JP4690743B2 - Scroll compressor and air conditioner - Google Patents

Description

  The present invention relates to a scroll compressor and an air conditioner, and more particularly to an oil supply structure in a scroll portion of the scroll compressor.

  In the compression chamber formed between the fixed scroll and the orbiting scroll in the scroll compressor, compression leakage may occur from the gap between the scrolls during compression. When such a compression leak occurs, the compression efficiency of the compressor is rapidly reduced. 2. Description of the Related Art In recent years, as a new type of scroll compressor, one having a stepped portion at the upper edge portion of a spiral scroll wrap and a scroll end plate bottom is known (for example, Patent Document 1). In this scroll compressor, the height of the spiral spiral wrap on the outer periphery of the scroll becomes relatively large by providing step portions on the upper edge and the end plate of the spiral spiral wrap. The volume increases. Thereby, compressor efficiency can be improved. In addition, since the wrap height is relatively low at the center of the spiral wrap where the compression reaction force of the fluid acts most, there is no problem of rigidity.

JP 2002-303281 A

  However, in this scroll compressor, since there are step portions on the spiral wrap tooth tips and bottoms of the fixed scroll and the orbiting scroll, compression leakage may occur from the step portions, and technology for preventing this compression leakage is extremely important. It is.

  Therefore, the present invention has been made in view of the above, and an object thereof is to provide a scroll compressor and an air conditioner that can efficiently reduce compression leakage.

In order to solve the above-described problems and achieve the object, the scroll compressor according to the present invention is such that a fixed scroll and a turning scroll in which a spiral wrap is erected on one side surface of each end plate mesh with each other. In the scroll compressor forming the compression chamber, the fixed scroll and the orbiting scroll wrap have an upper edge forming a tooth tip, and a step portion on the tooth tip side is formed on the tooth tip. The height is different and one side surface of the end plate of the fixed scroll and the orbiting scroll forms a tooth bottom, and a step on the tooth bottom side is formed on the tooth bottom. And at least one of the fixed scroll and the orbiting scroll is provided with an oil supply means for supplying oil to the stepped portion,
At least one of the contact member that contacts the orbiting scroll and that forms a sliding surface when the orbiting scroll makes an orbiting movement, or at least one of the orbiting scroll and the oil supply means It is characterized in that a connected oil supply section is provided.

  According to the present invention, oil can be directly supplied from the oil supply portion to the step portion of the scroll where compression leakage may occur, so that an oil film can be formed on the contact surface in the step portion. The gap can be reduced. As a result, it is possible to increase the sealing degree of the compression chamber and improve the compression efficiency without requiring advanced processing technology and processing accuracy in the step portion of the scroll, and without performing special coating or the like. .

  In the scroll compressor according to the next invention, the contact member is an end plate of the fixed scroll.

  According to this invention, since the oil supply portion is provided on the end plate of the fixed scroll that comes into contact with the orbiting scroll, the oil supply means and the oil supply portion can communicate with each other during the orbiting motion of the orbiting scroll, and the oil is directly supplied to the stepped portion. Therefore, an oil film can be formed on the contact surface in the step portion, and the gap in the step portion can be reduced. Thereby, the sealing degree of a compression chamber can be raised and compression efficiency can be improved efficiently.

  The scroll compressor according to the next invention is characterized in that the contact member is a back pressure seal disposed on the rear face of the end plate of the orbiting scroll.

  According to this invention, since the oil supply portion is provided in the back pressure seal that comes into contact with the orbiting scroll, the oil supply means and the oil supply portion can be communicated during the orbiting motion of the orbiting scroll, and the oil is directly supplied to the stepped portion. Therefore, an oil film can be formed on the contact surface in the stepped portion, and the gap in the stepped portion can be reduced. Thereby, the sealing degree of a compression chamber can be raised and compression efficiency can be improved efficiently.

  In the scroll compressor according to the next invention, the contact member is a thrust bearing that supports the orbiting scroll.

  According to the present invention, since the oil supply portion is provided in the thrust bearing that comes into contact with the orbiting scroll, the oil supply means and the oil supply portion can be communicated during the orbiting motion of the orbiting scroll, and the oil is directly supplied to the stepped portion. Therefore, an oil film can be formed on the contact surface in the step portion, and the gap in the step portion can be reduced. Thereby, the sealing degree of a compression chamber can be raised and compression efficiency can be improved efficiently.

