Compressor

Abstract

A compressor, comprising a housing (2), a drive motor (200), and a counterweight (100). The drive motor (200) comprises a rotor (1), a stator core (31), and a winding (32); the counterweight (100) comprises a main body portion (10) mounted at the upper end of the rotor (1); the main body portion (10) is provided with second through-flow holes (b) located on the peripheral side of a central via hole (a) and communicated with first through-flow holes (d) in the rotor (1); the distance between the top of the winding (32) and the top of the stator core (31) is L; the minimum thickness of the counterweight (100) is set to be t≥1 / 4*L; and an oil-gas mixture flows out through the first through-flow holes (d) of the rotor (1) and then enters the second through-flow holes (b). The structure solves the problem in existing compressors that lubricating oil cannot flow back in time and is easily discharged along with high-pressure gas.

Description

compressor

[0001] Related applications

[0002] This application claims priority to Chinese Patent Application No. 202411062836.4, filed on August 2, 2024, and Chinese Patent Application No. 202421872962.1, filed on August 2, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of compressor technology, and in particular to a compressor. Background Technology

[0004] In a rotary compressor, when the compressor is working, the motor rotor rotates at high speed. The high-speed gas-liquid mixture discharged from the rotor's flow holes, along with the lubricating oil, is subjected to inertial force and centrifugal force, and moves outwards in all directions. It then flows down from the gap between the inner wall of the compressor housing and the stator, returning to the oil sump to participate in the lubrication cycle. Meanwhile, the high-pressure refrigerant gas can be discharged through the outlet at the top of the compressor, ultimately achieving oil-gas separation.

[0005] However, when the oil-gas mixture is thrown out from the rotor's flow hole, the existing compressor cannot return the oil normally along the tangential edge between the stator and the inner wall of the housing in time. This causes the separated liquid lubricating oil to be blown up by the gas discharged from the flow hole and discharged from the compressor with the high-pressure gas, which increases the amount of lubricating oil discharged from the compressor and is not conducive to the lubrication and sealing of the internal moving parts. Summary of the Invention

[0006] The main purpose of this application is to propose a compressor that aims to solve the problem that in existing compressors, the lubricating oil cannot flow back in time and is easily discharged with high-pressure gas.

[0007] To achieve the above objectives, the compressor proposed in this application includes:

[0008] case;

[0009] A drive motor, disposed within the housing, includes a rotor and a stator assembly disposed around the rotor. The rotor has a first flow-through hole. The stator assembly includes a stator core and windings wound around the stator core. The rotor also has the first flow-through hole.

[0010] The balance block includes a main body, which has a first end face and a second end face that are arranged opposite to each other. The first end face is mounted on the upper end of the rotor. The main body is provided with a central through hole for the crankshaft to pass through, and a second through hole located around the central through hole and communicating with a first through hole on the rotor. The second through hole passes through the two end faces of the main body.

[0011] Wherein, the distance between the top of the winding and the top of the stator core is L, and the minimum thickness of the balance block is t, where t≥1 / 4*L.

[0012] In one implementation, t≤L.

[0013] In one embodiment, the main body is provided with a counterweight hollowed-out section.

[0014] In one embodiment, the second flow hole forms the counterweight hollow portion.

[0015] In one embodiment, a plurality of second flow holes are provided, and the plurality of second flow holes are arranged at intervals along the circumference of the main body, and at least some of the second flow holes are arranged with different cross-sectional sizes.

[0016] In one embodiment, the plurality of second flow holes are non-uniformly arranged in the circumferential direction of the main body, so that the center of gravity of the balance block is offset from its geometric center.

[0017] In one embodiment, the balance block further includes a counterweight protrusion protruding from the second end face of the main body, the counterweight protrusion being offset from the center of the main body, and the main body being provided with the second flow hole.

[0018] In one embodiment, the volume of the second flow orifice is V1, the volume of the balance block is V, and V1 ≤ 1 / 3V.

[0019] In one embodiment, the balance block is further provided with a second connecting hole that penetrates the two end faces of the balance block and corresponds to the first connecting hole on the rotor.

[0020] In one embodiment, the cross-sectional area of ​​the second flow orifice is set to be greater than or equal to the cross-sectional area of ​​the first flow orifice; and / or,

[0021] The rotor is provided with a shaft hole for the crankshaft to pass through, and the area of ​​the central through hole is set to be greater than or equal to the area of ​​the shaft hole.

[0022] In one embodiment, the second end face of the main body has a guide slope disposed on the side of the second flow hole away from the central hole, and the guide slope is inclined away from the first end face in the direction of the middle of the main body outward.

