WO2017141322A1 - 圧縮機及び冷凍サイクル装置 - Google Patents
圧縮機及び冷凍サイクル装置 Download PDFInfo
- Publication number
- WO2017141322A1 WO2017141322A1 PCT/JP2016/054308 JP2016054308W WO2017141322A1 WO 2017141322 A1 WO2017141322 A1 WO 2017141322A1 JP 2016054308 W JP2016054308 W JP 2016054308W WO 2017141322 A1 WO2017141322 A1 WO 2017141322A1
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- WIPO (PCT)
- Prior art keywords
- liquid level
- crankshaft
- electrode
- container
- level sensor
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/02—Lubrication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/121—Casings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/10—Other safety measures
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- 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
- F04C29/02—Lubrication; Lubricant separation
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- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
- G01F23/241—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid for discrete levels
- G01F23/242—Mounting arrangements for electrodes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2205/00—Fluid parameters
Definitions
- the present invention relates to a compressor and a refrigeration cycle apparatus.
- a capacitive liquid level detector is formed so that a sensor for detecting the liquid level of the mixed liquid is formed at the top and a sensor for detecting the mixing ratio of the refrigerating machine oil and the refrigerant is formed at the bottom.
- a sensor for detecting the liquid level of the mixed liquid is formed at the top and a sensor for detecting the mixing ratio of the refrigerating machine oil and the refrigerant is formed at the bottom.
- the liquid level detector depending on the arrangement of other structural parts in the sealed container, it may be difficult to arrange the liquid level detector.
- the upper part of the liquid level detector needs to be arranged over the range of the liquid level to be detected. There is a possibility that a space for arranging the lower part of the liquid level detector cannot be secured.
- An object of the present invention is to prevent damage to a liquid level sensor due to the action of fluid force caused by a mixture of refrigeration oil and refrigerant in a container in a compressor.
- a compressor according to an aspect of the present invention is provided.
- the liquid level sensor is installed at a position and posture that is not easily affected by the fluid force caused by the mixture of the refrigerating machine oil and the refrigerant in the container. Damage to the liquid level sensor can be prevented.
- FIG. 1 is a circuit diagram of a refrigeration cycle apparatus according to Embodiment 1.
- FIG. 1 is a circuit diagram of a refrigeration cycle apparatus according to Embodiment 1.
- FIG. 1 is a longitudinal sectional view of a compressor according to Embodiment 1.
- FIG. 2 is a perspective view of a liquid level sensor of the compressor according to Embodiment 1.
- FIG. 3 is a cross-sectional view showing the arrangement of the liquid level sensor of the compressor according to the first embodiment. The figure which shows the relationship between arrangement
- FIG. 1 is a circuit diagram of a refrigeration cycle apparatus according to Embodiment 1.
- FIG. 1 is a longitudinal sectional view of a compressor according to Embodiment 1.
- FIG. 2 is a perspective view of a liquid level
- FIG. 6 is a cross-sectional view showing the arrangement of the liquid level sensor of the compressor according to a modification of the first embodiment.
- FIG. FIG. 6 is a partial perspective view of a liquid level sensor of a compressor according to a third embodiment.
- FIG. 6 is a cross-sectional view showing the arrangement of liquid level sensors of a compressor according to Embodiment 3.
- FIG. 6 is a perspective view of a liquid level sensor of a compressor according to a fourth embodiment.
- FIG. 10 is a cross-sectional view showing the arrangement of the liquid level sensor of the compressor according to the fourth embodiment.
- Embodiment 1 FIG. *** Explanation of configuration *** With reference to FIG.1 and FIG.2, the structure of the refrigerating-cycle apparatus 10 which concerns on this Embodiment is demonstrated.
- FIG. 1 shows the refrigerant circuit 11 during the cooling operation.
- FIG. 2 shows the refrigerant circuit 11 during heating operation.
- the refrigeration cycle apparatus 10 is an air conditioner in the present embodiment, but may be an apparatus other than an air conditioner such as a refrigerator or a heat pump cycle apparatus.
- the refrigeration cycle apparatus 10 includes a refrigerant circuit 11 in which a refrigerant circulates.
