JP5331439B2 - Bearing member and pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing member surely preventing breakaway of a bearing, and a pump. <P>SOLUTION: The pump 5 used for a pump device 1 includes a fixing groove (groove part) 38 formed on a through-hole 37 passing through a rotary shaft 6 and the bearing member 50, a bearing part (bearing) 52 engaging with the fixing groove 38 and a sleeve 51 fixed on the rotary shaft 6, and the bearing member 50 including a retainer ring 53 having interference with an inner diameter of the fixing groove 38 and formed out of same material as a pump case 30. The retainer ring 53 is fitted in the fixing groove 38 by interference fitting after the bearing part 52 is engaged with the fixing groove 38. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a bearing member and a pump, and more particularly to fixing of a bearing.

  Currently, pumps that supply liquids use bearing members to prevent wear and sag caused by sliding between the rotating shaft and the pump case, and to prevent rotational shaking of the rotating shaft. There is a method of slidably supporting a rotating shaft on a case. Such a bearing member is fixed to the pump case, and includes a bearing formed of SiC, resin, ceramic, or the like, and a sleeve fixed to the rotating shaft. By using such a bearing member for the pump and sliding the sleeve of the rotating shaft and the bearing of the pump case, the rotating shaft can be supported (supported) on the pump case.

  The method of fixing such a bearing to the pump case is a method of fixing the bearing tightly to the pump case using an adhesive or a filler, or molding and fixing with a resin (including a synthetic resin) such as a rubber agent. The method is known. As an example of such a bearing, a ceramic bearing having a sliding surface made of ceramic is known (for example, see Patent Document 1).

In this way, the bearing member prevents the bearing from being detached and rotating with the rotating shaft by tightly fixing the bearing to the pump case with an adhesive or a filler.
Japanese Patent Laid-Open No. 05-065921

  The bearing member as described above has the following problems. That is, in the method of fixing the bearing to the pump case using an adhesive or filler, if the adhesive or filler is insufficiently applied, the bearing may be detached from the pump case or rotate with the rotating shaft. There is a risk. Such detachment of the bearing is caused by movement of the bearing in the axial direction, so that the bearing and the sleeve are separated from each other. For this reason, a gap is generated between the sleeve and the pump case, and there is a possibility that the support function of the rotating shaft may be lost. In addition, when the bearing is rotated, components such as the sleeve, the bearing, and the pump case slide with each other, and there is a risk of uneven wear (wear). If loss or wear of these shaft support functions occurs, the rotating shaft may rotate with a core blur. The loss of rotation of the rotating shaft and the shaft support function accompanied by such a core blur may cause an abnormal load that is not normally applied to each component including the rotating shaft and the bearing member, and may damage the pump. .

  In the method of fixing the bearing to the pump case using an adhesive, usable adhesives are limited depending on the usage conditions and usage environment of the pump such as the purpose of use, liquid quality and liquid temperature. Furthermore, it may be difficult to fix dissimilar materials with an adhesive. In addition, when the bearing is replaced or the pump case is discarded, it is difficult to separate the pump case from the bearing, resulting in poor workability.

  With the method of molding the bearing surface with rubber etc. and fixing it to the pump case, it is difficult to mold the rubber to fix the bearing to the pump case, and it is detached from the pump case due to deterioration of the rubber due to secular change. There is also a risk.

  In addition, the method of fixing the bearing to the pump case with an adhesive, a filler, and a rubber mold has poor workability at the time of assembly, and increases the assembly process and the assembly time.

  Therefore, the present invention relates to a bearing member and a pump, and in particular, an object thereof is to provide a bearing member that can reliably prevent detachment of the bearing.

  In order to solve the above problems and achieve the object, the bearing member and the pump of the present invention are configured as follows.

