Linear motor driving type low-pressure large-displacement square screw compressor and working method thereof

Abstract

The invention discloses a linear motor driving type low-pressure large-displacement square screw compressor and a working method thereof, and belongs to the field of compressors. And an upper linear motor driving type spiral compression structure and a lower linear motor driving type spiral compression structure are arranged on the inner wall of the top and the inner wall of the bottom of the mounting shell correspondingly, and the upper linear motor driving type spiral compression structure and the lower linear motor driving type spiral compression structure are mounted in a 180-degree phase mode, so that a relative square track is formed. By adopting the linear motor driving type low-pressure large-displacement square screw compressor and the working method thereof, the advantages of a reciprocating compressor and a scroll compressor are integrated, meanwhile, the requirement for large displacement can be met, and the linear motor driving type low-pressure large-displacement square screw compressor further has the advantages of being low in pressure ratio, low in rotating speed, stable in operation, safe, reliable and the like and has wide application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a linear motor driven low-pressure large-displacement square screw compressor and a working method thereof. Background Art

[0002] Existing compressors generally include reciprocating compressors and scroll compressors. The working process of reciprocating compressors is intermittent, including three stages: suction, compression and discharge. The work is discontinuous and requires an exhaust valve. If the exhaust valve does not work properly, it will seriously affect the performance of the compressor. Although the scroll compressor can compress continuously and does not require an exhaust valve, it still has the following significant limitations:

[0003] 1. Limited exhaust volume: At present, the maximum rotation radius of the scroll compressor does not exceed 5 mm. The main reason is that its driving method mostly relies on the motor to drive the rotation through the shaft. Due to the torque limit, the crankshaft radius cannot be increased, resulting in a smaller rotation radius, which limits the exhaust volume. To solve this problem, there was a plan to use two compressors in parallel. Although it can increase the exhaust volume to a certain extent, this method not only complicates the structure and occupies more space for installation, but also doubles the failure rate and significantly increases the cost. In addition, the method of trying to forcibly increase the displacement by modifying the compressor profile parameters also leads to higher failure rates and a series of other problems due to the increase in torque.

[0004] 2. High processing accuracy requirements: The profile of the scroll compressor requires extremely high processing accuracy. Any deviation will cause large leakage and seriously reduce work efficiency.

[0005] 3. Drive and lubrication mechanism: The scroll compressors on the market usually use motors as driving elements, and need to convert the rotation of the main shaft into the revolution of the spiral disk. To this end, an anti-rotation mechanism must be installed at the lower end of the spiral disk to achieve the horizontal and circular motion of the movable scroll disk. When working, the radial force, tangential force, self-propagation torque and overturning torque of the spiral disk are all transmitted to the anti-rotation device, so the device needs to be lubricated. However, the presence of lubricating oil will lead to oil consumption problems, especially in the chemical industry, where the use of a large number of compressors requires a large amount of money to be invested in oil consumption management every year. Summary of the invention

[0006] The purpose of the present invention is to provide a linear motor driven low-pressure large-displacement square screw compressor and a working method thereof to solve the above technical problems.

[0007] To achieve the above-mentioned objectives, the present invention provides a linear motor driven low-pressure large-displacement square spiral compressor, comprising a mounting shell composed of an upper shell and a lower shell, the top inner wall and the bottom inner wall of the mounting shell are respectively provided with an upper linear motor driven spiral compression structure and a lower linear motor driven spiral compression structure, the upper linear motor driven spiral compression structure and the lower linear motor driven spiral compression structure are installed at a phase of 180° between them, thereby forming a relative square trajectory.

[0008] Preferably, the upper linear motor driven spiral compression structure comprises an upper linear motor mounted on the bottom end of the upper housing and an upper spiral disk connected to the output end of the upper linear motor;

[0009] The lower linear motor driven spiral compression structure comprises a lower linear motor mounted on the top of the lower housing and a lower spiral disc connected to the output end of the lower linear motor;

[0010] Square spiral lines are arranged on opposite sides of the upper spiral disk and the lower spiral disk, and the square spiral lines on the upper spiral disk are interlaced with the square spiral lines on the lower spiral disk to form a compression chamber, which is communicated with the air inlet and the air outlet respectively;

[0011] The upper linear motor and the lower linear motor operate in coordination via differential motion.

