PUMP AND PUMP ASSEMBLY
1. A pump comprising:
- a housing;
a casing disposed in the housing;
a drive motor disposed in the casing;
a magnet disposed in the first housing and operatively associated with the drive motor to rotate when the drive motor is in operation; and
a fan operably associated with the magnet to rotate with the magnet.
Provided is a fluid pump assembly. The pump has a pair of housings magnetically coupled to each other. The first housing contains a drive motor and a magnetic assembly. The second housing contains a magnetic assembly and a blade for imparting movement to a fluid. As the first magnetic assembly is rotated by the drive motor, the magnetic connection to the assembly in the second housing causes the second magnet to rotate, driving the blade.
- 1. A pump comprising:
a housing; a casing disposed in the housing; a drive motor disposed in the casing; a magnet disposed in the first housing and operatively associated with the drive motor to rotate when the drive motor is in operation; and a fan operably associated with the magnet to rotate with the magnet.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- 9. A pump comprising:
a housing comprising at least one air inlet vent and at least one air outlet vent for facilitating airflow through the housing; a drive motor disposed in the housing; a magnet disposed in the housing and operatively associated with the drive motor; and a fan operably connected with the magnet to rotate therewith and draw air through the housing.
- View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
- 18. A pump assembly comprising:
a first housing comprising a top portion and a bottom cover; a casing disposed in the first housing; a drive motor disposed in the casing; a first magnet disposed in the first housing and operatively associated with the drive motor; a fan connected to the first magnet; and a second housing containing a second magnet and a blade operatively connected to the second magnet for imparting movement to a fluid, wherein the first housing and the second housing are capable of being magnetically coupled to one another thought the first and second magnets.
- View Dependent Claims (19, 20)
This application is a continuation U.S. application Ser. No. 15/359,792, filed Nov. 23, 2016, now U.S. Pat. No. 10,519,956, which is a continuation of U.S. application Ser. No. 13/215,675, filed Aug. 23, 2011, which claims the benefit of priority of U.S. Provisional Application No. 61/375,961, filed Aug. 23, 2010, the disclosures of which are herein incorporated by reference and to which priority is claimed.
The present invention relates to fluid pump assemblies, including magnetically coupled liquid pump assemblies useful with aquariums, terrariums, foot spa basins and the like.
Pumps come in various designs depending on their operating requirements and the environment in which they will be used. One type of pump assembly that has been developed utilizes two separate housings which are operably connected to each other by magnets. One housing contains a drive motor and is designed to be placed outside of a container. A second housing is placed inside of the container and is held in place through a magnetic connection with the first housing. The drive motor rotates a magnet located in the first housing. The magnet of the first housing is magnetically coupled to a magnet in the second housing so that the magnet in the second housing rotates with the magnet in the first housing. The magnet in the second housing is connected to a propeller or an impeller to impart movement to fluid in the container.
Magnetically coupled pumps have mainly been used in aquariums and provide a number of advantages over prior devices. Magnetically coupled pumps may be placed in any location on a container without concern over a mechanical mount. The attraction force of the magnets through the container wall holds the pump in place, eliminating the need to place holes in the container. The elimination of brackets or other mechanical fasteners reduces the amount of used materials and the overall weight of the pump. Mechanical fasteners may fracture or break, resulting in an otherwise operable pump becoming inoperable or less efficient because it cannot be held in a proper position. A magnetically coupled pump also eliminates the need for electrical components to be submerged in water, eliminating the need to seal the motor housing, resulting in a smaller and lighter pump.
In an exemplary embodiment the invention is directed to a pump. The pump includes a housing, a casing disposed in the housing, and a drive motor disposed in the casing. A magnet is operatively associated with the drive motor to rotate when the drive motor is in operation. A fan is operatively associated with the magnet to rotate when the magnet rotates.
In another exemplary embodiment the invention is directed to a pump having a housing, a drive motor, and a magnet. The housing includes at least one air inlet vent and at least one air outlet vent. The drive motor is disposed in the housing and a magnet is operatively associated with the drive motor. A fan is connected to the magnet to draw air through the housing.
In a further exemplary embodiment the invention is directed to a pump assembly having a first housing and a second housing. A casing is disposed in the first housing and a drive motor is disposed in the casing. A first magnet is disposed in the first housing and operatively associated with the drive motor. A fan is connected to the first magnet. The second housing contains a second magnet and a blade is operatively connected to the second magnet for imparting movement to a fluid. The first housing and the second housing are capable of being magnetically coupled to one another through the first and second magnets.
Reference will now be made in detail to exemplary embodiments and methods of the invention as illustrated in the accompanying drawings, in which like reference characters designate like or corresponding parts throughout the drawings. It should be noted, however, that the invention in its broader aspects is not limited to the specific details, representative devices and methods, and illustrative examples shown and described in connection with the exemplary embodiments and methods.
As best shown in
The drive motor 18 may be of any appropriate type, such as electric, hydraulic, pneumatic, etc. In an exemplary embodiment, the drive motor 18 is an electric motor operating on either AC or DC. The motor 18 is connected to a power source (not shown) which may be a battery or outlet power. The drive shaft 24 rotates the dry-side magnet 12 about an axis. Because the movement of the dry-side magnet 12 creates a magnetic field, it may be useful to shield the motor 18 with a cover made out of a material, such as steel, that will prevent the magnetic field generated by the magnet from affecting the motor 18.
