Crankshaft structure, compressor and mounting method of compressor

Abstract

The invention belongs to the technical field of compressor crankshaft machining, and discloses a crankshaft structure, a compressor and an installation method of the compressor. The crankshaft comprises a cylindrical crankshaft body, the crankshaft body sequentially forms a long shaft end, a middle section and a short shaft end, the radius of the long shaft end is r, the radius of the short shaft end is r2, the radius of the middle section is r1, r > = r1 > = r2, the long shaft end is detachably sleeved with a first eccentric part, the short shaft end is provided with a second eccentric part, and the middle section is sleeved with a middle plate. The middle section is lower than the first piston; the first eccentric part is sleeved with the first piston, then the long shaft section is sleeved with the first eccentric part, and the second eccentric part is sleeved with the second piston; the problems that in the prior art, a crankshaft is long, the strength is reduced, and the machining cost is high are solved.

Description

Technical Field

[0001] The invention relates to the technical field of compressor crankshaft processing, and in particular to a crankshaft structure, a compressor and an installation method thereof. Background Art

[0002] A crankshaft is installed in the compressor, and an eccentric part is formed on the crankshaft. Usually, two sets of eccentric parts are provided, all close to one end of the crankshaft. A long axis end and a short axis end are formed on both sides of the crankshaft, respectively. Usually, the radius of the long axis end is larger than the radius of the short axis end. The eccentric part is arranged between the long axis end and the short axis end. The distance between the axis of the eccentric part and the axis of the crankshaft is the eccentricity. In order to obtain a larger cooling capacity, the usual practice is to increase the eccentricity. Under the existing technology, the axis and the eccentric part on the crankshaft are directly cut and formed into one piece, but the cost of such processing is high. Whenever an eccentric part of a different size is needed, the raw materials need to be reused for reprocessing, which is time-consuming and costly.

[0003] In addition, before the crankshaft is placed inside the compressor, a piston sleeve will be sleeved on the outside of the eccentric part. However, due to the large eccentricity, the piston sleeve on the side close to the long shaft end of the crankshaft cannot be sleeved on the eccentric part from the long shaft end. At this time, since the radius of the piston sleeve is the same as the radius of the eccentric part, if the sum of the eccentricity and the radius of the long shaft end is greater than the radius of the eccentric part, the piston sleeve will be sleeved on the long shaft end and abut against one side of the eccentric part, and a limit will occur, and it will be unable to continue to be sleeved into the eccentric part. This requires sleeved the piston sleeve from one side of the short shaft end, which requires a transition zone to be set between the two groups of eccentric parts. The height of the transition zone needs to be greater than the height of the piston sleeve to facilitate the piston sleeve to pass through the transition zone and align with the eccentric part on the side of the long shaft end for sleeve connection. However, due to the increase in the length of the transition zone, the length of the crankshaft will become longer, the deformation of the crankshaft will be larger during operation, and the strength of the crankshaft will be reduced. At the same time, the processing of the crankshaft with double eccentric parts is more complicated, the parts cannot be standardized, and the production cost is higher. Summary of the invention

[0004] The object of the present invention is to provide a crankshaft structure, a compressor and an installation method thereof, so as to solve the problems of the prior art that the crankshaft is long, the strength is reduced and the processing cost is high.

[0005] To achieve this purpose, the present invention adopts the following technical solutions: The present invention provides a crankshaft structure, including a crankshaft body, the crankshaft body is cylindrical, the crankshaft body is sequentially formed with a long axis end, a middle section and a short axis end, the radius of the long axis end is r, the radius of the short axis end is r2, the radius of the middle section is r1, r≥r1≥r2, the side of the middle section close to the long axis end is the long axis section, the side of the middle section close to the short axis end is the short axis section, the long axis section is detachably sleeved with a first eccentric part, the short axis section is mounted with a second eccentric part, the middle section is sleeved with an intermediate plate, and the height of the middle section is less than the height of the first piston;

[0006] The first piston is sleeved on the outside of the first eccentric part, and then the first eccentric part is sleeved on the crankshaft body along the long axis end, and the second piston is sleeved on the outside of the second eccentric part.

[0007] Preferably, a first protrusion is formed on the outer side of the long axis segment, a first groove is formed on the inner side of the first eccentric portion, and the first protrusion is inserted into the first groove.

[0008] Preferably, the first protrusion is a first rectangular column, the length direction of the first rectangular column is parallel to the axis of the long axis end, the first groove is a first rectangular groove, and the first rectangular column is inserted into the first rectangular groove.

