Pump body of high-pressure pump, high-pressure pump, fuel supply system and engine system

Abstract

The utility model relates to a pump body of a high-pressure pump, the high-pressure pump, a fuel supply system and an engine system. The high-pressure pump is used for supplying supercharged fuel to an engine, and a pump body of the high-pressure pump comprises a first pump body part made of a first material; the first pump body part is made of a first material, the second pump body part is made of a second material different from the first material, the first material has higher corrosion resistance than the second material, and the first pump body part and the second pump body part are fixed together. Therefore, the weight and the cost of the pump body can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of engines, specifically to a pump body for a high-pressure pump, a high-pressure pump, a fuel supply system, and an engine system. Background Technology

[0002] In the engine system, fuel is supplied to the engine via a fuel supply system. To supply fuel to the engine, the fuel supply system draws fuel from the fuel tank and delivers it to a high-pressure pump via a delivery pump (also known as a low-pressure pump or pre-delivery pump). The fuel is pressurized in the high-pressure pump to achieve sufficient injection pressure, thereby ensuring that the fuel can be efficiently injected into the cylinders of the engine.

[0003] With global economic growth and a continuously increasing population, energy demand continues to rise. The supply of traditional petroleum fuels is gradually becoming tighter, and prices are highly volatile, prompting people to seek alternative energy sources. Clean and efficient energy sources such as methanol and natural gas are gradually becoming important alternatives to petroleum fuels.

[0004] High-pressure methanol injection systems are currently in the research and development stage worldwide, and there are no mass-produced products yet. The high-pressure pumps used in research and testing are still borrowed from diesel high-pressure pumps, and the pump bodies of diesel high-pressure pumps are mostly made of aluminum alloy, with some made of cast iron.

[0005] However, methanol on the market is corrosive to the aluminum alloys and cast iron used in existing high-pressure pump bodies. For commonly used aluminum alloys, the main problem is that corrosion produces tiny alumina particles, which can clog fuel injector nozzles or enter the cylinders, damaging the engine. Although hard anodizing aluminum alloy parts can improve their corrosion resistance, it still cannot meet the corrosion resistance requirements throughout the entire pump's lifespan. Therefore, the customer requires that future mass-produced high-pressure pumps must not have any design elements that allow aluminum to come into contact with methanol.

[0006] For the above requirements, an all-stainless steel pump body can be a simple and quick solution, but its disadvantages are also very obvious: the weight and cost of the parts will increase significantly.

[0007] Since stainless steel has a density approximately three times that of aluminum alloy, the weight of the pump body will increase to approximately three times its original weight.

[0008] The cost of raw materials has increased significantly, depending on the final materials used, and can be about 3 to 5 times the original cost, or even higher.

[0009] Stainless steel is not suitable for casting, and the forging process of pump body blanks is difficult and will increase costs significantly.

[0010] Stainless steel pump bodies are difficult to process, with issues such as material sticking to the tool, difficulty in chip breaking, difficulty in ensuring surface roughness, and a high risk of tool breakage, especially in the processing of deep and long holes. As a result, processing costs will increase significantly. Utility Model Content

[0011] The purpose of this application is to solve or at least alleviate some of the problems existing in the prior art.

[0012] A first aspect of this application is to provide a pump body for a high-pressure pump, the high-pressure pump being used to supply pressurized fuel to an engine, wherein the pump body comprises:

[0013] The first pump body part made of the first material; and

[0014] The second pump body portion is made of a second material different from the first material.

[0015] The first material has higher corrosion resistance than the second material.

[0016] The first pump body portion and the second pump body portion are fixed together. Optionally, the first pump body portion and the second pump body portion are detachably fixed together.

[0017] Therefore, only the first pump body portion of the pump body is made of a material with higher corrosion resistance, such as stainless steel, while the second pump body portion of the pump body can be made of a material with lower corrosion resistance, such as aluminum alloy. Thus, the total weight and cost of the pump body will not increase much compared to an all-aluminum alloy pump body, but will be significantly reduced compared to an all-stainless steel pump body, while meeting the requirements for fuel corrosion resistance.

[0018] Optionally, the first pump body portion includes a flow control module, the flow control module having: a fuel inlet; a fuel outlet; a metering valve mounting hole in which a metering valve can be installed; and an overflow valve mounting hole in which an overflow valve can be installed.

[0019] Optionally, the second pump body portion includes: a booster module having at least one booster component mounting hole in which a booster component for boosting the fuel can be installed; and a drive module having a drive component receiving portion in which a drive component for driving the booster component can be installed.

