JP2010053779A - Hermetic compressor and refrigerating cycle device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic compressor capable of improving oil level detection accuracy, even if a communicating tube is used for detecting an oil level. <P>SOLUTION: The hermetic compressor 4a has the oil level detecting communicating tube 41a on a side surface of a sealed vessel, for storing an electric motor part 4Aa in an upper part in the sealed vessel 40a for storing refrigerating machine oil in a bottom part, and storing an electric motor part and a compression mechanism part 4Ba connected via a rotary shaft in a lower part in the sealed vessel, and has a preventive means for preventing the refrigerating machine oil flowing down on an inner wall surface of the sealed vessel and the refrigerating machine oil splashed by being mixed in a refrigerant from being directly introduced to an opening part of the communicating tube. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hermetic compressor and a refrigeration cycle apparatus using the same, and more particularly to a hermetic compressor having an improved mounting structure of a communication pipe for detecting the oil level of refrigeration oil and a refrigeration cycle apparatus using the same.

  Conventionally, a high pressure type hermetic compressor is covered with a hermetic container, and the hermetic container is filled with refrigerating machine oil. A part of the refrigerating machine oil flows out into the refrigerating cycle together with the refrigerant as the compressor sucks and discharges the refrigerant, so that there may be a shortage of lubricating oil in the compressor.

  Therefore, a communication pipe for detecting the oil level is connected to the side surface of the sealed container, and the oil level is detected using this communication pipe, and when the oil level is detected, the refrigerating machine oil is supplied from the refrigeration cycle. Control is performed to accurately detect the oil level without using a mechanical switch (see, for example, Patent Document 1).

  However, in the compressor described in Patent Document 1, since the communication pipe is arranged at the same height as the cylinder upper surface, a time lag may occur, and if this time lag is large, the oil supply is not in time and falls below the limit oil level. There was a thing.

  In addition, the stator outer circumferential notch is located vertically above the opening of the communication pipe, and the opening of the communication pipe faces the horizontal direction and the compressor central axis, and the exhaust gas outlet of the muffler is around the compressor central axis. It is provided on a ring and no consideration is given to separating it from the communication pipe as much as possible. Also, no cover or the like is provided around the opening of the communication pipe.

  Furthermore, the atmosphere in the motor lower space above the cylinder is caused by the rotating flow caused by the rotor rotation, the discharge gas from the muffler outlet, etc., and the refrigerating machine oil separated from the refrigerant in the motor upper space falls through the stator outer notch. Therefore, particularly during high-Hz operation, the turbulent flow state is a mixture of refrigerant and oil, and it may be difficult to distinguish the oil level.

On the other hand, in the space below the cylinder, the cylinder itself becomes a wall, and the oil level is relatively more stable than on the cylinder.
JP 2002-242833 A

  The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a hermetic compressor capable of improving the oil level detection accuracy even when a communication pipe is used for oil level detection.

  It is another object of the present invention to provide a refrigeration cycle apparatus using a hermetic compressor that can improve oil level detection accuracy even when a communication pipe is used for oil level detection.

  In order to achieve the above-described object, a hermetic compressor according to the present invention houses an electric motor part in an upper part of a closed container storing refrigeration oil at the bottom, and rotates with the electric motor part in a lower part of the closed container. A refrigerating machine oil and a refrigerant that flow down the inner wall surface of the hermetic container in a hermetic compressor that houses a compression mechanism unit connected via a shaft and has a communication pipe for detecting oil level connected to a side surface of the hermetic container Refrigerator oil mixed and scattered is provided with a preventing means for preventing the refrigerating machine oil from being guided directly to the opening of the communication pipe.

  Moreover, the refrigeration cycle apparatus according to the present invention uses the above-described hermetic compressor.

  According to the hermetic compressor according to the present invention, it is possible to provide a hermetic compressor capable of improving the oil level detection accuracy even if a communication pipe is used for oil level detection.

  Further, according to the refrigeration cycle apparatus using the hermetic compressor according to the present invention, the refrigeration using the hermetic compressor that can improve the oil level detection accuracy even if the communication pipe is used for the oil level detection. A cycle device can be provided.

