Scroll compressor
The scroll compressor addresses noise and complexity issues by employing a resonance portion with interconnected compression chambers and a Helmholtz resonator to manage pressure pulsation, achieving effective noise reduction and compact design.
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- MITSUBISHI HEAVY IND THERMAL SYST
- Filing Date
- 2024-08-20
- Publication Date
- 2026-05-20
AI Technical Summary
Existing scroll compressors fail to effectively suppress pressure pulsation of refrigerant, leading to noise generation and increased device complexity due to the provision of additional spaces and diaphragms to manage discharge pressure pulsation.
A scroll compressor design incorporating a fixed scroll and an orbiting scroll with a resonance portion that damps vibration at a predetermined frequency, featuring a discharge port and interconnected compression chambers, guided by a Helmholtz resonator mechanism to manage pressure pulsation.
Effectively suppresses pressure pulsation and reduces noise by damping vibrations using a Helmholtz resonator, maintaining a compact design without additional complexity.
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Abstract
Description
Technical Field
[0001] The present disclosure relates to a scroll compressor.Background Art
[0002] In the related art, a scroll compressor that has a fixed scroll and an orbiting scroll which meshes with the fixed scroll is known (for example, see PTL 1). PTL 1 discloses that generation of noise caused by pressure pulsation of a refrigerant compressed by a compression mechanism is suppressed by causing the refrigerant to flow into a muffler space from a discharge hole and vibrating a diaphragm disposed in the muffler space.Citation ListPatent Literature
[0003] [PTL 1] Japanese Unexamined Patent Application Publication No. 2015-105635Summary of InventionTechnical Problem
[0004] However, in PTL 1, since the pressure pulsation of the refrigerant until the refrigerant compressed by the compression mechanism is discharged from the discharge hole cannot be suppressed, noise generated by the pressure pulsation of the refrigerant inside the compression mechanism cannot be suppressed. In addition, a device increases in size by providing a space after the refrigerant compressed by the compression mechanism is discharged from the discharge hole. Further, the device becomes complicated by providing the diaphragm in the space.
[0005] The present disclosure is devised in view of such circumstances, and an object of the present disclosure is to provide a scroll compressor that can effectively suppress pressure pulsation of a fluid generated in a compression portion to reduce noise. Solution to Problem
[0006] According to an aspect of the present disclosure, there is provided a scroll compressor including a compression portion that has a fixed scroll which has a spiral first wall body erected on one side surface of a first end plate and an orbiting scroll which has a spiral second wall body erected on one side surface of a second end plate and meshes with the first wall body to prevent rotation while being supported to be capable of revolving and orbiting and a resonance portion that damps vibration having a predetermined frequency, which is generated by a fluid compressed by the fixed scroll and the orbiting scroll, in which a discharge port through which the fluid compressed by the fixed scroll and the orbiting scroll is discharged is formed in the first end plate of the fixed scroll, a center-side compression chamber that communicates with the discharge port is formed between a first inner end portion of the first wall body and a second inner end portion of the second wall body, a back-side compression chamber that is adjacent to the center-side compression chamber is formed between a back side of the first wall body and a ventral side of the second wall body, a ventral-side compression chamber that is adjacent to the center-side compression chamber is formed between a ventral side of the first wall body and a back side of the second wall body, and in the resonance portion, the fluid is guided from the ventral-side compression chamber in a state where the fluid compressed in the center-side compression chamber flows into the ventral-side compression chamber via the discharge port.Advantageous Effects of Invention
[0007] According to the present disclosure, the scroll compressor that can effectively suppress pressure pulsation of a fluid generated in the compression portion to reduce noise can be provided.Brief Description of Drawings
[0008] FIG. 1 is a vertical sectional view showing a schematic configuration of a scroll compressor according to an embodiment of the present disclosure. FIG. 2 is a sectional view taken along line A-A of the scroll compressor shown in FIG. 1. FIG. 3 is a view of a compression portion of the scroll compressor shown in FIG. 1 as viewed from a fixed scroll side. FIG. 4 is a sectional view taken along line C-C of the scroll compressor shown in FIG. 3. FIG. 5 is a sectional view taken along line A-A showing a first modification example of the scroll compressor. FIG. 6 is a sectional view taken along line A-A showing a second modification example of the scroll compressor. FIG. 7 is a sectional view taken along line A-A showing a third modification example of the scroll compressor. FIG. 8 is a sectional view taken along line C-C showing a fourth modification example of the scroll compressor. FIG. 9 is a sectional view taken along line C-C showing a fifth modification example of the scroll compressor. FIG. 10 is a sectional view taken along line C-C showing a sixth modification example of the scroll compressor. FIG. 11 is a sectional view taken along line C-C showing a seventh modification example of the scroll compressor. Description of Embodiments
[0009] A scroll compressor 100 according to an embodiment of the present disclosure will be described with reference to the drawings. The scroll compressor 100 of the present embodiment is used, for example, in a vehicle air conditioner.
