A balance block structure, a rotor assembly, a pump body and a compressor

Abstract

This invention provides a balance block structure, rotor assembly, pump body, and compressor, relating to the field of compressor technology, and solves the technical problem of oil churning in the crankshaft short shaft balance block. The balance block structure includes a balance block body, which is an eccentric structure mounted on the short shaft of the crankshaft; an oil reservoir chamber formed on the balance block body; the top surface of the oil reservoir chamber is higher than the bottom surface of the lower flange fitted on the short shaft, thus forming an oil passage sealing cavity between the oil reservoir chamber, the lower flange, and the crankshaft; the oil reservoir chamber is clearance-fitted with the outer circumference of the lower flange to allow gas passage. This invention possesses the structural functions of a crankshaft short shaft balance block, effectively reducing the weight of the compressor rotor balance block, lowering the entire balancing system, reducing crankshaft top deflection, and improving shaft stability and reliability. It also achieves complete separation of oil and gas passages within the lower flange cavity, effectively solving the oil churning problem of the crankshaft short shaft balance block, significantly reducing compressor power consumption, and improving compressor performance and reliability.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a balance block structure, rotor assembly, pump body, and compressor. Background Technology

[0002] With the continuous development of rotary compressor technology, the demand for low-cost and miniaturized compressor development is becoming increasingly strong. Compressor outer diameters are becoming smaller, while compressor displacements are increasing. Compressor displacement is directly proportional to the number of cylinders, the cylinder height of each cylinder, the cylinder inner diameter, and the crankshaft eccentricity. When the compressor housing outer diameter is constant, the cylinder inner diameter has a maximum limit. When the cylinder inner diameter reaches this limit, further increasing displacement requires increasing the cylinder height. However, a higher cylinder height significantly increases the bearing span, leading to increased contact stress at the crankshaft bearing edges, resulting in bearing component wear and reduced reliability.

[0003] To address the issue of decreased reliability caused by large bearing span in large-displacement rotary compressors, such as... Figure 1 and Figure 2 As shown, existing technologies often employ a crankshaft balance block 110 on the short shaft 1602 of the crankshaft 160 to optimize the shaft system balance structure and reduce crankshaft buckling deformation, thereby improving shaft system stability and reliability. However, the conventional crankshaft short shaft balance block scheme suffers from oil churning problems, which can lead to increased load and large oil level fluctuations during compressor operation, resulting in a series of problems such as increased power consumption, reduced energy efficiency, increased noise, and poor reliability. Summary of the Invention

[0004] The purpose of this invention is to provide a balance block structure and rotor assembly to solve the technical problem of oil churning by the crankshaft short shaft balance block in the prior art, thereby significantly reducing compressor power consumption and oil level fluctuations, and improving the overall performance and reliability of the compressor.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a balance block structure, comprising:

[0007] The balance weight body is an eccentric structure and is mounted on the short shaft of the crankshaft;

[0008] The oil storage chamber is located on the balance block body;

[0009] The top surface of the oil reservoir is higher than the bottom surface of the lower flange sleeved on the short shaft, so as to form an oil passage sealing cavity between the oil reservoir, the lower flange and the crankshaft;

[0010] The oil storage chamber is fitted with a clearance between the lower flange and the outer circumference to allow gas to pass through.

[0011] Furthermore, the gap δ between the oil storage cavity and the outer periphery of the lower flange is 0.04-0.06 mm.

[0012] Furthermore, the balance block body includes a base, an eccentric portion, a connecting portion, and an oil delivery hole; wherein:

[0013] The eccentric portion is disposed on one side of the substrate;

[0014] The oil storage cavity is formed at the top of the substrate;

[0015] The connecting part is disposed at the bottom of the base;

[0016] The oil delivery hole is disposed through the connecting part and communicates with the oil storage cavity.

