Dual stage by-pass oil filter for diesel engine

Abstract

The application provides a diesel engine lubricating oil two-stage self-bypass filter device, and belongs to the technical field of diesel engine lubricating systems. The device comprises two groups of double-cylinder double-layer filter assemblies which are arranged in parallel; the double-cylinder double-layer filter assemblies are composed of an outer-cylinder lubricating oil fine filter and an inner-cylinder lubricating oil coarse filter which are connected in series; two groups of one-way valve branches are arranged in parallel with the outer-cylinder lubricating oil fine filter, and the one-way valve branches are provided with one-way valves with adjustable opening pressure; an inlet of an inlet three-way switch valve is connected with a diesel engine lubricating oil supply pipeline, and two outlets are connected with inlets of the two groups of double-cylinder double-layer filter assemblies; two inlets and outlets of an outlet three-way switch valve are connected with outlets of the two groups of double-cylinder double-layer filter assemblies, and an outlet is connected with a lubricating part of the diesel engine. When the fine filter is blocked and the pressure difference is increased, the lubricating oil automatically bypasses the fine filter through the one-way valve branch, directly enters the coarse filter, and ensures continuous operation of the diesel engine; the problem that the diesel engine must be stopped for maintenance when the traditional filter is blocked is solved, and the operation reliability and maintenance convenience of the diesel engine are improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of diesel engine lubrication system, specifically relating to a two-stage self-bypass filter for diesel engine lubricating oil. Background Technology

[0002] Diesel engines contain numerous metal friction pairs, such as piston rings and cylinder liners, rollers and camshafts, shafts and bearings, and gears and gears. Good lubrication is a prerequisite for the normal operation of a diesel engine. The lubrication system is a crucial component of a diesel engine, ensuring its normal operation and high efficiency. By providing multiple functions including lubrication, cleaning, cooling, sealing, rust prevention, and hydraulic pressure, the lubrication system strongly guarantees the stability and durability of the diesel engine.

[0003] Traditional diesel engines are designed with an integrated oil filter, which is a dual-cylinder, single-layer filter. (See [reference]) Figure 2 As shown, the lubricating oil enters the lubricating oil coarse filter in two paths through a three-way switching valve. After filtration, it enters various parts of the diesel engine. The three-way switching valve allows for the selection of which filter canisters to be cleaned. Currently, most diesel engine operations are unattended. Some methods rely on filter differential pressure alarms to reflect the working status of the diesel engine lubricating oil filter, while others rely on the magnitude of the diesel engine lubricating oil pressure to infer the working status of the oil filter. After determining the status of the oil filter using either method, a manual decision is made whether to manually clean the diesel engine lubricating oil filter.

[0004] The existing technology has the following drawbacks:

[0005] 1. When the oil filter triggers a differential pressure alarm, the diesel engine must be stopped before the filter can be cleaned. Otherwise, the diesel engine will pose a significant safety hazard and have a certain impact on the normal operation of the ship.

[0006] 2. The oil filter needs to be cleaned frequently with short intervals between cleanings, which increases the workload for diesel engine operators.

[0007] 3. If the differential pressure alarm of the lubricating oil filter is not detected in time, the diesel engine will develop serious quality problems (such as crankshaft seizure, piston cylinder head scoring, broken shaft, etc.) if it continues to run.

[0008] Existing solutions mainly rely on differential pressure alarms or lubricating oil pressure monitoring to determine the filter status, which still requires manual intervention and cannot achieve automatic protection functions. Especially under harsh sea conditions (such as high winds and waves), frequent filter maintenance will bring great difficulties to operators. Utility Model Content

[0009] The technical problem solved by this utility model is to provide a two-stage self-bypass filter for diesel engine lubricating oil. The purpose of this utility model is to design a lubricating oil filtration device that can automatically deal with filter blockage and ensure the continuous and safe operation of the diesel engine.

[0010] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0011] A two-stage bypass filter for diesel engine lubricating oil includes a dual-cylinder, dual-layer filter assembly, a one-way valve branch, an inlet three-way switching valve, and an outlet three-way switching valve.

[0012] The dual-cylinder dual-layer filter assembly is provided in two sets and is arranged in parallel; each set of the dual-cylinder dual-layer filter assembly consists of an outer cylinder lubricating oil fine filter and an inner cylinder lubricating oil coarse filter connected in series;

[0013] The one-way valve branch is provided with two sets and is respectively connected in parallel with the outer cylinder lubricating oil fine filter in the double cylinder double layer filter assembly. The one-way valve branch is provided with an adjustable opening pressure one-way valve.

[0014] The inlet of the three-way switching valve is connected to the diesel engine lubricating oil supply line, and the two outlets are respectively connected to the inlets of two sets of double-cylinder double-layer filter assemblies.

