Corrosion inhibitor slow release method for methanol fuel engine
By setting a cavity and a one-way valve in the lubrication system to control the oil pressure, the corrosion inhibitor is slowly released, which solves the problem of inappropriate corrosion inhibitor filling in the existing technology, extends the maintenance mileage of the engine, and adapts to the application in high temperature and high corrosion environments.
Patent Information
- Application Number
- CN202511194991.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-26
- Publication Date
- 2025-09-26
AI Technical Summary
The existing technology lacks a suitable method for adding corrosion inhibitors, and cannot meet the end-customer demand for extended maintenance mileage of methanol-fueled engines. Especially in high-temperature and high-corrosion scenarios, traditional adding methods cannot effectively extend the action time of corrosion inhibitors.
A method for slow-release of corrosion inhibitor was designed. By setting a cavity in the lubrication system and using a one-way valve and a compression spring to control the oil pressure, the corrosion inhibitor was slowly released when the engine was running. Combined with the electronic pump and filter of the lubrication system, quantitative and continuous addition of corrosion inhibitor was achieved.
It extends the action time of the corrosion inhibitor in the engine, improves the engine's maintenance mileage, and adapts to the long-term protection needs in high-temperature and high-corrosion environments.
Smart Images
Figure CN120701436A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of filling engine oil additives in an engine, and in particular to a corrosion inhibitor slow-release method for a methanol fuel engine. Background Art
[0002] At present, the mainstream fuels for domestic engines are mainly divided into two categories: traditional fossil fuels and alternative fuels. With the promotion of the "dual carbon" policy and technological innovation, the fuel structure is showing a diversified development trend. In the future, the focus will shift from traditional fuels to green alternative fuels. Among them, the application of alcohol fuels has ushered in development opportunities due to its dual advantages of environmental protection and economy. With the development of methanol engine technology, the corrosion problem of the lubrication system caused by the combustion of methanol fuel is generally solved by using additives to reduce the strong corrosiveness of methanol fuel (such as formic acid, formaldehyde and other acidic products) to corrode metal parts. Corrosion inhibitors for methanol-fueled engines are key additives for combating the highly corrosive nature of methanol fuel (e.g., acidic products like formic acid and formaldehyde) that attack metal components. These inhibitors utilize organic heterocyclic compounds (imidazoline and benzotriazole) as their core corrosion inhibitors. They utilize a quaternary ammonium salt adsorption film and alkaline neutralizers to synergistically resist acidic corrosion, supplemented by polymer dispersants to maintain system stability. Future developments will require breakthroughs in high-temperature / multiphase protection, as well as the development of ash-free formulations to reduce costs, to adapt to the large-scale application of methanol fuel in high-temperature, highly corrosive environments such as heavy trucks and ships.
[0003] The traditional method of adding additives is to mix them directly with the lubricant (engine oil) and replace them together with the lubricant during maintenance. However, with the development of new fuel hybrid engine technology, end customers have extended their maintenance mileage requirements, and there is currently no suitable adding method that can meet customer needs. Summary of the Invention
[0004] In response to the needs of the prior art, the present invention provides a method for slow-releasing a corrosion inhibitor for a methanol fuel engine, the purpose of which is to achieve slow release of the corrosion inhibitor, thereby extending the action time of the corrosion inhibitor in the engine and further extending the maintenance mileage.
[0005] A method for slow-releasing a corrosion inhibitor for a methanol fuel engine includes a lubrication system of the methanol fuel engine and the following steps: Step 1: A cavity filled with corrosion inhibitor is provided in the lubrication system, wherein a liquid inlet and a liquid outlet are provided at the top and bottom of the cavity respectively, and a one-way valve is provided in the liquid inlet to allow oil to flow into the cavity in one direction through the liquid inlet; Step 2: Position the cavity within the oil flow path of the lubrication system; Step 3: By increasing the oil pressure entering the one-way valve, the oil opens the one-way valve and enters the cavity through the liquid inlet. The density of the corrosion inhibitor is lower than that of the oil. Under the restriction of the internal space of the cavity, the oil entering the upper part of the cavity squeezes the corrosion inhibitor out of the cavity through the liquid outlet. Step 4: The squeezed corrosion inhibitor is mixed with the oil in the oil flow path and delivered to various locations of the methanol fuel engine through the lubrication system.