[0017] The balance block structure provided by this invention is installed on the short shaft of the crankshaft and is an eccentric structure. It has the structural function of a crankshaft short shaft balance block, which can effectively reduce the weight of the compressor rotor balance block, move the entire balancing system downward, reduce the deflection of the top of the crankshaft, and improve the stability and reliability of the shaft system. By setting an oil reservoir on the balance block body, with the oil reservoir located at the end of the short shaft and the top surface of the oil reservoir cavity being higher than the bottom surface of the lower flange sleeved on the short shaft, an oil passage sealing cavity is formed between the oil reservoir cavity, the lower flange, and the crankshaft. This can achieve complete separation of the oil and gas passages in the lower flange cavity, effectively solve the problem of oil churning by the crankshaft short shaft balance block, significantly reduce compressor power consumption, and improve compressor performance and reliability.

[0018] Secondly, the present invention provides a rotor assembly including a crankshaft and a lower flange; the crankshaft includes a short shaft, and the lower flange is sleeved on the short shaft; the balance block structure is mounted on the short shaft; the journal of the lower flange extends into the oil reservoir.

[0019] Furthermore, an oil return hole is provided on the short shaft corresponding to the position of the oil storage cavity, so that the oil in the oil storage cavity can flow back to the crankshaft center oil hole.

[0020] Furthermore, the oil return hole is a straight hole or an oblique hole.

[0021] Furthermore, the number of oil return holes is at least one, and all the oil return holes are evenly arranged along the circumferential direction of the minor axis.

[0022] Furthermore, a gap is left between the lower end of the journal and the lower end of the crankshaft, and the oil return hole is opened at the gap position.

[0023] Furthermore, the crankshaft includes at least one eccentric shaft, and the eccentric portion of the balance block body is arranged at a 180° angle to the adjacent eccentric shaft in the horizontal direction.

[0024] Furthermore, the relationship between the total channel cross-sectional area S of the oil return hole and the cross-sectional area S0 of the central oil hole of the crankshaft is: 0.2≤S / S0≤0.4.

[0025] Furthermore, the upper end face of the balance block body and the lower end face of the journal of the lower flange have an axial height difference h.

[0026] Furthermore, the height difference h ≥ 1.

[0027] Furthermore, the inner wall of the lower flange is provided with a spiral oil groove or several vertical oil grooves for the pumped oil to flow upward; when the oil groove is a spiral oil groove, the spiral direction is the same as the rotation direction of the crankshaft.

[0028] The rotor assembly provided by this invention, by setting a balance block structure that enables oil-gas separation in the lower flange cavity, can effectively solve the problem of oil churning by the balance block of the crankshaft short shaft, significantly reduce compressor power consumption and oil level fluctuations, and improve the overall performance and reliability of the compressor.

[0029] Thirdly, the present invention provides a pump body including the rotor assembly.

[0030] Fourthly, the present invention provides a compressor including the pump body.

[0031] Furthermore, the compressor is a large-displacement rotary compressor. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a compressor in the prior art;

[0034] Figure 2 This is a schematic diagram of the crankshaft balance block and oil-gas passage structure in the existing technology;

[0035] Figure 3 This is a schematic diagram of the balance block structure and oil-gas circuit structure in the pump body of the present invention;

[0036] Figure 4 yes Figure 3 Enlarged view of part M in the middle;

[0037] Figure 5 This is a top view of the balance block structure of the present invention;

[0038] Figure 6 This is a front cross-sectional view of the balance block structure of the present invention;

[0039] Figure 7 This is a front view of the radial oil return hole of one embodiment of the short shaft in the rotor assembly of the present invention;

[0040] Figure 8 This is a top cross-sectional view of the radial oil return hole in one embodiment of the short shaft of the rotor assembly of the present invention;

[0041] Figure 9 This is a front view of the radial oil return hole in another embodiment of the short shaft in the rotor assembly of the present invention;

[0042] Figure 10 This is a top cross-sectional view of the radial oil return hole in another embodiment of the short shaft in the rotor assembly of the present invention;

[0043] Figure 11 This is a schematic diagram of the structure of the lower flange in one embodiment of the pump body of the present invention;

[0044] Figure 12 This is a schematic diagram of another embodiment of the lower flange in the pump body of the present invention.

