CN116181781A - Crankshaft assembly, pump body assembly and assembly method of pump body assembly - Google Patents

Abstract

The application relates to the technical field of refrigeration equipment and discloses a crankshaft assembly, which comprises a crankshaft, a first crankshaft balancing part, an eccentric part and a second crankshaft balancing part. The crankshaft comprises a first shaft section, an eccentric section and a second shaft section which are connected in sequence. The first crankshaft balance part is arranged on the first shaft section. The eccentric part is arranged on the eccentric section. The second crankshaft balance part is arranged on the second shaft section. Wherein, first bent axle balancing part, eccentric part and second bent axle balancing part set up along the axial interval of bent axle. The first crankshaft balance part and the second crankshaft balance part are respectively arranged on the upper side and the lower side of the eccentric part and are respectively positioned on the two sides of the central axis of the crankshaft with the eccentric part, so that the first crankshaft balance part and the second crankshaft balance part can be used for balancing unbalanced force and moment generated by the eccentric part and the piston, vibration of the crankshaft is reduced, and energy efficiency of the compressor is improved. The application also discloses a pump body assembly and an assembly method of the pump body assembly.

Description

Crankshaft assembly, pump body assembly and assembly method of pump body assembly

Technical Field

The application relates to the technical field of refrigeration equipment, for example, to a crankshaft assembly, a pump body assembly and an assembly method of the pump body assembly.

Background

At present, in the existing rolling rotor compressor, a motor rotor, an upper bearing, a cylinder and a lower bearing are sequentially arranged on a crankshaft in a penetrating manner, wherein an eccentric part is arranged on the crankshaft. Because of the eccentric part, the eccentric part and the piston sleeved outside the eccentric part have larger centrifugal force during rotation in the process of rotating the crankshaft, and the crankshaft can generate obvious vibration to influence the energy efficiency of the compressor. In the related art, weights are respectively arranged at the upper end and the lower end of a motor rotor to balance unbalanced force and moment, so that vibration of a compressor is reduced.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

under high rotation speed, the crankshaft generates bending deflection under the action of centrifugal force and bending moment generated by the balance weight on the motor rotor, and the vibration of the crankshaft is aggravated.

It should be noted that the information disclosed in the foregoing background section is only for enhancing understanding of the background of the present application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides a crankshaft assembly, a pump body assembly and an assembly method of the pump body assembly, so as to solve the problem that the existing crankshaft generates bending deflection under the action of centrifugal force and bending moment generated by a balancing block on a motor rotor at a high rotating speed, and the vibration of the crankshaft is aggravated.

In some embodiments, a crankshaft assembly includes a crankshaft, a first crankshaft balance, an eccentric portion, and a second crankshaft balance. The crankshaft comprises a first shaft section, an eccentric section and a second shaft section which are connected in sequence. The first crankshaft balance part is arranged on the first shaft section. The eccentric part is arranged on the eccentric section. The second crankshaft balance part is arranged on the second shaft section. The first crankshaft balance part, the eccentric part and the second crankshaft balance part are arranged at intervals along the axial direction of the crankshaft, and the first crankshaft balance part axially corresponds to the second crankshaft balance part and is respectively positioned at two sides of the central axis of the crankshaft with the eccentric part.

Optionally, a first preset distance d1 is provided between the first crankshaft balancing portion and the eccentric portion. A second preset distance d2 is arranged between the second crankshaft balance part and the eccentric part, wherein d1/d2 is more than or equal to 0.2 and less than or equal to 5.

Optionally, the first crankshaft balance is detachably connected to the crankshaft. And/or the second crankshaft balance part is detachably connected to the crankshaft.

Optionally, the crankshaft assembly further comprises a piston. The piston sleeve is arranged on the outer side of the eccentric part, and the piston comprises a plurality of arc-shaped sections which are detachably connected.

In some embodiments, the pump body assembly includes the crankshaft assembly described above.

Optionally, the pump body assembly further comprises a motor rotor, a cylinder, a first balancing cylinder, a first bearing, a second balancing cylinder, and a second bearing. The motor rotor is arranged on the crankshaft and is positioned on the first shaft section. The cylinder is used for limiting a compression cavity, the eccentric part is positioned in the compression cavity, and the compression cavity provides a rotation space for the eccentric part. The first balance cylinder is used for limiting a first balance cavity, the first crankshaft balance part is positioned in the first balance cavity, the first balance cavity provides a rotation space for the first crankshaft balance part, and the first end of the first balance cylinder is connected with the first end of the cylinder. And the first bearing is connected with the second end of the first balance cylinder. And the second balance cylinder is used for limiting a second balance cavity, the second crankshaft balance part is positioned in the second balance cavity, the first balance cavity provides a rotation space for the first crankshaft balance part, and the first end of the second balance cylinder is connected with the second end of the cylinder. And the second bearing is connected with the second end of the second balance cylinder. The crankshaft sequentially penetrates through the first bearing, the first balance cylinder, the air cylinder, the second balance cylinder and the second bearing.

