Symmetrical balance type oil scraping device for reciprocating compressor

Abstract

The utility model relates to an oil scraping device for a symmetrical balance type reciprocating compressor, which comprises a piston rod, an oil scraping rear shell and an oil scraping front shell are sequentially sleeved outside the piston rod, the oil scraping rear shell and the oil scraping front shell are fixedly connected through a bolt or a pin shaft, a plurality of oil scraping components are sleeved in the oil scraping front shell and on the piston rod, and the oil scraping components are fixedly connected with the piston rod through bolts or pin shafts. The oil scraping assembly is composed of two symmetrically-arranged semicircular shells, a first groove is formed in each semicircular shell, the top of each first groove is fixedly connected with a moving block connected through a first reset spring, the two sides of each moving block are fixedly connected with a plurality of longitudinally-arranged limiting blocks, and first limiting grooves matched with the limiting blocks for use are formed in the semicircular shells. A detachable oil scraping piece is arranged at the bottom of the movable block. The oil scraping device is reasonable in structure, the oil scraping piece can be rapidly installed and replaced through the arc-shaped sliding block and the sliding groove, and when the oil scraping piece goes wrong due to long-term use or other reasons, only the oil scraping piece needs to be independently replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to an oil scraping device for a symmetrically balanced reciprocating compressor. Background Art

[0002] In China, compressors are widely used in fields such as petroleum, chemical industry, automobiles, machinery, and food. The main components of a compressor are the body, crankshaft, connecting rod, piston group, air valve, oil scraping device, etc. Among them, the main function of the oil scraping device inside the compressor is to prevent lubricating oil from adhering to the piston rod and entering the cylinder interior, thereby causing problems such as oil pressure drop and lubrication failure. Existing oil scraping devices are usually of an integral structure, and when the oil scraping ring is damaged, it often needs to be replaced as a whole, resulting in a relatively high cost. Content of the Utility Model

[0003] In order to overcome the deficiencies of the above-mentioned existing problems, the utility model provides an oil scraping device for a symmetrically balanced reciprocating compressor.

[0004] The technical solution adopted by the utility model to solve its technical problems is: an oil scraping device for a symmetrically balanced reciprocating compressor, including a piston rod. An oil scraping rear housing and an oil scraping front housing are sequentially sleeved outside the piston rod. The oil scraping rear housing and the oil scraping front housing are fixedly connected by bolts or pins. Inside the oil scraping front housing and on the piston rod, a number of oil scraping components are sleeved. The oil scraping component is composed of two symmetrically arranged semi-cylindrical shells. A first groove is opened inside the semi-cylindrical shell. At the top of the first groove, a moving block connected by a first return spring is fixedly connected. On both sides of the moving block, a number of longitudinally arranged limiting blocks are fixedly connected. A first limiting groove for cooperating with the limiting blocks is opened inside the semi-cylindrical shell. At the bottom of the moving block, a detachable oil scraping blade is arranged. The top of the oil scraping blade fits the shape of the bottom of the moving block. Arc-shaped sliders are arranged at both ends of the oil scraping blade. Second grooves are opened on both sides of the lower section of the groove. A pressing block is arranged at the top of the second groove. The second groove and the pressing block are fixedly connected by a second return spring. The bottom surface of the pressing block and the bottom surface of the second groove form a sliding groove for the arc-shaped sliders to pass through. One side of the two semi-cylindrical shells is fixedly connected to the same retaining piece by a pin.

[0005] Preferably, a retaining block is fixedly connected to the inner side of the bottom of the moving block. A second limiting groove that fits the retaining block is opened on one side of the bottom of the arc-shaped slider. When the oil scraping blade is slid inward along the sliding groove until the second limiting groove fits the retaining block, the installation of the oil scraping blade is completed. The retaining block can effectively prevent the excessive displacement of the oil scraping blade during installation. And when the piston rod expands and contracts due to heat during operation, driving the oil scraping blade to move up and down, it can prevent the oil scraping blade from moving randomly, which may affect the oil scraping effect of the oil scraping blade.

[0006] Preferably, the length of the first groove is L1, and the outer diameter of the moving block is L2. L1 is equal to L2 to prevent the oil scraping device from shaking during use.

[0007] Preferably, a buckle and slot structure is provided at the joint of the two semi-cylindrical shells. Buckles are fixedly connected to the lower sides of both sides of one semi-cylindrical shell, and slots are fixedly connected to the upper sides of both sides of the other semi-cylindrical shell. During installation, preliminary positioning is first completed through the buckles and slots, and finally, the retaining piece and the two semi-cylindrical shells are fixed by a pin shaft to complete the installation.