[0045] In the diagram: 1. Balance block body; 11. Eccentric part; 12. Oil supply hole; 13. Connecting part; 14. Base; 15. Assembly hole; 16. Screw hole; 2. Oil storage chamber; 3. Oil return hole; 20. Upper flange; 30. First cylinder; 40. First partition plate; 50. Second partition plate; 60. Second cylinder; 70. Lower flange; 701. Flange seat; 702. Journal; 703. Exhaust port; 704. Inner hole; 705, Oil tank; 80, Cover plate; 90, Oil pump components; 100, Housing; 110, Crankshaft balance block; 120, Second eccentric shaft; 130, Second roller; 140, First roller; 150, First eccentric shaft; 160, Crankshaft; 1601, Long shaft; 1602, Short shaft; 170, Lateral oil hole; 180, Central oil hole; 200, Motor; 300, Distributor; 400, Refrigeration oil. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0047] like Figure 1 The diagram shown is a structural schematic of a compressor and pump body in the prior art. Figure 1The compressor includes a housing 100, a motor 200 disposed within the housing 100 to drive a crankshaft 160 to rotate, a distributor 300 connected to both the gas outlet and oil outlet of the compressor, and refrigerant oil 400 located in an oil sump at the bottom of the housing 100; such as Figure 2 As shown, a pump body is installed inside the housing 100. The pump body includes a crankshaft balance block 110, a first eccentric shaft 120, a second roller 130, a first roller 140, a first eccentric shaft 150, a crankshaft 160, a long shaft 1601, and a short shaft 1602. To address the problem of large bearing span in large-displacement rotary compressors, which easily leads to bearing component wear, a crankshaft balance block 110 is installed on the short shaft 1602 of the crankshaft 160 to reduce crankshaft bending deformation. Figure 2 As shown, in the prior art, the flow directions of the air passage and oil passage in the pump body of the compressor are as follows: the compressor drives the crankshaft 160 to rotate by the electromagnetic force of the motor 200. The crankshaft 160 drives the oil pump component 90 to pump the lubricating oil (refrigeration oil 400) in the oil pool at the bottom of the housing 100 into the central oil hole 180 of the crankshaft 160. Then, through the lateral oil holes 170 at the root of the long and short shafts of the crankshaft 160, it is pumped to the ends of the inner bore surfaces of the lower flange 70 and the upper flange 20, respectively. Then, through the spiral oil grooves 705 on the upper and lower flanges, it is pumped to the friction pair surfaces of the upper and lower flanges and the long and short shafts of the crankshaft 160, thereby realizing the oil passage lubrication of the bearing.

[0048] The oil flow path in the lower flange cavity is as follows: oil sump → pump oil components → crankshaft center oil hole → side oil hole → spiral oil groove in the inner hole of the lower flange → lower flange cavity;

[0049] The gas discharge path of the lower flange cavity is as follows: compression chamber of the second cylinder 60 (oil-gas mixture) → exhaust port 703 of the lower flange (oil-gas mixture) → second cylinder 60 (oil-gas mixture) → second partition 50 (oil-gas mixture) → first partition 40 (oil-gas mixture) → first cylinder 30 (oil-gas mixture) → upper flange 20 (oil-gas mixture) → upper muffler (oil-gas mixture) → shell cavity (oil-gas mixture).

[0050] To address the poor performance and reliability issues caused by the balance block's oil stirring mechanism, such as... Figure 3 and Figure 4 As shown, the present invention provides a balance block structure, comprising:

[0051] The balance block body 1 is an eccentric structure and is mounted on the short shaft 1602 of the crankshaft 160;

[0052] The oil storage chamber 2 is located on the balance block body 1, specifically on the top surface of the balance block body 1, that is, on the side facing the short axis 1602.

[0053] The top surface of the oil reservoir 2 is higher than the bottom surface of the lower flange 70 sleeved on the short shaft 1602, so as to form an oil passage sealing cavity between the oil reservoir 2, the lower flange 70, and the crankshaft 160. It should be noted that in this embodiment, the lower flange 70 includes a journal 702, which has an inner hole 704. The inner hole 704 is sleeved on the outside of the short shaft 1602, and the inner hole 704 and the short shaft 1602 are fitted with a clearance D, the value of which is 0.022-0.032. When the balance block body 1 is installed to the end of the short shaft 1602, both the journal 702 of the lower flange 70 and the short shaft 1602 will extend into the oil reservoir 2; and the end of the short shaft 1602 will contact and connect with the bottom surface of the oil reservoir 2. Figure 5 , Figure 6 , Figure 8 As shown, three screw holes 16 are evenly arranged at the end of the short shaft 1602, and three assembly holes 15 are evenly arranged on the bottom surface of the oil storage chamber 2. The balance block body 1 and the short shaft 1602 are fixedly connected by screws being screwed into the assembly holes 15 and screw holes 16 in sequence.

