CA1259972A - Fluid compressor with rotational speed detecting device - Google Patents
Fluid compressor with rotational speed detecting deviceInfo
- Publication number
- CA1259972A CA1259972A CA000474881A CA474881A CA1259972A CA 1259972 A CA1259972 A CA 1259972A CA 000474881 A CA000474881 A CA 000474881A CA 474881 A CA474881 A CA 474881A CA 1259972 A CA1259972 A CA 1259972A
- Authority
- CA
- Canada
- Prior art keywords
- compressor
- housing
- rotating member
- drive shaft
- main drive
- 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.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3222—Cooling devices using compression characterised by the compressor driving arrangements, e.g. clutches, transmissions or multiple drives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
- F16D48/064—Control of electrically or electromagnetically actuated clutches
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/488—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by variable reluctance detectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/10—System to be controlled
- F16D2500/102—Actuator
- F16D2500/1021—Electrical type
- F16D2500/1022—Electromagnet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/30—Signal inputs
- F16D2500/306—Signal inputs from the engine
- F16D2500/3067—Speed of the engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/70—Details about the implementation of the control system
- F16D2500/71—Actions
- F16D2500/7107—Others
- F16D2500/7109—Pulsed signal; Generating or processing pulsed signals; PWM, width modulation, frequency or amplitude modulation
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Compressor (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Rotary Pumps (AREA)
Abstract
FLUID COMPRESSOR WITH
ROTATIONAL SPEED DETECTING DEVICE
ABSTRACT
The invention relates to a fluid compressor which includes a mechanism for detecting the number of the rotations of the com-pressing element. Magnetic flux, which leaks from an electromagnetic clutch through a main drive shaft to an asymmetric rotating member, is sensed by a magnetic pickup which is mounted and supported adja-cent the rotation locus of the asymmetric rotating member in the housing.
ROTATIONAL SPEED DETECTING DEVICE
ABSTRACT
The invention relates to a fluid compressor which includes a mechanism for detecting the number of the rotations of the com-pressing element. Magnetic flux, which leaks from an electromagnetic clutch through a main drive shaft to an asymmetric rotating member, is sensed by a magnetic pickup which is mounted and supported adja-cent the rotation locus of the asymmetric rotating member in the housing.
Description
~5~7~
FLUID COMPRESSOR WITH ROTATIONAL
SPEED DETECTING DEVICE
TE CHNICAL FIELD
The invention relates to a compressor for an automotive air conditioner including Q rotational speed detecting device.
BACKGROUND OF THE INVENTION
In an automotive air conditioning compressor, when its rotation is stopped by locking, e.g., of the wraps, the connection between fl driving source flnd the compressor should be quickly turned off. If the compressor, an alternator and other equipment are driven together by a V-shaped belt, it is necessary that the movement of the other equipment is not effected when the compressor is stopped. Because of this need, rot~tional speed detecting devices have been attQched to automotive compressors.
It is generally known that there are various types of rotationQl speed detecting devices for use with compressors; for example mechanical types, generator types, electromagnetic induction types, and so on. These typical rotational speed detecting devices are either placed ahead of the clutch or project behind a compressor, thereby increasing the space required for a compressor. But, since the available space for an automotive air conditioner is limited, it is dif-ficult to attach such a rotational speed detecting device.
Furthermore, ~ new method for detecting rotationfll speed is required in compressors of the type, where a main shaft doesn't pass through the rear of the compressor housing. For example, in a scroll type compressor the main shaft does not extend through the rear of the compressor housing so the the rotational speed of such a '~S'9~2 ..
~ 2 compressor cannot be detected at the rear end of the shaft, which is located inside the housing.
SUMMARY OF THE INVENTION
It is an object of an aspect of the invention to S provide a compressox with a rotational speed detecting device which is attached inside the compressor so that the size of the compressor is not increased.
