EP2853748A1 - Vacuum pump - Google Patents
Vacuum pump Download PDFInfo
- Publication number
- EP2853748A1 EP2853748A1 EP13793663.9A EP13793663A EP2853748A1 EP 2853748 A1 EP2853748 A1 EP 2853748A1 EP 13793663 A EP13793663 A EP 13793663A EP 2853748 A1 EP2853748 A1 EP 2853748A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- motor
- cooling passage
- pump
- exhaust port
- housing
- 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.)
- Withdrawn
Links
- 238000001816 cooling Methods 0.000 claims abstract description 52
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 230000003584 silencer Effects 0.000 claims description 11
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 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
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
- F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
- F04C18/3441—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
- F04C29/045—Heating; Cooling; Heat insulation of the electric motor in hermetic pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
- F04C29/047—Cooling of electronic devices installed inside the pump housing, e.g. inverters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2220/00—Application
- F04C2220/10—Vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
- F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
Definitions
- the present invention relates to a vacuum pump and more specifically to a vacuum pump including a pump means for compressing gas inhaled from an intake port and discharging the compressed gas from an exhaust port and a motor for driving the pump means.
- a vacuum pump including a pump means for compressing gas inhaled from an intake port and discharging the compressed gas from an exhaust port and a motor for driving the pump means has been known as such a vacuum pump (refer to Patent Literature 1).
- the motor drives the pump means, thereby inhaling gas from the intake port and supply the negative pressure to the booster while discharging the inhaled gas from the exhaust port.
- Patent Literature 1 Japanese Patent Laid-Open No. 4-187891
- the vacuum pump used for the brake is attached into an engine room of an automobile, so that the vacuum pump is exposed to a high temperature environment with temperature in the engine room and temperature generated by the motor itself.
- the conventional vacuum pump has a problem in that it is needed to use a motor operable even in a high temperature environment, as a vacuum pump.
- the present invention provides a vacuum pump capable of maintaining not only the performance of a motor but also the suction performance of the pump means by cooling the motor.
- a vacuum pump includes a pump means for compressing gas inhaled from an intake port and discharging the compressed gas from an exhaust port and a motor for driving the pump means, in which a housing for housing a motor casing of the motor is provided to form a cooling passage between the outer surface of the motor casing and the inner surface of the housing and the gas discharged from the exhaust port of the pump means is circulated into the cooling passage to cool the motor.
- the gas discharged from the exhaust port is caused to circulate through a cooling passage formed between a motor casing and a housing of the motor to cool the motor, which enables maintaining not only the performance of the motor but also the suction performance of the pump means.
- Figure 1 shows a vacuum pump 1 for supplying a negative pressure to a brake booster provided in an engine room of an automobile.
- the vacuum pump 1 includes a pump means 2 for compressing inhaled gas and discharging the compressed gas, a motor 3 for driving the pump means 2, and a housing 4 for holding the motor 3.
- a pump means 2 for compressing inhaled gas and discharging the compressed gas
- a motor 3 for driving the pump means 2
- a housing 4 for holding the motor 3.
- the pump means 2 a so-called vane pump is used
- the motor 3 a brushless motor is used.
- the pump means 2 includes: a pump casing 11, on the upper surface of which a substantially circular pump chamber 11a is formed and to the lower surface of which the motor 3 is fixed; a cover 12 which is provided on the upper surface of the pump casing 11 and closes the pump chamber 11a; a rotor 13 which rotates inside the pump chamber 11a by the motor 3; a plurality of vanes 14 sectioning the pump chamber 11a into a plurality of spaces according to the rotation of the rotor 13; and a silencer 15 for covering the upper surface of the cover 12.
- the pump casing 11 is formed of a substantially rectangular parallelepiped member.
- An intake port 11b for sucking gas is formed in the pump chamber 11a formed on the upper surface of the pump casing 11, and an exhaust port 12a for discharging the compressed gas is formed on the cover 12 for closing the pump chamber 11a.
- the intake port 11b communicates with an inhalation port 16 provided on the side face of the pump casing 11 and connected with a booster via a pipe (not shown).
- the exhaust port 12a is formed by drilling the cover 12 and configured to exhaust the compressed gas upward from the top portion of the pump casing 11 and the cover 12. As shown in Figure 2 , the exhaust port 12a is formed on the substantially opposite side of the intake port 11b with the rotor 13 being therebetween.
- the center of the rotor 13 is provided at a position eccentric to the center of the pump chamber 11a. As shown in Figure 1 , the rotor 13 is connected with a drive shaft 21 of the motor 3 via a connection member and configured to rotate counterclockwise, as shown in Figure 2 .
- slits 13a are formed in the rotor 13 at equally spaced intervals and at an angle tilted to a diameter direction thereof and the vanes 14 are retractably provided in the respective slits 13a.
- the leading edge of the vane 14 keeps in contact with the inner peripheral surface of the pump chamber 11a while the vane 14 projects from and retracts into the slit 13a, thereby to section the pump chamber 11a into a plurality of spaces.
