Fuel supply system and method for dual-fuel diesel engine

Abstract

The invention discloses a dual-fuel diesel engine fuel supply system and method in the technical field of diesel engine accessories, the dual-fuel diesel engine fuel supply system comprises a cylinder body and two fuel supply units communicated with the cylinder body, and each fuel supply unit comprises a storage box, a delivery pump and a separation box which are communicated in sequence; a rotating shaft is arranged in the separation box, a filter screen used for dividing an inner cavity of the separation box into an upper cavity and a lower cavity is arranged on the rotating shaft, an impeller is arranged in a feeding port of the cavity on the upper side, a shaft of the impeller and the rotating shaft are in transmission through a first transmission assembly, and a blocking piece is arranged in the cavity on the upper side; when fuel enters the separation box, the impeller can be driven by the fuel to rotate, through transmission of the first transmission assembly, the rotating shaft and the filter screen continuously rotate, the contact area of the filter screen and the fuel is changed, impurities above the filter screen are blocked through the blocking piece, the impurities are prevented from being accumulated in the contact area of the fuel and the filter screen, and the fuel separation efficiency is improved. Therefore, the normal supply of fuel is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engine accessories, in particular to a dual-fuel diesel engine fuel supply system and method. Background Art

[0002] The fuel used by traditional engines is petrochemical fuel gasoline and diesel, but petroleum energy is increasingly scarce, environmental pollution is becoming more and more serious, and the development and application of clean alternative fuels for engines is imminent. The dual-fuel diesel engine fuel supply system came into being in this context. The system combines the advantages of two fuels (such as diesel and natural gas, diesel and methanol, etc.) to achieve the dual goals of efficient combustion and low emissions. For example, the public document of a methanol / diesel dual-fuel diesel engine fuel supply method with announcement number CN105114193B discloses such a dual-fuel supply device; however, the device has certain limitations during use, such as the need to filter and remove impurities before the fuel enters the cylinder combustion chamber. Because the filter area through which the fuel passes is fixed, impurities will accumulate in the filter area, reducing the efficiency of subsequent fuel passing through the filter area, affecting the fuel supply. Summary of the invention

[0003] The purpose of the present invention is to provide a dual-fuel diesel engine fuel supply system and method to solve the problem proposed in the above background technology that the filter area through which the fuel passes is fixed, resulting in impurities accumulating in the filter area, reducing the efficiency of subsequent fuel passing through the filter area and affecting the fuel supply.

[0004] To achieve the above object, the present invention provides the following technical solution: A dual-fuel diesel engine fuel supply system, comprising: a cylinder body and two fuel supply units connected to the cylinder body, wherein the fuel supply units comprise a storage tank, a delivery pump and a separation tank connected in sequence;

[0005] A rotating shaft is provided in the separation box, and a filter screen is provided on the rotating shaft for dividing the inner cavity of the separation box into two upper and lower cavities. The feed port of the upper cavity is connected with the discharge port of the conveying pump, and the discharge port of the lower cavity is connected with the feed port of the cylinder body. An impeller is provided in the feed port of the upper cavity, and the shaft of the impeller and the rotating shaft are transmitted by a first transmission assembly. A blocking member for intercepting impurities above the filter screen is provided in the upper cavity; the first transmission assembly is used to rotate synchronously with the rotating shaft when the impeller rotates, so that the filter screen rotates continuously and the impurities above the filter screen are gathered on one side of the blocking member.

[0006] Preferably, the blocking member includes a first baffle plate arranged at the top of the inner cavity of the upper cavity, and a conveying assembly and a scraper plate arranged at the bottom of the first baffle plate. The conveying assembly and the scraper plate are arranged in sequence along the rotation direction of the filter screen. A plurality of cleaning parts are provided on the side wall of the conveying assembly. A collecting box for collecting impurities is provided on the side wall of the storage box. A second baffle plate for fitting with the top wall of the filter screen is provided on the side of the first baffle plate away from the collecting box.

[0007] Preferably, a transmission shaft is provided on the conveying roller of the conveying assembly, and transmission is transmitted between the transmission shaft and the rotating shaft via a second transmission assembly.

[0008] Preferably, a gap is provided between the bottom of the conveying assembly and the top of the filter screen, the scraper is hinged on the bottom wall of the first baffle, and an elastic member is provided between the scraper and the first baffle.

[0009] Preferably, the scraper comprises a plurality of scraper blocks arranged in sequence along the length extension direction of the first baffle, and the plurality of scraper blocks are hinged to the bottom of the first baffle.

