Scroll Compressor

Abstract

To provide a scroll-type compressor in which the inside of a boss part that is provided at an end plate part of a movable scroll member and accommodates a bearing or the like can be satisfactorily lubricated while suppressing increases in manufacturing costs.SOLUTION: A scroll-type compressor in which a boss part 32 has a bottomed hole 321, the boss part being provided so as to protrude toward the back surface of an end plate part 3a of a movable scroll member 3 that engages with a fixed scroll member 2. A drive bushing and a drive bearing constituting a portion of a drive mechanism for causing gyrating movement of the movable scroll member 3 are accommodated in the bottomed hole 321. An intake port 11 for introducing a refrigerant containing a lubricating oil into a housing from the outside and the surrounding space of the boss part 32 communicate with each other via an autorotation prevention mechanism for preventing autorotation of the movable scroll member 3. At least one communication path 51 for communicating the surrounding space of the boss part 32 and a space on the bottom surface 321a side of the bottomed hole 321 is formed in the boss part 32.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a scroll compressor configured to compress a refrigerant by changing the volume of an enclosed space formed by a fixed scroll member and a movable scroll member, and more particularly to a lubrication structure for a drive mechanism that causes the movable scroll member to orbit. [Background technology]

[0002] An example of a conventional scroll compressor is described in Patent Document 1. In the scroll compressor described in Patent Document 1, a boss portion is formed on the surface of the end plate portion of the movable scroll member opposite the surface on the fixed scroll side, and is rotatably supported by an eccentric shaft portion of the drive shaft. The boss portion has a cup-like shape with a bottom, and the internal space of the boss portion forms a bearing box that houses a bearing.

[0003] Here, the bearing box (i.e., the inside of the boss portion) is a dead-end passage, which may result in poor lubrication of the bearings and other components housed therein. To prevent this, in the scroll compressor described in Patent Document 1, a communication passage is formed in the end plate of the movable scroll member, which directly connects the bottom of the bearing box with the suction chambers on the outer peripheries of the movable scroll member and the fixed scroll member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-27983 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the scroll compressor described in Patent Document 1, the communication passages are formed by drilling holes in the radial direction in the end plate of the movable scroll member, which inevitably results in long holes, which require time and effort for processing, and high manufacturing costs.

[0006] Therefore, an object of the present invention is to provide a scroll compressor that can effectively lubricate the inside of a boss portion that is provided on the end plate portion of a movable scroll member and that houses bearings, etc., while suppressing increases in manufacturing costs. [Means for solving the problem]

[0007] According to one aspect of the present invention, there is provided a scroll compressor comprising: a fixed scroll member; a movable scroll member meshing with the fixed scroll member to form a sealed space between the fixed scroll member and the movable scroll member; a drive mechanism for orbiting the movable scroll member; a rotation-preventing mechanism for preventing rotation of the movable scroll member; and a housing that accommodates the fixed scroll member, the movable scroll member, the drive mechanism, and the rotation-preventing mechanism and that is provided with a suction port for introducing a refrigerant containing lubricating oil from an outside into the housing and a discharge port for discharging the refrigerant compressed in the sealed space by the orbiting movement of the movable scroll member to the outside. In the scroll compressor, the drive mechanism includes a rotating shaft having a main shaft portion that is rotated, a large-diameter shaft portion that is coaxially connected to the main shaft portion, and a crank pin that protrudes from an eccentric position on an end face of the large-diameter shaft portion, a drive bushing having an insertion hole into which the crank pin is inserted, a boss portion that protrudes from the back surface of the end plate portion of the movable scroll member and has a bottomed hole that accommodates the drive bushing, and a drive bearing that is accommodated in the bottomed hole together with the drive bushing and rotatably supports the drive bushing. In the scroll compressor, the suction port and a surrounding space of the boss portion are connected via the rotation-preventing mechanism, and the boss portion has a shaft that communicates with the surrounding space of the boss portion and the inside of the bottomed hole. multiple A communication path is formed. Each of the plurality of communicating passages has one end opening to the outer surface of the boss portion and the other end opening to the bottom surface of the bottomed hole, and each of the plurality of communicating passages is formed so that one end is located within the range of the extension line of the suction port into the housing, regardless of the rotational angle position of the movable scroll member. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a scroll compressor that can effectively lubricate the inside of a boss portion that is provided on the end plate portion of a movable scroll member and that houses a bearing or the like, while suppressing an increase in manufacturing costs. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic vertical cross-sectional view of a scroll compressor according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view of a main part of FIG. 1 taken along line AA. [Figure 3] FIG. 2 is a view of the movable scroll member as seen from the rear side of the end plate portion. [Figure 4] FIG. 4 is an enlarged view of the cross section BB of FIG. [Figure 5] 2 is a diagram showing the positional relationship between the suction port and a communication passage formed in the boss portion of the movable scroll member, and corresponds to the CC cross section of FIG. 1. FIG. [Figure 6] 10A and 10B are diagrams showing modified examples of communication passages formed in the boss portion; DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0011] FIG. 1 is a schematic longitudinal sectional view of a scroll compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main portion taken along line AA in FIG. 1. The scroll compressor 1 according to the embodiment is incorporated into a refrigerant circuit of, for example, a vehicle air conditioner, and is used to compress a refrigerant. The refrigerant contains lubricating oil. In the following description, the left and right sides of FIG. 1 correspond to the front and rear of the scroll compressor.