[0020] Optionally, the flow control module of the first pump body portion has a first flow channel system constructed within the wall of the flow control module; and the booster module of the second pump body portion has a second flow channel system constructed within the wall of the booster module, wherein the fuel inlet, fuel outlet, metering valve mounting hole, and overflow valve mounting hole of the flow control module are in fluid communication with the booster component mounting hole of the booster module via the first flow channel system and the second flow channel system.

[0021] Optionally, the inner wall of the second flow channel system of the booster module has an anti-corrosion coating or anti-corrosion plating.

[0022] Therefore, the second pump body section is mainly used to house the booster assembly and drive assembly, and it is the main structural part that bears a large load. Although the second pump body section also has a fuel flow channel system, namely the second flow channel system of the booster module, the flow channel system of the second pump body section is relatively simple and has relatively low dimensional accuracy requirements. Therefore, the inner wall of the flow channel system can be coated or plated with an anti-corrosion material. For example, PTFE (polytetrafluoroethylene) or similar materials such as PFA (perfluoroalkoxyalkane), FEP (fluorinated ethylene propylene copolymer), ECTFE (ethylene-trifluorochloroethylene copolymer) can be used for coating treatment, or high-phosphorus electroless nickel plating and other anti-corrosion treatment methods can be used. Thus, the second pump body section can continue to be manufactured using aluminum alloy material. Of course, it should be noted that when coating or plating the inner wall of the flow channel system of the second pump body section, the high-precision machined areas of the second pump body section used to install the booster assembly and drive assembly need to be treated with resist plating.

[0023] In contrast, the flow control module of the first pump body is mainly used to install flow control components such as metering valves and overflow valves. Therefore, its flow channel system is relatively complex and requires high dimensional accuracy. The accuracy requirements cannot be met after machining tolerances are superimposed on the thickness tolerances of coatings or plating layers. Therefore, relatively easy-to-machine stainless steel materials (such as 17-4PH precipitation-hardening stainless steel) can be used. Controlling the appropriate hardness through heat treatment before machining can reduce the machining difficulty. Although the weight and cost of such stainless steel materials are higher than those of aluminum alloy materials, since the first pump body is not the main structural part of the pump body but only occupies a small portion, the total weight and cost of the pump body will not increase significantly compared to an all-aluminum alloy pump body, but will be significantly lower than that of an all-stainless steel pump body.

[0024] Optionally, the high-pressure pump is a single-fuel high-pressure pump, and the fuel is methanol.

[0025] Optionally, the high-pressure pump is a dual-fuel high-pressure pump, wherein the flow control module has a first fuel inlet, a first fuel outlet, a first metering valve mounting hole, and a first overflow valve mounting hole for the first fuel; and has a second fuel inlet, a second fuel outlet, a second metering valve mounting hole, and a second overflow valve mounting hole for the second fuel; wherein the booster module has at least one first booster component mounting hole for the first fuel, and at least one second booster component mounting hole for the second fuel.

[0026] Optionally, the first fuel is methanol and the second fuel is diesel.

[0027] Optionally, the first material is stainless steel, and the second material is aluminum alloy.

[0028] A second aspect of this application is to provide a high-pressure pump having the aforementioned pump body, metering valve, overflow valve, at least one booster assembly, and drive assembly.

[0029] A third aspect of this application is to provide a fuel supply system including the aforementioned high-pressure pump.

[0030] A fourth aspect of this application is to provide an engine system comprising an engine and the aforementioned fuel supply system for supplying pressurized fuel to the engine. Attached Figure Description

[0031] The embodiments of this application will be described in further detail below with reference to the accompanying drawings. However, those skilled in the art will understand that these drawings are for illustrative purposes only and should not be construed as limiting the scope of this application. The accompanying drawings show:

[0032] Figure 1 This is a perspective view of a high-pressure pump according to one embodiment of this application;

[0033] Figure 2 This is a perspective view of the pump body of a high-pressure pump according to one embodiment of this application;

[0034] Figure 3 This is a perspective view of the first pump body portion of a high-pressure pump body according to one embodiment of this application.

[0035] Figure 4 This is a perspective view of the second pump body portion of a high-pressure pump body according to one embodiment of this application.

[0036] Figure 5 This is an exploded view of the pump body of a high-pressure pump according to one embodiment of this application;

[0037] Figure 6This is a partial cross-sectional view of the pump body of a high-pressure pump according to one embodiment of this application;

[0038] Figure 7 This is a top view of the pump body of a high-pressure pump according to one embodiment of this application;

[0039] Figure 8 yes Figure 7 The diagram shows an AA sectional view of the pump body of the high-pressure pump; and

[0040] Figure 9 yes Figure 7 The image shows a BB cross-sectional view of the pump body of the high-pressure pump. Detailed Implementation

[0041] Figure 1 A perspective view shows a high-pressure pump 60 according to one embodiment of this application. The high-pressure pump 60 is used to supply pressurized fuel to an engine and has a pump body 50.

