JP2008057513A - Canned pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump capable of discharging a fluid in a gas-liquid mixture phase state at relatively high pressure, and excelling in safety. <P>SOLUTION: This pump X is composed by integrating a pump part 2 with a motor part 1. The motor part 1 is formed into a canned type provided with: a motor case 11; a stator 12 arranged inside the motor case 11; a cylindrical can 13 arranged inside the stator 12; and a rotor 14 rotatably supported inside the can 13, and having a shaft 141. The pump part 2 is composed by comprising a pump chamber 21 formed adjacently to a bulkhead 22 arranged on one end side of the can 13, and a cascade impeller 24 supported to one end of the shaft 141 in the pump chamber 21. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a can pump, and more particularly to a can pump that is configured to discharge liquid at a relatively high pressure.

  It is known that when a large amount of fine bubbles are generated in water, the bubbles slowly float while adsorbing surroundings such as dirt. It is also known that when such fine bubbles are generated in hot water, a hot bath action is exhibited. In order to exhibit such an action effectively, it is necessary to make the size of bubbles to be generated as fine as 10 to 50 μm in diameter or less. Such fine bubbles are sometimes called microbubbles.

  For example, it is known that when a pet such as a dog is immersed in water in which microbubbles are generated, it has an effect on healing of atopic dermatitis in addition to cleaning of hair and skin. In this case, the microbubbles are effective because there are fine bubbles of 10 to 50 μm because these bubbles can be mixed with water and reach the skin.

  The device itself that generates microbubbles as described above is disclosed in, for example, Patent Document 1, but in the future, such microbubble generators are expected to be used for home use. That is, it is expected to be used for effective warm bathing, beauty, health promotion, or cleaning of pets at home.

JP 2004-261314 A

By the way, in order to configure a microbubble generator, a pump capable of discharging a liquid at a relatively high pressure of, for example, 4 kg / cm ² or more is required.

  Moreover, a relatively high pressure pump is required for a water purifier using a reverse osmosis membrane or a filter.

  Furthermore, in order to configure the above devices and equipment for home use, safety against water wetting and the like is required. However, there has been no suitable pump that can satisfy such requirements.

  The present invention has been conceived under the circumstances described above, and an object of the present invention is to provide a pump that can discharge a liquid at a relatively high pressure and is excellent in safety.

  In order to solve the above problems, the present invention employs the following technical means.

  According to the present invention, a can pump is provided, and the can pump is a pump in which a pump portion is integrated with a motor portion, and the motor portion is disposed inside a motor case and the motor case. The pump unit includes a stator, a cylindrical can disposed inside the stator, and a rotor that is rotatably supported inside the can and includes a shaft. Is characterized by comprising a pump chamber formed adjacent to a partition wall arranged on one end side of the can, and a cascade impeller supported on one end of the shaft in the pump chamber. Yes. Preferably, a brushless DC motor can be configured by supporting the magnet on the rotor so that the rotor and the stator cooperate with each other.

  Since this can pump has a can type motor, there is no need to supply electric current to the rotor that rotates while being immersed in water inside the can, and it is highly safe against water wetting. In addition, since the pump unit obtains the discharge pressure by rotating the cascade impeller, the liquid can be discharged at a relatively high pressure.

  In a preferred embodiment, the cascade impeller is restricted in movement in the axial direction by the inner wall of the pump chamber sandwiching the cascade impeller in the thickness direction, and is relatively movable in the axial direction with respect to the shaft and is not relatively rotatable. It is supported by.

  According to such a configuration, the inner wall of the pump chamber restricts only the rotating cascade impeller in the axial direction and is not affected by the axial vibration caused by the rotation of the shaft or the magnet supported by the shaft. High speed rotation of the cascade impeller can be achieved. As a result, the pump unit can discharge a relatively high-pressure gas-liquid mixed phase fluid, and noise and noise are reduced.

  In a preferred embodiment, the shaft is also rotatably supported by a first bearing and a second bearing that are arranged in the axial direction.

  With such a configuration, the rotor can be stably supported.

