CN109899286B - Vortex fluid displacement device with floating electromagnetic mechanism - Google Patents
Vortex fluid displacement device with floating electromagnetic mechanism Download PDFInfo
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- CN109899286B CN109899286B CN201910234041.XA CN201910234041A CN109899286B CN 109899286 B CN109899286 B CN 109899286B CN 201910234041 A CN201910234041 A CN 201910234041A CN 109899286 B CN109899286 B CN 109899286B
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- 238000005303 weighing Methods 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 11
- 230000000737 periodic effect Effects 0.000 claims description 10
- 239000000696 magnetic material Substances 0.000 claims description 8
- 239000013013 elastic material Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 abstract description 14
- 230000001276 controlling effect Effects 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 3
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- 238000007906 compression Methods 0.000 description 7
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- 229920000642 polymer Polymers 0.000 description 2
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- 229910000831 Steel Inorganic materials 0.000 description 1
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Abstract
The invention discloses a vortex fluid displacement device with a floating electromagnetic mechanism, which comprises: the movable scroll axially floats an electromagnetic mechanism, and the movable scroll is driven by electromagnetic force to move towards the fixed scroll in a compliance manner; it comprises the following steps: a magnetic circuit ring for generating electromagnetic force; a suction plate capable of being attracted or repelled by the magnetic circuit ring; the electromagnetic attraction force and/or the electromagnetic repulsion force between the magnetic circuit ring and the attraction plate enable the movable scroll and the fixed scroll to overcome axial separation force generated by the air chamber and the air pressure in the high-pressure area and the low-pressure area so as to keep contact seal between the movable scroll and the fixed scroll; the control system is used for controlling and regulating the magnitude of the electromagnetic force and the time phase of the electromagnetic force. The invention provides a thrust meeting the sealing requirement in real time at each position in each period, so as to ensure that the sealing force actually required at any moment and the provided electromagnetic thrust maintain the set magnitude and phase relation in real time, and finally, the invention achieves high-efficiency and reliable operation.
Description
Technical Field
The invention relates to the technical field of floating scroll compressors, in particular to a scroll fluid displacement device with a floating electromagnetic mechanism.
Background
In a floating scroll compressor, how to provide proper axial sealing force for a moving scroll and a fixed scroll is an important factor affecting indexes such as running power consumption, performance, service life, reliability and the like of the whole machine. In the operation process of the scroll compressor, the axial gas separation force generated by compressed gas between the movable scroll and the fixed scroll is not a fixed value, but is changed repeatedly in a certain curve in a certain interval by taking one rotation as a period. The conventional solution is generally applicable to both the movable scroll and the fixed scroll, and the movable scroll is taken as an example for illustration.
The first is to provide a constant force to the moving scroll to overcome the axial separation force of the compressed gas on the moving scroll, the constant force is larger than the thrust of the maximum axial gas separation force in the operation process, and the mode is that the spring force is adopted, the gas thrust of constant air pressure is introduced into the back pressure chamber of the moving scroll, and the like, for example, an improved scroll fluid displacement device with omnibearing compliant suspension scroll is disclosed in patent No. ZL 200610121150.3.
And the second is to introduce the gas whose pressure varies periodically from the compression chamber of the scroll into the back pressure chamber. The back pressure generated by the gas pressure can follow the change of the axial separation force born by the movable scroll to a certain extent, and the constant force such as a spring is added, so that the axial balance force (also called axial sealing force) of the floating scroll can synchronously change with the axial separation force born by the floating scroll to a certain extent, thereby reducing the resultant force of the axial direction.
For some models, when the axial gas separation force is not changed greatly in one period, the conventional mode can meet the use requirement; however, for a model with a large variation range of axial gas separation force in one period or a high energy efficiency ratio requirement, especially for an oil-free compressor, only the combined force of axial balance force and separation force is still large in a conventional manner. The contact force between the movable scroll and the fixed scroll is larger, so that the friction force and the power consumption are increased, the service life of the scroll is prolonged, the operation reliability is reduced, and the like.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a scroll fluid displacement device having a floating electromagnetic mechanism.
