JP2017115665A - Pump device and cover member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump device capable of preventing foreign materials from being contacted with a rotating shaft while attaining a light weight and at the same time capable of preventing liquid from dispersing to a surrounding area.SOLUTION: A pump device 10 comprises a pump 20, an electric motor 50, and a cover part 100. The pump 20 comprises an impeller 21, a rotating shaft 23 to which the impeller 21 is fixed and a pump casing 24 for storing the impeller 21 and the rotating shaft 23. The electric motor 50 rotates the rotating shaft 23. The cover part 100 is arranged in at least one of the pump casing 24 and the electric motor 50, a part between the pump casing 24 and the electric motor 50 is stored inside at the rotating shaft 23 and a slit 61 extending from one end side to the other end side along the rotating shaft 23 is formed at its peripheral surface.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pump device that rotates a rotary shaft of a pump by a drive unit, and a cover member.

  There has been proposed a pump device having a drive unit such as an electric motor, a pump driven by the drive unit, and a shaft seal device using a mechanical seal or a gland packing. The pump has an impeller and a casing in which a pump chamber that houses the impeller is formed. The casing has a connecting portion connected to the electric motor.

  The connecting portion protrudes from the casing toward the electric motor. The connecting portion is formed with a hole for lightening in order to reduce the weight of the pump device and reduce the cost. The inside of the connecting portion communicates with the outside through this hole (for example, see Patent Document 1).

JP 09-287593 A

  As described above, the pump device having the connecting portion in which the hole is formed has the following problems. That is, there is a possibility that foreign matter may enter the connecting portion through the hole of the connecting portion and come into contact with the rotating shaft. Further, the liquid leaking from the shaft seal device may be scattered due to the pressure in the pump or the rotation of the rotary shaft.

  An object of this invention is to provide the pump apparatus which can prevent that a foreign material contacts a rotating shaft, reducing the weight, and can prevent the scattering of the liquid to the circumference | surroundings. Moreover, it aims at providing the cover member which can prevent that a foreign material contacts a rotating shaft, reducing a pump apparatus.

  The pump device of the present invention includes a pump, a drive unit, and a cover unit. The pump unit includes an impeller, a rotating shaft fixed to the impeller, and a casing that houses the impeller and the rotating shaft. The drive unit rotates the rotating shaft. The cover portion is provided on at least one of the pump casing and the drive portion, and accommodates a portion between the pump casing and the drive portion on the inner side of the rotary shaft, and has a circumferential surface on the rotary shaft. It is a cylinder shape in which a slit extending from one end side to the other end side is formed.

  The cover member of the present invention is a cylinder that is attached to at least one of a pump and a drive unit that rotates the pump, and that accommodates a portion between the pump casing of the pump and the drive unit inside the rotation shaft of the pump. A slit is formed on the peripheral surface thereof and extends from one end side to the other end side along the rotation axis.

  ADVANTAGE OF THE INVENTION According to this invention, while reducing a weight, while preventing a foreign material from contacting a rotating shaft, the scattering of the liquid to circumference | surroundings can be prevented.

The side view which cuts and shows the pump apparatus which concerns on the 1st Embodiment of this invention partially. Sectional drawing of the same pump apparatus shown along the F1-F1 line cross section shown in FIG. The front view which shows the cover member of the pump apparatus. Sectional drawing of the same cover member shown along the F4-F4 line | wire cross section shown in FIG. Sectional drawing which shows the periphery of the cover member of the pump apparatus which concerns on the 2nd Embodiment of this invention. Sectional drawing which shows the periphery of the cover member of the pump apparatus which concerns on the 3rd Embodiment of this invention. The front view which shows the cover member of the pump apparatus which concerns on the 4th Embodiment of this invention. Sectional drawing which shows the cover member of the pump apparatus which concerns on the 5th Embodiment of this invention. Sectional drawing which shows the periphery of the cover member of the pump apparatus which concerns on the 6th Embodiment of this invention. Sectional drawing which shows the modification of the 3rd Embodiment of this invention.

