Oil-free compressor

Abstract

The utility model relates to an oilless compressor which comprises a crankcase, the crankcase is connected with an air cylinder box, a crankshaft is arranged in the crankcase and connected with an air cylinder through a connecting rod, the air cylinder reciprocates in the air cylinder box, balancing weights are arranged at the two ends of the crankshaft, a transmission shaft is fixedly connected to the rotating center of the balancing weight on one side, and a transmission shaft is fixedly connected to the rotating center of the balancing weight on the other side. The transmission shaft penetrates through the bearing box to be connected with the transmission wheel, the bearing box is connected with the crankcase, the transmission shaft is connected with the bearing box through a bearing, and the shaft diameter of the transmission shaft is not smaller than one third of the sectional area of the balancing weight. According to the oilless compressor, the balancing weights are arranged at the two ends of the crankshaft, the rotating center of the balancing weight on one side is fixedly connected with the transmission shaft, the crankshaft is supported only through the transmission shaft, vibration of the crankshaft is completely transmitted to the transmission shaft, the crankshaft is not connected with the crankcase, and vibration of the crankshaft cannot be transmitted to the crankcase; vibration of the crankcase can be reduced, and therefore vibration noise is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil-free compressors, in particular to an oil-free compressor. Background Art

[0002] When the compressor is working, the motor drives the crankshaft to rotate, and the piston reciprocates through the connecting rod, thereby changing the cylinder volume, causing the gas pressure in the cylinder to change. The gas enters the cylinder through the cylinder head and the intake valve, and is compressed into a compressed gas with a pressure of 0.7MPa, and is used through the exhaust valve. Due to the high-speed friction between the cylinder and the piston, the application of lubricating oil is becoming more and more extensive. In the process of compressing gas, the gas inevitably comes into contact with the lubricating oil, and the temperature is high. When the working medium is some combustion-supporting gas, it is likely to cause an explosion and an accident. In addition, in the process of compressing gas, some gases corrode the lubricating oil and reduce the viscosity of the oil, so that the performance of the lubricating oil decreases and cannot play a normal lubricating role; and in the petroleum industry, some gases require operation at a lower temperature, and once the temperature of the gas sucked by the compressor is extremely low, the lubricating oil may solidify and cannot play a lubricating role, or the lubricating oil carried in the gas may cause the catalyst in the reactor to be poisoned, etc., so it is necessary to design an oil-free compressor. Utility Model Content

[0003] The embodiment of the utility model provides an oil-free compressor to solve the problem of gas pollution or equipment damage caused by the use of lubricating oil in the prior art.

[0004] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0005] An oil-free compressor comprises a crankcase, wherein the crankcase is connected to a cylinder box, a crankshaft is arranged in the crankcase, the crankshaft is connected to a cylinder via a connecting rod, the cylinder reciprocates in the cylinder box, counterweights are arranged at both ends of the crankshaft, the rotation center of the counterweight on one side is fixedly connected to a transmission shaft, the transmission shaft passes through a bearing box and is connected to a transmission wheel, the bearing box is connected to the crankcase, the transmission shaft and the bearing box are connected via a bearing, and the shaft diameter of the transmission shaft is not less than one-third of the cross-sectional area of ​​the counterweight.

[0006] Furthermore, the transmission shaft is a tapered shaft that is thin on the outside and thick on the inside, and the shaft diameter is the largest at the connection between the transmission shaft and the counterweight block.

[0007] Furthermore, the cross section of the counterweight block is a centrally symmetrical figure.

[0008] Furthermore, the cross-sectional shape of the counterweight block is circular.

[0009] Furthermore, a counterweight support device for supporting a counterweight block is provided in the crankcase, the counterweight support device is arranged below the counterweight block, and a roller is provided at the connection between the top of the counterweight support device and the counterweight block.

[0010] Furthermore, rollers are provided on both sides of the top of the counterweight support device.

[0011] Furthermore, the counterweight support device is provided with an elastic body that makes the roller elastic and a guide groove for guiding the vertical elasticity of the elastic body.

[0012] Furthermore, a high-temperature elastic ring is provided at the connection between the crankcase and the cylinder box.

[0013] Furthermore, an elastic ring is provided at the connection between the crankcase and the bearing box.

[0014] Furthermore, a sound insulation layer is provided on the outer side of the bearing box.

