Fuel injection device of efficient diesel generating set

Abstract

The utility model relates to the technical field of generator sets, in particular to a fuel injection device of an efficient diesel generator set, an annular limiting ring is arranged in the middle of the inner side wall of a sliding lock sleeve, and a magnetic ring is arranged on the sliding lock sleeve on the side, close to an external connecting pipe, of the limiting ring; when the magnetic ring moves to the position corresponding to the limiting hole, the magnetic ring can magnetically attract the ball, so that the part, protruding out of the inner side wall of the tee joint body, of the ball is reduced. A magnetic ring is arranged on the sliding lock sleeve, so that when a limiting ring and a limiting hole are staggered by compressing a reset spring, the magnetic ring can magnetically attract a ball, the ball can overcome the gravity effect to move, and then the part, protruding out of the inner side wall of the first end of the tee joint body, of the ball can automatically move into the limiting hole; the situation that the ball still protrudes out of the inner side wall of the first end of the tee joint body due to the gravity effect can be well avoided, and the situation that the oil inlet pipe and the tee joint body are inconvenient to disassemble and assemble due to the fact that the ball and the annular clamping groove still form limiting is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of generator sets, in particular to a high-efficiency fuel injection device for a diesel generator set. Background Art

[0002] Diesel generators are also called diesel engines. In the existing technology, most cars are designed with an oil return system. The fuel pump supplies fuel to the engine through the oil pipe, forming a certain pressure. In addition to the normal supply to the fuel nozzle for injection, the remaining fuel is sent back to the fuel tank through the return line. The return line and the fuel pump oil pipe need to be connected through a three-way pipe joint. The existing three-way pipe joint is generally a T-shaped three-way structure, with one side joint connected to the oil pipe, the other side joint connected to the filter, and the remaining side joint connected to the return line. However, the plastic three-way pipe joint in the existing technology is connected to the oil pipe and the return line through a threaded port. When replacement is needed, it will cause difficulty in disassembly and affect work efficiency.

[0003] To solve the above problems, Chinese utility model patent CN221957713U discloses a fuel injection device for an extended-range engine. When disassembling, the locking sleeve is slid to squeeze the first spring. The locking sleeve is separated from the spherical hole when sliding, so that the ball can be moved. At this time, the oil inlet pipe, oil outlet pipe and oil return pipe can be pulled out. The disassembly is simple and convenient. When installing, the locking sleeve is also slid first to separate it from the spherical hole, and then the oil inlet pipe, oil outlet pipe and oil return pipe are inserted into the interface pipe so that the annular grooves on the oil inlet pipe, oil outlet pipe and oil return pipe are engaged with the ball. At this time, the locking sleeve is released, and the locking sleeve limits the spherical hole, so that the ball cannot move. The installation is completed, and the operation is simple and fast.

[0004] However, the above solution has the following problem: the ball rollers arranged in the spherical hole will always have a tendency to fall under the action of gravity, so that when the sliding locking sleeve separates it from the spherical hole, although the ball rollers are no longer limited by the locking sleeve, the ball rollers will still be at the lower end of their vertical movable range due to the action of gravity, so that some of the ball rollers at a higher position will still block the oil inlet pipe, the oil outlet pipe or the oil return pipe. In particular, when the oil inlet pipe, the oil outlet pipe or the oil return pipe needs to be removed from the three-way pipe joint, even if the sliding locking sleeve is separated from the spherical hole, the side walls of the annular groove will still block some of the ball rollers at a higher position, making it impossible to remove them smoothly. Utility Model Content

[0005] In view of the above problems existing in the prior art, the utility model provides a high-efficiency fuel injection device for a diesel generator set.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0007] A high-efficiency fuel injection device for a diesel generator set comprises a tee body and a sliding lock sleeve sleeved on one end portion of the tee body; a limiting hole is provided on the circumferential side wall of the tee body, and a ball is provided in the limiting hole; an annular limiting ring is provided in the middle position of the inner side wall of the sliding lock sleeve, and a magnetic ring is provided on the sliding lock sleeve on the side of the limiting ring close to the external connecting pipe; when the magnetic ring moves to a position corresponding to the limiting hole, the magnetic ring can magnetically attract the ball to reduce the portion of the ball protruding from the inner side wall of the tee body.