Various aspects of the invention are as follows:
A fluid compressor co:mprising a housing, a main drive shaft rotatably sup]ported in the housing, an electromagnetic clutch mounted on said compres~or housing ~or selectively coupling said main dr.ive shaft to an external driving source, a compressing element drivingly coupled to said main drive sha~t, an asymmetric rotating member located in said housing and coupled to said main drive shaft ~or rotary motion and for receiving magnetic flux leaking from said electromagnetic clutch through said main shaft drive, and detecting means for detecting the number of rotations of said compressing element, said detecting means comprising a magnetic picXup connected to said housing and having a portion located adjacent to the rotation locus of said asymmetric rotating member to sense the variations of magnetic ~lux as said asymmetric rotating member rotates past said magnetic pickup.
In a fluid compressor wherein a compressing element carried in a compressor housing is driven by the rotary motion of a main drive shaft which is selectively coupled to an external drive source through an electromagnetic clutch and an asymmetric rotating member is located within the housing, is coupled to the main driv~ sha~t and receives magnetic flux leaking from the electromagnetic clutch through the main drive shaft, the improvement comprising detecting means located at least partially within the compressor housing for detecting the number of rotations of said compressing element, said detecting means comprising a magnetic pickup connected to said housing and having a portion located adjacent to the rotation locus of said B
~2~
2a asymmetric rotating member to sense the variations of magnetic flux as said asymmetric rotating member rotates past said magnetic pickup.
Further objects, features and other aspects of this invention will be understood from the following detailed description of the preferred embodiments of this invention referring to the attached drawings.
BRIEF DESCRIPTION OF DRAWINGS
Figure l is a sectional view of a scroll type compressor illustrating an embodiment of the invention.
Figure 2 is a sectionall view of a magnetic pickup used in an embodiment of the invention.
Figure 3 is a view O:e an asymmetrical rotor and magnetic pickup, illustrating the electromagnetic induction operation of the invention.
.~
-i;53~372 Figure 4 is a view illustrating the voltage change caused by the magnetic pickup in Figure 3.
Figure 5 is fl sectional view of a compressor illustrating another embodiment oî the invention.
DETAILED DESCRIPTION OF T~E PREFERRED EMBODIMENTS
Referring to the attached drawings, in Figure 1, there is shown 8 scroll type compressor with a housing 1 cornprised of Q front end plate 11 and Q CUp shaped portion 12. A hole 111 penetrates front end plate 11 and rnain drive shaft 2 extends into hole 111, Q disk rotor 21 i9 fixed to the inner end of main drive shnft 2, and is rotatably supported by a bearing 13 in hole 111.
Front end plate 11 has a sleeve 14 extending from it which surrounds main drive shaft 2. A bearing 15 is placed in the front end of sleeve 14 to rotatably support main drive shaft 2.
A clutch rotor 31 is rotatably supported by a bearing 16, and an electromagnet 32 is fixed on the outer surface of sleeve 14. Arms-ture plate 33 is elastically supported on the end of main drive shaft 2 projecting from sleeve 14. An electromagnetic clutch is thereby com-prised of clutch rotor 31, electromagnet 32 and armature plate 33.
The rotation from an outer driving source tfor example, nn automotive engine) is transmitted to main drive shaft 2 through the electro-magnetic clutch. More specifically, the rotation from the outer driving driving source is transmitted to clutch rotor 31 through a belt; and thereafter, when armature plate 33 is connected to clutch rotor 31 by turning on electricity to electromngnet 32, the rotation is trsnsmitted from clutch rotor 31 to armature plate 33, and therefrom to main drive shsft 2.
The opening of cup sh~ped porl:ion 12 is closed by front end plnte ll. An or~iting scroll 24 is rotatably supported through a be~ring 23 on a driving disk 22 eccentrically connected to the inner end surface of disk rotor 21. A fixed scroll 25 interfits with orbiting scroll 24 and the end pl~te OI fixed scroll 25 is fixed in cup shaped ~..
