A two-stage compressor

Abstract

The present invention discloses a two-stage compressor, which comprises a primary compressor for compressing gas once and a secondary compressor connected to the primary compressor for secondary compression of the gas compressed by the primary compressor; further comprising a cooling device for cooling the primary compressor and the secondary compressor; the primary compressor is a swing type low pressure cylinder, and the secondary compressor is a piston type high pressure cylinder. The compressor provided by the present invention meets the exhaust pressure and displacement, while reducing the cost of the compressor and improving the working mode of the compressor.

Description

Technical Field

[0001] The invention relates to the field of compressors, and in particular to a two-stage compressor. Background Art

[0002] A compressor is a driven fluid machine that boosts low-pressure gas to high-pressure gas. It is currently widely used in industry and vehicle manufacturing.

[0003] The ratio of the exhaust pressure to the intake pressure of the compressor is called the pressure ratio. The pressure ratio of a single-stage compressor is usually small and the displacement is small, which cannot meet the needs of many industrial occasions. A single-stage compressor with a large pressure ratio has low working efficiency and the temperature of the piston part is prone to be too high during the compression process, affecting normal work and service life. Multi-stage compressors are used in many occasions to improve work efficiency and reduce exhaust temperature. Currently, a multi-stage piston compressor is more common. Each compression stage uses a piston compressor with a higher exhaust pressure and a displacement that can meet the needs of most industrial occasions. However, the piston compressor has a guide ring and a needle bearing connecting the piston pin. The cost of these components is relatively high, and they also need to be lubricated with high-temperature resistant grease, which makes the manufacturing cost and operating cost higher.

[0004] Therefore, how to reduce the cost of the compressor while ensuring the exhaust pressure of the compressor becomes a technical problem that needs to be solved by those skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a two-stage compressor which has low manufacturing and use costs.

[0006] To achieve the above object, the present invention provides a two-stage compressor, comprising a primary compressor for primary compression of gas and a secondary compressor connected to the primary compressor for secondary compression of the gas compressed by the primary compressor; and also comprising a cooling device for cooling the primary compressor and the secondary compressor;

[0007] The first-stage compressor is a swing-type low-pressure cylinder, and the second-stage compressor is a piston-type high-pressure cylinder.

[0008] Preferably, the low-pressure air outlet of the first-stage compressor and the high-pressure air inlet of the second-stage compressor are connected via a cooling pipe, and the cooling device is arranged between the first-stage compressor, the second-stage compressor and the cooling pipe, so that the cooling device can cool the three.

[0009] Preferably, the cooling device is a cooling fan, and there are multiple cooling fans, and the air outlets of the multiple cooling fans are respectively arranged toward the first-stage compressor, the second-stage compressor and the cooling pipe.

[0010] Preferably, it further comprises the first eccentric wheel provided between the two primary compressors for driving the two primary compressors and the second eccentric wheel provided between another primary compressor and one secondary compressor for driving another primary compressor and one secondary compressor;

[0011] The first eccentric wheel and the second eccentric wheel are used to connect to a power device to drive the first-stage compressor and the second-stage compressor to compress gas.

[0012] Preferably, it further comprises a filter arranged at the air inlet, wherein the filter is arranged between the air inlet and the low-pressure air inlet.

[0013] Preferably, the first-stage compressor comprises a low-pressure connecting rod assembly connected to the first eccentric wheel or the second eccentric wheel, and the low-pressure connecting rod assembly is also connected to a low-pressure intake valve plate and a low-pressure outlet valve plate for respectively controlling the intake and exhaust of the first-stage compressor.

[0014] Preferably, the secondary compressor comprises a high-pressure connecting rod assembly connected to the second eccentric wheel, and the high-pressure connecting rod assembly is also connected to a high-pressure intake valve plate and a high-pressure exhaust valve plate for respectively controlling the intake and exhaust of the secondary compressor.

