High-pressure type oil-free scroll compressor

Abstract

The invention discloses a high-pressure type oil-free scroll compressor which comprises a compressor body composed of a first static scroll plate, a first dynamic scroll plate, a second dynamic scroll plate and a second static scroll plate, and the back face of the first dynamic scroll plate and the back face of the second dynamic scroll plate are arranged in an attached mode. The front face of the first orbiting scroll and the front face of the second orbiting scroll are meshed with the back face of the first static scroll and the back face of the second static scroll respectively, and the orbiting scrolls and the static scrolls are matched with each other to form a compression cavity. The scroll compressor further comprises four eccentric pins, an eccentric pin eccentric section is integrally formed in the middle of the outer surface of each eccentric pin, and the eccentric pin eccentric sections of the four eccentric pins are rotationally connected to the four corners of the first movable scroll plate and the four corners of the second movable scroll plate through movable plate bearings respectively. The oil-free scroll air compressor solves the problem that the exhaust pressure of the oil-free scroll air compressor is difficult to reach 1.2 Mpa or above.

Description

Technical Field

[0001] The present invention relates to a compressor, in particular to a high-pressure oil-free scroll compressor. Background Art

[0002] Screw compressors are typically found on the market with exhaust pressures above 1.2 MPa. However, screw compressors are noisy, emit oil from the exhaust, consume a lot of power, and require lengthy maintenance. The rail transit and automotive industries, however, require low-noise, oil-free, low-power, and maintenance-free air compressors as air sources for braking, door opening, and pneumatic suspension systems.

[0003] However, the exhaust pressure of traditional oil-free scroll air compressor is difficult to reach above 1.2Mpa. Figure 1 The traditional oil-free scroll air compressor includes a traditional structure pulley 19, a traditional structure main shaft 20, a traditional structure main shaft eccentric section 2001, a traditional structure eccentric pin 21, a traditional structure movable plate fixing seat 22, a traditional structure movable plate 23, a traditional structure static plate 24, a traditional structure main counterweight 25 and a traditional structure bearing seat 26; wherein the traditional structure pulley 19 drives the traditional structure main shaft 20 to rotate; the traditional structure main shaft 20 is provided with a traditional main shaft eccentric section 2001, which drives the movable plate fixing seat 22 and the movable plate 23 to translate; the traditional eccentric pin 21 plays a role in preventing self-rotation and supporting axial back pressure; the main counterweight 25 plays a role in maintaining movement balance.

[0004] Due to back pressure, this structure primarily relies on the back-side cooling fins of the conventional rotor plate 23 and stator plate 24 for heat dissipation. Its maximum exhaust volume is limited to 750 liters / minute, and its exhaust pressure is limited to 1.2 MPa. Failure to do so can accelerate bearing damage, lead to excessive noise, and result in excessively high internal compressed gas temperatures (exhaust temperatures exceeding 260°C at an ambient temperature of 20°C). The rotor and stator plates and sealing strips are unable to withstand these high temperatures and are prone to damage.

[0005] This structure is difficult to achieve two-stage compression in one machine. Because it is directly driven by the main shaft, if two sets of dynamic and static discs are used for two-stage compression, the main shaft needs to pass through the center of the dynamic disc to drive it. The center is a high-pressure area, which will inevitably cause leakage. This structure has many parts and components, and requires a traditional moving plate fixing seat 22 to transmit the traditional structure main counterweight to the moving plate, 25 to maintain the balance of movement, a traditional structure bearing seat 26 to fix the traditional structure eccentric pin 21 and the traditional structure static plate 24, etc.

