Scroll compressor

Abstract

The present disclosure provides a scroll compressor. The scroll compressor has a fixed scroll and a rotary scroll. At least one of the fixed base plate and the rotary base plate has a sub discharge port and a groove. The groove is covered by a spiral wall opposite the groove to communicate a compression chamber communicating with the sub discharge port with other compression chambers in the middle of compression and a compression chamber communicating with a main discharge port. The groove always communicates with any compression chamber.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a scroll compressor. BACKGROUND

[0002] The scroll compressor has a fixed scroll and a revolving scroll. The fixed scroll has a fixed base plate and a fixed spiral wall. The fixed spiral wall stands from the fixed base plate. The revolving scroll has a revolving base plate and a revolving spiral wall. The revolving base plate opposes the fixed base plate. The revolving spiral wall stands from the revolving base plate toward the fixed base plate. The revolving spiral wall engages with the fixed spiral wall. Further, a plurality of compression chambers are partitioned by the fixed scroll and the revolving scroll. A main discharge port is formed in the center of the fixed base plate. The main discharge port discharges the compressed fluid.

[0003] In such a scroll compressor, for example, if liquid refrigerant is sucked into the compression chamber, sometimes, liquid compression occurs in the compression chamber. In this case, if liquid compression occurs in the compression chamber, there is a concern that the pressure in the compression chamber becomes abnormally high. If such over-compression occurs in the compression chamber, for example, adverse conditions such as deformation of the fixed spiral wall and the revolving spiral wall occur, and thus the reliability of the scroll compressor deteriorates.

[0004] Therefore, for example, as described in Japanese Patent Application Publication No. H61-223288, a scroll compressor provided with a sub-discharge port is known. According to the scroll compressor of the publication, the sub-discharge port penetrates the spiral wall and the base plate in at least one of the fixed scroll and the revolving scroll. The sub-discharge port discharges the fluid in the compression chamber when the pressure of the compression chamber is equal to or higher than a set pressure. In this way, for example, even if liquid refrigerant is sucked into the compression chamber, the liquid refrigerant is discharged from the sub-discharge port before the pressure in the compression chamber becomes abnormally high. Therefore, the situation in which the pressure in the compression chamber becomes abnormally high is avoided. SUMMARY

[0005] PROBLEMS TO BE SOLVED BY THE INVENTION

[0006] However, as described in the above publication, in the structure in which the sub-discharge port penetrates the spiral wall, in order to form the sub-discharge port in the spiral wall, the width of the spiral wall needs to be designed to be large. Therefore, in correspondence with the width of the spiral wall being designed to be large, the volume of the compression chamber decreases. On the other hand, if the width of the spiral wall is designed to be large without decreasing the volume of the compression chamber, the outer shape of the scroll compressor necessarily becomes large.

[0007] MEANS FOR SOLVING THE PROBLEMS

[0008] One aspect of the scroll compressor disclosed herein includes: a fixed scroll having a fixed base plate and a fixed helical wall erected from the fixed base plate; and a rotary scroll having a rotary base plate opposite to the fixed base plate and a rotary helical wall erected from the rotary base plate toward the fixed base plate and engaging with the fixed helical wall. The fixed scroll and the rotary scroll divide a plurality of compression chambers. The fixed base plate has a main ejection port formed at the center of the fixed base plate and ejecting compressed fluid. At least one of the fixed base plate and the rotary base plate has a secondary ejection port configured to be located at a different position from the main ejection port and to eject fluid from the compression chamber when the pressure in the compression chamber is above a set pressure. The fixed base plate and the rotary base plate have helical wall forming surfaces provided with corresponding helical walls. The helical wall forming surface of the base plate provided with the secondary ejection port has an opening of the secondary ejection port and a groove communicating with the opening. The groove is partially covered by a spiral wall opposite to the groove, such that the compression chamber in the compression intermediate connected to the secondary ejection port is not connected to other compression chambers in the compression intermediate or to the compression chamber connected to the main ejection port, and the groove is always connected to any one of the compression chambers. Attached Figure Description

[0009] Figure 1 This is a side sectional view showing the scroll compressor in the embodiment.

[0010] Figure 2 It is a 3D view of a fixed scroll plate.

[0011] Figure 3 This is a perspective view showing the fixed scroll and the reed valve.

[0012] Figure 4 This is a cross-sectional view showing the fixed scroll and the rotating scroll.

[0013] Figure 5 This is a cross-sectional view showing the fixed scroll and the rotating scroll.

[0014] Figure 6 This is a cross-sectional view showing the fixed scroll and the rotating scroll.

[0015] Figure 7 This is a cross-sectional view showing the fixed scroll and the rotating scroll.

[0016] Figure 8 This is a cross-sectional view showing the fixed scroll and the rotating scroll.

[0017] Figure 9 This is a cross-sectional view showing the fixed scroll and the rotating scroll.

[0018] Figure 10This is a cross-sectional view showing the fixed scroll and the rotating scroll.

[0019] Figure 11 This is a cross-sectional view showing the fixed scroll and the rotating scroll.

[0020] Figure 12 This is a cross-sectional view showing the fixed scroll and the rotating scroll.

[0021] Figure 13 This is a cross-sectional view showing the fixed scroll and the rotating scroll.

[0022] Figure 14 This is a cross-sectional view showing the fixed scroll and the rotating scroll.

[0023] Figure 15 This is a cross-sectional view showing the fixed scroll and the rotating scroll.

[0024] Figure 16 This is a cross-sectional view showing the fixed scroll and the rotating scroll.

[0025] Figure 17 It is a coordinate graph showing the relationship between the rotation angle and the compression ratio. Detailed Implementation

[0026] The following is based on Figures 1-17 One embodiment of a scroll compressor will be described. This scroll compressor is used, for example, in a vehicle air conditioning system.