[0054] The oil storage chamber 2 is fitted with the outer circumference of the lower flange 70 with a clearance to allow gas to pass through.

[0055] The balance block structure provided by this invention is installed on the short shaft 1602 of the crankshaft 160. It is an eccentric structure and has the structural function of a crankshaft short shaft balance block. It can effectively reduce the weight of the compressor rotor balance block, move the entire balancing system downward, reduce the deflection of the top of the crankshaft, and improve the stability and reliability of the shaft system. By setting an oil storage chamber 2 on the balance block body 1, and the oil storage chamber 2 is located at the end of the short shaft 1602, with the top surface of the oil storage chamber 2 higher than the bottom surface of the lower flange 70 sleeved on the short shaft 1602, an oil passage sealing cavity is formed between the oil storage chamber 2, the lower flange 70, and the crankshaft 160. This can achieve complete separation of the oil and gas passages in the lower flange cavity, effectively solve the problem of oil churning by the crankshaft short shaft balance block, significantly reduce compressor power consumption, and improve compressor performance and reliability.

[0056] Specifically, since the journal 702 of the lower flange 70 extends into the oil reservoir 2, the gap between the oil reservoir 2 and the outer periphery of the lower flange 70 refers to the gap between the side wall of the oil reservoir 2 and the outer periphery of the journal 702. The small gap at this point not only allows gas to pass through, but also forms an oil passage sealing cavity between the oil reservoir 2, the journal 702 and the short shaft 1602, so that the oil will not pass through the gap between the oil reservoir 2 and the journal 1702.

[0057] Furthermore, in this embodiment, as Figure 4 As shown, the single-sided radial clearance δ between the oil reservoir 2 and the outer periphery of the journal 702 of the lower flange 70 is 0.04-0.06mm, which can ensure both sealing performance and the manufacturability of the parts.

[0058] like Figure 6As shown, in this embodiment, the balance block body 1 includes a base 14, an eccentric portion 11, a connecting portion 13, and an oil supply hole 12; In:

[0059] The eccentric part 11 is provided on one side of the base 14;

[0060] Oil storage cavity 2 is located at the top of base 14;

[0061] The connecting part 13 is provided at the bottom of the base 14;

[0062] The oil delivery hole 12 is disposed through the connecting part 13 and communicates with the oil storage chamber 2.

[0063] Specifically, the top of the base 14 is fixedly connected to the lower end face of the short shaft 1602, and the connecting part 13 is connected to the oil pump component 90; the axial center of the base 14 coincides with the center of the oil storage chamber 2, the center of the oil storage chamber 2 coincides with the center of the connecting part 13 and the center oil hole 180 of the crankshaft 160, and the axial center of the eccentric part 11 and the center oil hole 180 of the crankshaft 160 are eccentrically arranged.

[0064] The balance block body 1 drives the oil pumping component 90 to pump oil under the rotation of the crankshaft 160. Because the center of mass of the eccentric part 11 of the balance block body 1 is eccentrically set with the center oil hole 180 of the crankshaft 160, it has the structural function of the crankshaft short shaft balance block. It can effectively reduce the weight of the compressor rotor balance block, so that the entire balance system is lowered, reducing the deflection of the top of the crankshaft and improving the stability and reliability of the shaft system. Its oil storage chamber 2, together with the crankshaft 160 and the lower flange 70, can also realize the separation of oil and gas in the lower flange cavity, reduce power consumption, reduce oil discharge rate, reduce vibration, and improve overall performance and reliability.

[0065] like Figure 3 As shown, the present invention provides a rotor assembly including a crankshaft 160 and a lower flange 70; the crankshaft 160 includes a short shaft 1602, and the lower flange 70 is sleeved on the short shaft 1602; a balance block structure is installed on the short shaft 1602; the journal 702 of the lower flange 70 extends into the oil reservoir 2.

