Methanol supply system of engine

Abstract

The utility model discloses an engine methanol supply system which comprises a fuel pipeline, the fuel pipeline comprises a feeding pipeline, and a fuel stop valve and a pressure regulating valve are sequentially arranged on the feeding pipeline in the flowing direction of methanol. The methanol supply system further comprises a methanol rail pipe arranged on an engine body of the engine, the methanol rail pipe is provided with a methanol feeding port, and the feeding pipeline is communicated with the methanol feeding port. The methanol rail pipe is further provided with a rail pipe branch pipe, and methanol is supplied to the machine body through the rail pipe branch pipe; the methanol supply system of the engine further comprises a box body, and the fuel stop valve and the pressure regulating valve are both arranged in the box body. Through the use of the fuel stop valve and the pressure regulating valve, the methanol supply system of the engine can realize rapid and stable control of methanol pressure in the methanol rail pipe in a steady state and a transient state, and can improve the pressure stability of methanol injection from the methanol rail pipe to the engine body, thereby improving the working reliability of the engine.

Description

Technical Field

[0001] The utility model belongs to the technical field of engines, and in particular relates to a methanol supply system for an engine. Background Art

[0002] With the application of methanol fuel engines on ships, the engine has increasingly higher requirements for the pressure stability of methanol injection and the supply responsiveness when the load changes. Since methanol is a liquid fuel and is incompressible, it is difficult to achieve a relatively stable pressure in transient fuel conditions.

[0003] In existing application solutions, a variable frequency pump plus bypass adjustment method is often used, or a pressure buffer device is added to the pipeline.

[0004] In the existing application technology solutions, the variable frequency pump plus bypass pressure regulation method requires collecting pressure signal feedback after decompression, and then adjusting the speed or bypass opening through the electronic control actuator. The action is relatively slow and the adjustment time is long, which is not conducive to transient control. The method of adding a pressure buffer device requires accurate matching calculation of the engine and the supply system to meet the requirements of normal working conditions and load mutation working conditions. Insufficient matching accuracy can easily cause insufficient or excessive buffering, which in turn leads to pressure fluctuations. It is difficult to implement and is not conducive to popularization. Summary of the invention

[0005] In view of the above deficiencies in the prior art, the utility model provides an engine methanol supply system, which can improve the pressure stability of methanol injection and thus improve the reliability of engine operation.

[0006] In order to solve the above technical problems, the technical solution of the utility model is:

[0007] A methanol supply system for an engine comprises: a fuel pipeline, wherein the fuel pipeline comprises a feed pipeline, wherein a fuel shut-off valve and a pressure regulating valve are sequentially arranged on the feed pipeline along the flow direction of methanol; the methanol supply system further comprises a methanol rail pipe arranged on a body of the engine, wherein the methanol rail pipe is provided with a methanol feed port, and the feed pipeline is connected to the methanol feed port; the methanol rail pipe is further provided with a rail pipe branch pipe, and methanol is supplied to the body through the rail pipe branch pipe; the engine methanol supply system further comprises a box body, wherein the fuel shut-off valve and the pressure regulating valve are both arranged in the box body.

[0008] Furthermore, a filter is also provided on the feed pipeline, and the filter is provided upstream of the fuel cut-off valve; the filter is provided in the box.

[0009] Furthermore, the fuel pipeline also includes a return pipeline, a methanol return port is provided on the methanol rail pipe, the return pipeline is connected to the methanol return port, and at the same time, the return pipeline is connected to the feed pipeline between the filter and the fuel shut-off valve.

[0010] Furthermore, a pressure relief valve is provided on the return pipeline, and the pressure relief valve is provided in the box body.

[0011] Furthermore, the feed pipeline is connected with a residual liquid drain branch A, the residual liquid drain branch A is located between the filter and the fuel cut-off valve, the residual liquid drain branch A is provided with a residual liquid drain valve A, and the residual liquid drain valve A is arranged in the box body.

[0012] Furthermore, the feed pipeline is connected with a residual liquid discharge branch B, the residual liquid discharge branch B is located between the fuel cut-off valve and the pressure regulating valve, the residual liquid discharge branch B is provided with a residual liquid discharge valve B, and the residual liquid discharge valve B is provided in the box body.

