JPH0138308Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an intake burner structure, and more particularly to an intake burner structure that is provided with a ceramic heater that is formed into a rectangular cross-section and has corners on its outer periphery.

[Technical background of the invention and its problems] Conventionally, as shown in FIG. 1, an intake system 1 of a diesel engine is equipped with an intake burner 2 as a starting assist device to improve starting performance in cold weather. Recently this intake burner 2 has heater 3
It has been proposed that the engine be made of ceramic and configured to quickly vaporize and combust the supplied fuel to heat the low-temperature intake air.

By the way, in the case of such an intake burner 2, fuel oil supplied from the fuel supply nozzle 4 is appropriately filled between the heater 3 and the holder 6 fixed to the burner housing 5 to cover the outer periphery of the heater 3, and steam is generated. It is important to promote oxidation in order to ensure reliable ignitability and stable fuel properties.

Therefore, in Utility Application No. 57-147052, the applicant proposed a heater 3 which is formed into a substantially rectangular cross-section for manufacturing purposes and has corner portions 7 on its outer periphery, as shown in FIG.
On the other hand, the above problem was solved by forming the inner periphery of the holder 6 into substantially similar shapes, and by making the narrow gaps S formed therebetween substantially equally spaced.

However, in such an intake burner 2, as shown in FIG.
Since the outer peripheral surface of the support member 8 for supporting the housing 5 is formed of a cylindrical surface, after the heater 3 is inserted into the holder 6 during assembly, bolts 9 are used to fix the support member 8 to the housing 5. When the support member 8 is brought into pressure contact with the stepped portion 10 of the housing 5, the support member 8 is rotated by the rotational force of the bolt 9, and as a result, the corner of the heater 3 is moved as shown in FIG. There was a problem that the parts 7 interfered with the inner circumferential surface of the holder 6 and were damaged, or that the optimum gap S could not be obtained.

Incidentally, as a related technique, "Fuel injection type auxiliary starting device for internal combustion engine" (Japanese Patent Application Laid-Open No. 1983-40230) has been proposed.

[Purpose of the invention] The present invention was devised in view of the above-mentioned problems, and its purpose is to maintain the narrow gap formed between the heater and the holder at approximately equal intervals,
Our goal is to provide an intake burner structure that can ensure product quality and performance.

[Summary of the invention] According to the invention, the above object is achieved by the following configuration.

That is, the heater has a non-circular cross section, a support member that holds the heater in a cylindrical burner housing, and an inner circumferential surface that is similar in cross-sectional shape to the heater, and has an outer circumferential surface that is similar to the outer circumferential surface of the heater. The burner housing includes a holder that surrounds the burner housing with equidistant gaps therebetween and is fixed to the burner housing, and a regulating means that restricts rotation of the support member to maintain the gap.

[Embodiment of the invention] A preferred embodiment of the invention will be described below in detail with reference to the accompanying drawings.

As shown in FIG. 4, reference numeral 2 denotes an intake burner, and a cylindrical burner housing 5 that forms the outer shell has a cylindrical inner circumferential surface inwardly formed with a substantially rectangular cross section. A heater 3 having a corner portion 7 on its outer periphery is provided. The heater 3 is supported by a support member 8 which is pressed by a bolt 9 screwed into the housing end 5a and is fixed in pressure engagement with the stepped part 10. Further, a holder 6 is fixed to the burner housing 5, which extends toward the flame protection cover 11 side and has a similar-shaped insertion hole 12 formed therein so as to allow the heater 3 to be inserted therethrough while maintaining equidistant gaps S at the outer periphery of the holder 6. Ru. Further, a fuel supply nozzle 4 for supplying fuel oil into the burner housing 5 is provided behind the holder 6 and penetrates the burner housing 5 from the outside in the radial direction. The above configuration is substantially the same as the conventional one.

By the way, the feature of the present invention is that the heaters 3 inserted into the holder 6 at approximately equal intervals are connected to the bolts 9.
The present invention is provided with a regulating means 13 for regulating the rotation caused by friction due to the rotation of the roller and maintaining the gap S appropriately.