[0023] In one embodiment, the guide ramp is configured as an annular shape and is arranged around the periphery of the second flow hole.

[0024] In one embodiment, the compressor includes a carbon dioxide compressor. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application 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 this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 is a cross-sectional schematic diagram of an embodiment of a compressor in the related art;

[0027] Figure 2 is a cross-sectional schematic diagram of an embodiment of the compressor provided in this application;

[0028] Figure 3 is a cross-sectional schematic diagram of an embodiment of the rotor and balance block provided in this application;

[0029] Figure 4 is a three-dimensional schematic diagram of the rotor in Figure 3;

[0030] Figure 5 is a structural schematic diagram of an embodiment of the balance block provided in this application;

[0031] Figure 6 is a structural schematic diagram of another embodiment of the balance block provided in this application.

[0032] Explanation of icon numbers:

[0033] 100', Balance weight;

[0034] 100. Balance block; 10. Main body; 101. First end face; 102. Second end face; a. Central through hole; b. Second flow hole; c. Second connecting hole; 11. Counterweight protrusion;

[0035] 200. Drive motor; 1. Rotor; d. First flow passage; e. Shaft hole; f. First connecting hole;

[0036] 300. Compressor; 2. Housing; 3. Stator assembly; 31. Stator core; 32. Winding; 4. Silencer.

[0037] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Embodiments of the present invention

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0039] If the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0040] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0041] In a rotary compressor, during operation, the motor rotor rotates at high speed. High-speed gas-liquid mixture discharged from the rotor's flow holes, along with the lubricating oil, is propelled by inertia and centrifugal force, diverging outwards and flowing down through the gap between the compressor housing's inner wall and the stator, returning to the oil sump to participate in the lubrication cycle. Meanwhile, the high-pressure refrigerant gas can be discharged through the outlet at the top of the compressor, ultimately achieving oil-gas separation. However, in existing compressors, when the oil-gas mixture is ejected from the rotor's flow holes, it cannot promptly return along the tangential edge between the stator and the housing's inner wall. This causes the separated liquid lubricating oil to be blown up by the subsequent gas discharged from the flow holes and discharged from the compressor with the high-pressure gas, increasing the amount of lubricating oil discharged and negatively impacting the lubrication and sealing of internal moving parts.

[0042] This application proposes a compressor designed to solve the problem that in existing compressors, lubricating oil cannot flow back in time and is easily discharged with high-pressure gas.

[0043] Please refer to Figures 2 and 3. In one embodiment of this application, the compressor includes a housing 2, a drive motor 200, and a balance block 100. The drive motor 200 is disposed inside the housing 2 and includes a rotor 1 rotatably arranged along a rotation axis extending vertically, and a stator assembly 3 disposed around the rotor 1. The rotor 1 has a first flow hole d. The stator assembly 3 includes a stator core 31 and a winding 32 wound around the stator core 31. The center of gravity of the balance block 100 is offset from its geometric center. The balance block 100 includes a main body 10. The body 10 has a first end face 101 and a second end face 102 arranged opposite to each other. The first end face 101 is installed on the upper end of the rotor 1. The body 10 is provided with a central through hole a for the crankshaft to pass through, and a second through hole b located on the periphery of the central through hole a for corresponding to the first through hole d on the rotor 1. The second through hole b is arranged through the two end faces of the body 10. The distance between the top of the winding 32 and the top of the stator core 31 is L, and the minimum thickness of the balance block 100 is t, where t≥1 / 4*L.

[0044] After the refrigerant and lubricating oil are discharged from the compressor cylinder, they pass through the muffler 4 and are discharged upwards from the hole at the top of the muffler 4 into the flow hole of the rotor 1. Then, oil-gas separation is achieved above the rotor 1 to recover as much lubricating oil as possible and prevent excessive oil from entering the condenser and evaporator, which would affect the heat exchange efficiency. During the recovery of lubricating oil, due to inertia and gravity, the oil-gas mixture disperses and flows in all directions under high-speed rotation, and is thrown towards the inner wall of the housing 2. The oil droplets in it are subjected to the combined action of centrifugal force and gravity, and flow down along the gap between the inner wall of the housing 2 of the compressor 300 and the stator assembly 3, and finally collect in the oil sump at the bottom.