[0008] Furthermore, a limiting groove is provided in the middle of the limiting hole, and a limiting plate that can extend into the limiting groove is provided on the ball. The ball can move in the axial direction of the limiting hole through the movement of the limiting plate in the limiting groove.

[0009] Furthermore, a first channel is provided on the end portion of the external connecting pipe connected to the tee body, the first channel extends along the axial direction of the external connecting pipe, and the first channel is communicated with the annular groove;

[0010] After the magnetic ring magnetically attracts the ball, the portion of the ball protruding from the inner side wall of the tee body can extend into the first channel.

[0011] Furthermore, when the limiting ring moves to a position corresponding to the limiting hole by squeezing the ball, the portion of the ball protruding from the inner side wall of the tee body is hemispherical or larger than a hemispherical shape;

[0012] When the magnetic ring moves to a position corresponding to the limiting hole, the portion of the ball protruding from the inner side wall of the tee body is smaller than a hemisphere.

[0013] Furthermore, an elastic baffle is provided at the connection point between the first lane and the annular groove.

[0014] Furthermore, a first identification body is provided on the tee body, and a second identification body is provided on the external connecting pipe;

[0015] When the three-way body and the external connecting pipe are aligned through the first identification body and the second identification body, the ball can extend into the first channel.

[0016] The utility model has at least the following beneficial effects:

[0017] The present application arranges a magnetic ring on the sliding lock sleeve so that when the limit ring is misaligned with the limit hole through the compression return spring, the magnetic ring can magnetically attract the ball, so that the ball can overcome the effect of gravity and move, and then the part of the ball protruding from the inner side wall of the first end of the tee body can automatically move into the limit hole, which can better prevent the ball from still protruding from the inner side wall of the first end of the tee body due to gravity, and prevent the ball from still forming a limit with the annular groove, causing inconvenience in disassembly and assembly between the oil inlet pipe and the tee body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram showing the first end of the oil inlet pipe and the tee body in some embodiments of the present application is shown;

[0019] Figure 2 Shown Figure 1 A partial enlarged view of point A in the middle;

[0020] Figure 3 A schematic diagram showing the first end of the sliding lock sleeve and the tee body in some embodiments of the present application is shown;

[0021] Figure 4 Shows a schematic diagram of a sliding lock sleeve in some embodiments of the present application;

[0022] Figure 5 A cross-sectional view of a first end portion of a sliding lock sleeve and a tee body in some embodiments of the present application is shown;

[0023] Figure 6 Shown Figure 5 A partial enlarged view of point B in the middle.

[0024] Description of reference numerals:

[0025] 100, tee body; 110, first retaining ring; 111, first identification body; 120, second retaining ring; 130, limiting hole; 131, limiting groove; 200, oil inlet pipe; 210, annular groove; 220, first row; 221, elastic baffle; 230, second identification body; 300, ball bearing; 310, limiting plate; 400, sliding locking sleeve; 410, limiting ring; 420, return spring; 430, magnetic ring. DETAILED DESCRIPTION

[0026] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments. It should be understood that the embodiments are merely for explanation of the present invention and are not intended to limit the present invention.

[0027] like Figure 1-6As shown, this embodiment provides a high-efficiency fuel injection device for a diesel generator set, which includes a three-way pipe joint, namely a three-way body 100; and external connecting pipes. The external connecting pipes specifically include an oil inlet pipe 200, an oil outlet pipe, and an oil return pipe that can be connected to the three-way body 100. In this embodiment, the oil inlet pipe 200 is used as an example. An annular groove 210 is provided on the circumferential outer wall of the end portion where the oil inlet pipe 200 connects to the three-way body 100. A first annular retaining ring 110 and a second annular retaining ring 120 are provided on the circumferential side wall of the first end of the tee body 100 connected to the oil inlet pipe 200, and a limiting hole 130 is provided between the first retaining ring 110 and the second retaining ring 120. The limiting holes 130 are arranged in a plurality along the circumferential direction of the first end of the tee body 100, and a ball 300 is provided in the limiting hole 130; an annular sliding lock sleeve 400 is also sleeved on the first end of the tee body 100, and an annular limiting ring 410 is provided at the middle position of the inner side wall of the sliding lock sleeve 400. When the sliding lock sleeve 400 is sleeved on the first end of the tee body 100, the limiting ring 410 is located between the first retaining ring 110 and the second retaining ring 120, so that the sliding lock sleeve 400 can be moved in the axial direction of the first end of the tee body 100 by moving the limiting ring 410 between the first retaining ring 110 and the second retaining ring 120.

