EP3045735A1 - Electric pump - Google Patents
Electric pump Download PDFInfo
- Publication number
- EP3045735A1 EP3045735A1 EP16151193.6A EP16151193A EP3045735A1 EP 3045735 A1 EP3045735 A1 EP 3045735A1 EP 16151193 A EP16151193 A EP 16151193A EP 3045735 A1 EP3045735 A1 EP 3045735A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electric pump
- leak
- pump according
- enclosure
- bushing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004020 conductor Substances 0.000 claims abstract description 19
- 238000007789 sealing Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 7
- 230000001012 protector Effects 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 5
- 238000004026 adhesive bonding Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 239000003989 dielectric material Substances 0.000 claims description 2
- 239000000499 gel Substances 0.000 claims description 2
- -1 polypropylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000003921 oil Substances 0.000 claims 1
- 235000019198 oils Nutrition 0.000 claims 1
- 235000015112 vegetable and seed oil Nutrition 0.000 claims 1
- 239000008158 vegetable oil Substances 0.000 claims 1
- 230000001360 synchronised effect Effects 0.000 description 7
- 238000013021 overheating Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 238000010409 ironing Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005475 siliconizing Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
- F04D29/5893—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps heat insulation or conduction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
- A47L15/4225—Arrangements or adaption of recirculation or discharge pumps
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/42—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to filters or pumps
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/44—Current or voltage
- D06F2103/48—Current or voltage of the motor driving the pump
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/08—Liquid supply or discharge arrangements
- D06F39/083—Liquid discharge or recirculation arrangements
- D06F39/085—Arrangements or adaptations of pumps
Definitions
- the present invention relates to electric pumps, and more specifically to pumps comprising a motor with at least one coil.
- Such pumps are used in washing machines or dishwashers, for example, to drain, at the end of a washing cycle, the water contained in the washing drum or tub out or towards a recirculation conduit that introduces said water back in again for that it is treated again.
- a fluid usually water
- Such pumps are clearly two functional parts, the first refers to the part where the fluid is prepared so that it can be expelled through an expulsion element or impeller, and the second refers to the part where said element is made to rotate in order to allow driving said fluid.
- Synchronous, preferably brushless, motors are normally used in such pumps, although asynchronous motors can also be used.
- a synchronous motor is a type of AC (alternate current) motor in which the rotation of the shaft of the rotor that moves the impeller is synchronized with the frequency of the supply current.
- the magnetic field required to make the shaft of the rotor rotate is generated by circulating an electric current through a coil arranged around the stator.
- ES1101080 U discloses a drain pump comprising a pump body, in connection with the hydraulic part, and a motor body, in connection with the motorized part of the pump.
- the motor body comprises an enclosure coupled to the pump body to close the pump at one end, an impeller arranged on one side of the enclosure and a synchronous motor arranged on the other side of the enclosure.
- the synchronous motor comprises a stator with a winding and a rotor with a shaft which is coupled to the impeller.
- the object of the invention is to provide an electric pump, as defined in the claims.
- the electric pump of the invention comprises a pump body and a motor body.
- the motor body comprises an enclosure by means of which it is coupled to the pump body, a rotatable impeller, and an electric motor, preferably synchronous one.
- the impeller is arranged on one side of the enclosure whereas the motor is arranged on the other side.
- the electric motor comprises a stator, at least one stator coil and a rotor comprising a shaft cooperating with the impeller.
- the pump also comprises a cover attached to the enclosure such that a leak-tight chamber is formed therein.
- the stator and coil/coils are arranged inside the leak-tight chamber, and said chamber is filled with a thermally conductive material.
- the pump of the invention helps to improve thermal dissipation of heat losses of the electric motor such that the performance of the motor itself is improved because the reduction of the temperature of the winding as well as of other parts of the motor is optimized, making it possible to reduce the size of the electric motor, being able to save in materials.
- the noise generated by the electric motor is also advantageously reduced as a result of the vibrations being dampened by the conductive material.
