An oil return device for an oil-gas separation barrel

Abstract

The present invention provides an oil return device for an oil-gas separation barrel, which includes an oil-gas separation barrel. An oil-gas separation chamber is arranged inside the oil-gas separation barrel. An oil return pipe is arranged inside the oil-gas separation chamber. A first through hole penetrating the top surface of the oil-gas separation chamber is arranged on the upper end surface of the oil-gas separation barrel. The upper end of the oil return pipe passes through the first through hole to the upper part of the oil-gas separation barrel. The outer peripheral wall of the upper end of the oil return pipe is fixedly connected to the inner peripheral wall of the first through hole through a first connection structure. A sliding rod is arranged inside the oil-gas separation chamber below the oil return pipe. A slot for inserting the lower end of the oil return pipe is arranged on the upper end surface of the sliding rod. A spring is arranged on the bottom surface of the slot. One end of the spring away from the bottom surface of the slot abuts against the lower end surface of the oil return pipe inserted into the slot. The sliding rod is displaced towards the bottom surface of the oil-gas separation chamber under the drive of the spring. A second through hole penetrating the lower end surface of the sliding rod is also arranged on the bottom surface of the slot. A sealing component for sealing the gap between the oil return pipe and the slot is sleeved on the outer peripheral wall of the oil return pipe above the slot.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and more particularly, to an oil return device for an oil-gas separation barrel. Background Art

[0002] In the field of compressors, the installation of the usual oil return pipe is relatively fixed at the bottom position of the oil separation core in the oil-gas separation barrel of the compressor. Generally speaking, a large amount of oil leakage in the compressor is related to the improper installation of the oil return device system. Especially during the installation and maintenance of the machine, the phenomenon of oil leakage from the exhaust pipe is very likely to occur.

[0003] When the compressor is running, a large amount of filtered and precipitated oil accumulates at the bottom of the oil separation core after being filtered by the oil separation core. The traditional oil return device will show an increase in the oil content in the exhaust due to the improper installation of the oil return pipe or an excessive distance between the lower end of the oil return pipe and the bottom of the oil separation core. Seriously, it will cause the oil separation to be oversaturated, resulting in the failure and blockage of the oil separation core, and the problem of the compressor's safety valve detonating. Summary of the Invention

[0004] The present invention provides an oil return device for an oil-gas separation barrel that can always make the lower end of the oil return pipe abut against the bottom of the oil separation core, so that there is no excessive distance between the lower end of the oil return pipe and the bottom of the oil separation core.

[0005] An oil return device for an oil-gas separation barrel of the present invention includes an oil-gas separation barrel. An oil-gas separation chamber is provided inside the oil-gas separation barrel. An oil return pipe is provided inside the oil-gas separation chamber. A first through hole penetrating the top surface of the oil-gas separation chamber is provided on the upper end surface of the oil-gas separation barrel. The upper end of the oil return pipe passes through the first through hole to the upper part of the oil-gas separation barrel. The outer peripheral wall of the upper end of the oil return pipe is fixedly connected to the inner peripheral wall of the first through hole through a first connection structure. At the same time, the first connection structure seals the first through hole. A sliding rod is provided in the oil-gas separation chamber below the oil return pipe. A slot for inserting the lower end of the oil return pipe is provided on the upper end surface of the sliding rod. A spring is provided in the slot. Both ends of the spring abut against the bottom of the slot and the lower end surface of the oil return pipe respectively. The sliding rod is displaced towards the bottom surface of the oil-gas separation chamber under the drive of the spring. A second through hole penetrating the lower end surface of the sliding rod is further provided on the bottom surface of the slot. A sealing component for sealing the gap between the oil return pipe and the slot is sleeved on the outer peripheral wall of the oil return pipe above the slot.

[0006] Compared with the existing oil return device in the oil-gas separation barrel, the lower end of the oil return pipe in the oil return device of this technical solution will always abut against the bottom surface of the oil-gas separation chamber, thereby ensuring that the precipitated oil at the bottom of the oil-gas separation chamber can be removed from the oil-gas separation chamber, thus preventing the phenomenon of a large amount of filtered and precipitated oil accumulating at the bottom of the oil-gas separation chamber, and effectively improving the service life of the oil-gas separation system.

