Scroll compressor

Abstract

This invention provides a scroll compressor having a cross-slip ring (17) that prevents the rotation of a rotating scroll member. The cross-slip ring (17) has an upper annular connecting passage (17d) on the axial upper surface of the annular portion (17a) that connects the inner and outer circumferences of the annular portion (17a). As a result, the contact area between the cross-slip ring (17), the bearing component in contact with the cross-slip ring (17), or the rotating scroll member is reduced, thereby reducing sliding losses. Furthermore, since the flowability of the refrigeration oil present around the cross-slip ring (17) is improved, reducing viscous resistance, a high-efficiency scroll compressor can be achieved.

Description

[0001] (This application is a divisional application of application number 202080086898.2, filed on December 8, 2020.) Technical Field

[0002] This invention relates in particular to scroll compressors used in refrigeration units of air conditioners, water heaters, or cold storage units. Background Technology

[0003] Patent Document 1 discloses a scroll compressor used in air conditioners and the like. This scroll compressor is configured to compress refrigerant by a rotating scroll component that rotates relative to a stationary scroll component. An Oldham ring is used as a mechanism to prevent the rotating scroll component from rotating. The Oldham ring slides with the bearing components and the rotating scroll component. Therefore, methods are being researched to achieve high efficiency based on reducing sliding losses, or to suppress noise caused by sliding.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2013-130101 Summary of the Invention

[0007] The technical problem that the invention aims to solve

[0008] This invention provides a scroll compressor that utilizes a cross-slip ring, further promoting high efficiency.

[0009] The vortex compression mechanism of the present invention comprises a cross slip ring having a structure that prevents the rotation of the vortex member, and the cross slip ring having a structure in which at least one of the axial upper surface or axial lower surface of the annular portion is provided with an annular portion communication path that connects the inner circumference and the outer circumference of the annular portion. Attached Figure Description

[0010] Figure 1 This is a longitudinal cross-sectional view of the scroll compressor in Embodiment 1.

[0011] Figure 2 This is a top view showing the stationary scroll component of the scroll compressor.

[0012] Figure 3 This is a rear view showing the rotating scroll component of the scroll compressor.

[0013] Figure 4 This is a top view showing the cross-shaped slip ring of the scroll compressor.

[0014] Figure 5This is a side view showing the cross-shaped slip ring of the scroll compressor. Detailed Implementation

[0015] (Knowledge, etc., that forms the basis of this invention)

[0016] When the inventors conceived of this invention, as described in Patent Document 1, scroll compressors use cross-slip rings to prevent the rotation of the scroll component. However, sliding losses occur between the cross-slip ring and the bearing components or the scroll component. Furthermore, refrigerant oil is present near the cross-slip ring, and the resistance generated by the viscosity of the refrigerant oil hinders the compressor's efficiency. Therefore, the inventors discovered that to improve compressor efficiency, it is necessary to reduce the sliding losses between the cross-slip ring and the bearing components or the scroll component, while also reducing the viscous resistance of the refrigerant oil. The subject of this invention was thus completed to solve this problem.

[0017] This invention provides a scroll compressor that improves efficiency by reducing the sliding loss between the cross-slip ring and the bearing components or the swirling scroll component, while also reducing the viscous resistance of the refrigeration oil.

[0018] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, there are instances where necessary detailed descriptions have been omitted. For example, detailed descriptions of already known matters or repetitive descriptions of substantially the same structures may be omitted. This is to avoid the following description becoming excessively lengthy and to facilitate understanding by those skilled in the art.

[0019] Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the invention, and are not intended to limit the subject matter described in the claims.

[0020] (Implementation Method 1)

[0021] The following uses Figures 1-5 Implementation method 1 is described below.

[0022] [1-1. Structure]

[0023] like Figure 1 As shown, the scroll compressor 100 is configured by a compression mechanism 10 for compressing refrigerant disposed in a sealed container 1 and an electric mechanism 20 for driving the compression mechanism 10.

[0024] The sealed container 1 consists of a main body 1a that is formed as a cylinder extending in the vertical direction, a lower cover 1b that closes the lower opening of the main body 1a, and an upper cover 1c that closes the upper opening of the main body 1a.

