JP2007315241A - Pump and its reinforcement outer cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the sealability of a pump chamber by sufficiently reinforcing a front casing. <P>SOLUTION: A second split outer cover 24 covering the rear side-surface of a discharge port 22 comprises a semi-cylindrical part 24a covering the rear side-surface of the discharge port 22 and a flange 24b. In the semi-cylindrical part 24a, a curved part 24e formed along the side-surface of the front casing body 20 is formed at the end 24f thereof, and a ridge 24g abutting on the end surface of a pump housing 3 is formed on the outer peripheral surface of the semi-cylindrical part 24a. A groove 24c to which the rear side of the flange 22a of the discharge port 22 is fitted is formed in the flange 24b. A chamber 24d is provided to the connection part between the inner surface of the semi-cylindrical part 24a of the second split outer cover 24 and the groove 24c, particularly at both ends thereof. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pump such as a centrifugal vortex pump in which a synthetic resin casing is reinforced with a metal reinforced exterior, and the reinforced exterior thereof.

  Conventionally, as a centrifugal vortex pump, a driven rotating body in which a driven magnet in a pump chamber is embedded is rotated by the action of a magnetic field from a driving magnet outside the pump chamber, and an impeller attached to one end of the driven rotating body is rotated. A magnet pump is known (Patent Document 1).

  In such a magnet pump, a synthetic resin may be used for a front casing and a rear casing that form a pump chamber serving as a liquid contact portion in order to enable transfer of a corrosive liquid. However, since a casing made of synthetic resin is not sufficient in strength, conventionally, a casing is reinforced by covering a metal reinforcing sheath.

  FIG. 13 is an exploded perspective view showing a reinforcing exterior of a conventional front casing, and FIG. 14 is a partially cutaway side view of the front casing with the reinforcing exterior being sheathed.

  A synthetic resin front casing 30 is formed on a cylindrical front casing body 31, a cylindrical suction port 32 formed coaxially on the front side in the axial direction of the front casing body 31, and a side surface of the front casing body 31. The cylindrical discharge port 33 is integrally formed. The front casing main body 31 is formed with an annular pump chamber 31a for generating a vortex flow of the transfer fluid therein, and with an enlarged diameter portion 31b at the rear edge. An O-ring 5 is attached inside the enlarged diameter portion 31b. A flange 32 a is formed at the tip of the suction port 32. The discharge port 33 is formed at a position shifted from the center so as to extend in the tangential direction of the vortex flow inside the pump chamber 31a, and has a flange 33a formed at the tip.

  On the other hand, the metal reinforcing armor 40 that is sheathed on the front casing 30 is usually formed of a casting, but since the front casing 30 has a complicated shape as described above, it is sheathed on the front casing 30. The reinforcing exterior 40 is divided and attached. If the discharge port 33 is located at the upper center of the front casing 30, the reinforcing exterior 40 may be divided into left and right parts. However, because of the structure in which the discharge port 33 is formed at a position shifted from the center as described above, If it is divided into two, the undercut portion 31c cannot be reinforced. For this reason, the reinforcing armor 40 is formed with a hole 41 a having a larger diameter than the flange 32 a of the suction port 32, and covers the front side surface of the front casing body 31 and the discharge port 33, and the discharge port 33. The second divided outer cover 42 that covers the rear side surface, the semi-cylindrical third divided outer cover 43A that covers the side surface on one side of the suction port 32, and the split outer case 43A are formed of the same parts, It is divided into a semi-cylindrical fourth divided exterior 43 </ b> B that covers the other side surface of the mouth 32.