- the silencer 15 is a box-shaped member which is bottomed and whose lower end portion is opened.
- the silencer 15 is equipped with a flange 15a around the opening.
- the flange 15a is in close contact with a seal member provided on the upper surface of the cover 12 of the pump casing 11 so that the silencer 15 defines a damper space Sd sectioned off from the outside between it and the cover 12.
- bolt holes 11c are drilled at four corners of the pump casing 11. Bolts are inserted into bolt holes which are formed by drilling at the same position of the cover 12 and the silencer 15 so as to penetrate the bolt holes, thereby to fix the silencer 15 to the pump casing 11 along with the cover 12.
- the upper end of the through hole 17 is opened to the damper space Sd defined by the silencer 15.
- the exhaust port 12a and the through hole 17 formed in the cover 12 are communicated with each other via the damper space Sd and the gas exhausted from the exhaust port 12a passes through the damper space Sd and the through hole 17 and is discharged from the lower surface side of the pump casing 11.
- the motor 3 is a so-called 4-pole and 6-slot brushless motor and includes the drive shaft 21 connected to the rotor 13 of the pump means 2, a cylindrical stator core 22 serving as a motor casing, six pairs of coils 23 provided inside the stator cores 22 and arranged so as to surround the drive shaft 21, and a board 24 which is provided outside the stator cores 22 and controls the coils 23.
- the housing 4 forms a part of the motor 3 and includes a first member 25 which is in close contact with the pump casing 11 to pivotally support the front end side of the drive shaft 21, a second member 26 which is provided at the lower portion of the first member 25 to hold the stator core 22, a third member 27 which is provided at the lower portion of the second member 26 to pivotally support the back end side of the drive shaft 21, and a fourth member 28 which is provided at the lower surface of the third member 27 to house the board 24.
- the combination of the first to third members 25 to 27 forms a space therebetween.
- the fourth member 28 is a box-shaped member which is bottomed and whose upper surface is opened, and a space is formed between the fourth member 28 and the third member 27.
- Bolt holes are formed at four corners of the first to fourth members 25 to 28 at the same position as the bolt holes 11c formed in the pump casing 11.
- the first to fourth members 25 to 28 are fixed to the lower surface of the pump means 2 by bolts along with the motor 3.
- the drive shaft 21 is formed of a small diameter portion 21a protruding upward and downward and a large diameter portion 21b formed adjacent to the position of the coil 23 shown in Figure 1 .
- a bearing 29 for pivotally supporting the small diameter portion 21a is provided on the first and third members 25 and 27 of the housing 4.
- Four permanent magnets 30 arranged to make their magnetic poles different from one another are fixed to the outer peripheral surfaces of the large diameter portion 21b.
- the stator core 22 is cylindrical and held between the first member 25 and the third members 27 of the housing 4 at the upper and lower ends thereof as shown in Figure 1 .
- the inside of the stator core 22, i.e., the space where the drive shaft 21 is provided, is sectioned off from the outside.
- protrusions 22a serving as a stator inside the stator core 22 and a slight space is formed between the outer peripheral surface of the drive shaft 21 and the inner peripheral surface of the protrusions 22a.
- the coils 23 are wound around the respective protrusions 22a.
- the coils 23 are connected to the board 24 by wires (not shown).
- the coils 23 generate a magnetic field by the control of the board 24.
- the center of the stator core 22 slightly deviates from the housing 4 to the left shown in the Figures. Only the outer peripheral surface on the right side in the figure of the stator core 22 is exposed inside the housing 4, but the other portions are in close contact with the second member 26 to be held so that the stator core 22 does not move.
- the space formed between the outer surface of the stator core 22 and the inner surface of the housing 4 forms a first cooling passage Sc1, which constitutes a cooling passage Sc.
- the first cooling passage Sc1 communicates with the through hole 17 formed in the pump casing 11 of the pump means 2 as shown in Figures 1 and 3 .
- a communication port 31 shown in a broken line is formed in the bottom surface of the second member 26 and the third member 27 of the housing 4 and communicates with a second cooling passage Sc2, which constitutes the cooling passage Sc and formed by the third member 27 and the fourth members 28.
- the communication port 31 is formed at the lower side shown in the figure while there is a communication position of the through hole 17 shown on the upper side in the figure. Since the communication port 31 is provided on the side substantially opposite to the through hole 17 in the first cooling passage Sc1, the gas circulating inside the first cooling passage Sc1 circulates along the outer surface of the stator core 22.
- an exhaust port 28a is provided at the side face of the fourth member 28 and exhausts the gas circulating through the second cooling passage Sc2 from the exhaust port 28a.
- the diameter of the exhaust port 12a formed in the pump means 2 is smaller than other diameters, or those of the through hole 17, the communication port 31, and the exhaust port 28a formed in the housing 4.