9~
portion 12. A rotation preventing mechanism, which prevents the rotation of orbiting scroll 2~, is is comprised of a fixed ring 112, an orbiting ring 113 and balls 11~. Fixed ring 112 is fixed to front end plate 11, and orbiting ring 113 is fixed to the end plate of orbiting scroll 24 and faces fixed ring 112. Balls 114 set are placed between both rings ~nd carried within ball receiving holes in each ring.
The fluid which enters at suction port 4 is taken in a closed space which is formed by orbiting scroll 24 and fixed scroll 25, grad-ually compressed, moved to the clenter of the both scrolls by the orbital motion of orbiting scroll 24, discharged from output port 51 to discharge chamber 5, and circulated from discharge port 6.
A half disk sh~ped counterweight 26, which is formed of a magnetic substance, is coupled to the driving mechanism at a location between disk rotor 21 and driving disk 22; more specifically, counterweight 26 is attflched to driving disc 22.
Referring to Figure 2, a structure of a magnetic pickup 7 in accordance with the present invention is shown. Magnetic pickup 7 has a coil 73 carried in a core 72. An iron core 71 is inserted through the center of core 72. Coil 73 is attached to core 72, and core 72 is attached to iron core 71 by an epoxy resin 74. Magnetic pickup 7 is inserted into a penetrating hole through ~ront end plate 11 in the direction of &n arrow shown in ~igure 2. The penetrating hole is pre-formed in front end plate 11. The distal end of iron core 71 is shaped to align substantially flush with the inner surface of front end plate 11 at which it terminates.
Referring to Figure 3, the operation of rotation speed detecting device is explRined as follows:
Whenever electromagnet 32 is turned on by electricity, main drive shaft 2 is magnetized by the leakage of msgnetic nux~ and hslf disk shaped counterweight 26 also is magnetized. Though counterweight 26 moves with the rotation of driving disk 22, the movement of counterweight 26 is the same as rotary motion about the ~Lq~72 center 28 of main shaft 12, since driving clisk 22 is eccentrically coupled to main drive shaft 2 through a drive pin. Driving pin 22 in turn is coupled to orbiting scroll 24 in such a manner that each rotation of driving disc 22/counterweight 26 results in one orbital revo-lution of orbiting scroll 24. The distal end of magnetic pick up 7 is located adjncent to and facing the rotation locus of counterweight 26, i.e., adjacent the outermost area through which counterweight 26 rotates.
The magnetic flux (0) which passes throllgh magnetic pickup 7, since half disk shaped counterweight 26 is magnetized, is at a high level when the A-B-A' portion of half disk shaped counterweight 26 i5 close to magnetic pickup 7, and is at a low level when this portion is not close to magnetic pickup 7~ as Q result, the magnetic flux which passes through magnetic pickup 7 is changed by the rotation of half disk shaped counterweight 26, and the voltage shown in the following formula (1) is generated in magnetic pickup 7 by electromagnetic induction.
d ~
e = - (1) d t When half disk shaped counterweight 26 shown in Figure 3 rotates in the direction of the illustrated arrow, the magnetic flux (0) which passes through magnetic pickup 7 is reduced as point A' passes pick up 7, and a positive voltage is generated in magnetic pickup 7 according to formula (1). Similarly, a negative voltage is generated at pickup 7 as point A passes it. That is, each time half disk shaped counterweight 26 rotates once, one pulse of positive voltage and one pulse OI negative voltage shown in Figure 4 are generated in magnetic pickup 7. Accordingly, if the number of pulses are measured, the number of compressor rotations can be detected. Because of its half-disc shape, counterweight 2~ functions as an asymmetric rotating member to generate the electrical pulses in pickup 7 which are ~%~ 7~2 correlflted to the rotation/orbiting of scroll 24, the compressing element.
Figure 5 shows an embodiment of the Invention wherein a magnetic pickup 7 is incorporated into a swash plate type compressor.