[0009] Preferably, the second eccentric portion is inserted into the short shaft segment along one side of the short shaft end.

[0010] Preferably, a second groove is formed on the inner side of the second eccentric portion, and a second protrusion is formed on the outer side of the short shaft segment, and the second protrusion is inserted into the second groove.

[0011] Preferably, the second protrusion is a second rectangular cylinder, the second groove is a second rectangular groove, the length direction of the second groove is parallel to the axis of the crankshaft body, and the second rectangular cylinder is inserted into the second rectangular groove.

[0012] Preferably, the first eccentric portion and the second eccentric portion respectively include at least one group, and the first eccentric portion and the second eccentric portion can be replaceably installed on the crankshaft body.

[0013] Preferably, the first eccentric portion and the second eccentric portion have the same structure, both of which include an eccentric body, a mounting hole is formed on the eccentric body, the crankshaft body is inserted into the mounting hole, the eccentric body is a cylinder, the mounting hole is a cylindrical hole, and the distance between the axis of the eccentric body and the axis of the mounting hole is the eccentricity.

[0014] A compressor comprises the crankshaft structure described above, wherein a cavity is formed inside the compressor, and the crankshaft body is rotatably installed in the cavity.

[0015] A compressor installation method includes the compressor described above, wherein the short shaft section and the second eccentric portion are integrally formed, and includes the following steps:

[0016] S1, install the middle plate on the middle section;

[0017] S2, inserting the first eccentric portion onto the long axis section of the crankshaft body along one side of the long axis end;

[0018] S3, sleeve the first piston sleeve onto the first eccentric portion along the major axis end;

[0019] S4, sleeve the second piston sleeve onto the second eccentric portion along the short shaft end;

[0020] S5, sleeve the upper cylinder and the lower cylinder on the first eccentric part and the second eccentric part respectively, and install the upper cylinder cover on the upper side of the upper cylinder and the lower cylinder cover on the lower side of the lower cylinder.

[0021] Preferably, when the short shaft section and the second eccentric portion are in a separated state, S3 is to sleeve the first piston sleeve onto the first eccentric portion along the long shaft end or the short shaft end;

[0022] Preferably, between S3 and S4, the second eccentric portion is also inserted into the short shaft section of the crankshaft body along one side of the short shaft end.

[0023] Beneficial effect: Since the first eccentric part is separated from the crankshaft body, the first piston can be sleeved on the outside of the first eccentric part before the first eccentric part is installed on the body, and then the first eccentric part is sleeved on the crankshaft body along one side of the long axis end. The first piston does not need to cross the middle section to sleeve on the first eccentric part, so the height of the middle section can be shortened, the distance between the first eccentric part and the second eccentric part can be close, the length of the entire crankshaft body can be shortened, and the processing cost can be reduced. Then, the installed crankshaft structure is respectively sleeved in the upper cylinder and lower cylinder of the corresponding structure to complete the assembly, thereby improving the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the assembly diagram of the crankshaft structure of the present invention;

[0025] Figure 2 It is a main body diagram of the crankshaft of the present invention;

[0026] Figure 3 This is a main diagram of the first eccentric portion of the present invention;

[0027] Figure 4 It is a main body diagram of the second eccentric part of the present invention;

[0028] Figure 5 It is installed on the crankshaft body of the present invention (without the second eccentric part plugged in);

[0029] Figure 6 It is a cross-sectional view of the compressor of the present invention.

[0030] In the figure: 1- crankshaft body; 11- long axis end; 12- middle section; 13- short axis end; 14- first protrusion; 15- second protrusion; 2- first eccentric portion; 21- first groove; 3- second eccentric portion; 31- second groove; 4- eccentric body; 41- mounting hole; 5- middle plate; 6- first piston; 7- second piston; 8- upper cylinder; 9- lower cylinder; 10- upper cylinder head; 20- lower cylinder head. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] The eccentric part on the double eccentric crankshaft under the existing technology needs to be sleeved with a piston, but since the radius on one side of the long axis end is larger and the eccentricity of the eccentric part on the long axis end is larger, the piston abuts against the side of the eccentric part and the piston is sleeved on the long axis end and cannot continue to move toward the side of the eccentric part. Therefore, it will cause the piston to be limited when it is sleeved along the long axis end to the eccentric part. The piston cannot be sleeved on the outside of the eccentric part and can only be inserted from the short axis end at the bottom. In order to enable the piston to move between the two eccentric parts, the center section between the eccentric parts will be lengthened, and the length of the center section will be greater than the length of the piston to avoid the piston being limited, so that the piston can be directly sleeved on the eccentric part on the long axis end along the short axis end. This will lengthen the length of the crankshaft body and increase the processing cost.