[0027] <Basic Structure of Scroll Compressor 10>

[0028] like Figure 1 As shown, the scroll compressor 10 has a cylindrical housing 11. The housing 11 includes a motor housing 12, a shaft support housing 13, and an ejector housing 14. The motor housing 12, shaft support housing 13, and ejector housing 14 are made of a metallic material. For example, the motor housing 12, shaft support housing 13, and ejector housing 14 are made of aluminum. The scroll compressor 10 has a rotating shaft 15 housed within the housing 11.

[0029] The motor housing 12 has a plate-shaped end wall 12a and a cylindrical peripheral wall 12b. The peripheral wall 12b extends cylindrically from the outer periphery of the end wall 12a. The axial direction of the peripheral wall 12b is aligned with the axial direction of the rotation shaft 15. The motor housing 12 has a suction port 12h. The suction port 12h is formed in the peripheral wall 12b. The suction port 12h is formed in the portion of the peripheral wall 12b located near the end wall 12a. The suction port 12h connects the inside and outside of the motor housing 12. The suction port 12h draws in refrigerant gas as a fluid.

[0030] The motor housing 12 has a cylindrical boss 12d. The boss 12d protrudes from the inner surface of the end wall 12a. The rotating shaft 15 has a first end as one end in the axial direction and a second end as the other end in the axial direction. The first end of the rotating shaft 15 is inserted into the boss 12d. The scroll compressor 10 includes a rolling bearing 16. The rolling bearing 16 is disposed between the inner circumferential surface of the boss 12d and the outer circumferential surface of the first end of the rotating shaft 15. Moreover, the first end of the rotating shaft 15 is rotatably supported by the motor housing 12 via the rolling bearing 16.

[0031] The shaft support housing 13 has a circular plate-shaped end wall 17 and a cylindrical peripheral wall 18. The peripheral wall 18 extends cylindrically from the outer periphery of the end wall 17. The axial direction of the peripheral wall 18 is aligned with the axial direction of the rotating shaft 15. The shaft support housing 13 has an annular flange wall 19. The flange wall 19 extends radially outward from the end of the outer peripheral surface of the peripheral wall 18 opposite to the end wall 17 toward the rotating shaft 15. The outer periphery of the flange wall 19 contacts the open end of the peripheral wall 12b of the motor housing 12.

[0032] The shaft support housing 13 has a through hole 17a. The through hole 17a is formed in the center of the end wall 17. The through hole 17a extends through the end wall 17 in the thickness direction. A rotating shaft 15 is inserted into the through hole 17a. The end face 15e located on the second end side of the rotating shaft 15 is located inside the peripheral wall 18. The scroll compressor 10 includes a rolling bearing 21. The rolling bearing 21 is disposed between the inner peripheral surface of the peripheral wall 18 and the outer peripheral surface of the rotating shaft 15. Moreover, the rotating shaft 15 is rotatably supported by the shaft support housing 13 via the rolling bearing 21. Therefore, the rotating shaft 15 is rotatably supported by the housing 11.

[0033] The housing 11 has a motor chamber S1. The motor chamber S1 is defined by the motor housing 12 and the shaft support housing 13. The motor chamber S1 is connected to the suction port 12h. Refrigerant gas from the suction port 12h is drawn into the motor chamber S1.

[0034] The scroll compressor 10 includes an electric motor 22. The electric motor 22 is housed within a motor chamber S1. The electric motor 22 has a cylindrical stator 23 and a cylindrical rotor 24. The rotor 24 is disposed inside the stator 23. The rotor 24 rotates integrally with the rotating shaft 15. The stator 23 surrounds the rotor 24. The rotor 24 has a rotor core 24a fixed to the rotating shaft 15 and a plurality of permanent magnets (not shown) disposed on the rotor core 24a. The stator 23 has a cylindrical stator core 23a and a coil 23b. The stator core 23a is fixed to the inner circumferential surface of the peripheral wall 12b of the motor housing 12. The coil 23b is wound around the stator core 23a. Furthermore, by supplying power controlled by an inverter (not shown) to the coil 23b, the rotor 24 is rotated. Thus, the rotating shaft 15 rotates integrally with the rotor 24.

[0035] The ejector housing 14 has a plate-shaped end wall 14a and a cylindrical peripheral wall 14b. The peripheral wall 14b extends cylindrically from the outer periphery of the end wall 14a. The axial direction of the peripheral wall 14b is aligned with the axial direction of the rotation shaft 15. The open end of the peripheral wall 14b contacts the outer periphery of the flange wall 19.

[0036] The ejector housing 14, the shaft support housing 13, and the motor housing 12 are secured by bolt B1. Bolt B1 passes through the peripheral wall 14b of the ejector housing 14 and the outer periphery of the flange wall 19, and is screwed into the peripheral wall 12b of the motor housing 12. Thus, the shaft support housing 13 is connected to the peripheral wall 12b of the motor housing 12, and the ejector housing 14 is connected to the flange wall 19 of the shaft support housing 13. Therefore, the motor housing 12, the shaft support housing 13, and the ejector housing 14 are arranged sequentially along the axial direction of the rotation shaft 15.

[0037] The scroll compressor 10 includes a discharge chamber S2. The discharge chamber S2 is formed within a discharge housing 14. The discharge housing 14 has a discharge outlet 14h. The discharge outlet 14h is formed in the end wall 14a of the discharge housing 14. The discharge outlet 14h communicates with the discharge chamber S2. The discharge outlet 14h discharges refrigerant gas from the discharge chamber S2.