- the refrigeration cycle apparatus 10 further includes a compressor 12, a four-way valve 13, a first heat exchanger 14 that is an outdoor heat exchanger, an expansion mechanism 15 that is an expansion valve, and a second heat that is an indoor heat exchanger. And an exchanger 16.
- the compressor 12, the four-way valve 13, the first heat exchanger 14, the expansion mechanism 15, and the second heat exchanger 16 are connected to the refrigerant circuit 11.
- Compressor 12 compresses the refrigerant.
- the four-way valve 13 switches the direction in which the refrigerant flows between the cooling operation and the heating operation.
- the first heat exchanger 14 operates as a condenser during the cooling operation, and dissipates the refrigerant compressed by the compressor 12. That is, the first heat exchanger 14 performs heat exchange using the refrigerant compressed by the compressor 12.
- the first heat exchanger 14 operates as an evaporator during the heating operation, and heats the refrigerant by exchanging heat between the outdoor air and the refrigerant expanded by the expansion mechanism 15.
- the expansion mechanism 15 expands the refrigerant radiated by the condenser.
- the second heat exchanger 16 operates as a condenser during the heating operation, and dissipates heat from the refrigerant compressed by the compressor 12. That is, the second heat exchanger 16 performs heat exchange using the refrigerant compressed by the compressor 12.
- the second heat exchanger 16 operates as an evaporator during the cooling operation, and heats the refrigerant by exchanging heat between the indoor air and the refrigerant expanded by the expansion mechanism 15.
- the refrigeration cycle apparatus 10 further includes a controller 17.
- the controller 17 is a microcomputer. 1 and 2 show only the connection between the controller 17 and the compressor 12, the controller 17 is connected not only to the compressor 12 but also to elements other than the compressor 12 connected to the refrigerant circuit 11. Also good.
- the controller 17 monitors and controls the state of the connected element.
- HFC HydroFluoroCarbon refrigerants
- R32, R125, R134a, R407C, and R410A HFC refrigerants
- HFO HydroFluoroOlefin refrigerants
- R1123, R1132 (E), R1132 (Z), R1132a, R1141, R1234yf, R1234ze (E), R1234ze (Z) are used.
- natural refrigerants such as R290 (propane), R600a (isobutane), R744 (carbon dioxide), R717 (ammonia) are used.
- other refrigerants are used.
- a mixture of two or more of these refrigerants is used.
- the compressor 12 is a hermetic compressor in the present embodiment.
- the compressor 12 is specifically a scroll compressor, but may be a rotary compressor or a reciprocating compressor.
- the compressor 12 includes a container 21, a compression mechanism 22, an electric motor 23, a crankshaft 24, a first bearing 26, a second bearing 27, and a liquid level sensor 30.
- the container 21 is specifically a sealed container.
- a liquid mixture 25 of refrigerating machine oil and refrigerant is stored at the bottom of the container 21.
- the container 21 is provided with a suction pipe 41 for sucking refrigerant and a discharge pipe 42 for discharging refrigerant.
- the compression mechanism 22 is accommodated in the container 21. Specifically, the compression mechanism 22 is installed on the inner upper side of the container 21.
- the electric motor 23 is also accommodated in the container 21. Specifically, the electric motor 23 is installed inside the container 21 below the compression mechanism 22 and above the bottom of the container 21. In the present embodiment, the electric motor 23 is an induction motor, but may be a motor other than the induction motor, such as a brushless DC (Direct Current) motor.
- a brushless DC (Direct Current) motor such as a brushless DC (Direct Current) motor.
- the compression mechanism 22 and the electric motor 23 are connected by a crankshaft 24.
- the crankshaft 24 is a rotating shaft of the electric motor 23, and is also an oil supply mechanism 28 that supplies the refrigeration oil contained in the mixed liquid 25 to each sliding portion of the compression mechanism 22. That is, the crankshaft 24 pumps the liquid mixture 25 from the bottom of the container 21 during rotation.
- the refrigerating machine oil contained in the mixed liquid 25 is supplied to each sliding portion of the compression mechanism 22 through the inside of the crankshaft 24 by a differential pressure oil supply method, and each sliding portion of the compression mechanism 22 is supplied.
