Compressor

Abstract

The utility model discloses a compressor, relates to compressor technical field, compressor includes casing, drive motor and balance weight, drive motor includes rotor, stator core and winding, balance weight includes the main part that is installed at the rotor upper end, the main body part is provided with second through-flow holes which are located on the peripheral side of the central via hole and are communicated with the first through-flow holes in the rotor, 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 set to be t > = 1 / 4 * L. When an oil-gas mixture flows out of the first through-flow holes of the rotor, the oil-gas mixture enters the second through-flow holes. Lubricating oil is thrown out from the top of the balance block, and the lubricating oil can cross the top of the winding and normally return along the cut edge of the stator and the inner wall of the shell due to the fact that the emitting height of the lubricating oil is higher, and the thrown lubricating oil is prevented from being blocked by the winding, flowing back to the top of the rotor and then blown up by gas subsequently exhausted by the through-flow hole. The problem that lubricating oil of an existing compressor cannot flow back in time and is easily exhausted along with high-pressure gas is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a compressor. Background Art

[0002] In a rotary compressor, when the compressor is working, the motor rotor rotates at high speed, and the high-speed gas and liquid discharged from the flow holes of the rotor and the lubricating oil are affected by inertia and centrifugal force, diverging along the four sides and flowing down from the gap between the inner wall of the compression shell and the stator, returning to the oil pool and participating in the lubrication cycle, while the high-pressure refrigerant gas can be discharged through the air outlet at the top of the compressor, and finally the oil and gas separation can be achieved.

[0003] However, in existing compressors, when the oil-gas mixture is thrown out from the flow holes of the rotor, the oil cannot be returned normally along the cut edges of the stator and the inner wall of the casing in time, so that the separated liquid lubricating oil is blown up by the gas subsequently discharged from the flow holes and discharged from the compressor along with the high-pressure gas, which increases the discharge amount of the compressor lubricating oil and is not conducive to the lubrication and sealing of the internal running parts. Utility Model Content

[0004] The main purpose of the utility model is to provide a compressor, aiming to solve the problem in existing compressors that lubricating oil cannot flow back in time and is easily discharged along with high-pressure gas.

[0005] To achieve the above-mentioned purpose, the compressor proposed by the present invention comprises:

[0006] case;

[0007] a drive motor disposed in the housing, comprising a rotor and a stator assembly disposed on the periphery of the rotor, wherein the rotor is provided with a first through-hole, the stator assembly comprises a stator core and a winding disposed on the periphery of the stator core, and the rotor is provided with a first through-hole; and

[0008] A balancing weight, the balancing weight comprising a main body having a first end face and a second end face arranged opposite to each other, the first end face being mounted on the upper end of the rotor, the main body being provided with a central through hole for the crankshaft to pass through, and a second through hole located circumferentially of the central through hole and communicating with the first through hole on the rotor, the second through hole being provided through both end faces of the main body;

[0009] The distance between the top of the winding and the top of the stator core is L, the minimum thickness of the balancing block is t, and t≥1 / 4*L.

[0010] In one embodiment, t≤L.

[0011] In one embodiment, the main body is provided with a counterweight hollow portion.

[0012] In one embodiment, the second through-hole forms the counterweight hollow portion.

[0013] In one embodiment, a plurality of the second through-flow holes are provided, and the plurality of the second through-flow holes are spaced apart along the circumference of the main body, and cross-sectional sizes of at least some of the second through-flow holes are different.

[0014] In one embodiment, the plurality of second through-flow holes are unevenly distributed in the circumferential direction of the main body, so that the center of gravity of the balancing weight is offset from its geometric center.

[0015] In one embodiment, the balancing weight further includes a counterweight protrusion protruding from the second end surface of the main body, the counterweight protrusion is arranged offset from the center of the main body, and the main body is provided with the second flow hole.

[0016] In one embodiment, the volume of the second through-hole is V1, the volume of the balancing block is V, and V1≤1 / 3V.

[0017] In one embodiment, the balancing block is further provided with a second connection hole which passes through two end surfaces of the balancing block and is provided corresponding to the first connection hole on the rotor.

[0018] In one embodiment, the cross-sectional area of ​​the second through-hole is set to be greater than or equal to the cross-sectional area of ​​the first through-hole; and / or,

[0019] 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.

[0020] In one embodiment, the second end face of the main body has a guide slope provided on a side of the second through-hole away from the central hole, and the guide slope is inclined in a direction outward from the middle of the main body away from the first end face.