[0038] The nozzle 14h and the suction inlet 12h are connected via an external refrigerant circuit 20. The external refrigerant circuit 20 includes a condenser, expansion valve, and evaporator (not shown). Refrigerant gas ejected from the nozzle 14h flows through the external refrigerant circuit 20. The refrigerant gas flowing through the external refrigerant circuit 20 passes through the condenser, expansion valve, and evaporator, and then returns to the motor compartment S1 via the suction inlet 12h. The scroll compressor 10 and the external refrigerant circuit 20 constitute the vehicle's air conditioning system.

[0039] The scroll compressor 10 has a fixed scroll 25 and a rotary scroll 26. The fixed scroll 25 and the rotary scroll 26 are disposed inside the peripheral wall 14b of the ejector housing 14. The fixed scroll 25 is located axially between the rotary scroll 26 and the end wall 14a on the rotation shaft 15.

[0040] like Figure 1 and Figure 2 As shown, the fixed scroll 25 has a fixed base plate 25a and a fixed spiral wall 25b. The fixed base plate 25a is circular. The fixed spiral wall 25b rises from the fixed base plate 25a on the opposite side towards the end wall 14a. The fixed scroll 25 has a fixed outer peripheral wall 25c. The fixed outer peripheral wall 25c rises cylindrically from the outer periphery of the fixed base plate 25a. The fixed outer peripheral wall 25c surrounds the fixed spiral wall 25b. The dimension from the fixed base plate 25a to the opening end face of the fixed outer peripheral wall 25c is longer than the dimension from the fixed base plate 25a to the front end face of the fixed spiral wall 25b.

[0041] like Figure 1 As shown, the rotating scroll 26 has a rotating base plate 26a and a rotating spiral wall 26b. The rotating base plate 26a is circular. The rotating base plate 26a faces the fixed base plate 25a. The rotating spiral wall 26b rises from the rotating base plate 26a toward the fixed base plate 25a. The rotating spiral wall 26b engages with the fixed spiral wall 25b. The rotating spiral wall 26b is located inside the fixed outer peripheral wall 25c. The front end face of the fixed spiral wall 25b contacts the rotating base plate 26a. Furthermore, a plurality of compression chambers 27 are defined by the fixed base plate 25a, the fixed spiral wall 25b, the rotating base plate 26a, and the rotating spiral wall 26b. Therefore, a plurality of compression chambers 27 are defined by the fixed scroll 25 and the rotating scroll 26. Each compression chamber 27 compresses refrigerant gas.

[0042] The fixed substrate 25a and the rotating substrate 26a have spiral wall forming surfaces with corresponding spiral walls. The spiral wall forming surfaces are also the compression chamber dividing surfaces that delineate the compression chamber.

[0043] The rotating scroll 26 has a cylindrical boss 26c. The boss 26c protrudes from the end face 26e of the rotating base plate 26a on the side opposite to the fixed base plate 25a. The axial direction of the boss 26c is aligned with the axial direction of the rotation shaft 15.

[0044] The rotating scroll 26 has a plurality of recesses 26d. The plurality of recesses 26d are formed around the boss 26c at the end face 26e of the rotating base plate 26a. The plurality of recesses 26d are arranged at predetermined intervals in the circumferential direction of the rotation axis 15. Furthermore, Figure 1 For ease of explanation, only one recess 26d is shown. A ring-shaped component 28 is embedded within each recess 26d. The scroll compressor 10 has multiple pins 29. Each pin 29 is located in the shaft support housing 13. Each pin 29 protrudes from the end face 13e facing the ejector housing 14 in the shaft support housing 13. Each pin 29 is inserted into the ring component 28.

[0045] The scroll compressor 10 includes an eccentric shaft 31. The eccentric shaft 31 protrudes from the end face 15e of the rotating shaft 15, eccentrically positioned relative to the axis L1 of the rotating shaft 15, toward the rotating scroll 26. The eccentric shaft 31 is integrally formed with the rotating shaft 15. The axial direction of the eccentric shaft 31 is aligned with the axial direction of the rotating shaft 15. The eccentric shaft 31 is inserted into the boss portion 26c.

[0046] The scroll compressor 10 includes a counterweight 32 and a bushing 33. The counterweight 32 and the bushing 33 are integrally formed. The bushing 33 is embedded in the outer peripheral surface of the eccentric shaft 31. The counterweight 32 and the bushing 33 are integrally formed. The counterweight 32 is housed within the peripheral wall 18 of the shaft support housing 13. The rotating scroll 26 is supported by the eccentric shaft 31 via the bushing 33 and rolling bearings 34 in a manner that allows it to rotate relative to the eccentric shaft 31.

[0047] The rotation of the rotating shaft 15 is transmitted to the rotary scroll 26 via the eccentric shaft 31, bushing 33, and rolling bearing 34. This causes the rotary scroll 26 to rotate. Furthermore, by contacting the inner circumferential surfaces of each pin 29 with the ring components 28, the rotation of the rotary scroll 26 is prevented, allowing only its revolution. Thus, the rotary scroll 26 revolves while contacting the rotating spiral wall 26b with the fixed spiral wall 25b, reducing the volume of the compression chamber 27 to compress the refrigerant gas. Therefore, the rotary scroll 26 revolves in tandem with the rotation of the rotating shaft 15. The counterweight 32 counteracts the centrifugal force acting on the rotary scroll 26 during its revolution, reducing the imbalance of the rotary scroll 26.

[0048] The scroll compressor 10 includes one or more first slots 35, one or more first holes 36, and one or more second slots 37. Multiple first slots 35 are formed on the inner circumferential surface of the peripheral wall 12b of the motor housing 12. Each first slot 35 opens at its open end in the peripheral wall 12b. Multiple first holes 36 are formed on the outer circumferential portion of the flange wall 19 of the shaft support housing 13. Each first hole 36 penetrates the flange wall 19 in the thickness direction. Each first hole 36 communicates with its corresponding first slot 35. Multiple second slots 37 are formed on the inner circumferential surface of the peripheral wall 14b of the ejection housing 14. Each second slot 37 communicates with its corresponding first hole 36. Furthermore, Figure 1 For ease of illustration, a first groove 35, a first hole 36, and a second groove 37 are shown respectively.