[0007] In this technical solution, the outer peripheral wall of the upper end of the oil return pipe is fixedly connected to the first through hole through the first connection structure, thereby preventing the upper end of the oil return pipe from having a longitudinal displacement during its normal operation. A sliding rod is installed at the lower end of the oil return pipe. A slot is provided on the upper end surface of the sliding rod. The lower end of the oil return pipe is inserted into the slot. A spring is provided on the bottom surface of the slot. One end of the spring away from the bottom surface of the slot abuts against the lower end surface of the oil return pipe inserted into the slot. Therefore, when the upper end of the oil return pipe is fixed and the lower end of the oil return pipe is inserted into the slot, the sliding rod will be displaced in the direction away from the lower end of the oil return pipe under the pushing of the spring. At this time, the lower end surface of the sliding rod will abut against the bottom surface of the oil-gas separation chamber, so that the sediment oil at the bottom of the oil-gas separation chamber can be fully pumped out of the oil-gas separation chamber by the oil return pipe, thereby preventing a large amount of sediment oil from accumulating at the bottom of the oil-gas separation chamber.

[0008] As a preference: The first connection structure includes a connection block. The outer peripheral wall of the lower end of the connection block is threadedly connected to the inner peripheral wall of the first through hole through a thread structure. A convex block is provided at the center of the upper end surface of the connection block. A first groove is provided at the center of the upper end surface of the convex block. A third through hole is provided at the center of the bottom surface of the first groove, which penetrates the lower end surface of the connection block and allows the upper end of the oil return pipe to pass through. A fixing ring is sleeved on the outer peripheral wall of the oil return pipe above the connection block. The lower end of the fixing ring can be embedded in the first groove. The vertical height of the fixing ring is greater than the longitudinal depth of the first groove. A first sliding sleeve that can slide along the length direction of the oil return pipe is sleeved on the outer peripheral wall of the oil return pipe above the fixing ring. A second groove is provided at the center of the lower end surface of the first sliding sleeve. A thread structure that can be threadedly connected to the inner peripheral wall of the second groove is circumferentially provided on the outer peripheral wall of the convex block. When the inner peripheral wall of the second groove is threadedly connected to the outer peripheral wall of the convex block, the fixing ring is deformed by the mutual extrusion of the upper end surface of the convex block and the bottom surface of the second groove. The lower end of the deformed fixing ring is embedded and seals the first groove. At the same time, the central hole of the fixing ring is circumferentially clamped to the outer peripheral wall of the oil return pipe due to the deformation. In this technical solution, a thread groove is circumferentially provided on the inner peripheral wall of the first through hole, and a thread protrusion that can be threadedly connected to the thread groove on the inner peripheral wall of the first through hole is circumferentially provided on the outer peripheral wall of the lower end of the connection block; the convex block and the upper end of the connection block are integrally formed. A thread protrusion is provided on the outer peripheral wall of the convex block, and a thread groove that can be threadedly connected to the thread protrusion on the outer peripheral wall of the convex block is provided on the inner peripheral wall of the second groove. The second groove and the convex block are fixedly connected under the cooperation of the threads. The fixing ring is located between the convex block and the first sliding sleeve. When the first sliding sleeve slides along the return pipe towards the convex block and the first sliding sleeve is threadedly connected to the convex block, the fixing ring is displaced towards the first groove under the pushing of the bottom surface of the second groove on the lower end surface of the first sliding sleeve. The lower end of the fixing ring slides into the first groove and deforms under the mutual extrusion between the second groove and the first groove. The deformed fixing ring fills and seals the first groove. At the same time, the inner diameter of the central hole of the deformed fixing ring also becomes smaller. Therefore, the inner peripheral wall of the central hole of the deformed fixing ring circumferentially bites and clamps the outer peripheral wall of the oil return pipe, thereby preventing the oil return pipe from longitudinally displacing in the third through hole, and thus completing the process of fixing the oil return pipe in the first through hole.