- Lubricate As the refrigerating machine oil, synthetic oils such as POE (polyol ester), PVE (polyvinyl ether), and AB (alkylbenzene) are used.
- a suction part 29 for sucking the mixed liquid 25 from the opening is provided.
- the suction part 29 is an oil pipe.
- an oil pump is unnecessary because the differential pressure oil supply method is adopted.
- an oil pump is provided below the crankshaft 24 as the suction portion 29 and an oil supply method using the oil pump is adopted. Good.
- the refrigerating machine oil contained in the mixed liquid 25 is pumped up by the oil pump as the crankshaft 24 rotates and supplied to the sliding portions of the compression mechanism 22. Lubricate the part.
- the compression mechanism 22 is driven by the rotational force of the electric motor 23 transmitted via the crankshaft 24 to compress the refrigerant. Specifically, this refrigerant is a low-pressure gas refrigerant sucked into the suction pipe 41.
- the high-temperature and high-pressure gas refrigerant compressed by the compression mechanism 22 is discharged from the compression mechanism 22 into the container 21.
- the gas refrigerant discharged from the compression mechanism 22 is discharged from the space in the container 21 through the discharge pipe 42 to the external refrigerant circuit 11.
- the first bearing 26 is fitted to the crankshaft 24 at a position above the electric motor 23, and supports the crankshaft 24 in a freely rotatable manner.
- An oil film is formed between the first bearing 26 and the crankshaft 24 by supplying refrigeration oil contained in the mixed liquid 25 pumped into the crankshaft 24 that is the oil supply mechanism 28.
- the second bearing 27 is fitted to the crankshaft 24 at a position below the electric motor 23, and supports the crankshaft 24 in a freely rotatable manner.
- An oil film is formed between the second bearing 27 and the crankshaft 24 by supplying the refrigeration oil contained in the mixed liquid 25 pumped into the crankshaft 24 that is the oil supply mechanism 28.
- the liquid level sensor 30 is installed at a position where a minimum liquid level that can be supplied by the oil supply mechanism 28 can be detected.
- One end of a lead wire 31 is connected to the liquid level sensor 30.
- the other end of the lead wire 31 is connected to a terminal 32 fixed to the container 21 by welding.
- the terminal 32 is connected to the controller 17 outside the container 21 by a wiring 33.
- the controller 17 detects the state of the liquid level sensor 30 as an electrical signal through the lead wire 31, the terminal 32, and the wiring 33 in order, so that whether or not the liquid level of the mixed liquid 25 has reached the reference height. Is detected.
- the controller 17 controls the operation of the compressor 12 according to the detection result, that is, whether or not the liquid level of the mixed liquid 25 has reached the reference height.
- the liquid level sensor 30 has a longitudinal electrode 34 to which one end of the lead wire 31 described above is connected.
- a pair of rectangular plate-like electrodes 34 are provided as the electrodes 34 so that their plate surfaces face each other.
- the liquid level sensor 30 further includes a pair of insulators 35.
- One insulator 35 fixes one end of both electrodes 34 in the longitudinal direction so as to be spaced apart from each other.
- the other insulator 35 fixes the other end portions of both electrodes 34 in the longitudinal direction so as to be spaced apart from each other.
- the liquid level sensor 30 is installed at one place on the inner wall of the container 21. Although the liquid level sensor 30 may be directly attached to the inner wall of the container 21, in this embodiment, the inner wall of the container 21 is interposed via a plate-like fixing member 43 that is bent in accordance with the shape of the inner wall of the container 21. It is fixed to.
- Both ends in the longitudinal direction of the electrode 34 are located at different positions in the rotation direction of the crankshaft 24. That is, when the center Z of the electrode 34 is located at 0 degree in a concentric circle centered on the central axis of the crankshaft 24, the point X at one end in the longitudinal direction of the electrode 34 is an angle smaller than 0 degree.