[0021] In one embodiment, the guide slope is configured to be annular and is arranged around the periphery of the second through-hole.

[0022] In one embodiment, the compressor comprises a carbon dioxide compressor.

[0023] In the technical solution of the present invention, the driving motor includes a rotor, a stator core and a winding. A balancing block is installed on the top of the rotor. The center of gravity of the balancing block is set away from its geometric center, which can balance the centrifugal force in the radial direction of the crankshaft by the rolling piston and the gas force during operation. The balancing block includes a main body, and a central through hole for the crankshaft to pass through is provided on the main body. A second through hole is provided on the circumferential side of the central through hole for corresponding to the first through hole on the rotor. The second through hole is set through the two end faces of the main body. Between the top of the winding and the top of the stator core, there is a balancing block. The distance is L, and the minimum thickness of the balancing block is set to t≥1 / 4*L. After the oil-gas mixture flows out through the first flow hole of the rotor, it will enter the second flow hole. When the rotor rotates at high speed, the lubricating oil is thrown out from the top of the balancing block. Because the height of the lubricating oil is higher, it can pass over the top of the winding on the outer stator and return to the oil normally along the cut edge of the stator and the inner wall of the shell in time, avoiding the thrown lubricating oil being blocked by the winding and flowing back to the top of the rotor and then being blown up by the gas subsequently discharged from the flow hole, so as to solve the problem in the existing compressor that the lubricating oil cannot flow back in time and is easily discharged with the high-pressure gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0025] Figure 1 It is a cross-sectional schematic diagram of an embodiment of a compressor in the related art;

[0026] Figure 2 A schematic cross-sectional view of an embodiment of a compressor provided by the present utility model;

[0027] Figure 3 A cross-sectional schematic diagram of an embodiment of a rotor and a balancing weight provided by the present invention;

[0028] Figure 4 for Figure 3 A three-dimensional schematic diagram of the rotor in FIG;

[0029] Figure 5 A structural diagram of an embodiment of a balancing weight provided by the present utility model;

[0030] Figure 6 This is a structural schematic diagram of another embodiment of the balancing weight provided by the utility model.

[0031] Description of Figure Numbers:

[0032] 100', balance weight;

[0033] 100, balancing weight; 10, main body; 101, first end surface; 102, second end surface; a, center through hole; b, second through hole; c, second connecting hole; 11, counterweight protrusion;

[0034] 200, drive motor; 1, rotor; d, first flow hole; e, shaft hole; f, first connecting hole;

[0035] 300. Compressor; 2. Housing; 3. Stator assembly; 31. Stator core; 32. Winding; 4. Muffler.

[0036] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 shall fall within the scope of protection of the present invention.

[0038] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] In a rotary compressor, when the compressor is working, the motor rotor rotates at high speed. The high-speed gas and liquid discharged from the rotor's flow holes, and the lubricating oil is subjected to inertia and centrifugal force, diverging along the four sides and flowing down from the gap between the inner wall of the compression shell and the stator, returning to the oil pool and participating in the lubrication cycle. The high-pressure refrigerant gas can be discharged through the air outlet at the top of the compressor, and finally the oil and gas separation can be achieved. However, when the oil and gas mixture is thrown out of the rotor's flow holes, the existing compressor cannot return the oil normally along the cut edge between the stator and the inner wall of the shell in time. As a result, the separated liquid lubricating oil is blown up by the gas discharged from the flow holes and discharged from the compressor along 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 internal operating parts.

[0041] The utility model provides a compressor, aiming to solve the problem in the existing compressor that lubricating oil cannot flow back in time and is easily discharged along with the high-pressure gas.

[0042] See also Figure 2 and Figure 3 In one embodiment of the present invention, the compressor includes a housing 2, a drive motor 200 and a balancing block 100. The drive motor 200 is disposed in the housing 2 and includes a rotor 1 rotatably arranged along a rotation axis extending in an up-down direction, and a stator assembly 3 disposed on the periphery of the rotor 1. The rotor 1 is provided with a first through-hole d. The stator assembly 3 includes a stator core 31 and a winding 32 wound around the periphery of the stator core 31. The center of gravity of the balancing block 100 is offset from its geometric center. The balancing block 100 includes a main body 10, the main body 1 0 has a first end face 101 and a second end face 102 arranged opposite to each other, the first end face 101 is mounted on the upper end of the rotor 1, the main body 10 is provided with a central through hole a for passing the crankshaft, and a second through hole b located on the circumference of the central through hole a and 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; wherein, 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 balancing block 100 is t, t ≥ 1 / 4*L.

