Patent Description:
Conventional casing of a pump is formed of a metal. As a result, it is difficult to process the casing and manufacturing cost of the pump is very expensive.

<CIT> discloses a liquid circulation pump using magnetic force, where a magnet holder is integrally molded with a magnet, and a permanent magnet is integrally molded with an impeller.

<CIT> discloses a magnet pump with an improved structure of the drive.

<CIT> discloses an assembly and method for pre-stressing a canister in a magnetic coupling device where the canister is positioned between an inner magnet assembly and an outer magnet assembly to statically seal a fluid chamber.

<CIT> discloses rotary devices having a casing and an inner drive portion of a magnet coupling disposed inside of a rotor assembly.

<CIT> discloses a centrifugal pump having a drive by means of a magnetic coupling. Inner magnets are applied to a metal magnet carrier part which in turn is held by a closure part that is made of plastic.

<CIT> and <CIT> represent some further relevant background art.

The invention is to provide a hybrid pump manufactured simply and a method of manufacturing a magnetic drive in the same.

Additionally, the invention is to provide a magnetic drive including a metal member and a hybrid pump including the same.

Furthermore, the invention is to provide a magnetic drive including a metal member combined with a magnet and a hybrid pump including the same.

The invention is defined by a hybrid pump according to claim <NUM> and a method of manufacturing a magnetic drive of a hybrid pump according to claim <NUM>.

According to the invention, the hybrid pump includes an impeller; a magnetic drive configured to control rotation of the impeller; a drive shaft combined with the magnetic drive; and a motor. Here, the drive shaft rotates in response to rotation of an axis of the motor, the magnetic drive rotates when the drive shaft rotates, the impeller rotates in response to rotation of the magnetic drive, a drive body of the magnetic drive is formed of plastic, and the drive shaft is formed of metal.

According to the invention, the hybrid pump includes an impeller; and a magnetic drive configured to control rotation of the impeller. Here, the magnetic drive has a plastic member and a metal member included in the plastic member.

According to the invention, the method of manufacturing a magnetic drive includes inserting a drive shaft formed of metal and a metal member in a mold; and manufacturing a drive body combined with the drive shaft by injecting melted plastic material corresponding to a plastic member into the mold. Here, the metal member is included in the drive body.

In a hybrid pump of the invention, a drive body of a magnetic drive is formed of plastic and a drive shaft combined with the drive body is formed of metal, and thus the magnetic drive may be simply manufactured and be mass-produced.

In the hybrid pump of the invention, the drive body of the magnetic drive is formed of plastic and a metal member is included in the drive body, and so the drive body may be simply manufactured with adequate strength and cost for manufacturing the drive body may reduce because the drive body can be mass-produced.

According to an embodiment of the invention, a magnet is directly adhered to the metal member, and thus the magnet may be more stably fixed to the drive body.

The present invention will become more apparent by describing in detail example embodiments with reference to the accompanying drawings, in which:.

<FIG> and <FIG> thus relate to a pump of the type as claimed. <FIG> illustrate an aspect which is not part of the claimed invention. <FIG> illustrates a magnetic drive which is not according to the present invention. <FIG> and <FIG> illustrate magnetic drives which are according to the present invention. <FIG>, <FIG> and <FIG> illustrate further details of such magnetic drives.

In the present specification, an expression used in the singular encompasses the expression of the plural, unless it has a clearly different meaning in the context. In the present specification, terms such as "comprising" or "including," etc., should not be interpreted as meaning that all of the elements or operations are necessarily included. That is, some of the elements or operations may not be included, while other additional elements or operations may be further included. Also, terms such as "unit," "module," etc., as used in the present specification may refer to a part for processing at least one function or action and may be implemented as hardware, software, or a combination of hardware and software.

The invention relates to a hybrid pump. In the hybrid pump, a drive body of a magnetic drive is formed of plastic and a shaft of the magnetic drive is formed of metal. As a result, it is easy to manufacture the magnetic drive and the magnetic drive may be mass-produced in less time and cost.

Additionally, the drive body of the magnetic drive in the hybrid pump has a structure that a metal member is included in a plastic member. Accordingly, it is easy to manufacture the magnetic drive with adequate strength.

In one embodiment, a magnet adhered to an internal surface of the drive body may be directly adhered to the metal member.

Hereinafter, various embodiments will be described in detail with reference to accompanying drawings.

<FIG> is a perspective view illustrating a pump type according to the invention. <FIG> is a view illustrating decomposition structure of a casing, <FIG> is a perspective view illustrating a casing, <FIG> is a perspective view illustrating decomposition structure of a liner and a metal member, and <FIG> is a view illustrating decomposition structure of a casing in a pump according to another embodiment, <FIG> is a view illustrating schematically section of a pump according to still another embodiment, <FIG> is a view illustrating detailed decomposition structure of a pump, and <FIG> is a view illustrating section of a magnetic drive according to one embodiment. A left view in <FIG> shows composition structure of a liner and a metal member, and a right view in <FIG> illustrates composition structure of a body, a liner and a metal member. A front view in <FIG> shows decomposition structure of a liner and a metal member, and a back view in <FIG> illustrates composition structure of a body, a liner and a metal member.

In <FIG>, <FIG> and <FIG>, the pump is a hybrid pump, and it may include an impeller <NUM>, a casing <NUM>, a drive member <NUM>, an electrical motor <NUM> and a shaft <NUM>.

The impeller <NUM> may deliver fluid inputted to a first fluid flow space 310a through a piping such as a pipe, etc. to a second fluid flow space 310b. Particularly, the impeller <NUM> may rotate in a specific velocity and deliver the fluid inputted to the first fluid flow space 310a up to a specific height of the second fluid flow space 310b in response to the rotating. Here, the specific height may depend on a rotation velocity of the impeller <NUM>.

The casing <NUM> includes a part of the impeller <NUM> to protect the impeller <NUM> and may include the first fluid flow space 310a to which the fluid is inputted and the second fluid flow space 310b for delivering the fluid transferred through the first fluid flow space 310a to another piping. Here, the first fluid flow space 310a may cross over the second fluid flow space 310b.