[0028] Furthermore, the first retaining ring 110 is closer to the first end of the tee body 100 than the second retaining ring 120. A return spring 420 is provided between the retaining ring 410 and the second retaining ring 120. The return spring 420 can maintain the pressure on the retaining ring 410, so that the retaining ring 410 has a tendency to drive the sliding lock sleeve 400 toward the end closer to the first end of the tee body 100.

[0029] It should be noted from the above that, when no external force is applied to the sliding lock sleeve 400, the limit ring 410 moves under the thrust of the return spring 420 to counteract the first retaining ring 110. During this process, the limit ring 410 will squeeze the ball 300, so that the ball 300 moves into the limit hole 130. When the limit ring 410 counteracts the first retaining ring 110, the position of the limit ring 410 is opposite to the position of the limit hole 130, so that the limit ring 410 can block the limit hole 130, so that the ball 300 cannot protrude from the circumferential side wall of the tee body 100. When the staff applies a force to the sliding locking sleeve 400, the sliding locking sleeve 400 squeezes the return spring 420 through the limit ring 410, so that the limit ring 410 can move toward the second retaining ring 120 through the compression of the return spring 420, thereby making the position of the limit ring 410 misaligned with the position of the limit hole 130, thereby making the ball 300 in the limit hole 130 able to move radially in the first end of the tee body 100, so that the ball 300 protrudes from the outer wall of the first end of the tee body 100. When the staff cancels the force applied to the sliding locking sleeve 400, the return spring 420 drives the limit ring 410 to move toward the first retaining ring 110, and the limit ring 410 presses the ball 300 into the limit hole 130 again. Furthermore, when the position of the limiting ring 410 is misaligned with the position of the limiting hole 130, the limiting ring 410 no longer limits the ball 300, and the ball 300 can move to protrude from the outer wall of the first end of the tee body 100, and the part of the ball 300 protruding from the inner wall of the first end of the tee body 100 can move into the limiting hole 130, thereby allowing the oil inlet pipe 200 to extend into the first end of the tee body 100. At this time, the staff no longer applies force to the sliding locking sleeve 400, and when the annular groove 210 on the oil inlet pipe 200 moves to a position facing the limiting hole 130, the ball 300 in the limiting hole 130 can partially protrude from the inner wall of the first end of the tee body 100 under the pressure of the limiting ring 410, so that the limiting ring 410 can move to a position facing the limiting hole 130 to achieve alignment. The ball 300 is limited, and part of the ball 300 extends into the annular groove 210, so that the ball 300 can form a limiting effect with the annular groove 210, so that the oil inlet pipe 200 can be clamped and fixed in the first end of the tee body 100, thereby realizing the connection between the oil inlet pipe 200 and the tee body 100; when it is necessary to disassemble the oil inlet pipe 200 and the tee body 100, the staff applies a force to the sliding lock sleeve 400, so that the limiting ring 410 moves by squeezing the return spring 420 so that the limiting hole 130 is no longer blocked, so that the part of the ball 300 protruding from the inner side wall of the first end of the tee body 100 can move into the limiting hole 130, so that the ball 300 no longer forms a limit with the annular groove 210, thereby realizing the removal of the oil inlet pipe 200 from the first end of the tee body 100.

[0030] Furthermore, an annular magnetic ring 430 is provided on the sliding lock sleeve 400 on the side of the limiting ring 410 near the oil inlet pipe 200. The ball 300 is made of a metal material, such as iron, that can be magnetically attracted to the magnetic ring 430. The iron magnetic ring 430 is fixed to the inner wall of the sliding lock sleeve 400 by means of threads, bolts, clamping, or bonding. When the staff applies a force to the sliding locking sleeve 400 so that the sliding locking sleeve 400 drives the limiting ring 410 to move closer to the second retaining ring 120, the position of the limiting ring 410 is misaligned with the position of the limiting hole 130, and the ball 300 can be magnetically attracted by the magnetic ring 430, so that the ball 300 can automatically move toward the axis away from the first end of the tee body 100, so that the part of the ball 300 protruding from the inner side wall of the first end of the tee body 100 can automatically move into the limiting hole 130, thereby facilitating the oil inlet pipe 200 to extend into the first end of the tee body 100 and move out from the first end of the tee body 100, thereby facilitating the rapid disassembly and assembly between the oil inlet pipe 200 and the tee body 100.

