A scroll compressor unbalanced load floating ring mechanism and scroll compressor

Abstract

The application discloses a scroll compressor unbalanced load floating ring mechanism and a scroll compressor, which comprise a main shaft, a dynamic scroll, a floating ring, a main bearing seat and a sealing ring. The bottom of the dynamic scroll is provided with an annular groove, the outer circle of the annular groove and the side surface of the dynamic scroll form a sealing surface, and the sealing surface and the annular groove are arranged eccentrically. The floating ring is arranged on the bottom of the dynamic scroll and is always in the rotary period of the sealing surface. The sealing ring is arranged between the main bearing seat and the floating ring, and the floating gap allowing the floating ring to float up and down is left between the main bearing seat and the floating ring. The floating ring of the application is always in the rotary period of the sealing surface of the dynamic scroll, the low pressure and the high pressure acting on the floating ring are both distributed on the center of the floating ring, the floating ring is not subjected to the unbalanced load and the overturning moment, and the stability of the compressor is improved.

Description

Technical Field

[0001] This invention belongs to the field of compressors, and particularly relates to a scroll compressor with a non-offset floating ring mechanism and a scroll compressor. Background Technology

[0002] CO2, as a natural and environmentally friendly refrigerant for vehicle compressors, can greatly improve the energy efficiency of compressors in low-temperature environments. However, compared with the traditional refrigerant R134a, the working pressure of CO2 is 5-10 times that of R134a. Therefore, in current vehicle compressors, the off-center load problem caused by high pressure difference has always been an important factor affecting the performance of scroll compressors.

[0003] For example, application number CN202123119426.3 discloses a floating moving plate mechanism and a compressor including the floating moving plate mechanism. The compressor has a moving plate back pressure hole on the back of the moving plate, generating back pressure on the back of the moving plate, which supports the floating ring and the moving plate. Under this supporting force, the moving plate achieves floating motion through the floating support seat. Under liquid slugging and other overload conditions, it can float through the moving plate to reduce impact. However, because the moving plate has an eccentric structure, the floating ring may deviate and overturn during the process of the back pressure supporting the moving plate, causing it to overturn. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention discloses a scroll compressor with a non-eccentric load floating ring mechanism and a scroll compressor. During the rotation cycle of the moving scroll, the inner circle of the moving scroll sealing surface of the compressor is always within the inner circle of the floating ring. The low-pressure and high-pressure uniformly distributed loads acting on the floating ring are both at the center of the floating ring. The floating ring is not subject to eccentric load and has no overturning moment, thereby improving the stability of the compressor.

[0005] On one hand, the present invention discloses a scroll compressor non-eccentric load floating ring mechanism, including a main shaft 2, which provides rotational driving force for a moving scroll 4; a moving scroll, the bottom of which is provided with an annular groove, the outer circle of which forms a sealing surface with the bottom surface of the moving scroll, the sealing surface being eccentrically positioned with respect to the annular groove; a floating ring, which is placed at the bottom of the moving scroll, and the inner circle of the sealing surface is always within the inner circle of the floating ring during the rotation cycle of the moving scroll; a main bearing housing, a sealing ring being provided between the main bearing housing and the floating ring, and a floating gap being provided between the main bearing housing and the floating ring to allow the floating ring to float up and down.

[0006] By adopting the above scheme, the inner circle of the sealing surface is always within the inner circle of the floating ring during the rotation cycle of the moving scroll. The low-pressure and high-pressure uniformly distributed loads acting on the floating ring are all at the center of the floating ring. The floating ring is not subject to eccentric loads and has no overturning moment, thus improving the stability of the compressor.

[0007] Furthermore, a low-pressure cavity is formed between the outer surface of the floating ring and the sealing ring.

[0008] By adopting the above scheme, the pressure in the low-pressure chamber is evenly distributed on the floating ring, with the equivalent point being the center of the floating ring.

[0009] Furthermore, a high-pressure cavity is formed between the inner surface of the floating ring and the sealing ring.

[0010] By adopting the above scheme, the pressure in the high-pressure chamber is evenly distributed on the floating ring, with the equivalent point being the center of the floating ring. In the high-pressure region, the high pressure causes the floating ring to be close to the sealing surface at the bottom of the moving scroll during its movement, thus achieving a good sealing effect.