  In the scroll compressor according to the next invention, the oil supply portion intermittently communicates with the oil supply means during one turning motion of the orbiting scroll, thereby intermittently supplying oil to the stepped portion. It is characterized by being.

  According to the present invention, the oil supply means and the oil supply portion are intermittently communicated during one turning motion of the orbiting scroll, so that oil can be supplied to the stepped portion only during a period when oil supply is necessary, and oil supply is required. Refueling can be stopped during periods that are not. Thereby, it can prevent supplying excess oil to a compression chamber, and can improve compression efficiency efficiently.

  In the scroll compressor according to the next invention, oil is supplied from the oil supply means to the step portion during at least a part of a period in which the step portion of the fixed scroll and the step portion of the orbiting scroll are engaged with each other. Features.

  According to this invention, during one turning motion of the orbiting scroll, oil can be supplied at least during a period in which the step portion is engaged, and a gap generated in the step portion can be effectively sealed. Thereby, the refrigerant | coolant leak from a compression chamber can be suppressed.

  The scroll compressor according to the next invention is characterized in that the oil supply means supplies oil from an oil supply hole provided in the stepped portion.

  According to this invention, by providing the oil supply hole in the step portion of the scroll, oil can be supplied to the step portion, so that the step portion in which the fixed scroll and the orbiting scroll mesh can be effectively sealed. Thereby, the sealing degree of a compression chamber can be raised and compression efficiency can be improved.

  In the scroll compressor according to the next invention, the oil supply hole is provided at a tooth tip of a lap of the fixed scroll and the orbiting scroll.

  According to the present invention, since the oil supply hole is provided in the tooth tip of the wrap of the fixed scroll and the orbiting scroll, it is possible to effectively suppress the compression leakage at the stepped portions that mesh with each other.

  The scroll compressor according to the next invention is characterized in that the oil supply hole is provided in a tooth bottom of a lap of the fixed scroll and the orbiting scroll.

  According to the present invention, since the oil supply hole is provided in the bottom of the lap of the fixed scroll and the orbiting scroll, it is possible to effectively suppress the compression leakage at the stepped portions that mesh with each other.

  In the scroll compressor according to the next invention, the oil supply hole is provided at a tooth tip of the fixed scroll or the orbiting scroll wrap, and is provided at a tooth bottom of the fixed scroll or the orbiting scroll. To do.

  According to the present invention, by providing the oil supply holes in the tooth tip and the tooth bottom of the step portion of the scroll, oil can be supplied to each step portion, so that the step portion in which the fixed scroll and the orbiting scroll mesh with each other is effective. Can be sealed. Thereby, the sealing degree of a compression chamber can be raised and compression efficiency can be improved.

  The scroll compressor according to the next invention is characterized in that the oil supply hole is provided on a side surface of the step portion.

  According to this invention, by providing the oil supply hole on the side surface of the step portion, it is possible to effectively seal the step portion at which the fixed scroll and the orbiting scroll mesh with each other.

  An air conditioner according to the next invention includes the scroll compressor, a condenser for condensing and liquefying the refrigerant discharged from the scroll compressor, and a low-temperature and low-pressure liquid refrigerant by decompressing and expanding the refrigerant liquefied by the condenser. And an evaporator that exchanges heat between the low-temperature and low-pressure liquid refrigerant that has passed through the expansion valve and the air.

  According to this invention, since the compression leakage in the scroll compressor can be efficiently suppressed, the compression efficiency can be improved, and the air conditioning capability of the air conditioner can be improved.

  According to the scroll compressor and the air conditioner according to the present invention, by supplying oil to the stepped portion and sealing it, the gap generated in the stepped portion can be reduced, and the compression leakage at the time of compression is efficiently reduced. can do. Thereby, compression efficiency can be improved.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited to the best mode for carrying out the invention. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

  FIG. 1 is a diagram showing an overall configuration of a scroll compressor according to the present invention. The scroll compressor 1 is a so-called high pressure housing type scroll compressor in which the inside of the housing 2 is in a high pressure atmosphere. This scroll compressor has a fixed scroll 3 fixed to the housing 2 and a orbiting scroll 4 supported in the housing 2 so as to be capable of revolving.

