JPH0415426A - Refrigerant heater - Google Patents

Abstract

PURPOSE:To improve a heat exchanging rate and to make shell temperature of a cylinder uniform by providing a bottomed cylindrical baffle in a heat exchange cylinder having a refrigerant tube on an outer periphery and a fins on an inner periphery, forming a combustion gas exhaust passage between the outer periphery and the inner periphery, and providing a plurality of holes on the outer periphery of the baffle. CONSTITUTION:The air from an air supply port 8 becomes combustion gas by a burner 1, most if the air is fed to the center of a heat exchange cylinder 2 having a small flowing resistance, once introduced into a bottomed cylindrical baffle 5 to become turbulent flow wound in a vortex in the bottom 5a of the baffle to be jumped up. Accordingly, it is discharged from a plurality of holes 20 of the periphery of the baffle 5 out of the baffle 5. This combustion gas is collided with a fin 4, directed from an exhaust passage 7 toward an exhaust port 6, but since the plurality of round holes 20 are provided, it is uniformly diffused on the outer periphery of the baffle 5 to be injected, and efficiently heat exchanged with the fin 4 of the inner periphery of the cylinder 2. Accordingly, temperature distribution is made uniform to suppress thermal stress to affect influence to the durability of the cylinder 2.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to air conditioning. In particular, it relates to a refrigerant heating device.

[Conventional technology]

Figures 9, 10, and 11 are 2, for example, JP-A-1-1
92 is a longitudinal sectional view showing a conventional refrigerant heating device disclosed in Japanese Patent No. 42371, (1) is a burner, (2) is a heat exchange cylinder connected to the burner (1), (
3) is a refrigerant pipe attached to the outer surface of this heat exchange cylinder, (4)
) is a plurality of fins extending along the axial direction on the inner peripheral surface of the heat exchange cylinder (2), (5) is a bottomed cylindrical baffle,
(5a) is the bottom of the baffle, +6) ilJ cylinder.

(D and (8) are the exhaust passages for the combustion gas introduced into the heat exchange cylinder (2), and D and (8) are the intake ports for the combustion air.

Next, the operation will be explained.

As shown in FIG. 9, the air sucked through the air supply port (8) is mixed with fuel in the burner (1) and ignited to become combustion gas. The combustion gas normally passes through the heat exchange tube (2) and is released to the outside of the machine through the exhaust tube (6), but this heat exchange tube (
2) There is a baffle (5) inside the burner (1), so the combustion gas that leaves the burner (1) enters the baffle (5), and when it reaches the bottom of the baffle (5a), it is repelled and passes through the baffle. (5
) is discharged from the exhaust pipe (6) through the exhaust passage (7) provided between each of the fins (4) extending on the inner peripheral surface of the heat exchange pipe (2). .

During this time, the thermal energy of the combustion gas itself is

One is indirectly transmitted from the baffle (5) to the fins (4), and the other is directly transmitted from the combustion gas itself to the fins (4). Next, the heat transferred from the combustion gas to the fins (4) is transferred from the inner peripheral surface to the outer peripheral surface of the heat exchange cylinder (2), but the refrigerant pipe (3) is Since the refrigerant is attached to the heat exchange tube (2), the refrigerant entering from the refrigerant inlet (3a) is gradually heated while flowing through the pipe, and then flows out from the refrigerant outlet (3b).

With this movement, the heat generated by the burner (1) is exchanged with the refrigerant flowing in the refrigerant pipe (3).

[Problem to be solved by the invention]

Since the conventional refrigerant heating device is configured as described above, the outer temperature of the heat exchange cylinder is extremely high from the burner outlet to the baffle inlet and the exhaust port, as shown in Figure 12. The edge between the inlet and the bottom of the baffle is not that high. This is because the combustion gas coming out of the burner outlet and the combustion gas rebounding from the bottom of the baffle collide with each other, and the high temperature combustion gas stays around this area. This is because the diameter of the exhaust port is very small compared to the diameter of the exchange tube, so the outflow speed of the combustion gas cannot keep up, and the high temperature combustion gas stagnates there as well.

On the other hand, combustion gas always flows at a constant speed between the inside and outside of the baffle, and because there is distance from the burner, the temperature of the combustion gas does not rise that high.

As a result, temperature differences as shown in Figure 12 occur even within the same heat exchange cylinder, resulting in a large amount of thermal stress, resulting in poor durability and gas leakage from cracks, cracks, etc. There were very dangerous problems such as the occurrence of

This invention was made to solve the above-mentioned problems, and it eliminates temperature differences within a single heat exchange cylinder, suppresses thermal stress to a level that does not affect durability, and is extremely efficient. The objective is to obtain a high-efficiency refrigerant heating device with good performance.

