Crankshaft lubricating structure of diaphragm compressor

Abstract

The utility model discloses a crankshaft lubrication structure of a diaphragm compressor, which relates to the technical field of diaphragm compressors and comprises a crankshaft, the crankshaft rotates around a rotating axis, at least two matching parts are arranged on the crankshaft, two adjacent matching parts are arranged on two sides of the rotating axis, and the two adjacent matching parts are arranged in a staggered manner along the direction of the rotating axis. The matching parts are provided with radial oil ducts, at least one communicating oil duct is arranged in the crankshaft, the communicating oil duct penetrates through the two adjacent matching parts at the same time, the two ends of the communicating oil duct communicate with the radial oil ducts in the two adjacent matching parts, the crankshaft is provided with an oil inlet channel, the oil inlet channel communicates with the communicating oil duct, and the two ends of the crankshaft are each provided with an axial oil duct; a connecting rod is arranged on the crankshaft, one end of the connecting rod is rotationally connected to the matching part, lubricating oil can enter the wall face, matched with the matching part, of the connecting rod along the communicating oil channel and reach the bearing from the axial oil channel, and therefore a kinematic pair is lubricated, operation stability is improved, and high-speed stable work of the diaphragm compressor is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragm compressors, and particularly relates to a crankshaft lubrication structure of a diaphragm compressor. Background Art

[0002] As a kind of reciprocating compressor, the basic transmission components of a diaphragm compressor include a crankshaft, bearings, bearing bushes, connecting rods, crossheads, pistons, piston bodies and other components. When the compressor is working, the moving pairs between the crankshaft and the bearings, the crankshaft and the bearing bushes, the bearing bushes and the connecting rods, etc. need to be fully lubricated. Otherwise, long-term friction will cause wear of each component. In the current prior art, lubricating oil is supplied to the transmission components through the through-hole oil passages provided on the transmission shaft. However, this method will reduce the strength of the transmission shaft and shorten the service life of the transmission shaft. Content of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a crankshaft lubrication structure of a diaphragm compressor, which can improve the lubrication effect, operation stability and service life.

[0004] According to an embodiment of the utility model, a crankshaft lubrication structure of a diaphragm compressor includes:

[0005] A crankshaft, with bearings provided at both ends. The crankshaft rotates around a rotation axis. At least two mating parts are provided on the crankshaft. Adjacent two mating parts are arranged on both sides of the rotation axis. Along the direction of the rotation axis, adjacent two mating parts are arranged in a staggered manner. The mating part is provided with a radial oil passage. At least one communication oil passage is provided in the crankshaft. The communication oil passage penetrates through two adjacent mating parts at the same time, and its two ends communicate with the radial oil passages in two adjacent mating parts. An oil inlet passage is provided at any one end of the crankshaft. The oil inlet passage communicates with the communication oil passage. Axial oil passages are provided at both ends of the crankshaft. The two ends of the axial oil passage communicate with the communication oil passage and the outside of the end face of the crankshaft;

[0006] At least two connecting rods are provided on the crankshaft. One end of the connecting rod is rotatably connected to the mating part. Lubricating oil can enter the crankshaft from the oil inlet passage, and enter the wall surface where the connecting rod and the mating part cooperate along the communication oil passage. And the lubricating oil can reach the bearing from the axial oil passage.

[0007] A crankshaft lubrication structure of a diaphragm compressor according to an embodiment of the present invention has at least the following beneficial effects: In this embodiment, a crankshaft is provided, bearings are provided at both ends of the crankshaft, the crankshaft rotates around the rotation axis, at least two mating parts are provided on the crankshaft, two adjacent mating parts are respectively arranged on both sides of the rotation axis, and along the direction of the rotation axis, two adjacent mating parts are arranged in a staggered manner. The mating part is provided with a radial oil passage, at least one communication oil passage is provided in the crankshaft, the communication oil passage penetrates through two adjacent mating parts at the same time, and its two ends communicate with the radial oil passages in two adjacent mating parts. An oil inlet passage is provided at any one end of the crankshaft, the oil inlet passage communicates with the communication oil passage, axial oil passages are provided at both ends of the crankshaft, and both ends of the axial oil passage communicate with the communication oil passage and the outside of the end face of the crankshaft; at least two connecting rods are provided on the crankshaft, one end of the connecting rod is rotatably connected to the mating part, lubricating oil can enter the crankshaft from the oil inlet passage, and enter the wall surface where the connecting rod and the mating part cooperate along the communication oil passage, and the lubricating oil can reach the bearing from the axial oil passage, so as to realize the lubrication of the bearing and the part where the connecting rod and the mating part cooperate, improve the lubrication effect on multiple pairs of moving parts, thereby improving the running stability and maintaining the high-speed and stable operation of the diaphragm compressor; moreover, there is no need to open an oil passage on the transmission shaft, which can avoid reducing the strength of the transmission shaft due to opening the oil passage.