(First embodiment)
A pump device 10 according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view showing the pump device 10 with a part cut away. As shown in FIG. 1, the pump device 10 is a horizontal pump device that is installed in a posture in which the rotation shaft 23 is parallel to the horizontal direction. The pump device 10 includes a pump 20, an electric motor (drive unit) 50, a cover unit 100, and a drain pan 70.

  The electric motor 50 includes a motor casing 51, a stator accommodated in the motor casing 51, a rotor rotatable with respect to the stator, and a rotating shaft 23 that is fixed to the rotor and rotates integrally with the stator. And a draining collar 55.

  A through hole 53 in which the rotation shaft 23 is disposed is formed at the center of the end wall of the motor casing 51. A second protrusion 52 that protrudes outward along the rotation shaft 23 is formed around the through hole 53 in the end wall of the motor casing 51. The draining collar 55 is provided on the rotating shaft 23. The draining collar 55 is disposed in the through hole 53.

  The pump 20 includes a pump casing 24 in which a pump chamber 26 a, an inflow channel portion 26 b and an outflow channel portion 26 c are formed, an impeller 21, and a rotating shaft that rotates the impeller 21. In the embodiment, the rotating shaft 23 of the electric motor 50 also serves as the rotating shaft of the pump 20. For this reason, the reference numeral 23 is attached to the rotating shaft of the pump 20.

  The pump casing 24 is fitted in a casing body 27 in which a pump chamber 26a, an inflow channel portion 26b and an outflow channel portion 26c are formed, and a through hole 30 formed in a wall portion 27a on the electric motor 50 side of the casing body 27. And a casing cover 28 formed to be able to be combined.

  A through hole 30 is formed in the wall portion 27 a of the casing body 27 facing the electric motor 50. A rotation shaft 23 is disposed in the through hole 30.

  The casing body 27 is partitioned into a pump chamber 26a, an inflow channel portion 26b, and an outflow channel portion 26c by ribs or the like. The pump chamber 26 a is formed so as to be able to accommodate the impeller 21. The pump chamber 26 a is disposed on the through hole 30 side in the casing body 27. The pump chamber 26 a is formed by a rib or the like provided in the casing body 27 and has a cylindrical shape. The pump chamber 26 a communicates with the through hole 30.

  In the pump chamber 26 a, a pump chamber inlet 33 is formed at a portion that intersects with an extension line of the axis of the rotary shaft 23. A pump chamber discharge port 34 is formed in the peripheral wall portion of the pump chamber 26a.

  The inflow channel portion 26b is arranged in the casing body 27 along with the pump chamber 26a in the direction in which the axis of the rotary shaft 23 extends. The inflow channel portion 26 b communicates with the pump chamber inlet 33. The outflow channel portion 26c is disposed on the radially outer side of the pump chamber 26a in the pump chamber 26a. The outflow channel portion 26 c communicates with the pump chamber discharge port 34.

  On the outer peripheral wall of the casing body 27, an inflow port 31 into which a liquid pressure increased by the pump device 10 can flow is formed. The inflow port 31 communicates with the inflow channel portion 26b. A discharge port 32 is formed at the upper end of the casing body 27 so as to discharge the increased fluid. The discharge port 32 communicates with the outflow channel portion 26c.

  The casing cover 28 is formed to be able to fit into the through hole 30. The casing cover 28 includes a first protrusion 38 that is provided at the center of the casing cover 28 and protrudes toward the electric motor 50, and a connecting portion 40 that is connected to the electric motor 50.

  The first protrusion 38 is formed with a through hole 35 in which the rotation shaft 23 can be arranged. The diameter of the through hole 35 is slightly larger than the diameter of the rotating shaft 23.

  An accommodating portion 37b that can accommodate a mechanical seal 37a, which is an example of a seal member, is formed in a portion of the first projecting portion 38 on the casing body 27 side. The accommodating portion 37 b has a conical shape that gradually decreases in diameter toward the electric motor 50. A first fitting portion 39 is formed in a portion of the first protrusion 38 on the electric motor 50 side.

  The shaft seal portion 37 is configured by housing the mechanical seal 37a in the housing portion 37b.