[0045] Normal circulation path of lubricating oil: The lubricating oil in the oil sump enters the compressor 300 chamber of the pump body through the oil supply hole at the bottom of the crankshaft to participate in the lubrication and sealing of the operating parts. Some of the lubricating oil will enter the compression chamber inside the compressor pump and be discharged through the silencer 4 with the high-pressure gas. At this time, the gas-liquid mixture enters the upper space of the stator assembly 3 through the flow hole of the rotor 1. Under the action of gravity separation, centrifugal separation, and impact separation, the liquid oil droplets of the gas-liquid mixture in the upper space of the stator assembly 3 are separated. The separated lubricating oil flows back to the oil sump at the bottom of the compressor 300 through the pre-reserved tangential gap between the stator and the housing 2 to participate in the subsequent oil supply. This is the complete lubricating oil circulation process inside the compressor 300.

[0046] To compress the refrigerant by working the compressor cylinder of compressor 300, a motor is positioned above the compressor cylinder. The motor rotor 1 drives the crankshaft to rotate, which in turn drives the compressor pump to compress the refrigerant. The motor stator is located around the rotor 1, and a winding 32 is wound on the stator. The winding 32 protrudes from the end face of the stator. While the end face of rotor 1 is generally flush with the end face of the stator, the end of the winding 32 on the stator is higher than the end face of rotor 1. After the oil-gas mixture is ejected through the flow hole of rotor 1, the lubricating oil moves radially along rotor 1 due to centrifugal force. Since the winding 32 is located between rotor 1 and compressor housing 2, some of the lubricating oil is blocked from continuing to move towards compressor housing 2. This causes the lubricating oil to flow back along the inner wall of winding 32 or rebound back to the flow hole of rotor 1, where it is then blown up by the gas subsequently discharged through the flow hole and discharged from compressor 300 with the high-pressure gas, entering the condenser and evaporator.

[0047] The height of the main body 10 can be appropriately designed according to the height of the protrusion of the winding 32 to ensure that the lubricating oil thrown out from the second flow hole b can at least partially pass over the winding 32. For example, the lubricating oil can completely pass over the winding 32.

[0048] When the oil-gas mixture is ejected from the second flow hole b, it has an upward velocity as well as a radial velocity along the balance block 100. Thus, the oil-gas mixture combines to form an outward and upward tilting velocity. Therefore, the minimum thickness of the balance block 100 is set to be greater than or equal to 1 / 4L to ensure that when the lubricating oil is centrifugally thrown out, it can pass over the top of the stator winding 32.

[0049] In the technical solution of this application, a balance block 100 is installed on the top of the rotor 1. The center of gravity of the balance block 100 is offset from its geometric center, which can balance the centrifugal force in the radial direction of the crankshaft during operation by the rolling piston and gas force. The balance block 100 includes a main body 10, and a central through hole a for the crankshaft to pass through is provided on the main body 10, and a second through hole b is provided on the periphery of the central through hole a for corresponding to the first through hole d on the rotor 1. The second through hole b is provided through the two end faces of the main body 10. The distance between the top of the winding 32 and the top of the stator core 31 is L. The minimum thickness of the balance block 100 is set to t≥1 / 4*L. After the oil-gas mixture flows out through the first flow hole d of the rotor 1, it will enter the second flow hole b. When the rotor 1 rotates at high speed, the lubricating oil is thrown out from the top of the balance block 100. Because the lubricating oil is ejected at a higher height, it can pass over the top of the winding 32 on the outer stator and return normally along the tangent edge between the stator and the inner wall of the housing 2 in time. This avoids the lubricating oil being blocked by the winding 32 and flowing back to the top of the rotor 1, and then being blown up by the gas discharged from the flow hole. This solves the problem in the existing compressor 300 that the lubricating oil cannot return in time and is easily discharged with the high-pressure gas.

[0050] Furthermore, in this embodiment, t≤L. Setting the minimum thickness of the balance block 100 to less than L balances centrifugal force and reduces costs. However, if the balance block 100 is set too high, the space above the rotor 1 within the compressor 300 will be too small, hindering oil-gas mixture separation. The oil will be too close to the outlet at the top of the compressor 300, preventing sufficient separation and allowing it to be directly discharged instead of circulating back to the bottom along the inner wall of the casing 2. This could lead to the oil easily entering the condenser and evaporator.

[0051] Furthermore, in another embodiment, the second end face 102 of the main body 10 has a guide slope disposed on the side of the second flow hole b away from the central hole. The guide slope is inclined away from the first end face 101 in the direction outward from the middle of the main body 10. With this configuration, when the lubricating oil is thrown out from the second flow hole b, the lubricating oil moves upward along the guide slope. After the lubricating oil leaves the second end face 102 of the main body 10, it can continue to move upward under inertia. Thus, even if the main body 10 can be made relatively thin, the lubricating oil can also pass over the top of the winding 32.

