JP2011174410A - Canned pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit foreign substances contained in liquid from adhering to an outer circumference of a rotor in a rotor chamber. <P>SOLUTION: In a canned pump 1, a pump chamber 21 and the rotor chamber 32 having a rotor 7 provided therein are provided communicating to each other, and a shaft 9 is provided over from the rotor chamber 32 to the pump chamber 21. A shaft hole 95 is formed through the shaft 9, and the rotor 7 is fixed to the shaft 9 which is a rotating shaft of the rotor 7. A rotor hole 74 is formed through the rotor 7. The canned pump 1 includes a circulation channel 15, in which, under the condition that the pump chamber 21 and the rotor chamber 32 are filled with the liquid, the liquid flows from the pump chamber 21 into the rotor chamber 32, and the liquid flowing into the rotor chamber 32 flows into the shaft hole 95 of the shaft 9 through the rotor hole 74 of the rotor 7 to return to the pump 21. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a canned pump.

  As a canned pump, there is a pump provided in communication with a pump chamber provided with an impeller and a rotor chamber provided with a rotor for driving the impeller. The rotor chamber is filled with a liquid (see, for example, Patent Document 1).

  In the canned pump described in Patent Document 1, the rotor is rotationally driven in a state where the pump chamber and the rotor chamber are filled with liquid, and the impeller is rotated through the shaft by this rotational driving. By rotating the impeller, the liquid flows from the pump chamber to the rotor chamber, and the liquid flowing into the rotor chamber flows along the outer periphery of the rotor.

JP 2003-314485 A

  By the way, in such a can pump, the liquid flowing through the can pump contains foreign matters due to various causes. For this reason, the liquid flowing from the pump chamber to the rotor chamber also contains foreign matters, which adhere to the outer periphery of the rotor and hinder the rotation of the rotor.

  Therefore, in order to solve the above-described problems, an object of the present invention is to provide a canned pump that suppresses foreign matters contained in a liquid from adhering to the outer periphery of a rotor in a rotor chamber.

  In order to achieve the above object, the can pump according to the present invention is provided such that a pump chamber and a rotor chamber provided with a rotor are communicated, and a shaft is provided from the rotor chamber to the pump chamber. A shaft hole is formed through the shaft, the rotor is fixed to the shaft with the shaft as a rotation axis, and a rotor hole is formed through the rotor so as to fill the pump chamber and the rotor chamber with liquid. In this state, the liquid flows from the pump chamber to the rotor chamber, and the liquid that has flowed to the rotor chamber flows through the rotor hole of the rotor to the shaft hole of the shaft and returns to the pump chamber. This is the configuration.

  According to the present invention, the pump chamber and the rotor chamber are provided in communication with each other, the shaft is provided from the rotor chamber to the pump chamber, a shaft hole is formed through the shaft, and the rotor is Since the shaft is fixed to the shaft as a rotation axis, a rotor hole is formed through the rotor and the circulation channel is provided, the flow rate of the liquid flowing into the shaft hole of the shaft via the outer periphery of the rotor is suppressed. Is possible. As a result, it is possible to prevent foreign matters contained in the liquid from adhering to the outer periphery of the rotor.

  The said structure WHEREIN: The said shaft hole may be formed along the axial direction of the said shaft.

  In this case, since the shaft hole is formed along the axial direction of the shaft, the liquid flowing into the rotor chamber through the shaft hole can be efficiently returned to the pump chamber.

  The said structure WHEREIN: The said pump chamber is provided with the impeller, the said impeller is fixed to the said shaft or the said rotor by making the said shaft into a rotating shaft, The state which filled the said pump chamber and the said rotor chamber with the liquid When the rotor is driven to rotate and the impeller is rotated by the rotation of the rotor, the liquid flows from the pump chamber to the rotor chamber, and the liquid that flows to the rotor chamber passes through the rotor hole of the rotor. You may have a circulation flow path which flows into the shaft hole of the shaft and returns to the pump chamber.

  In this case, the impeller is provided in the pump chamber, the impeller is fixed to the shaft or the rotor with the shaft as a rotation axis, and the pump chamber and the rotor chamber are liquidated in the circulation channel. When the rotor is rotationally driven in a state where the rotor is filled and the impeller is rotated by the rotation of the rotor, the liquid flows from the pump chamber to the rotor chamber, and the liquid that flows to the rotor chamber Since it flows to the shaft hole of the shaft through the rotor hole and returns to the pump chamber, the rotation of the rotor and the rotation of the impeller can be synchronized to efficiently circulate the liquid in the circulation channel. It becomes.