[0006] Furthermore: a compression spring is provided in the one-way valve, which abuts against the valve of the one-way valve and is in a compressed state. When the oil pressure entering the one-way valve reaches a certain threshold, it overcomes the pressure of the compression spring on the valve and opens the valve.
[0007] Furthermore, the lubrication system includes a suction filter, an electronic pump and a filter press. The oil used to lubricate the methanol fuel engine passes through the suction filter, the electronic pump and the filter press in sequence and is then sent to various places in the methanol fuel engine. The cavity is set in the filter press. The filter press includes a shell and a filter element fixedly arranged in the shell. The filter element divides the space in the shell into an area to be filtered and a filtered area. The liquid inlet is connected to the area to be filtered, and the liquid outlet is connected to the filtered area.
[0008] Further: a first channel and a second channel are provided in the cavity, the outer end port of the first channel is located on the outer wall of the cavity, the inner end port of the first channel is located at the top of the cavity and serves as a liquid inlet; the outer end port of the second channel is located on the outer wall of the cavity, the inner end port of the second channel is located at the bottom of the cavity and serves as a liquid outlet.
[0009] Further: the filter element includes an upper end cover and a lower end cover and a cylindrical filter core body fixedly connected therebetween, an oil outlet connected to the hollow part of the filter core body is provided on the upper end cover, a cavity is fixedly provided in the hollow part of the filter core body, a gap for liquid to pass through is left between the side wall of the cavity and the inner wall of the filter core body, a clearance port is provided in the middle part of the lower end cover, the bottom of the cavity is sealed to the clearance port, and the outer end port of the first channel is located in the clearance port; wherein, the area outside the filter core body in the shell is the area to be filtered, and the area inside the filter core body is the filtered area.
[0010] Further: a column is integrated on the bottom surface of the cavity, the top of the column is located at the top of the cavity, a groove is provided on the top surface of the column, a vertical first through hole is opened on the bottom surface of the groove, the lower end port of the first through hole is located on the bottom surface of the outer wall of the cavity, a horizontal second through hole is opened on the side wall of the groove, the outer end port of the second through hole is located on the side wall of the column, and a plug, the compression spring and the valve are arranged in the groove from top to bottom, the plug is fixedly connected to the notch of the groove, the two ends of the compression spring abut on the plug and the valve respectively, and the valve abuts on the inner end port of the first through hole, the first through hole, the second through hole and the groove form the first channel, and the valve, the compression spring, the groove and the plug constitute the one-way valve.
[0011] Furthermore, the second channel is a vertical structure and is located on the inner wall of the cavity, the lower end port of the second channel is its inner end port, and the upper end port of the second channel is its outer end port and is located on the top surface of the cavity.
[0012] Furthermore, when the flux of the filter element decreases and the oil pressure in the area to be filtered increases to greater than a set threshold, the oil in the area to be filtered overcomes the resistance of the compression spring and opens the one-way valve.
[0013] Furthermore, by adjusting the output power of the electronic pump in the lubrication system, the oil pressure entering the one-way valve is increased to be greater than the set threshold value, so as to overcome the resistance of the compression spring and open the valve of the one-way valve.
[0014] Furthermore, the electronic pump increases its output power intermittently according to demand or in time periods according to working conditions.