[0012] The scroll compressor 1 includes a fixed scroll member 2, a movable scroll member 3, a drive mechanism 4, a rotation-preventing mechanism 5, and a housing 6 that accommodates these components.

[0013] The fixed scroll member 2 and the movable scroll member 3 are arranged facing each other in the front-to-rear direction within the housing 6. Specifically, in this embodiment, the fixed scroll member 2 is fixed to the housing 6 at the rear side within the housing 6, and the movable scroll member 3 is arranged in front of the fixed scroll member 2.

[0014] Fixed scroll member 2 includes a circular end plate portion 2a and a spiral wrap 2b integrally formed on one surface of end plate portion 2a. Similarly, movable scroll member 3 includes a circular end plate portion 3a and a spiral wrap 3b integrally formed on one surface of end plate portion 3a.

[0015] The fixed scroll member 2 and the movable scroll member 3 are arranged in a combined manner such that the spiral wraps 2b, 3b are offset from each other in the circumferential direction and the side surfaces of the spiral wraps 2b, 3b are in partial contact with each other. In other words, the fixed scroll member 2 and the movable scroll member 3 are arranged so that the spiral wraps 2b, 3b mesh with each other. The tip of the spiral wrap 2b of the fixed scroll member 2 contacts the inner surface of the end plate 3a of the movable scroll member 3 (the surface on which the spiral wrap 3b is formed) via a tip seal, and the tip of the spiral wrap 3b of the movable scroll member 3 contacts the inner surface of the end plate 2a of the fixed scroll member 2 (the surface on which the spiral wrap 2b is formed) via a tip seal. As a result, a crescent-shaped sealed space 7 is formed between the fixed scroll member 2 (the spiral wrap 2b) and the movable scroll member 3 (the spiral wrap 3b), as shown in FIG. 2 .

[0016] An intake port 11 is provided on the outer wall of the housing 6 for introducing refrigerant containing lubricating oil from the outside into the housing 6. The intake port 11 is connected to an intake chamber 12 located radially outside the fixed scroll member 2 and the movable scroll member 3.

[0017] The movable scroll member 3 is driven to orbit by a drive mechanism 4. The movable scroll member 3 is prevented from rotating on its own axis by a rotation-preventing mechanism 5.

[0018] When the movable scroll member 3 orbits, the sealed space 7 moves from the outer peripheral end of the spiral wraps 2b, 3b toward the center, and the volume of the sealed space 7 decreases. As a result, the refrigerant introduced through the suction port 11 and guided to the suction chamber 12 is drawn into the sealed space 7 from the outer peripheral side of the spiral wraps 2b, 3b and compressed. The refrigerant compressed in the sealed space 7 is discharged from a discharge hole 13 formed in the center of the end plate 2a of the fixed scroll member 2 into a discharge chamber 14, and from there is discharged to the outside via a discharge port 15. Note that a portion of the refrigerant containing lubricating oil introduced into the housing 6 from the suction port 11 is used to lubricate the drive mechanism 4.

[0019] The drive mechanism 4 includes a rotary shaft 20 and a crank mechanism 30 .

[0020] The rotating shaft 20 has, from the front side to the rear side, a main shaft portion 21, a large diameter shaft portion 22, and a crank pin 23. The rotating shaft 20 is accommodated in the housing 6 with the front end of the main shaft portion 21 exposed to the outside of the housing 6. The main shaft portion 21 extends rearward within the housing 6 from the front end. The large diameter shaft portion 22 is provided at the rear end of the main shaft portion 21. The large diameter shaft portion 22 is formed to have a larger diameter than the main shaft portion 21 and is coaxially connected to the main shaft portion 21. The crank pin 23 is formed to have a smaller diameter than the large diameter shaft portion 22 and protrudes rearward from an eccentric position on the end face of the large diameter shaft portion 22, i.e., a position on the end face of the large diameter shaft portion 22 that is offset from the axis L of the main shaft portion 21 and the large diameter shaft portion 22.