  The first fitting portion 39 has a cylindrical shape that protrudes toward the electric motor 50 with respect to the surface 38a. The outer diameter of the first fitting portion 39 is larger than the outer diameter of the draining collar 55 and the outer diameter of the second protruding portion 52.

  FIG. 2 is a cross-sectional view of the pump device 10 shown along a cross section taken along line F1-F1 shown in FIG. In FIG. 2, the mechanical seal 37a of the pump 20 is omitted.

  As shown in FIGS. 1 and 2, the connecting portion 40 is provided at a plurality of extending portions 41 provided near the periphery of the surface of the casing cover 28 facing the electric motor 50, and at the tip of the extending portion 41. A conical shape having a fixing portion 42 fixed to the electric motor 50.

  The extending portions 41 are arranged apart from each other around the axis. An opening 43 is formed between the extending portions 41 adjacent in the circumferential direction. The inside and the outside of the connecting portion 40 communicate with each other through the opening 43. The extending portion 41 extends to the vicinity of the outer peripheral edge of the end wall 56 in which the through hole 53 of the electric motor 50 is formed.

  The fixing portion 42 is provided at the tip of the extending portion 41 on the electric motor 50 side. The fixing portion 42 is formed in an annular shape and is connected to the tips of all the extending portions 41. The fixing part 42 is fixed by a bolt 57 in the vicinity of the periphery of the end wall 56 of the electric motor 50.

  As shown in FIG. 1, the impeller 21 is disposed in the pump chamber 26a. The impeller 21 includes a cylindrical boss 21a in which the rotation shaft 23 can be disposed, and a blade portion 21b provided on the boss 21a. A keyway is formed on the inner peripheral surface of the boss 21a.

  One end of the rotating shaft 23 is inserted into the boss 21 a of the impeller 21. The rotary shaft 23 is provided with a key formed so as to be able to fit in the key groove of the boss 21 a of the impeller 21. When the key of the rotating shaft 23 is fitted in the key groove of the impeller 21, the rotating shaft 23 is fixed to the impeller 21 so as to be rotatable integrally with each other.

  In this embodiment, the cover part 100 is provided by attaching the cover member 60 to at least one of the pump casing 24 and the electric motor 50. In the present embodiment, the cover member 60 is attached to the casing cover 28 of the pump casing 24.

  Specifically, the cover member 60 is formed so that the first fitting portion 39 of the casing cover 28 can be fitted into one end portion thereof. FIG. 3 is a front view showing the cover member 60. As shown in FIG. 3, the cover member 60 has a cylindrical shape. The inner diameter of the cover member 60 is slightly smaller than the outer diameter of the first fitting portion 39. Since the inner diameter of the cover member 60 is slightly smaller than the outer diameter of the first fitting portion 39, the cover member 60 is tightly fitted to the first fitting portion 39.

  The cover member 60 is fitted to the first fitting portion 39 in such a posture that its axis is parallel to the horizontal direction. Inside the cover member 60, the 2nd protrusion part 52 and the draining collar 55 are arrange | positioned.

  As shown in FIG. 1, in this embodiment, the cover member 60 has a length having a slight gap between the other end and the electric motor 50 in a state where the one end is in contact with the surface 38a. . This gap is a small gap that does not allow human fingers to enter. Alternatively, the cover member 60 may have such a length that one end contacts the surface 38 a and the other end contacts the electric motor 50.

  In the case where there is a gap between the cover member 60 and the electric motor 50, this gap is set to be shorter than the length along the axis of the rotary shaft 23 of the first fitting portion 39.

  FIG. 4 is a cross-sectional view of the cover member 60 shown along the cross section taken along line F4-F4 shown in FIG. As shown in FIG. 4, a slit 61 is formed in the cover member 60. The slit 61 penetrates the cover member 60 in the thickness direction, and extends linearly from one end of the cover member 60 to the other end. As shown in FIG. 1, the cover member 60 is attached to the first fitting portion 39 so that the slit 61 becomes the lower end. That is, the slit 61 is provided at the lower end of the cover unit 100. The slit 61 is not limited to being strictly positioned at the lower end of the cover portion 100. For example, the slit 61 may be disposed at a lower portion of the cover unit 100 instead of the lower end. However, the slit 61 is preferably disposed at the lower end of the cover unit 100 and is positioned at the lower end of the cover unit 100 in the present embodiment.