[0043] It should be noted that after the refrigerant and lubricating oil are discharged from the compression cylinder, they pass through the muffler 4 and then flow upward from the hole at the top of the muffler 4 into the flow hole of the rotor 1. Then, oil and 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. When recovering the lubricating oil, the oil-gas mixture, affected by inertia and gravity, diverges and flows in all directions under high-speed rotation and is thrown toward the inner wall of the shell 2. The oil droplets therein are affected by the combined effects of centrifugal force and gravity and flow down along the gap between the inner wall of the shell 2 of the compressor 300 and the stator assembly 3, eventually converging into the oil pool at the bottom.

[0044] It should also be noted that the normal circulation path of the lubricating oil is: the lubricating oil in the oil pool enters the pump compressor 300 cavity from the oil supply hole at the bottom of the crankshaft to participate in the lubrication and sealing of the running parts. Some of the lubricating oil will enter the compression chamber in the compression pump and be discharged with the high-pressure gas through the muffler 4; at this time, the gas-liquid mixture enters the upper space of the stator assembly 3 through the flow hole of the rotor 1; the gas-liquid mixture in the upper space of the stator assembly 3 is separated by gravity separation, centrifugal separation, impact separation, etc., and the liquid oil droplets are separated; the separated lubricating oil flows back to the oil pool at the bottom of the compressor 300 from the trimming gap reserved inside the stator and the shell 2 to participate in the subsequent oil supply. This is a complete lubricating oil circulation process inside the compressor 300.

[0045] In order to work the compression cylinder of compressor 300 and compress the refrigerant, a motor is positioned above the compression cylinder. The motor's rotor 1 drives the crankshaft, which in turn drives the compressor pump to compress the refrigerant. The motor's stator is positioned around the periphery of rotor 1. Windings 32 are wound around the stator, projecting from the end face of the stator. Since the end faces of rotor 1 and stator are generally flush, the ends of windings 32 on the stator are positioned higher than the end face of rotor 1. After the oil-gas mixture is ejected through the flow holes of rotor 1, centrifugal force causes the lubricating oil to flow radially along rotor 1. However, windings 32, located between rotor 1 and compressor 300 casing 2, prevent some of the lubricating oil from continuing to flow toward compressor 300 casing 2, causing it to flow back along the inner wall of windings 32 or rebound back into the flow holes of rotor 1, where it is then lifted by the gas subsequently discharged from the flow holes and discharged from compressor 300 along with the high-pressure gas, entering the condenser and evaporator.

[0046] It can be understood that the height of the main body 10 can be appropriately designed according to the protruding height 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. Preferably, the lubricating oil can completely pass over the winding 32.

[0047] Because the oil-gas mixture has an upward velocity and a radial velocity along the balancing block 100 when it is ejected from the second flow hole b, the oil-gas mixture is synthesized into a velocity inclined outward and upward. Therefore, the minimum thickness of the balancing block 100 is set to be greater than or equal to 1 / 4L to ensure that the lubricating oil can pass over the top of the stator winding 32 when it is centrifugally thrown out.

[0048] In the technical solution of the present invention, a balancing block 100 is installed on the top of the rotor 1. The center of gravity of the balancing block 100 is set away from its geometric center, which can balance the centrifugal force in the radial direction of the crankshaft by the rolling piston and gas force during operation. The balancing 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 circumference 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 surfaces 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 balancing 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 balancing block 100. Since the height of the lubricating oil is higher, it can pass over the top of the winding 32 on the outer stator and return to the oil normally along the cut edge of the stator and the inner wall of the shell 2 in time, avoiding the thrown 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 subsequently discharged from the flow hole, so as to solve the problem in the existing compressor 300 that the lubricating oil cannot flow back in time and is easily discharged with the high-pressure gas.

[0049] Furthermore, in this embodiment, t≤L. Setting the minimum thickness of the balancing weight 100 to be less than L, on the one hand, can balance the centrifugal force and take into account the cost. On the other hand, if the balancing weight 100 is set too high, the space above the rotor 1 in the compressor 300 is small, making it difficult to separate the oil-gas mixture. The oil is too close to the air outlet at the top of the compressor 300, so that the lubricating oil is not fully separated and is easily discharged directly. It cannot flow back to the bottom along the inner wall of the shell 2 to form a cycle and easily enters the condenser and evaporator.