An insertion hole for inserting a rotating body, and a bearing member incorporated in a casing having an annular groove having a bottom provided on an inner peripheral edge of the insertion hole facing the rotating body, the outer periphery of the rotating body A sleeve fitted into the sleeve, a cylindrical bearing having one end face opposed to the bottom portion and engaged with the groove, and an inner peripheral surface thereof slidingly in contact with the outer peripheral surface of the sleeve; and the bearing of the groove e Bei and snap ring fitted in the other end, a, said casing and said retaining ring is formed by a thermal expansion coefficient of the same metal material, wherein the groove and the retaining ring, the groove A dimensional tolerance of an inner diameter and an outer diameter of the retaining ring has an interference, and the retaining ring is fitted into the groove portion by an interference fit .

A rotating shaft connected to be rotatable by a motor, an impeller fixed to be rotatable following the rotation of the rotating shaft, a through-hole that houses the impeller and penetrates the rotating shaft, and A pump case having an annular groove having a bottom provided on an inner peripheral edge of the through-hole facing the rotating shaft, a sleeve fitted to the outer periphery of the rotating shaft, and one end face thereof facing the bottom A cylindrical bearing that is engaged with the groove and whose inner peripheral surface is in sliding contact with the outer peripheral surface of the sleeve, and a retaining ring that is fitted to the other end of the groove. e Bei a bearing member, wherein the pump case and the retaining ring are formed thermal expansion coefficient of the same metal material, wherein the groove and the retaining ring, the groove inner diameter and an outer diameter of said retaining ring Dimension tolerance has interference, and Because wheel is characterized in that fitted into the groove by interference fit

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the bearing member and pump which can prevent the detachment | desorption of a bearing reliably.

  FIG. 1 is a side view showing a partially cutout of a pump device 1 using a bearing member 50 according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view showing a configuration of a pump 5 using the bearing member 50. FIG. 3 is a cross-sectional view showing the configuration of the bearing member 50, and FIG. 4 is a top view showing the configuration of the bearing member 50. In FIG. 1, F indicates the flow of water, J indicates the storage part of the pump case 30, and K indicates the flow channel of the pump case 30.

  As shown in FIG. 1, the pump device 1 is, for example, a vertical multistage pump, and water or the like is used as a working fluid. Such a pump device 1 includes a motor 2, a first connecting member 3 connected to the motor 2, a second connecting member 4 connected to the first connecting member 3, and the second connecting member 4. A pump 5 connected to the motor 2 and a rotating shaft (rotating body) 6 that is connected to the motor 2 via the first connecting member 3 and the second connecting member 4 and constitutes a part of the pump 5 are provided.

  As the motor 2, a DC motor having a motor shaft 2a that is a rotating shaft capable of transmitting the rotational force of the motor to the outside is used.

  The first connecting member 3 includes a cylindrical bearing case 11, a first joint 12 provided in the bearing case 11, and a plurality of (three in FIG. 1) bearings 13 that pivotally support the first joint 12. And a fixture 14 for fixing the bearing 13 to the bearing case 11.

  The first joint 12 is formed in a cylindrical body having two different outer diameters, and is housed in the bearing case 11 so that the large diameter portion is disposed on the motor 2 side and the small diameter portion is disposed on the pump 5 side. Yes. The first joint 12 is formed such that the motor shaft 2a can be fixed at least in the rotational direction on the large diameter portion side. The first joint 12 has, on the small diameter side, a transmission portion 15 that can transmit the rotation of the first joint 12 to a drive body, here, a second joint 16 of a second connecting member 4 described later.

The second connecting member 4 includes a second joint 16 and a joint case 17 that houses the second joint 16 therein.
The second joint 16 is formed so as to be capable of being assembled into a cylindrical shape by integrally connecting a pair of semi-cylindrical members with bolts or the like. Moreover, the 2nd coupling 16 is formed so that the transmission part 15 and the rotating shaft 6 can be fixed by assembling cylindrical shape. Here, the method of fixing the transmission unit 15 and the rotary shaft 6 by the second joint 16 is, for example, providing a key in the transmission unit 15 and a key groove on one side of the second joint 16 and fixing the key with the key. A method of providing holes on the other side of the two joints 16 and the rotary shaft 6 and fixing them with pins may be used. Such a fixing method can be set as appropriate.

  The joint case 17 is formed so as to be fixable to the motor 2 by a bolt B via the bearing case 11. The joint case 17 is provided with a mechanical seal through which the rotary shaft 6 penetrates and between the joint case 17 and the rotary shaft 6 so that the rotary shaft 6 can rotate and slide.