  The cover member 60 is formed so that the inside can be seen. Specifically, the cover member 60 is formed of a transparent resin material.

  The tray 70 is disposed below the slit 61 of the cover member 60. The tray 70 is formed so as to be able to receive the liquid when the liquid is discharged from the slit 61.

  Next, an example of the attachment work of the cover member 60 will be described. For example, the rotary shaft 23 is inserted into the cover member 60 before the rotary shaft 23 is inserted into the through hole 30 of the casing cover 28.

  Next, the rotating shaft 23 is inserted into the through hole 30 of the casing cover 28. Next, one end portion of the cover member 60 is fitted into the first fitting portion 39. Or you may insert the rotating shaft 23 in the through-hole 30 of the casing cover 28 by which the cover member 60 was fitted beforehand.

  When fitting the cover member 60 to the first fitting portion 39, the cover member 60 is spread by hand so as to widen the inner diameter thereof, so that the first fitting portion 39 is moved into the cover member 60. Can be fitted. Further, since the cover member 60 is expanded from the first fitting portion 39, the frictional force generated between the cover member 60 and the first fitting portion 39 during the attaching operation of the cover member 60 can be reduced. The operation of attaching the member 60 to the first fitting portion 39 can be facilitated. The cover member 60 can be widened by having the slit 61.

  According to the pump device 10 configured as described above, the connecting portion 40 has a shape having the opening 43 between the adjacent extending portions 41, and thus can be reduced in weight. Since the cover portion 100 covers the periphery of the rotating shaft 23, even if foreign matter such as a stone or a string enters through the opening 43 between the extending portions 41, the foreign matter can be prevented from coming into contact with the rotating shaft 23. . For this reason, even if a string enters as a foreign object, for example, it is possible to prevent the string from being wound around the rotary shaft 23. Even if rainwater enters as a foreign object, it can be prevented that the rainwater is scattered around by the rotation of the rotating shaft 23. Further, it is possible to prevent a human finger from coming into contact with a portion of the rotary shaft 23 between the pump casing 24 and the electric motor 50.

  In addition, even if the liquid leaks from the pump chamber 26a through the shaft seal 37 and into the cover 100, the leaked liquid is scattered by the rotation of the rotary shaft 23. It is prevented from being scattered around.

  Thus, according to the present embodiment, it is possible to provide the pump device 10 that can reduce the weight and prevent the foreign matter from coming into contact with the rotating shaft and also prevent the liquid from scattering to the surroundings.

  Moreover, the cover member 60 is attached so that the slit 61 becomes a lower end. For this reason, even if liquid leaks from the mechanical seal 37 a, the leaked liquid is smoothly discharged out of the cover unit 100 through the slit 61.

  Further, the liquid leaking from the mechanical seal 37 a is not accumulated in the cover member 60 by being discharged through the slit 61. For this reason, it is possible to prevent the liquid leaking from the mechanical seal 37 a from being transmitted to the electric motor 50 through the rotating shaft 23.

  Moreover, the inside of the cover part 100 can be confirmed by making the inside of the cover part 100 visible. For this reason, even if liquid leaks from the mechanical seal 37a, this liquid leakage can be confirmed visually. Alternatively, when the draining collar 55 is displaced, the occurrence of the displacement can be confirmed.

  By providing the tray 70 below the slit 61 of the cover unit 100, even if liquid leaks from the mechanical seal 37 a, the leaked liquid accumulates in the tray 70 through the slit 61. For this reason, it can prevent that the ground or floor surface in which the pump apparatus 10 is installed is contaminated with liquid.

  Further, since the cover member 60 has a cylindrical shape having the slit 61, it can be formed, for example, by forming the slit 61 in a commercially available pipe material, or can be easily mass-produced using a mold. For this reason, the cover member 60 can be formed easily and inexpensively.