[0010] Preferably, the cleaning member includes a mounting block arranged on the side wall of the conveying assembly, a rotating block rotatably arranged on the mounting block, and a cleaning block arranged at the bottom of the rotating block, an elastic element is arranged between the mounting block and the rotating block, a mounting strip extending along the length direction of the first baffle is arranged at the bottom of the first baffle, the mounting strip is located between the conveying assembly and the scraper, a guide groove extending along the length direction of the mounting strip is arranged at the bottom of the mounting strip, a guide block for being inserted into the guide groove is arranged on the rotating block, a rack is arranged on the side wall of the guide groove, the cross-section of the guide block is circular, and teeth for engaging with the rack are arranged on the circumferential side wall of the guide block.

[0011] Preferably, the mounting block is slidably disposed on the side wall of the conveying assembly, a return spring is provided between the mounting block and the conveying assembly, the guide groove is inclined, and a side of the guide groove close to the second baffle is lower than a side of the guide groove away from the second baffle.

[0012] Preferably, a dual-fuel diesel engine fuel supply method, using the above-mentioned dual-fuel diesel engine fuel supply system, comprises the following steps:

[0013] S1: The delivery pump works to input the fuel in the storage tank into the separation box and pass through the filter screen. The filter screen filters and removes the slag from the fuel. When the fuel enters the separation box, the impeller is driven to rotate by the fuel passing through the impeller. The impeller is driven by the first transmission component to rotate the rotating shaft with the filter screen, and the impurities intercepted above the filter screen are gathered on one side of the blocking member.

[0014] S2: After being filtered, the fuel is discharged from the separator box and enters the combustion chamber of the cylinder.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: in the present application, when the fuel enters the separation box, the impeller will be driven to rotate by the fuel, and the transmission is transmitted through the first transmission component, so that the rotating shaft and the filter screen continue to rotate, thereby changing the contact area between the filter screen and the fuel, and using a blocking member to block impurities above the filter screen to prevent impurities from accumulating in the contact area between the fuel and the filter screen, thereby ensuring the normal supply of fuel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of a dual-fuel diesel engine fuel supply system of the present invention;

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of the connection between the separation box and the filter screen of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure of the blocking member of the present invention;

[0019] Figure 4 For the present invention Figure 2 A magnified schematic diagram of the structure at B in the middle;

[0020] Figure 5 This is a schematic diagram of the connection structure between the first baffle and the conveying assembly of the present invention;

[0021] Figure 6 For the present invention Figure 5 A magnified schematic diagram of the structure at C in the middle;

[0022] Figure 7 It is a schematic diagram of the scraper structure of the present invention.

[0023] In the figure: 1, cylinder body; 2, fuel supply unit; 21, storage tank; 22, delivery pump; 23, separation box; 231, filter screen; 232, rotating shaft; 233, impeller; 234, first transmission assembly; 235, blocking member; 2351, first baffle; 2352, second baffle; 2353, delivery assembly; 2354, cleaning member; 23541, mounting block; 23542, rotating block; 23543, cleaning block; 23544, guide block; 2355, scraper; 23551, scraper block; 2356, mounting strip; 2357, guide groove; 2358, rack; 236, collection box; 237, transmission shaft; 238, second transmission assembly. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] See also Figure 1 The dual-fuel diesel engine fuel supply system comprises: a cylinder body 1 and two fuel supply units 2; the fuel supply unit 2 comprises a storage tank 21, a delivery pump 22, and a separation box 23; the feed port of the delivery pump 22 is connected with the storage tank 21 through a pipeline, and the discharge port of the delivery pump 22 is connected with the feed port of the separation box 23 through a pipeline; the storage tank 21, the delivery pump 22, and the separation box 23 are arranged in sequence from bottom to top, and the height of the separation box 23 is higher than the height of the cylinder body 1; the bottom of the inner cavity of the separation box 23 is connected with the injector installed on the cylinder body 1; and two different fuels (such as methanol and diesel) are filled in the two storage tanks 21.