  The pump 5 covers (accommodates) the rotating shaft 6, the plurality of impellers 20 fixed to the rotating shaft 6, and the impellers 20, and the plurality of pump cases (casing) 30 stacked on each other. And a liner ring 40 provided between the pump case 30 and a bearing member 50 provided between the rotary shaft 6 and the pump case 30.

  The pump 5 is connected to the lowermost pump case 30, covers the outer periphery of the flow path cover 60 that forms the suction port 61 and the discharge port 62, and the plurality of pump cases 30, and from the uppermost stage of the pump case 30. And a cylindrical discharge flow path portion 64 that forms a flow path to the discharge port 62. The suction port 61 of the flow path cover 60 forms a flow path to the pump case 30, and the discharge port 62 is blocked from the lowermost pump case 30.

  The impeller 20 is made of, for example, stainless steel or resin, and has a discharge port 21 provided on the outer peripheral side of the impeller 20, a suction port 22 provided on one main surface side (lower in FIG. 1) of the impeller 20, have.

  The pump case 30 is made of, for example, stainless steel, and has a double-bottom bowl shape having an upper bottom portion 30a and a lower bottom portion 30b, and the center side thereof is opened by a through-hole 35 and a through-hole 37 described later. . The pump case 30 is formed by a side surface of the pump case 30 and the upper bottom portion 30a, and the inside thereof is a gap provided between the storage portion J that stores the impeller 20, and the lower surface of the upper bottom portion 30a and the upper surface of the lower bottom portion 30b. And a flowing water channel K formed so as to open from the center side of the storage portion toward the outer periphery of the pump case 30. Moreover, the pump case 30 is extended from the outer peripheral side of the pump case 30 of the flowing water channel K to the inner peripheral side, and a plurality of partition walls that guide the flow of water by continuing the upper bottom portion 30a and the lower bottom portion 30b. 30c.

  When such a pump case 30 is stacked and connected, the pump case 30 is connected to the next stage from the storage portion J of the pump case 30 through the partition wall 30c of the flowing water channel K of the pump case 30 of the next stage. A continuous water flow F is formed to the storage portion J of the pump case 30.

  Further, the pump case 30 includes a convex connection part 32 provided on the upper surface of the pump case 30 and a concave connection part 33 provided on the lower surface side outer peripheral part. The pump case 30 is formed so that a plurality of stages of pump cases 30 can be connected by connecting a convex connection part 32 and a concave connection part 33 that are vertically adjacent to each other. Further, a seal groove 34 is provided in the inner peripheral portion of the convex connection portion 32 of the pump case 30, and a resin O-ring S is attached to the seal groove 34.

  The pump case 30 is provided on the upper bottom portion 30a between the storage portion J and the flowing water channel K, and the through-hole 35 spaced from the outer peripheral surface of the suction port 22 of the impeller 20 disposed in the storage portion J by a predetermined gap. And an annular fitting groove 36 provided in the inner peripheral edge portion of the through-hole 35 and provided with the liner ring 40. The pump case 30 is formed in a through hole (insertion hole) 37 that penetrates (inserts) the rotating shaft 6 and the bearing member 50, and an inner peripheral edge portion of the through hole 37, and is fixed to a bearing portion 52 that will be described later. A groove (groove portion) 38 is provided. The fixed groove 38 is formed into a cylindrical groove having a bottom portion 38a by, for example, cutting the through hole 37 from the storage portion J side. That is, the inner peripheral surface of the through hole 37 becomes the inner peripheral surface of the bottom portion 38a.

  The lower bottom portion 30b is provided on the center side of the through hole 37 and protrudes toward the storage portion J (upward), thereby having a protrusion 30d constituting the inner peripheral surface of the fixing groove 38. doing. The protrusion 30d has an upper end formed substantially at the same height as a combination of a bearing 52 and a retaining ring 53, which will be described later, and continuously from the lower bottom 30b to the upper end of the protrusion 30d with a smooth curve. Is formed.