[0008] According to some embodiments of the present invention, first connection parts and second connection parts are respectively provided at both ends of the connecting rod, the first connection part of the connecting rod is rotatably connected to the mating part, and a bearing is provided on the second connection part of the connecting rod.

[0009] According to some embodiments of the present invention, a passage extending in a direction perpendicular to the rotation axis is provided on the connecting rod, both ends of the passage communicate with the first connection part and the second connection part, and one end of the passage communicates with the radial oil passage.

[0010] According to some embodiments of the present invention, the mating part includes a first pin part and a second pin part, and the radial oil passage includes a first radial oil passage provided in the first pin part and a second radial oil passage provided in the second pin part.

[0011] According to some embodiments of the present invention, the oil inlet passage includes a third radial oil passage and a third axial oil passage, the third radial oil passage extends in a direction perpendicular to the rotation axis, and communicates with the third axial oil passage and the outside of the radial outer wall of the crankshaft.

[0012] According to some embodiments of the present invention, a first bearing and a second bearing are respectively provided at both ends of the crankshaft, the axial oil passage includes a first axial oil passage and a second axial oil passage, the end of the first axial oil passage points to the first bearing, and the end of the second axial oil passage points to the second bearing.

[0013] According to some embodiments of the present invention, a fourth radial oil passage is further provided in the crankshaft, and both ends of the fourth radial oil passage communicate with the third axial oil passage and the communication oil passage respectively.

[0014] According to some embodiments of the present utility model, the extending direction of the communicating oil passage is inclined to the rotation axis.

[0015] According to some embodiments of the present utility model, the ends of the first axial oil passage and the second axial oil passage near the bearing are both communicated with the outside of the end of the crankshaft, and nozzles are provided at the ends.

[0016] According to some embodiments of the present utility model, one end of the crankshaft provided with the oil inlet passage is inserted and installed in the first mounting seat, and the first mounting seat has an oil inlet pipe, and the oil inlet pipe is communicated with the third radial oil passage.

[0017] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0018] The following further describes the present utility model in conjunction with the drawings and embodiments, where:

[0019] Figure 1 is a cross-sectional view of a crankshaft lubrication structure of a diaphragm compressor in an embodiment of the present utility model;

[0020] Figure 2 is a cross-sectional view of the crankshaft in an embodiment of the present utility model;

[0021] Figure 3 is Figure 1 an enlarged view of A in

[0022] Figure 4 is Figure 1 an enlarged view of B in

[0023] Reference Numerals:

[0024] Crankshaft 100; First pin portion 101; Second pin portion 102; First radial oil passage 103; Second radial oil passage 104; Third radial oil passage 105; First axial oil passage 106; Second axial oil passage 107; Third axial oil passage 108; First crank 109; Communicating oil passage 110; Second crank 111; Fourth radial oil passage 112; First mounting seat 113; Second mounting seat 114; First bearing 115; Second bearing 116; Rotation axis 117; Oil inlet pipe 118; Sealing ring 119;

[0025] Connecting rod 120; Bearing bush 121; First connecting portion 122; Second connecting portion 123; Passage 124; Transmission shaft 125; Third bearing 126; Nozzle 127. Detailed Embodiments

[0026] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0027] In the description of the present utility model, it should be understood that with regard to the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0028] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If the first and second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0029] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present utility model in combination with the specific content of the technical solution.

