Transmission structure and diaphragm compressor

Abstract

The transmission structure comprises a connecting rod and a crosshead, the connecting rod is provided with a connecting part, the crosshead is provided with a fixing pin, the fixing pin is connected to the connecting part in an inserted mode, and a transmission assembly is arranged on the radial outer wall of the fixing pin. The transmission assembly is matched with the connecting part to achieve rotation of the connecting part around the rotating axis on the fixing pin, the crosshead is provided with an oil inlet channel, the fixing pin is provided with an axial oil way and a radial oil way communicated with the oil inlet channel, and the radial oil way comprises a first oil way and a second oil way. Lubricating oil can enter from the oil inlet channel and sequentially pass through the first oil way, the axial oil way and the second oil way to enter the transmission assembly, the lubricating function is achieved, rotating connection is achieved by arranging the transmission assembly, abrasion and loosening caused by the fact that the fixing pin directly participates in friction are avoided, and the good lubricating function is achieved by arranging the multiple oil ways; and the crosshead can adapt to a high-speed application scene.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a transmission structure and a diaphragm compressor. Background Art

[0002] A diaphragm compressor is a positive displacement compressor that uses a diaphragm to separate the oil side and the gas side. It is widely used in the hydrogen energy industry. In order to respond to development needs, high-speed diaphragm compressors are the future technology development direction, but the current transmission structure is difficult to meet the high-speed requirements. Since the air pressure is high when the compressor is working, the current reverse clearance between the connecting rod and the crosshead pin is insufficient, and the wall surface between the crosshead pin and the connecting rod is not lubricated enough. Long-term high-speed operation will cause wear, resulting in insufficient life and unstable operation. On the other hand, the elastic retaining rings installed at both ends of the traditional crosshead pin are prone to deformation and damage during long-term operation, which in turn causes the connection between the connecting rod and the crosshead to loosen. In addition, this floating pin structure is prone to micro-motion or fatigue wear on the surface of the crosshead pin, and is not suitable for high-speed application scenarios. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a transmission structure and a diaphragm compressor, which can improve lubrication ability and operation stability, thereby facilitating increasing the speed of the compressor.

[0004] A transmission structure according to an embodiment of the first aspect of the utility model includes:

[0005] A connecting rod having a connecting portion;

[0006] The crosshead is provided with a fixedly installed fixing pin, which is inserted into the connecting part and has a transmission assembly on its radial outer wall. The transmission assembly cooperates with the connecting part to realize the connection part rotating around the rotation axis on the fixing pin. The crosshead is provided with an oil inlet channel, and the fixing pin is provided with an axial oil circuit and a radial oil circuit connected with the oil inlet channel. The radial oil circuit includes a first oil circuit and a second oil circuit. Lubricating oil can enter from the oil inlet channel and pass through the first oil circuit, the axial oil circuit and the second oil circuit in sequence into the transmission assembly to realize the lubrication function.

[0007] A transmission structure according to an embodiment of the first aspect of the utility model has at least the following beneficial effects: this embodiment is provided with a connecting rod and a crosshead, the connecting rod is provided with a connecting portion, the crosshead is provided with a fixed pin, the fixed pin is inserted into the connecting portion and its radial outer wall is provided with a transmission assembly, the transmission assembly cooperates with the connecting portion to realize the rotation of the connecting portion around the rotation axis on the fixed pin, the crosshead is provided with an oil inlet channel, the fixed pin is provided with an axial oil circuit and a radial oil circuit connected to the oil inlet channel, the radial oil circuit includes a first oil circuit and a second oil circuit, the lubricating oil can enter from the oil inlet channel and pass through the first oil circuit, the axial oil circuit and the second oil circuit in sequence into the transmission assembly to realize the lubrication function, and the rotational connection is realized by setting the transmission assembly to avoid the fixed pin directly participating in the friction and causing wear and loosening, and a good lubrication function is realized by setting multiple oil circuits, so that the crosshead can adapt to high-speed application scenarios.

[0008] According to an embodiment of the first aspect of the utility model, at least two bearings are arranged in the transmission assembly, and a spacer is arranged between two adjacent bearings to separate the two bearings.

[0009] According to the embodiment of the first aspect of the utility model, the spacer is provided with a radial oil hole penetrating in the radial direction and an axial oil hole penetrating in the axial direction, the radial oil hole is connected to the axial oil hole, and the radial oil hole is connected to the second oil passage.

[0010] According to the embodiment of the first aspect of the utility model, an inner groove is provided on the inner wall of the spacer along a direction perpendicular to the rotation axis, and side grooves are provided on both sides along the axial direction of the spacer, the inner groove and the side grooves both extend along the circumferential direction of the spacer, the inner groove is connected to the radial oil hole, and the side groove is connected to the axial oil hole, so that the lubricating oil can enter the transmission assembly through the axial oil hole.