[0027] See also Figure 2 A rotating shaft 232 is rotatably provided at the top of the inner cavity of the separation box 23, and a filter screen 231 is fixedly sleeved on the outer wall of the rotating shaft 232. The filter screen 231 divides the inner cavity of the separation box 23 into two upper and lower cavities. The feed port at the top of the upper cavity is connected to the discharge port of the delivery pump 22 through a pipeline, and the discharge port of the lower cavity is connected to the feed port of the cylinder body 1 (that is, the discharge port of the lower cavity is connected to the injector of the cylinder body 1 through a pipeline); an impeller is provided in the inner cavity of the feed port of the upper cavity 233, the shaft of the impeller 233 and the rotating shaft 232 are driven by a first transmission assembly 234 (the first transmission assembly 234 includes two guide wheels and a transmission belt, the two guide wheels are respectively fixedly mounted on the shaft of the impeller 233 and the rotating shaft 232, and the two guide wheels are driven by the transmission belt), and a blocking member 235 is provided at the top of the inner cavity of the upper cavity; the feed port of the upper cavity is located on one side of the rotating shaft 232, and the blocking member 235 is located on the other side of the rotating shaft 232 (according to Figure 2 As shown, the feed port of the upper cavity is located on the right side of the rotating shaft 232, and the blocking member 235 is located on the left side of the rotating shaft 232).

[0028] The fuel supply method of a dual-fuel diesel engine comprises the following specific steps:

[0029] First, the delivery pump 22 works to input the fuel in the storage tank 21 into the separation box 23, and the fuel passes through the filter 231 from above, and the filter 231 filters and removes the residue from the fuel; when the fuel enters the separation box 23, the impeller 233 is driven to rotate when the fuel passes through the impeller 233, and the first transmission assembly 234 is driven to continuously rotate the shaft 232 and the filter 231, and the impurities intercepted above the filter 231 are gathered on one side of the blocking member 235, so as to prevent the impurities from accumulating in the contact area between the fuel and the filter 231;

[0030] Second, the fuel is filtered and discharged from the separation box 23 and enters the combustion chamber of the cylinder 1.

[0031] It should be noted that if the fuel entering the cylinder 1 needs to be pressurized, a pressure regulator is installed at the feed port of the cylinder 1 to adjust the pressure of the fuel discharged by the separation box 23 .

[0032] In this embodiment, as a further optimized solution, please refer to Figure 3 , Figure 4 and Figure 5 The blocking member 235 includes a first baffle 2351, a second baffle 2352, a conveying assembly 2353 (the conveying assembly 2353 includes two conveying rollers and a conveyor belt sleeved between the two conveying rollers, and the conveying roller is vertically installed at the bottom of the first baffle 2351), and a scraper 2355. The first baffle 2351 is arranged at the top of the inner cavity of the upper cavity, and the conveying assembly 2353 and the scraper 2355 are both arranged on the bottom wall of the first baffle 2351. The conveying assembly 2353 and the scraper 2355 are arranged in sequence along the rotation direction of the filter screen 231. A plurality of cleaning members 2354 are arranged on the side wall of the conveying assembly 2353 (a plurality of cleaning members 2354 are installed on the side wall of the conveyor belt ), a collecting box 236 is provided on the side wall of the storage box 21, and an opening is opened on the side wall of the storage box 21, through which the inner cavity of the upper cavity is connected with the inner cavity of the collecting box 236, and a second baffle 2352 is provided on the side of the first baffle 2351 away from the collecting box 236, and the bottom wall of the second baffle 2352 is in contact with the top wall of the filter screen 231; a conveying roller of the conveying assembly 2353 is provided with a transmission shaft 237, and the transmission shaft 237 is rotatably installed on the top of the inner cavity of the upper cavity, and the transmission shaft 237 and the rotating shaft 232 are transmitted through the second transmission assembly 238 (the structure of the second transmission assembly 238 is the same as that of the first transmission assembly 234, and the function is also the same).

[0033] It should be noted that according to Figure 3 In the direction shown, the filter 231 rotates along the needle direction, so that the impurities stay on the front side of the blocking member 235, and the scraper 2355 is used to intercept the impurities above the filter 231; during the rotation of the rotating shaft 232, the second transmission assembly 238 is used to drive the transmission shaft 237 to rotate, and the conveyor roller rotates, so that the conveyor belt drive moves with several cleaning members 2354, and the intercepted impurities are swept into the inner cavity of the collection box 236, so that the impurities will not accumulate above the filter 231, reducing the probability of clogging of the filter 231.

[0034] In this embodiment, as a further optimized solution, please refer to Figure 5The bottom of the conveying component 2353 does not contact the top of the filter 231 to avoid wear of the conveying component 2353. The scraper 2355 is hinged on the bottom wall of the first baffle 2351 (the scraper 2355 can rotate along the moving direction of the filter 231 at the bottom of the first baffle 2351), and an elastic member (spring) is provided between the scraper 2355 and the first baffle 2351; when some impurities are stuck in the filter holes of the filter 231 and cannot be discharged, the scraper 2355 will be pushed to rotate, so that the area on the filter 231 where the impurities are stuck can pass through the scraper 2355 to avoid blocking the rotation of the filter 231.

