JP2021169777A - Pump device and method for disassembling pump device - Google Patents

Abstract

To provide a pump device that can reliably prevent liquid from leaking.SOLUTION: A pump device 1 includes: an impeller 6; a pump casing 7; and a pump shaft 100. The pump casing 7 includes a casing cover 11 for closing an opening end part 10a which is open in at least part of a surface on a side of a main plate 6a so as to accommodate the impeller 6 inside the pump casing. A fixing part 101 for fixing the casing cover 11 to the pump shaft 100 is formed inside the pump casing 7.SELECTED DRAWING: Figure 3

Description

The present invention relates to a pump device and a method of disassembling the pump device.

As an example of the magnet type pump device, there is known a magnet type pump device in which a drive magnet and a driven magnet are arranged so as to face each other via a casing cover.

Jikkenhei 4-84792 Gazette Japanese Unexamined Patent Publication No. 10-205482 Jikkai Sho 63-93492

Since the magnet type pump device as described above does not have a shaft sealing portion, it is particularly used for transporting a special liquid containing a slurry or a high-temperature liquid. This is because such leakage of the transport liquid affects the surrounding environment, and therefore it is necessary to prevent leakage in particular.

Therefore, an object of the present invention is to provide a pump device and a method for disassembling the pump device, which can surely prevent leakage of liquid.

In one aspect, an impeller having a main plate on which a driven magnet magnetically coupled to a magnetic rotating body fixed to a drive shaft is fixed, a pump casing accommodating the impeller, and the impeller are rotatably mounted. A pump device comprising a pump shaft is provided. The pump casing includes a casing cover that closes an opening end having at least a part of the surface on the main plate side so that the impeller can be accommodated in the pump casing, and the casing cover and the pump. A fixing portion for fixing the shaft is formed in the pump casing.

In one aspect, the fixing portion has a screw structure, and the casing cover and the pump shaft are fixed by the screw structure.
In one aspect, the screwing structure is formed on a concave female threaded portion on the impeller-side surface of the fixed portion, and is formed on the end of the pump shaft and can be screwed onto the female threaded portion. It has a male screw part.
In one aspect, the screw structure is formed on a male screw portion formed in a convex shape on the surface of the fixed portion on the impeller side, and is formed on an end portion of the pump shaft, and the male screw portion can be screwed. It has an internal thread and a female thread.

In one aspect, the pump device comprises a radial plain bearing arranged between the impeller and the pump shaft, and a ring-shaped thrust bearing arranged adjacent to the radial plain bearing. The fixed portion has a stay portion on which the thrust bearing is mounted.
In one aspect, the pumping device comprises an intermediate bracket that houses the magnetic rotating body and is connected to the pump casing.
In one aspect, a method of disassembling the pump device is provided. The magnetic force acting between the magnetic rotating body and the driven magnet separates the intermediate bracket and the casing cover that are in close contact with each other, removes the casing cover together with the impeller mounted on the pump shaft, and removes the casing cover from the pump. The shaft is removed from the fixing portion.

According to the present invention, a fixing portion for fixing the casing cover and the pump shaft is formed in the pump casing. Therefore, no through hole is formed in the casing cover. As a result, leakage of the liquid flowing into the pump casing can be prevented.