[0006] That is, the technical disadvantages of existing oil-free scroll air compressors: ① The exhaust pressure is difficult to reach above 1.2Mpa; it is difficult to be applied to industries that require high exhaust pressure, such as rail transportation, automobile braking, and automobile air suspension industries; ② It is difficult for existing scroll air compressors to achieve large displacement, otherwise the exhaust temperature will be too high and the materials of the dynamic and static disks will not be able to withstand the temperature; ③ The existing scroll air compressor has back pressure during the compression process, which will put axial pressure on the bearings of its anti-rotation mechanism, accelerating the aging of the bearings, increasing the bearing noise, and increasing the power consumption of the compressor; ④ In order to solve the impact of back pressure, the existing scroll compressor has more parts, which indirectly increases the cost and failure rate; ⑤ The existing scroll compressors cannot achieve a one-to-two or one-to-many series structure; when multiple units are working, the volume and cost cannot be effectively reduced. Summary of the Invention

[0007] The object of the present invention is to provide a high-pressure oil-free scroll compressor to solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions: A high-pressure oil-free scroll compressor comprises a compressor body consisting of a fixed scroll plate, a movable scroll plate, a movable scroll plate and a fixed scroll plate, wherein the back side of the movable scroll plate and the back side of the movable scroll plate are fitted together, the front side of the movable scroll plate and the front side of the movable scroll plate are respectively engaged with the back side of the fixed scroll plate and the back side of the fixed scroll plate, and the movable scroll and the fixed scroll plate cooperate with each other to form a compression chamber; the compressor also comprises four eccentric pins, each of which has an eccentric pin eccentric section integrally formed in the middle part of the outer surface of the eccentric pin, and the eccentric pin eccentric sections of the four eccentric pins are respectively connected to the four corners of the movable scroll plate and the movable scroll plate through movable disk bearings; a first-level intake port and a first-level exhaust port are provided on the fixed scroll plate, and a second-level intake port and a second-level exhaust port are provided on the fixed scroll plate, and the first-level exhaust port is connected to the second-level intake port through a pipeline.

[0009] As a further solution of the present invention: the two ends of the eccentric pin respectively pass through the through grooves provided on the static scroll plate 1 and the static scroll plate 2 and are rotatably connected to the driving scroll plate 1 and the driving scroll plate 2 through the eccentric pin sleeve.

[0010] As a further solution of the present invention: the four corners of the driving scroll one and the driving scroll two are each provided with mounting holes, the mounting holes are each fixedly connected to the eccentric section of the eccentric pin sleeve by the driving disc bearing, and both ends of each eccentric pin are fixedly connected to the corresponding axial hole of the eccentric pin sleeve by a flat key; the outer ring of the eccentric section of the eccentric sleeve of the eccentric pin sleeve is not coaxial with the inner ring of its axial hole.

[0011] As a further solution of the present invention: the phase angle difference between the eccentric section of the eccentric sleeve on the eccentric pin sleeve and the eccentric section of the eccentric pin on the eccentric pin is 180 degrees.

[0012] As a further solution of the present invention: it also includes a driving main shaft, the driving main shaft eccentric section of the driving main shaft is rotatably connected to the driving scroll-connecting section formed on the end surface through a bearing, and the other end of the driving main shaft is fixedly connected to a pulley, and the pulley is connected to the active pulley on the output end of the drive unit through a belt transmission.

[0013] As a further solution of the present invention: the through grooves provided on the static scroll plate 1 and the static scroll plate 2 are both rotatably connected to the corresponding eccentric pins through static scroll bearings, and the rotation centers of the static scroll bearings and the eccentric pins are coaxially arranged.

[0014] As a further solution of the present invention: the eccentric pin is driven by a driving unit.

[0015] As a further solution of the present invention: when two or more compressor bodies are connected in series, the driving scroll 1 of the compressor body located at the head is connected to the power unit through the driving main shaft (or the eccentric pin is directly connected to the output end of the driving unit), and the driving scroll 1 of the other compressor body is connected to the driving scroll 2 of the adjacent compressor body through the connecting shaft.

[0016] As a further solution of the present invention: a driving scroll 2 connecting section is opened at the center position of the above-mentioned driving scroll 2; the two ends of the above-mentioned connecting shaft can be connected to the driving scroll 2 connecting section and the driving scroll 1 connecting section of the two compressor bodies through bearings.