[0010] FIG. 1 is a vertical sectional view showing a schematic configuration of the scroll compressor 100 according to the present embodiment. FIG. 2 is a sectional view taken along line A-A of the scroll compressor 100 shown in FIG. 1. FIG. 3 is a view of a compression portion 20 of the scroll compressor 100 shown in FIG. 1 as viewed from a fixed scroll 21 side. FIG. 1 is a sectional view taken along line B-B of the scroll compressor 100 shown in FIG. 3.
[0011] As shown in FIG. 1, the scroll compressor 100 has a housing 10, the compression portion 20, a motor (drive portion) 30, a rotary shaft 40, a bearing portion 50, a bearing portion 60, a balance weight 70, an inverter 80, and a resonance portion 90.
[0012] The housing 10 forms an outer shell of the scroll compressor 100 and is formed of an aluminum alloy. The housing 10 has a first housing 11, a second housing 12, and a third housing 13. The first housing 11, the second housing 12, and the third housing 13 are configured to be fastened and integrated by a bolt 14. As shown in FIG. 1, the housing 10 is fixed to a casing (not shown) via a leg portion 15 in a state where an axis X1 is disposed in a horizontal direction.
[0013] The housing 10 is formed in a tubular shape along the axis X1 that is a center around which an orbiting scroll 22 orbits. The housing 10 forms an internal space IS for accommodating the compression portion 20 and the motor 30 with the first housing 11, the second housing 12, and the third housing 13.
[0014] As shown in FIG. 1, the housing 10 is provided with an intake port P1 on an upper side in a vertical direction (gravity direction) VD. A refrigerant supplied from the outside is introduced into the internal space IS of the housing 10 from the intake port P1. The refrigerant introduced into the housing 10 passes through the motor 30 along the axis X1 and is guided toward the compression portion 20. The refrigerant sucked from the intake port P1 is a mixed refrigerant (fluid) containing a lubricant and a refrigerant gas.
[0015] The first housing 11 is formed in a substantially cylindrical shape along the axis X1 and has the internal space IS that accommodates the compression portion 20 and the motor 30. The second housing 12 seals one end of the first housing 11 along the axis X1, and a discharge port (not shown) for a refrigerant gas compressed by the compression portion 20 is provided. The third housing 13 seals the other end of the first housing 11 along the axis X1, and a space that accommodates the inverter 80 therein is provided.
[0016] The housing 10 has a partition wall portion 16 that partitions the internal space IS into a first space IS1 where the motor 30 is disposed and a second space IS2 where the bearing portion 50 and the compression portion 20 are disposed. The partition wall portion 16 has a bearing support portion 16a and a thrust plate 16b that are formed integrally with the first housing 11.
[0017] The bearing support portion 16a is a member that partitions the internal space IS into the first space IS1 and the second space IS2 and into which the bearing portion 50 is press-fitted. The thrust plate 16b is a plate-shaped member that is attached to the bearing support portion 16a and supports the orbiting scroll 22 with a sliding surface 16bA that comes into contact with an end surface of the orbiting scroll 22 of the compression portion 20.
[0018] The compression portion 20 is a device that is disposed inside the first housing 11 and rotates around the axis X1 to compress a refrigerant gas. The compression portion 20 has a fixed scroll 21 that is fixed to the second housing 12 and the orbiting scroll 22 that meshes with the fixed scroll 21. The compression portion 20 compresses the refrigerant gas by revolving and orbiting the orbiting scroll 22 with respect to the fixed scroll 21 with a driving force of the motor 30.
[0019] The fixed scroll 21 has a spiral wrap (first wall body) 21B that is a wall body erected on one side surface of an end plate (first end plate) 21A. A discharge port 21C from which a refrigerant gas compressed by the fixed scroll 21 and the orbiting scroll 22 is discharged is formed in the end plate 21A.
[0020] The orbiting scroll 22 has a spiral wrap (second wall body) 22B that is a wall body erected on one side surface of an end plate (second end plate) 22A. The orbiting scroll 22 is connected to an eccentric shaft 41 of the rotary shaft 40 and is supported to be capable of revolving and orbiting via a rotation prevention mechanism (not shown) of the thrust plate 16b. The orbiting scroll 22 meshes with the spiral wrap 21B of the fixed scroll 21 to prevent the rotation while being supported to be capable of revolving and orbiting.
[0021] As shown in FIG. 2, a center-side compression chamber 20A, a back-side compression chamber 20B, and a ventral-side compression chamber 20C are formed between the spiral wrap 21B of the fixed scroll 21 and the spiral wrap 22B of the orbiting scroll 22.
[0022] The center-side compression chamber 20A is formed between a first inner end portion 21Ba of the spiral wrap 21B and a second inner end portion 22Ba of the spiral wrap 22B. The center-side compression chamber 20A communicates with the discharge port 21C. A refrigerant gas compressed in the center-side compression chamber 20A is guided to the outside from the discharge port 21C via a discharge opening P2.
[0023] The back-side compression chamber 20B is a compression chamber formed between a back side of the spiral wrap 21B and a ventral side of the spiral wrap 22B. The back-side compression chamber 20B is disposed adjacent to the center-side compression chamber 20A. The ventral-side compression chamber 20C is a compression chamber formed between a ventral side of the spiral wrap 21B and a back side of the spiral wrap 22B. The ventral-side compression chamber 20C is disposed adjacent to the center-side compression chamber 20A.