[0015] Compared with the above background technology, the two-stage compressor provided by the present invention includes a first-stage compressor for compressing gas once and a second-stage compressor connected to the first-stage compressor for secondary compression of the gas compressed by the first-stage compressor, and also includes a cooling device for cooling the first-stage compressor and the second-stage compressor; wherein the first-stage compressor adopts a swinging low-pressure cylinder, and the second-stage compressor adopts a piston-type high-pressure cylinder; the gas pressure can reach 0.3~0.4MPa after compression by the swinging low-pressure cylinder, and the gas pressure can reach 1.2MPa after compression by the piston-type high-pressure cylinder. The first-stage piston cylinder adopts a swinging low-pressure cylinder, and the piston movement is driven by the eccentric swing of the leather cup connecting the connecting rod assembly to achieve gas compression. Compared with the ordinary piston-type low-pressure cylinder, the guide ring, high-pressure piston pin and needle bearing connection are omitted, the use of high-temperature resistant grease is reduced, and the manufacturing and use costs of the second-stage compression cylinder are greatly reduced. At the same time, a two-stage compressor is adopted instead of more stages, and the structure is relatively simple. The oil cooling of the first-stage compressor and the second-stage compressor is replaced by a cooling device such as a fan instead of high-temperature resistant grease, which also reduces the use of high-temperature resistant grease and reduces the cost of the second-stage compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0017] Figure 1 A schematic structural diagram of a two-stage compressor provided in an embodiment of the present invention.

[0018] in:

[0019] 1-first stage compressor, 2-second stage compressor, 3-air inlet, 4-low-pressure air inlet, 6-filter, 7-inlet diaphragm, 8-low-pressure air outlet, 9-bearing, 10-first eccentric wheel, 11-low-pressure connecting rod assembly, 12-low-pressure air inlet valve plate, 13-low-pressure air outlet valve plate, 14-low-pressure limit plate, 15-cooling device, 16-high-pressure air inlet, 17-air outlet, 18-high-pressure limit plate, 19-high-pressure air outlet valve plate, 20-high-pressure air inlet valve plate, 21-high-pressure piston assembly, 22-high-pressure piston pin, 23-high-pressure connecting rod assembly, 24-second eccentric wheel. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a two-stage compressor provided in an embodiment of the present invention.

[0023] The two-stage compressor 2 provided by the present invention includes a primary compressor 1 for once compressing gas and a secondary compressor 2 connected to the primary compressor 1 for re-compressing the gas compressed by the primary compressor 1. Through two-stage compression, the pressure ratio of any single-stage compressor is reduced, thereby reducing the exhaust temperature, meeting the needs of most industrial occasions, and improving mechanical efficiency. Among them, the primary compressor 1 specifically adopts a swinging low-pressure cylinder, and the secondary compressor 2 adopts a piston-type high-pressure cylinder, and also includes a cooling device 15 for cooling the primary compressor 1 and the secondary compressor 2. The so-called swinging low-pressure cylinder swing omits the guide ring and the piston pin, and the needle bearing 9 connecting the piston pin is connected compared to the piston type, reducing the high-temperature resistant grease, which are relatively high-cost accessories. Instead, the primary compressor 1 and the secondary compressor 2 are cooled by a swinging leather cup seal and a cooling device 15, which reduces the exhaust temperature, improves the compression efficiency, and thus reduces the cost of the compressor.

[0024] After being compressed by the swing-type low-pressure cylinder, the gas pressure can reach 0.3~0.4MPa, and after being compressed by the piston-type high-pressure cylinder, the gas pressure can reach 1.2MPa. While meeting the needs of most industrial occasions, the cost of the compressor is reduced by adopting the swing-type low-pressure cylinder. The details of the swing-type low-pressure cylinder and the piston-type high-pressure cylinder can refer to the prior art. A core of the present invention is that the compressor is designed as a two-stage compressor and the types and overall layout of the compressors at each stage are reasonably set. The compressors at each stage are cooled by the cooling device 15, which improves the reliability and service life of the compressor and reduces the manufacturing and use costs of the compressor.