[0025] The sealed container 1 is provided with a refrigerant suction pipe 2 for introducing refrigerant into the compression mechanism section 10 and a refrigerant discharge pipe 3 for discharging the refrigerant compressed in the compression mechanism section 10 to the outside of the sealed container 1.

[0026] The compression mechanism 10 has a fixed scroll member 11, a rotating scroll member 12, and a rotating shaft 13 that drives the rotating scroll member 12 to rotate.

[0027] The electric mechanism 20 has a stator 21 fixed to the sealed container 1 and a rotor 22 disposed inside the stator 21. A rotating shaft 13 is fixed to the rotor 22. An eccentric shaft 13a is formed at the upper end of the rotating shaft 13, which is eccentric to the rotating shaft 13.

[0028] A main bearing 30 supporting the fixed scroll member 11 and the rotating scroll member 12 is provided below them.

[0029] The main bearing 30 comprises a bearing portion 31 that supports the rotating shaft 13 and a boss housing portion 32. The main bearing 30 is fixed to the sealed container 1 by welding or embedding. The lower end 13b of the rotating shaft 13 is supported by a secondary bearing 18 located at the lower part of the sealed container 1.

[0030] The fixed scroll member 11 includes: a circular plate-shaped fixed scroll member end plate 11a; scroll-shaped fixed scroll teeth 11b erected vertically from the fixed scroll member end plate 11a; and an outer peripheral wall portion 11c erected to surround the fixed scroll teeth 11b. An outlet 14 is formed at approximately the center of the fixed scroll member end plate 11a.

[0031] The swirling scroll member 12 includes: a circular plate-shaped swirling scroll member end plate 12a; swirling scroll teeth 12b erected vertically from the rolled side end face of the swirling scroll member end plate 12a; and a cylindrical boss portion 12c formed on the unrolled side end face of the swirling scroll member end plate 12a (the side of the swirling scroll member end plate 12a opposite to the rolled side end face). A cross-shaped slip ring 17 is disposed on the back side of the swirling scroll member end plate 12a to prevent the swirling scroll member 12 from rotating.

[0032] The fixed vortex teeth 11b of the fixed vortex component 11 mesh with the rotating vortex teeth 12b of the rotating vortex component 12, forming a plurality of compression chambers 15 between the fixed vortex teeth 11b and the rotating vortex teeth 12b.

[0033] A boss portion 12c is formed approximately at the center of the end plate 12a of the gyratory scroll member. An eccentric shaft 13a is inserted into the boss portion 12c, and the boss portion 12c is housed in a boss housing portion 32.

[0034] The fixed scroll member 11 is fixed to the main bearing 30 at its outer peripheral wall 11c using multiple bolts (not shown). On the other hand, the rotating scroll member 12 is supported on the fixed scroll member 11 via a cross-slip ring 17 that prevents the rotating scroll member 12 from rotating. The cross-slip ring 17 that prevents the rotating scroll member 12 from rotating is provided between the fixed scroll member 11 and the main bearing 30. Thus, the rotating scroll member 12 rotates without rotating relative to the fixed scroll member 11.

[0035] An oil reservoir 4 for storing lubricating oil is formed at the bottom of the sealed container 1. A positive displacement refrigeration oil pump 5 is provided at the lower end of the rotating shaft 13. The refrigeration oil pump 5 is configured such that its suction port is located within the oil reservoir 4. The refrigeration oil pump 5 is driven by the rotating shaft 13 and reliably draws up the lubricating oil present in the oil reservoir 4 at the bottom of the sealed container 1, regardless of pressure conditions and operating speed. Therefore, concerns about running out of refrigeration oil can be eliminated.

[0036] A rotary shaft refrigeration oil supply hole 13c is formed on the rotary shaft 13, extending from the lower end 13b of the rotary shaft 13 to the eccentric shaft 13a.

[0037] The lubricating oil drawn up by the refrigeration oil pump 5 is supplied to the bearing, bearing portion 31 and boss portion 12c of the auxiliary bearing 18 through the refrigeration oil supply hole 13c formed in the rotating shaft 13.

