JP5295084B2 - Compression device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compression device with improved sealing performance of an oil seal and with high reliability, by preventing lubricating oil from flowing into an electric motor part, even under back pressure in a compression mechanism part and the electric motor part during operation. <P>SOLUTION: In the compression device 100, a space, which is not interfered with respective spaces on a compression mechanism A side and on an electric motor part A side, is formed between a through-hole 30a of a partition member 30 and a shaft 20, by oil seals 40a, 40b. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a compression device that can be preferably used for air compression, for example.

  2. Description of the Related Art Conventionally, there is a horizontal compression apparatus used for air compression or the like. As such, a horizontal scroll including a compression mechanism portion having a fixed scroll and a swing scroll and a motor portion having a shaft disposed on the side of the compression mechanism portion and driving the swing scroll. In the compression device, a partition member interposed between the compression mechanism portion and the electric motor portion and having a through hole through which the shaft is inserted, and the compression mechanism portion provided between the through hole of the partition member and the shaft. There has been proposed a "comprising a sealing member that prevents the supplied lubricating oil from flowing into the electric motor part" (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2005-273501 (3rd, 4th pages, FIGS. 2-4, etc.)

  As described above, the compression device described in Patent Document 1 includes a pressure-resistant oil seal in the seal member between the compression mechanism portion and the electric motor portion, and a fixed liquid seal portion in the oil seal. While applying pressure and lubricating the sealing liquid sealing portion with the lubricating oil, the lubricating oil in the compression mechanism portion is prevented from flowing into the electric motor portion. In addition, the oil seal liquid seal portion is disposed opposite to the lubricating oil, and is constant.

  With the configuration as described above, the internal pressure of the compression mechanism becomes negative during operation of the compression device, whereas the pressure in the motor becomes positive due to the rotation of the balancer. It becomes back pressure. For this reason, a gap due to the reverse pressure is generated between the sealing liquid sealing portion and the shaft, and there is a possibility that the lubricating oil flows into the electric motor portion when the lubricating oil enters there. As a result, the lubricating oil mixed with foreign matter such as wear powder flows into the motor winding, and the motor winding may be deteriorated or damaged.

  The present invention has been made in order to solve the above-described problems. Even in the case of back pressure in the compression mechanism portion and the motor portion during operation, the inflow of lubricating oil to the motor portion is prevented, and the seal of the oil seal An object of the present invention is to provide a highly reliable compression apparatus with improved performance.

  A compression device according to the present invention includes a compression mechanism unit having at least a fixed scroll and an orbiting scroll, an electric motor unit that drives the compression mechanism unit, a shaft that transmits a driving force of the electric motor unit to the compression mechanism unit, A partition member disposed between the compression mechanism portion and the electric motor portion and having a through-hole through which the shaft is inserted; and at least one partition member is provided between the through-hole of the partition member and the shaft; An oil seal that prevents the supplied lubricating oil from flowing into the electric motor part, and the oil seal allows the space that does not interfere with each of the space on the compression mechanism part side and the space on the electric motor part side to It is formed between the through hole of the partition member and the shaft.

  A compression device according to the present invention includes a compression mechanism unit having at least a fixed scroll and an orbiting scroll, an electric motor unit that drives the compression mechanism unit, a shaft that transmits a driving force of the electric motor unit to the compression mechanism unit, A partition member disposed between the compression mechanism portion and the motor portion and having a through hole through which the shaft is inserted; an integrated frame that supports one end of the shaft and is integrated with the partition member; and the partition member An oil seal that is provided between at least one through-hole and the shaft and prevents the lubricating oil supplied to the compression mechanism portion from flowing into the electric motor portion, and the integrated frame and the An oil seal provides a space that does not interfere with the space on the compression mechanism portion side and the space on the motor portion side, between the through hole of the partition member and the shaft. Characterized in that it is formed.

  According to the compression device according to the present invention, it is possible to prevent the inflow of lubricating oil into the electric motor unit, improve the sealing performance of the oil seal, and improve the reliability.

It is a longitudinal cross-sectional view which shows the cross-sectional structural example of the compression apparatus which concerns on Embodiment 1 of this invention. It is an expanded vertical sectional view which expands and shows the cross-sectional structure of a part of compression apparatus. It is an expanded longitudinal cross-sectional view which shows the cross-sectional structural example of a general oil seal. It is explanatory drawing for demonstrating the mechanism of the oil leak from a compression mechanism part to an electric motor part. It is an expanded longitudinal cross-sectional view which expands and shows the cross-sectional structure of a part of compression apparatus which concerns on Embodiment 2 of this invention. It is an expanded longitudinal cross-sectional view which expands and shows the cross-sectional structure of a part of compression apparatus which concerns on Embodiment 3 of this invention. It is an expanded longitudinal cross-sectional view which expands and shows the cross-sectional structure of a part of compression apparatus which concerns on Embodiment 4 of this invention. It is an enlarged vertical sectional view which expands and shows the cross-sectional structure of a part of compression apparatus which concerns on Embodiment 5 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view showing a sectional configuration example of a compression device 100 according to Embodiment 1 of the present invention. FIG. 2 is an enlarged longitudinal sectional view showing an enlarged sectional configuration of a part of the compression device 100. Based on FIG.1 and FIG.2, the structure and operation | movement of the compression apparatus 100 are demonstrated. This compression apparatus 100 can be preferably used for air compression, for example. In the first embodiment, a case where the compression device 100 is a horizontal scroll compression device will be described as an example. The case where air is compressed by the compressor 100 will be described as an example. Furthermore, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one.

