Throttling structure for controlling oil level height of lubricating oil cavity of oil injection pump

Abstract

The utility model discloses a throttling structure for controlling the oil level height of a lubricating oil cavity of an oil injection pump, which relates to the field of throttling structures and is connected with a pump body of the oil injection pump, and the pump body of the oil injection pump is provided with a pump cavity and comprises a lubricating oil inlet screw seat which is connected with the pump body of the oil injection pump. The side, away from the oil injection pump body, of the lubricating oil inlet screw seat is connected with a lubricating oil inlet screw, the lubricating oil inlet screw is sleeved with a lubricating oil inlet pipe, the lubricating oil inlet screw is coaxially provided with a through hole, the through hole is perpendicularly provided with a first throttling hole, the first throttling hole communicates with the lubricating oil inlet pipe, and the lubricating oil inlet screw seat is provided with an oil inlet cavity. A second throttling hole is formed in the side, close to the pump cavity, of the oil inlet cavity and communicates with the pump cavity. According to the method for controlling the oil level of the lubricating oil cavity of the fuel injection pump, the lubricating effect of the pump cavity is guaranteed, the oil level in the pump cavity is effectively controlled, and therefore the risk caused by the fact that the oil level in the pump cavity is high and not easy to control is avoided.

Description

Technical Field

[0001] The utility model relates to the field of throttling structures, in particular to a throttling structure for controlling the oil level height of a lubricating oil chamber of an oil injection pump. Background Art

[0002] During the operation of a diesel engine, the performance stability and life of the fuel injection pump are greatly affected by the lubrication conditions. There are two types of lubrication methods for diesel engine inline fuel injection pumps: splash lubrication and forced lubrication.

[0003] Existing fuel injection pumps usually use forced lubrication, that is, diesel engine lubricating oil is introduced into the pump chamber through a specific oil path to lubricate the pump internal components. However, during the use of this forced lubrication method, it was found that the amount of lubricating oil at the throttle hole connected to the pump chamber is high, which makes the oil flow rate entering the pump chamber larger, so that the oil level of the lubricating oil in the pump chamber is high and difficult to control, which in turn leads to risks such as high oil pump temperature, increased movement resistance of governor parts, insensitive speed regulation response, and oil leakage.

[0004] In order to reduce the oil level in the pump chamber, the traditional method is to reduce the flow of lubricating oil entering the pump chamber by reducing the diameter of the throttle hole. However, this method has obvious defects: due to the reduction of the throttle hole diameter, it is easy to be blocked by debris, resulting in an increased risk of dry grinding of the oil pump. Therefore, how to effectively control the oil level in the pump chamber while ensuring the lubrication effect has become an urgent problem to be solved. Utility Model Content

[0005] The utility model aims to provide a throttling structure for controlling the oil level height of the lubricating oil chamber of an injection pump, which can effectively control the oil level height in the pump chamber while ensuring the lubrication effect of the pump chamber, thereby avoiding the risks caused by the high oil level height in the pump chamber and the difficulty in controlling it.

[0006] The above-mentioned optimized structure of the utility model is realized through the following technical scheme: a throttling structure for controlling the oil level height of the lubricating oil chamber of the fuel injection pump is connected to the fuel injection pump body, the fuel injection pump body is provided with a pump chamber, including a lubricating oil inlet screw seat, the lubricating oil inlet screw seat is connected to the fuel injection pump body, the lubricating oil inlet screw seat is connected to a lubricating oil inlet screw on the side away from the fuel injection pump body, a lubricating oil inlet pipe is sleeved on the lubricating oil inlet screw, a through hole is coaxially provided on the lubricating oil inlet screw, a first throttling hole is vertically provided on the through hole, the first throttling hole is communicated with the lubricating oil inlet pipe, the lubricating oil inlet screw seat is provided with an oil inlet chamber, the oil inlet chamber is provided with a second throttling hole on the side close to the pump chamber, and the second throttling hole is communicated with the pump chamber.

[0007] In some embodiments, the lubricating oil inlet pipe includes an oil inlet hole, the oil inlet hole is connected to an oil delivery hole, the oil delivery hole is sleeved on the lubricating oil inlet screw and connected to the first throttle hole.

[0008] In some embodiments, a threaded hole is provided on one side of the lubricating oil inlet screw seat close to the lubricating oil inlet screw, the threaded hole is connected to the oil inlet cavity, and the lubricating oil inlet screw is threadedly matched with the threaded hole.

[0009] In some embodiments, a connecting hole is provided on one side of the fuel injection pump body close to the lubricating oil inlet screw seat, the connecting hole is threadedly engaged with the lubricating oil inlet screw seat, one side of the connecting hole is connected to the pump chamber, and the other side is connected to the second throttling hole.

[0010] In some embodiments, the through hole, the oil inlet chamber and the second throttle hole are coaxially arranged.