[0038] Refrigerant drawn in through refrigerant suction pipe 2 is introduced into compression chamber 15 through suction port 15a. Compression chamber 15 moves from the outer periphery towards the center while compressing its volume. Refrigerant that has reached a specified pressure in compression chamber 15 is discharged into discharge chamber 6 through discharge port 14 located at the center of fixed scroll member 11. Discharge reed valve (not shown) is provided at discharge port 14. Refrigerant that has reached a specified pressure in compression chamber 15 pushes open discharge reed valve, thereby discharging refrigerant into discharge chamber 6. The refrigerant discharged into discharge chamber 6 is directed to the upper part of the sealed container 1 and discharged through refrigerant discharge pipe 3.

[0039] Figures 2-5 This indicates a rotation prevention mechanism to prevent the rotation of the swirling scroll member 12. The rotation prevention mechanism consists of a keyway 11e (see reference 11e) provided on the upper surface 11d of the fixed scroll member 11. Figure 2 ); The keyway 12e of the swirling scroll 12 is provided on the back side 12d of the swirling scroll 12 (refer to Figure 3 ); and in Figure 4 and Figure 5 The cross-shaped slip ring 17 is represented in the middle.

[0040] like Figure 4As shown, the cross slip ring 17 includes an annular portion 17a, a first key portion 17b, and a second key portion 17c. In this embodiment, the first key portion 17b is a pair of keys disposed on the axial upper surface of the annular portion 17a and protruding axially into the annular portion 17a. The second key portion 17c is another pair of keys disposed on the axial upper surface of the annular portion 17a and protruding axially into the annular portion 17a. The first key portion 17b engages with the keyway 11e of the fixed scroll member and slides relative to the keyway 11e of the fixed scroll member. The second key portion 17c engages with the keyway 12e of the rotary scroll member and slides relative to the keyway 12e of the rotary scroll member. The axial upper surface of the annular portion 17a slides relative to the back surface 12d of the rotary scroll member, and the axial lower surface of the annular portion 17a slides relative to the bearing portion 31.

[0041] like Figure 4 and Figure 5 As shown, an upper annular portion connecting passage 17d is formed on the axial upper surface of the annular portion 17a of the cross slip ring 17, connecting the inner and outer circumferences of the annular portion 17a. A lower annular portion connecting passage 17e is formed on the axial lower surface of the annular portion 17a of the cross slip ring 17, connecting the inner and outer circumferences of the annular portion 17a. Figure 4 (Represented by dashed lines). The first key portion 17b or the second key portion 17c, or both of the first key portion 17b and the second key portion 17c, of the annular portion 17a of the cross slip ring 17 forms a key portion communication path 17f that connects the inner and outer circumferences of the key portion (see reference). Figure 5 ).

[0042] The upper annular connecting path 17d of the cross slip ring 17 is formed approximately parallel to the direction in which a pair of second key portions 17c are connected by a straight line. The lower annular connecting path 17e is formed approximately parallel to the direction in which a pair of first key portions 17b are connected by a straight line. That is, the upper annular connecting path 17d and the lower annular connecting path 17e are formed approximately parallel to the travel direction of the cross slip ring 17.

[0043] In this embodiment, the upper annular connecting path 17d and the lower annular connecting path 17e provided in the annular portion 17a of the cross slip ring 17 are formed such that the depth Du of the deepest part of the upper annular connecting path 17d and the depth Dd of the deepest part of the lower annular connecting path 17e are in the relationship that Du < Dd. Furthermore, in this embodiment, the depth Dd of the deepest part of the lower annular connecting path 17e is formed such that, relative to the thickness Dt of the thinnest part of the annular portion 17a other than the portion containing the connecting paths (the upper annular connecting portion 17d and the lower annular connecting path 17e in this embodiment), Dt / 10 ≤ Dd ≤ Dt / 2.

[0044] [1-2. Actions]

[0045] Regarding the scroll compressor 100 constructed as described above, its operation and function will be explained below.