  The compression device 100 includes at least a compression mechanism portion A having a fixed scroll 1 and an orbiting scroll 2 and an electric motor portion B that drives the compression mechanism portion A from the side. The compression mechanism section A includes a suction pipe 3 for air to be compressed, a known scroll compression section 5 that compresses the sucked air between the fixed scroll 1 and the swing scroll 2 and discharges it from the discharge hole 4, and a shaft 20. A frame 6 for supporting one end of the shaft, a main bearing 7 provided between the frame 6 and the shaft 20, an eccentric shaft portion 20a formed at one end (left end in the figure) of the shaft 20, and a swinging motion. An oscillating bearing 8 provided between a boss portion 2a fitted to an eccentric shaft portion 20a formed on the back surface portion of the scroll 2, and an oil supply pipe that feeds lubricating oil to the main bearing 7 through the frame 6. 9 and the like.

  Further, the compression mechanism portion A communicates with the main bearing 7, an oil return chamber 10 provided on the motor portion B side below the scroll compression portion 5, one end portion of the main bearing 7 is opened, and the other end portion is A passage 11 provided in the shaft 20 so as to extend in the axial direction and open toward the rocking bearing 8, a suction chamber 12 including the fixed scroll 1 and the rocking scroll 2, and an oil return chamber 10. And a passage 13 that communicates with the suction chamber 12. That is, the suction chamber 12 composed of the fixed scroll 1 and the swing scroll 2 communicates with the oil return chamber 10 via the passage 13. The compression device 100 fixes and surrounds the frame 6 holding the main bearing 7 and the rocking bearing 8, and connects the compression mechanism part A and the motor part B to form a sealed container. A crankcase 14 is provided.

  On the other hand, the motor part B includes a stator 15 that is closely fixed to the crankcase 14 by shrink fitting, a rotor 16 that is also closely fixed to the shaft 20 by shrink fitting, and the rotor 16 together with the main bearing 7. The bearing 17 that supports the shaft 20 on both sides, the cooling fan 18 fixed to the other end of the shaft 20 outside the crankcase 14, and the cooling fan 18 and a part of the crankcase 14 are covered, and the cooling fan 18, a cover 21 that forms a cooling air passage 19 between the crankcase 14 and a balancer 22 fixed to the shaft 20 in the motor part B, and the like.

  The compression mechanism part A and the electric motor part B are separated into right and left in the drawing by a partition member 30 in a crankcase 14 made of, for example, a lightweight aluminum-based material. A shaft 20 that is an output shaft of the electric motor part B connected to the orbiting scroll 2 of the compression mechanism part A is provided through a through hole 30 a provided in the central part of the partition member 30. An oil seal 40 a and an oil seal 40 b are provided between the through hole 30 a of the partition member 30 and the outer peripheral surface of the shaft 20 facing the partition member 30. The oil seal 40a and the oil seal 40b are arranged in series between the through hole 30a of the partition member 30 and the outer peripheral surface of the shaft 20 facing the seal member 40c and the seal liquid seal portion 40d so as to face each other. Yes. And between the oil seal 40a and the oil seal 40b, the space which does not interfere with each of the space by the side of the compression mechanism part A and the space by the side of the electric motor part B is formed.

Next, the operation of the compression apparatus 100 will be described.
Lubricating oil (not shown) is pumped only to the compression mechanism portion A by the oil supply pipe 9 as indicated by the broken line arrow. After the lubricating oil fed from the oil supply pipe 9 is supplied around the main bearing 7, one of the lubricating oil flows into the suction chamber 12 through the passage 11 provided in the shaft 20 and through the rocking bearing 8. Further, the other proceeds from the main bearing 7 in the right direction in the figure, but since it is sealed between the shaft 20 by the oil seal 40a and the oil seal 40b, the oil seal is also against the negative pressure P1 during operation. The oil 40a and the oil seal 40b do not have back pressure, and the lubricating oil cannot enter the motor part B, flows into the oil return chamber 10, flows into the suction chamber 12 through the passage 13, and passes through the passage 11. And is sucked into the compression chamber together with air.

  As described above, the oil return chamber 10 communicates with the suction chamber 12 of the compression mechanism portion A via the passage 13, and thus is always in a negative pressure state during the operation of the compression device 100. Thereafter, the lubricating oil is discharged from the discharge hole 4 together with the compressed air, separated from the air by an oil separator (not shown) outside the compression device 100, and returned to the compression mechanism portion A through the oil supply pipe 9 and circulated again. Will do.