- the point Y at the other end in the longitudinal direction of the electrode 34 is at an angle greater than 0 degrees. That is, in a plan view, a perpendicular line from the point X at one end in the longitudinal direction of the electrode 34 to the central axis of the crankshaft 24 and a point Y at the other end in the longitudinal direction of the electrode 34 to the central axis of the crankshaft 24.
- the angle ⁇ formed with the perpendicular is greater than 0 degrees.
- the liquid level sensor 30 is arranged so that the distances from the longitudinal ends of the electrode 34 to the central axis of the crankshaft 24 are equal. That is, the liquid level sensor 30 is arranged so that the longitudinal direction of the electrode 34 is perpendicular to the perpendicular line from the center Z of the electrode 34 to the center axis of the crankshaft 24.
- the liquid level sensor 30 has a straight line connecting points X and Y at both ends in the longitudinal direction of the electrode 34 in contact with a circle centered on the central axis of the crankshaft 24, and the contact point is the electrode. It is arranged so as to coincide with the center Z of 34.
- the liquid level sensor 30 is arranged so that the longitudinal direction of the electrode 34 is orthogonal to the axial direction of the crankshaft 24.
- the electrode 34 since the electrode 34 has a rectangular plate shape, the short side direction of the electrode 34 coincides with the axial direction of the crankshaft 24.
- the liquid level sensor 30 may be installed in the vicinity of the center axis of the crankshaft 24 or in the vicinity of the center axis between the crankshaft 24 and the inner wall of the container 21, but in the present embodiment, as shown in FIG. In addition, it is installed on the inner wall of the container 21. Therefore, the effect that it is easy to ensure the arrangement space for other structural components in the container 21 is obtained.
- the longitudinal direction of the electrode 34 is orthogonal to the perpendicular line from the center Z of the electrode 34 to the central axis of the crankshaft 24, and the orientation of the electrode 34 is mixed. It becomes almost parallel to the flow of the liquid 25. Therefore, the effect that the liquid level sensor 30 becomes less susceptible to the fluid force by the liquid mixture 25 is enhanced. The effect that the liquid level sensor 30 does not easily obstruct the flow of the mixed liquid 25 is also enhanced.
- the longitudinal direction of the electrode 34 is orthogonal to the axial direction of the crankshaft 24, and the vertical dimension of the electrode 34 is small. Therefore, the effect that the liquid level sensor 30 becomes less susceptible to the influence of the fluid force by the liquid mixture 25 is further enhanced. The effect that the liquid level sensor 30 does not easily obstruct the flow of the mixed liquid 25 is further enhanced. Since the space occupied by the electrode 34 in the vertical direction is small, an effect that the liquid level sensor 30 can be easily arranged can be obtained. The dimension of the electrode 34 in the vertical direction is only required to be a minimum size for securing the surface area necessary for detecting the liquid level of the mixed liquid 25.
- a pair of longitudinal electrodes 34 face each other in the radial direction of the crankshaft. As shown in FIG. 6, the lower end of each electrode 34 is at a position higher than the opening of the suction portion 29. That is, the electrode 34 is disposed at a position higher than the liquid level where the oil supply mechanism 28 cannot supply oil.
- liquid level of the liquid mixture 25 is normally within the range of the liquid level.
- the liquid level sensor 30 is completely immersed in the liquid mixture 25.
- the liquid level of the mixed liquid 25 is normally within the range of the liquid level.
- a part of the liquid level sensor 30 is immersed in the liquid mixture 25.
- the liquid level of the mixed liquid 25 is within the range of the alert liquid level.
- the liquid level sensor 30 is not immersed in the liquid mixture 25, but the suction part 29 is barely immersed in the liquid mixture 25.
- the liquid level of the liquid mixture 25 is within the range of the liquid level that cannot be refueled. Since neither the liquid level sensor 30 nor the suction part 29 is immersed in the liquid mixture 25, oil supply by the oil supply mechanism 28 is impossible.
- the controller 17 measures the capacitance between the pair of electrodes 34 via the lead wire 31, the terminal 32 and the wiring 33.
- the controller 17 detects the state of the liquid level of the liquid mixture 25 from the measured capacitance.
- the controller 17 increases the operating frequency of the compressor 12 so that the refrigeration oil returns from the refrigerant circuit 11 to the container 21, or stops the operation of the compressor 12.
