Feeding pump for supplying low-pressure methanol

Abstract

The invention relates to a feed pump for low-pressure methanol supply. The device comprises a mounting body, the mounting body is provided with an alcohol inlet connector, an alcohol conveying pump cavity, an alcohol outlet connector, an alcohol return connector and a pressure regulating valve cavity, the alcohol conveying pump cavity is communicated with the alcohol inlet connector and the alcohol outlet connector, and the pressure regulating valve cavity is communicated with the alcohol outlet connector; the alcohol conveying pump comprises a driving shaft rotationally connected to the mounting body and a rotor matching part connected with the driving shaft and arranged in the alcohol conveying pump cavity; wherein methanol flows through the rotor matching part after entering the methanol conveying pump cavity through the methanol inlet connector, the methanol is conveyed to the methanol outlet connector after being pressurized by the rotor matching part, and meanwhile, the pressure regulating valve cavity can regulate the conveying pressure of the methanol and the methanol flows out through the methanol return connector. The low-pressure methanol supply system can provide stable low-pressure methanol supply for the engine, the manufacturing and maintenance cost is reduced, and the reliability is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of low-pressure fuel supply, and in particular to a feed pump used for low-pressure methanol supply. Background Art

[0002] At present, low-pressure supply pumps for vehicles on the market are mainly used to transport traditional fuels such as diesel, gasoline, lubricating oil and cooling water. These fuels have made the existing low-pressure supply pump technology mature in long-term applications. However, with the urgent need to achieve the dual-carbon goals in the transportation field and the advancement of energy structure transformation, various new alternative fuels have gradually emerged, such as methanol, dimethyl ether, liquid ammonia and other low-carbon fuels. Compared with traditional gasoline and diesel, these fuels have significant advantages in clean emissions and can effectively reduce pollutant emissions.

[0003] However, the physical and chemical properties of new alternative fuels are significantly different from those of traditional fuels. For example, methanol has characteristics such as corrosiveness, low viscosity and poor lubricity, which makes it difficult for existing low-pressure supply pumps to meet its use requirements. In addition, although electric methanol pumps have been put into use on the market, they are insufficient in reliability and are prone to damage or frequent failures.

[0004] Therefore, how to develop a low-pressure supply pump that can reliably transport new alternative fuels such as methanol has become an urgent problem to be solved in the industry. Summary of the invention

[0005] To this end, the present invention provides a feed pump for low-pressure methanol supply, which integrates a pressure control function and can provide a stable low-pressure methanol supply to the engine, ensuring the normal operation of the engine and significantly improving reliability.

[0006] In order to solve the above technical problems, the present invention provides a feed pump for low-pressure methanol supply, comprising: The mounting body is provided with an alcohol inlet interface, an alcohol delivery pump chamber, an alcohol outlet interface, an alcohol return interface, and a pressure regulating valve chamber, wherein the alcohol delivery pump chamber is respectively connected to the alcohol inlet interface and the alcohol outlet interface, and the pressure regulating valve chamber is connected to the alcohol outlet interface; An alcohol delivery pump, comprising a drive shaft rotatably connected to the mounting body and a rotor pair connected to the drive shaft and disposed in a cavity of the alcohol delivery pump; Among them, after methanol enters the alcohol delivery pump cavity through the alcohol inlet interface, it flows through the rotor pair. After the methanol is pressurized by the rotor pair, it is delivered to the alcohol outlet interface. At the same time, the pressure regulating valve cavity can adjust the delivery pressure of the methanol and flow out through the alcohol return interface.

[0007] In one embodiment of the present invention, the mounting body comprises a pump body and an alcohol delivery pump cover connected to the pump body; The alcohol inlet interface and the alcohol outlet interface are respectively arranged on the alcohol delivery pump cover, and the alcohol delivery pump cavity and the alcohol outlet interface are arranged on the pump body; The pump body is also provided with an overflow cavity communicated with the pressure regulating valve cavity, and the alcohol delivery pump cover is also provided with an internal oil passage respectively communicated with the alcohol outlet interface and the overflow cavity.