[0011] Furthermore, the floating clearance includes a low-pressure side clearance located between the outer side and outer end of the main bearing housing and the outer side and bottom of the floating ring, and a high-pressure side clearance located between the inner end of the main bearing housing and the bottom of the floating ring.

[0012] By adopting the above scheme, the floating ring can float up and down in the small gap of the low-pressure chamber, ensuring the normal start-up of the compressor and compensating for manufacturing tolerances; the gas in the high-pressure chamber can quickly enter the large gap at the bottom of the floating ring, so that the bottom of the floating ring is under uniform pressure.

[0013] Furthermore, the bottom of the moving scroll is provided with several anti-rotation grooves, and the main bearing seat is provided with anti-rotation pins that match the anti-rotation grooves. The anti-rotation pins are inserted into the corresponding anti-rotation grooves.

[0014] By adopting the above scheme, the anti-rotation groove on the moving scroll and the anti-rotation pin on the main bearing housing work together to achieve anti-rotation.

[0015] Furthermore, the bottom of the moving scroll is provided with a back pressure hole, which is connected to the compression cavity formed by the moving scroll and the fixed scroll.

[0016] By adopting the above scheme, the back pressure generated on the back of the moving scroll lifts the floating ring and the moving scroll, and the stability of the floating ring lifting process is improved under the action of the high pressure chamber and the low pressure chamber.

[0017] Furthermore, the end of the main bearing housing is provided with a shaft seal.

[0018] By adopting the above scheme, the moving scroll, floating ring, sealing ring, main bearing housing, and shaft seal form a back pressure cavity, ensuring the sealing performance of the cavity.

[0019] On the other hand, the present invention also discloses a scroll compressor, including any of the above-mentioned scroll compressor non-offset floating ring mechanism. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0021] Figure 1 This is a cross-sectional view of a scroll compressor;

[0022] Figure 2 This is a magnified view of a scroll compressor.

[0023] Figure 3 This is a cross-sectional view of a floating ring mechanism without off-center loading;

[0024] Figure 4 The bottom view shows the unbiased floating ring mechanism.

[0025] Figure 5 It is an isometric view of the moving scroll plate;

[0026] Figure 6 This is a bottom view of the moving scroll plate;

[0027] Figure 7 This is a cross-sectional view of the floating ring under off-center loading.

[0028] Figure 8 This is a diagram showing the pressure below the floating ring under off-center loading conditions.

[0029] Figure 9 This is a diagram showing the pressure above the floating ring under off-center loading.

[0030] The reference numerals in the attached diagram are as follows: main shaft 2, fixed scroll 3, moving scroll 4, annular groove 41, sealing surface 42, anti-rotation groove 43, back pressure hole 44, support force equivalent point 45, thrust equivalent point 46, floating ring 5, main bearing seat 6, low-pressure side clearance 61, high-pressure side clearance 62, anti-rotation pin 63, sealing ring 7, shaft seal 8, low-pressure chamber 9, high-pressure chamber 10. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings.

[0032] In order to achieve the purpose of this invention, such as Figure 1-6 As shown, in some embodiments of a scroll compressor with a non-eccentric load floating ring mechanism and a scroll compressor, a main shaft 2 is included to provide rotational driving force for a moving scroll 4; the moving scroll 4 has an annular groove 41 at its bottom, the outer circle of the annular groove 41 and the bottom surface of the moving scroll 4 forming a sealing surface 42, the sealing surface 42 and the annular groove 41 being eccentrically arranged; a floating ring 5 is placed at the bottom of the moving scroll 4, and the inner circle of the sealing surface 42 is always within the inner circle of the floating ring 5 during the rotation cycle of the moving scroll 4; a main bearing seat 6 is provided with a sealing ring 7 between the main bearing seat 6 and the floating ring 5, and a floating gap is left between the main bearing seat 6 and the floating ring 5 to allow the floating ring 5 to float up and down.