[0066] Furthermore, such as Figure 7 As shown, a return oil hole 3 is provided on the short shaft 1602 corresponding to the position of the oil storage chamber 2, so that the oil in the oil storage chamber 2 can flow back to the central oil hole 180 of the crankshaft 160.

[0067] Furthermore, the oil return hole 3 is a straight hole or an oblique hole to improve the smoothness of oil return.

[0068] Furthermore, such as Figure 7-10 As shown, in another optional embodiment of the present invention, the number of oil return holes 3 is at least one, such as... Figure 7 and Figure 8 As shown, this illustrates a technical solution where one oil return hole 3 is provided; Figure 9 and Figure 10 As shown, a technical solution with six oil return holes 3 is illustrated; all the oil return holes 3 are evenly arranged along the circumferential direction of the short axis 1602.

[0069] like Figure 4 , 7 and Figure 9 As shown, there is a gap between the lower end of journal 702 and the lower end of crankshaft 160. Specifically, there is a gap between the lower end face of journal 702 of lower flange 70 and the lower end face of short shaft 1602 of crankshaft 160, and oil return hole 3 is opened at the gap position.

[0070] Furthermore, crankshaft 160 includes at least one eccentric shaft, such as Figure 2 and Figure 3 As shown, it includes a first eccentric shaft 150 and second eccentric shafts 120, which are arranged at a 180-degree angle. The eccentric portion 11 of the balance block body 1 is arranged at a 180-degree angle to the adjacent eccentric shaft in the horizontal direction, which can effectively balance the mass and torque of the crankshaft eccentric portion, effectively reduce the weight of the rotor balance block, and lower the entire balancing system. While ensuring the balance of the shaft system, the deflection at the top of the crankshaft is minimized. For example, in Figure 3 In the state shown, the eccentric part 11 faces to the left, while the second eccentric shaft 120 is... Figure 3 In this state, the eccentric part 11 is eccentric to the right, and the eccentric part 11 and the second eccentric shaft 120 are symmetrically arranged in the horizontal direction, with a 180° angle between them.

[0071] like Figure 4 As shown, the relationship between the total channel cross-sectional area S of the oil return hole 3 and the cross-sectional area S0 of the central oil hole 180 of the crankshaft 160 is: 0.2≤S / S0≤0.4. If the value is too small, the oil return resistance will be large; if it is too large, the centrifugal force will be large, which will also lead to difficulty in oil return, thereby increasing power consumption and affecting the performance and reliability of the compressor.

[0072] like Figure 4 As shown, furthermore, the upper end face of the balance block body 1 and the lower end face of the journal 702 of the lower flange 70 have an axial height difference h. Ideally, the height difference h ≥ 1 to ensure the radial sealing of the oil storage cavity.

[0073] Furthermore, such as Figure 11 As shown, in an optional embodiment of the present invention, a spiral oil groove 705 for pumped oil to flow upwards is provided on the side wall of the inner hole 704 of the lower flange 70; as Figure 12As shown, in another optional embodiment of the present invention, the inner wall of the lower flange 70's inner bore 704 is provided with several vertical oil grooves 705 that penetrate the inner wall for pumped oil to flow upwards, resulting in a better process. The oil grooves 705 of the lower flange 70 are provided on the inner wall of the inner bore 704. Preferably, the oil grooves 705 are spiral oil groove structures, and the rotation direction of the spiral oil groove from its lower end to its upper end is the same as the rotation direction of the crankshaft 160. Through the oil grooves 705, the lubricating oil pumped into the central oil hole 180 of the crankshaft 160 can be introduced into the friction pair surface between the lower flange 70 and the short shaft 1602, thereby achieving oil circuit lubrication and cooling of the bearing.

[0074] When the oil groove 705 is a spiral oil groove, the spiral direction is the same as the rotation direction of the crankshaft 160.

[0075] The rotor assembly provided by this invention, by setting a balance block structure that enables oil-gas separation in the lower flange cavity, can effectively solve the problem of oil churning by the balance block of the crankshaft short shaft, significantly reduce compressor power consumption and oil level fluctuations, and improve the overall performance and reliability of the compressor.