[0011] According to an embodiment of the first aspect of the utility model, the crosshead is provided with a mounting hole for inserting and installing a fixing pin, and an inner wall of the mounting hole is provided with a connecting groove extending along its circumference, and the connecting groove is connected to the first oil circuit.

[0012] According to an embodiment of the first aspect of the utility model, at least two radial oil passages are provided, an angle is formed between two adjacent radial oil passages, and at least two radial oil passages pass through the fixing pin along a direction perpendicular to the rotation axis.

[0013] According to the embodiment of the first aspect of the utility model, a step is provided at one end of the fixing pin, and a positioning sleeve is inserted into the mounting hole, the positioning sleeve is fixed to the end of the fixing pin away from the step, and the step and the positioning sleeve are respectively in contact with two sides of the transmission assembly.

[0014] According to an embodiment of the first aspect of the utility model, a recessed oil guide groove is provided on the outer wall of the crosshead, and the oil guide groove is connected to the oil inlet channel.

[0015] According to the embodiment of the first aspect of the utility model, a fastening screw is provided in the cross head, and the fastening screw is screwed to the radial outer wall of the fixing pin to achieve installation and positioning of the fixing pin in the cross head.

[0016] According to an embodiment of the second aspect of the utility model, a diaphragm compressor is provided, comprising the above-mentioned transmission structure.

[0017] A diaphragm compressor according to the second aspect of the present utility model has at least the following beneficial effects:

[0018] Compared with the prior art, a transmission structure and a diaphragm compressor are provided with a fixedly installed fixing pin in a crosshead, the connecting portion of the connecting rod is rotatably connected with the fixing pin through a transmission assembly, and the crosshead is provided with an oil inlet passage, the fixing pin is provided with an axial oil passage and a radial oil passage communicating with the oil inlet passage, the radial oil passage includes a first oil passage and a second oil passage, and lubricating oil can enter from the oil inlet passage and sequentially pass through the first oil passage, the axial oil passage and the second oil passage into the transmission assembly.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 It is an axonometric view of a transmission structure in an embodiment of the first aspect of the utility model;

[0022] Figure 2 A first cross-sectional view of a transmission structure in an embodiment of the first aspect of the utility model;

[0023] Figure 3 A second cross-sectional view of a transmission structure in an embodiment of the first aspect of the utility model;

[0024] Figure 4 A third cross-sectional view of a transmission structure in an embodiment of the first aspect of the utility model;

[0025] Figure 5 for Figure 4 A magnified view of center.

[0026] Reference numerals:

[0027] Connecting rod 100; connecting portion 101; bearing 102; outer ring 103; inner ring 104; roller 105; positioning sleeve 106; limiting portion 107;

[0028] Cross head 110; mounting hole 111; oil inlet channel 112; oil guide groove 113; fastening screw 114; connecting groove 115;

[0029] Fixed pin 120; axial oil passage 121; first oil passage 122; second oil passage 123; step 124;

[0030] Spacer 130; inner groove 131; side groove 132; radial oil hole 133; axial oil hole 134. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] Reference Figure 1 A transmission structure in an embodiment of the first aspect of the utility model includes a connecting rod 100 and a crosshead 110. The connecting rod 100 is provided with a connecting portion 101, and the connecting portion 101 is rotatably connected to the crosshead 110. The crosshead 110 is provided with a fixing pin 120. The fixing pin 120 is inserted into the connecting portion 101 and a transmission component is provided on its radial outer wall. The transmission component is located between the connecting portion 101 and the fixing pin 120. The transmission component cooperates with the connecting portion 101 to realize the rotation of the connecting portion 101 around the rotation axis on the fixing pin 120.

[0036] Reference Figure 2 A step 124 is provided at one end of the fixing pin 120, and a positioning sleeve 106 is inserted into the mounting hole 111. The positioning sleeve 106 is fixed to the end of the fixing pin 120 away from the step 124. The step 124 and the positioning sleeve 106 are respectively abutted against the two sides of the transmission assembly. It can be understood that the outer diameter of the step 124 is larger than the part of the fixing pin 120 that cooperates with the transmission assembly, and the end of the positioning sleeve 106 abuts against the side wall of the transmission assembly away from the step 124, thereby realizing the axial positioning of the transmission assembly on the fixing pin 120.