In one embodiment, in the casing <NUM>, a metal member may be included in a plastic member. This will be described below.

The drive member <NUM> may prevent the fluid flowing through the first fluid flow space 310a from being leaked and control an operation of the impeller <NUM>, especially rotation operation.

The motor <NUM> controls a power of the pump.

The shaft <NUM> fixes a central part of the impeller <NUM>. As a result, the impeller <NUM> may locate in the casing <NUM> with fixed stably by the shaft <NUM> and transfer fluid delivered from the first fluid flow space 310a to a second fluid flow space 310b. This impeller <NUM> may rotate through magnetic reaction as described below.

Hereinafter, the casing <NUM> and the drive member <NUM> may be described in sequence.

Firstly, the casing <NUM> will be described in detail.

In <FIG>, the casing <NUM> of the pump of the present embodiment may include a body, a liner <NUM>, a metal member having a first sub metal member <NUM> and a second sub metal member <NUM> and a supporting member <NUM>.

The body may include a body member <NUM>, a first body connection member <NUM>, a first body flange member <NUM>, a second body connection member <NUM> and a second body flange member <NUM>, and it may be in a body.

In one embodiment, the body may be formed of a super engineering plastic or an engineering plastic. For example, the body may be made up of a polyphenylene ethers resin composition including a polyphenylene ethers resin and a polystyrene resin. Of course, the body may be formed of a polypropylene, a polyimide, a polysulfone, a poly phenylene sulfide, a polyamide imide, a polyacrylate, a polyether sulfone, a polyether ether ketone, a polyether imide, a liquid crystal polyester, a polyether ketone, etc. and their combination.

The body member <NUM> has for example a circular shape, but shape of the body member <NUM> is not limited as the circular shape.

The first body flange member <NUM> is connected to one end part of the body member <NUM> through the first body connection member <NUM> and may be combined with a flange of a piping.

In one embodiment, at least one hole may be formed on a first body flange member <NUM>, a hole may be formed on the flange of the piping, and the first body flange member <NUM> may be combined with the flange of the piping by passing a fixing member such as a bolt, etc. through the hole of the first body flange member <NUM> and the hole of the flange of the piping. As a result, the pump may be combined with the piping.

On the other hand, the pump may be combined with every device having a flange, and a combination process may be similar to above combination process.

The second body flange member <NUM> may be connected to the other end part of the body member <NUM> through the second body connection member <NUM> and be combined with a piping. The combination process is similar to the combination process of the first body flange member <NUM>.

The liner <NUM> is formed in the body and has the same shape as the body or has a shape similar to the body.

In one embodiment, the liner <NUM> may be formed of a fluorine resin. The fluorine resin means every resin including fluorine in a molecule, and it includes a Polytetrafluoroethylene, PTFE, a Polychlorotrifluoroethylene PCTFE, a PolyVinyliDene Fluoride PVDF, a Fluorinated ethylene propylene FEP, an Ethyl Tetra Fluoro Ethylene ETFE or a Perfluoroalkoxy alkane PFA, etc. This fluorine resin has excellent heat resistance, excellent chemical resistance, excellent electric insulation, small friction coefficient, and does not have adhesion.

The liner <NUM> may be in a body and it may include a liner body member 320a, a first liner connection member 320b, a first liner flange member 320c, a second liner connection member 320d and a second liner flange member 320e.

In one embodiment, the first fluid flow space 310a through which the fluid flows may be formed in the first liner flange member 320c, the first liner connection member 320b and the liner body member 320a, and the second fluid flow space 310b may be formed in the second liner flange member 320e, the second liner connection member 320d and the liner body member 320a. That is, the fluid flow space <NUM> may include the first fluid flow space 310a and the second fluid flow space 310b. Accordingly, the fluid inputted to the first fluid flow space 310a may be outputted through the second fluid flow space 310b.

The first liner flange member 320c may be disposed in the first body flange member <NUM>, and one side of the first liner flange member 320c may be exposed outside.

The second liner flange member 320e may be disposed in the second body flange member <NUM>, and one side of the second liner flange member 320e may be exposed outside.

The metal member may surround the liner <NUM> and be included in the body, as shown in <FIG> and <FIG>. Here, whole of the metal member is included in the body, and none part of the metal member may be exposed outside. That is, the liner <NUM> locates in the metal member, and the whole of the metal member may be included in the body. However, a part of the metal member may be exposed at partial of an internal surface of the body flange member.

In one embodiment, the metal member may include a first sub metal member <NUM> and a second sub metal member <NUM>. For example, the metal member may include two sub metal members <NUM> and <NUM> with different shape. Here, the sub metal members <NUM> and <NUM> may be independent members.

The first sub metal member <NUM> may be in a body, cover a part of the liner <NUM>, and include a first sub metal body member 330a, a <NUM>-<NUM> sub metal connection member 330b, a <NUM>-<NUM> sub metal flange member 330c, a <NUM>-<NUM> sub metal connection member 330d and a <NUM>-<NUM> sub metal flange member 330e.

The first sub metal body member 330a may surround a part of the liner body member 320a and have a curved shape.

The <NUM>-<NUM> sub metal flange member 330c may be connected to an end part of the first sub metal body member 330a through the <NUM>-<NUM> sub metal connection member 330b and close to the first liner flange member 320c while it is disposed just beneath the first liner flange member 320c. Particularly, a groove curve line formed at a central part of the <NUM>-<NUM> sub metal flange member 330c may surround a part of the first liner connection member 320b just beneath the first liner flange member 320c, curvature of the groove curve line being the same as or similar to that of the first liner connection member 320b.

In one embodiment, a width of the <NUM>-<NUM> sub metal flange member 330c is higher than that of the first liner flange member 320c. As a result, at least part of the <NUM>-<NUM> sub metal flange member 330c may be projected outside the first liner flange member 320c in a width direction when the <NUM>-<NUM> sub metal flange member 330c surrounds the first liner connection member 320b, as shown in <FIG>. Here, the first liner flange member 320c may be projected compared to the <NUM>-<NUM> sub metal flange member 330c in a longitudinal direction.