  An oil reservoir 8 is provided at the bottom of the scroll compressor 1, and the oil stored in the oil reservoir 8 is supplied to the bearing 10 and the like through the shaft 9 so that the bearing 10 and the like are provided. Lubricated. Further, on the back surface of the orbiting scroll 4, there are provided an oil reservoir portion 6 for accumulating oil supplied through the shaft 9 and an Oldham link 7 as an anti-rotation mechanism for preventing the orbiting scroll 4 from rotating. . Further, a back pressure seal 5 is provided between the oil reservoir 6 and the Oldham link 7 to partition them. In addition, an oil separator 11 that separates the compressed refrigerant and the oil contained in the refrigerant is disposed on the upper portion of the fixed scroll 3, and the oil separated by the oil separator 11 is stored again. Returned to part 8.

  Next, the refrigeration cycle in the air conditioner using the scroll compressor 1 will be described. FIG. 2 is a refrigerant circuit diagram of an air conditioner to which the scroll compressor 1 according to the present invention is applied. The scroll compressor 1 compresses the refrigerant and sends it to the capacitor 100 as a high-temperature and high-pressure gas refrigerant. The condenser 100 cools the high-temperature and high-pressure gas refrigerant supplied from the scroll compressor 1 by releasing heat to the outside air, and condenses and liquefies the gas refrigerant. The refrigerant liquefied by the condenser 100 is sent to the expansion valve 200, and is decompressed and expanded by the expansion valve 200 to be converted into a low-temperature and low-pressure liquid refrigerant and supplied to the evaporator 300. The evaporator 300 heat-exchanges this low-temperature and low-pressure liquid refrigerant and air to cool the air.

  Next, the shapes of the fixed scroll 3 and the orbiting scroll 4 of the scroll compressor 1 according to the present invention will be described. FIG. 3 is a diagram showing the fixed scroll 3 according to the present invention, and FIG. 4 is a diagram showing the orbiting scroll 4 according to the present invention.

  The fixed scroll 3 shown in FIG. 2 includes an end plate 12 and a spiral wrap 13 erected on the end plate 12. Further, the orbiting scroll 4 shown in FIG. 3 includes an end plate 14 and a spiral wrap 15 erected on the end plate 14. The spiral wraps 13 and 15 of the fixed scroll 3 and the orbiting scroll 4 each have inner and outer walls formed by involute curves generated from the base circle.

  The fixed scroll 3 and the orbiting scroll 4 are arranged in combination in a state in which the phases of the spiral wraps 13 and 15 are shifted by 180 degrees and are shifted by a predetermined distance with respect to the radial direction of the scroll. The orbiting scroll 4 is connected to a shaft 9 connected to a power source, revolves with respect to the fixed scroll 3, and gradually reduces the volume of a plurality of compression chambers formed between the spiral wraps 13 and 15. The fluid in the compression chamber is compressed.

  As shown in FIG. 2, the fixed scroll 3 includes a spiral wrap 13 erected on one side surface of the end plate 12. The upper edge of the spiral wrap 13 (hereinafter referred to as the tooth tip) has a step portion 16 on the tooth tip side in the middle from the center in the spiral direction to the outer peripheral end side. That is, the tooth tip has a stepped shape in which the center side in the vortex direction is formed as a low portion 17 having a low height and the outer peripheral end side is formed as a high portion 18 having a high height.

  Similarly, one side surface of the end plate 12 (hereinafter referred to as a tooth bottom) has a step portion 19 on the tooth bottom side on the way from the center side in the vortex direction to the outer peripheral end side. That is, the center side in the spiral direction is formed as a high portion 20 having a high height, and the outer peripheral end side has a stepped shape formed as a low portion 21 having a low height. Moreover, in the step part 16 on the tooth tip side, the low part 17 and the high part 18 are connected by a step part side surface 22 as a connection edge. Similarly, in the step portion 19 on the tooth bottom side, the low portion 21 and the high portion 20 are connected by a step portion side surface 23 as a connection edge.

  Further, a concave groove is formed in the tooth tip of the spiral wrap 13, and a chip seal 24 a is fitted into the groove as a seal member for ensuring the airtightness of the compression chamber. The tip seal 24a is divided into two parts, one from the center in the vortex direction to the front of the step 16 on the tooth tip side and one from the rear of the step 16 on the tooth tip side toward the outer peripheral end 25. That is, there is a break in the tip seal 24a in the step portion 16. Therefore, the step 16 on the tooth tip side means at least a region between the cuts of the tip seal 24a. Similarly, the step portion 19 on the tooth bottom side refers to a region corresponding to the cut of the tip seal 24a in the step portion on the tooth tip side that meshes with the step portion 16 on the tooth bottom side.

