Compressor assembly and compressor system

Abstract

The invention provides a compressor assembly and a compressor system. The compressor assembly comprises a compression part; a driving structure; the speed change structure comprises at least two gear sets; and a moving structure. According to the compressor assembly and the compressor system, the driving structure and the compression component are in transmission connection through the gear sets with different transmission ratios, the purpose that the compression component works at different rotating speeds is achieved by switching the different gear sets, a frequency converter does not need to be used, and the problem of electronic component faults cannot occur; and the problems of starting impact and the like caused by the existence of the frequency converter can be avoided, the cost of the compressor is reduced, the design and the manufacturing are relatively easy, parts are convenient to maintain and replace, and the reliability of the compressor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compression equipment, in particular to a compressor component and a compressor system. Background Art

[0002] Using a frequency converter to control the speed of a screw compressor is a common energy-saving measure. By adjusting the speed of the compressor to adapt to the actual required cooling or heating, energy conservation can be achieved. However, in actual applications, frequency converters are prone to electronic failures, and the compressor may generate a large current shock when starting, especially when starting at a low frequency, which can easily cause mechanical shock to the motor and compressor, affecting the reliability and service life of the equipment. In addition, the cost of a screw compressor controlled by a frequency converter is relatively high, including the cost of the frequency converter itself, as well as the cost of installation, commissioning and maintenance. For some small projects, the increase in costs may reduce the economic benefits of the project. In addition, the frequency conversion control system is relatively complex, and the technical requirements for maintenance personnel are high. Once a failure occurs, the difficulty of repair is relatively large. Summary of the invention

[0003] In order to solve the technical problems of poor reliability, high cost and great maintenance difficulty existing in the compressor controlled by the inverter in the prior art, a compressor assembly and a compressor system are provided which use gear sets with different transmission ratios for adjustment to improve the reliability of the compressor, reduce the cost and the difficulty of maintenance.

[0004] A compressor assembly, comprising:

[0005] Compression components;

[0006] A driving structure connected to the compression component via a speed change structure;

[0007] The speed change structure comprises:

[0008] At least two gear sets, all of which have different transmission ratios, and at most one gear set is working at the same time;

[0009] The gear set comprises an input gear and an output gear meshing with each other, and the input gears of all the gear sets are connected to the driving structure;

[0010] A moving structure, wherein the moving structure is movably arranged on the compression component, the output gears of all the gear sets are arranged on the moving structure, and the moving structure can drive all the output gears to move so that the output gears are meshed with the corresponding input gears.

[0011] The compressor assembly further includes a control structure, which can obtain the suction pressure and the discharge pressure of the compressor, and the control structure can control the movement of the moving structure according to the suction pressure and the discharge pressure.

[0012] The control structure includes a pressure difference detection mechanism and a synchronizer. The pressure difference detection mechanism is connected to the intake port and the exhaust port of the compressor assembly. The pressure difference detection mechanism can obtain the pressure difference between the intake port and the exhaust port, and the movable parts in the pressure difference detection mechanism can move according to the pressure difference. The movable structure is connected to the movable parts through the synchronizer.

[0013] The pressure difference detection mechanism includes a piston cylinder and a piston, wherein the piston is movably arranged in the piston cylinder, and the piston divides the interior of the piston cylinder into a first pressure chamber and a second pressure chamber, the first pressure chamber is connected to the suction port of the compressor assembly, and the second pressure chamber is connected to the exhaust port of the compressor assembly, and the piston constitutes the movable part.

[0014] The speed change structure further comprises an input shaft and a driven gear, the driven gear and the input gears of all the gear sets are arranged on the input shaft, and the driven gear is meshed with the driving structure.

[0015] The speed change structure further includes an intermediate shaft and at least two intermediate gears, and the input gear and the output gear in each gear set are matched through the corresponding intermediate gears.

[0016] The compression component includes a male rotor and a female rotor, the male rotor and the female rotor are meshed with each other, and the male rotor is connected to the driving structure through the speed change structure; or the female rotor is connected to the driving structure through the speed change structure.

[0017] The driving structure is a fixed frequency motor.