  In order to achieve the above object, another canned pump according to the present invention includes a pump chamber in which an impeller is provided and a rotor chamber in which a rotor is provided in communication with each other. A shaft is provided over the chamber, and the bearing, the impeller, and the rotor are provided integrally, and the impeller and the rotor rotate through the bearing with the shaft as a rotation axis. In the state where the rotor hole is formed through and the pump chamber and the rotor chamber are filled with the liquid, the liquid flows from the pump chamber to the rotor chamber, and the liquid that flows into the rotor chamber flows into the rotor hole of the rotor. And a circulation channel that flows through the sliding surface between the bearing and the shaft and returns to the pump chamber.

  According to the present invention, the pump chamber and the rotor chamber are provided in communication with each other, the shaft is provided from the rotor chamber to the pump chamber, the impeller is provided in the pump chamber, and the bearing And the impeller and the rotor are integrally provided, the impeller and the rotor rotate integrally with the shaft as a rotation axis through the bearing, and a rotor hole is formed through the rotor. Since the circulation channel is provided, the flow rate of the liquid flowing on the sliding surface between the bearing and the shaft via the outer periphery of the rotor can be suppressed. As a result, it is possible to prevent foreign matters contained in the liquid from adhering to the outer periphery of the rotor.

  The said structure WHEREIN: The said rotor hole may be formed along the rotating shaft direction of the said rotor.

  In this case, since the rotor hole is formed along the rotation axis direction of the rotor, the liquid flowing in the rotor chamber can be efficiently guided to the rotor hole.

  In the above configuration, the rotor hole may be formed in a spiral shape along the rotation direction of the rotor about the rotation axis of the rotor.

  In this case, since the rotor hole is formed in a spiral shape along the rotation direction of the rotor with the rotation axis of the rotor as an axis, the liquid rotates even if the rotational force of the rotor acts on the liquid. It is possible to smoothly pass through the rotor hole without resisting the force.

  The said structure WHEREIN: The opening end of the said rotor hole may be formed circularly.

  In this case, since the opening end of the rotor hole is formed in a circular shape, the liquid flowing in the rotor chamber can be efficiently guided to the shaft hole of the shaft.

  The said structure WHEREIN: The opening end of the said rotor hole may be formed in a fan shape.

  In this case, since the opening end of the rotor hole is formed in a fan shape, the liquid flowing in the rotor chamber can be efficiently guided to the shaft hole of the shaft.

  In the above-mentioned configuration, a bracket that separates the pump chamber and the rotor chamber is provided between the pump chamber and the rotor chamber, and the accumulation inlet of the accumulation unit that separates and accumulates the foreign matters contained in the liquid from the liquid May be formed on the bracket.

  In this case, since the bracket is provided between the pump chamber and the rotor chamber, and the accumulation inlet of the accumulation portion is formed in the bracket, the accumulation inlet of the bracket in the pump chamber contains liquid. It is possible to collect and remove foreign substances. As a result, entry of foreign matter into the rotor chamber can be suppressed.

  Further, since foreign substances contained in the liquid are accumulated from the accumulation inlet to the accumulation portion, it is possible to reduce the foreign substances in the pump chamber, and the foreign matters in the liquid come into contact with the wall surface (inner wall) in the pump chamber. It is possible to suppress damage to the pump chamber due to the above.

  In addition, since the accumulation unit is provided, a filter that removes foreign matters in the liquid becomes unnecessary, so that there is no obstacle to the flow of the liquid, and it is possible to prevent a decrease in pump efficiency due to the filter.

  In the above configuration, a communication hole that communicates the pump chamber and the rotor chamber is formed in the bracket, the shaft is disposed at the center of the bracket, and the accumulation inlet is located at the center of the bracket rather than the communication hole. May be arranged outward.

  In this case, the communication hole is formed in the bracket, the shaft is disposed at the center of the bracket, and the accumulation inlet is disposed outward from the center of the bracket rather than the communication hole. The rotation of the liquid rotates the liquid in the pump chamber, and the centrifugal force generated by the rotation moves the foreign matter contained in the liquid outward with respect to the center of the bracket to accumulate from the accumulation inlet to the accumulation portion, It is possible to suppress the movement of foreign matter into the communication hole. As a result, foreign matter can be prevented from entering the rotor chamber.

  According to the can pump according to the present invention, it is possible to suppress foreign matters contained in the liquid from adhering to the outer periphery of the rotor of the rotor chamber.

It is the schematic side view which opened a part of inside of the can pump concerning this embodiment. It is a schematic sectional drawing of the rotor concerning this embodiment. It is a schematic plan view of the bracket concerning this embodiment. FIG. 4 is a sectional view taken along line AA shown in FIG. 3. FIG. 6 is a schematic side view showing a part of the inside of a can pump according to another embodiment. FIG. 6 is a schematic side view showing a part of the inside of a can pump according to another embodiment. It is a schematic plan view of the rotor concerning other embodiment. It is a schematic perspective view of the rotor concerning other embodiment. It is a schematic side view of the rotor shown in FIG. It is a schematic plan view of the bracket concerning other embodiment. It is the BB sectional view taken on the line shown in FIG. It is a schematic plan view of the bracket concerning other embodiment. It is CC sectional view taken on the line shown in FIG. It is a schematic plan view of the bracket concerning other embodiment. It is the DD sectional view taken on the line shown in FIG. It is a schematic plan view of the bracket concerning other embodiment. It is the EE sectional view taken on the line shown in FIG. It is a schematic plan view of the bracket concerning other embodiment. It is the FF sectional view taken on the line shown in FIG.