A ca m rotor 8, which is inclined on one end surface is rotated by the rotation of mflin drive shaft 2. A piston 10 reciprocates with ~he sway of a swash plate 9 which is coupled to the inclined plane of cam rotor 8.
A projection 81 radially projects from the outer circumference of cam rotor 5. Projection 81 extends around ~l portion of the cir-cumference Or cam rotor 8, so that it has end points similar to end points A and A' of counterweight 26~ Cflm rotor 8 is thus asymmetric and functions as in asymmetric rotating member so that the magnetic flux sensed by pickup 7 varies in the same manner during rotation of ca m rotor 8 as during rotation of counterweight 26. Magnetic flux at cam rotor 8, of course, results from the leakage of magnetic flux when electromagnet 32 is turned on. The rotation of the compressor drive in this embodiment is thus sensed in a manner similar to that of the first embodiment wherein a magnetic pickup to placed adjacent a rotating asymmetric member within the compressor housing.
As mentioned above, the fluid compressor in accordance with the present invention is equipped with an asymmetric rotating member which is substantially magneti~ed by the electromagnetic clutch, and a magnetic pickup is placed adjacent the rotation locus of the asym-metric rotating member within the compressor housing. The magnetic flux which passes through the magnetic pickup is changed by the sub-stantial varifltion of distance between portions of the asymmetric member and the magnetic pickup. The rotation of compressor's com-pressing element thus can be detected by measuring the voltage which is generated in the magnetic pickup. Thusl a lsrge space for a sensor in the compressor is not required and it is easy to mount on an auto-mobile. The number of rotations OI the compressor can be very ~' precisely detected since the number of output pulses from the magnetic pickup is generated in accordance with the rotation of main shaft.
This invention has been described in detail in connection with the preferred embodiments, but these are examples only and the inven-tion is not restricted thereto. It ~ill be easily understood, by those skilled in the art that other variations and modifications can be easily made within the scope of this invention.
!1~!
FLUID COMPRESSOR WITH ROTATIONAL
SPEED DETECTING DEVICE
TE CHNICAL FIELD
The invention relates to a compressor for an automotive air conditioner including Q rotational speed detecting device.
BACKGROUND OF THE INVENTION
In an automotive air conditioning compressor, when its rotation is stopped by locking, e.g., of the wraps, the connection between fl driving source flnd the compressor should be quickly turned off. If the compressor, an alternator and other equipment are driven together by a V-shaped belt, it is necessary that the movement of the other equipment is not effected when the compressor is stopped. Because of this need, rot~tional speed detecting devices have been attQched to automotive compressors.
It is generally known that there are various types of rotationQl speed detecting devices for use with compressors; for example mechanical types, generator types, electromagnetic induction types, and so on. These typical rotational speed detecting devices are either placed ahead of the clutch or project behind a compressor, thereby increasing the space required for a compressor. But, since the available space for an automotive air conditioner is limited, it is dif-ficult to attach such a rotational speed detecting device.
Furthermore, ~ new method for detecting rotationfll speed is required in compressors of the type, where a main shaft doesn't pass through the rear of the compressor housing. For example, in a scroll type compressor the main shaft does not extend through the rear of the compressor housing so the the rotational speed of such a '~S'9~2 ..
~ 2 compressor cannot be detected at the rear end of the shaft, which is located inside the housing.
SUMMARY OF THE INVENTION
It is an object of an aspect of the invention to S provide a compressox with a rotational speed detecting device which is attached inside the compressor so that the size of the compressor is not increased.