[0046] The scroll compressor 100 with the above-described structure has an upper annular connecting passage 17d on the upper surface of the annular portion 17a of the cross slip ring 17. Furthermore, a lower annular connecting passage 17e is provided on the lower surface of the annular portion 17a of the cross slip ring 17. This reduces the contact area between the upper annular connecting passage 17d and the back surface 12d of the scroll member, and between the lower annular connecting passage 17e and the bearing portion 31, thereby reducing sliding losses. Additionally, by having the upper annular connecting passage 17d and the lower annular connecting passage 17e, the flow of refrigeration oil at the contact surfaces of the upper annular connecting passage 17d and the back surface 12d of the scroll member, and between the lower annular connecting passage 17e and the bearing portion 31, is smoothed, reducing the viscous resistance of the refrigeration oil. Because a keyway 17f is formed on the key side of the cross slip ring 17, which is approximately parallel to the direction of travel of the cross slip ring 17 and connects the inner and outer circumferences of the cross slip ring 17, the flow of the refrigeration oil is made smoother and the viscosity resistance of the refrigeration oil is reduced.

[0047] Furthermore, in this embodiment, the upper annular connecting passage 17d and the lower annular connecting passage 17e are formed in approximately the same direction as the rotational movement of the cross slip ring 17. Therefore, the flow of the refrigeration oil can be smoothed, and the effect of reducing the viscous resistance of the refrigeration oil can be improved. For example, the refrigeration oil flowing in the upper annular connecting passage 17d flows in the same direction as the rotational movement of the vortex member 12 when viewed from the perspective of the vortex member 12. Similarly, the refrigeration oil flowing in the lower annular connecting passage 17e flows in the same direction as the rotational movement of the vortex member 12 when viewed from the perspective of the bearing portion 31. Because the refrigeration oil flows in the same direction as the rotational movement, the flow of the refrigeration oil becomes smooth, and the effect of reducing the viscous resistance of the refrigeration oil can be expected.

[0048] Furthermore, the annular connecting path provided in the annular portion 17a can be either the upper annular connecting path 17d or the lower annular connecting path 17e. In this case, although the effect is halved, the effects of reducing sliding resistance and reducing the viscosity resistance of the refrigeration oil can be obtained, thereby achieving high efficiency of the scroll compressor.

[0049] In this embodiment, which includes both an upper annular connecting passage 17d and a lower annular connecting passage 17e, the upper annular connecting passage 17d and the lower annular connecting passage 17e are configured such that the depth Du of the deepest part of the upper annular connecting passage 17d and the depth Dd of the deepest part of the lower annular connecting passage 17e are both less than Du. Therefore, the fluidity of the refrigeration oil can be further improved. That is, during compressor operation, because the refrigeration oil flows vertically downwards due to its own weight, there is a higher probability that the refrigeration oil will be present in the lower part of the cross-slip ring 17. Therefore, Du < Dd, i.e., by forming the lower annular connecting passage 17e deeper, improves the fluidity of the refrigeration oil in the lower part of the cross-slip ring 17, and reduces the viscous resistance of the refrigeration oil. This effectively improves the effect of reducing viscosity loss.

[0050] In particular, when the depth Dd of the deepest part of the lower annular connecting passage 17e of the cross slip ring 17 is made more than twice the depth Du of the deepest part of the upper annular connecting passage 17d, the influence of the refrigeration oil's own weight can be absorbed, thus significantly improving the fluidity of the refrigeration oil and achieving a greater effect of reducing viscosity loss.

[0051] In the scroll compressor 100 of this embodiment, the compressor's sealed container is filled with high-pressure working fluid. In the case of an internal high-pressure type compressor, the cross-slip ring 17 is disposed in the space sandwiched between the bearing portion 31 and the fixed scroll member 11. In the high-pressure type scroll compressor, because the cross-slip ring 17 is present in the space sandwiched between the bearing portion 31 and the fixed scroll member 11, compared with the low-pressure type scroll compressor, refrigerant oil tends to accumulate near the cross-slip ring 17. Therefore, in the case of the high-pressure type scroll compressor, the effect of reducing viscosity loss is greater than that in the case of the low-pressure type scroll compressor.

[0052] In the scroll compressor 100 of this embodiment, the back surface 12d of the rotating scroll member is formed as a pressure (intermediate pressure) region between the discharge pressure and the suction pressure, and the rotating scroll member 12 is pressed against the fixed scroll member 11 by the intermediate pressure. By setting the intermediate pressure region, the periphery of the cross-slip ring 17 also becomes an intermediate pressure region, and the amount of refrigerant oil around the cross-slip ring 17 increases compared to the case where the periphery of the cross-slip ring 17 is a low-pressure space. Therefore, the effect of reducing viscosity loss is greater compared to the low-pressure type. Furthermore, the scroll compressor 100 can also be configured such that at least any one of the aforementioned intermediate pressure, a low pressure lower than the intermediate pressure, and a high pressure higher than the intermediate pressure acts on the back surface 12d of the rotating scroll member. That is, the scroll compressor 100 only needs to have a structure in which at least the intermediate pressure acts on the back surface 12d of the rotating scroll member.