[0024] As shown in FIG. 3, the compression portion 20 has a reed valve 23 that is attached to the fixed scroll 21 to close the discharge port 21C. The reed valve 23 is in an open state where a pressure of a refrigerant gas in the center-side compression chamber 20A is equal to or higher than a predetermined pressure and guides the refrigerant gas discharged from the discharge port 21C to a discharge space 21D shown in FIG. 1. The refrigerant gas guided to the discharge space 21D is guided to the outside from the discharge opening P2.
[0025] The motor 30 is a device that causes the orbiting scroll 22 of the compression portion 20 to revolve and orbit around the axis X1 with respect to the fixed scroll 21. The motor 30 has a stator 31 and a rotor 32. The rotor 32 is connected to the rotary shaft 40.
[0026] The rotary shaft 40 is a shaft-shaped member that rotates around the axis X1 by the motor 30. One end of the rotary shaft 40 is supported by the bearing portion 60 fixed to the third housing 13. The other end of the rotary shaft 40 is supported by the bearing portion 50 fixed to the bearing support portion 16a. The eccentric shaft 41 that is disposed eccentrically with respect to the axis X1 is provided at an end portion of the rotary shaft 40 on a compression portion 20 side.
[0027] The eccentric shaft 41 is rotatably attached to a bearing portion fixed to a back surface of the orbiting scroll 22 via the balance weight 70. In this manner, the rotary shaft 40 is attached to the orbiting scroll 22 via the eccentric shaft 41.
[0028] The bearing portion 50 is a member that is press-fitted to the bearing support portion 16a and supports the rotary shaft 40 to be rotatable around the axis X1.
[0029] The bearing portion 60 is a member that is press-fitted into the third housing 13 and supports the rotary shaft 40 to be rotatable around the axis X1.
[0030] The balance weight 70 is a member that is fixed to the eccentric shaft 41 of the rotary shaft 40 and rotates around the axis X1. The balance weight 70 cancels out vibrations caused by revolving and orbiting of the orbiting scroll 22.
[0031] The inverter 80 is a device that generates a drive voltage for driving the motor 30 and controls a rotation speed of the motor 30.
[0032] The resonance portion 90 is a device that damps vibration (pulsation caused by pressure changes) having a predetermined frequency generated by a refrigerant gas compressed by the fixed scroll 21 and the orbiting scroll 22. As shown in FIG. 2, in the resonance portion 90, the refrigerant gas is guided from the ventral-side compression chamber 20C in a state where the refrigerant gas compressed in the center-side compression chamber 20A flows into the ventral-side compression chamber 20C via the discharge port 21C.
[0033] FIG. 2 shows a state where a refrigerant gas compressed in the center-side compression chamber 20A is guided to the discharge port 21C. In a state shown in FIG. 2, the refrigerant gas compressed in the center-side compression chamber 20A is guided to the discharge space 21D via the discharge port 21C. In a state shown in FIG. 2, the discharge port 21C communicates with both the center-side compression chamber 20A and the ventral-side compression chamber 20C. For this reason, a portion of the refrigerant gas compressed in the center-side compression chamber 20A is guided to the ventral-side compression chamber 20C via the discharge port 21C.
[0034] In a state shown in FIG. 2, a pressure of a refrigerant gas in the center-side compression chamber 20A is higher than a pressure of the refrigerant gas in the ventral-side compression chamber 20C. For this reason, pressure pulsation occurs in the refrigerant gas in the ventral-side compression chamber 20C due to the refrigerant gas flowing from the center-side compression chamber 20A into the ventral-side compression chamber 20C. Therefore, in the present embodiment, the resonance portion 90 is provided in order to suppress the pressure pulsation of the refrigerant gas in the ventral-side compression chamber 20C.
[0035] FIG. 4 is a sectional view taken along line C-C of the scroll compressor 100 shown in FIG. 3. As shown in FIG. 4, the resonance portion 90 has a first introduction port 91 that is formed in the end plate 21A and communicates with the ventral-side compression chamber 20C and a first space portion 92 that is formed in the end plate 21A and communicates with the first introduction port 91.
[0036] The first introduction port 91 is a through-hole that is formed to extend along an axis X2 and has a circular section having a first inner diameter D1. The first space portion 92 is a through-hole that is formed to extend along the axis X2 and has a circular section having a second inner diameter D2. The second inner diameter D2 is larger than the first inner diameter D1. The axis X2 is an axis extending parallel to a horizontal direction HD.
[0037] One end of the first space portion 92 communicates with the first introduction port 91, and the other end of the first space portion 92 is open toward the discharge space 21D. An opening portion of the first space portion 92 to the discharge space 21D is closed by a sealing valve 93. Therefore, the first space portion 92 is a space sealed by the sealing valve 93.
[0038] The resonance portion 90 functions as a Helmholtz resonator having a resonance frequency determined by the first inner diameter D1 of the first introduction port 91, a length L1 of the first introduction port 91 along the axis X2, and a volume of the first space portion 92. The resonance portion 90 sets a resonance frequency in advance such that the resonance frequency matches the frequency of vibrations of pressure pulsation that occurs in a refrigerant gas at a position where the resonance portion 90 is disposed, thereby damping the vibrations of the pressure pulsation that occurs in the refrigerant gas.
