JPH04131511U - Combustion heater heat exchanger - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the heat exchange efficiency of the heat exchanger of a combustion type heater and to make it possible to downsize the heat exchanger. [Structure] The gas guide tube part 4a of the combustion tube 4 that guides the combustion gas in the combustion chamber 3 is inserted into the gas introduction tube 20, and the outlet 4b of the combustion tube 4 is opposed to the bottom cover 23 of the gas introduction tube 20. A combustion gas passage 24 is formed between the inner peripheral surface of the introduction pipe 20 and the outer peripheral surface of the combustion tube 4, and the discharge port 28 of the combustion gas passage 24 is provided near the open end of the gas introduction pipe 20. A spiral heat-absorbing fin 25 was provided on the inner circumferential surface of the housing. The combustion gas flowing out from the outlet 4c of the combustion tube 4 is guided by the heat absorption fins 25, and reaches the exhaust port 28 while swirling inside the gas introduction pipe 20.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a heat exchanger for a combustion type heater.

0002

[Conventional technology]

As a heat exchanger for a conventional combustion heater, one opening is closed by the bottom cover 23. a gas introduction pipe 200 (FIG. 6), and a gas introduction pipe 200 provided outside the gas introduction pipe 200 The side case, the combustion tube 4 provided inside the gas introduction pipe 200, and the gas introduction pipe 20 A fluid passage formed between the outer circumferential surface of the case 0 and the inner circumferential surface of the outer case, and the gas introduction pipe 20 0 and a combustion gas passage formed between the inner circumferential surface of the combustion tube and the outer circumferential surface of the combustion tube. Heat absorption fins 225 are provided on the inner peripheral surface of the pipe 200, and heat radiation is provided on the outer peripheral surface of the gas introduction pipe 200. The fins 30 are provided in a spiral shape to allow fluid such as engine cooling water to flow into the fluid passage. An inlet and an outlet for discharging the fluid that has received heat in the fluid passage are provided in the outer case. (Japanese Unexamined Patent Publication No. 62-77522).

0003 The combustion gas flows out from the outlet 4b of the combustion tube and hits the bottom cover 23 of the gas introduction pipe 200. The fuel then makes a U-turn, passes through the combustion gas passage, and is discharged to the outside from the exhaust port.

0004 On the other hand, the fluid flowing in from the inlet is guided by the radiation fins 30 into the fluid passage. and flows out from the outlet. When the fluid passes through the fluid passage, the fluid and combustion gas Heat exchange takes place between the combustion gas and the fluid, which absorbs heat from the combustion gas and becomes warmer.

[0005]

[Problem that the idea aims to solve]

However, as shown in FIG. 5 extends straight along the tube axis O, and as shown in FIG. Each protrudes toward the center of the gas introduction pipe 200, so that the inside of the combustion gas passage The combustion gas of is guided linearly parallel to the tube axis O, so that the passage time of the combustion gas is The combustion gas is discharged without sufficient heat exchange with the fluid. In addition to the problem of storage, there is also the problem of temperature unevenness in the combustion gas passage. There was also a problem.

[0006] This idea was made in view of these circumstances, and the challenge was to achieve high heat exchange efficiency. It is an object of the present invention to provide a heat exchanger for a combustion type heater that can obtain a high efficiency.

[0007]

[Means to solve the problem]

In order to solve the above-mentioned problem, this idea closes one end of the gas introduction pipe and removes the gas. Insert the introduction pipe into the outer case, and make sure that the inner peripheral surface of the outer case and the outside of the gas introduction pipe are A fluid passage is formed between the outer case and the outer case, and the inlet of the fluid passage is connected to one end of the outer case. The outlet is provided at the other end of the outer case to guide the combustion gas from the combustion chamber. Insert a combustion tube into the gas introduction tube, and close the outlet of the combustion tube to the gas introduction tube. A combustion gas is provided between the inner circumferential surface of the gas introduction pipe and the outer circumferential surface of the combustion tube, facing the closed end. forming a combustion gas passage, and providing an outlet of the combustion gas passage near the open end of the gas introduction pipe; The combustion gas flowing out from the outlet of the combustion tube passes through the combustion gas passage and exits from the exhaust port. In the heat exchanger of the combustion heater that is discharged, the combustion gas that has flowed into the combustion gas passage is A spiral heat-absorbing fin that swirls the burning gas and guides it to the exhaust port is connected to the gas inlet. It was installed on the inner circumferential surface of the tube.

[0008]

[Effect]

As mentioned above, the spiral heat-absorbing fins are provided on the inner circumferential surface of the gas introduction pipe, so the combustion tube The combustion gas flowing out from the outlet is guided by the heat absorbing fins and does not swirl inside the gas introduction pipe. The combustion gases reach the exhaust port smoothly throughout the combustion gas path. The passage time of combustion gas (combustion gas passage passage time) becomes longer.

[0009]

【Example】

An embodiment of this invention will be explained based on the drawings.

0010 FIG. 1 is a longitudinal section showing a combustion type heater equipped with a heat exchanger according to an embodiment of this invention. It is a front view. This combustion type heater exchanges heat between water sent from a pump and combustion gas. A heater that heats engine coolant and is installed in vehicles that heat engine coolant. It is. This combustion type heater is composed of a combustor 1 and a heat exchanger 2.

[0011] The combustor 1 includes a combustion tube 4 whose interior on one end forms a combustion chamber 3, and a combustion tube 4 formed of ceramic fiber. It consists of a disc-shaped lamp wick 5, a holding member 6, and a case 7.

0012 The combustion tube 4 is fixed to the case 7 via a flange 4b formed on its outer periphery. has been done. One end of the combustion tube 4 is closed with a wick 5, and the other end is closed with the inside of the heat exchanger 2. The gas guide cylinder portion 4a is formed by extending to a portion of the gas guide tube portion 4a. A combustion chamber 3 is provided on the inner periphery of the combustion tube 4. The opening forming member 8 having an opening 8a through which the flame and combustion gas generated inside the The flame and combustion gas generated in the combustion chamber 3 pass through the opening 8a to the gas. It is designed to enter into the gas guide cylinder portion 4a. In addition, the peripheral wall of one end of the combustion tube 4 has many A number of air inlet holes 9 are bored, and the air is introduced into an air passage 10 outside the combustion tube 4. The combustion air is now introduced into the combustion chamber 3 through the air inflow hole 9. ing.

[0013] The holding member 6 is fixed to one end side of the case 7, and the holding member 6 has the The lamp wick 5 is fixed. This holding member 6 has a fuel passage 6a and an opening 6b. It is formed.

[0014] Another case 11 is fixed to one end of the case 7. In this case 11 , a fuel supply pump 13 that sends liquid fuel to the lamp wick 5 via the fuel passage 6a, and a combustion The air is supplied to the air through the air passage 11a in the case 11 and the opening of the holding member 6. A swirl blower 14 for supplying combustion air to the air passage 10 is attached. Sara A glow plug 15 is detachably attached to the peripheral wall of the case 7, The ignition portion 15a of the glow plug 15 projects into the combustion chamber 3.

[0015] The heat exchanger 2 includes a cylinder located outside the gas guide cylinder part 4a of the combustion cylinder 4 and A cylindrical gas introduction pipe 20 whose end side is fixed to the other end side of the case 7, and this gas An outer case is located outside the introduction pipe 20 and has one end fixed to the other end of the case 7. A space 21 is provided. The outer peripheral surface of the gas introduction pipe 20 and the inner peripheral surface of the outer case 21 A fluid passage 22 is formed between the two. Outside the gas guide cylinder part 4a of the combustion cylinder 4 A combustion gas passage 24 is formed between the peripheral surface and the inner peripheral surface of the gas introduction pipe 20. .

[0016] A bottom cover (closed end) 23 is fixed to the other end of the gas introduction pipe 20 . Figure 1, fig. As shown in FIGS. 3 and 4, a spiral endothermic film is provided on the inner circumferential surface of the gas introduction pipe 20. A fin 25 is integrally provided. Further, on the outer circumferential surface of the gas introduction pipe 20, a radiation A heat fin 30 is fixed in a spiral manner.

[0017] As shown in FIG. 1, water is supplied to the outer case 21 from a pump (not shown). The inlet 26 allows the fluid to flow into the fluid passage 22, and the inlet 26 receives heat while passing through the fluid passage 22. An outlet 27 is provided to allow water to flow out.

[0018] A discharge port 28 for discharging the combustion gas that has passed through the combustion gas passage 24 is located in the case. It is set at 7.

[0019] Next, the operation of the combustion type heater having the above configuration will be explained.

[0020] When you turn on the operation part (not shown) to start heating, a vortex flow for supplying combustion air is generated. The blower 14 blows combustion air through the air passage 11a in the case 11 and the opening of the holding member 6. into the combustion chamber 3 through the mouth portion 6b, the air passage 10, and the air inlet hole 9 of the combustion tube 4. be introduced. On the other hand, liquid fuel is supplied by the fuel supply pump 13 through the fuel passage 6a. It is supplied to the lamp wick 5, and temporarily impregnated into the lamp wick 5.

[0021] Then, a voltage is applied to the glow plug 15, and its ignition part 15a becomes high temperature. Then, the liquid fuel impregnated in the lamp wick 5 is vaporized, and this vaporized liquid fuel and combustion air are The air-fuel mixture is ignited in the combustion chamber 3 and a flame is generated.

[0022] The flame generated in the combustion chamber 3 and its high-temperature combustion gas flow through the opening 8a and the gas guide. It passes through the inner cylinder part 4a, makes a U-turn by the bottom cover 23, and is introduced into the combustion gas passage 24. The combustion gas introduced into the combustion gas passage 24 is guided by the heat absorption fins 25 and becomes a combustion gas. It advances while rotating inside the burnt gas passage 24 and is discharged from the discharge port 28. combustion gas While passing through the combustion gas passage 24, heat is transferred from the combustion gas to the heat absorption fins 25 and the gas is The gas introduction pipe 20 becomes hot.

[0023] On the other hand, the engine cooling water flowing in from the inlet 26 is guided by the heat radiation fins 30. The fluid flows toward the outlet 27 while swirling inside the fluid passage 22 . Inside the fluid passage 22 While passing through the engine cooling water, the engine cooling water receives heat from the heat radiation fins 30 and the gas introduction pipe 20. It is absorbed and warmed, and flows out from the outlet 27 to a heater heater (not shown) installed in the vehicle interior. The heater core exchanges heat with the air to heat the interior of the vehicle.

[0024] According to the heat exchanger 2 of this embodiment, as described above, the air flows out from the outlet 4c of the combustion tube 4. The burned combustion gas is guided by the heat absorption fins 25 and is exhausted while swirling inside the gas introduction pipe 20. Since the combustion gas reaches the outlet 28, the passage time of the combustion gas becomes longer, and the engine cooling water and the combustion Sufficient heat exchange with the gas occurs, improving the heat exchange efficiency of the heat exchanger and reducing the Since the combustion gas flows smoothly throughout the combustion gas passage 24, the combustion gas passage 2 Temperature unevenness within the chamber 4 is eliminated, and efficiency is also improved from this point of view.

[0025] In the above embodiment, one heat absorbing fin 25 is used, and We have described the case where the slope is increased, but instead of this, as shown in Figure 5, By using a number of heat absorbing fins 125, their inclination is reduced, and the ventilation resistance of combustion gas is reduced. Even if it is reduced, the same effect as in the above embodiment can be obtained.

[0026]

[Effect of the idea]

As explained above, according to the combustion type heater heat exchanger of this invention, the gas introduction pipe Since spiral heat absorption fins are provided on the inner circumferential surface of the combustion chamber, the combustion gas flowing out from the outlet of the combustion tube is The gas is guided by the heat absorbing fins and rotates inside the gas inlet pipe until it reaches the outlet. This increases the passage time of the combustion gas and ensures sufficient heat exchange between the fluid and the combustion gas. At the same time, the combustion gas flows smoothly throughout the combustion gas passage, reducing temperature unevenness. does not occur. Therefore, the heat exchange efficiency of the heat exchanger is improved, and the size of the heat exchanger is also improved. Contribute to

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a combustion type heater equipped with a heat exchanger according to an embodiment of the invention.

FIG. 2 is a plan view showing a gas introduction pipe.

FIG. 3 is a longitudinal sectional view of the gas introduction pipe.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is a longitudinal sectional view of a gas introduction pipe of a heat exchanger according to another embodiment of the invention.

FIG. 6 is a longitudinal sectional view of a gas introduction pipe of a conventional heat exchanger.

FIG. 7 is a sectional view taken along VII-VII in FIG. 6;

[Explanation of symbols]

2 Heat exchanger 4 Combustion tube 4b Combustion tube outlet 20 Gas introduction pipe 21 Outer case 22 Fluid passage 23 Bottom cover (closed end) 24 Combustion gas passage 25 Endothermic fin 26 Inlet 27 Outlet 28 Outlet

Claims (1)

[Scope of utility model registration request] 1. One end of the gas introduction tube is closed, the gas introduction tube is inserted into an outer case, and a fluid passage is formed between the inner circumferential surface of the outer case and the outer circumferential surface of the gas introduction tube. ,
An inlet of the fluid passage is provided at one end of the outer case, an outlet thereof is provided at the other end of the outer case, and a combustion tube for guiding combustion gas in the combustion chamber is inserted into the gas introduction pipe,
The outlet of the combustion tube is opposed to the closed end of the gas introduction tube, a combustion gas passage is formed between the inner peripheral surface of the gas introduction tube and the outer peripheral surface of the combustion tube, and the outlet of the combustion gas passage is formed to face the closed end of the gas introduction tube. In the heat exchanger of the combustion type heater, which is provided near the opening end of the gas introduction pipe, and in which the combustion gas flowing out from the outlet of the combustion tube passes through the combustion gas passage and is discharged from the exhaust port, A heat exchanger for a combustion type heater, characterized in that spiral endothermic fins are provided on the inner circumferential surface of the gas introduction pipe for swirling the inflowing combustion gas and guiding it to the exhaust port.