Various aspects of the invention are as follows:
A fluid compressor co:mprising a housing, a main drive shaft rotatably sup]ported in the housing, an electromagnetic clutch mounted on said compres~or housing ~or selectively coupling said main dr.ive shaft to an external driving source, a compressing element drivingly coupled to said main drive sha~t, an asymmetric rotating member located in said housing and coupled to said main drive shaft ~or rotary motion and for receiving magnetic flux leaking from said electromagnetic clutch through said main shaft drive, and detecting means for detecting the number of rotations of said compressing element, said detecting means comprising a magnetic picXup connected to said housing and having a portion located adjacent to the rotation locus of said asymmetric rotating member to sense the variations of magnetic ~lux as said asymmetric rotating member rotates past said magnetic pickup.
In a fluid compressor wherein a compressing element carried in a compressor housing is driven by the rotary motion of a main drive shaft which is selectively coupled to an external drive source through an electromagnetic clutch and an asymmetric rotating member is located within the housing, is coupled to the main driv~ sha~t and receives magnetic flux leaking from the electromagnetic clutch through the main drive shaft, the improvement comprising detecting means located at least partially within the compressor housing for detecting the number of rotations of said compressing element, said detecting means comprising a magnetic pickup connected to said housing and having a portion located adjacent to the rotation locus of said B
~2~
2a asymmetric rotating member to sense the variations of magnetic flux as said asymmetric rotating member rotates past said magnetic pickup.
Further objects, features and other aspects of this invention will be understood from the following detailed description of the preferred embodiments of this invention referring to the attached drawings.
BRIEF DESCRIPTION OF DRAWINGS
Figure l is a sectional view of a scroll type compressor illustrating an embodiment of the invention.
Figure 2 is a sectionall view of a magnetic pickup used in an embodiment of the invention.
Figure 3 is a view O:e an asymmetrical rotor and magnetic pickup, illustrating the electromagnetic induction operation of the invention.
.~
-i;53~372 Figure 4 is a view illustrating the voltage change caused by the magnetic pickup in Figure 3.
Figure 5 is fl sectional view of a compressor illustrating another embodiment oî the invention.
DETAILED DESCRIPTION OF T~E PREFERRED EMBODIMENTS
Referring to the attached drawings, in Figure 1, there is shown 8 scroll type compressor with a housing 1 cornprised of Q front end plate 11 and Q CUp shaped portion 12. A hole 111 penetrates front end plate 11 and rnain drive shaft 2 extends into hole 111, Q disk rotor 21 i9 fixed to the inner end of main drive shnft 2, and is rotatably supported by a bearing 13 in hole 111.
Front end plate 11 has a sleeve 14 extending from it which surrounds main drive shaft 2. A bearing 15 is placed in the front end of sleeve 14 to rotatably support main drive shaft 2.
A clutch rotor 31 is rotatably supported by a bearing 16, and an electromagnet 32 is fixed on the outer surface of sleeve 14. Arms-ture plate 33 is elastically supported on the end of main drive shaft 2 projecting from sleeve 14. An electromagnetic clutch is thereby com-prised of clutch rotor 31, electromagnet 32 and armature plate 33.
The rotation from an outer driving source tfor example, nn automotive engine) is transmitted to main drive shaft 2 through the electro-magnetic clutch. More specifically, the rotation from the outer driving driving source is transmitted to clutch rotor 31 through a belt; and thereafter, when armature plate 33 is connected to clutch rotor 31 by turning on electricity to electromngnet 32, the rotation is trsnsmitted from clutch rotor 31 to armature plate 33, and therefrom to main drive shsft 2.
The opening of cup sh~ped porl:ion 12 is closed by front end plnte ll. An or~iting scroll 24 is rotatably supported through a be~ring 23 on a driving disk 22 eccentrically connected to the inner end surface of disk rotor 21. A fixed scroll 25 interfits with orbiting scroll 24 and the end pl~te OI fixed scroll 25 is fixed in cup shaped ~..
9~
portion 12. A rotation preventing mechanism, which prevents the rotation of orbiting scroll 2~, is is comprised of a fixed ring 112, an orbiting ring 113 and balls 11~. Fixed ring 112 is fixed to front end plate 11, and orbiting ring 113 is fixed to the end plate of orbiting scroll 24 and faces fixed ring 112. Balls 114 set are placed between both rings ~nd carried within ball receiving holes in each ring.