- the rotor 13 connected to the drive shaft 21 rotates counterclockwise in the pump chamber 11a formed in the pump casing 11 as shown in Figure 1 to move the vane 14 with the pump chamber 11a sectioned to a plurality of spaces.
- the gas exhausted from the exhaust port 28a flows into the damper space Sd defined by the silencer 15 to decrease noise generated by the vacuum pump 1.
- the gas circulated through the damper space Sd circulates through the through hole 17 formed by the pump casing 11 and the cover 17, thereafter, flows into the first cooling passage Sc1 of the cooling passage Sc formed in the housing 4.
- the coil 23 of the motor 3 generates heat with current always applied.
- the transfer of heat increases the temperature of the stator core 22 around which the coil 23 is wound and on which the protrusion 22a is formed.
- the gas flowing into the first cooling passage Sc1 from the through hole 17 circulates toward the communication port 31 formed in the third member 27 and, at this point, the gas circulates along the surface of the stator core 22, so that the coil 23 held by the stator core 22 and the inside of stator core 22 is cooled.
- the gas circulated through the first cooling passage Sc1 is exhausted to the second cooling passage Sc2 through the communication port 31. Also at this point, since the exhaust port 12a is smaller in diameter than the communication port 31, an exhaust resistance occurring when the gas in the first cooling passage Sc1 flows into the communication port 31 is smaller than the exhaust resistance at the exhaust port 12a.
- the board 24 is arranged in front of the communication port 31, so that the gas flowing through the communication port 31 is injected onto the board 24 to effectively cool the board 24.
- the gas is discharged from the exhaust port 28a which is formed in the fourth member 28 and in a position remote from the communication port 31.
- the exhaust port 12a is smaller in diameter than the exhaust port 28a, an exhaust resistance occurring when the gas in the first cooling passage Sc1 is discharged from the exhaust port 28a is smaller than the exhaust resistance at the exhaust port 12a.
- the circulation of the gas discharged from the exhaust port 12a of the pump means 2 through the cooling passage Sc formed between the outer surface of the stator core 22 of the motor and the inner surface of the housing 5 allows the gas to cool the motor 3.
- the motor 3 uses a brushless motor 3 which is equipped with the coil 23 generating heat at a position close to the inner peripheral surface of the stator core 22, which allows the heat-generating coil 23 to be effectively cooled.
- the gas does not flow into the space on the side of the drive shaft 21 in the stator core 22 to preclude a foreign matter from entering a rotation portion of the drive shaft 21 inside the stator core 22, preventing the motor 22 from malfunctioning due to the foreign matter.
- the board 24 is required for the brushless motor 3.
- the board 24 is also provided in the cooling passage Sc and cooled by the gas, which enables resolving the problem of heat resistance of the board 24 that is a drawback of the brushless motor 3.
- the cooling passage Sc includes the first cooling passage Sc1 for cooling the stator core 22 and the second cooling passage Sc2 for cooling the board 24 to allow the board 24 to be separately cooled in the second cooling passage Sc2.
- Providing the silencer 15 forming the damper space Sd in the pump means 2 allows reducing noise accompanied by the exhaust of the gas.
- Forming the through hole 17 in the pump casing 11 enables gas to be supplied to the cooling passage Sc without a new piping being provided outside.
- the shape of the housing 5 can be modified to form the cooling passage surrounding the whole circumference of the stator core 22.
- a groove may be formed in communication with the cooling passage Sc in the circumferential direction in a portion where the second member 26 is in contact with the stator core 22 to allow the gas to be circulated into the groove as the cooling passage Sc.
- the fourth member 28 constituting the housing 4 may be provided between the first member 25 and the pump casing 11 and the board 24 may be housed inside the fourth member 28 as is the case with the above embodiment.
- the gas flows into the second cooling passage Sc2 formed in the fourth member 28, and then the gas flows into the first cooling passage Sc1 via the communication port 31 formed between the first member 25 and the fourth member 28, for example, to allow the stator core 22 to be cooled.
- the communication port 31 may be eliminated and an exhaust port may be formed in the second member 26 to allow only the stator core 22 to be cooled but the board 24 not to be cooled.
- the motor 3 in the embodiment may be a so-called brushless motor, since the brushless motor as the motor 3 can also be cooled entirely by cooling the motor casing exposed inside the housing.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
- The present invention relates to a vacuum pump and more specifically to a vacuum pump including a pump means for compressing gas inhaled from an intake port and discharging the compressed gas from an exhaust port and a motor for driving the pump means.
- Up to now, a vacuum pump has been used for supplying a negative pressure to a brake booster for an automobile, for example. A vacuum pump including a pump means for compressing gas inhaled from an intake port and discharging the compressed gas from an exhaust port and a motor for driving the pump means has been known as such a vacuum pump (refer to Patent Literature 1).
- In the vacuum pump, the motor drives the pump means, thereby inhaling gas from the intake port and supply the negative pressure to the booster while discharging the inhaled gas from the exhaust port.
