Three-cylinder sliding vane compressor

Abstract

A three-cylinder sliding vane compressor comprises an upper cylinder, a middle cylinder, a lower cylinder and a rotor shaft, the upper cylinder, the middle cylinder and the lower cylinder are stacked together, the rotor shaft penetrates through the three cylinders, an upper compression cavity, a middle compression cavity and a lower compression cavity are formed in the three cylinders respectively, and the volume of the upper compression cavity and the volume of the lower compression cavity are smaller than the volume of the middle compression cavity; the longitudinal projection of the upper compression cavity coincides with the longitudinal projection of the lower compression cavity and coincides with one part of the longitudinal projection of the middle compression cavity, and the other part of the longitudinal projection is staggered. Compared with the prior art, the three-cylinder sliding vane compressor provided by the utility model has the following advantages that the two cylinders in the middle are skillfully combined into one cylinder to form a larger cylinder, so that the space is saved, the parts are saved, the assembly process is simplified, and the compression efficiency is improved; in specific work, force of high and low pressure of the upper cylinder and the lower cylinder acting on the rotor shaft counteracts force of the middle cylinder acting on the rotor shaft.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, specifically to a three-cylinder sliding vane compressor. Background Technology

[0002] Existing rotary compressors are represented by vane compressors. Their rotors typically include a shaft, a support body mounted on the shaft, and multiple slots on the support body to accommodate vanes. The vanes are slidably positioned within these slots. The rotor rotates eccentrically within the compression chamber, and the vanes extend and retract within the slots according to changes in the distance between themselves and the chamber wall during rotation. Compared to cam-rotor or other types of rotary compressors, vane compressors offer higher compression efficiency within the same volume of compression chamber.

[0003] For example, Chinese patent announcement number 103807174B discloses a three-cylinder rolling rotor compressor. The cylinder assembly has three cylinder units; the vanes of two adjacent cylinders are offset by 120°, and the vanes of the third cylinder are offset by 60° from the vanes of the other two cylinders; the integrated crankshaft has two adjacent eccentric shafts with the same eccentric direction, and the third eccentric shaft is offset by 180° from the other two; a torque balancing mechanism is set for the eccentric shaft offset by 180°; the two cylinders with vanes offset by 120° are assembled on the same side as the two eccentric shafts with the same eccentric direction, and the eccentric shaft offset by 180° is assembled on the other side with the third cylinder. Although the above solution achieves simultaneous operation of three cylinders, a larger displacement, and a more balanced torque and rotation of the compressor, the crankshaft experiences inconsistent force directions in the cylinders during rotation. The crankshaft is subjected to three different forces in the radial direction, always in a helical stress state, which can lead to crankshaft fatigue, overheating, and breakage after long-term use. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a three-cylinder vane compressor that is small in size, has high compression efficiency, and stable shaft operation.

[0005] The main technical solution of the three-cylinder sliding vane compressor provided by this utility model is as follows: A three-cylinder sliding vane compressor includes an upper cylinder, a middle cylinder and a lower cylinder stacked together, and a rotor shaft passing through the three cylinders. An upper compression chamber, a middle compression chamber and a lower compression chamber are formed in the three cylinders respectively. The rotor shaft is provided with an upper sliding groove, a middle sliding groove and a lower sliding groove that run through the rotor shaft along the diameter from top to bottom at the position corresponding to each compression chamber. The upper sliding groove is provided with a first blade and a second blade, the middle sliding groove is provided with a third blade and a fourth blade, and the lower sliding groove is provided with a fifth blade and a sixth blade. Each of the three cylinders is provided with an air inlet and an air outlet that connect to its compression chamber. The volume of the upper compression chamber and the volume of the lower compression chamber are both smaller than the volume of the middle compression chamber. The longitudinal projection of the upper compression chamber coincides with the longitudinal projection of the lower compression chamber, and partially coincides with the longitudinal projection of the middle compression chamber, while the other part is offset.

[0006] The three-cylinder sliding vane compressor provided by this utility model also adopts the following auxiliary technical solutions:

[0007] The upper and lower compression chambers have the same volume, and the sum of the volumes of the upper and lower compression chambers equals the volume of the middle compression chamber.

[0008] The upper, middle, and lower cylinders have the same diameter, and the height of the middle cylinder is the sum of the heights of the upper and lower cylinders.

[0009] The first, second, fifth, and sixth blades have the same structure, and the third and fourth blades have the same structure; the height of the third blade is twice the height of the first blade.

[0010] The exhaust ports of the upper cylinder and the lower cylinder face the same direction, while the exhaust ports of the upper cylinder and the middle cylinder face opposite directions.

[0011] The longitudinal projections of the upper, middle, and lower sliding grooves on the rotor shaft coincide.