[0021] The rotating shaft 20 is rotatably supported by the housing 6 via a first bearing 24 and a second bearing 25. Specifically, in this embodiment, the rotating shaft 20 is supported by the first bearing 24 attached to the housing 6 at the front end side of the main shaft portion 21, and by the second bearing 25 attached to the housing 6 at the large diameter shaft portion 22.

[0022] A pulley 27 is attached via an electromagnetic clutch 26 to the front end of the main shaft 21 exposed to the outside of the housing 6. Therefore, the main shaft 21, and therefore the rotating shaft 20, is rotationally driven by the rotational driving force input from the pulley 27 via the electromagnetic clutch 26.

[0023] The crank pin 23 side of the rotary shaft 20 is connected to the movable scroll member 3 via a crank mechanism 30 .

[0024] The crank mechanism 30 includes a drive bush 31 , a boss portion 32 provided so as to protrude from the rear surface of the end plate portion 3 a of the movable scroll member 3 , and a drive bearing 33 .

[0025] The drive bush 31 is formed in a disk shape and has an insertion hole 31a, into which the crank pin 23 is inserted, at a position eccentric from the center. The drive bush 31 is attached eccentrically to the crank pin 23. For this reason, the drive bush 31 is sometimes called an eccentric bush. The drive bush 31 is attached so as to be able to swing slightly relative to the crank pin 23. That is, the drive bush 31 has a restricting protrusion that protrudes forward, and is attached so as to be able to swing freely to the crank pin 23. The restricting protrusion is inserted into a restricting hole formed on the end face of the large diameter shaft portion 22, thereby limiting the range of swing. A balancer weight 34 is provided integrally with the drive bush 31.

[0026] The boss portion 32 is formed in a cylindrical shape and is capable of accommodating the drive bush 31 therein. In other words, the boss portion 32 has a bottomed hole 321 that opens at the tip end surface and accommodates the drive bush 31 therein.

[0027] The drive bearing 33 is, for example, a sliding bearing or a needle roller bearing (needle bearing), and is attached to the inner periphery of the boss portion 32, i.e., to the inner periphery of the blind hole 321, to rotatably support the drive bush 31. In other words, the drive bearing 33 is housed in the blind hole 321 of the boss portion 32 together with the drive bush 31, to rotatably support the drive bush 31.

[0028] When the main shaft portion 21 (rotating shaft 20) is driven to rotate, the rotation of the main shaft portion 21 (rotating shaft 20) is converted into the orbiting motion of the movable scroll member 3 by the crank mechanism 30. In this way, the drive mechanism 4 causes the movable scroll member 3 to orbit.

[0029] The rotation-preventing mechanism 5 is provided between a portion of the outer periphery on the back surface of the end plate portion 3a of the movable scroll member 3 and the thrust receiving surface 16 of the housing 6. In other words, the rotation-preventing mechanism 5 is disposed radially outward from the boss portion 32. In this embodiment, a known ball coupling type rotation-preventing mechanism including a plurality of balls 5a arranged at intervals in the circumferential direction is used as the rotation-preventing mechanism 5. Therefore, the space radially outward and the space radially inward of the rotation-preventing mechanism 5 are in communication via the space formed between adjacent balls 5a (inter-ball space).

[0030] Next, a lubrication mechanism for the drive mechanism 4, particularly the lubrication mechanism for the crank mechanism 30, using a refrigerant containing lubricating oil will be described.

[0031] As described above, a portion of the refrigerant containing lubricating oil introduced into the housing 6 through the suction port 11 is used to lubricate the drive mechanism 4. In this embodiment, the suction port 11 is designed to be located radially outward of the boss portion 32 that protrudes from the rear surface of the movable scroll member 3, as shown in FIG.

[0032] Here, the rotation-preventing mechanism 5 is present between the suction port 11 and the boss 32, and between the suction chamber 12 and the boss 32. However, as described above, the space radially outside and the space radially inside the rotation-preventing mechanism 5 are in communication with each other via the inter-ball space. Therefore, the suction port 11 and the space surrounding the boss 32 are in communication with each other via the inter-ball space of the rotation-preventing mechanism 5, and similarly, the suction chamber 12 and the space surrounding the boss 32 are in communication with each other via the inter-ball space of the rotation-preventing mechanism 5. In other words, the refrigerant containing the lubricating oil can also be supplied to the space surrounding the boss 32.