[0039] The sealing valve 93 has a valve plate 93a that is a plate-shaped elastic member and a suppressing plate 93b that suppresses deformation of the valve plate 93a to be a desired amount. The valve plate 93a is in an open state in a case where the pressure of the first space portion 92 of the resonance portion 90 is higher than the pressure of the discharge space 21D. The first space portion 92 is formed by sealing a through-hole formed in the end plate 21A with the valve plate (valve body) 93a on a thin plate.
[0040] The scroll compressor 100 of the present embodiment described above includes the single resonance portion 90 to which a refrigerant gas is guided from the ventral-side compression chamber 20C in a state where the refrigerant gas compressed in the center-side compression chamber 20A flows into the ventral-side compression chamber 20C via the discharge port 21C. However, other aspects may be adopted. For example, the scroll compressor 100 may include a plurality of resonance portions 90 to which the refrigerant gas is guided from the ventral-side compression chamber 20C in a state where the refrigerant gas compressed in the center-side compression chamber 20A flows into the ventral-side compression chamber 20C via the discharge port 21C.
[0041] FIG. 5 is a sectional view taken along line A-A showing a first modification example of the scroll compressor 100 according to the embodiment of the present disclosure. As shown in FIG. 5, the scroll compressor 100 according to the first modification example includes five resonance portions 90 to which the refrigerant gas is guided from the ventral-side compression chamber 20C in a state where the refrigerant gas compressed in the center-side compression chamber 20A flows into the ventral-side compression chamber 20C via the discharge port 21C. The number of resonance portions 90 included in the scroll compressor 100 according to the first modification example may be any number other than five.
[0042] The plurality of resonance portions 90 shown in FIG. 5 may have the same resonance frequency or may have a combination of a plurality of types of resonance frequencies. By making the resonance frequencies of the plurality of resonance portions 90 the same, vibration at a desired frequency can be reliably suppressed. In addition, by making the resonance frequencies of the plurality of resonance portions 90 different from each other, an increase in each of vibrations of a plurality of types of frequencies can be suppressed.
[0043] The scroll compressor 100 of the present embodiment described above includes the single resonance portion 90 to which a refrigerant gas is guided from the ventral-side compression chamber 20C in a state where the refrigerant gas compressed in the center-side compression chamber 20A flows into the ventral-side compression chamber 20C via the discharge port 21C. However, other aspects may be adopted. For example, the scroll compressor 100 may include a resonance portion 90A to which the refrigerant gas is guided from the back-side compression chamber 20B in a state where the refrigerant gas compressed in the center-side compression chamber 20A flows into the ventral-side compression chamber 20C via the discharge port 21C.
[0044] FIG. 6 is a sectional view taken along line A-A showing a second modification example of the scroll compressor 100 according to the embodiment of the present disclosure. As shown in FIG. 6, the scroll compressor 100 according to the second modification example includes a resonance portion (first resonance portion) 90 to which the refrigerant gas is guided from the ventral-side compression chamber 20C in a state where the refrigerant gas compressed in the center-side compression chamber 20A flows into the ventral-side compression chamber 20C via the discharge port 21C, and the resonance portion (second resonance portion) 90A to which the refrigerant gas is guided from the back-side compression chamber 20B. A sectional view taken along line D-D of the compression portion 20 shown in FIG. 6 is the same as the sectional view shown in FIG. 4.
[0045] In the scroll compressor 100 of the second modification example, in a state where a refrigerant gas compressed in the center-side compression chamber 20A flows into the ventral-side compression chamber 20C via the discharge port 21C, the refrigerant gas is guided from the ventral-side compression chamber 20C to the resonance portion 90, and the refrigerant gas is guided from the back-side compression chamber 20B to the resonance portion 90A. For this reason, vibration at the predetermined frequency generated by the refrigerant gas in the ventral-side compression chamber 20C and the back-side compression chamber 20B is damped by the resonance portion 90 and the resonance portion 90A. Accordingly, noise can be reduced by effectively suppressing pressure pulsation of the refrigerant gas generated in the compression portion 20.
[0046] The resonance portion 90 of the scroll compressor 100 of the present embodiment described above is formed with the first introduction port 91 and the first space portion 92 in the end plate 21A, and the first space portion 92 is sealed by the sealing valve 93 to function as the Helmholtz resonator. However, other aspects may be adopted. For example, the scroll compressor 100 may be formed by sealing the first space portion 92, that is a recess 12a formed in the second housing 12, with a region of the end plate 21A where the first introduction port 91 is formed.
[0047] The scroll compressor 100 of the present embodiment described above includes the single resonance portion 90 to which a refrigerant gas is guided from the ventral-side compression chamber 20C in a state where the refrigerant gas compressed in the center-side compression chamber 20A flows into the ventral-side compression chamber 20C via the discharge port 21C. However, other aspects may be adopted. For example, the scroll compressor 100 may include the plurality of resonance portions 90 to which the refrigerant gas is guided from the ventral-side compression chamber 20C in a state where the refrigerant gas compressed in the center-side compression chamber 20A flows into the ventral-side compression chamber 20C via the discharge port 21C and a plurality of the resonance portions 90A to which the refrigerant gas is guided from the back-side compression chamber 20B.
