A pulsation damper for a diesel engine

Abstract

The present invention relates to a diesel engine oil pressure testing device, and to a pulsation buffer for a diesel engine. The pulsation buffer for a diesel engine has a shell with a hexagonal cross section; a threaded shaft is provided on one end face of the shell; the center of the threaded shaft has an oil delivery hole with a claw-shaped concave spherical surface at the lower end face, and a steel ball is arranged in the oil delivery hole; a baffle is provided on the upper end face of the oil delivery hole; a channel connected to the oil delivery hole is provided at the bottom of the oil delivery hole; the lower end of the channel extends into the shell; an internal threaded hole is provided on the other side of the shell corresponding to the threaded shaft; the bottom surface of the internal threaded hole has an offset hole connected to the internal threaded hole and eccentrically arranged; a stepped hole connecting the offset hole and the channel is provided in one side wall of the shell; a needle valve is matched with the stepped hole; there is a gap between the needle valve and the stepped hole, and the gap constitutes an oil chamber. The present invention effectively attenuates the pressure fluctuation in the lubricating oil pressure test pipeline, and avoids the damage of the lubricating oil pressure test equipment due to pressure fluctuation.

Description

Technical Field

[0001] The invention relates to a diesel engine oil pressure testing device, in particular to a pulsation buffer for a diesel engine. Background Art

[0002] In the process of fluid transportation, since the delivery pressure of power devices such as pumps has a pulsating law, the pressure of the fluid will fluctuate according to factors such as changes in pipe diameter and bending in the pipeline layout. This phenomenon will affect the accuracy of the pressure testing equipment on the fluid transportation pipeline. In severe cases, it will damage the testing equipment.

[0003] As a complex power machine, the operation of each system of the diesel engine is cyclical. During operation, there are high safety inspection requirements. It is necessary to detect the pressure in the lubricating oil supply system and other systems. When the pressure exceeds a certain range, emergency stop is required. The fluctuation of lubricating oil pressure will interfere with the measurement of lubricating oil pressure, and when the fluctuation is too severe, it will damage the measuring equipment. Therefore, it is very necessary to control the pressure fluctuation in the pressure test pipeline of the diesel engine lubricating oil supply system. Summary of the invention

[0004] The present invention provides a pulsation buffer for a diesel engine, which can effectively attenuate the pressure fluctuation in the lubricating oil pressure test pipeline and avoid the damage of the lubricating oil pressure test equipment due to the pressure fluctuation.

[0005] The present invention adopts the following technical solutions to achieve the above-mentioned purpose:

[0006] A pulsation buffer for a diesel engine, the pulsation buffer has a shell with a hexagonal cross-section; a convex threaded shaft is provided on one end face of the shell; the threaded shaft is coaxially arranged with the shell; the center of the threaded shaft has an oil delivery hole with a claw-shaped concave spherical surface at the lower end face, and a steel ball is arranged in the oil delivery hole; a baffle is provided on the upper end face of the oil delivery hole to prevent the steel ball from falling; a channel connected to the oil delivery hole is provided at the bottom of the oil delivery hole; the size of the channel is smaller than the size of the oil delivery hole; the lower end of the channel extends into the shell; an internal threaded hole is provided on the other side of the shell corresponding to the threaded shaft; the internal threaded hole The groove hole is coaxially arranged with the threaded shaft; the bottom surface of the internal threaded hole has an offset hole which is connected with the internal threaded hole and is eccentrically arranged; the axis of the offset hole is parallel to the axis of the channel; a stepped hole is arranged in one side wall of the shell; the stepped hole connects the offset hole and the channel; a needle valve in the shape of a stepped shaft is matched with the stepped hole; a gap for oil flow is provided between the needle valve and the stepped hole, and the gap constitutes an oil chamber; the needle valve and the stepped hole cooperate to form a pulsation buffer which buffers the external oil pressure when the pressure in the oil chamber maintains a balanced force with the input oil pressure to which the steel ball is subjected.

[0007] The stepped hole comprises a first-level threaded stepped hole, a second-level stepped hole, a third-level stepped hole, and a fourth-level stepped hole which are sequentially connected from the outside of the housing to the inside; wherein the fourth-level stepped hole is connected to the offset hole of the threaded hole, and the third-level stepped hole is connected to the channel at the bottom of the oil delivery hole;

[0008] The apertures of the first-level external threaded stepped hole, the second-level stepped hole, the third-level stepped hole, and the fourth-level stepped hole decrease in sequence.

[0009] The needle valve is in the shape of a stepped shaft, which is sequentially a first-level threaded stepped shaft, a second-level stepped shaft, a third-level stepped shaft, and a fourth-level stepped shaft. The first-level threaded stepped shaft is provided with a hexagonal hole; a gasket and an O-ring are sleeved on the third-level stepped shaft.

[0010] The present invention proposes a pulsation buffer for a diesel engine, which is a lubricating oil pressure fluctuation buffer with a simple structure, convenient manufacturing and easy maintenance. It effectively attenuates the pressure fluctuation in the lubricating oil pressure test pipeline and avoids damage to the lubricating oil pressure test equipment due to pressure fluctuation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall installation component structure of the present invention.

[0012] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0013] Figure 3 It is a schematic diagram of the shell structure of the present invention.

[0014] Figure 4 It is a schematic diagram of the needle valve structure of the present invention.