  FIG. 3 is an enlarged longitudinal sectional view showing a cross-sectional configuration example of a general oil seal. The oil seal (hereinafter referred to as the oil seal 40) will be described with reference to FIG. In the compression apparatus 100, oil seals 40 that are generally well used are used as the oil seal 40a and the oil seal 40b. These are arranged in series so that the sealing liquid sealing part 40c and the sealing liquid sealing part 40d face each other between the through hole 30a of the partition member 30 and the outer peripheral surface of the shaft 20 facing each other.

  The vertical cross-sectional configuration of the oil seal 40 has a substantially U shape in which the length on the outer peripheral surface side of the shaft 20 is shorter than the length on the partition member 30 side. Further, a dust seal portion 40e is provided on the outer peripheral surface side of the shaft 20 of the oil seal 40 and on the motor portion B side, and a seal liquid sealing portion is provided on the outer peripheral surface side of the shaft 20 of the oil seal 40 and on the compression mechanism portion A side. (Sealing liquid sealing part 40c, sealing liquid sealing part 40d) are formed, respectively. That is, in the compression device 100, the two oil seals 40 having the shape as shown in FIG. 3 are connected to the outer peripheral surface of the shaft 20 facing the through hole 30a of the partition member 30 so that the sealing liquid sealing portion faces each other. It is arranged between them.

  FIG. 4 is an explanatory diagram for explaining a mechanism of oil leakage from the compression mechanism part A to the electric motor part B. FIG. Based on FIG. 4, the mechanism of the oil leakage from the compression mechanism part A to the electric motor part B is demonstrated with the pressure state around an oil seal installation location. FIG. 4 shows an example in which only one oil seal (hereinafter referred to as an oil seal 40 ′) is provided between the through hole 30a of the partition member 30 and the outer peripheral surface of the shaft 20 facing the partition member 30. Yes. The oil seal 40 'is provided so that the sealing liquid sealing part is located on the compression mechanism part A side. Further, a state where the oil seal 40 'is deformed is also illustrated.

  In FIG. 4, during operation, the pressure P (a) in the oil return chamber 10 is smaller than atmospheric pressure, and the pressure P (b) on the motor part B side across the oil seal 40 ′ is substantially equal to atmospheric pressure. . Therefore, P (a) <P (b) and back pressure is applied to the oil seal 40 '. That is, the oil seal 40 'is weak against P (b). Due to the back pressure applied to the oil seal 40 ′, the seal liquid sealing portion is floated with respect to the shaft 20. By repeating the operation and the stop, the sealing liquid sealing part scrapes out the lubricating oil on the sealing liquid sealing part side to the electric motor part B side, and oil leakage occurs. Therefore, in order to provide the oil seal 40 'in the orientation shown in FIG. 4, it is necessary that P (a)> P (b).

  On the other hand, the compression device 100 includes two oil seals in series so that the sealing liquid sealing part 40c of the oil seal 40a and the sealing liquid sealing part 40d of the oil seal 40b face each other. During operation, the pressure P1 in the oil return chamber 10 is negative, but the pressure P2 in the chamber 23 between the oil seal 40a and the oil seal 40b can be prevented from becoming negative (P1 <atmospheric pressure, P2≈ Atmospheric pressure). Further, the pressure P3 on the electric motor part B side with the oil seal 40b interposed therebetween is substantially equal to the atmospheric pressure (P3≈atmospheric pressure).

  P1 <P2, and no back pressure is applied to the oil seal 40a and the oil seal 40b. Therefore, the oil seal 40a and the oil seal 40b can be functioned normally. That is, since the sealing liquid sealing part 40c and the sealing liquid sealing part 40d that play the role of the sealing function can ignore the back pressure due to the negative pressure P1, they normally play the role of the sealing function, and the lubricating oil flows into the electric motor part B. Inflow can be prevented.

  As described above, according to the compression device 100 according to the first embodiment, the lubricating oil supplied to the compression mechanism part A flows into the electric motor part B between the shaft 20 and the through hole 30a of the partition member 30. Since the oil seal 40a and the oil seal 40b are provided, the lubricating oil does not flow into the space having the motor part B, and the motor winding is deteriorated or damaged due to the inflow of lubricating oil mixed with wear powder or the like. Can be prevented. Moreover, according to the compression apparatus 100, since sealing performance can be improved, oil quantity reduction and oil scattering due to oil leakage can be prevented, and reliability can be improved.