- Patent Literature 1: Japanese Patent Laid-Open No.
4-187891 - The vacuum pump used for the brake is attached into an engine room of an automobile, so that the vacuum pump is exposed to a high temperature environment with temperature in the engine room and temperature generated by the motor itself.
- Change in a motor characteristic due to increase in temperature also changes a suction performance of the pump means, which become not able to supply a stable negative pressure any longer and affects durability.
- For this reason, the conventional vacuum pump has a problem in that it is needed to use a motor operable even in a high temperature environment, as a vacuum pump.
- In view of such a problem, the present invention provides a vacuum pump capable of maintaining not only the performance of a motor but also the suction performance of the pump means by cooling the motor.
- A vacuum pump according to claim 1 of the present invention includes a pump means for compressing gas inhaled from an intake port and discharging the compressed gas from an exhaust port and a motor for driving the pump means, in which a housing for housing a motor casing of the motor is provided to form a cooling passage between the outer surface of the motor casing and the inner surface of the housing and the gas discharged from the exhaust port of the pump means is circulated into the cooling passage to cool the motor.
- According to the present invention, the gas discharged from the exhaust port is caused to circulate through a cooling passage formed between a motor casing and a housing of the motor to cool the motor, which enables maintaining not only the performance of the motor but also the suction performance of the pump means.
-
- [
Figure 1] Figure 1 is a cross section of a vacuum pump according to the present embodiment. - [
Figure 2] Figure 2 is a cross section along the line II - II inFigure 1 . - [
Figure 3] Figure 3 is a cross section along the line III - III inFigure 1 . - The embodiment shown in the figure is described below.
Figure 1 shows a vacuum pump 1 for supplying a negative pressure to a brake booster provided in an engine room of an automobile. - The vacuum pump 1 includes a pump means 2 for compressing inhaled gas and discharging the compressed gas, a
motor 3 for driving the pump means 2, and ahousing 4 for holding themotor 3. As the pump means 2, a so-called vane pump is used, and as themotor 3, a brushless motor is used. - As shown in
Figure 2 , the pump means 2 includes: apump casing 11, on the upper surface of which a substantiallycircular pump chamber 11a is formed and to the lower surface of which themotor 3 is fixed; acover 12 which is provided on the upper surface of thepump casing 11 and closes thepump chamber 11a; arotor 13 which rotates inside thepump chamber 11a by themotor 3; a plurality ofvanes 14 sectioning thepump chamber 11a into a plurality of spaces according to the rotation of therotor 13; and asilencer 15 for covering the upper surface of thecover 12. - The
pump casing 11 is formed of a substantially rectangular parallelepiped member. Anintake port 11b for sucking gas is formed in thepump chamber 11a formed on the upper surface of thepump casing 11, and anexhaust port 12a for discharging the compressed gas is formed on thecover 12 for closing thepump chamber 11a. - As shown in
Figure 2 , theintake port 11b communicates with aninhalation port 16 provided on the side face of thepump casing 11 and connected with a booster via a pipe (not shown). - As shown in
Figure 1 , theexhaust port 12a is formed by drilling thecover 12 and configured to exhaust the compressed gas upward from the top portion of thepump casing 11 and thecover 12. As shown inFigure 2 , theexhaust port 12a is formed on the substantially opposite side of theintake port 11b with therotor 13 being therebetween. - The center of the
rotor 13 is provided at a position eccentric to the center of thepump chamber 11a. As shown inFigure 1 , therotor 13 is connected with adrive shaft 21 of themotor 3 via a connection member and configured to rotate counterclockwise, as shown inFigure 2 . - Four
slits 13a are formed in therotor 13 at equally spaced intervals and at an angle tilted to a diameter direction thereof and thevanes 14 are retractably provided in therespective slits 13a. - The leading edge of the
vane 14 keeps in contact with the inner peripheral surface of thepump chamber 11a while thevane 14 projects from and retracts into theslit 13a, thereby to section thepump chamber 11a into a plurality of spaces. - The
silencer 15 is a box-shaped member which is bottomed and whose lower end portion is opened. Thesilencer 15 is equipped with aflange 15a around the opening. Theflange 15a is in close contact with a seal member provided on the upper surface of thecover 12 of thepump casing 11 so that thesilencer 15 defines a damper space Sd sectioned off from the outside between it and thecover 12. - As shown in
Figure 2 ,bolt holes 11c are drilled at four corners of thepump casing 11. Bolts are inserted into bolt holes which are formed by drilling at the same position of thecover 12 and thesilencer 15 so as to penetrate the bolt holes, thereby to fix thesilencer 15 to thepump casing 11 along with thecover 12. - In the