It is a figure which shows one Embodiment of a pump device. It is an enlarged view of the pump device shown in FIG. It is an enlarged view of a pump shaft. It is a figure which shows one Embodiment of the male thread part formed in the fixed part, and the female thread part formed in a pump shaft. FIG. 2 is a cross-sectional view taken along the line AA of FIG. It is a figure which shows one Embodiment of a pump casing and an intermediate bracket. It is a figure which shows the other embodiment of a pump casing and an intermediate bracket. It is a figure which shows the other embodiment of a pump casing and an intermediate bracket. It is a figure which shows the other embodiment of the plurality of through holes formed in the flange part of the intermediate bracket. FIG. 10A is a diagram showing the relationship between the size of the urging member and the size of the through hole, and FIG. 10B is a diagram showing the urging member inserted into the through hole. It is a figure which shows the drawing process of a motor casing from a pump casing. It is a figure which shows the assembly method of a pump device. It is a figure which shows the other embodiment of a pump device. It is an enlarged view of the detached part which concerns on embodiment shown in FIG. It is a figure which shows the other embodiment of the inclined part. It is a figure which shows the other embodiment of the inclined part. It is a figure which shows the other embodiment of the pump casing and the intermediate bracket which were fastened to each other.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings described below, the same or corresponding components are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a diagram showing an embodiment of a pump device. FIG. 2 is an enlarged view of the pump device shown in FIG. The pump device 1 shown in FIG. 1 is a magnet type pump device. As shown in FIGS. 1 and 2, the pump device 1 includes an impeller 6 to which a magnet (that is, a driven magnet) 5 is fixed, and a pump casing 7 for accommodating the impeller 6. The pump casing 7 includes a pump casing main body 10 in which a suction port 8 and a discharge port 9 are formed, and a casing cover 11 that closes an open end portion 10a of the pump casing main body 10.

An annular seal groove (not shown) is formed in the open end portion 10a of the pump casing main body 10, and a seal member (for example, an O-ring) 12 is mounted in the seal groove. The seal member 12 is arranged between the pump casing main body 10 and the casing cover 11 to prevent the liquid flowing into the pump casing 7 from leaking through the suction port 8.

As shown in FIG. 1, the pump device 1 is located between the drive shaft 20, the motor 21 that is the drive of the drive shaft 20, the motor casing 22 that houses the motor 21, and the motor casing 22 and the casing cover 11. It includes an arranged intermediate bracket 31 and a magnetic rotating body 23 housed in the intermediate bracket 31 and arranged so as to face the driven magnet 5. In the embodiment shown in FIG. 1, the drive shaft 20 of the motor 21 extends in the horizontal direction.

The motor casing 22 accommodates the motor 21. The intermediate bracket 31 has a cylindrical shape along the axis CL direction of the drive shaft 20.

The magnetic rotating body 23 includes a rotating flange 33 fixed to the end of the drive shaft 20 extending from the motor casing 22, and a driving magnet 34 fixed to the surface 33a of the rotating flange 33 on the pump casing side. The drive magnet 34 faces the driven magnet 5 fixed to the main plate (that is, the back surface) 6a of the impeller 6 with the casing cover 11 interposed therebetween. With such an arrangement, the lengths of the drive shaft 20 and the pump shaft 100 (described later) can be shortened, so that the pump device 1 can be made compact. The drive magnet 34 and the driven magnet 5 are composed of permanent magnets, and a magnetic force (more specifically, an attractive force) acts between the drive magnet 34 and the driven magnet 5.

The casing cover 11 closes an open end portion 10a in which at least a part of the back surface 6a side of the impeller 6 is opened so that the impeller 6 can be accommodated in the pump casing 7. As a result, the impeller 6 can be inserted into the pump casing 7 and the impeller 6 can be taken out from the pump casing 7 at the time of assembly or maintenance.

When the motor 21 is driven, the magnetic rotating body 23 rotates together with the drive shaft 20, and the rotation of the magnetic rotating body 23 rotates the impeller 6 to which the driven magnet 5 is fixed via the driven magnet 5. When the impeller 6 rotates, the liquid flows into the pump casing 7 through the suction port 8, and the liquid is discharged from the discharge port 9 in a state of being boosted.

FIG. 3 is an enlarged view of the pump shaft 100. As shown in FIG. 3, in the pump device 1, the pump shaft 100 to which the impeller 6 is rotatably mounted and the pump casing 7 are formed, and the casing cover 11 and the pump shaft 100 are detachably fixed to each other. It includes a fixing portion 101. The pump device 1 includes a radial slide bearing 103 arranged between the pump shaft 100 and the impeller 6, and a ring-shaped thrust bearing 104 arranged adjacent to the radial slide bearing 103.

During the rotation of the impeller 6, the impeller 6 slides on the radial slide bearing 103 of the pump shaft 100. As a result, the impeller 6 rotates at substantially the same center as the axis of the pump shaft 100, so that the center of the impeller 6 is suppressed from swinging due to the pulsation of the conveyed liquid, and stable liquid supply can be achieved.