The technical scheme adopted by the invention is as follows:
A scroll fluid displacement device having a floating electromagnetic mechanism, comprising:
The movable scroll is provided with a first end plate, and a first spiral side wall is fixedly connected to a base surface of the first end plate;
the fixed scroll is provided with a second end plate, a second spiral side wall is fixedly connected to the base surface of the second end plate, and the first spiral side wall is meshed with the second spiral side wall;
A rotation driving shaft driving the movable scroll to make the movable scroll make an orbital motion with respect to the fixed scroll;
a housing supporting the fixed scroll and the rotary drive shaft;
When the movable scroll moves in an orbital motion relative to the fixed scroll, a movable air chamber with changeable volume and a high-pressure area and a low-pressure area of working fluid are formed among the first spiral side wall, the second spiral side wall, the base surface of the first end plate and the base surface of the second end plate;
Wherein, still include: the movable scroll axial floating electromagnetic mechanism drives the movable scroll to float towards the fixed scroll in a compliance way through electromagnetic force;
the movable scroll axial floating electromagnetic mechanism comprises:
at least one magnetic circuit ring, wherein the magnetic circuit ring is provided with an excitation coil and is used for generating electromagnetic force;
A suction plate capable of being attracted or repelled by the magnetic circuit ring;
An electromagnetic attraction force and/or an electromagnetic repulsion force between the magnetic circuit ring and the attraction plate enable the movable scroll and the fixed scroll to overcome axial separation force generated by gas pressure in the air chamber and the high pressure area and the low pressure area so as to keep contact seal between the movable scroll and the fixed scroll;
Further comprises: and the control system is used for controlling and regulating the magnitude of the electromagnetic force and the time phase of the electromagnetic force.
The above-mentioned vortex fluid displacement device with floating electromagnetic mechanism, wherein, the electromagnetic attraction force and/or the resultant force of the electromagnetic repulsion force and the auxiliary force can overcome the axial separation force generated by the air chamber and the gas pressure in the high pressure area and the low pressure area so as to keep the contact seal between the movable scroll and the fixed scroll, wherein, the auxiliary force is spring force, elastic force of elastic materials such as rubber and high polymer, elastic force of elastic structure and/or fluid pressure.
The vortex fluid displacement device with the floating electromagnetic mechanism is characterized in that the magnetic circuit ring and the suction plate are made of magnetic conductive materials and/or permanent magnetic materials.
The above-mentioned vortex fluid displacement device with floating electromagnetic mechanism, wherein, the control system includes: the system comprises an exhaust pressure signal detection system, an excitation coil power supply system, a weighing sensor system and a motor shaft phase detection system; the control system controls and regulates a periodic variation curve of electromagnetic force, so that the periodic variation curve of the electromagnetic force and a curve of axial gas separation force of the movable scroll and the fixed scroll synchronously change, and a PV value between the movable scroll and the fixed scroll is not more than 10mpa x m/s.
Wherein the PV value is the product of the contact stress between the movable scroll and the fixed scroll and the linear velocity of the mutual movement between the movable scroll and the fixed scroll.
A scroll fluid displacement device having a floating electromagnetic mechanism, comprising:
The movable scroll is provided with a first end plate, and a first spiral side wall is fixedly connected to a base surface of the first end plate;
the fixed scroll is provided with a second end plate, a second spiral side wall is fixedly connected to the base surface of the second end plate, and the first spiral side wall is meshed with the second spiral side wall;
A rotation driving shaft driving the movable scroll to make the movable scroll make an orbital motion with respect to the fixed scroll;
a housing supporting the fixed scroll and the rotary drive shaft;
When the movable scroll moves in an orbital motion relative to the fixed scroll, a movable air chamber with changeable volume and a high-pressure area and a low-pressure area of working fluid are formed among the first spiral side wall, the second spiral side wall, the base surface of the first end plate and the base surface of the second end plate;
Wherein, still include: the fixed scroll axial floating electromagnetic mechanism drives the fixed scroll to move towards the movable scroll in a compliant floating manner through electromagnetic force;
the fixed scroll axial floating electromagnetic mechanism comprises:
at least one magnetic circuit ring, wherein the magnetic circuit ring is provided with an excitation coil and is used for generating electromagnetic force;
A suction plate capable of being attracted or repelled by the magnetic circuit ring;
An electromagnetic attraction force and/or an electromagnetic repulsion force between the magnetic circuit ring and the attraction plate enable the movable scroll and the fixed scroll to overcome axial separation force generated by gas pressure in the air chamber and the high pressure area and the low pressure area so as to keep contact seal between the movable scroll and the fixed scroll;
Further comprises: and the control system is used for controlling and regulating the magnitude of the electromagnetic force and the time phase of the electromagnetic force.
The above-mentioned vortex fluid displacement device with floating electromagnetic mechanism, wherein, the electromagnetic attraction force and/or the resultant force of the electromagnetic repulsion force and the auxiliary force can overcome the axial separation force generated by the air chamber and the gas pressure in the high pressure area and the low pressure area so as to keep the contact seal between the movable scroll and the fixed scroll, wherein, the auxiliary force is spring force, elastic force of elastic materials such as rubber and high polymer, elastic force of elastic structure and/or fluid pressure.
The vortex fluid displacement device with the floating electromagnetic mechanism is characterized in that the magnetic circuit ring and the suction plate are made of magnetic conductive materials and/or permanent magnetic materials.