[0035] In this embodiment, as a further optimized solution, please refer to Figure 7 The scraper 2355 includes a plurality of scraper blocks 23551, which are arranged in sequence along the length extension direction of the first baffle 2351, and the plurality of scraper blocks 23551 are hinged at the bottom of the first baffle 2351 (an elastic member is installed between each scraper block 23551 and the first baffle 2351); when one scraper block 23551 rotates, it will not bring other scraper blocks 23551 with it, and when one or part of the scraper blocks 23551 are pushed to move by impurities, the other scraper blocks 23551 will not reduce the blocking effect of the scraper blocks 23551 on the impurities.

[0036] In this embodiment, as a further optimized solution, please refer to Figure 5 and Figure 6 The cleaning member 2354 includes a mounting block 23541, a rotating block 23542, a cleaning block 23543, and a guide block 23544. The mounting block 23541 is arranged on the side wall of the conveyor belt of the conveying assembly 2353. The rotating block 23542 is rotatably arranged on the mounting block 23541. The cleaning block 23543 is arranged on the bottom wall of the rotating block 23542 (the cleaning block 23543 can be a sponge or a brush). An elastic element (such as a torsion spring) is arranged between the mounting block 23541 and the rotating block 23542. The guide block 23544 is arranged above the rotating block 23542. A mounting strip 2356 is arranged at the bottom of the first baffle 2351. The mounting strip 2356 is arranged along the bottom of the first baffle 2351. The first baffle 2351 extends in the length direction, the mounting strip 2356 is located between the conveying assembly 2353 and the scraper 2355, a guide groove 2357 is provided at the bottom of the mounting strip 2356 (the end of the guide groove 2357 is open), the guide groove 2357 extends along the length direction of the mounting strip 2356, a rack 2358 is provided on the side wall of the guide groove 2357, the rack 2358 also extends along the length direction of the mounting strip 2356, the cross-section of the guide block 23544 is circular, and a plurality of teeth are provided on the circumferential side wall of the guide block 23544 (the plurality of teeth are arc-shaped, that is, the plurality of teeth will not occupy the entire circumferential side wall of the guide block 23544).

[0037] It should be noted that, during the transmission of the conveying assembly 2353, when the cleaning member 2354 moves to the same side as the mounting strip 2356, the guide block 23544 on the cleaning member 2354 at that position will be inserted into the inner cavity of the guide groove 2357, and as the cleaning member 2354 continues to move, the guide block 23544 will move in the inner cavity of the guide groove 2357, so that the teeth on the guide block 23544 contact the rack 2358, driving the guide block 23544 to rotate with the rotating block 23542, so as to move the cleaning block 2354 3 is rotated to change the force direction of the bottom end of the cleaning block 23543 in contact with the top of the filter screen 231, so as to avoid the bottom end of the cleaning block 23543 being bent due to a force in one direction for a long time, and to reduce the bending amplitude of the cleaning block 23543, so that the cleaning block 23543 can contact with the top of the filter screen 231, thereby ensuring its cleaning effect; after the guide block 23544 is moved out of the inner cavity of the guide groove 2357, the guide block 23544 is rotated and reset with the rotating block 23542 and the cleaning block 23543 through the action of the elastic element.

[0038] In this embodiment, as a further optimized solution, please refer to Figure 6 , the mounting block 23541 is slidably arranged on the side wall of the conveying assembly 2353 (a slide groove is arranged on the side wall of the conveyor belt, the slide groove is arranged vertically, and a slider is arranged on the mounting block 23541, and the slider is slidably arranged in the inner cavity of the slide groove, so that the mounting block 23541 can move up and down), a reset spring is arranged between the mounting block 23541 and the conveying assembly 2353, and the guide groove 2357 is inclined. The side of the guide groove 2357 close to the second baffle plate 2352 is lower than the side of the guide groove 2357 away from the second baffle plate 2352; when the guide block 23544 moves inside the guide groove 2357, the guide block 23544 will gradually move downward with the rotating block 23542, so that the bottom end of the cleaning block 23543 can contact the filter screen 231 (because the cleaning block 23543 with a bent bottom end will not fully contact the top of the filter screen 231), to ensure that the bent cleaning block 23543 can be reset.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Dual-fuel diesel engine fuel supply system, including: A cylinder (1) and two fuel supply units (2) connected to the cylinder (1), characterized in that the fuel supply unit (2) comprises a storage tank (21), a delivery pump (22) and a separation tank (23) connected in sequence; A rotating shaft (232) is provided in the separation box (23), and a filter screen (231) is provided on the rotating shaft (232) for dividing the inner cavity of the separation box (23) into two upper and lower cavities. The feed port of the upper cavity is communicated with the discharge port of the delivery pump (22), and the discharge port of the lower cavity is communicated with the feed port of the cylinder body (1). An impeller (233) is provided in the feed port of the upper cavity. The shaft of the impeller (233) and the rotating shaft (232) are driven by a first transmission component (234). A blocking member (235) for intercepting impurities above the filter screen (231) is provided in the upper cavity. The first transmission component (234) is used to rotate synchronously with the rotating shaft (232) when the impeller (233) rotates, so that the filter screen (231) rotates continuously, and the impurities above the filter screen (231) are gathered on one side of the blocking member (235).