[0012] A first sealing part that fits with the rotor shaft is provided on the inner wall between the air inlet and the exhaust port in the upper compression chamber; a second sealing part that fits with the rotor shaft is provided on the inner wall between the air inlet and the exhaust port in the middle compression chamber; and a third sealing part that fits with the rotor shaft is provided on the inner wall between the air inlet and the exhaust port in the lower compression chamber. The longitudinal projections of the first sealing part and the third sealing part coincide and are located on one side of the rotor shaft, while the longitudinal projection of the second sealing part is located on the other side of the rotor shaft.

[0013] The maximum distance between the longitudinal projection of the first sealing part and the longitudinal projection of the second sealing part is equal to the diameter of the rotor shaft.

[0014] The three-cylinder vane compressor includes an upper cylinder body, a middle cylinder body, a lower cylinder body, a first cylinder head located on top of the upper cylinder body, a second cylinder head located between the upper and middle cylinder bodies, a third cylinder head located between the middle and lower cylinder bodies, and a fourth cylinder head located at the bottom of the lower cylinder body.

[0015] Compared with the prior art, the three-cylinder sliding vane compressor provided by this utility model has the following advantages: This utility model ingeniously combines the two middle cylinders into one larger cylinder, thereby saving space, saving parts, simplifying the assembly process, and improving compression efficiency; In specific operation, the forces exerted on the rotor shaft by the high and low pressures of the upper and lower cylinders cancel out the forces exerted on the rotor shaft by the middle cylinder, making the rotor shaft more evenly stressed, the operation more stable, the compression efficiency higher, and the service life longer. This two-bladed rotor generates two compressions and exhausts per revolution of the rotor shaft. Furthermore, the middle compression chamber in this design is larger than the upper and lower compression chambers. Compared to existing cam-type three-cylinder compressors, this invention significantly improves compression efficiency for the same diameter compression chamber. Additionally, the overlapping longitudinal projections of the three grooves facilitate machining on the rotor shaft. This structure ensures balanced force distribution during rotor shaft rotation, with forces acting only in two directions: the upper and lower cylinders are the first, and the middle cylinder is the second. These two directions are opposite and of equal magnitude, thus canceling each other out and resulting in very smooth rotor shaft operation. Attached Figure Description

[0016] Figure 1 This is an exploded view of the structure of this utility model.

[0017] Figure 2 The structure of this utility model Figure 1 .

[0018] Figure 3 The structure of this utility model Figure 2 .

[0019] Figure 4 This is a side view of the present invention.

[0020] Figure 5 for Figure 4 A cross-sectional view of the upper cylinder of the AA.

[0021] Figure 6 for Figure 4 A cross-sectional view of the upper cylinder of the BB.

[0022] Figure 7 for Figure 4 A cross-sectional view of the upper cylinder of the CC. Detailed Implementation

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] A sliding vane compressor typically includes a housing, a motor housed within the housing, and a cylinder. The cylinder contains a compression chamber, within which a sliding vane rotor is mounted. The motor drives the vane rotor to rotate within the compression chamber. The cylinder has an inlet and an outlet connecting to the compression chamber. The vane rotor includes a rotor shaft and first and second vanes slidably mounted on the rotor shaft. The first and second vanes are in close sliding engagement. The rotor shaft has a groove extending through its diameter, within which the first and second vanes are slidably positioned. The cylinder has a shaft hole; one end of the rotor shaft connects to the motor, and the other end passes through the shaft hole into the compression chamber. The sidewall of the rotor shaft abuts against the inner wall of the compression chamber, forming a contact portion located between the inlet and outlet of the compression chamber. The aforementioned housing, motor, and assembly relationships are all relatively mature technologies in the prior art and will not be described in detail here.

