Compressor assembly and compressor system

Abstract

The utility model 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 utility model relates to the technical field of compression equipment, especially a compressor assembly and a compressor system. BACKGROUND

[0002] It is a common energy-saving measure to control the rotating speed of a screw compressor by a frequency converter, and the actual required cooling capacity or heating capacity is adapted by adjusting the rotating speed of the compressor, so as to save energy. However, in actual application, the frequency converter is prone to electronic failure, and the compressor may generate a large current impact when starting, especially when starting at a low frequency, which is prone to mechanical impact on the motor and the compressor, affecting the reliability and service life of the equipment. Moreover, the cost of the screw compressor controlled by the frequency converter is relatively high, including the cost of the frequency converter itself, and the cost of installation, debugging and maintenance. For some small projects, the increase in cost may reduce the economic benefits of the project. In addition, the frequency control system is relatively complex, and the technical requirements for maintenance personnel are high. Once a fault occurs, the maintenance difficulty is also relatively large. SUMMARY

[0003] To solve the technical problems of poor reliability, high cost and large maintenance difficulty of the compressor controlled by the frequency converter in the prior art, a compressor assembly and a compressor system are provided, which use gear sets with different transmission ratios to adjust to improve the reliability of the compressor, reduce the cost and the maintenance difficulty.

[0004] A compressor assembly comprises:

[0005] a compression component;

[0006] a driving structure connected to the compression component through a variable speed structure;

[0007] the variable speed structure comprises:

[0008] at least two groups of gear sets, the transmission ratios of all the gear sets are different, and at most one group of the gear sets works 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 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 comprises a control structure, which is capable of obtaining the suction pressure and discharge pressure of the compressor, and the control structure is capable of controlling the moving structure to move according to the suction pressure and discharge pressure.

[0012] The control structure comprises a differential pressure detection mechanism and a synchronizer, the differential pressure detection mechanism is communicated with the suction port of the compressor assembly and the discharge port of the compressor assembly, the differential pressure detection mechanism is capable of obtaining the differential pressure of the suction port and the discharge port, and a movable component in the differential pressure detection mechanism is capable of moving according to the differential pressure, and the moving structure is connected with the movable component through the synchronizer.

[0013] The differential pressure detection mechanism comprises a piston cylinder and a piston, the piston is movably arranged in the piston cylinder, and the piston divides the interior of the piston cylinder into a first pressure cavity and a second pressure cavity, the first pressure cavity is communicated with the suction port of the compressor assembly, the second pressure cavity is communicated with the discharge port of the compressor assembly, and the piston constitutes the movable component.

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

[0015] The variable speed structure further comprises an intermediate shaft and at least two intermediate gears, the input gear and the output gear of each of the gear sets are drivingly connected through the corresponding intermediate gears.

[0016] The compression component comprises a male rotor and a female rotor, the male rotor and the female rotor are engaged with each other, and the male rotor is connected with the driving structure through the variable speed structure, or the female rotor is connected with the driving structure through the variable speed structure.

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

[0018] The compressor assembly further comprises:

[0019] A housing, the variable speed structure and the compression component are arranged in the housing;

[0020] A suction end cover, which is arranged on the housing and communicated with the interior of the housing, and the driving structure is arranged in the suction end cover.

[0021] A compressor system comprising the above compressor assembly.

[0022] The compressor assembly and the compressor system provided by the utility model have the advantages that the gear sets with different transmission ratios are used to drive the driving structure and the compression component, the compression component is driven to work at different rotating speeds by switching different gear sets, the problem of electronic component failure caused by the use of the frequency converter does not occur, the problem of start-up impact caused by the existence of the frequency converter is avoided, the cost of the compressor is reduced, the design and manufacturing are relatively easy, the maintenance and replacement of parts are relatively convenient, and the reliability of the compressor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The utility model provides a compressor assembly's structure schematic drawing for embodiment of the utility model;