The fluid which enters at suction port 4 is taken in a closed space which is formed by orbiting scroll 24 and fixed scroll 25, grad-ually compressed, moved to the clenter of the both scrolls by the orbital motion of orbiting scroll 24, discharged from output port 51 to discharge chamber 5, and circulated from discharge port 6.
A half disk sh~ped counterweight 26, which is formed of a magnetic substance, is coupled to the driving mechanism at a location between disk rotor 21 and driving disk 22; more specifically, counterweight 26 is attflched to driving disc 22.
Referring to Figure 2, a structure of a magnetic pickup 7 in accordance with the present invention is shown. Magnetic pickup 7 has a coil 73 carried in a core 72. An iron core 71 is inserted through the center of core 72. Coil 73 is attached to core 72, and core 72 is attached to iron core 71 by an epoxy resin 74. Magnetic pickup 7 is inserted into a penetrating hole through ~ront end plate 11 in the direction of &n arrow shown in ~igure 2. The penetrating hole is pre-formed in front end plate 11. The distal end of iron core 71 is shaped to align substantially flush with the inner surface of front end plate 11 at which it terminates.
Referring to Figure 3, the operation of rotation speed detecting device is explRined as follows:
Whenever electromagnet 32 is turned on by electricity, main drive shaft 2 is magnetized by the leakage of msgnetic nux~ and hslf disk shaped counterweight 26 also is magnetized. Though counterweight 26 moves with the rotation of driving disk 22, the movement of counterweight 26 is the same as rotary motion about the ~Lq~72 center 28 of main shaft 12, since driving clisk 22 is eccentrically coupled to main drive shaft 2 through a drive pin. Driving pin 22 in turn is coupled to orbiting scroll 24 in such a manner that each rotation of driving disc 22/counterweight 26 results in one orbital revo-lution of orbiting scroll 24. The distal end of magnetic pick up 7 is located adjncent to and facing the rotation locus of counterweight 26, i.e., adjacent the outermost area through which counterweight 26 rotates.
The magnetic flux (0) which passes throllgh magnetic pickup 7, since half disk shaped counterweight 26 is magnetized, is at a high level when the A-B-A' portion of half disk shaped counterweight 26 i5 close to magnetic pickup 7, and is at a low level when this portion is not close to magnetic pickup 7~ as Q result, the magnetic flux which passes through magnetic pickup 7 is changed by the rotation of half disk shaped counterweight 26, and the voltage shown in the following formula (1) is generated in magnetic pickup 7 by electromagnetic induction.
d ~
e = - (1) d t When half disk shaped counterweight 26 shown in Figure 3 rotates in the direction of the illustrated arrow, the magnetic flux (0) which passes through magnetic pickup 7 is reduced as point A' passes pick up 7, and a positive voltage is generated in magnetic pickup 7 according to formula (1). Similarly, a negative voltage is generated at pickup 7 as point A passes it. That is, each time half disk shaped counterweight 26 rotates once, one pulse of positive voltage and one pulse OI negative voltage shown in Figure 4 are generated in magnetic pickup 7. Accordingly, if the number of pulses are measured, the number of compressor rotations can be detected. Because of its half-disc shape, counterweight 2~ functions as an asymmetric rotating member to generate the electrical pulses in pickup 7 which are ~%~ 7~2 correlflted to the rotation/orbiting of scroll 24, the compressing element.
Figure 5 shows an embodiment of the Invention wherein a magnetic pickup 7 is incorporated into a swash plate type compressor.
A ca m rotor 8, which is inclined on one end surface is rotated by the rotation of mflin drive shaft 2. A piston 10 reciprocates with ~he sway of a swash plate 9 which is coupled to the inclined plane of cam rotor 8.