  Next, the shape of the orbiting scroll 4 will be described. The orbiting scroll 4 has a spiral wrap 15 erected on one side surface of the end plate 14 like the above-described fixed scroll. The tooth tip of the spiral wound wrap 15 has a step portion 26 on the tooth tip side in the middle from the center in the spiral direction to the outer peripheral end side. That is, the tooth tip has a stepped shape in which the center side in the vortex direction is formed as a low portion 27 having a low height and the outer peripheral end side is formed as a high portion 28 having a high height.

  Similarly, the tooth bottom of the end plate 14 has a step portion 29 on the tooth bottom side in the middle from the center in the vortex direction to the outer peripheral end. That is, the center side in the spiral direction is formed as a high portion 30 having a high height, and the outer peripheral end side has a stepped shape formed as a low portion 31 having a low height. Further, in the step portion 26 on the tooth tip side, the low portion 27 and the high portion 28 are connected by a step portion side surface 32 as a connecting edge. Similarly, in the step portion 29 on the tooth bottom side, the low portion 31 and the high portion 30 are connected by a step portion side surface 33 as a connection edge.

  Further, a concave groove is formed at the tooth tip of the spiral wrap 15, and a chip seal 24 b is fitted into the groove as a seal member for ensuring the airtightness of the compression chamber. The tip seal 24 b is divided into two parts, one from the center in the vortex direction to the front of the step part 32 on the tooth tip side, and one from the rear of the step part 32 on the tooth tip side toward the outer peripheral end 34. That is, there is a break in the tip seal 24b in the step portion 32. Therefore, the step part 32 on the tooth tip side means at least a region between the cuts of the tip seal 24b. Similarly, the step portion 33 on the tooth bottom side refers to a region corresponding to the cut of the tip seal 24b in the step portion on the tooth tip side that meshes with the step portion 33 on the tooth bottom side.

  By engaging the fixed scroll 3 and the orbiting scroll 4 with each other, the step portion 19 of the end plate 12 of the fixed scroll 3 is engaged with the high portion 28 of the step 32 of the lap 15 tooth tip of the orbiting scroll 4. The step 29 in the end plate 14 of the scroll 4 is engaged with the high portion 18 of the step 16 on the wrap 13 tooth tip side of the fixed scroll, thereby forming a sealed compression chamber.

  Next, the structure of the steps 16 and 19 of the fixed scroll will be described. FIG. 5 is an enlarged view showing the step 16 on the tooth tip side of the wrap 13 of the fixed scroll 3, and FIG. 6 is an enlarged view showing the step 19 on the tooth bottom side of the end plate 12 of the fixed scroll 3. .

  An oil supply hole 35 as an oil supply means is provided in the wrap tooth tip of the step 16 on the tooth tip side. Specifically, it is preferably provided at the position of the tip of the tip seal 24a in the step 16 on the tooth tip side, which is the lower tip of the wrap. The oil supply hole 35 communicates with the oil supply passage 36a. An oil supply hole 37 is also provided on the side surface 22 of the step portion, and the oil supply hole 37 is also in communication with the oil supply passage 36a. Further, an oil supply hole 38 as shown in FIG. 6 is also provided in the step portion 19 on the tooth bottom side of the end plate 12 of the fixed scroll 3. Specifically, it is preferable to provide at the position of the tooth tip with the higher wrap height. The oil supply hole 38 communicates with the oil supply passage 36a. An oil supply hole 39 is also provided in the stepped side surface 23, and the oil supply hole 39 is also in communication with the oil supply passage 36a.

  Next, the structure of the back pressure seal 5 will be described with reference to FIGS. FIG. 7 is a view showing the structure of the back pressure seal 5 of the present embodiment, and is an enlarged view of A in FIG. FIG. 8 is an AA arrow view in FIG. An oil supply portion 40 that communicates with the oil sump portion 6 is formed on a sliding surface that contacts the end plate 14 of the orbiting scroll 4 of the back pressure seal 5 that is a contact member that contacts the orbiting scroll 4. The oil supply unit 40 is formed in a groove shape on the surface of the back pressure seal 5 that is in contact with the end plate 14 of the orbiting scroll 4. The oil supply unit 40 communicates with an oil reservoir 6 provided inside the back pressure seal 5 and is filled with oil supplied from the oil reservoir 6. In addition, the shape of this oil supply part 40 is not restricted to groove shape, You may form a hollow in spherical shape.