  A hermetic compressor and a refrigeration cycle apparatus using the same according to a first embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a conceptual diagram of a refrigeration cycle apparatus using a hermetic compressor according to a first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the hermetic compressor according to the first embodiment of the present invention. .

  As shown in FIG. 1, an air conditioner A in which the refrigeration cycle apparatus 1 according to this embodiment is incorporated includes an outdoor unit 2 and an indoor unit 3 connected to each other.

  The outdoor unit 2 includes two compressors 4a and 4b having the same structure connected in parallel, an oil separator 7, a four-way valve 9, an outdoor heat exchanger 10, an accumulator 16, an outdoor fan 20, and the like. The unit 3 includes an electronic expansion valve 13, an indoor heat exchanger 14, an indoor fan 30, and the like. Furthermore, the indoor unit 2 and the outdoor unit 3 are connected by a liquid pipe 12 and a gas pipe 15. .

  FIG. 2 is a longitudinal sectional view of one compressor 4a. Since the compressors 4a and 4b have the same structure, the description of the other compressor 4b is omitted.

As shown in FIG. 2, the compressor 4a is a twin type rotary compressor, driven by a variable rotational speed by an inverter device (not shown), it comprises a sealed container 40a, the refrigerating machine oil in the bottom part 40a ₁ The motor part 4Aa is housed in the upper part of the reservoir, and the motor part 4Aa and the compression mechanism part 4Ba connected via the rotating shaft 4Ca are housed in the lower part of the sealed container 40a.

  Further, the discharge pipe 5 a is connected to the refrigerant discharge port of the compressor 4 a, and the discharge pipe 5 a is connected to the high-pressure side pipe 6.

  The discharge pipes 5a and 5b are provided with check valves 51a and 51b. Further, suction pipes 18a and 18b are connected to the refrigerant suction ports of the compressors 4a and 4b, these suction pipes 18a and 18b are connected to the low-pressure side pipe 17, and suction cups 19a and 19b are connected to the suction pipes 18a and 18b. Connected.

At a predetermined height position of the sealed container 40a of the compressor 4a, one end portion 41a ₁ having an opening 41a ₂ of the communication pipe 41a for detecting the oil level is connected.

Communicating pipe 41a extends downward from above, bent in the middle, one end portion 41a ₁ is the opening area is formed smaller than the opening area of the communicating pipe 41a.

Further, one end portion 41a ₁ is, and the lower end of the stator 41Aa ₁ of the motor portion 4Aa of the compressor 4a, located between the cylinder 4Ba ₁ compression mechanism 4Ba driven by an electric motor unit 4Aa, opening 41a ₂ Is opened.

Further, opposite to the opening 41a _2, and closely spaced, the cover member 21a as prevention means for preventing the refrigerating machine oil is introduced directly provided is fixed to the sealed container 40a.

As shown in FIG. 3, the cover member 21a has a rectangular shape when viewed from the front, and the front surface and the back surface are substantially rectangular parallelepiped shapes having the same curvature as the curvature of the sealed container 40a. As indicated by the dotted line and the shaded area, a substantially rectangular parallelepiped space portion 21a ₁ having an open left side and a bottom portion is formed. An opening 41a ₂ is opened to face the space 21a ₁ . The cover member 21a is positioned just below the outer periphery notch 4Aa ₃ stator end 4Aa ₁ (FIG. 2).

Right and upper side in the drawing the cover member 21a is closed, most of the left side and the lower side is open and faces the flow of the refrigerant caused by the rotation of the rotor 4Aa _2, blocking the flow of the opening 41a ₂ of the refrigerant To do.

  A guide tube 48a is fixed in the vicinity of the end of the communication tube 41a, the communication tube 41a is reinforced, and there is no problem even if a force is applied to the communication tube 41a during conveyance or sealing.

Again, as shown in FIG. 1, check valves 42a and 42b and first decompression means such as capillary tubes 43a and 43b are provided in the direction of oil outflow of the communication tubes 41a and 41b. The opening area of the opening 41a ₂ (FIG. 2) is larger than the opening areas of the capillary tubes 43a and 43b. Thus, the opening 41a ₂ becomes resistance is avoided, thereby improving the flow properties of the oil into the oil equalizing circuit.