The above-mentioned vortex fluid displacement device with floating electromagnetic mechanism, wherein, the control system includes: the system comprises an exhaust pressure signal detection system, an excitation coil power supply system, a weighing sensor system and a motor shaft phase detection system; the control system controls and regulates a periodic variation curve of electromagnetic force, so that the periodic variation curve of the electromagnetic force and a curve of axial gas separation force of the movable scroll and the fixed scroll synchronously change, and a PV value between the movable scroll and the fixed scroll is not more than 10mpa x m/s.
Wherein the PV value is the product of the contact stress between the movable scroll and the fixed scroll and the linear velocity of the mutual movement between the movable scroll and the fixed scroll.
The invention generates a thrust force which synchronously changes and has opposite directions with the axial separation force generated by the periodically changing gas pressure born by the movable scroll or the fixed scroll by the way of the cooperation of the permanent magnet and the exciting coil or the cooperation of the magnetic conduction material and the exciting coil on the front surface/back surface of the movable scroll or the back surface of the fixed scroll, and realizes the contact sealing effect between the movable scroll and the fixed scroll by utilizing the thrust force.
According to the invention, an axial separation force periodic variation curve set of axial gas between the movable scroll and the fixed scroll under different exhaust pressures is calculated through a formula and is input into a control system, and the control system automatically selects a corresponding target curve according to the acquired exhaust pressure signals; according to the target curve, the control system adjusts the voltage and current on the excitation coil to generate primary electromagnetic force, the electromagnetic force is measured by the weighing sensor after being generated, signals output by the weighing sensor are transmitted to the control system, the control system compares the actual measured data curve with the target theoretical thrust curve in real time, and then the voltage and current on the excitation coil are finely adjusted, so that closed-loop control is repeatedly realized, and finally the provided actual electromagnetic force curve and the theoretical thrust curve are completely synchronous.
The curve of electromagnetic force and the curve of the actually required thrust can be completely consistent in size and period by the mode, but the phase of the theoretical curve is consistent or nearly consistent with the meshing phase between the movable scroll and the fixed scroll, and preferably, the PV value between the movable scroll and the fixed scroll is not more than 10 mpa. The invention leads out the phase signal of the rotating shaft from the rotating shaft of the motor, the position of the phase signal of the rotating shaft is fixed with the meshing phase relation between the actual moving scroll and the fixed scroll from the mechanical structure, the meshing phase signal between the actual moving scroll and the fixed scroll transmitted by the rotating shaft is input into the control system, and the phase of the theoretical thrust curve is calibrated in real time. Therefore, the sealing force actually required at any moment and the electromagnetic force provided can be ensured to maintain the set magnitude and phase relation in real time, and finally, the high-efficiency and reliable operation is achieved.
The invention adopts the technology, so that compared with the prior art, the invention has the positive effects that:
(1) The invention provides a thrust solution of a fully-floating scroll compressor, which provides proper axial sealing force in real time by wholly or partly relying on electromagnetic force, namely, provides a thrust which just meets the sealing requirement in real time at each position in each period so as to ensure that the sealing force actually required at any moment and the provided electromagnetic thrust maintain the set size and phase relation in real time, and finally, the invention achieves high-efficiency and reliable operation.
Drawings
FIG. 1 is a graph showing theoretical calculated axial separation force curves of a fixed scroll and a movable scroll for each rotation of a compressor under a certain set condition, and comparing axial sealing force curves provided by adopting a conventional thrust mode with axial sealing force curves provided by adopting electromagnetic force.
Fig. 2 is a schematic diagram of the operation of the control system of the scroll fluid displacement device with floating electromagnetic mechanism of the present invention.
FIG. 3 is a cross-sectional view of a first embodiment of a scroll fluid displacement device having a floating electromagnetic mechanism of the present invention.
FIG. 4 is a cross-sectional view of the assembled assembly of the suction plate, the orbiting scroll seat and the orbiting scroll of the first embodiment of the scroll fluid displacement device with floating electromagnetic mechanism of the present invention.
Fig. 5 is a three-dimensional view of the assembled assembly of suction plate, orbiting scroll seat and orbiting scroll of the first embodiment of the scroll fluid displacement device with floating electromagnetic mechanism of the present invention.
Fig. 6 is a cross-sectional view of an assembly of a magnetic circuit ring, field coil and magnetic circuit ring support of a first embodiment of a scroll fluid displacement device with a floating electromagnetic mechanism of the present invention.
Fig. 7 is a three-dimensional view of the assembly of the magnetic circuit ring, the exciting coil and the magnetic circuit ring support of the first embodiment of the vortex fluid displacement apparatus with floating electromagnetic mechanism of the present invention.
FIG. 8 is a schematic view of the mounting location of the load cell, support dowel pin on the housing of a first embodiment of a scroll fluid displacement device with a floating electromagnetic mechanism of the present invention.
Fig. 9 is a view of the position and spatial cross-section of the wire run-out for energizing the field coil of the first embodiment of the scroll fluid displacement device with floating electromagnetic mechanism of the present invention.