- the controller 17 returns the operation frequency of the compressor 12 to the normal operation frequency when the state S2 is detected.
- the liquid level sensor 30 is installed at a position and posture that is not easily affected by the fluid force of the mixed liquid 25 of the refrigerating machine oil and the refrigerant in the container 21 in the compressor 12, Damage to the liquid level sensor 30 due to the influence of physical strength can be prevented. Specifically, since the liquid level sensor 30 is disposed substantially in parallel with the flow of the mixed liquid 25, the electrode 34 of the liquid level sensor 30 can be prevented from being damaged by the fluid force of the mixed liquid 25. Therefore, the reliability of the compressor 12 can be improved.
- the present embodiment it is possible to prevent the liquid level of the mixed liquid 25 from becoming a liquid level that cannot be supplied by the oil supply mechanism 28. Therefore, the reliability of the compressor 12 can be improved.
- the liquid level sensor 30 is installed at a position where the liquid level of the mixed liquid 25 in the container 21 is the minimum liquid level that can guarantee the reliability of the compressor 12,
- the size of the liquid level sensor 30 in the height direction of the compressor 12 can be made smaller than the conventional one.
- the liquid level sensor 30 is installed at one place on the inner wall of the container 21, but as a modification, the liquid level sensor 30 is arranged in the rotational direction of the crankshaft 24. It may be installed at two or more locations on the inner wall of the container 21. About this modification, the difference with this Embodiment is mainly demonstrated.
- the liquid level sensor 30 is installed at three locations on the inner wall of the container 21.
- the liquid level sensor 30 may be directly attached to the inner wall of the container 21, but in this modification, the liquid level sensor 30 is attached to the inner wall of the container 21 via a plate-like fixing member 43 that is bent in accordance with the shape of the inner wall of the container 21. It is fixed.
- liquid level sensor 30 should just be installed in at least 1 place of the inner wall of the container 21, and may be installed in 2 places or 4 places or more of the inner wall of the container 21.
- Embodiment 2 FIG. In the present embodiment, differences from the first embodiment will be mainly described.
- the compressor 12 further includes a plate 36.
- the plate 36 is installed inside the container 21 and separates the space in which the electric motor 23 is stored in the axial direction of the crankshaft 24 from the space in which the liquid level sensor 30 is installed.
- the plate 36 has a circular plate shape with a through hole provided in the center, and is fitted to the crankshaft 24 so as to contact the lower surface of the second bearing 27 at a position higher than the liquid level sensor 30. .
- the liquid level operation of the mixed liquid 25 in the container 21 due to the influence of the electric motor 23 can be moderated by the plate 36. That is, the liquid level of the mixed liquid 25 of the refrigerating machine oil and the refrigerant in the container 21 can be stabilized. Therefore, the detection error of the liquid level due to the fluctuation of the liquid level can be reduced. That is, the accuracy of detection of the liquid level by the liquid level sensor 30 can be improved.
- the liquid level sensor 30 is installed at one place on the inner wall of the container 21 as in the first embodiment.
- the liquid level sensor 30 is provided. May be installed at two or more locations on the inner wall of the container 21 in the rotation direction of the crankshaft 24.
- Embodiment 3 FIG. In the present embodiment, differences from the first embodiment will be mainly described.
- the liquid level sensor 30 has a longitudinal electrode 34 as in the first embodiment, but the electrode 34 is not a rectangular plate shape as in the first embodiment, but a cylindrical shape having both ends in the longitudinal direction opened. It is. In the present embodiment, a pair of cylindrical electrodes 34 are provided as the electrodes 34 such that one inner peripheral surface and the other outer peripheral surface face each other.
- the liquid level sensor 30 further includes a pair of insulators 35 as in the first embodiment. One insulator 35 fixes one end of both electrodes 34 in the longitudinal direction so as to be spaced apart from each other. Although not shown, the other insulator 35 fixes the other end portions of both electrodes 34 in the longitudinal direction so as to be spaced from each other.
- the liquid level sensor 30 is installed at one place on the inner wall of the container 21.
