Oil return joint of oil injector

Abstract

The utility model relates to the technical field of oil sprayers, and discloses an oil sprayer oil return connector which comprises an inner pipe and an outer pipe, a plurality of backflow holes communicated with an oil return channel are formed in the inner wall of the inner pipe, and a plug plate used for plugging the backflow holes is arranged in a cavity of the inner pipe. The limiting assembly is arranged in a cavity of the inner pipe and used for supporting and limiting the plug plate, the limiting assembly comprises a baffle and a check ring, the baffle is connected with the inner pipe in an inserted mode, the check ring is in threaded connection with the inner pipe and abuts against the baffle, a spring is arranged on one side of the plug plate and can abut against the end of the baffle, the check ring can be loosened and loosened through a hexagon wrench by loosening the check ring, and after the check ring is detached, the baffle is pulled out. And due to the fact that the plug plate slides repeatedly, the edge position of the plug plate can be abraded, the plug plate is limited through the baffle and the check ring, the plug plate can be detached and replaced conveniently after being abraded, whole replacement is not needed, later maintenance is facilitated, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel injectors, in particular to an oil return joint of a fuel injector. Background Art

[0002] After the fuel pump supplies fuel to the engine and forms a certain pressure, in addition to the normal fuel supply to the fuel nozzle for injection, the remaining fuel is sent back to the fuel tank through the return oil pipeline to realize oil recovery.

[0003] The prior art discloses a diesel engine injector oil return joint (publication number: CN220395874U), comprising an oil return joint, a side wall of the oil return joint being sleeved with an oil return pipe, a blocking plate being slidably installed between the oil return pipe and the oil return joint, a slide being slidably installed inside the oil return joint, a plurality of oil outlet holes being opened on the side wall of the oil return joint, and the interior of the oil return joint being connected to the oil return pipe through the oil outlet holes.

[0004] The existing technology uses oil pressure to push the baffle to slide through the oil to cause the oil to leak out, and uses the oil outlet to discharge the return oil. However, as time goes by, the baffle slides repeatedly, and its edge position is easily worn, and then a gap is formed between the baffle and the pipeline. At this time, the sealing performance is greatly reduced, which will affect the internal pressure and sealing performance of the pipeline. However, due to the installation method of the baffle, when replacing and maintaining it, there is a certain inconvenience in removing the baffle located inside the pipeline, which makes later maintenance difficult, and the overall replacement causes an increase in maintenance costs.

[0005] For this purpose, we propose an injector oil return joint. Utility Model Content

[0006] The utility model mainly solves the technical problem that the plate for blocking the oil drain hole is difficult to replace and maintain after being worn, and provides an injector oil return joint.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solution, an injector oil return connector, comprising:

[0008] An inner tube and an outer tube, wherein the outer tube is sleeved on the outside of the inner tube and fixedly connected to the inner tube, an oil return channel is formed between the inner tube and the outer tube, a plurality of reflux holes connected to the oil return channel are opened on the inner wall of the inner tube, and a plug plate for blocking the reflux holes is provided in the inner tube cavity;

[0009] A limiting assembly is arranged in the inner tube cavity for supporting and limiting the plug plate. The limiting assembly includes a baffle and a retaining ring. The baffle is plugged into the inner tube, and the retaining ring is threadedly connected to the inner tube and contacts the baffle. A spring is provided on one side of the plug plate, and the spring can contact the end of the baffle.

[0010] As a preferred embodiment of the present invention, the inner diameter of the outer tube is larger than the outer diameter of the inner tube, and an oil return channel is formed between the inner wall of the outer tube and the outer wall of the inner tube. The plug plate is slidably connected to the inner wall of the inner tube, and an annular plate is fixedly installed on the outer wall of the inner tube. The outer ring of the annular plate is fixedly connected to the inner wall of the outer tube, and the annular plate is close to one end of the inner tube.

[0011] As a preferred embodiment of the present invention, a plurality of reflux holes are opened on the circumference of the inner tube, the reflux holes are close to one end of the inner tube, the reflux holes are circular, and the thickness of the plug plate is greater than the diameter of the reflux holes.

[0012] As a preferred embodiment of the present invention, the baffle is formed into a circular plate, which is adapted to the inner tube. The retaining ring is annular, the outer ring of the retaining ring is provided with threads, the inner wall of the inner tube is provided with teeth, and the retaining ring is threadedly connected to the inner wall of the inner tube.

[0013] As a preferred embodiment of the present invention, the limiting assembly further includes an ear and a slot, the ear is fixedly connected to the baffle, a slot is provided at the end of the inner tube, and the ear is plugged into the slot.

[0014] As a preferred embodiment of the present invention, the ear portion and the baffle are integrally formed, and the ear portion forms a rectangular block structure.

[0015] As a preferred embodiment of the present invention, the slot forms a rectangular notch adapted to fit the ear, and the depth of the slot is less than the length of the inner tube.