  In a preferred embodiment, the shaft is supported so as to be axially movable relative to the first bearing and the second bearing.

  According to such a configuration, since the axial vibration caused by the rotation of the shaft or the magnet supported by the shaft is not transmitted to the pump case or the can, the rotor can be rotated at a higher speed. As described above, coupled with the fact that the shaft can move relative to the cascade impeller in the axial direction, high-speed rotation of the cascade impeller can be achieved.

  In a preferred embodiment, the can has a bottom at the other end, and the first bearing is supported via a support member fixed to the bottom of the can. The second bearing is provided on the partition wall.

  According to such a configuration, the rotor can be appropriately rotated and supported.

  In a preferred embodiment, the support member is attached so as to penetrate the bottom of the can, and has a through hole that penetrates the inside and outside of the can. The through hole is detachable. On the other hand, a tool engaging means is formed on the end surface of the shaft while being sealed by the plug.

  According to such a configuration, even if the cascade impeller in the pump chamber falls into a locked state due to, for example, long-term operation stop, the plug is removed, and a tool such as a driver inserted into the can through the through hole of the support member By engaging the shaft with the tool engaging means of the shaft and forcibly rotating the shaft, the locked state of the cascade impeller can be easily released without having to disassemble the motor unit or the pump unit. it can.

  In a preferred embodiment, the magnet is arranged in an annular shape surrounding the shaft, and the first bearing is arranged in a space between the magnet and the shaft.

  According to such a configuration, the first bearing can be arranged by effectively using the internal space of the can, so that the axial length of the motor unit can be made compact, and the pump can be further downsized.

  In a preferred embodiment, the partition wall is formed with a through hole that allows the internal space of the can to communicate with the pump chamber.

  In a preferred embodiment, the cascade impeller further includes a circulation hole penetrating in the thickness direction.

  According to such a configuration, the fluid in the pump chamber can be circulated inside the can, and the motor unit can be appropriately cooled. As a result, stable long-time operation is possible.

  In a preferred embodiment, the partition wall is formed by a partition member that is aligned and fitted to one end of the can, and the pump chamber is aligned with the partition member and the partition member. The can, the partition member, and the pump chamber cover are fixed to each other by the fitting of the pump chamber cover. The motor case supports the can or an appropriate portion of the resin connecting member. And the other appropriate portion of the resin connecting member is connected to the pump chamber cover.

  According to such a configuration, the can connecting member, the partition wall member, and the pump chamber cover can be assembled in a properly aligned state with the resin coupling member as an intermediary, and the overall weight reduction can be achieved. Can do.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the drawings.

  Hereinafter, a preferred embodiment of the present invention will be specifically described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a can pump X according to an embodiment of the present invention.

  The canned pump X includes a motor unit 1 and a pump unit 2 integrally. The motor unit 1 is formed in a can type, and includes a motor case 11, a stator 12 arranged inside the motor case 11, a can 13 arranged inside the stator 12, and an inside of the can 13. And a rotor 14 rotatably supported.

  The motor case 11 is formed in a bottomed cylindrical shape, and is made of a metal such as aluminum, for example. The can 13 is generally configured to include a cylindrical portion 131, a bottom portion 132 formed so as to close one end of the cylindrical portion 131, and an outward flange portion 133 formed at the other end of the cylindrical portion 131. The outer peripheral portion of the outward flange portion 133 is fitted and fitted to the opening of the motor case 11 and assembled to the motor case 11. The stator 12 includes an electromagnetic coil disposed in a space between the inner wall of the motor case 11 and the cylindrical portion 131 of the can 13. The rotor 14 includes a shaft 141 and a magnet 143 supported on the shaft 141 via a bracket 142. Thereby, a brushless DC motor is formed in the motor unit 1. For the magnet 143, it is preferable to use a plastic magnet in order to contribute to the weight reduction of the motor unit. In the embodiment shown in the figure, the magnet 143 is arranged in an annular shape surrounding the shaft 141.