[0015] In the figure: 1-housing, 2-steel ball, 3-needle valve, 4-gasket, 5-O-ring, 10-oil delivery hole, 11-shaft thread, 12-baffle, 13-claw-shaped concave spherical surface, 14-bright hole, 15-threaded hole, 16-offset hole, 17-first-level threaded stepped hole, 18-second-level stepped hole, 19-third-level stepped hole, 110-fourth-level stepped hole, 31-hexagonal hole, 32-first-level threaded stepped shaft, 33-second-level stepped shaft, 34-third-level stepped shaft, 35-fourth-level stepped shaft. DETAILED DESCRIPTION

[0016] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] As shown in the accompanying drawings, a pulsation buffer for a diesel engine includes a housing 1, a steel ball 2, a needle valve 3, a gasket 4, an O-ring 5, etc. The housing 1 is a stepped outer hexagonal shape, one end of which is a shaft thread 11, and a baffle 12 is provided on the end face of the shaft thread 11. The baffle 12 is set after the steel ball 2 is placed in the oil delivery hole 10. The root of the oil delivery hole 10 is a claw-shaped concave spherical surface 13, and a light hole 14 is opened at the root of the oil delivery hole 10. The other end is a threaded hole 15, and the root of the threaded hole 15 has a non-center offset hole 16. A first-level stepped threaded hole 17 is provided on one side of the outer hexagon of the housing 1, and a second-level stepped threaded hole 17 is provided on the inner side of the outer hexagon of the housing 1. The stepped hole 18, the three-stepped hole 19, and the four-stepped hole 110 are connected with the offset hole 16 of the threaded hole 15, and the three-stepped hole 19 is connected with the light hole 14 at the root of the oil delivery hole 10; the needle valve 3 is a stepped shaft shape, which is a first-step shaft thread 32, a second-step shaft 33, a third-step shaft 34, and a fourth-step shaft 35 in sequence, and the first-step shaft thread 32 is provided with a hexagonal hole 31, and the gasket 4 and the O-ring 5 are sequentially installed on the third-step shaft 34; the assembled needle valve 3 is installed in the housing 1 to form a pulsation buffer.

[0018] Use the assembled pulsation buffer, use the threaded hole 15 and the shaft thread 11 to connect in series with the corresponding pipe connection. During the oil transmission process, the fuel flows from the oil delivery hole 10 through the steel ball 2 into the light hole 14, and flows through the offset hole 16 through the gap between the stepped shaft and the stepped hole of the needle valve 3. By adjusting the needle valve 3, an oil chamber can be formed between the stepped shaft and the stepped hole of the needle valve 3. When the pressure in the oil chamber maintains a balanced force with the input oil pressure of the steel ball 2, it plays a buffering role for the external oil pressure.

[0019] The lubricating oil pressure fluctuation buffer of the present invention has a simple structure, is easy to manufacture and maintain, and can effectively attenuate pressure fluctuations in a lubricating oil pressure test pipeline, thereby avoiding damage to lubricating oil pressure test equipment due to pressure fluctuations.

Claims

1. A pulsation damper for a diesel engine, characterized in that: The pulsation buffer has a shell with a hexagonal cross section; a protruding threaded shaft is provided on one end face of the shell; the threaded shaft is coaxially arranged with the shell; the center of the threaded shaft has an oil delivery hole with a claw-shaped concave spherical surface at the lower end face, and a steel ball is arranged in the oil delivery hole; a baffle is provided on the upper end face of the oil delivery hole to prevent the steel ball from falling; a channel connected to the oil delivery hole is provided at the bottom of the oil delivery hole; the size of the channel is smaller than the size of the oil delivery hole; the lower end of the channel extends into the shell; a shell corresponding to the threaded shaft An internal threaded hole is provided on the other side; the internal threaded hole is coaxially arranged with the threaded shaft; the bottom surface of the internal threaded hole has an offset hole connected with the internal threaded hole and eccentrically arranged; the axis of the offset hole is parallel to the axis of the channel; a stepped hole is provided in one side wall of the shell; the stepped hole has a primary threaded stepped hole, a secondary stepped hole, a tertiary stepped hole, and a quaternary stepped hole which are sequentially connected from the outside of the shell to the inside; wherein the quaternary stepped hole is connected with the offset hole of the threaded hole, and the tertiary stepped hole is connected with the channel at the bottom of the oil delivery hole; The stepped hole connects the offset hole and the channel; a needle valve in the shape of a stepped shaft is matched with the stepped hole; a gap for the flow of engine oil is provided between the needle valve and the stepped hole, and the gap constitutes an oil chamber; the needle valve and the stepped hole cooperate to constitute a pulsation buffer which buffers the external oil pressure when the pressure in the oil chamber maintains a balanced force with the input oil pressure on the steel ball; the needle valve is in the shape of a stepped shaft, which is a first-level threaded stepped shaft, a second-level stepped shaft, a third-level stepped shaft, and a fourth-level stepped shaft in sequence, and the first-level threaded stepped shaft is provided with a hexagonal inner hole; a gasket and an O-ring are sleeved on the third-level stepped shaft.

2. A pulsation damper for a diesel engine as claimed in claim 1, characterized in that: The apertures of the first-level threaded step hole, the second-level step hole, the third-level step hole and the fourth-level step hole are arranged in order from large to small.

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