Improved reciprocating compressor

Abstract

The utility model belongs to the technical field of compressors, and particularly relates to an improved reciprocating compressor which comprises a crankcase, middle bodies oppositely arranged on the two sides of the crankcase in parallel and an air cylinder connected with the other ends of the middle bodies. A crosshead and a piston rod are arranged in the middle body, the other end of the connecting rod is connected with the crosshead, and one end of the piston rod is connected with the crosshead, so that the oil scraping efficiency of the piston rod is improved while the stability of the fixing ring is kept through the arrangement of the supporting rod; meanwhile, the multiple fixing rings are clamped on different portions of the surface of the piston rod in a wrapped mode, the contact area between the single fixing ring and the piston rod is reduced so that abrasion to the piston rod can be reduced, and then a user can increase or decrease the number of the fixing rings according to the actual situation so that different oil scraping effects can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of compressors, and particularly relates to an improved reciprocating compressor. Background Art

[0002] A reciprocating compressor refers to a compressor that realizes the pressurization and transportation of gas through the reciprocating motion of a piston in a cylinder, causing the volume of the cylinder to change periodically. The power system is linked with the crankshaft of the compressor. The crankshaft drives the connecting rod, and the connecting rod drives the piston to make reciprocating motion. The reciprocating motion of the piston causes the volume in the cylinder to change. When the piston moves to one side, the volume of the cylinder increases, the intake valve opens, the exhaust valve closes, and air is sucked in to complete the intake process. When the piston moves to the other side, the volume of the cylinder decreases, the exhaust valve opens, and the intake valve closes to complete the gas compression process.

[0003] Currently, when a reciprocating compressor operates, the crankshaft drives the piston rod to reciprocate between the crankcase and the cylinder. The lubricating oil in the crankcase will splash onto the piston rod along with the high-speed movement of the crankshaft. Therefore, an oil scraping ring is used to scrape the leaked lubricating oil attached to the piston rod. Most of the existing oil scraping rings are directly sleeved on the piston rod. When the piston rod starts to expand and contract, oil scraping is carried out through the relative movement between the oil scraping ring and the piston rod, with low efficiency. At the same time, in order to improve the oil scraping efficiency, multiple scraping rings are usually provided inside the existing oil scraping ring. However, in this way, the friction area between the piston rod and the oil scraping ring will increase, increasing the wear of the piston rod. Content of the Utility Model

[0004] In view of this, the utility model provides an improved reciprocating compressor. The purpose is to enable the fixed ring to improve the oil scraping efficiency of the piston rod while maintaining stability through the setting of the support rod. At the same time, by clamping several fixed rings at different parts of the surface of the piston rod, the contact area between a single fixed ring and the piston rod is reduced, thereby reducing the wear on the piston rod. Secondly, the user can increase or decrease the number of fixed rings according to the actual situation to achieve different oil scraping effects.

[0005] The technical solution adopted by the utility model is as follows:

[0006] An improved reciprocating compressor includes a crankcase, middle bodies arranged in parallel on both sides of the crankcase, and a cylinder connected to the other end of the middle body. Among them, a crankshaft capable of performing circular rotation is provided inside the crankcase, and connecting rods are arranged in parallel on the crankshaft. A crosshead and a piston rod are provided inside the middle body. The other end of the connecting rod is connected to the crosshead, one end of the piston rod is connected to the crosshead, and the other end of the piston rod is provided with a piston head extending into the cylinder. A reinforcing layer is also provided inside the middle body. A plurality of fixing rings surrounding the piston rod are provided inside the reinforcing layer. Oil return grooves parallel to each other and scraping rings fitting the piston rod are provided inside the fixing rings. An oil return tank is provided inside the reinforcing layer. An oil inlet is opened on one side of the oil return tank facing the fixing ring. A support rod is provided between the oil inlet and the fixing ring. A flow channel communicating with the oil inlet and the oil return groove is provided inside the support rod.

[0007] As a preferred technical solution, the oil inlet is in a convex shape corresponding to the opening of the flow channel.

[0008] Furthermore, a connecting plate is provided on one side of the support rod in contact with the oil inlet, and the connecting plate is connected to the reinforcing layer.

[0009] Furthermore, at least two fixing rings are provided, and a plurality of fixing rings are distributed symmetrically in parallel inside the reinforcing layer.

[0010] Furthermore, the fixing ring includes two opposing half rings spliced together. Among them, corresponding protrusions and grooves are provided at the splicing position of the two half rings.