And when these four division | segmentation exterior 41,42,43A, 43B is exteriorized to the front casing 30, first, the 1st division | segmentation exterior 41 is made into the front casing main body 31 so that the flange 32a may protrude from the hole 41a. The mounting is performed from the front side, and then the third and fourth divided exteriors 43A and 43B are mounted so as to be sandwiched from both side surfaces of the suction port 32. Then, the second divided exterior 42 is attached to the rear side surface of the discharge port 33.
JP 2004-285909 A

  In the pump using the reinforcing exterior 40 by the above-described 4-split exterior 41, 42, 43A, 43B, the rear side edge of the first split exterior 41 abuts on the end surface of the enlarged diameter portion 31b of the front casing 30, The rear casing 35 is pressed through an O-ring 5 mounted on the inner side of the enlarged diameter portion 31b, thereby ensuring a desired sealing performance. However, the rear-side portion of the discharge port 33 in the enlarged diameter portion 31b does not have a rear-side edge portion of the first divided exterior 41 due to the structure, and thus the O-ring 5 is not sufficiently pressed at this portion. Therefore, there is a problem that the front casing 30 is deformed by an external force or an internal force and the sealing performance is deteriorated.

  Therefore, conventionally, as shown in FIG. 10, this portion is reinforced by embedding an arc-shaped reinforcing plate 34 in the enlarged diameter portion 31b of the front casing 30 located on the rear side of the discharge port 33 by insert molding. Things have been done.

  However, when the metal reinforcing plate 34 is insert-molded in the resin molded product in this manner, the cost of the mold is increased, and so-called “sinking” or deformation occurs due to a difference in shrinkage at the time of molding. There is a problem that a defect occurs. There is also a problem that electric contact occurs when a conductor is locally disposed in a highly insulating resin casing.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a pump capable of sufficiently reinforcing a front casing and a reinforcing case thereof without insert molding metal into the front casing made of synthetic resin. To do.

  In the first pump according to the present invention, one end in the axial direction is a front side and the other end is a rear side, and an annular pump chamber for generating a vortex flow of a transfer fluid is formed inside, and the rear side is opened and opened. A cylindrical front casing body in which an enlarged diameter portion is formed at the edge of the end, and a seal member accommodating portion is formed inside the enlarged diameter portion, is coaxially formed on the front side of the front casing body, and A cylindrical suction port for introducing the transfer fluid into the pump chamber, and a discharge port formed on a side surface of the front casing body and extending in a tangential direction of the vortex of the transfer fluid in the pump chamber, and having a flange formed at the tip; A synthetic resin front casing, a first divided exterior covering the front casing body and the front side surface of the discharge port, and the discharge port A second split exterior covering the rear side surface, and a metal reinforcement exterior that is externally mounted on the front casing and reinforces the front casing, the second split exterior being a base end of the discharge port And a rear side rear surface of the flange and the second side. The rear side side surface of the flange and the second side surface of the flange are in contact with a front side end surface of the enlarged diameter portion of the front casing body. Chamfering is formed in at least one of the vicinity of the portion corresponding to the rear-side back surface of the flange of the split exterior to prevent interference when the second split exterior is attached to the front casing. Features.

  Further, the reinforcing exterior of the first pump according to the present invention is configured such that one end in the axial direction is the front side and the other end is the rear side, and an annular pump chamber for generating a vortex flow of the transfer fluid is formed inside, and the rear side is A cylindrical front casing body that is opened to form an enlarged diameter portion at the edge of the open end, and a seal member accommodating portion is formed inside the enlarged diameter section, on the front side of the front casing body. A cylindrical suction port that is coaxially formed to introduce the transfer fluid into the pump chamber and a side surface of the front casing body that extends in the tangential direction of the vortex of the transfer fluid in the pump chamber, and has a flange formed at the tip. A metal reinforcing exterior for reinforcing the front casing of a pump provided with a synthetic resin front casing formed integrally with the discharge outlet, A first split exterior covering the casing body and the front side surface of the discharge port, and a second split exterior covering the rear side surface of the discharge port, the second split exterior is formed of the discharge port. The end portion covering the base end side is externally attached to the rear side surface of the discharge port in a state of being in contact with the front side end surface of the enlarged diameter portion of the front casing body, and corresponds to the rear side rear surface of the flange. A chamfering is formed in the vicinity of the portion to be prevented in order to prevent interference when the second divided exterior is attached to the front casing.