  Next, the flow of oil during operation of the scroll compressor 1 configured as described above will be described. An oil supply passage 36 a provided in the orbiting scroll 4 and communicating with the oil supply holes 35 and 37 has an opening 41 a on the back surface of the end plate 14 of the orbiting scroll 4 on the back pressure seal 5 side. When the orbiting scroll 4 performs the orbiting motion, as shown in FIG. 8, the opening 41a of the oil supply passage 36a opens with respect to the oil refueling portion 40 only for a certain period in one orbiting movement, and the back pressure is applied in the other periods It is blocked by the surface of the seal 5. That is, when the opening 41 a opens with respect to the oil supply unit 40, the period during which the oil supply passage 36 a communicates with the oil supply unit 40 is limited during one turning motion of the orbiting scroll 4.

  Specifically, the step portions 16 and 19 of the fixed scroll 3 and the step portions 26 and 29 of the orbiting scroll 4 start to mesh with each other, and the opening portion 41a of the oil supply passage 36a opens to the oil supply portion 40, and the fixed scroll. The position of the opening 41 is determined such that the opening 41 of the oil supply passage 36 a is closed by the back pressure seal 5 when the meshing between the stepped portions 3 and 4 is completed. As described above, the oil supply passage 36 a and the oil supply unit 40 are intermittently connected to each other, so that oil can be intermittently supplied to the steps of the fixed scroll 3 and the orbiting scroll 4. As a result, the stepped portions of the fixed scroll 3 and the orbiting scroll 4 are engaged with each other, and oil can be supplied to the stepped portion only when it is necessary to prevent compression leakage from the compression chamber. And when the step part is not meshing, it can prevent supplying excess oil in a compression chamber. Thereby, the quantity of the oil which flows out into a refrigerant circuit can be reduced, and the compression leak from a step part can be suppressed, suppressing the fall of refrigerating capacity.

  In the above-described embodiment, the wrap 13 of the fixed scroll 3 and the steps 16 and 19 of the end plate 12 are provided with the oil supply means. However, the wrap 15 of the orbiting scroll 4 and the steps of the end plate 14 are supplied with oil. Even if the means is provided, the effect of suppressing the compression leakage from the stepped portion can be obtained. That is, an oil supply hole may be formed in at least one step portion of the fixed scroll 3 or the orbiting scroll 4. Alternatively, an oil supply hole may be provided in the step portion of the tooth tip of the fixed scroll 3 and the step portion 26 of the tooth tip of the orbiting scroll 4, and oil may be supplied from the tooth tip side to the step portion of the other tooth bottom. Similarly, the effect of suppressing the compression leakage from the stepped portion can be obtained even if the oil supply hole is provided in the stepped portion on each tooth bottom side. In addition, even if the oil supply hole is provided in either the fixed scroll or the orbiting scroll, there is no effect on the intermittent communication between the oil supply passage and the oil supply part. An effect of preventing excess oil from being supplied into the compression chamber can be obtained.

  Next, a second embodiment of the present invention will be described. The scroll compressor according to the second embodiment has substantially the same configuration as the scroll compressor according to the first embodiment, but the structure of the oil supply section is different. Since other configurations are the same as those of the first embodiment, the description thereof is omitted and the same components are denoted by the same reference numerals.

