JP2009008002A - Casing ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a casing ring capable of certainly preventing disengagement. <P>SOLUTION: This casing ring 40 has: an annular casing ring body 41 arranged in the fitting groove 36 of a pump cover 30 and made of resin, a CAC-based copper alloy or the like; and a cover 42 covering the casing ring body 41 and also formed to be pressure-fitted to the fitting groove 36. After the casing ring body 41 is arranged in the fitting groove 36, the cover 42 is pressure-fitted into the fitting groove. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liner ring used for a pump, and more particularly to a liner ring that can prevent detachment.

  Currently, a pump for supplying a liquid such as water is provided with a liner ring between an impeller fixed to a rotary shaft of the pump and a pump cover. For example, the liner ring is fixed to a groove provided on an inner peripheral surface facing the impeller of the pump cover with an adhesive or the like with a small gap from the impeller.

  Such a liner ring is made of a metal different from the impeller in order to prevent the impeller from sticking. However, when the liner ring is made of metal, if the processing accuracy of the components such as the rotating shaft, impeller, and liner ring is poor, the liner ring and the impeller are displaced from the predetermined design position, and the gap is narrow. May occur. Due to such a wide gap between the liner ring and the impeller, there is a risk that the pump efficiency may be reduced or abnormal noise may be generated due to contact.

  Further, when the impeller and the liner ring are bonded together with a fixing agent such as an adhesive, the fixing strength is lowered due to the use environment and aging deterioration, and the liner ring may be detached from the pump cover.

  For this reason, it is known that the liner ring is made of a soft resin, or that the gap between the liner ring and the impeller can be corrected by, for example, inserting a rubber O-ring between the liner ring and the pump case. (For example, refer to Patent Documents 1 to 3).

In addition, in order to prevent such a liner ring from being detached, a method of fixing the drop-off prevention plate covering the liner ring to the pump case with a screw or the like, and preventing the rotation of the liner ring and the impeller by a pin or a non-rotating mechanism, etc. Methods are also known.
JP 2002-257082 A Japanese Patent Application Laid-Open No. 2004-169577 Japanese Utility Model Publication No. 5-57400

  The linering as described above has the following problems. That is, when an adhesive is used for fixing the liner ring, there is a possibility that the usage environment such as the liquid temperature and the liquid quality where the adhesive can be used may be limited. For this reason, depending on the usage environment, the adhesive may melt into the liquid, or the strength may be reduced, so that the liner ring may be detached from the groove of the pump cover, or the liner ring may be carried around with the impeller. It was. In particular, when the liner ring is disengaged, the gap between the impeller and the pump cover becomes wide, and liquid leakage occurs, leading to a decrease in pump performance.

  In addition, when other components are used to prevent the liner ring from being detached or to prevent rotation, the structure becomes complicated, and there is a possibility that the manufacturing cost for processing, assembly, and the like increases.

  SUMMARY OF THE INVENTION The present invention relates to a liner ring provided between a pump impeller and a pump cover. In particular, an object of the present invention is to provide a liner ring that can reliably prevent the liner ring from being detached.

  In order to solve the above problems and achieve the object, the liner ring of the present invention is configured as follows.

  An impeller that is fixed to the rotating shaft and has a liquid suction port in the axial direction, a through hole that houses the impeller and surrounds the outer periphery of the impeller on the suction port side, and the impeller suction port of the through hole In a liner ring incorporated in a pump comprising a pump case having an annular groove provided on the inner peripheral edge facing the outer peripheral part on the side, one end face of the liner ring is disposed in contact with the groove, An annular liner main body whose inner diameter is slightly larger than the outer diameter of the outer peripheral portion on the inlet side of the impeller, and at least a part of the other end surface and the outer surface of the liner ring main body, and its outer surface And a cover that is formed in a shape abutting against the inner peripheral surface of the groove and press-fitted into the groove.

  According to the present invention, it is possible to provide a liner ring provided between the impeller of the pump and the pump cover, particularly one that can reliably prevent the liner ring from being detached.

  FIG. 1 is a cross-sectional view showing a partial configuration of a pump 1 using a liner ring 40 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the liner ring 40. In addition, F in FIG. 1 has shown the flow of water. For convenience of explanation, the suction port 22 side of the impeller 20 will be described as the lower side.

  As shown in FIGS. 1 and 2, the pump 1 includes a rotating shaft 10 connected to a motor, a plurality of impellers 20 fixed to the rotating shaft 10, a plurality of pump covers 30 that respectively cover the impellers 20, and an impeller 20. And a liner ring 40 provided between the pump cover 30 and a bearing 50 provided between the rotary shaft 10 and the pump cover 30.

  The impeller 20 is formed of, for example, stainless steel or resin, and includes an ejection port 21 on the outer peripheral side of the impeller 20 and a suction port 22 on one main surface side (lower surface side in the drawing) of the impeller 20.

  The pump cover 30 is formed in a bowl shape, and includes a storage portion that stores the impeller 20 and a flowing water channel that is formed in the outer peripheral direction of the pump cover 30 from the center side of the storage portion. In addition, this flow path forms the flow F of water that is continuous with the storage portion of the other pump cover 30 when the pump cover 30 is connected.

