JP6335470B2 - Sliding bearing device and pump device - Google Patents

Description

  The present invention relates to a sliding bearing device lubricated by water and a pump device provided with the sliding bearing device.

  Conventionally, as this type of sliding bearing device, for example, as shown in FIGS. 21 and 22, a bearing body 102 that is in sliding contact with a main shaft 101 that rotates in a pump casing, a housing 103 that houses the bearing body 102, and a bearing body An elastic body 104 that is provided between the outer peripheral portion of 102 and the inner peripheral portion of the housing 103 and receives the bearing body 102 in the radial direction, and a stopping means for preventing the bearing body 102 from rotating together with the main shaft 101 And 105.

  The rotation stop means 105 has a protrusion 106 and a rotation stop member 107. The protrusion 106 is provided on the bearing body 102 and protrudes in the axial direction A. The rotation stop member 107 is attached to a pair of upper and lower end covers 103 a of the housing 103 and has an insertion portion 109 made of an elastic material and opening in the axial direction A. The protrusion 106 is inserted into the insertion portion 109 from the axial direction A.

  According to this, when the main shaft 101 rotates in the predetermined rotation direction B, the outer peripheral surface of the main shaft 101 comes into sliding contact with the inner peripheral surface of the bearing body 102. At this time, the protrusion 106 is in contact with the one side surface 110 of the insertion portion 109 on the side of the main shaft rotation direction B, and is prevented from moving toward the main shaft rotation direction B. Thereby, the bearing body 102 is prevented from rotating.

  In addition, the above sliding bearing devices are described in, for example, Patent Document 1 below.

JP2010-168934

  However, in the above-described conventional format, when the main shaft 101 rotates in the predetermined rotation direction B, the protrusion 106 does not simply move in the main shaft rotation direction B but moves in the main shaft rotation direction B and the diameter. The movement in the direction C may be combined (hereinafter referred to as combined movement). This phenomenon of compound movement occurs when the main shaft 101 swings and pushes the bearing body 102, and is particularly noticeable when the bearing body 102 is operated in a so-called dry state in which it is not lubricated by water. It can be seen.

  When the protrusion 106 is combined and moved, when the protrusion 106 comes into contact with the one side surface 110 of the insertion portion 109, a force in the radial direction C acts on the one side surface 110 of the insertion portion 109. Therefore, as shown in FIG. 22, it is necessary to select the material of the rotation stop member 107 in consideration of the loads acting in the main shaft rotation direction B and the radial direction C, respectively. Specifically, a soft material is suitable for receiving a load in the radial direction C, but it is difficult to receive a load in the spindle rotation direction B, and conversely, a hard material (hard material) is used. If used, it is suitable for receiving the load in the spindle rotation direction B, but it is difficult to receive the load in the radial direction C. Therefore, it is necessary to select the material in consideration of both the radial direction C and the spindle rotation direction B. There is.

  In this case, if it is intended to sufficiently receive the load in the spindle rotation direction B with a soft material, it is necessary to enlarge the rotation member 107 in the circumferential direction as compared with the case of using a material with high hardness. The bearing device becomes larger. For this reason, in order to avoid an increase in the size of the bearing device, it is assumed that a material having a certain degree of hardness is selected as the material of the rotation stop member 107.

  An object of the present invention is to provide a sliding bearing device and a pump device that can sufficiently receive a radial load even when a material having high hardness is used for the rotation-preventing member.

To achieve the above object, the first invention is a sliding bearing device comprising a bearing body that is in sliding contact with a main shaft that rotates in a pump casing, and a housing that houses the bearing body,
A rotation stop means for preventing the bearing body from rotating together with the main shaft is provided,
The rotation stopping means has a first rotation stopping portion provided on the bearing body and a second rotation stopping portion fixed to the housing.
The first stop portion is received by the second stop portion in the main shaft rotation direction to prevent the bearing body from rotating together,
The second stop portion has a receiving portion and an outer peripheral wall portion formed on the radially outer side of the receiving portion,
The receiving portion has a receiving surface for receiving the first stop portion that is about to move in the spindle rotation direction,
When the first stop portion is received by the second stop portion and the second stop portion is pressed in the main shaft rotation direction, a radial deformation allowable gap for allowing deformation in the radial direction of the second stop portion is provided. Provided in the second stop,
The radial deformation permissible gap is formed by a cutout portion cut in the spindle rotation direction from the receiving surface, is formed at a corner where the receiving surface and the outer peripheral wall intersect, and the first stop portion is It is located on the outer side in the radial direction from the contact point between the first stop portion and the second stop portion when received by the second stop portion in the main shaft rotation direction .