As shown in FIG. 3, the fixing portion 101 has a stay portion 101a on which the thrust bearing 104 is mounted. By mounting the thrust bearing 104 on the stay portion 101a, the thrust bearing 104 is arranged between the impeller 6 and the fixing portion 101. Here, the impeller 6 that receives the force (thrust force) in the direction of the arrow F by the operation of the pump device 1 moves to the suction 8 side, and the driven magnet 5 does not come into contact with the casing cover 11. However, since the force of the arrow F is weaker than the attractive force of the drive magnet 34 during stop or start, the attractive force of the drive magnet 34 acts on the driven magnet 5 in the direction of contact with the casing cover 11. In the present embodiment, the thrust bearing 104 is arranged in order to prevent the driven magnet 5 from coming into contact with the casing cover 11 due to the attractive force of the drive magnet 34. That is, the thrust bearing 104 is arranged on the outer side in the radial direction of the pump shaft 100, and is configured to receive the attractive force of the drive magnet 34 acting on the impeller 6. As a result, it is possible to prevent the driven magnet 5 from coming into contact with the casing cover 11 due to the attractive force of the drive magnet 34. Here, as an example of the material of the thrust bearing 104, silicon carbide (SiC) or carbon can be mentioned.

The fixing portion 101 is provided on the surface 11a of the casing cover 11 on the impeller side, and the casing cover 11 is watertight so that the liquid in the pump casing 7 pressurized by the impeller 6 does not leak to the outside. It has become. The fixing portion 101 and the casing cover 11 may be integrally molded members or may be separate members.

Here, in the pump device 1, the pump shaft 100 is fixed to the fixing portion 101 by a screw structure. More specifically, as shown in FIG. 3, the fixed portion 101 is formed with a concave female threaded portion 111 on the surface 110 on the impeller side, and can be screwed into the female threaded portion 111 at the end of the pump shaft 100. Male screw portion 112 is formed. The pump shaft 100 is fixed to the casing cover 11 by screwing the male screw portion 112 of the pump shaft 100 into the female screw portion 111 of the fixing portion 101. Since the female threaded portion 111 formed in the fixed portion 101 has a concave shape, the conveyed liquid does not leak to the outside along the female threaded portion 111. The screw structure described above may be formed so as to be loosened by applying a force in the direction opposite to the rotation direction of the impeller 6. This makes it possible to prevent the screw structure from loosening during the rotation of the impeller 6.

FIG. 4 is a diagram showing an embodiment of a male screw portion 113 formed in a convex shape on the fixed portion 101 and a female screw portion 114 formed on the pump shaft 100. In one embodiment, the screwing structure is a female screw portion 113 formed on the surface 110 on the impeller 6 side of the fixing portion 101 and a female screw portion 113 formed at the end portion of the pump shaft 100 and to which the male screw portion 113 can be screwed. A unit 114 may be provided.

According to the embodiment shown in FIGS. 3 and 4, the pump shaft 100 is fixed by the fixing portion 101 without penetrating the casing cover 11. Therefore, all of the pump shaft 100 is housed in the pump casing 7, and the liquid flowing into the pump casing 7 can be prevented from leaking from the casing cover 11. In the present embodiment, the fixing portion 101 and the pump shaft 100 are fixed by a screw structure. Regardless of this, the pump shaft 100 may be fixed to the fixing portion 101 without penetrating the casing cover 11. As an embodiment, the pump shaft 100 may be fixed to the fixing portion 101 with a set screw arranged on the impeller side of the casing cover 11.

For example, the configuration shown in Patent Document 1 (Jikkaihei 4-84792) includes the following problems. The pump shaft is fixed to the casing cover by fasteners arranged on the motor casing side. The fastener is inserted into the pump shaft through a through hole formed in the casing cover. Therefore, the liquid that has flowed into the pump casing may leak to the outside through the through hole. According to the present embodiment, the fixing portion 101 is formed on the surface 11a of the casing cover 11 on the impeller side, and the casing cover 11 is formed with a hole corresponding to the through hole described in Patent Document 1. Not. Therefore, it is possible to prevent the liquid flowing into the pump casing 7 from leaking to the intermediate bracket 31 side. Therefore, in particular, the pump device 1 can be applied to an application for transporting a special liquid or a high-temperature liquid that needs to prevent leakage of the transport liquid.