[0017] As a further solution of the present invention: when two or more compressor bodies are connected in series, the secondary exhaust port pipe of one compressor body is connected to the primary intake port of the adjacent compressor body.

[0018] Compared with the prior art, the present invention has the following beneficial effects: ① Solve the problem that the exhaust pressure of oil-free scroll air compressor is difficult to reach above 1.2Mpa.

[0019] ② Solve the urgent need for clean, low-noise, energy-saving and maintenance-free air compressors in the rail transit, automobile braking and automobile air suspension industries.

[0020] ③Solve the exhaust temperature and life problems of large-displacement oil-free scroll air compressors.

[0021] ④Solve the maintenance, noise and life problems of bearings.

[0022] ⑤Reduce parts, reduce costs and failure rates.

[0023] ⑥ When multiple units are required to work, they can be connected in series, one to two or one to multiple, effectively saving space. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1Schematic diagram of the prior art.

[0025] Figure 2 This is a schematic diagram of the explosion of the high-pressure oil-free scroll compressor structure.

[0026] Figure 3 This is a schematic diagram of the cross-sectional structure of a high-pressure oil-free scroll compressor at one angle.

[0027] Figure 4 This is a schematic diagram of the cross-sectional structure of the high-pressure oil-free scroll compressor from another angle.

[0028] Figure 5 This is a schematic diagram of the positions of the eccentric section of the eccentric sleeve and the eccentric section of the eccentric pin in a high-pressure oil-free scroll compressor.

[0029] Figure 6 for Figure 5 Enlarged schematic diagram of point A in the middle.

[0030] Figure 7 This is a schematic diagram of the structure of the eccentric sleeve in a high-pressure oil-free scroll compressor.

[0031] Figure 8 This is a schematic diagram of the structure of the eccentric pin in a high-pressure oil-free scroll compressor.

[0032] Figure 9 This is a schematic diagram of the structure of the driving shaft in a high-pressure oil-free scroll compressor.

[0033] Figure 10 This is a schematic diagram of the structure of a combination of two high-pressure oil-free scroll compressors.

[0034] Figure 11 for Figure 10 Schematic diagram of the cross section in the AA direction.

[0035] Figure 12 for Figure 11 Enlarged schematic diagram of point B in the middle Figure 13 This is a schematic diagram of the three-dimensional structure of a combination of two high-pressure oil-free scroll compressors.

[0036] In the figure: pulley 1, driving main shaft 2, driving main shaft eccentric section 201, driving scroll 1 3, driving scroll 1 connecting section 301, static scroll 1 4, movable scroll 1 5, movable scroll 2 6, static scroll 2 7, driving scroll 2 8, eccentric pin sleeve 9, eccentric section 901 of eccentric sleeve, eccentric pin 10, eccentric section 1001 of eccentric pin, movable disc bearing 11, static disc bearing 12, driving disc bearing 13, main driving bearing 14, first-stage air intake 15, first-stage exhaust 16, second-stage air intake 17, second-stage exhaust 18 and cover 19. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0038] See also Figures 2 to 11 In an embodiment of the present invention, a high-pressure oil-free scroll compressor includes a compressor body consisting of a fixed scroll (1) (4), an orbiting scroll (1) (5), an orbiting scroll (2) (6), and a fixed scroll (2) (7). The back surface of the orbiting scroll (1) (5) and the back surface of the orbiting scroll (2) (6) are arranged in close contact with each other, and the front surface of the orbiting scroll (1) (5) and the front surface of the orbiting scroll (2) (6) respectively engage with the back surface of the fixed scroll (1) (4) and the back surface of the fixed scroll (2) (7). The orbiting scroll and the fixed scroll cooperate to form a compression chamber. The back surface of the orbiting scroll (1) (5) and the back surface of the orbiting scroll (2) (6) are arranged in close contact with each other, which can offset the back pressure during compression, greatly reducing the axial load on the bearing, reducing bearing noise, and improving bearing life.