  According to this, when the main shaft rotates in a predetermined rotation direction, the outer peripheral surface of the main shaft comes into sliding contact with the inner peripheral surface of the bearing body. At this time, since the first stop portion is received by the second stop portion in the main shaft rotation direction, it is possible to prevent the bearing body from rotating together with the main shaft.

  At this time, the first stop portion does not simply move in the main shaft rotation direction, but causes a movement in which the movement in the main shaft rotation direction and the movement in the radial direction are combined (hereinafter referred to as compound movement). There is. Thus, when the 1st stop part carries out a compound movement, since the deformation | transformation in the radial direction of a 2nd stop part is accept | permitted by a radial direction deformation | transformation tolerance gap, a 2nd stop part becomes easy to deform | transform into a radial direction. As a result, when the first stop portion is received by the second stop portion, the second stop portion is deformed in the radial direction to sufficiently release the radial force acting on the second stop portion. And the local distortion of the second stop portion at the contact portion where the first stop portion contacts the second stop portion is suppressed. Thereby, even if it is a case where a material with high hardness is used for the 2nd stop part, a load of a diameter direction can fully be received.

In the sliding bearing device according to the second aspect of the present invention, when the first stop portion is received by the second stop portion and the second stop portion is pressed in the main shaft rotation direction, the second stop portion is deformed in the axial direction. The axial center direction deformation | transformation tolerance clearance for accept | permitting is provided.

  According to this, when the first stop part is combined and moved, the radial deformation of the second stop part is allowed by the radial deformation allowance gap, and the deformation of the second stop part in the axial direction is the axis. Since it is permitted by the center direction deformation allowance gap, the second anti-rotation portion is easily deformed in the radial direction and the axial direction. Thereby, when the first stop portion is received by the second stop portion, the second stop portion is deformed in the radial direction and the axial direction, and the radial force acting on the second stop portion. And the axial force can be sufficiently released, and the local distortion of the second stop portion at the contact point where the first stop portion contacts the second stop portion is further suppressed.

In the sliding bearing device according to the third aspect of the invention, the first rotation stop portion is a protrusion protruding in the axial direction from the bearing body.
In the sliding bearing device according to the fourth aspect of the present invention, the first stop portion is a protrusion that protrudes radially outward from the bearing body.

The fifth invention is a pump device including the sliding bearing device according to any one of the first to fourth inventions, and can be switched between a pumping operation in which pumping is performed and a standby operation in which pumping is not performed. There is something.

  As described above, according to the present invention, when the first stop portion is received by the second stop portion, the second stop portion is deformed in the radial direction, and the radial direction acting on the second stop portion is affected. The force can be sufficiently released, and the local distortion of the second stop portion at the contact portion where the first stop portion contacts the second stop portion is suppressed. Thereby, damage to the second stop portion can be prevented, and even when a material having high hardness is used for the second stop portion, a radial load can be sufficiently received.

