Crank-free crankshaft and reciprocating compressor

Abstract

The utility model provides a crank-free crankshaft and a reciprocating compressor. The crankshaft comprises a main shaft, a crankshaft sleeve and a crankshaft sleeve, the first end of the main shaft is connected with the positioning main journal; the multiple driving main journals are sequentially arranged on the side, away from the main shaft, of the positioning main journal; the crank pins are arranged between the positioning main journals and the driving main journals and between every two driving main journals; the crankshaft has the beneficial effects that the crank pin is directly connected with the positioning main journal and the driving main journal, the main shaft can directly transmit a load to the crank pin, transmission through a crank arm is not needed, the maximum load capable of being borne by the crankshaft is greatly increased, the overall axial length of the crankshaft is reduced by canceling the crank arm, and the overall service life of the crankshaft is prolonged. The use of raw materials during forging is reduced, the cost is reduced, the overall size is reduced, the production cycle is shortened, and the size of the overall equipment is also reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of compressors, and in particular relates to a crankless crankshaft and a reciprocating compressor. Background Art

[0002] A crankshaft of a reciprocating compressor is mainly composed of three parts: the main journal, the crank pin and the crank arm. Each crank contains two crank pins, and the relative crank angle is 180°. The two crank pins and the crank pin and the main journal are connected by crank arms. When the compressor is running, the crankshaft is driven to rotate by the motor through the flange, and the motion load between the main journal and the crank pin is transmitted through the crank arm.

[0003] With the increase in the tonnage of reciprocating compressor units, in order to meet the force requirements of the units, the crankshaft dimensions of large units are getting larger and larger, and the corresponding size of the entire compressor and the area occupied by the compressor will increase, which puts higher requirements on the installation and transportation of the units; at the same time, the increase in the crankshaft dimensions also brings higher difficulty to the mechanical processing of the crankshaft, and the processing cycle is getting longer and longer, which brings great difficulties to the development and manufacturing of the entire unit, and increases the manufacturing cost of the unit. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology.

[0005] In order to solve the above problems, the present application provides a crankless crankshaft in a first aspect, the crankshaft comprising:

[0006] Spindle;

[0007] A positioning main shaft neck, the first end of the main shaft is connected to the positioning main shaft neck;

[0008] A driving main shaft journal, wherein a plurality of the driving main shaft journals are sequentially arranged on a side of the positioning main shaft journal away from the main shaft;

[0009] A crank pin is provided between the positioning main journal and the driving main journal and between each pair of driving main journals.

[0010] Optionally, both sides of the outer circumference of the positioning main journal extend outward in the radial direction to form an outer extension edge.

[0011] Optionally, the axes of the positioning main journal and the driving main journal are the same as the axis of the main shaft.

[0012] Optionally, the axis of each crank pin is radially offset from the axis of the main shaft by the same distance.

[0013] Optionally, a flange is also included, and the flange is arranged on the second end of the main shaft.

[0014] Optionally, the flange, main shaft, positioning main journal, driving main journal and crank pin are an integrally formed structure.

[0015] Optionally, a support member is further included, wherein the support member is connected to the driving main journal and is used to support the driving main journal.

[0016] The second aspect of the present application provides a reciprocating compressor, comprising a crankless crankshaft according to any technical solution in the first aspect. Since the crankless crankshaft according to any of the above technical solutions has the beneficial effects of any of the above technical solutions, they will not be described one by one here.

[0017] Beneficial Effects

[0018] A crankless crankshaft and a reciprocating compressor provided in the embodiments of the utility model have the following beneficial effects: the main shaft can directly transfer the load to the crank pin through the crank pin directly connected to the positioning main journal and the driving main journal without the need for transmission through the crank arm, so that the maximum load that the crankshaft can withstand is greatly improved, and by eliminating the crank arm, its overall axial length is shortened, reducing the use of raw materials during forging and reducing costs. In addition, the overall size is reduced, shortening the production cycle and reducing the volume of the overall equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the main structural diagram of the utility model;

[0020] Figure 2 It is a side view structural diagram of the utility model;

[0021] Figure 3 It is a schematic diagram of the crank pin axis of the utility model;

[0022] Figure 4 This is a structural diagram of the crank pin and the driving main journal connection of the utility model.

[0023] The reference numerals are as follows:

[0024] 1. Crankshaft; 11. Main shaft; 12. Positioning main journal; 13. Driving main journal; 14. Crank pin; 15. Outer edge; 16. Flange. DETAILED DESCRIPTION

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0028] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0029] See also Figure 1-4 As shown, according to the first aspect of the present application, a crankless crankshaft is provided, and the crankshaft 1 comprises:

[0030] Spindle 11;

[0031] A positioning main journal 12, to which the first end of the main shaft 11 is connected;

[0032] A driving main journal 13, wherein a plurality of the driving main journals 13 are sequentially arranged on a side of the positioning main journal 12 away from the main shaft 11;

[0033] A crank pin 14 is provided between the positioning main journal 12 and the driving main journal 13 and between each pair of the driving main journals 13 .