  The liner ring 40 is disposed in the fitting groove 36, covers an annular liner ring body 41 formed of resin, a CAC-based copper alloy, and the like, and covers the liner ring body 41, and can be press-fitted into the fitting groove 36. And a cover 42 formed on the surface.

  The liner ring main body 41 has an outer diameter that is substantially the same as the inner peripheral surface of the cover 42 when the cover 42 is press-fitted into the fitting groove 36, and the outer peripheral surface of the impeller 20 on the suction port 22 side and a predetermined minute amount. It has an inner circumference that forms a gap.

  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. Since the outer diameter of the cover 42 is slightly larger than the inner diameter of the fitting groove 36 on the side surface of the press-fit cover 42, the side of the fitting groove 36 is pressed by its restoring force, and the cover 42 is fixed.

The bearing member 50 includes a sleeve 51, a bearing portion (bearing) 52, and a retaining ring 53.
The sleeve 51 is formed into a cylindrical shape from, for example, SiC (silicon carbide) ceramic, and is fixed by being fitted to the rotary shaft 6. The sleeve 51 is formed so that the inner diameter thereof is substantially the same as the outer diameter of the rotary shaft 6 so that the sleeve 51 can be fitted to the rotary shaft 6. The sleeve 51 has an outer diameter smaller than the inner diameter of the through hole 37.

  The bearing portion 52 is formed in, for example, a cylindrical shape whose inner diameter is smaller than the inner diameter of the through-hole 37 using SiC-based ceramic, and the inner peripheral surface thereof is formed so as to be slidable in contact with the sleeve 51. The bearing portion 52 is formed so that the inner peripheral diameter thereof can contact the outer peripheral surface of the sleeve 51 and is slidable, and the sleeve 51 is formed so as to be able to smoothly rotate the inner peripheral surface of the bearing portion 52. The rotary shaft 6 can be pivotally supported. That is, the bearing portion 52 has a gap (a dimensional tolerance) between the sleeve 51 and the bearing portion 52 that can slide when the sleeve 51 rotates, can be prevented from being twisted, and can be eccentric or shake when the rotating shaft 6 rotates. It is formed in a predetermined gap that does not occur. Further, the bearing portion 52 is engaged with the fixed groove 38 with one end face thereof facing the bottom portion 38a.

  The bearing portion 52 is provided with a preventing means for preventing the rotation with the rotating shaft 6. For example, a protrusion may be provided on the end surface of the bearing portion 52 that contacts the bottom 38a, a notch may be provided in the bottom 38a, and the protrusion may be prevented from engaging with the notch.

  The retaining ring 53 is made of the same material stainless steel so that the thermal expansion coefficient (thermal expansion coefficient) is substantially the same as that of the pump case 30, and the cross section thereof is formed in a square ring shape. The retaining ring 53 is fitted in the fixing groove 38 so as to face the other end face side of the bearing face 52 facing the bottom face 38a. Note that the retaining ring 53 and the pump case 30 have the same coefficient of thermal expansion by using the same material. However, the retaining ring 53 and the pump case 30 may be applied if they have substantially the same thermal expansion coefficient even if they are not the same material.

  More specifically, the retaining ring 53 has an inner diameter larger than the inner diameter of the bearing portion 52. The retaining ring 53 has an outer diameter that is substantially the same as the inner diameter of the fixed groove 38 and a dimensional tolerance that has a margin between the outer diameter and the inner diameter of the fixed groove 38. Yes.

  Such a retaining ring 53 is inserted into the fixing groove 38 with its one end face abutting against the end face of the bearing portion 52. At this time, since the outer diameter of the retaining ring 53 and the inner diameter of the fixing groove 38 are formed with a dimensional tolerance having an interference in the dimensional tolerance, they are fitted by an interference fit, for example, a cold fit.

The assembly of the retaining ring 53 and the fixing groove 38 by such a cold fit will be described.
First, the retaining ring 53 is cooled and the retaining ring 53 is contracted. Here, the retaining ring 53 may be cooled by exposing the retaining ring 53 to a thermostat set in a low temperature environment for a predetermined time, or may be cooled by dry ice or the like. That is, as long as the retaining ring 53 contracts, a cold fit by any method may be used.