Embodiment 2.
FIG. 5 is an enlarged longitudinal sectional view showing an enlarged sectional configuration of a part of the compression apparatus according to Embodiment 2 of the present invention. Based on FIG. 5, the characteristic part of the compression apparatus which concerns on Embodiment 2 is demonstrated. The compression apparatus according to Embodiment 2 can be preferably used for air compression, for example. In the second embodiment, a case where the compression device is a horizontal scroll compression device will be described as an example. Further, a case where air is compressed by a compression device will be described as an example. Further, the second embodiment will be described with a focus on differences from the first embodiment, and the same parts as those of the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

  In the second embodiment, in addition to the features of the first embodiment, a room between the oil seal 40a and the oil seal 40b (a space that does not interfere with each of the space on the compression mechanism part A side and the space on the motor part B side). 23 is filled with lubricating oil 50. That is, in the second embodiment, the oil seal 40a and the oil seal 40b are disposed between the through hole 30a of the partition member 30 and the outer peripheral surface of the shaft 20 facing the seal liquid sealing part 40c and the seal liquid sealing part 40d. They are arranged in series so as to face each other, and the lubricating oil 50 is sealed in the chamber 23 between the oil seal 40a and the oil seal 40b.

Next, the operation of the compression apparatus according to Embodiment 2 will be described.
The lubricating oil 50 is pumped only to the compression mechanism portion A by the oil supply pipe 9 as indicated by the broken line arrow. After the lubricating oil 50 pumped from the oil supply pipe 9 is supplied around the main bearing 7, one of the lubricating oil 50 passes through the passage 11 provided in the shaft 20 and flows into the suction chamber 12 through the rocking bearing 8. Further, the other proceeds from the main bearing 7 in the right direction in the figure, but since it is sealed between the shaft 20 by the oil seal 40a and the oil seal 40b, the oil seal is also against the negative pressure P1 during operation. The oil 40a and the oil seal 40b do not have back pressure, and the lubricating oil 50 cannot enter the motor part B, flows into the oil return chamber 10, flows into the suction chamber 12 through the passage 13, and lubricates through the passage 11. The oil 50 joins and is sucked into the compression chamber together with air.

  As described above, the oil return chamber 10 communicates with the suction chamber 12 of the compression mechanism section A through the passage 13, and therefore, the oil return chamber 10 is always in a negative pressure state during the operation of the compression device according to the second embodiment. It has become. Thereafter, the lubricating oil 50 is discharged from the discharge hole 4 together with the compressed air, separated from the air by an oil separator (not shown) outside the compression apparatus according to Embodiment 2, and again through the oil supply pipe 9 to the compression mechanism section A. It will be circulated back inside. Furthermore, by previously sealing the lubricating oil 50 in the chamber 23, the sealing liquid sealing part 40c and the sealing liquid sealing part 40d can be lubricated even during operation, and the sealing performance can be further improved. .

  Therefore, in the compression device according to the second embodiment, two oil seals are provided in series so that the sealing liquid sealing part 40c of the oil seal 40a and the sealing liquid sealing part 40d of the oil seal 40b face each other. Therefore, during operation, the pressure P1 in the oil return chamber 10 is negative, but the pressure P2 in the chamber 23 between the oil seal 40a and the oil seal 40b can be prevented from becoming negative (P1 <high). Atmospheric pressure, P2≈atmospheric pressure). Further, the pressure P3 on the electric motor part B side with the oil seal 40b interposed therebetween is substantially equal to the atmospheric pressure (P3≈atmospheric pressure).

  P1 <P2, and no back pressure is applied to the oil seal 40a and the oil seal 40b. Therefore, the oil seal 40a and the oil seal 40b can be functioned normally. That is, since the sealing liquid sealing part 40c and the sealing liquid sealing part 40d that play the role of the sealing function can ignore the back pressure due to the negative pressure P1, they normally play the role of the sealing function, and the lubricating oil enters the motor part B. Inflow can be prevented. Further, since the lubricating oil 50 is sealed in the chamber 23 and sufficient sealing oil 50 can be supplied to the sealing liquid sealing part 40c and the sealing liquid sealing part 40d even during operation, the sealing liquid sealing part 40c, the seal The sealing performance of the liquid sealing part 40d can be further improved.

  As described above, according to the compression device according to the second embodiment, the lubricating oil supplied to the compression mechanism portion A flows into the electric motor portion B between the shaft 20 and the through hole 30a of the partition member 30. By providing the oil seal 40a and the oil seal 40b to prevent the lubricating oil from flowing into the space having the electric motor part B, the deterioration and scratches of the motor winding due to the inflow of lubricating oil mixed with wear powder and the like are prevented. can do. Moreover, according to the compression apparatus which concerns on Embodiment 2, since sealing performance can be improved, the oil amount reduction | decrease and oil scattering by oil leakage can be prevented, and the improvement of reliability can be aimed at.

Embodiment 3.
FIG. 6 is an enlarged longitudinal sectional view showing an enlarged sectional configuration of a part of the compression device according to Embodiment 3 of the present invention. Based on FIG. 6, the characteristic part of the compression apparatus which concerns on Embodiment 3 is demonstrated. The compression device according to Embodiment 3 can be preferably used for air compression, for example. In the third embodiment, a case where the compression device is a horizontal scroll compression device will be described as an example. Further, a case where air is compressed by a compression device will be described as an example. Furthermore, the third embodiment will be described with a focus on differences from the first and second embodiments, and the same parts as those of the first and second embodiments will be denoted by the same reference numerals and the description thereof will be omitted. It shall be.