[0049] like Figure 1 and Figure 2 As shown, the fixed scroll 25 has a pair of suction ports 38. Each suction port 38 is formed in the fixed outer peripheral wall 25c of the fixed scroll 25. Each suction port 38 penetrates the fixed outer peripheral wall 25c in the thickness direction. Each suction port 38 communicates with a corresponding second groove 37. The pair of suction ports 38 are, for example, arranged at positions 180 degrees apart in the circumferential direction of the fixed outer peripheral wall 25c.

[0050] like Figure 1As shown, the scroll compressor 10 includes a suction chamber 39. The suction chamber 39 communicates with a pair of suction ports 38. The suction chamber 39 is formed inside a fixed outer peripheral wall 25c. The suction chamber 39 is a space within the space inside the fixed outer peripheral wall 25c that communicates with at least one of the pair of suction ports 38 as the rotating scroll 26 revolves around it. Depending on the position of the rotating scroll 26, the suction chamber 39 may communicate with one of the pair of suction ports 38 but not with the other. Alternatively, depending on the position of the rotating scroll 26, the suction chamber 39 may communicate with both of the pair of suction ports 38.

[0051] The refrigerant gas in the motor chamber S1 is drawn into the suction chamber 39 through each first slot 35, each first hole 36, each second slot 37, and each suction port 38. The refrigerant gas drawn into the suction chamber 39 is compressed in the compression chamber 27 by the revolution of the rotating scroll 26.

[0052] A back pressure chamber S3 is formed within the housing 11. The back pressure chamber S3 is located inside the peripheral wall 18 of the shaft support housing 13. Thus, the back pressure chamber S3 is formed within the housing 11 on the side opposite to the fixed base plate 25a relative to the rotating base plate 26a. The shaft support housing 13 separates the back pressure chamber S3 from the motor chamber S1.

[0053] A back pressure inlet channel 26f is formed in the rotating scroll 26. The back pressure inlet channel 26f passes through the rotating base plate 26a and the rotating spiral wall 26b. A portion of the refrigerant gas in the compression chamber 27 is introduced into the back pressure chamber S3 through the back pressure inlet channel 26f. Since a portion of the refrigerant gas in the compression chamber 27 is introduced into the back pressure chamber S3 through the back pressure inlet channel 26f, the pressure in the back pressure chamber S3 is higher than the pressure in the motor chamber S1. Moreover, due to the increased pressure in the back pressure chamber S3, the front end face of the rotating spiral wall 26b is pressed against the fixed base plate 25a, thereby applying force to the rotating scroll 26 towards the fixed scroll 25.

[0054] <Main ejection port 25h>

[0055] like Figure 1 and Figure 2 As shown, a main ejection port 25h is formed in the center of the fixed substrate 25a. The main ejection port 25h is circular. The main ejection port 25h penetrates the fixed substrate 25a in the thickness direction. The first end of the main ejection port 25h communicates with the compression chamber 27. The second end of the main ejection port 25h communicates with the ejection chamber S2. The main ejection port 25h ejects refrigerant gas compressed by the compression chamber 27 into the ejection chamber S2.

[0056] <Secondary ejection port 40>

[0057] One or more secondary ejection ports 40 are formed on the fixed substrate 25a. Therefore, the fixed substrate 25a is a substrate provided with one or more secondary ejection ports 40. Furthermore, the fixed spiral wall 25b is a spiral wall that rises from the substrate provided with one or more secondary ejection ports 40. Figure 2 As shown, the scroll compressor 10 has a pair of auxiliary ejection ports 40. The pair of auxiliary ejection ports 40 are respectively arranged to sandwich the main ejection port 25h. Therefore, each auxiliary ejection port 40 is located at a different position than the main ejection port 25h. In this embodiment, compared to the case where the auxiliary ejection ports are formed on the spiral wall, it is not necessary to design the spiral wall to be wider. Therefore, the volume of the compression chamber 27 is not reduced, nor is the overall size of the scroll compressor 10 increased.

[0058] Each ejection port 40 is circular. Each ejection port 40 penetrates the fixed substrate 25a in the thickness direction. Figure 1 As shown, the first end of each auxiliary ejection port 40 is connected to the compression chamber 27. The second end of each auxiliary ejection port 40 is connected to the ejection chamber S2. The aperture of each auxiliary ejection port 40 is smaller than the width of the rotating spiral wall 26b. The rotating spiral wall 26b is a spiral wall that overlaps with each auxiliary ejection port 40 when the rotating volute 26 revolves. Therefore, if the rotating volute 26 revolves and the rotating spiral wall 26b overlaps with each auxiliary ejection port 40, then the rotating spiral wall 26b covers each auxiliary ejection port 40. Each auxiliary ejection port 40 ejects refrigerant gas from the compression chamber 27 when the pressure in the compression chamber 27 is above the set pressure.

[0059] <Slot 41>

[0060] like Figure 2 As shown, a groove 41 is formed on the fixed substrate 25a. Therefore, in this embodiment, the sub-ejection ports 40 and the groove 41 are formed on the fixed substrate 25a. A groove 41 is formed on the fixed substrate 25a in a manner communicating with each sub-ejection port 40. The spiral wall forming surface of the fixed substrate 25a has an opening for the sub-ejection port 40 and a groove 41 communicating with that opening. Each groove 41 communicates with the opening of each sub-ejection port 40 that opens toward the compression chamber 27. Each groove 41 has a curved shape extending along the fixed spiral wall 25b. "Each groove 41 extends along the fixed spiral wall 25b" means that each groove 41 extends in a state close to the fixed spiral wall 25b, mimicking the shape of the fixed spiral wall 25b. Each groove 41 extends while curving in an arc from each sub-ejection port 40 along the fixed spiral wall 25b. Each sub-ejection port 40 communicates with a first end in the extending direction of each groove 41. The width of each groove 41 is the same as the orifice diameter of each sub-ejection port 40. Therefore, the width of each groove 41 is narrower than the width of the rotating spiral wall 26b. Thus, the width of each groove 41 is narrower than the width of the rotating spiral wall 26b, which serves as the spiral wall overlapping with the sub-ejection port 40.