[0013] Furthermore, the engine methanol supply system also includes a purge component, the purge component includes a purge pipeline, the purge pipeline is connected to the return pipeline, the purge pipeline is provided with a purge stop valve, and the purge stop valve is arranged in the box body.

[0014] Furthermore, the purge pipeline is connected to the return pipeline between the machine body and the pressure release valve.

[0015] Furthermore, when the purge assembly is performing purge, the gas flowing in the purge pipeline is nitrogen.

[0016] Furthermore, the engine methanol supply system is suitable for marine engines.

[0017] After adopting the above technical solution, the beneficial effects of the utility model are:

[0018] The engine methanol supply system includes a fuel pipeline, and the fuel pipeline includes a feed pipeline. A fuel shutoff valve and a pressure regulating valve are sequentially arranged on the feed pipeline along the flow direction of methanol. The methanol supply system also includes a methanol rail pipe arranged on the engine body, the methanol rail pipe is provided with a methanol feed port, and the feed pipeline is connected to the methanol feed port; the methanol rail pipe is also provided with a rail pipe branch pipe, and methanol is supplied to the engine body through the rail pipe branch pipe; the engine methanol supply system also includes a box body, and the fuel shutoff valve and the pressure regulating valve are both arranged in the box body. Through the use of the fuel shutoff valve and the pressure regulating valve, the engine methanol supply system of the utility model can realize the rapid and stable control of the methanol pressure in the methanol rail pipe under steady state and transient state, and can improve the pressure stability of the methanol rail pipe to the engine body. Methanol injection, thereby improving the reliability of engine operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the engine methanol supply system of the utility model;

[0020] In the figure, the solid arrows indicate the flow direction of methanol;

[0021] In the figure, the hollow arrows indicate the flow direction of nitrogen;

[0022] In the figure, 1. filter; 21. residual liquid drain valve A; 22. residual liquid drain valve B; 3. fuel shut-off valve; 4. pressure regulating valve; 5. feed pipeline; 6. purge shut-off valve; 71. residual liquid drain branch A; 72. residual liquid drain branch B; 8. methanol rail pipe; 81. methanol feed port; 82. methanol return port; 9. return pipeline; 10. casing; 11. pressure release valve; 12. machine body; 13. rail pipe branch; 14. purge pipeline. DETAILED DESCRIPTION

[0023] The wire harness storage device of the present invention will be further described below in conjunction with the accompanying drawings.

[0024] Combination Figure 1 As shown, an engine methanol supply system includes a fuel pipeline, which includes a feed pipeline 5. Along the flow direction of methanol, a fuel shut-off valve 3 and a pressure regulating valve 4 are sequentially arranged on the feed pipeline 5. The pressure regulating valve 4 is preferably a self-acting pressure regulating valve. The fuel shut-off valve 3 is preferably an automatic fuel shut-off valve.

[0025] The methanol supply system further includes a methanol rail pipe 8 disposed on the engine body 12, the methanol rail pipe 8 is provided with a methanol feed port 81, and the feed pipeline 5 is connected to the methanol feed port 81. According to the number of cylinders of the engine, the methanol rail pipe 8 is also provided with a corresponding number of rail pipe branches 13, and each rail pipe branch 13 is provided with a solenoid valve (not shown in the figure), which is used to realize the on and off of methanol in the rail pipe branch 13, and supply methanol to each cylinder of the engine through the rail pipe branch 13.

[0026] The engine methanol supply system further includes a box body 10 , in which the fuel cut-off valve 3 and the pressure regulating valve 4 are both arranged.

[0027] Preferably, a filter 1 is further provided on the feed pipeline 5 , and the filter 1 is provided upstream of the fuel cut-off valve 3 ; the filter 1 is provided in the box body 10 .

[0028] Further preferably, the fuel pipeline also includes a return pipeline 9, a methanol return port 82 is provided on the methanol rail pipe 8, the return pipeline 9 is connected to the methanol return port 82, and at the same time, the return pipeline 9 is connected to the feed pipeline 5 between the filter 1 and the fuel shut-off valve 3.

[0029] A pressure relief valve 11 is provided on the return pipeline 9 , and the pressure relief valve 11 is arranged in the box body 10 .