[0048] FIG. 7 is a sectional view taken along line A-A showing a third modification example of the scroll compressor 100 according to the embodiment of the present disclosure. As shown in FIG. 7, the scroll compressor 100 according to the third modification example includes the plurality of resonance portions (first resonance portions) 90 to which a refrigerant gas is guided from the ventral-side compression chamber 20C in a state where the refrigerant gas compressed in the center-side compression chamber 20A flows into the ventral-side compression chamber 20C via the discharge port 21C and the plurality of resonance portions (second resonance portions) 90A to which the refrigerant gas is guided from the back-side compression chamber 20B.
[0049] In the scroll compressor 100 of the third modification example, in a state where a refrigerant gas compressed in the center-side compression chamber 20A flows into the ventral-side compression chamber 20C via the discharge port 21C, the refrigerant gas is guided from the ventral-side compression chamber 20C to the resonance portion 90, and the refrigerant gas is guided from the back-side compression chamber 20B to the resonance portion 90A. For this reason, vibration at the predetermined frequency generated by the refrigerant gas in the ventral-side compression chamber 20C and the back-side compression chamber 20B is damped by the resonance portion 90 and the resonance portion 90A. Accordingly, noise can be reduced by effectively suppressing pressure pulsation of the refrigerant gas generated in the compression portion 20.
[0050] The plurality of resonance portions 90 shown in FIG. 7 may have the same resonance frequency or may have a combination of a plurality of types of resonance frequencies. In addition, the plurality of resonance portions 90A may have the same resonance frequency or may have a combination of a plurality of types of resonance frequencies. By making the resonance frequencies of the plurality of resonance portions 90 and 90A the same, an increase in vibrations at a desired frequency can be reliably suppressed. In addition, by making the resonance frequencies of the plurality of resonance portions 90 and 90A different from each other, an increase in each of vibrations of a plurality of types of frequencies can be suppressed.
[0051] FIG. 8 is a sectional view taken along line C-C showing a fourth modification example of the scroll compressor 100 according to the embodiment of the present disclosure. As shown in FIG. 8, the recess 12a that extends along the axis X2 parallel to the axis X1 and has a bottom portion is formed in the second housing 12 of the scroll compressor 100 according to the fourth modification example. The first space portion 92 is formed by sealing the recess 12a formed in the second housing 12 with the region of the end plate 21A where the first introduction port 91 is formed.
[0052] In the scroll compressor 100 of the fourth modification example, the first space portion 92 is formed by sealing the recess 12a formed in the second housing 12 with the region of the end plate 21A where the first introduction port 91 is formed, and the first introduction port 91 and the first space portion 92 can be made to function as the Helmholtz resonator.
[0053] The resonance portion 90 of the scroll compressor 100 of the present embodiment described above is formed with the first introduction port 91 and the first space portion 92 in the end plate 21A, and the first space portion 92 is sealed by the sealing valve 93 to function as the Helmholtz resonator. However, other aspects may be adopted. For example, the scroll compressor 100 may have a configuration where the first introduction port 91 and an opening hole 94 are formed in the end plate 21A and the first space portion 92 is formed by attaching a tubular body 95 to the opening hole 94.
[0054] FIG. 9 is a sectional view taken along line C-C showing a fifth modification example of the scroll compressor 100 according to the embodiment of the present disclosure. As shown in FIG. 9, the opening hole 94 that is formed to extend along the axis X2 is formed in the end plate 21A of the scroll compressor 100 according to the fifth modification example. A female screw 94a is formed on an inner peripheral surface of the opening hole 94.
[0055] The tubular body 95 is formed in a tubular shape to extend along the axis X2, and a male screw 95a is formed on an outer peripheral surface of the tubular body 95. By rotating the tubular body 95 around the axis X2 in a state where the male screw 95a of the tubular body 95 is engaged with the female screw 94a of the opening hole 94, the tubular body 95 is attached to the opening hole 94, and the sealed first space portion 92 is formed.
[0056] In the scroll compressor 100 of the fifth modification example, by selecting various shapes for the tubular body 95, the first space portion 92 having any volume can be formed, and the resonance frequency of the resonance portion 90 can be adjusted to any frequency.
[0057] In the resonance portion 90 of the scroll compressor 100 of the present embodiment described above, the first introduction port 91 and the first space portion 92 are formed in the end plate 21A along the axis X2 extending parallel to the horizontal direction HD. However, other aspects may be adopted. For example, the resonance portion 90 may be formed with the first introduction port 91 and the first space portion 92 in the end plate 21A along an axis X3 inclined downward at an inclination angle θ from the horizontal direction HD.
[0058] FIG. 10 is a sectional view taken along line C-C showing a sixth modification example of the scroll compressor 100 according to the embodiment of the present disclosure. As shown in FIG. 10, in the resonance portion 90 of the scroll compressor 100 according to the sixth modification example, the first introduction port 91 and the first space portion 92 are formed in the end plate 21A along the axis (inclined axis) X3 inclined downward from the first space portion 92 toward the first introduction port 91 at the inclination angle θ with respect to the horizontal direction HD.