[0050] Furthermore, in another embodiment, the second end surface 102 of the main body 10 has a guide slope disposed on a side of the second through-hole b away from the center hole. The guide slope is arranged in an outward direction from the middle portion of the main body 10, away from the first end surface 101. With this arrangement, when the lubricating oil is ejected from the second through-hole b, the lubricating oil flows upward along the guide slope. Even after the lubricating oil leaves the second end surface 102 of the main body 10, it can continue to flow obliquely upward due to inertia. In this way, the main body 10 can be made thinner, and the lubricating oil can still pass over the top of the winding 32.

[0051] Furthermore, in this embodiment, the guide slope is annular and arranged around the periphery of the second flow hole b. This ensures that the lubricating oil, regardless of the direction from which it is ejected, flows obliquely upward along the annular guide slope, ensuring that the lubricating oil, when exiting the second flow hole b in any direction, can pass over the winding 32 on the stator.

[0052] It is also necessary to note that, please refer to Figure 1 In the related art, in order to balance the centrifugal force in the radial direction of the crankshaft, the balancing weight 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 surface of the rotor. Because the bottom of the crankshaft extends into the oil pool at the bottom of the compressor casing, a hollow oil transfer channel is provided in the middle of the crankshaft. Because the pressure below the rotor is higher than the pressure above, and the balancing weight 100' disturbs the low-pressure area formed by the flow field, the lubricating oil in the oil pool will move upward through the oil hole inside the crankshaft under the action of the pressure difference, which also affects the stability of the oil pool.

[0053] In one embodiment, the main body 10 is provided with a counterweight hollow portion. By providing the counterweight hollow portion within the main body 10, the mass on the side of the counterweight hollow portion is reduced, thereby shifting the center of gravity of the balancing weight 100. The balancing weight 100 does not disturb the flow field, thus preventing the formation of a low-pressure area above the top. This prevents an increase in the pressure difference between the top and bottom of the rotor 1, and prevents excessive lubricating oil in the oil pool from being transferred to the oil delivery channel.

[0054] Specifically, in this embodiment, the second through-hole b forms the counterweight hollow portion. Because the second through-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 through-hole is located, causing the center of gravity to shift toward the other side, which is symmetrical with the second through-hole b about the central through-hole a.

[0055] In one embodiment, a plurality of second through-flow holes b are provided, spaced apart along the circumference of the main body 10, and at least some of the second through-flow holes b have different cross-sectional sizes. Thus, among the plurality of second through-flow holes b symmetrically arranged about the central through-hole a, the cross-sectional sizes of the second through-flow holes b on one side can be larger. This shifts the center of gravity of the balancing weight 100 to the side with the smaller cross-sectional sizes of the second through-flow holes b.

[0056] The cross-section of each of the through-flow holes can be set to a circular, polygonal, or irregular shape. The cross-section of each of the plurality of second through-flow holes b can be set to the same shape. Of course, the cross-sections of some of the second through-flow holes b can be set to the same shape, and the cross-sections of other part of the second through-flow holes b can be set to another shape, so that the center of gravity of the balancing weight 100 deviates from its geometric center.

[0057] In another embodiment, a plurality of second through-flow holes b are provided, and these second through-flow holes b are unevenly distributed around the circumference of the main body 10, so that the center of gravity of the balancing weight 100 is offset from its geometric center. Providing a larger number of second through-flow holes b on one side of the main body 10 that is symmetrical about its center can reduce the weight of that side, while a side with fewer second through-flow holes b is heavier. By adjusting the distribution density of the second through-flow holes b, the center offset of the balancing weight 100 can be flexibly adjusted.

[0058] In yet another embodiment, see Figure 5 The balancing block 100 further includes a counterweight protrusion 11 protruding from the second end surface 102 of the main body 10. The counterweight protrusion 11 is arranged away from the center of the main body 10. The main body 10 is provided with the second flow hole b.

[0059] In this way, it is convenient to process the second flow hole b. In particular, when there are multiple second flow holes b, the number, shape and size of the multiple flow holes can be set to be equivalent to the number, shape and size of the multiple first flow holes d on the rotor 1. The center of gravity of the balancing block 100 is offset only by balancing the weight through the counterweight protrusion 11.

[0060] Specifically, in this embodiment, the volume of the second through-hole b is V1, the volume of the balancing block 100 is V, and V1≤1 / 3V.