2. The dual-fuel diesel engine fuel supply system according to claim 1, characterized in that: The blocking member (235) comprises a first baffle (2351) arranged at the top of the inner cavity of the upper cavity, and a conveying assembly (2353) and a scraper (2355) arranged at the bottom of the first baffle (2351); the conveying assembly (2353) and the scraper (2355) are arranged in sequence along the rotation direction of the filter (231); a plurality of cleaning members (2354) are arranged on the side wall of the conveying assembly (2353); a collecting box (236) for storing impurities is arranged on the side wall of the storage box (21); and a second baffle (2352) for fitting with the top wall of the filter (231) is arranged on the side of the first baffle (2351) away from the collecting box (236).

3. The dual-fuel diesel engine fuel supply system according to claim 2, characterized in that: A transmission shaft (237) is provided on the conveying roller of the conveying assembly (2353), and transmission is transmitted between the transmission shaft (237) and the rotating shaft (232) via a second transmission assembly (238).

4. The dual-fuel diesel engine fuel supply system according to claim 2, characterized in that: A gap is provided between the bottom of the conveying assembly (2353) and the top of the filter screen (231); the scraper (2355) is hinged on the bottom wall of the first baffle (2351); and an elastic member is provided between the scraper (2355) and the first baffle (2351).

5. The dual-fuel diesel engine fuel supply system according to claim 4, characterized in that: The scraper (2355) comprises a plurality of scraper blocks (23551) arranged in sequence along the length extension direction of the first baffle (2351), and the plurality of scraper blocks (23551) are hinged to the bottom of the first baffle (2351).

6. The dual-fuel diesel engine fuel supply system according to claim 2, characterized in that: The cleaning member (2354) comprises a mounting block (23541) arranged on the side wall of the conveying assembly (2353), a rotating block (23542) rotatably arranged on the mounting block (23541), and a cleaning block (23543) arranged at the bottom of the rotating block (23542); an elastic element is arranged between the mounting block (23541) and the rotating block (23542); a mounting strip (2356) extending along the length direction of the first baffle (2351) is arranged at the bottom of the first baffle (2351); the mounting strip (2356) is located at the conveying assembly (2353); The bottom of the mounting strip (2356) is provided with a guide groove (2357) extending along the length direction of the mounting strip (2356), the rotating block (23542) is provided with a guide block (23544) for being inserted into the guide groove (2357), the side wall of the guide groove (2357) is provided with a rack (2358), the cross section of the guide block (23544) is circular, and the circumferential side wall of the guide block (23544) is provided with teeth for engaging with the rack (2358).

7. The dual-fuel diesel engine fuel supply system according to claim 6, characterized in that: The mounting block (23541) is slidably arranged on the side wall of the conveying assembly (2353), a return spring is arranged between the mounting block (23541) and the conveying assembly (2353), the guide groove (2357) is inclined, and the side of the guide groove (2357) close to the second baffle (2352) is lower than the side of the guide groove (2357) away from the second baffle (2352).

8. A dual-fuel diesel engine fuel supply method, using the dual-fuel diesel engine fuel supply system according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: The delivery pump (22) works to input the fuel in the storage tank (21) into the separation tank (23), and the fuel passes through the filter screen (231). The filter screen (231) filters and removes the slag from the fuel. When the fuel enters the separation tank (23), the impeller (233) is driven to rotate by the fuel passing through the impeller. The impeller (233) is driven by the first transmission component (234), so that the rotating shaft (232) rotates with the filter screen (231), and the impurities intercepted above the filter screen (231) are gathered on one side of the blocking member (235); S2: After being filtered, the fuel is discharged from the inside of the separation box (23) and enters the combustion chamber of the cylinder (1).

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