[0039] The invention also includes four eccentric pins 10, and an eccentric pin eccentric section 1001 (such as Figure 8 ), the eccentric segments 1001 of the four eccentric pins 10 are rotatably connected to the four corners of the movable scroll 1 5 and the movable scroll 2 6 through the movable plate bearings 11 respectively.

[0040] The two ends of the eccentric pin 10 pass through the through grooves provided on the static scroll 1 4 and the static scroll 2 7, and the two ends of the eccentric pin 10 pass through the eccentric pin sleeve 9 (such as Figure 7 ) are rotatably connected to the driving scroll 1 3 and the driving scroll 2 8, i.e., the driving scroll 1 3 and the driving scroll 2 8 are located outside the compressor body. The four corners of the driving scroll 1 3 and the driving scroll 2 8 are provided with mounting holes, each of which is fixedly connected to the eccentric section 901 of the eccentric pin sleeve 9 via a driving plate bearing 13. Both ends of each eccentric pin 10 are fixedly connected to the corresponding axial hole of the eccentric pin sleeve 9 via a flat key; Figure 7 The outer ring of the eccentric sleeve eccentric section 901 of the eccentric pin sleeve 9 is not coaxial with the inner ring of its shaft hole, and the shaft hole can be a through hole.

[0041] The above-mentioned static scroll 1 4 and static scroll 2 7 are both provided with through grooves, which are rotatably connected to the corresponding eccentric pin 10 through the static disk bearing 12. The above-mentioned static disk bearing 12 and the rotation center of the eccentric pin 10 are coaxially arranged, which ensures that the eccentric pin 10 can still transmit power after the static scroll 1 4 and static scroll 2 7 are fixed.

[0042] like Figure 10 and 11The first stationary scroll 4 defines a first-stage intake port 15 and a first-stage exhaust port 16, while the second stationary scroll 7 defines a second-stage intake port 17 and a second-stage exhaust port 18. The first-stage exhaust port 16 and the second-stage intake port 17 are connected by a pipe. The pipe design can facilitate cooling, for example, by increasing the pipe length to increase the surface area and heat dissipation area, allowing the gas to enter the next stage after cooling to a certain degree. The first-stage intake port 15 and the second-stage intake port 17 communicate with the air inlet of the compression chamber, while the first-stage exhaust port 16 and the second-stage exhaust port 18 communicate with the air outlet of the compression chamber.

[0043] Preferably, it further comprises a driving spindle 2, wherein the driving spindle 2 has an eccentric section 201 (such as Figure 9 ) is rotatably connected to a driving scroll connecting section 301 formed on the end surface of the driving scroll 3 (the driving scroll connecting section 301 is annular and integrally formed with the driving scroll 3) through a bearing, and the other end of the driving main shaft 2 is fixedly connected to a pulley 1, which is connected to a driving pulley on the output end of a driving unit (which can be a driving motor) through a belt drive, thereby realizing power input.

[0044] The driving main shaft 2 is also connected to the cover 19 through a bearing rotation, and the cover 19, the static scroll 2 7 and the static scroll 1 4 can be fixedly connected by bolts. When the driving unit drives the driving main shaft 2 to rotate, the driving main shaft eccentric section 201 of the driving main shaft 2 drives the driving scroll 1 3 to perform annular translational motion in the plane; eccentric pin sleeves 9 are set at the four corners of the driving scroll 1 3 and the eccentric pin 10 is connected to realize the output of power, so that the eccentric pin eccentric section 1001 in the middle of the eccentric pin 10 drives the movable scroll 1 5 and the movable scroll 2 6 to perform annular translational motion relative to the static scroll 1 4 and the static scroll 2 7 to realize air compression.