  In the third embodiment, in addition to the features of the second embodiment, lubricating oil (not shown) is pumped to the chamber 23 between the oil seal 40a and the oil seal 40b by the oil supply pipe 9a. That is, in the third embodiment, the oil seal 40a and the oil seal 40b are disposed between the through hole 30a of the partition member 30 and the outer peripheral surface of the shaft 20 facing the seal liquid sealing part 40c and the seal liquid sealing part 40d. In addition to being arranged in series so as to face each other, an oil supply pipe 9 a that passes through the frame 6 and supplies lubricating oil to the chamber 23 is provided, and the lubricating oil is pumped to the chamber 23. A pressure adjusting valve 9b for adjusting the pressure in the chamber 23 is provided upstream of the oil supply pipe 9a.

Next, the operation of the compression apparatus according to Embodiment 3 will be described.
Lubricating oil (not shown) is pumped to the compression mechanism A by the oil supply pipe 9 and to the chamber 23 via the pressure adjusting valve 9b by the oil supply pipe 9a, as indicated by the broken line arrows. After the lubricating oil fed from the oil supply pipe 9 is supplied around the main bearing 7, one of the lubricating oil flows into the suction chamber 12 through the passage 11 provided in the shaft 20 and through the rocking bearing 8. Further, the other proceeds from the main bearing 7 in the right direction in the figure, but since it is sealed between the shaft 20 by the oil seal 40a and the oil seal 40b, the oil seal is also against the negative pressure P1 during operation. The oil 40a and the oil seal 40b do not have back pressure, and the lubricating oil cannot enter the motor part B, flows into the oil return chamber 10, flows into the suction chamber 12 through the passage 13, and passes through the passage 11. And is sucked into the compression chamber together with air.

  As described above, the oil return chamber 10 communicates with the suction chamber 12 of the compression mechanism section A through the passage 13, and therefore, the oil return chamber 10 is always in a negative pressure state during the operation of the compression apparatus according to the third embodiment. It has become. Thereafter, the lubricating oil is discharged from the discharge hole 4 together with the compressed air, separated from the air by an oil separator (not shown) outside the compression apparatus according to Embodiment 3, and compressed again through the oil supply pipe 9 and the oil supply pipe 9a. It returns to the mechanism part A and the room 23 and circulates. Further, the lubricating oil is pumped into the chamber 23 via the oil supply pipe 9a, and the pressure in the chamber 23 can be adjusted by the pressure regulating valve 9b, so that the sealing liquid sealing portion 40c and the sealing liquid sealing portion 40d are also operated. It becomes possible to lubricate and improve the sealing performance.

  Therefore, in the compression device according to the third embodiment, two oil seals are provided in series so that the seal liquid sealing part 40c of the oil seal 40a and the seal liquid sealing part 40d of the oil seal 40b face each other. Therefore, during operation, the pressure P1 in the oil return chamber 10 is a negative pressure, but the pressure P2 in the chamber 23 between the oil seal 40a and the oil seal 40b can be made larger than the atmospheric pressure so that the pressure becomes negative. (P1 <atmospheric pressure, P2> atmospheric pressure). Further, the pressure P3 on the electric motor part B side across the oil seal 40b is substantially equal to the atmospheric pressure (P3≈atmospheric pressure).

  P1 <P2, P2> P3, and no back pressure is applied to the oil seal 40a and the oil seal 40b. Therefore, the oil seal 40a and the oil seal 40b can be functioned normally. That is, the pressure P2 in the chamber 23 can be adjusted by the pressure regulating valve 9b, and the sealing liquid sealing part 40c and the sealing liquid sealing part 40d that serve as a sealing function can ignore the back pressure due to the negative pressure P1, so that It plays the role of a sealing function and can prevent the lubricating oil from flowing into the electric motor part B. Furthermore, since the lubricating oil is sealed in the chamber 23 and sufficient lubricating oil is pumped to the sealing liquid sealing part 40c and the sealing liquid sealing part 40d even during operation, the sealing liquid sealing part 40c and the sealing liquid sealing part The sealing performance of 40d can be further improved.

  As described above, according to the compression device according to the third embodiment, the lubricating oil supplied to the compression mechanism part A flows into the electric motor part B between the shaft 20 and the through hole 30a of the partition member 30. By providing the oil seal 40a and the oil seal 40b to prevent the lubricating oil from flowing into the space having the electric motor part B, the deterioration and scratches of the motor winding due to the inflow of lubricating oil mixed with wear powder and the like are prevented. can do. Moreover, according to the compression apparatus which concerns on Embodiment 3, since sealing performance can be improved, the oil amount reduction | decrease and oil scattering by oil leakage can be prevented, and the improvement of reliability can be aimed at.