[0015] The utility model embodiment has the following advantages:

[0016] The utility model provides an oil-free compressor with counterweights at both ends of the crankshaft, wherein the rotation center of the counterweight on one side is fixedly connected to the transmission shaft, and the crankshaft is supported only by the transmission shaft, and the vibration of the crankshaft is completely transmitted to the transmission shaft, so that the crankshaft is not connected to the crankcase, and the vibration of the crankshaft cannot be transmitted to the crankcase, which can reduce the vibration of the crankcase, thereby reducing vibration noise. The vibration reduction and silencing effect on the transmission shaft is further improved, and the vibration reduction and silencing are concentrated, which can achieve the minimum cost of vibration reduction and silencing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0019] Figure 1 An internal structure diagram of an oil-free compressor provided by an embodiment of the utility model;

[0020] Figure 2 A structural diagram of a counterweight system in an oil-free compressor provided in an embodiment of the utility model;

[0021] Figure 3 A structural diagram of another counterweight system in an oil-free compressor provided in an embodiment of the utility model.

[0022] In the figure:

[0023] 1. Crankcase; 2. Cylinder box; 3. Crankshaft; 4. Connecting rod; 5. Cylinder; 6. Counterweight; 7. Transmission shaft; 8. High-temperature elastic ring; 9. Elastic ring; 10. Counterweight support device; 11. Roller; 12. Guide groove; 13. Roller frame; 14. Cylindrical structure; 15. Cylindrical guide body; 16. High-temperature resistant elastic pad; 17. Protruding structure; 18. Elastomer; 19. Bearing box. DETAILED DESCRIPTION

[0024] The following is a specific embodiment of the present invention. People familiar with the technology can easily understand the other advantages and functions of the present invention from the contents disclosed in this specification. Obviously, the described embodiment is a part of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figure 1 As shown, an oil-free compressor includes a crankcase 1, wherein the crankcase 1 is connected to a cylinder box 2, wherein a crankshaft 3 is arranged inside the crankcase 1, wherein the crankshaft 3 is connected to a cylinder 5 via a connecting rod 4, wherein the cylinder 5 reciprocates inside the cylinder box 2, wherein counterweights 6 are arranged at both ends of the crankshaft 3, wherein the counterweight 6 on one side is fixedly connected to a transmission shaft 7 at its rotation center, wherein the transmission shaft 7 passes through a bearing box and is connected to a transmission wheel, wherein the bearing box is connected to the crankcase 1, and wherein the transmission shaft 7 and the bearing box are connected via bearings. The counterweight 6 is used to balance the rotational force on both sides of the crankshaft 3, so that it can be connected to the transmission shaft 7 only through one end and have no connection on the other side. When the crankshaft 3 rotates, only one end is connected to the crankcase 1, so that the rotational force of the crankshaft 3 is concentrated and transmitted to the crankcase 1 through the transmission rod. In this way, it is only necessary to reduce the vibration between the crankcase 1 and the transmission rod to reduce the vibration of the crankcase 1, so as to reduce the noise emitted by the crankcase 1 due to vibration. If a sound insulation layer is provided on the outer side of the bearing box, the vibration noise of the transmission shaft 7 in the bearing box can be reduced.

[0026] A high-temperature elastic ring 8 is provided at the connection between the crankcase 1 and the cylinder box 2. The high-temperature elastic ring 8 is used to tighten the connection between the crankcase 1 and the cylinder box 2 on the one hand, and on the other hand, it allows a slight elasticity between the crankcase 1 and the cylinder box 2, which can alleviate the vibration transmitted to the crankcase 1 by the cylinder box 2.

[0027] An elastic ring 9 is provided at the connection between the crankcase 1 and the bearing box. The elastic ring 9 is used to tighten the connection between the crankcase 1 and the bearing box on the one hand, and on the other hand, a slight elasticity exists between the crankcase 1 and the bearing box, which can alleviate the vibration transmitted from the transmission shaft 7 to the bearing box.

[0028] Since the transmission shaft 7 absorbs all the vibrations of the crankshaft 3, it is necessary to increase the stability of the transmission shaft 7. Compared with the traditional shaft, the present technology increases the shaft diameter of the transmission shaft 7, that is, the shaft diameter of the transmission shaft 7 is not less than one-third of the cross-sectional area of ​​the counterweight 6, so that the distance between the transmission shaft 7 and the outer edge of any rotation of the counterweight 6 is smaller than the shaft diameter of the transmission shaft 7, thereby ensuring the stability of the connection between the transmission shaft 7 and the counterweight 6. The present technology is preferably a tapered shaft with a thin outer surface and a thick inner surface, and the shaft diameter at the connection between the transmission shaft 7 and the counterweight 6 is the largest.