[0061] Each slot 41 is located on the track of the rotating spiral wall 26b as the rotating vortex disk 26 revolves. If the rotating vortex disk 26 revolves and the rotating spiral wall 26b overlaps with each slot 41, then the rotating spiral wall 26b covers a portion of each slot 41. Each slot 41 is partially covered by the rotating spiral wall 26b, which is the spiral wall opposite to the slot 41, so that the compression chamber 27 in the compression intermediate connected to the corresponding auxiliary ejection port 40 is not connected to other compression chambers 27 in the compression intermediate or to the compression chamber 27 connected to the main ejection port 25h, and each slot 41 is always connected to any one of the compression chambers 27. That is, each slot 41 satisfies all of the following conditions.

[0062] Condition 1: The groove 41 is partially covered by a rotating spiral wall 26b, which is an opposing spiral wall, so that the compression chamber 27 in the compression intermediate connected to the auxiliary ejection port 40 connected to the groove 41 is not connected to other compression chambers 27 in the compression intermediate.

[0063] Condition 2: The groove 41 is partially covered by a rotating spiral wall 26b, which is an opposing spiral wall, so that the compression chamber 27 connected to the secondary ejection port 40 connected to the groove 41 is not connected to the compression chamber 27 connected to the main ejection port 25h.

[0064] Condition 3: Slot 41 is always connected to any of the compression chambers 27.

[0065] Each auxiliary ejection port 40 is connected to the compression chamber 27 from the moment it begins to compress the refrigerant gas from the compression chamber 27.

[0066] <Reed Valve 51>

[0067] like Figure 3 As shown, the scroll compressor 10 includes a valve mechanism 50. The valve mechanism 50 is provided on the side of the fixed base plate 25a opposite to the fixed spiral wall 25b. The valve mechanism 50 includes a reed valve 51 and a retainer 52. Therefore, the reed valve 51 is provided on the side of the fixed base plate 25a opposite to the spiral wall forming surface.

[0068] The reed valve 51 is in the shape of a thin plate capable of elastic deformation. The reed valve 51 is a metal plate. The reed valve 51 has a mounting part 53, a main valve core 54, and two auxiliary valve cores 55. The mounting part 53, the main valve core 54, and the two auxiliary valve cores 55 are integrally formed from a single metal plate.

[0069] The mounting portion 53 is shaped like a long, narrow rectangular plate. The main valve core 54 and two auxiliary valve cores 55 are also shaped like long, narrow rectangular plates. The main valve core 54 and the two auxiliary valve cores 55 extend from the mounting portion 53 in a consistent length direction. The length direction of the main valve core 54 and the two auxiliary valve cores 55 is orthogonal to the length direction of the mounting portion 53.

[0070] The main valve core 54 extends from the mounting portion 53 toward the main discharge port 25h. Furthermore, the front end of the main valve core 54 covers the main discharge port 25h. Each auxiliary valve core 55 extends from the mounting portion 53 toward its corresponding auxiliary discharge port 40. Furthermore, the front end of each auxiliary valve core 55 covers its respective auxiliary discharge port 40.

[0071] The retainer 52 is a plate thicker than the reed valve 51. The retainer 52 and the reed valve 51 are mounted on the fixed base plate 25a by screwing in bolt B2, which passes through the mounting portion 53 of the retainer 52 and the reed valve 51. The retainer 52 warps away from the fixed base plate 25a as it moves from the mounting portion 53 toward the front ends of the main valve core 54 and each auxiliary valve core 55. Therefore, the main valve core 54 and each auxiliary valve core 55 can swing in a direction relative to or away from the fixed base plate 25a, with the end connected to the mounting portion 53 as a reference point.

[0072] From the state where the main valve core 54 blocks the main ejection port 25h, the reed valve 51 swings away from the fixed base plate 25a, thereby opening the main ejection port 25h. From the state where each auxiliary valve core 55 blocks its corresponding auxiliary ejection port 40, the reed valve 51 swings away from the fixed base plate 25a, thereby opening each auxiliary ejection port 40. The retaining member 52 adjusts the opening degree of the main valve core 54 and the two auxiliary valve cores 55. In this way, the reed valve 51 opens and closes the main ejection port 25h and each auxiliary ejection port 40.

[0073] The refrigerant gas compressed by the compression chamber 27 and ejected from the main ejection port 25h pushes open the main valve core 54, thereby being ejected from the main ejection port 25h into the ejection chamber S2. Additionally, when the pressure in the compression chamber 27 is above the set pressure, the refrigerant gas ejected from each of the auxiliary ejection ports 40 pushes open each of the auxiliary valve cores 55, thereby being ejected from the auxiliary ejection ports 40 into the ejection chamber S2.

[0074] [The Role of the Implementation Method]

[0075] Next, the function of this embodiment will be explained.

[0076] Figures 4-16 The diagram shows the volume change of the compression chamber 27 caused by the revolution of the rotating vortex disk 26. Figure 17 It is shown, for example, in Figures 4-16 The relationship between the rotation angle and the compression ratio in the compression chamber 27, which is shown by the dotted shading. Additionally, in the description of [Effects of the Embodiment], the compression chamber 27 shown by the dotted shading is sometimes simply referred to as "compression chamber 27A". Furthermore, in the description of [Effects of the Embodiment], the compression chamber 27 shown in blank space is sometimes simply referred to as "compression chamber 27B".