  A partition wall member 22 is fitted into the other end of the cylindrical portion 131 of the can 13 in a centering manner. One end of the shaft 141 is rotatably supported by a first bearing 31 supported on the bottom portion 132 of the can 13 and the other end is supported by a second bearing 32 provided on the partition wall member 22. A tool engaging means 141c that engages with a tool such as a flat-blade screwdriver is formed on the end surface of one end of the shaft 141.

  The first bearing 31 is constituted by a sliding bearing that allows relative movement of the shaft in the axial direction, and is fitted and held on the inner surface of the cylindrical support member 15 attached to the bottom 132 of the can 13 by screw means. Yes. Further, the cylindrical support member 15 to the first bearing 31 are disposed in a space between the shaft 141 and the annularly disposed magnet 143. Thereby, the motor unit 1 can be made compact in the axial direction. Similarly to the first bearing 31, the second bearing 32 is configured by a slide bearing that allows relative movement in the axial direction of the shaft 141, and a cylindrical holder 221 formed in a penetrating manner in the partition wall member 22. Is fitted and held on the inner surface. With this configuration, the rotor 14 is supported by the first and second bearings 31 and 32 so that the shaft 141 can rotate and move in the axial direction. The cylindrical support member 15 that supports the first bearing 31 is formed with a plurality of flow holes 15 a penetrating in the diametrical direction, and at one end of the magnet 143 in the rotor 14, the stirring blade 144. Is provided. The significance of these flow holes 15a and stirring blades 144 will be described later.

  The cylindrical support member 15 is attached by screw means so as to penetrate the bottom portion 132 of the can 13 and includes an axial through hole 15b. The axial through hole 15b is also sealed by a detachable plug 16. Thereby, for example, even if the cascade impeller 24 is locked in the pump chamber 21, the plug 16 is removed without disassembling the pump part and the motor part, and the cylindrical support member 15 is penetrated in the axial direction. The locked state can be easily released by engaging a tool engaging means 141c formed at one end of the shaft 141 with a tool such as a flat-blade screwdriver inserted through the hole 15b and forcibly rotating the shaft 141. it can.

  The pump chamber 21 is formed by a space surrounded by a partition member 22 and a pump chamber cover 23 that is centered and fitted to the partition member 22. In the pump chamber 21, the other end portion of the shaft 141 of the rotor 14 is extended. The cascade impeller 24 is supported on the extending portion 141a of the shaft 141 so as not to rotate relative to the shaft 141 and to move in the axial direction. That is, the extending portion 141a of the shaft 141 has a constant outer diameter over the tip portion, and the center hole 241a of the central boss portion 241 of the cascade impeller 24 is also made larger than the outer diameter of the extending portion 141a of the shaft 141. And has a constant inner diameter in the axial direction. Thus, a key groove 141b having an axial end wall is formed on the outer periphery of the shaft 141, and the central hole of the boss portion 241 of the cascade impeller 24 opens to the axial end portion. A key groove 241b is formed, and a key 25 that fits into both of these key grooves 141b and 241b is attached. However, the axial length of the key 25 is shorter than the key groove 141b provided in the shaft 141. As a result, the cascade impeller 24 is not rotatable relative to the shaft 141, and is within the range allowed by the difference between the length of the key groove 141b provided in the shaft 141 and the length of the key 25, with respect to the shaft 141. Can be moved relative to each other in the axial direction.

  The cascade impeller 24 includes a central boss portion 241, a disk portion 242 extending radially outward from the central boss portion 241, and an impeller portion 243 formed on the outer periphery of the disk portion 242. On the other hand, the pump chamber 21 includes a central space 21 </ b> A that accommodates the central boss portion 241 in the cascade impeller 24, and a peripheral annular space 21 </ b> B that accommodates the impeller portion 243. The disk portion 242 of the cascade impeller 24 is sandwiched between the regulating walls 22 a and 23 a formed on the partition wall member 22 and the pump chamber cover 23 via a slight gap. As described above, the cascade impeller 24 can move relative to the shaft 141 in the axial direction, but the absolute movement of the shaft 141 in the axial direction is restricted by the restriction walls 22a and 23a. .