pump casing 11 and thecover 12 is formed a throughhole 17 penetrating through from the upper surface to the lower surface thereof. The upper end of the throughhole 17 is opened to the damper space Sd defined by thesilencer 15. - Thus, the
exhaust port 12a and the throughhole 17 formed in thecover 12 are communicated with each other via the damper space Sd and the gas exhausted from theexhaust port 12a passes through the damper space Sd and the throughhole 17 and is discharged from the lower surface side of thepump casing 11. - The
motor 3 is a so-called 4-pole and 6-slot brushless motor and includes thedrive shaft 21 connected to therotor 13 of the pump means 2, acylindrical stator core 22 serving as a motor casing, six pairs ofcoils 23 provided inside thestator cores 22 and arranged so as to surround thedrive shaft 21, and aboard 24 which is provided outside thestator cores 22 and controls thecoils 23. - In the present embodiment, the
housing 4 forms a part of themotor 3 and includes afirst member 25 which is in close contact with thepump casing 11 to pivotally support the front end side of thedrive shaft 21, asecond member 26 which is provided at the lower portion of thefirst member 25 to hold thestator core 22, athird member 27 which is provided at the lower portion of thesecond member 26 to pivotally support the back end side of thedrive shaft 21, and afourth member 28 which is provided at the lower surface of thethird member 27 to house theboard 24. - The combination of the first to
third members 25 to 27 forms a space therebetween. Thefourth member 28 is a box-shaped member which is bottomed and whose upper surface is opened, and a space is formed between thefourth member 28 and thethird member 27. - Bolt holes are formed at four corners of the first to
fourth members 25 to 28 at the same position as thebolt holes 11c formed in thepump casing 11. The first tofourth members 25 to 28 are fixed to the lower surface of the pump means 2 by bolts along with themotor 3. - The
drive shaft 21 is formed of asmall diameter portion 21a protruding upward and downward and alarge diameter portion 21b formed adjacent to the position of thecoil 23 shown inFigure 1 . Abearing 29 for pivotally supporting thesmall diameter portion 21a is provided on the first andthird members housing 4. Fourpermanent magnets 30 arranged to make their magnetic poles different from one another are fixed to the outer peripheral surfaces of thelarge diameter portion 21b. - The
stator core 22 is cylindrical and held between thefirst member 25 and thethird members 27 of thehousing 4 at the upper and lower ends thereof as shown inFigure 1 . Thus, the inside of thestator core 22, i.e., the space where thedrive shaft 21 is provided, is sectioned off from the outside. - There are provided six
protrusions 22a serving as a stator inside thestator core 22 and a slight space is formed between the outer peripheral surface of thedrive shaft 21 and the inner peripheral surface of theprotrusions 22a. - The
coils 23 are wound around therespective protrusions 22a. Thecoils 23 are connected to theboard 24 by wires (not shown). Thecoils 23 generate a magnetic field by the control of theboard 24. - In the present embodiment, as shown in
Figures 1 and3 , the center of thestator core 22 slightly deviates from thehousing 4 to the left shown in the Figures. Only the outer peripheral surface on the right side in the figure of thestator core 22 is exposed inside thehousing 4, but the other portions are in close contact with thesecond member 26 to be held so that thestator core 22 does not move. - The space formed between the outer surface of the
stator core 22 and the inner surface of thehousing 4 forms a first cooling passage Sc1, which constitutes a cooling passage Sc. The first cooling passage Sc1 communicates with the throughhole 17 formed in thepump casing 11 of the pump means 2 as shown inFigures 1 and3 . - A
communication port 31 shown in a broken line is formed in the bottom surface of thesecond member 26 and thethird member 27 of thehousing 4 and communicates with a second cooling passage Sc2, which constitutes the cooling passage Sc and formed by thethird member 27 and thefourth members 28. - The
communication port 31 is formed at the lower side shown in the figure while there is a communication position of the throughhole 17 shown on the upper side in the figure. Since thecommunication port 31 is provided on the side substantially opposite to the throughhole 17 in the first cooling passage Sc1, the gas circulating inside the first cooling passage Sc1 circulates along the outer surface of thestator core 22. - As shown in
Figure 1 , anexhaust port 28a is provided at the side face of thefourth member 28 and exhausts the gas circulating through the second cooling passage Sc2 from theexhaust port 28a. - In the vacuum pump 1 according to the present embodiment, the diameter of the
exhaust port 12a formed in the pump means 2 is smaller than other diameters, or those of the throughhole 17, thecommunication port 31, and theexhaust port 28a formed in thehousing 4. - The operation of the thus configured vacuum pump 1 is described below. Applying current to the