Embodiment 4.
FIG. 7 is an enlarged longitudinal sectional view showing an enlarged sectional configuration of a part of the compression apparatus according to Embodiment 4 of the present invention. Based on FIG. 7, the characteristic part of the compression apparatus which concerns on Embodiment 4 is demonstrated. The compression apparatus according to Embodiment 4 can be preferably used for air compression, for example. In the fourth embodiment, a case where the compression device is a horizontal scroll compression device will be described as an example. Further, a case where air is compressed by a compression device will be described as an example. Further, the fourth embodiment will be described with a focus on differences from the first to third embodiments, and the same parts as those of the first to third embodiments will be denoted by the same reference numerals and description thereof will be omitted. It shall be.

  In the fourth embodiment, the features of the third embodiment are slightly changed, a partition wall 35 is provided in a part of the through hole 30a instead of the oil seal 40a, and a chamber (compression) between the partition wall 35 and the oil seal 40b is provided. Lubricating oil (not shown) is pumped by an oil supply pipe 9a into a space 24 that does not interfere with the space on the mechanism part A side and the space on the electric motor part B side. That is, in the fourth embodiment, the partition wall 35 and the oil seal 40b are disposed between the through hole 30a of the partition member 30 and the outer peripheral surface of the shaft 20 facing the partition member 30, and penetrate the frame 6 into the chamber 23. An oil supply pipe 9 a for supplying the lubricating oil is provided, and the lubricating oil is pumped into the chamber 24. A pressure adjusting valve 9b for adjusting the pressure in the chamber 24 is provided upstream of the oil supply pipe 9a. The oil seal 40b is disposed so that the seal liquid sealing portion 40d faces the partition wall 35.

Next, the operation of the compression apparatus according to Embodiment 4 will be described.
Lubricating oil (not shown) is pumped to the compression mechanism part A by the oil supply pipe 9 and to the chamber 24 via the pressure adjustment valve 9b by the oil supply pipe 9a, as indicated by the broken line arrows. After the lubricating oil fed from the oil supply pipe 9 is supplied around the main bearing 7, one of the lubricating oil flows into the suction chamber 12 through the passage 11 provided in the shaft 20 and through the rocking bearing 8. On the other hand, the other proceeds from the main bearing 7 to the right in the figure, but since the oil seal 40b is sealed between the shaft 20 and the oil seal 40b, the oil seal 40b is back pressure against the negative pressure P1 during operation. The lubricating oil cannot enter the motor part B, flows into the oil return chamber 10, flows into the suction chamber 12 through the passage 13, merges with the lubricating oil that has passed through the passage 11, and the compression chamber together with air. Inhaled.

  As described above, the oil return chamber 10 communicates with the suction chamber 12 of the compression mechanism section A via the passage 13, and therefore, the oil return chamber 10 is always in a negative pressure state during the operation of the compression apparatus according to the fourth embodiment. It has become. After that, the lubricating oil is discharged from the discharge hole 4 together with the compressed air, separated from the air by an oil separator (not shown) outside the compression apparatus according to Embodiment 4, and compressed again through the oil supply pipe 9 and the oil supply pipe 9a. It returns to the mechanism part A and the room 24 and circulates. Furthermore, the sealing liquid sealing portion 40d can be lubricated even during operation by pumping the lubricating oil into the chamber 24 via the oil supply pipe 9a and making the pressure in the chamber 24 adjustable by the pressure adjusting valve 9b. Thus, the sealing performance can be further improved.

  Therefore, in the compression device according to the fourth embodiment, since the partition wall 35 and the seal liquid sealing portion 40d of the oil seal 40b are provided to face each other, the pressure P1 of the oil return chamber 10 during operation is Although it is a negative pressure, the pressure P2 in the chamber 24 between the partition wall 35 and the oil seal 40b can be made larger than the atmospheric pressure and can be prevented from becoming a negative pressure (P1 <atmospheric pressure, P2> atmospheric pressure). Further, the pressure P3 on the electric motor part B side across the oil seal 40b is substantially equal to the atmospheric pressure (P3≈atmospheric pressure).

  P1 <P2, P2> P3, and no back pressure is applied to the oil seal 40b. Therefore, the oil seal 40b can be functioned normally. That is, the pressure P2 in the chamber 24 can be adjusted by the pressure regulating valve 9b, and the sealing liquid sealing part 40d that plays the role of the sealing function can normally ignore the back pressure due to the negative pressure P1, and thus normally plays the role of the sealing function. The lubricating oil can be prevented from flowing into the electric motor part B. Furthermore, since the lubricating oil is sealed in the chamber 24 and sufficient lubricating oil is pumped to the sealing liquid sealing part 40d even during operation, the sealing performance of the sealing liquid sealing part 40d can be further improved.