  In the second pump according to the present invention, one end in the axial direction is a front side and the other end is a rear side, and an annular pump chamber for generating a vortex flow of a transfer fluid is formed on the inner side, and the rear side is opened and opened. A cylindrical front casing body in which an enlarged diameter portion is formed at the edge of the end, and a seal member accommodating portion is formed inside the enlarged diameter portion, is coaxially formed on the front side of the front casing body, and A cylindrical suction port for introducing the transfer fluid into the pump chamber, and a discharge port formed on a side surface of the front casing body and extending in a tangential direction of the vortex of the transfer fluid in the pump chamber, and having a flange formed at the tip; A synthetic resin front casing, a first divided exterior covering the front casing body and the front side surface of the discharge port, and the discharge port A metal reinforcing sheath that is externally covered with the front casing and reinforces the front casing, and includes the discharge port. The end portion covering the base end side of the front casing body is externally mounted on the rear side surface of the discharge port in contact with the front side end surface of the enlarged diameter portion of the front casing body. The end mounted on the side surface of the discharge port from the side surface of the pump and is rotated approximately 90 degrees to the rear side so as to be covered on the rear side surface of the discharge port, and covers the base end side of the discharge port, It is characterized in that it is chamfered to prevent interference when mounted on the front casing.

  Further, the reinforcing exterior of the second pump according to the present invention has one end in the axial direction on the front side and the other end on the rear side, and forms an annular pump chamber for generating a vortex flow of the transfer fluid on the inner side. A cylindrical front casing body that is opened to form an enlarged diameter portion at the edge of the open end, and a seal member accommodating portion is formed inside the enlarged diameter section, on the front side of the front casing body. A cylindrical suction port that is coaxially formed to introduce the transfer fluid into the pump chamber and a side surface of the front casing body that extends in the tangential direction of the vortex of the transfer fluid in the pump chamber, and has a flange formed at the tip. A metal reinforcing exterior for reinforcing the front casing of a pump provided with a synthetic resin front casing formed integrally with the discharge outlet, The casing body and a first divided exterior covering the front side surface of the discharge port, and a second divided exterior covering the rear side surface of the discharge port, the second divided exterior is a side surface of the pump It is attached to the side surface of the discharge port, and is mounted on the rear side surface of the discharge port by rotating approximately 90 degrees to the rear side, and the end portion covering the base end side of the discharge port is mounted on the front casing. It is characterized by chamfering to prevent time interference.

  According to the present invention, at least one of the vicinity of the rear side rear surface of the flange of the discharge port and the portion corresponding to the rear side rear surface of the flange of the second divided exterior is mounted on the front casing. Since chamfering for preventing interference is formed, the second divided exterior is inclined, and the second end is inserted in the groove between the discharge port and the end face of the enlarged diameter portion. Can be mounted on the side surface of the discharge port. As a result, the end portion of the second split exterior is sheathed on the rear side surface of the discharge port in contact with the front side end surface of the enlarged diameter portion of the front casing body. The front casing can be sufficiently reinforced without insert molding.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
(First embodiment)
FIG. 1 is an overall perspective view showing a magnet pump according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG.

  The magnet pump 100 includes a drive motor 1, a cylindrical pump housing 3 that accommodates the rotation shaft 2 of the drive motor 1, and a rear casing 4 joined to the front side of the inner surface of the pump housing 3. A front casing 6 joined via an O-ring (or other seal member) 5 at the front side end of the rear casing 4 and a reinforcing exterior 7 for reinforcing the front casing 6 from the outer surface. It is configured.

  Between the rear casing 4 and the front casing 6, a space sealed by both the members 4, 6 and the O-ring 5 is formed, and this space constitutes an annular pump chamber 8. One end of the spindle 9 is fixedly connected to the center in the radial direction of the rear side end face of the rear casing 4. The spindle 9 is disposed so as to penetrate partway through the pump chamber 8 along the central axis X-X ′, and the other end is fixedly connected by a holding member 6 a integrally formed on the inner side surface of the front casing 6.

  A cylindrical driven rotating body 11 is rotatably supported via a bearing 14 on the outer periphery of the axial center portion of the fixed spindle 9. An annular driven magnet 10 is embedded in the driven rotating body 11 so as to surround the outer periphery of the bearing 14. An impeller 12 is fixedly connected to the dependent rotating body 11 at the front end face.