[0033] The beneficial effect of this embodiment is that the sealing surface 42 and the annular groove 41 are eccentrically set. During the rotation of the moving scroll 4, the floating ring 5 is always within the rotation cycle of the sealing surface 42. The pressure acting on the floating ring 5 is evenly distributed at the center position of the floating ring 5, which ensures the stability of the floating ring 5 and improves the stability of the compressor.

[0034] In some embodiments of the present invention, a low-pressure cavity 9 is formed between the outer surface of the floating ring 5 and the sealing ring 7.

[0035] The beneficial effect of this embodiment is that the pressure of the low-pressure chamber 9 is evenly distributed on the floating ring 5, with the equivalent point being the center of the floating ring 5, thereby improving the stability of the floating ring 5.

[0036] In some embodiments of the present invention, a high-pressure cavity 10 is formed between the inner side of the floating ring 5 and the sealing ring 7.

[0037] The beneficial effect of this embodiment is that the pressure of the high-pressure chamber 10 is evenly distributed on the floating ring 5, with the equivalent point being the center of the floating ring 5. In the high-pressure region, the high pressure causes the floating ring 5 to be close to the sealing surface 42 at the bottom of the moving scroll 4 during the movement, thus achieving a good sealing effect.

[0038] The equivalent point of the force exerted by the low-pressure chamber 9 on the floating ring 5 coincides with the equivalent point of the force exerted by the high-pressure chamber 10 on the floating ring 5, and there is no off-center load.

[0039] like Figure 7 As shown, when the floating ring 5 is not within the sealing surface 42 of the moving scroll 4, both the area above and below the floating ring 5 are in high-pressure gas. Figure 8 The high-pressure gas below the floating ring 5 provides an upward supporting force to the floating ring 5. The equivalent point of the supporting force, 45, acts at the center of the floating ring 5. Figure 9 The high-pressure gas above the floating ring 5 exerts a downward thrust on the floating ring 5. The equivalent point of the thrust 46 changes with the rotation of the moving vortex disk 4 and rotates around the equivalent point of the support force 45. At this time, the floating ring 5 has an off-center load moment, which causes it to overturn.

[0040] In some embodiments of the present invention, the floating clearance includes a low-pressure side clearance 61 between the outer side and outer end of the main bearing housing 6 and the outer side and bottom of the floating ring 5, and a high-pressure side clearance 62 between the inner end of the main bearing housing 6 and the bottom of the floating ring 5, wherein the height between the inner end of the main bearing housing 6 and the bottom of the floating ring 5 is greater than the height between the outer end of the main bearing housing 6 and the bottom of the floating ring 5.

[0041] The beneficial effect of this embodiment is that the floating ring 5 can float up and down in the small gap of the low-pressure chamber 9, ensuring the normal start-up of the compressor and compensating for manufacturing tolerances; the gas in the high-pressure chamber 10 can quickly enter the large gap at the bottom of the floating ring 5, so that the bottom of the floating ring 5 is under uniform pressure.

[0042] In some embodiments of the present invention, the bottom of the moving vortex 4 is provided with a plurality of anti-rotation grooves 43, and the main bearing seat 6 is provided with anti-rotation pins 63 that match the anti-rotation grooves 43, and the anti-rotation pins 63 are inserted into the corresponding anti-rotation grooves 43.

[0043] The beneficial effect of this embodiment is that the anti-rotation groove 43 on the moving scroll 4 and the anti-rotation pin 63 on the main bearing seat 6 work together to achieve anti-rotation.

[0044] In some embodiments of the present invention, the bottom of the moving scroll 4 is provided with a back pressure hole 44, which is connected to the compression cavity formed by the moving scroll 4 and the fixed scroll 3.

[0045] The beneficial effect of this embodiment is that the back pressure generated on the back of the moving scroll 4 lifts the floating ring 5 and the moving scroll 4, and the stability of the floating ring lifting process is improved under the action of the high pressure chamber 10 and the low pressure chamber 9.

[0046] In some embodiments of the present invention, the end of the main bearing housing 6 is provided with a shaft seal 8.

[0047] The beneficial effect of this embodiment is that the moving scroll 4, floating ring 5, sealing ring 7, main bearing seat 6, and shaft seal 8 form a back pressure cavity, which ensures the sealing performance of the cavity.