[0009] As a preference: on the inner peripheral wall at the upper end of the first groove, a guiding inclined surface for facilitating the embedding of the lower end of the fixing ring is circumferentially arranged. The outer diameter of the outer peripheral wall of the fixing ring is smaller than the inner diameter of the inner peripheral wall at the upper end of the first groove, but larger than the inner diameter of the inner peripheral wall at the lower end of the first groove. In this technical solution, the design of the guiding inclined surface can facilitate the fixing ring to slide into the first groove from the upper end surface of the continuous hitting block. Since the first groove is an inverted conical structure with a larger upper port diameter and a smaller lower port diameter, the outer diameter of the fixing ring is smaller than the inner diameter of the upper end of the first groove and larger than the inner diameter of the lower end of the first groove. Therefore, when the fixing ring slides into the first groove, the outer peripheral wall of the lower end of the fixing ring will gradually deform under the extrusion of the inner peripheral wall of the first groove, so that the shape of the outer peripheral wall of the lower end of the fixing ring is the same as the shape of the inner peripheral wall at the lower end of the first groove. At this time, the fixing ring will continuously deform under the continuous pressure of the first sliding sleeve until the fixing ring completely fills the gap between the first groove and the outer peripheral wall of the oil return pipe, thereby achieving the effect of the fixing ring sealing the first groove. While the fixing ring fills the first groove, due to the deformation of the fixing ring, the inner diameter of the central hole of the fixing ring will also shrink accordingly. The inner peripheral wall of the shrunk central hole of the fixing ring will circumferentially clamp the outer peripheral wall of the oil return pipe inserted into the central hole of the fixing ring, thereby achieving the effect of fixing the oil return pipe through the fixing ring.

[0010] As a preference: at the center of the upper end surface of the sliding rod, a third groove is arranged. On the bottom surface of the third groove, a fourth groove is arranged. The slot is arranged at the center of the bottom surface of the fourth groove. The third groove, the fourth groove and the slot are all coaxially arranged.

[0011] As a preference: the sealing assembly includes a sealing ring embedded in the fourth groove and a second sliding sleeve sleeved on the outer peripheral wall of the oil return pipe above the sliding rod. The sealing ring is sleeved on the outer peripheral wall of the oil return pipe. The outer peripheral wall of the lower end of the second sliding sleeve is threadedly connected to the inner peripheral wall of the third groove through a threaded structure. When the second sliding sleeve is threadedly connected to the third groove, the sealing ring is deformed by the extrusion between the lower end surface of the second sliding sleeve and the bottom surface of the fourth groove, thereby sealing the gap between the oil return pipe and the inner peripheral wall of the slot.

[0012] As a preference: the sealing ring is a fluororubber O-ring.

[0013] As a preference: on the lower end surface of the oil return pipe, an inclined cutting surface for facilitating the sediment oil at the bottom of the oil-gas separation cavity to flow into the oil return pipe is arranged. The lower end of the second through hole communicates with the center of the inclined cutting surface. Description of the Drawings

[0014] Figure 1 is a cross-sectional view of the present invention;

[0015] Figure 2 is Figure 1 the enlarged view at A in

[0016] Figure 3 is Figure 1 the enlarged view at B in

[0017] Description of reference numerals:

[0018] Oil-gas separation barrel; 2-oil-gas separation chamber; 3-oil return pipe; 4-first through hole; 5-sliding rod; 6-slot; 7-spring; 8-second through hole; 9-connecting block; 10-bump; 11-first groove; 12-third through hole; 13-fixing ring; 14-first sliding sleeve; 15-second groove; 16-guide slope; 17-third groove; 18-fourth groove; 19-sealing ring; 20-second sliding sleeve; 21-inclined section. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0020] Example 1: See Figures 1 to 3 In this embodiment, the oil return device of the oil-gas separation barrel includes an oil-gas separation barrel 1 and an oil return pipe 3. An oil-gas separation chamber 2 is arranged inside the oil-gas separation barrel 1, and the oil return pipe 3 is arranged inside the oil-gas separation chamber 2. A first through hole 4 is arranged on the upper end surface of the oil-gas separation barrel 1 to communicate with the top surface of the oil-gas separation chamber 2. The upper end of the oil return pipe 3 passes through the first through hole 4 and then extends to the top of the oil-gas separation barrel 1. A connecting block 9 is sleeved on the outer peripheral wall of the upper end of the oil return pipe 3, that is, a through hole for the oil return pipe 3 to pass through is longitudinally arranged in the center of the upper end surface of the connecting block 9. A threaded protrusion is circumferentially arranged on the outer peripheral wall of the lower end of the connecting block 9, and a threaded groove that can match the threaded protrusion on the outer peripheral wall of the connecting block 9 is circumferentially arranged on the inner peripheral wall of the first through hole 4. Therefore, when the threaded protrusion on the outer peripheral wall of the connecting block 9 is threadedly connected with the threaded groove on the inner peripheral wall of the first through hole 4, the connecting block 9 is fixedly connected with the first through hole 4.