  As described above, according to the compression device according to the fourth embodiment, the lubricating oil supplied to the compression mechanism portion A flows into the electric motor portion B between the shaft 20 and the through hole 30a of the partition member 30. By providing the blocking partition 35 and the oil seal 40b, the lubricating oil does not flow into the space having the motor part B, and the motor winding is prevented from being deteriorated or damaged by the inflow of lubricating oil mixed with wear powder or the like. be able to. Moreover, according to the compression apparatus which concerns on Embodiment 4, since sealing performance can be improved, the oil amount reduction | decrease and oil scattering by oil leakage can be prevented, and the improvement of reliability can be aimed at.

Embodiment 5.
FIG. 8 is an enlarged longitudinal sectional view showing an enlarged sectional configuration of a part of the compression apparatus according to Embodiment 5 of the present invention. Based on FIG. 8, the characteristic part of the compression apparatus which concerns on Embodiment 5 is demonstrated. The compression device according to Embodiment 5 can be preferably used for air compression, for example. In the fifth embodiment, a case where the compression device is a horizontal scroll compression device will be described as an example. Further, a case where air is compressed by a compression device will be described as an example. Further, the fifth embodiment will be described with a focus on differences from the first to fourth embodiments, and the same parts as those of the first to fourth embodiments will be denoted by the same reference numerals and the description thereof will be omitted. It shall be.

  In the fifth embodiment, the features of the fourth embodiment are slightly changed to form an integrated frame 6a in which the frame 6 and the partition member 30 are integrated, and the integrated frame 6a includes an oil seal 40b. Yes. The compression mechanism part A and the electric motor part B are separated on the left and right in the figure by an integrated frame 6a. The shaft 20 which is the output shaft of the electric motor part B connected to the rocking scroll 2 of the compression mechanism part A is provided through a through hole 30b provided in the central part of the integrated frame 6a. An oil seal 40b is provided between the through hole 30b of the integrated frame 6a and the outer peripheral surface of the shaft 20 facing the integrated frame 6a. That is, the compression frame A and the space between the through hole 30b and the shaft 20 are separated by the integrated frame 6a.

  The oil seal 40b is arranged so that the sealing liquid sealing part 40d faces the compression mechanism part A. Further, upstream of the oil supply pipe 9, a pressure adjusting valve 9 c that adjusts the pressure on the upstream side of the oil seal 40 b (the space that does not interfere with the space on the compression mechanism portion A side and the space on the electric motor portion B side) is provided. .

Next, the operation of the compression apparatus according to Embodiment 5 will be described.
Lubricating oil (not shown) is pumped only to the compression mechanism portion A through the pressure adjusting valve 9c by the oil supply pipe 9, as shown by the broken line arrow. After the lubricating oil 50 pumped from the oil supply pipe 9 is supplied around the main bearing 7, one of the lubricating oil 50 passes through the passage 11 provided in the shaft 20 and flows into the suction chamber 12 through the rocking bearing 8.

  Further, the other is supplied from the main bearing 7 to the oil seal 40b and is sealed between the shaft 20 while sufficiently lubricating the sealing liquid sealing portion 40d. It flows into the chamber 10, flows into the suction chamber 12 through the passage 13, merges with the lubricating oil that has passed through the passage 11, and is sucked into the compression chamber together with air. Then, it is discharged from the discharge hole 4 together with the compressed air, separated from the air by an oil separator (not shown) outside the apparatus, and returned to the compression mechanism part A through the oil supply pipe 9 and circulated.

  Therefore, in the compression device according to the fifth embodiment, the frame 6 and the partition member 30 are integrated into the integrated frame 6a, and the integrated frame 6a includes the oil seal 40b. 9, the lubricating oil is pumped directly to the oil seal 40b through the pressure regulating valve 9c, and the pressure in the vicinity of the upstream portion of the oil seal 40b can be adjusted, and the pressure P1 in the oil return chamber 10 becomes a negative pressure. Since a separate space is formed by 6a, the pressure P2 in the vicinity of the upstream portion of the oil seal 40b can be made larger than the atmospheric pressure and can be prevented from becoming a negative pressure (P1 <atmospheric pressure, P2> atmospheric pressure). Further, the pressure P3 on the electric motor part B side across the oil seal 40b is substantially equal to the atmospheric pressure (P3≈atmospheric pressure).

  P1 <atmospheric pressure, P2> P3, and no back pressure is applied to the oil seal 40b. Therefore, the oil seal 40b can be functioned normally. That is, the pressure P2 in the vicinity of the upstream portion of the oil seal 40b can be adjusted by the pressure regulating valve 9c, and the sealing liquid sealing portion 40d that plays the role of the sealing function can ignore the back pressure due to the negative pressure P1, so that the normal sealing function is achieved. It plays a role and can prevent the lubricating oil from flowing into the electric motor part B. Furthermore, since sufficient lubricating oil is pumped to the sealing liquid sealing part 40d even during operation, the sealing performance of the sealing liquid sealing part 40d can be further improved.