[0008] Preferably, a sealing ring is sleeved inside the rear shell, which can further improve the oil scraping effect and reduce the possibility of air or other impurities entering the cylinder.

[0009] The beneficial effects of the present utility model are as follows: the oil scraping blade can be quickly installed and replaced through the arc-shaped slider and the second chute. And when the oil scraping blade has problems due to long-term use or other reasons, only the oil scraping blade needs to be replaced separately. During installation, the oil scraping device can be quickly and conveniently installed or disassembled through the buckle and slot structure and the retaining piece. In addition, the length of the first groove is equal to the outer diameter of the moving block, which can prevent the oil scraping device from shaking during operation. A sealing ring is sleeved inside the rear shell, which can further improve the oil scraping effect and reduce the possibility of air or other impurities entering the cylinder. Description of the Drawings

[0010] The present utility model will be further described below with reference to the drawings and embodiments.

[0011] Figure 1 is a cross-sectional view of the present utility model;

[0012] Figure 2 is an exploded view of the oil scraping assembly of the present utility model;

[0013] Figure 3 is Figure 2 the sectional view and exploded view in the A-A direction in

[0014] In the figure, 1, piston rod; 2, rear oil scraping shell; 3, front oil scraping shell; 4, oil scraping assembly; 5, semi-cylindrical shell; 6, first groove; 7, first return spring; 8, moving block; 9, limiting block; 10, first limiting groove; 11, oil scraping blade; 12, arc-shaped slider; 13, second groove; 14, pressing block; 15, second return spring; 16, chute; 17, stop block; 18, second limiting groove; 19, retaining piece; 20, buckle; 21, slot; 22, sealing ring. Detailed Embodiments

[0015] All features disclosed in this specification, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any manner.

[0016] Any feature disclosed in this specification (including any additional claims, abstract, and drawings), unless specifically stated, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically stated, each feature is only an example of a series of equivalent or similar features.

[0017] As Figures 1-3 shown, an oil scraping device for a symmetrically balanced reciprocating compressor includes a piston rod 1. A post-oil scraping housing 2 and a pre-oil scraping housing 3 are sequentially sleeved outside the piston rod 1. The post-oil scraping housing 2 and the pre-oil scraping housing 3 are fixedly connected by bolts or pins. A number of oil scraping assemblies 4 are sleeved on the piston rod 1 inside the pre-oil scraping housing 3. The oil scraping assembly 4 is composed of two symmetrically arranged semi-cylindrical housings 5. A first groove 6 is opened inside the semi-cylindrical housing 5. A moving block 8 connected by a first return spring 7 is fixedly connected to the top of the first groove 6. A number of longitudinally arranged limiting blocks 9 are fixedly connected to both sides of the moving block 8. A first limiting groove 10 for cooperating with the limiting block 9 is opened inside the semi-cylindrical housing 5. A detachable oil scraping blade 11 is arranged at the bottom of the moving block 8. The top of the oil scraping blade 11 fits the shape of the bottom of the moving block 8. Arc-shaped sliders 12 are arranged at both ends of the oil scraping blade 11. Second grooves 13 are opened on both sides of the lower section of the groove 6. A pressing block 14 is arranged at the top of the second groove 13. The second groove 13 and the pressing block 14 are fixedly connected by a second return spring 15. A sliding groove 16 for the arc-shaped slider 12 to pass through is formed between the bottom surface of the pressing block 14 and the bottom surface of the second groove 13. One side of the two semi-cylindrical housings 5 is fixedly connected to the same retaining piece 19 by a pin.

[0018] A retaining block 17 is fixedly connected to the inner side of the bottom of the moving block 8. A second limiting groove 18 that fits the retaining block 17 is opened on one side of the bottom of the arc-shaped slider 12. When the oil scraping blade 11 is slid inward along the sliding groove 16 until the second limiting groove 18 fits the retaining block 17, the installation of the oil scraping blade 11 is completed. The retaining block 17 can effectively prevent the excessive displacement of the oil scraping blade 11 during installation, and when the piston rod 1 expands and contracts due to thermal expansion and contraction during operation, driving the oil scraping blade 11 to move up and down, it can prevent the oil scraping blade 11 from moving randomly, which may affect the oil scraping effect of the oil scraping blade 11.

[0019] The length of the first groove 6 is L1, and the outer diameter of the moving block 8 is L2. The lengths of L1 and L2 are equal to prevent the oil scraping device from shaking during use.