[0011] Furthermore, a packing ring is provided at the connection between the middle body and the cylinder, and the piston rod is movably inserted through the packing ring.

[0012] Furthermore, a plurality of wear-resistant rings are sleeved on the surface of the piston head.

[0013] Furthermore, a valve assembly is provided on the cylinder. Among them, the valve assembly includes an intake valve and an exhaust valve.

[0014] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present utility model are as follows:

[0015] Through the setting of the support rod, the fixing ring can improve the oil scraping efficiency of the piston rod while maintaining stability. At the same time, by sandwiching a plurality of fixing rings at different parts of the surface of the piston rod, the contact area between a single fixing ring and the piston rod is reduced, so as to reduce the wear of the piston rod. Secondly, the user can increase or decrease the number of fixing rings according to the actual situation to achieve different oil scraping effects. Description of the Drawings

[0016] The present utility model will be described by way of examples and with reference to the drawings, where:

[0017] Figure 1 This is a schematic structural diagram of an improved reciprocating compressor provided by the present utility model;

[0018] Figure 2 This is a schematic internal structure diagram of the improved reciprocating compressor provided by the present utility model;

[0019] Figure 3 This is a schematic structural diagram of the fixing ring provided by the present utility model;

[0020] Figure 4 This is a schematic structural diagram of the scraping ring and the oil return groove provided by the present utility model;

[0021] Figure 5 This is a schematic structural diagram of the reflux groove and the flow channel provided by the present utility model;

[0022] Figure 6 This is a schematic structural diagram of the reinforcement layer provided by the present utility model.

[0023] Crankcase - 1; Intermediate body - 2; Cylinder - 3; Crosshead - 4; Piston rod - 5; Reinforcement layer - 6; Fixing ring - 7; Piston head - 8; Connecting plate - 9; Flow channel - 10; Oil return groove - 11; Scraping ring - 12; Oil inlet - 13; Oil return tank - 14; Packing ring - 15; Support rod - 16. Specific embodiments

[0024] Next, in combination with the accompanying drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0025] Embodiment 1

[0026] In the prior art, the oil scraping ring is generally installed by directly sleeving the piston rod. When the piston rod makes telescopic movements, the oil scraping operation is performed relying on the relative movement between the oil scraping ring and the piston rod. However, the oil scraping efficiency of this method is relatively low. In order to improve the oil scraping efficiency, currently, multiple scraping rings are added inside some oil scraping rings to improve the oil scraping effect. However, this also leads to a significant increase in the friction area between the piston rod and the oil scraping ring, thereby exacerbating the wear degree of the piston rod.

[0027] Therefore, in order to solve the problems of low oil scraping efficiency of the existing oil scraping ring and high wear rate of the piston rod, and to achieve the functions of improving the oil scraping efficiency and reducing the wear rate of the piston rod, the present utility model discloses an improved reciprocating compressor. Refer to Figures 1 - 5, including a crankcase 1, middle bodies 2 arranged in parallel on both sides of the crankcase 1, and a cylinder 3 connected to the other end of the middle body 2. Among them, a crankshaft capable of circular rotation is provided inside the crankcase 1, and connecting rods are arranged in parallel on the crankshaft. A crosshead 4 and a piston rod 5 are provided inside the middle body 2. The other end of the connecting rod is connected to the crosshead 4. One end of the piston rod 5 is connected to the crosshead 4, and the other end of the piston rod 5 is provided with a piston head 8 extending into the cylinder 3. Specifically, a reinforcing layer 6 is further provided inside the middle body 2. A plurality of fixing rings 7 are arranged around the piston rod 5 inside the reinforcing layer 6. An oil return groove 11 and a scraping ring 12 that fits the piston rod 5 are provided in parallel on the inner side of the fixing ring 7. An oil return tank 14 is provided inside the reinforcing layer 6. An oil inlet 13 is opened on one side of the oil return tank 14 facing the fixing ring 7. A support rod 16 is provided between the oil inlet 13 and the fixing ring 7. A flow channel 10 communicating with the oil inlet 13 and the oil return groove 11 is provided inside the support rod 16;

[0028] In this embodiment, by adding a support rod 16 between the fixing ring 7 and the reinforcing layer 6, the fixing ring 7 can be supported while clamping the piston rod 5, so that the scraping ring 12 inside the fixing ring 7 can fit the surface of the piston rod 5 more closely. When the piston rod 5 starts to expand and contract, the fixing ring 7 remains stationary and scrapes the oil on the surface of the piston rod 5 through the scraping ring 12. Subsequently, the scraped oil can enter the oil return tank 14 through the oil return groove 11 and the flow channel 10, thereby improving the oil scraping efficiency of the piston rod 5 while maintaining the stability of the fixing ring 7;