[0042] like Figure 1 As shown, the pump body 50 includes a first pump body portion 10. Here, the first pump body portion 10 includes a flow control module having a fuel inlet 11 and a fuel outlet 12. Furthermore, a metering valve 18 and an overflow valve 19 are installed in the flow control module. Figure 1 In the illustrated embodiment, the high-pressure pump 60 is implemented as a dual-fuel high-pressure pump. Therefore, although not explicitly stated, those skilled in the art will understand that the flow control module has its own fuel inlet 11, fuel outlet 12, metering valve 18, and overflow valve 19 for each fuel. That is, the flow control module has a first fuel inlet, a first fuel outlet, a first metering valve, and a first overflow valve for the first fuel, and a second fuel inlet, a second fuel outlet, a second metering valve, and a second overflow valve for the second fuel. Here, the first fuel may be, for example, methanol, and the second fuel may be, for example, diesel. However, this application is not limited to this. Figure 1 The dual-fuel high-pressure pump shown can be used as a single-fuel high-pressure pump. In this case, the flow control module may only have one fuel inlet 11, one fuel outlet 12, one metering valve 18, and one overflow valve 19. Here, the fuel may be methanol.

[0043] It should be noted that the fuels listed above are merely examples. The high-pressure pump 60 of this application can be used not only for methanol fuel and / or diesel fuel, but also for other types of fuel.

[0044] Back to Figure 1The pump body 50, in addition to the first pump body portion 10, also includes a second pump body portion 20. Here, the second pump body portion 20 is the main structural part of the pump body 50 that bears heavy loads and includes a booster module 21 and a drive module 25. Figure 1 In the illustrated embodiment, the booster module 21 has three booster components 23. The booster components 23 are used to pressurize the fuel to a sufficient injection pressure, thereby ensuring that the fuel is efficiently injected into the cylinders of the engine. Here, the three booster components 23 are exemplary; depending on the amount of fuel and demand, the booster module 21 may have different numbers of booster components 23. For example, when the high-pressure pump 60 is a single-fuel high-pressure pump, the booster module 21 may have at least one booster component 23. However, even if the high-pressure pump 60 is a single-fuel high-pressure pump, the booster module 21 may have two or more booster components 23. Figure 1 In the illustrated embodiment, the high-pressure pump 60 is a dual-fuel high-pressure pump, therefore a total of three booster assemblies 23 are provided. For example, the two booster assemblies 23 on the right can be used for a first fuel such as methanol, while the leftmost booster assemblies 23 can be used for a second fuel such as diesel. However, those skilled in the art will understand that the three booster assemblies 23 can also be allocated to the first fuel and the second fuel in different ways. Those skilled in the art will also understand that four or more booster assemblies 23 can also be provided for the first fuel and the second fuel. Furthermore, from... Figure 1 As can be seen, a drive component 27 for driving the booster component 23 is installed in the drive module 25.

[0045] Here, the booster assembly 23 can be a pump assembly, particularly a plunger pump assembly, which can be driven by a drive assembly 27 mounted in the drive module 25. The drive assembly 27 can be, for example, a camshaft, thereby driving the reciprocating motion of the plunger of the pump assembly.

[0046] Figure 2A perspective view shows the pump body 50 of a high-pressure pump 60 according to one embodiment of this application. The metering valve 18 and overflow valve 19 installed in the flow control module of the first pump body portion 10, the booster assembly 23 installed in the booster module 21 of the second pump body portion 20, the drive assembly 27 installed in the drive module 25 of the second pump body portion 20, and other accessories have been removed. Therefore, it can be seen more clearly that the flow control module of the first pump body portion 10 has: a fuel inlet 11, a fuel outlet 12, a metering valve mounting hole 13 (in which the metering valve 18 can be installed), and an overflow valve mounting hole 14 (in which the overflow valve 19 can be installed). Furthermore, it can be seen that the second pump body portion 20 includes a booster module 21 and a drive module 25, wherein the booster module 21 has a total of three booster assembly mounting holes 22, in which a booster assembly 23 for pressurizing the fuel can be installed. Figure 2 For the pump body 50 of the dual-fuel high-pressure pump shown, the booster module 21 has at least one first booster component mounting hole for the first fuel (e.g., Figure 2 The two booster assembly mounting holes 22 on the right side, and at least one second booster assembly mounting hole for the second fuel (e.g., Figure 2 (The leftmost booster assembly mounting hole 22). In addition, a drive assembly receiving part 26 is provided in the drive module 25, in which a drive assembly 27 for driving the booster assembly 23 can be installed.

