JPS59153966A - Fuel injection pipe covering structure of diesel engine - Google Patents

Abstract

PURPOSE:To reduce the repairing cost and the replacement parts cost and reliably detect the oil leakage by providing a cover pipe with a capacity larger than that of a fuel injection pipe and providing an oil leakage detecting section in one body with the cover pipe. CONSTITUTION:A cover pipe 14 has a capacity sufficiently larger than that of a fuel injection pipe 13 and covers all over the fuel injection pipe 13. The distance between the inner peripheral surface of the cover pipe 14 and the outer peripheral surface of the fuel injection pipe 13 is such a distance that even the low-quality fuel oil with high viscosity can quickly flow to the lower end portion of the cover pipe 14 without being clogged. In addition, an oil leakage detecting section 37 is formed on the side wall of the lower end portion of the cover pipe 14, and an oil leakage detecting pipe 38 is screwed to the oil leakage detecting section 37. The detecting pipe 38 is connected to a fuel tank, and a pressure-type or an electric-type oil leakage detecting alarm unit detecting that the leaked oil starts to flow through the detecting pipe 38 and generating an alarm by a lamp, etc. is provided on the way, for example.

Description

[Detailed description of the invention]

The present invention relates to a fuel injection pipe covering structure for a diesel sluice gate. A conventional chin shot target ta h' has a structure as shown in FIG. 1, for example. That is, in FIG. 1, a cladding tube 2 that follows the shape of the injection tube 1 is placed over a winding injection tube 1, and a slight gap is provided between the inner circumferential surface of the cladding tube 2 and the outer circumferential surface of the injection tube 1. There is. The cladding tube 2 has three members 2a,
2b, 2(l), each part 102a%
2b% 2c are connected to each other by brazing. The gap between the cladding tube 2 and the injection tube l communicates with an oil leakage detection metal fitting 7 through a narrow perforation hole 6 of the injection tube cotton nut 5. Reference numeral 8 is a fuel injection pump. That is, when the injection pipe 1 is damaged and high-pressure fuel oil leaks, the cladding tube 2 prevents the leakage from being spouted to the outside and prevents the oil from leaking. The gap between the cladding tube 2 and the injection tube 1 is opened through a hole 6, and the oil is guided to the detection metal fitting 7, and then returned to the fuel tank via the pipe 9.The leakage of oil from the pipe 9 to the fuel tank can be confirmed by visual inspection, for example. or check that an appropriate oil leakage detection alarm device is installed. However, the following problems occur with the sheathing structure shown in Figure 1: The cladding tube 2 cannot be removed from the 100 liters of injection pipes because they are separated by a gap and the cladding tube 2 is generally curved in a meandering shape. Therefore, when replacing the injection pipe 1, the four pipes 2 to be replaced must also be replaced, which increases the cost. By the way, the 11th Δ Y'l:t ”r 2 is made of aluminum tube, and it is straight 4.Me-shaped +: before bending.
s M4 pipe 1 with planar multiplexed pipe covering parts 2a, 2b, 2
Set c in lt'A inset A, and each part 2a, 2b, 2
c is hot-formed together with the If4 MJ pipe l into the shape shown in Fig. 1, and then the respective parts 2a, 2b, and 2c are brazed. (2) Viscous IY-5 ax: When using the G fuel curve, fuel leakage may clog in the gap between the G tube 2 and the sealed tube 1, and the hole 6 may cause damage to the injection tube. Time III
'i Oil may not be detected. If the above-mentioned perforation 6 or the like is bent, the fuel leakage pressure inside the cladding tube 2 will increase, and there is a risk that the cladding tube 2 will also be damaged. The present invention aims to solve the above-mentioned discrepancies.
The gist of the system is to cover the entire injection pipe with a wide gap from the outer periphery of the injection pipe using a coated U-tube that has a sufficiently larger volume than the injection pipe, and to inject fuel independently of the injection pipe using the cladding pipe. It can be attached to and detached from the pump, and the 146 oil detection section is integrally formed on the cladding tube. The present invention will be explained below based on the drawings. In FIG. 2, 11 is a parallel pressure type smoke injection pump, 12 is a joint pipe on the injection nozzle side, and a fuel injection pipe 413 connects between the two.