[0018] The compressor assembly further comprises:

[0019] a housing, wherein the speed change structure and the compression component are both disposed in the housing;

[0020] The air intake end cover is arranged on the shell, and the air intake end cover is communicated with the inside of the shell, and the driving structure is arranged in the air intake end cover.

[0021] A compressor system comprises the above-mentioned compressor assembly.

[0022] The compressor assembly and compressor system provided by the present invention utilize gear sets with different transmission ratios to connect the drive structure and the compression component, and achieve the purpose of making the compression component work at different speeds by switching different gear sets. There is no need to use a frequency converter and no electronic failure problems will occur. Problems such as starting impact due to the presence of the frequency converter can also be avoided, thereby reducing the cost of the compressor. The design and manufacturing are relatively easy, and maintenance and replacement of parts are also relatively convenient, thereby improving the reliability of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a compressor assembly provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the structure of a speed change structure provided by an embodiment of the present invention;

[0025] In the figure:

[0026] 1. Compression component; 2. Driving structure; 31. Input gear; 32. Output gear; 4. Moving structure; 51. Synchronizer; 52. Piston cylinder; 53. Piston; 54. Input shaft; 55. Driven gear; 11. Male rotor; 12. Female rotor; 6. Housing; 7. Intake end cover. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" 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 direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Using a frequency converter to control the speed of a screw compressor is a common energy-saving measure. By adjusting the speed of the compressor to adapt to the actual required cooling or heating, energy conservation can be achieved. However, in actual applications, frequency converters are prone to electronic failures, and the compressor may generate a large current shock when starting, especially when starting at a low frequency, which can easily cause mechanical shock to the motor and compressor, affecting the reliability and service life of the equipment. In addition, the cost of a screw compressor controlled by a frequency converter is relatively high, including the cost of the frequency converter itself, as well as the cost of installation, commissioning and maintenance. For some small projects, the increase in costs may reduce the economic benefits of the project. In addition, the frequency conversion control system is relatively complex, and the technical requirements for maintenance personnel are high. Once a failure occurs, the difficulty of repair is relatively large.

[0033] To this end, the present application provides a Figure 1 and Figure 2The compressor assembly shown includes: a compression component 1; a driving structure 2, wherein the driving structure 2 is connected to the compression component 1 through a speed change structure; the speed change structure includes: at least two groups of gear sets, all of which have different transmission ratios, and at most one group of gear sets is working at the same time; the gear sets include input gears 31 and output gears 32 that are meshed with each other, and the input gears 31 of all the gear sets are connected to the driving structure 2; a moving structure 4, wherein the moving structure 4 is movably arranged on the compression component 1, and the output gears 32 of all the gear sets are arranged on the moving structure 4, and the moving structure 4 can drive all the output gears 32 to move so that the output gears 32 are meshed with the corresponding input gears 31. By using gear sets with different transmission ratios to drive the drive structure 2 and the compression component 1, the purpose of the compression component 1 working at different speeds can be achieved by switching different gear sets. There is no need to use a frequency converter and no electronic failure will occur. It can also avoid problems such as starting impact due to the existence of the frequency converter, reduce the cost of the compressor, and is relatively easy to design and manufacture. It is also relatively convenient to maintain and replace parts, which improves the reliability of the compressor. The mobile structure 4 can rotate together with the output gear 32, and the mobile structure 4 can always maintain a connection with the compression component 1, ensuring that the power output by the drive structure 2 can be transmitted to the compression component 1 through any gear set, thereby ensuring the normal operation of the compression component 1 and ensuring the reliable compression of the compressor assembly.

[0034] Optionally, the movable structure 4 is a sleeve structure, which is sleeved on the rotating shaft of the compression component 1 , and the moving direction of the movable structure 4 is the same as the axial direction of the rotating shaft of the compression component 1 .

[0035] When the compressor controlled by the inverter adjusts the speed of the compression component 1, it only relies on the inverter to change the frequency of the motor working power supply to adjust the speed. The adjustment accuracy of the compressor is not high, which will cause the compressor to start and stop frequently, not only wasting electricity, but also affecting the cooling or heating effect. For this reason, the compressor assembly also includes a control structure, which can obtain the suction pressure and exhaust pressure of the compressor, and the control structure can control the movement of the mobile structure 4 according to the suction pressure and exhaust pressure of the compressor. The suction pressure and exhaust pressure of the compressor are directly used to adjust the mobile structure 4, and then the mutually meshing gear sets can be adjusted, and then the transmission ratio from the drive structure 2 to the compression component 1 is adjusted to achieve the purpose of adjusting the speed of the compression component 1.