[0076] like Figure 3 As shown, the present invention provides a pump body including the rotor assembly described above. The pump body also includes a cover plate 80. The oil pump component 90 is fixed to the cover plate 80 by a connector, and the oil pump component 90 can be made of a gear pump; the connecting part 13 of the balance block body 1 is inserted into the oil pump component 90 and is connected to the oil pump component 90 by interference fit using the connecting part 13.

[0077] like Figure 3 As shown, the crankshaft 160 includes a long shaft 1601, an eccentric shaft, an intermediate shaft, and a short shaft 1602, consistent with a conventional rotary compressor. The crankshaft rotates under the electromagnetic force of the compressor motor to drive the pump chamber to periodically draw in, compress, and exhaust air, thereby realizing the operation of the compressor. At the same time, through the central oil hole and side oil holes of the crankshaft, the lubricating oil from the oil sump at the bottom of the compressor is pumped into the surfaces of each friction pair to achieve lubrication of each bearing oil circuit.

[0078] like Figure 11 and Figure 12 As shown, the lower flange 70 includes a flange seat 701, a journal 702, a vent 703, an inner hole 704, and an oil groove 705.

[0079] The lower flange 70 is fitted onto the short shaft 1602 of the crankshaft 160 to support the short shaft 1602; one end of the cover plate 80 is fixedly connected to the lower end face of the lower flange 70, and the other end is fixedly connected to the oil pump component 90; the oil pump component 90 can rotate with the crankshaft 160 to pump oil; the balance block body 1, the short shaft 1602, the lower flange 70, the cover plate 80, and the oil pump component 90 form a closed lower flange cavity; by opening an oil storage cavity 2 on the balance block body 1 and opening at least one radial oil return hole 3 on the outer wall of the short shaft near the oil pump component 90, an oil-gas separation structure is formed in the lower flange cavity. The radial oil return hole 3 is located axially between the lower end face of the lower flange 70 and the lower end face of the short shaft 1602 of the crankshaft 160. One end of the radial oil return hole 3 is connected to the central oil hole 180 of the crankshaft, and the other end is connected to the oil storage chamber 2 of the balance block body 1. The oil in the oil storage chamber 2 can be introduced into the central oil hole of the crankshaft to form an internal circulation oil circuit, thereby realizing the separation of oil and gas in the lower flange cavity.

[0080] The present invention provides a compressor, including the pump body described above, specifically, the compressor is a large displacement rotary compressor.

[0081] The compressor of the present invention has a balance block structure that also improves the crankshaft of a large displacement rotor, thereby further improving the reliability of the compressor.

[0082] Pump body oil and airflow path description:

[0083] like Figure 3 and Figure 4 As shown, the bearing oil circuit of the compressor body in this invention is as follows: The compressor drives the crankshaft to rotate through the electromagnetic force of the motor. The crankshaft drives the balance block body 1 to rotate. The connecting part 13 of the balance block body 1 drives the rotating part of the oil pump component 90 to pump the lubricating oil from the bottom oil sump into the oil delivery hole 12 of the balance block body 1 through the oil pump component 90, and then into the central oil hole 180 of the crankshaft. The oil is then pumped through the lateral oil holes 170 at the root of the long and short shafts of the crankshaft to the ends of the inner bore surfaces of the lower flange 70 and the upper flange 20, respectively. Then, the oil is pumped through the spiral oil grooves 705 on the upper and lower flanges to the friction pair (main and auxiliary bearings) of the upper and lower flanges and the long and short shafts of the crankshaft, thereby realizing the oil circuit lubrication of the main and auxiliary bearings.

[0084] The oil flow path in the lower flange cavity is as follows: oil sump → pump oil components → crankshaft center oil hole → side oil hole → spiral oil groove in the inner hole of the lower flange → oil storage cavity of the balance block body → radial oil return hole → crankshaft center oil hole, which completes the internal circulation oil circuit of the lower flange cavity, realizes complete separation of oil and gas circuits in the lower flange cavity, effectively reduces the oil discharge rate, and avoids the eccentric concave disk from stirring the oil as the crankshaft rotates, reducing shaft system deflection, which is conducive to reducing noise, improving performance and compressor reliability.