  Hereinafter, an embodiment (this embodiment) of the present invention will be described with reference to the drawings. In the embodiment described below, a case where the present invention is applied to a canned pump of a direct drive centrifugal pump as a canned pump is shown.

  As shown in FIG. 1, a can pump 1 according to the present embodiment includes a pump unit 2 provided with an impeller (hereinafter referred to as an impeller 5) that sucks and discharges a liquid, and a motor unit 3 that rotationally drives the impeller 5. It consists of and. In the casing 11 which is the main body casing of the canned pump 1, a bracket 4 which is a partition wall (specifically, a partition wall which separates the pump chamber 21 and the rotor chamber 32 described below) that separates the pump unit 2 and the motor unit 3 is provided. Is provided.

  The pump unit 2 is provided with a pump chamber 21 formed from the casing 11 and the bracket 4, a suction unit 22 that sucks liquid from the outside, and a discharge unit 23 that discharges liquid to the outside.

  An impeller 5 is provided in the pump chamber 21 to send liquid into and out of the pump chamber 21. The impeller 5 is fixed to a pump-side tip 93 of the shaft 9 described below with a screw or the like, and is further engaged with the suction portion 22, so that the impeller 5 rotates counterclockwise (see the rotation direction 51 shown in FIG. 3). The impeller 5 forms a pump chamber flow path 24 for sending the liquid sucked from the suction part 22 to the discharge part 23.

  The motor unit 3 is provided with a motor for driving the impeller 5. This motor includes a stator 6 as a stator and a rotor 7 as a rotor. The stator 6 is disposed in the stator chamber 31, the rotor 7 is disposed in the rotor chamber 32, and the stator chamber 31 is disposed adjacent to the rotor chamber 32.

  As shown in FIG. 1, the stator chamber 31 is formed by a casing 11, left and right stator chamber side portions 12 and 13, and a boundary wall portion 14 that is a boundary wall surface between the rotor chamber 32. Further, a field coil 61 is disposed.

  The rotor chamber 32 is formed from the casing 11, the bracket 4 that is separated from the pump chamber 21, and the boundary wall portion 14 that is a boundary between the stator chamber 31.

  As shown in FIGS. 1 and 2, the rotor 7 disposed in the rotor chamber 32 is a cylindrical body, and a magnet 72 made of a rare earth magnet is provided on the outer periphery 71. Further, a central portion 73 is formed so as to penetrate along the rotational axis direction of the rotor 7, the shaft 9 is inserted into the central portion 73 formed so as to penetrate, and the rotor 7 is fixed to the shaft 9. The rotor 7 rotates the shaft 9. The axis. Further, a rotor hole 74 is formed outside the central portion 73 of the rotor 7 along the rotation axis direction of the rotor 7. The cross-sectional shape of the rotor hole 74 and the open end 75 are circular. As shown in FIG. 1, a gap is formed (occurs) between the outer periphery 71 of the rotor 7 fixed to the shaft 9 and the boundary wall portion 14.

  Between the pump chamber 21 and the rotor chamber 32, a bracket 4 is provided as a partition wall that separates the rotor 7 and the impeller 5, and the pump chamber 21 and the rotor chamber 32 are connected via a communication hole 41 (see below) of the bracket 4. And communicate with each other.

  As shown in FIGS. 1, 3, and 4, in the bracket 4, a communication hole 41 that connects the pump chamber 21 and the rotor chamber 32, and foreign substances in the liquid in the pump chamber 21 are separated from the liquid and accumulated. An accumulation hole 81 (accumulation inlet in the present invention) of the accumulation portion 8 for removing foreign matters from the pump chamber 21 and a flow hole 42 through which liquid flows to the bearing 91 are formed.

  Further, the bracket 4 is formed with one surface of an accumulating portion 8 for accumulating foreign matters, and a stator engaging portion 43 that engages the bracket 4 with the stator chamber side portion 12, and the bracket 4 is engaged with the bearing 91. The bearing engaging portion 44 is formed so as to protrude from the wall portion 45 constituting the partition wall between the pump chamber 21 and the rotor chamber 32. Specifically, in the casing 11 of the can pump 1, the stator engaging portion 43 and the bearing engaging portion 44 protrude from the wall portion 45 toward the motor portion 3 side.

