WO2017000129A1

WO2017000129A1 - Crankshaft for reciprocating compressor and reciprocating compressor provided with same

Info

Publication number: WO2017000129A1
Application number: PCT/CN2015/082679
Authority: WO
Inventors: 严志奇; 宋庆华; 宋东东
Original assignee: 安徽美芝制冷设备有限公司; 美的集团股份有限公司
Priority date: 2015-06-29
Filing date: 2015-06-29
Publication date: 2017-01-05

Abstract

A crankshaft for a reciprocating compressor and the reciprocating compressor provided with the same. The crankshaft (100) comprises a main shaft (110), a crank (120), and an eccentric block (130). The main shaft (110) and the crank (120) are respectively disposed on two sides of the eccentric block (130), the main shaft (110) and the eccentric block (130) are welded and fixed, and the crank (120) and the eccentric block (130) are welded and fixed.

Description

Crankshaft for reciprocating compressor and reciprocating compressor having same

Technical field

The present invention relates to the field of refrigeration equipment, and more particularly to a crankshaft for a reciprocating compressor and a reciprocating compressor having the same.

Background technique

The crankshaft of the reciprocating piston compressor is generally cast-formed for the purpose of wear resistance. The axial oil supply passage of the cast crankshaft needs to be obtained by machining. Due to the long oil supply passage, the processing is troublesome; the reciprocating piston compressor The integrally cast crankshaft has an eccentric structure. In order to ensure the parallelism of the main shaft and the crank, the requirements for the crankshaft processing equipment are relatively high, and the manufacturability is poor.

When re-planning the displacement of the reciprocating piston compressor, the parameters such as the crankshaft shaft diameter and the eccentric amount are usually changed. According to the conventional scheme, the crank casting mold must be redesigned, the versatility of the mold is poor, and the degree of standardization is low; Considering the considerations of energy saving, environmental protection and environmental protection, the metal casting thermoforming process has serious environmental pollution and consumes a lot of energy.

Summary of the invention

The present invention aims to solve at least one of the above technical problems in the prior art to some extent. Accordingly, it is an object of the present invention to provide a crankshaft for a reciprocating compressor which is simple to mold and easy to process.

Another object of the present invention is to provide a compressor having the above crankshaft.

A crankshaft for a reciprocating compressor according to the present invention includes: a main shaft, a crank, and an eccentric block, the main shaft and the crank are respectively disposed at both sides of the eccentric block, and the main shaft and the eccentric block and The crank and the eccentric block are respectively welded and fixed.

According to the crankshaft for a reciprocating compressor of the present invention, the main shaft, the crank and the eccentric block are separate components, and the main shaft and the crank are respectively fixed to both sides of the eccentric block by welding, whereby the crankshaft is simple in forming and easy to process. Since the main shaft and the crank are made of a hollow steel pipe, the quality of the crankshaft is light, at least to some extent, the power of the reciprocating compressor during operation is lowered, and the reliability of the reciprocating compressor is improved.

In addition, since the crankshaft of the present invention is processed by welding, the conventional crankshaft is cast-formed, and the environment is basically free from pollution and the energy consumption is lower.

Further, the crankshaft for a reciprocating compressor according to the present invention may also have the following additional technical features:

According to an embodiment of the present invention, a spindle closer to the eccentric block is provided with a spindle flange welding portion, and a crank closer to the eccentric block is provided with a crank flange welding portion.

According to an embodiment of the present invention, the main shaft flange welding portion is annular and orthogonal to an axial direction of the main shaft, the main shaft flange welding portion has a width of not less than 2 mm; and the crank flange welding portion is annular And orthogonal to the axial direction of the crank, the width of the crank flange welding portion is not less than 2 mm.

According to an embodiment of the present invention, the eccentric block has a main shaft side surface facing the main shaft and a crank side surface facing the crank, and the main shaft side surface is provided with positioning for the main shaft flange welding portion A spindle side positioning recess on which a crank side positioning recess for positioning the crank flange welding portion is provided.

According to an embodiment of the invention, the main shaft, the crank and the eccentric mass are made of low carbon steel, medium carbon steel or alloy steel.