[0025] The structure of the two-stage compressor provided by the present invention is as follows: Figure 1 As shown, the two-stage compressor is specifically a four-cylinder two-stage compressor, including three one-stage compressors 1 and one two-stage compressor 2, and the four compressors are symmetrically arranged in pairs; the so-called two-stage symmetrical arrangement is specifically: two one-stage compressors 1 are arranged opposite to each other with the low-pressure air inlet 4, and another one-stage compressor 1 and a two-stage compressor 2 are symmetrically arranged with the above two one-stage compressors 1, and the four compressors form a rectangle and are arranged at the four corners of the rectangle; it also includes a cooling pipe connecting the low-pressure air outlet 8 and the high-pressure air inlet 16, and the cooling device 15 is arranged between the one-stage compressor 1, the two-stage compressor 2 and the cooling pipe, so as to realize cooling of the three, reduce the exhaust temperature, increase the overall service life of the compressor, reduce the use of high-temperature resistant grease, and reduce the use cost.

[0026] The so-called first-stage compressor 1 is also called a low-pressure compressor, which uses a swing-type low-pressure cylinder, and the so-called second-stage compressor 2 is also called a high-pressure compressor, which uses a piston-type high-pressure cylinder. The low pressure and high pressure mentioned here are relative concepts, and there is no specific numerical regulation; the exhaust pressure of the first-stage compressor 1 that compresses the gas once is lower than the exhaust pressure of the second-stage compressor 2 that compresses the gas twice, so it is called a low-pressure compressor.

[0027] In a specific embodiment provided by the present invention, the cooling device 15 is specifically a cooling fan, and there are multiple cooling fans, and the air outlets of the multiple cooling fans are respectively directed toward the first-stage compressor 1, the second-stage compressor 2 and the cooling pipe, thereby cooling the three, effectively reducing the exhaust temperature, improving the compression efficiency and service life of the two-stage compressor, and reducing the use cost of the compressor.

[0028] A first eccentric wheel 10 for driving the movement of the two first compressors is provided between the first-stage compressors 1 with two low-pressure air inlets 4 arranged opposite to each other, and a second eccentric wheel 24 for driving the remaining other first-stage compressor 1 and a second-stage compressor 2 is provided between the two. The first eccentric wheel 10 and the second eccentric wheel 24 are used to connect to power equipment to drive the first-stage compressor 1 and the second-stage compressor 2 to work and compress the gas.

[0029] In order to ensure the quality of intake air, reduce impurities in the primary compressor 1 and the secondary compressor 2, and thus reduce the wear of the piston, a filter 6 is also provided at the air inlet 3 of the two-stage compressor. The filter 6 is specifically arranged between the air inlet 3 and the low-pressure air inlet 4. An intake diaphragm 7 is also arranged after the filter 6, so as to ensure the quality of the gas entering the primary compressor 1, i.e. the low-pressure compressor, and prevent impurities from entering the cylinder. The low-pressure air inlets 4 of the two primary compressors 1 that are relatively arranged with low-pressure air inlets 4 are directly connected to the air inlet 3 through the shell, and the low-pressure air inlet 4 of the other primary compressor 1 is connected to the air inlet 3 through the first cooling pipe to achieve air intake; the low-pressure air outlet 8 is connected to the high-pressure air inlet 16 of the secondary compressor 2 through the second cooling pipe, and is discharged from the air outlet 17 after being compressed by the secondary compressor 2.