[0016] The utility model provides an injector oil return connector, which has the following beneficial effects:

[0017] 1. This injector oil return joint can be loosened by loosening the retaining ring. In order to facilitate the tightening of the retaining ring, the inner ring of the retaining ring can be set to be hexagonal. The retaining ring can be tightened or loosened by a hexagonal wrench. After the retaining ring is removed, the baffle can be pulled out, and then the plug plate can be removed to replace the plug plate. Since the plug plate slides repeatedly, the edge of the plug plate will be worn. The baffle and the retaining ring limit the plug plate, which is convenient for removal and replacement after the plug plate is worn. There is no need to replace the entire plug plate, which is convenient for later maintenance and reduces maintenance costs.

[0018] 2. This is an injector oil return joint, the slot extends to a position close to the return hole, by placing the ear into the slot and pushing it, when the ear is pushed to the bottom of the slot, the baffle is located on one side of the return hole, and the plug plate is located on the other side of the return hole. At this time, a gap is left between the baffle and the plug plate for the sliding of the plug plate, and the position of the baffle can be fixed by tightening the retaining ring. The baffle can be a circular plate, and a sealing ring can be installed on the circumference of the baffle to ensure the sealing, which has a good limiting effect on the baffle. When installing and removing the baffle, the baffle is not easy to deviate, and the annular retaining ring can ensure the support effect of the baffle. After the baffle is installed and reset, it can ensure the support of the spring and ensure that the baffle and the plug plate form a spaced seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is one of the overall three-dimensional diagrams of the utility model;

[0020] Figure 2 This is the second overall stereogram of the utility model;

[0021] Figure 3 This is one of the cutaway views of the inner and outer tubes of the present invention;

[0022] Figure 4 This is the second cross-sectional view of the inner tube and outer tube of the utility model;

[0023] Figure 5 This is a three-dimensional diagram of the baffle of the present utility model.

[0024] Legend: 10, inner tube; 11, outer tube; 12, plug plate; 13, return hole; 20, baffle; 21, retaining ring; 22, ear; 23, slot. DETAILED DESCRIPTION

[0025] A fuel injector return oil connector, such as Figure 1 and Figure 2 Shown, including:

[0026] The inner tube 10 and the outer tube 11 are sleeved on the outside of the inner tube 10 and fixedly connected to the inner tube 10. An oil return channel is formed between the inner tube 10 and the outer tube 11. The inner wall of the inner tube 10 is provided with a plurality of return holes 13 connected to the oil return channel. A plug plate 12 for blocking the return holes 13 is provided in the cavity of the inner tube 10. The inner diameter of the outer tube 11 is larger than the outer diameter of the inner tube 10. An oil return channel is formed between the inner wall of the outer tube 11 and the outer wall of the inner tube 10. The plug plate 12 is slidably connected to the inner wall of the inner tube 10. The outer wall of the inner tube 10 is fixedly installed with an annular plate. The outer ring of the plate is fixedly connected to the inner wall of the outer tube 11. The annular plate is close to one end of the inner tube 10. Specifically, the plug plate 12 is a circular plate made of rubber. The plug plate 12 and the inner tube 10 have an interference fit. When the injector sends oil into the cavity of the inner tube 10, the pressure of the oil pushes the plug plate 12 to slide and compress the spring. The plug plate 12 moves from one side of the return hole 13 to the other side, and then the return oil in the inner tube 10 enters the return oil channel from the return hole 13 and is discharged, realizing oil return. The return hole 13 can be automatically sealed according to the cylinder pressure, realizing automatic oil return and sealing.

[0027] like Figure 2 、 Figure 3 and Figure 4As shown, the limiting assembly is arranged in the cavity of the inner tube 10 for supporting and limiting the plug plate 12. The limiting assembly includes a baffle 20 and a retaining ring 21. The baffle 20 is plugged into the inner tube 10. The retaining ring 21 is threadedly connected to the inner tube 10 and contacts the baffle 20. A spring is provided on one side of the plug plate 12, and the spring can contact the end of the baffle 20. A plurality of reflux holes 13 are opened on the circumference of the inner tube 10. The reflux holes 13 are close to one end of the inner tube 10. The reflux holes 13 are circular. The thickness of the plug plate 12 is greater than the diameter of the reflux holes 13. The baffle 20 forms a circular plate. The baffle 20 is adapted to the inner tube 10. The retaining ring 21 is annular. The outer ring of the retaining ring 21 It is provided with a thread, and a tooth mouth is opened on the inner wall of the inner tube 10. The retaining ring 21 is threadedly connected to the inner wall of the inner tube 10. By loosening the retaining ring 21, in order to facilitate the tightening of the retaining ring 21, the inner ring of the retaining ring 21 can be set to be hexagonal, and the retaining ring 21 can be loosened and tightened with a hexagonal wrench. After removing the retaining ring 21, the baffle 20 can be pulled out, and then the plug plate 12 can be removed to achieve replacement of the plug plate 12. Since the plug plate 12 slides repeatedly, the edge position of the plug plate 12 will be worn. The baffle 20 and the retaining ring 21 limit the plug plate 12, which is convenient for removal and replacement after the plug plate 12 is worn. There is no need to replace the entire thing, which is convenient for later maintenance and reduces maintenance costs.