[0052] Furthermore, in this embodiment, the guide ramp is configured as an annular shape and is arranged around the periphery of the second flow hole b. Thus, regardless of the direction from which the lubricating oil is ejected, it can move obliquely upwards along the annular guide ramp, ensuring that when the lubricating oil leaves the second flow hole b in any direction, it can pass over the winding 32 on the stator.

[0053] Please refer to Figure 1. In related technologies, in order to balance the centrifugal force present in the radial direction of the crankshaft, the balance block 100' is mostly crescent-shaped and installed on one side of the top of the rotor. When rotating at high speed, it disturbs the flow field, forming a low-pressure area above the upper end face of the rotor. Since the bottom of the crankshaft extends into the oil sump at the bottom of the compressor housing, and a hollow oil delivery channel is provided in the middle of the crankshaft, the pressure below the rotor is higher than the pressure above. Furthermore, the low-pressure area formed by the disturbance of the flow field by the balance block 100' causes more lubricating oil in the oil sump to move upward through the oil holes inside the crankshaft under the action of pressure difference, which also affects the stability of the oil sump.

[0054] In one embodiment, the main body 10 is provided with a counterweight hollow section. By providing the counterweight hollow section inside the main body 10, the mass on one side of the counterweight hollow section is smaller, thereby shifting the center of gravity of the balance block 100. The balance block 100 does not disturb the flow field, so a low-pressure area is not formed above the top, and the pressure difference between the top and bottom of the rotor 1 does not increase, and the lubricating oil in the oil sump is not excessively transported to the oil delivery channel.

[0055] Specifically, in this embodiment, the second flow hole b forms the counterweight hollow portion. Because the second flow hole b is located beside the central through hole a of the main body 10, the main body 10 has a smaller mass on the side where the flow hole is located, causing the center of gravity to shift towards the other side that is symmetrical about the central through hole a with respect to the second flow hole b.

[0056] In one embodiment, multiple second flow holes b are provided, and the multiple second flow holes b are arranged at circumferential intervals along the main body 10, with at least some of the second flow holes b having different cross-sectional sizes. Thus, with the multiple second flow holes b symmetrically arranged about the central through hole a, the cross-section of one side of the second flow hole b can be set to be larger, and the center of gravity of the balance block 100 shifts to the side where the cross-section of the second flow hole b is smaller.

[0057] The cross-section of each of the flow holes can be set to a circle, a polygon, or an irregular shape. The cross-section of each of the multiple second flow holes b can be set to the same shape. Of course, some of the cross-sections of the second flow holes b can be set to the same shape, while the cross-sections of the other part of the second flow holes b can be set to another shape, ultimately causing the center of gravity of the balance block 100 to deviate from its geometric center.

[0058] In another embodiment, multiple second flow holes b are provided, and these holes are non-uniformly distributed along the circumference of the main body 10, so that the center of gravity of the balance block 100 is offset from its geometric center. Providing a larger number of second flow holes b on one side of the main body 10 that is symmetrical about its center can reduce the weight on that side, while the side with fewer second flow holes b is heavier. By adjusting the distribution density of the second flow holes b, the center offset of the balance block 100 can be flexibly adjusted.

[0059] In another embodiment, referring to FIG5, the balance block 100 further includes a counterweight protrusion 11 protruding from the second end face 102 of the main body 10. The counterweight protrusion 11 is disposed off-center from the center of the main body 10, and the main body 10 is provided with the second flow hole b.

[0060] This facilitates the processing of the second flow passage b. In particular, when there are multiple second flow passages b, the number, shape, and size of the multiple flow passages can be set to be equivalent to the number, shape, and size of the multiple first flow passages d on the rotor 1. The center of gravity of the balance block 100 can be shifted by counterweighting only through the counterweight protrusion 11.

[0061] Specifically, in this embodiment, the volume of the second flow hole b is V1, the volume of the balance block 100 is V, and V1≤1 / 3V.

[0062] The volume of the balance block 100 refers to the space occupied by the outer shape of the balance block 100. When the balance block 100 has hollow structures such as holes and slots inside, the volume of the balance block 100 includes the volume occupied by the hollow structures such as holes and slots.

[0063] The volume of the second flow hole b is set to be less than or equal to 1 / 3 of the volume of the balance block 100. This avoids setting the second flow hole b too large, which would reduce the mass of the balance block 100 itself too much and make it difficult to achieve the purpose of significantly adjusting the center of gravity of the balance block 100.