[0030] As a kind of reciprocating compressor, the basic transmission components of a diaphragm compressor include components such as a crankshaft, bearings, bearing bushes, connecting rods, crossheads, pistons, and piston bodies. When the compressor is working, the kinematic pairs between the crankshaft and the bearings, the crankshaft and the bearing bushes, the bearing bushes and the connecting rods, etc. need to be fully lubricated. Otherwise, long-term friction will cause wear of each component. In the current prior art, lubrication is achieved by supplying oil to the transmission components through the through-hole oil passages provided on the transmission shaft. However, this method will reduce the strength of the transmission shaft and shorten the service life of the transmission shaft.

[0031] To solve the above problems, with reference to Figure 1, in a crankshaft lubrication structure of a diaphragm compressor according to an embodiment of the present invention, it includes a crankshaft 100. Bearings are provided at both ends of the crankshaft 100. The crankshaft 100 rotates around a rotation axis 117. At least two mating parts are provided on the crankshaft 100. Adjacent two mating parts are arranged on both sides of the rotation axis 117. Along the direction of the rotation axis 117, adjacent two mating parts are arranged in a staggered manner. It can be understood that at least two connecting rods 120 are installed on the crankshaft 100. The connecting rods 120 are rotatably connected to the mating parts. When the crankshaft 100 rotates around the rotation axis 117, the connecting rods 120 reciprocate in a direction perpendicular to the rotation axis 117. It can be understood that the connecting rod 120 has a first connecting part 122 that mates with the outer wall surface of the mating part. Refer to Figure 4 , a bearing bush 121 is provided between the first connecting part 122 and the mating part. During the working process, the bearing bush 121 bears frictional loss. Therefore, a radial oil passage is provided in the mating part. At least one communicating oil passage 110 is provided in the crankshaft 100. The communicating oil passage 110 penetrates through two adjacent mating parts at the same time, and its two ends communicate with the radial oil passages in two adjacent mating parts. An oil inlet passage is provided at any one end of the crankshaft 100. The oil inlet passage communicates with the communicating oil passage 110. Lubricating oil can enter the crankshaft 100 from the oil inlet passage and enter the wall surface where the connecting rod 120 mates with the mating part along the communicating oil passage 110, so as to realize lubrication of the bearing and the part where the connecting rod 120 mates with the mating part; at the same time, axial oil passages are provided at both ends of the crankshaft 100. The two ends of the axial oil passage communicate with the communicating oil passage 110 and the outside of the end face of the crankshaft 100, and the lubricating oil can reach the bearing from the axial oil passage, which can improve the lubrication effect of each moving pair, thereby improving the running stability and maintaining the high-speed and stable operation of the diaphragm compressor. Further, a transmission shaft 125 is connected to any one end of the crankshaft 100. The oil inlet passage, the radial oil passage, the axial oil passage and the communicating oil passage 110 are all arranged on the crankshaft 100, and there is no need to open an oil passage on the transmission shaft 125, which can avoid the reduction of the strength of the transmission shaft 125 caused by opening the oil passage.

[0032] It can be understood that, refer to Figure 2The mating portion includes a first pin portion 101 and a second pin portion 102, the first pin portion 101 and the second pin portion 102 are respectively located on both sides of the rotation axis 117, and along the direction of the rotation axis 117, the first pin portion 101 and the second pin portion 102 are staggered. The radial oil passage includes a first radial oil passage 103 provided in the first pin portion 101 and a second radial oil passage 104 provided in the second pin portion 102. The first pin portion 101 and the second pin portion 102 are both connected to a connecting rod 120, and the first radial oil passage 103 and the second radial oil passage 104 are both connected to the connecting oil passage 110. The lubricating oil enters the connecting oil passage 110 from the oil inlet passage, and can flow from the connecting oil passage 110 to the first radial oil passage 103 and the second radial oil passage 104, thereby lubricating the bearing 121 and the third bearing 126 located at the second connecting portion 123 on the connecting rod 120, thereby meeting the lubrication needs of each kinematic pair when running at high speed.