[0036] Embodiment 1

[0037] In order to solve the above problems, Figures 1 to 6 As shown, the present invention provides a crankshaft structure, which includes a crankshaft body 1, the crankshaft body 1 is cylindrical, and the crankshaft body 1 is sequentially formed with a long axis end 11, a middle section 12 and a short axis end 13, the radius of the long axis end 11 is r, the radius of the short axis end 13 is r2, the radius of the middle section 12 is r1, r≥r1≥r2, the side of the middle section 12 close to the long axis end 11 is the long axis section, and the side of the middle section close to the short axis end is the short axis section, the long axis section is detachably sleeved with a first eccentric portion 2, the short axis section is mounted with a second eccentric portion 3, the middle section 12 is sleeved with an intermediate plate 5, and the height of the middle section 12 is less than the height of the first piston 6;

[0038] The first piston 6 is sleeved on the outside of the first eccentric part 2 , and then the first eccentric part 2 is sleeved on the crankshaft body 1 at the lower side of the long axis end 11 , and the second piston 7 is sleeved on the outside of the second eccentric part 3 .

[0039] Before the first eccentric portion 2 is installed on the crankshaft body 1, the first piston 6 can be sleeved on the first eccentric portion 2 in advance, so that the first piston 6 does not need to approach the long axis end 11 from the short axis end 13 along the middle end, so the length of the middle section 12 can be shortened, thereby shortening the overall length of the crankshaft body 1 and reducing the processing cost. At the same time, the thickness of the middle plate 5 is also reduced to reduce the processing cost. The distance between the first eccentric portion 2 and the second eccentric portion 3 can be closer, the length of the crankshaft is shortened, the deformation of the crankshaft body 1 is reduced, and the strength of the crankshaft body 1 is improved.

[0040] A first protrusion 14 is formed on the outer surface of the long axis section, and a first groove 21 is formed on the inner side of the first eccentric portion 2, and the first protrusion 14 is inserted into the first groove 21. The first protrusion 14 is a first rectangular cylinder, and the length direction of the cylinder is parallel to the axis of the long axis end 11, and the first groove 21 is a first rectangular groove, and the first rectangular cylinder is inserted into the first rectangular groove.

[0041] Since the crankshaft body 1 rotates along its axis when working in the compressor, the first eccentric portion 2 can be limited by setting the first groove 21 and the first protrusion 14, so that the first eccentric portion 2 can rotate synchronously with the crankshaft body 1. It should be particularly noted that the cross-section of the first groove 21 and the first protrusion 14 is rectangular, or can be triangular or other shapes. The first eccentric portion 2 can be processed into different eccentricities according to needs and installed on the crankshaft body 1 in a replaceable form. Since the first eccentric portion 2 can be processed separately, the processing amount is reduced, so the processing cost of the entire crankshaft structure can be reduced.

[0042] Afterwards, the crankshaft body 1 of the present invention can be installed in the cavity of the compressor according to the following steps:

[0043] S1, installing the middle plate 5 on the middle section 12;

[0044] S2, inserting the first eccentric portion 2 onto the long axis section of the crankshaft body 1 along one side of the long axis end 11;

[0045] S3, sleeve the first piston 6 onto the first eccentric portion 2 along the long axis end 11;

[0046] S4, sleeve the second piston 7 onto the second eccentric portion 3 along the short shaft end 13;

[0047] S5, sleeve the upper cylinder 8 and the lower cylinder 9 onto the first eccentric part 2 and the second eccentric part 3 respectively, and install the upper cylinder cover 10 on the upper side of the upper cylinder 8, and install the lower cylinder cover 20 on the lower side of the lower cylinder 9.