[0015] The beneficial effects of the present invention are as follows: a cavity for storing corrosion inhibitor is provided, and a one-way valve with a certain opening pressure is provided in the liquid inlet of the cavity. After the engine has been running for a certain period of time, the oil pressure of the oil entering the one-way valve is increased, so that the one-way valve is opened, and the oil enters the interior of the cavity, causing the corrosion inhibitor to enter the lubrication system through the liquid outlet of the cavity, thereby playing the role of adding corrosion inhibitor, so as to prevent the corrosion of metal parts due to the strong corrosiveness of methanol fuel; the filling method of the corrosion inhibitor is changed from filling during maintenance to filling when the engine is running, thereby extending the action time of the corrosion inhibitor in the engine, and thus extending the maintenance mileage. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a flow chart of the present invention; Figure 2 Schematic diagram of the structure of the cavity in the present invention; Figure 3 This is a schematic diagram of the structure of the integrated filter and cavity in the present invention. DETAILED DESCRIPTION
[0017] The present invention will be described in detail below with reference to the accompanying drawings. The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention. The directional terms such as left, center, right, top, and bottom in the embodiments of the present invention are merely relative concepts or are based on the normal use state of the product, and should not be considered as restrictive.
[0018] First embodiment: A method for slow-releasing a corrosion inhibitor for a methanol fuel engine, such as Figure 1 、 Figure 2 and Figure 3 As shown, the lubrication system of the methanol fuel engine and the following steps are included: Step 1: A cavity 3 filled with corrosion inhibitor is provided in the lubrication system, wherein a liquid inlet 31 and a liquid outlet 32 are provided at the top and bottom of the cavity 3, respectively. A one-way valve 6 is provided in the liquid inlet 31, and the one-way valve 6 is used to allow oil (i.e., lubricating oil) to flow into the cavity 3 through the liquid inlet 31 in a one-way direction. A compression spring 62 is provided in the one-way valve 6, and the compression spring 62 abuts against a valve 61 of the one-way valve 6 and is in a compressed state. When the oil pressure of the oil entering the one-way valve 6 reaches a certain threshold, it overcomes the pressure of the compression spring 62 on the valve 61 and opens the valve 61; Step 2: The cavity 3 is located in the oil flow path of the lubrication system; the lubrication system includes a suction filter, an electronic pump and a pressure filter, and the oil used to lubricate the methanol fuel engine is sequentially sent to various places in the methanol fuel engine after passing through the suction filter, the electronic pump and the pressure filter. The lubrication system is a prior art and will not be described in detail here; the cavity 3 is set in the pressure filter, and the pressure filter includes a housing 1 and a filter element 2 fixedly arranged in the housing 1. The filter element 2 separates the space in the housing 1 and forms a to-be-filtered area and a filtered area in the housing 1. In this embodiment, the area outside the filter element 2 in the housing 1 is the to-be-filtered area, and the area inside the filter element 2 is the filtered area. The liquid inlet 31 is connected to the to-be-filtered area, and the liquid outlet 32 is connected to the filtered area. Step 3: By increasing the oil pressure of the oil entering the one-way valve 6, specifically: when the flux of the filter element 2 decreases and the oil pressure of the oil in the area to be filtered increases to greater than the set threshold, at this time, the oil in the area to be filtered overcomes the resistance of the compression spring 62 and opens the valve 61 of the one-way valve 6, and the oil enters the cavity 3 through the liquid inlet 31; wherein, the density of the corrosion inhibitor is less than the density of the oil, under the restriction of the internal space of the cavity 3, the oil entering the upper part of the cavity 3 pushes the corrosion inhibitor in the cavity 3 through the outlet The liquid port 32 squeezes out of the cavity 3; in order to facilitate the corrosion inhibitor to be squeezed out of the cavity 3 and enter the oil flow path after the oil enters the cavity 3, a first channel 35 and a second channel 33 are provided in the cavity 3. The outer end of the first channel 35 is located on the outer wall of the cavity 3, and the inner end of the first channel 35 is located at the top of the cavity 3 and serves as the liquid inlet 31 of the cavity 3; the outer end of the second channel 33 is located on the outer wall of the cavity 3, and the inner end of the second channel 33 is located at the bottom of the cavity and serves as the liquid outlet 32; Step 4: The squeezed corrosion inhibitor is mixed with the oil in the oil flow path and delivered to various parts of the methanol fuel engine through the lubrication system to maintain the metal parts therein, thereby slowly releasing the corrosion inhibitor into the lubrication system, thereby extending the corrosion inhibitor filling time and / or vehicle maintenance time.