[0045] It should be noted that the phase angle difference between the eccentric section 901 of the eccentric sleeve on the eccentric pin sleeve 9 and the eccentric section 1001 of the eccentric pin 10 is 180 degrees (e.g. Figure 5 and 6 ), which ensures that the centers of the movable scroll 1 5 and the movable scroll 2 6 always drive the two sides of the axis of the main shaft 2 with the centers of the driving disk 1 3 and the driving disk 2 8 during the movement, and the phase angle difference is always 180 degrees; in this way, the driving disk 1 3 and the driving disk 2 8 play both the driving role and the counterweight role, without the need for additional main and auxiliary counterweights.

[0046] Orbiting scroll 1 (5) and orbiting scroll 2 (6) are positioned back-to-back and fixedly connected via an orbiting bearing (11) and an eccentric pin (10). Their translational motion engages with fixed scroll 1 (4) and fixed scroll 2 (7), compressing air. Air is drawn in through the primary intake port (15), undergoes primary compression, and is discharged through the primary exhaust port (16). After passing through a cooling pipeline, it is drawn in through the secondary intake port (17) and discharged through the secondary exhaust port (18). This two-stage compression process (orbiting scroll 1 (5) and fixed scroll 1 (4) form the primary compression stage, while orbiting scroll 2 (6) and fixed scroll 2 (7) form the secondary compression stage) allows exhaust pressure to easily exceed 12 bar.

[0047] The movable scroll 1 5 and the movable scroll 2 6 are back-to-back, so the back pressures cancel each other out during the compression process, which greatly reduces the axial load on the bearing, reduces bearing noise, and increases bearing life.

[0048] The eccentric pin 10 can be driven by a driving unit alone, and the driving can also be achieved by directly connecting the output end of the driving unit to the end of one of the eccentric pins 10 through a coupling.

[0049] This high-pressure oil-free compressor uses multiple eccentric pins 10 to drive and connect the movable scrolls (moving scroll 1 5 and movable scroll 2 6), so there is no need to destroy the compression chamber area in the center of the movable scroll, so that the working area of ​​the movable scroll can maintain its integrity and avoid leakage; and the two movable scrolls are back-to-back to offset the back pressure; therefore, when a large flow rate is required, the profile lines of the movable scroll (moving scroll 1 5 and movable scroll 2 6) and the static scroll (static scroll 2 4 and static scroll 2 7) can be made into double vortex lines or triple vortex lines and other structures to increase the flow rate of the first-stage compression and the second-stage compression; when high pressure is required, the movable scroll and the static scroll can be made into a single vortex line structure to improve the compression ratio of the first-stage compression and the second-stage compression.

[0050] This structure can offset the back pressure by adjusting the primary and secondary profiles, reduce the stress on the bearing, increase its service life and reduce noise.

[0051] With this two-stage compression structure, only a very small pressure is required at each stage, and the assembly can achieve a pressure of more than 12 bar (for example, if the compression ratio of the first stage is 3 and the compression ratio of the second stage is 4, then the assembly can easily reach 12 bar).

[0052] Multiple units can be used in series to meet the needs of large flow and high exhaust pressure. Example

[0053] See Figure 10-13 When two or more compressor bodies are connected in series, the driving scroll 1 3 of the compressor body located at the head is connected to the power unit through the driving main shaft 2, and the driving scroll 1 3 of the other compressor body is connected to the driving scroll 2 8 of the adjacent compressor body through the connecting shaft.

[0054] A second driving scroll connecting section 801 (a circular hole) is provided at the center of the second driving scroll 8 .

[0055] The two ends of the connecting shaft can be connected to the driving scroll second connecting section 801 and the driving scroll first connecting section 301 of the two compressor bodies through bearings, thereby achieving multi-stage air compression; When two or more compressor bodies are connected in series, the secondary exhaust port 18 of one compressor body is pipe-connected to the primary intake port 15 of the adjacent compressor body, thereby realizing the input and output of multi-stage compression.

[0056] When the air volume of one pump head (compressor body) is insufficient or the pressure needs to be further increased, two or more pump heads can be connected in series to ensure the air volume or pressure. This series connection method is compact and space-saving.

