JP2010048086A - Structure for fixing pump member and magnet in magnetically driven pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for fixing an impeller and a driven magnet in a magnetically driven pump in which the impeller and the driven magnet are easily and instantaneously fixed together. <P>SOLUTION: In a synthetic resin impeller 36 including a blade part 40, a plurality of snap arms 44 having displaceable free ends are integrally formed on the same circumference. A snap hook 48 is formed at the free end of the snap arm 44. A cylindrical driven magnet 32 is fitted to a plurality of snap arms 44 from the outside. The snap hooks 48 of the snap arms 44 are engaged with the driven magnet 32 with the driven magnet 32 abutted on a stopper. The snap arms 44 are engaged with the snap hooks 48 so that the driven magnet 32 is prevented from moving in the opposite direction of the advancing direction thereof. Thus, the driven magnet 32 is fixed to the impeller 36. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure for fixing a pump member and a magnet in a magnetic drive pump that transmits power via a magnet.

  As a main thing which transmits motive power with a magnet, a magnet coupling type impeller pump etc. are known. In a magnet coupling type impeller pump, the impeller is generally fixed to a driven magnet. As methods for fixing the driven magnet and the impeller, there are known an insert molding method (Patent Document 1) in which the driven magnet is inserted into the impeller and molded, and a method in which the driven magnet and the impeller are bonded together with an adhesive.

JP-A-5-296178

  In the insert molding method, the magnet may break due to the resin pressure during molding. In addition, there is a drawback in that it takes a lot of work because each magnet is manually inserted into the resin mold. Further, the temperature of the resin or mold may be lowered or unstable by the magnet, and the dimensions of the finished product may not be uniform.

  On the other hand, the method of fixing the driven magnet and the impeller by filling the adhesive not only requires time to solidify the adhesive, but also requires equipment such as heating means and complicated processes, and is fixed. There is a problem that it takes drying time and equipment cost.

  The present invention has been made in view of the above problems, and provides a fixing structure for a pump member and a magnet in a magnetic drive pump that can easily fix a pump member such as an impeller and a driven magnet instantaneously. It is for the purpose.

  The structure for fixing the pump member and the magnet in the magnetic drive pump according to the present invention includes a drive magnet rotated by the drive means, a cylindrical driven magnet rotated in accordance with the rotation of the drive magnet, and the driven magnet. In the magnetic drive pump having a pump member to be fixed, the pump member is integrally formed with one or more snap arms extending in the axial direction at the same circumferential position around the rotation center axis thereof, and the snap Locking means that protrudes outward from the outer surface of the snap arm is provided at or near the free end of the arm, the free end of the snap arm or the vicinity of the free end can be displaced by an external force, and the cylindrical driven magnet is The locking means engages with the driven magnet when fitted on the outside of one or more snap arms. It is characterized in that to fix the driven magnet member for the pump. The present invention is characterized in that one or more anti-rotation bosses that contact the adjacent snap arms are provided inward from the inner wall of the cylindrical driven magnet. The present invention provides the pump member with a plurality of the snap arms at the same circumferential position around the rotation center axis of the pump member, and between the plurality of snap arms and at the circumferential position, the cylindrical shape. An inner surface guide that is in contact with the inner wall of the driven magnet and is formed integrally with the pump member is provided, and the free end of the inner surface guide is not displaced by an external force. The present invention is characterized in that one or more anti-rotation bosses that contact the adjacent snap arm and the inner surface guide are provided inward from the inner wall of the cylindrical driven magnet. According to the present invention, a locking recess that is locked by the locking means is provided at a position on one end face side of the inner wall of the driven magnet, and when the locking means is locked in the locking recess, the engagement The stopping means does not protrude outward from one end face of the driven magnet. According to the present invention, first anti-rotation engaging means is formed on the pump member, and second anti-rotation engaging means for engaging the first anti-rotation engaging means is provided on the driven magnet. It is characterized by.