[0053] [1-3. Effects, etc.]

[0054] As described above, in the scroll compressor of this embodiment, at least one of the axial upper and axial lower surfaces of the annular portion of the cross-shaped slip ring is formed with an annular connecting path that connects the inner and outer circumferences of the annular portion. Therefore, the contact area between the bearing components and / or the swirling scroll member and the cross-shaped slip ring is reduced, thereby reducing sliding losses. Furthermore, the flowability of the refrigeration oil present around the cross-shaped slip ring via the connecting path is improved, reducing viscous resistance, thus enabling a high-efficiency scroll compressor.

[0055] In scroll compressors, annular connecting passages can be provided on both the upper and lower surfaces of the cross-shaped slip ring, with the relationship between the deepest part Du of the upper annular connecting passage and the deepest part Dd of the lower annular connecting passage being Du < Dd. This improves the fluidity of the refrigeration oil in the lower part of the cross-shaped slip ring, thereby enhancing the reduction of refrigeration oil viscosity loss.

[0056] In scroll compressors, a keyway can also be formed on the key side of the cross-ring, which is approximately parallel to the direction of travel of the cross-ring and connects the inner and outer circumferences of the cross-ring. This keyway smooths the flow of the refrigeration oil, reducing its viscous resistance.

[0057] In a scroll compressor, both the upper annular connecting passage and the lower annular connecting passage can be formed approximately parallel to the direction of travel of the cross-shaped slip ring. This causes the refrigeration oil to flow in the same direction as the swirling motion, resulting in smoother oil flow and improved reduction of viscous resistance.

[0058] In scroll compressors, the depth Dd of the deepest part of the lower annular connecting passage can be relative to the thickness Dt of the thinnest part of the annular portion of the cross-shaped slip ring (excluding the portion containing the connecting passage), such that Dt / 10 ≤ Dd ≤ Dt / 2. This improves the fluidity of the refrigeration oil, and a greater reduction in viscosity loss can be expected.

[0059] In scroll compressors, the depth Dd of the deepest part of the lower annular connecting passage can be more than twice the depth Du of the deepest part of the upper annular connecting passage. This significantly improves the fluidity of the refrigeration oil, resulting in a greater reduction in viscosity loss.

[0060] The present invention has been described above using the above embodiments. The above embodiments are examples used to illustrate the technology of the present invention. Therefore, various changes, substitutions, additions or omissions can be made within the scope of the claims or their equivalents.

[0061] Furthermore, R32, carbon dioxide, or refrigerants with double bonds between carbon atoms can be used as the refrigerant for the scroll compressor of the present invention.

[0062] Industrial utilization potential

[0063] The scroll compressor of the present invention can achieve high efficiency by reducing sliding losses and reducing the viscous resistance of the refrigeration oil, and is therefore useful in refrigeration cycle devices such as hot water heating devices, air conditioning devices, water heaters or refrigerators.

[0064] Explanation of reference numerals in the attached figures

[0065] 1. Sealed container

[0066] 1a Main Cadre

[0067] 1b Lower cover

[0068] 1c top cover

[0069] 2 Refrigerant Suction Pipe

[0070] 3 Refrigerant discharge pipe

[0071] 4. Oil Storage Section

[0072] 5. Refrigeration oil pump

[0073] 6. Exhaust chamber

[0074] 10. Compression Mechanism Department

[0075] 11 Fixed scroll component

[0076] 11a Fixed scroll end plate

[0077] 11b Fixed vortex gear

[0078] 11c Peripheral wall portion

[0079] 11d Fixed Scroll Upper Surface

[0080] 11e Fixed scroll keyway

[0081] 12 gyratory scroll components

[0082] 12a Rotary scroll end plate

[0083] 12b Cycloidal Vortex

[0084] 12c Boss section

[0085] 12d cyclone vortex component back side

[0086] 12e keyway of vortex component

[0087] 13 Rotation axis

[0088] 13a Eccentric Shaft

[0089] 13b Lower end

[0090] 13c Rotary Shaft Refrigeration Oil Supply Hole

[0091] 14 Discharge outlets

[0092] 15 Compression Chamber

[0093] 15a Inlet

[0094] 17. Cross Slip Ring

[0095] 17a Annular portion

[0096] 17b First bond (bond part)