[0012] Preferably, the design expression of the square spiral line is as follows:

[0013]

[0014] Where, L represents the total length of the square spiral line; n represents the number of turns of the square spiral line; L 0.5n Indicates the length of the first half circle of the square spiral line; L n represents the length of the nth square spiral line; ΔL represents the elongation of the length of each half turn of the square spiral line;

[0015] in,

[0016] ΔL=P t ;

[0017] Where P t represents the pitch, i.e. the axial distance between two adjacent square spiral lines, and P t =2t+L or , t represents the thickness of the spiral teeth of the square spiral profile; L or Indicates square trajectory travel.

[0018] Preferably, the upper linear motor comprises an upper primary fixed to the bottom end of the upper housing and an upper secondary matched with the upper primary, and the upper secondary is connected to the top end of the upper square spiral disk;

[0019] The lower linear motor comprises a lower primary fixed to the top of the lower shell and a lower secondary matched with the lower primary, and the lower secondary is connected to the bottom end of the lower square spiral disk.

[0020] Preferably, a central exhaust hole is provided in the center surrounded by the square spiral line of the upper spiral disk, and the central exhaust hole is connected with the edge exhaust hole opened on the side wall of the upper spiral disk through an exhaust channel opened inside the upper spiral disk.

[0021] Preferably, both the upper square spiral disk and the lower square spiral disk are made of polytetrafluoroethylene.

[0022] The working method of the linear motor driven low pressure large displacement square screw compressor comprises the following steps:

[0023] The upper linear motor and the lower linear motor operate differentially, thereby driving the upper square spiral disk and the lower square spiral disk to move in a relative square trajectory, and the suction-compression-exhaust process is cyclically performed during the movement;

[0024] The air intake process is as follows: the volume between the teeth of the adjacent square spiral lines on the upper square spiral disk and the lower square spiral disk increases, so that the air pressure in the compression chamber is lower than the external air pressure, and the external gas enters the compression chamber through the air inlet hole to complete the air intake;

[0025] The compression process is as follows: the upper square spiral disk and the lower square spiral disk continue to move along the square trajectory, so that the inter-tooth volume of adjacent square spiral profiles decreases, compressing the inhaled gas until the inter-tooth volume is minimum and the compression is completed;

[0026] The exhaust process is as follows: the compressed gas is discharged through the central exhaust hole, the exhaust channel and the edge exhaust hole in sequence.

[0027] Therefore, the present invention adopts the above-mentioned linear motor driven low-pressure large-displacement square screw compressor and its working method, which has the following beneficial effects:

[0028] 1. The dual linear motor differential drive is adopted to realize the square track movement of the spiral disk through 180° phase difference control, which makes it easy to achieve uniform speed control, thereby eliminating the setting of the anti-rotation mechanism of the traditional scroll compressor, simplifying the structure, and at the same time widening the track radius and increasing the exhaust volume;

[0029] 2. The square spiral profile is used to replace the traditional involute profile, which reduces the requirements for processing accuracy.

[0030] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 An exploded view of a linear motor driven low-pressure and large-displacement square screw compressor according to the present invention;

[0032] Figure 2 It is a square spiral line layout diagram of the upper spiral disk of a linear motor driven low-pressure large-displacement square spiral compressor according to the present invention;

[0033] Figure 3 It is a square spiral line layout diagram of the lower spiral disk of a linear motor driven low-pressure large-displacement square spiral compressor according to the present invention;

[0034] Figure 4 It is a cross-sectional view of the lower linear motor driven spiral compression structure of a linear motor driven low-pressure and large-displacement square spiral compressor according to the present invention;

[0035] Figure 5 It is a layout diagram of the edge exhaust holes of a linear motor driven low-pressure and large-displacement square screw compressor according to the present invention;

[0036] Figure 6 A relative square trajectory diagram of the working method of a linear motor driven low-pressure and large-displacement square screw compressor described in the present invention.

[0037] Reference numerals

[0038] 1. Upper shell; 2. Lower shell; 3. Upper linear motor driven spiral compression structure; 31. Upper linear motor; 311. Upper primary; 312. Upper secondary; 32. Upper spiral disk; 321. Center exhaust hole; 322. Edge exhaust hole; 4. Lower linear motor driven spiral compression structure; 41. Lower spiral disk; 42. Lower linear motor; 421. Lower primary; 422. Lower secondary; 5. Grating scale sensor; 6. Square spiral profile. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not used to limit the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0040] It should be noted that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or devices.