- the electric pump 1 comprises a pump body 2, in connection with the hydraulic part of the pump 1, and a motor body 3, in connection with the motorized part of the pump 1.
- the motor body 3 comprises an enclosure 4 by means of which said motor body 3 is coupled at one end of the pump body 2, enabling the closure thereof at said end.
- the other end of the pump body 2 is closed with a filter 2a which is arranged inside the pump body 2, as seen in Figure 1 .
- the pump 1 also comprises an impeller 5 and an electric motor, preferably a synchronous one.
- the impeller 5 is arranged on one side of the enclosure 4 whereas the electric motor is arranged on the other side, as shown in Figures 1 and 2 .
- the motor of the invention which is either single-phase or polyphase, comprises at least one assembly formed by a stator 6 and at least one stator coil 6a, and a rotor 7 comprising a shaft 7a cooperating with the impeller 5.
- the pump 1 also comprises a cover 8 attached to the enclosure 4 in a leak-tight manner such that a leak-tight chamber 9 is formed therein.
- the stator 6 and the stator coil 6a are arranged inside the leak-tight chamber 9 and said chamber 9 is filled with a thermally conductive material, such that the heat generated in said motor, which is usually generated by the passage of an electric current, is quickly evacuated as it is transferred primarily by conduction to another point, usually into the atmosphere, thereby preventing the motor from overheating. This allows the stator coil 6a of the motor to work in a smaller temperature range, fully assuring compliance with the corresponding safety regulation.
- the pump 1 allows reducing the volume of the conductor of the stator coil 6a, i.e., less material in the stator coil 6a, reducing the material of the stator 6 (for example by designing a stator 6 that is less thick, etc.) also being possible, such that significant savings in material costs and a weight reduction can be achieved.
- the current circulating through the stator coil 6a is inversely proportional to the impedance opposing the stator coil 6a itself, i.e., the wire of the stator coil 6a, the longer the length of the winding the more it opposes the passage of electric current, so current intensity is lower. Similarly, the shorter the length of the winding the less it opposes the passage of electric current, so current intensity is greater, but since the pump 1 of the invention dissipates heat losses quickly and efficiently, the motor is prevented from overheating, allowing the stator coil 6a to continue working in the same temperature range.
- the pump 1 according to the first embodiment of the invention comprises a single coil 6a.
- the pump 1 can also comprise several coils.
- the electric motor 20 of the invention also operates quieter as a result of the conductive material dampening vibrations generated within the motor 20.
- the thermally conductive material that is arranged in the leak-tight chamber 9 can be a fluid, preferably a liquid, gel or solid. Out of all the fluids used, use of air is not advised because the heat transfer due to convection provided by air is very slow.
- the thermally conductive material is an oil which provides faster cooling (by convection and conduction) than the cooling produced exclusively by convection.
- the stator coil 6a is arranged inside the leak-tight chamber 9 which is filled with oil, providing a chamber 9 with lack of oxygen. Since there is a lack of oxygen, the galvanic corrosion of the wire of the stator coil 6a is avoided as well as the corrosion of any component disposed inside the leak-tight chamber 9. Indeed, in the hypothetical case that the motor 20 overheats, propagation of a possible flame would be avoided because this lack of oxygen.
- said thermally conductive material is a dielectric material which avoids having to isolate elements such as the stator coil 6a, the stator 6, etc.
- the pump 1 of the invention further comprises a thermal protector 17, for example a bimetal switch, connected in series with the coil 6a and the power source of the electric motor 20 in a known manner.
- Said thermal protector 17 is configured to interrupt the current circulating through the coil 6a in case of overheating.
- the thermal protector 17 is disposed inside the leak-tight chamber 9 as can be seen in Figure 4 , and therefore it is in contact with the thermally conductive material.
- the enclosure 4 comprises a closure profile 4a, such as that shown in Figure 3 , axially projecting from the side where the electric motor is arranged, and the cover 8 comprises in the contour of the free end an engagement profile 8a cooperating with the closure profile 4a of the enclosure 4, as shown in the detail of Figure 5 .