[0034] Specifically, the main shaft 11 is connected to the external driving component, driving the positioning main journal 12, the driving main journal 13 and the crank pin 14 to rotate, and the crank pin 14 is connected to the connecting rod, which can drive the connecting rod to move back and forth, so as to realize the transmission of force and the conversion of motion form; in this embodiment, the crank pin 14 is directly installed between the positioning main journal 12 and the driving main journal 13, and there is no crank arm between the positioning main journal 12 and the driving main journal 13 and the crank pin 14, so that the positioning main journal 12 can directly transfer the load to the crank pin 14 without transmitting through the crank arm, so that the load borne by the crankshaft 1 can be greatly improved; further, the crankshaft 1 in this embodiment cancels the crank arm, so that the main shaft 11 is directly connected to the positioning main journal 12, and the crank pin 14 is installed between the positioning main journal 12 and the driving main journal 13 and between the driving main journals 13, so that the relative columns share one crank pin 14, so that the length of the crankshaft 1 in the axial direction becomes smaller, and the more the number of unit columns, the more the size is reduced;

[0035] Among them, in the prior art, the maximum radial dimension of the crankshaft with a crank arm is determined by the crank arm, so the selection of forging raw materials during forging must take the size of the crank arm into consideration; while in this embodiment, after the crank arm is eliminated, the maximum radial dimension of the crankshaft 1 is directly determined by the distance between the outer circumferences of the crank pins 14. Compared with the prior art, the radial dimension is reduced, which directly reduces the use of raw materials and reduces costs. In addition, the structure is relatively simple, shortens the processing cycle and difficulty, and further reduces the volume of the compressor unit to be installed.

[0036] Both sides of the outer circumference of the positioning main journal 12 extend outwardly in the radial direction to form an outer extension edge 15.

[0037] Specifically, by providing outer extension edges 15 on both sides of the outer circumference of the main shaft neck 11, the main shaft neck 12 is positioned and installed between the compressor casings. While supporting the crankshaft 1, it can also perform axial positioning, reduce axial movement during use, improve stability, and further prevent lubricating oil from overflowing, thereby improving service life and working accuracy.

[0038] The axes of the positioning main journal 12 and the driving main journal 13 are the same as the axis of the main shaft 11 .

[0039] Specifically, by positioning the main journal 12 and driving the main journal 13 to be aligned with the axis of the main shaft 11 , the stability of the crankshaft 1 during rotation is further improved.

[0040] The axis of each crank pin 14 is radially offset from the axis of the main shaft 11 by the same distance.

[0041] Specifically, by setting the axis of each crank pin 14 to have the same radial deviation distance from the axis of the main shaft 11, when the crankshaft 1 is working, each crank pin 14 drives the connecting rod to move longitudinally by the same distance. Furthermore, the vibration and impact of the entire crankshaft 1 during operation can be reduced, the operation is more stable, the force transmitted by each connecting rod is relatively uniform, and the situation of excessive local force is reduced.

[0042] It also includes a flange 16 , which is disposed on the second end of the main shaft 11 .

[0043] Specifically, the flange 16 is installed on the main shaft 11 , and is connected to other components through the flange 16 to achieve power transmission and ensure the coaxiality and stability of the rotating crankshaft 1 .

[0044] The flange 16 , the main shaft 11 , the positioning main journal 12 , the driving main journal 13 and the crank pin 14 are an integrally formed structure.

[0045] Specifically, the flange 16 , the main shaft 11 , the positioning main journal 12 , the driving main journal 13 and the crank pin 14 are integrally forged, which can improve their strength and integrity, and enhance product quality and performance.

[0046] It also includes a support member, which is connected to the driving main journal 13 and is used to support the driving main journal 13 .

[0047] Specifically, since the axis of each driving main journal 13 is the same as that of the main shaft 11, a support member can be installed at the bottom of each driving main journal 13. The support member can support each driving main journal 13 when the crankshaft 1 rotates, effectively share the load borne by the driving main journal 13, reduce the friction coefficient, reduce wear, help maintain the rotation accuracy of the driving main journal 13, ensure the movement accuracy of the crankshaft 1, improve the stability of the crankshaft 1 at high-speed rotation, and reduce vibration and shaking.

[0048] The support member is connected to the main drive journal 13 via a bearing, which further reduces the friction between the support member and the main drive journal 13 and reduces wear.

[0049] According to the second aspect of the present application, a reciprocating compressor is provided, comprising a crankless crankshaft as in any one of the embodiments of the first aspect. Since the crankless crankshaft has any of the above embodiments, it has the beneficial effects of any of the above embodiments, which will not be described in detail here.

[0050] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A crankshaft without a crank, characterized in that: The crankshaft (1) comprises: Spindle (11); A positioning main shaft neck (12), the first end of the main shaft (11) being connected to the positioning main shaft neck (12); A driving main shaft journal (13), wherein a plurality of the driving main shaft journals (13) are sequentially arranged on a side of the positioning main shaft journal (12) away from the main shaft (11); A crank pin (14) is provided between the positioning main journal (12) and the driving main journal (13) and between each pair of the driving main journals (13).

2. The crankshaft without a crank according to claim 1, characterized in that: Both sides of the outer circumference of the positioning main journal (12) extend outwards in the radial direction thereof to form outer extension edges (15).

3. The crankshaft without a crank according to claim 2, characterized in that: The axes of the positioning main journal (12) and the driving main journal (13) are the same as the axis of the main shaft (11).

4. The crankshaft without a crank according to claim 3, characterized in that: The axis of each crank pin (14) is radially offset from the axis of the main shaft (11) by the same distance.

5. The crankshaft without a crank according to claim 4, characterized in that: It also includes a flange (16), which is arranged on the second end of the main shaft (11).

6. The crankshaft without a crank according to claim 5, characterized in that: The flange (16), the main shaft (11), the positioning main journal (12), the driving main journal (13) and the crank pin (14) are an integrally formed structure.

7. The crankshaft without a crank according to claim 6, characterized in that: It also comprises a support member, which is connected to the main drive journal (13) and is used to support the main drive journal (13).

8. A reciprocating compressor, characterized in that: Comprising a crankless crankshaft as claimed in any one of claims 1-7.

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