[0024] Figure 2 The utility model provides a variable speed structure's structure schematic drawing for embodiment of the utility model;

[0025] In the drawing,

[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, shell;7, suction end cover. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further detailed to the utility model by combining with the drawings and examples. It should be understood that the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0028] In order to make the person in the art better understand the utility model scheme, the technical scheme in the embodiment of the utility model will be clearly and completely described below by combining with the drawings in the embodiment of the utility model. Obviously, the described examples are only a part of the embodiment of the utility model, not all the examples. Based on the examples in the utility model, all other examples obtained by the person skilled in the art without creative labor should belong to the protection scope of the utility model.

[0029] It should be noted that the terms "first", "second", and the like in the description of the utility model and claims and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, the process, method, system, product or equipment including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0030] It should be noted that in the description of the utility model, the terms "up", "down", "left", "right", "inner", "outer" and the like indicate the direction or position relationship of the terms based on the direction or position relationship shown in the drawings, which is only for the convenience of description, and does 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 a limitation on the utility model. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In addition, it should also be noted that in the description of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be directly connected, or indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the 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 need for cold or heat, the purpose of saving energy is achieved. However, in actual application, the frequency converter is prone to electronic failure, and the compressor may generate a large current impact when starting, especially when starting at low frequency, which is prone to mechanical impact on the motor and compressor, affecting the reliability and service life of the equipment, and the cost of the screw compressor controlled by the frequency converter is relatively high, including the cost of the frequency converter itself, and the cost of installation, debugging and maintenance. For some small projects, the increase in cost may reduce the economic benefits of the project, in addition, the frequency control system is relatively complex, and the technical requirements for maintenance personnel are high, and once a fault occurs, the maintenance difficulty is also relatively large.

[0033] Therefore, the present application provides a kind of as Figure 1 And Figure 2The compressor assembly comprises: a compression component 1; a driving structure 2 connected to the compression component 1 through a variable speed structure; the variable speed structure comprises at least two groups of gear sets, the transmission ratios of all the gear sets are different, and at most one group of the gear sets works at the same time; the gear set comprises an input gear 31 and an output gear 32 meshing with each other, the input gears 31 of all the gear sets are connected to the driving structure 2; a moving structure 4 movably arranged on the compression component 1, 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 to make the output gears 32 mesh with the corresponding input gears 31. By using gear sets with different transmission ratios to drive the driving structure 2 and the compression component 1, the purpose of making the compression component 1 work at different speeds is achieved by switching different gear sets, without using a frequency converter, so that the problem of electronic component failure does not occur, and the problem of start-up impact due to the presence of the frequency converter is avoided, the cost of the compressor is reduced, the design and manufacturing are relatively easy, the maintenance and replacement of parts are relatively convenient, and the reliability of the compressor is improved. The moving structure 4 can rotate with the output gears 32, and the moving structure 4 can always maintain the connection with the compression component 1, so that the power output by the driving structure 2 can be transmitted to the compression component 1 through any gear set, thereby ensuring the normal work of the compression component 1 and the compression reliability of the compressor assembly.

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

[0035] The frequency converter controlled compressor only adjusts the rotating speed of the compression component 1 by changing the frequency of the motor power supply, which has low adjustment accuracy of the compressor, and can cause the compressor to frequently start and stop, which not only wastes electric energy, but also affects the refrigeration or heating effect. Therefore, the compressor assembly further comprises a control structure, which can obtain the suction pressure and discharge pressure of the compressor, and can control the moving structure 4 to move according to the suction pressure and discharge pressure. The suction pressure and discharge pressure of the compressor are directly used to adjust the moving structure 4, so as to adjust the gear sets meshing with each other, and then adjust the transmission ratio from the driving structure 2 to the compression component 1, thereby achieving the purpose of adjusting the rotating speed of the compression component 1.