It is a longitudinal cross-sectional view of the pump provided with the sliding bearing apparatus in the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the impeller part of a pump same as the above. It is a longitudinal cross-sectional view of a slide bearing device. It is a top view of the bearing body of a sliding bearing apparatus equally. It is a longitudinal cross-sectional view of the bearing body of the sliding bearing device. It is an enlarged plan view of the protrusion of the sliding bearing device. It is a figure of the receiving member of a slide bearing device. It is a figure of the end cover above the housing provided with the receiving member of the slide bearing device. It is a XX arrow line view in FIG. It is a XX arrow line view in FIG. It is a partially expanded perspective view of the rotation stop means of the slide bearing device. It is the figure which looked at the rotation stop means of the sliding bearing apparatus from the radial inside, and shows the state which the protrusion part spaced apart from the receiving surface. It is the figure which looked at the rotation stop means of the sliding bearing apparatus from the radial inside, and shows the state which the protrusion contact | abutted to the receiving surface. It is a XX arrow line view in FIG. It is a figure of the edge part cover below the housing provided with the receiving member of the slide bearing device. It is XX arrow line view in FIG. It is a YY arrow line view in FIG. It is a longitudinal cross-sectional view of the slide bearing apparatus in the 2nd Embodiment of this invention. It is a top view of the bearing body of a sliding bearing apparatus equally. It is a partially expanded perspective view of the rotation stop means of the slide bearing device. It is a longitudinal cross-sectional view of the conventional sliding bearing apparatus. It is an enlarged perspective view of the rotation stop means of a slide bearing device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
In the first embodiment, as shown in FIGS. 1 and 2, reference numeral 1 denotes a vertical shaft mixed flow pump device (an example of a pump device) that can perform a prior standby operation. A suction port 3 is formed at the lower end of the pump casing 2 of the vertical shaft mixed-flow pump device 1. A main shaft 4 is inserted into the pump casing 2, and an impeller 5 is provided at the lower end of the main shaft 4. A driving device 6 such as a motor for rotating the main shaft 4 is provided above the pump casing 2.

  The main shaft 4 is supported by a plurality of plain bearing devices 11 so as to be rotatable about an axis 15. Each plain bearing device 11 is provided on a fixed member 16 provided in the pump casing 2. The pump casing 2 is provided with an intake pipe 17 that sucks air into the suction port 3. The intake pipe 17 is configured to be opened and closed by an air / water switching device 18 comprising a valve or the like. The vertical shaft mixed flow pump 1 can be switched between a pumping operation in which the impeller 5 rotates to suck up water and a standby operation (in-air operation) in which the impeller 5 rotates but does not suck up water. .

As shown in FIG. 3, the main shaft 4 is composed of a shaft body 4a and a cylindrical sleeve 4b that is externally fitted to the shaft body 4a at a bearing location.
The sliding bearing device 11 is configured as follows.

  As shown in FIG. 3, the sliding bearing device 11 includes a cylindrical bearing body 20 that rotatably holds the main shaft 4, a metal housing 21 that houses the bearing body 20, an outer peripheral portion of the bearing body 20, and a housing. The elastic body 22 is provided between the inner peripheral portion 21 and the bearing body 20 in the radial direction.

  The bearing body 20 includes a metal cylindrical shell 23 and a cylindrical sliding contact member 24 attached to the inner peripheral side of the shell 23. The slidable contact member 24 is made of, for example, ceramic, and is externally fitted to the main shaft 4, and an inner peripheral surface thereof is slidable to the sleeve 4 b of the main shaft 4.

  The housing 21 is provided on the fixing member 16 and surrounds the outer periphery of the bearing body 20. The housing 21 includes upper and lower portions provided at both ends of the body 21 a in the axial direction A (vertical direction). End covers 21b and 21c.

  The elastic body 22 includes a metal-made cylindrical holding member 26 and an elastic member 27 attached to the inner peripheral surface of the holding member 26. The holding member 26 is fitted into the body portion 21a of the housing 21 and is fixedly attached to the body portion 21a. For example, rubber or the like is used as the material of the elastic member 27.

  The bearing device 11 is provided with a rotation stop means 29 for preventing the bearing body 20 from rotating together with the main shaft 4. The rotation means 29 includes metal upper and lower protrusions 31 (an example of a first rotation stop portion), and upper and lower receiving members 32 made of an elastic material such as rubber (the second rotation stop portion). One example). The protrusion 31 is received by the receiving member 32 in the main shaft rotation direction B and prevents the bearing body 20 from rotating together.

  As shown in FIG. 4 and FIG. 5, the upper protrusions 31 are provided integrally with the shell 23 at a plurality of locations in the circumferential direction D of the upper end of the shell 23 of the bearing body 20, and upward (axial direction A One of the two). As shown in FIG. 6, both end surfaces in the circumferential direction D of each protrusion 31 are each formed in an arc shape having a radius R larger than the width W in the radial direction C of the protrusion 31. Further, the corners between the inner peripheral surface and both end surfaces of the protrusion 31 and the corners between the outer peripheral surface and both end surfaces of the protrusion 31 each have a radius r smaller than the width W of the protrusion 31. It is formed in an arc shape.