The whole is covered with a cladding tube 14. The injection 1f13 extends upward from the vertically oriented injection pump 11, smoothly curves three-dimensionally in the middle (FIGS. 2 and 3), and reaches the horizontally oriented joint pipe 12. Tapered portions 15.16 are formed at both ends of the injection pipe 13, respectively 9, and the tapered portions 15.16 abut on the i-body handle 12 and the circular receiving holes 17.18 of the injection pump 11, respectively. There is. A cap nut 1 is attached to the male threaded portion 12a of the joint pipe I2.
9 is screwed on, and the holed bottom 19a of the bag neck 19 engages with the flange portion 21 of the injection WI3 via the annular stopper 20, pressing the tapered portion 15 against the conical receiving hole 17. Reference numeral 22 denotes an O-ring, which is disposed between the inner circumference of the tip of the cap nut 19 and the outer circumference of the joint tube 12. A cap nut 23 is screwed onto the male threaded portion 11a of the injection pump 11 in the same way as the joint pipe 12.
3a engages with the flange portion 25 of the 1-11 injection tube 13 via the annular stopper 24, and presses the circle #1 into the shape receiving hole 18 with the taber i11<16. 27 is an O-ring,
It is compressed between the lower end surface of the bag nand 23 and the upward step of the injection pump 11. The cladding tube 14 is a cast product, has a sufficiently larger volume than the injection tube 13, and covers the entire injection tube 13 at a wide interval from the outer peripheral surface of the injection tube 13. That is, an oil leakage chamber 29 with a large volume is formed between the inner circumferential surface of the cladding tube 14 and the outer circumferential surface of the injection tube 13. The distance between the inner circumferential surface of the cladding tube 14 and the outer circumferential surface of the injection tube 13 is such that even a highly viscous low direct fuel oil can quickly flow to the lower end of the cladding tube 14 without clogging;
And the three-dimensionally bent injection pipe 13 is covered with a cladding pipe 1.
The gap is such that it can be freely inserted into and extracted from the cladding tube 14 through the opening at at least one end of the cladding tube 14, and the bag neck l
-19 (or 23) is the distance that allows the cladding tube 14 to pass from one end opening to the other end opening with a margin. The cladding tube 14 is bent into a shape roughly similar to that of the injection tube 13, and the lower end of the cladding tube 14 is fitted into the outer circumferential surface of the upper end of the bag 23 via an O-ring 30. The upper side of the cladding tube 14 (1 wood handle)'!12IIIj1)
The other end is fitted to the outer periphery of the bag nand 19 via an O-ring 31 in several orders of magnitude. Further, the cladding tube 14 is supported by a shilling block 33 via a support arm 32. As shown in FIG. 4, the lower end 11tlI wall of the cladding tube 14 has an oil leakage outlet female hole 35 and an oil leakage detection tube mounting seat 36.
An oil leak detection section 37 is formed, and an oil leak detection section 38 is screwed onto the oil leak detection section 37. Detection tube 38
reaches the fuel tank, but on the way, for example, a pressure-type or electric-type iJ+4 oil detection alarm device i detects that oil leakage has begun to flow inside the detection tube 38 and issues an alarm with a lamp or the like.
I'm getting over t. Note that it is not always necessary to turn on the oil leakage detection alarm device as described above; for example, the oil leakage can be confirmed by visually observing the oil dripping from the oil leakage detection part 38 into the fuel tank or other oil leakage receiving part, and then the oil can be injected. It may be possible to make it possible to know if w13 is damaged or the like. There are still oil leak holes 40.4 in each cap nut 19.23 in Figure 2.
J