[0037] Specifically, the transmission assembly includes a bearing 102, and the bearing 102 includes an inner ring 104, an outer ring 103, and a roller 105 located between the outer ring 103 and the inner ring 104. The inner ring 104 is sleeved in the fixing pin 120, and the outer ring 103 cooperates with the connecting portion 101 to achieve a rotational connection between the connecting portion 101 and the fixing pin 120. It is understandable that two bearings 102 are provided, and tapered roller 105 bearings 102 are used. The inclination directions of the rollers 105 on the two bearings 102 are opposite, which helps to improve the ability to withstand axial forces. It is understandable that the step 124 abuts against the axial outer wall of one of the bearings 102, and the end face of the positioning sleeve 106 abuts against the outer wall of the other bearing 102 away from the step 124, so as to achieve the axial positioning of the bearing 102 in the fixing pin 120. Further, referring to Figure 5 The connection part 101 has a limiting part 107, which is located between the two bearings 102, and the two sides of the limiting part 107 are respectively in contact with the side walls of the outer rings 103 of the two bearings 102, so as to achieve the axial positioning of the connection part 101 and the fixing pin 120. It can be understood that by setting a transmission assembly using the bearings 102 to achieve a rotational connection, the fixing pin 120 is prevented from directly participating in friction and causing wear and loosening, and by setting multiple oil circuits to achieve a good lubrication function, the crosshead 110 can adapt to high-speed application scenarios.

[0038] It can be understood that the crosshead 110 has a mounting hole 111 for mounting a fixing pin 120, the radial outer wall of the fixing pin 120 cooperates with the inner wall of the mounting hole 111, the crosshead 110 is provided with an oil inlet channel 112, the oil inlet channel 112 is connected to the outer wall of the crosshead 110 and the mounting hole 111, the fixing pin 120 is provided with an axial oil passage 121 and a radial oil passage connected to the oil inlet passage 112, the radial oil passage includes a first oil passage 122 and a second oil passage 123, the lubricating oil can enter from the oil inlet passage 112 and pass through the first oil passage 122, the axial oil passage 121 and the second oil passage 123 in sequence into the transmission assembly to achieve the lubrication function.

[0039] Reference Figure 3It can be understood that the oil inlet channel 112 extends along the radial direction of the fixed pin 120, and the first oil circuit 122 is connected to the oil inlet channel 112. Furthermore, at least two radial oil circuits are provided, and there is an angle between the two adjacent radial oil circuits. In the direction perpendicular to the rotation axis, at least two radial oil circuits pass through the rotation axis of the fixed pin 120 and penetrate the fixed pin 120. It can be understood that at least two first oil circuits 122 and two second oil circuits 123 are provided, and both the first oil circuit 122 and the second oil circuit 123 pass through the rotation axis of the fixed pin 120, and there is an angle between the two adjacent first oil circuits 122 and the two adjacent second oil circuits 123. Furthermore, a connecting groove 115 extending along the circumference thereof is provided on the inner wall of the mounting hole 111 of the crosshead 110, and the connecting groove 115 is connected to the first oil circuit 122. The connecting groove 115 can enable at least two first oil circuits 122 to be connected to each other. It can be understood that during operation, the lubricating oil enters the connecting groove 115 from the oil inlet channel 112, and passes through the connecting groove 115 so that the lubricating oil can be injected into multiple first oil circuits 122. By providing the connecting groove 115, the fixing pin 120 does not need to be aligned with the positions of the oil inlet channel 112 and the first oil circuit 122 during installation, thereby improving the convenience of installation. In addition, the connecting groove 115 can store a certain amount of lubricating oil, which helps to improve the smoothness.

[0040] Reference Figure 4 , a spacer 130 is provided between the two bearings 102, and along the direction of the rotation axis, both sides of the spacer 130 abut against the side wall of the inner ring 104 of the bearing 102, and further, a radial oil hole 133 penetrating in the radial direction and an axial oil hole 134 penetrating in the axial direction are provided on the spacer 130, and the radial oil hole 133 is connected to the axial oil hole 134, and the radial oil hole 133 is connected to the second oil passage 123, and the axial oil hole 134 corresponds to the position of the roller 105. It can be understood that the lubricating oil enters the second oil passage 123 from the axial oil passage 121. And passes through the radial oil hole 133 and the axial oil hole 134 in sequence, so that the lubricating oil can reach the roller 105, lubricate and cool the bearing 102, and help improve the stability and durability of the crosshead 110 in high-speed working conditions.

[0041] Furthermore, an inner groove 131 is provided on the inner wall of the spacer 130 in a direction perpendicular to the axis of rotation, and side grooves 132 are provided on both sides of the axial direction of the spacer 130. The inner groove 131 and the side grooves 132 both extend along the circumferential direction of the spacer 130. The inner groove 131 is connected to the radial oil hole 133, and the side groove 132 is connected to the axial oil hole 134, so that the lubricating oil can enter the transmission assembly through the axial oil hole 134. It can be understood that the inner groove 131 and the side groove 132 can both store a certain amount of lubricating oil, and during actual operation, a good supply of lubricating oil can be guaranteed to meet the lubrication requirements.