- said engagement profile 8a comprises a U shape, such that the closure profile 4a of the enclosure 4 is introduced by means of form fitting, thereby being housed therein.
- a sealing operation is carried out, for example by means of laser, welding, ultrasound, hot-ironing, gluing, siliconizing, etc. A leak-tight attachment is thereby ensured without having to use elastic joints.
- an electric motor comprises terminals 12 enabling the connection of said motor to an external power source.
- the terminals 12 of the pump 1 of the invention are at least partly disposed inside the leak-tight chamber 9, preferably at least the part that is connected with the coil 6a and are therefore in contact with the thermally conductive material.
- the conductive material more readily dissipates the heat to reduce the likelihood of plastic deformation of surrounding plastic components and the occurrence of flame.
- the enclosure 4 comprises, preferably in the front or rear lower part, an opening 11 that allows the passage of said terminals 12. In this embodiment of the invention, however, it is necessary to also seal said opening 11 so that the chamber 9 is actually leak-tight.
- the pump 1 of the first embodiment of the invention comprises a bushing 13 arranged in said opening 11 in a leak-tight manner, as shown in Figure 4 .
- said bushing 13 is made of plastic, preferably rigid, which is attached to the enclosure 4 by carrying out a subsequent sealing operation around the periphery of the opening 11 as can be seen in more detail in figure 6A , for example by welding or gluing.
- the terminals 12 are assembled and then a resin is applied over the bushing 13 and the terminals 12, so that an elastic sealing 16 is formed and therefore the terminals 12 are sealed in a leak-tight manner.
- the bushing 13, which is also arranged in said opening 11 in a leak-tight manner comprises an elastic part, referred to as sealing bushing 13', which is arranged at the end of the bushing 13 that is arranged close to the electric motor 20, as shown in the detail of Figure 6B .
- Said sealing bushing 13' comprises an elastic area cooperating with the opening 11. In this embodiment of the invention, said elastic area is in contact with the inner face of the opening 11, as seen in Figure 6B .
- the elastic area cooperating with the edge of the opening 11 of the bushing 13 comprises close to the end an elastic profile 15 having a larger section in the entire area of contact with the opening 11.
- the elastic profile 15 is deformed and applies pressure against the inner face of the opening 11.
- the elastic profile 15 is shown arranged in the opening 11 of the enclosure 4, but without deforming so that the initial shape of said elastic profile 15 can be seen better.
- an elastic joint can also be arranged between the bushing 13 and the opening 11.
- the sealing bushing 13' of this alternative embodiment also comprises a constricted and elastic area 14 for each terminal 12, depicted in Figure 6B , cooperating with the corresponding terminal 12 in a manner that the terminals 12 pass through therein.
- the side 21 through which the corresponding terminal 12 must be introduced is the wider side so as to make guiding the terminal 12 easier.
- the opposite side i.e. the side through which the terminal 12 exits, is sized so that it is able to close up around the corresponding terminals 12. In the non-limiting example of the invention, said opposite side closes up, forming a thin membrane 22 that breaks when the corresponding terminal 12 is introduced, such that when the terminal 12 is introduced the narrowest area of said constricted area 14 comes into contact with said terminal 12, also applying pressure against the terminal 12.
- the bushing 13 is interchangeable, therefore it can be adapted to different types and positions of the terminals 12, allowing greater versatility of the pump 1, because it is adaptable to different types of electrical connections.
- the cover 8 is formed by a single part but it is not ruled out that the cover 8 can comprise several parts attached to one another in a leak-tight manner to form the cover 8, or that it even comprises a single part but with different materials.
- This latter variant can be useful, for example, in obtaining a cover 8 with different materials and geometries that help to direct and optimize outward heat transfer.
- the cover 8 of the pump 1 of the invention is preferably made of the same material as the enclosure 4, being made of plastic, preferably polypropylene, in the non-limiting example of the embodiment of the invention. As already mentioned in the preceding paragraph, is it not ruled out that the cover 8 may comprise more than one material either.