  The accumulation portion 8 is formed from the surface of the bracket 4 on the motor portion 3 side, the casing 11, and the stator chamber side portion 12. An accumulation hole 81 of the accumulation portion 8 is formed in the bracket 4. With respect to the position of the accumulation hole 81 in the bracket 4, the accumulation hole 81 is disposed outward from the communication hole 41 with respect to the center of the bracket 4, and is disposed in the radial direction of the impeller 5. As shown in FIG. 1, the accumulation unit 8 is provided outside the pump chamber 21 of the pump unit 2.

  In the canned pump 1, the shaft 9 is provided from the rotor chamber 32 of the motor unit 3 to the pump chamber 21 of the pump unit 2.

  The rotor 7 provided in the rotor chamber 32 is fixed to the shaft 9, the impeller 5 provided in the pump chamber 21 is fixed by a screw or the like, is pivotally supported on the bracket 4 by a bearing 91, and is supported on the casing 11 by a bearing 92. It is pivotally supported. The shaft 9 (the axis thereof) serves as the rotational axis of the rotor 7 and the impeller 5, and the rotor 7, the impeller 5 and the shaft 9 rotate at the same rotational speed during operation. A shaft hole 95 is formed through the central portion 94 of the shaft 9 along the axial direction thereof. The open end 96 of the shaft hole 95 is circular.

  In the canned pump 1 having the above configuration, the rotor 7 is rotationally driven by the stator 6 in a state where the pump chamber 21 and the rotor 7 chamber are filled with liquid. The shaft 9 is rotated by the rotation of the rotor 7, and the impeller 5 is rotated through the shaft 9. Due to the rotation of the impeller 5, the liquid is sucked from the outside in the pump chamber 21 and discharged from the discharge portion 23 to the outside in the pump chamber 21. Further, by rotating the impeller 5, a part of the liquid flows from the pump chamber 21 to the rotor chamber 32, and the liquid that has flowed into the rotor chamber 32 flows between the rotor hole 74 and the outer periphery 71 of the rotor 7 and the bearings 91 and 92. It passes through the sliding surface (sliding surface) with the shaft 9 and flows into the shaft hole 95 of the shaft 9 and returns to the pump chamber. The flow path of the liquid in the rotor chamber 32 at this time is a rotor chamber flow path 33, and the liquid flows from the pump chamber 21 to the rotor chamber 32 and returns from the rotor chamber 32 to the pump chamber 21 through the circulation flow. It is assumed that the road 15 is used. The rotation direction of the impeller 5 is counterclockwise, similar to the rotation direction of the bracket 4 in FIG. 3, and the liquid flow direction in the pump chamber 21 is the same as the rotation direction of the impeller 5. In the rotor chamber 32, the liquid flows to the side where the pressure is low, so that the liquid flows to the rotor hole 74 of the rotor 7 rather than the outer periphery 71 of the rotor 7.

  Further, the circulation channel 15 will be described in more detail. A part of the liquid discharged (sent) from the impeller 5 is communicated with the communication hole 41 of the bracket 4, the flow hole 42, and the sliding surface between the bearing 91 and the shaft 9. From the pump chamber 21 to the rotor chamber 32, the outer periphery 71 of the rotor 7, the rotor hole 74, and the sliding surface between the bearing 92 and the shaft 9 flow in the rotor chamber 32. Therefore, the wear of the bearings 91 and 92 and the shaft 9 is reduced by the liquid flowing in the rotor chamber 32, and the shaft 9 is rotated smoothly. The liquid that has flowed on the outer periphery 71 of the rotor 7, the rotor hole 74, and the sliding surfaces of the bearings 91 and 92 and the shaft 9 flows into the shaft hole 95 of the shaft 9, passes through the shaft hole, and the low pressure in the pump chamber 21. It returns to the pump chamber 21 from the pump side tip 93 of the shaft 9.

  Further, in the can pump 1, when the liquid containing the foreign matter is supplied, a part of the liquid sent by the impeller 5 in the pump chamber 21 passes through the communication hole 41 and the circulation hole 42 of the bracket 4 and becomes a rotor chamber. Before flowing to 32, the foreign matter contained in the liquid is accumulated in the accumulation portion 8 through the accumulation hole 81. For this reason, foreign substances contained in the liquid flowing in the rotor chamber 32 are reduced. Furthermore, since a liquid flow path to the rotor hole 74 of the rotor 7 is formed in the rotor chamber 32, the amount of liquid flowing to the outer periphery 71 of the rotor 7 can be reduced.

  As described above, in this canned pump 1, the rotor 7 is driven by the stator 6, and the impeller 5 is rotated through the shaft 9, thereby reducing the wear between the bearings 91 and 92 and the shaft 9. Thus, liquid can be supplied in the pump chamber 21.