[0059] In the resonance portion 90 of the scroll compressor 100 according to the sixth modification example, since the first introduction port 91 and the first space portion 92 are inclined downward in the vertical direction VD, a lubricant flowing into the first introduction port 91 and the first space portion 92 together with a refrigerant gas can be returned to the ventral-side compression chamber 20C downward in the vertical direction VD by the weight of the lubricant.
[0060] The scroll compressor 100 of the sixth modification example shown in FIG. 10 may adopt further other aspects. For example, the position of an end portion of the first introduction port 91 on a first space portion 92 side and the position of an end portion of the first space portion 92 on a first introduction port 91 side may be made to match each other in the vertical direction VD. FIG. 11 is a sectional view taken along line C-C showing a seventh modification example of the scroll compressor 100 according to the embodiment of the present disclosure.
[0061] As shown in FIG. 11, in the resonance portion 90 of the scroll compressor 100 of the seventh modification example, the position of the end portion of the first introduction port 91 on the first space portion 92 side and the position of the end portion of the first space portion 92 on the first introduction port 91 side match each other in the vertical direction VD. For this reason, when a lubricant guided to the first space portion 92 reaches the end portion on the first introduction port 91 side due to the weight of the lubricant, all of the lubricant is guided to the end portion of the first introduction port 91 on the first space portion 92 side. Therefore, in the resonance portion 90 of the scroll compressor 100 of the seventh modification example, the entire amount of the lubricant contained in a mixed refrigerant guided to the first introduction port 91 and the first space portion 92 can be returned to the ventral-side compression chamber 20C downward in the vertical direction VD by the weight of the lubricant.
[0062] The operation and effect of the scroll compressor 100 of the present embodiment described above will be described.
[0063] In the scroll compressor 100 of the present embodiment, the orbiting scroll 22 revolves and orbits with respect to the fixed scroll 21, so that a refrigerant gas introduced from an outer peripheral side of the compression portion 20 is gradually compressed and guided to the back-side compression chamber 20B and the ventral-side compression chamber 20C and is further compressed in the center-side compression chamber 20A to be discharged from the discharge port 21C. When a fluid compressed in the center-side compression chamber 20A is discharged from the discharge port 21C, a portion of the refrigerant gas compressed in the center-side compression chamber 20A is guided to the ventral-side compression chamber 20C via the discharge port 21C.
[0064] In a state where a refrigerant gas compressed in the center-side compression chamber 20A flows into the ventral-side compression chamber 20C via the discharge port 21C, the pressure of the refrigerant gas in the center-side compression chamber 20A is higher than the pressure of a fluid in the ventral-side compression chamber 20C. For this reason, pressure pulsation occurs in the refrigerant gas in the ventral-side compression chamber 20C due to the refrigerant gas flowing from the center-side compression chamber 20A into the ventral-side compression chamber 20C.
[0065] In the scroll compressor 100 of the present embodiment, in a state where a refrigerant gas compressed in the center-side compression chamber 20A flows into the ventral-side compression chamber 20C via the discharge port 21C, the refrigerant gas is guided from the ventral-side compression chamber 20C to the resonance portion 90. For this reason, vibration at the predetermined frequency generated by the refrigerant gas in the ventral-side compression chamber 20C is damped by the resonance portion 90. Accordingly, noise can be reduced by effectively suppressing pressure pulsation of the refrigerant gas generated in the compression portion 20.
[0066] In the scroll compressor 100 of the present embodiment, by appropriately setting the length L1 and the sectional area of the first introduction port 91 and the volume of the first space portion 92, the resonance portion 90 can be made to function as the Helmholtz resonator that suppresses vibration at the predetermined frequency, and vibration at the predetermined frequency generated by a refrigerant gas compressed by the fixed scroll 21 and the orbiting scroll 22 can be suppressed.
[0067] In the scroll compressor 100 of the present embodiment, the first introduction port 91 and the first space portion 92 can be made to function as the Helmholtz resonator by sealing the first space portion 92 with the thin plate-shaped valve plate 93a. In addition, in a case where a lubricant is excessively accumulated in the first introduction port 91 and the first space portion 92, the lubricant can be discharged from the first introduction port 91 and the first space portion 92 by bringing the thin plate-shaped valve plate 93a into an open state.
[0068] The scroll compressor described in the present embodiment described above is understood, for example, as follows.
[0069] According to a first aspect of the present disclosure, a scroll compressor (100) includes a compression portion (20) that has a fixed scroll (21) which has a spiral first wall body (21B) erected on one side surface of a first end plate (21A) and an orbiting scroll (22) which has a spiral second wall body (22B) erected on one side surface of a second end plate (22A) and meshes with the first wall body to prevent rotation while being supported to be capable of revolving and orbiting and a resonance portion (90) that damps vibration having a predetermined frequency, which is generated by a fluid compressed by the fixed scroll and the orbiting scroll, in which a discharge port (21C) through which the fluid compressed by the fixed scroll and the orbiting scroll is discharged is formed in the first end plate of the fixed scroll, a center-side compression chamber (20A) that communicates with the discharge port is formed between a first inner end portion of the first wall body and a second inner end portion of the second wall body, a back-side compression chamber (20B) that is adjacent to the center-side compression chamber is formed between a back side of the first wall body and a ventral side of the second wall body, a ventral-side compression chamber (20C) that is adjacent to the center-side compression chamber is formed between a ventral side of the first wall body and a back side of the second wall body, and in the resonance portion, the fluid is guided from the ventral-side compression chamber in a state where the fluid compressed in the center-side compression chamber flows into the ventral-side compression chamber via the discharge port.