- said cover 8 comprises in its outer contour a plurality of fins 10 projecting in perpendicular, as shown in Figure 7 , such that the surface of contact, usually with the atmosphere, increases.
- This configuration allows further accelerating cooling, i.e., heat transfer, of the electric motor of the pump 1 of the invention because on one hand, heat is quickly evacuated from the motor by conduction as a result of the conductive material arranged in the leak-tight chamber 9, and on the other hand the evacuation of said heat is optimized by convection into the atmosphere.
- Such pumps are used for moving or driving a fluid, preferably water, and are normally used in dry environments.
- a fluid preferably water
- An application of this type can be, for example, in drain pumps or recirculation pumps in home appliances, such as a washing machine or a dishwasher, or in driers.
- the pump 1 of the invention since in the pump 1 of the invention the chamber 9 in which the stator 6 and the stator coil 6a are housed is leak-tight, use of the pump 1 in another type of environments is enabled, such as in environments with a high level of humidity, it also being possible for the pump 1 of the invention to work immersed in a liquid. Therefore, the pump 1 of the invention is also suitable for being used in fish tanks, aquariums or similar devices.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
- The present invention relates to electric pumps, and more specifically to pumps comprising a motor with at least one coil.
- Using electric pumps to drive a fluid, usually water, is known. Such pumps are used in washing machines or dishwashers, for example, to drain, at the end of a washing cycle, the water contained in the washing drum or tub out or towards a recirculation conduit that introduces said water back in again for that it is treated again. In such pumps there are clearly two functional parts, the first refers to the part where the fluid is prepared so that it can be expelled through an expulsion element or impeller, and the second refers to the part where said element is made to rotate in order to allow driving said fluid.
- Synchronous, preferably brushless, motors are normally used in such pumps, although asynchronous motors can also be used. A synchronous motor is a type of AC (alternate current) motor in which the rotation of the shaft of the rotor that moves the impeller is synchronized with the frequency of the supply current. The magnetic field required to make the shaft of the rotor rotate is generated by circulating an electric current through a coil arranged around the stator.
- In that sense,
ES1101080 U - The object of the invention is to provide an electric pump, as defined in the claims.
- The electric pump of the invention comprises a pump body and a motor body. The motor body comprises an enclosure by means of which it is coupled to the pump body, a rotatable impeller, and an electric motor, preferably synchronous one. The impeller is arranged on one side of the enclosure whereas the motor is arranged on the other side. The electric motor comprises a stator, at least one stator coil and a rotor comprising a shaft cooperating with the impeller.
- The pump also comprises a cover attached to the enclosure such that a leak-tight chamber is formed therein. The stator and coil/coils are arranged inside the leak-tight chamber, and said chamber is filled with a thermally conductive material.
- The pump of the invention helps to improve thermal dissipation of heat losses of the electric motor such that the performance of the motor itself is improved because the reduction of the temperature of the winding as well as of other parts of the motor is optimized, making it possible to reduce the size of the electric motor, being able to save in materials.
- The noise generated by the electric motor is also advantageously reduced as a result of the vibrations being dampened by the conductive material.
- These and other advantages and features of the invention will become evident in view of the drawings and detailed description of the invention.