[0021] A convex block 10 is provided at the center of the upper end face of the connecting block 9. The convex block 10 is integrally formed with the connecting block 9. A first groove 11 is provided at the center of the upper end face of the convex block 10. A third through hole 12 penetrating the lower end face of the connecting block 9 is provided at the center of the bottom surface of the first groove 11. The return oil pipe 3 can pass through the third through hole 12 on the lower end face of the connecting block 9 to the upper side of the convex block 10. A guiding inclined surface 16 is circumferentially provided on the inner peripheral wall of the upper end of the first groove 11, that is, the inner diameter of the inner peripheral wall of the upper end of the first groove 11 is larger than the inner diameter of the inner peripheral wall of the lower end of the first groove 11, so that the first groove 11 presents an inverted conical structure. A fixing ring 13 is sleeved on the outer peripheral wall of the return oil pipe 3 above the first groove 11, that is, a through hole penetrating the center of its lower end face is provided at the center of the upper end face of the fixing ring 13. The return oil pipe 3 can pass through the through hole on the lower end face of the fixing ring 13 to the upper side of the upper end face of the fixing ring 13. The fixing ring 13 is made of a rigid material. The outer diameter of the outer peripheral wall of the lower end of the fixing ring 13 is smaller than the inner diameter of the inner peripheral wall of the upper end of the first groove 11, but larger than the outer diameter of the inner peripheral wall of the lower end of the first groove 11. Therefore, the fixing ring 13 can slide into the first groove 11 under the drive of an external force. A first sliding sleeve 14 is also sleeved on the outer peripheral wall of the return oil pipe 3 above the fixing ring 13. A second groove 15 is provided at the center of the lower end face of the first sliding sleeve 14. A through hole penetrating the center of the bottom surface of the second groove 15 is provided at the center of the upper end face of the first sliding sleeve 14. The return oil pipe 3 located above the fixing ring 13 can pass through the through hole on the bottom surface of the second groove 15 to the upper side of the upper end face of the first sliding sleeve 14. Threaded grooves are circumferentially provided on the inner peripheral wall of the second groove 15, and threaded protrusions that can be adapted to the threaded grooves on the inner peripheral wall of the second groove 15 are circumferentially provided on the outer peripheral wall of the convex block 10. Therefore, when the first sliding sleeve 14 slides along the return pipe towards the convex block 10 and the first sliding sleeve 14 is threadedly connected to the convex block 10, the fixing ring 13 is displaced towards the first groove 11 under the push of the bottom surface of the second groove 15. The lower end of the fixing ring 13 slides into the first groove 11 and deforms under the mutual extrusion between the second groove 15 and the first groove 11. The deformed fixing ring 13 will fill and seal the first groove 11. At the same time, the inner diameter of the central hole of the deformed fixing ring 13 will also become smaller. Therefore, the inner peripheral wall of the central hole of the deformed fixing ring 13 will circumferentially bite and clamp the outer peripheral wall of the return oil pipe 3, thereby preventing the return oil pipe 3 from realizing longitudinal displacement in the third through hole 12, and thus completing the process of fixing the return oil pipe 3 in the first through hole 4.