coil 23 via theboard 24 forming themotor 3 generates a magnetic field in thecoil 23 to make thepermanent magnet 30 provided on thedrive shaft 21 to approach or separate from the coil, thereby rotating thedrive shaft 21. - In the pump means 2, the
rotor 13 connected to thedrive shaft 21 rotates counterclockwise in thepump chamber 11a formed in thepump casing 11 as shown inFigure 1 to move thevane 14 with thepump chamber 11a sectioned to a plurality of spaces. - When the space sectioned by the
vane 14 passes theintake port 11b formed in thepump chamber 11a while therotor 13 rotates, the space gradually then increases in volume according to the rotation of therotor 13, so that gas is taken in via theintake port 11b and a negative pressure is provided to the booster through theinhalation port 16. - Thereafter, since the space sectioned by the
vane 14 further decreases in volume toward theexhaust port 12a, when the space is brought into communication with theexhaust port 12a the compressed gas is exhausted from theexhaust port 28a. - The gas exhausted from the
exhaust port 28a flows into the damper space Sd defined by thesilencer 15 to decrease noise generated by the vacuum pump 1. - The gas circulated through the damper space Sd circulates through the through
hole 17 formed by thepump casing 11 and thecover 17, thereafter, flows into the first cooling passage Sc1 of the cooling passage Sc formed in thehousing 4. - At this point, since the
exhaust port 12a is smaller in diameter than the throughhole 17, an exhaust resistance occurring when the gas in the damper space Sd flows into the throughhole 17 is smaller than the exhaust resistance at theexhaust port 12a, so that the intake performance of the pump means 2 is prevented from being decreased. - The
coil 23 of themotor 3 generates heat with current always applied. The transfer of heat increases the temperature of thestator core 22 around which thecoil 23 is wound and on which theprotrusion 22a is formed. - The gas flowing into the first cooling passage Sc1 from the through
hole 17 circulates toward thecommunication port 31 formed in thethird member 27 and, at this point, the gas circulates along the surface of thestator core 22, so that thecoil 23 held by thestator core 22 and the inside ofstator core 22 is cooled. - The gas circulated through the first cooling passage Sc1 is exhausted to the second cooling passage Sc2 through the
communication port 31. Also at this point, since theexhaust port 12a is smaller in diameter than thecommunication port 31, an exhaust resistance occurring when the gas in the first cooling passage Sc1 flows into thecommunication port 31 is smaller than the exhaust resistance at theexhaust port 12a. - In the second cooling passage Sc2, the
board 24 is arranged in front of thecommunication port 31, so that the gas flowing through thecommunication port 31 is injected onto theboard 24 to effectively cool theboard 24. - After that, the gas is discharged from the
exhaust port 28a which is formed in thefourth member 28 and in a position remote from thecommunication port 31. At this point also, since theexhaust port 12a is smaller in diameter than theexhaust port 28a, an exhaust resistance occurring when the gas in the first cooling passage Sc1 is discharged from theexhaust port 28a is smaller than the exhaust resistance at theexhaust port 12a. - According to the vacuum pump 1 of the present embodiment, the circulation of the gas discharged from the
exhaust port 12a of the pump means 2 through the cooling passage Sc formed between the outer surface of thestator core 22 of the motor and the inner surface of thehousing 5 allows the gas to cool themotor 3. - This allows the vacuum pump 1 to be operated without losing stability even if the
motor 3 lower in heat resistance than a conventional one is used and to be obtained at an inexpensive cost. - In the present embodiment, the
motor 3 uses abrushless motor 3 which is equipped with thecoil 23 generating heat at a position close to the inner peripheral surface of thestator core 22, which allows the heat-generatingcoil 23 to be effectively cooled. - At this point, the gas does not flow into the space on the side of the
drive shaft 21 in thestator core 22 to preclude a foreign matter from entering a rotation portion of thedrive shaft 21 inside thestator core 22, preventing themotor 22 from malfunctioning due to the foreign matter. - The
board 24 is required for thebrushless motor 3. Theboard 24 is also provided in the cooling passage Sc and cooled by the gas, which enables resolving the problem of heat resistance of theboard 24 that is a drawback of thebrushless motor 3. - In the present embodiment, the cooling passage Sc includes the first cooling passage Sc1 for cooling the
stator core 22 and the second cooling passage Sc2 for cooling theboard 24 to allow theboard 24 to be separately cooled in the second cooling passage Sc2. - Providing the