-
-
Figure 1 shows a perspective view of a first embodiment of the electric pump according to the invention, with the pump body and the motor body uncoupled from one another. -
Figure 2 shows a perspective view of the motor body of the pump ofFigure 1 . -
Figure 3 shows a perspective view of the enclosure of the motor body ofFigure 2 . -
Figure 4 is a sectional view of the motor body ofFigure 2 . -
Figure 5 is a detail of the motor body ofFigure 2 . -
Figure 6A is a sectional view of a motor body of an electric pump according to the invention comprising one embodiment of the bushing. -
Figure 6B is another sectional view of a motor body of an electric pump according to the invention comprising another embodiment of the bushing. -
Figure 7 shows a perspective view of a second embodiment of the motor body. - The
electric pump 1 according to a first embodiment of the invention comprises a pump body 2, in connection with the hydraulic part of thepump 1, and amotor body 3, in connection with the motorized part of thepump 1. Themotor body 3 comprises an enclosure 4 by means of which saidmotor body 3 is coupled at one end of the pump body 2, enabling the closure thereof at said end. The other end of the pump body 2 is closed with afilter 2a which is arranged inside the pump body 2, as seen inFigure 1 . Thepump 1 also comprises animpeller 5 and an electric motor, preferably a synchronous one. Theimpeller 5 is arranged on one side of the enclosure 4 whereas the electric motor is arranged on the other side, as shown inFigures 1 and 2 . The motor of the invention, which is either single-phase or polyphase, comprises at least one assembly formed by a stator 6 and at least one stator coil 6a, and arotor 7 comprising a shaft 7a cooperating with theimpeller 5. - The
pump 1 also comprises acover 8 attached to the enclosure 4 in a leak-tight manner such that a leak-tight chamber 9 is formed therein. The stator 6 and the stator coil 6a are arranged inside the leak-tight chamber 9 and said chamber 9 is filled with a thermally conductive material, such that the heat generated in said motor, which is usually generated by the passage of an electric current, is quickly evacuated as it is transferred primarily by conduction to another point, usually into the atmosphere, thereby preventing the motor from overheating. This allows the stator coil 6a of the motor to work in a smaller temperature range, fully assuring compliance with the corresponding safety regulation. - On the other side, however, if working in the same temperature range is desirable, the
pump 1 according to this first embodiment allows reducing the volume of the conductor of the stator coil 6a, i.e., less material in the stator coil 6a, reducing the material of the stator 6 (for example by designing a stator 6 that is less thick, etc.) also being possible, such that significant savings in material costs and a weight reduction can be achieved. - The current circulating through the stator coil 6a is inversely proportional to the impedance opposing the stator coil 6a itself, i.e., the wire of the stator coil 6a, the longer the length of the winding the more it opposes the passage of electric current, so current intensity is lower. Similarly, the shorter the length of the winding the less it opposes the passage of electric current, so current intensity is greater, but since the
pump 1 of the invention dissipates heat losses quickly and efficiently, the motor is prevented from overheating, allowing the stator coil 6a to continue working in the same temperature range. - The
pump 1 according to the first embodiment of the invention comprises a single coil 6a. Optionally, thepump 1 can also comprise several coils. - The
electric motor 20 of the invention also operates quieter as a result of the conductive material dampening vibrations generated within themotor 20. - The thermally conductive material that is arranged in the leak-tight chamber 9 can be a fluid, preferably a liquid, gel or solid. Out of all the fluids used, use of air is not advised because the heat transfer due to convection provided by air is very slow.
- In the preferred embodiment of the invention, the thermally conductive material is an oil which provides faster cooling (by convection and conduction) than the cooling produced exclusively by convection.
- The stator coil 6a is arranged inside the leak-tight chamber 9 which is filled with oil, providing a chamber 9 with lack of oxygen. Since there is a lack of oxygen, the galvanic corrosion of the wire of the stator coil 6a is avoided as well as the corrosion of any component disposed inside the leak-tight chamber 9. Indeed, in the hypothetical case that the
motor 20 overheats, propagation of a possible flame would be avoided because this lack of oxygen. - Furthermore, in the preferred embodiment of the invention said thermally conductive material is a dielectric material which avoids having to isolate elements such as the stator coil 6a, the stator 6, etc.