  The structure of the pump that incorporates the cascade impeller 24 in the pump chamber 21 is a well-known one. As shown in FIG. 2, the inflow port 26 and the discharge port 27 communicate with the peripheral annular space 21B. It has been made. When this pump is used as a pump for a microbubble generator, a gas-liquid mixed phase fluid in which water and air are mixed at an appropriate ratio flows into an inflow port 26 from an unillustrated gas-liquid mixing device. Be made. The gas-liquid mixed phase fluid introduced into the pump chamber 21 from the inflow port 26 is given pressure while moving in the peripheral annular space 21B as the impeller portion 243 rotates, and from the discharge port 27 at a predetermined pressure. Can be discharged.

  The central space 21A and the peripheral annular space 21B in the pump chamber 21 are communicated with each other through a gap between the disk portion 242 of the cascade impeller 24 and the regulating walls 22a and 23a sandwiching the disk portion 242. In addition, the disk portion 242 of the cascade impeller 24 is formed with a circulation hole 242a that passes through the disk portion 242 in the thickness direction. The partition wall member 22 is formed with a through hole 22 b that allows the internal space of the can 13 to communicate with the pump chamber 21.

  As described above, the can 13 is fitted to the motor case 11 in a centered state, the partition wall member 22 is fitted to the can 13 in a centered state, and the pump chamber cover 23 is fitted to the partition wall. The member 22 is fitted in a centered state. The motor case 11, the can 13, the partition wall member 22, and the pump chamber cover 23 are fixed to each other through a resin connection member 41. That is, as shown in FIG. 1, the connecting member 41 has a generally cylindrical shape, and an appropriate portion thereof is fixed to the end of the motor case 11 by the bolt 51, while the appropriate portion is fixed by the bolt 52. The pump chamber cover 23 is connected. O-rings are interposed between the connecting member 41 and the can 13, between the connecting member 41 and the partition wall member 22, and between the connecting member 41 and the pump chamber cover 23, respectively. A water-tight seal is formed between the inner space of 21 to 13 and the outside. With such a configuration, the partition wall member 22 is fitted so as to overlap the coupling member 41 coupled to the motor case 11, the cascade impeller 24 is attached to the extending portion of the shaft 141, and finally the pump chamber cover 23 is fitted. Thereafter, the pump chamber cover 23 and the connecting member 41 can be connected to each other for easy assembly. Further, since the connecting member 41 is made of resin, it greatly contributes to the weight reduction of the entire can pump X.

  Next, an important operation of the canned pump X having the above configuration will be described.

  When a DC current is passed through the stator 12, the rotor 14 is rotated by the electromagnetic force generated thereby, and the cascade impeller 24 is rotated. As described above, the shaft 141 of the rotor 14 can move relative to the first and second bearings 31 and 32 in the axial direction. However, due to the electromagnetic force acting between the stator 12 and the magnet 143, Always try to take a fixed axial position. In addition, since the shaft 141 can move in the axial direction, even if axial vibration occurs during rotation of the rotor 14 due to mass deviation of the magnet 143 and other members in the rotor 14, this vibration does not occur at all. It does not act on the can 13 or the partition member 22. Therefore, during the operation of the motor unit 1, unnecessary vibration is generated, and resistance that inhibits rotation of the rotor 14 due to this is not generated, and smooth rotation of the rotor 14 is maintained. be able to.

  Further, since the cascade impeller 24 is axially movable with respect to the shaft 141, even if axial vibration occurs in the shaft 141 during rotation, this vibration is transmitted to the cascade impeller 24. Nor. Therefore, due to the axial vibration of the shaft 141, the disc portion 242 of the cascade impeller 24 does not apply a thrust force to the regulating walls 22a and 23a sandwiching the disc portion 242. Therefore, a resistance that inhibits the rotation of the cascade impeller 24 does not occur.

  Therefore, according to the canned pump X having the above-described configuration, the cascade impeller 24 in the pump unit 2 can be rotated at high speed and smoothly, and as a result, the liquid can be discharged from the discharge port 27 at a relatively high pressure. Can do.