According to an embodiment of the invention, the eccentric block is provided with an eccentric block oil hole communicating with the inside of the crankshaft.

According to an embodiment of the invention, the eccentric block oil hole has a pore diameter of not less than 2 mm.

According to an embodiment of the invention, the spindle is provided with at least one spindle oil hole, and the crank is provided with at least one crank oil hole.

According to an embodiment of the present invention, the outer surface of the main shaft is provided with a carburized layer, a nitrided layer, a soft nitride layer or a carbonitrided layer; the outer surface of the crank is provided with a carburized layer and a nitrided layer. , soft nitride layer or carbonitrided layer.

The reciprocating compressor according to the present invention includes the above-described crankshaft. Since the reciprocating compressor according to the present invention is provided with the above-described crankshaft, the reciprocating compressor is simple in molding, easy to process, and the power during operation of the compressor is lowered. The reliability of the compressor has been improved.

DRAWINGS

1 is a schematic view of a crankshaft according to an embodiment of the present invention;

2 is a schematic view of a main shaft according to an embodiment of the present invention;

Figure 3 is a schematic illustration of a crank in accordance with an embodiment of the present invention;

4 is a schematic illustration of the front and back sides of an eccentric block in accordance with an embodiment of the present invention.

Reference mark:

Crankshaft 100,

Spindle 110, spindle flange welding portion 111, spindle oil supply passage 101, spindle oil hole 107,

Crank 120, crank flange welding portion 121, crank oil supply passage 102, crank oil hole 108,

The eccentric block 130, the main shaft side positioning concave portion 131, the crank side positioning concave portion 132, the eccentric block oil hole 104, the main shaft side surface 105, and the crank side surface 106.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation or position of indications such as "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. The relationship is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of the description of the invention and the simplification of the description, and does not indicate or imply that the device or component referred to has a specific orientation, is constructed and operated in a specific orientation, and thus It is not to be understood as limiting the invention.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include one or more of the features either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical connection, can also be electrically connected or can communicate with each other; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, the first feature "on" or "under" the second feature may include direct contact of the first and second features, and may also include first and second features, unless otherwise specifically defined and defined. It is not in direct contact but through additional features between them. Moreover, the first feature "above", "above" and "above" the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and below the second feature, or merely the first feature level being less than the second feature.

A crankshaft 100 for a reciprocating compressor according to an embodiment of the present invention will be described in detail below with reference to FIGS. 1 through 4.

A crankshaft 100 for a reciprocating compressor according to an embodiment of the present invention includes a main shaft 110, a crank 120, and an eccentric block 130. The main shaft 110 and the crank 120 are respectively disposed on both sides of the eccentric block 130, and the main shaft 110 and the eccentric block 130 are welded and fixed. The crank 120 and the eccentric block 130 are welded and fixed.

The crank 120 and the main shaft 110 can be obtained by stamping a steel plate, seamless steel pipe sheet metal or spinning, and it is preferable to use a precision seamless steel pipe with good precision and surface roughness. The eccentric block 130 can be stamped from a steel plate of a standard thickness. Since the precision seamless steel pipe and steel plate are standardized products, the size and shape accuracy are high, and the rough machining process can be omitted compared with the casting crankshaft.

It can be understood that, as shown in FIG. 1 , the crank 120 can be a hollow structure, and the crank oil supply passage 102 can be formed in the crank 120; the main shaft 110 can be a hollow structure, and the main shaft oil supply passage 101 can be formed in the main shaft 110. Since the main shaft 110 and the crank 120 can be made of a hollow steel pipe, the comparatively cast crankshaft can eliminate the step of processing the oil supply passage, making the processing easy.

Advantageously, as shown in FIGS. 1 and 4, the eccentric block 130 is provided with an eccentric block oil hole 104 connecting the inside of the crankshaft 100, that is, the eccentric block oil hole 104 can communicate with the main shaft oil supply passage 101 and the crank oil supply passage 102. Alternatively, the eccentric block oil hole 104 has a hole diameter of not less than 2 mm.