[0029] The cross section of the counterweight block 6 is a centrally symmetrical figure, such as a circle, a square, a polygon, etc. Among these shapes, the optimal shape of the counterweight block 6 is a circle, which can balance the forces at all angles of the counterweight block 6, and a counterweight support device 10 can be provided at the lower part of the counterweight block 6. A roller 11 is provided at the connection between the top of the counterweight support device 10 and the counterweight block 6, so that a rolling connection is formed between the counterweight block 6 and the counterweight support device 10. In order to increase the supporting effect, the number of rollers 11 can be increased, and rollers 11 are provided on both sides of the top of the counterweight support device 10, so that a double-point support is formed between the registration support device and the counterweight block 6, and the supporting effect is more stable.

[0030] The counterweight support device 10 is provided with an elastic body 18 for making the roller 11 elastic and a guide groove 12 for guiding the vertical elasticity of the elastic body. The elastic body can be arranged at the bottom of the counterweight support device 10 or between the roller 11 and the counterweight support device 10. The elastic body 18 is a spring or a high temperature resistant elastic material. According to the different types of the elastic body 18, the counterweight support devices are:

[0031] If the elastomer 18 is a spring, a cylindrical guide body 14 for guiding the vertical extension and retraction of the spring is provided in the crankcase 1, and a guide groove 12 is provided in the cylindrical guide body 14. The spring is fixed in the cylindrical guide body 14, and the top of the spring is fixedly connected to the roller frame 13. The roller 11 is rotatably connected to the roller frame 13. In order to reduce the friction between the spring and the cylindrical guide body 14, a downwardly extending cylindrical structure 13 is provided at the bottom of the roller frame 13. The cylindrical structure 13 is sleeved between the elastomer and the cylindrical guide body 14. The outer wall cross-section of the cylindrical structure 13 is trapezoidal or arc-shaped, which can reduce the contact surface between the outer wall of the cylindrical structure 13 and the inner wall of the cylindrical guide body 14, thereby reducing the friction between the two.

[0032] If the elastic body 18 is a high temperature resistant elastic pad 15 arranged at the bottom of the roller frame 13 , protruding structures 16 are arranged on both sides of the counterweight support device in the crankcase 1 , and the space between the two protruding structures 16 forms a guide groove 12 .

[0033] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. An oil-free compressor, comprising a crankcase, the crankcase being connected to a cylinder box, a crankshaft being arranged in the crankcase, the crankshaft being connected to a cylinder via a connecting rod, and the cylinder reciprocating in the cylinder box, characterized in that: Counterweights are provided at both ends of the crankshaft, and the rotation center of the counterweight on one side is fixedly connected to the transmission shaft, the transmission shaft passes through the bearing box to connect the transmission wheel, the bearing box is connected to the crankcase, the transmission shaft and the bearing box are connected by bearings, and the shaft diameter of the transmission shaft is not less than one-third of the cross-sectional area of ​​the counterweight.

2. An oil-free compressor according to claim 1, characterized in that: The transmission shaft is a tapered shaft that is thin on the outside and thick on the inside, and the shaft diameter is the largest at the connection between the transmission shaft and the counterweight block.

3. An oil-free compressor according to claim 1, characterized in that: The cross section of the counterweight block is a centrally symmetrical figure.

4. An oil-free compressor according to claim 3, characterized in that: The cross-sectional shape of the counterweight block is circular.

5. An oil-free compressor according to claim 4, characterized in that: A counterweight support device for supporting a counterweight block is provided in the crankcase. The counterweight support device is arranged below the counterweight block. A roller is provided at the connection between the top of the counterweight support device and the counterweight block.

6. An oil-free compressor according to claim 5, characterized in that: Rollers are arranged on both sides of the top of the counterweight support device.

7. An oil-free compressor according to claim 5, characterized in that: The counterweight supporting device is provided with an elastic body which makes the roller elastic and a guide groove which is used to guide the vertical elasticity of the elastic body.

8. The oil-free compressor according to claim 1, characterized in that: A high-temperature elastic ring is provided at the connection between the crankcase and the cylinder box.

9. The oil-free compressor according to claim 1, characterized in that: An elastic ring is provided at the connection between the crankcase and the bearing box.

10. The oil-free compressor according to claim 1, characterized in that: A sound insulation layer is arranged on the outer side of the bearing box.

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