  The structure for fixing the pump member and the magnet in the magnetic drive pump according to the present invention includes a drive magnet rotated by the drive means, a cylindrical driven magnet rotated in accordance with the rotation of the drive magnet, and the driven magnet. In a magnetic drive pump having a pump member to be fixed, a cylindrical part is integrally formed in the axial direction at the same circumferential position around the rotation center axis of the pump member, and is engaged with an inner wall of the cylindrical part. One or more extending | stretching axially to the circumferential position which forms the recessed part for a stop, is equipped with the cyclic | annular connection member larger diameter than the internal diameter of the said cylindrical driven magnet, and the said connection member has a cyclic | annular center position center. A snap arm is provided, and a locking means that protrudes outward from the outer surface of the snap arm is provided at or near the free end of the snap arm. The free end of the arm or the vicinity of the free end can be displaced by an external force, the driven magnet is fitted to the outside of the cylindrical portion, and then the one or more snap arms of the connecting member are fitted to the inside of the cylindrical portion. When combined, the locking means locks in the locking recess of the cylindrical portion to fix the connecting member and the pump member, and the driven magnet is formed by the connecting member and the pump member. It is characterized in that it does not move by pinching. According to the present invention, a locking recess that is locked by the locking means is provided at a position on one end face side of the inner wall of the driven magnet, and when the locking means is locked in the locking recess, the engagement The stopping means does not protrude outward from one end face of the driven magnet.

  In the first and second embodiments of the present invention, the pump member and the driven magnet can be fixed simply by fitting the pump member and the driven magnet. In Embodiment 3 of the present invention, after the pump member and the driven magnet are fitted, the pump member and the driven magnet can be fixed simply by fitting the connecting member to the pump member. . As described above, in the present invention, the working time for fixing the pump member and the driven magnet and the time required for fixing can be greatly shortened compared with the conventional one, and the working cost can be greatly reduced. is there. As a result, the present invention has the disadvantages of the conventional fixing method by bonding (it takes time to fix and requires equipment costs), and the disadvantage of the conventional insert molding method (the possibility of breakage of the magnets and uniform dimensions of the finished product). Can not be solved).

  In the present invention, the driven magnet and the pump member can be easily fixed by simply locking the locking means provided on the snap arm to a predetermined member.

  Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a first embodiment of a fixing structure of a pump member and a magnet in a magnetic drive pump according to the present invention, and FIG. 2 is a perspective view of a main part of FIG. The magnetic drive pump 10 includes a pump body 14 having a motor 12 as a driving means therein, a front casing 18 and a rear casing 20 for forming a pump chamber 16, and the pump body sandwiching the rear casing 20 therebetween. 14 and the front casing 18 are fixed by fixing means 22 such as bolts, for example, so that the pump body 14, the front casing 18, and the rear casing 20 are fixed. A partition housing 24 that partitions the motor 12 side and the rear casing 20 side is attached to the inside of the pump body 14, and a space 26 is formed by the rear casing 20 and the partition housing 24.

  The rear casing 20 is made of synthetic resin, for example, and a central portion thereof is a cup-shaped bottomed cylindrical portion 28 that protrudes toward the space 26 side. A cup-shaped drive magnet 32 is fixed to the rotating shaft 30 of the motor 12, and the drive magnet 32 is disposed in the space 26. The drive magnet 32 is set and arranged outside the cup-shaped bottomed cylindrical portion 28 so as to cover the bottomed cylindrical portion 28 in a non-contact state. The drive magnet 32 has a cup shape, but may have a cylindrical portion (in that case, the holding magnet is fixed to the rotating shaft 30 of the motor 12 and holds the cylindrical drive magnet). Is not necessarily in the shape of a cup. On the pump chamber 16 side of the bottomed cylindrical portion 28 of the rear casing 20, a synthetic resin impeller 36 as a pump member is rotatably held. The description of the structure that holds the impeller 36 rotatably on the rear casing 20 is omitted here. The rear casing 20 keeps the pump chamber 16 and the space 26 in an airtight state so that liquid does not enter the drive magnet 32 side. As the pump member, in addition to the impeller 36, those used for various pumps such as a power transmission shaft, a drive cam, and a plunger can be considered.