Optionally, the first crankshaft balance is h1 in height. The height of the first balance cavity is H1, wherein H1-H1 is less than or equal to 1mm and less than or equal to 6mm.

Optionally, the second crankshaft balance is h2 in height. The height of the second balance cavity is H2, wherein H2-H2 which is more than or equal to 1mm is less than or equal to 6mm.

Optionally, the first balance cylinder is provided with a plurality of pretension screw holes, and the first bearing is provided with a plurality of pretension through holes correspondingly for pretension fixation of the first balance cylinder and the first bearing through the first threaded connection piece. The first balance cylinder is provided with a plurality of fixed screw holes, and the cylinder, the second balance cylinder and the second bearing are all provided with a plurality of fixed through holes correspondingly for fixed with the first balance cylinder through second threaded connection spare with cylinder, second balance cylinder and second bearing. Wherein the length of the second threaded connection is greater than the length of the first threaded connection.

In some embodiments, the method of assembling the pump body assembly includes the steps of:

penetrating a first bearing into a first shaft section of a crankshaft, penetrating a first balance cylinder into the first shaft section of the crankshaft, and pre-fastening and shaping the first bearing and the first balance cylinder into a first assembly;

the cylinder penetrates through an eccentric section of the crankshaft, and then the first assembly and the cylinder are subjected to core adjustment assembly to form a second assembly;

penetrating a second balance cylinder into a second shaft section of the crankshaft, and pre-fastening and shaping the second balance cylinder and a second assembly into a third assembly;

and the second bearing is penetrated into the second shaft section of the crankshaft, and then the second bearing, the second balance cylinder and the air cylinder are fixed on the first balance cylinder, so that the assembly of the pump body assembly is completed.

The crankshaft assembly, the pump body assembly and the assembly method of the pump body assembly provided by the embodiment of the disclosure can realize the following technical effects:

the crankshaft assembly provided by the embodiment of the disclosure comprises a crankshaft, a first crankshaft balance part, an eccentric part and a second crankshaft balance part. The first crankshaft balance part is arranged on the first shaft section. The eccentric part is arranged on the eccentric section. The second crankshaft balance part is arranged on the second shaft section. The first crankshaft balance part, the eccentric part and the second crankshaft balance part are arranged at intervals along the axial direction of the crankshaft, and the first crankshaft balance part axially corresponds to the second crankshaft balance part and is respectively positioned at two sides of the central axis of the crankshaft with the eccentric part. The first crankshaft balance part and the second crankshaft balance part are respectively arranged on the upper side and the lower side of the eccentric part, and the first crankshaft balance part and the second crankshaft balance part are respectively positioned on the two sides of the central axis of the crankshaft, so that the first crankshaft balance part and the second crankshaft balance part can be used for balancing unbalanced force and moment generated by the eccentric part and the piston, thereby reducing vibration of the crankshaft and improving energy efficiency of the compressor.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

FIG. 1 is a schematic view of a part of a pump body assembly according to the related art;

FIG. 2 is a schematic illustration of a pump body assembly provided in accordance with an embodiment of the present disclosure;

FIG. 3 is an exploded schematic view of a pump body assembly provided by an embodiment of the present disclosure;

FIG. 4 is a schematic cross-sectional view of a pump body assembly provided by an embodiment of the present disclosure;

FIG. 5 is a schematic view of a portion of another pump body assembly provided by an embodiment of the present disclosure;

FIG. 6 is a graph of vibration modes of a pump body assembly provided by an embodiment of the present disclosure;

FIG. 7 is a schematic illustration of a crankshaft assembly provided in accordance with an embodiment of the present disclosure;

FIG. 8 is a schematic illustration of a piston provided in an embodiment of the present disclosure;

FIG. 9 is a schematic structural view of a first balancing cylinder provided by an embodiment of the present disclosure;

FIG. 10 is a schematic cross-sectional view of a first balancing cylinder provided by an embodiment of the present disclosure;

FIG. 11 is a schematic structural view of a second balancing cylinder provided by an embodiment of the present disclosure;

FIG. 12 is a schematic cross-sectional view of a second balance cylinder provided by an embodiment of the present disclosure;

fig. 13 is a flowchart of a method of assembling a pump body assembly according to an embodiment of the present disclosure.