  The pump cover 30 includes a convex connection portion 31 provided on the upper surface of the pump cover 30 and a concave connection portion 32 provided on the outer peripheral portion on the lower surface side. The convex connection portion 31 and the concave connection portion 32 are connected to each other. By connecting, the pump cover 30 can be connected in multiple stages. Further, a seal groove 33 is provided in the inner peripheral portion of the convex connection portion 31 of the pump cover 30, and a resin O-ring 34 is attached to the seal groove 33.

  The pump cover 30 includes a through hole 35 that is separated from the impeller 20 by a predetermined gap, and a through hole 38 in which the rotary shaft 10 and the bearing 50 are provided. An annular fitting groove (groove) 36 in which the liner ring 40 is provided is formed in the inner peripheral edge portion of the through hole 35. The through hole 38 is formed with a fixed groove 39 to which a bearing portion 52 described later is fixed.

  As shown in FIG. 2, the liner ring 40 is disposed in the insertion groove 36 and covers an annular liner main body 41 formed of resin, a CAC-based copper alloy or the like, and the liner ring main body 41. And a cover 42 that can be press-fitted into the groove 36.

  The liner ring main body 41 has an outer diameter substantially equal to the inner peripheral surface of the cover 42 when the cover 42 is press-fitted into the fitting groove 36, and a predetermined minute gap from the outer peripheral surface of the impeller 20 on the suction port 22 side. Has an inner peripheral diameter.

  The cover 42 is formed in an L-shaped cross-sectional shape in which a side cross-section (side surface) shape is formed in an arc shape. Further, the outer diameter of the cover 42 is formed to be slightly larger than the inner diameter of the fitting groove 36. A cover 42 indicated by a two-dot chain line indicates the cover 42 before press-fitting. Thus, when the cover 42 is press-fitted into the fitting groove 36, the side surface shape is press-fitted while being elastically deformed. For this reason, the press-fitted side surface of the cover 42 presses the side surface of the fitting groove 36 with its restoring force, and the cover 42 is fixed.

  The bearing 50 includes a sleeve 51 fixed to the rotary shaft 10, and a cylindrical bearing portion 52 in which an outer peripheral surface and an inner periphery of the sleeve 51 slide, and the bearing portion 52 is provided in the through hole 37. It is fixed to the groove 39.

  In the pump 1 using the liner ring 40 configured as described above, when the rotating shaft 10 is rotated by the motor, the impeller 20 fixed to the rotating shaft 10 also follows and rotates. By this rotation, water is sucked from the suction port 22 of the impeller 20 and water is discharged from the discharge port 21. As described above, the water passes through the impeller 20 through the impeller 20 and is pumped up as indicated by the water flow F.

  At this time, the water pressure on the upstream side of the impeller 20, that is, the rotation center side (the suction port 22 side) is lower than that on the downstream side, that is, the discharge port 21 side, and a part of the pumped water moves from the downstream to the upstream. Leakage will occur from a predetermined gap between the liner ring 40 and the impeller 20.

  The liner ring 40 is provided by press-fitting the cover 42 into the insertion groove 36, so that the cover 42 is not detached from the insertion groove 36. For this reason, the liner ring main body 41 is always covered with the cover 42, and the liner ring main body 41 is not detached from the fitting groove 36. As described above, the gap between the liner ring 40 and the impeller 20 can be maintained at a predetermined gap, and the impeller 20 can be rotated while reducing leakage.

  By using the liner ring 40 having such a configuration, the cover 42 is fixed to the fitting groove 36 by press-fitting, so that other components for fixing the cover 42 are not necessary, and only the assembly process is press-fitted. Further, since the cover 42 is elastically deformed and inserted into the insertion groove 36, a restoring force is applied to the side surface of the cover 42, and the cover 42 presses the side surface of the insertion groove 36 by this restoring force. For this reason, the cover 42 is firmly fixed to the fitting groove 36, and the liner ring body 41 is reliably prevented from being detached.

  Since detachment of the liner ring main body 41 can be reliably prevented, the leakage of the gap between the impeller 20 and the liner ring 40 can be set to the designed predetermined minimum leakage, and the pump efficiency is not reduced. .

  In addition, since the cover 42 is fixed by elastically deforming the side surface of the cover 42, the cover 42 can be fixed securely regardless of vibration, liquid temperature, and liquid quality during the operation of the pump 1, and the usable range is wide. Reliability and versatility are also improved.

  Further, since the side surface shape of the cover 42 is an arc shape, when the cover 42 is press-fitted into the insertion groove 36, the lower end of the side surface of the cover 42 can be inserted into the insertion groove 36, so that the alignment becomes easy. This also improves workability during press fitting.

  Further, since the cover 42 only needs to be a press-fit ring, and it is only necessary to press-fit the cover 42, the number of components and the manufacturing process can be reduced, and the manufacturing cost and the processing cost can be reduced.

  As described above, according to the liner ring 40 according to the present embodiment, a predetermined gap is provided between the impeller 20 and the liner ring 40 in order to securely fix the cover 42 and prevent the liner ring main body 41 from being detached. Thus, the reliability is improved without reducing the pump efficiency.