[When the fuel is turned on, the combustion pipe is guided into the cladding tube 14. If the injection pipe 13 is damaged or cracked, the oil will leak into the leakage chamber 2.
9 quickly flows downward, passes through the female threaded hole 35,
a: i) J+ detection? 738, and the occurrence of oil leakage is confirmed visually or by a smart alarm device I-''t.Of course) The fuel oil leakage that spouts out at high pressure from the damaged part of Since it is completely blocked by the revolving r-ii 4, it will not scatter to the outside.The assembly work of the injection pipe 13 and the shielded pipe 14 is carried out as follows. 20.2
4 is fitted into the injection pipe 13 before forming the tapered portion 15, 16 of the injection pipe 13. 1 “1 shot” & 1
3 to one of the caps, e.g., the cap 1-19 (and the dowel 20) connected to the joint Ml' l2, and the cladding tube 1.
4 into the opening at the lower end of the tube 14, and insert the outer circumferences of both bags 19 and 23 into the inner circumferential direction of the openings at both ends of the tube 14.
They fit together via rings 31 and 30. Next, press each tenor (parts 15 and 16 onto the receiving part 17.18, and insert each bag nand 19 and 23 into each male thread part 12a and lla by 1-'+
! +i! 'i' jlj P kte two 4? - Support the seat JU YsV ft 14 on the cylinder bronch 33 using the toe arm 32. 1! When removing the j3 ejection tube 13, insert both caps 19 and 23 into each male threaded portion 12.
a After removing it from the IC, insert the injection tube 13 into the bag
．． 23 as well as him'j,'l:t g 14. That is, if the 1g14 injection tube 13 is damaged, it is only necessary to replace the injection tube 13(1) with a new one, and there is no need to replace the 1g14 injection tube 14. 5 and 6 show a second embodiment, in which the cladding tube 14 is divided into two members 1, 1. a, 14b, both parts tt 14a, 14b flange parts 51, 5
2 f@'J (This is an example in which the port 53 of the book is connected via the shipping packing 54. In the structure shown in Fig. 5, the cover t\f1
4 and the injection pipe 13 becomes easier. Of course, an oil leak detection section (37) as shown in FIG. 4 is formed at the lower end of the cladding tube 14 in FIG. Also, the injection bond 11 in FIG. 5 is a parallel pressure pump like the injection pump in FIG.
It is. In FIG. 5, parts corresponding to those in FIG. 2 are given the same numbers as in FIG. 2. 7 and 8 show the third and fourth embodiments, which are examples in which the high pressure injection pump 11' is applied to an engine. FIG. 7 shows an example in which the cladding tube 14 is formed as an integral casting as in FIG. 2, and FIG. 8 shows an example in which the cladding tube 14 is divided into upper and lower halves as in FIG. 5. In Figure 1447 and i8, the position of the O-ring 27, which is placed between the injection pump "l1' and the bag nand 23, is different from that in Figures 2 and 5. 0 between the inner peripheral surface of the lower end and the outer peripheral surface of the lower end of the male thread part 11'a
Link 27 is marked Vt. Of course, the coating 914 shown in Figs. 7 and 8 also has an oil leakage detection section (37) as shown in Fig. 4.
is formed. Note that in FIGS. 7 and 8, parts corresponding to those in FIGS. 2 and 5 are given the same numbers as in FIGS. 2 and 5. Figure 9 shows an example of 5 days h1 [i, tlI temperature/111 in the oil chamber 29, high temperature water or high temperature? (IL steam, etc.)
The injection pipe 13 is kept warm by passing the heat medium through it. That is, a heating medium inlet portion 61 is provided at the end portion of the covering 1140F, and this inlet portion 61 is connected to a heating medium supply source via a heating medium supply pipe 62. An outlet part 63 is formed, and a return pipe 64 is connected to the outlet part 63. As the hot water or high-temperature oil for the heating medium, 6) warm cooling water immediately after receiving heat in the engine is used. Alternatively, high temperature cooling oil can be used. Fuel injection pipe 1 even when the engine is stopped