[0048] Embodiment 2

[0049] like Figures 1 to 6 As shown, the first eccentric portion 2 and the second eccentric portion 3 of the present invention are respectively inserted into the crankshaft body 1 along the major axis end 11 and the minor axis end 13 and the end. Before the first eccentric portion 2 and the second eccentric portion 3 need to be installed, the first piston 6 and the second piston 7 can be sleeved on the first eccentric portion 2 and the second eccentric portion 3. The first piston 6 does not need to cross the middle section 12 for sleeve connection, which can shorten the length of the middle section 12 and the length of the entire crankshaft body 1. At the same time, the crankshaft body 1 is a pure cylindrical structure, and only the first protrusion 14 and the second protrusion 15 are formed on the crankshaft body 1, wherein the radii at different positions are different, wherein the radius of the major axis end 11 is r, the radius of the minor axis end 13 is r2, and the radius of the middle section 12 is r1, r≥r1≥r2, wherein the corresponding mounting hole 41 inside the first eccentric portion 2 has a radius of R, the mounting hole 41 inside the second eccentric portion 3 has a radius of R2, and the mounting hole 41 of the middle plate 5 on the middle section 12 has a radius of R1, which also satisfies R≥R1≥R2.

[0050] A second groove 31 is formed inside the second eccentric portion 3, and a second protrusion 15 is formed outside the short shaft end 13, and the second protrusion 15 is inserted into the second groove 31. The second protrusion 15 is a second rectangular column, and the second groove 31 is a second rectangular groove. The length direction of the second groove 31 is parallel to the axis of the crankshaft body 1, and the second rectangular column is inserted into the second rectangular groove.

[0051] The first eccentric portion 2 and the second eccentric portion 3 are matched with each other through the groove and the protrusion of the rectangular cross section, so that the first eccentric portion 2 and the second eccentric portion 3 can rotate synchronously with the crankshaft body 1.

[0052] The first eccentric portion 2 and the second eccentric portion 3 are processed into multiple groups according to different eccentric amounts, and can be replaced according to different working ranges of the compressor to perform flexible matching and reduce processing costs. The first eccentric portion 2 and the second eccentric portion 3 can be replaceably installed on the crankshaft body 1.

[0053] The first eccentric portion 2 and the second eccentric portion 3 have the same structure. The first eccentric portion 2 and the second eccentric portion 3 both include an eccentric body 4. A mounting hole 41 is formed on the eccentric body 4. The crankshaft body 1 is inserted into the mounting hole 41. The eccentric body 4 is a cylinder. The mounting hole 41 is a cylindrical hole. The distance between the axis of the eccentric body 4 and the axis of the mounting hole 41 is the eccentricity. The first eccentric portion 2 and the second eccentric portion 3 with different lengths and eccentricities can be manufactured according to different cavity sizes and different cooling capacities in the compressor. When replacement is needed, they can be directly plugged into the crankshaft body 1 for replacement.

[0054] Afterwards, the crankshaft body 1 of the present invention can be installed in the cavity of the compressor according to the following steps:

[0055] S1, installing the middle plate 5 on the middle section 12;

[0056] S2, inserting the first eccentric portion 2 onto the long axis section of the crankshaft body 1 along one side of the long axis end 11;

[0057] S3, sleeve the first piston 6 onto the first eccentric portion 2 along the major axis end 11 or the minor axis end 13;

[0058] S4, steps S3 and S4 also include inserting the second eccentric portion 3 along one side of the short shaft end 13 onto the short shaft section of the crankshaft body 1

[0059] S5, sleeve the second piston 7 onto the second eccentric portion 3 along the short shaft end 13;

[0060] S6, sleeve the upper cylinder 8 and the lower cylinder 9 onto the first eccentric part 2 and the second eccentric part 3 respectively, and install the upper cylinder cover 10 on the upper side of the upper cylinder 8, and install the lower cylinder cover 20 on the lower side of the lower cylinder 9.

[0061] Embodiment 3

[0062] The first eccentric portion 2 of the present invention can be integrated with the crankshaft body 1, and the second eccentric portion 3 therein is inserted into the crankshaft body 1, so that when the first piston 6 is sleeved on the first eccentric portion 2, it can be directly sleeved from one side of the short shaft end 13. Since the second eccentric portion 3 has not yet been installed, the first piston 6 can be directly sleeved on the first eccentric portion 2, and there is no need to reserve space for lateral displacement of the first piston 6 in the middle section 12, so the length of the middle section 12 can be shortened, thereby shortening the length of the crankshaft body 1.

[0063] When assembling the compressor, the steps of this embodiment are similar to those of the first embodiment, and the first eccentric portion and the second eccentric portion are simply swapped.

[0064] It should be particularly noted that the first eccentric portion 2 and the second eccentric portion 3 used in the present invention are not necessarily installed on the crankshaft body 1 by means of slots, and can also be connected to the crankshaft body 1 by other means such as gluing.