Further, the length of the cover member 60 is a length having a gap between the other end of the cover member 60 and the electric motor 50 in a state where one end of the cover member 60 is in contact with the surface 38a. In addition, the cover member 60 is formed so that the gap is shorter than the length along the axis of the rotation shaft 23 of the first fitting portion 39. For this reason, even if the cover member 60 moves until it comes into contact with the electric motor 50, the cover member 60 is kept in the state of being fitted to the first fitting portion 39, so that the cover member 60 can be prevented from coming off. .
(Second Embodiment)
Next, a pump device 10 according to a second embodiment of the present invention will be described with reference to FIG. In addition, the same structure as 1st Embodiment attaches | subjects the same code | symbol as 1st Embodiment, and abbreviate | omits description. The pump device 10 of the present embodiment is characterized in that a female screw portion 62 is provided on the inner peripheral wall portion of the cover member 60 and a male screw portion 80 is formed on the outer peripheral wall portion of the first fitting portion 39 of the casing cover 28. It differs from the first embodiment. Other structures are the same as those in the first embodiment. The different points will be described.

  FIG. 5 is a cross-sectional view showing the periphery of the cover member 60 of the pump device 10. In FIG. 5, only the cover member 60, the first fitting portion 39 of the casing cover 28, and the rotating shaft 23 are shown, and the other portions are omitted.

  As shown in FIG. 5, a male screw portion 80 is formed on the outer peripheral wall portion of the first fitting portion 39. The inner peripheral wall portion at the end of the cover member 60 is formed with a female screw portion 62 to which the male screw portion 80 can be screwed. In the present embodiment, the cover member 60 is fixed to the first fitting portion 39 when the female screw portion 62 is screwed into the male screw portion 80 of the first fitting portion 39.

  The cover member 60 is screwed into the male screw portion 80 until one end of the cover member 60 contacts the surface 38a of the casing cover 28. If the slit 61 does not become the lower end when one end of the cover member 60 is in contact with the surface 38a, the cover member 60 is screwed to the position where the slit 61 is the lower end and, for example, the position closest to the surface 38a. Is done.

  In addition, when there is a gap between the cover member 60 and the pump 20, or when there is a gap between the cover member 60 and the electric motor 50, these gaps are gaps that do not allow human fingers to enter. I just need it.

In the present embodiment, the same effect as in the first embodiment can be obtained. Further, the cover member 60 is fixed to the first fitting portion 39 by the female screw portion 62 being screwed into the male screw portion 80 of the first fitting portion 39. For this reason, it is possible to prevent the cover member 60 from moving relative to the first fitting portion 39.
(Third embodiment)
Next, the pump apparatus 10 which concerns on the 3rd Embodiment of this invention is demonstrated using FIG. In addition, the same structure as 1st Embodiment attaches | subjects the same code | symbol as 1st Embodiment, and abbreviate | omits description. In the present embodiment, the first feature is that the engaging protrusion 63 is provided on the inner peripheral wall portion of the cover member 60, and the engaging groove portion 81 is provided on the outer peripheral wall portion of the first fitting portion 39 on the casing cover 28. It differs from the embodiment. Other structures are the same as those in the first embodiment. The different points will be described.

  FIG. 6 is a cross-sectional view showing the periphery of the cover member 60 of the pump device 10. In FIG. 6, only the cover member 60, the first fitting portion 39 of the casing cover 28, and the rotating shaft 23 are shown.

  As shown in FIG. 6, an engagement protrusion 63 is formed at one end of the inner peripheral wall portion of the cover member 60. The engaging protrusion 63 is formed in an annular shape that protrudes inward. In the present embodiment, the engaging protrusion 63 extends from one edge of the slit 61 to the other edge around its axis. The engaging protrusion 63 has a quadrangular cross-sectional shape. The end surface 63 a of the engaging protrusion 63 is flush with the end surface 60 b of the peripheral wall 60 a of the cover member 60.