On the other hand, the <NUM>-<NUM> sub metal flange member 330c might surround directly the first liner flange member 320c. In this case, the pump may have unstable structure because a space exists between the liner <NUM> and the metal member. Accordingly, it is effective that the <NUM>-<NUM> sub metal flange member 330c surrounds the first liner connection member 320b just beneath the first liner flange member 320c while the <NUM>-<NUM> sub metal flange member 330c closes to the first liner flange member 320c.

At least one hole may be formed on the <NUM>-<NUM> sub metal flange member 330c, a fixing member passing through the hole. That is, the fixing member passes the hole of the first body flange member <NUM> and the hole of the <NUM>-<NUM> sub metal flange member 330c when the pump is combined with the piping.

The <NUM>-<NUM> sub metal flange member 330e may be connected to the other end part of the first sub metal body member 330a through the <NUM>-<NUM> sub metal connection member 330d and close to the second liner flange member 320e while it is disposed just beneath the second liner flange member 320e. Particularly, a groove curve line formed at a central part of the <NUM>-<NUM> sub metal flange member 330e may surround a part of the second liner connection member 320d just beneath the second liner flange member 320e, curvature of the groove curve line being the same as or similar to that of the second liner connection member 320d.

In one embodiment, a width of the <NUM>-<NUM> sub metal flange member 330e is higher than that of the second liner flange member 320e. As a result, at least part of the <NUM>-<NUM> sub metal flange member 330e may be projected outside the second liner flange member 320e in a width direction when the <NUM>-<NUM> sub metal flange member 330e surrounds the second liner connection member 320d, as shown in <FIG>. Here, the second liner flange member 320e may be projected compared to the <NUM>-<NUM> sub metal flange member 330e in a longitudinal direction.

On the other hand, the <NUM>-<NUM> sub metal flange member 330e might surround directly the second liner flange member 320e. In this case, the pump may have unstable structure because a space exists between the liner <NUM> and the metal member. Accordingly, it is effective that the <NUM>-<NUM> sub metal flange member 330e surrounds the second liner connection member 320d just beneath the second liner flange member 320e while the <NUM>-<NUM> sub metal flange member 330e closes to the second liner flange member 320e.

At least one hole may be formed on the <NUM>-<NUM> sub metal flange member 330e, a fixing member passing through the hole. That is, the fixing member passes the hole of the second body flange member <NUM> and the hole of the <NUM>-<NUM> sub metal flange member 330e when the pump is combined with the piping.

On the other hand, the <NUM>-<NUM> sub metal flange member 332c may have a shape of doughnuts cut by half, end sections except the groove curve line may be contacted with end sections of the <NUM>-<NUM> sub metal flange member 330c. That is, the metal member may surround the liner <NUM> while the end sections of the <NUM>-<NUM> sub metal flange member 330c are contacted with the end sections of the <NUM>-<NUM> sub metal flange member 332c. Here, the <NUM>-<NUM> sub metal flange member 330c has also shape of doughnuts cut by half.

The second sub metal member <NUM> may be in a body, cover the other part of the liner <NUM>, and include a second sub metal body member 332a, a <NUM>-<NUM> sub metal connection member 332b, a <NUM>-<NUM> sub metal flange member 332c, a <NUM>-<NUM> sub metal connection member 332d and a <NUM>-<NUM> sub metal flange member 332e.

In one embodiment, the first sub metal member <NUM> may surround a part of the liner <NUM>, and the second sub metal member <NUM> may surround the other part of the liner <NUM>. That is, the sub metal members <NUM> and <NUM> may surround whole of the liner <NUM>.

The second sub metal body member 332a may surround the other part of the liner body member 320a and have a curved shape.

The <NUM>-<NUM> sub metal flange member 332c may be connected to an end part of the second sub metal body member 332a through the <NUM>-<NUM> sub metal connection member 332b and close to the first liner flange member 320c while it is disposed just beneath the first liner flange member 320c. Particularly, a groove curve line formed at a central part of the <NUM>-<NUM> sub metal flange member 332c may surround a part of the first liner connection member 320b just beneath the first liner flange member 320c, curvature of the groove curve line being the same as or similar to that of the first liner connection member 320b.

In one embodiment, a width of the <NUM>-<NUM> sub metal flange member 332c is higher than that of the first liner flange member 320c. As a result, at least part of the <NUM>-<NUM> sub metal flange member 332c may be projected outside the first liner flange member 320c in a width direction when the <NUM>-<NUM> sub metal flange member 332c surrounds the first liner connection member 320b, as shown in <FIG>. Here, the first liner flange member 320c may be projected compared to the <NUM>-<NUM> sub metal flange member 332c in a longitudinal direction.

On the other hand, the <NUM>-<NUM> sub metal flange member 332c might surround directly the first liner flange member 320c. In this case, the pump may have unstable structure because a space exists between the liner <NUM> and the metal member. Accordingly, it is effective that the <NUM>-<NUM> sub metal flange member 332c surrounds the first liner connection member 320b just beneath the first liner flange member 320c while the <NUM>-<NUM> sub metal flange member 332c closes to the first liner flange member 320c.

At least one hole may be formed on the <NUM>-<NUM> sub metal flange member 332c, a fixing member passing through the hole. That is, the fixing member passes the hole of the first body flange member <NUM> and the hole of the <NUM>-<NUM> sub metal flange member 332c when the pump is combined with the piping.

The <NUM>-<NUM> sub metal flange member 332e may be connected to the other end part of the second sub metal body member 332a through the <NUM>-<NUM> sub metal connection member 332d and close to the second liner flange member 320e while it is disposed just beneath the second liner flange member 320e. Particularly, a groove curve line formed at a center of the <NUM>-<NUM> sub metal flange member 332e may surround a part of the second liner connection member 320d just beneath the second liner flange member 320e, curvature of the groove curve line being the same as or similar to that of the second liner connection member 320d.