  According to the canned pump 1 according to the present embodiment, the pump chamber 21 and the rotor chamber 32 are provided in communication with each other, the rotor 7 is fixed, and the shaft 9 configured as the rotating shaft of the rotor 7 is provided from the rotor chamber 32. A shaft hole 95 is formed in the shaft 9 through the pump chamber 21, and a rotor hole 74 is formed in the rotor 7, and the circulation passage 15 is provided. Thus, the flow rate of the liquid flowing in the shaft hole 95 of the shaft 9 can be suppressed. As a result, it is possible to prevent foreign matter from adhering to the outer periphery 71 of the rotor 7 and to prevent damage to the inner wall surface of the rotor chamber 32 constituting the rotor chamber 32 due to the foreign matter. Further, it is possible to prevent damage to the rotor chamber 32 and the members (for example, the bearings 91 and 92, the rotor 7 and the like) in the rotor chamber 32 due to foreign matters contained in the liquid, and high reliability of the can pump 1 is obtained. It is done.

  Further, according to the present embodiment, since the shaft hole 95 is formed along the axial direction of the shaft 9, the liquid flowing in the rotor chamber 32 can be efficiently returned to the pump chamber 21 via the shaft hole 95.

  In addition, according to the present embodiment, the impeller 5 is provided in the pump chamber 21, the impeller 5 is fixed to the shaft 9 with the shaft 9 as the rotation axis, and has the circulation flow path 15, so that the rotation of the rotor 7 and the impeller 5 By synchronizing the rotation, the circulation of the liquid in the circulation channel 15 can be made efficient.

  Further, according to the present embodiment, the rotor hole 74 is formed penetrating along the rotation axis direction of the rotor 7, so that the liquid flowing in the rotor chamber 32 can be efficiently guided to the rotor hole 74.

  Further, according to the present embodiment, since the opening end 75 of the rotor hole 74 is formed in a circular shape, the liquid flowing in the rotor chamber 32 can be efficiently guided to the shaft hole 95 of the shaft 9.

  Further, according to the present embodiment, the bracket 4 is provided between the pump chamber 21 and the rotor chamber 32, and the accumulation holes 81 of the accumulation portion 8 are formed in the bracket 4. Foreign matter contained in the liquid can be accumulated in the accumulation hole 81 and removed. As a result, entry of foreign matter into the rotor chamber 32 can be suppressed. Moreover, it can suppress that the rotor chamber 32, the pump chamber 21, and the members (for example, the bearings 91 and 92, the rotor 7, etc.) in these chambers are damaged by the adhesion of the foreign matter contained in the liquid. High reliability can be obtained.

  Further, according to the present embodiment, the foreign matters contained in the liquid are accumulated from the accumulation hole 81 to the accumulation portion 8, so that the foreign matters in the pump chamber 21 can be reduced and the liquid is applied to the inner wall surface in the pump chamber 21. Damage to the pump chamber 21 due to contact of foreign matter inside can be suppressed.

  In addition, according to the present embodiment, the rotor hole 74 is formed in the rotor 7 and the circulation flow path 15 is provided. Therefore, damage to the rotor 7 and the bearings 91 and 92 due to foreign matter is suppressed, and reliability with respect to the life of the can pump 1 is ensured. Can be improved.

  Further, according to the present embodiment, since the accumulation portion 8 is provided, it is possible to suppress entry of foreign matter into the rotor chamber 32 and the bearings 91 and 92, and the rotor chamber 32 and bearings 91 and 92 due to foreign matter are suppressed. It is possible to improve the reliability of the can pump 1 with respect to the lifetime.

  Further, when the liquid foreign substance is a magnetic substance, the foreign substance can be prevented from adhering to the magnet 72 of the rotor 7. As a result, it is possible to suppress a reduction in motor efficiency and overall pump efficiency due to the accumulation of these foreign substances. On the other hand, in the conventional can pump, the foreign substance of the magnetic material is attached to the rotor by the attractive force of the magnet of the rotor. Thus, if a magnetic body adheres to the outer periphery of a rotor, magnetic force will fall and motor efficiency will fall. In addition, when the amount of foreign matter attached increases, the foreign matter may come into contact with the inner wall of the pump and cause liquid leakage.

  Further, according to the present embodiment, the accumulation hole 81 for accumulating foreign matters in the liquid is formed on the side of the bracket 4 facing the pump chamber 21, and the accumulation portion 8 is formed on the side of the bracket 4 facing the rotor chamber 32. Therefore, the foreign matter is removed from the liquid and accumulated in the collecting portion 8 outside the pump chamber 21, and the foreign matter contained in the liquid flowing through the circulation channel 15 can be reduced.

  Further, according to the present embodiment, since the amount of magnetic foreign matter attached to the magnet 72 is reduced, the foreign matter comes into contact with the inner wall surface (pump inner wall) of the pump chamber, and liquid leakage due to breakage of the pump chamber can be suppressed. Therefore, there are excellent effects that the conventional can pump does not have, such as high reliability.