  On the outer peripheral wall portion of the first fitting portion 39 of the casing cover 28, an engaging groove portion 81 into which the engaging protrusion 63 can be fitted is provided. As an example, the engagement groove 81 is formed at a position where the engagement protrusion 63 is fitted when one end of the cover member 60 comes into contact with the surface 38 a of the casing cover 28 in the first fitting portion 39. Yes. The engaging groove 81 has such a depth that the inner surface of the cover member 60 can come into surface contact with the outer peripheral surface of the first fitting portion 39 when the engaging protrusion 63 is fitted.

In the present embodiment, the same effect as in the first embodiment can be obtained. Further, the cover member 60 is fixed to the first fitting portion 39 by engaging the engaging protrusion 63 in the engaging groove 81 of the first fitting portion 39. For this reason, it can prevent that the cover member 60 moves with respect to the 1st fitting part 39. FIG.
(Fourth embodiment)
Next, the pump apparatus 10 which concerns on the 4th Embodiment of this invention is demonstrated using FIG. In addition, the same structure as 1st Embodiment attaches | subjects the same code | symbol as 1st Embodiment, and abbreviate | omits description. In the present embodiment, the cover member 60 is different from the first embodiment in the cross-sectional shape orthogonal to the axis. Other structures are the same as those in the first embodiment. The different points will be described.

  FIG. 7 is a front view showing the cover member 60 of the present embodiment. As shown in FIG. 7, the cover member 60 has a cylindrical shape in which a cross section perpendicular to the axis thereof is a quadrangle. In FIG. 7, the first fitting portion 39 in a state where the cover member 60 is attached to the first fitting portion 39 is indicated by a two-dot chain line. The cover member 60 is formed so that a cylindrical first fitting portion 39 can be fitted therein.

  Specifically, the cover member 60 is formed so that the outer peripheral surface of the first fitting portion 39 contacts the four inner surfaces.

In the present embodiment, the same effect as in the first embodiment can be obtained. Moreover, in this embodiment, the surface of the wall part which opposes the wall part in which the slit 61 is formed in the cover member 60 becomes an upper surface. Since the slit 61 can be disposed at the lower end by adjusting the posture of the cover member 60 so that the upper surface is horizontal, the slit 61 can be easily disposed at the lower end.
(Fifth embodiment)
Next, the pump apparatus 10 which concerns on the 5th Embodiment of this invention is demonstrated using FIG. In addition, the same structure as 1st Embodiment attaches | subjects the same code | symbol as 1st Embodiment, and abbreviate | omits description. In the pump device 10 of the present embodiment, the length of the slit 61 of the cover member 60 is different from that of the first embodiment. Other structures are the same as those in the first embodiment. The different points will be described.

  FIG. 8 is a cross-sectional view showing the cover member 60 along a cross section passing through the slit 61. As shown in FIG. 8, the slit 61 extends along the axis line from one end of the cover member 60 to a predetermined position on the other end side. In the present embodiment, the slit 61 extends from one end to the intermediate position P.

Next, an example of a method for manufacturing the cover member 60 will be described. First, a cylindrical pipe member is cut to form a member having the same length as the cover member 60 in the axial direction. Next, the range from the intermediate position P to the other end of the member is fixed to a fixture or the like. Next, the slit 61 is formed by cutting in a range where the member is not fixed to the fixture. For this reason, the slit 61 is not formed in the edge part fixed to a fixing tool. In other words, in this embodiment, since the range from the intermediate position P to the other end of the cylindrical pipe member is fixed to the fixture, the slit 61 is not formed in the range from the intermediate position P to the other end. In the present embodiment, the same effect as in the first embodiment can be obtained. In addition, when the slit 61 is formed with respect to the member before the slit 61 is formed, an end portion of the member where the slit 61 is not formed can be fixed to the fixture, so that the member can be easily fixed. . For this reason, the manufacturing efficiency of the cover member 60 can be improved.
(Sixth embodiment)
Next, the pump apparatus 10 which concerns on the 6th Embodiment of this invention is demonstrated using FIG. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  In the present embodiment, the second fitting portion 58 into which the cover member 60 is fitted is provided in the electric motor 50, and the third protrusion 90 is formed on the casing cover 28 instead of the first fitting portion 39. This is different from the first embodiment. Other structures are the same as those in the first embodiment. The different points will be described.