[0097] 17c Second bond (bond part)

[0098] 17d Upper ring-shaped connecting path

[0099] 17e Lower ring-shaped connecting path

[0100] 17f Key Connecting Path

[0101] 18 sets of bearings

[0102] 20 Electric Mechanism Department

[0103] 21 Stator

[0104] 22 Rotors

[0105] 30 main bearing

[0106] 31 Bearing section

[0107] 32. Surface storage unit

[0108] 100 Scroll compressor.

Claims

1. A scroll compressor characterized by comprising: Comprise: a closed container; a compression mechanism portion capable of compressing a refrigerant, disposed in the closed container, the compression mechanism portion having a fixed scroll, a revolving scroll, and a rotary shaft that revolves the revolving scroll; and an electric mechanism portion that drives the compression mechanism portion, disposed in the closed container, wherein the fixed scroll has a fixed scroll end plate in a circular plate shape, and a fixed scroll tooth disposed on a front surface of the fixed scroll end plate, the revolving scroll has a revolving scroll end plate in a circular plate shape, and a revolving scroll tooth disposed on a front surface of the revolving scroll end plate, the scroll compressor has a cross slide ring disposed on a back surface of the revolving scroll end plate for preventing rotation of the revolving scroll, the cross slide ring has a ring portion, and a pair of first key portions and a pair of second key portions disposed on one of an axial upper surface and an axial lower surface of the ring portion and protruding in an axial direction of the ring portion, at least one of the axial upper surface and the axial lower surface of the ring portion of the cross slide ring is provided with a ring portion communication path that communicates an inner periphery and an outer periphery of the ring portion.

2. The scroll compressor according to claim 1, wherein: a key portion communication path that is substantially parallel to a traveling direction of the cross slide ring and that communicates the inner periphery and the outer periphery of the cross slide ring is provided on a side surface of the first key portion or the second key portion of the cross slide ring.

3. The scroll compressor according to claim 1 or 2, wherein: an upper ring portion communication path that communicates the inner periphery and the outer periphery of the ring portion of the cross slide ring is provided on an axial upper surface of the ring portion of the cross slide ring, a lower ring portion communication path that communicates the inner periphery and the outer periphery of the ring portion of the cross slide ring is provided on an axial lower surface of the ring portion of the cross slide ring, the upper ring portion communication path and the lower ring portion communication path are configured such that a depth Du of a deepest portion of the upper ring portion communication path and a depth Dd of a deepest portion of the lower ring portion communication path satisfy Du < Dd.

4. The scroll compressor according to claim 3, wherein: the first key portion is fitted to the fixed scroll, and the second key portion is fitted to the revolving scroll, the upper ring portion communication path is formed substantially parallel to a direction in which each of the second key portions is connected by a straight line, the lower ring portion communication path is formed substantially parallel to a direction in which each of the first key portions is connected by a straight line.

5. The scroll compressor according to claim 3 or 4, wherein: the depth Dd of the deepest portion of the lower ring portion communication path and a thickness Dt of a thinnest portion of the ring portion of the cross slide ring other than a portion in which the communication path exists are configured to satisfy Dt / 10 ≤ Dd ≤ Dt / 2.

6. The scroll compressor according to claim 3 or 4, wherein: the depth Dd of the deepest portion of the lower ring portion communication path is configured to be more than twice the depth Du of the deepest portion of the upper ring portion communication path.

7. The scroll compressor according to any one of claims 1 to 6, wherein: The sealed container is configured to be filled with a high-pressure working fluid.

8. The scroll compressor as described in any one of claims 1 to 7, characterized in that: The scroll compressor has an intermediate pressure region on the back side of the swirling scroll member, and is configured such that the swirling scroll member is pressed against the fixed scroll member by the pressure of the intermediate pressure region.

Images