  As shown in FIG. 1 and FIG. 2, the impeller 36 includes a disk-shaped impeller base 38, a blade part 40 formed integrally with the impeller base 38, and the side opposite to the blade part 40 from the center of the impeller base 38. And a central post portion 42 extending in the vertical direction. The impeller 36 is further formed integrally with the impeller base 38 and includes one or more snap arms 44 and a plurality of inner surface guides 46 arranged parallel to the central column 42 and outside the central column 42. Have. In the example shown in FIG. 2, the snap arms 44 extend from the impeller base 38 in the direction of the rotation axis of the impeller 36, and a total of four snap arms 44 are arranged at equal intervals around the rotation axis of the impeller 36 in the same circumferential direction. A total of four inner surface guides 46 are arranged at equal intervals in the same circumferential direction, arranged between adjacent snap arms 44. A snap hook 48 is integrally formed at the free end of each snap arm 44 or in the vicinity of the free end as a locking means that protrudes outward from the outer circumferential surface of the snap arm 44.

  At the base of each snap arm 44 (connection position with the impeller base 38), a protruding portion 50 as a first anti-rotation engaging means that protrudes outward in the circumferential direction is integrally formed. The inner and outer walls of each snap arm 44 up to the free end face the space. For this reason, the free end of each snap arm 44 can be moved when an external force is applied in the normal direction to the circumferential direction (the same circumferential direction in which four are arranged at equal intervals). Each inner surface guide 46 is fixed to the central support column 42, and the free end of each inner surface guide 46 is set so as not to move by an external force unlike the free end of the snap arm 44.

  The power transmission means of the magnetic drive pump 10 is composed of a drive magnet 32 and a driven magnet 52 paired therewith. As shown in FIG. 2, the driven magnet 52 has a cylindrical shape, and the inner diameter of each of the four outer circumferential guide walls of the snap arms 44 arranged in the circumferential direction and the inner guide 46 arranged four. It is set to a dimension that fits and contacts the outer wall in the circumferential direction. In the driven magnet 52, a first recess 54 is formed on one end side of the inner wall 53 as a second engaging means for preventing rotation to be fitted to the base protrusion 50 of each snap arm 44. On the end side, a second recess 56 is formed as a locking recess for locking the snap hook 48 at the free end of each snap arm 44. The number of first recesses 54 and the number of second recesses 56 are the same as the number of snap arms 44.

  In the magnetic drive pump 10, as will be described later, a cylindrical driven magnet 52 is fixed to the impeller 36, and the outer surface of the cylindrical driven magnet 52 faces the drive magnet 32 across the bottomed cylindrical portion 28. Be placed.

  As shown in FIG. 3A, the distance between the farthest outer edges of the two snap hooks 48 on the opposite side of 180 degrees out of the four snap arms 44 is L, and the inner diameter of the driven magnet 52 Is D, the distance L is greater than the inner diameter D. The distance M of the outermost edge of the snap hook 48 can be reduced from the inner diameter D of the driven magnet 52 so that the tip of the snap hook 48 can enter the internal space of the cylindrical driven magnet 52. And

  When the impeller 36 and the driven magnet 52 are fixed, the plurality of snap arms 44 and the plurality of inner surface guides 46 (from the side where the first concave portion 54 is formed, as shown in FIG. It is moved in the A direction so as to be fitted from outside (not shown in FIG. 3). During the assembly of the driven magnet 52, the inner diameter D of the driven magnet 52 is smaller than the distance L between the outer edges of the two snap hooks 48 on the opposite side of 180 degrees, but the impeller 36 is made of synthetic resin. Since the free end (position where the snap hook 48 is formed) of the snap arm 44 can be displaced, as shown in FIG. 3B, the distance between the outer edges of the two snap hooks 48 that are 180 degrees opposite to each other is D is brought into contact with the inner wall 53 of the driven magnet 52, and the driven magnet 52 can be moved relative to the impeller 36 while keeping the snap hook 48 in contact with the inner wall 53 of the driven magnet 52.