[0033] Furthermore, the crankshaft 100 is further provided with a first crank 109 and a second crank 111, and the first crank 109 and the second crank 111 both extend outward away from the rotation axis 117 in a direction perpendicular to the rotation axis 117, the first pin portion 101 is located at one end of the first crank 109 away from the rotation axis 117, and the second pin portion 102 is located at one end of the second crank 111 away from the rotation axis 117. It can be understood that the first crank 109 and the second crank 111 can be located in the same plane, that is, the angle between the extension direction of the first crank 109 and the second crank 111 is 180 degrees, or the extension direction of the first crank 109 and the second crank 111 is an obtuse angle or an acute angle less than 180 degrees. In this embodiment, the extension direction angle between the first crank 109 and the second crank 111 is 180 degrees, so that the connecting oil passage 110 can be simultaneously connected to the first pin portion 101 and the second pin portion 102, and the extension direction of the connecting oil passage 110 is inclined to the rotation axis 117, so that the connecting oil passage 110 can be formed by drilling in one time, which is conducive to simplifying the process.

[0034] It can be understood that the first bearing 115 and the second bearing 116 are respectively provided at both ends of the crankshaft 100, and the axial oil passage includes the first axial oil passage 106 and the second axial oil passage 107. The first axial oil passage 106 is located on the first crank 109 and points to the end of the first bearing 115, and the second axial oil passage 107 is located on the second crank 111 and points to the end of the second bearing 116. The first axial oil passage 106 and the second axial oil passage 107 are respectively connected to the two ends of the connecting oil passage 110, and the lubricating oil can enter the connecting oil passage 110 from the oil inlet channel, and then enter the first axial oil passage 106 and the second axial oil passage 107 from the connecting oil passage 110, thereby realizing the lubrication function of the first bearing 115 and the second bearing 116. Furthermore, the ends of the first axial oil channel 106 and the second axial oil channel 107 close to the bearings are connected to the outside of the end of the crankshaft 100, and a nozzle 127 is provided on the end. It can be understood that the aperture of the nozzle 127 is smaller than the aperture of the first axial oil channel 106 and the second axial oil channel 107, so it can effectively increase the injection pressure, so that the lubricating oil can be sprayed onto the first bearing 115 and the second bearing 116 to ensure a good lubrication effect.

[0035] It can be understood that a second connection portion 123 is provided on the other end of the connecting rod 120 away from the first connection portion 122, the first connection portion 122 of the connecting rod 120 is rotatably connected to the mating portion, and the second connection portion 123 of the connecting rod 120 is provided with a bearing, and the second connection portion 123 is used to connect the piston, and the reciprocating motion of the piston is driven by the connecting rod 120 to realize the reciprocating motion of the diaphragm and thus realize the function of compressing the gas. Therefore, a third bearing 126 is also provided on the connecting rod 120 at the position of the second connection portion 123, and a channel 124 extending in a direction perpendicular to the rotation axis 117 is provided on the connecting rod 120, both ends of the channel 124 are connected to the first connection portion 122 and the second connection portion 123, and one end of the channel 124 is connected to the radial oil channel, so that the lubricating oil can enter the channel 124 through the radial oil channel to lubricate the third bearing 126, thereby realizing the functions of reducing wear and lowering temperature and improving the stability of high-speed operation of the equipment.

[0036] Reference Figure 2, it can be understood that the oil inlet passage includes a third radial oil passage 105 and a third axial oil passage 108. The third radial oil passage 105 extends in a direction perpendicular to the rotation axis 117 and communicates with the outside of the third axial oil passage 108 and the radial outer wall of the crankshaft 100, enabling lubricating oil to enter the third radial oil passage 105 from the outside. Further, one end of the crankshaft 100 where the oil inlet passage is provided is inserted and installed in the first mounting seat 113 and is rotatably connected to the first mounting seat 113 through the first bearing 115. The other end of the crankshaft 100 away from the first mounting seat 113 is inserted and installed in the second mounting seat 114 and is rotatably connected to the second mounting seat 114 through the second bearing 116. The first mounting seat 113 has an oil inlet pipe 118, and the oil inlet pipe 118 communicates with the third radial oil passage 105. It can be understood that the oil inlet pipe 118 on the first mounting seat 113 is connected to an oil pump, and the oil pump can transport the lubricating oil from the oil inlet pipe 118 to the oil inlet passage and into the crankshaft 100. It can be understood that the third axial oil passage 108 can be arranged on the rotation axis 117 or on one side of the rotation axis 117. In this embodiment, the extending direction of the third axial oil passage 108 coincides with the rotation axis 117. A fourth radial oil passage 112 is further provided in the crankshaft 100, and both ends of the fourth radial oil passage 112 communicate with the third axial oil passage 108 and the communication oil passage 110 respectively, so that the third axial oil passage 108 and the communication oil passage 110 communicate with each other.