[0019] Among them, the filter element 2 includes an upper end cover 21 and a lower end cover 23 and a cylindrical filter core body 22 fixedly connected between the two. An oil outlet 211 connected to the hollow part of the filter core body 22 is provided on the upper end cover 21. The cavity 3 is fixedly arranged in the hollow part of the filter core body 22. A gap for the lubricating oil to pass through is left between the side wall of the cavity 3 and the inner wall of the filter core body 22. A clearance port 231 is provided in the middle of the lower end cover. The bottom of the cavity 3 and the clearance port 231 are sealed. Specifically, a sealing ring for sealing the gap between the bottom of the cavity 3 and the clearance port 231 is provided between the bottom of the cavity 3 and the clearance port 231 to prevent the lubricating oil in the area to be filtered from passing between the cavity 3 and the clearance port 231. The filter element 22 of the housing 1 is provided with a first through-hole 351 which is provided on the bottom surface of the housing 3. The filter element 22 of the housing 1 is provided with a first through-hole 352 which is provided on the bottom surface of the housing 3. The opening is located on the side wall of the column 34, and a plug 63, the compression spring 62 and the valve 61 are arranged in sequence from top to bottom in the groove 353. The plug 63 is fixedly connected to the notch of the groove 353, and the two ends of the compression spring 62 are respectively abutted on the plug 63 and the valve 61. The valve 61 is a steel ball and abuts on the inner end port of the first through hole 351. In order to facilitate cooperation with the valve 61, the inner end of the first through hole 351 is a thin neck structure, and the diameter of the thin neck structure is smaller than the diameter of the steel ball. The first through hole 351, the second through hole 352 and the groove 353 form the first channel 35. The valve 61, the compression spring 62, the groove The groove 353 and the plug 63 constitute the one-way valve 6; the second channel 33 is a vertical structure and is located on the inner wall of the cavity 3, the lower end port of the second channel 33 is its inner end port, and the upper end port of the second channel 33 is its outer end port and is located on the top surface of the cavity 3; the lower end cover 23 and the bottom of the cavity 3 are both snapped onto the bottom surface of the shell 1; the cavity 3 includes a base 37 and a vertical cylinder 36, the lower end of the cylinder is an open structure, and an annular boss 371 is integrated on the edge of the base 37, the lower end port of the cylinder 36 is fixedly sleeved on the annular boss 371, and a sealing ring is provided between the lower end inner wall of the cylinder 36 and the outer wall of the annular boss 371.
[0020] Second embodiment: Other technical features are the same as those of the first embodiment. By adjusting the output power of the electronic pump in the lubrication system, the oil pressure entering the one-way valve 6 is increased to be greater than the set threshold value, so as to overcome the resistance of the compression spring and open the valve of the one-way valve 6, wherein the electronic pump increases its output power intermittently as needed or in time periods according to working conditions.
[0021] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.
Claims
1. A method for slow-releasing a corrosion inhibitor for a methanol fuel engine, characterized in that: The invention includes a lubrication system for a methanol fuel engine and the following steps: Step 1: A cavity filled with corrosion inhibitor is provided in the lubrication system, wherein a liquid inlet and a liquid outlet are provided at the top and bottom of the cavity respectively, and a one-way valve is provided in the liquid inlet to allow oil to flow into the cavity in one direction through the liquid inlet; Step 2: Position the cavity within the oil flow path of the lubrication system; Step 3: By increasing the oil pressure entering the one-way valve, the oil opens the one-way valve and enters the cavity through the liquid inlet. The density of the corrosion inhibitor is lower than that of the oil. Under the restriction of the internal space of the cavity, the oil entering the upper part of the cavity squeezes the corrosion inhibitor out of the cavity through the liquid outlet. Step 4: The squeezed corrosion inhibitor is mixed with the oil in the oil flow path and delivered to various locations of the methanol fuel engine through the lubrication system.