  As shown in FIGS. 7 to 10, the upper receiving member 32 is an annular member, and is fixed in the end cover 21 b above the housing 21. That is, a plurality of stop members 35 projecting radially inward are provided on the inner peripheral portion of the upper end cover 21b. These stopper members 35 are embedded in the upper receiving member 32, whereby the upper receiving member 32 is fixed in the upper end cover 21 b. The outer peripheral surface of the upper receiving member 32 is vulcanized and bonded to the inner peripheral surface of the upper end cover 21b.

  The upper receiving member 32 is formed with a plurality of concave insertion portions 36 that open to both upper and lower end surfaces (both end surfaces in the axial direction A) and the inner peripheral surface. These insertion portions 36 are formed at predetermined angles in the circumferential direction of the upper receiving member 32, and as shown in FIG. 11, the upper protrusions 31 are inserted into the insertion portions 36 from below. The upper receiving member 32 includes a receiving portion 37 formed on the insertion portion 36 in the main shaft rotation direction B side, and an outer peripheral wall portion 38 formed radially outside the inserting portion 36 and the receiving portion 37. Have.

  Between the upper end surface (one end surface in the axial direction A) of the receiving portion 37 of the upper receiving member 32 and the inner lower surface of the upper end cover 21b opposite to the upper end surface, there is an upper portion of the insertion portion 36. A first axial direction deformation permissible gap 41 that communicates is formed. Further, a second axial center direction deformation allowable gap 42 is formed between the lower end surface of the upper receiving member 32 and the upper end surface of the shell 23 of the bearing body 20. As shown in FIG. 13, the first and second axial center direction deformation allowance gaps 41 and 42 are such that the upper protrusion 31 is received by the receiving portion 37 and presses the receiving portion 37 in the main shaft rotation direction B. This is a gap for allowing deformation of the receiving portion 37 in the axial direction A.

  As shown in FIG. 11, a receiving surface 43 is formed at one end in the circumferential direction of the receiving portion 37 to receive the upper protrusion 31 that is about to move in the spindle rotation direction B. A radial deformation allowable gap 45 is formed at a corner where the receiving surface 43 and the outer peripheral wall 38 intersect. The radial deformation allowable gap 45 is for allowing deformation of the receiving portion 37 in the radial direction C when the upper protrusion 31 is received by the receiving portion 37 and presses the receiving portion 37 in the main shaft rotation direction B. It is a gap, and consists of a notch cut into the spindle rotation direction B from the receiving surface 43.

  The radial deformation allowable gap 45 is larger in diameter than the contact point P between the upper protrusion 31 and the receiving surface 43 when the upper protrusion 31 is received by the receiving surface 43 of the receiving portion 37. It is located outside in the direction. Further, the radial direction deformation allowance gap 45 penetrates the upper and lower surfaces of the receiving portion 37 in the axial direction A.

  The lower protrusion 31 and the lower receiving member 32 are members of the same material and shape as the upper protrusion 31 and the upper receiving member 32 described above. That is, as shown in FIGS. 3, 5, and 15 to 17, the lower protrusion 31 is provided integrally with the lower end of the shell 23 and protrudes downward (the other example in the axial direction A). ing. The lower receiving member 32 is fixed in the lower end cover 21c.

Hereinafter, the operation of the above configuration will be described.
As shown in FIGS. 1 and 3, when the main shaft 4 is rotated in the main shaft rotation direction B (predetermined rotation direction) by the driving device 6, the impeller 5 rotates, and at this time, the outer peripheral surface of the sleeve 4 b of the main shaft 4 is moved. The sliding contact member 24 of the bearing body 20 is in sliding contact with the inner peripheral surface. At this time, as shown in FIGS. 11 and 13, the upper and lower protrusions 31 are respectively received by receiving against the receiving surfaces 43 of the receiving portions 37 of the upper and lower receiving members 32, and the main shaft rotation direction Movement to B is blocked. For this reason, the bearing body 20 is prevented from rotating, and the bearing body 20 can be prevented from rotating together with the main shaft 4.