silencer 15 forming the damper space Sd in the pump means 2 allows reducing noise accompanied by the exhaust of the gas. Forming the throughhole 17 in thepump casing 11 enables gas to be supplied to the cooling passage Sc without a new piping being provided outside. - At this point, since the
exhaust port 28a is smaller in diameter than the throughhole 17, an exhaust resistance occurring when the gas flows into the throughhole 17 is smaller than the exhaust resistance occurring when the gas is exhausted from theexhaust port 28a, so that the efficiency of the pump means 2 is not decreased due to the circulation of the gas in the throughhole 17. - In the above embodiment, as shown in
Figure 3 , although only a portion of thestator core 22 is exposed to the cooling passage Sc, the shape of thehousing 5 can be modified to form the cooling passage surrounding the whole circumference of thestator core 22. - In
Figure 1 of the above embodiment, a groove may be formed in communication with the cooling passage Sc in the circumferential direction in a portion where thesecond member 26 is in contact with thestator core 22 to allow the gas to be circulated into the groove as the cooling passage Sc. - Furthermore, the
fourth member 28 constituting thehousing 4 may be provided between thefirst member 25 and thepump casing 11 and theboard 24 may be housed inside thefourth member 28 as is the case with the above embodiment. - In this case, the gas flows into the second cooling passage Sc2 formed in the
fourth member 28, and then the gas flows into the first cooling passage Sc1 via thecommunication port 31 formed between thefirst member 25 and thefourth member 28, for example, to allow thestator core 22 to be cooled. - In the above embodiment, although the gas is caused to flow into the
fourth member 28 of thehousing 5 to cool the board, thecommunication port 31 may be eliminated and an exhaust port may be formed in thesecond member 26 to allow only thestator core 22 to be cooled but theboard 24 not to be cooled. - The
motor 3 in the embodiment may be a so-called brushless motor, since the brushless motor as themotor 3 can also be cooled entirely by cooling the motor casing exposed inside the housing. -
1 Vacuum pump 2 Pump means 3 Motor 4 Housing 11 Pump casing 11a Pump chamber 11b Intake port 12 Cover 12a Exhaust port 15 Silencer 21 Drive shaft 22 Stator core (motor casing) Sd Damper space Sc Cooling passage Sc1 First cooling passage Sc2 Second cooling passage
Claims (4)
- A vacuum pump comprising a pump means for compressing gas inhaled from an intake port and discharging the compressed gas from an exhaust port and a motor for driving the pump means,
wherein a housing for housing a motor casing of the motor is provided to form a cooling passage between the outer surface of the motor casing and the inner surface of the housing, and the gas discharged from the exhaust port of the pump means is circulated into the cooling passage to cool the motor. - The vacuum pump according to claim 1, wherein the motor is a brushless motor and includes a drive shaft which has a permanent magnet and is connected to the pump means, a plurality of pairs of coils provided inside a stator core serving as the motor casing in such a way as to surround the drive shaft, and a board which is provided outside the stator core and controls the coil, and
the board is arranged inside the cooling passage. - The vacuum pump according to claim 2, wherein the cooling passage includes a first cooling passage formed between the inner surface of the housing and the outer surface of the stator core, a second cooling passage which is sectioned from the first cooling passage and houses the board, and a communication port for causing the first cooling passage to communicate with the second cooling passage, and
the exhaust port of the pump means is made smaller in diameter than the communication port. - The vacuum pump according to any of claims 1 to 3, wherein the pump means includes: a pump casing, at one end face of which a substantially circular pump chamber is formed and to the other end face of which the motor is fixed; a cover which is formed at the one end face of the pump casing and closes the pump chamber and in which the exhaust port is formed; a rotor which is rotated by the motor inside the pump chamber; and a vane for sectioning the pump chamber into a plurality of spaces while the rotor is rotated, and
wherein a through hole penetrating through from the one end face to the other end face of the pump casing is formed therein such that the through hole is caused to communicate with the cooling passage formed in the housing and
a silencer in which a damper space for causing the exhaust port to communicate with the through hole is formed is provided on the one end face of the pump casing,
whereby the air discharged from the exhaust port is circulated into the cooling passage via the damper space and the through hole.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012116489A JP2013241907A (en) | 2012-05-22 | 2012-05-22 | Vacuum pump |
PCT/JP2013/063629 WO2013176028A1 (en) | 2012-05-22 | 2013-05-16 | Vacuum pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2853748A1 true EP2853748A1 (en) | 2015-04-01 |
EP2853748A4 EP2853748A4 (en) | 2016-06-15 |
Family
ID=49623722