In one embodiment, a width of the <NUM>-<NUM> sub metal flange member 332e is higher than that of the second liner flange member 320e. As a result, at least part of the <NUM>-<NUM> sub metal flange member 332e may be projected outside the second liner flange member 320e in a width direction when the <NUM>-<NUM> sub metal flange member 332e surrounds the second liner connection member 320d, as shown in <FIG>. Here, the second liner flange member 320e may be projected compared to the <NUM>-<NUM> sub metal flange member 332e in a longitudinal direction.

On the other hand, the <NUM>-<NUM> sub metal flange member 332e might surround directly the second liner flange member 320e. In this case, the pump may have unstable structure because a space exists between the liner <NUM> and the metal member. Accordingly, it is effective that the <NUM>-<NUM> sub metal flange member 332e surrounds the second liner connection member 320d just beneath the second liner flange member 320e while the <NUM>-<NUM> sub metal flange member 332e closes to the second liner flange member 320e.

At least one hole may be formed on the <NUM>-<NUM> sub metal flange member 332e, a fixing member passing through the hole. That is, the fixing member passes the hole of the second body flange member <NUM> and the hole of the <NUM>-<NUM> sub metal flange member 332e when the pump is combined with the piping.

On the other hand, the <NUM>-<NUM> sub metal flange member 332e may have a shape of doughnuts cut by half, end sections except the groove curve line may be contacted with end sections of the <NUM>-<NUM> sub metal flange member 330e. That is, the metal member may surround the liner <NUM> while the end sections of the <NUM>-<NUM> sub metal flange member 330e are contacted with the end sections of the <NUM>-<NUM> sub metal flange member 332e. Here, the <NUM>-<NUM> sub metal flange member 330e has also a shape of doughnuts cut by half.

In a manufacture process, the metal member may be formed in the body by using an insert molding. Particularly, the metal member may be included in the body and the liner <NUM> may be formed in the metal member by insert-molding a structure that the sub metal members <NUM> and <NUM> surround the liner <NUM> in a plastic which is material of the body.

At least one hole other than the hole for the fixing member may be formed on the flange members 330c, 330e, 332c, 332e of the metal member, so that the metal member is fixed in the body. In this case, melt plastic fills the hole in the insert molding, and thus the metal member may be strongly combined in the body. However, a permeate preventing member (not shown) may be inserted into the hole for the fixing member so that the melted plastic is not filled in the hole, and then the permeate preventing member may be removed after the insert molding is completed.

One or more projection members may be formed on the metal member to more strongly combine the metal member in the body.

To use two separated sub metal members <NUM> and <NUM> is for locating the liner <NUM> in the metal member. It is impossible to insert the liner <NUM> in the metal member because a width of the flange member 320c or 320e of the liner <NUM> or a width of the body member 320a is greater than an inner space of the metal member, if the metal member is in a body. Accordingly, two separated sub metal members <NUM> and <NUM> are used to locate the liner <NUM> including the flange member 320c or 320e or the body member 320a higher than the inner space of the metal member in the metal member.

The supporting member <NUM> may support the body.

In one embodiment, the supporting member <NUM> may be wholly formed of metal and be longitudinally extended from a lower part of the body member <NUM> to support the body. In this case, the supporting member <NUM> may be combined with the body after it is independently manufactured.

In another embodiment, the supporting member <NUM> may include a metal supporting member 340a and a plastic supporting member 340b as shown in <FIG>.

The metal supporting member 340a may be longitudinally extended from a lower part of the sub metal member and be formed in a body with the sub metal member.

The plastic supporting member 340b may surround the metal supporting member 340a and be formed together with the metal supporting member 340a when the insert molding is performed. Here, plastic of the plastic supporting member 340b may be formed of above material.

Accordingly, a process of forming the supporting member <NUM> is simple, and the supporting member <NUM> may support the casing with adequate force.

Shortly, the two sub metal members <NUM> and <NUM> may be included in the body formed of the plastic through the insert molding, while two sub metal members <NUM> and <NUM> surround the liner <NUM>. Here, the liner <NUM> may locate in the metal member.

Distortion may occur to the casing in a direction opposed to a combination direction due to a fixing force of a fixing member when the flange of the casing is combined with a flange of the piping through the fixing member, if the body formed of plastic surrounds directly a liner and the metal member does not surround the liner.

Distortion may not occur or be minimized to the casing because the flange is strengthened though the flange of casing is combined with the flange of a piping through the fixing member, when the metal member is included in the body formed of the plastic while the liner <NUM> is disposed in the metal member.

Of course, distortion may be prevented when the casing is combined with the piping, if the body is formed of metal and the liner <NUM> is included in the body. However, it is difficult to process the body and manufacturing cost of the casing may increase sharply. Additionally, corrosion may occur to the casing and lifetime of the casing may get shorter.

Accordingly, the casing of the pump is formed of the plastic, wherein the metal member locates in the body to reinforce strength.

It is difficult to process precisely the metal member and it is easy to process precisely the plastic. The casing may be realized with a desired shape though the plastic is precisely processed without processing precisely the metal member, when the casing is manufactured. That is, the casing may be easily embodied to have desired shape with low manufacturing cost, and distortion may be minimized when the casing is combined with the piping.

On the other hand, the flange member of the liner <NUM>, the flange member of the metal member and the flange member of the body form a flange. In view of the flange, a metal member is included in a plastic. As a result, distortion may be minimized though the flange of the pump is combined with the flange of the piping.

In the above description, the metal member comprises two sub metal members <NUM> and <NUM> disposed symmetrically with the same shape. However, the metal member may be formed with three or more sub metal members. Here, the liner <NUM> may be disposed in the sub metal members and the sub metal members may be included in the body. The sub metal members may have the same shape or at least one of the sub metal members may have different shape.

For example, three sub metal members, which are separately disposed by <NUM>° with the same shape, may surround the liner <NUM>. It is efficient that the metal member includes two sub metal members <NUM> and <NUM> in consideration of easiness of the process.

In another embodiment, the casing may not include the liner. That is, the casing may include a body and a metal member having a first sub metal member and a second metal member, without the liner.