[0037] Referring to Figure 3 , it can be understood that along the direction of the rotation axis 117, sealing rings 119 are provided on both sides of the oil inlet pipe 118. The radial inner walls of the sealing rings 119 abut against the radial outer wall of the crankshaft 100, thereby preventing the lubricating oil from leaking to the outside from the part where the oil inlet pipe 118 communicates with the third radial oil passage 105, achieving sealing and ensuring the pressure of the lubricating oil.

[0038] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art to which the present invention pertains, various changes can be made without departing from the gist of the present invention.

Claims

1. A crankshaft lubrication structure for a diaphragm compressor, characterized in that: include: A crankshaft, bearings are provided at both ends, the crankshaft rotates around a rotation axis, at least two matching parts are provided on the crankshaft, two adjacent matching parts are provided on both sides of the rotation axis, and along the direction of the rotation axis, two adjacent matching parts are staggered, the matching parts are provided with radial oil passages, at least one connecting oil passage is provided in the crankshaft, the connecting oil passage is simultaneously penetrated through two adjacent matching parts, and its two ends are connected with the radial oil passages in two adjacent matching parts, an oil inlet passage is provided at any end of the crankshaft, the oil inlet passage is connected with the connecting oil passage, and axial oil passages are provided at both ends of the crankshaft, and the two ends of the axial oil passage are connected with the connecting oil passage and the outside of the end face of the crankshaft; The crankshaft is provided with at least two connecting rods, one end of which is rotatably connected to the mating portion, and the lubricating oil can enter the crankshaft from the oil inlet passage and enter the wall surface where the connecting rod and the mating portion cooperate along the connecting oil passage, and the lubricating oil can reach the bearing from the axial oil passage.

2. A crankshaft lubrication structure for a diaphragm compressor according to claim 1, characterized in that: The connecting rod is provided with a first connecting portion and a second connecting portion at both ends thereof, respectively. The first connecting portion of the connecting rod is rotatably connected to the matching portion, and the second connecting portion of the connecting rod is provided with a bearing.

3. A crankshaft lubrication structure for a diaphragm compressor according to claim 2, characterized in that: The connecting rod is provided with a channel extending in a direction perpendicular to the rotation axis, both ends of the channel are connected to the first connecting portion and the second connecting portion, and one end of the channel is connected to the radial oil passage.

4. The crankshaft lubrication structure of a diaphragm compressor according to claim 1, characterized in that: The mating portion includes a first pin portion and a second pin portion, and the radial oil passage includes a first radial oil passage provided in the first pin portion and a second radial oil passage provided in the second pin portion.

5. The crankshaft lubrication structure of a diaphragm compressor according to claim 1, characterized in that: The oil inlet passage includes a third radial oil passage and a third axial oil passage. The third radial oil passage extends in a direction perpendicular to the rotation axis and is connected to the third axial oil passage and the outside of the radial outer wall of the crankshaft.

6. The crankshaft lubrication structure of a diaphragm compressor according to claim 1, characterized in that: The crankshaft is provided with a first bearing and a second bearing at both ends respectively. The axial oil passage includes a first axial oil passage and a second axial oil passage. The first axial oil passage points to the end of the first bearing, and the second axial oil passage points to the end of the second bearing.

7. The crankshaft lubrication structure of a diaphragm compressor according to claim 5, characterized in that: A fourth radial oil passage is also provided in the crankshaft, and two ends of the fourth radial oil passage are respectively connected to the third axial oil passage and the connecting oil passage.

8. The crankshaft lubrication structure of a diaphragm compressor according to claim 1, characterized in that: An extending direction of the communicating oil passage is inclined with respect to the rotation axis.

9. The crankshaft lubrication structure of a diaphragm compressor according to claim 6, characterized in that: The ends of the first axial oil passage and the second axial oil passage close to the bearing are both connected to the outside of the end of the crankshaft, and nozzles are arranged on the ends.

10. The crankshaft lubrication structure of a diaphragm compressor according to claim 5, characterized in that: One end of the oil inlet passage provided on the crankshaft is plugged and mounted on a first mounting seat, and the first mounting seat has an oil inlet pipe, and the oil inlet pipe is connected to the third radial oil passage.

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