[0011] In some embodiments, two sealing rings are sleeved on the lubricating oil inlet screw, and the lubricating oil inlet pipe is arranged between the two sealing rings.

[0012] In some embodiments, the first throttle hole is located on a side of the oil delivery hole close to the lubricating oil inlet screw seat.

[0013] In some embodiments, tapered holes are provided on both sides of the second throttling hole.

[0014] In some embodiments, the first throttle hole and the second throttle hole have the same size.

[0015] In summary, the utility model has the following beneficial effects:

[0016] This throttling structure for controlling the oil level in the lubricating oil chamber of the fuel injection pump forms a two-level throttling structure by arranging a first throttling hole with the same diameter as the second throttling hole on the lubricating oil inlet screw, thereby reducing the lubricating oil flow at the second throttling hole. It can effectively control the oil level in the pump chamber while ensuring the lubrication effect of the pump chamber, thereby avoiding the risks brought about by the high and difficult to control oil level in the pump chamber. At the same time, the structure is simple, and the throttling function can be achieved by only drilling a small-diameter transverse hole at an appropriate position on the lubricating oil inlet screw, thereby reducing the manufacturing cost and being easily replaced according to the requirements of the diesel engine. It has good versatility and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the utility model connected to the fuel injection pump body;

[0018] Figure 2 It is a partial cross-sectional view of the utility model connected to the fuel injection pump body.

[0019] In the figure: 1. fuel injection pump body; 11. pump chamber; 12. connecting hole; 2. lubricating oil inlet screw seat; 21. oil inlet chamber; 22. second throttle hole; 3. lubricating oil inlet screw; 31. through hole; 32. first throttle hole; 4. lubricating oil inlet pipe; 41. oil inlet hole; 42. oil delivery hole; 5. sealing ring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] refer to Figure 1-2 A throttling structure for controlling the oil level of the lubricating oil chamber of a fuel injection pump comprises a lubricating oil inlet screw seat 2, a lubricating oil inlet screw 3, and a lubricating oil inlet pipe 4. A fuel injection pump body 1 is provided with a pump chamber 11 for accommodating the working parts and lubricating oil of the fuel injection pump. A connecting hole 12 is provided on one side of the fuel injection pump body 1 close to the lubricating oil inlet screw seat 2. A screw hole is provided on the inner wall of the connecting hole 12, so that the connecting hole 12 can be screwed with the lubricating oil inlet screw seat 2 to form a tight connection structure. One side of the connecting hole 12 is connected to the pump chamber 11, and the other side is connected to the lubricating oil inlet screw seat 2, so as to ensure that the lubricating oil can smoothly enter the pump chamber.

[0022] The lubricating oil inlet screw seat 2 is provided with an oil inlet chamber 21, and the oil inlet chamber 21 is provided with a second throttling hole 22 on the side close to the pump chamber 11, and the second throttling hole 22 is connected with the connecting hole 12, thereby realizing the connection with the pump chamber 11; the lubricating oil inlet screw seat 2 is provided with a threaded hole on the side close to the lubricating oil inlet screw 3, and the threaded hole is connected to the oil inlet chamber 21, and the lubricating oil inlet screw 3 is threadedly matched with the threaded hole.

[0023] The lubricating oil inlet screw 3 is coaxially provided with a through hole 31, and a first throttle hole 32 is vertically provided on the through hole 31. A lubricating oil inlet pipe 4 is sleeved on the lubricating oil inlet screw 3, and the first throttle hole 32 is connected to the lubricating oil inlet pipe 4 for introducing lubricating oil into the lubrication system.

[0024] In some embodiments, the lubricating oil inlet pipe 4 includes an oil inlet hole 41 and an oil delivery hole 42. The oil inlet hole 41 is coaxially connected with the oil delivery hole 42. The oil delivery hole 42 is sleeved on the lubricating oil inlet screw 3 and connected to the first throttling hole 32. When the lubricating oil enters the oil delivery hole 42 through the oil inlet hole 41, the throttling effect of the first throttling hole 32 is used to achieve preliminary control of the lubricating oil inlet amount.

[0025] In some embodiments, the through hole 31, the oil inlet chamber 21 and the second throttle hole 22 are coaxially arranged to help maintain the stability of the flow of the lubricating oil.

[0026] In some embodiments, two sealing rings 5 ​​are provided on the lubricating oil inlet screw 3. The sealing ring 5 can be a rubber sealing ring or a polyurethane sealing ring. A lubricating oil inlet pipe 4 is provided between the two sealing rings 5 ​​to enhance the sealing performance and prevent lubricating oil leakage.

[0027] In some embodiments, the first throttle hole 32 is located on the side of the oil delivery hole 42 close to the lubricating oil inlet screw seat 2, which can reduce the speed of the lubricating oil in the lubricating oil inlet pipe 4 entering the lubricating oil inlet screw 3, and further reduce the lubricating oil flow at the second throttle hole 22.