[0022] The lower end of the return oil pipe 3 extends into the lower end of the oil-gas separation chamber 2. A sliding rod 5 is also arranged below the return oil pipe 3 in the oil-gas separation chamber 2, and the sliding rod 5 is vertically arranged in the oil-gas separation chamber 2. A third groove 17 is arranged at the center of the upper end surface of the sliding rod 5, a fourth groove 18 is arranged on the bottom surface of the third groove 17, and a slot 6 is arranged at the center of the bottom surface of the fourth groove 18. The lower end of the return oil pipe 3 can be inserted into the slot 6 to realize a plug-in structure between the return oil pipe 3 and the sliding rod 5. A spring 7 is arranged on the bottom surface of the slot 6, the upper end of the spring 7 abuts against the lower end surface of the return oil pipe 3, and the lower end of the spring 7 abuts against the bottom surface of the slot 6. Since the upper end of the return oil pipe 3 is clamped and fixed in the first through hole 4 by the combination of the connecting block 9 and the fixing ring 13, the return oil pipe 3 will not have a longitudinal displacement phenomenon in the oil-gas separation chamber 2. At this time, the sliding rod 5 will be displaced towards the bottom of the oil-gas separation chamber 2 under the drive of the spring 7 until the lower end surface of the sliding rod 5 abuts against the bottom surface of the oil-gas separation chamber 2. A second through hole 8 penetrating the lower end surface of the sliding rod 5 is also arranged on the bottom surface of the slot 6. The sediment oil at the bottom of the oil-gas separation chamber 2 can flow into the slot 6 from the second through hole 8 and then be pumped out of the oil-gas separation chamber 2 by the return oil pipe 3 inserted in the slot 6, thus completing the process of cleaning the sediment oil at the bottom of the oil-gas separation chamber 2.

[0023] A sealing assembly is also arranged above the sliding rod 5. The sealing assembly includes a sealing ring 19 and a second sliding sleeve 20. The sealing ring 19 is embedded in the fourth groove 18 and simultaneously sleeved on the outer peripheral wall of the return oil pipe 3. The second sliding sleeve 20 is sleeved on the outer peripheral wall of the return oil pipe 3 above the sealing ring 19, that is, a through hole penetrating its upper end surface is arranged on the lower end surface of the second sliding sleeve 20, and the return oil pipe 3 can pass through the through hole on the lower end surface of the second sliding sleeve 20 to the upper side of the upper end surface of the second sliding sleeve 20. Threaded protrusions are circumferentially arranged on the outer peripheral wall of the lower end surface of the second sliding sleeve 20, and threaded grooves adapted to the threaded protrusions on the outer peripheral wall of the second sliding sleeve 20 are circumferentially arranged on the inner peripheral wall of the third groove 17. When the second sliding sleeve 20 slides along the length direction of the return oil pipe 3 towards the third groove 17, the threaded protrusions on the outer peripheral wall of the lower end of the second sliding sleeve 20 will be embedded in the threaded grooves on the inner peripheral wall of the third groove 17, and the second sliding sleeve 20 and the sliding rod 5 are fixedly connected under the cooperation of the threaded structure. When the lower end surface of the second sliding sleeve 20 abuts against the bottom surface of the third groove 17, the sealing ring 19 is transversely deformed in the fourth groove 18 under the extrusion of the lower end surface of the second sliding sleeve 20. At this time, the inner diameter of the central hole of the sealing ring 19 is reduced, so as to seal the gap between the inner peripheral wall of the plug and the outer peripheral wall of the return oil pipe 3, and the sediment oil in the slot 6 can be normally pumped out of the oil-gas separation chamber 2 through the return oil pipe 3.

[0024] In this embodiment, the sealing ring 19 is a fluororubber O-ring.

[0025] The lower end face of the oil return pipe 3 is provided with an inclined cut surface 21 that facilitates the sediment oil at the bottom of the oil-gas separation chamber to flow into the oil return pipe 3, and the lower end of the second through hole 8 communicates with the center of the inclined cut surface 21.