[0015] The two inlets and outlets of the outlet three-way switching valve are respectively connected to the outlets of two sets of double-cylinder double-layer filter assemblies, and their outlets are connected to the lubrication parts of the diesel engine.

[0016] Further defining the above scheme, the inlet of the outer cylinder lubricating oil fine filter is connected to the outlet of the inlet three-way switching valve, the outlet of the outer cylinder lubricating oil fine filter is connected to the inlet of the inner cylinder lubricating oil coarse filter, and the outlet of the inner cylinder lubricating oil coarse filter is connected to the inlet of the outlet three-way switching valve.

[0017] Further defining the above scheme, the inlet end of the one-way valve branch is connected to the pipeline between the inlet three-way switching valve and the outer cylinder lubricating oil fine filter, and the outlet end is connected to the pipeline between the outer cylinder lubricating oil fine filter and the inner cylinder lubricating oil coarse filter.

[0018] As a further limitation of the above scheme, the filtration accuracy of the outer cylinder lubricating oil fine filter is higher than that of the inner cylinder lubricating oil coarse filter.

[0019] As a further limitation of the above scheme, the opening pressure of the one-way valve is set to be equal to or slightly lower than the differential pressure alarm value of the lubricating oil filter.

[0020] As a further limitation of the above scheme, the outer cylinder lubricating oil fine filter and the inner cylinder lubricating oil coarse filter adopt a detachable filter cartridge structure.

[0021] Advantages of this utility model compared to the prior art:

[0022] 1. Automatic protection function of this solution: When the fine filter is clogged, the bypass is automatically activated, which avoids the problem of the diesel engine stopping when the lubricating oil filter has a differential pressure alarm, thus ensuring the normal operation of the ship;

[0023] 2. This solution extends the maintenance cycle: The dual-layer filtration design allows the coarse filter to maintain basic filtration function even after the fine filter becomes clogged; it reduces the frequency of filter cleaning, lengthens the interval between each cleaning, and reduces the workload of diesel engine operators.

[0024] 3. This solution improves safety: it prevents serious mechanical failures caused by the diesel engine continuing to run due to the differential pressure alarm not being detected in time;

[0025] 4. This solution is suitable for harsh environments: it is especially suitable for working conditions where it is inconvenient to maintain immediately, such as when there is no one on duty or when there are strong winds and waves.

[0026] 5. This solution has a simple and reliable structure: it only adds a one-way valve branch and a double-layer filter design to the traditional system, resulting in low modification costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the double-cylinder, double-layer filter system of this utility model;

[0028] Figure 2 This is a schematic diagram of a traditional dual-cylinder single-layer filter system. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0030] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] Please see Figure 1-2 The embodiments of this utility model are described in detail below.

[0032] See Figure 1As shown, the diesel engine lubricating oil dual-stage bypass filter device includes a double-cylinder double-layer filter assembly 1, a one-way valve branch 2, an inlet three-way switching valve 3, and an outlet three-way switching valve 4.

[0033] The dual-cylinder dual-layer filter assembly 1 is provided in two sets and is arranged in parallel; the inlet of the inlet three-way switching valve 3 is connected to the diesel engine lubricating oil supply pipeline, and the two outlets are respectively connected to the inlets of the two sets of dual-cylinder dual-layer filter assemblies 1; the two inlets and outlets of the outlet three-way switching valve 4 are respectively connected to the outlets of the two sets of dual-cylinder dual-layer filter assemblies 1, and its outlet is connected to the diesel engine lubrication part.

[0034] Specifically, each of the dual-cylinder, dual-layer filter assemblies 1 consists of an outer cylinder lubricating oil fine filter 1-1 and an inner cylinder lubricating oil coarse filter 1-2 connected in series; the inlet of the outer cylinder lubricating oil fine filter 1-1 is connected to the outlet of the inlet three-way switching valve 3, the outlet of the outer cylinder lubricating oil fine filter 1-1 is connected to the inlet of the inner cylinder lubricating oil coarse filter 1-2, and the outlet of the inner cylinder lubricating oil coarse filter 1-2 is connected to the inlet of the outlet three-way switching valve 4.

[0035] Specifically, the one-way valve branch 2 has two sets, which are respectively connected in parallel with the outer cylinder lubricating oil fine filter 1-1 in the double-cylinder double-layer filter assembly 1. The one-way valve branch 2 is equipped with a one-way valve 2-1 with adjustable opening pressure. The inlet end of the one-way valve branch 2 is connected to the pipeline between the inlet three-way switching valve 3 and the outer cylinder lubricating oil fine filter 1-1, and the outlet end is connected to the pipeline between the outer cylinder lubricating oil fine filter 1-1 and the inner cylinder lubricating oil coarse filter 1-2.