[0025] See Figures 1 to 7 According to the embodiment of the three-cylinder sliding vane compressor provided by the utility model, Figure 1 The arrows and dashed lines indicate the assembly direction of the components, including an upper cylinder 110, a middle cylinder 120, and a lower cylinder 130 stacked together, and a rotor shaft 200 passing through the three cylinders. The three cylinders respectively form an upper compression chamber 111, a middle compression chamber 121, and a lower compression chamber 131. From top to bottom, the rotor shaft 200 has an upper sliding groove 201, a middle sliding groove 202, and a lower sliding groove 203 that run through the rotor shaft 200 along its diameter at the location corresponding to each compression chamber. The upper sliding groove 201 contains a first blade 301 and a second blade 303. The blade 302 has a third blade 303 and a fourth blade 304 in the middle sliding groove 202, and a fifth blade 305 and a sixth blade 306 in the lower sliding groove 203. Each of the three cylinders has an inlet port 140 and an exhaust port 150 connecting its compression chamber. The volumes of the upper compression chamber 111 and the lower compression chamber 131 are both smaller than the volume of the middle compression chamber 121. The longitudinal projection of the upper compression chamber 111 coincides with the longitudinal projection of the lower compression chamber 131, and partially coincides with the longitudinal projection of the middle compression chamber 121, while the other part is offset. The longitudinal projection of the compression chamber in the upper cylinder 110 is symmetrical to the longitudinal projection of the compression chamber in the middle cylinder 120 in the diameter direction of the rotor shaft 200. Figures 5 to 7This diagram shows the working state of the upper, middle, and lower cylinders at the same time. This invention utilizes the concept of a four-cylinder engine, with the two pistons in the middle operating in the same cycle, and the two pistons on either side operating in the same cycle. However, the operating conditions and principles of compressor cylinders and engine cylinders are completely different. Therefore, this invention cleverly combines the two middle cylinders into one, saving space, reducing parts, simplifying assembly processes, and improving compression efficiency. Specifically, during operation, the forces exerted on the rotor shaft 200 by the high and low pressures of the upper cylinder 110 and lower cylinder 130 cancel out the force exerted on the rotor shaft 200 by the middle cylinder 120. This results in a more balanced force on the rotor shaft 200, smoother operation, higher compression efficiency, and a longer service life. This two-bladed rotor can generate two compression exhausts every time the two blades rotate once with the rotor shaft 200; at the same time, the middle compression chamber 121 in this design is larger than the upper compression chamber 111 and the lower compression chamber 131. Compared with the existing cam-type three-cylinder compressor, the compression efficiency of this utility model is greatly improved for the same diameter compression chamber.

[0026] See Figures 1 to 7 According to the above-described embodiment of the utility model, the upper compression chamber 111 and the lower compression chamber 131 have the same volume, and the sum of the volumes of the upper compression chamber 111 and the lower compression chamber 131 is equal to the volume of the middle compression chamber 121. This helps to balance the compression resistance of the middle cylinder 120 during operation with the compression resistance of the upper and lower cylinders 130 during operation. The forces exerted on the rotor shaft 200 by the high and low pressures of the upper cylinder 110 and the lower cylinder 130 are exactly the same as the forces exerted on the rotor shaft 200 by the middle cylinder 120, but opposite in direction, thus achieving cancellation.

[0027] See Figures 1 to 7 According to the above-described embodiment of the utility model, the upper cylinder 110, the middle cylinder 120, and the lower cylinder 130 have the same diameter, and the height of the middle cylinder 120 is the sum of the heights of the upper cylinder 110 and the lower cylinder 130. The first blade 301, the second blade 302, the fifth blade 305, and the sixth blade 306 have the same structure, and the third blade 303 and the fourth blade 304 have the same structure; the height of the third blade 303 is twice the height of the first blade 301. The upper cylinder 110 and the lower cylinder 130 have the same height. The three cylinders with the same diameter, stacked together, ensure the flatness of the cylinder body exterior, facilitating the overall assembly of the compressor.

[0028] See Figures 1 to 7According to the above-described embodiment of the utility model, the exhaust ports 150 of the upper cylinder 110 and the lower cylinder 130 are in the same direction, while the exhaust ports 150 of the upper cylinder 110 and the middle cylinder 120 are in opposite directions. This structural design allows the forces exerted on the rotor shaft 200 by the high and low pressures of the upper cylinder 110 and the lower cylinder 130 to cancel out the forces exerted on the rotor shaft 200 by the middle cylinder 120. This results in a more balanced force on the rotor shaft 200 during operation, leading to higher compression efficiency and a longer service life.

[0029] See Figure 1 and Figures 5 to 7 According to the above-described embodiment of the utility model, the longitudinal projections of the upper sliding groove 201, the middle sliding groove 202, and the lower sliding groove 203 on the rotor shaft 200 coincide. The coincidence of the longitudinal projections of the three sliding grooves facilitates the machining of the grooves on the rotor shaft 200. This structure ensures the balance of forces during the rotation of the rotor shaft 200, with forces acting only in two directions: the upper and lower cylinders 130 are in the first direction, and the middle cylinder 120 is in the second direction. The two directions of force are opposite, and the magnitudes of the forces in both directions are equal, thus canceling each other out. This makes the rotor shaft 200 of the present utility model run very smoothly.