FIG. 10 is a cross-sectional view of a second embodiment of a scroll fluid displacement device having a floating electromagnetic mechanism of the present invention.
FIG. 11 is a cross-sectional view of the assembly of the magnetic circuit ring, load cell and stationary wrap of a second embodiment of a scroll fluid displacement device with a floating electromagnetic mechanism of the present invention.
FIG. 12 is a three-dimensional view of the assembled assembly of the magnetic circuit ring, load cell and stationary wrap of a second embodiment of a scroll fluid displacement device with a floating electromagnetic mechanism of the present invention.
FIG. 13 is a cross-sectional view of the assembled assembly of suction plate, pull rod and orbiting scroll of a second embodiment of a scroll fluid displacement device having a floating electromagnetic mechanism of the present invention.
FIG. 14 is a three-dimensional view of the assembled assembly of suction plate, pull rod and orbiting scroll of a second embodiment of a scroll fluid displacement device having a floating electromagnetic mechanism of the present invention.
FIG. 15 is a cross-sectional view of a third embodiment of a scroll fluid displacement device having a floating electromagnetic mechanism of the present invention.
FIG. 16 is a cross-sectional view of a suction plate, plunger and fixed wrap assembly of a third embodiment of a scroll fluid displacement device having a floating electromagnetic mechanism of the present invention.
FIG. 17 is a three-dimensional view of the suction plate, plunger and stationary wrap assembly of a third embodiment of a scroll fluid displacement device with a floating electromagnetic mechanism of the present invention.
FIG. 18 is a cross-sectional view of an assembled assembly of a load cell, stationary wrap and magnetic circuit ring of a third embodiment of a scroll fluid displacement device with a floating electromagnetic mechanism of the present invention.
FIG. 19 is a three-dimensional view of the location of a fixed scroll locating pin, compression bar channel on a fixed scroll seat of a third embodiment of a scroll fluid displacement device with a floating electromagnetic mechanism of the present invention.
FIG. 20 is a three-dimensional view of the assembled assembly of a load cell, stationary wrap and magnetic circuit ring of a third embodiment of a scroll fluid displacement device with a floating electromagnetic mechanism of the present invention.
In the accompanying drawings: 500. a control system; 510. an exhaust pressure signal detection system; 520. a field coil power supply system; 530. a load cell system; 540. a motor rotating shaft phase signal detection system; 1. a moving scroll core; 2. a movable scroll seat; 3. a magnetic circuit ring; 4. an exciting coil; 5. a magnetic circuit ring positioning pin; 6. a magnetic circuit ring support; 7. a weighing sensor; 8. a motor housing; 9. a crank shaft; 11. positioning pins of the magnetic circuit ring support; 12. a suction plate; 13. a fixed scroll core; 14. a fixed scroll seat; 15. a base; 16. a drive bearing; 17. a joint; 121. an excitation coil outgoing line channel; 601. an excitation coil outgoing line channel; 151. an excitation coil outgoing line channel; 152. a weighing sensor lead-out wire channel; 18. a magnetic circuit ring; 19. an exciting coil; 21. a dowel pin fastener; 22. a magnetic circuit ring positioning pin; 23. a weighing sensor; 24. a fixed scroll; 25. a suction plate; 26. suction plate fasteners; 27. a pull rod; 28. a moving scroll core; 29. a movable scroll seat; 241. the pull rod passes through the area; 181. the excitation coil leads pass through the region; 31. a load cell base; 32. a load cell seat fastener; 33. a weighing sensor; 34. a load cell fastener; 35. a magnetic circuit ring; 36. an exciting coil; 37. a fixed scroll core positioning pin; 38. a fixed scroll seat; 39. a magnetic circuit ring positioning pin; 41. a suction plate; 42. suction plate fasteners; 43. a compression bar; 44. a fixed scroll core fastener; 45. a fixed scroll core; 46. a moving scroll core; 47. a movable scroll seat; 470. a movable scroll; 380. a fixed scroll; 381. a compression bar channel; 351. and an excitation coil outgoing line channel.
Detailed Description
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
Referring to fig. 1 to 3, a curve a in fig. 1 is a normal thrust curve (N), a curve b in fig. 1 is an electromagnetic thrust curve (N), and a curve c in fig. 1 is an axial separation force curve (N).
Compressor 100 has a base 15, a fixed scroll 140, a motor 800, a crank shaft 9, and a moving scroll 200. Fixed scroll 140 includes fixed scroll core 13 and fixed scroll seat 14. The movable scroll 200 comprises a movable scroll core 1 and a movable scroll seat 2, and a bearing seat 201 is arranged on the movable scroll seat 2. The crank shaft 9 is supported by bearings and is rotatable about its axis. Fixed scroll core 13 has an end plate 131 and a scroll element 132 extending from end plate 131. The orbiting scroll 1 has an end plate 101 and a scroll element 102 extending from the end plate 101, and an orbiting scroll seat 2 fixed to a lower portion of the end plate 101. The end of the crankshaft 9 has an eccentric crankpin 901. The orbiting scroll driving bearing 16 fixed in the bearing housing 201 is driven by the joint 17, thereby driving the orbiting scroll 1. In operation, fixed scroll 140 and orbiting scroll 200 maintain an angular displacement of 180 ° and a distance in the radial direction, the orbiting radius Ror. At least one sealed plenum is formed between scroll element 132 and scroll element 102 and between end plate 131 and end plate 101.