  First temperature detection sensors T1a and T1b are provided on the downstream side of the capillary tubes 43a and 43b. The other end of the communication pipes 41 a and 41 b is connected to an oil tank 60 that also functions as a gas-liquid separation, and the communication pipes 41 a and 41 b are assembled in the oil tank 60. The oil tank 60 temporarily stores excess refrigeration oil flowing from the communication pipes 41a and 41b, and separates gas and liquid. An oil equalizing pipe 45 is connected to a predetermined height of the oil tank 60, and a second temperature detection sensor T2 is provided near the oil tank 60 of the oil equalizing pipe 45. The oil equalizing pipe 45 is branched into oil equalizing distribution pipes 45a and 45b on the way, and the oil equalizing distribution pipes 45a and 45b are connected to the suction pipes 18a and 18b. The oil equalizing distribution pipes 45a and 45b are respectively provided with second decompression means, for example, capillary tubes 46a and 46b.

  Further, a bypass pipe 47 is connected between the oil tank 60 and the high-pressure side pipe 6. The bypass pipe 47 is provided with third decompression means, for example, a capillary tube 48, and a third temperature detection sensor T3 is provided downstream of the capillary tube 48.

  The resistances of the capillary tubes 43a and 43b as the first pressure reducing means are provided larger than the resistances of the capillary tubes 46a and 46b as the second pressure reducing means. Thereby, the refrigerating machine oil in the oil tank 60 is pulled from the first communication pipes 41a and 41b to the oil equalizing distribution pipes 45a and 45b and does not flow backward.

  Further, oil return pipes 71 and 72 are connected in parallel between the oil separator 7 and the oil equalizing pipe 45. One end of the oil return pipe 71 is connected to a predetermined height position of the oil separator 7, and a capillary tube 73 is provided. The refrigerating machine oil in the oil separator 7 accumulated above the connection position of the oil return pipe 71 flows into the oil return pipe 71 and flows into the oil equalizing pipe 45 through the capillary tube 74. The lubricating oil flowing into the oil equalizing pipe 45 is divided into oil equalizing distribution pipes 45a and 45b, flows into the suction pipes 18a and 18b via the capillary tubes 46a and 46b, and together with the refrigerant circulated through the refrigeration cycle, the compressor 4a, It is sucked into 4b.

  On the other hand, one end of the oil return pipe 72 is connected to the lower part of the oil separator 7, and an on-off valve 74 is provided. The amount of refrigerating machine oil stored in the sealed containers 40a and 40b is set by the specified oil filling amount height L1 (FIG. 2) and the limit oil level (the height at which the upper cylinder is partially immersed in oil) L2.

  Further, a common high-pressure side pipe 6 is connected to the discharge pipes 5a and 5b, and an oil separator 7 is connected to the high-pressure side pipe 6. The oil separator 7 has a refrigerant outflow pipe 8, a four-way valve. An outdoor heat exchanger 10 is connected via 9. The outdoor heat exchanger 10 is connected to the indoor heat exchanger 14 via the liquid receiver 11, the packed valve 22 a, the liquid pipe 12, the packed valve 22 c, and the electronic expansion valve 13 provided in the indoor unit 3. It is connected to the outdoor unit 2 through the valve 22d, the gas pipe 15, and the packed valve 22b in this order.

  In the figure, reference numeral 4Da is a main bearing that supports the rotating shaft 4Ca, reference numeral 4Ea is a sub-bearing, and reference numeral 4Fa is a muffler.

  Next, the operation of the refrigeration cycle apparatus using the hermetic compressor of the first embodiment will be described.

  When the compressors 4 a and 4 b of the refrigeration cycle apparatus 1 as shown in FIG. 1 are operated, the refrigerant flows into the high-pressure side pipe 6 via the discharge pipes 5 a and 5 b, and the oil separator 7 is connected to the high-pressure side pipe 6. To be supplied. The oil separator 7 separates the refrigerant and the refrigerating machine oil, and the refrigerant in the oil separator 7 flows to the refrigerant outflow pipe 8 and from the refrigerant outflow pipe 8 to the four-way valve 9. During the cooling operation, the refrigerant flows through the four-way valve 9 to the outdoor heat exchanger 10 and is condensed (liquefied) by exchanging heat with outdoor air in the outdoor heat exchanger 10.