[0029] Secondly, while fixing the fixing ring 7, the support rod 16 can also play a role in limiting the piston rod 5 to avoid the situation of the piston rod 5 swinging up and down;

[0030] In this embodiment, a plurality of fixing rings 7 are clamped at different parts of the surface of the piston rod 5. Among them, an oil scraping ring 12 and a corresponding oil return groove 11 are provided on the inner side of each fixing ring 7. Through this setting, the contact area between a single fixing ring 7 and the piston rod 5 can be reduced, thereby reducing the wear on the piston rod 5. At the same time, the user can increase or decrease the number of fixing rings 7 according to the actual situation to achieve different oil scraping effects.

[0031] In this embodiment, at least two fixing rings 7 are provided, and a plurality of fixing rings 7 are distributed symmetrically in parallel inside the reinforcing layer 6. Through this setting, the fixing ring 7 can reduce the wear degree on the piston rod 5 while maintaining the oil scraping efficiency, thereby saving the maintenance cost of the piston rod 5.

[0032] In this embodiment, an oil pipe is provided on the oil return tank 14, and the oil pipe penetrates inside the crankcase 1.

[0033] In this embodiment, the crankshaft is connected to an external motor, and the motor can drive the crankshaft to rotate in a circle, thereby driving the piston rod 5 to perform a horizontal reciprocating circular motion within the middle body 2.

[0034] In this embodiment, due to the arrangement of the flow channel 10, the support rod 16 has a hollow structure. This design not only reduces the weight of the support rod 16 and the energy consumption of the entire compressor, but also ensures the smooth flow of the oil;

[0035] Among them, the opening of the flow channel 10 inside the support rod 16 towards the fixed ring 7 is larger than the opening sleeved on the oil inlet 13, so that the flow channel 10 can be arranged in a structure that is wider at the front and narrower at the back, thereby ensuring that after the scraping ring 12 scrapes the oil on the surface of the piston rod 5, the oil can quickly and smoothly enter the oil return tank 14 through the flow channel 10, realizing the rapid recovery of the oil and improving the oil scraping efficiency.

[0036] In addition, the hollow support rod 16 is also convenient for maintenance and cleaning. During long-term use, some impurities or oil scale may accumulate in the flow channel 10, affecting the oil flow efficiency. By adopting a hollow structure, it is convenient to disassemble the connector and clean and maintain the internal flow channel 10, ensuring the continuous and efficient operation of the entire oil scraping system.

[0037] Embodiment Two

[0038] On the basis of Embodiment One, in order to further improve the stability of the fixed ring 7, referring to Figure 3 and Figure 6 , the present utility model further includes that the oil inlet 13 is in a convex shape corresponding to the opening of the flow channel 10. Specifically, through this setting, the support rod 16 can be sleeved on the oil inlet 13, which not only improves the support stability of the support rod 16, but also enables the flow channel 10 and the oil inlet 13 to be in a straight line, further improving the oil return efficiency;

[0039] In this embodiment, a connecting plate 9 is provided on the side of the support rod 16 in contact with the oil inlet 13, and the connecting plate 9 is connected to the reinforcing layer 6. After the support rod 16 is sleeved on the oil inlet 13, the connecting plate 9 can be attached to the reinforcing layer 6, and then the connecting plate 9 can be connected to the reinforcing layer 6 by bolts to fix the support rod 16. Of course, the user can remove the bolts with tools such as a screwdriver to facilitate the disassembly and assembly of the fixed ring 7 by the user.

[0040] Embodiment Three

[0041] On the basis of Embodiment One, in order to further improve the installation efficiency of the fixed ring 7, referring to Figure 3, the present utility model further includes that the fixing ring 7 comprises two opposing half-rings spliced together. Specifically, at the splicing position of the two half-rings, there are corresponding protrusions and grooves. Through this setting, the installation process of the fixing ring 7 is more convenient and rapid. In actual use, the staff only needs to splice the two half-rings along the corresponding positions of the protrusions and grooves to quickly complete the installation of the fixing ring 7. In addition, this design also allows only one of the half-rings to be replaced after the fixing ring 7 is worn, thus reducing the maintenance cost.