Returning to FIG. 1, in the pump device 1, the suction port 8 is connected to the suction pipe SP and the discharge port 9 is connected to the discharge pipe DP at the installation site. The operator may disassemble the pump device 1 and perform maintenance work such as replacement of the impeller 6. In this case, in order to perform maintenance on the pump device 1, a method of removing the entire pump device 1 from the suction pipe SP and the discharge pipe DP can be considered. However, in such a method, if the pump device 1 is removed from the suction pipe SP and the discharge pipe DP, troubles such as deformation or breakage may occur in these pipes SP and DP.

Therefore, it is desirable to separate the motor casing 22 from the pump casing 7 together with the intermediate bracket 31 while the suction pipe SP and the discharge pipe DP are connected to the pump casing 7. However, as described above, since a strong attractive force that can rotate the impeller 6 that pressurizes the conveying liquid acts between the driving magnet 34 and the driven magnet 5, the intermediate bracket 31 and the pump casing 7 are mutually exclusive. It is firmly attached. Therefore, in order to separate the motor casing 22 from the pump casing 7, a great deal of labor and time are required to separate the attractive force.

Therefore, in the present embodiment, the pump device 1 (that is, the magnet type pump device) has a structure that separates the attractive force between the drive magnet 34 and the driven magnet 5, specifically, the motor casing 22 is easily separated from the pump casing 7. It has a separation part as a structure for the purpose. Hereinafter, the separation portion will be described.

As shown in FIGS. 1 and 2, the pump device 1 includes a separating portion 40 that separates the motor casing 22 (more specifically, the intermediate bracket 31) from the pump casing 7. In the embodiment shown in FIGS. 1 and 2, the pull-off portion 40 is formed on the intermediate bracket 31 and is an urging member (more specifically, a screw) that applies an urging force that separates the motor casing 22 from the pump casing 7. ) 41 is provided with a through hole 42 into which it can be inserted. The pulling portion 40 pulls the attractive force between the driving magnet 34 and the driven magnet 5 apart.

FIG. 5 is a cross-sectional view taken along the line AA of FIG. In FIG. 5, the magnetic rotating body 23 is not shown. As shown in FIG. 5, the separating portion 40 includes a plurality of (two in FIG. 5) through holes 42 arranged at equal intervals along the circumferential direction of the intermediate bracket 31. The intermediate bracket 31 has a tubular portion 31a in which the magnetic rotating body 23 is housed, and a flange portion 31b extending radially outward of the drive shaft 20 from the end portion of the tubular portion 31a. The through hole 42 is formed in the flange portion 31b of the intermediate bracket 31 and extends parallel to the axis CL direction of the drive shaft 20.

The flange portion 31b is formed with a connection hole 52 into which a connector 53 is inserted in order to connect the intermediate bracket 31 to the pump casing 7. The through holes 42 are arranged between the connection holes 52 adjacent to each other. In the embodiment shown in FIG. 5, the distance between the inner peripheral surface 31c of the flange portion 31b and the through hole 42 is the same as the distance between the inner peripheral surface 31c and the connection hole 52.

The plurality of through holes 42 are arranged at symmetrical positions. In the embodiment shown in FIG. 5, one of the plurality of through holes 42 is arranged outside the terminal box 120 arranged on the motor casing 22. One of the two through holes 42 is arranged in the upper part of the flange portion 31b, and the through holes 42 arranged so as to face the through holes 42 arranged in the upper part of the flange portion 31b are left and right. It is arranged below the flange portion 31b at symmetrical positions. Since one of the through holes 42 is arranged outside the terminal box 120 arranged on the motor casing 22, the through holes 42 can be easily accessed.