- In the preferred embodiment, the
pump 1 of the invention further comprises athermal protector 17, for example a bimetal switch, connected in series with the coil 6a and the power source of theelectric motor 20 in a known manner. Saidthermal protector 17 is configured to interrupt the current circulating through the coil 6a in case of overheating. - In the preferred embodiment, the
thermal protector 17 is disposed inside the leak-tight chamber 9 as can be seen inFigure 4 , and therefore it is in contact with the thermally conductive material. Advantageously, thethermal protector 17, since it is in contact with the thermally conductive material, is more sensitive to the temperature variations of the coil 6a and therefore is able to react faster to cut power to themotor 20 in an overheating event. - To ensure the leak-tight closure between the enclosure 4 and the
cover 8, the enclosure 4 comprises aclosure profile 4a, such as that shown inFigure 3 , axially projecting from the side where the electric motor is arranged, and thecover 8 comprises in the contour of the free end anengagement profile 8a cooperating with theclosure profile 4a of the enclosure 4, as shown in the detail ofFigure 5 . - In this embodiment of the invention, said
engagement profile 8a comprises a U shape, such that theclosure profile 4a of the enclosure 4 is introduced by means of form fitting, thereby being housed therein. However, to ensure leak-tightness in the entire attachment joint once theclosure profile 4a has been fixed in theengagement profile 8a, in this first embodiment a sealing operation is carried out, for example by means of laser, welding, ultrasound, hot-ironing, gluing, siliconizing, etc. A leak-tight attachment is thereby ensured without having to use elastic joints. - Optionally, in a variant of this embodiment not shown in the drawings, between the
closure profile 4a of the enclosure 4 and theengagement profile 8a of thecover 8 there is arranged an elastic joint assuring the leak-tight attachment between saidclosure profile 4a and saidengagement profile 8a. The sealing process described in the preceding paragraph is thereby avoided. - As is known, an electric motor comprises
terminals 12 enabling the connection of said motor to an external power source. In the preferred embodiment, theterminals 12 of thepump 1 of the invention are at least partly disposed inside the leak-tight chamber 9, preferably at least the part that is connected with the coil 6a and are therefore in contact with the thermally conductive material. In this way, in the event of a short circuit where a local overheat can be generated near the connection area of theterminals 12 and the coil 6a, the conductive material more readily dissipates the heat to reduce the likelihood of plastic deformation of surrounding plastic components and the occurrence of flame. - The enclosure 4 comprises, preferably in the front or rear lower part, an
opening 11 that allows the passage of saidterminals 12. In this embodiment of the invention, however, it is necessary to also seal saidopening 11 so that the chamber 9 is actually leak-tight. - To that end, the
pump 1 of the first embodiment of the invention comprises abushing 13 arranged in saidopening 11 in a leak-tight manner, as shown inFigure 4 . In the preferred embodiment saidbushing 13 is made of plastic, preferably rigid, which is attached to the enclosure 4 by carrying out a subsequent sealing operation around the periphery of theopening 11 as can be seen in more detail infigure 6A , for example by welding or gluing. - In order to seal the
terminals 12, after sealing thebushing 13 and theopening 11 of the enclosure 4 in a leak-tight manner, theterminals 12 are assembled and then a resin is applied over thebushing 13 and theterminals 12, so that an elastic sealing 16 is formed and therefore theterminals 12 are sealed in a leak-tight manner. - Alternatively, in another embodiment of the invention in which a subsequent sealing operation is not necessary, the
bushing 13, which is also arranged in saidopening 11 in a leak-tight manner, comprises an elastic part, referred to as sealing bushing 13', which is arranged at the end of thebushing 13 that is arranged close to theelectric motor 20, as shown in the detail ofFigure 6B . Said sealing bushing 13' comprises an elastic area cooperating with theopening 11. In this embodiment of the invention, said elastic area is in contact with the inner face of theopening 11, as seen inFigure 6B . To ensure the leak-tight closure with theopening 11 of the enclosure 4, the elastic area cooperating with the edge of theopening 11 of thebushing 13 comprises close to the end anelastic profile 15 having a larger section in the entire area of contact with theopening 11. When thebushing 13 is introduced in theopening 11, theelastic profile 15 is deformed and applies pressure against the inner face of theopening 11. For the sake of clarity, theelastic profile 15 is shown arranged in theopening 11 of the enclosure 4, but without deforming so that the initial shape of saidelastic profile 15 can be seen better. Optionally, an elastic joint can also be arranged between thebushing 13 and theopening 11. - The sealing bushing 13' of this alternative embodiment also comprises a constricted and