[0031] It is worth mentioning that by arranging the magnetic ring 430 on the sliding lock sleeve 400, when the limiting ring 410 is misaligned with the limiting hole 130 through the compression of the return spring 420, the magnetic ring 430 can magnetically attract the ball 300, so that the ball 300 can overcome the action of gravity and move, thereby making the part of the ball 300 protruding from the inner side wall of the first end of the tee body 100 automatically move into the limiting hole 130, which can better prevent the ball 300 from still protruding from the inner side wall of the first end of the tee body 100 due to the action of gravity, and prevent the ball 300 from still forming a limit with the annular groove 210, causing inconvenience in disassembly and assembly between the oil inlet pipe 200 and the tee body 100.

[0032] In some embodiments, a limiting groove 131 is provided in the middle position of the limiting hole 130, and a limiting plate 310 is provided on the ball 300, which can extend into the limiting groove 131. Through the setting of the limiting plate 310 and the limiting groove 131, the stability of the ball 300 installed in the limiting hole 130 can be better improved.

[0033] Furthermore, the limiting groove 131 extends in the radial direction of the first end of the tee body 100, so that the limiting plate 310 has the freedom to move in the radial direction of the first end of the tee body 100 in the limiting groove 131, and thus the movement of the ball 300 in the limiting hole 130 can be realized by the movement of the limiting plate 310 in the limiting groove 131. When the magnetic ring 430 magnetically attracts the ball 300, the limit plate 310 moves in the limit groove 131 toward the direction of the axis away from the first end of the tee body 100, thereby causing the ball 300 to move toward the direction of the axis away from the first end of the tee body 100, thereby causing the part of the ball 300 protruding from the inner side wall of the first end of the tee body 100 to move into the limit hole 130; when the limit ring 410 moves toward the first retaining ring 110 under the push of the return spring 420, the limit ring 410 can squeeze the part of the outer side wall of the ball 300 protruding from the first end of the tee body 100, so that the ball 300 moves in the limit groove 131 toward the direction of the axis close to the first end of the tee body 100, thereby causing part of the ball 300 to protrude from the inner side wall of the first end of the tee body 100.

[0034] In some embodiments, a first row 220 is provided at the end portion where the oil inlet pipe 200 is connected to the tee body 100. The first row 220 extends along the axial direction of the oil inlet pipe 200 and is connected to the annular groove 210. A plurality of first rows 220 are provided in the circumferential direction of the oil inlet pipe 200. Specifically, the number of first rows 220 corresponds to the number of balls 300 on the first end of the tee body 100.

[0035] It is understandable that since the movement of the ball 300 in the limiting hole 130 is affected by gravity and friction, even if the movement of the ball 300 in the limiting hole 130 is achieved by the magnetic attraction of the magnetic ring 430 to the ball 300, there may be a situation where the ball 300 does not move smoothly. By setting the first row 220, the part of the inner wall of the ball 300 protruding from the first end of the tee body 100 can extend into the first row 220, thereby better realizing the movement of the oil inlet pipe 200 in the first end of the tee body 100, thereby facilitating the disassembly and assembly between the oil inlet pipe 200 and the tee body 100.

[0036] In some embodiments, when the limiting ring 410 moves to a position corresponding to the limiting hole 130, the limiting ring 410 blocks the limiting hole 130, so that the portion of the ball 300 protruding from the outer wall of the first end of the tee body 100 moves into the limiting hole 130. At this time, the portion of the ball 300 protruding from the inner wall of the first end of the tee body 100 is hemispherical or larger than a hemisphere; when the limiting ring 410 compresses the reset spring 420 to cause the magnetic ring 430 to magnetically attract the ball 300, the portion of the ball 300 protruding from the inner wall of the first end of the tee body 100 is smaller than a hemisphere, and the portion of the ball 300 protruding from the outer wall of the first end of the tee body 100 is less than or equal to a hemisphere.