[0030] The above-mentioned first-stage compressor 1 specifically includes a low-pressure connecting rod assembly 11 connected to the first eccentric wheel 10 or the second eccentric wheel 24, wherein the low-pressure connecting rod assembly 11 of the first-stage compressor 1 with two low-pressure air inlets 4 arranged opposite to each other is connected to the first eccentric wheel 10, and the low-pressure connecting rod assembly 11 of the other first-stage compressor 1 is connected to the second eccentric wheel 24, and the low-pressure connecting rod assembly 11 is used to control the low-pressure air inlet valve plate 12 and the low-pressure air outlet valve to respectively realize the air intake and exhaust after compression of the first-stage compressor 1. Specifically, when the low-pressure connecting rod assembly 11 and its related components move downward, the low-pressure air inlet valve plate 12 opens, and the air flows through the air inlet filter 6 and the low-pressure air inlet 4 into the cavity of the first-stage compressor 1; when the low-pressure connecting rod assembly 11 and its related components move upward, the leather cup moves with the low-pressure connecting rod assembly 11 to keep the piston sealed, the piston moves downward to realize the compression of the gas, the low-pressure air outlet valve plate 13 opens, and the gas is discharged from the first-stage compressor 1.

[0031] The above-mentioned secondary compressor 2 specifically includes a high-pressure connecting rod assembly 23 connected to the second eccentric wheel. The high-pressure connecting rod assembly 23 is used to control the high-pressure intake valve plate 20 and the high-pressure outlet valve to realize the intake and exhaust after compression of the secondary compressor 2. Specifically, driven by the second eccentric wheel, when the high-pressure connecting rod assembly 23 and its related components move downward, the high-pressure intake valve plate 20 opens, and the airflow enters the cavity of the secondary compressor 2 from the low-pressure exhaust port through the cooling pipe. Because the high-pressure intake valve plate 20 and the high-pressure outlet valve plate 19 are both arranged above and below the valve plate position of the shell component, when the high-pressure connecting rod assembly 23 and its related components move downward, the high-pressure piston assembly 21 is driven to move downward, the high-pressure intake valve plate 20 opens, and the airflow enters the cavity of the secondary compressor 2. When the high-pressure connecting rod assembly 23 and its related components move upward, the high-pressure piston assembly 21 is driven to move upward, and the high-pressure outlet valve plate 19 opens to complete the second compression of the gas and discharge it from the two-stage compressor through the outlet 17. Figure 1 As shown, the direction of the arrow in the cooling pipe indicates the flow direction of the compressed gas, and the arrow at the cooling device 15 indicates the direction of the cooling wind.

[0032] The first-stage compressor 1 is also provided with a low-pressure limit plate 14 for limiting the movement of the low-pressure connecting rod assembly 11, and the second-stage compressor 2 is provided with a high-pressure limit plate 18 for limiting the movement of the high-pressure connecting rod assembly 23. The first eccentric wheel 10 and the second eccentric wheel as well as the low-pressure connecting rod assembly 11 and the high-pressure connecting rod assembly 23 are arranged in the two-stage compressor through a certain bearing 9, the low-pressure piston cylinder is connected to the low-pressure connecting rod assembly 11 through a leather cup, and the high-pressure piston cylinder is connected to the high-pressure piston cylinder through a high-pressure piston pin 22. Other specific structures can refer to the prior art.

[0033] The two-stage compressor 2 provided by the present invention sets the compressor as a two-stage compressor, and selects a swinging low-pressure cylinder as the first-stage compressor 1. The swinging low-pressure cylinder uses a leather cup seal to drive the movement of the low-pressure piston, reducing expensive components such as piston rings and needle bearings 9, thereby reducing the cost of the first-stage compressor 1 and the overall two-stage compressor; by setting a cooling pipe between the two first-stage compressors 1 and the second-stage compressor 2 and cooling the first-stage compressor 1, the second-stage compressor 2 and the cooling pipe through a cooling device 15, the exhaust temperature is reduced and the compression efficiency is improved; on the other hand, the use of high-temperature resistant grease is reduced, thereby reducing the use cost of the two-stage compressor.