In still another embodiment, the pump may include a liner <NUM>, a resin layer <NUM>, a metal member <NUM> and a body <NUM> disposed in sequence as shown in <FIG>. That is, unlike the above embodiment, the resin layer <NUM> may be disposed between the liner <NUM> and the metal member <NUM>.

In one embodiment, the resin layer <NUM> may be formed of the same material as the body <NUM>. The material of the body in the above embodiment may be used as the material of the body <NUM>.

If molding after inserting a structure that the sub metal members surround the liner <NUM> in a plastic corresponding to the material of the body <NUM> and the resin layer <NUM>, melted plastic permeates through a space between the liner <NUM> and the metal member <NUM> because a space exists between the sub metal members. As a result, the resin layer <NUM> may be formed between the liner <NUM> and the metal member <NUM>.

A hole may be formed on a part of the metal member <NUM> so that the melted plastic is easily permeated between the liner <NUM> and the metal member <NUM>.

The structure where the resin layer is formed between the liner and the metal member may be also applied to other embodiment.

Next, the drive member <NUM> will be described in detail.

In <FIG>, the drive member <NUM> of the present embodiment may include an adaptor <NUM>, a magnetic drive <NUM>, a strength reinforcement member <NUM>, a rear casing <NUM> and a drive shaft <NUM>. The drive member <NUM> may control rotation of the impeller <NUM> and prevent fluid from being leaked.

The adaptor <NUM> may connect the casing <NUM> to the motor <NUM>.

The magnetic drive <NUM> may be combined with the drive shaft <NUM> formed at a central part of the adaptor <NUM>. Here, the drive shaft <NUM> is connected to an axis of the motor <NUM>, and thus the magnetic drive <NUM> rotates in response to rotation of the axis of the motor <NUM>.

In one embodiment, the magnetic drive <NUM> may include a drive body <NUM> and at least one magnet <NUM>, a hole, a cavity or a home (the words home and cavity can be used in an interchangeable manner) receiving the strength reinforcement member <NUM> being formed on the drive body <NUM> as shown in <FIG>, and the drive shaft <NUM> may be connected to an end part of the magnetic drive <NUM>. Accordingly, the magnetic drive <NUM> rotates when the drive shaft <NUM> in response to rotation of the axis of the motor <NUM>.

In one embodiment, a home is formed along an outer perimeter surface of an end part of the drive shaft <NUM>, and a protrusion part is formed along an outer perimeter surface of an end part of the drive body <NUM>. In this condition, the drive shaft <NUM> may be combined with the drive body <NUM> by inserting the protrusion part into the home of the drive shaft <NUM>. This combination may be formed through following insert molding.

The magnet <NUM> may be for example a permanent magnet, and it may be combined in a home <NUM> formed on an internal surface of the drive body <NUM> as shown in <FIG>. For example, the magnet <NUM> may be combined with the drive body <NUM> through an adhesive in the home <NUM>.

The magnets <NUM> may be disposed with a circular shape in constant interval, and each of the magnets <NUM> may be disposed on partial area of the drive body <NUM> in a longitudinal direction of the drive body <NUM>.

Every of a bottom surface corresponding to the home <NUM> of the drive body <NUM> and a surface of the magnet <NUM> contacted with the bottom surface may be plane or curve. Since the drive body <NUM> may be formed of plastic as described below, it is efficient that the bottom surface and the surface of the magnet <NUM> are plane. This is because it is difficult to process the magnet <NUM> to have curve.

The magnet <NUM> is adhered in the home <NUM> of the drive body <NUM> in <FIG>. However, the magnet <NUM> may be adhered to the internal surface of the drive body <NUM> through adhesive, without the home <NUM>. In this case, the surface of the magnet <NUM> contacted with the internal surface may have a curved shape because the internal surface of the drive body <NUM> has a curved shape.

In one embodiment, the drive body <NUM> may be formed of plastic, and the drive shaft <NUM> may be formed of metal.

If every of the drive body <NUM> and the drive shaft <NUM> is formed of metal, durability of the magnetic drive <NUM> is excellent, but it is difficult to process precisely the drive body <NUM> and the drive shaft <NUM>. Furthermore, it is necessary to coat the drive body <NUM> and the drive shaft <NUM> for the purpose of preventing corrosion of the drive body <NUM> and the drive shaft <NUM>, and it should be process precisely the home <NUM> of the drive body <NUM> for combination with the magnet <NUM>. As a result, manufacture period of the magnetic drive <NUM> is long and manufacture cost of the magnetic dive <NUM> increases.

Accordingly, the pump of the invention may form the drive body <NUM> with plastic and form the drive shaft <NUM> with metal. In this case, it is easy to process the magnetic drive <NUM>, manufacture cost of the magnetic drive <NUM> reduces, and coating for protection of corrosion is not necessary.

In a manufacture process, the drive shaft <NUM> is manufactured through precise processing, the manufactured drive shaft <NUM> is inserted into a mold, and then the drive body <NUM> combined with the drive shaft <NUM> may be formed by pouring melted plastic material corresponding to the drive body <NUM> into the mold. That is, the drive body <NUM> combined with the drive shaft <NUM> may be manufactured through the insert molding.

Subsequently, the magnet <NUM> may be adhered in the home <NUM> formed on the internal surface of the drive body <NUM>.

If the drive body <NUM> combined with the drive shaft <NUM> is manufactured through the insert molding, mass production may be realized in less period of time, and it is not necessary to process precisely the home <NUM> in which the magnet <NUM> is adhered. Additionally, it is not necessary to perform coating for prevention of corrosion because the drive body <NUM> is formed of plastic. As a result, manufacture period of the magnetic drive <NUM> reduces, and so cost for manufacturing reduces and mass production may be realized.

The strength reinforcement member <NUM> may reinforce strength of the rear casing <NUM>. For example, home or hole is formed on a front surface of the strength reinforcement member <NUM> as shown in <FIG>, and the rear casing <NUM> may be inserted into the home or the hole.