  The refrigerant that has passed through the outdoor heat exchanger 10 flows to the indoor unit 3 through the packed valve 22a, the liquid pipe 12, and the packed valve 22b in this order. The refrigerant that has flowed into the indoor unit 3 flows through the electronic expansion valve 13 to the indoor heat exchanger 14, and is vaporized by exchanging heat with the indoor air in the indoor heat exchanger 14. The refrigerant that has passed through the indoor heat exchanger 14 flows to the outdoor unit 2 through the packed valve 22d, the gas pipe 15, and the packed valve 22b in this order.

  The refrigerant that has flowed to the outdoor unit 2 flows through the four-way valve 9 to the accumulator 16, and is sucked into the compressors 4a and 4b from the low-pressure side pipe 17 through the suction pipes 18a and 18b.

  During the heating operation, the refrigerant flows in the reverse direction by switching the four-way valve 9.

  In the refrigerant compression process by the compressors 4a and 4b as described above, the oil level detection is performed as follows.

  For example, the compressors 4a and 4b of each outdoor unit are operated, and if the oil levels in the sealed containers 40a and 40b of these compressors 4a and 4b are appropriate, the refrigerating machine oil flows into the communication pipes 41a and 41b, The oil amount in the oil tank 60 is maintained, and the refrigerating machine oil flows into the oil equalizing pipe 45. If the oil levels in the sealed containers 40a and 40b of the compressors 4a and 4b are lowered, the refrigerant flows into the communication pipes 41a and 41b, and the oil level of the oil tank 60 is also lowered, so the refrigerant flows into the oil equalizing pipe 45. To do. When the temperature of each pipe is compared, if the resistance of each pipe is equal, the temperature of the pipe into which the refrigerating machine oil flows is high, and the temperature of the pipe into which the refrigerant flows is low.

  The communication pipes 41a and 41b are provided with first temperature detection sensors T1a and T1b, the oil equalizing pipe 45 is provided with a second temperature detection sensor T2, and the bypass pipe 47 is provided with a third temperature sensor T3. The oil level can be detected by comparing temperature differences detected by these temperature detection sensors T1a, T1b, T2, and T3. The outdoor unit control unit (not shown) processes the data of each of these temperature detection sensors T1a, T1b, T2, and T3, and controls the opening and closing of each valve to perform oil equalization.

  Further, in the refrigerant compression process by the compressors 4a and 4b, when the oil levels in the sealed containers 40a and 40b of the compressors 4a and 4b are higher than the connection positions of the communication pipes 41a and 41b, respectively (when the refrigerator oil is sufficient). Then, the refrigerating machine oil that exceeds the connection position flows into the communication pipes 41a and 41b as a surplus.

  The refrigerating machine oil that has flowed into the communication pipes 41a and 41b flows into the oil tank 60 through the capillary tubes 43a and 43b. A small amount of discharge gas flows into the oil tank 60 through the bypass pipe 47. The refrigerating machine oil that has flowed into the oil tank 60 is divided into the oil equalizing distribution pipes 45a and 45b by the pressure of the small amount of discharge gas and the suction force on the low pressure side, and is sucked through the capillary tubes 46a and 46b. It flows into the pipes 18a and 18b. The refrigerating machine oil that has flowed into the suction pipes 18a and 18b is sucked into the compressors 4a and 4b together with the refrigerant circulated through the refrigeration cycle apparatus 1.

  In addition, the oil level in the sealed container 40a of the compressor 4a is higher than the connection position of the communication pipe 41a, and the oil level in the sealed container 40b of the compressor 4b is lower than the connection position of the communication pipe 41b. There may be a case where the oil levels in the sealed containers 40a and 40b of the machines 4a and 4b are uneven (when the refrigerator oil is insufficient). In this case, refrigeration oil flows into the communication pipe 41a connected to the compressor 4a, and high-pressure refrigerant gas flows into the communication 4b connected to the compressor 4b. The gas joins in the oil tank 60, is separated into refrigerant and refrigerating machine oil in the oil tank 60, and enters the oil equalizing pipe 45 in a mixed state when flowing out from the oil tank 60. The mixed refrigeration oil and refrigerant flowing into the oil equalizing pipe 45 are equally divided into the oil equalizing distribution pipes 45a and 45b by the resistance action of the capillary tubes 46a and 46b. Due to this diversion, the refrigeration oil moves from the compressor 4a having a larger oil amount to the compressor 4b having a smaller oil amount, and the oil levels in the sealed containers 40a and 40b of the compressors 4a and 4b are rapidly increased. To balance.