Reference numerals:

10': a crankshaft; 14': a piston; 121': a eccentric portion;

60': a second bearing;

70': a motor rotor; 71': a first rotor balancing part; 72': a second rotor balancing part;

10: a crankshaft; 11: a first shaft section; 111: a first crankshaft balancing part; 12: an eccentric section; 121: a eccentric portion; 13: a second shaft section; 131: a second crankshaft balancing part; 14: a piston; 141: a first arcuate segment; 142: a second arcuate segment;

20: a cylinder; 30: a first balancing cylinder; 31: a first balance chamber; 32: pre-tightening the threaded hole; 33: fixing the threaded holes; 40: a second balance cylinder; 41: a second balance chamber; 42: a fixing through hole;

50: a first bearing; 60: a second bearing;

70: a motor rotor;

80: a first threaded connection; 90: a second threaded connection;

d1: a first preset distance; d2: a second preset distance;

h1: the height of the first crankshaft balance part; h2: the height of the second crankshaft balance part;

h1: the height of the first balancing cavity; h2: the height of the second balance chamber.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe embodiments of the present disclosure and embodiments thereof and are not intended to limit the indicated device, element, or component to a particular orientation or to be constructed and operated in a particular orientation. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the embodiments of the present disclosure will be understood by those of ordinary skill in the art in view of the specific circumstances.

In addition, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the embodiments of the present disclosure may be understood by those of ordinary skill in the art according to specific circumstances.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other.

In the conventional rolling rotor compressor, since the eccentric portion 121 'is provided, the eccentric portion 121' and the piston 14 'sleeved on the outer side of the eccentric portion 121' have a large centrifugal force during rotation of the crankshaft 10', and the crankshaft 10' generates significant vibration, which affects the energy efficiency of the compressor. In the related art, weights are disposed at the upper and lower ends of the motor rotor 70' to balance unbalanced forces and moments, respectively, as shown in fig. 1. In fig. 1, a first rotor balancing part 71 'and a second rotor balancing part 72' are respectively provided at upper and lower ends of a motor rotor 70', and the first rotor balancing part 71' and the second rotor balancing part 72 'are respectively located at both sides of a center line of a crankshaft 10'. Unbalanced force F2 'and moment L2' are generated from the eccentric portion 121 'shown in fig. 1, and unbalanced force F4' and moment L4 'are generated from the piston 14, so that the first and second rotor balancing portions 71' and 72 'on the motor rotor 70' respectively require balanced force F1 'and moment L1' and balanced force F3 'and moment L3' to balance unbalanced force F2 'and moment L2' and unbalanced force F4 'and moment L4'. It can be seen that the moments L1 'and L3' of the first rotor balance portion 71 'and the second rotor balance portion 72' are relatively long, and it is not easy to perform dynamic balance adjustment on the pump body. At high rotational speeds, the crankshaft 10' generates bending deflection under the centrifugal force and bending moment generated by the balancing part on the motor rotor 70', which instead aggravates vibration of the crankshaft 10' and reduces energy efficiency of the compressor.

The disclosed embodiments provide a crankshaft assembly, a pump body assembly and an assembly method of the pump body assembly, so as to solve the problem that the existing crankshaft 10 generates bending deflection under the action of centrifugal force and bending moment generated by a balancing block on a motor rotor 70 at a high rotation speed, and the vibration of the crankshaft 10 is aggravated.

The embodiment of the present disclosure shown in connection with fig. 2 and 7 provides a crankshaft assembly including a crankshaft 10, a first crankshaft balance portion 111, an eccentric portion 121, and a second crankshaft balance portion 131. The crankshaft 10 includes a first shaft section 11, an eccentric section 12, and a second shaft section 13, which are connected in sequence. The first crankshaft balance 111 is provided in the first shaft section 11. The eccentric portion 121 is provided to the eccentric section 12. The second crankshaft balance portion 131 is provided in the second shaft section 13. The first crankshaft balance portion 111, the eccentric portion 121, and the second crankshaft balance portion 131 are disposed at intervals along the axial direction of the crankshaft 10, and the first crankshaft balance portion 111 axially corresponds to the second crankshaft balance portion 131 and is located on both sides of the central axis of the crankshaft 10 with respect to the eccentric portion 121.