[0037] It is understood that when the limiting ring 410 limits the ball 300, the portion of the ball 300 protruding from the inner sidewall of the first end of the tee body 100 is hemispherical or larger than hemispherical, allowing the ball 300 to protrude more from the inner sidewall of the first end of the tee body 100, thereby making the ball 300 more stable in limiting the oil inlet pipe 200. It is further understood from the above that, regardless of whether the position of the limiting ring 410 corresponds to the position of the limiting hole 130 or the position of the magnetic ring 430 corresponds to the position of the limiting hole 130, the ball 300 will partially protrude from the inner sidewall of the first end of the tee body 100, and when the position of the limiting ring 410 corresponds to the position of the limiting hole 130, the ball 300 protrudes more from the inner sidewall of the first end of the tee body 100.

[0038] It is worth mentioning that when the magnetic ring 430 magnetically attracts the ball 300, the limit plate 310 moves to the maximum position in the limit groove 131 along the radial direction of the first end of the tee body 100. At this time, the ball 300 will partially protrude from the inner side wall of the first end of the tee body 100. In this case, it is necessary to rotate the oil inlet pipe 200 or the tee body 100 so that the first row 220 on the oil inlet pipe 200 is aligned with the ball 300, and then the ball 300 enters the first row 220, thereby realizing the disassembly and assembly between the oil inlet pipe 200 and the tee body 100. When the ball 300 is misaligned with the first row 220, the ball 300 will still abut against the annular groove 210, so that the oil inlet pipe 200 is fixedly connected to the tee body 100. When the oil inlet pipe 200 is connected to the tee body 100, the ball 300 is moved into the annular groove 210 through the first row 220, and the limit ring 410 is pushed by the return spring 420 to squeeze the part of the outer wall of the ball 300 protruding from the first end of the tee body 100, so that the limit ring 410 moves to the position of blocking the limit hole 130, so that the ball 300 moves toward the axis of the first end of the tee body 100, thereby making more parts of the ball 300 protrude from the inner side wall of the first end of the tee body 100. In this state, the size of the ball 300 protruding from the inner side wall of the first end of the tee body 100 is greater than the depth of the first row 220, so that the ball 300 can no longer enter the first row 220, thereby realizing the cooperation between the ball 300 and the annular groove 210 to achieve the fixed connection between the oil inlet pipe 200 and the first end of the tee body 100.

[0039] Through the above-mentioned structure, when an external worker accidentally touches the sliding lock sleeve 400 and causes the sliding lock sleeve 400 to move close to the second retaining ring 120, even if the magnetic ring 430 magnetically attracts the ball 300 and moves the ball 300 to the limit position, a small part of the ball 300 will protrude from the inner side wall of the first end of the tee body 100, and the oil inlet pipe 200 or the tee body 100 must be rotated so that the first row 220 and the ball 300 are aligned before the oil inlet pipe 200 and the tee body 100 can be separated, which can better improve the stability and safety of the installation between the oil inlet pipe 200 and the tee body 100.

[0040] In some embodiments, an elastic baffle 221, which may be an elastic rubber sheet, is provided at the connection between the first channel 220 and the annular groove 210. When the oil inlet pipe 200 is connected to the first end of the tee body 100, the magnetic ring 430 magnetically attracts the ball 300. A small portion of the ball 300 still protrudes from the inner sidewall of the first end of the tee body 100. After the first channel 220 is aligned with the ball 300, the ball 300 can press the elastic baffle 221, causing the elastic baffle 221 to deform under pressure, thereby allowing the ball 300 to pass through the deformed elastic baffle 221 and enter the annular groove 210. When the oil inlet pipe 200 and the first end of the tee body 100 are disassembled, the magnetic ring 430 magnetically attracts the ball 300, and a small part of the ball 300 still protrudes from the inner wall of the first end of the tee body 100. The oil inlet pipe 200 or the tee body 100 is rotated so that the first row 220 is aligned with the ball 300, and then the staff applies a pulling force to make the ball 300 squeeze the elastic baffle 221, so that the elastic baffle 221 is compressed and deformed, so that the ball 300 can enter the first row 220 through the deformed elastic baffle 221, thereby realizing the separation of the oil inlet pipe 200 and the tee body 100.