  As illustrated in FIG. 3C, the driven magnet 52 stops moving when the driven magnet 52 comes into contact with the impeller base 38. That is, the impeller base 38 serves as a stopper. In a state where the insertion-side end surface 58 of the driven magnet 52 is in contact with the impeller base portion 38, the base protruding portion 50 of the snap arm 44 and the first concave portion 54 of the driven magnet 52 are fitted, and the driven magnet 52 is against the impeller 36. It does not rotate in the axial direction. The snap hook 48 at the free end of the snap arm 44 is locked to the second recess 56. That is, the snap hook 48 which is the free end of the snap arm 44 is released from the compression by the location of the inner diameter D of the driven magnet 52, and the distance between the outer edges of the two snap hooks 48 on the opposite side of 180 degrees is the original distance. L. As described above, the snap hook 48 of the snap arm 44 is engaged with the second recess 56 of the driven magnet 52, so that the driven magnet 52 can move in the B direction (FIG. 3B) with respect to the impeller 36. As a result, the driven magnet 52 is fixed to the impeller 36. Further, in a state where the snap hook 48 is locked to the second recess 56, the snap hook 48 is set so as not to protrude from the end surface of the driven magnet 52 on the second recess 56 side. By preventing the snap hook 48 from protruding outward from the end surface of the driven magnet 52 on the second recess 56 side, the axial length of the magnetic drive pump 10 can be shortened.

  As described above, according to the first embodiment of the present invention, the snap hook 48 of the snap arm 44 is engaged with the driven magnet 52, the snap arm 44 of the impeller 36, and the inner surface guide 46, so that the second of the driven magnet 52 is engaged. Locks into the recess 56. Due to this locking, the driven magnet 32 cannot move in the direction opposite to the traveling direction, and the driven magnet 32 is fixed to the impeller 36. As a result, the present invention has the disadvantages of the conventional fixing method by bonding (it takes time to fix and costs equipment costs), and the disadvantage of the insert molding method (the possibility of breaking the magnet, and the dimensions of the finished product are uniform) Can be eliminated). Further, when the driven magnet 52 and the impeller 36 are provided with anti-rotation engaging means 54 and 50 so that the driven magnet 52 and the impeller 36 are fixed so as not to be disengaged in the axial direction, they are rotated with each other. Can be prevented.

  In FIG. 2, the number of the snap arms 44 and the inner surface guides 46 is four. Further, the impeller 36 includes a plurality of snap arms 44, but the inner surface guide 46 does not necessarily have to be provided. Further, the driven magnet 52 is formed with a first recess 54 as a detent engagement means, and the impeller 36 is formed with a protrusion 50 as a detent engagement means. However, the impeller 36 is formed with a recess and is driven. A protrusion may be formed on the magnet 52.

  Next, another embodiment of the present invention will be described. FIG. 4 is a cross-sectional view showing the principal part of a second embodiment of the fixing structure of the pump member and magnet in the magnetic drive pump according to the present invention. In FIG. 4, the same reference numerals as those in FIGS. 1 to 3 denote the same members. The impeller 60 as a pump member according to the second embodiment includes an annular step portion 62 outside the base of the snap arm 44 in the impeller base portion 38. The difference between the impeller 60 of the second embodiment and the impeller 36 as the pump member of the first embodiment is that, in the first embodiment, the rotation preventing projections 50 are provided at the roots of the four snap arms 44. In the second embodiment, an annular stepped portion 62 extending 360 degrees is formed around the outside of the roots of the four impellers 36.

  The driven magnet 64 of the second embodiment has a cylindrical shape, and is not provided with the recesses 54 and 56 unlike the driven magnet 52 of the first embodiment. The axial length of the driven magnet 64 is set to be slightly shorter than the distance between the end surface 66 of the stepped portion 62 and the snap hook 48 of the snap arm 44. The inner wall of the driven magnet 64 is integrally formed with a boss 68 as a detent means that protrudes inward from the inner wall. One or more bosses 68 may be used.

  When the impeller 60 and the driven magnet 64 are fixed, the driven magnet 64 is fitted from the outside of the plurality of snap arms 44 and the plurality of inner surface guides 46 of the impeller 60. During the fitting movement of the driven magnet 64, the outer edges of the two snap hooks 48 on the opposite side 180 degrees are in contact with the inner wall of the driven magnet 64, as shown in FIG. The driven magnet 64 can be moved toward the impeller base 38 side of the impeller 60 while maintaining the contact state. The end surface 66 of the stepped portion 62 serves as a stopper, and when the one end surface 70 of the driven magnet 64 comes into contact with the end surface 66 of the stepped portion 62, the movement of the driven magnet 64 stops. When this stop state is reached, the snap hook 48 is separated from the inner wall of the driven magnet 64, and the snap hook 48 is locked to the other end surface 72 of the driven magnet 52. Thereby, the impeller 60 and the driven magnet 64 are fixed.