By adopting the crankshaft assembly provided by the embodiment of the disclosure, the vibration of the crankshaft 10 can be reduced, and the energy efficiency of the compressor can be improved. The crankshaft assembly provided by the embodiment of the present disclosure includes a crankshaft 10, a first crankshaft balance portion 111, an eccentric portion 121, and a second crankshaft balance portion 131. The crankshaft 10 includes a first shaft section 11, an eccentric section 12, and a second shaft section 13, which are connected in sequence. The first crankshaft balancing portion 111 is provided to the first shaft section 11, that is, one end of the eccentric section 12 is connected to one end of the first shaft section 11, and the other end of the eccentric section 12 is connected to the other end of the second shaft section 13. The first crankshaft balance 111 is provided in the first shaft section 11. The eccentric portion 121 is provided to the eccentric section 12. The second crankshaft balance portion 131 is provided in the second shaft section 13. Namely, the first crankshaft balance portion 111 and the second crankshaft balance portion 131 are located on the upper and lower sides of the eccentric portion 121, respectively. Wherein the first crankshaft balance portion 111, the eccentric portion 121, and the second crankshaft balance portion 131 are disposed at intervals along the axial direction of the crankshaft 10, that is, the first crankshaft balance portion 111, the eccentric portion 121, and the second crankshaft balance portion 131 are disposed with a certain interval therebetween along the axial direction of the crankshaft 10. The first crankshaft balance portion 111 axially corresponds to the second crankshaft balance portion 131, and is located on both sides of the center axis of the crankshaft 10 with respect to the eccentric portion 121. By disposing the first and second crankshaft balance parts 111 and 131 on the upper and lower sides of the eccentric part 121, respectively, and disposing the first and second crankshaft balance parts 111 and 131 and the eccentric part 121 on the both sides of the central axis of the crankshaft 10, respectively, the first and second crankshaft balance parts 111 and 131 can be used to balance unbalanced forces and moments generated by the eccentric part 121 and the piston 14, thereby reducing vibration of the crankshaft 10 and improving energy efficiency of the compressor.

Alternatively, a first preset distance d1 is provided between the first crankshaft balance portion 111 and the eccentric portion 121. A second preset distance d2 is provided between the second crankshaft balancing portion 131 and the eccentric portion 121, wherein d1/d2 is greater than or equal to 0.2 and less than or equal to 5.

By reasonably setting the setting positions of the first crankshaft balance portion 111 and the second crankshaft balance portion 131 on the crankshaft 10, that is, a first preset distance d1 is set between the first crankshaft balance portion 111 and the eccentric portion 121, and a second preset distance d2 is set between the second crankshaft balance portion 131 and the eccentric portion 121, and 0.2 is equal to or less than d1/d2 is equal to or less than 5, as shown in fig. 7. In this range, it is ensured that the first and second crankshaft balance parts 111 and 131 can effectively balance unbalanced forces and moments generated from the eccentric part 121 and the piston 14, thereby reducing vibration of the crankshaft 10 and improving energy efficiency of the compressor.

Specifically, the ratio d1/d2 of the first preset distance d1 between the first crankshaft balance portion 111 and the eccentric portion 121 to the second preset distance d2 between the second crankshaft balance portion 131 and the eccentric portion 121 may be 0.2, 0.6, 1, 3, 5. The structures of the first and second crankshaft balance portions 111 and 131 are not limited herein, and each of the first and second crankshaft balance portions 111 and 131 may have a circular, sector, oval, rectangular, or irregular shape. The weights of the first crankshaft balance portion 111 and the second crankshaft balance portion 131 are not limited, and the weights of the first crankshaft balance portion 111 and the second crankshaft balance portion 131 may be the same or different. Illustratively, when the weights of the first crankshaft balance portion 111 and the second crankshaft balance portion 131 are the same, the ratio d1/d2 of the first preset distance d1 between the first crankshaft balance portion 111 and the eccentric portion 121 to the second preset distance d2 between the second crankshaft balance portion 131 and the eccentric portion 121 is 1, so that the first crankshaft balance portion 111 and the second crankshaft balance portion 131 have a better balance effect on unbalanced forces and moments generated by the eccentric portion 121 and the piston 14.

Alternatively, the first crankshaft balance portion 111 is detachably connected to the crankshaft 10. And/or the second crankshaft balance portion 131 is detachably coupled to the crankshaft 10.

The first crankshaft balance portion 111 is detachably connected with the crankshaft 10, so that the first crankshaft balance portion 111 can be fixed in a clamping and positioning manner, and is easy to assemble. Thus, the required dynamic balance weight can be realized by selecting the first crankshaft balance parts 111 with different sizes, and the dynamic balance is easier to ensure. Also, when the first crankshaft balance portion 111 is damaged, it is more convenient to replace it with a new one or repair it. The second crankshaft balance portion 131 is detachably connected with the crankshaft 10, so that the second crankshaft balance portion 131 can be fixed in a clamping and positioning manner, and assembly is easy. Thus, the required dynamic balance weight can be realized by selecting the second crankshaft balance parts 131 with different sizes, and the dynamic balance is easier to ensure. Also, when the second crankshaft balance portion 131 is damaged, it is more convenient to replace it with a new one or repair it.