  Next, the cooled retaining ring 53 is inserted (inserted) into the fixed groove 38 in which the bearing portion 52 is inserted (engaged). At this time, the end face of the retaining ring 53 is engaged with the end face of the bearing portion 52 while being in contact therewith. Since the material of the fixed groove 38 (pump case 30) and the material of the retaining ring 53 have the same coefficient of thermal expansion, the retaining ring 53 and the fixed groove 38 have an interference at the same temperature. However, since the cooled retaining ring 53 is contracted, the retaining ring 53 can be inserted into the fixing groove 38. When the end surface of the retaining ring 53 is pressed against the end surface of the bearing portion 52, the retaining ring 53 interferes with the bearing portion 52 by setting the pressure to a predetermined pressure and raising the temperature of the retaining ring 53 to room temperature while applying the pressure. Thus, the rotation of the bearing portion 52 may be prevented by the retaining ring 53.

  If the interference is large and the retaining ring 53 interferes with each other when inserted into the fixing groove 38, the fixing groove 38 is heated or the retaining ring 53 is pressed into the fixing groove 38. Also good.

  When the retaining ring 53 is engaged with the fixed groove 38, the retaining ring 53 expands by returning to normal temperature (returns to the normal temperature before cooling). Since the fixing groove 38 and the retaining ring 53 are formed with a dimensional tolerance having an interference, the retaining ring 53 is fitted into the fixing groove 38 and fixed.

  In the pump device 1 having the bearing member 50 configured as described above, when the motor shaft 2 a is rotated by the motor 2, the rotating shaft 6 is rotated from the motor shaft 2 a via the first connecting member 3 and the second connecting member 4. (Drive). When the rotating shaft 6 is driven, the impeller 20 fixed to the rotating shaft 6 also follows and rotates. By such rotation of the rotating shaft 6, water is sucked from the suction port 22 of the impeller 20, the pressure is increased, and water is discharged from the discharge port 21 of the impeller 20. In this way, the water sucked from the suction port 22 of the impeller 20 passes through the impeller 20 while increasing the pressure through the inside of the impeller 20, and is pumped as shown by the water flow F. .

  At this time, since the pressure of the water is increased by the impeller 20, a difference occurs in the pressure between the lowermost pump case 30 and the uppermost pump case 30. That is, the water sucked from the suction port 61 of the flow path cover 60 is increased in pressure by the impeller 20 of the lowermost pump case 30 and moves into the second pump case 30. Next, the increased pressure of the water is further increased in the second-stage pump case 30 and moved into the next pump case 30.

  Thus, the water repeatedly moves to the next pump case 30 while the pressure increase is repeated, and the water increased in pressure in the uppermost pump case 30 passes through the discharge flow path portion 64 to the flow path cover 60. It moves to the discharge port 62.

  During the operation of the pump device 1, the rotational force and water pressure of the rotating shaft 6 are applied to the bearing portion 52, but these external forces are applied to the bearing portion 52 and the bearing portion 52 moves in the detaching direction. Even so, it will abut against the retaining ring 53. In such a bearing member 50 used in the pump device 1, the retaining ring 53 is fixed to the fixing groove 38 by an interference fit, and the retaining ring 53 is fitted in the fixing groove. It becomes possible to prevent separation.

  Moreover, when the temperature of the pump 5 increases due to the use of the pump device 1 or when the fluid used is a high-temperature fluid, each component of the pump 5 is thermally expanded. Even in such a case, when the pump case 30 and the retaining ring 53 are formed of the same material, the thermal expansion coefficient becomes the same, and both the fixing groove 38 and the retaining ring 53 of the pump case 30 are thermally expanded. Therefore, detachment of the retaining ring 53 from the pump case 30 due to thermal expansion can be prevented. That is, it is prevented that only the pump case 30 expands and the retaining ring 53 is detached.

  For example, a case where the bearing portion is fixed only by an adhesive without using the retaining ring 53 as in the conventional technique will be described. During operation of the pump device, the rotating shaft is always rotated by the motor, and the outer peripheral surface of the sleeve provided on the rotating shaft and the inner peripheral surface of the bearing portion slide.