  FIG. 9 is a diagram showing the configuration of the oil supply unit according to the second embodiment of the present invention, and FIG. 10 is a cross-sectional view taken along the line BB in FIG. The oil supply section 42 of the present embodiment is provided on the end plate 12 of the fixed scroll 3 that is a contact member that contacts the orbiting scroll 4. Specifically, as shown in FIG. 9, a counterbore-shaped oil supply section 42 is provided on a portion of the end plate 12 of the fixed scroll 3 that is in contact with the end plate 14 of the orbiting scroll 4. The oil supply portion 42 communicates with an oil supply passage 36 b that is connected to the tooth tip or the tooth bottom of the fixed scroll 3. Further, the oil supply section 42 is an oil supply path provided in the end plate 14 of the orbiting scroll 4 and communicates with an oil supply path 36 c whose one end is open to the oil reservoir 6 only during a certain period in one orbiting motion of the orbiting scroll 4. It has a structure to do. That is, as shown in FIG. 10, the orbiting scroll side opening 41b of the oil supply passage 36c also orbits together with the orbiting motion of the orbiting scroll 4, and the oil supply passage 36c and the oil only during a certain period of one orbiting motion of the orbiting scroll 4. The oil supply unit 42 communicates. Thereafter, the fixed scroll side opening 41 b is moved by the further turning motion of the orbiting scroll 4 and is closed by the end plate of the fixed scroll 3. Thereby, the communication between the oil supply portion 42 and the oil supply passage 36c is released.

  When the opening 41b opens to the oil supply section 42 and the oil supply passage 36c and the oil supply section 42 communicate with each other, oil is supplied from the oil reservoir 6 through the oil supply passage 36c to the oil supply section 42. Then, the oil supplied to the oil supply section 42 is supplied to the tooth tip or the tooth bottom of the fixed scroll 3 through the oil supply passage 36b. Further, when the oil supply passage 36c and the oil supply portion 42 are not in communication, the oil supply is not performed. Thereby, oil can be supplied into the compression chamber only during a period in which refueling is necessary, and refueling can be stopped when refueling is not necessary.

  Specifically, at the same time as the stepped portion of the fixed scroll 3 and the stepped portion of the orbiting scroll 4 begin to engage, the opening 41b of the oil supply passage 36c opens to the oil supply portion 42, and the engagement between the steps ends. The position of the opening 41b is determined so that the opening 41b of the oil supply passage 36c is sometimes blocked by the end plate 12 of the fixed scroll 3. As described above, the oil supply passage 36c and the oil supply portion 42 are intermittently connected to each other, so that oil can be intermittently supplied to the step portions of the fixed scroll 3 and the orbiting scroll 4. As a result, the stepped portions of the fixed scroll 3 and the orbiting scroll 4 mesh with each other, and oil can be supplied to the stepped portions only when it is necessary to prevent compression leakage from the compression chamber. It is possible to prevent the oil from being supplied into the compression chamber. Thereby, the quantity of the oil which flows out into a refrigerant circuit can be reduced, and the compression leak from a step part can be suppressed, suppressing the fall of refrigerating capacity.

  Next, a third embodiment of the present invention will be described. The scroll compressor according to the second embodiment is different from the above-described embodiment in that it is a so-called low pressure housing type scroll compressor in which the inside of the housing has a low pressure atmosphere.

  FIG. 11 is a diagram showing a scroll compressor according to a third embodiment of the present invention. The scroll compressor 43 is a so-called low pressure housing type scroll compressor in which the housing 44 has a low pressure atmosphere. This scroll compressor 43 has the fixed scroll 3 fixed in the housing 44 and the orbiting scroll 4 supported so as to be able to revolve like the high pressure housing type scroll compressor 1 described above.

  An oil reservoir 8 is provided at the bottom of the scroll compressor 43, and the oil stored in the oil reservoir 8 is supplied to the bearing 10 and the like through the shaft 9, so that the bearing 10 and the like are provided. Lubricated. A thrust bearing 45 that supports the orbiting scroll 4 and an Oldham link 7 as a rotation preventing mechanism that prevents the orbiting scroll 4 from rotating are provided on the back of the orbiting scroll 4. In addition, an oil separator 11 that separates the compressed refrigerant and the oil contained in the refrigerant is disposed on the upper portion of the fixed scroll 3, and the oil separated by the oil separator 11 is stored in an oil reservoir portion. Return to 46.

  The thrust bearing 45 supports the orbiting scroll 4 and is in contact with the back surface of the end plate 14 of the orbiting scroll 4. The orbiting scroll 4 slides on the thrust bearing 45 and performs the orbiting motion. A thrust bearing 45, which is a contact member that comes into contact with the orbiting scroll, is provided with a counterbore-shaped oil supply section 47. FIG. 12 is a view showing an oil supply portion 47 provided in the thrust bearing 45. The oil supply portion 47 provided in the thrust bearing 45 communicates with an oil supply passage 36 e having one end opened to the oil reservoir portion 46. The oil in the oil reservoir 46 passes through the oil supply passage 36e and is supplied to the oil supply part 47, and the oil supply part 47 is filled with oil.