  In a conventional can pump, when a liquid mixed with foreign matter is circulated, liquid flows into the bearing portion of the shaft, which is the rotating shaft of the rotor or impeller, due to the structure of the can pump. The life of the bearing and bearing is significantly reduced. In order to prevent damage due to the foreign matter, a filter is attached to the portion of the inlet of the circulating liquid. However, since the liquid flow is hindered by attaching the filter, the pump efficiency is lowered. On the other hand, according to the canned pump 1 according to the present embodiment, since the filter for removing the foreign matter in the liquid is not required by providing the accumulating portion 8, there is no obstacle to the flow of the liquid. A decrease in pump efficiency can be eliminated.

  Further, according to the present embodiment, the communication hole 41 is formed in the bracket 4, the shaft 9 is arranged at the center of the bracket 4, and the accumulation hole 81 is arranged outward from the center of the bracket 4 rather than the communication hole 41. Therefore, the liquid in the pump chamber 21 is rotated by the rotation of the impeller 5. Foreign matters contained in the liquid can be moved outward with respect to the center of the bracket 4 by the centrifugal force generated by the rotation of the liquid and can be accumulated in the accumulation portion 8 from the accumulation hole 81. As a result, it is possible to suppress foreign matters from moving into the communication hole 41 and prevent foreign matters from entering the rotor chamber 32.

  In addition, according to the present embodiment, the accumulation holes 81 are arranged in the radial direction of the impeller 5 and outside thereof, so that foreign matter larger than the specific gravity of the liquid is the diameter of the impeller 5 when the impeller 5 is rotated. It moves in the direction and outward, and is accumulated in the accumulation portion 8 from the accumulation hole 81. As a result, the integration efficiency can be improved.

  In this embodiment, the canned pump 1 uses a canned pump of a direct drive type centrifugal pump. However, the present invention is not limited to this, and the can pump of a magnet driven type centrifugal pump can be used. Other types of canned pumps, such as a pump, may be used.

  Further, in the present embodiment, the impeller 5 and the rotor 7 are fixed to the shaft 9, but the present invention is not limited to this. For example, as shown in FIG. 5, the impeller 5 is fixed to the rotor 7, The rotor 7 to which the impeller 5 is fixed may be fixed to the shaft 9.

  Further, in the present embodiment, the impeller 5 and the rotor 7 are fixed to the shaft 9, but the present invention is not limited to this, and as shown in FIG. 6, the bearings 91 and 92, the impeller 5, the rotor 7, May be provided integrally, and the impeller 5 and the rotor 7 may rotate via the bearings 91 and 92 with the shaft 9 as a rotation axis.

  In the circulation flow path 15 according to the present embodiment, the liquid flowing from the pump chamber 21 to the rotor chamber 32 slides between the outer periphery 71 of the rotor 7, the rotor hole 74, the bearing 92 and the shaft 9 in the rotor chamber 32. Flow to the shaft hole 95 of the shaft 9, pass through the shaft hole 95, and return to the pump chamber 21 from the pump side tip 93 of the shaft 9, which is a low pressure of the pump chamber 21, but is not limited to this, The liquid flowing from the pump chamber 21 to the rotor chamber 32 flows in the rotor chamber 32 through the outer periphery 71 of the rotor 7 and the rotor hole 74, and slides between the bearing 92 and the shaft 9 and between the bearing 91 and the shaft 9. It may flow to the moving surface and return to the pump chamber 21. The circulation channel 15 is provided with the bearings 91 and 92, the impeller 5 and the rotor 7 integrally, and the impeller 5 and the rotor 7 rotate through the bearings 91 and 92 in other embodiments (for example, The embodiment shown in FIG. 6 is preferable. According to this other embodiment, the pump chamber 21 and the rotor chamber 32 are provided in communication with each other, the shaft 9 is provided from the rotor chamber 32 to the pump chamber 21, and the impeller 5 is provided in the pump chamber 21. The bearings 91 and 92, the impeller 5 and the rotor 7 are integrally provided, and the impeller 5 and the rotor 7 are rotated through the bearings 91 and 92 with the shaft 9 as a rotation shaft. Is formed through. According to this other embodiment, in the state where the pump chamber 21 and the rotor chamber 32 are filled with the liquid, the liquid flows from the pump chamber 21 to the rotor chamber 32, and the liquid that has flowed into the rotor chamber 32 flows into the rotor chamber. In FIG. 32, the circulation flow path 15 flows through the outer periphery 71 of the rotor 7 and the rotor hole 74, flows into the sliding surface between the bearing 92 and the shaft 9, and the sliding surface between the bearing 91 and the shaft 9 and returns to the pump chamber 21. Therefore, the flow rate of the liquid flowing on the sliding surface between the bearings 91 and 92 and the shaft 9 via the outer periphery of the rotor 7 can be suppressed. As a result, the foreign matter contained in the liquid can be prevented from adhering to the outer periphery of the rotor 7, and it is possible to prevent the foreign matter from damaging the inner wall surface of the rotor chamber 32 constituting the rotor chamber 32. it can. Further, it is possible to prevent damage to the rotor chamber 32 and the members (for example, the bearings 91 and 92, the rotor 7 and the like) in the rotor chamber 32 due to foreign matters contained in the liquid, and high reliability of the can pump 1 is obtained. It is done.