In this embodiment, the regulating means 13 is constituted by a support member 8 whose outer peripheral surface has conventionally been formed into a cylindrical shape, and a fuel supply nozzle 4 provided so as to face the support member 8. More specifically, as shown in FIGS. 5 and 6, the side portion of the support member 8 facing the fuel supply nozzle 4 is cut away to form an engaging flat surface 14. Further, as shown in FIGS. 7 and 8, the fuel supply nozzle 4 has a lower end facing the support member 8 that extends downwardly so as to come into close contact with the engagement flat surface 14 of the support member 8. It is formed by 15. Therefore, as shown in FIG.
They are arranged in close contact with each other so as to restrict rotation of the support member 8 from the burner housing 5 side. Furthermore, these flat surfaces 14 and 15 are connected to the heater 3 and the holder 6.
The heater 3 is smoothly formed along the insertion direction of the heater 3 in order to form an appropriate equidistant gap S between the heater 3 and the holder 6, and when the heater 3 is inserted into the holder 6, they are engaged synchronously. There is. A groove 17 communicating with the outlet hole 16 is recessed at the lower end of the fuel supply nozzle 4 where such a flat surface 15 is formed.
Flat surface 14 of support member 8 brought into close contact with flat surface 15
The fuel holes 18 are divided into fuel holes 18 (FIG. 4).

In the present invention configured as described above, the support member 8, which attempts to rotate due to being dragged by the threaded engagement of the bolt 9, is restricted by the mutual engagement of the flat surfaces 14 and 15, thereby preventing rotation of the heater 3. can. Therefore, heater 3
It is possible to suppress interference between the holder 6 and the holder 6, and to form equidistant gaps S between them and hold them. As a result, appropriate performance can be obtained as the intake burner 2, and product quality can be ensured.

Further, in this embodiment, since the heater 3 can be inserted into the holder 6 only when the flat surfaces 14 and 15 are aligned with each other, the flat surfaces 14 and 15
It also functions as a guide surface for forming an appropriate gap S, thereby improving assembly workability.

[Modified Embodiment] FIGS. 9 to 14 show modified examples of the above embodiment.

In the one shown in FIG. 9, the regulating means 13 is composed of a support member 8 and a holder 6. As shown in FIGS. 9 to 11, the support member 8 has a holder side end 19 extending into the holder 6, and
The end portion 19 is formed into a substantially rectangular cross-section by cutting the opposing sides. Further, as shown in FIGS. 12 and 13, the holder 6 has a supporting member side end 20 formed in a substantially similar shape to the holder side end 19 extending inwardly. The outer peripheral side of the holder side end 19 of the support member 8 is inserted into the inner peripheral side of the support member side end 20 of the holder 6 in a substantially intimate state, so that rotation of the heater 3 is regulated. There is. In addition, a groove portion 21 is provided at the support member side end portion 20 of the holder 6.
are recessed and defined at the holder-side end 19 of the support member 8 through which the support member 8 is inserted, forming fuel passage holes 22 .

Note that the support member 8 is inserted between the support member 8 and the holder 6 along the axial direction with a predetermined gap L therebetween, so that the flow of fuel is not obstructed.

What is shown in FIG. 14 is a locking hole 23 in which the regulating means 13 is formed in the support member 8 along its radial direction.
and a locking pin 24 that is press-fitted from the outside of the burner housing 5 along the radial direction and inserted into the locking hole 23.

Even in these modifications, the end portions 19 and 20 as well as the locking pin 24 and the locking hole 23 are arranged so as to form an appropriate gap S between the holder 6 and the heater 3. It goes without saying that this embodiment also provides the same effects as the above embodiments.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

(1) Rotation of the heater can be prevented by restricting the supporting member that tries to rotate due to being dragged by the screwing of the bolt, and interference between the heater and the holder, which are formed in a rectangular cross-sectional shape with corners, can be restricted. .

(2) Therefore, it is possible to maintain an appropriate gap between the holder and the heater and to exhibit sufficient performance.

(3) It is also possible to ensure product quality during assembly.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing a conventional example, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a sectional view taken along the - line in Fig. 1, and Fig. 4 is a sectional view taken along the - line in Fig. 1. FIG. 5 is a partially cutaway side view showing a preferred embodiment of
6 is a sectional side view showing the support member, FIG. 6 is a sectional view taken along the - line in FIG. 5, FIG. 7 is a side sectional view showing the fuel supply nozzle, and FIG. 9 is a partially broken side view showing a modified example, FIG. 10 is a side sectional view showing a support member in the modified example, and FIG.
12 is a partial side sectional view showing the holder in a modified example; FIG. 13 is a sectional view taken along the line XII-XII in FIG. 12; and FIG. 14 shows another modified example. It is a partially broken side sectional view. In the figure, 3 is a heater, 5 is a burner housing, and 6 is a heater.
is a holder, and 13 is a regulating means.

Claims (1)

[Scope of utility model registration request] A heater having a non-circular cross section, a support member for holding the heater in a cylindrical burner housing, and an inner circumferential surface having a similar cross-sectional shape to the heater and equidistant from the outer circumferential surface of the heater. An intake burner structure comprising: a holder surrounding the burner housing with a gap therebetween; and a regulating means for regulating rotation of the support member to maintain the gap.