  At this time, when the upper protrusion 31 is combined and moved, as shown in FIG. 11, the deformation in the radial direction C of the receiving portion 37 of the upper receiving member 32 is allowed by the radial deformation allowable gap 45, As shown in FIG. 13, the deformation of the receiving portion 37 in the axial direction A (vertical direction) is allowed by the first and second axial deformation allowance gaps 41 and 42. The receiving portion 37 is easily deformed in the radial direction C and the axial direction A. Thereby, even if the upper protrusion 31 is received by the receiving portion 37 of the upper receiving member 32 and combinedly moved, the movement of the upper protrusion 31 shown in FIG. The deformation of the first and second axial direction deformation allowance gaps 41 and 42 mainly, and the movement of the upper protrusion 31 shown in FIG. 11 in the radial direction C is mainly the radial deformation. By deforming the allowable gap 45, the local distortion in the contact portion P of the receiving portion 37 and the vicinity thereof is sufficiently suppressed.

  Similarly, when the lower protrusion 31 moves in a compound manner, the deformation in the radial direction C of the receiving portion 37 of the lower receiving member 32 is allowed by the radial deformation allowable gap 45 as shown in FIG. Further, since the deformation in the axial direction A (vertical direction) of the receiving portion 37 is allowed by the first and second axial direction deformation allowable gaps 41 and 42, the receiving portion 37 of the lower receiving member 32 is It becomes easy to deform in the radial direction C and the axial direction A. Thereby, even if the lower protrusion 31 is received by the receiving portion 37 of the lower receiving member 32 and combinedly moved, the movement of the lower protrusion 31 shown in FIG. The deformation of the first and second axial direction deformation allowance gaps 41 and 42 mainly, and the movement of the lower protrusion 31 shown in FIG. 11 in the radial direction C is mainly the radial deformation. By deforming the allowable gap 45, the local distortion in the contact portion P of the receiving portion 37 and the vicinity thereof is sufficiently suppressed.

  Thereby, even if the protrusion 31 contacts and is received by the receiving surface 43 and is combined and moved, it is possible to prevent damage to the receiving portion 37 such as a crack at the contact portion P of the receiving surface 43. Even when a material having high hardness is used for the receiving member 32, the load in the radial direction C can be sufficiently received.

  When the protrusion 31 comes into contact with the receiving surface 43 and moves in combination, not only the receiving surface 43 but also the outer peripheral surface of the receiving member 32 is pulled from the inner peripheral surface of the upper end cover 21b that is vulcanized and bonded. Deformation to peel off occurs. Here, by providing the radial deformation allowance gap 45, distortion generated on the outer peripheral surface of the receiving member 32 and the inner peripheral surface of the upper end cover 21b is suppressed as compared with the case where the radial deformation allowance gap 45 is not provided. , Peeling can be prevented.

  Further, as shown in FIG. 5, the upper and lower protrusions 31 are integrally provided on the shell 23 of the bearing body 20. Here, being provided integrally means that there is no dividing surface between the shell 23 and the protrusion 31 and is formed continuously. More specifically, each protrusion is formed using a bolt or a screw. This is not a separate structure that connects the portion 31 to the shell 23. In the aspect in which each protrusion 31 is connected to the shell 23 using a bolt, a screw, or the like, a problem such as dropping due to loosening of the bolt or the screw is assumed. The attachment strength of 31 improves.

  Further, as shown in FIG. 6, since both end surfaces of each protrusion 31 are formed in an arc shape having a radius R larger than the width W of the protrusion 31, as shown in FIG. When the one end surface comes into contact with the receiving surface 43, the receiving surface 43 is deformed so as to follow the shape of the one end surface of the protrusion 31, whereby the radius R and the radius r are different from the above (for example, the radius R). Compared to the case where the width is smaller than the width W), local deformation can be suppressed.