[0030] See Figure 1 and Figures 5 to 7 According to the above-described embodiment of the utility model, a first sealing part 112, which fits against the rotor shaft 200, is provided on the inner wall between the air inlet 140 and the exhaust port 150 in the upper compression chamber 111; a second sealing part 122, which fits against the rotor shaft 200, is provided on the inner wall between the air inlet 140 and the exhaust port 150 in the middle compression chamber 121; and a third sealing part 132, which fits against the rotor shaft 200, is provided on the inner wall between the air inlet 140 and the exhaust port 150 in the lower compression chamber 131. The longitudinal projections of the first sealing part 112 and the third sealing part 132 coincide and are located on one side of the rotor shaft 200, while the longitudinal projection of the second sealing part 122 is located on the other side of the rotor shaft 200. The maximum distance between the longitudinal projections of the first sealing part 112 and the second sealing part 122 is equal to the diameter of the rotor shaft 200. The sealing part provides a certain support for the rotor shaft 200 under stress. The above structure allows both sides of the rotor shaft 200 to receive the support of the sealing part. Moreover, the second sealing part 122 in the middle, which is most prone to deformation, is the longest, which effectively avoids deformation of the rotor shaft 200 during operation and improves the stability of the rotor shaft 200 during operation.

[0031] See Figures 1 to 4According to the above-described embodiment of the utility model, the three-cylinder sliding vane compressor includes an upper cylinder body 11, a middle cylinder body 12, a lower cylinder body 13, a first cylinder head 14 disposed on the top of the upper cylinder body 11, a second cylinder head 15 disposed between the upper cylinder body 11 and the middle cylinder body 12, a third cylinder head 16 disposed between the middle cylinder body 12 and the lower cylinder body 13, and a fourth cylinder head 17 disposed at the bottom of the lower cylinder body 13. In this structure, the middle cylinder 120 and the upper and lower cylinders 130 share two cylinder heads, saving the number of cylinder heads, facilitating product assembly, and reducing production costs.

[0032] The technical solution provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A three-cylinder sliding vane compressor, comprising an upper cylinder, a middle cylinder, and a lower cylinder stacked together, a rotor shaft passing through the three cylinders, wherein an upper compression chamber, a middle compression chamber, and a lower compression chamber are respectively formed within the three cylinders, and the rotor shaft, from top to bottom, has an upper sliding groove, a middle sliding groove, and a lower sliding groove that extend through the rotor shaft along its diameter at a position corresponding to each compression chamber; the upper sliding groove has a first vane and a second vane, the middle sliding groove has a third vane and a fourth vane, and the lower sliding groove has a fifth vane and a sixth vane; each of the three cylinders has an inlet port and an outlet port communicating with its compression chamber, characterized in that... The volumes of the upper and lower compression chambers are both smaller than the volume of the middle compression chamber; the longitudinal projection of the upper compression chamber coincides with the longitudinal projection of the lower compression chamber, and partially coincides with the longitudinal projection of the middle compression chamber, while the other part is offset.

2. The three-cylinder sliding vane compressor according to claim 1, characterized in that, The upper and lower compression chambers have the same volume, and the sum of the volumes of the upper and lower compression chambers equals the volume of the middle compression chamber.

3. The three-cylinder sliding vane compressor according to claim 1, characterized in that, The upper, middle, and lower cylinders have the same diameter, and the height of the middle cylinder is the sum of the heights of the upper and lower cylinders.

4. The three-cylinder sliding vane compressor according to claim 3, characterized in that, The first, second, fifth, and sixth blades have the same structure, and the third and fourth blades have the same structure; the height of the third blade is twice the height of the first blade.

5. The three-cylinder sliding vane compressor according to claim 1, characterized in that, The exhaust ports of the upper cylinder and the lower cylinder face the same direction, while the exhaust ports of the upper cylinder and the middle cylinder face opposite directions.

6. The three-cylinder sliding vane compressor according to claim 1, characterized in that, The longitudinal projections of the upper, middle, and lower sliding grooves on the rotor shaft coincide.

7. The three-cylinder sliding vane compressor according to claim 1, characterized in that, A first sealing part that fits with the rotor shaft is provided on the inner wall between the air inlet and the exhaust port in the upper compression chamber; a second sealing part that fits with the rotor shaft is provided on the inner wall between the air inlet and the exhaust port in the middle compression chamber; and a third sealing part that fits with the rotor shaft is provided on the inner wall between the air inlet and the exhaust port in the lower compression chamber. The longitudinal projections of the first sealing part and the third sealing part coincide and are located on one side of the rotor shaft, while the longitudinal projection of the second sealing part is located on the other side of the rotor shaft.

8. The three-cylinder sliding vane compressor according to claim 1, characterized in that, The three-cylinder vane compressor includes an upper cylinder body, a middle cylinder body, a lower cylinder body, a first cylinder head located on top of the upper cylinder body, a second cylinder head located between the upper and middle cylinder bodies, a third cylinder head located between the middle and lower cylinder bodies, and a fourth cylinder head located at the bottom of the lower cylinder body.

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