elastic area 14 for each terminal 12, depicted inFigure 6B , cooperating with the correspondingterminal 12 in a manner that theterminals 12 pass through therein. Theside 21 through which the correspondingterminal 12 must be introduced is the wider side so as to make guiding the terminal 12 easier. The opposite side, i.e. the side through which the terminal 12 exits, is sized so that it is able to close up around the correspondingterminals 12. In the non-limiting example of the invention, said opposite side closes up, forming athin membrane 22 that breaks when the correspondingterminal 12 is introduced, such that when the terminal 12 is introduced the narrowest area of said constrictedarea 14 comes into contact with saidterminal 12, also applying pressure against the terminal 12. - In any of the embodiments, the
bushing 13 is interchangeable, therefore it can be adapted to different types and positions of theterminals 12, allowing greater versatility of thepump 1, because it is adaptable to different types of electrical connections. - In a preferred embodiment of the invention, the
cover 8 is formed by a single part but it is not ruled out that thecover 8 can comprise several parts attached to one another in a leak-tight manner to form thecover 8, or that it even comprises a single part but with different materials. This latter variant can be useful, for example, in obtaining acover 8 with different materials and geometries that help to direct and optimize outward heat transfer. - The
cover 8 of thepump 1 of the invention is preferably made of the same material as the enclosure 4, being made of plastic, preferably polypropylene, in the non-limiting example of the embodiment of the invention. As already mentioned in the preceding paragraph, is it not ruled out that thecover 8 may comprise more than one material either. - In another embodiment of the invention in which the invention differs from the first embodiment only with respect to the external configuration of the
cover 8, saidcover 8 comprises in its outer contour a plurality offins 10 projecting in perpendicular, as shown inFigure 7 , such that the surface of contact, usually with the atmosphere, increases. This configuration allows further accelerating cooling, i.e., heat transfer, of the electric motor of thepump 1 of the invention because on one hand, heat is quickly evacuated from the motor by conduction as a result of the conductive material arranged in the leak-tight chamber 9, and on the other hand the evacuation of said heat is optimized by convection into the atmosphere. - Such pumps, like the one described for the invention, are used for moving or driving a fluid, preferably water, and are normally used in dry environments. An application of this type can be, for example, in drain pumps or recirculation pumps in home appliances, such as a washing machine or a dishwasher, or in driers.
- However, since in the
pump 1 of the invention the chamber 9 in which the stator 6 and the stator coil 6a are housed is leak-tight, use of thepump 1 in another type of environments is enabled, such as in environments with a high level of humidity, it also being possible for thepump 1 of the invention to work immersed in a liquid. Therefore, thepump 1 of the invention is also suitable for being used in fish tanks, aquariums or similar devices.
Claims (17)
- Electric pump comprising a pump body (2) and a motor body (3), said motor body (3) comprising an enclosure (4) whereby it is coupled to the pump body (2), a rotatable impeller (5) arranged on one side of said enclosure (4), and an electric motor (20) arranged on the other side of the enclosure (4) comprising a stator (6), at least one stator coil (6a) and a rotor (7), said rotor (7) comprising a shaft (7a) cooperating with the impeller (5), characterized in that it also comprises a cover (8) attached to the enclosure (4) so that a leak-tight chamber (9) is formed therein, the stator (6) and the coil (6a) being arranged inside said leak-tight chamber (9), and said leak-tight chamber (9) being filled with a thermally conductive material.
- Electric pump according to claim 1, wherein said thermally conductive material is a fluid, preferably a liquid, gel or solid.
- Electric pump according to claim 2, wherein said material is an oil, preferably vegetable oil.
- Electric pump according to any of the preceding claims, wherein said material is dielectric material.
- Electric pump according to any of the preceding claims, wherein said thermally conductive material is in contact with the stator coil (6a).
- Electric pump according to any of the preceding claims, wherein the enclosure (4) comprises a closure profile (4a) axially projecting from the side where the electric motor (20) is arranged, the cover (8) comprising in the contour of the free end an engagement profile (8a) cooperating with the closure profile (4a) of the enclosure (4).