Specifically, the first crankshaft balancing portion 111 is detachably connected to the crankshaft 10, and the second crankshaft balancing portion 131 is integrally formed with the crankshaft 10. Alternatively, the second crankshaft balance portion 131 may be detachably connected to the crankshaft 10, and the first crankshaft balance portion 111 may be integrally formed with the crankshaft 10. Alternatively, the first crankshaft balance portion 111 and the second crankshaft balance portion 131 are both detachably connected to the crankshaft 10. All three schemes can lead the first crankshaft balance part 111 and the second crankshaft balance part 131 to have better balance effect on unbalanced force and moment generated by the eccentric part 121 and the piston 14, thereby reducing the vibration of the crankshaft 10.

Illustratively, when the first crankshaft balance portion 111 and the second crankshaft balance portion 131 are both detachably connected to the crankshaft 10, the first crankshaft balance portion 111 and the second crankshaft balance portion 131 are manufactured for two independent parts, and the machining difficulty of the first crankshaft balance portion 111 and the second crankshaft balance portion 131 can be reduced without punching a dynamic balance hole. Meanwhile, the first crankshaft balance part 111 and the second crankshaft balance part 131 with different sizes are selected to realize the required dynamic balance weight, so that the dynamic balance is easier to ensure.

Optionally, the crankshaft assembly further comprises a piston 14. The piston 14 is sleeved on the outer side of the eccentric part 121, and the piston 14 comprises a plurality of arc-shaped sections which are detachably connected.

So configured, the crankshaft assembly further includes a piston 14, the piston 14 being disposed outside of the eccentric portion 121. Wherein the piston 14 is formed by enclosing a plurality of arc-shaped sections which are detachably connected. The arc segments can thus be connected in sequence around the eccentric 121 at the eccentric 121, splicing the annular piston 14 provided in its entirety at the eccentric 121. The occurrence of the failure of normal assembly due to the inability of the piston 14 to pass through the first crankshaft balance portion 111 or the second crankshaft balance portion 131 can be avoided when the crankshaft assembly is installed, which also facilitates the installation of the piston 14.

Specifically, the piston 14 may have 2 arcuate segments circumscribing. As shown in connection with fig. 8, the piston 14 includes a first arcuate segment 141 and a second arcuate segment 142. The first arc-shaped section 141 and the second arc-shaped section 142 may adopt a connection mode of phase clamping.

As shown in connection with fig. 2-4, the disclosed embodiments provide a pump body assembly including the above-described crankshaft assembly, motor rotor 70, cylinder 20, first balance cylinder, first bearing 50, second balance cylinder, and second bearing 60. The motor rotor 70 is arranged on the crankshaft 10, and the motor rotor 70 is located on the first shaft section 11. The cylinder 20 defines a compression chamber in which the eccentric portion 121 is located, and the compression chamber provides a rotation space for the eccentric portion 121. The first balance cylinder 30 defines a first balance chamber 31, the first crankshaft balance portion 111 is located in the first balance chamber 31, the first balance chamber 31 provides a rotational space for the first crankshaft balance portion 111, and a first end of the first balance cylinder 30 is connected to a first end of the cylinder 20. The first bearing 50 is connected to the second end of the first balancing cylinder 30. The second balance cylinder 40 defines a second balance chamber 41, the second crankshaft balance portion 131 is located within the second balance chamber 41, the first balance chamber 31 provides a rotational space for the first crankshaft balance portion 111, and a first end of the second balance cylinder 40 is connected to a second end of the cylinder 20. The second bearing 60 is connected to a second end of the second balance cylinder 40. Wherein the crankshaft 10 sequentially penetrates the first bearing 50, the first balance cylinder 30, the cylinder 20, the second balance cylinder 40, and the second bearing 60.