[0036] The control structure includes a pressure difference detection mechanism and a synchronizer 51. The pressure difference detection mechanism is connected to the air intake port and the air exhaust port of the compressor assembly. The pressure difference detection mechanism can obtain the pressure difference between the air intake port and the air exhaust port, and the movable parts in the pressure difference detection mechanism can move according to the pressure difference. The movable structure 4 is connected to the movable parts through the synchronizer 51. The pressure difference between the intake pressure and the exhaust pressure is directly obtained by the pressure difference detection mechanism, and the movement of the movable parts is driven according to the pressure difference, so as to avoid the problem of electronic failure during electrical signal detection and improve the reliability of the compressor assembly. In addition, there is a certain delay in electrical signal detection, which makes the adjustment of the compressor delayed during the adjustment process. The present application directly obtains the pressure difference for adjustment to ensure the real-time adjustment and the adjustment reliability of the compressor assembly. Figure 1 As shown, the synchronizer is a shift fork, the handle portion of the shift fork is connected to the movable component, and the head of the shift fork is connected to the moving structure, wherein the shift fork has two heads, and the two heads are respectively connected to different positions of the moving structure, thereby ensuring the purpose of reliable movement of the moving structure.

[0037] Specifically, the pressure difference detection mechanism includes a piston cylinder 52 and a piston 53, wherein the piston 53 is movably arranged in the piston cylinder 52, and the piston 53 divides the interior of the piston cylinder 52 into a first pressure chamber and a second pressure chamber, wherein the first pressure chamber is connected to the air intake port of the compressor assembly, and the second pressure chamber is connected to the air exhaust port of the compressor assembly, and the piston 53 constitutes the movable component. The air intake of the compressor and the air exhaust of the compressor are directly directed to both sides of the piston 53, so that the compressor assembly can directly obtain the air intake pressure and the air exhaust pressure, thereby ensuring the real-time movement of the piston 53, and the movement of the piston 53 can drive the synchronizer 51 to move, thereby driving the moving structure 4 to move, so that all the output gears 32 have position changes, thereby realizing the meshing of different gear sets, thereby ensuring the self-regulation of the speed of the compression component 1.

[0038] The speed change structure further includes an input shaft 54 ​​and a driven gear 55. The driven gear 55 and the input gears 31 of all the gear sets are arranged on the input shaft 54, and the driven gear 55 is meshed with the drive structure 2. That is, all the input gears 31 are arranged in parallel in the axial direction of the input shaft 54, and the driven gear 55 is also arranged on the input shaft 54. The driving gear of the drive structure 2 and the driven gear 55 are meshed with each other, so that the rotation of the drive structure 2 can be transmitted to the input shaft 54 ​​through the driving gear and the driven gear 55, and then all the input gears 31 are rotated. At this time, only the moving mechanism needs to drive the output gears 32 to move, so that one of the input gears 31 is meshed with the corresponding output gear 32, and the power transmission can be completed.

[0039] Furthermore, the speed change structure further includes an intermediate shaft and at least two intermediate gears, and the input gear 31 and the output gear 32 in each gear set are matched through the corresponding intermediate gears. The intermediate gears are used to further increase the transmission ratio of the input gear 31 and the output gear 32, thereby improving the speed adjustment range of the compression component 1.

[0040] The compression component 1 includes a male rotor 11 and a female rotor 12, which are meshed with each other to achieve compression of the fluid, and the male rotor 11 is connected to the driving structure 2 through the speed change structure. At this time, the male rotor 11 serves as the active component of the compression component 1, and the female rotor 12 serves as the driven component of the compression component 1.

[0041] Alternatively, the female rotor 12 is connected to the driving structure 2 via the speed change structure. In this case, the female rotor 12 serves as an active component of the compression component 1 , and the male rotor 11 serves as a driven component of the compression component 1 .

[0042] Since a variable speed structure is provided, the drive structure 2 is a fixed frequency motor, and the drive structure 2 can always work at a set speed, which can further reduce the cost of the compressor assembly and avoid problems such as complex control and difficult maintenance caused by the use of a frequency converter.