  Inside the pump housing 3, an annular drive rotator 13 is rotatably held by the rotary shaft 2 at a position facing the outer periphery of the rear casing 4. The drive rotator 13 rotates integrally with the rotary shaft 2. The drive rotator 13 is provided with an annular drive magnet 15 so as to face the outer periphery of the driven magnet 10 through the rear casing 4. The front casing 6 includes a suction port 21 on the front side end surface in the direction of the central axis X-X ′ and a discharge port 22 on the upper side in the side surface direction.

  Hereinafter, a detailed structure of the front casing portion will be described with reference to FIGS.

  FIG. 3A is an overall perspective view showing the front casing portion viewed from the front side, and FIG. 3B is an overall perspective view showing the front casing portion viewed from the rear side. FIG. 4 is an exploded perspective view of the front casing portion. FIG. 5 is a B-B ′ arrow diagram of FIG. 3. 6A is a front view of the front casing, and FIG. 6B is a cross-sectional view taken along the line C-C ′ of FIG. Fig.7 (a) is the perspective view seen from the front side of the 2nd division | segmentation exterior, FIG.7 (b) is the perspective view seen from the rear side of the 2nd division | segmentation exterior. FIG. 8 is an overall perspective view in which a part of the second split exterior is attached to the front casing and is cut out.

  As shown in FIG. 3, the front casing portion includes a front casing 6 and a reinforcing exterior 7 that reinforces the front casing 6 from the outside. The front casing 6 is made of synthetic resin, and includes a cylindrical front casing body 20, a cylindrical suction port 21 formed coaxially with an end surface 20 c on the front side in the axial direction of the front casing body 20, and the front casing body 20. A cylindrical discharge port 22 formed on the side surface is integrally formed. The front casing body 20 is formed with an annular pump chamber 8 that generates a vortex of the transfer fluid therein, and a diameter-enlarged portion 20d formed at the rear edge. An O-ring 5 is attached to the inner side 20e of the enlarged diameter portion 20d. A flange 21 a is formed at the tip of the suction port 21. The discharge port 22 is formed at a position shifted from the center so as to extend in the tangential direction of the vortex inside the pump chamber 8, and the diameter of the distal end side is gradually increased compared to the base end side, and a flange 22 a is formed at the distal end portion. It becomes. On the rear surface of the flange 22a, as shown in FIG. 6, a groove 22b is formed on the rear side so as to extend about a half circumference except for the central width d.

  On the other hand, the metal reinforcing sheath 7 that is sheathed on the front casing 6 is formed of cast iron using aluminum die casting or the like. The reinforcing exterior 7 is composed of first to fourth divided exteriors 23, 24, 25A, and 25B and bolts (not shown) that couple them together.

  The first split outer casing 23 has a cylindrical shape with a bottom, a hole 23c having a diameter larger than that of the flange 21a of the suction port 21 is formed on the end surface 23b, and covers the front casing body 20, and a discharge on the side surface of the main body 23a. It consists of a semi-cylindrical portion 23d and a flange 23e that are formed at positions corresponding to the outlet 22 and cover the front side surface of the discharge port 22. The flange 23e is formed with a groove 23f into which the front side of the flange 22a of the discharge port 22 is fitted.

  The second divided exterior 24 covers the rear side surface of the discharge port 22 and includes a semi-cylindrical portion 24 a and a flange 24 b that cover the rear side surface of the discharge port 22. The semi-cylindrical portion 24a is formed with a curved portion 24e along the side surface of the front casing body 20 at its end 24f, and a protrusion 24g with which the end surface of the pump housing 3 abuts on the outer peripheral surface of the semi-cylindrical portion 24a. ing. In addition, a groove 24c into which the rear side of the flange 22a of the discharge port 22 is fitted is formed in the flange 24b. Furthermore, chamfering 24d is made at the both ends of the connecting portion between the inner surface of the semi-cylindrical portion 24a of the second divided outer casing 24 and the groove 24c.

  The third divided exterior 25A and the fourth divided exterior 25B are made of the same type of metal parts, and are attached to the suction port 21 so that the side surfaces are sandwiched from both sides. These divided exteriors 25A and 25B have a semi-cylindrical portion 25a, a flange 25b formed on the front side thereof, and a flange 25c formed on the rear side of the semi-cylindrical portion 25a. The flange 25b is formed with a groove 25d into which the flange 21a of the suction port 21 is fitted. The flange 25c is coupled to the end surface 23b of the first split exterior 23 by a bolt or the like.