There are two main types of axially compliant floating techniques for scrolls: the movable scroll moves to the fixed scroll to float in compliance; alternatively, the fixed scroll is caused to float in compliance with the orbiting scroll.
The orbiting scroll is provided with an axially compliant CSPS mechanism (a mechanism with a combination of a central crank shaft-orbiting joint and a peripheral crank pin-wobble connection, see improved scroll fluid displacement apparatus with an omni-directional compliant floating scroll, patent No. ZL 200610121150.3) capable of compliant floating of the fixed scroll in the axial and/or radial directions.
Another axially compliant floating technique, U.S. Pat. No.4,767,293 (Jean-LucCaillatetal), describes a mechanism for axially compliant floating from a fixed scroll to a movable scroll.
The working fluid enters the suction passage through the air inlet on the fixed scroll seat 14, is compressed in the orbiting motion of the scrolls by the compression chamber formed between the scrolls, reaches the central chamber 133, and is discharged outside the machine through the air discharge hole 141.
Embodiment one:
The working principle and the first embodiment of the invention are that an electromagnetic force component is arranged between a movable scroll and a base. The electromagnetic force component of the first embodiment comprises a magnetic conduction material and an excitation coil, and converts the suction force or the thrust between the magnetic circuit ring and the suction plate into the axial thrust of the movable scroll through a mechanical structure, so that the effect of overcoming the axial gas separation force of the movable scroll and the fixed scroll is realized. The electromagnetic force may provide a desired electromagnetic force in combination with the permanent magnet, in addition to the electromagnetic force generated by the exciting coil.
The main improvement of the first embodiment is that, compared with the traditional back pressure chamber, the gas pressure, the spring force and other forces, an electromagnetic mechanism which can generate electromagnetic force to drive the movable scroll to the fixed scroll to make the movable scroll float axially in compliance with the floating is introduced, so as to generate electromagnetic force which can synchronously change according to the change of the gas separation force born by the scroll. For convenience and brevity of description, the principle of introduction of electromagnetic force and the working mechanism are mainly described herein.
Specifically, referring to fig. 3 to 9, there is shown a first preferred scroll fluid displacement device having a floating electromagnetic mechanism, wherein the magnetic circuit ring 3 is a magnetically conductive steel ring in which the exciting coil 4 is embedded, and is integrally and fixedly installed between the movable scroll seat 2 and the suction plate 12, and the magnetic circuit ring 3 is stationary and supported on the magnetic circuit ring support 6. A certain gap is maintained between the upper part of the magnetic circuit ring 3 and the movable scroll seat 2, and a gap between the magnetic circuit ring 3 and the suction plate 12, called a magnetic gap, needs to be controlled within a certain range.
In addition, as a preferred embodiment, the magnetic gap is uniform and is as small as possible while ensuring the wear compensation of the axially floating parts (scroll, suction plate/thrust plate and piston, etc.). The smaller the magnetic gap, the smaller the amount of power required under the same electromagnetic force condition.
In addition, as a preferred embodiment, the movable scroll seat 2 is made of a non-magnetic material, and the magnetic circuit ring 3 and the suction plate 12 are made of a magnetic material or a permanent magnetic material, as required.
Further, as a preferred embodiment, the exciting coil 4 is supplied with a certain current by the exciting coil power supply system 520. After the power is on, the exciting coil 4 generates an electromagnetic field, and the electromagnetic field forms a magnetic field loop in a magnetic circuit formed by the magnetic circuit ring 3 and the suction plate 12.
Further, as a preferred embodiment, since there is a certain magnetic gap between the magnetic circuit ring 3 and the suction plate 12, a magnetic field suction force is generated between the magnetic circuit ring 3 and the suction plate 12, that is, a force for driving the suction plate 12 to move upwards and the magnetic circuit ring 3 to move downwards is generated, and the two forces are in the same direction and opposite to each other. The suction plate 12 is fixed with the movable scroll seat 2 and the movable scroll core 1, and the upward force of the suction plate 12 is transmitted to the movable scroll core 1 to drive the movable scroll core 1 to approach the fixed scroll core 13, which can be used for overcoming the axial separation force generated by the compressed gas between the movable scroll 200 and the fixed scroll 140.