[0041] It is worth mentioning that the elastic baffle 221 can play a certain blocking role for the ball 300. When an external staff member accidentally touches the sliding lock sleeve 400 and causes the sliding lock sleeve 400 to move close to the second retaining ring 120, even if the magnetic ring 430 magnetically attracts the ball 300 and moves the ball 300 to the limit position, a small part of the ball 300 will protrude from the inner side wall of the first end of the tee body 100. At this time, even if the first row 220 is aligned with the ball 300, the ball 300 will not enter the first row 220 due to the obstruction of the elastic baffle 221. The oil inlet pipe 200 and the first end of the tee body 100 can be avoided from being accidentally separated. Only after the first row 220 is aligned with the ball 300, the staff applies a pulling force to make the ball 300 squeeze the elastic baffle 221. After the elastic baffle 221 is deformed under pressure, the ball 300 can move into the first row 220, and the oil inlet pipe 200 and the first end of the tee body 100 can be separated, further improving the safety of the connection between the oil inlet pipe 200 and the tee body 100.

[0042] In some embodiments, a first identifier 111 is provided on the tee body 100 and a second identifier 230 is provided on the oil inlet pipe 200. Specifically, the first identifier 111 is provided on the first retaining ring 110 and the second identifier 230 is provided on the side of the annular groove 210 away from the first lane 220.

[0043] When the staff applies a force to the sliding locking sleeve 400 so that the sliding locking sleeve 400 moves close to the second retaining ring 120, the sliding locking sleeve 400 moves away from the first retaining ring 110, so that the first retaining ring 110 is exposed to the outside, and the staff can also observe the first identification body 111 on the first retaining ring 110. At this time, the oil inlet pipe 200 or the three-way body 100 can be rotated so that the first identification body 111 is aligned with the second identification body 230, that is, the first identification body 111 and the second identification body 230 are in the same straight line. At this time, the first row 220 and the ball 300 are also in the same straight line, so that the ball 300 can move into the first row 220, thereby facilitating the disassembly and assembly between the oil inlet pipe 200 and the three-way body 100.

[0044] In short, the above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention patent.

Claims

1. A high-efficiency diesel generator fuel injection device, comprising a tee body and a sliding lock sleeve sleeved over one end of the tee body; a limiting hole is provided on the circumferential side wall of the tee body, and a ball is disposed in the limiting hole; an annular limiting ring is provided in the middle of the inner side wall of the sliding lock sleeve, characterized in that: A magnetic ring is provided on the sliding lock sleeve on the side of the limiting ring close to the external connecting tube; when the magnetic ring moves to a position corresponding to the limiting hole, the magnetic ring can magnetically attract the ball to reduce the portion of the ball protruding from the inner wall of the tee body.

2. The high-efficiency diesel generator fuel injection device according to claim 1 is characterized in that: A limiting groove is provided in the middle of the limiting hole, and a limiting plate capable of extending into the limiting groove is provided on the ball. The ball can move in the axial direction of the limiting hole through the movement of the limiting plate in the limiting groove.

3. The high-efficiency diesel generator fuel injection device according to claim 2 is characterized in that: A first channel is provided on the end portion of the external connecting pipe connected to the tee body. The first channel extends along the axial direction of the external connecting pipe and is communicated with the annular groove. After the magnetic ring magnetically attracts the ball, the portion of the ball protruding from the inner side wall of the tee body can extend into the first channel.

4. The high-efficiency diesel generator fuel injection device according to claim 3 is characterized in that: When the limiting ring moves to a position corresponding to the limiting hole by squeezing the ball, the portion of the ball protruding from the inner side wall of the tee body is hemispherical or larger than a hemispherical shape; When the magnetic ring moves to a position corresponding to the limiting hole, the portion of the ball protruding from the inner side wall of the tee body is smaller than a hemisphere.

5. The high-efficiency diesel generator fuel injection device according to claim 3 is characterized in that: An elastic baffle is provided at the connection point between the first lane and the annular slot.

6. The high-efficiency diesel generator fuel injection device according to claim 3, characterized in that: The three-way body is provided with a first identification body, and the external connecting pipe is provided with a second identification body; When the three-way body and the external connecting pipe are aligned through the first identification body and the second identification body, the ball can extend into the first row.

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