[0030] Preferably, the feed pipeline 5 is connected with a residual liquid drain branch A 71, which is located between the filter 1 and the fuel cut-off valve 3, and a residual liquid drain valve A 21 is provided on the residual liquid drain branch A 71, which is provided in the box 10. The residual liquid drain valve A 21 is preferably an automatic residual liquid drain valve A.

[0031] Further preferably, the feed pipeline 5 is also connected with a residual liquid discharge branch B 72, which is located between the fuel cut-off valve 3 and the pressure regulating valve 4. A residual liquid discharge valve B 22 is provided on the residual liquid discharge branch B 72, and the residual liquid discharge valve B 22 is provided in the box body 10. The residual liquid discharge valve B 22 is preferably an automatic residual liquid discharge valve B.

[0032] After the residual liquid flows through the residual liquid discharge valve A 21 and the residual liquid discharge valve B 22 , the residual liquid discharge branch A 71 and the residual liquid discharge branch B 72 merge into one pipeline and extend out of the box body 10 .

[0033] Preferably, the engine methanol supply system further comprises a purge assembly, the purge assembly comprises a purge pipeline 14, the purge pipeline 14 is connected to the return pipeline 9, a purge stop valve 6 is arranged on the purge pipeline 14, and the purge stop valve 6 is arranged in the box 10. The purge stop valve 6 is preferably an automatic purge stop valve.

[0034] Preferably, the purge pipeline 14 is connected to the return pipeline 9 between the machine body 12 and the pressure release valve 11 .

[0035] Further preferably, when the purge assembly is purging, the gas flowing in the purge pipeline 14 is nitrogen.

[0036] The box 10 integrates a methanol filter 1, an automatic fuel shut-off valve, a residual liquid drain valve A 21, a residual liquid drain valve B 22, a pressure release valve 11, a self-operated pressure regulating valve, and a purge shut-off valve 6, so that the positions of the valves are more centralized and the structure is more compact. At the same time, it is also convenient to monitor the valves, which is more conducive to the reliable operation of the valves.

[0037] The process and working principle of each valve opening and closing under the action of the electronic control unit are common knowledge to those skilled in the art and will not be elaborated here.

[0038] The engine methanol supply system of the utility model is suitable for marine engines.

[0039] The process of supplying methanol to an engine using the engine methanol supply system of the utility model is described in detail as follows:

[0040] Methanol flows from upstream to filter 1, where it is first filtered. The filtering accuracy depends on the needs of the engine. After being filtered by filter 1, methanol flows into fuel cut-off valve 3, and then flows to methanol feed port 81 through feed pipe 5 after pressure regulation and stabilization by pressure regulating valve 4, and enters methanol rail pipe 8 through methanol feed port 81. When methanol needs to be supplied to the engine, the solenoid valve on rail pipe branch 13 is opened, and methanol enters each cylinder of the engine through rail pipe branch 13 to meet the needs of the engine.

[0041] After methanol comes out of the methanol return port 82 of the methanol rail 8, it enters the pressure relief valve 11 through the return pipe 9, and the return pipe 9 is connected between the filter 1 and the fuel cut-off valve 3. The pressure relief valve 11 remains closed when the pressure is lower than the set pressure value; when the pressure exceeds the set pressure value, it opens to release the pressure, forming a reflux and re-entering the fuel cut-off valve 3. The pressure value set for the pressure relief valve 11 depends on the specific engine model, which is common knowledge to those skilled in the art and will not be repeated here.

[0042] Methanol has certain toxicity. To ensure safety, nitrogen is often used for purging during parking or maintenance. Open the purge stop valve 6 and the fuel stop valve 3 at the same time to reversely purge the methanol in the return pipeline 9, the methanol rail 8, and the feed pipeline 5. After the purge is completed, close the purge stop valve 6 and the fuel stop valve 3. Install the residual liquid discharge valve A 21 between the filter 1 and the fuel stop valve 3, and install the residual liquid discharge valve B 22 between the fuel stop valve 3 and the pressure regulating valve 4 to discharge the methanol remaining in the feed pipeline 5 before and after the fuel stop valve 3 after nitrogen purge. If only the feed pipeline 5 and the return pipeline 9 downstream of the filter 1 need to be repaired, only the residual liquid discharge valve B 22 can be opened to discharge the residual liquid; if all pipelines downstream and upstream of the filter 1 need to be repaired, both the residual liquid discharge valve A 21 and the residual liquid discharge valve B 22 can be opened to discharge the residual liquid to ensure the safety of maintenance.