  The oil supply portion 47 is an oil supply passage provided in the end plate 14 of the orbiting scroll 4, and one end of the oil supply portion 47 opens into an oil supply hole provided in a stepped portion of the tooth tip and a stepped portion of the tooth bottom. The passage 36d is structured to communicate only for a certain period in one turning motion of the turning scroll 4. That is, the thrust bearing side opening 41c of the oil supply passage 36d also makes a turning motion together with the turning motion of the turning scroll 4, and the oil supply passage 36d and the oil supply portion 47 communicate with each other only for a certain period of one turning motion of the turning scroll 4. . Thereafter, the thrust bearing side opening 41 c is moved by the further turning motion of the orbiting scroll 4 and is blocked by the upper surface of the thrust bearing 45. Thereby, the communication between the oil supply section 47 and the oil supply passage 36d is released.

  The oil separated by the oil separator 11 and collected in the oil reservoir 46 is at a high pressure because it is after being compressed in the compression chamber. On the other hand, the step portion of the orbiting scroll 4 is at the intermediate pressure between the low pressure and the high pressure because it is in the compression process position. Therefore, when the opening 41c opens to the oil supply portion 47 and the oil supply passage 36d and the oil supply portion 47 communicate with each other, the oil supply portion 47 passes through the oil supply passage 36d due to the pressure difference between the high pressure and the intermediate pressure. Thus, oil is supplied to the step portion of the orbiting scroll 4. Further, when the oil supply passage 36d and the oil supply portion 47 are not in communication, the oil supply is not performed. Thereby, oil can be supplied into the compression chamber only during a period in which refueling is necessary, and refueling can be stopped when refueling is not necessary.

  Specifically, as soon as the stepped portion of the fixed scroll 3 and the stepped portion of the orbiting scroll 4 begin to engage, the opening 41c of the oil supply passage 36d opens to the oil supply portion 47, and the engagement between the steps ends. The position of the opening 41c is determined so that the opening 41c of the oil supply passage 36d is sometimes blocked by the thrust bearing 45. As described above, the oil supply passage 36d and the oil supply portion 47 are intermittently communicated, whereby oil can be intermittently supplied to the step portions of the fixed scroll 3 and the orbiting scroll 4. As a result, the stepped portions of the fixed scroll 3 and the orbiting scroll 4 are engaged with each other, and oil can be supplied to the stepped portion only when it is necessary to prevent the compression leakage from the compression chamber. It is possible to prevent oil from being supplied into the compression chamber. Thereby, the quantity of the oil which flows out into a refrigerant circuit can be reduced, and the compression leak from a step part can be suppressed, suppressing the fall of refrigerating capacity.

  In the description of the present embodiment, the oil separator 11 is incorporated in the scroll compressor, but is not limited thereto. That is, the same effect as that of the present embodiment can also be obtained by providing an oil separator outside the scroll compressor and connecting the oil return passage to the oil supply section 47.

  In addition, the start and end timings of communication between the oil supply passage and the oil supply unit during one orbiting motion of the orbiting scroll 4 are the timing of the start and end of engagement between the stepped portion of the fixed scroll 3 and the stepped portion of the orbiting scroll 4. They may not be the same, and it is sufficient that oil is supplied to the step when the step of the fixed scroll 3 and the step of the orbiting scroll 4 are engaged. Further, it is sufficient that oil is supplied from the oil supply means to the step portion during at least a part of the period in which the step portion of the fixed scroll and the step portion of the orbiting scroll are engaged. The oil supply passage and the oil supply unit may be communicated immediately before the stepped portions are engaged with each other. As a result, it is possible to adjust the time delay from the start of communication between the oil supply passage and the oil supply portion until the oil is supplied to the stepped portion. Further, the oil supply passage and the oil supply portion may be communicated with each other immediately before the step portions are engaged with each other, and the communication may be terminated in the middle of the engagement. In this way, when the stepped portion is engaged, the spiral scroll wrap of the orbiting scroll performs a turning motion while scraping off the oil supplied to the stepped portion, so that oil was supplied when the stepped portion started to engage. The step can be sufficiently sealed with only oil. Thereby, the compression leakage from the step portion can be effectively suppressed while preventing excessive supply of oil into the compression chamber.