  However, a predetermined gap is provided between the outer diameter of the sleeve and the inner diameter of the bearing portion so that the sleeve is prevented from being twisted and is not eccentric or shaken when the rotating shaft rotates. For this reason, when the sleeve and the bearing portion slide, a rotational moment in the rotational direction is generated in the bearing portion, that is, a rotational force that rotates with the sleeve is applied to the bearing portion.

  In such a state where the rotational force is applied, there is a risk that the bearing portion may be unfixed from the fixing groove due to a decrease or loss in the adhesive function due to the usage environment and aging period of the pump device and the material of the bearing portion and the pump case. There is. Further, the thermal expansion of the pump case increases the distance between the bearing portion and the fixed groove, and the adhesive may be peeled off.

  However, by using the retaining ring 53, even if the bearing 52 is not fixed to the fixed groove 38, the retaining ring 53 is fitted in the fixed groove 38, and the retaining ring 53. Thus, it is possible to reliably prevent the bearing portion 52 from being detached from the fixed groove 38.

  Thus, by reliably preventing the bearing portion 52 from being detached, the rotating shaft 6 can be reliably supported, and core rotation of the rotating shaft 6 can be prevented. This also improves the reliability of the pump device 1. In particular, when a multi-stage pump having a plurality of impellers 20 and a pump case 30 is used as the pump device 1, the length of the rotary shaft 6 becomes longer, and as the rotary shaft 6 rotates, core blur occurs. It becomes easy to do. If the bearing 52 is detached in such a state, abnormal rotation occurs, the function of the pump device 1 is reduced or the function is stopped, and the pump device 1 may be damaged. However, by preventing the bearing portion 52 from being detached and making it possible to support the rotating shaft 6 with certainty, the function of the pump device 1 can be prevented from being lowered and the reliability of the pump device 1 can be improved.

  Further, in the maintenance of the pump device 1 and the like, when the bearing portion 52 is replaced, the bearing portion 52 can be detached from the fixed groove 38 by removing the retaining ring 53. Since the inner diameter of the bearing portion 52 is larger than the inner diameter of the retaining ring 53, the retaining ring 53 may be detached by pressing the bearing portion 52. Alternatively, only the retaining ring 53 may be partially cooled and contracted to be detached from the fixed groove 38. As described above, by removing the retaining ring 53, it is possible to easily remove and replace the bearing portion 52.

  Such detachment of the bearing portion 52 is a case where an adhesive is used as in the prior art, and when the adhesive completely fixes the bearing portion 52 and the fixed groove 38, the fixed portion 38 is detached from the fixed groove 38. There is also a possibility that the bearing portion 52 cannot be detached. Even if the bearing portion 52 can be detached, the adhesive may adhere to the fixed groove 38 and the removal operation of the bearing portion 52 may be extremely difficult. In such a case, it is necessary to replace not only the bearing portion 52 but also the pump case 30, and the maintainability deteriorates.

  However, by using the bearing member 50 using the retaining ring 53, the bearing portion 52 can be easily detached and the maintainability can be improved. That is, the pump device 1 can be easily assembled and disassembled, and the workability during manufacturing and maintenance is improved.

  Further, regarding the use of the pump device 1, since the bearing portion 52 is fixed by the retaining ring 53, there is no restriction on the working fluid and the working temperature, and the pump material 30 is used by using the same material. There are no restrictions on the conditions. For example, when used for a chemical liquid or the like, the pump case 30 is formed of a material resistant to the chemical liquid, so that the retaining ring 53 using the same material as the pump case 30 can naturally be used. Similarly, in the case of the pump device 1 used for drinking water, the retaining ring 30 is formed of the same material as the pump case 30, so that the bearing portion 52 can be fixed.

  Depending on the fluid used, the adhesive may not be used or the adhesive ability may be reduced. However, since the retaining ring 53 is not limited in use, the versatility of the pump device 1 is improved. It will also do. In addition, there is no need to change the adhesive for each fluid used, and manufacturing and management costs can be reduced.