[0048] Furthermore, this invention also discloses a scroll compressor, including the scroll compressor non-offset floating ring mechanism disclosed in any of the above embodiments.

[0049] The working principle of this invention is as follows: The main shaft 2 drives the balance block and the moving scroll 4 to rotate, cooperating with the fixed scroll to complete the working process of air intake, compression, and exhaust. The moving scroll 4 rotates in a plane with a very small radius around the base circle center of the fixed scroll. Gas is drawn into the periphery of the fixed scroll through the air filter. As the main shaft 2 rotates, the gas is gradually compressed in several crescent-shaped compression chambers formed by the moving scroll and the fixed scroll, and then continuously discharged through the axial hole of the central component of the fixed scroll.

[0050] During the rotation of the rotating scroll 4, the inner circle of the sealing surface 42 is always within the inner circle of the floating ring 5. Therefore, the low pressure and high pressure on the floating ring 5 are equivalent to the center of the floating ring 5, and the floating ring 5 will not be subjected to off-center load during the floating process.

[0051] When the floating ring 5 deviates from the sealing surface 42 of the moving scroll 4, both the upper and lower parts of the floating ring 5 are within the high-pressure chamber 10. The upper and lower parts of the floating ring 5 are subjected to high pressure. Furthermore, during the rotation of the moving scroll 4, the equivalent pressure point of the high-pressure chamber 10 above the floating ring 5 and the equivalent pressure point of the high-pressure chamber 10 below the floating ring 5 are not at the same position. This causes the floating ring 5 to experience an off-center load moment during its floating process, resulting in the overturning of the floating ring 5 and affecting the stability of the compressor.

[0052] For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this invention, and these all fall within the protection scope of this invention.

Claims

1. A scroll compressor unbiased floating ring mechanism, characterized by, Comprise: Main shaft (2), provide rotary drive force for the moving scroll (4); Moving scroll (4), the bottom of the moving scroll (4) is provided with an annular groove (41), the outer circle of the annular groove (41) forms a sealing surface (42) with the bottom surface of the moving scroll (4), and the sealing surface (42) is eccentrically arranged with the annular groove (41); Floating ring (5), the floating ring (5) is placed on the bottom of the moving scroll (4), and the inner circle of the sealing surface (42) is always within the inner circle of the floating ring (5) in the rotation cycle of the moving scroll (4); Main bearing seat (6), the sealing ring (7) is arranged between the main bearing seat (6) and the floating ring (5), and the floating gap allowing the floating ring (5) to float up and down is left between the main bearing seat (6) and the floating ring (5); wherein, The outer side surface of the floating ring (5) and the sealing ring (7) form a low pressure cavity (9); the inner side surface of the floating ring (5) and the sealing ring (7) form a high pressure cavity (10); The floating gap includes a low pressure side gap (61) arranged between the outer side and the outer end of the main bearing seat (6) and the outer side and the bottom of the floating ring (5), and a high pressure side gap (62) arranged between the inner end of the main bearing seat (6) and the bottom of the floating ring (5), and the height between the inner end of the main bearing seat (6) and the bottom of the floating ring (5) is greater than the height between the outer end of the main bearing seat (6) and the bottom of the floating ring (5).

2. The scroll compressor unbiased floating ring mechanism of claim 1, wherein, The bottom of the moving scroll (4) is provided with a plurality of anti-rotation grooves (43), and the main bearing seat (6) is provided with a rotation stopping pin (63) matched with the anti-rotation grooves (43), the rotation stopping pin (63) is inserted into the corresponding anti-rotation groove (43).

3. The scroll compressor unbiased floating ring mechanism of claim 1, wherein, The bottom of the moving scroll (4) is provided with a back pressure hole (44), and the back pressure hole (44) is in communication with the compression cavity formed by the moving scroll (4) and the fixed scroll (3).

4. The scroll compressor unbiased floating ring mechanism of claim 1, wherein, The end of the main bearing seat (6) is provided with a shaft seal (8).

5. A scroll compressor characterized by, The scroll compressor unbalanced load floating ring mechanism comprises the floating ring mechanism according to any one of claims 1-4. The scroll compressor unbalanced load floating ring mechanism comprises the floating ring mechanism according to any one of claims 1-4.

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