  On the other hand, the refrigerating machine oil discharged together with the refrigerant from the discharge pipes 5 a and 5 b by the operation of the compressors 4 a and 4 b flows into the oil separator 7 through the high-pressure side pipe 6. In the oil separator 7, the refrigerating machine oil is separated from the refrigerant, and the refrigerating machine oil that exceeds the connection position of the oil return pipe 71 flows into the oil return pipe 71, and joins the oil leveling circuit in the oil leveling pipe 45. It returns to compressor 4a, 4b.

  When both the oil levels in the sealed containers 40a and 40b of the compressors 4a and 4b are lowered, the open / close valve 74 provided in the oil return pipe 72 is opened, so that the refrigerating machine oil in the oil separator 7 is supplied to the oil equalizing pipe 45. And return to the compressors 4a and 4b. Even when the compressors 4a and 4b are deficient in refrigerating machine oil, the communication pipes 41a and 41b return the refrigerating machine oil of the compressors 4a and 4b to a sufficient state and keep it substantially uniform.

Communicating pipe 41a as described above, in the oil uniformly process by 41b, as shown in FIG. 3, the openings 41a ₂ of the communication pipe 41a is because it is covered by the cover member 21a, caused by the rotation of the rotor 4Aa ₂ The refrigerant directly flowing into the opening 41a ₂ is blocked, and the refrigerating machine oil flowing down the inner wall surface of the sealed container 40a and the refrigerating machine oil mixed and scattered in the refrigerant are directly guided to the opening 41a _2. Thus, it is prevented from flowing into the communication pipes 41a and 41b, and the oil level detection accuracy is improved.

  According to the hermetic compressor of the first embodiment, a hermetic compressor capable of improving the oil level detection accuracy is realized even if a communication pipe is used for oil level detection.

  Further, according to the refrigeration cycle apparatus using the hermetic compressor of the first embodiment, the hermetic compressor that can improve the oil level detection accuracy even if the communication pipe is used for the oil level detection is used. The refrigeration cycle device that was used is realized.

  Moreover, the modification of the cover member of 1st Embodiment is demonstrated.

  In this modification, the cover member of the first embodiment opens one side and the lower side, whereas only the lower side of the cover member is opened.

For example, as shown in FIG. 4, the cover member 21a of this modification is to face the opening 41a ₂ of the communicating pipe 41a, a substantially rectangular parallelepiped space portion 21a1 which only the bottom part is the opening of the cover member 21a is formed Then, the opening 41a ₂ is opposed to the space 21a ₁ and opens.

  Thereby, the effect similar to the cover member of 1st Embodiment is acquired.

  A hermetic compressor according to the second embodiment of the present invention will be described.

  In the second embodiment, the separate cover member is fixed to the sealed container in the first embodiment, but the compression mechanism is fixed to the sealed container.

For example, as shown in FIG. 5, the hermetic compressor 4a according to the second embodiment includes a frame 4Ga that fixes the compression mechanism 4Ba to the hermetic container 40a, and the frame 4Ga includes an opening of the communication pipe 41a. A space recess 21a ₁ is formed opposite to 41a ₂ .

Thereby, the refrigerant is prevented from flowing directly to the opening 41a ₂ , and the refrigerating machine oil flowing down the inner wall surface of the sealed container 40a and the refrigerating machine oil scattered and scattered in the refrigerant directly enter the opening 41a ₂ . It is prevented from flowing into the communication pipe 41a and the oil level detection accuracy is improved. Moreover, since a separate member is not used, it is economical.

  Further, a hermetic compressor according to a third embodiment of the present invention will be described.