[0028] like Figure 3 and Figure 5 As shown, the limiting assembly also includes an ear 22 and a slot 23. The ear 22 is fixedly connected to the baffle 20. The slot 23 is opened at the end of the inner tube 10. The ear 22 is plugged into the slot 23. The ear 22 and the baffle 20 are integrally formed. The ear 22 forms a rectangular block structure. The slot 23 forms a rectangular notch adapted to the ear 22. The depth of the slot 23 is less than the length of the inner tube 10. As a supplement to the above scheme, specifically, the slot 23 extends to a position close to the reflux hole 13. By placing the ear 22 into the slot 23 and pushing it, when the ear 22 is pushed to the bottom of the slot 23, the baffle 20 is located at the reflux hole 1 3, the plug plate 12 is located on one side of the reflux hole 13, and the plug plate 12 is located on the other side of the reflux hole 13. At this time, a gap is left between the baffle 20 and the plug plate 12 for the sliding of the baffle 12. The position of the baffle 20 can be fixed by tightening the retaining ring 21. The baffle 20 can be a circular plate. A sealing ring can be installed on the circumference of the baffle 20 to ensure sealing, which has a good limiting effect on the baffle 20. When installing and removing the baffle 20, the baffle 20 is not easy to deviate. The annular retaining ring 21 can ensure the support effect of the baffle 20. After the baffle 20 is installed and reset, it can ensure the support of the spring and ensure that the baffle 20 and the plug plate 12 form a spaced seal.

[0029] The working principle of the present invention: In order to facilitate the tightening of the retaining ring 21, the inner ring of the retaining ring 21 can be set to be hexagonal, and the retaining ring 21 can be loosened or tightened by a hexagonal wrench. After removing the retaining ring 21, the baffle 20 can be pulled out, and then the plug plate 12 can be removed to achieve replacement of the plug plate 12. The slot 23 extends to a position close to the reflux hole 13. By placing the ear 22 into the slot 23 and pushing, when the ear 22 is pushed to the bottom of the slot 23, the baffle 20 is located on one side of the reflux hole 13, and the plug plate 12 is located on the other side of the reflux hole 13. At this time, a gap is left between the baffle 20 and the plug plate 12 for the sliding of the plug plate 12. The position of the baffle 20 can be fixed by tightening the retaining ring 21. The baffle 20 can be a circular plate, and a sealing ring can be installed on the circumference of the baffle 20 to ensure sealing.

[0030] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A fuel injector oil return joint, characterized in that: include: An inner tube (10) and an outer tube (11), wherein the outer tube (11) is sleeved on the outside of the inner tube (10) and fixedly connected to the inner tube (10), an oil return channel is formed between the inner tube (10) and the outer tube (11), a plurality of return holes (13) communicating with the oil return channel are opened on the inner wall of the inner tube (10), and a plug plate (12) for blocking the return holes (13) is provided in the cavity of the inner tube (10); A limiting assembly is arranged in the cavity of the inner tube (10) for supporting and limiting the plug plate (12), the limiting assembly comprising a baffle (20) and a retaining ring (21), the baffle (20) being plugged into the inner tube (10), the retaining ring (21) being threadedly connected to the inner tube (10) and abutting against the baffle (20), and a spring is provided on one side of the plug plate (12), and the spring is capable of abutting against the end of the baffle (20).

2. The fuel injector oil return connector according to claim 1, characterized in that: The inner diameter of the outer tube (11) is larger than the outer diameter of the inner tube (10); an oil return channel is formed between the inner wall of the outer tube (11) and the outer wall of the inner tube (10); the plug plate (12) is slidably connected to the inner wall of the inner tube (10); an annular plate is fixedly installed on the outer wall of the inner tube (10); the outer ring of the annular plate is fixedly connected to the inner wall of the outer tube (11); and the annular plate is close to one end of the inner tube (10).

3. The fuel injector oil return connector according to claim 1, characterized in that: The inner tube (10) is provided with a plurality of reflux holes (13) on its circumference. The reflux holes (13) are close to one end of the inner tube (10). The reflux holes (13) are circular. The thickness of the plug plate (12) is greater than the diameter of the reflux holes (13).

4. The fuel injector oil return connector according to claim 1, characterized in that: The baffle (20) is formed into a circular plate, which is adapted to the inner tube (10). The baffle (20) is annular, the outer ring of the baffle (21) is provided with a thread, the inner wall of the inner tube (10) is provided with a toothed opening, and the baffle (21) is threadedly connected to the inner wall of the inner tube (10).

5. The fuel injector oil return connector according to claim 1, characterized in that: The limiting assembly further comprises an ear (22) and a slot (23); the ear (22) is fixedly connected to the baffle (20); the slot (23) is provided at the end of the inner tube (10); and the ear (22) is plugged into the slot (23).

6. The fuel return connector for the fuel injector according to claim 5, characterized in that: The ear portion (22) and the baffle (20) are integrally formed, and the ear portion (22) forms a rectangular block structure.

7. The fuel return connector for the fuel injector according to claim 5, characterized in that: The slot (23) forms a rectangular notch adapted to the ear portion (22), and the depth of the slot (23) is less than the length of the inner tube (10).

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