  As an example of a pump using such a bearing device 11, as shown in FIG. 1, there is a vertical shaft mixed flow pump device 1 that performs a preliminary standby operation. At the start of operation, the air / water switching device 18 is opened to enter a standby operation. In this state, the drive device 6 is driven to gradually increase the rotational speed of the main shaft 4 to a predetermined rotational speed V. At this time, the sliding bearing device 11 is in a dry state in which the lubricating action by the self-pumped water is not exhibited.

  After the rotational speed of the main shaft 4 reaches the predetermined rotational speed V, when the water absorption level rises and reaches the set water level H, the air / water switching device 18 is closed to switch from the standby operation to the pumping operation, and the pumping is started. At this time, the sliding bearing device 11 is lubricated and cooled by the self-lifting water, so that the sliding resistance of the main shaft 4 with respect to the sliding bearing device 11 is reduced.

  After that, when it is determined that the water absorption level is lower than the set water level H and it is not necessary to continue driving the vertical shaft diagonal flow pump device 1, the air / water switching device 18 is opened, and the drive of the drive device 6 is stopped. The water in the casing 2 is discharged from the suction port 3 and the operation is stopped.

(Second Embodiment)
In the first embodiment, as shown in FIGS. 3 and 5, the protrusion 31 is protruded from the shell 23 of the bearing body 20 in the axial direction A (vertical direction). However, as the second embodiment, 18 to 20, the protrusion 31 may be protruded radially outward from the shell 23.

Even in this case, the same actions and effects as those described in the first embodiment can be obtained.
In each of the above-described embodiments, as shown in FIG. 3, the upper and lower protrusions 31 and the upper and lower receiving members 32 are provided as the rotation stopping means 29. Only one of the upper part and the lower part may be provided.

  In each of the above embodiments, as shown in FIG. 3, the main shaft 4 is constituted by the shaft main body 4a and the sleeve 4b. However, the sleeve 4b may not be provided, and the main shaft 4 may be constituted by only the shaft main body 4a.

DESCRIPTION OF SYMBOLS 1 Pump apparatus 2 Pump casing 4 Main axis | shaft 11 Sliding bearing apparatus 20 Bearing body 21 Housing 29 Rotation stop means 31 Protrusion part (1st rotation stop part)
32 Receiving member (second stop)
41, 42 Axial deformation allowance 45 A radial deformation allowance A Axial direction B Spindle rotation direction C Radial direction P Contact point

Claims (5)

A sliding bearing device comprising a bearing body that is in sliding contact with a main shaft that rotates in a pump casing, and a housing that houses the bearing body,
A rotation stop means for preventing the bearing body from rotating together with the main shaft is provided,
The rotation stopping means has a first rotation stopping portion provided on the bearing body and a second rotation stopping portion fixed to the housing.
The first stop portion is received by the second stop portion in the main shaft rotation direction to prevent the bearing body from rotating together,
The second stop portion has a receiving portion and an outer peripheral wall portion formed on the radially outer side of the receiving portion,
The receiving portion has a receiving surface for receiving the first stop portion that is about to move in the spindle rotation direction,
When the first stop portion is received by the second stop portion and the second stop portion is pressed in the main shaft rotation direction, a radial deformation allowable gap for allowing deformation in the radial direction of the second stop portion is provided. Provided in the second stop,
The radial deformation permissible gap is formed by a cutout portion cut in the spindle rotation direction from the receiving surface, is formed at a corner where the receiving surface and the outer peripheral wall intersect, and the first stop portion is A sliding bearing device , wherein the sliding bearing device is positioned radially outward from a contact portion between the first stop portion and the second stop portion when received by the second stop portion in the main shaft rotation direction . Axial deformation allowance gap for allowing deformation of the second stop in the axial direction when the first stop is received by the second stop and presses the second stop in the main shaft rotation direction. The sliding bearing device according to claim 1, wherein the sliding bearing device is provided. The sliding bearing device according to claim 1 or 2, wherein the first stop portion is a protrusion protruding in the axial direction from the bearing body . The sliding bearing device according to claim 1 or 2, wherein the first stop portion is a protrusion that protrudes radially outward from the bearing body . It is a pump apparatus provided with the sliding bearing apparatus of any one of Claim 1 to 4, Comprising: It can switch to the pumping operation which performs pumping, and the standby operation which does not pump water, It is characterized by the above-mentioned. Pump device.

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