[0033] Fig. 3 is a view of the movable scroll member 3 as seen from the rear side of the end plate portion 3a, and Fig. 4 is an enlarged view of the cross section BB of Fig. 3. As shown in Fig. 3 and Fig. 4, in this embodiment, three communication passages 51 are formed in the boss portion 32 of the movable scroll member 3. These communication passages 51 connect the inside and outside of the boss portion 32, i.e., connect the space around the boss portion 32 with the inside of the blind bore 321. Therefore, refrigerant containing lubricating oil can be supplied to the inside of the blind bore 321, i.e., to the drive bushing 31 and drive bearing 33 housed in the blind bore 321.

[0034] In this embodiment, one end of each of the three communication passages 51 opens to the outer surface (outer peripheral surface) of the boss portion 32, and the other end opens to the bottom surface 321a of the blind hole 321 of the boss portion 32. That is, each of the three communication passages 51 directly communicates the space around the boss portion 32 with the space on the side of the bottom surface 321a of the blind hole 321. Specifically, each of the three communication passages 51 is composed of a first hole portion 511 that extends rearward from the one end that opens to the outer peripheral surface of the boss portion 32 and is inclined at an acute angle with respect to the axis L (see FIG. 1 ) of the rotating shaft 20, and a second hole portion 512 that extends from the other end that opens to the bottom surface 321a of the blind hole 321 and is connected to the vicinity of the tip of the first hole portion 511. The second hole portion 512 may extend at an angle with respect to the axis L of the rotating shaft 20, or may extend parallel to the axis L of the rotating shaft 20.

[0035] Furthermore, as shown in Figure 3, when the movable scroll member 3 is viewed from the back side of the end plate portion 3a, in other words, when the movable scroll member 3 is viewed from the tip side of the boss portion 32, the three communicating passages 51 are arranged at intervals from one another in the circumferential direction, preferably at equal angular intervals in the circumferential direction, and each of the three communicating passages 51 (the first hole portion 511 thereof) extends toward the center O of the bottom surface 321a of the bottomed hole 321.

[0036] Fig. 5 is a diagram showing the positional relationship between the suction port 11 and the three communication passages 51 formed in the boss portion 32, and corresponds to the CC cross-sectional view of Fig. 1. Fig. 5(a) shows the state in which the orbital angle of the movable scroll member 3 is 0°, Fig. 5(b) shows the state in which the orbital angle of the movable scroll member 3 is 90°, Fig. 5(c) shows the state in which the orbital angle of the movable scroll member 3 is 180°, and Fig. 5(d) shows the state in which the orbital angle of the movable scroll member 3 is 270°. Note that parts other than the fixed scroll member 2, the movable scroll member 3, and the housing 6 are omitted from Figs. 5(a) to 5(d).

[0037] 5(a) to 5(d), in this embodiment, the three communication passages 51 are designed so that, regardless of the orbital angle position of the movable scroll member 3, the one end thereof opening onto the outer surface of the boss portion 32 is located within the range of the extension line EL of the suction port 11 into the housing 6. In other words, each of the three communication passages 51 is formed so that, regardless of the orbital angle position of the movable scroll member 3, the one end thereof opening onto the outer surface of the boss portion 32 is located within the range of the extension line EL of the suction port 11 into the housing 6.

[0038] The scroll compressor 1 according to the embodiment provides the following effects.

[0039] The boss portion 32 protrudes from the back surface of the end plate portion 3a of the movable scroll member 3 and has a blind hole 321 that houses a drive bushing 31 and a drive bearing 33 that constitute part of the drive mechanism 4 that orbits the movable scroll member 3. The suction port 11, which introduces a refrigerant containing lubricating oil into the housing 6, is connected to the space around the boss portion 32 via a rotation-preventing mechanism 5 that prevents the movable scroll member 3 from rotating. The boss portion 32 is formed with three communication passages 51 that connect the space around the boss portion 32 to the inside of the blind hole 321.

[0040] Therefore, during operation of the scroll compressor 1, refrigerant containing lubricating oil is supplied to the inside of the blind hole 321, thereby providing good lubrication to the inside of the blind hole 321, i.e., the drive bush 31 and the drive bearing 33. Furthermore, because the three communicating passages 51 are formed in the boss portion 32, they are easier to process than, for example, when formed in the end plate portion 3a of the movable scroll member 3, and increases in manufacturing costs can be suppressed. Furthermore, the rigidity of the end plate portion 3a of the movable scroll member 3 is not reduced.