[0077] Figure 4 The diagram shows the timing T0 at which the suction chamber 39, which draws in refrigerant gas from each suction port 38, divides a pair of compression chambers 27A by the revolution of the rotating scroll 26. Since each compression chamber 27A at timing T0 is just before the compression of the refrigerant gas begins, therefore... Figure 17 As shown, the compression ratio of each compression chamber 27A is zero.

[0078] Figure 5 The diagram shows the timing T1 at which the compression of the refrigerant gas begins in each compression chamber 27A. For example... Figure 5 As shown, at time T1, each auxiliary ejection port 40 is connected to each compression chamber 27. Therefore, each auxiliary ejection port 40 is connected to the compression chamber 27A from the moment the compression of the refrigerant gas begins in each compression chamber 27A. Additionally, at this time, each slot 41 is not connected to each compression chamber 27B. Therefore, each slot 41 is partially covered by the rotating spiral wall 26b, so that the compression chamber 27A connected to the corresponding auxiliary ejection port 40 is not connected to other compression chambers 27B during compression, nor to the compression chamber 27B connected to the main ejection port 25h.

[0079] like Figures 6-8 As shown, the volume of each compression chamber 27A decreases with the revolution of the rotating scroll 26. Therefore, as... Figure 17 As shown, the compression ratio of each compression chamber 27A gradually increases. Additionally, as... Figures 6-8 As shown, with the revolution of the rotating vortex 26, the area of ​​each slot 41 that is connected to each compression chamber 27A gradually increases.

[0080] like Figure 9 As shown, if the volume of each compression chamber 27A changes with the revolution of the rotating scroll 26 from... Figure 8 As the state shown decreases further, each of the secondary ejection ports 40 begins to overlap with the rotating spiral wall 26b. Then, as... Figure 10 As shown, if the rotating vortex 26 from Figure 9 As the state continues to revolve, the rotating spiral wall 26b covers each of the secondary ejection ports 40. At this time, the end of each groove 41 opposite to the secondary ejection port 40 is maintained in communication with each compression chamber 27A. Therefore, each secondary ejection port 40 is maintained in communication with each compression chamber 27A via each groove 41. Furthermore, in Figures 4-10 In this state, each compression chamber 27A is not connected to the main ejection port 25h, while each compression chamber 27B is connected to the main ejection port 25h.

[0081] like Figure 11 As shown, if the volume of each compression chamber 27A changes with the revolution of the rotating scroll 26 from... Figure 10The state shown is further reduced, and the end of each groove 41 opposite to the auxiliary ejection port 40 is covered by the rotating spiral wall 26b. As a result, the communication between each groove 41 and each compression chamber 27A is cut off. Therefore, the communication between each auxiliary ejection port 40 and each compression chamber 27A is cut off. Moreover, at the time T2 when the communication between each auxiliary ejection port 40 and each compression chamber 27A is cut off, communication begins between one of the pair of compression chambers 27A and the main ejection port 25h. On the other hand, at time T2, each auxiliary ejection port 40 communicates with each compression chamber 27B. Each auxiliary ejection port 40 communicates with the compression chamber 27B from the time when the compression of the refrigerant gas begins within each compression chamber 27B.

[0082] like Figure 12 and Figure 13 As shown, if the rotating vortex 26 from Figure 11 If the state continues to revolve, then the pair of compression chambers 27A will be connected to the main ejection port 25h. Furthermore, if... Figure 13 As shown, a pair of compression chambers 27A are interconnected. Furthermore, as... Figures 13-16 As shown, the volume of the compression chamber 27A gradually decreases as the rotating scroll 26 revolves, and the refrigerant gas in the compression chamber 27A is ejected into the ejection chamber S2 through the main ejection port 25h. Figure 17 As shown, from the moment the main valve core 54 of the reed valve 51 opens at time T3, the compression ratio of the compression chamber 27A remains constant. Furthermore, as... Figure 16 As shown, at time T4, when the volume of compression chamber 27A is at its minimum and the main ejection port 25h is covered by the rotating spiral wall 26b, the main valve core 54 of the reed valve 51 closes, and the compression ratio of compression chamber 27 is zero. Additionally, in Figures 12-16 In this state, each slot 41 is connected to each compression chamber 27B. For example... Figure 17 As shown, in the operating area of ​​the scroll compressor 10, each compression chamber 27 is connected to any one of the auxiliary ejection ports 40 and the main ejection port 25h.

[0083] In this way, since each auxiliary ejection port 40 is always connected to any one of the compression chambers 27 via each slot 41, the operating area where each auxiliary ejection port 40 is not connected to the compression chamber 27 is reduced compared to the case where no slots 41 are formed on the fixed substrate 25a. Therefore, refrigerant gas can be ejected from each auxiliary ejection port 40 over a larger operating area. Consequently, the operating area where refrigerant gas cannot be ejected from each auxiliary ejection port 40 is reduced, and therefore the operating area where the pressure within the compression chamber 27 becomes abnormally high is reduced.

[0084] Each auxiliary ejection port 40 is connected to the compression chamber 27 from the moment the compression of the refrigerant gas begins within the compression chamber 27. Therefore, for example, even if liquid refrigerant is drawn into the compression chamber 27, liquid refrigerant is ejected from each auxiliary ejection port 40 from the moment the compression of the refrigerant gas begins within the compression chamber 27. Thus, liquid compression within the compression chamber 27 is easily avoided.

[0085] [Effects of the Implementation Method]

[0086] The following effects can be obtained from the above embodiments.