[0008] In one embodiment of the present invention, a flange cavity is provided on one end of the pump body away from the alcohol delivery pump cover, and the mounting body further comprises a mounting flange mounted on the pump body through the flange cavity; It also includes a first skeleton oil seal and a second skeleton oil seal, a lubricating oil channel is formed between the mounting flange and the pump body, the first skeleton oil seal and the second skeleton oil seal are arranged opposite to each other and are respectively arranged in the inner holes of the mounting flange and the pump body, and the second skeleton oil seal is located on one side of the rotor pair; Wherein, the lubricating oil can flow through the first skeleton oil seal and the second skeleton oil seal through the lubricating oil channel.

[0009] In one embodiment of the present invention, the first skeleton oil seal is a one-way skeleton oil seal; the second skeleton oil seal is a two-way skeleton oil seal.

[0010] In one embodiment of the present invention, a sliding bearing sleeved on the drive shaft and located beside the first skeleton oil seal is arranged in the inner hole of the mounting flange; The mounting flange is provided with at least one pressure balancing hole extending from the axial outer end of the mounting flange to the sliding bearing; A drive shaft thrust surface is provided at the axial outer end of the drive shaft close to the mounting flange or at one end of the mounting flange close to the drive shaft; A gap is formed between the inner hole of the sliding bearing and the drive shaft, and the thrust surface of the drive shaft includes an oil groove and a limiting plane, and the limiting plane is used for axial limiting of the drive shaft; The splashed lubricating oil can enter the gap through the oil groove and / or enter the sliding bearing through the pressure balance hole to lubricate the sliding bearing.

[0011] In one embodiment of the present invention, a retaining ring is further included which is sleeved on the drive shaft, and the retaining ring is close to the axial inner end of the mounting flange to limit the axial movement of the drive shaft.

[0012] In one embodiment of the present invention, two sealing plugs are respectively provided at the radial ends of the mounting flange, which are respectively used for oil filling and oil draining of the lubricating oil channel.

[0013] In one embodiment of the present invention, a pressure regulating valve is arranged in the pressure regulating valve chamber.

[0014] In one embodiment of the present invention, the pressure regulating valve chamber is provided with a sealing plane and a radial sealing ring groove which are sealed with the pressure regulating valve.

[0015] In one embodiment of the present invention, at least one of the following features is also included: A first sealing ring, arranged between the radial outer peripheral end of the outer side of the mounting flange and the engine drive wheel; A second sealing ring is arranged between the radial outer peripheral end of the inner side of the mounting flange and the flange cavity; A third sealing ring is arranged between the alcohol delivery pump cavity and the alcohol delivery pump cover; The fourth sealing ring is arranged between the overflow cavity and the alcohol delivery pump cover.

[0016] The above technical solution of the present invention has the following advantages compared with the prior art: The feed pump for low-pressure methanol supply described in the present invention integrates a low-pressure pressure regulating function and can provide low-pressure fuel with corresponding pressure and flow according to the working requirements of the engine.

[0017] The feed pump of the present invention does not need to be specially provided with a lubricating oil circuit, but utilizes the splashing of the lubricating oil of the engine gear box to lubricate the pump body, lubricates the pump body through one-time oil injection inside, and splashes the lubricating oil of the engine gear box outside, which has a simple structure and reduces the complexity of design and maintenance. The lubricating oil enters the sliding bearing through the pressure balance hole and the oil groove, and is sealed by the first and second skeleton oil seals to ensure that the lubricating oil and methanol do not cross each other.

[0018] The feed pump of the present invention is corrosion-resistant and can be used for low-viscosity fuels. The first skeleton oil seal is a one-way oil seal, and the second skeleton oil seal is a two-way oil seal, forming double protection to prevent methanol from leaking into the engine gear box and avoid leakage problems caused by oil seal damage. In addition, sealing rings are arranged at multiple key positions of the feed pump to enhance the overall sealing performance.