[0041] Furthermore, one end of each of the three communication passages 51 opens to the outer surface (outer peripheral surface) of the boss portion 32, and the other end opens to the bottom surface 321a of the bottomed hole 321. Therefore, the refrigerant containing the lubricating oil is effectively supplied to the inside of the bottomed hole 321, and the drive bush 31 and the drive bearing 33 can be lubricated more effectively.

[0042] Each of the three communication passages 51 includes a first hole portion 511 that extends rearward from the one end that opens on the outer surface of the boss portion 32 and is inclined at an acute angle with respect to the axis L of the rotating shaft 20, and a second hole portion 512 that extends from the other end that opens on the bottom surface 321a of the blind hole 321 and connects to the vicinity of the tip of the first hole portion 511. This makes it relatively easy to form the communication passages 51 in the boss portion 32 by drilling. The inclination angle of the first hole portion 511 with respect to the axis L of the rotating shaft 20, i.e., the angle formed by the axis L of the rotating shaft 20 and (the center line of) the first hole portion 511, is preferably 40° to 75°, and more preferably 45° to 70°. As described above, the suction port 11 is located radially outward from the boss portion 32. If the inclination angle of the first hole portion 511 relative to the axis L of the rotating shaft 20 is less than 40°, the refrigerant containing lubricating oil introduced into the housing 6 from the suction port 11 may have difficulty flowing into the connecting passage 51. If the inclination angle of the first hole portion 511 relative to the axis L of the rotating shaft 20 exceeds 75°, the drilling process for forming the first hole portion 511 may become difficult, for example, as it may become necessary to process the end plate portion 3a of the movable scroll member 3.

[0043] Furthermore, when the movable scroll member 3 is viewed from the tip end side of the boss portion 32, the three communicating passages 51 are arranged at intervals from one another in the circumferential direction, and the first hole portions 511 of each of the three communicating passages 51 extend toward the center O of the bottom surface 321a of the blind hole 321. This makes it possible to stably and sufficiently supply the refrigerant containing lubricating oil to the inside of the blind hole 321, i.e., to the drive bush 31 and the drive bearing 33, while also suppressing a decrease in the rigidity of the boss portion 32.

[0044] Furthermore, each of the three communication passages 51 is formed so that the one end opening to the outer surface of the boss portion 32 is located within the range of an extension line EL of the suction port 11 into the housing 6, regardless of the orbital angle position of the movable scroll member 3. This makes it possible to quickly supply refrigerant containing lubricating oil to the inside of the bottomed hole 321 when the scroll compressor 1 is started, and to continuously supply refrigerant containing lubricating oil to the inside of the bottomed hole 321 during operation of the scroll compressor 1. In other words, from the start of the scroll compressor 1 to the end of operation, refrigerant containing lubricating oil can be continuously supplied to the inside of the bottomed hole 321, i.e., to the drive bush 31 and the drive bearing 33. This contributes to improving the durability and efficiency of the scroll compressor 1.

[0045] In the above-described embodiment, a ball coupling type rotation-preventing mechanism is used as the rotation-preventing mechanism 5. However, this is not limited to this. The rotation-preventing mechanism 5 may be any mechanism that prevents the rotation of the movable scroll member 3 and that provides communication between the space on its radially outer side and the space on its radially inner side, and other configurations of rotation-preventing mechanisms may also be used.

[0046] In the above-described embodiment, the front end of the main shaft portion 21 (rotating shaft 20) is exposed to the outside of the housing 6, and the main shaft portion 21 (rotating shaft 20) is rotationally driven by a rotational driving force from an external driving source. However, this is not limited to this. The scroll compressor 1 may be configured to have a driving source such as an electric motor within the housing, and to rotate the main shaft portion 21 (rotating shaft 20) by the rotational driving force from the driving source. In this case, the entire rotating shaft 20 together with the driving source is accommodated within the housing 6.

[0047] In the above embodiment, three communication passages 51 are formed in the boss portion 32. However, this is not limited to this. It is sufficient that at least one communication passage 51 is formed, and the number and size of the communication passage 51 can be set as desired.