The dry-side assembly 10 may be permanently or releasable secured to the wall of a container 26. Alternatively, the dry-side assembly 10 and the wet-side assembly 14 are placed on opposite sides of the container 26 and hold each other in place through the magnetic interaction between the magnets 12, 16. When the pump is activated, the drive motor 18 will rotate the dry-side magnet 12. Rotation of the dry-side magnet 12 causes rotation of the wet-side magnet 16, which causes the blade 20 to rotate and imparts movement to the fluid in the container 26.
The magnetic attraction between the magnets 12, 16 should be sufficiently high so that the wet-side assembly 14 is held in place in the container 26 with enough force to prevent it from being dislodged due to liquid circulation or slight contact. For example, the net magnetic attraction between the dry-side assembly 10 and the wet-side assembly 14 may be at least 1.0 pound, though the net magnetic attraction may be varied depending on the size of the pump and the operating environment. Additionally, a variety of friction elements or cooperating projections and depressions between the assemblies 10, 14 and the container 26 may be included. Though not necessary, additional brackets or other mechanical holding means can be included to attach the assemblies 10, 14 to the container 26.
An exemplary embodiment of the dry-side assembly 10 will now be explained in more detail. As best shown in
In an exemplary embodiment, the bottom cover 34 is releasably secured to the remainder of the housing 30. As best shown in
In an exemplary embodiment, the housing 30 has a slot 40 which can receive a grommet 42. The grommet 42 is made from a flexible material, for example rubber, to provide a flexible connection for a power cable (not shown) that connects to the motor 18 through the housing 30. The grommet 42 prevents the cable from becoming worn due to contact with the housing 30. The grommet 42 may attach to the housing through a mechanical connection, an adhesive connection, or a combination of both. As shown in
The top portion 32 of the housing 30 may have a plurality of holes 48 for receiving screws, bolts, or other mechanical fasteners to connect the housing 30 to the motor 18. Holes 48 may be chamfered to provide countersinking, allowing the mechanical fasteners to be either flush with or below the outer surface of the top portion 32. The top portion 32 may also have a plurality of upper vents 50. The upper vents 50 assist in providing air flow through the housing. For example, the upper vents 50 may act as air inlet vents. The housing 30 may also include a set of lower vents 52 spaced from the upper vents 50. The lower vents 52 may act as air outlet vents in conjunction with air received from the upper vents 50. The number of vents 50, 52, as well as their size and shape, may vary to allow for optimized air flow through the housing 30 and around the motor 18. For example, areas of the housing 30, 32 around the vents 50, 52 may have transition portions, such as the rounded edges shown around the upper vents 50 or the tapered portions shown around the lower vents 52. The transition portions reduce turbulence which can lessen noise and increase heat transfer efficiency.
In an exemplary embodiment, the motor 18 is surrounded by an exterior casing 19. As best shown in
In an exemplary embodiment, the motor casing 19 has at least one fin 58. Preferably, a plurality of fins 58 are arrayed circumferentially around the endcaps 54, 56 as shown in
The fins 58 may be substantially frusto-pyramidal in shape, so that the bottom portion of the fin 58 connected to the casing 19 is longer than the top portion and the sides taper upwards towards each other. As best shown in
In an exemplary embodiment, the casing 19 is attached to the top portion 32 of the housing 30, for example with mechanical fasteners connected through holes 55. The upper vents 50 are sized to create an opening from approximately the outer surface of the casing 19 to approximately just beyond the fins 58 extended from the outer surface of the casing 19. This allows for air to pass along the fins 58 and the outer surface of the casing 19, increasing the amount of heat transfer.
In the exemplary embodiment shown in
The motor casing 19 houses the internal components of the motor 18. In an exemplary embodiment, the motor 18 is a brushless dc motor, though a variety of motors may be used.
As best shown in
As best shown in
In the exemplary embodiment shown in
The fins 58 increase the surface area, and hence the amount of heat transfer between the circulating air and the motor 18, allowing the pump to operate at a higher rate of performance with less of a chance of overheating. Additionally, air cooling the motor 18 can reduce the amount of heat transferred to the container 26. As discussed above, the housing 30 may be made from a material with a low thermal conductivity. Thus, as the air passes through the housing 30, it forms a thermal boundary, minimizing the heat transferred to the housing 30. This may keep the housing 30 cool to the touch, so that it may be safely handled by a user, even after prolonged periods of use.
The foregoing description of the exemplary embodiments of the present invention has been presented for the purpose of illustration. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obvious modifications or variations are possible in light of the above teachings. The embodiments disclosed hereinabove were chosen in order to best illustrate the principles of the present invention and its practical application to thereby enable those of ordinary skill in the art to best utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated, as long as the principles described herein are followed. Thus, changes can be made in the above-described invention without departing from the intent and scope thereof. Moreover, features or components of one embodiment may be provided in another embodiment. Thus, the present invention is intended to cover all such modification and variations.