  As described above, according to the pump device 1 using the bearing member 50 according to the present embodiment, the retaining ring 53 is securely fixed to the fixing groove 38 regardless of the fluid used in the pump device 1, thereby reliably. It is possible to prevent the bearing portion 52 from being detached. Further, the retaining ring 53 and the pump case 30 are formed of the same material, and the retaining ring 53 is fixed to the fixing groove 38 by an interference fit, so that the retaining ring 53 is securely fixed and the retaining ring 53 is detached. Can be facilitated. Thereby, workability, such as assembling / disassembling of the pump device 1, is also improved.

  The present invention is not limited to the above embodiment. For example, although the above-described pump device 1 is a vertical multistage pump, the pump apparatus 1 may be horizontal, and may not be a multistage pump, but may be a single stage pump. Even in a horizontal installation or a single-stage pump, it is possible to prevent the bearing portion 52 from being detached by the retaining ring 53 as in the pump device 1. Further, although the above-described retaining ring 53 has a ring shape with a square cross section, the retaining ring 53 may have a convex portion on the surface that contacts the bearing portion 52. In the case of the retaining ring 53 having a convex portion, a concave portion is provided on an end surface of the bearing portion 52 that contacts the retaining ring 53, and the convex portion and the concave portion are made to interfere with each other as a means for preventing rotation of the bearing portion 52. Good.

  Moreover, although the material of the pump case 30 and the retaining ring 53 described above is a material having the same thermal expansion coefficient (the same material), it is not limited thereto. For example, when the temperature of the fluid used in the pump device 1 is high, the material of the retaining ring 53 may be a material having a higher coefficient of thermal expansion than the material of the pump case 30. This is because a material having a high coefficient of thermal expansion is used for the retaining ring 53, and the retaining ring 53 is thermally expanded from the pump case 30 when the pump device 1 is used, so that the retaining ring 53 is not detached. That is, the retaining ring 53 may be a material that does not detach from the pump case 30 due to thermal expansion. However, if the coefficient of thermal expansion of the retaining ring 53 is larger than that of the pump case 30 as described above and the fluid used or the pump device 1 is at a low temperature, the retaining ring 53 may be detached. For this reason, even if the temperature of the fluid used is high, the retaining ring 53 and the pump case 30 are made of a material having substantially the same coefficient of thermal expansion in the case of a fluid and environment where the fluid may be low in use. Good.

  In addition, the above-described fitting between the fixing groove 38 and the retaining ring 53 uses a cold fit, but another fit may be used. For example, a shrink fit or a press fit fit may be used.

Further, in the above-described example, the retaining ring 53 is used for the pump device 1, but the present invention is not limited to the pump. For example, it may be a bearing member that pivotally supports a rotating body other than the pump. In addition, various modifications can be made without departing from the scope of the present invention.
Hereinafter, the invention described in the scope of claims of the present application will be appended.
[1] In a bearing member incorporated in a casing having an insertion hole into which a rotating body is inserted, and an annular groove having a bottom portion provided on an inner peripheral edge of the insertion hole facing the rotating body,
A sleeve fitted to the outer periphery of the rotating body;
A cylindrical bearing having one end face opposed to the bottom portion and engaged with the groove portion, and an inner peripheral surface thereof being in sliding contact with an outer peripheral surface of the sleeve;
A retaining ring fitted to the other end side of the bearing of the groove,
A bearing member comprising:
[2] The casing and the retaining ring are formed of a metal material having the same coefficient of thermal expansion,
The groove portion and the retaining ring have a margin in the dimensional tolerance of the inner diameter of the groove portion and the outer diameter of the retaining ring,
The bearing member according to [1], wherein the retaining ring is fitted into the groove by an interference fit.
[3] The bearing member according to [2], wherein the interference fit is a cold fit.
[4] A rotating shaft connected to be rotationally driven by a motor;
An impeller fixed to be able to rotate following the rotation of the rotating shaft;
A pump case having an annular groove portion that houses the impeller and has a through hole that allows the rotation shaft to pass therethrough, and a bottom portion that is provided on an inner peripheral edge of the through hole that faces the rotation shaft;
A sleeve fitted to the outer periphery of the rotary shaft, a cylindrical bearing whose one end surface is engaged with the groove portion facing the bottom, and whose inner peripheral surface is in sliding contact with the outer peripheral surface of the sleeve; and A bearing member having a retaining ring fitted to the other end side of the bearing of the groove,
A pump comprising:
[5] The pump case and the retaining ring are made of a metal material having the same coefficient of thermal expansion,
The groove portion and the retaining ring have a margin in the dimensional tolerance of the inner diameter of the groove portion and the outer diameter of the retaining ring,
The pump according to [6], wherein the retaining ring is fitted into the groove by an interference fit.