In addition, the main shaft 110 and the crank 120 are made of hollow steel pipe. Compared with the cast crankshaft, the quality is greatly reduced, and the material and manufacturing cost are reduced. Moreover, the eccentricity of the crankshaft 100 can be adjusted by adjusting the diameter of the pipe, the welding tool of the crankshaft 100, and the like. The reciprocating compressor of a variety of displacements meets the process requirements of the crankshaft 100, thereby saving the mold opening cost of the crankshaft 100 and speeding up the development of the product.

According to the crankshaft 100 for a reciprocating compressor according to an embodiment of the present invention, the main shaft 110, the crank 120, and the eccentric block 130 are separate components, and the main shaft 110 and the crank 120 are respectively fixed to both sides of the eccentric block 130 by welding. Therefore, the crankshaft 100 is simple in molding and easy to process. Additionally, since the main shaft 110 and the crank 120 are made of a hollow steel pipe, the mass of the crankshaft 100 is light, at least to some extent, reducing the power of the reciprocating compressor during operation, and improving the reliability of the reciprocating compressor.

In addition, since the crankshaft 100 of the present invention is processed by welding, the conventional crankshaft is cast-formed, and the environment is basically free from pollution and the energy consumption is lower.

In some embodiments of the present invention, as shown in FIG. 2 and FIG. 3, the one end of the spindle 110 that is closer to the eccentric block 130 is provided with a spindle flange welding portion 111, and the end of the crankshaft 100 that is closer to the eccentric block 130 is disposed. There is a crank flange welding portion 121. The setting of the flange can increase the welding area, so that the spindle flange welding portion 111 can make the spindle 110 more easily welded to the eccentric block 130. Similarly, the crank flange welding portion 121 can make the crank 120 more easily welded to the eccentric block 130. on.

Further, the main shaft flange welding portion 111 is annular and orthogonal to the axial direction of the main shaft 110, and the width of the main shaft flange welding portion 111 is not less than 2 mm; the crank flange welding portion 121 is annular and orthogonal to the axial direction of the crank 120. The width of the crank flange welding portion 121 is not less than 2 mm. Thereby, the main shaft 110 and the crank 120 can be more firmly welded to both sides of the eccentric block 130.

The main shaft 110 and the crank 120 can be made by dividing the precision seamless steel pipe into a size that meets the design requirements, and then the end of the pipe is formed by cold forming of sheet metal, stamping, etc., and is pressed into a spindle of not less than 2 mm width. The flange welding portion 111 and the crank flange welding portion 121 increase the rigidity of the crankshaft 100 and increase the weld strength.

In some embodiments of the invention, as shown in FIG. 4, the eccentric mass 130 has a major axis side that faces the main shaft 110. The side surface 105 and the crank side surface 106 facing the crank 120 are provided with a spindle side positioning recess 131 for positioning the spindle flange welding portion 111, and the crank side surface 106 is provided with a flange for the crank flange. 121 The crank side positioning recess 132 that is positioned. Thereby, the main shaft 110 and the crank 120 can be quickly fixed on the eccentric block 130, the welding of the main shaft 110 and the crank 120 can be facilitated, and the welding efficiency of the main shaft 110 and the crank 120 can be improved.

It can be known that the crank 120, the main shaft 110 and the eccentric block 130 need to be fixed together by welding, so the three parts need to use low carbon steel, medium carbon steel or the like with excellent welding performance and good pulling performance. Alloy steel prevents cracking during sheet metal stamping, cracks and bubbles during welding, affecting the stiffness of the crankshaft 100 and weld strength. At the same time, in order to ensure the rigidity of the crankshaft 100, it is preferable to use high-quality steel having less impurities such as sulfur and phosphorus.

In some embodiments of the present invention, as shown in FIGS. 2 and 3, the main shaft 110 is provided with at least one spindle oil hole 107, and the crank 120 is provided with at least one crank oil hole 108. The lubricating oil in the oil passage of the crankshaft 100 can flow out through the spindle oil hole 107 and the crank oil hole 108, lubricate the surface of each friction pair, and increase the wear resistance of the crank 120, the main shaft 110, and the like.

The welding method between the main shaft 110 and the eccentric block 130, the crank 120 and the eccentric block 130 may be argon arc welding, laser welding, electric resistance welding or the like. Laser welding is preferred because of the high speed and energy concentration of the laser welding, the high aspect ratio of the weld, the high precision, and the small influence of the thermal deformation, which can minimize the deformation of the part caused by the welding temperature rise, thereby improving the crankshaft 100. The precision, the step of roughing is omitted, and the surface finishing of the crankshaft 100 is directly performed to reduce the manufacturing cost.