  FIG. 9 is a side view showing the vicinity of the cover member 60 of the pump device 10 of the present embodiment with a part cut away. As shown in FIG. 9, in the motor casing 51 of the electric motor 50, a second fitting portion 58 that can be fitted into the end portion of the cover member 60 is formed around the second protruding portion 52.

  The second fitting portion 58 is formed in a circle centered on the axis of the rotating shaft 23 and protrudes toward the pump 20 side. The cover member 60 is fixed to the electric motor 50 by fitting the second fitting portion 58 into the cover member 60.

  A third projecting portion 90 is formed on the electric motor 50 side of the housing portion 37 b of the first projecting portion 38 of the casing cover 28. The third protrusion 90 is formed in a cylindrical shape having an outer diameter smaller than the inner diameter of the cover member 60. The cover member 60 is attached in such a posture that its end surface is in contact with the electric motor 50.

  When there is a gap between the other end and the pump 20 in a state where one end of the cover member 60 is in contact with the electric motor 50, the third protrusion 90 is longer than this gap along the axis of the rotating shaft 23. It has a length.

  Even when the cover member 60 moves to the pump 20 side and the cover member 60 falls off from the second fitting portion 58, one end of the cover member 60 is supported by the second protrusion 52 and the other end is the third. Since it is supported by the projecting portion 90, it is possible to prevent the cover member 60 that has dropped off from coming into contact with the rotating shaft 23.

  As described above, in the present embodiment, the same effects as those in the first embodiment can be obtained.

  The present invention is not limited to the first, second, third, fourth, fifth and sixth embodiments. In the present embodiment, the rotating shaft 23 of the electric motor 50 is used as the rotating shaft of the pump 20. As another example, the rotary shaft of the pump 20 and the rotary shaft of the electric motor 50 may be different. In this case, the rotation shaft of the pump 20 is fixed to the rotation shaft 23 of the electric motor 50 so as to be able to rotate following the rotation shaft 23 of the electric motor 50.

  Further, the cover member 60 may be formed of a metal material. When the cover member 60 is formed of a metal material, the inside of the cover member 60 can be visually confirmed by forming a plurality of through holes that penetrate the cover member 60 in the thickness direction. The cover member 60 having a plurality of through holes can be formed using, for example, punching metal.

  Moreover, the cover member 60 of 2nd, 3rd, 4th embodiment may be attached to the electric motor 50 like 5th Embodiment. When the cover member 60 of the second embodiment is attached to the electric motor 50, the male screw portion 80 is provided on the outer peripheral wall portion of the second fitting portion 58 of the electric motor 50. When the cover member 60 of the third embodiment is attached to the electric motor 50, the engaging groove portion 81 is provided in the second fitting portion 58.

  Further, the cover member 60 may be provided in both the pump casing 24 and the electric motor 50. In this case, for example, the second fitting portion 58 of the sixth embodiment is formed in the pump device 10 of the first, second, third, fourth, and fifth embodiments, and the cover member 60 is attached to the first fitting. You may fit to the joint part 39 and the 2nd fitting part 58. FIG. In this case, even if the engaging protrusion 63 of the third embodiment is formed at the end of the cover member 60 on the electric motor 50 side, and the engaging groove 81 is formed in the second fitting portion 58. Good.

  Further, as shown in FIG. 10, the engagement protrusion 63 of the third embodiment may have a triangular cross section that passes along the axis of the rotary shaft 23 and is cut along a plane parallel to the axis. . In the third embodiment, the engagement protrusion 63 is formed on the cover member 60, and the engagement groove 81 is formed on the first fitting portion 39. As another example, an engagement groove portion 81 is formed at one end of the inner peripheral wall portion of the cover member 60, and an engagement protrusion 63 that can be engaged with the engagement groove portion 81 is formed in the first fitting portion 39. Also good.