[0042] In this embodiment, there are corresponding screw holes on the protrusions and grooves. After splicing, the user can screw the bolts into the screw holes to prevent the fixing ring 7 from collapsing under the impact of the piston rod 5.

[0043] Embodiment Four

[0044] On the basis of Embodiment One, in order to reduce the wear degree of the piston head 8 in the cylinder 3, refer to Figure 2 , the present utility model further includes that a plurality of wear-resistant rings are sleeved on the surface of the piston head 8. Through this setting, the piston head 8 does not directly contact the inner wall of the cylinder 3, thereby reducing the wear of the piston head 8 in the cylinder 3. At the same time, the contact area between the piston head 8 and the inner wall of the cylinder 3 is reduced, the wear degree of the inner wall of the cylinder 3 is reduced, and the service life of the reciprocating compressor is improved.

[0045] In this embodiment, the wear-resistant rings are made of materials with strong wear resistance, such as silicon carbide. This material has characteristics such as high hardness and good wear resistance, and can effectively resist the friction and wear when the piston head 8 reciprocates in the cylinder 3.

[0046] Embodiment Five

[0047] On the basis of any one of Embodiments One to Four, refer to Figure 1 , the present utility model further includes that a packing ring 15 is provided at the connection between the middle body 2 and the cylinder 3. The piston rod 5 movably penetrates through the packing ring 15. An air valve assembly is provided on the cylinder 3, and the air valve assembly includes an intake valve and an exhaust valve;

[0048] In this embodiment, a plurality of ring-shaped or strip-shaped structures made of asbestos fabric or rubber are annularly arranged inside the packing ring 15, and a multi-ring or spiral multi-layer structure is adopted to reduce the gap between the cylinder 3 and the piston rod 5 and prevent gas from leaking from the cylinder 3 into the fuselage.

[0049] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0050] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. An improved reciprocating compressor, comprising a crankcase (1), middle bodies (2) arranged in parallel on both sides of the crankcase (1), and a cylinder (3) connected to the other ends of the middle bodies (2), wherein, Inside the crankcase (1), there is a crankshaft that can rotate in a circular motion, and connecting rods that are arranged in parallel on the crankshaft. Inside the intermediate body (2), there is a crosshead (4) and a piston rod (5). The other end of the connecting rod is connected to the crosshead (4), one end of the piston rod (5) is connected to the crosshead (4), and the other end of the piston rod (5) is provided with a piston head (8) that extends into the cylinder (3). It is characterized in that a reinforcing layer (6) is further provided inside the intermediate body (2), and a plurality of fixing rings (7) that are arranged around the piston rod (5) are provided inside the reinforcing layer (6). Inside the fixing ring (7), there are oil return grooves (11) that are parallel to each other and a scraping ring (12) that fits against the piston rod (5). Inside the reinforcing layer (6), there is an oil return tank (14). An oil inlet (13) is provided on one side of the oil return tank (14) facing the fixing ring (7). A support rod (16) is provided between the oil inlet (13) and the fixing ring (7), and a flow channel (10) that communicates with the oil inlet (13) and the oil return groove (11) is provided inside the support rod (16).

2. The improved reciprocating compressor according to claim 1, characterized in that, The oil inlet (13) is in a convex shape corresponding to the opening of the flow channel (10).

3. The improved reciprocating compressor according to any one of claims 1-2, characterized in that, A connecting plate (9) is provided on the side of the support rod (16) that contacts the oil inlet (13), and the connecting plate (9) is connected to the reinforcing layer (6).

4. The improved reciprocating compressor according to claim 1, characterized in that, At least two fixing rings (7) are provided, and a plurality of fixing rings (7) are distributed symmetrically in parallel inside the reinforcing layer (6).

5. The improved reciprocating compressor according to claim 4, wherein, The fixing ring (7) includes two semi-rings that are spliced oppositely. Among them, corresponding protrusions and grooves are provided at the splicing position of the two semi-rings.

6. The improved reciprocating compressor according to claim 1, characterized in that, A packing ring (15) is provided at the connection between the intermediate body (2) and the cylinder (3), and the piston rod (5) passes through the packing ring (15) movably.

7. The improved reciprocating compressor according to claim 1, wherein, A plurality of wear-resistant rings are sleeved on the surface of the piston head (8).

8. The improved reciprocating compressor according to claim 1, wherein, A valve assembly is provided on the cylinder (3). Among them, the valve assembly includes an intake valve and an exhaust valve.

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