[0065] A cavity is formed inside the compressor of the present invention, and a crankshaft body 1 is rotatably installed in the cavity.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A crankshaft structure, characterized in that: The crankshaft comprises a crankshaft body (1), the crankshaft body (1) is cylindrical, the crankshaft body (1) is sequentially formed with a long axis end (11), a middle section (12) and a short axis end (13), the long axis end (11) has a radius of r, the short axis end (13) has a radius of r2, the middle section (12) has a radius of r1, r≥r1≥r2, the side of the middle section (12) close to the long axis end (11) is the long axis section, the side of the middle section close to the short axis end is the short axis section, the long axis section is detachably sleeved with a first eccentric portion (2), the short axis section is mounted with a second eccentric portion (3), the middle section (12) is sleeved with an intermediate plate (5), and the height of the middle section (12) is less than the height of the first piston (6); The first piston (6) is sleeved on the outside of the first eccentric part (2), and then the first eccentric part (2) is sleeved on the crankshaft body (1) along the long axis end (11), and the second piston (7) is sleeved on the outside of the second eccentric part (3).

2. The crankshaft structure according to claim 1, characterized in that: A first protrusion (14) is formed on the outer side of the long shaft section, a first groove (21) is formed on the inner side of the first eccentric portion (2), and the first protrusion (14) is inserted into the first groove (21).

3. The crankshaft structure according to claim 2, characterized in that: The first protrusion (14) is a first rectangular column, the length direction of the first rectangular column is parallel to the axis of the long axis end (11), and the first groove (21) is a first rectangular groove, and the first rectangular column is inserted into the first rectangular groove.

4. The crankshaft structure according to claim 1, characterized in that: The second eccentric portion (3) is inserted into the short shaft section along one side of the short shaft end (13).

5. The crankshaft structure according to claim 4, characterized in that: A second groove (31) is formed on the inner side of the second eccentric portion (3), a second protrusion (15) is formed on the outer side of the short shaft section, and the second protrusion (15) is inserted into the second groove (31).

6. The crankshaft structure according to claim 5, characterized in that: The second protrusion (15) is a second rectangular column, the second groove (31) is a second rectangular groove, the length direction of the second groove (31) is parallel to the axis of the crankshaft body (1), and the second rectangular column is inserted into the second rectangular groove.

7. The crankshaft structure according to claim 4, characterized in that: The first eccentric part (2) and the second eccentric part (3) respectively include at least one group, and the first eccentric part (2) and the second eccentric part (3) can be replaceably mounted on the crankshaft body (1).

8. The crankshaft structure according to claim 4, characterized in that: The first eccentric part (2) and the second eccentric part (3) have the same structure. The first eccentric part (2) and the second eccentric part (3) both comprise an eccentric body (4). A mounting hole (41) is formed on the eccentric body (4). The crankshaft body (1) is inserted into the mounting hole (41). The eccentric body (4) is a cylinder. The mounting hole (41) is a cylindrical hole. The distance between the axis of the eccentric body (4) and the axis of the mounting hole (41) is the eccentricity.

9. A compressor, characterized in that: It comprises the crankshaft structure as claimed in claim 4, wherein a cavity is formed inside the compressor, and the crankshaft body (1) is rotatably mounted in the cavity.

10. A compressor installation method, characterized in that: The compressor according to claim 9, wherein the short shaft section and the second eccentric portion are integrally formed, comprises the following steps: S1, installing the middle plate (5) on the middle section (12); S2, inserting the first eccentric portion (2) onto the long axis section of the crankshaft body (1) along one side of the long axis end (11); S3, sleeve the first piston (6) onto the first eccentric portion (2) along the long axis end (11); S4, sleeve the second piston (7) onto the second eccentric portion (3) along the short shaft end (13); S5, the upper cylinder (8) and the lower cylinder (9) are respectively sleeved on the first eccentric part (2) and the second eccentric part (3), and the upper cylinder cover (10) is installed on the upper side of the upper cylinder (8), and the lower cylinder cover (20) is installed on the lower side of the lower cylinder (9).

11. The compressor installation method according to claim 10, characterized in that: When the short shaft section and the second eccentric part (3) are in a separated state, S3 is to sleeve the first piston (6) onto the first eccentric part (2) along the long shaft end (11) or the short shaft end (13).

12. The compressor installation method according to claim 11, characterized in that: The method between S3 and S4 also includes inserting the second eccentric portion (3) onto the short shaft section of the crankshaft body (1) along one side of the short shaft end (13).

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