- the liquid level sensor 30 may be directly attached to the inner wall of the container 21, but also in the present embodiment, the inner wall of the container 21 via the plate-shaped fixing member 43 that is bent according to the shape of the inner wall of the container 21. It is fixed to.
- the liquid level sensor 30 is arranged so that the longitudinal direction of the electrode 34 is orthogonal to the perpendicular line from the center Z of the electrode 34 to the central axis of the crankshaft 24.
- the liquid level sensor 30 is arranged so that the longitudinal direction of the electrode 34 is orthogonal to the axial direction of the crankshaft 24.
- the same surface area can be secured with the electrode 34 having a smaller size than the rectangular plate-like electrode 34 as in the first embodiment.
- the space required for the arrangement of the liquid level sensor 30 can be reduced. Therefore, the arrangement of the liquid level sensor 30 is facilitated.
- the liquid level sensor 30 is installed at one place on the inner wall of the container 21 as in the first embodiment. However, as in the modification of the first embodiment, the liquid level sensor 30 is provided. May be installed at two or more locations on the inner wall of the container 21 in the rotation direction of the crankshaft 24. Further, the compressor 12 may include a plate 36 similar to that of the second embodiment.
- Embodiment 4 FIG. In the present embodiment, differences from the first embodiment will be mainly described.
- the liquid level sensor 30 has a longitudinal electrode 34 as in the first embodiment, but the electrode 34 is curved in an arc shape in plan view. In the present embodiment, a pair of curved plate-like electrodes 34 are provided as the electrodes 34 so that their plate surfaces face each other.
- the liquid level sensor 30 further includes a pair of insulators 35 as in the first embodiment. One insulator 35 fixes one end of both electrodes 34 in the longitudinal direction so as to be spaced apart from each other. The other insulator 35 fixes the other end portions of both electrodes 34 in the longitudinal direction so as to be spaced apart from each other.
- the liquid level sensor 30 is installed at one place on the inner wall of the container 21.
- the liquid level sensor 30 may be directly attached to the inner wall of the container 21, but also in the present embodiment, the inner wall of the container 21 via the plate-shaped fixing member 43 that is bent according to the shape of the inner wall of the container 21. It is fixed to.
- the liquid level sensor 30 is arranged so that the longitudinal direction of the electrode 34 is orthogonal to the perpendicular line from the center Z of the electrode 34 to the central axis of the crankshaft 24.
- the liquid level sensor 30 is arranged so that the longitudinal direction of the electrode 34 is orthogonal to the axial direction of the crankshaft 24.
- the electrode 34 is curved in an arc shape along the rotation direction of the crankshaft 24.
- the liquid level sensor 30 can be disposed along the inner wall of the container 21, and the liquid level sensor 30 has a shape that substantially matches the flow of the mixed liquid 25. It is possible to prevent the electrode 34 of the liquid level sensor 30 from being damaged by physical strength. Therefore, the reliability of the compressor 12 can be improved.
- the liquid level sensor 30 can be arranged along the inner wall of the container 21, the liquid level sensor 30 is unlikely to interfere with other components. Therefore, the arrangement of the liquid level sensor 30 is facilitated.
- the liquid level sensor 30 is installed at one place on the inner wall of the container 21 as in the first embodiment. However, as in the modification of the first embodiment, the liquid level sensor 30 is provided. May be installed at two or more locations on the inner wall of the container 21 in the rotation direction of the crankshaft 24. Further, the compressor 12 may include a plate 36 similar to that of the second embodiment.