Still further, as a preferred embodiment, the downward running force of the magnetic circuit ring 3 acts on the magnetic circuit ring support 6 and is then transferred to the three load cells 7. The magnitude of the suction force between the magnetic circuit ring 3 and the suction plate 12 can be monitored in real time by collecting the electric signals output by the weighing sensor 7 and processing the electric signals through the weighing sensor system 530. The collected suction force periodic curve is transmitted to the control system 500 in real time, and is compared with the theoretical curve of the required thrust in the control system 500 in real time, and the power supply value of the exciting coil 4 is adjusted in real time through the exciting coil power supply system 520 according to the deviation, so that the closed-loop control is realized.
Specifically, the theoretical curve of the required thrust is a set of curves, and the control system 500 can automatically select the theoretical curve by collecting several key state parameters of the compressor according to different working states of the compressor. The phase relation and magnitude of the current generated by the exciting coil power supply system 520 and the theoretical curve are adjusted by the motor shaft phase signal system 540 and the exhaust pressure signal detection system 510 respectively, so as to achieve the purpose of minimizing the resultant force of the axial separation force and the axial thrust force (comprising electromagnetic force, traditional back pressure air chamber, pressure spring and the like) applied on the movable scroll 200 under the condition of meeting the contact sealing requirement of the movable scroll 200 and the fixed scroll 140. Thereby achieving axial compliant floating of orbiting scroll 200 relative to fixed scroll 140.
The electromagnetic attraction force scheme adopted in the first embodiment of the invention can be implemented by using electromagnetic repulsion force and other mechanical structures which are simply changed.
Embodiment two:
the second working principle and the second embodiment of the invention are to introduce a movable scroll axial floating electromagnetic mechanism which can generate electromagnetic force to drive the movable scroll to the fixed scroll to float in compliance. In the second embodiment, the exciting coil is provided at one end of the fixed scroll. The structure and function of the electromagnetic force control system in the second embodiment are the same as those in the first embodiment, and will not be described again.
The electromagnetic force component is composed of magnetic conductive material and exciting coil, and converts the suction force between the magnetic circuit ring and suction plate into the pulling force of the moving scroll through a mechanical structure, so as to overcome the axial gas separation force and other stress requirements of the moving scroll and the fixed scroll and ensure that the moving scroll and the fixed scroll keep the most possible slight contact and sealing effect.
Specifically, referring to fig. 10 to 14, there is shown a second preferred scroll fluid displacement device with a floating electromagnetic mechanism, in which a magnetic circuit ring 18 made of a magnetically conductive material is embedded with an exciting coil 19, and integrally mounted on a fixed scroll 24 through a magnetic circuit ring positioning pin 22 and a positioning pin fastener 21.
Furthermore, as a preferred embodiment, the load cell 23 is mounted between the fixed scroll 24 and the magnetic circuit ring 18, and a certain degree of freedom is left in the axial direction of the magnetic circuit ring 18 after the mounting is completed, so that the load cell 23 is not forced when the exciting coil 19 is not energized.
In addition, as a preferred embodiment, a suction plate 25 is installed between the magnetic circuit ring 18 and the fixed scroll 24. A certain gap, also called a magnetic gap, is kept between the suction plate 25 and the magnetic circuit ring 18; a certain gap is kept between the suction plate 25 and the fixed scroll 24, so that the suction plate 25 is not contacted with the fixed scroll 24 in the moving process.
Further, as a preferred embodiment, the fixed scroll 24 is made of a non-magnetic material. When the exciting coil 19 is energized, the electromagnetic field forms a loop in the magnetic circuit enclosed by the magnetic circuit ring 18 and the attraction plate 25.
Further, as a preferred embodiment, because of the magnetic gap between the magnetic circuit ring 18 and the suction plate 25, a magnetic field suction force is generated between the magnetic circuit ring 18 and the suction plate 25, that is, a force for moving the suction plate 25 upward and a force for moving the magnetic circuit ring 18 downward are generated in opposite directions. The force of downward movement of the magnetic circuit ring 18 acts on the load cell 23, and the magnitude of the force can be detected by the load cell 23 in real time. The upward force of the suction plate 25 is transmitted to the movable scroll seat 29 through the pull rod 27, and the movable scroll seat 29 drags the movable scroll core 28 upwards to approach the fixed scroll 24, so that the axial gas separation force between the movable scroll and the fixed scroll is overcome.
Still further, as a preferred embodiment, the magnitude, period, etc. of the suction provided by the excitation coil 19 can be controlled in a closed loop by the control system 500, thereby ensuring efficient and reliable operation of the scroll compressor. The structure and function of the control system 500 are the same as those of the first embodiment, and will not be described again.
The electromagnetic attraction force scheme adopted in the second embodiment of the invention can be implemented by using electromagnetic repulsive force and other mechanical structures which are simply changed.
Embodiment III:
The third working principle and the embodiment of the invention are to introduce a fixed scroll axial floating electromagnetic mechanism which can generate electromagnetic force to drive the fixed scroll to the movable scroll to float in compliance. In the third embodiment, the exciting coil is mounted on one end of the fixed scroll. The structure and function of the electromagnetic force control system in the third embodiment are the same as those in the first embodiment, and will not be described again here.