[0020] A snap-fastening groove structure is provided at the joint of the two semi-circular shells 5. On both sides below of one semi-circular shell 5, snap fasteners 20 are fixedly connected. On both sides above of the other semi-circular shell 5, grooves 21 are fixedly connected. During installation, initial positioning is first completed through the snap fasteners 20 and the grooves 21, and finally, the retaining piece 19 is fixed to the two semi-circular shells 5 through a pin shaft to complete the installation.

[0021] A sealing ring 22 is sleeved inside the rear shell 2, which can further improve the oil scraping effect and reduce the possibility of air or other impurities entering the cylinder. Specific embodiments

[0022] During installation, when the oil scraping piece 11 is slid inward along the sliding groove 16 until the second limiting groove 18 fits with the block 17, the installation of the oil scraping piece 11 is completed. Subsequently, the two semi-circular shells 5 are joined and pressed, the snap fasteners 20 are engaged with the grooves 21, and finally, the retaining piece 19 is fixed to the two semi-circular shells 5 through a pin shaft to complete the installation.

[0023] This design is ingenious. The oil scraping piece can be quickly installed and replaced through the arc-shaped slider and the sliding groove. And when the oil scraping piece has problems due to long-term use or other reasons, only the oil scraping piece needs to be replaced separately. During installation, the oil scraping device can be quickly and conveniently installed or disassembled through the snap-fastening groove structure and the retaining piece. In addition, the length of the first groove is equal to the outer diameter of the moving block, which can prevent the oil scraping device from shaking during operation. A sealing ring is sleeved inside the rear shell, which can further improve the oil scraping effect and reduce the possibility of air or other impurities entering the cylinder.

[0024] The present utility model is not limited to the foregoing specific embodiments. The present utility model extends to any new feature or any new combination disclosed in this specification, as well as any new method or process step or any new combination disclosed.

Claims

1. An oil scraping device for a symmetrically balanced reciprocating compressor, characterized in that: It includes a piston rod (1). A post-scraping oil housing (2) and a pre-scraping oil housing (3) are sequentially sleeved outside the piston rod (1). The post-scraping oil housing (2) and the pre-scraping oil housing (3) are fixedly connected by bolts or pin shafts. A number of scraping oil assemblies (4) are sleeved on the piston rod (1) inside the pre-scraping oil housing (3). The scraping oil assembly (4) is composed of two symmetrically arranged semi-cylindrical housings (5). A first groove (6) is formed inside the semi-cylindrical housing (5). A moving block (8) connected by a first return spring (7) is fixedly connected to the top of the first groove (6). A number of longitudinally arranged limiting blocks (9) are fixedly connected to both sides of the moving block (8). A first limiting groove (10) for cooperating with the limiting block (9) is formed inside the semi-cylindrical housing (5). A detachable scraping oil piece (11) is arranged at the bottom of the moving block (8). The top of the scraping oil piece (11) fits the shape of the bottom of the moving block (8). Arc-shaped sliders (12) are arranged at both ends of the scraping oil piece (11). Second grooves (13) are formed on both sides of the lower section of the groove (6). A pressing block (14) is arranged at the top of the second groove (13). The second groove (13) and the pressing block (14) are fixedly connected by a second return spring (15). A sliding groove (16) for the arc-shaped slider (12) to pass through is formed between the bottom surface of the pressing block (14) and the bottom surface of the second groove (13). One side of each of the two semi-cylindrical housings (5) is fixedly connected to the same retaining piece (19) by a pin shaft.

2. The oil scraping device for a symmetric balance type reciprocating compressor according to claim 1, wherein: A retaining block (17) is fixedly connected to the inner side of the bottom of the moving block (8). A second limiting groove (18) for fitting the retaining block (17) is formed on one side of the bottom of the arc-shaped slider (12).

3. The oil scraping device for a symmetrically balanced reciprocating compressor according to claim 1, characterized in that: The length of the first groove (6) is L1, and the outer diameter of the moving block (8) is L2. The lengths of L1 and L2 are equal.

4. A oil scraping device for a symmetrically balanced reciprocating compressor according to claim 1, characterized in that: A snap-fastening groove structure is arranged at the joint of the two semi-cylindrical housings (5). Snap-fastening members (20) are fixedly connected to the lower parts of both sides of one semi-cylindrical housing (5), and clamping grooves (21) are fixedly connected to the upper parts of both sides of the other semi-cylindrical housing (5).

5. The oil scraping device for a symmetrically balanced reciprocating compressor according to claim 1, characterized in that: A sealing ring (22) is sleeved inside the rear housing (2).

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