[0042] Furthermore, a fastening screw 114 is provided in the crosshead 110, and the fastening screw 114 is screwed to the radial outer wall of the fixing pin 120 to achieve installation and positioning of the fixing pin 120 in the crosshead 110. Specifically, the fastening screw 114 has a conical surface, and the conical surface can be plugged into any of the first oil passages 122, so as to achieve circumferential positioning of the fixing pin 120 in the crosshead 110.

[0043] Further, a concave oil guide groove 113 is provided on the outer wall of the crosshead 110, and the oil guide groove 113 is connected to the oil inlet channel 112. There are several oil guide grooves 113, and the oil guide grooves 113 can extend along the radial and axial directions of the fixed pin 120. When working, the crosshead 110 reciprocates, and can bring the lubricating oil into the oil guide groove 113, and transport the lubricating oil to the fixed pin 120 and the bearing 102 through the oil inlet channel 112 to achieve the lubrication function. It can be understood that the length direction of the oil guide groove 113 includes the radial direction and the axial direction along the fixed pin 120. Along the length direction of the oil guide groove 113, multiple oil inlet channels 112 can be set, which helps to improve the delivery efficiency of the lubricating oil to meet the lubrication requirements under high-speed working conditions. A diaphragm compressor according to an embodiment of the second aspect of the utility model includes the above-mentioned transmission structure. Since the diaphragm compressor includes all the technical features in the above-mentioned transmission structure, the diaphragm compressor also has all the beneficial effects in the above-mentioned transmission structure.

[0044] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A transmission structure, characterized in that: include: A connecting rod having a connecting portion; A crosshead is provided with a fixedly installed fixing pin, the fixing pin is inserted into the connecting part and a transmission assembly is provided on its radial outer wall, the transmission assembly cooperates with the connecting part to realize the connection part rotating around the rotation axis on the fixing pin, the crosshead is provided with an oil inlet channel, the fixing pin is provided with an axial oil circuit and a radial oil circuit connected with the oil inlet channel, the radial oil circuit includes a first oil circuit and a second oil circuit, and the lubricating oil can enter from the oil inlet channel and pass through the first oil circuit, the axial oil circuit and the second oil circuit in sequence into the transmission assembly to realize the lubrication function.

2. A transmission structure according to claim 1, characterized in that: At least two bearings are arranged in the transmission assembly, and a spacer is arranged between two adjacent bearings to separate the two bearings.

3. A transmission structure according to claim 2, characterized in that: The spacer is provided with a radial oil hole penetrating in the radial direction and an axial oil hole penetrating in the axial direction, the radial oil hole is connected to the axial oil hole, and the radial oil hole is connected to the second oil passage.

4. A transmission structure according to claim 3, characterized in that: An inner groove is provided on the inner wall of the spacer along a direction perpendicular to the rotation axis, and side grooves are provided on both sides along the axial direction of the spacer, the inner groove and the side grooves both extend along the circumferential direction of the spacer, the inner groove is connected to the radial oil hole, and the side groove is connected to the axial oil hole, so that the lubricating oil can enter the transmission assembly through the axial oil hole.

5. A transmission structure according to claim 1, characterized in that: The crosshead is provided with a mounting hole for inserting and mounting the fixing pin, and the inner wall of the mounting hole is provided with a connecting groove extending along the circumference thereof, and the connecting groove is connected with the first oil circuit.

6. A transmission structure according to claim 1, characterized in that: At least two of the first oil passage and the second oil passage are provided, and an angle is formed between two adjacent radial oil passages. At least two radial oil passages run through the fixing pin along a direction perpendicular to the rotation axis.

7. A transmission structure according to claim 5, characterized in that: A step is provided at one end of the fixing pin, and a positioning sleeve is inserted into the mounting hole. The positioning sleeve is fixed to an end of the fixing pin away from the step, and the step and the positioning sleeve are respectively in contact with two sides of the transmission assembly.

8. A transmission structure according to claim 1, characterized in that: An oil guide groove is provided on the outer wall of the crosshead, and the oil guide groove is connected to the oil inlet channel.

9. A transmission structure according to claim 7, characterized in that: A fastening screw is arranged in the cross head, and the fastening screw is screwed to the radial outer wall of the fixing pin to realize the installation and positioning of the fixing pin in the cross head.

10. A diaphragm compressor, characterized in that The invention comprises a transmission structure as claimed in any one of claims 1 to 9.

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