[0087] (1) Each slot 41 is partially covered by opposing rotating spiral walls 26b, so that the compression chamber 27 connected to each auxiliary ejection port 40 is not connected to other compression chambers 27 in the compression process, nor to the compression chamber 27 connected to the main ejection port 25h. Moreover, each slot 41 is always connected to any one of the compression chambers 27. Therefore, compared to the case where the fixed base plate 25a with each auxiliary ejection port 40 is not formed with each slot 41, the operating area where each auxiliary ejection port 40 is not connected to the inside of the compression chamber 27 can be reduced. As a result, refrigerant gas can be ejected from each auxiliary ejection port 40 over a larger operating area. Consequently, the operating area where refrigerant gas cannot be ejected from each auxiliary ejection port 40 is reduced, thus reducing the operating area where the pressure inside the compression chamber 27 becomes abnormally high. In summary, the reliability of the scroll compressor 10 can be improved.

[0088] (2) The width of each slot 41 is narrower than the width of the rotating spiral wall 26b that overlaps with each auxiliary ejection port 40. In this way, the rotating spiral wall 26b prevents other intermediate compression chambers 27 and the compression chamber 27 connected to the main ejection port 25h from being connected via the slots 41, relative to the compression chambers 27 connected to the auxiliary ejection ports 40. Therefore, the compression of the refrigerant gas in each compression chamber 27 is stable, thereby further improving the reliability of the scroll compressor 10.

[0089] (3) Each auxiliary ejection port 40 is connected to the compression chamber 27 from the moment the compression of the refrigerant gas begins within the compression chamber 27. In this way, for example, even if liquid refrigerant is drawn into the compression chamber 27, liquid refrigerant can be ejected from each auxiliary ejection port 40 from the moment the compression of the refrigerant gas begins within the compression chamber 27. Therefore, liquid compression within the compression chamber 27 can be easily avoided, thereby preventing the pressure within the compression chamber 27 from becoming abnormally high.

[0090] (4) A reed valve 51 for opening and closing the main ejection port 25h and each of the auxiliary ejection ports 40 is provided on the side of the fixed substrate 25a opposite to the spiral wall forming surface. In this way, the reed valve 51 can prevent the refrigerant gas ejected from the main ejection port 25h and each of the auxiliary ejection ports 40 from flowing back to the main ejection port 25h and each of the auxiliary ejection ports 40. Thus, when each of the auxiliary ejection ports 40 is formed on the fixed substrate 25a, it is necessary to provide the reed valve 51 for opening and closing the main ejection port 25h and each of the auxiliary ejection ports 40 on the side of the fixed substrate 25a opposite to the spiral wall forming surface.

[0091] Here, for example, in order to reduce the operating area where each of the auxiliary ejection ports 40 is not in communication with the compression chamber 27, it is considered not to form a groove 41 on the fixed substrate 25a, but to increase the number of auxiliary ejection ports 40 formed on the fixed substrate 25a. However, corresponding to the increase in the number of auxiliary ejection ports 40 formed on the fixed substrate 25a, the number of reed valves 51 for opening and closing the auxiliary ejection ports 40 increases, or the shape of the reed valves 51 becomes more complex, which is not recommended. Therefore, a groove 41 is formed on the fixed substrate 25a. In this way, the number of auxiliary ejection ports 40 formed on the fixed substrate 25a can be minimized, and the operating area where the auxiliary ejection ports 40 are not in communication with the compression chamber 27 can be reduced. Therefore, there is no increase in the number of reed valves 51, or the shape of the reed valves 51 becomes more complex, thereby making the scroll compressor 10 a simple structure and improving the reliability of the scroll compressor 10.

[0092] (5) The scroll compressor 10 has a pair of auxiliary ejection ports 40. The pair of auxiliary ejection ports 40 are respectively arranged to sandwich the main ejection port 25h. Moreover, a groove 41 is formed on the fixed base plate 25a on which the auxiliary ejection ports 40 are provided, so as to communicate with each auxiliary ejection port 40. In this way, the operating area where refrigerant gas cannot be ejected from the auxiliary ejection ports 40 is further reduced, thereby further reducing the operating area where the pressure in the compression chamber 27 becomes abnormally high. Therefore, the reliability of the scroll compressor 10 can be further improved.

[0093] (6) The groove 41, which is curved and extends from the fixed spiral wall 25b that is erected from the fixed base plate 25a where the secondary ejection port 40 is provided, is preferably a groove 41 that is partially covered by the opposing rotating spiral wall 26b and is always in communication with any of the compression chambers 27.

[0094] [Example of Change]

[0095] Furthermore, the above embodiments can be implemented with the following modifications. The above embodiments and the following modifications can be combined with each other to implement them without technical inconsistencies.

[0096] In this embodiment, the secondary ejection ports 40 may be formed on the rotating substrate 26a instead of the fixed substrate 25a. Furthermore, grooves 41 may be formed on the rotating substrate 26a. In this case, the fixed spiral wall 25b is the spiral wall that overlaps with each secondary ejection port 40 during the revolution of the rotating vortex 26. Therefore, if the rotating vortex 26 revolves and the fixed spiral wall 25b overlaps with each secondary ejection port 40, the fixed spiral wall 25b covers each secondary ejection port 40. The width of each groove 41 is narrower than the width of the fixed spiral wall 25b, which serves as the spiral wall overlapping with the secondary ejection port 40. Each groove 41 is partially covered by the fixed spiral wall 25b, which serves as the opposing spiral wall, so that the compression chamber 27 connected to each secondary ejection port 40 is not connected to other compression chambers 27 in the compression path, nor to the compression chamber 27 connected to the main ejection port 25h, and each groove 41 is always connected to any one of the compression chambers 27. In addition, when the secondary ejection port 40 is formed on the rotating substrate 26a, the refrigerant gas ejected from the secondary ejection port 40 is ejected into the back pressure chamber S3, for example.