  Of course, since the motor unit 1 of the pump X is a can type, it is safe against water wetting.

  In addition, a circulation hole 242a is formed in the disk portion 242 of the cascade impeller 24, and a through hole 22b is formed in the partition wall member 22, so that the internal space of the pump chamber 21 and the can 13 is communicated. The fluid in the pump chamber 21 is circulated inside the can 13. Thereby, during operation, the pump chamber 21 is appropriately cooled, and continuous operation for a long time is possible. Note that, as described above, the cooling action is provided with the stirring blade 144 at the end of the magnet 143 of the rotor 14 and the diameter of the cylindrical bracket 15 for the first bearing 31 is also reduced. Since the flow hole 15a penetrating in the direction is formed, the fluid inside the can 13 is forcibly circulated.

  As described above, according to the present invention, it is possible to discharge a liquid at a relatively high pressure and realize a pump having excellent safety. For example, by using this pump, microbubbles for home use can be generated. It is optimal for configuring a device or a water purifier using a reverse osmosis membrane or a filter.

  Of course, the scope of the present invention is not limited to the above-described embodiments, and all modifications within the scope of the matters described in the claims are all included in the scope of the present invention. Further, the purpose of use of the pump of the present invention is not questioned.

It is a longitudinal section showing an example of a can pump concerning the present invention. It is a right view of the state which removed the pump chamber cover of the can pump shown in FIG.

Explanation of symbols

X canned pump 1 motor part 2 pump part 11 motor case 12 stator 13 can 14 rotor 15 support member 15b axial through hole 16 plug 21 pump chamber 22 partition member (partition wall)
24 Cascade impeller 141 Shaft 141c Tool engaging means 143 Magnet

Claims (11)

A pump in which a pump unit is integrated with a motor unit,
The motor unit includes a motor case, a stator disposed inside the motor case, a cylindrical can disposed inside the stator, and a shaft rotatably supported inside the can. And a canned type with a rotor,
The pump unit includes a pump chamber formed adjacent to a partition wall disposed on one end side of the can, and a cascade impeller supported on one end of the shaft in the pump chamber. A canned pump.   The quad pump according to claim 1, wherein the rotor includes a magnet supported by the shaft, and the rotor and the stator constitute a brushless DC motor.   The cascade impeller is supported by the inner wall of the pump chamber sandwiching the cascade impeller in the thickness direction, and is relatively movable and non-rotatable relative to the shaft in the axial direction. The canned pump according to claim 1 or 2.   4. The can pump according to claim 3, wherein the shaft is rotatably supported by a first bearing and a second bearing that are arranged apart from each other in the axial direction.   The can pump according to claim 4, wherein the shaft is supported so as to be relatively movable in the axial direction with respect to the first bearing and the second bearing.   The can has a bottom at the other end, and the first bearing is supported via a support member fixed to the bottom of the can, while the second bearing is The canned pump according to claim 4 or 5 provided in said partition.   The support member is attached so as to penetrate the bottom of the can and has a through hole that allows the inside and outside of the can to communicate with each other, and the through hole is sealed by a detachable plug. The cand pump according to claim 6, wherein a tool engaging means is formed on an end face of the shaft.   The can pump according to claim 6, wherein the magnet is arranged in an annular shape surrounding the shaft, and the first bearing is arranged in a space between the magnet and the shaft.   The can pump according to any one of claims 1 to 6, wherein the partition wall is formed with a through hole that allows communication between the internal space of the can and the pump chamber.   The canned pump according to claim 9, wherein the cascade impeller has a circulation hole penetrating in a thickness direction.   The partition is formed by a partition member that is fitted and fitted to one end of the can, and the pump chamber includes the partition member and a pump chamber cover that is fitted and fitted to the partition member. On the other hand, the can, the partition member and the pump chamber cover are fixed to each other by connecting an appropriate portion of the resin connecting member to the can or the motor case supporting the can and the resin. The canned pump according to any one of claims 1 to 10, which is performed by connecting another appropriate portion of the made connecting member to the pump chamber cover.

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