[0070] In the scroll compressor according to the first aspect of the present disclosure, the orbiting scroll revolves and orbits with respect to the fixed scroll, so that the fluid introduced from an outer peripheral side of the compression portion is gradually compressed and guided to the back-side compression chamber and the ventral-side compression chamber and is further compressed in the center-side compression chamber to be discharged from the discharge port. When the fluid compressed in the center-side compression chamber is discharged from the discharge port, a portion of the fluid compressed in the center-side compression chamber is guided to the ventral-side compression chamber via the discharge port.
[0071] In a state where the fluid compressed in the center-side compression chamber flows into the ventral-side compression chamber via the discharge port, the pressure of the fluid in the center-side compression chamber is higher than the pressure of the fluid in the ventral-side compression chamber. For this reason, pressure pulsation occurs in the fluid in the ventral-side compression chamber due to the fluid flowing from the center-side compression chamber into the ventral-side compression chamber.
[0072] In the scroll compressor according to the first aspect of the present disclosure, in a state where the fluid compressed in the center-side compression chamber flows into the ventral-side compression chamber via the discharge port, the fluid is guided from the ventral-side compression chamber to the resonance portion. For this reason, vibration at the predetermined frequency generated by the fluid in the ventral-side compression chamber is damped by the resonance portion. Accordingly, noise can be reduced by effectively suppressing pressure pulsation of the fluid generated in the compression portion.
[0073] The scroll compressor according to a second aspect of the present disclosure further includes the following configuration in the first aspect. That is, a plurality of the resonance portions are further included, in a first resonance portion, the fluid is guided from the ventral-side compression chamber in a state where the fluid compressed in the center-side compression chamber flows into the ventral-side compression chamber via the discharge port, and in a second resonance portion, the fluid is guided from the back-side compression chamber in a state where the fluid compressed in the center-side compression chamber flows into the ventral-side compression chamber via the discharge port.
[0074] In the scroll compressor according to the second aspect of the present disclosure, in a state where the fluid compressed in the center-side compression chamber flows into the ventral-side compression chamber via the discharge port, the fluid is guided from the ventral-side compression chamber to the first resonance portion, and the fluid is guided from the back-side compression chamber to the second resonance portion. For this reason, vibration at the predetermined frequency generated by the fluid in the ventral-side compression chamber and the back-side compression chamber is damped by the resonance portion. Accordingly, noise can be reduced by effectively suppressing pressure pulsation of the fluid generated in the compression portion.
[0075] The scroll compressor according to a third aspect of the present disclosure further includes the following configuration in the first or second aspect. That is, the resonance portion has a first introduction port (91) that is formed in the first end plate, communicates with the ventral-side compression chamber, and has a first inner diameter (D1) and a sealed first space portion (92) that is formed in the first end plate, communicates with the first introduction port, and has a second inner diameter larger than the first inner diameter.
[0076] In the scroll compressor according to the third aspect of the present disclosure, by appropriately setting the length and the sectional area of the first introduction port and the volume of the first space portion, the resonance portion can be made to function as the Helmholtz resonator that suppresses vibration at the predetermined frequency, and vibration at the predetermined frequency generated by the fluid compressed by the fixed scroll and the orbiting scroll can be suppressed.
[0077] The scroll compressor according to a fourth aspect of the present disclosure further includes the following configuration in the third aspect. That is, the fluid has a refrigerant compressed by the fixed scroll and the orbiting scroll and a lubricant, and the first space portion is formed by sealing, with a thin plate-shaped valve body (93a), a through-hole having one end communicating with the first introduction port and the other end being opened.
[0078] In the scroll compressor according to the fourth aspect of the present disclosure, the first introduction port and the first space portion can be made to function as the Helmholtz resonator by sealing the first space portion with the thin plate-shaped valve body. In addition, in a case where a lubricant is excessively accumulated in the first introduction port and the first space portion, the lubricant can be discharged from the first introduction port and the first space portion by bringing the thin plate-shaped valve body into an open state.
[0079] The scroll compressor according to a fifth aspect of the present disclosure further includes the following configuration in the third aspect. That is, a housing (10) that has an internal space which is formed in a tubular shape along an axis (X1) around which the orbiting scroll orbits and which accommodates the compression portion is further included, a recess (12a) that extends parallel to the axis and has a bottom portion is formed in the housing, and the first space portion is formed by sealing the recess formed in the housing with a region of the first end plate where the first introduction port is formed.
[0080] In the scroll compressor of the fifth aspect of the present disclosure, the first space portion is formed by sealing the recess formed in the housing with the region of the first end plate where the first introduction port is formed, and the first introduction port and the first space portion can be made to function as the Helmholtz resonator.
