the third modified example of the embodiment of the present invention.

Hereinafter, one embodiment according to the present invention will be described with reference to FIG. 1 and FIG.
1 and 2 show a pump 1 of the present embodiment. As shown in FIGS. 1 and 2, the pump 1 according to the present embodiment includes a rotary shaft 10, a sleeve 20 fitted to the rotary shaft 10, an impeller 30 fitted to the sleeve 20 and a flow path A, and an impeller 30 and a lock nut 50 for fixing the same. In addition, below, the upper side of the rotating shaft 10 in FIG.1 and FIG.2 is called the one end side 10A, and a lower side is called the other end side 10B.

  The impeller 30 has a substantially disk-shaped side plate 32 between the main plate 31 and a disk-shaped main plate 31 formed with a shaft insertion hole 31a in which the rotary shaft 10 is inserted at the center, and the main plate 31. And a side plate 32 and a plurality of blades 33 fixed to each of them, and a substantially disk-shaped reinforcing member 34 fixed to the main plate 31. In the present embodiment, all of the main plate 31, the side plate 32, the blade 33, and the reinforcing member 34 are formed of a plate material made of metal such as stainless steel, and the predetermined plate as described below by processing the plate material. It is formed in the shape of. The processing method is not limited to this, and may be formed into a predetermined shape by, for example, cutting or forging.

  In the main plate 31, the surface facing the other end side 10B constitutes a flow path forming surface 31b facing the flow path A. The main plate 31 protrudes on the other end side 10B so that the inner peripheral side where the shaft insertion hole 31a is formed is along the axial direction Z of the rotating shaft 10. The flow passage forming surface 31b of the main plate 31 is arranged along the axial direction Z on the inner peripheral side where the shaft insertion hole 31a is formed, and is curved along the radial direction gradually toward the outer peripheral side. It is formed in the shape of a circle. In the present embodiment, the main plate 31 is formed of a plate material, and not only the flow path forming surface 31b but the entire member protrudes on the inner peripheral side to the other end side 10B and gradually extends in the radial direction toward the outer peripheral side. It is formed in the shape of a circle.

  In the side plate 32, a surface facing the one end side 10A constitutes a flow path forming surface 32b facing the flow path A. An opening 32 a is formed at the center of the side plate 32. The side plate 32 also protrudes on the other end side 10B so that the inner peripheral side where the opening 32a is formed is along the axial direction Z. The flow passage forming surface 32b of the side plate 32 is arranged along the axial direction Z on the inner peripheral side where the opening 32a is formed, and is curved along the radial direction toward the outer peripheral side. It is formed. In the present embodiment, the side plate 32 is formed of a plate material, and not only the flow path forming surface 31 b but the entire member protrudes toward the other end side 10 B on the inner peripheral side and gradually extends in the radial direction toward the outer peripheral side. It is formed in the shape of a circle. Then, a suction port 30a for sucking fluid is formed between the main plate 31 and the side plate 32 so as to face the other end side 10B of the rotary shaft 10 on the inner peripheral side, and between the main plate 31 and the side plate 32 on the outer peripheral side. A discharge port 30 b for discharging the fluid is formed so as to face the outer peripheral side in the radial direction.

  The plurality of blades 33 are curved so as to extend from one side to the other side in the circumferential direction as going from the inner peripheral side to the outer peripheral side. And between the blades 33, the flow path A through which a fluid flows is comprised. One end of the blade 33 is fixed to the flow path forming surface 31 b of the main plate 31. Further, the other end of the blade 33 is fixed to the flow path forming surface 32 b of the side plate 32. Various known methods can be applied as the fixing method, for example, welding.

  The reinforcing member 34 is fixed to the outer peripheral end of the main plate 31 on the outer peripheral side. As a fixing method, various known methods can be applied, for example, welding. The reinforcing member 34 is formed in a dome shape so as to protrude toward one end side 10A of the rotating shaft 10 from the outer peripheral side toward the inner peripheral side, and the rotating shaft 10 and the sleeve 20 are inserted through the center A through hole 34a is formed.

  The sleeve 20 is formed of metal such as stainless steel. The sleeve 20 has a substantially cylindrical shape, and the inner circumferential surface 20 a is in contact with the outer circumferential surface 10 a of the rotating shaft 10 and is fitted to the rotating shaft 10. Various methods known in the art can be applied as a method for fitting the sleeve 20 to the rotary shaft 10, but a method of press-fitting with the inner diameter substantially the same as or slightly smaller than the rotary shaft 10 or temperature deformation It is attached by tight fit etc. The outer peripheral surface 20b of the sleeve 20 is formed in a tapered shape whose diameter increases from the one end 10A toward the other end 10B. And in the outer peripheral surface 20b, a part of 10 A of one end side is the attaching part 25 to which the impeller 30 is fixed. The surface of the mounting portion 25 is provided with a friction applying portion 27 for applying a frictional force. In the present embodiment, a friction applying film 27 a is provided as the friction applying unit 27. The friction imparting film 27 a applies a frictional force between the sleeve 20 and the impeller 30 by a friction characteristic having a high friction coefficient of the material, or by plastically deforming between the impeller 30 and the sleeve 20. As such a friction imparting film 27a, for example, a film made of a urethane resin may be mentioned. For example, it is formed of a urethane resin, and the film thickness is, for example, 20 to 100 μm. Further, on one end side 10A of the outer peripheral surface 20b of the sleeve 20, there is provided an external thread 20c. The outer peripheral surface of the sleeve 20 in the portion where the male screw portion 20c is formed is formed in a tapered shape whose diameter increases from the one end 10A to the other end 10B.