Moreover, the crankshaft 100 is composed of a crank 120, a main shaft 110 and a crank 120. The eccentricity of the crankshaft 100, the main shaft 110 and the outer diameter of the crank 120 can be flexibly adjusted by adjusting the welding positioning tool of the crankshaft 100, and the reciprocation of different displacements can be adapted. The requirements of the piston compressor are to save the mold opening cost of the crankshaft 100 and speed up the development of new products.

In some embodiments of the present invention, the crank 120 and the main shaft 110 are made of high quality medium and low carbon seamless steel tubes. Due to the low carbon content of the medium and low carbon steels, the surface hardness of the materials is low and the wear resistance is poor. After the completion of the welding of the crankshaft 100, the surface strengthening treatment process, such as carburizing, nitriding, carbonitriding, etc., can be used to improve the hardness and wear resistance of the outer surface of the crankshaft 100, thereby improving the reliability of the compressor during operation.

A reciprocating compressor according to an embodiment of the present invention will be briefly described below.

The reciprocating compressor according to the embodiment of the present invention includes the crankshaft 100 in the above embodiment, and since the reciprocating compressor according to the embodiment of the present invention is provided with the above-described crankshaft 100, the reciprocating compressor is simple in molding, easy to process, and compressed. The power during operation of the machine is reduced and the reliability of the compressor is improved.

In the description of the present specification, reference is made to the terms "one embodiment", "some embodiments", "example", "specific" The description of the examples, or "some examples", and the like, is intended to mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the invention. The singular representations of the present invention are not necessarily to be construed as being limited to the embodiments or examples. The specific features, structures, materials, or characteristics described may be combined in any suitable embodiment or example. Different embodiments or examples described in this specification can be joined and combined by those skilled in the art.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A crankshaft for a reciprocating compressor, comprising: a main shaft, a crank and an eccentric block, the main shaft and the crank are respectively disposed at two sides of the eccentric block, and the main shaft and the eccentricity The block and the crank and the eccentric block are respectively welded and fixed.
The crankshaft for a reciprocating compressor according to claim 1, wherein an end of the main shaft that is closer to the eccentric block is provided with a main shaft flange welding portion, and the distance of the crank is the eccentric block A cranked flange weld is provided at a proximal end.
A crankshaft for a reciprocating compressor according to claim 2, wherein said main shaft flange welded portion is annular and orthogonal to an axial direction of said main shaft, and said main shaft flange welded portion has a width not Less than 2mm;

The crank flange welding portion is annular and orthogonal to an axial direction of the crank, and the crank flange welding portion has a width of not less than 2 mm.
A crankshaft for a reciprocating compressor according to claim 2, wherein said eccentric block has a main shaft side surface toward said main shaft and a crank side side facing said crank, said main shaft side side being disposed There is a spindle side positioning recess for positioning the spindle flange welding portion, and the crank side surface is provided with a crank side positioning recess for positioning the crank flange welding portion.
A crankshaft for a reciprocating compressor according to claim 1, wherein said main shaft, said crank and said eccentric mass are made of low carbon steel, medium carbon steel or alloy steel.
A crankshaft for a reciprocating compressor according to claim 1, wherein said eccentric block is provided with an eccentric block oil hole communicating with the inside of the crankshaft.
The crankshaft for a reciprocating compressor according to claim 6, wherein the eccentric block oil hole has a diameter of not less than 2 mm.
A crankshaft for a reciprocating compressor according to claim 1, wherein said main shaft is provided with at least one spindle oil hole, and said crank is provided with at least one crank oil hole.
A crankshaft for a reciprocating compressor according to claim 1, wherein an outer surface of said main shaft is provided with a carburized layer, a nitrided layer, a soft nitriding layer or a carbonitrided layer; said crank The outer surface is provided with a carburized layer, a nitrided layer, a soft nitride layer or a carbonitrided layer.
A reciprocating compressor comprising the crankshaft of any of claims 1-9.