[0028] In some embodiments, tapered holes are provided on both sides of the second throttling hole 22 to facilitate the smooth flow of lubricating oil and reduce throttling resistance.

[0029] In some embodiments, the first throttle hole 32 and the second throttle hole 22 have the same size, so that equal amounts of lubricating oil can enter and exit, achieving dynamic balance and controlling the oil level in the pump chamber 11 .

[0030] In some embodiments, the diameter of the through hole 31 is smaller than the diameter of the oil inlet chamber 21 , which can reduce the flow velocity of the lubricating oil from the through hole 31 to the oil inlet chamber 21 , and further reduce the lubricating oil flow at the second throttle hole 22 .

[0031] The specific working principle is as follows:

[0032] During operation, the lubricating oil enters the oil delivery hole 42 through the oil inlet hole 41, and after the throttling effect of the first throttling hole 32, enters the through hole 31 of the lubricating oil inlet screw 3. Due to the throttling effect of the first throttling hole 32, preliminary control of the amount of lubricating oil entering can be achieved. Then, the lubricating oil enters the oil inlet chamber 21 through the threaded hole, and then passes through the throttling effect of the second throttling hole 22, and finally enters the pump chamber 11. The design of the second throttling hole can reduce the lubricating oil flow at the second throttling hole 22, thereby reducing the lubricating oil flow entering the pump chamber 11, effectively controlling the oil level in the pump chamber 11, thereby avoiding the risks caused by the high oil level in the pump chamber 11 and being difficult to control.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A throttling structure for controlling the oil level of a lubricating oil chamber of an injection pump, connected to a pump body (1) of the injection pump, wherein the pump body (1) of the injection pump is provided with a pump chamber (11), characterized in that: The invention comprises a lubricating oil inlet screw seat (2), wherein the lubricating oil inlet screw seat (2) is connected to the fuel injection pump body (1), a lubricating oil inlet screw (3) is connected to the side of the lubricating oil inlet screw seat (2) away from the fuel injection pump body (1), a lubricating oil inlet pipe (4) is sleeved on the lubricating oil inlet screw (3), a through hole (31) is coaxially provided on the lubricating oil inlet screw (3), a first throttle hole (32) is vertically provided on the through hole (31), the first throttle hole (32) is communicated with the lubricating oil inlet pipe (4), the lubricating oil inlet screw seat (2) is provided with an oil inlet cavity (21), a second throttle hole (22) is provided on the side of the oil inlet cavity (21) close to the pump cavity (11), and the second throttle hole (22) is communicated with the pump cavity (11).

2. A throttling structure for controlling the oil level of the lubricating oil chamber of a fuel injection pump according to claim 1, characterized in that: The lubricating oil inlet pipe (4) comprises an oil inlet hole (41), the oil inlet hole (41) is connected to an oil delivery hole (42), the oil delivery hole (42) is sleeved on the lubricating oil inlet screw (3) and connected to the first throttle hole (32).

3. A throttling structure for controlling the oil level of the lubricating oil chamber of a fuel injection pump according to claim 1, characterized in that: A threaded hole is provided on one side of the lubricating oil inlet screw seat (2) close to the lubricating oil inlet screw (3); the threaded hole is connected to the oil inlet cavity (21); and the lubricating oil inlet screw (3) is threadedly engaged with the threaded hole.

4. A throttling structure for controlling the oil level of the lubricating oil chamber of an oil injection pump according to claim 1, characterized in that: A connecting hole (12) is provided on one side of the fuel injection pump body (1) close to the lubricating oil inlet screw seat (2), the connecting hole (12) being threadedly engaged with the lubricating oil inlet screw seat (2), one side of the connecting hole (12) being in communication with the pump chamber (11), and the other side of the connecting hole (12) being in communication with the second throttle hole (22).

5. A throttling structure for controlling the oil level of the lubricating oil chamber of a fuel injection pump according to claim 1, characterized in that: The through hole (31), the oil inlet chamber (21) and the second throttle hole (22) are coaxially arranged.

6. A throttling structure for controlling the oil level of the lubricating oil chamber of a fuel injection pump according to claim 1, characterized in that: Two sealing rings (5) are sleeved on the lubricating oil inlet screw (3), and the lubricating oil inlet pipe (4) is arranged between the two sealing rings (5).

7. A throttling structure for controlling the oil level of the lubricating oil chamber of a fuel injection pump according to claim 2, characterized in that: The first throttle hole (32) is located on a side of the oil delivery hole (42) close to the lubricating oil inlet screw seat (2).

8. The throttling structure for controlling the oil level of the lubricating oil chamber of the fuel injection pump according to claim 1, characterized in that: Conical holes are provided on both sides of the second throttling hole (22).

9. A throttling structure for controlling the oil level of the lubricating oil chamber of a fuel injection pump according to claim 1, characterized in that: The first throttle hole (32) and the second throttle hole (22) have the same size.

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