The side view which shows the partial notch of the pump apparatus using the bearing member in connection with one embodiment of this invention. The expanded sectional view which shows the structure of the pump using the bearing member. Sectional drawing which shows the structure of the bearing member. The top view which shows the structure of the same bearing member.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Pump apparatus, 2 ... Motor, 2a ... Motor shaft, 3 ... 1st connection member, 4 ... 2nd connection member, 5 ... Pump, 6 ... Rotary shaft, 11 ... Bearing case, 12 ... 1st coupling, 13 ... Bearings, 14 ... Fixing tools, 15 ... Transmission part, 16 ... Second joint, 17 ... Joint case, 20 ... Impeller, 21 ... Discharge port, 22 ... Suction port, 30 ... Pump case (casing), 30a ... Upper bottom part, 30b: Lower bottom part, 30c: Partition wall, 30d: Projection part, 32 ... Convex connection part, 33 ... Concave connection part, 34 ... Seal groove, 35 ... Through port, 36 ... Fitting groove, 37 ... Through hole ( Insertion hole), 38 ... Fixed groove (groove), 38a ... Bottom, 40 ... Liner ring, 41 ... Liner ring body, 42 ... Cover, 50 ... Bearing member, 51 ... Sleeve, 52 ... Bearing part (bearing), 53 ... Retaining ring, 60 ... Flow path cover, 61 ... Suction port, 62 ... Discharge , 64 ... discharge flow path section, B ... bolt, J ... storage unit, K ... flowing water channel, S ... O-ring.

Claims (3)

In a bearing member incorporated in a casing having an annular groove having an insertion hole for inserting a rotating body, and a bottom portion provided on an inner peripheral edge of the insertion hole facing the rotating body,
A sleeve fitted to the outer periphery of the rotating body;
A cylindrical bearing having one end face opposed to the bottom portion and engaged with the groove portion, and an inner peripheral surface thereof being in sliding contact with an outer peripheral surface of the sleeve;
A retaining ring fitted to the other end side of the bearing of the groove,
Bei to give a,
The casing and the retaining ring are formed of a metal material having the same coefficient of thermal expansion,
The groove portion and the retaining ring have a margin in the dimensional tolerance of the inner diameter of the groove portion and the outer diameter of the retaining ring,
A bearing member , wherein the retaining ring is fitted into the groove by an interference fit .   The bearing member according to claim 2, wherein the interference fit is a cold fit. A rotating shaft connected to be rotationally driven by a motor;
An impeller fixed to be able to rotate following the rotation of the rotating shaft;
A pump case having an annular groove portion that houses the impeller and has a through hole that allows the rotation shaft to pass therethrough, and a bottom portion that is provided on an inner peripheral edge of the through hole that faces the rotation shaft;
A sleeve fitted to the outer periphery of the rotary shaft, a cylindrical bearing whose one end surface is engaged with the groove portion facing the bottom, and whose inner peripheral surface is in sliding contact with the outer peripheral surface of the sleeve; and A bearing member having a retaining ring fitted to the other end side of the bearing of the groove,
Bei to give a,
The pump case and the retaining ring are formed of a metal material having the same coefficient of thermal expansion,
The groove portion and the retaining ring have a margin in the dimensional tolerance of the inner diameter of the groove portion and the outer diameter of the retaining ring,
The pump is characterized in that the retaining ring is fitted into the groove portion by an interference fit .

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