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- Physics & Mathematics (AREA)
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- General Physics & Mathematics (AREA)
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Abstract
Description
底部に冷凍機油と冷媒との混合液が貯留された容器と、
前記容器に収納された電動機と、
前記電動機の回転軸であり、回転中に前記容器の底部から前記混合液を汲み上げるクランク軸と、
前記混合液の液面が基準の高さに達しているかどうかを検出するための長手状の電極を有し、前記電極の長手方向の両端が前記クランク軸の回転方向において互いに異なる位置にある液面センサとを備える。
***構成の説明***
図1及び図2を参照して、本実施の形態に係る冷凍サイクル装置10の構成を説明する。
図6及び図7を参照して、コントローラ17の動作を説明する。
本実施の形態によれば、圧縮機12において容器21内の冷凍機油と冷媒との混合液25による流体力の影響を受けにくい位置及び姿勢にて液面センサ30が設置されるため、その流体力の影響に起因する液面センサ30の破損を防止することができる。具体的には、液面センサ30が、混合液25の流れとほぼ平行に配置されているため、混合液25の流体力による液面センサ30の電極34の破損を防止することができる。よって、圧縮機12の信頼性を向上させることができる。
本実施の形態では、図5に示したように、液面センサ30が、容器21の内壁の1箇所に設置されるが、変形例として、液面センサ30は、クランク軸24の回転方向において容器21の内壁の2箇所以上に設置されてもよい。この変形例について、主に本実施の形態との差異を説明する。
本実施の形態について、主に実施の形態1との差異を説明する。
本実施の形態について、主に実施の形態1との差異を説明する。
本実施の形態について、主に実施の形態1との差異を説明する。
Claims (11)
- 底部に冷凍機油と冷媒との混合液が貯留された容器と、
前記容器に収納された電動機と、
前記電動機の回転軸であり、回転中に前記容器の底部から前記混合液を汲み上げるクランク軸と、
前記混合液の液面が基準の高さに達しているかどうかを検出するための長手状の電極を有し、前記電極の長手方向の両端が前記クランク軸の回転方向において互いに異なる位置にある液面センサと
を備える圧縮機。 - 前記電極の長手方向が前記電極の中心から前記クランク軸の中心軸への垂線に直交している請求項1に記載の圧縮機。
- 前記電極の長手方向が前記クランク軸の軸方向に直交している請求項1又は2に記載の圧縮機。
- 前記電極は、短辺方向が前記クランク軸の軸方向と一致する矩形板状である請求項1から3のいずれか1項に記載の圧縮機。
- 前記電極は、長手方向の両端が開口された円筒状である請求項1から3のいずれか1項に記載の圧縮機。
- 前記電極は、前記クランク軸の回転方向に沿って円弧状に湾曲している請求項1から5のいずれか1項に記載の圧縮機。
- 前記クランク軸の下部には、前記混合液を開口から吸入する吸入部が設けられ、
前記液面センサは、前記電極として、前記クランク軸の径方向において互いに対向し、それぞれの下端が前記吸入部の開口よりも高い位置にある1対の長手状の電極を有する請求項1から6のいずれか1項に記載の圧縮機。 - 前記容器の内部に設置され、前記クランク軸の軸方向において前記電動機が収納された空間と前記液面センサが設置された空間とを隔てるプレート
をさらに備える請求項1から7のいずれか1項に記載の圧縮機。 - 前記液面センサは、前記容器の内壁の少なくとも1箇所に設置されている請求項1から8のいずれか1項に記載の圧縮機。
- 前記液面センサは、前記クランク軸の回転方向において前記容器の内壁の2箇所以上に設置されている請求項1から8のいずれか1項に記載の圧縮機。
- 請求項1から10のいずれか1項に記載の圧縮機と、
前記液面センサを用いて前記混合液の液面が前記基準の高さに達しているかどうかを検出し、検出結果によって前記圧縮機の運転を制御するコントローラと
を備える冷凍サイクル装置。
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CZ2018366A CZ308987B6 (cs) | 2016-02-15 | 2016-02-15 | Kompresor a zařízení chladicího cyklu |
CN201680072660.8A CN108700054B (zh) | 2016-02-15 | 2016-02-15 | 压缩机及制冷循环装置 |
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JP2020148105A (ja) * | 2019-03-11 | 2020-09-17 | 三菱重工サーマルシステムズ株式会社 | オイルセンサユニット、及び圧縮機 |
JP2021056134A (ja) * | 2019-09-30 | 2021-04-08 | ダイキン工業株式会社 | 容器 |
US20220127507A1 (en) * | 2019-02-11 | 2022-04-28 | Mexichem Fluor S.A. De C.V. | Compositions |
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CZ308987B6 (cs) | 2021-11-10 |
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