The electromagnetic force component is composed of magnetic conductive material and exciting coil, and converts the suction force between the magnetic circuit ring and suction plate into the thrust force for the fixed scroll through a mechanical structure, so as to overcome the requirements of axial gas separation force and other stress of the movable scroll and the fixed scroll and ensure that the movable scroll and the fixed scroll keep the most possible slight contact and sealing effect.
Referring specifically to fig. 15-20, a third preferred scroll fluid displacement device having a floating electromagnetic mechanism is shown wherein a suction plate 41 is connected to a stationary scroll core 45 by a suction plate fastener 42, a compression bar 43, a stationary scroll core fastener 44, forming a stationary scroll core axial float assembly.
Furthermore, as a preferred embodiment, the positional relationship between fixed scroll core 45 and movable scroll core 46 is defined by three fixed scroll core positioning pins 37, and the axial guiding of the fixed scroll core axial floating assembly is accomplished by the outer circle of the contour of fixed scroll core 45 and the three fixed scroll core positioning pins 37.
In addition, as a preferred embodiment, the suction plate 41 is made of a magnetically conductive material. Three load cells 33 are mounted on the load cell base 31 by load cell fasteners 34; preferably, load cell housing 31 is secured to fixed scroll housing 38 by load cell housing fastener 32; the space formed between the weighing sensor seat 31 and the fixed scroll seat 38 is used for placing the magnetic circuit ring 35, and the exciting coil 36 is embedded in the magnetic circuit ring 35; the radial position of the magnetic circuit ring 35 is positioned on the fixed scroll seat 38 through the magnetic circuit ring positioning pin 39, and the above components form a static component of the electromagnetic thrust system.
Further, as a preferred embodiment, after the static assembly and the axial floating assembly are mounted together, a gap, also referred to as a magnetic gap, is maintained between the suction plate 41 and the magnetic circuit ring 35. When the exciting coil 36 is energized, the electromagnetic field forms a loop in the magnetic circuit enclosed by the magnetic circuit ring 35 and the suction plate 41.
Further, as a preferred embodiment, since there is a magnetic gap between the magnetic circuit ring 35 and the suction plate 41, a magnetic field suction force is generated between the magnetic circuit ring 35 and the suction plate 41, that is, a force for moving the suction plate 41 downward and a force for moving the magnetic circuit ring 35 upward are generated in opposite directions. The force of upward movement of the magnetic circuit ring 35 acts on the load cell 33, and the magnitude thereof can be detected by the load cell 33 in real time. The downward force of suction plate 41 will be transmitted by compression bar 43 to the given scroll core 45 to approach the moving scroll 470, and the effect of overcoming the axial gas separation force between the moving scroll and the fixed scroll is finally achieved.
Further, as a preferred embodiment, the magnitude, period, etc. of the suction provided by the field coil 36 may be controlled in a closed loop by the control system 500 to ensure efficient and reliable operation of the scroll compressor. The structure and function of the control system 500 are the same as those of the first embodiment, and will not be described again here.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the embodiments and scope of the present invention, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present invention, and are intended to be included in the scope of the present invention.
Claims (6)
1. A scroll fluid displacement device having a floating electromagnetic mechanism, comprising:
The movable scroll is provided with a first end plate, and a first spiral side wall is fixedly connected to a base surface of the first end plate;
the fixed scroll is provided with a second end plate, a second spiral side wall is fixedly connected to the base surface of the second end plate, and the first spiral side wall is meshed with the second spiral side wall;
A rotation driving shaft driving the movable scroll to make the movable scroll make an orbital motion with respect to the fixed scroll;
a housing supporting the fixed scroll and the rotary drive shaft;
When the movable scroll moves in an orbital motion relative to the fixed scroll, a movable air chamber with changeable volume and a high-pressure area and a low-pressure area of working fluid are formed among the first spiral side wall, the second spiral side wall, the base surface of the first end plate and the base surface of the second end plate;
characterized by further comprising: the movable scroll axial floating electromagnetic mechanism drives the movable scroll to float towards the fixed scroll in a compliance way through electromagnetic force;
the movable scroll axial floating electromagnetic mechanism comprises:
at least one magnetic circuit ring, wherein the magnetic circuit ring is provided with an excitation coil and is used for generating electromagnetic force;
A suction plate capable of being attracted or repelled by the magnetic circuit ring;
An electromagnetic attraction force and/or an electromagnetic repulsion force between the magnetic circuit ring and the attraction plate enable the movable scroll and the fixed scroll to overcome axial separation force generated by gas pressure in the air chamber and the high pressure area and the low pressure area so as to keep contact seal between the movable scroll and the fixed scroll;
Further comprises: the control system is used for controlling and adjusting the magnitude of the electromagnetic force and the time phase of the electromagnetic force;
the control system includes: the system comprises an exhaust pressure signal detection system, an excitation coil power supply system, a weighing sensor system and a motor shaft phase detection system; the control system controls and adjusts a periodic variation curve of electromagnetic force to enable the periodic variation curve of the electromagnetic force to be synchronously changed with a curve of axial gas separation force of the movable scroll and the fixed scroll, so that a PV value between the movable scroll and the fixed scroll is not more than 10mpa x m/s, wherein the PV value is a product of contact stress between the movable scroll and the fixed scroll and a linear speed of mutual movement between the movable scroll and the fixed scroll.