[0064] Further, referring to Figures 4 and 5, to facilitate fixing the balance block 100 to the rotor 1, the balance block 100 is also provided with two end faces that penetrate the balance block 100, and a second connecting hole c corresponding to the first connecting hole f on the rotor 1. The balance block 100 is connected by a connector passing through the first connecting hole f and the second connecting hole c.

[0065] The balance block 100 and the rotor 1 can be fixed by bolt connection or by riveting. Of course, other possible connection methods can also be used. The specific method can be determined according to the actual situation. This specification does not limit this embodiment.

[0066] In this embodiment, the cross-sectional area of ​​the second flow hole b is set to be greater than or equal to the cross-sectional area of ​​the first flow hole d. This prevents interference and obstruction between the oil-gas mixture passing through the first flow hole d and the bottom wall of the balance block 100 during the upward movement of the oil-gas mixture, allowing the oil-gas mixture in the first flow hole d to flow smoothly into the second flow hole b.

[0067] In this embodiment, the rotor 1 is provided with a shaft hole e for the crankshaft to pass through, and the area of ​​the central through hole a is set to be greater than or equal to the area of ​​the shaft hole e.

[0068] In this way, interference with the bottom wall of the balance block 100 is avoided during the process of the oil-gas mixture rising from the shaft hole e, so that the oil-gas mixture in the shaft hole e can flow smoothly into the central through hole a.

[0069] Specifically, the compressor 300 includes a carbon dioxide compressor, which is a special compressor that uses carbon dioxide as a working medium. It is usually used in a refrigeration system called "carbon dioxide transcritical cycle". It does not damage the ozone layer. In some application scenarios, carbon dioxide systems can achieve higher energy efficiency than traditional refrigeration systems.

[0070] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A compressor, wherein, The compressor includes: case; A drive motor, disposed within the housing, includes a rotor and a stator assembly disposed around the rotor. The rotor has a first flow-through hole. The stator assembly includes a stator core and windings wound around the stator core. The balance block includes a main body, which has a first end face and a second end face that are arranged opposite to each other. The first end face is mounted on the upper end of the rotor. The main body is provided with a central through hole for the crankshaft to pass through, and a second through hole located around the central through hole and communicating with the first through hole. The second through hole passes through the two end faces of the main body. Wherein, the distance between the top of the winding and the top of the stator core is L, and the minimum thickness of the balance block is t, where t≥1 / 4*L.

2. The compressor as claimed in claim 1, wherein, t≤L.

3. The compressor as described in claim 1 or 2, wherein, The main body is provided with a counterweight hollow section.

4. The compressor as claimed in any one of claims 1 to 3, wherein, The second flow hole forms the counterweight hollow section.

5. The compressor as claimed in any one of claims 1 to 4, wherein, The second flow passage is provided in multiple ways, and the multiple second flow passages are arranged at intervals along the circumference of the main body, with at least some of the second flow passages having different cross-sectional sizes.

6. The compressor as claimed in any one of claims 1 to 4, wherein, Multiple second flow holes are provided. In the circumferential direction of the main body, the multiple second flow holes are non-uniformly distributed so that the center of gravity of the balance block is offset from its geometric center.

7. The compressor as claimed in any one of claims 1 to 6, wherein, The balance block also includes a counterweight protrusion protruding from the second end face of the main body, the counterweight protrusion being offset from the center of the main body.

8. The compressor as claimed in any one of claims 1 to 7, wherein, The volume of the second flow orifice is V1, and the volume of the balance block is V, where V1 ≤ 1 / 3V.

9. The compressor as claimed in any one of claims 1 to 8, wherein, The balance block is also provided with a second connecting hole that penetrates the two end faces of the balance block and corresponds to the first connecting hole on the rotor.

10. The compressor as claimed in any one of claims 1 to 9, wherein, The cross-sectional area of ​​the second flow passage is set to be greater than or equal to the cross-sectional area of ​​the first flow passage.

11. The compressor as claimed in any one of claims 1 to 10, wherein, The rotor is provided with a shaft hole for the crankshaft to pass through, and the area of ​​the central through hole is set to be greater than or equal to the area of ​​the shaft hole.

12. The compressor as claimed in any one of claims 1 to 11, wherein, The second end face of the main body has a guide slope disposed on the side of the second flow hole away from the center hole, and the guide slope is inclined away from the first end face in the direction of the middle of the main body outward.

13. The compressor as claimed in claim 12, wherein, The guide slope is configured as an annular shape and is arranged around the periphery of the second flow hole.

14. The compressor as claimed in any one of claims 1 to 13, wherein, The compressor includes a carbon dioxide compressor.

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