[0036] The control structure comprises a differential pressure detection mechanism and a synchronizer 51, the differential pressure detection mechanism is communicated with the suction port of the compressor assembly and the exhaust port of the compressor assembly, the differential pressure detection mechanism can obtain the differential pressure of the suction port and the exhaust port, and a movable component in the differential pressure detection mechanism can move according to the differential pressure, and the moving structure 4 is connected with the movable component through the synchronizer 51. The differential pressure detection mechanism directly obtains the differential pressure of the suction pressure and the exhaust pressure, and the movement of the movable component is driven according to the differential pressure, thereby avoiding the problem that electronic faults are prone to occur in the detection of the electric signal, improving the reliability of the compressor assembly, and the detection of the electric signal has a certain delay, so that the adjustment of the compressor in the adjustment process has a delay, and the present application directly obtains the differential pressure for adjustment, thereby ensuring the real-time performance of the adjustment and the adjustment reliability of the compressor assembly. As shown in Figure 1 The synchronizer is a fork, the handle part of the fork is connected to the movable component, and the head part of the fork is connected to the moving structure, wherein the head part of the fork is two, and the two head parts are connected to different positions of the moving structure, thereby ensuring the reliable movement of the moving structure.

[0037] Specifically, the differential pressure detection mechanism comprises a piston cylinder 52 and a piston 53, the piston 53 is movably arranged in the piston cylinder 52, and the piston 53 divides the inside of the piston cylinder 52 into a first pressure cavity and a second pressure cavity, the first pressure cavity is communicated with the suction port of the compressor assembly, the second pressure cavity is communicated with the exhaust port of the compressor assembly, and the piston 53 constitutes the movable component. The suction of the compressor and the exhaust of the compressor are directly introduced to the two sides of the piston 53, so that the compressor assembly can directly obtain the suction pressure and the exhaust pressure, thereby ensuring the real-time movement of the piston 53, the movement of the piston 53 can drive the synchronizer 51 to move, and then drive the moving structure 4 to move, so that all the output gears 32 change positions, thereby realizing the meshing of different gear sets, and thereby ensuring the self-adjustment of the rotation speed of the compression component 1.

[0038] The variable speed structure further comprises an input shaft 54 and a driven gear 55, the driven gear 55 and all the input gears 31 of the gear sets are arranged on the input shaft 54, and the driven gear 55 is in meshing cooperation with the driving structure 2. That is, all the input gears 31 are arranged side by side in the axial direction of the input shaft 54, the driven gear 55 is also arranged on the input shaft 54, and the driving gear of the driving structure 2 is in meshing cooperation with the driven gear 55, so that the rotation of the driving 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 is needed to drive the output gear 32 to move, so that one of the input gears 31 is in meshing cooperation with the corresponding output gear 32, and the power transmission is completed.

[0039] Further, the variable speed structure further comprises an intermediate shaft and at least two intermediate gears, the input gear 31 and the output gear 32 in each gear set are in transmission cooperation through the corresponding intermediate gears. The intermediate gears further increase the transmission ratio of the input gear 31 and the output gear 32, and improve the rotation speed adjustment range of the compression component 1.

[0040] The compression component 1 comprises a male rotor 11 and a female rotor 12, the male rotor 11 and the female rotor 12 are in meshing with each other, so that the compression of the fluid can be realized, and the male rotor 11 is connected with the driving structure 2 through the variable speed structure, at this time, the male rotor 11 is the driving component of the compression component 1, and the female rotor 12 is the driven component of the compression component 1.

[0041] Alternatively, the female rotor 12 is connected with the driving structure 2 through the variable speed structure, at this time, the female rotor 12 is the driving component of the compression component 1, and the male rotor 11 is the driven component of the compression component 1.

[0042] Since the variable speed structure is arranged, the driving structure 2 is a fixed-frequency motor, and the driving structure 2 can always work at a set rotation speed, so that the cost of the compressor assembly can be further reduced, and the problems of complex control and high maintenance difficulty caused by the use of a frequency converter can be avoided.