  As described above, according to the compression device according to the fifth embodiment, the frame 6 and the partition member 30 are integrated, and the compression mechanism portion A is interposed between the shaft 20 and the through hole 30b of the integrated frame 6a. By providing the oil seal 40b that prevents the lubricating oil supplied to the motor part B from flowing into the motor part B, the lubricating oil does not flow into the space having the motor part B, but by the inflow of lubricating oil mixed with wear powder or the like It is possible to prevent deterioration and scratches on the motor windings. Moreover, according to the compression apparatus which concerns on Embodiment 5, since sealing performance can be improved, the oil amount reduction | decrease and oil scattering by oil leakage can be prevented, and the improvement of reliability can be aimed at.

  As described above, in the embodiment, the seal structure using the oil seal 40a and the oil seal 40b has been described as an example. However, the present invention is not limited to this, and other materials and configurations may be used as long as they have similar functions. There is no problem. Further, the case where the pressure adjusting valve is used as the member for adjusting the pressure of the lubricating oil to be pumped has been described as an example, but the present invention is not limited to this, and a capillary tube or the like that can obtain the same effect may be used. Good. Furthermore, in the embodiment, the case where air is compressed has been described as an example. However, the object of compression is not necessarily limited to air, and the same effect can be expected even when other gases such as nitrogen gas, refrigerant, and the like are used. . Furthermore, in the embodiment, the horizontal type compression device has been described as an example, but the same effect can be expected even with a vertical type compression device.

  DESCRIPTION OF SYMBOLS 1 Fixed scroll, 2 Swing scroll, 2a Boss part, 3 Suction pipe, 4 Discharge hole, 5 Scroll compression part, 6 Frame, 6a Integrated frame, 7 Main bearing, 8 Swing bearing, 9 Oil supply pipe, 9a Oil supply pipe 9b Pressure regulating valve, 9c Pressure regulating valve, 10 Oil return chamber, 11 passage, 12 Suction chamber, 13 passage, 14 Crankcase, 15 Stator, 16 Rotor, 17 Bearing, 18 Cooling fan, 19 Cooling air passage , 20 shaft, 20a eccentric shaft part, 21 cover, 22 balancer, 23 room, 24 room, 30a through hole, 30b through hole, 35 partition, 40 oil seal, 40a oil seal, 40b oil seal, 40c seal liquid sealing part, 40d Seal liquid sealing part, 40e Dust seal part, 50 Lubricating oil, 100 Compressor, A Compression mechanism part B motor unit.

Claims (8)

A compression mechanism having at least a fixed scroll and an orbiting scroll;
An electric motor that drives the compression mechanism;
A shaft that transmits the driving force of the electric motor unit to the compression mechanism unit;
A partition member disposed between the compression mechanism portion and the electric motor portion, and having a through hole through which the shaft is inserted;
An oil seal provided between the through hole of the partition member and the shaft, and an oil seal for preventing the lubricating oil supplied to the compression mechanism portion from flowing into the electric motor portion;
By the oil seal,
A compression device, wherein a space that does not interfere with each of the space on the compression mechanism portion side and the space on the motor portion side is formed between the through hole of the partition member and the shaft. Two oil seals are provided,
The two oil seals are
The compression apparatus according to claim 1, wherein the compression liquid seal portions are arranged so as to face each other to form the space. A compression mechanism having at least a fixed scroll and an orbiting scroll;
An electric motor that drives the compression mechanism;
A shaft that transmits the driving force of the electric motor unit to the compression mechanism unit;
A partition member disposed between the compression mechanism portion and the electric motor portion, and having a through hole through which the shaft is inserted;
An oil seal that is provided between the through hole of the partition member and the shaft, and that prevents the lubricating oil supplied to the compression mechanism portion from flowing into the electric motor portion;
A partition provided between the through hole of the partition member and the shaft and provided in a part of the through hole of the partition member;
By the oil seal and the partition wall,
A compression device, wherein a space that does not interfere with each of the space on the compression mechanism portion side and the space on the motor portion side is formed between the through hole of the partition member and the shaft. The oil seal is
The compression device according to claim 3, wherein a sealing liquid sealing portion is arranged to face the partition wall to form the space. A compression mechanism having at least a fixed scroll and an orbiting scroll;
An electric motor that drives the compression mechanism;
A shaft that transmits the driving force of the electric motor unit to the compression mechanism unit;
A partition member disposed between the compression mechanism portion and the electric motor portion, and having a through hole through which the shaft is inserted;
An integrated frame that supports one end of the shaft and is integrated with the partition member;
An oil seal provided between the through hole of the partition member and the shaft, and an oil seal for preventing the lubricating oil supplied to the compression mechanism portion from flowing into the electric motor portion;
By the integrated frame and the oil seal,
A compression device, wherein a space that does not interfere with each of the space on the compression mechanism portion side and the space on the motor portion side is formed between the through hole of the partition member and the shaft. The oil seal is
The compression device according to claim 5, wherein a sealing liquid sealing portion is arranged so as to face the compression mechanism portion side to form the space. Lubricating oil is enclosed in the space. The compression device according to any one of claims 1 to 6. The compression device according to any one of claims 1 to 6, wherein lubricating oil can be pumped into the space via a pressure regulating valve.

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