The rear casing <NUM> may receive a magnet member 100b which is a rear part of the impeller <NUM>, thereby preventing leakage of fluid. Particularly, a home for receiving the magnet member 100b may be formed on a front surface of the rear casing <NUM>, and thus fluid outputted through the impeller <NUM> is blocked by the rear casing <NUM> so that the fluid is not leaked outside.

The impeller <NUM> may include a fluid delivery member 100a for delivering fluid transferred through the first fluid flow space 310a to the second fluid flow space <NUM>10b and the magnet member 100b connected to the fluid delivery member 100a.

At least one magnet may be formed on an internal surface of the magnet member 100b. The magnet may respond to the magnet <NUM> formed on the internal surface of the drive body <NUM>. As a result, the impeller <NUM> rotates by magnetic reaction when the drive body <NUM> rotates in response to rotation of the axis of the motor <NUM>.

In one embodiment, an N pole magnet and an S pole magnet may be alternatively disposed on the internal surface of the drive body <NUM>, and an N pole magnet and an S pole magnet may be alternatively disposed on an internal surface of the magnet member 100b.

The shaft <NUM> fixes a central part of the impeller <NUM> and may be combined with a ring <NUM> combined with the casing <NUM>. The ring <NUM> may prevent driving force and fix the shaft <NUM>.

Briefly, the drive member <NUM> rotates the impeller <NUM> through the magnetic reaction, wherein the drive body <NUM> may be formed of plastic and the drive shaft <NUM> may be formed of metal. The drive body <NUM> combined with the drive shaft <NUM> may be manufactured through the insert molding.

On the other hand, the other elements may be modified as long as the drive body <NUM> is formed of plastic, the drive shaft <NUM> is formed of metal and the magnetic drive <NUM> rotates the impeller <NUM> through the magnetic reaction.

<FIG> is a view illustrating section of a magnetic drive according to an embodiment of the invention, and <FIG> is a view illustrating a metal member according to one embodiment of the invention.

In <FIG>, the magnetic drive <NUM> includes a drive body <NUM> and at least one magnet <NUM>, a hole and a home for receiving the strength reinforcement member <NUM> being formed on the drive body <NUM> as shown in <FIG>. The drive shaft <NUM> is connected to an end part of the magnetic drive <NUM>. Accordingly, the magnetic drive <NUM> rotates when the drive shaft <NUM> rotates according to rotation of an axis of the motor <NUM>.

The magnet <NUM> may be combined in a home <NUM> formed on an internal surface of the drive body <NUM> as shown in <FIG>. For example, the magnet <NUM> may be combined with the drive body <NUM> by using adhesive, in the home <NUM>.

The magnets <NUM> may be circularly disposed in a preset interval, and each of the magnets <NUM> may be disposed on only partial of the drive body <NUM> in a longitudinal direction of the drive body <NUM>. A bottom surface corresponding to the home <NUM> of the drive body <NUM> and a surface of the magnet <NUM> corresponding to the bottom surface may be plane or curve. It is efficient that the bottom surface and the surface of the magnet <NUM> are plane because the drive body <NUM> is formed of plastic as described below. This is because it is difficult to process the magnet <NUM> in a curved shape.

The magnet <NUM> is adhered in the home <NUM> of the drive body <NUM> in <FIG>, but the magnet <NUM> may be adhered to an internal surface of the drive body <NUM> through an adhesive without the home <NUM>. In this case, the surface of the magnet <NUM> contacted with the internal surface may have a curved shape because the internal surface of the drive body <NUM> has a curved shape.

According to the invention, the drive body <NUM> has a structure that a metal member <NUM> is formed in a plastic member <NUM>, and the drive shaft <NUM> is formed of metal.

That is, the metal member <NUM> is included in the drive body <NUM> and the drive shaft <NUM> and the metal member <NUM> are directly connected. Here, the plastic member <NUM> may be formed of engineering plastic.

Since the metal member <NUM> is included in the drive body <NUM>, the drive body <NUM> may have adequate strength, and so the drive body <NUM> may not be broken down though an external force is applied to the drive body <NUM>.

In one embodiment, the plastic member <NUM> may have a cylinder shape, and the metal member <NUM> may be formed along whole of outer circumference surface of the plastic member <NUM> under the condition that it is included in the plastic member <NUM>. That is, the drive body <NUM> may have a section shown in <FIG> in a longitudinal direction of the drive body <NUM>.

In another embodiment, at least one hole <NUM> may be formed on the metal member <NUM> as shown in <FIG>. In this case, melted plastic is filled in the hole <NUM> in an insert molding, and thus the metal member <NUM> may be more strongly combined in the plastic member <NUM>.

In a corresponding manufacture process, the drive shaft <NUM> and the metal member <NUM> directly connected to the drive shaft <NUM> are manufactured through precise processing, the manufactured drive shaft <NUM> and the metal member <NUM> are inserted into a mold, and then the drive body <NUM> combined with the drive shaft <NUM> is formed by pouring melted plastic material corresponding to the plastic member <NUM> of the drive body <NUM> into the mold. That is, the drive body <NUM> combined with the drive shaft <NUM> is manufactured through the insert molding.

If the drive body <NUM> combined with the drive shaft <NUM> is manufactured through the insert molding, mass production may be realized in less period of time, and it is not necessary to process precisely the home <NUM> in which the magnet <NUM> is adhered. Additionally, it is not necessary to perform coating for prevention of corrosion because the plastic member <NUM> exposed outside of the drive body <NUM> is formed of plastic. As a result, manufacture period of the magnetic drive <NUM> reduces, and so cost for manufacturing the magnetic drive <NUM> reduces and mass production may be realized.

In another embodiment which is not according to the invention, the drive shaft <NUM> and the metal member <NUM> may be separated. In this case, plastic layer exists between the drive shaft <NUM> and the metal member <NUM>.

In a corresponding manufacture process, the drive shaft <NUM> and the metal member <NUM> are individually manufactured through precise processing, the drive shaft <NUM> and the metal member <NUM> are inserted into a mold, and then the drive body <NUM> combined with the drive shaft <NUM> may be formed by pouring melted plastic material corresponding to the plastic member <NUM> of the drive body <NUM> into the mold.