FIG. 6 is a diagram showing an embodiment of the pump casing 7 and the intermediate bracket 31. FIG. 6 corresponds to the portion surrounded by the broken line X in FIG. As shown in FIG. 6, the open end portion 10a of the pump casing 7 has a tapered portion 10a1. Further, the open end portion 10a of the pump casing 7 has a wall thickness such that the distance from the outer edge portion of the flange portion 31b to the bent portion 11b is T or more in order to abut the bent portion 11b of the casing cover 11. Then, it is preferable that the sealing member 12 (for example, an O-ring) for preventing the conveyed liquid from leaking is arranged between the bent portion 11b of the casing cover 11 and the tapered portion 10a1. By tightening the connector 53, it is possible to prevent the seal member 12 (O-ring) from being crushed and the liquid pressurized by the impeller 6 from leaking to the outside. In the embodiment shown in FIG. 6, the connector 53 penetrates the casing cover 11 and extends to the pump casing 7, and the through holes 42 arranged substantially concentrically with the connector 53 are formed only in the intermediate bracket 31. NS. In one embodiment, the through hole 42 may be arranged at a position facing the casing cover 11. However, if the through hole 42 is arranged at a position facing the open end portion 10a of the pump casing 7 via the casing cover 11 as shown in the present embodiment, a stronger urging force can be applied.

7 and 8 are views showing another embodiment of the pump casing and intermediate bracket. FIG. 7 is a cross-sectional view taken along the line AA of FIG. In FIG. 7, the magnetic rotating body 23 is not shown. FIG. 8 corresponds to the portion surrounded by the broken line X in FIG. Hereinafter, the same configurations as those in FIGS. 5 and 6 will be omitted. As shown in FIGS. 7 and 8, the through hole 42 is arranged closer to the inner peripheral surface 31c side of the flange portion 31b than the connection hole 52. As shown in FIG. 8, the connector 53 inserted into the connection hole 52 is arranged outside the casing cover 11, and the through hole 42 is arranged at a position where it contacts the casing cover 11. With such an arrangement, it is not necessary to form a hole in the casing cover 11 for inserting the connector 53. In the present embodiment, since the pump casing 7 and the intermediate bracket 31 are connected to the outer side, the connection can be made more firmly.

FIG. 9 is a diagram showing another embodiment of the plurality of through holes 42 formed in the flange portion 31b of the intermediate bracket 31. In FIG. 9, the connection hole 52 (and the connector 53) is not shown. In the embodiment shown in FIGS. 5 and 7, when the intermediate bracket 31 is viewed from the axis CL direction of the drive shaft 20, the pair of through holes 42 are arranged so as to face each other at the axial center and in an oblique direction. In the embodiment shown in FIG. 9, when the intermediate bracket 31 is viewed from the axis CL direction of the drive shaft 20, the pair of through holes 42 are arranged so as to face each other in the horizontal direction or the vertical direction at the positions on both sides of the terminal box 120. Has been done. By arranging the pair of through holes 42 facing the axial center, the horizontal direction, or the vertical direction, it is possible to apply an even urging force in the circumferential direction of the casing cover 11, and the pump casing cover 11 and the pump casing 7 can be applied. And / or the deformation of the intermediate bracket 31 can be prevented.

FIG. 10A is a diagram showing the relationship between the size of the urging member 41 and the size of the through hole 42, and FIG. 10B is a diagram showing the urging member 41 inserted into the through hole 42. be. In the embodiment shown in FIG. 10A, the urging member 41 is a push bolt. The through hole 42 is a screw hole having a screw groove into which the urging member 41 can be screwed.

As shown in FIG. 10A, the urging member 41 has a threaded portion 41a in which a threaded groove is formed and a head portion 41b connected to an end portion of the threaded portion 41a. The length D1 of the threaded portion 41a is larger than the length D2 of the through hole 42 (D1> D2). Therefore, when the urging member 41 is inserted into the through hole 42 until the head portion 41b of the urging member 41 comes into contact with the flange portion 31b of the intermediate bracket 31, the tip of the screw portion 41a protrudes from the through hole 42.

As shown in FIG. 10B, a hole into which the urging member 41 is inserted is not formed on the surface of the casing cover 11 facing the through hole 42. Therefore, when the urging member 41 is screwed into the through hole 42, the tip of the threaded portion 41a of the urging member 41 comes into contact with the casing cover 11. Further, by screwing the urging member 41 into the through hole 42, the intermediate bracket 31 moves to the rear side of the casing cover 11 (see the arrow in FIG. 10B), and the motor casing 22 is separated from the pump casing 7. ..