[0026] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. An oil return device for an oil and gas separation barrel, comprising an oil and gas separation barrel, an oil and gas separation cavity is arranged inside the oil and gas separation barrel, and an oil return pipe is arranged inside the oil and gas separation cavity, characterized in that: A first through hole penetrating the top surface of the oil-gas separation chamber is provided on the upper end surface of the oil-gas separation barrel. The upper end of the return oil pipe passes through the first through hole to the upper part of the oil-gas separation barrel. The outer peripheral wall of the return oil pipe is fixedly connected to the inner peripheral wall of the first through hole through a first connection structure. At the same time, the first connection structure seals the first through hole. A sliding rod is arranged below the return oil pipe in the oil-gas separation chamber. A slot for inserting the lower end of the return oil pipe is provided on the upper end surface of the sliding rod. A spring is arranged in the slot, and the two ends of the spring respectively abut against the bottom of the slot and the lower end surface of the return oil pipe. A second through hole penetrating the lower end surface of the sliding rod is also provided on the bottom surface of the slot. A sealing component for sealing the gap between the return oil pipe and the slot is sleeved on the outer peripheral wall of the return oil pipe above the slot; the first connection structure includes a connection block. The outer peripheral wall of the lower end of the connection block is threadedly connected to the inner peripheral wall of the first through hole through a thread structure. A convex block is arranged at the center of the upper end surface of the connection block. A fixing ring is sleeved on the outer peripheral wall of the return oil pipe above the connection block. A first sliding sleeve that can slide along the length direction of the return oil pipe is sleeved on the outer peripheral wall of the return oil pipe above the fixing ring. When the inner peripheral wall of the second groove is threadedly connected to the outer peripheral wall of the convex block, the fixing ring is deformed by the mutual extrusion of the upper end surface of the convex block and the bottom surface of the second groove. The lower end of the deformed fixing ring is embedded and seals the first groove. At the same time, the central hole of the fixing ring is circumferentially bitten and clamped on the outer peripheral wall of the return oil pipe due to the deformation; an inclined plane is provided on the lower end surface of the return oil pipe to facilitate the sediment oil at the bottom of the oil-gas separation chamber to flow into the return oil pipe. The lower end of the second through hole communicates with the center of the inclined plane.

2. The oil return device of an oil-gas separation barrel according to claim 1, characterized in that: A first groove is arranged at the center of the upper end surface of the convex block. A third through hole penetrating the lower end surface of the connection block and allowing the upper end of the return oil pipe to pass through is arranged at the center of the bottom surface of the first groove. The lower end of the fixing ring can be embedded in the first groove. The vertical height of the fixing ring is greater than the longitudinal depth of the first groove. A second groove is arranged at the center of the lower end surface of the first sliding sleeve. A thread structure that can be threadedly connected to the inner peripheral wall of the second groove is circumferentially arranged on the outer peripheral wall of the convex block.

3. The oil return device of an oil-gas separation barrel according to claim 2, characterized in that: A guiding inclined plane for facilitating the embedding of the lower end of the fixing ring is circumferentially arranged on the inner peripheral wall of the upper end of the first groove. The outer diameter of the outer peripheral wall of the fixing ring is smaller than the inner diameter of the inner peripheral wall of the upper end of the first groove, but larger than the inner diameter of the inner peripheral wall of the lower end of the first groove.

4. The oil return device of an oil-gas separation barrel according to claim 1, characterized in that: A third groove is arranged at the center of the upper end surface of the sliding rod. A fourth groove is arranged on the bottom surface of the third groove. The slot is arranged at the center of the bottom surface of the fourth groove. The third groove, the fourth groove, and the slot are all coaxially arranged.

5. The oil return device of an oil and gas separation barrel according to claim 4, characterized in that: The sealing component includes a sealing ring embedded in the fourth groove and a second sliding sleeve sleeved on the outer peripheral wall of the return oil pipe above the sliding rod. The sealing ring is sleeved on the outer peripheral wall of the return oil pipe. The second sliding sleeve can longitudinally slide along the length direction of the return oil pipe. The outer peripheral wall of the lower end of the second sliding sleeve is threadedly connected to the inner peripheral wall of the third groove through a thread structure. After the second sliding sleeve is threadedly connected to the third groove, the sealing ring is deformed by the extrusion between the lower end surface of the second sliding sleeve and the bottom surface of the fourth groove, so as to seal the gap between the return oil pipe and the inner peripheral wall of the slot.

6. The oil return device of an oil-gas separation barrel according to claim 5, characterized in that: The sealing ring is a fluororubber O-ring.

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