The embodiment of the present disclosure provides a pump body assembly that adopts the above-described crankshaft assembly, and can effectively utilize unbalanced forces and moments generated by the eccentric portion 121 and the piston 14 by the first crankshaft balance portion 111 and the second crankshaft balance portion 131, thereby reducing vibration of the crankshaft 10. The crankshaft 10 in the pump body assembly sequentially penetrates through the first bearing 50, the first balance cylinder 30, the cylinder 20, the second balance cylinder 40 and the second bearing 60 to form the pump body assembly. Wherein the eccentric portion 121 is located in a compression chamber defined by the cylinder 20, the compression chamber providing a rotation space for the eccentric portion 121. The first balancing cylinder 30 is located at an upper portion of the cylinder 20 and is connected to an upper end surface of the cylinder 20. The first crankshaft balance 111 is located within a first balance chamber 31 defined by the first balance cylinder 30, the first balance chamber 31 providing a rotational space for the first crankshaft balance 111. The first bearing 50 is located at an upper portion of the first balancing cylinder 30 and is connected to an upper end surface of the first balancing cylinder 30. The second balance cylinder 40 is located at a lower portion of the cylinder 20 and is connected to a lower end surface of the cylinder 20. The second crankshaft balance 131 is located within a second balance chamber 41 defined by the second balance cylinder 40, the second balance chamber 41 providing a rotational space for the second crankshaft balance 131. The second bearing 60 is located at the lower portion of the second balance cylinder 40 and is connected to the lower end surface of the second balance cylinder 40. In this way, the first and second crankshaft balance parts 111 and 131 rotate in the first and second balance cylinders 30 and 40, respectively, without being affected by the air flow in the compressor, thereby reducing vibration of the crankshaft 10 and improving energy efficiency of the compressor.

As shown in fig. 5, a first crankshaft balance portion 111 and a second crankshaft balance portion 131 are provided on the first shaft section 11 and the second shaft section 13 of the crankshaft 10, respectively, that is, the first crankshaft balance portion 111 and the second crankshaft balance portion 131 are located on the upper and lower sides of the eccentric portion 121, respectively, and are located on the two sides of the center line of the crankshaft 10 with the eccentric portion 121, respectively. Unbalanced force F2 and moment L2 are generated from the eccentric portion 121 shown in fig. 4, and unbalanced force F4 and moment L4 are generated from the piston 14, so that the first and second crankshaft balance portions 111 and 131 on the crankshaft 10 require balanced force F3 and moment L3 and balanced force F1 and moment L1 to balance unbalanced force F2 and moment L2 and unbalanced force F4 and moment L4, respectively. It can be seen that the moments L3 and L1 of the first crankshaft balance portion 111 and the second crankshaft balance portion 131 are relatively short, and dynamic balance adjustment of the pump body is easier. And the crankshaft 10 is not easy to deform after long-time operation, thereby reducing the vibration of the crankshaft 10 and improving the energy efficiency of the compressor.

Referring to fig. 6, a solid curve is a vibration mode curve of a pump body assembly according to an embodiment of the disclosure, and a dotted curve is a vibration mode curve of a pump body assembly according to a related art. As can be seen from the figures, the vibration acceleration of the pump body assembly of the embodiments of the present disclosure is significantly reduced, that is, it is shown that the vibration of the crankshaft 10 in the pump body assembly is significantly reduced.

Alternatively, the first crankshaft balance portion 111 has a height h1. The height of the first balance chamber 31 is H1, wherein H1-H1 is 1mm or less and 6mm or less.

As shown in fig. 9 and 10, the height of the first crankshaft balance portion 111 is set to H1, and the height of the first balance chamber 31 is set to H1, which makes 1mm < H1-H1 < 6mm, so that the first balance chamber 31 can provide sufficient rotation space for the first crankshaft balance portion 111, preventing the first crankshaft balance portion 111 from interfering too close to the wall surface of the first balance chamber 31, thereby affecting the balance effect of the first crankshaft balance portion 111. The shape of the first balance chamber 31 is not limited here, and may be circular or elliptical.

Alternatively, the second crankshaft balance portion 131 has a height h2. The height of the second balance chamber 41 is H2, wherein H2-H2 is 1mm or less and 6mm or less.

As shown in conjunction with fig. 11 and 12, the height of the second crankshaft balance portion 131 is set to H1, and the height of the second balance chamber 41 is set to H1, wherein 1mm is equal to or less than H1-H1 is equal to or less than 6mm, so that the second balance chamber 41 can provide sufficient rotation space for the second crankshaft balance portion 131, and interference is prevented from being formed by the second crankshaft balance portion 131 being too close to the wall surface of the second balance chamber 41, thereby affecting the balance effect of the second crankshaft balance portion 131. The shape of the second balance chamber 41 is not limited here, and may be circular or elliptical.

Further, when the height H1 of the first crankshaft balance portion 111 is equal to the height H2 of the second crankshaft balance portion 131, the height H1 of the first balance chamber 31 may be the same as or different from the height H2 of the second balance chamber 41.