Next, the magnet <NUM> may be adhered in the home <NUM> formed on the internal surface of the drive body <NUM>.

Shortly, the drive member <NUM> rotates the impeller <NUM> by using magnetic reaction. According to the invention, the drive body <NUM> has the structure that the metal member <NUM> is included in the plastic member <NUM>, the drive shaft <NUM> is formed of metal and the drive shaft <NUM> and the metal member <NUM> are directly connected. The drive body <NUM> combined with the drive shaft <NUM> may be manufactured through the insert molding.

On the other hand, the other elements may be variously modified as long as the drive body <NUM> has the structure that the metal member <NUM> is included in the plastic member <NUM>, the drive shaft <NUM> is formed of metal, the drive shaft <NUM> and the metal member <NUM> are directly connected and the magnetic drive <NUM> rotates the impeller <NUM> by using the magnetic reaction.

<FIG> is a view illustrating section of a magnetic drive according to another embodiment of the invention. <FIG> is a view illustrating structure of a metal member according to one embodiment of the invention, and <FIG> is a view illustrating schematically combination structure of a metal member and a magnet according to one embodiment of the invention.

In <FIG>, the magnetic drive <NUM> includes a drive body <NUM> and at least one magnet <NUM>, a hole and a home for receiving the strength reinforcement member <NUM> being formed on the drive body <NUM> as shown in <FIG> and <FIG>. The drive shaft <NUM> is connected to an end part of the magnetic drive <NUM>.

The magnet <NUM> may be for example a permanent magnet, and it may be directly combined with a metal member <NUM> in a space <NUM> formed on an internal surface of the drive body <NUM> as shown in <FIG>. For example, the magnet <NUM> may be adhered to a combination member 1122b of the metal member <NUM> by using an adhesive, in the space <NUM>.

According to the invention, the drive body <NUM> has a structure that the metal member <NUM> is included in a plastic member <NUM>, the drive shaft <NUM> is formed of metal and the drive shaft <NUM> and the metal member <NUM> are directly connected. That is, the metal member <NUM> is included in the drive body <NUM>. Here, the plastic member <NUM> may be formed of engineering plastic.

Since the metal member <NUM> is included in the drive body <NUM>, the drive body <NUM> may have adequate strength, and thus the drive body <NUM> may be broken down though an external force is applied to the drive body <NUM>.

In one embodiment, at least one hole <NUM> may be formed on the metal member <NUM> as shown in <FIG>. In this case, melted plastic is filled in the hole <NUM> when the insert molding is performed, and so the metal member <NUM> may be more strongly combined in the plastic member <NUM>.

In still another embodiment, the space <NUM> for exposing the metal member <NUM> may be formed on the internal surface of the drive body <NUM> as shown in <FIG>. The magnet <NUM> may be adhered to the metal member <NUM> in the space <NUM>. Adhesion when the magnet <NUM> is adhered to the metal member <NUM> may be greater than that when the magnet <NUM> is adhered to plastic.

In one embodiment, the metal member <NUM> includes a combination part 1122b to which the magnet <NUM> is adhered, thickness of the combination part 1122b being higher than that of the other part 1122a. As a result, the combination part 1122b may endure the weight of the magnet <NUM>. Cost of the metal member <NUM> increases when the other part 1122a has also great thickness. Accordingly, it is efficient to form only combination part 1122b combined with the magnet <NUM> with great thickness.

In one embodiment, a part <NUM> at which the metal member <NUM> and the magnet <NUM> are combined may have plane shape as shown in a left view in <FIG>, and corresponding part of the magnet <NUM> may have plane shape.

In another embodiment, the part <NUM> at which the metal member <NUM> and the magnet <NUM> are combined may have a curved shape as shown in a right view of <FIG>, and corresponding part of the magnet <NUM> may have a curved shape.

Shortly, the drive member <NUM> rotates impeller <NUM> by using magnet reaction. According to the invention, the drive body <NUM> has the structure that the metal member <NUM> is included in a plastic member <NUM>, the drive shaft <NUM> is formed of a metal and the drive shaft <NUM> and the metal member <NUM> are directly connected. The drive body <NUM> combined with the shaft <NUM> may be manufactured through the insert molding.

Hereinafter, material of a body of the casing <NUM> or the drive body will be described in detail.

The body of the casing <NUM> or the drive body may be formed by mixing a glass fiber with a Polyvinyl Chloride PVC, a polypropylene PP, a Poly Phenylene sulfide PPS, a Polyphthalamide PPA, a Polyamide PA6, a Polyamide PA66, a Polyketone POK or a Polyethylene PE. As a result, strength, impact resistance and mechanical feature of the body of the casing <NUM> or the drive body may be enhanced.

In another embodiment, the body of the casing <NUM> or the drive body may be formed by mixing a glass fiber and a carbon fiber with for example, a PVC, a PP, a PPS, a PPA, a PA6, a PA66, a POK or a PE. Accordingly, strength, impact resistance and mechanical feature of the body of the casing <NUM> or the drive body may be enhanced.

In still another embodiment, the body of the casing <NUM> or the drive body may be formed by mixing a glass fiber, a carbon fiber and a graphite fiber with for example, a PVC, a PP, a PPS, a PPA, a PA6, a PA66, a POK or a PE. Here, composition of the glass fiber, the carbon fiber and graphite fiber may be <NUM>:<NUM>:<NUM>. As a result, strength, impact resistance and mechanical feature of the body of the casing <NUM> or the drive body may be enhanced.

Hereinafter, composition and an experimental result of the body of the casing <NUM> or the drive body will be described.

In one embodiment, the body of the casing <NUM> or the drive body may be formed by mixing a PP with a glass fiber. Preferably, the glass fiber has a weight percent higher than <NUM> weight percent and less than <NUM> weight percent, and the PP has a weight percent higher than <NUM> weight percent. Experimental result is shown in following table <NUM>.