[0057] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-pressure oil-free scroll compressor, comprising a compressor body consisting of a first static scroll (4), a first movable scroll (5), a second movable scroll (6) and a second static scroll (7), characterized in that: The back of the movable scroll (5) and the back of the movable scroll (6) are fitted together, and the front of the movable scroll (5) and the front of the movable scroll (6) respectively engage with the back of the static scroll (4) and the back of the static scroll (7); the invention also includes four eccentric pins (10), and the middle part of the outer surface of each eccentric pin (10) is integrally formed with an eccentric pin eccentric section (1001), and the eccentric pin eccentric sections (1001) of the four eccentric pins (10) are rotatably connected to the four corners of the movable scroll (5) and the movable scroll (6) through the movable disk bearing (11); the static scroll (4) is provided with a first-level intake port (15) and a first-level exhaust port (16), and the static scroll (7) is provided with a second-level intake port (17) and a second-level exhaust port (18), and the first-level exhaust port (16) is connected to the second-level intake port (17) through a pipeline.

2. The high-pressure oil-free scroll compressor according to claim 1, characterized in that: The two ends of the eccentric pin (10) respectively pass through the through slots provided on the static scroll plate 1 (4) and the static scroll plate 2 (7) and are respectively rotatably connected to the driving scroll plate 1 (3) and the driving scroll plate 2 (8) through the eccentric pin sleeve (9).

3. The high-pressure oil-free scroll compressor according to claim 1 or 2, characterized in that: The four corners of the driving scroll disc 1 (3) and the driving scroll disc 2 (8) are provided with mounting holes, and the eccentric shaft sleeve eccentric section (901) of the eccentric pin shaft sleeve (9) is fixedly connected to the mounting holes through the driving disc bearing (13), and both ends of each eccentric pin (10) are fixedly connected to the corresponding axial hole of the eccentric pin shaft sleeve (9) through a flat key; the outer ring of the eccentric shaft sleeve eccentric section (901) of the eccentric pin shaft sleeve (9) is not coaxial with the inner ring of its axial hole.

4. The high-pressure oil-free scroll compressor according to claim 3, characterized in that: The phase angle difference between the eccentric section (901) of the eccentric sleeve on the eccentric pin sleeve (9) and the eccentric section (1001) of the eccentric pin on the eccentric pin (10) is 180 degrees.

5. The high-pressure oil-free scroll compressor according to claim 4, characterized in that: The eccentric pin (10) is driven by a driving unit.

6. The high-pressure oil-free scroll compressor according to claim 4, characterized in that: The invention also includes a driving main shaft (2), wherein the driving main shaft eccentric section (201) of the driving main shaft (2) is rotatably connected to a driving scroll-connecting section (301) formed on an end surface of a driving scroll (3) through a bearing, and the other end of the driving main shaft (2) is fixedly connected to a pulley (1), and the pulley (1) is connected to a driving pulley on the output end of the driving unit through a belt transmission.

7. The high-pressure oil-free scroll compressor according to claim 6, characterized in that: The through grooves provided on the static scroll plate 1 (4) and the static scroll plate 2 (7) are both rotatably connected to the corresponding eccentric pins (10) via the static disk bearings (12), and the rotation centers of the static disk bearings (12) and the eccentric pins (10) are coaxially arranged.

8. The high-pressure oil-free scroll compressor according to claim 4 or 7, characterized in that: When two or more compressor bodies are connected in series, the driving scroll 1 (3) of the compressor body is connected to the driving scroll 2 (8) of the adjacent compressor body through a connecting shaft.

9. The high-pressure oil-free scroll compressor according to claim 8, characterized in that: A driving scroll second connecting section (801) is provided at the center of the driving scroll second (8); and both ends of the connecting shaft can be connected to the driving scroll second connecting section (801) and the driving scroll first connecting section (301) of the two compressor bodies through bearings.

10. The high-pressure oil-free scroll compressor according to claim 9, characterized in that: When two or more compressor bodies are connected in series, the secondary exhaust port (18) of one compressor body is pipe-connected to the primary intake port (15) of the adjacent compressor body.

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