Alternatively, the first balance cylinder 30 is provided with a plurality of pre-tightening screw holes 32, and the first bearing 50 is correspondingly provided with a plurality of pre-tightening through holes for pre-tightening and fixing the first balance cylinder 30 and the first bearing 50 through the first screw connection 80. The first balancing cylinder 30 is provided with a plurality of fixing screw holes 33, and the cylinder 20, the second balancing cylinder 40, and the second bearing 60 are each provided with a plurality of fixing through holes 42 for fixing the cylinder 20, the second balancing cylinder 40, and the second bearing 60 with the first balancing cylinder 30 through the second screw connection 90. Wherein the length of the second threaded connection 90 is greater than the length of the first threaded connection 80.

The first balance cylinder 30 is provided with a plurality of pre-tightening threaded holes 32, the first bearing 50 is correspondingly provided with a plurality of pre-tightening through holes, and the first balance cylinder 30 and the first bearing 50 are pre-tightened and fixed through the first threaded connecting piece 80, so that the first balance cylinder 30 and the first bearing 50 can be more conveniently cored with the cylinder 20. Specifically, the first balance cylinder 30 and the first bearing 50 are provided with two pre-tightening screw holes 32 and two pre-tightening through holes, respectively. And the two pre-tightening screw holes 32 are respectively provided at the central symmetrical positions of the first balance cylinder 30, and the two pre-tightening through holes are respectively provided at the central symmetrical positions of the first bearing 50.

The first balance cylinder 30 is provided with a plurality of fixing screw holes 33, and the cylinder 20, the second balance cylinder 40, and the second bearing 60 are each provided with a plurality of fixing through holes 42, so that the cylinder 20, the second balance cylinder 40, and the second bearing 60 are fixed with the first balance cylinder 30 by the second screw connection 90. Because the fixing through holes 42 without threads are arranged on the air cylinder 20, the second balance cylinder 40 and the second bearing 60, no thread stress is needed in the fixing with the first air cylinder 20, the deformation of the air cylinder 20 can be reduced, and the energy efficiency of the compressor is improved.

In some embodiments, the compressor includes a pump body assembly as described above.

Referring to fig. 13, an embodiment of the disclosure provides a method for assembling a pump body assembly, including the steps of:

s10, penetrating the first bearing 50 into the first shaft section 11 of the crankshaft 10, penetrating the first balance cylinder 30 into the first shaft section of the crankshaft 10, and pre-fastening and shaping the first bearing 50 and the first balance cylinder 30 into a first assembly.

In this step S10, the manner of pre-fastening the first bearing 50 and the first balance cylinder 30 is not limited. Alternatively, in the case where the first balance cylinder 30 is provided with the plurality of pre-tightening screw holes 32 and the first bearing 50 is correspondingly provided with the plurality of pre-tightening through holes, the first bearing 50 is pre-fastened with the first balance cylinder 30 by the first screw connection 80 passing through the plurality of pre-tightening through holes of the first bearing 50 and the plurality of pre-tightening screw holes 32 of the first balance cylinder 30 in order.

S20, penetrating the cylinder 20 into the eccentric section 12 of the crankshaft 10, and then aligning and assembling the first assembly and the cylinder 20 to form a second assembly.

And S30, penetrating the second balance cylinder 40 into the second shaft section 13 of the crankshaft 10, and pre-tightening and fixing the second balance cylinder 40 and the second assembly to form a third assembly.

In this step S30, the manner of pre-fastening the second balance cylinder 40 and the second module is not limited. Optionally, in the case that the cylinder 20 is provided with a plurality of pre-tightening limiting clamping grooves, and the second balance cylinder 40 is correspondingly provided with a plurality of pre-tightening limiting clamping blocks, the second balance cylinder 40 and the second component are pre-tightened and fixed to form the third component by clamping the pre-tightening limiting clamping blocks on the second balance cylinder 40 with the pre-tightening limiting clamping grooves on the cylinder 20 in a one-to-one correspondence manner.

And S40, penetrating the second bearing 60 into the second shaft section 13 of the crankshaft 10, and then fixing the second bearing 60, the second balance cylinder 40 and the cylinder 20 to the first balance cylinder 30 to complete the assembly of the pump body assembly.

