Oil inlet screw with one-way valve for gear oil delivery pump
By integrating oil inlet screws with a check valve on the gear oil transfer pump, the problem of high-pressure oil pump being unable to absorb oil at low speeds is solved, efficient start-up of the diesel engine fuel system and large flow transmission are achieved, and sealing performance and oil absorption performance are ensured. balance.
Patent Information
- Application Number
- CN202323582219.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-27
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2033-12-27
AI Technical Summary
The existing high-pressure oil pumps cannot effectively absorb oil at low speeds, resulting in poor start-up performance of the diesel engine fuel system and the large flow demand of the high-pressure common rail pump has not been met.
A oil inlet screw with a check valve for gear oil transfer pump is designed, including oil inlet screws, steel balls, springs and ball seats. Through the combined structure of the ball valve, the high flow demand of the high-pressure common rail pump is achieved and at low speeds. Provides appropriate opening pressure to ensure sealing and oil absorption.
This design improves the start performance of the oil transfer pump at low speeds, meets the large flow demand of the high-pressure common rail pump, and avoids the problem of too small opening pressure affecting the sealing performance or excessively affecting the oil absorption performance, achieving efficient fuel delivery.
Smart Images
Figure CN222184985U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of diesel engine fuel system, in particular to an oil inlet screw with a one-way valve for a gear oil pump. Background Art
[0002] Faced with increasingly severe energy and environmental pressures, high-pressure fuel pumps, as an important part of the high-pressure common rail system, have become standard equipment for diesel engines. The fuel pump on the high-pressure fuel pump draws low-pressure fuel from the fuel tank into the fuel pump plunger cavity through the filter, and the high pressure is established through the reciprocating motion of the plunger. The high-pressure fuel is stored in the common rail, and at the same time, the injector injects the high-pressure fuel in the common rail into the engine combustion with the best injection timing, injection amount and injection method according to the signal sent by the ECU. The gear fuel pump is a common structural type of fuel pump component integrated on the high-pressure fuel pump.
[0003] It was found through tests that a certain high-pressure oil pump, when the pipeline and the oil pump are full of diesel, rail pressure is established in 3 seconds at 100rpm, and oil is discharged from the rail in 17 seconds; however, when the pipeline, filter and oil pump are emptied, oil cannot be sucked at 100rpm, and fuel can be sucked to a certain height in 1 minute and 51 seconds at 150rpm; therefore, the utility model provides an oil inlet screw with a one-way valve for a gear oil pump to solve the above problem. Utility Model Content
[0004] In view of the deficiencies in the prior art, the utility model provides an oil inlet screw with a one-way valve for a gear oil pump, which solves the problems mentioned in the above background technology.
[0005] To achieve the above purpose, the utility model is implemented through the following technical scheme: an oil inlet screw with a one-way valve for a gear oil pump, including an oil inlet screw, a steel ball, a spring, and a ball seat. A steel ball sealing cone surface is axially arranged at the tail end of the oil inlet screw, and a step hole is installed in the ball seat. The steel ball, spring, and ball seat are sequentially installed in the axial hole at the tail end of the oil inlet screw.
[0006] Preferably, the ball seat is threadedly connected to the oil inlet screw.
[0007] Preferably, the ball seat is provided with a spring mounting hole, and fuel channels are provided in the circumferential direction and the axial direction.
[0008] Preferably, the axial fuel passage is configured as a hexagonal plum blossom shape.
[0009] Preferably, the opening pressure of the steel ball is less than or equal to 0.4 bar.