[0061] It should be noted that the volume of the balancing block 100 refers to the space occupied by the outer shape of the balancing block 100. When hollow structures such as holes and grooves are provided inside the balancing block 100, the volume of the balancing block 100 includes the volume occupied by the hollow structures such as holes and grooves.

[0062] The volume of the second through-hole b is set to be less than or equal to 1 / 3 times the volume of the balancing block 100 to avoid setting the second through-hole b too large, which would reduce the mass of the balancing block 100 itself too much and make it difficult to achieve the purpose of significantly adjusting the center of gravity of the balancing block 100.

[0063] Further, see Figure 4 and Figure 5To facilitate securing the balancing weight 100 to the rotor 1, the balancing weight 100 is further provided with second connection holes c that penetrate through both end surfaces of the balancing weight 100 and correspond to the first connection holes f on the rotor 1. The balancing weight 100 is connected via a connector that penetrates the first connection holes f and the second connection holes c.

[0064] The balancing weight 100 and the rotor 1 can be fixed by bolt connection or riveting. Of course, other possible connection methods can also be used. The specific method can be determined according to actual conditions and is not limited in this embodiment of the present specification.

[0065] In this embodiment, the cross-sectional area of ​​the second through-hole b is set to be equal to or greater than the cross-sectional area of ​​the first through-hole d. This prevents the oil-gas mixture flowing through the first through-hole d from interfering with the bottom wall of the balancing block 100 during its ascent, and allows the oil-gas mixture in the first through-hole d to flow smoothly into the second through-hole b.

[0066] 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.

[0067] In this way, the oil-gas mixture is prevented from interfering with the bottom wall of the balance block 100 during its rising process from the shaft hole e, so that the oil-gas mixture in the shaft hole e can smoothly flow into the central through hole a.

[0068] 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 a "carbon dioxide transcritical cycle" and has no destructive effect on the ozone layer. In some application scenarios, the carbon dioxide system can achieve higher energy efficiency than traditional refrigeration systems.

[0069] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A compressor, characterized in that: include: case; A drive motor is disposed in the housing and includes a rotor and a stator assembly disposed on the periphery of the rotor, wherein the rotor is provided with a first flow hole, and the stator assembly includes a stator core and a winding wound around the periphery of the stator core; as well as, A balancing weight, the balancing weight comprising a main body having a first end surface and a second end surface arranged opposite to each other, the first end surface being mounted on the upper end of the rotor, the main body being provided with a central through hole for passing the crankshaft, and a second through hole located around the central through hole and communicating with the first through hole, the second through hole being provided through both end surfaces of the main body; The distance between the top of the winding and the top of the stator core is L, the minimum thickness of the balancing block is t, and t≥1 / 4*L.

2. The compressor according to claim 1, wherein t≤L.

3. The compressor according to claim 1, wherein The main body is provided with a counterweight hollow portion.

4. The compressor according to claim 3, wherein The second through-hole forms the counterweight hollow portion.

5. The compressor according to claim 4, wherein A plurality of the second through-flow holes are provided, and the plurality of the second through-flow holes are spaced apart along the circumference of the main body, and cross-sectional sizes of at least some of the second through-flow holes are different.

6. The compressor according to claim 4, wherein A plurality of the second through-flow holes are provided, and the plurality of second through-flow holes are unevenly distributed in the circumferential direction of the main body, so that the center of gravity of the balancing weight is deviated from its geometric center.

7. The compressor according to any one of claims 1 to 6, characterized in that The balancing weight further includes a counterweight protrusion protruding from the second end surface of the main body, and the counterweight protrusion is arranged offset from the center of the main body.

8. The compressor according to claim 1, wherein The volume of the second through-hole is V1, the volume of the balancing block is V, and V1≤1 / 3V.

9. The compressor according to claim 1, wherein The balancing block is further provided with a second connecting hole which passes through the two end surfaces of the balancing block and is corresponding to the first connecting hole on the rotor.

10. The compressor according to claim 1, wherein The cross-sectional area of ​​the second through-flow hole is set to be greater than or equal to the cross-sectional area of ​​the first through-flow hole.

11. The compressor according to claim 1, 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 according to claim 1, wherein The second end surface of the main body has a guide slope arranged on a side of the second through hole away from the central through hole, and the guide slope is arranged to be inclined away from the first end surface in a direction outward from the middle of the main body.

13. The compressor according to claim 12, wherein The guide slope is arranged in a ring shape and is arranged around the periphery of the second through-hole.

14. The compressor according to claim 1, wherein The compressor comprises a carbon dioxide compressor.

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