[0081] The scroll compressor according to a sixth aspect of the present disclosure further includes the following configuration in the third aspect. That is, the first introduction port and the first space portion are formed along an inclined axis inclined downward toward the first introduction port from the first space portion with respect to a horizontal direction.
[0082] In the scroll compressor according to the sixth aspect of the present disclosure, since the first introduction port and the first space portion are inclined downward in the vertical direction, a lubricant flowing into the first introduction port and the first space portion together with a refrigerant gas can be returned to the compression chamber downward in the vertical direction by the weight of the lubricant.
[0083] The scroll compressor according to a seventh aspect of the present disclosure further includes the following configuration in the sixth aspect. That is, a position of an end portion of the first introduction port on a first space portion side and a position of an end portion of the first space portion on a first introduction port side match each other in a vertical direction.
[0084] In the scroll compressor according to the seventh aspect of the present disclosure, the position of the end portion of the first introduction port on the first space portion side and the position of the end portion of the first space portion on the first introduction port side match each other in the vertical direction. For this reason, when a lubricant guided to the first space portion reaches the end portion on the first introduction port side due to the weight of the lubricant, all of the lubricant is guided to the end portion of the first introduction port on the first space portion side. Therefore, the entire amount of the lubricant contained in a mixed refrigerant guided to the first introduction port and the first space portion can be returned to the compression chamber downward in the vertical direction by the weight of the lubricant.Reference Signs List
[0085] 10: housing 11: first housing 12: second housing 12a: recess 13: third housing 14: bolt 15: leg portion 16: partition wall portion 16a: bearing support portion 20: compression portion 20A: center-side compression chamber 20B: back-side compression chamber 20C: ventral-side compression chamber 21: fixed scroll 21A: end plate (first end plate) 21B: spiral wrap (first wall body) 21C: discharge port 21D: discharge space 22: orbiting scroll 22B: spiral wrap (second wall body) 23: reed valve 30: motor 40: rotary shaft 41: eccentric shaft 90, 90A: resonance portion 91: first introduction port 92: first space portion 93: sealing valve 94: opening hole 95: tubular body 100: scroll compressor D1: first inner diameter D2: second inner diameter HD: horizontal direction IS: internal space IS1: first space IS2: second space P1: intake port P2: discharge opening VD: vertical direction X1, X2, X3: axis θ: inclination angle
Claims
1. A scroll compressor comprising: a compression portion that has a fixed scroll which has a spiral first wall body erected on one side surface of a first end plate and an orbiting scroll which has a spiral second wall body erected on one side surface of a second end plate and meshes with the first wall body to prevent rotation while being supported to be capable of revolving and orbiting; and a resonance portion that damps vibration having a predetermined frequency, which is generated by a fluid compressed by the fixed scroll and the orbiting scroll, wherein a discharge port through which the fluid compressed by the fixed scroll and the orbiting scroll is discharged is formed in the first end plate of the fixed scroll, a center-side compression chamber that communicates with the discharge port is formed between a first inner end portion of the first wall body and a second inner end portion of the second wall body, a back-side compression chamber that is adjacent to the center-side compression chamber is formed between a back side of the first wall body and a ventral side of the second wall body, a ventral-side compression chamber that is adjacent to the center-side compression chamber is formed between a ventral side of the first wall body and a back side of the second wall body, and in the resonance portion, the fluid is guided from the ventral-side compression chamber in a state where the fluid compressed in the center-side compression chamber flows into the ventral-side compression chamber via the discharge port.
2. The scroll compressor according to claim 1, further comprising: a plurality of the resonance portions, wherein in a first resonance portion, the fluid is guided from the ventral-side compression chamber in a state where the fluid compressed in the center-side compression chamber flows into the ventral-side compression chamber via the discharge port, and in a second resonance portion, the fluid is guided from the back-side compression chamber in a state where the fluid compressed in the center-side compression chamber flows into the ventral-side compression chamber via the discharge port.
3. The scroll compressor according to claim 1 or 2, wherein the resonance portion has a first introduction port that is formed in the first end plate, communicates with the ventral-side compression chamber, and has a first inner diameter, and a sealed first space portion that is formed in the first end plate, communicates with the first introduction port, and has a second inner diameter larger than the first inner diameter.
4. The scroll compressor according to claim 3, wherein the fluid has a refrigerant compressed by the fixed scroll and the orbiting scroll and a lubricant, and the first space portion is formed by sealing, with a thin plate-shaped valve body a through-hole having one end communicating with the first introduction port and the other end being opened.
5. The scroll compressor according to claim 3, further comprising: a housing that has an internal space which is formed in a tubular shape along an axis around which the orbiting scroll orbits and which accommodates the compression portion, wherein a recess that extends parallel to the axis and has a bottom portion is formed in the housing, and the first space portion is formed by sealing the recess formed in the housing with a region of the first end plate where the first introduction port is formed.
6. The scroll compressor according to claim 3, wherein the first introduction port and the first space portion are formed along an inclined axis inclined downward toward the first introduction port from the first space portion with respect to a horizontal direction.
7. The scroll compressor according to claim 6, wherein a position of an end portion of the first introduction port on a first space portion side and a position of an end portion of the first space portion on a first introduction port side match each other in a vertical direction.