  Further, in this embodiment, the opening end 75 of the rotor hole 74 is formed in a circular shape. However, the present invention is not limited to this, and it has a shape that allows a liquid to flow and has a desired strength of the rotor 7. If so, the rotor hole 74 having an arbitrary shape may be formed so as to penetrate therethrough. For example, as shown in FIG. 7, the cross-sectional shape of the rotor hole 74 and the open end 75 may be formed in a sector shape. In this case, since the cross-sectional shape of the rotor hole 74 and the open end 75 are formed in a fan shape, the liquid flowing in the rotor chamber 32 can be efficiently guided to the shaft hole 95 of the shaft 9.

  In this embodiment, the rotor hole 74 is formed so as to penetrate along the rotation axis direction of the rotor 7 as shown in FIGS. 1 and 2, but the present invention is not limited to this, and FIGS. As shown, the rotor hole 74 may be formed in a spiral shape in the rotation direction of the rotor 7 along the rotation axis of the rotor 7 and with the rotation axis of the rotor 7 as an axis. In this case, even if the rotational force of the rotor 7 acts on the liquid in the rotor hole 74, the liquid can smoothly pass through the rotor hole 74 without resisting the rotational force.

  Further, in the present embodiment, the accumulation hole 81 is formed at the outer peripheral end 46 of the bracket 4, but the present invention is not limited to this and may be at another position. Specifically, the bracket 4 shown in FIGS. In the bracket 4 shown in FIGS. 10 and 11, the accumulation hole 81 is arranged inward of the outer peripheral end 46 and outward of the communication hole 41 with respect to the center.

  Moreover, in this embodiment, although the one accumulation hole 81 is formed in the bracket 4, it is not limited to this, A plurality may be provided. Specifically, the bracket 4 shown in FIGS. In the bracket shown in FIGS. 12 and 13, two accumulation holes 81 are formed and formed at the outer peripheral end 46 of the bracket 4 with an angle of 90 degrees with the center of the bracket 4 as the center point. In this case, since the plurality of collecting holes 81 are formed in the bracket 4, the liquid sent to the pump chamber 21 is sent not from one place of the outer diameter of the impeller 5 but from the entire circumference of the outer diameter of the impeller 5, As a result, the integration efficiency can be improved.

  In the form shown in FIGS. 12 and 13, the two collecting holes 81 are formed at the outer peripheral end 46 of the bracket 4 at an angle of 90 degrees with the center of the bracket 4 as the center point. However, the present invention is not limited to this. Instead, as shown in FIGS. 14 and 15, the two collecting holes 81 may be arranged at the outer peripheral end 46 of the bracket 4, which is the symmetrical position of the center of the bracket 4. In this case, since the accumulation holes 81 are symmetrically arranged with respect to the center of the bracket 4, the liquid in the pump chamber 21 is rotated by the rotation of the impeller 5 so that foreign substances can be evenly accumulated in each accumulation portion 8. Thus, it is possible to equalize the accumulation capability in each accumulation unit 8. As a result, the integration efficiency can be improved. Further, since the accumulation holes 81 of the accumulation unit 8 are provided symmetrically, it is possible to suppress the influence of the installation direction, such as a deviation in the installation position of the accumulation unit 8.

  12 to 15 show a form in which the two accumulation holes 81 are formed in the bracket 4, but the four accumulation holes 81 may be formed in the bracket 4 as shown in FIGS. . In this case, since the accumulation holes 81 are arranged at four points on the outer periphery of the bracket 4 with respect to the center of the bracket 4, the liquid in the pump chamber 21 is rotated by the rotation of the impeller 5, thereby causing each accumulation portion 8 to be rotated. It is suitable for collecting foreign matter evenly. Also, in the bracket 4 shown in FIGS. 16 and 17, the accumulation hole 81 is formed in the central portion 83 of the outer periphery 82 (specifically, the upper side shown in FIG. 16) constituting the accumulation portion 8. In this case, since the same accumulation effect is obtained regardless of whether the impeller 5 rotates clockwise or counterclockwise, the parts of the can pump 1 can be shared regardless of the impeller 5 rotating direction. As a result, the cost can be reduced.