2. A scroll fluid displacement device with floating electromagnetic mechanism according to claim 1, wherein the combined force of the electromagnetic attraction force and/or the electromagnetic repulsion force and the auxiliary force is capable of overcoming the axial separation force generated by the gas pressure in the gas chamber and the high pressure region and the low pressure region to maintain the contact seal between the movable scroll and the fixed scroll, wherein the auxiliary force is a spring force, an elastic force of an elastic material, an elastic force of an elastic structure, and/or a fluid pressure.
3. The scroll fluid displacement device with floating electromagnetic mechanism of claim 2, wherein the magnetic circuit ring and the suction plate are made of magnetically permeable material and/or permanent magnetic material.
4. A scroll fluid displacement device having a floating electromagnetic mechanism, comprising:
The movable scroll is provided with a first end plate, and a first spiral side wall is fixedly connected to a base surface of the first end plate;
the fixed scroll is provided with a second end plate, a second spiral side wall is fixedly connected to the base surface of the second end plate, and the first spiral side wall is meshed with the second spiral side wall;
A rotation driving shaft driving the movable scroll to make the movable scroll make an orbital motion with respect to the fixed scroll;
a housing supporting the fixed scroll and the rotary drive shaft;
When the movable scroll moves in an orbital motion relative to the fixed scroll, a movable air chamber with changeable volume and a high-pressure area and a low-pressure area of working fluid are formed among the first spiral side wall, the second spiral side wall, the base surface of the first end plate and the base surface of the second end plate;
Characterized by further comprising: the fixed scroll axial floating electromagnetic mechanism drives the fixed scroll to move towards the movable scroll in a compliant floating manner through electromagnetic force;
the fixed scroll axial floating electromagnetic mechanism comprises:
at least one magnetic circuit ring, wherein the magnetic circuit ring is provided with an excitation coil and is used for generating electromagnetic force;
A suction plate capable of being attracted or repelled by the magnetic circuit ring;
An electromagnetic attraction force and/or an electromagnetic repulsion force between the magnetic circuit ring and the attraction plate enable the movable scroll and the fixed scroll to overcome axial separation force generated by gas pressure in the air chamber and the high pressure area and the low pressure area so as to keep contact seal between the movable scroll and the fixed scroll;
Further comprises: the control system is used for controlling and adjusting the magnitude of the electromagnetic force and the time phase of the electromagnetic force;
the control system includes: the system comprises an exhaust pressure signal detection system, an excitation coil power supply system, a weighing sensor system and a motor shaft phase detection system; the control system controls and adjusts a periodic variation curve of electromagnetic force to enable the periodic variation curve of the electromagnetic force to be synchronously changed with a curve of axial gas separation force of the movable scroll and the fixed scroll, so that a PV value between the movable scroll and the fixed scroll is not more than 10mpa x m/s, wherein the PV value is a product of contact stress between the movable scroll and the fixed scroll and a linear speed of mutual movement between the movable scroll and the fixed scroll.
5. A scroll fluid displacement device with floating electromagnetic mechanism according to claim 4, wherein the combined force of the electromagnetic attraction force and/or the electromagnetic repulsion force and the auxiliary force is capable of overcoming the axial separation force generated by the gas pressure in the gas chamber and the high pressure region and the low pressure region to maintain the contact seal between the movable scroll and the fixed scroll, wherein the auxiliary force is a spring force, an elastic force of an elastic material, an elastic force of an elastic structure, and/or a fluid pressure.
6. The scroll fluid displacement device with floating electromagnetic mechanism of claim 5, wherein the magnetic circuit ring and the suction plate are made of magnetically permeable material and/or permanent magnetic material.
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| CN112554955B (en) * | 2020-11-26 | 2022-06-28 | 思科涡旋科技(杭州)有限公司 | Floating vortex device sealed by magnetic force |
| CN113606134B (en) * | 2021-06-11 | 2023-03-28 | 浙江科技学院 | Optimization control method for electromagnetic axial dynamic sealing of scroll machine |
| CN114033671B (en) * | 2021-11-09 | 2023-08-08 | 中国人民解放军火箭军工程大学 | Semi-contact type end face gap compensation device and method for circular arc spiral gear pump |
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