FIG. 11 is a diagram showing a process of pulling out the motor casing 22 from the pump casing 7. First, the operator removes all the fittings 53 that fasten the intermediate bracket 31 and the pump casing main body 10. As shown in "Step 1" of FIG. 11, the operator inserts the urging member 41 into the through hole 42 and screws the urging member 41 into the through hole 42 to screw the intermediate bracket 31 from the casing cover 11. Pull apart. As shown in FIG. 5, if a plurality of through holes 42 are formed, the operator can insert the urging members 41 into all the through holes 42 and screw the urging members 41 little by little to all of them. It is possible to apply an even urging force little by little in the circumferential direction of the casing cover 11, and it is possible to prevent the pump casing cover 11, the pump casing 7, and / or the intermediate bracket 31 from being deformed.

Further, in the present embodiment, the pump device 1 is fixed to the ground contact surface by the base B provided in the pump casing 7, and a strong urging force can be applied by the urging member 41. Therefore, the intermediate bracket 31 is used. It can be easily separated from the casing cover 11. As a result, the drive magnet 34 can be separated from the driven magnet 5 on which the attractive force acts.

Next, as shown in "Step 2" of FIG. 11, the operator pulls out the motor casing 22 to the rear side of the pump casing 7 along the axis CL direction of the drive shaft 20. As described above, by screwing the urging member 41 into the through hole 42, the intermediate bracket 31 is separated from the casing cover 11, so that the attractive force acting between the drive magnet 34 and the driven magnet 5 is weakened. As a result, the operator can easily pull out the motor casing 22 from the pump casing 7 in a short time without requiring a great deal of labor.

After that, the operator removes the casing cover 11 together with the impeller 6 mounted on the pump shaft 100. As described above, the pump shaft 100 is fixed to the casing cover 11 via the fixing portion 101. Therefore, the operator can remove not only the casing cover 11, but also the impeller 6 and the pump shaft 100 by removing the casing cover 11 from the pump casing main body 10. At this time, the pump casing main body 11 remains fixed to the suction pipe SP and the discharge pipe DP, and the pump device 1 of the present embodiment can be maintained without removing the pipes of the suction pipe SP and the discharge pipe DP.

After that, the operator pulls out the impeller 6 from the pump shaft 100 and removes the pump shaft 100 from the fixing portion 101. By fixing the pump shaft 100 to the casing cover 11 via the fixing portion 101 in this way, the operator can easily replace the impeller 6 and perform maintenance work by a simple method of simply removing the casing cover 11. It can be carried out.

FIG. 12 is a diagram showing a method of assembling the pump device 1. As described above, a magnetic force (that is, an attractive force) acts between the driving magnet 34 and the driven magnet 5. Therefore, when the intermediate bracket 31 is attached to the casing cover 11, when the intermediate bracket 31 is brought close to the casing cover 11 until the operator acts on the magnetic force, the intermediate bracket 31 and the casing cover 11 are strongly attracted to each other, and the operator The intermediate bracket 31 may collide with the casing cover 11 contrary to the intention of the above. As a result, the operator's fingers may be pinched between the intermediate bracket 31 and the casing cover 11.

Therefore, as shown in steps 1 and 2 of FIG. 12, the operator inserts the intermediate bracket 31 into the pump casing 7 (more specifically, the casing cover 11) with the urging member 41 inserted into the through hole 42. ), First, the urging member 41 is brought into contact with the casing cover 11. The length D1 of the threaded portion 41a of the urging member 41 is preferably longer than the combined length of the thickness of the human finger and the thickness of the flange portion 31b of the intermediate bracket 31. Then, as shown in FIG. 12, even if the urging member 41 comes into contact with the casing cover 11, the distance Da between the casing cover 11 and the flange portion 31b of the intermediate bracket 31 is larger than the thickness of a human finger. Is also big. Therefore, even if a worker's finger or the like is present in the gap between the intermediate bracket 31 and the casing cover 11 during the assembly work of the pump device 1, the operator can be placed between the intermediate bracket 31 and the casing cover 11. You can prevent your fingers from getting caught.