  When the reinforcing exterior 7 configured as described above is externally mounted on the front casing 6, first, the first split exterior 23 is mounted from the front side of the front casing body 20 so that the flange 21a protrudes from the hole 23c. Then, it is fixed to the front casing body 20 with a bolt (not shown), and then the third and fourth divided exteriors 25A, 25B are fixed with bolts or the like so as to be sandwiched from both side surfaces of the suction port 21, and the divided exterior 25A, 25B and the division | segmentation exterior 23 are fixed with a volt | bolt etc. Next, the second divided exterior 24 is attached to the rear side surface of the discharge port 22. At that time, as shown in FIG. 8, the second divided exterior 24 is opened by an angle θ, and the distal end 24 f is located between the front side end face 20 f of the enlarged diameter portion 20 d of the front casing body 20 and the proximal end of the discharge port 22. After being inserted into the gap, the second divided outer casing 24 is raised, the discharge port 22 is sandwiched between the first divided outer casing 23, and both the divided outer casings 23, 24 are coupled with bolts or the like.

  In this manner, the second divided exterior 24 is fitted into the front casing 6 so that the rear surface of the flange 22a and the upper surface of the flange 24b are in contact with each other with the upper portion thereof inclined to the rear side by an angle θ. In the magnet pump according to the present invention, the groove portion 22b and the chamfered portion 24d are formed in the portions of the flanges 22a and 24b that are in contact with each other, so that the angle θ is increased without causing the two members to interfere with each other. 24 can be fitted into the front casing 6. By thus increasing the angle θ, it is possible to extend the tip 24f of the curved portion 24e of the second reinforcing exterior 24 downward from the conventional shape. Further, by extending the tip 24f of the curved portion 24e, the tip 24f is fitted into the space between the front-side end surface 20f of the enlarged diameter portion 20d and the discharge port 22, as shown in FIG. The axial stress applied to the end surface 20f when the rear casing 4 is brought into close contact can be supported by the tip 24f of the semi-cylindrical portion 24a. Thereby, a front casing can fully be reinforced without use of a reinforcement board.

In the above embodiment, the groove 22b and the chamfered portion 24d are formed on both the flanges 22a and 24b. You may make it form.
(Second Embodiment)
FIG. 9 is an exploded perspective view showing a front casing portion of a pump according to the second embodiment of the present invention.

  The characteristic of 2nd Embodiment exists in the mounting method of the 2nd division | segmentation exterior. In the first embodiment, the second divided exterior 24 is mounted on the front casing 6 from the rear side with the first, third, and fourth divided exteriors mounted on the front casing 6 and tilted upward by θ. However (FIG. 8), in 2nd Embodiment, after mounting | wearing with the 2nd division | segmentation exterior 24A to the front casing 6 first (FIG. 9), it attaches | subjects a division | segmentation exterior in order of 1st, 3rd and 4th. At this time, the second divided exterior 24A is mounted on the side surface of the discharge port 22 from the side surface of the pump, and is discharged so as to be rotated approximately 90 degrees (FIG. 12) to the rear side along the outer periphery of the discharge port 22. Arranged on the rear side of the outlet 22. The difference in configuration from the first embodiment is only that the chamfered portion 22b in the first embodiment is not formed on the back of the flange 22a of the discharge port 22 and the shape of the second divided exterior. The other components are denoted by the same reference numerals and the description thereof is omitted. Hereinafter, the shape of the second reinforcing exterior will be described.

  FIG. 10 is a perspective view of the second split exterior of the pump according to the second embodiment as viewed from the front side, and FIG. 11 is a perspective view of the second split exterior as viewed from the rear side.