  The lock nut 50 has a female screw portion 50 a screwed to the male screw portion 20 c of the sleeve 20. The female screw portion 50a has the same diameter along the axial direction Z. Therefore, when the female screw 50a of the lock nut 50 is screwed into the male screw 20c of the sleeve 20, the diameter of the male screw 20c gradually increases. The female screw portion 50a of the connector is fitted. Then, in a state where the lock nut 50 is fitted to the sleeve 20, the surface of the other end 10B of the lock nut 50 abuts on the reinforcing member 34, and restricts the movement of the impeller 30 to the other end 10B.

Next, the operation and effect of the pump 1 of the present embodiment will be described.
First, when assembling the impeller 30, the impeller 30 is fitted from the one end side 10A to the sleeve 20 which is fitted to the rotary shaft 10 in advance. Since the outer peripheral surface 20b of the sleeve 20 has a small diameter at one end 10A, the impeller 30 is fitted without interference with the sleeve 20. Since the diameter of the outer peripheral surface 20b of the sleeve 20 increases toward the other end 10B, the inner peripheral surface of the shaft insertion hole 31a of the impeller 30 in the mounting portion 25 at the outer peripheral surface 20b of the sleeve 20 on the way Are in contact and a frictional force is generated to be in a fitted state. Here, the attachment portion 25 is provided with a friction applying portion 27 for applying a frictional force to the main plate 31. Thus, the main plate 31 of the impeller 30 can be firmly fixed by the generated frictional force. For this reason, there is no need to provide a key structure or the like, and the assembly strength can be improved by providing a means for applying a frictional force to the mounting portion 25. Therefore, the cost can be suppressed with a simple configuration. And, by forming the friction imparting film 27 a formed on the surface of the mounting portion 25 as such a friction imparting portion 27, it is possible to increase the frictional force and to thereby improve the assembly strength. Here, since the film is only formed on the mounting portion 25 of the sleeve 20, the cost can be suppressed with a simple configuration. For example, by using a film made of a urethane resin as described above, the frictional force can be easily improved simply by forming a film by a known coating technique.

  3 to 6 show modified examples of the friction applying portion. As shown in FIG. 3, a plurality of grooves 61 are provided on the outer peripheral surface of the mounting portion 25 as the friction applying portion 60. As in the first modification shown in FIG. 4, each groove 61 may be formed along the circumferential direction, and a plurality of grooves 61 may be formed at intervals in the axial direction Z. As in the second modified example shown in FIG. 5, each groove may be formed along the axial direction Z, and a plurality of grooves may be formed at intervals in the circumferential direction. The respective grooves may be formed in a spiral shape so that the grooves 61 extend from one side to the other side in the circumferential direction from the one side to the other side in the axial direction Z as in the third modification shown in FIG. . These grooves can be formed on the outer peripheral surface of the sleeve 20 by, for example, lathe processing.

  By fitting the main plate 31 of the impeller 30 to the mounting portion in which the plurality of grooves are formed, the main plate 31 is engaged with the plurality of grooves and the main plate 31 is restrained. This can improve the mounting strength. Here, as described above, since it is only necessary to form a plurality of grooves in the mounting portion 25 of the sleeve 20 by lathe processing, for example, the dimensional accuracy with the key is not required like a key groove, and a simple configuration is provided. Cost can be reduced.

  In addition to having a plurality of such grooves as the friction applying portion, a friction applying film may be formed between the grooves. Also, the friction applying portion is not limited to the above-described friction applying film and groove, but, for example, one that increases the coefficient of friction by blasting the surface of the mounting portion, or particles that increase the frictional force in the film. The following members may be mixed. The friction applying portion configured by such a friction applying film or groove may be provided on the outer peripheral surface 20 b of the sleeve 20 at a portion where the reinforcing member 34 is fitted. By doing so, the reinforcing member 34 and the sleeve can be firmly fixed. In the above description, the diameter of the entire outer peripheral surface 20b of the sleeve 20 including the attachment portion is increased as it goes from the one end side 10A to the other end side 10B, but the invention is not limited thereto. The diameter may be increased as it goes from the one end side 10A to the other end side 10B at least at the mounting portion.

DESCRIPTION OF SYMBOLS 1 pump 10 rotating shaft 10A one end side 10B other end side 20 sleeve 25 attachment part 27 friction provision part 27a friction provision film | membrane 30 impeller 31 main plate 61 groove

Claims (3)

A sleeve that is provided on the outer peripheral surface with a tapered attachment portion whose diameter increases from one end side to the other end side, and is fitted to the rotation shaft;
The shaft insertion hole into which the rotation shaft is inserted has a main plate, and a plurality of blades attached to the main plate, and the main plate includes an impeller fitted to the mounting portion,
The said attachment part is a pump provided with the friction provision part which provides a frictional force between the said main plates. In the pump according to claim 1,
The said friction provision part is a pump which has a friction provision film | membrane formed in the surface of the said attaching part. The pump according to claim 1 or 2,
The friction applying portion is a pump having a plurality of grooves formed on the surface of the mounting portion.

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