[0019] The components of the present invention involving methanol flow, such as the pump body, the drive shaft, the oil pump and the pressure regulating valve, are made of stainless steel to improve the overall reliability and safety. The components can also withstand the corrosiveness of fuels such as methanol, ensuring long-term durability under conditions of low viscosity and corrosiveness of methanol. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the feed pump of the present invention.

[0022] Figure 2 It is a schematic cross-sectional view of the feed pump of the present invention.

[0023] Figure 3 yes Figure 2 A partial enlarged schematic diagram of .

[0024] Figure 4 It is a schematic diagram of the lubrication structure of the feed pump of the present invention.

[0025] Description of the Figures in the Specification: 1. Pump body; 101. Alcohol delivery pump chamber; 102. Flange chamber; 103. Pressure regulating valve chamber; 104. Overflow chamber; 105. Second skeleton oil seal; 106. Second sealing ring; 107. Third sealing ring; 108. Fourth sealing ring; 109. Alcohol return interface; 2. Mounting flange; 201. First skeleton oil seal; 202. Pressure balance hole; 203. Sliding bearing; 204. Drive shaft thrust surface; 205. First sealing ring; 206. Sealing plug; 3. Drive shaft; 4. Alcohol return joint; 5. Pressure regulating valve; 6. Alcohol delivery pump; 601. Internal oil channel; 602. Alcohol outlet interface; 603. Alcohol inlet interface; 604. Alcohol delivery pump cover; 605. Rotor pair; 7. Alcohol outlet connector; 8. Alcohol inlet connector; 9. Key; 10. Retaining ring. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0027] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0028] In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present invention, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0030] Reference Figure 1 , Figure 2 As shown, a feed pump for low-pressure methanol supply of the present invention comprises: The mounting body is provided with an alcohol inlet interface 603, an alcohol delivery pump chamber 101, an alcohol outlet interface 602, an alcohol return interface 109, and a pressure regulating valve chamber 103. The alcohol delivery pump chamber 101 is respectively connected to the alcohol inlet interface 603 and the alcohol outlet interface 602, and the pressure regulating valve chamber 103 is connected to the alcohol outlet interface 602; The alcohol delivery pump 6 comprises a driving shaft 3 rotatably connected to the mounting body and a rotor pair 605 connected to the driving shaft 3 and disposed in the alcohol delivery pump cavity 101; Among them, after methanol enters the alcohol delivery pump chamber 101 through the alcohol inlet interface 603, it flows through the rotor pair 605. After the methanol is pressurized by the rotor pair 605, it is delivered to the alcohol outlet interface 602. At the same time, the pressure regulating valve chamber 103 can adjust the delivery pressure of the methanol and flow out through the alcohol return interface 109.

[0031] Through the above arrangement, it is possible to provide low-pressure fuel with corresponding pressure and flow according to the working requirements of the engine.

[0032] Specifically, the driving shaft 3 drives the rotor pair 605 to rotate and work to complete the methanol pressurization process through the key 9 installed. The alcohol outlet interface 602, the alcohol inlet interface 603, and the alcohol return interface 109 are respectively provided with an alcohol outlet connector 7, an alcohol inlet connector 8, and an alcohol return connector 4.

[0033] In one embodiment, the installation body includes a pump body 1 and an alcohol delivery pump cover 604 connected to the pump body 1; The alcohol inlet interface 603 and the alcohol outlet interface 602 are respectively arranged on the alcohol delivery pump cover 604, and the alcohol delivery pump cavity 101 and the alcohol outlet interface 602 are arranged on the pump body 1; The pump body 1 is further provided with an overflow chamber 104 communicating with the pressure regulating valve chamber 103 , and the alcohol delivery pump cover 604 is further provided with an internal oil passage 601 communicating with the alcohol outlet interface 602 and the overflow chamber 104 , respectively.