  Moreover, in the form shown in FIGS. 3, 4, and 12 to 17 described above, the opening end 84 of the accumulation hole 81 is symmetric in plan view of the bracket 4, but is not limited to this. As shown in FIGS. 18 and 19, the open end 84 of the accumulation hole 81 may be asymmetrical in a plan view of the bracket 4. Note that the opening end 84 of the accumulation hole 81 may be employed in the above-described embodiment and other embodiments.

  The open end 84 of the accumulation hole 81 in a plan view of the bracket 4 shown in FIGS. 18 and 19 has a shape that gradually expands along the rotation direction 51 of the impeller 5. In this case, the collection efficiency of the liquid in the pump chamber 21 flowing in the rotation direction of the impeller 5 can be improved.

  It should be noted that the present invention can be implemented in various other forms without departing from the spirit, gist, or main features. For this reason, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is indicated by the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  The present invention can be applied to a canned pump.

DESCRIPTION OF SYMBOLS 1 Canned pump 11 Casing 12, 13 Stator chamber side part 14 Boundary wall part 15 Circulation flow path 2 Pump part 21 Pump chamber 22 Suction part 23 Discharge part 24 Pump internal flow path 3 Motor part 31 Stator room 32 Rotor room 33 Rotor room flow Road 4 Bracket 41 Communication hole 42 Flow hole 43 Stator engaging portion 44 Bearing engaging portion 45 Wall portion 46 Outer peripheral end 5 Impeller 51 Rotating direction 6 Stator 61 Field coil 7 Rotor 71 Outer periphery 72 Magnet 73 Central portion 74 Rotor hole 75 Rotor Open end 8 of hole 8 Accumulation part 81 Outer periphery 83 Outer periphery 83 Center part of outer periphery 84 Open end 9 of accumulation hole 9 Shaft 91, 92 Bearing 93 Pump side front end 94 Central part 95 Shaft hole 96 Open end of shaft hole

Claims (10)

In the canned pump,
A pump chamber and a rotor chamber provided with a rotor are provided in communication, and a shaft is provided from the rotor chamber to the pump chamber,
A shaft hole is formed through the shaft,
The rotor is fixed to the shaft with the shaft as a rotation axis, and a rotor hole is formed through the rotor.
With the pump chamber and the rotor chamber filled with liquid, the liquid flows from the pump chamber to the rotor chamber, and the liquid flowing into the rotor chamber passes through the rotor hole of the rotor and enters the shaft hole of the shaft. A canned pump having a circulation channel that flows back to the pump chamber. The canned pump according to claim 1,
The shaft hole is a canned pump formed along the axial direction of the shaft. The canned pump according to claim 1 or 2,
An impeller is provided in the pump chamber,
The impeller is fixed to the shaft or the rotor with the shaft as a rotation axis;
In the circulation flow path, when the rotor is rotationally driven in a state where the pump chamber and the rotor chamber are filled with the liquid, and the impeller is rotated by the rotation of the rotor, the liquid is supplied from the pump chamber. A canned pump that flows into the rotor chamber, the liquid flowing into the rotor chamber flows through the rotor hole of the rotor, flows into the shaft hole of the shaft, and returns to the pump chamber. In the canned pump,
A pump chamber provided with an impeller and a rotor chamber provided with a rotor are provided in communication, and a shaft is provided from the rotor chamber to the pump chamber,
The bearing, the impeller, and the rotor are provided integrally, and the impeller and the rotor rotate through the bearing with the shaft as a rotation axis,
A rotor hole is formed through the rotor,
In a state where the pump chamber and the rotor chamber are filled with liquid, the liquid flows from the pump chamber to the rotor chamber, and the liquid flowing into the rotor chamber passes through the rotor hole of the rotor, and the bearing and the shaft. A canned pump having a circulation channel that flows to the sliding surface and returns to the pump chamber. In the canned pump according to any one of claims 1 to 4,
The rotor hole is a canned pump formed along a rotation axis direction of the rotor. The canned pump according to claim 5,
The rotor hole is a canned pump formed in a spiral shape in the rotation direction of the rotor about the rotation axis of the rotor. The cand pump according to any one of claims 1 to 6,
The opening end of the rotor hole is a canned pump formed in a circular shape. The cand pump according to any one of claims 1 to 6,
The opening end of the rotor hole is a canned pump formed in a fan shape. The cand pump according to any one of claims 1 to 8,
A bracket for separating the pump chamber and the rotor chamber is provided between the pump chamber and the rotor chamber,
A can pump having an accumulation inlet of an accumulation portion for separating and accumulating foreign substances contained in the liquid from the liquid, and formed in the bracket. The canned pump according to claim 9,
A communication hole that connects the pump chamber and the rotor chamber is formed in the bracket,
The shaft is arranged at the center of the bracket,
The accumulation inlet is a canned pump disposed outward from the center of the bracket with respect to the communication hole.

Images