When the heat insulation described in step 3 is included, for example when low-quality heavy oil is used as fuel, a dedicated heat exchanger for heating the heating medium and a medium supply pump that can be operated even when the engine is stopped are provided. The cladding tube 14 shown in Figure 9 is integrally formed with a pressure sensor mounting part (detection female screw hole and mounting seat) 66, and a pressure sensor 67 is connected (screwed) to this mounting part 66. . In other words, due to damage to the injection pipe 13, 9611 songs were recorded at high pressure.
When 1 is released, the pressure inside the bent oil chamber 29 increases. However, when the pressure inside the oil leakage chamber 29 exceeds the specified f+E, the sensor 67
is activated and an alarm is issued by a buzzer, etc. According to the 4th Inn's ha construction, the fuel injection pipe 13 can be well kept warm, so it is possible to maintain the temperature of the fuel injection pipe 13 well.
Reduce viscosity within 713! 7j, improving the operating performance of the engine. In FIG. 9, the same parts as in FIG. 2 are given the same numbers as in FIG. 2. In addition, although the injection pump 11 in FIG. 9 is of a parallel pressure type, the structure of the medium inlet part 61 and the medium outlet part 63 is different from that of the straight type injection pump 11 shown in FIGS. 7 and 8.
′ can also be applied. As explained above, the present invention provides injection 'tt
If the fuel is injected with a wide distance between the outer peripheral surface of the fuel injection bong 11 (111), the cladding tube 14 and the injection pipe 13 can be independently connected to the fuel injection bong 11 (111). Then, in the case 14, there is a detection part 37, for example, the female threaded hole 35 and 71i. Since the oil detection tube mounting seat 36 is integrally formed: (1) If the injection tube 13 is damaged, only the injection tube 13 needs to be replaced, and the cladding tube 14 can be used again, reducing repair costs. And replacement parts costs are low. (2) According to the structures in Figures 2, 5, 7, and 8, 1
The distance between the outer circumferential surface of the injection pipe 13 and the inner circumferential surface of the coating 14 is wide, and the oil leakage detection part 37 (female threaded hole 35) is formed directly on the coating tube 14, so that high viscosity and low quality oil can be removed. Even if the IIA upper tube is damaged when fuel oil is used, the leaked oil can be quickly discharged from the detection part 37 without clogging, and 1111 oil can be reliably detected. With the structure shown in FIG. 9, the medium can be quickly discharged from the medium outlet section 63. However, in the conventional example shown in FIG. 1, high-pressure fuel oil leaks into the cladding tube 2 due to clogging of low-quality fuel oil between the borehole 6 or the inner peripheral surface of the cladding tube 2 and the outer peripheral surface of the injection tube 1. There is a fear that the cladding tube 2 itself may be damaged due to the cladding being trapped in the water, but the present invention eliminates such worries at all. (3) Since the oil leak detection part 37 (66) is integrally formed with the cladding tube 14, there is no need to remove the detection hardware 7 as in the conventional example shown in FIG. Become cheap.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional example, and FIG. 2 is a first example of the present invention.
A vertical sectional view showing the embodiment (■-11 sectional view in Fig. 3), Fig. 3 is a view taken in the direction of the In arrow in Fig. 2, and Fig. 4 is a view taken along IV-m in Fig. 3.
The V cross-sectional partial view, and FIGS. 5, 7, 8, and 9 are vertical FM views respectively showing the second, third, fourth, and fifth embodiments of the present invention. ■It is an arrow view. 11 (11')・
...Fuel 1 injection pump, 13...Fuel injection pipe, l 4
Kawanami casing pipe, 37...Oil leak detection section 66...Pressure sensor mounting section (another example of oil detection section a) Patent applicant
Yanmar Diesel Co., Ltd. Agent Patent Attorney Tadataka Omo Figure 1 Figure 2 11 ″'1W W Figure 4 Figure 7 Figure S (?Figure

Claims (1)

[Claims] The fuel injection pipe and the cladding tube have a sufficiently large g product. The diesel 4k is characterized by being able to be independently attached to and detached from the fuel injection pump, and having an oil leak detection part integrally formed in the cladding tube.
) Seki's fuel injection pipe coating structure.