[0034] In one embodiment, a flange cavity 102 is provided on one end of the pump body 1 away from the alcohol delivery pump cover 604, and the mounting body further comprises a mounting flange 2 mounted on the pump body 1 through the flange cavity 102; It also includes a first skeleton oil seal 201 and a second skeleton oil seal 105, a lubricating oil passage is formed between the mounting flange 2 and the pump body 1, the first skeleton oil seal 201 and the second skeleton oil seal 105 are arranged opposite to each other and are respectively arranged in the inner holes of the mounting flange 2 and the pump body 1, and the second skeleton oil seal 105 is located on one side of the rotor pair 605; The lubricating oil can flow through the first skeleton oil seal 201 and the second skeleton oil seal 105 through the lubricating oil channel.

[0035] In one embodiment, referring to Figure 3 As shown, the first skeleton oil seal 201 adopts a one-way skeleton oil seal; the second skeleton oil seal 105 adopts a two-way skeleton oil seal, which can prevent methanol and lubricating oil from flowing into each other on both sides. The one-way skeleton oil seal can prevent the two-way skeleton oil seal from being damaged and leaking abnormally, and then seal again through the one-way skeleton oil seal, thereby preventing methanol from leaking into the engine gearbox and damaging the engine through double-layer protection.

[0036] In one embodiment, a sliding bearing 203 is provided in the inner hole of the mounting flange 2 and is sleeved on the drive shaft 3 and located beside the first skeleton oil seal 201; The mounting flange 2 is provided with at least one pressure balancing hole 202 extending from the axial outer end of the mounting flange 2 to the sliding bearing 203; A drive shaft thrust surface 204 is provided at the axial outer end of the drive shaft 3 close to the mounting flange 2 or at one end of the mounting flange 2 close to the drive shaft 3; A (radial) gap is formed between the inner hole of the sliding bearing 203 and the drive shaft 3. The drive shaft thrust surface 204 includes an oil groove and a limiting plane. The limiting plane is used for axial limitation of the drive shaft 3 to prevent the drive shaft 3 from moving toward the oil pump end. Exemplarily, the oil groove extends radially to the gap.

[0037] Reference Figure 4 As shown, the splashed lubricating oil can enter the gap through the oil groove and / or enter the sliding bearing 203 through the pressure balance hole 202 to lubricate the sliding bearing 203, thereby forming a lubrication system of the feed pump and playing a role in lubricating the sliding bearing 203.

[0038] Through the above arrangement, the feed pump does not need to be specially provided with a lubricating oil circuit, but utilizes the splashing of the lubricating oil of the engine gearbox to lubricate the pump body 1, lubricates the pump body 1 through a one-time oil injection inside, and splashes the lubricating oil of the engine gearbox outside, which has a simple structure and reduces the complexity of design and maintenance. The lubricating oil enters the sliding bearing 203 through the pressure balance hole 202 and the oil groove, and is sealed by the first and second skeleton oil seals 105 to ensure that there is no mutual channeling between the lubricating oil and methanol.

[0039] It can be understood that the pressure balance hole 202 mainly balances the pressure on both sides of the sliding bearing 203 in the axial direction, which is more conducive to the lubricating oil entering the gap between the drive shaft 3 and the sliding bearing 203. Exemplarily, the pressure balance holes 202 are evenly distributed along the circumferential axis of the inner hole of the mounting flange 2, and the pressure balance holes 202 are inclined downward toward the sliding bearing 203, which further facilitates the inflow of lubricating oil.

[0040] In one embodiment, it further includes a retaining ring 10 sleeved on the driving shaft 3, wherein the retaining ring 10 is close to the axial inner end of the mounting flange 2 to limit the axial movement of the driving shaft 3 (toward the driving end).