A projection 81 radially projects from the outer circumference of cam rotor 5. Projection 81 extends around ~l portion of the cir-cumference Or cam rotor 8, so that it has end points similar to end points A and A' of counterweight 26~ Cflm rotor 8 is thus asymmetric and functions as in asymmetric rotating member so that the magnetic flux sensed by pickup 7 varies in the same manner during rotation of ca m rotor 8 as during rotation of counterweight 26. Magnetic flux at cam rotor 8, of course, results from the leakage of magnetic flux when electromagnet 32 is turned on. The rotation of the compressor drive in this embodiment is thus sensed in a manner similar to that of the first embodiment wherein a magnetic pickup to placed adjacent a rotating asymmetric member within the compressor housing.
As mentioned above, the fluid compressor in accordance with the present invention is equipped with an asymmetric rotating member which is substantially magneti~ed by the electromagnetic clutch, and a magnetic pickup is placed adjacent the rotation locus of the asym-metric rotating member within the compressor housing. The magnetic flux which passes through the magnetic pickup is changed by the sub-stantial varifltion of distance between portions of the asymmetric member and the magnetic pickup. The rotation of compressor's com-pressing element thus can be detected by measuring the voltage which is generated in the magnetic pickup. Thusl a lsrge space for a sensor in the compressor is not required and it is easy to mount on an auto-mobile. The number of rotations OI the compressor can be very ~' precisely detected since the number of output pulses from the magnetic pickup is generated in accordance with the rotation of main shaft.
This invention has been described in detail in connection with the preferred embodiments, but these are examples only and the inven-tion is not restricted thereto. It ~ill be easily understood, by those skilled in the art that other variations and modifications can be easily made within the scope of this invention.
!1~!
Claims (6)
1. A fluid compressor comprising a housing, a main drive shaft rotatably supported in the housing, an electromagnetic clutch mounted on said compressor housing for selectively coupling said main drive shaft to an external driving source, a compressing element drivingly coupled to said main drive shaft, an asymmetric rotating member located in said housing and coupled to said main drive shaft for rotary motion and for receiving magnetic flux leaking from said electromagnetic clutch through said main shaft drive, and detecting means for detecting the number of rotations of said compressing ele-ment, said detecting means comprising a magnetic pickup connected to said housing and having a portion located adjacent to the rotation locus of said asymmetric rotating member to sense the variations of magnetic flux as said asymmetric rotating member rotates past said magnetic pickup.
2. The fluid compressor of claim 1 wherein said asymmetric rotating member is a counterweight for balancing the centrifugal force of the rotating portions of said compressor.