Next, a liner ring 40A according to a second embodiment of the present invention will be described with reference to FIGS.
FIG. 3 is a cross-sectional view schematically showing a partial configuration of the pump 1 using the liner ring 40A according to the modification of the present invention, and FIG. 4 is a cross-sectional view showing the liner ring 40A. 3 and 4, the same functional parts as those in FIGS.

  The liner ring 40 </ b> A includes a cover 42 and a liner ring main body 43. The liner ring main body 43 is disposed in the insertion groove 36 and the cover 42 is press-fitted into the insertion groove 36.

  The liner ring main body 43 is formed such that the outer diameter of the liner ring main body 43 is smaller than the inner diameter of the cover 42, and the thickness of the liner ring main body 43 is smaller than the height of the cover 42. Thereby, the liner ring main body 43 and the cover 42 are separated in the axial direction and the radial direction.

  The liner ring 40 </ b> A configured as described above is formed such that the outer diameter of the liner ring main body 43 is smaller than the inner diameter of the cover 42 and the thickness of the liner ring main body 43 is also thinner than the height of the cover 42. The main body 43 is in a free state. Therefore, when the pump 1 is assembled, the clearance between the impeller 20 and the liner ring 40A is uniform even when the positional accuracy of the rotary shaft 10, the impeller 20, and the liner ring 40A is poor due to the processing accuracy of each component. The liner ring main body 43 moves to the position.

  Further, even when the liner ring main body 43 comes into contact with the impeller 20 when it rotates, the cover 42 is securely fixed to the insertion groove 36, so that the liner ring main body 43 does not separate from the insertion groove 36. . For this reason, it is possible to reliably prevent an increase in leakage due to the separation of the liner ring main body 43 and a decrease in pump efficiency.

  Further, since the position of the liner ring main body 43 is formed to be movable within a certain range, the gap between the impeller 20 and the liner ring 40A becomes substantially uniform, and the impeller 20 does not interfere with the liner ring main body 43. . For this reason, when the impeller 20 rotates, it is possible to prevent contact (striking) with the liner ring main body 43 and entanglement, and it is possible to prevent reduction in efficiency due to contact. Furthermore, since the increase / decrease in efficiency due to rotation is also reduced, the operation of the pump 1 is stabilized.

  The present invention is not limited to the above embodiment. For example, the cover 42 of the above-described liner rings 40 and 40A has an arc-shaped side cross-sectional shape. However, as shown in FIG. Also good. By using such a cover 44, the shape of the cover 44 as shown by a two-dot chain line is elastically deformed by press-fitting the cover 44 into the fitting groove 36. For this reason, the cover 44 presses the side surface of the fitting groove 36 by the restoring force of the cover 44, and the cover 44 is securely fixed. Further, the cover can be applied to other shapes. That is, any shape may be used as long as the cover side is elastically deformed when the cover is press-fitted into the fitting groove 36, thereby reliably preventing the cover from being detached. In addition, various modifications can be made without departing from the scope of the present invention.

Sectional drawing which shows the partial structure of the pump using the liner ring which concerns on one embodiment of this invention. Sectional drawing which shows the liner ring. Sectional drawing which shows typically a partial structure of the pump using the liner ring which concerns on the modification of this invention. Sectional drawing which shows the liner ring. Sectional drawing which shows the liner ring which concerns on the modification of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Pump, 10 ... Rotating shaft, 20 ... Impeller, 21 ... Discharge port, 22 ... Suction port, 30 ... Pump case, 31 ... Convex connection part, 32 ... Concave connection part 33 ... Seal groove, 34 ... O-ring, 40 ... Liner ring, 41 ... Liner ring main body, 42 ... Cover, 50 ... Bearing, 51 ... Sleeve, 52 ... Bearing part, F ... Flow of water.

Claims (6)

An impeller that is fixed to the rotating shaft and has a liquid suction port in the axial direction, a through hole that houses the impeller and surrounds an outer peripheral portion on the suction port side of the impeller, and a suction port of the impeller of the through port In a liner ring incorporated in a pump comprising a pump case having an annular groove provided in an inner peripheral edge facing the outer peripheral part on the side,
An annular liner body having an inner diameter slightly larger than the outer diameter of the outer peripheral portion of the impeller on the suction port side;
A cover that covers at least a part of the other end surface and the outer surface of the liner ring main body and that has an outer surface that is in contact with the inner peripheral surface of the groove, and is press-fitted into the groove;
A liner ring characterized by comprising:   The liner ring according to claim 1, wherein the liner ring body and the cover are formed in a shape in which surfaces facing each other are separated from each other by a predetermined distance.   The liner ring according to claim 1, wherein an outer peripheral surface of the cover that is in contact with an inner surface of the groove of the cover is formed in an arc shape.   The liner ring according to claim 1, wherein the cover is made of an elastic metal.   The liner ring according to claim 1, wherein the liner ring body and the impeller are formed of materials having different mechanical properties.   The liner ring according to claim 1, wherein a material of the liner ring body is formed of a resin or a copper alloy.

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