  In the fourth embodiment, the cover member 60 has a cylindrical shape in which a cross section perpendicular to the axis is a quadrangle. As another example, the cover member 60 may have a polygonal cross section perpendicular to its axis. Since the cover member 60 has a polygonal cylindrical shape, the posture of the cover member 60 can be easily adjusted so that the slit 61 is at the lower end.

  In the first, second, third, fourth, and fifth embodiments, the cover portion 100 is formed by attaching the cover member 60 to the pump casing 24. As another example, the cover unit 100 may be formed integrally with the pump casing 24. As an example of being integrally formed, the cover portion 100 may be integrally formed with the pump casing 24. Alternatively, the cover member 60 may be integrally fixed to the pump casing 24 by welding or adhesion. In these cases, the first fitting portion 39 into which the cover member 60 is fitted may not be formed.

  In the sixth embodiment, the cover unit 100 is formed by attaching the cover member 60 to the electric motor 50. As another example, the cover unit 100 may be formed integrally with the electric motor 50. As an example of being integrally formed, the cover portion 100 may be integrally formed with the motor casing 51. Alternatively, the cover member 60 may be integrally fixed to the electric motor 50 (for example, a motor casing) by welding or adhesion. In these cases, the second fitting portion 58 into which the cover member 60 is fitted may not be formed.

  Alternatively, the cover member 60 may be integrally formed on both the pump casing and the drive unit as described above.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, you may delete some components from all the components shown by embodiment mentioned above. Furthermore, you may combine the structure of different embodiment.

  DESCRIPTION OF SYMBOLS 10 ... Pump apparatus, 20 ... Pump, 23 ... Rotating shaft, 50 ... Electric motor (drive part), 60 ... Cover member, 60A ... Cover member, 60B ... Cover member, 61 ... Slit, 62 ... Female thread part, 63 ... Engagement Joint projecting portion, 80 ... male screw portion, 81 ... engaging groove portion, 100 ... cover portion.

Claims (11)

A pump having an impeller, a rotating shaft to which the impeller is fixed, and a pump casing that houses the impeller and the rotating shaft;
A drive unit for rotating the rotating shaft;
Provided on at least one of the pump casing and the drive unit, and accommodates a portion of the rotary shaft between the pump casing and the drive unit on the inner side, and has a circumferential surface from the one end side along the rotary shaft. A cylindrical cover part formed with a slit extending to the other end side;
A pump device comprising: The pump device according to claim 1, wherein the cover part is provided by attaching a cover member to at least one of the pump casing and the drive part. The pump device according to claim 1, wherein the cover part is formed integrally with at least one of the pump casing and the drive part. The pump device according to claim 1, wherein the slit is located at a lower portion of the cover portion. The pump device according to claim 1, wherein the slit extends from one end to the other end of the cover portion. The pump device according to claim 1, wherein the slit extends from one end of the cover portion to a predetermined position on the one end side from the other end.   The fitting part which is provided in at least one of the pump and the drive part, protrudes toward the other, accommodates the rotating shaft inside, and fits in the cover member is provided. 2. The pump device according to 2. Provided on one of the inner peripheral wall portion of the fitting portion and the outer peripheral wall portion of the fitting portion, and toward the other of the inner peripheral wall portion of the fitting portion and the outer peripheral wall portion of the fitting portion. A projecting part for engagement projecting
An engaging groove provided on the other of the inner peripheral wall portion of the fitting portion and the outer peripheral wall portion of the fitting portion, the engaging protrusion engaging with the engaging groove portion;
The pump device according to claim 7, comprising: An internal thread provided on the inner peripheral wall of the cover member;
A male screw portion provided on an outer peripheral wall portion of the fitting portion and screwed into the female screw portion;
The pump device according to claim 7, comprising: The pump device according to claim 1, wherein the cover portion is formed of a material whose inside is visible from the outside.   A cylindrical shape that is attached to at least one of the pump and a drive unit that rotates the pump, and that accommodates a portion between the pump casing and the drive unit of the pump inside the rotation shaft of the pump, and its peripheral surface And a slit extending from one end side to the other end side along the rotation axis.