[0010] Beneficial Effects
[0011] The utility model provides an oil inlet screw with a one-way valve for a gear oil pump. Compared with the prior art, it has the following beneficial effects: the oil inlet screw with a one-way valve for the gear oil pump integrates the one-way valve on the oil inlet screw of the oil pump, and the overall structure is compact and easy to disassemble and assemble. The one-way valve is a ball valve, which meets the large flow demand of the gear oil pump for the high-pressure common rail pump and provides a suitable opening pressure to avoid the low opening pressure affecting the sealing performance, and the high opening pressure affecting the oil suction performance. The oil inlet screw with a one-way valve of the utility model is installed at the oil inlet of the oil pump to meet the starting performance of the low-speed oil pump. At the same time, it meets the large flow and suitable opening pressure requirements of the oil pump. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of the oil inlet screw with a one-way valve of the gear oil pump of the utility model;
[0013] Figure 2 It is a structural schematic diagram of the oil inlet screw of the utility model;
[0014] Figure 3 It is a schematic diagram of a ball seat of the utility model;
[0015] Figure 4 This is a schematic diagram of the application of an ordinary oil inlet screw and an oil inlet screw with a one-way valve.
[0016] In the figure: 1- oil inlet screw, 2- steel ball, 3- spring, 4- ball seat. DETAILED DESCRIPTION
[0017] 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 the embodiments. Based on the embodiments in 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.
[0018] See also Figure 1-4 The utility model provides a technical solution: an oil inlet screw with a one-way valve for a gear oil pump, comprising an oil inlet screw 1, a steel ball 2, a spring 3, and a ball seat 4. The tail end of the oil inlet screw 1 is axially provided with a steel ball sealing cone surface, and the ball seat is installed with a step hole. The steel ball 2, the spring 3, and the ball seat 4 are sequentially installed in the axial hole at the tail end of the oil inlet screw 1.
[0019] As a further technical solution, the ball seat 4 is threadedly connected to the oil inlet screw 1, the ball seat 4 is provided with a spring mounting hole, and fuel channels are provided in the circumferential and axial directions; the axial fuel channel is provided in a hexagonal plum blossom shape.
[0020] As a further technical solution, the opening pressure of the steel ball 2 is less than or equal to 0.4 bar.
[0021] In this technical solution, the one-way valve is composed of a steel ball 2, a spring 3, and a ball seat 4. When the high-pressure oil pump works normally, the steel ball 2 opens, and the fuel is sucked into the oil pump inlet chamber from the oil inlet screw 1 through the fuel channel on the ball seat 4; when the high-pressure oil pipe is closed, the steel ball 2 closes the seal, and the fuel in the oil pump, filter and pipeline will not flow back to the fuel tank, so it can be started quickly next time. The ball seat 4 is threadedly connected to the oil inlet screw 1, and a spring mounting hole is set on the ball seat 4. Circumferential and axial fuel channels are set, which have large flow characteristics. At the same time, the axial fuel oil channel is set to an inner hexagon plum blossom shape and has the function of installing and tightening torque. The opening pressure of the steel ball is about 0.4 bar. If the opening pressure is too small, it will affect the sealing performance when closed, and if it is too large, it will affect the low-speed oil suction capacity. At the same time, it meets the large flow and appropriate opening pressure requirements of the oil pump.
[0022] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.
[0023] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An oil inlet screw with a one-way valve for a gear oil pump, comprising an oil inlet screw (1), a steel ball (2), a spring (3), and a ball seat (4), characterized in that: A steel ball sealing cone is axially arranged at the tail end of the oil inlet screw (1), and a ball seat is installed with a stepped hole. The steel ball (2), spring (3) and ball seat (4) are sequentially installed in the axial hole at the tail end of the oil inlet screw (1).
2. The oil inlet screw with a one-way valve for a gear oil pump according to claim 1, characterized in that: The ball seat (4) is threadedly connected to the oil inlet screw (1).
3. The oil inlet screw with a one-way valve for a gear oil pump according to claim 1, characterized in that: The ball seat (4) is provided with a spring mounting hole, and fuel channels are provided in the circumferential direction and the axial direction.
4. The oil inlet screw with a one-way valve for a gear oil pump according to claim 3, characterized in that: The axial fuel passage is arranged in a hexagonal plum blossom shape.
5. The oil inlet screw with a one-way valve for a gear oil pump according to claim 1, characterized in that: The opening pressure of the steel ball (2) is less than or equal to 0.4 bar.