[0043] The compressor assembly further comprises:

[0044] A housing 6, wherein the speed change structure and the compression component 1 are both disposed in the housing 6, a compression chamber is formed in the housing 6, and the compression component 1 compresses the fluid in the compression chamber;

[0045] The air intake end cover 7 is arranged on the shell 6, and the air intake end cover 7 is connected to the inside of the shell 6. The drive structure 2 is arranged in the air intake end cover 7. The air intake end cover 7 and the shell 6 are easy to disassemble, thereby facilitating the disassembly, assembly and maintenance of the drive structure 2 and the speed change structure, and further reducing the difficulty of repairing the compressor assembly.

[0046] A compressor system comprises the above-mentioned compressor assembly.

[0047] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A compressor assembly, characterized in that: include: Compression component (1); A driving structure (2), wherein the driving structure (2) is connected to the compression component (1) via a speed change structure; The speed change structure comprises: At least two gear sets, all of which have different transmission ratios, and at most one gear set is working at the same time; The gear set comprises an input gear (31) and an output gear (32) meshing with each other, and the input gears (31) of all the gear sets are connected to the driving structure (2); A moving structure (4), wherein the moving structure (4) is movably arranged on the compression component (1), and all the output gears (32) of the gear sets are arranged on the moving structure (4), and the moving structure (4) can drive all the output gears (32) to move so that the output gears (32) are meshed with the corresponding input gears (31).

2. The compressor assembly according to claim 1, characterized in that: The compressor assembly further comprises a control structure, wherein the control structure is capable of acquiring the suction pressure and the discharge pressure of the compressor, and the control structure is capable of controlling the movement of the moving structure (4) according to the suction pressure and the discharge pressure.

3. The compressor assembly according to claim 2, characterized in that: The control structure comprises a pressure difference detection mechanism and a synchronizer (51); the pressure difference detection mechanism is connected to both the air intake port and the air exhaust port of the compressor assembly; the pressure difference detection mechanism can obtain the pressure difference between the air intake port and the air exhaust port; and the movable part in the pressure difference detection mechanism can move according to the pressure difference; the movable structure (4) is connected to the movable part via the synchronizer (51).

4. The compressor assembly according to claim 3, characterized in that: The pressure difference detection mechanism includes a piston cylinder (52) and a piston (53), wherein the piston (53) is movably arranged in the piston cylinder (52), and the piston (53) divides the interior of the piston cylinder (52) into a first pressure chamber and a second pressure chamber, wherein the first pressure chamber is connected to the air intake port of the compressor assembly, and the second pressure chamber is connected to the air exhaust port of the compressor assembly, and the piston (53) constitutes the movable part.

5. The compressor assembly according to claim 1, characterized in that: The speed change structure further comprises an input shaft (54) and a driven gear (55); the driven gear (55) and the input gears (31) of all the gear sets are arranged on the input shaft (54); and the driven gear (55) is meshed with the driving structure (2).

6. The compressor assembly according to claim 1, characterized in that: The speed change structure also includes an intermediate shaft and at least two intermediate gears, and the input gear (31) and the output gear (32) in each gear set are matched through the corresponding intermediate gears.

7. The compressor assembly according to claim 1, characterized in that: The compression component (1) comprises a male rotor (11) and a female rotor (12), wherein the male rotor (11) and the female rotor (12) are meshed with each other, and the male rotor (11) is connected to the driving structure (2) via the speed change structure; or the female rotor (12) is connected to the driving structure (2) via the speed change structure.

8. The compressor assembly according to claim 1, characterized in that: The driving structure (2) is a fixed-frequency motor.

9. The compressor assembly according to claim 1, characterized in that: The compressor assembly further comprises: A housing (6), wherein the speed change structure and the compression component (1) are both arranged in the housing (6); An air intake end cover (7), wherein the air intake end cover (7) is arranged on the shell (6), and the air intake end cover (7) is communicated with the interior of the shell (6), and the driving structure (2) is arranged in the air intake end cover (7).

10. A compressor system, characterized in that: A compressor assembly comprising the compressor assembly of any one of claims 1 to 9.

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