[0047] Figure 3 The first pump body portion 10 of the pump body 50 of a high-pressure pump 60 according to one embodiment of this application is shown in perspective view. Figure 4 A perspective view of the second pump body portion 20 of the pump body 50 of a high-pressure pump 60 according to one embodiment of this application is shown. Figure 3 and Figure 4 Not only can the fuel inlet 11, fuel outlet 12, and overflow valve mounting hole 14 of the flow control module of the first pump body portion 10 be clearly seen, as well as the booster assembly mounting hole 22 and drive assembly receiving portion 26 of the second pump body portion 20, but also the mounting holes and flow passage openings located on the facing surfaces of the first pump body portion 10 and the second pump body portion 20 can be clearly seen. With the aid of these mounting holes and fasteners, the first pump body portion 10 and the second pump body portion 20 can be fixed together. Optionally, the first pump body portion 10 and the second pump body portion 20 can be detachably fixed together. In the fixed state, the flow passage openings of the first pump body portion 10 and the second pump body portion 20 are in fluid communication with each other.

[0048] Here, the first pump body portion 10 can be made of a first material, while the second pump body portion 20 can be made of a second material different from the first material. Optionally, the first material has higher corrosion resistance than the second material. Thus, only the first pump body portion 10 of the pump body 50 is made of a material with higher corrosion resistance, such as stainless steel, while the second pump body portion 20 of the pump body 50 can be made of a material with lower corrosion resistance, such as aluminum alloy. Therefore, the total weight and cost of the pump body 50 will not increase much compared to an all-aluminum alloy pump body, but will be significantly lower than an all-stainless steel pump body.

[0049] Figure 5 An exploded view shows the pump body 50 of a high-pressure pump 60 according to one embodiment of this application. Here, it can be clearly seen that... Figure 3 and Figure 4 The first pump body portion 10 and the second pump body portion 20 shown in the diagram also clearly show fasteners 15 for detachably securing the first pump body portion 10 and the second pump body portion 20 together. Figure 5 The diagram exemplarily shows three fasteners 15 and a seal 16 for achieving a fluid seal between the flow passage openings of the first pump body portion 10 and the second pump body portion 20. Figure 5 Four seals 16 are shown, one for the supply channel and one for the return channel of each fuel. The fasteners 15 described herein could be, for example, bolts. However, this is merely exemplary. The first pump body portion 10 and the second pump body portion 20 can also be fastened together by any other means known in the prior art.

[0050] Figure 6 A partial cross-sectional view shows the pump body 50 of a high-pressure pump 60 according to one embodiment of this application. A portion of a first flow channel system 17 constructed within the wall of the flow control module in the first pump body portion 10 and a portion of a second flow channel system 24 constructed within the wall of the booster module 21 in the second pump body portion 20 are shown here. The fuel inlet 11, fuel outlet 12, metering valve mounting hole 13, and overflow valve mounting hole 14 of the flow control module are in fluid communication with the booster assembly mounting hole 22 of the booster module 21 via the first flow channel system 17 and the second flow channel system 24.

[0051] Figure 7 A top view shows the pump body 50 of a high-pressure pump 60 according to one embodiment of this application. From Figure 7As can be seen, the pump body 50 includes a first pump body portion 10 and a second pump body portion 20. Furthermore, it is clearly visible that the first pump body portion 10 has two overflow valve mounting holes 14, and the second pump body portion 20 has three booster assembly mounting holes 22. Section lines AA and BB are shown here, where section line AA corresponds to the inflow channel of the second flow channel system 24 of the second pump body portion 20, and section line BB corresponds to the return channel of the second flow channel system 24 of the second pump body portion 20.

[0052] Figure 8 It shows Figure 7 The diagram shows a sectional view (AA) of the pump body 50 of the high-pressure pump 60, showing only the second pump body portion 20 and not the first pump body portion 10. Apart from the drive assembly housing 26 in the drive module 25 of the second pump body portion 20, a portion of the second flow channel system 24 in the booster module 21 of the second pump body portion 20 is clearly visible. Specifically, in... Figure 8 The direction of fuel flow in the inflow channel of the second flow channel system 24 is shown by arrows.