2. The corrosion inhibitor slow-release method for a methanol fuel engine according to claim 1, characterized in that: A compression spring is provided in the one-way valve. The compression spring abuts against the valve of the one-way valve and is in a compressed state. When the oil pressure entering the one-way valve reaches a certain threshold, it overcomes the pressure of the compression spring on the valve and opens the valve.
3. The corrosion inhibitor slow-release method for a methanol fuel engine according to claim 1, characterized in that: The lubrication system includes a suction filter, an electronic pump and a filter press. The oil used to lubricate the methanol fuel engine passes through the suction filter, the electronic pump and the filter press in sequence and is then delivered to various locations within the methanol fuel engine. The cavity is set within the filter press. The filter press includes a shell and a filter element fixedly arranged within the shell. The filter element separates the space within the shell and forms an area to be filtered and an area that has been filtered. The liquid inlet is connected to the area to be filtered, and the liquid outlet is connected to the filtered area.
4. The corrosion inhibitor slow-release method for a methanol fuel engine according to claim 3, characterized in that: A first channel and a second channel are provided in the cavity, the outer end port of the first channel is located on the outer wall of the cavity, the inner end port of the first channel is located at the top of the cavity and serves as a liquid inlet; the outer end port of the second channel is located on the outer wall of the cavity, the inner end port of the second channel is located at the bottom of the cavity and serves as a liquid outlet.
5. The corrosion inhibitor slow-release method for a methanol fuel engine according to claim 4, characterized in that: The filter element includes an upper end cover and a lower end cover and a cylindrical filter element body fixedly connected therebetween; an oil outlet connected to the hollow part of the filter element body is provided on the upper end cover; a cavity is fixedly arranged in the hollow part of the filter element body; a gap for liquid to pass through is left between the side wall of the cavity and the inner wall of the filter element body; a clearance port is provided in the middle part of the lower end cover; the bottom of the cavity is sealed to the clearance port; the outer end port of the first channel is located in the clearance port; wherein, the area outside the filter element body in the shell is the area to be filtered, and the area inside the filter element body is the filtered area.
6. The corrosion inhibitor slow-release method for a methanol fuel engine according to claim 5, characterized in that: A column is integrally arranged on the bottom surface of the cavity, the top of the column is located at the top of the cavity, a groove is provided on the top surface of the column, a vertical first through hole is provided on the bottom surface of the groove, the lower end port of the first through hole is located on the bottom surface of the outer wall of the cavity, a horizontal second through hole is provided on the side wall of the groove, the outer end port of the second through hole is located on the side wall of the column, a plug, the compression spring and the valve are sequentially provided in the groove from top to bottom, the plug is fixedly connected to the notch of the groove, the two ends of the compression spring abut against the plug and the valve respectively, the valve abuts against the inner end port of the first through hole, the first through hole, the second through hole and the groove form the first channel, and the valve, the compression spring, the groove and the plug constitute the one-way valve.
7. The corrosion inhibitor slow-release method for a methanol fuel engine according to claim 5, characterized in that: The second channel is a vertical structure and is located on the inner wall of the cavity. The lower end port of the second channel is its inner end port, and the upper end port of the second channel is its outer end port and is located on the top surface of the cavity.
8. The corrosion inhibitor slow-release method for a methanol fuel engine according to claim 3, characterized in that: When the flux of the filter element decreases and the oil pressure in the area to be filtered increases to greater than the set threshold, the oil in the area to be filtered overcomes the resistance of the compression spring and opens the valve of the one-way valve.
9. The corrosion inhibitor slow-release method for a methanol fuel engine according to claim 1 or 3, characterized in that: By adjusting the output power of the electronic pump in the lubrication system, the oil pressure entering the one-way valve is increased to be greater than the set threshold value to overcome the resistance of the compression spring and open the valve of the one-way valve.
10. The corrosion inhibitor slow-release method for a methanol fuel engine according to claim 9, characterized in that: The electronic pump increases its output power intermittently as required or in time periods according to working conditions.