  Similar to the first embodiment, the second divided exterior 24A includes a semi-cylindrical portion 24Aa and a flange 24Ab that cover the rear side surface of the discharge port 22. The semi-cylindrical portion 24Aa is formed with a curved portion 24Ae along the side surface of the front casing body 20, and a protrusion 24Ag is formed on the outer peripheral surface of the semi-cylindrical portion 24Aa. The first feature of the second embodiment is that a chamfered portion 24Ah is formed so that its thickness gradually decreases from the front end portion 24Af of the semi-cylindrical portion 24Aa to the opposite rear end side. The second feature is that the chamfer 24d in the first embodiment is not formed on the inner periphery of the flange 24Ab.

  The second divided exterior 24A configured in this way is attached to the discharge port 22 from the outer peripheral side in the rotation axis direction of the pump before the other divided exteriors 23, 25A, and 25B are attached. Is rotated approximately 90 degrees counterclockwise. Therefore, the second divided exterior 24 </ b> A is attached to the front casing 6 without interfering with the first divided exterior 23. Thereby, the process of the chamfer 24d and the chamfer 22b of both members formed in order to avoid the interference at the time of mounting on the second reinforcing exterior 24 and the front casing 6 in the first embodiment can be omitted. Further, since the chamfered portion 24Ah formed from the front end portion 24Af of the semi-cylindrical portion 24Aa to the opposite rear end side is applied to the second divided exterior 24A, as shown in FIG. And the flange 22, interference between the second divided exterior 24 </ b> A and each member can be avoided.

1 is an overall perspective view showing a magnet pump according to a first embodiment of the present invention. It is A-A 'sectional drawing of FIG. It is a perspective view which shows the front casing part of the pump which concerns on 1st Embodiment. It is a disassembled perspective view of the front casing part of the pump which concerns on 1st Embodiment. It is a B-B 'arrow diagram of FIG. It is a figure which shows the front casing of the pump which concerns on 1st Embodiment. It is the perspective view seen from the rear side of the 2nd division | segmentation exterior of the pump which concerns on 1st Embodiment. It is the whole perspective view which notched a part which shows the time of mounting | wearing to the front casing of the 2nd division | segmentation exterior of the pump which concerns on 1st Embodiment. It is a disassembled perspective view which shows the front casing part of the pump which concerns on 2nd Embodiment. It is the perspective view which looked at the 2nd division | segmentation exterior of the pump which concerns on 2nd Embodiment from the front side. It is the perspective view which looked at the 2nd division | segmentation exterior of the pump which concerns on 2nd Embodiment from the rear side. It is the figure which looked at a mode that the 2nd division exterior of a pump concerning a 2nd embodiment is installed from the upper part. It is a disassembled perspective view which shows the reinforcement exterior of the front casing in the conventional pump. It is a partial cross section figure of the state where the reinforcement exterior was covered with the front casing in the conventional pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Magnet pump, 2 ... Rotary shaft, 3 ... Pump housing, 4 ... Rear casing, 5 ... O-ring, 6, 30 ... Front casing, 7, 40 ... Reinforcement exterior, 8 ... Pump chamber, 9 ... Spindle, 10 ... Drive magnet, 11 ... driven rotor, 12 ... impeller, 13 ... drive rotor, 14 ... bearing, 15 ... drive magnet, 20, 31 ... front casing body, 21, 32 ... suction port, 22, 33 ... discharge port, 23, 41 ... 1st division reinforcement exterior, 24, 42 ... 2nd division exterior, 25, 43 ... 3rd and 4th division exterior.

Claims (4)