[0053] Figure 9 It shows Figure 7 The BB cross-sectional view of the pump body 50 of the high-pressure pump 60 shown here only shows the second pump body portion 20 and not the first pump body portion 10. Besides the drive assembly housing 26 in the drive module 25 of the second pump body portion 20, a portion of the second flow channel system 24 in the booster module 21 of the second pump body portion 20 can also be clearly seen. Specifically, in Figure 9 The direction of fuel flow in the return channel of the second flow channel system 24 is shown by an arrow.

[0054] from Figure 8 and Figure 9As can be seen, the second flow channel system 24 of the second pump body part 20 is relatively simple, and its dimensional accuracy requirements are relatively low. Therefore, the inner wall of the channel of the second flow channel system 24 can be coated or plated with an anti-corrosion material. For example, PTFE (polytetrafluoroethylene) or similar materials such as PFA (perfluoroalkoxyalkane), FEP (fluorinated ethylene propylene copolymer), ECTFE (ethylene-trifluorochloroethylene copolymer) can be used for coating treatment, or high-phosphorus electroless nickel plating and other measures can be used for anti-corrosion treatment. Thus, the second pump body part 20 can continue to be manufactured using aluminum alloy material. Of course, it should be noted that when coating or plating the inner wall of the channel of the flow channel system of the second pump body part 20, the high-precision machining area of ​​the second pump body part 20 used for installing the booster component 23 and the drive component 27 needs to be treated with resist plating.

[0055] The high-pressure pump 60 can be used in the fuel supply system of an engine system to supply pressurized fuel to the engine of the engine system.

[0056] The above descriptions are merely exemplary embodiments of this application. The scope of protection of this application is not limited to the above embodiments, and all technical solutions falling within the concept of this application are within the scope of protection of this application. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of this application should also be considered within the scope of protection of this application.

Claims

1. A pump body (50) of a high-pressure pump (60), said high-pressure pump (60) being used to supply pressurized fuel to an engine, Its features are, The pump body (50) includes: The first pump body part (10) made of the first material; and A second pump body portion (20) made of a second material different from the first material, The first material has higher corrosion resistance than the second material. The first pump body part (10) and the second pump body part (20) are fixed together.

2. The pump body (50) according to claim 1, characterized in that, The first pump body part (10) includes a flow control module, the flow control module having: Fuel inlet (11); Fuel exports (12); A metering valve mounting hole (13) in which a metering valve (18) can be installed; and An overflow valve mounting hole (14) is provided in which an overflow valve (19) can be installed.

3. The pump body (50) according to claim 2, characterized in that, The second pump body part (20) includes: A booster module (21) having at least one booster assembly mounting hole (22) in which a booster assembly (23) for boosting the fuel can be installed; and The drive module (25) has a drive component receiving portion (26) in which a drive component (27) for driving the booster component (23) can be installed.

4. The pump body (50) according to claim 3, characterized in that, The flow control module of the first pump body part (10) has a first flow channel system (17) constructed within the wall of the flow control module; and The booster module (21) of the second pump body part (20) has a second flow channel system (24) constructed within the wall of the booster module (21). The fuel inlet (11), fuel outlet (12), metering valve mounting hole (13), and overflow valve mounting hole (14) of the flow control module are fluidly connected to the booster assembly mounting hole (22) of the booster module (21) via the first flow channel system (17) and the second flow channel system (24). The inner wall of the second flow channel system (24) of the booster module (21) has an anti-corrosion coating or anti-corrosion plating.

5. The pump body (50) according to claim 3, characterized in that, The high-pressure pump (60) is a single-fuel high-pressure pump, and the fuel is methanol; or The high-pressure pump (60) is a dual-fuel high-pressure pump, wherein the flow control module has a first fuel inlet, a first fuel outlet, a first metering valve mounting hole and a first overflow valve mounting hole for the first fuel, and a second fuel inlet, a second fuel outlet, a second metering valve mounting hole and a second overflow valve mounting hole for the second fuel, wherein the booster module (21) has at least one first booster component mounting hole for the first fuel and at least one second booster component mounting hole for the second fuel.

6. The pump body (50) according to claim 5, characterized in that, The first fuel is methanol and the second fuel is diesel.

7. The pump body (50) according to claim 1, characterized in that, The first material is stainless steel, and the second material is aluminum alloy.

8. A high-pressure pump (60), characterized in that, The high-pressure pump (60) has: Pump body (50) according to any one of claims 1 to 7; Metering valve (18); Overflow valve (19); At least one booster assembly (23); and Driver component (27).

9. A fuel supply system, characterized in that, The fuel supply system includes the high-pressure pump (60) according to claim 8.

10. An engine system comprising an engine, Its features are, The engine system further includes a fuel supply system according to claim 9 for supplying pressurized fuel to the engine.

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