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13793663.9A Withdrawn EP2853748A4 (en) | 2012-05-22 | 2013-05-16 | Vacuum pump |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2853748A4 (en) |
JP (1) | JP2013241907A (en) |
WO (1) | WO2013176028A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017220141A1 (en) * | 2016-06-22 | 2017-12-28 | Pierburg Pump Technology Gmbh | Motor vehicle vacuum pump arrangement |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6236338B2 (en) * | 2014-03-18 | 2017-11-22 | 大豊工業株式会社 | Fluid machinery |
DE102014207023B3 (en) * | 2014-04-11 | 2015-07-30 | Magna Powertrain Hückeswagen GmbH | Automotive vacuum pump with gluing |
KR101706113B1 (en) * | 2014-12-26 | 2017-02-14 | 영신정공 주식회사 | ELECTRO VACUUM PUMP to reduce the Noise |
JP2017040182A (en) * | 2015-08-18 | 2017-02-23 | 大豊工業株式会社 | Motor pump |
JP2017040181A (en) * | 2015-08-18 | 2017-02-23 | 大豊工業株式会社 | Motor pump |
KR101852384B1 (en) * | 2018-02-07 | 2018-06-04 | 서중 | Cooling plate use dry type vacuum pump |
JP7161918B2 (en) * | 2018-11-06 | 2022-10-27 | 株式会社ミクニ | vacuum pump |
JP2021076078A (en) * | 2019-11-11 | 2021-05-20 | 株式会社ミクニ | pump |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6293496A (en) * | 1985-10-18 | 1987-04-28 | Hitachi Ltd | Rotary vane type pump |
JP2639136B2 (en) * | 1989-11-02 | 1997-08-06 | 松下電器産業株式会社 | Scroll compressor |
JPH04187891A (en) | 1990-11-20 | 1992-07-06 | Fuji Electric Co Ltd | Silencer for vane pump |
JP2004156446A (en) * | 2002-11-01 | 2004-06-03 | Tokico Ltd | Scroll fluid-machinery |
JP4519490B2 (en) * | 2004-03-18 | 2010-08-04 | 日立アプライアンス株式会社 | Scroll compressor |
US7285882B2 (en) * | 2005-05-12 | 2007-10-23 | Sullair Corporation | Integrated electric motor driven compressor |
JP2007023958A (en) * | 2005-07-20 | 2007-02-01 | Matsushita Electric Ind Co Ltd | Vane rotary type air pump |
JP4629546B2 (en) * | 2005-09-30 | 2011-02-09 | アネスト岩田株式会社 | Scroll fluid machinery |
EP1967736B1 (en) * | 2005-12-28 | 2016-09-14 | Daikin Industries, Ltd. | Compressor |
JP2008101558A (en) * | 2006-10-20 | 2008-05-01 | Hitachi Appliances Inc | Hermetic compressor |
DE102006058843A1 (en) * | 2006-12-13 | 2008-06-19 | Pfeiffer Vacuum Gmbh | vacuum pump |
JP5444880B2 (en) * | 2009-06-25 | 2014-03-19 | ダイキン工業株式会社 | Compressor |
-
2012
- 2012-05-22 JP JP2012116489A patent/JP2013241907A/en active Pending
-
2013
- 2013-05-16 WO PCT/JP2013/063629 patent/WO2013176028A1/en active Application Filing
- 2013-05-16 EP EP13793663.9A patent/EP2853748A4/en not_active Withdrawn
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017220141A1 (en) * | 2016-06-22 | 2017-12-28 | Pierburg Pump Technology Gmbh | Motor vehicle vacuum pump arrangement |
US20190323506A1 (en) * | 2016-06-22 | 2019-10-24 | Pierburg Pump Technology Gmbh | Motor vehicle vacuum pump arrangement |
US10995757B2 (en) | 2016-06-22 | 2021-05-04 | Pierburg Pump Technology Gmbh | Dry-running gas vane pump having a first fluid outlet and a second fluid outlet associated with the pump chamber with the second fluid outlet permanently open to atmosphere without being impeded |
US11261869B2 (en) | 2016-06-22 | 2022-03-01 | Pierburg Pump Technology Gmbh | Motor vehicle vacuum pump arrangement |
Also Published As
Publication number | Publication date |
---|---|
EP2853748A4 (en) | 2016-06-15 |
WO2013176028A1 (en) | 2013-11-28 |
JP2013241907A (en) | 2013-12-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2853748A1 (en) | Vacuum pump | |
JP3904595B1 (en) | Counter-rotating axial fan | |
TWI509953B (en) | Motor of ceiling fan | |
US20170058915A1 (en) | Electric Coolant Pump | |
US20150340930A1 (en) | Ceiling Fan Motor | |
JP2017169338A (en) | Electric power unit | |
JP2008175090A (en) | Motor-driven pump | |
JP2006217748A (en) | Fan motor | |
JP2015025453A (en) | Vacuum pump | |
JP6878255B2 (en) | Centrifugal pump | |
JP2015218591A (en) | Electric supercharger | |
KR102331134B1 (en) | Turbo blower with flow control cooling system | |
JP2005160281A (en) | Radiation device and motor structure therefor | |
CN105337449A (en) | Direct-current permanent-magnet brushless motor | |
EP3319213B1 (en) | Blower | |
JP2019138254A (en) | Pump device | |
KR101520766B1 (en) | Motor Unit, Pump Unit And Electric Oil Pump Using The Sames | |
JP2015113781A (en) | Axial fan and series axial fan | |
US20040076517A1 (en) | Serial ventilation device | |
JP2004274800A (en) | Cooling mechanism of electric motor | |
KR20160097589A (en) | Electric water pump with filter assembly | |
CN109904971B (en) | Motor and air supply device with same | |
CN101714793B (en) | Coil support for rotating electrical machine | |
WO2016157448A1 (en) | Motor-integrated compressor | |
JP2005163757A (en) | Electric blower |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20141205 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
DAX | Request for extension of the european patent (deleted) | ||
RA4 | Supplementary search report drawn up and despatched (corrected) |
Effective date: 20160518 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: F04C 29/04 20060101AFI20160511BHEP Ipc: F04C 25/02 20060101ALI20160511BHEP |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20161214 |