  Furthermore, the communication timing and communication period between the oil supply passage and the oil supply unit can be changed by appropriately decentering the member provided with the oil supply unit. That is, the timing and distance at which the opening of the oil supply passage passes through the oil supply part may be changed by shifting the position of the oil supply part.

It is a figure showing the whole scroll compressor composition concerning the present invention. It is a refrigerant circuit figure of the air harmony device concerning the present invention. It is a perspective view which shows the fixed scroll which concerns on this invention. It is a perspective view which shows the turning scroll which concerns on this invention. It is an enlarged view which shows the step part in the tooth tip of the fixed scroll which concerns on this invention. It is an enlarged view which shows the step part in the end plate of the fixed scroll which concerns on this invention. It is a figure which shows the oil supply part in the 1st Example of this invention. It is an AA cross-sectional arrow view in FIG. It is a figure which shows the oil supply part in the 2nd Example of this invention. It is a BB cross-sectional arrow view in FIG. It is a figure which shows the whole structure of the scroll compressor which concerns on 3rd Example of this invention. It is a figure which shows the oil supply part in the 3rd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,43 Scroll compressor 3 Fixed scroll 4 Orbiting scroll 5 Back pressure seal 36a, 36b, 36c, 36d Oil supply passage 37, 38 Oil supply hole 40, 42, 47 Oil supply part 41a, 41b, 41c Opening part 45 Thrust bearing 100 Capacitor 200 expansion valve 300 evaporator

Claims (10)

In the scroll compressor in which the fixed scroll and the orbiting scroll in which a spiral wrap is erected on one side surface of each end plate are engaged with each other to form a compression chamber,
The fixed scroll and the orbiting scroll wrap have an upper edge forming a tooth tip, and the tooth tip has a step portion on the tooth tip side, so that the height differs in the vortex direction,
One side surface of the end plate of the fixed scroll and the orbiting scroll forms a tooth bottom, and a step on the tooth bottom side is formed on the tooth bottom.
At least one of the fixed scroll or the orbiting scroll is provided with oil supply means for supplying oil to the stepped portion,
One surface of a contact member that contacts the orbiting scroll and a portion that contacts the orbiting scroll to form a sliding surface when the orbiting scroll makes a revolving motion, or one surface of the orbiting scroll that contacts the contact member. And at least one of the parts forming the sliding surface is provided with an oil supply part connected to the oil supply means ,
The oil supply section intermittently supplies oil to the stepped portion only during a certain period during one turning movement by intermittently communicating with the oil supply means during one turning movement of the turning scroll. Is,
Wherein the step portion of the fixed scroll and at least a portion of the period of the step portion and engages period of the orbiting scroll, the scroll compressor according to claim Rukoto oil is supplied from the oil supply means to the stepped portion.   The scroll compressor according to claim 1, wherein the contact member is an end plate of the fixed scroll.   The scroll compressor according to claim 1, wherein the contact member is a back pressure seal disposed on a rear surface of the end plate of the orbiting scroll.   The scroll compressor according to claim 1, wherein the contact member is a thrust bearing that supports the orbiting scroll. The scroll compressor according to any one of claims 1 to 4 , wherein the oil supply means supplies oil from an oil supply hole provided in the stepped portion. The scroll compressor according to claim 5 , wherein the oil supply hole is provided at a tooth tip of a lap of the fixed scroll and the orbiting scroll. The scroll compressor according to claim 5 , wherein the oil supply hole is provided in a tooth bottom of a lap of the fixed scroll and the orbiting scroll. 6. The scroll compression according to claim 5 , wherein the oil supply hole is provided at a tooth tip of a lap of the fixed scroll or the orbiting scroll, and is provided at a tooth bottom of the fixed scroll or the orbiting scroll. Machine. The scroll compressor according to any one of claims 5 to 8 , wherein the oil supply hole is provided on a side surface of the step portion. A scroll compressor according to any one of claims 1 to 9 ,
A condenser for condensing and liquefying the refrigerant discharged from the scroll compressor;
An expansion valve that decompresses and expands the refrigerant liquefied by the condenser to form a low-temperature and low-pressure liquid refrigerant;
An evaporator for exchanging heat between the low-temperature and low-pressure liquid refrigerant that has passed through the expansion valve and the air;
An air conditioner comprising:

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