  Also in the second embodiment, the driven magnet 52 and the impeller 36 can be fixed by the snap hook 48 only by fitting the driven magnet 64 and the impeller 60 together. Therefore, as in Example 1, Example 2 also has the disadvantages of the conventional fixing method by bonding (it takes time to fix and costs equipment costs), and the disadvantage of the insert molding method (the possibility of breaking the magnet) , The dimensions of the finished product are not uniform).

  Next, still another embodiment of the present invention will be described. FIG. 5 is a sectional view showing still another embodiment of the magnetic drive pump according to the present invention. In FIG. 5, the same reference numerals as those in FIGS. 1 to 3 denote the same members. The impeller 74 as the pump member of the third embodiment is formed integrally with the impeller base portion 38 in place of the four snap arms 44 and the four inner surface guides 46 in the impeller 36 as the pump member of the first embodiment. A cylindrical tubular portion 76 is provided. Further, a locking recess 78 as locking means is formed on the inner wall of the cylindrical portion 76. The cylindrical portion 76 is fitted on the outer side thereof with a drive magnet 82 described later. A projecting portion 80 serving as an anti-rotation engaging means is formed at a connecting portion between the cylindrical portion 76 and the impeller base portion 38. The driven magnet 82 has a cylindrical shape. Like the driven magnet 32 of the first embodiment, the driven magnet 82 has a first recess 54 as a detent engagement means that engages with the protrusion 80 of the impeller 74. Is formed.

  In the third embodiment, a synthetic resin connecting member 88 including an annular plate-like base 84 and one or more snap arms 86 in a direction perpendicular to the base 84 is provided. The outer diameter of the annular plate-like base 84 is set to be larger than the inner diameter of the inner wall 53 of the cylindrical driven magnet 82. A snap hook 90 protruding outward from the outer wall is formed at or near the free end of each snap arm 86. The inner and outer walls of each snap arm 86 up to the free end face the space. For this reason, the free end of each snap arm 88 or the vicinity of the free end is set in a state that can be displaced by an external force.

  In the third embodiment, when the impeller 74 and the driven magnet 82 are fixed, first, the cylindrical driven magnet 82 is fitted from the outside of the cylindrical portion 76 of the impeller 74. At that time, the protrusion 80 of the impeller 74 and the first recess 54 of the driven magnet 82 are fitted. Thereby, the rotation of the impeller 74 and the driven magnet 82 is prevented.

  After fitting the cylindrical portion 76 of the impeller 74 and the cylindrical driven magnet 82, the snap arm 86 of the connecting member 88 is fitted and inserted toward the inside of the cylindrical portion 76 of the impeller 74. Then, the locking recess 78 of the cylindrical portion 76 of the impeller 74 and the snap hook 90 of the snap arm 86 of the connecting member 88 are locked. In a state where the locking recess 78 of the cylindrical portion 76 and the snap hook 90 of the snap arm 86 are locked, the impeller 74 and the connecting member 88 are fixed, and the driven magnet is formed by the base 84 and the impeller 74 of the connecting member 88. 82 is sandwiched. Therefore, the driven magnet 82 and the impeller 74 are fixed.

  Also in the third embodiment, after the impeller 74 and the driven magnet 82 are fitted, the driven magnet 82 and the impeller 74 are fixed by the locking by the snap hook 90 only by fitting the impeller 74 and the connecting member 88. Can be made. Therefore, as in Example 1, Example 3 also has the disadvantages of the conventional fixing method by bonding (it takes time to fix and costs equipment costs), and the disadvantage of the insert molding method (the possibility of breaking the magnet) , The dimensions of the finished product are not uniform).