3. Fluid compressor of claim 2 wherein said compressor is a scroll type compressor.
4. Fluid compressor of claim 1 wherein said asymmetric rotating member is a cam rotor.
5. Fluid compressor of claim 4 wherein said compressor is a swash plate type compressor.
6. In a fluid compressor wherein a compressing element carried in a compressor housing is driven by the rotary motion of a main drive shaft which is selectively coupled to an external drive source through an electromagnetic clutch and an asymmetric rotating member is located within the housing, is coupled to the main drive shaft and receives magnetic flux leaking from the electromagnetic clutch through the main drive shaft, the improvement comprising detecting means located at least partially within the compressor housing for detecting the number of rotations of said compressing element, said detecting means comprising a magnetic pickup connected to said housing and having a portion located adjacent to the rotation locus of said asymmetric rotating member to sense the variations of magnetic flux as said asymmetric rotating member rotates past said magnetic pickup.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32,673/59 | 1984-02-24 | ||
| JP59032673A JPS60178985A (en) | 1984-02-24 | 1984-02-24 | Compressor having rotation detecting function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1259972A true CA1259972A (en) | 1989-09-26 |
Family
ID=12365389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000474881A Expired CA1259972A (en) | 1984-02-24 | 1985-02-21 | Fluid compressor with rotational speed detecting device |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS60178985A (en) |
| AU (1) | AU3899885A (en) |
| CA (1) | CA1259972A (en) |
| DE (1) | DE3506063C2 (en) |
| FR (1) | FR2560299B1 (en) |
| GB (1) | GB2156906B (en) |
| IT (1) | IT1183405B (en) |
| SE (1) | SE459754B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62117571U (en) * | 1986-01-20 | 1987-07-25 | ||
| JPH0335891Y2 (en) * | 1986-09-04 | 1991-07-30 | ||
| JPS63191914A (en) * | 1987-02-05 | 1988-08-09 | Fuji Koki Seisakusho:Kk | Rotation detector for compressor driving part |
| DE8703108U1 (en) * | 1987-02-28 | 1988-03-31 | Leybold Ag, 5000 Koeln, De | |
| JPH0450465Y2 (en) * | 1987-06-19 | 1992-11-27 | ||
| US5540560A (en) * | 1993-04-14 | 1996-07-30 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Compressor with rotation detecting mechanism |
| JPH08319944A (en) * | 1995-05-26 | 1996-12-03 | Toyota Autom Loom Works Ltd | Compressor |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2243936C3 (en) * | 1972-09-07 | 1975-06-05 | Diessel Gmbh & Co, 3200 Hildesheim | Rotary piston meter |
| US4017217A (en) * | 1976-02-26 | 1977-04-12 | Westinghouse Electric Corporation | Overspeed protection system |
| JPS5819875B2 (en) * | 1980-03-18 | 1983-04-20 | サンデン株式会社 | Scroll compressor |
| JPS5735181A (en) * | 1980-08-09 | 1982-02-25 | Toyoda Autom Loom Works Ltd | Driving force control device for compressor |
| DE3130338C2 (en) * | 1980-08-26 | 1986-08-14 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, Kariya, Aichi | Interrupt coupling for separating a swash plate compressor from a drive unit |
| AU545656B2 (en) * | 1980-09-30 | 1985-07-25 | Sanden Corporation | Scroll pump seal |
| JPS5882082A (en) * | 1981-11-11 | 1983-05-17 | Toyoda Autom Loom Works Ltd | Abnormality detecting mechanism in swash plate type compressor |
| JPS58187769U (en) * | 1982-06-08 | 1983-12-13 | 株式会社ボッシュオートモーティブ システム | Compressor rotation speed detection device |
-
1984
- 1984-02-24 JP JP59032673A patent/JPS60178985A/en active Pending
-
1985
- 1985-02-20 AU AU38998/85A patent/AU3899885A/en not_active Abandoned
- 1985-02-21 CA CA000474881A patent/CA1259972A/en not_active Expired
- 1985-02-21 DE DE3506063A patent/DE3506063C2/en not_active Expired - Lifetime
- 1985-02-22 GB GB08504623A patent/GB2156906B/en not_active Expired
- 1985-02-22 SE SE8500880A patent/SE459754B/en not_active IP Right Cessation
- 1985-02-22 IT IT19610/85A patent/IT1183405B/en active
- 1985-02-25 FR FR8502658A patent/FR2560299B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| GB2156906B (en) | 1987-07-01 |
| AU3899885A (en) | 1985-09-05 |
| GB8504623D0 (en) | 1985-03-27 |
| SE459754B (en) | 1989-07-31 |
| GB2156906A (en) | 1985-10-16 |
| DE3506063C2 (en) | 1993-10-14 |
| SE8500880D0 (en) | 1985-02-22 |
| FR2560299A1 (en) | 1985-08-30 |
| FR2560299B1 (en) | 1992-11-13 |
| SE8500880L (en) | 1985-08-25 |
| JPS60178985A (en) | 1985-09-12 |
| IT1183405B (en) | 1987-10-22 |
| DE3506063A1 (en) | 1985-08-29 |
| IT8519610A0 (en) | 1985-02-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |