JPH0615270Y2 - Hot air heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a hot air heater having a cylindrical combustor.

[Prior Art] A hot air heater having a combustor is disclosed in, for example, Japanese Utility Model Laid-Open No. 54-9805.
The configuration is as shown in Japanese Patent Publication No. That is, the third
As shown in FIG. 5 to FIG. 5, an air passage in which a convection air blower 2 that blows indoor air is assembled is formed in the main body casing 1, and a combustor 3 and a heat exchanger coupled thereto are formed in this air passage. And 4 are provided. The combustor 3 has a horizontally long configuration in which a combustion cylinder 5 that forms a combustion chamber is attached to a burner, and is supported at both ends in such a manner as to traverse the ventilation passage as illustrated. The support of the combustor 3 that repeats thermal expansion and contraction is configured to allow expansion and contraction. That is, the burner side is fixed to the main body casing 1 with a screw through the fixing plate 6, but the other end side of the combustion tube 5 does not restrain the movement within a certain range in the longitudinal direction. As shown in FIGS. 4 and 5, it is flexibly supported by a stepped screw 21 through a support plate 20 having a long hole. Incidentally, the total length L of the combustion cylinder 5 during combustion is Next to Only grows. In addition, α is a linear expansion coefficient of the constituent material of the combustion cylinder 5, Tf is the temperature of the combustion chamber during combustion, and T is the temperature of the combustion chamber during non-combustion. Combustion cylinder 5 described above
Since the burner side is rigidly fixedly supported on the burner side, it extends on the opposite side, and the long hole is allowed to slide relative to the stepped screw 21. However, not all the load of the combustion cylinder 5 is applied to the stepped screw 21, and most of the load of the combustion cylinder 5 is the support plate 20.
Is supported by a receiving surface 24 of a hooking portion 23 on the main body casing 1 side on which a supporting portion 22 formed integrally with is mounted. Therefore, the supporting portion 22 slides on the receiving surface 24, so that thermal expansion stress is not applied to the combustor 3 and a stable function is achieved.

[Problems to be Solved by the Invention] In the conventional hot air heater, although the combustor 3 is not subjected to stress due to its thermal expansion, the supporting portion 22 of the combustor 3 receives the main casing 1 side during expansion and contraction. Face 24
Since it slides on the upper surface, there are problems to be solved such as frictional noise and abnormal noise due to catches such as burrs on the support portion 22 and the receiving surface 24.

The present invention has been made in order to solve such a conventional problem, and an object thereof is to obtain a hot air heater in which almost no abnormal noise is generated due to thermal expansion or contraction of the combustor.

[Means for Solving the Problems] In the warm air heater according to the present invention, one end side of the combustor is rigidly supported by the main body casing, and the other end side is subjected to thermal expansion and contraction in the longitudinal direction by elastic deformation. It is suspended from the main body casing by an allowable suspension member.

[Operation] In the hot air heater according to the present invention, the thermal expansion and contraction of the combustor causes the elastic bending and elastic return of the suspension member that suspends and supports one end of the combustor to cause friction and sliding points. It will be allowed without inclusion.

[Embodiment] Although FIG. 1 and FIG. 2 both show an embodiment of the present invention, the basic structure of the warm air heater except the structure related to the attachment of the combustor is also shown in the drawings. As can be seen, the description is the same as the above-mentioned conventional example, and therefore the description thereof is omitted to avoid duplication. Combustor 3 in the hot air heater of this embodiment
In both cases, basically, one end side on the burner side is rigidly supported by the main body casing 1, and the other end side, which is the connection side with the heat exchanger 4, allows thermal expansion and contraction in the longitudinal direction by elastic deformation. It is suspended from the ceiling of the main body casing 1 via the suspension member 7 and is mounted in a beam form as a whole.

The one shown in FIG. 1 is opposite to the side of the combustor 3 rigidly supported on the free end side of the angled plate-shaped suspension member 7 screwed to the inner surface of the top of the main body casing 1. The side edges are screwed together. When the combustor 3 thermally expands in the longitudinal direction of the suspension member 7, the vertical portion 7a elastically bends to allow expansion, and when it contracts, the suspension member 7 follows elastic recovery. Bending stress is generated in the suspension member 7 as described above, but the bending stress can be reduced by forming the suspension member 7 thin. The stress is obtained from the expansion amount of the combustor 3, and the length h of the vertical portion 7a of the suspension member 7 is set so that the bending stress is equal to or less than the metal fatigue limit with respect to the target number of expansion and contraction times of the device. Is set. In the embodiment shown in FIG. 2, the suspension member 7 is made of a rod-shaped material instead of a plate material.
Since both of them support the load of the combustor 3 from above, it is easier to set the bending stress below the metal fatigue limit of the suspension member 7 than when supporting from the horizontal direction or from below.

That is, in any of the above-described embodiments, the elastic bending operation of the suspension member 7 that allows the thermal expansion and contraction of the combustor 3 does not include the movement accompanied by sliding or catching, so that the friction noise or the abnormal noise accompanying the catching occurs. Will not occur.

[Effects of the Invention] As described above, according to the hot air heater of the present invention, the thermal expansion and contraction of the combustor is caused by the elastic deflection and elastic return of the suspension member that suspends and supports one end of the combustor. Since it is allowed without friction or sliding, it is possible to eliminate the generation of friction noise or abnormal noise due to catching.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the warm air heater according to the present invention, FIG. 2 is an overall configuration diagram showing another embodiment, and FIG.
FIG. 4 is a front view showing the structure of a warm air heater as a conventional example, and FIGS. 4 and 5 are explanatory views showing the mounting structure of the combustor shown in FIG. 3, respectively. In the figure, 1 is a main body casing,
3 is a combustor, 4 is a heat exchanger, 6 is a fixed plate, 7 is a suspension member, and 7a is a vertical part. The same reference numerals in the drawings indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Open 61-169349 (JP, U) Open 51-88946 (JP, U) Open 53-140952 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A suspension member which has one end side of a cylindrical combustor rigidly supported by the main body casing in the main body casing and the other end side of which allows thermal expansion and contraction in the longitudinal direction of the combustor by elastic deformation. A warm air heater characterized by being suspended by the above main body casing.