  The third embodiment is configured by removing the position of the opening of the communication pipe from the range of the outer circumferential notch provided in the stator, whereas the first embodiment uses a cover member as the prevention means.

For example, as shown in FIG. 6, the position of the opening 41a ₂ of the communication pipe 41a provided in the hermetic compressor 4a of the third embodiment, excluded from the plurality of ranges of the peripheral notches 4Aa ₃ provided on the stator 4Aa ₁ .

Further, as shown in FIG. 7, the opening 41a ₂ is directed downward, or as shown in FIG. 8, the end of the communication pipe 41a is closed, and an opening 41a ₂ that opens downward is provided near the end. You may do it.

Thereby, the refrigerant is prevented from flowing directly to the opening 41a ₂ , and the refrigerating machine oil flowing down the inner wall surface of the sealed container 40a and the refrigerating machine oil scattered and scattered in the refrigerant directly enter the opening 41a ₂ . It is prevented from flowing into the communication pipe 41a and the oil level detection accuracy is improved. Moreover, since a separate member is not used, it is economical.

  Moreover, the hermetic compressor according to the fourth embodiment of the present invention will be described.

  The fourth embodiment maximizes the distance from the position of the opening of the communication pipe to the discharge gas outlet provided in the muffler, whereas the first embodiment uses a cover member as the prevention means.

For example, as shown in FIG. 9, provided the discharge gas outlet 4fa ₁ on the farthest muffler 4fa from the position of the opening 41a ₂ of the communication pipe 41a provided in the hermetic compressor 4a of the fourth embodiment.

Thereby, the refrigerant is prevented from flowing directly to the opening 41a ₂ , and the refrigerating machine oil flowing down the inner wall surface of the sealed container 40a and the refrigerating machine oil scattered and scattered in the refrigerant directly enter the opening 41a ₂ . It is guided and is prevented from flowing into the communication pipes 41a and 41b, and the oil level detection accuracy is improved. Moreover, since a separate member is not used, it is economical.

The conceptual diagram of the refrigerating-cycle apparatus using the hermetic compressor which concerns on 1st Embodiment of this invention. 1 is a longitudinal sectional view of a hermetic compressor according to a first embodiment of the present invention. The perspective view of the cover member which the hermetic compressor concerning a 1st embodiment of the present invention uses. The perspective view of the modification of the cover member which the hermetic compressor concerning a 1st embodiment of the present invention uses. The longitudinal cross-sectional view of the hermetic compressor which concerns on 2nd Embodiment of this invention. The cross-sectional view of the hermetic compressor according to the third embodiment of the present invention. The longitudinal cross-sectional view of the communicating pipe used for the hermetic compressor of FIG. The longitudinal cross-sectional view of the modification of the communicating pipe of FIG. The cross-sectional view of the hermetic compressor according to the fourth embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Refrigeration cycle apparatus, 2 ... Outdoor unit, 3 ... Indoor unit, 4a, 4b ... Compressor, 4Aa ... Electric motor part, 4Ba ... Compression mechanism part, 4Ca ... Rotary shaft, 9 ... Four-way valve, 10 ... Outdoor heat exchanger , 21a ... cover member, 21a ₁ ... space part, 40a ... sealed container, 41a, 41b ... communication pipe, 45a, 45b ... oil level distribution pipe.

Claims (4)

A motor part is housed in an upper part of a sealed container storing refrigerating machine oil at the bottom, and a compression mechanism part connected to the motor part through a rotating shaft is housed in a lower part of the sealed container, and the sealed container In the hermetic compressor in which a communication pipe for detecting the oil level is connected to the side surface of the compressor, the refrigerating machine oil flowing down the inner wall surface of the hermetic container and the refrigerating machine oil scattered in the refrigerant are scattered in the opening of the communication pipe. A hermetic compressor comprising a prevention means for preventing direct guidance. 2. The hermetic compressor according to claim 1, wherein the prevention means is a cover member that covers the opening of the communication pipe and has an opening in the lower part. A hermetic compressor, wherein the cover member is also used as a frame for fixing the compression mechanism to a hermetic container. A refrigeration cycle apparatus comprising the hermetic compressor according to any one of claims 1 to 3.

Images