[0041] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0042] like Figure 1-Figure 5 As shown, a linear motor driven low-pressure large-displacement square spiral compressor includes a mounting shell composed of an upper shell 1 and a lower shell 2. The upper shell 1 is detachably connected to the lower shell 2 via hexagonal screws. An upper linear motor driven spiral compression structure 3 and a lower linear motor driven spiral compression structure 4 are respectively provided on the top inner wall and the bottom inner wall of the mounting shell. The upper linear motor driven spiral compression structure 3 and the lower linear motor driven spiral compression structure 4 are installed at a phase of 180° between them, thereby forming a relative square trajectory.

[0043] Specifically, the upper linear motor driven spiral compression structure 3 includes an upper linear motor 31 installed at the bottom end of the upper shell 1 and an upper spiral disk 32 connected to the output end of the upper linear motor 31. The use of a linear motor drive avoids the use of an anti-rotation mechanism and a lubrication device in the scroll compressor; the lower linear motor driven spiral compression structure 4 includes a lower linear motor 42 installed at the top end of the lower shell 2 and a lower spiral disk 41 connected to the output end of the lower linear motor 42; the upper spiral disk 32 and the lower spiral disk 41 are both provided with square spiral profiles 6 on the opposite sides, which reduces the processing difficulty, and the upper spiral The square spiral line 6 on the disk 32 is staggered and meshed with the square spiral line 6 on the lower spiral disk 41 (the upper spiral disk 32 and the lower spiral disk 41 are installed at a phase of 180°, the square spiral line 6 on the upper spiral disk 32 is a spiral structure that rotates counterclockwise from the origin, and the square spiral line 6 on the lower spiral disk 41 is a spiral structure that rotates clockwise from the origin) to form a compression chamber, which is respectively connected to the air inlet and the exhaust hole (the air inlet is formed by the gap left between the two square spiral lines 6); the upper linear motor 31 and the lower linear motor 42 operate in coordination through differential operation.

[0044] The design expression of the square spiral profile 6 is as follows:

[0045]

[0046] Wherein, L represents the total length of the square spiral line 6; n represents the number of turns of the square spiral line 6; L 0.5n Indicates the length of the first half circle of the square spiral line 6; L nrepresents the length of the nth square spiral line 6; ΔL represents the elongation of the length of each half turn of the square spiral line 6;

[0047] in,

[0048] ΔL=P t ;

[0049] Where P t represents the pitch, i.e. the axial distance between two adjacent square spiral lines 6, and P t =2t+L or , t represents the thickness of the spiral teeth of the square spiral profile 6; L or Indicates square trajectory travel.

[0050] The upper linear motor 31 includes an upper primary 311 fixed to the bottom end of the upper housing 1 and an upper secondary 312 matched with the upper primary 311, and the upper secondary 312 is connected to the top end of the upper square spiral disk; the lower linear motor 42 includes a lower primary 421 fixed to the top end of the lower housing 2 and a lower secondary 422 matched with the lower primary 421, and the lower secondary 422 is connected to the bottom end of the lower square spiral disk. In this embodiment, a grating ruler sensor 5 is provided on both the upper secondary 312 and the lower secondary 422 for monitoring the moving position.

[0051] A central exhaust hole 321 is provided in the center surrounded by the square spiral line 6 of the upper spiral disk 32. The central exhaust hole 321 is connected to the edge exhaust hole 322 opened on the side wall of the upper spiral disk 32 through an exhaust channel opened inside the upper spiral disk 32 to prevent the lower linear motor 42 from affecting the exhaust.

[0052] The upper square spiral disk and the lower square spiral disk are both made of polytetrafluoroethylene, thereby utilizing the self-lubricating property of polytetrafluoroethylene and saving lubricating oil.