After that, the operator attaches the connector 53 for connecting the intermediate bracket 31 and the pump casing 7 to the intermediate bracket 31 (more specifically, the connection hole) in a state where the urging member 41 is in contact with the casing cover 11. 52) and the pump casing 7 (more specifically, the insertion hole 54).

After that, as shown in step 3 of FIG. 12, the operator pulls out the urging member 41 from the intermediate bracket 31 in a state where the pump casing 7 and the intermediate bracket 31 are loosely fastened. In this embodiment, a plurality of urging members 41 and a plurality of connecting tools 53 are provided. Therefore, the operator can alternately connect the intermediate bracket 31 and the pump casing 7 by the connector 53 and pull out the urging member 41 from the intermediate bracket 31. As a result, it becomes easy to adjust the positioning and the tightening torque in the connection work between the intermediate bracket 31 and the pump casing 7. Further, by attaching the intermediate bracket 31 to the pump casing 7 by the method shown in FIG. 12, the operator can safely assemble the pump device 1.

FIG. 13 is a diagram showing another embodiment of the pump device 1. FIG. 14 is an enlarged view of a detached portion according to the embodiment shown in FIG. Since the configuration of the present embodiment not particularly described is the same as that of the above-described embodiment, the duplicated description will be omitted.

In the above-described embodiment, the motor casing 22 is provided with a through hole 42 into which the urging member 41 can be inserted as the pulling portion 40. In the embodiment shown in FIG. 13, the motor casing 22 includes a pull-off portion 50 that is different from the pull-off portion 40. As shown in FIG. 14, the pull-off portion 50 is an inclined portion into which an urging member 51 that applies an urging force that separates the motor casing 22 from the pump casing 7 can be inserted.

The inclined portion 50 is formed on the flange portion 31b of the intermediate bracket 31. It is formed on the outermost peripheral surface 60. The flange portion 31b has an end surface 61 on the pump casing side and an end surface 62 on the bracket side, and the outermost peripheral surface 60 of the flange portion 31b is connected to the end surface 61 and the end surface 62. The end surface 61 on the pump casing side is a connecting surface of the flange portion 31b to the pump casing 7. The inclined portion 50 is formed at an end surface 61 on the pump casing side, more specifically, at a corner portion between the end surface 61 and the outermost peripheral surface 60, and is inclined from the end surface 61 toward the end surface 62.

FIG. 15 is a diagram showing another embodiment of the inclined portion 50. FIG. 16 is a diagram showing still another embodiment of the inclined portion 50. In FIGS. 15 and 16, the connection hole 52 and the connector 53 are not shown. As shown in FIG. 15, the inclined portions 50 may be a plurality of inclined portions 50 arranged at equal intervals along the circumferential direction of the intermediate bracket 31 (more specifically, the flange portion 31b). As shown in FIG. 16, the inclined portion 50 may be an annular inclined portion arranged along the circumferential direction of the intermediate bracket 31 (more specifically, the flange portion 31b).

In the embodiment shown in FIG. 15, the inclined portions 50 are arranged on both sides of the terminal box 120 as in the embodiment shown in FIG. 5, and when the intermediate bracket 31 is viewed from the axis CL direction of the drive shaft 20, when viewed from the axis CL direction of the drive shaft 20 The pair of inclined portions 50 are arranged in an oblique direction. In one embodiment, as in the embodiment shown in FIG. 9, the pair of inclined portions 50 may be arranged horizontally at positions on both sides of the terminal box 120.

By providing the inclined portion 50, a gap into which the urging member 51 can be inserted is formed between the casing cover 11 and the flange portion 31b of the intermediate bracket 31. The operator can separate the intermediate bracket 31 from the casing cover 11 by inserting an urging member (a flat-blade screwdriver in the embodiment shown in FIG. 14) 51 into this gap and using the principle of the lever. As a result, the attractive force acting between the drive magnet 34 and the driven magnet 5 becomes weak, and the operator can easily pull out the motor casing 22 from the pump casing 7 in a short time without requiring a great deal of labor. Can be done.