[0097] In this embodiment, the secondary ejection port 40 is formed not only on the fixed substrate 25a but also on the rotating substrate 26a. Essentially, the secondary ejection port 40 can be formed on at least one of the fixed substrate 25a and the rotating substrate 26a. Furthermore, the groove 41 can be formed on the substrate where the secondary ejection port 40 is provided. In this specification, "at least one" means "one or more" of two options. That is, it means "only one option" or "both options". For example, "at least one" of the fixed substrate 25a and the rotating substrate 26a means either one of the fixed substrate 25a and the rotating substrate 26a, or both of the fixed substrate 25a and the rotating substrate 26a.

[0098] In this embodiment, each auxiliary ejection port 40 may not be connected to the first end of the extension direction of each groove 41, but rather to a midway point between the two ends of the extension direction of each groove 41. In this case, it is not that each auxiliary ejection port 40 is connected to the compression chamber 27 from the moment the compression of the refrigerant gas begins in the compression chamber 27, but rather that the first end of the extension direction of each groove 41 is connected to the compression chamber 27 from the moment the compression of the refrigerant gas begins in the compression chamber 27. Essentially, either the groove 41 or the auxiliary ejection port 40 needs to be connected from the moment the compression of the refrigerant gas begins in the compression chamber 27.

[0099] In this embodiment, the slot 41 and the auxiliary ejection port 40 may also be disconnected from the compression chamber 27 from the moment the compression of the refrigerant gas begins in the compression chamber 27.

[0100] In this embodiment, each sub-ejection port 40 may not penetrate the fixed substrate 25a in the thickness direction. In this case, each groove 41 can communicate with the opening of each sub-ejection port 40 provided on the spiral wall forming surface. Thus, even when each sub-ejection port 40 does not penetrate the fixed substrate 25a, the aperture of each sub-ejection port 40 can be larger than the width of the rotating spiral wall 26b.

[0101] In the embodiment, the reed valve for opening and closing the main ejection port 25h and the reed valve for opening and closing each auxiliary ejection port 40 can also be provided as different components on the side of the fixed base plate 25a opposite to the fixed spiral wall 25b.

[0102] In this embodiment, the number of secondary ejection ports 40 is not particularly limited; for example, it can be one or more than three. The number of slots 41 can be appropriately varied depending on the number of secondary ejection ports 40.

[0103] In this embodiment, the shape of the groove 41 is not limited to a curved shape extending along the fixed spiral wall 25b.

[0104] In this embodiment, the suction port 38 formed on the fixed outer peripheral wall 25c of the fixed vortex 25 can be one or more. Mainly, the number of suction ports 38 formed on the fixed outer peripheral wall 25c is not particularly limited.

[0105] In one embodiment, the grooves 41 may also be completely covered by the rotating spiral wall 26b. At this time, the compression chambers 27 during compression are not connected to each other via the grooves 41. In this case, even if the grooves 41 are completely covered by the rotating spiral wall 26b, the grooves 41 are only covered by the rotating spiral wall 26b for a period during which the pressure within the compression chamber 27 does not become abnormally high.

[0106] In this embodiment, the scroll compressor 10 may also be a type that is not driven by the electric motor 22, for example, it may be a type that is driven by the vehicle's engine.

[0107] In this embodiment, the scroll compressor 10 is used in a vehicle air conditioning system, but is not limited thereto. For example, the scroll compressor 10 can also be installed in a fuel cell vehicle to compress air, which is a fluid supplied to the fuel cell.

Claims

1. A scroll compressor, comprising: A fixed scroll plate having a fixed base plate and a fixed spiral wall erected from the fixed base plate; and A rotating scroll has a rotating base plate opposite to the fixed base plate, and a rotating spiral wall that rises from the rotating base plate toward the fixed base plate and engages with the fixed spiral wall. The fixed scroll plate and the rotary scroll plate divide the area into multiple compression chambers. The fixed substrate has a main ejection port formed at the center of the fixed substrate, which ejects compressed fluid. At least one of the fixed substrate and the rotating substrate has a secondary ejection port, which is configured to be located at a different position from the main ejection port, and to eject fluid from the compression chamber when the pressure in the compression chamber is above a set pressure. The fixed substrate and the rotating substrate have spiral wall forming surfaces with corresponding spiral walls. The spiral wall forming surface of the substrate having the secondary ejection port has an opening for the secondary ejection port and a groove communicating with the opening. The groove is partially covered by a spiral wall opposite to the groove, such that the compression chamber in the compression intermediate connected to the secondary ejection port is not connected to other compression chambers in the compression intermediate or to the compression chamber connected to the main ejection port, and the groove is always connected to any compression chamber in the direction of the upright of the opposite spiral wall.

2. The scroll compressor according to claim 1, wherein, The width of the groove is narrower than the width of the fixed spiral wall and the spiral wall of the rotating spiral wall that overlaps with the secondary ejection port.

3. The scroll compressor according to claim 1 or claim 2, wherein, Either the trough or the secondary ejection port is in communication with the compression chamber from the moment when fluid compression begins in the compression chamber.

4. The scroll compressor according to claim 1 or claim 2, wherein, The secondary ejection port and the groove are formed on the fixed substrate. A reed valve is provided on the side of the fixed substrate opposite to the spiral wall forming surface to open and close the main ejection port and the auxiliary ejection port.

5. The scroll compressor according to claim 1 or claim 2, wherein, The secondary ejection port is one of a pair of secondary ejection ports. The pair of secondary ejection ports are configured separately, separated from the primary ejection port. The slot is one of a pair of slots that are respectively connected to the pair of auxiliary ejection ports.

6. The scroll compressor according to claim 1 or claim 2, wherein, The groove has a curved shape extending along the spiral wall that rises from the substrate where the secondary ejection port is located.

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