[0041] In one embodiment, two sealing plugs 206 are respectively provided at the radial ends of the mounting flange 2, which are respectively used for filling and draining the lubricating oil passage, so as to facilitate subsequent maintenance.

[0042] In one embodiment, a pressure regulating valve 5 is disposed in the pressure regulating valve cavity 103. The pressure regulating valve cavity 103 is provided with a sealing plane and a radial sealing ring groove that are sealed with the pressure regulating valve 5 to prevent methanol from leaking out of the pump.

[0043] In one embodiment, referring to Figure 2 As shown, in order to improve the overall sealing performance, a first sealing ring 205, a second sealing ring 106, a third sealing ring 107, and a fourth sealing ring 108 are further provided; The first sealing ring 205 is arranged between the radial outer peripheral end of the outer side of the mounting flange 2 and the engine driving wheel to prevent the driving side lubricating oil from leaking out of the pump; The second sealing ring 106 is disposed between the radial outer peripheral end of the inner side of the mounting flange 2 and the flange cavity 102 to prevent the lubricating oil in the flange cavity 102 from leaking out of the pump; The third sealing ring 107 is disposed between the alcohol delivery pump cavity 101 and the alcohol delivery pump cover 604 to prevent methanol from leaking out of the pump from the oil delivery pump side; The fourth sealing ring 108 is disposed between the overflow cavity 104 and the alcohol delivery pump cover 604 to prevent the methanol in the overflow cavity 104 from leaking out of the pump.

[0044] In one embodiment, the bidirectional skeleton oil seal, the first sealing ring 205, the second sealing ring 106, the third sealing ring 107, the fourth sealing ring 108 and the sealing ring on the pressure regulating valve 5 are all made of fluorosilicone rubber material that is resistant to methanol corrosion. Methanol-passing parts: the pump body 1, the drive shaft 3, the oil pump, and the pressure regulating valve 5 are all made of corrosion-resistant stainless steel materials.

[0045] During operation, methanol enters the feed pump through the methanol inlet interface 603, is pressurized by the rotor pair 605, and is transported to the engine through the methanol outlet interface 602. After the methanol passing through the flow channel is pressure-regulated by the pressure regulating valve 5, the excess methanol flows back to the methanol tank through the methanol return port.

[0046] At the same time, lubricating oil is injected into the mounting flange 2 through the sealing plug 206 to meet the lubrication requirements of the right side of the bidirectional skeleton oil seal and the left side of the unidirectional skeleton oil seal. In addition, with the help of the lubricating oil of the engine gearbox, the sliding bearing 203 is lubricated by splashing to several pressure balance holes 202 and oil grooves of the mounting flange 2.

[0047] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A feed pump for low-pressure methanol supply, characterized in that: include: The mounting body is provided with an alcohol inlet interface (603), an alcohol delivery pump chamber (101), a pressure regulating valve chamber (103), an alcohol outlet interface (602), an alcohol return interface (109), and a pressure regulating valve chamber (103); the alcohol delivery pump chamber (101) is respectively connected to the alcohol inlet interface (603) and the alcohol outlet interface (602); and the pressure regulating valve chamber (103) is connected to the alcohol outlet interface (602); An alcohol delivery pump (6) comprising a drive shaft (3) rotatably connected to the mounting body and a rotor pair (605) connected to the drive shaft (3) and disposed in the alcohol delivery pump cavity (101); Wherein, after methanol enters the alcohol delivery pump chamber (101) through the alcohol inlet interface (603), it flows through the rotor pair (605). After the methanol is pressurized by the rotor pair (605), it is delivered to the alcohol outlet interface (602). At the same time, the pressure regulating valve chamber (103) can adjust the delivery pressure of the methanol and flow out through the alcohol return interface (109).