- Electric pump according to claim 6, wherein the engagement profile (8a) of the cover (8) comprises a U shape for housing the closure profile (4a) therein.
- Electric pump according to claim 6 or 7, wherein the closure profile (4a) of the enclosure (4) and the engagement profile (8a) of the cover (8) are fixed by pressure and attached to one another in a leak-tight manner after carrying out a subsequent sealing operation.
- Electric pump according to claims 6 or 7, wherein an elastic joint is arranged between the closure profile (4a) of the enclosure (4) and the engagement profile (8a) of the cover (8), ensuring a leak-tight attachment between said closure profile (4a) and said engagement profile (8a).
- Electric pump according to any of the preceding claims, wherein the enclosure (4) comprises an opening (11), preferably in the front or rear lower part, to allow the passage of the terminals (12) of the electric motor (20), a bushing (13) being housed in said opening (11) in a leak-tight manner, also sealing the terminals (12) in a leak-tight manner.
- Electric pump according to claim 10, wherein said bushing (13) comprises a sealing bushing (13') comprising an elastic area cooperating with the edge of the opening (11) and a constricted and elastic area (14) for each terminal (12) cooperating with the corresponding terminal (12).
- Electric pump according to claim 11, wherein the elastic area cooperating with the edge of the opening (11) of the bushing (13) comprises close to the end an elastic profile (15) having a larger section in the entire area of contact with the opening (11) for sealing said opening (11) in a leak-tight manner.
- Electric pump according to claims 10 to 12, wherein a bushing (13) is housed in said opening (11) in a leak-tight manner after being carried out a subsequent sealing operation as for example by welding or gluing, the bushing (13) comprising an elastic sealing (16) being formed by applying a resin over the bushing (13) and the terminals (12), wherein said elastic sealing (16) cooperates with the terminals (12) such that the terminals (12) are sealed in a leak-tight manner.
- Electric pump according to any of claims 10 to 13, wherein at least part of each terminal (12) is disposed inside the leak-tight chamber (9), preferably at least the part that is connected with the coil (6a), being therefore in contact with the thermally conductive material.
- Electric pump according to any of the preceding claims, wherein the cover (8) comprises in its outer contour a plurality of fins (10) projecting perpendicularly.
- Electric pump according to any of the preceding claims, wherein the cover (8) is made of plastic, preferably polypropylene, and/or of the same material as the enclosure (4).
- Electric pump according to any of the preceding claims, further comprising a thermal protector (17) connected with the coil (6a), said thermal protector (17) being disposed inside the leak-tight chamber (9) and therefore being in contact with the thermally conductive material.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES201530032U ES1135742Y (en) | 2015-01-14 | 2015-01-14 | Electric bomb |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3045735A1 true EP3045735A1 (en) | 2016-07-20 |
EP3045735B1 EP3045735B1 (en) | 2021-03-17 |
Family
ID=52396882
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16151193.6A Active EP3045735B1 (en) | 2015-01-14 | 2016-01-14 | Electric pump |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3045735B1 (en) |
CN (2) | CN114151357A (en) |
ES (2) | ES1135742Y (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10837137B2 (en) * | 2016-07-19 | 2020-11-17 | Qingdao Haier Washing Machine Co., Ltd. | Drain pump and washing machine using the same |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT201700038666A1 (en) * | 2017-04-07 | 2018-10-07 | Spal Automotive Srl | ELECTRIC PUMP. |
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- 2016-01-11 CN CN201610015163.6A patent/CN105782064A/en active Pending
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Also Published As
Publication number | Publication date |
---|---|
CN114151357A (en) | 2022-03-08 |
ES2870801T3 (en) | 2021-10-27 |
ES1135742Y (en) | 2015-04-27 |
CN105782064A (en) | 2016-07-20 |
EP3045735B1 (en) | 2021-03-17 |
ES1135742U (en) | 2015-02-03 |
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