FIG. 17 is a diagram showing another embodiment of the pump casing 7 and the intermediate bracket 31 fastened to each other. As shown in FIG. 17, a sealing member (for example, a gasket) 12 having an annular flat plate shape may be arranged between the pump casing main body 10 and the casing cover 11. The seal member 12 is formed with a hole through which the connector 53 can penetrate, and the connector 53 penetrates the hole and extends to the pump casing main body 10.

In one embodiment, the embodiment shown in FIG. 2 and the embodiment shown in FIG. 14 may be combined. That is, the intermediate bracket 31 may include a pulling portion 40 (see FIG. 2) and a pulling portion 50 (see FIG. 14).

In the above-described embodiment, the pulling portions 40 and 50 are formed on the intermediate bracket 31. In one embodiment, at least one of the pulling portions 40, 50 may be formed on at least one of the intermediate bracket 31 and the pump casing 7 (more specifically, the casing cover 11).

Although the embodiments of the present invention have been described so far, the present invention is not limited to the above-described embodiments, and it goes without saying that the present invention may be implemented in various different forms within the scope of the technical idea.

1 Pump device 5 Driven magnet 6 Impeller 6a Main plate 7 Pump casing 8 Suction port 9 Discharge port 10 Pump casing body 10a Open end 11 Casing cover 11a Impeller side surface 11b Bent part 12 Seal member 20 Drive shaft 21 Motor 22 Motor Casing 23 Magnetic rotating body 30 Motor casing main body 31 Intermediate bracket 31a Cylindrical part 31b Flange part 31c Inner peripheral surface 33 Rotating flange 33a Pump casing side surface 34 Drive magnet 40 Separation part 41 Biasing member 41a Threaded part 41b Head 42 Penetration Hole 50 Separation part (inclined part)
51 Biasing member 52 Connection hole 53 Connector 60 Outermost peripheral surface 61 End surface on the pump casing side 62 End surface on the bracket side 100 Pump shaft 101 Fixing part 101a Stay part 103 Radial plain bearing 104 Thrust bearing 110 Face on the impeller side 111 Female thread part 112 Male threaded part 113 Male threaded part 114 Female threaded part 120 Terminal box SP Suction pipe DP Discharge pipe

Claims (7)

An impeller with a main plate fixed to a driven magnet that magnetically couples to a magnetic rotating body fixed to a drive shaft,
The pump casing that houses the impeller and
A pump shaft on which the impeller is rotatably mounted is provided.
The pump casing includes a casing cover that closes an open end portion of which at least a part of the surface on the main plate side is opened so that the impeller can be accommodated in the pump casing.
A pump device in which a fixing portion for fixing the casing cover and the pump shaft is formed in the pump casing. The fixing portion has a screw structure and has a screw structure.
The pump device according to claim 1, wherein the casing cover and the pump shaft are fixed by the screw structure. The screw structure is
A female screw portion formed in a concave shape on the impeller side surface of the fixing portion,
The pump device according to claim 2, further comprising a male screw portion formed at an end portion of the pump shaft and screwable to the female screw portion. The screw structure is
A male screw portion formed in a convex shape on the surface of the fixing portion on the impeller side,
The pump device according to claim 2, further comprising a female screw portion formed at an end portion of the pump shaft and to which the male screw portion can be screwed. The pump device
Radial plain bearings arranged between the impeller and the pump shaft,
It is provided with a ring-shaped thrust bearing arranged adjacent to the radial slide bearing.
The pump device according to any one of claims 1 to 4, wherein the fixed portion has a stay portion on which the thrust bearing is mounted. The pump device according to any one of claims 1 to 5, wherein the pump device includes an intermediate bracket that houses the magnetic rotating body and is connected to the pump casing. The method for disassembling the pump device according to claim 6.
The magnetic force acting between the magnetic rotating body and the driven magnet separates the intermediate bracket and the casing cover that are in close contact with each other.
The casing cover is removed together with the impeller mounted on the pump shaft.
A method of removing the pump shaft from the fixed portion.

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