[0043] The compressor assembly further comprises:

[0044] A shell 6, the variable speed structure and the compression component 1 are arranged in the shell 6, and a compression cavity is formed in the shell 6, and the compression component 1 compresses the fluid in the compression cavity;

[0045] An air suction end cover 7 is arranged on the shell 6, and the air suction end cover 7 is in communication with the inside of the shell 6, and the driving structure 2 is arranged in the air suction end cover 7, the air suction end cover 7 and the shell 6 are convenient to disassemble, so that the driving structure 2 and the variable speed structure are convenient to disassemble and maintain, and the maintenance difficulty of the compressor assembly is further reduced.

[0046] A compressor system comprising the compressor assembly.

[0047] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent range of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection range of the present application. Therefore, the protection range of the present application patent should be subject to the appended claims.

Claims

1. A compressor assembly characterized by: The compressor assembly comprises: a compression component (1); a driving structure (2) connected to the compression component (1) through a transmission structure; the transmission structure comprises: at least two groups of gear sets, all the gear sets have different transmission ratios, and at most one group of the gear sets works at the same time; each of the gear sets comprises an input gear (31) and an output gear (32) meshing with each other, and all the input gears (31) of the gear sets are connected to the driving structure (2); a moving structure (4) movably arranged on the compression component (1), 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) mesh with the corresponding input gears (31).

2. The compressor assembly of claim 1, wherein: The compressor assembly further comprises a control structure capable of obtaining the suction pressure and discharge pressure of the compressor, and the control structure can control the moving structure (4) to move according to the suction pressure and discharge pressure.

3. The compressor assembly of claim 2, wherein: The control structure comprises a differential pressure detection mechanism and a synchronizer (51), the differential pressure detection mechanism communicates with the suction port of the compressor assembly and the discharge port of the compressor assembly, the differential pressure detection mechanism can obtain the differential pressure of the suction port and the discharge port, and a movable part in the differential pressure detection mechanism can move according to the differential pressure, and the moving structure (4) is connected to the movable part through the synchronizer (51).

4. The compressor assembly of claim 3, wherein: The differential pressure detection mechanism comprises a piston cylinder (52) and a piston (53), the piston (53) is movably arranged in the piston cylinder (52), and the piston (53) divides the inside of the piston cylinder (52) into a first pressure cavity and a second pressure cavity, the first pressure cavity communicates with the suction port of the compressor assembly, the second pressure cavity communicates with the discharge port of the compressor assembly, and the piston (53) constitutes the movable part.

5. The compressor assembly of claim 1, wherein: The transmission structure further comprises an input shaft (54) and a driven gear (55), the driven gear (55) and all the input gears (31) of the gear sets are arranged on the input shaft (54), and the driven gear (55) meshes with the driving structure (2).

6. The compressor assembly of claim 1, wherein: The transmission structure further comprises an intermediate shaft and at least two intermediate gears, the input gear (31) and the output gear (32) in each of the gear sets are driven and cooperated through the corresponding intermediate gears.

7. The compressor assembly of claim 1, wherein: The compression component (1) comprises a male rotor (11) and a female rotor (12), the male rotor (11) and the female rotor (12) mesh with each other, and the male rotor (11) is connected to the driving structure (2) through the transmission structure, or the female rotor (12) is connected to the driving structure (2) through the transmission structure.

8. The compressor assembly of claim 1, wherein: The driving structure (2) is a fixed-frequency motor.

9. The compressor assembly of claim 1, wherein: The compressor assembly further comprises: a housing (6), the transmission structure and the compression component (1) are arranged in the housing (6); An air suction end cover (7) is arranged on the shell (6) and communicates with the inside of the shell (6), and the driving structure (2) is arranged in the air suction end cover (7).

10. A compressor system characterized by: A compressor assembly comprising any one of claims 1 to 9.

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