[0043] When the engine is running stably, the methanol injection volume is basically stable, and the supply of stable pressure and flow can be achieved simply through the self-operated pressure regulating valve. When the load suddenly increases, the sudden change of the increase in the methanol demand injection volume will cause the supply pressure to drop. The rapid response of the mechanical feedback mechanism of the self-operated pressure regulating valve can maintain the rapid stabilization of the methanol pressure in the methanol rail pipe 8, and the pressure release valve 11 remains closed at this time. When the load suddenly decreases, the sudden change of the decrease in the methanol demand injection volume will cause the supply pressure to rise. It is difficult to maintain the rapid stabilization of the methanol pressure in a short time through the adjustment of the self-operated pressure regulating valve. The pressure will exceed the set value of the pressure release valve 11 for pressure relief, thereby quickly achieving the stabilization of the methanol pressure and meeting the stable supply of methanol under various engine working conditions.

[0044] The technical features named with serial numbers involved in this specification (such as residual liquid drain branch A, residual liquid drain branch B, residual liquid drain valve A, residual liquid drain valve B, etc.) are only for distinguishing the various technical features and do not represent the positional relationship, installation sequence and working sequence between the various technical features.

[0045] The present utility model is not limited to the above-mentioned specific implementation modes. Various changes made by ordinary technicians in this field based on the above-mentioned concepts without creative work all fall within the protection scope of the present utility model.

Claims

1. An engine methanol supply system, characterized in that: include: A fuel pipeline, wherein the fuel pipeline includes a feed pipeline, and a fuel shut-off valve and a pressure regulating valve are sequentially arranged on the feed pipeline along the flow direction of methanol; the methanol supply system also includes a methanol rail pipe arranged on the engine body, the methanol rail pipe is provided with a methanol feed port, and the feed pipeline is connected to the methanol feed port; the methanol rail pipe is also provided with a rail pipe branch pipe, and methanol is supplied to the engine body through the rail pipe branch pipe; The engine methanol supply system further comprises a box body, in which the fuel cut-off valve and the pressure regulating valve are both arranged.

2. The engine methanol supply system according to claim 1, characterized in that: The feed pipeline is also provided with a filter, and the filter is arranged upstream of the fuel cut-off valve; the filter is arranged in the box.

3. The engine methanol supply system according to claim 2, characterized in that: The fuel pipeline also includes a return pipeline. A methanol return port is provided on the methanol rail pipe. The return pipeline is connected to the methanol return port. At the same time, the return pipeline is connected to the feed pipeline between the filter and the fuel shut-off valve.

4. The engine methanol supply system according to claim 3, characterized in that: The return pipeline is provided with a pressure relief valve, and the pressure relief valve is arranged in the box body.

5. The engine methanol supply system according to claim 4, characterized in that: The feed pipeline is connected with a residual liquid drain branch A, the residual liquid drain branch A is located between the filter and the fuel cut-off valve, the residual liquid drain branch A is provided with a residual liquid drain valve A, and the residual liquid drain valve A is provided in the box body.

6. The engine methanol supply system according to claim 5, characterized in that: The feed pipeline is connected with a residual liquid discharge branch B, the residual liquid discharge branch B is located between the fuel cut-off valve and the pressure regulating valve, the residual liquid discharge branch B is provided with a residual liquid discharge valve B, and the residual liquid discharge valve B is provided in the box body.

7. The engine methanol supply system according to claim 6, characterized in that: The engine methanol supply system further comprises a purge component, wherein the purge component comprises a purge pipeline, wherein the purge pipeline is connected to the return pipeline, and a purge stop valve is arranged on the purge pipeline, and the purge stop valve is arranged in the housing.

8. The engine methanol supply system according to claim 7, characterized in that: The purge pipeline is communicated with the return pipeline between the machine body and the pressure release valve.

9. The engine methanol supply system according to claim 8, characterized in that: When the purge assembly is performing purge, the gas flowing in the purge pipeline is nitrogen.

10. The engine methanol supply system according to any one of claims 1 to 9, characterized in that: The engine methanol supply system is suitable for marine engines.

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