[0085] In addition, the exhaust port 703 of the lower flange discharges an oil-gas mixture. The balance block structure of the present invention can allow the oil and gas in the oil-gas mixture discharged from the lower flange to enter the oil storage chamber 2 of the balance block body 1 through the gap between the balance block body 1 and the lower flange journal under the action of pressure difference and gravity. Then, together with the oil coming down from the spiral oil groove of the lower flange, it enters the crankshaft center oil hole through the radial oil return hole of the short shaft, completing the internal circulation oil circuit, realizing the separation of oil and gas in the exhaust of the lower flange, reducing the oil content and exhaust resistance in the exhaust, reducing the oil discharge rate, and improving the overall performance and reliability of the compressor.

[0086] The gas discharge path of the lower flange cavity is as follows: second cylinder compression chamber (oil-gas mixture) → lower flange exhaust port (oil-gas mixture) → second cylinder (oil-gas separated gas) → second partition (oil-gas separated gas) → first partition (oil-gas separated gas) → first cylinder (oil-gas separated gas) → upper flange (oil-gas separated gas) → upper muffler (oil-gas separated gas) → shell cavity (oil-gas separated gas).

[0087] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A balance block structure, characterized in that, include: The balance weight body is an eccentric structure and is mounted on the short shaft of the crankshaft; An oil storage chamber is formed on the balance block body. The lower end of the journal of the lower flange and the lower end of the short shaft both extend into the oil storage chamber. There is a gap between the lower end of the journal and the lower end of the short shaft. An oil return hole is provided on the short shaft corresponding to the gap position. An oil delivery hole is provided on the bottom surface of the oil storage chamber. The lower flange is sleeved on the short shaft to support the short shaft, and the top surface of the oil reservoir is higher than the bottom surface of the lower flange journal to form an oil passage sealing cavity between the oil reservoir, the lower flange and the crankshaft. The oil storage chamber is fitted with a clearance between the lower flange and the outer circumference to allow gas to pass through.

2. The balance block structure according to claim 1, characterized in that, The gap δ between the oil storage cavity and the outer periphery of the lower flange is 0.04-0.06 mm.

3. The balance block structure according to claim 1, characterized in that, The balance block body includes a base, an eccentric portion, a connecting portion, and an oil delivery port; wherein: The eccentric portion is disposed on one side of the substrate; The oil storage cavity is formed at the top of the substrate; The connecting part is disposed at the bottom of the base; The oil delivery hole is disposed through the connecting part and communicates with the oil storage cavity.

4. A rotor assembly, characterized in that, It includes a crankshaft and a lower flange; the crankshaft includes a short shaft, and the lower flange is sleeved on the short shaft; the balance block structure as described in any one of claims 1-3 is installed on the short shaft.

5. The rotor assembly according to claim 4, characterized in that, The oil return hole is either a straight hole or an oblique hole.

6. The rotor assembly according to claim 4, characterized in that, The number of oil return holes is at least one, and all the oil return holes are evenly arranged along the circumferential direction of the minor axis.

7. The rotor assembly according to claim 4, characterized in that, The crankshaft includes at least one eccentric shaft, and the eccentric portion of the balance block body is arranged at a 180° angle to the adjacent eccentric shaft in the horizontal direction.

8. The rotor assembly according to claim 6, characterized in that, The relationship between the total channel cross-sectional area S of the oil return hole and the cross-sectional area S0 of the central oil hole of the crankshaft is: 0.2≤S / S0≤0.

4.

9. The rotor assembly according to claim 4, characterized in that, The upper end face of the balance block body and the lower end face of the journal of the lower flange have an axial height difference h.

10. The rotor assembly according to claim 9, characterized in that, The height difference h ≥ 1.

11. The rotor assembly according to claim 4, characterized in that, The inner wall of the lower flange is provided with a spiral oil groove or several vertical oil grooves for the pumped oil to flow upwards; when the oil groove is a spiral oil groove, the spiral direction is the same as the rotation direction of the crankshaft.

12. A pump body, characterized in that, Includes the rotor assembly as described in any one of claims 4-11.

13. A compressor, characterized in that, Includes the pump body as described in claim 12.

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