It is verified through the above table <NUM> that tensile strength of the body of the casing <NUM> or the drive body when the body of the casing <NUM> or the drive body is formed by mixing the PP with the glass fiber is very greater than that of a body or a drive body formed of only the PP. That is, mechanical property and chemical property may be enhanced. However, it is difficult to manufacture the body of the casing <NUM> or the drive body to have desired shape because an insert molding feature for manufacturing the body of the casing <NUM> or the drive body is deteriorated when the glass fiber has a weight percent higher than <NUM> weight percent. In another embodiment, the body of the casing <NUM> or the drive body may be formed by mixing a PPS with a glass fiber. Preferably, the glass fiber has a weight percent higher than <NUM> weight percent and less than <NUM> weight percent, and the PPS has a weight percent higher than <NUM> weight percent. Experimental result is shown in following table <NUM>.

It is verified through the above table <NUM> that tensile strength of the body of the casing <NUM> or the drive body when the body of the casing <NUM> or the drive body is formed by mixing the PPS with the glass fiber is very greater than that of a body or a drive body formed of only the PPS. That is, mechanical property and chemical property may be enhanced, and thus light and strong body of the casing <NUM> or drive body may be formed. However, it is difficult to manufacture the body of the casing <NUM> or the drive body to have desired shape because an insert molding feature for manufacturing the body of the casing <NUM> or the drive body is deteriorated when the glass fiber has a weight percent higher than <NUM> weight percent. In still another embodiment, the body of the casing <NUM> or the drive body may be formed by mixing a PPA with a glass fiber. Preferably, the glass fiber has a weight percent higher than <NUM> weight percent and less than <NUM> weight percent, and the PPA has a weight percent higher than <NUM> weight percent. Experimental result is shown in following table <NUM>.

It is verified through the above table <NUM> that tensile strength of the body of the casing <NUM> or the drive body when the body of the casing <NUM> or the drive body is formed by mixing the PPA with the glass fiber is very greater than that of a body or a drive body formed of only the PPA. That is, mechanical property and chemical property may be enhanced, and thus light and strong body of the casing <NUM> or drive body may be formed. However, it is difficult to manufacture the body of the casing <NUM> or the drive body to have desired shape because an insert molding feature for manufacturing the body of the casing <NUM> or the drive body is deteriorated when the glass fiber has a weight percent higher than <NUM> weight percent. In still another embodiment, the body of the casing <NUM> or the drive body may be formed by mixing a PA6 with a glass fiber. Preferably, the glass fiber has a weight percent higher than <NUM> weight percent and less than <NUM> weight percent, and the PA6 has a weight percent higher than <NUM> weight percent. Experimental result is shown in following table <NUM>.

It is verified through the above table <NUM> that tensile strength of the body of the casing <NUM> or the drive body when the body of the casing <NUM> or the drive body is formed by mixing the PA6 with the glass fiber is very greater than that of a body or a drive body formed of only the PA6. That is, mechanical property and chemical property may be enhanced, and thus light and strong body of the casing <NUM> or drive body may be formed. However, it is difficult to manufacture the body of the casing <NUM> or the drive body to have desired shape because an insert molding feature for manufacturing the body of the casing <NUM> or the drive body is deteriorated when the glass fiber has a weight percent higher than <NUM> weight percent. In still another embodiment, the body of the casing <NUM> or the drive body may be formed by mixing a PA66 with a glass fiber. Preferably, the glass fiber has a weight percent higher than <NUM> weight percent and less than <NUM> weight percent, and the PA66 has a weight percent higher than <NUM> weight percent. Experimental result is shown in following table <NUM>.

It is verified through the above table <NUM> that tensile strength of the body of the casing <NUM> or the drive body when the body of the casing <NUM> or the drive body is formed by mixing the PA66 with the glass fiber is very greater than that of a body or a drive body formed of only the PA66. That is, mechanical property and chemical property may be enhanced, and thus light and strong body of the casing <NUM> or drive body may be formed. However, it is difficult to manufacture the body of the casing <NUM> or the drive body to have desired shape because an insert molding feature for manufacturing the body of the casing <NUM> or the drive body is deteriorated when the glass fiber has a weight percent higher than <NUM> weight percent. In still another embodiment, the body of the casing <NUM> or the drive body may be formed by mixing a POK with a glass fiber. Preferably, the glass fiber has a weight percent higher than <NUM> weight percent and less than <NUM> weight percent, and the POK has a weight percent higher than <NUM> weight percent. Experimental result is shown in following table <NUM>.

It is verified through the above table <NUM> that tensile strength of the body of the casing <NUM> or the drive body when the body of the casing <NUM> or the drive body is formed by mixing the POK with the glass fiber is very greater than that of a body or a drive body formed with only the POK. That is, mechanical property and chemical property may be enhanced, and thus light and strong body of the casing <NUM> or drive body may be formed. However, it is difficult to manufacture the body of the casing <NUM> or the drive body to have desired shape because an insert molding feature for manufacturing the body of the casing <NUM> or the drive body is deteriorated when the glass fiber has a weight percent higher than <NUM> weight percent.

Components in the embodiments described above can be easily understood from the perspective of processes. That is, each component can also be understood as an individual process. Likewise, processes in the embodiments described above can be easily understood from the perspective of components.

Claim 1:
A hybrid pump comprising:
an impeller (<NUM>);
a magnetic drive (<NUM>) configured to control rotation of the impeller (<NUM>);
a drive shaft (<NUM>) combined with the magnetic drive (<NUM>); and
a motor (<NUM>),
wherein the drive shaft (<NUM>) rotates in response to rotation of an axis of the motor (<NUM>), the magnetic drive (<NUM>) rotates when the drive shaft (<NUM>) rotates, the impeller (<NUM>) rotates in response to rotation of the magnetic drive (<NUM>),
a drive body (<NUM>, <NUM>) of the magnetic drive (<NUM>) has a plastic member (<NUM>, <NUM>) and a metal member (<NUM>, <NUM>) included in the plastic member (<NUM>, <NUM>), the drive shaft (<NUM>) is formed of metal,
the drive shaft (<NUM>) and the metal member (<NUM>, <NUM>) are directly connected.