2. A feed pump for low-pressure methanol supply according to claim 1, characterized in that: The mounting body comprises a pump body (1) and an alcohol delivery pump cover (604) connected to the pump body (1); The alcohol inlet interface (603) and the alcohol outlet interface (602) are respectively arranged on the alcohol delivery pump cover (604), and the alcohol delivery pump chamber (101) and the alcohol outlet interface (602) are arranged on the pump body (1); The pump body (1) is further provided with an overflow chamber (104) in communication with the pressure regulating valve chamber (103), and the alcohol delivery pump cover (604) is further provided with an internal oil passage (601) in communication with the alcohol outlet interface (602) and the overflow chamber (104), respectively.

3. A feed pump for low-pressure methanol supply according to claim 2, characterized in that: A flange cavity (102) is provided on one end of the pump body (1) away from the alcohol delivery pump cover (604), and the mounting body further comprises a mounting flange (2) mounted on the pump body (1) through the flange cavity (102); It also includes a first skeleton oil seal (201) and a second skeleton oil seal (105), a lubricating oil passage is formed between the mounting flange (2) and the pump body (1), the first skeleton oil seal (201) and the second skeleton oil seal (105) are arranged opposite to each other and are respectively arranged in the inner holes of the mounting flange (2) and the pump body (1), and the second skeleton oil seal (105) is located on one side of the rotor pair (605); Wherein, the lubricating oil can flow through the first skeleton oil seal (201) and the second skeleton oil seal (105) via the lubricating oil channel.

4. A feed pump for low-pressure methanol supply according to claim 3, characterized in that: The first skeleton oil seal (201) is a one-way skeleton oil seal; the second skeleton oil seal (105) is a two-way skeleton oil seal.

5. A feed pump for low-pressure methanol supply according to claim 3, characterized in that: A sliding bearing (203) is provided in the inner hole of the mounting flange (2), which is sleeved on the drive shaft (3) and located beside the first skeleton oil seal (201); The mounting flange (2) is provided with at least one pressure balancing hole (202) extending from the axial outer end of the mounting flange (2) to the sliding bearing (203); A drive shaft thrust surface (204) is provided at an axial outer end of the drive shaft (3) close to the mounting flange (2) or at an end of the mounting flange (2) close to the drive shaft (3); A gap is formed between the inner hole of the sliding bearing (203) and the drive shaft (3); the drive shaft thrust surface (204) comprises an oil groove and a limiting plane, and the limiting plane can be used for axial limiting of the drive shaft (3); The splashed lubricating oil can enter the gap through the oil groove and / or enter the sliding bearing (203) through the pressure balance hole (202) to lubricate the sliding bearing (203).

6. A feed pump for low-pressure methanol supply according to claim 3, characterized in that: It also includes a retaining ring (10) sleeved on the drive shaft (3), the retaining ring (10) being close to one side of the axial inner end of the mounting flange (2) to limit axial movement of the drive shaft (3).

7. A feed pump for low-pressure methanol supply according to claim 3, characterized in that: Two sealing plugs (206) are respectively provided at the radial ends of the mounting flange (2), which are respectively used for filling and draining the lubricating oil channel.

8. A feed pump for low-pressure methanol supply according to claim 1, characterized in that: A pressure regulating valve (5) is arranged in the pressure regulating valve chamber (103).

9. A feed pump for low-pressure methanol supply according to claim 8, characterized in that: The pressure regulating valve chamber (103) is provided with a sealing plane and a radial sealing ring groove which are sealed with the pressure regulating valve (5).

10. A feed pump for low-pressure methanol supply according to claim 3, characterized in that: Also includes at least one of the following features: A first sealing ring (205) is arranged between the radial outer peripheral end of the outer side of the mounting flange (2) and the engine drive wheel; A second sealing ring (106) is arranged between the radial outer peripheral end of the inner side of the mounting flange (2) and the flange cavity (102); A third sealing ring (107) is disposed between the alcohol delivery pump chamber (101) and the alcohol delivery pump cover (604); A fourth sealing ring (108) is disposed between the overflow chamber (104) and the alcohol delivery pump cover (604).

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