[0053] The working method of the linear motor driven low pressure large displacement square screw compressor comprises the following steps:

[0054] The upper linear motor 31 and the lower linear motor 42 operate differentially, thereby driving the upper square spiral disk and the lower square spiral disk to do the following: Figure 6 The relative square trajectory shown in the figure moves, and the suction-compression-exhaust process is cyclically performed during the movement; the suction process is: the inter-tooth volume of the adjacent square spiral lines 6 on the upper square spiral disk and the lower square spiral disk increases, so that the air pressure in the compression chamber is lower than the external air pressure, and the external gas enters the compression chamber through the air inlet to complete the suction; the compression process is: the upper square spiral disk and the lower square spiral disk continue to move along the square trajectory, so that the inter-tooth volume of the adjacent square spiral lines 6 decreases, compressing the inhaled gas until the inter-tooth volume is minimum and the compression is completed; the exhaust process is: the compressed gas is discharged through the central exhaust hole 321, the exhaust channel and the edge exhaust hole 322 in sequence.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A linear motor driven low pressure large displacement square screw compressor, comprising a mounting shell consisting of an upper shell and a lower shell, characterized in that: The top inner wall and the bottom inner wall of the mounting shell are respectively provided with an upper linear motor driven spiral compression structure and a lower linear motor driven spiral compression structure, and the upper linear motor driven spiral compression structure and the lower linear motor driven spiral compression structure are installed at a 180° phase to form a relatively square trajectory.

2. The linear motor driven low pressure large displacement square screw compressor according to claim 1, characterized in that: The upper linear motor driven spiral compression structure comprises an upper linear motor mounted on the bottom end of the upper housing and an upper spiral disk connected to the output end of the upper linear motor; The lower linear motor driven spiral compression structure comprises a lower linear motor mounted on the top of the lower housing and a lower spiral disc connected to the output end of the lower linear motor; Square spiral lines are arranged on opposite sides of the upper spiral disk and the lower spiral disk, and the square spiral lines on the upper spiral disk are interlaced with the square spiral lines on the lower spiral disk to form a compression chamber, which is communicated with the air inlet and the air outlet respectively; The upper linear motor and the lower linear motor operate in coordination via differential motion.

3. The linear motor driven low pressure large displacement square screw compressor according to claim 2, characterized in that: The design expression of the square spiral line is as follows: Where, L represents the total length of the square spiral line; n represents the number of turns of the square spiral line; L 0.5n Indicates the length of the first half circle of the square spiral line; L n represents the length of the nth square spiral line; ΔL represents the elongation of the length of each half turn of the square spiral line; in, ΔL=P t ; Where P t represents the pitch, i.e. the axial distance between two adjacent square spiral lines, and P t =2t+L or , t represents the thickness of the spiral teeth of the square spiral profile; L or Indicates square trajectory travel.

4. The linear motor driven low pressure large displacement square screw compressor according to claim 2, characterized in that: The upper linear motor comprises an upper primary fixed to the bottom end of the upper housing and an upper secondary matched with the upper primary, and the upper secondary is connected to the top end of the upper square spiral disk; The lower linear motor comprises a lower primary fixed to the top of the lower shell and a lower secondary matched with the lower primary, and the lower secondary is connected to the bottom end of the lower square spiral disk.

5. The linear motor driven low pressure large displacement square screw compressor according to claim 2, characterized in that: A central exhaust hole is arranged at the center surrounded by the square spiral line of the upper spiral disk, and the central exhaust hole is communicated with the edge exhaust hole opened on the side wall of the upper spiral disk through an exhaust channel opened inside the upper spiral disk.

6. The linear motor driven low pressure large displacement square screw compressor according to claim 2, characterized in that: The upper square spiral disk and the lower square spiral disk are both made of polytetrafluoroethylene.

7. A working method of a linear motor driven low pressure large displacement square screw compressor according to any one of claims 2 to 6, characterized in that: The following steps are involved: The upper linear motor and the lower linear motor operate differentially, thereby driving the upper square spiral disk and the lower square spiral disk to move in a relative square trajectory, and the suction-compression-exhaust process is cyclically performed during the movement; The air intake process is as follows: the volume between the teeth of the adjacent square spiral lines on the upper square spiral disk and the lower square spiral disk increases, so that the air pressure in the compression chamber is lower than the external air pressure, and the external gas enters the compression chamber through the air inlet hole to complete the air intake; The compression process is as follows: the upper square spiral disk and the lower square spiral disk continue to move along the square trajectory, so that the inter-tooth volume of adjacent square spiral profiles decreases, compressing the inhaled gas until the inter-tooth volume is minimum and the compression is completed; The exhaust process is as follows: the compressed gas is discharged through the central exhaust hole, the exhaust channel and the edge exhaust hole in sequence.

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