It is sectional drawing which shows Example 1 of the fixing member of the member for pumps and a magnet in the magnetic drive pump which concerns on this invention. It is a principal part perspective view of FIG. It is sectional drawing which shows the fixed state of the drive means and pump member in FIG.1 and FIG.2. It is principal part sectional drawing which shows Example 2 of the fixing member of the member for pumps and a magnet in the magnetic drive pump which concerns on this invention. It is principal part sectional drawing which shows Example 3 of the fixing member of the member for pumps and a magnet in the magnetic drive pump which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Magnetic drive pump 32 Drive magnet 36 Impeller 44 Snap arm 46 Inner surface guide 48 Snap hook 50 Protrusion part 52 Driven magnet 53 Inner wall 54 1st recessed part 56 2nd recessed part 60 Impeller 64 Followed magnet 68 Boss 74 Impeller 76 Cylindrical part 78 Recessed part 82 Follower magnet 86 Snap arm 88 Connecting member 90 Snap hook

Claims (8)

  In the magnetic drive pump having a drive magnet rotated by the drive means, a cylindrical driven magnet rotated in accordance with the rotation of the drive magnet, and a pump member fixed to the driven magnet, the pump member One or more snap arms extending in the axial direction are integrally formed at the same circumferential position around the rotation center axis, and projecting outward from the outer surface of the snap arm at or near the free end of the snap arm And when the free end of the snap arm or the vicinity of the free end is displaceable by an external force and the cylindrical driven magnet is fitted to the outside of one or more snap arms. Which is locked to the driven magnet and fixes the driven magnet to the pump member. Fixing structure of the pump member and the magnet in the moving pump.   2. The pump member in the magnetic drive pump according to claim 1, wherein at least one anti-rotation boss that contacts the adjacent snap arms is provided inward from an inner wall of the cylindrical driven magnet. And magnet fixing structure.   In the pump member, a plurality of the snap arms are provided at the same circumferential position around the rotation center axis, and between the plurality of snap arms and at the circumferential position on the inner wall of the cylindrical driven magnet. 2. A pump in a magnetic drive pump according to claim 1, wherein an inner surface guide that is in contact with the pump member is provided, and the free end of the inner surface guide is not displaced by an external force. Fixing structure for members and magnets.   4. The magnetic drive pump according to claim 3, wherein at least one detent boss that contacts the adjacent snap arm and the inner surface guide is provided inward from an inner wall of the cylindrical driven magnet. 5. Fixing structure of pump member and magnet.   A locking recess for locking by the locking means is provided at a position on one end face side of the inner wall of the driven magnet, and the locking means is driven in a state where the locking means is locked in the locking recess. 2. The structure for fixing a pump member and a magnet in a magnetic drive pump according to claim 1, wherein the structure does not protrude outward from one end face of the magnet.   The pump member is provided with first anti-rotation engaging means, and the driven magnet is provided with second anti-rotation engaging means for engaging with the first anti-rotation engaging means. The structure for fixing a pump member and a magnet in the magnetic drive pump according to claim 1.   In the magnetic drive pump having a drive magnet rotated by the drive means, a cylindrical driven magnet rotated in accordance with the rotation of the drive magnet, and a pump member fixed to the driven magnet, the pump member A cylindrical portion is integrally formed in the axial direction at the same circumferential position around the rotation center axis, a locking recess is formed on the inner wall of the cylindrical portion, and the diameter is larger than the inner diameter of the cylindrical driven magnet. A large annular connecting member is provided, and the connecting member is provided with one or more snap arms extending in the axial direction at a circumferential position around the center position of the annular shape, and snaps at or near the free end of the snap arm. A locking means that protrudes outward from the outer surface of the arm is provided, the free end of the snap arm or the vicinity of the free end can be displaced by an external force, and the cylinder When the driven magnet is fitted to the outside of the cylindrical member, and then the one or more snap arms of the connecting member are fitted to the inner side of the cylindrical portion, the locking means is the locking concave portion of the cylindrical portion. The pump in the magnetic drive pump is fixed so that the coupling member and the pump member are fixed, and the driven magnet is held between the coupling member and the pump member so as not to move. Fixing structure for members and magnets.   A locking recess for locking by the locking means is provided at a position on one end face side of the inner wall of the driven magnet, and the locking means is driven in a state where the locking means is locked in the locking recess. 8. The structure for fixing a pump member and a magnet in a magnetic drive pump according to claim 7, wherein the structure does not protrude outward from one end face of the magnet.

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