In this step S40, the manner of fixing the second bearing 60, the second balance cylinder 40, and the cylinder 20 to the first balance cylinder 30 is not limited. Alternatively, in the case where the first balance cylinder 30 is provided with the plurality of fixing screw holes 33, and the cylinder 20, the second balance cylinder 40, and the second bearing 60 are each provided with the plurality of fixing through holes 42, the second balance cylinder 60, the second balance cylinder 40, the plurality of fixing through holes 42 of the cylinder 20, and the plurality of fixing screw holes 33 of the first balance cylinder 30 are sequentially passed through the second screw connection 90 to be fixed to the first balance cylinder 30, completing the assembly of the pump body assembly.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may include structural and other modifications. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A crankshaft assembly, comprising:

the crankshaft comprises a first shaft section, an eccentric section and a second shaft section which are sequentially connected;

the first crankshaft balance part is arranged on the first shaft section;

an eccentric portion disposed at the eccentric section;

the second crankshaft balance part is arranged on the second shaft section,

the first crankshaft balance part, the eccentric part and the second crankshaft balance part are arranged at intervals along the axial direction of the crankshaft, and the first crankshaft balance part axially corresponds to the second crankshaft balance part and is respectively positioned at two sides of the central axis of the crankshaft with the eccentric part.

2. A crankshaft assembly as claimed in claim 1, wherein,

a first preset distance d1 is arranged between the first crankshaft balance part and the eccentric part;

a second preset distance d2 is arranged between the second crankshaft balance part and the eccentric part,

wherein d1/d2 is more than or equal to 0.2 and less than or equal to 5.

3. A crankshaft assembly as claimed in claim 1, wherein,

the first crankshaft balance part is detachably connected to the crankshaft; and/or the number of the groups of groups,

the second crankshaft balance portion is detachably connected to the crankshaft.

4. The crankshaft assembly as claimed in claim 1, further comprising:

the piston is sleeved on the outer side of the eccentric part and comprises a plurality of arc-shaped sections which are detachably connected.

5. A pump body assembly comprising a crankshaft assembly as claimed in any one of claims 1 to 4.

6. The pump body assembly of claim 5, further comprising:

the motor rotor is arranged on the crankshaft and is positioned on the first shaft section;

the cylinder is used for defining a compression cavity, the eccentric part is positioned in the compression cavity, and the compression cavity provides a rotation space for the eccentric part;

the first balance cylinder is used for defining a first balance cavity, the first crankshaft balance part is positioned in the first balance cavity, the first balance cavity provides a rotation space for the first crankshaft balance part, and the first end of the first balance cylinder is connected with the first end of the cylinder;

the first bearing is connected with the second end of the first balance cylinder;

the second balance cylinder is used for limiting a second balance cavity, the second crankshaft balance part is positioned in the second balance cavity, the first balance cavity provides a rotation space for the first crankshaft balance part, and the first end of the second balance cylinder is connected with the second end of the cylinder;

a second bearing connected with the second end of the second balance cylinder,

the crankshaft sequentially penetrates through the first bearing, the first balance cylinder, the air cylinder, the second balance cylinder and the second bearing.

7. The pump body assembly of claim 6, wherein the pump body assembly comprises,

the height of the first crankshaft balance part is h1;

the height of the first balance cavity is H1,

wherein H1-H1 is less than or equal to 1mm and less than or equal to 6mm.

8. The pump body assembly of claim 6, wherein the pump body assembly comprises,

the height of the second crankshaft balance part is h2;

the height of the second balance cavity is H2,

wherein H2-H2 is less than or equal to 1mm and less than or equal to 6mm.

9. The pump body assembly of any one of claims 6 to 8, wherein,

the first balance cylinder is provided with a plurality of pre-tightening threaded holes, and the first bearing is correspondingly provided with a plurality of pre-tightening through holes for pre-tightening and fixing the first balance cylinder and the first bearing through a first threaded connecting piece;

the first balance cylinder is provided with a plurality of fixed threaded holes, the cylinder, the second balance cylinder and the second bearing are respectively provided with a plurality of fixed through holes correspondingly for fixing the cylinder, the second balance cylinder and the second bearing with the first balance cylinder through a second threaded connecting piece,

wherein the length of the second threaded connection is greater than the length of the first threaded connection.

10. A method of assembling a pump body assembly as claimed in any one of claims 6 to 9, comprising the steps of:

penetrating the first bearing into a first shaft section of the crankshaft, penetrating the first balance cylinder into the first shaft section of the crankshaft, and pre-fastening and shaping the first bearing and the first balance cylinder into a first assembly;

the cylinder penetrates through an eccentric section of the crankshaft, and then the first assembly and the cylinder are subjected to core adjustment assembly to form a second assembly;

penetrating the second balance cylinder into a second shaft section of the crankshaft, and pre-fastening and shaping the second balance cylinder and the second assembly into a third assembly;

and the second bearing is penetrated into a second shaft section of the crankshaft, and then the second bearing, the second balance cylinder and the air cylinder are fixed on the first balance cylinder, so that the pump body assembly is assembled.

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