[0048] Furthermore, in the above-described embodiment, when the movable scroll member 3 is viewed from the tip end side of the boss portion 32, the three communicating passages 51 are arranged at intervals from one another in the circumferential direction, and each of the three communicating passages 51 is formed so as to extend from the one end opening on the outer surface of the boss portion 32 toward the center O of the bottom surface 321a of the blind hole 321. However, this is not limited thereto. It is sufficient that at least one of the three communicating passages 51 is formed so as to extend from the one end opening on the outer surface of the boss portion 32 toward the center O of the bottom surface 321a of the blind hole 321.

[0049] 6, for example, the first communication passage 51A of the three communication passages 51A to C may be formed so as to extend from the one end opening to the outer surface of the boss portion 32 toward the center O of the bottom surface 321a of the blind hole 321, and the remaining second and third communication passages 51B and 51C may be formed parallel to the first communication passage 51A. Alternatively, although not shown, the first and second communication passages 51A and 51B of the three communication passages 51A to C may be formed so as to extend from the one end opening to the outer surface of the boss portion 32 toward the center O of the bottom surface 321a of the blind hole 321, and the remaining third communication passage 51C may be formed parallel to the first communication passage 51A or the second communication passage 51B.

[0050] The above describes the embodiments of the present invention and their modifications. However, the present invention is not limited to the above-described embodiments and modifications, and it goes without saying that further modifications are possible based on the technical concept of the present invention. [Explanation of symbols]

[0051] 1...Scroll compressor, 2...Fixed scroll member, 2a...End plate portion of fixed scroll member, 2b...Spiral wrap of fixed scroll member, 3...Moving scroll member, 3a...End plate portion of movable scroll member, 3b...Spiral wrap of movable scroll member, 4...Drive mechanism, 5...Rotation prevention mechanism, 6...Housing, 7...Sealed space, 11...Suction port, 12...Suction chamber, 13...Discharge hole, 14...Discharge chamber, 15...Discharge port, 20...Rotating shaft, 21...Main shaft portion, 22...Large diameter shaft portion, 23...Crank pin, 30...Crank mechanism, 31...Drive bushing, 31a...Insertion hole, 32...Boss portion, 33...Drive bearing, 51...Communicating passage, 321...Blind hole, 321a...Bottom surface of blind hole, 511...First hole portion, 512...Second hole portion, L...Axis of rotating shaft, EL...Extension line of intake port, O...Center of bottom surface of blind hole

Claims

1. A fixed scroll member; a movable scroll member that meshes with the fixed scroll member to form an enclosed space between the movable scroll member and the fixed scroll member; a drive mechanism for orbiting the movable scroll member; a rotation prevention mechanism that prevents the movable scroll member from rotating on its axis; a housing that houses the fixed scroll member, the movable scroll member, the drive mechanism, and the rotation-preventing mechanism, and that is provided with a suction port through which a refrigerant containing lubricating oil from the outside is introduced into the housing, and a discharge port through which the refrigerant compressed in the sealed space by the orbital movement of the movable scroll member is discharged to the outside; A scroll compressor having The drive mechanism includes: a rotating shaft having a main shaft portion that is driven to rotate, a large diameter shaft portion that is coaxially connected to the main shaft portion, and a crank pin that protrudes from an eccentric position on an end face of the large diameter shaft portion; a drive bush having an insertion hole into which the crank pin is inserted; a boss portion provided on a rear surface of the end plate portion of the movable scroll member so as to protrude, the boss portion having a bottomed hole for accommodating the drive bush; a drive bearing that is accommodated in the blind hole together with the drive bush and rotatably supports the drive bush; Including, the intake port and a space surrounding the boss portion communicate with each other via the rotation-preventing mechanism, a plurality of communication passages are formed in the boss portion, the communication passages connecting a space surrounding the boss portion with the inside of the bottomed hole; each of the plurality of communication passages has one end opening to an outer surface of the boss portion and the other end opening to a bottom surface of the blind hole; each of the plurality of communication passages is formed such that the one end is located within a range of an extension line of the suction port into the housing, regardless of the orbital angular position of the movable scroll member; Scroll type compressor.

2. 2. The scroll compressor according to claim 1, wherein each of the plurality of communication passages includes a first hole portion extending from the one end at an angle with respect to the axis of the rotating shaft, and a second hole portion extending from the other end and connecting to a portion near a tip end of the first hole portion.

3. 3. The scroll compressor according to claim 1, wherein the plurality of communication passages are arranged at intervals in the circumferential direction when the movable scroll member is viewed from the tip end side of the boss portion.

4. 3. The scroll compressor according to claim 1, wherein the plurality of communication passages are formed parallel to one another when the movable scroll member is viewed from the tip end side of the boss portion.

Images