One end in the axial direction is the front side, the other end is the rear side, an annular pump chamber that generates a vortex of the transfer fluid is formed inside, the rear side is opened, and an enlarged diameter part is formed at the edge of the open end A cylindrical front casing body having a seal member housing portion formed inside the enlarged diameter portion, and a cylinder formed coaxially on the front side of the front casing body to introduce the transfer fluid into the pump chamber. Made of a synthetic resin, which is integrally formed with a cylindrical suction port and a discharge port formed at the side of the front casing body and extending in the tangential direction of the vortex flow of the transfer fluid in the pump chamber and having a flange formed at the tip. A front casing;
The front casing main body and the first divided exterior covering the front side surface of the discharge port, and the second divided exterior covering the rear side surface of the discharge port, the exterior casing covers the front casing. With a reinforced metal exterior to reinforce,
The second divided exterior is exteriorly provided on the rear side surface of the discharge port in a state in which an end portion covering the proximal end side of the discharge port is in contact with a front side end surface of the enlarged diameter portion of the front casing body. Is,
Interference at the time of mounting the second split exterior to the front casing is prevented at least in the vicinity of a portion corresponding to the rear side rear face of the flange and the rear side rear face of the flange of the second split exterior. A pump characterized in that a chamfer is formed. One end in the axial direction is the front side, the other end is the rear side, an annular pump chamber that generates a vortex of the transfer fluid is formed inside, the rear side is opened, and an enlarged diameter part is formed at the edge of the open end A cylindrical front casing body having a seal member housing portion formed inside the enlarged diameter portion, and a cylinder formed coaxially on the front side of the front casing body to introduce the transfer fluid into the pump chamber. Made of a synthetic resin, which is integrally formed with a cylindrical suction port and a discharge port formed at the side of the front casing body and extending in the tangential direction of the vortex flow of the transfer fluid in the pump chamber and having a flange formed at the tip. It is a metal reinforcing exterior that reinforces the front casing of the pump including the front casing,
A first split exterior covering the front casing body and the front side surface of the discharge port;
A second split exterior covering the rear side surface of the discharge port;
The second divided exterior is exteriorly provided on the rear side surface of the discharge port in a state in which an end portion covering the proximal end side of the discharge port is in contact with a front side end surface of the enlarged diameter portion of the front casing body. A chamfer is formed in the vicinity of a portion corresponding to the rear side rear surface of the flange to prevent interference when the second divided exterior is attached to the front casing. Reinforced exterior of the pump. One end in the axial direction is the front side, the other end is the rear side, an annular pump chamber that generates a vortex of the transfer fluid is formed inside, the rear side is opened, and an enlarged diameter part is formed at the edge of the open end A cylindrical front casing body having a seal member housing portion formed inside the enlarged diameter portion, and a cylinder formed coaxially on the front side of the front casing body to introduce the transfer fluid into the pump chamber. Made of a synthetic resin, which is integrally formed with a cylindrical suction port and a discharge port formed at the side of the front casing body and extending in the tangential direction of the vortex flow of the transfer fluid in the pump chamber and having a flange formed at the tip. A front casing;
The front casing main body and the first divided exterior covering the front side surface of the discharge port, and the second divided exterior covering the rear side surface of the discharge port, the exterior casing covers the front casing. With a reinforced metal exterior to reinforce,
The second divided exterior is exteriorly provided on the rear side surface of the discharge port in a state in which an end portion covering the proximal end side of the discharge port is in contact with a front side end surface of the enlarged diameter portion of the front casing body. Is,
The second divided exterior is mounted on the side surface of the discharge port from the side surface side of the pump, and is exteriorized on the rear side surface of the discharge port by rotating approximately 90 degrees to the rear side.
A pump characterized in that an end portion covering the base end side of the discharge port is chamfered to prevent interference when mounted on a front casing. One end in the axial direction is the front side, the other end is the rear side, an annular pump chamber that generates a vortex of the transfer fluid is formed inside, the rear side is opened, and an enlarged diameter part is formed at the edge of the open end A cylindrical front casing body having a seal member housing portion formed inside the enlarged diameter portion, and a cylinder formed coaxially on the front side of the front casing body to introduce the transfer fluid into the pump chamber. Made of a synthetic resin, which is integrally formed with a cylindrical suction port and a discharge port formed at the side of the front casing body and extending in the tangential direction of the vortex flow of the transfer fluid in the pump chamber and having a flange formed at the tip. It is a metal reinforcing exterior that reinforces the front casing of the pump including the front casing,
A first split exterior covering the front casing body and the front side surface of the discharge port;
A second split exterior covering the rear side surface of the discharge port;
The second divided exterior is mounted on the side surface of the discharge port from the side surface side of the pump, and is exteriorized on the rear side surface of the discharge port by rotating approximately 90 degrees to the rear side.
A reinforcing exterior of a pump, characterized in that an end portion covering the base end side of the discharge port is chamfered to prevent interference when mounted on a front casing.

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