[0036] Preferably, the filtration accuracy of the outer cylinder lubricating oil fine filter 1-1 is higher than that of the inner cylinder lubricating oil coarse filter 1-2. The outer cylinder lubricating oil fine filter 1-1 and the inner cylinder lubricating oil coarse filter 1-2 adopt a detachable filter cartridge structure.

[0037] Preferably, the opening pressure of the one-way valve 2-1 is set to be equal to or slightly lower than the differential pressure alarm value of the lubricating oil filter.

[0038] This device uses a double-cylinder, double-layer filter and adds a parallel one-way lubricating oil valve lubricating oil circuit (the opening pressure is set to the lubricating oil filter differential pressure alarm value), which can enable the diesel engine to continue to operate normally when the diesel engine filter differential pressure alarm occurs, thus solving the shortcomings of the existing technology.

[0039] Working principle:

[0040] Under normal circumstances, the lubricating oil enters the outer cylinder lubricating oil fine filter 1-1 through the inlet three-way switching valve 3 in two paths (at this time, because the pressure difference across the outer cylinder lubricating oil fine filter 1-1 is less than the opening pressure of the one-way valve 2-1), and then enters various parts of the diesel engine after passing through the inner cylinder lubricating oil coarse filter 1-2. The cleaning selection of each filter canister is achieved through the outlet three-way switching valve 4.

[0041] When the pressure difference before and after the outer cylinder lubricating oil fine filter 1-1 is greater than the opening pressure of the one-way valve 1-2, the lubricating oil will flow through the one-way valve 1-2 and then to the inner cylinder lubricating oil coarse filter 1-2, and then enter various parts of the diesel engine.

[0042] This device has a simple and reasonable structure, which can effectively ensure the lubricating oil pressure of the diesel engine, enabling the diesel engine to continue to operate reliably, extending the cleaning interval of the lubricating oil filter, and continuing to keep the diesel engine running under special circumstances (such as strong winds and waves), thereby improving the operating quality of the diesel engine and the operating efficiency of the ship.

[0043] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A two-stage self-bypass filter for diesel engine lubricating oil, characterized in that: It includes a double-cylinder double-layer filter assembly (1), a one-way valve branch (2), an inlet three-way switching valve (3), and an outlet three-way switching valve (4); The dual-cylinder dual-layer filter assembly (1) is provided in two sets and is arranged in parallel; each set of the dual-cylinder dual-layer filter assembly (1) is composed of an outer cylinder lubricating oil fine filter (1-1) and an inner cylinder lubricating oil coarse filter (1-2) connected in series; The one-way valve branch (2) is provided with two sets and is connected in parallel with the outer cylinder lubricating oil fine filter (1-1) in the double cylinder double layer filter assembly (1). The one-way valve branch (2) is provided with a one-way valve (2-1) with adjustable opening pressure. The inlet of the inlet three-way switching valve (3) is connected to the diesel engine lubricating oil supply pipeline, and the two outlets are respectively connected to the inlet of two sets of double-cylinder double-layer filter assemblies (1); The two inlets and outlets of the outlet three-way switching valve (4) are respectively connected to the outlets of two sets of double-cylinder double-layer filter assemblies (1), and its outlet is connected to the lubrication part of the diesel engine.

2. The diesel engine lubricating oil two-stage bypass filter device according to claim 1, characterized in that: The inlet of the outer cylinder lubricating oil fine filter (1-1) is connected to the outlet of the inlet three-way switching valve (3), the outlet of the outer cylinder lubricating oil fine filter (1-1) is connected to the inlet of the inner cylinder lubricating oil coarse filter (1-2), and the outlet of the inner cylinder lubricating oil coarse filter (1-2) is connected to the inlet of the outlet three-way switching valve (4).

3. The diesel engine lubricating oil two-stage bypass filter device according to claim 2, characterized in that: The inlet end of the one-way valve branch (2) is connected to the pipeline between the inlet three-way switching valve (3) and the outer cylinder lubricating oil fine filter (1-1), and the outlet end is connected to the pipeline between the outer cylinder lubricating oil fine filter (1-1) and the inner cylinder lubricating oil coarse filter (1-2).

4. The diesel engine lubricating oil two-stage bypass filter according to claim 1, characterized in that: The outer cylinder lubricating oil fine filter (1-1) has a higher filtration accuracy than the inner cylinder lubricating oil coarse filter (1-2).

5. The diesel engine lubricating oil two-stage bypass filter according to claim 1, characterized in that: The opening pressure of the one-way valve (2-1) is set to be equal to or slightly lower than the differential pressure alarm value of the lubricating oil filter.

6. The diesel engine lubricating oil two-stage bypass filter according to claim 1, characterized in that: The outer cylinder lubricating oil fine filter (1-1) and the inner cylinder lubricating oil coarse filter (1-2) adopt a detachable filter cartridge structure.

Images