[0034] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0035] The two-stage compressor provided by the present invention is introduced in detail above. The principle and implementation mode of the present invention are explained in this article by using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A two-stage compressor, characterized in that: It comprises a primary compressor (1) for performing primary compression on gas and a secondary compressor (2) connected to the primary compressor (1) and for performing secondary compression on the gas compressed by the primary compressor (1); and it also comprises a cooling device (15) for cooling the primary compressor (1) and the secondary compressor (2); The first-stage compressor (1) is a swing-type low-pressure cylinder, and the second-stage compressor (2) is a piston-type high-pressure cylinder; The low-pressure air outlet (8) of the first-stage compressor (1) and the high-pressure air inlet (16) of the second-stage compressor (2) are connected via a second cooling pipeline, and the cooling device (15) is arranged between the first-stage compressor (1), the second-stage compressor (2) and the second cooling pipeline, so that the cooling device (15) can cool the three. The cooling device (15) is a cooling fan, and there are a plurality of cooling fans, and the air outlets of the plurality of cooling fans are respectively arranged toward the first-stage compressor (1), the second-stage compressor (2), and the second cooling pipeline; There are three first-stage compressors (1) and one second-stage compressor (2); the three first-stage compressors (1) and the one second-stage compressor (2) are symmetrically arranged in pairs, the low-pressure air inlets (4) of the two first-stage compressors (1) that are arranged opposite to each other are connected to the air inlet (3) through a shell, and the low-pressure air inlet (4) of the other first-stage compressor (1) is connected to the air inlet (3) through a first cooling pipe to achieve air intake; The three first-stage compressors (1) and the second-stage compressor (2) form a rectangle and are arranged at the four corners of the rectangle; It also includes a first eccentric wheel (10) provided between the two primary compressors (1) for driving the two primary compressors (1), and a second eccentric wheel (24) provided between another primary compressor (1) and one secondary compressor (2) for driving another primary compressor (1) and one secondary compressor (2); The first eccentric wheel (10) and the second eccentric wheel (24) are used to connect to a power device to drive the first-stage compressor (1) and the second-stage compressor (2) to compress gas; It also includes a filter (6) arranged at the air inlet (3), wherein the filter (6) is arranged between the air inlet (3) and the low-pressure air inlet (4); An air intake diaphragm (7) is also provided on one side of the filter (6) to prevent impurities from entering the cylinder of the first-stage compressor (1); The first-stage compressor (1) comprises a low-pressure connecting rod assembly (11) connected to the first eccentric wheel (10) or the second eccentric wheel (24), and the low-pressure connecting rod assembly (11) is also connected to a low-pressure intake valve plate (12) and a low-pressure outlet valve plate (13) for respectively controlling intake and exhaust of the first-stage compressor (1); The low-pressure connecting rod assembly (11) of the first-stage compressor (1) with two low-pressure air inlets (4) arranged opposite to each other is connected to the first eccentric wheel (10), and the low-pressure connecting rod assembly (11) of another first-stage compressor (1) is connected to the second eccentric wheel (24); When the low-pressure connecting rod assembly (11) and its related components move downward, the low-pressure air intake valve plate (12) opens, and air flows through the air intake hole, the filter (6) and the low-pressure air intake port (4) into the cavity of the first-stage compressor (1); When the low-pressure connecting rod assembly (11) and its related components move upward, the leather cup moves with the low-pressure connecting rod assembly (11) to maintain the sealing of the piston, the piston moves downward to achieve gas compression, the low-pressure outlet valve plate (13) opens, and the gas is discharged from the first-stage compressor (1); The two-stage compressor (2) comprises a high-pressure connecting rod assembly (23) connected to the second eccentric wheel (24), and the high-pressure connecting rod assembly (23) is also connected to a high-pressure intake valve plate (20) and a high-pressure outlet valve plate (19) for respectively controlling intake and exhaust of the two-stage compressor (2); When the high-pressure connecting rod assembly (23) and its related components move downward, the high-pressure piston assembly (21) is driven to move downward, the high-pressure intake valve plate (20) opens, and air flows into the cavity of the secondary compressor (2); When the high-pressure connecting rod assembly (23) and its related components move upward, the high-pressure piston assembly (21) is driven to move upward, and the high-pressure outlet valve plate (19) opens to complete the second compression of the gas and discharge it from the two-stage compressor through the outlet port (17).

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