[Failure to solve the problem]

In the refrigerant heating device according to the first aspect of the present invention, the hot combustion gas flowing into the baffle is transferred to the bottom surface of the baffle on the circumferential surface of the baffle adjacent to the fins extending on the inner circumferential surface of the heat exchange cylinder. This baffle reduces the amount of combustion gas flowing out from the inlet, lowering the temperature of the combustion gas flowing out, and is provided with a plurality of holes that can release the amount of combustion gas and heat inside the baffle.

Further, in the refrigerant heating device according to the present invention of claim 2, high-temperature combustion gas flowing into the baffle is placed inside the circumferential surface of the baffle adjacent to the fins extending on the inner circumferential surface of the heat exchange cylinder. At the bottom of the baffle, there is an amplification adjustment plate that can reduce the amount of combustion gas flowing out from the baffle inlet, lowering the temperature of the combustion gas flowing out, and amplifying the amount of heat exchange of the combustion gas within the baffle. It is.

[Effect]

A refrigerant heating device according to claim 1 of the present invention.

This is achieved by providing a plurality of holes on the circumferential surface of the baffle adjacent to the fins extending on the inner circumferential surface of the heat exchange cylinder.

High-temperature combustion gas flows in from the burner.

It bounces off the bottom of the baffle and prevents it from flowing out into the baffle again, and when it flows out while still at a high temperature, it flows inside the baffle. Because it can be released through this hole to the exhaust passage between.

In addition to suppressing the temperature near the burner outlet and baffle inlet, which have been high until now, we also raise the temperature of the outer shell of the heat exchange cylinder, which is the outside of the baffle, where the temperature did not rise (in other words, improve the heat exchange efficiency in this area) Since the outer shell temperature of the heat exchange cylinder can be equalized, thermal stress can be suppressed.

Advantageously, the refrigerant heating device according to claim 2 of the present invention provides an amplification adjustment plate inside the circumferential surface of the baffle adjacent to the fins extending on the inner circumferential surface of the heat exchange cylinder, so that the burner The high-temperature combustion gas flowing in bounces off the bottom of the baffle, preventing it from flowing out from inside the baffle.

It is possible to retain high-temperature combustion gas in the baffle for a long time and amplify the amount of heat exchanged through the baffle to the fins extending on the inner circumferential surface of the heat exchange cylinder on the outer circumferential surface of the baffle. In addition to suppressing the temperature near the burner outlet and baffle inlet, which were at high temperatures with the reeds, we also raised the temperature of the outer shell of the heat exchange cylinder, which is the outside of the baffle, where the temperature did not rise (in other words, improving the heat exchange efficiency in this area) ), and the temperature of the outer shell of the heat exchange cylinder can be equalized.

Thermal stress can be suppressed.

〔Example〕

Hereinafter, embodiments of the invention according to claim 1 will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a refrigerant heating device according to an embodiment of the present invention.

In the figure, reference numerals (1) to (81, (5a)) are the same components as those of the conventional device shown in FIG. 9, and their explanation will be omitted.

(21 is a hole drilled on the circumferential surface of the baffle (5), and FIG. 2 is a perspective view showing the baffle (5) in FIG. 1.

The operation of the refrigerant heating device configured as above will be explained.

The air sucked in from the air supply port (8) is sent to the burner (1).
It is mixed with fuel and becomes combustion gas. The combustion gas enters the heat exchange cylinder (2), but most of the combustion gas flowing here flows to the central part of the heat exchange cylinder (2) where the flow resistance is small, so the combustion gas flows inside the heat exchange cylinder (2). Once it enters the bottomed cylindrical baffle, it collides with the baffle bottom (5a). The repelled high-temperature combustion gas does not bounce back in a straight line, but as a thinly coiled turbulent flow, so most of the combustion gas is placed on the circumferential surface of the baffle. Multiple holes C! ■It is released from the baffle (5). However, the small amount of combustion gas that could not escape from the hole (2) goes out from the inlet side by crawling along the inner circumferential surface of the conventional baffle (5), and exits from the outer circumferential surface of the baffle (5). The fins (
4), it goes to the exhaust port (6) through the exhaust passage (7) provided between each of the baffles (5), but most of the high-temperature combustion gas flows through the round hole (A) provided on the circumference of the baffle (5). Since the amount of combustion gas is small, a new burner (1
) and push back the combustion gas that flows back out to the burner (1)
There is no speed left to allow the high temperature combustion gas to stagnate between the baffle (5) and the baffle (5).

In addition, the high-temperature combustion gas released from the round holes provided on the circumferential surface of the baffle (5) hits the fins (4) with force and moves toward the exhaust port (6) due to the force of the exhaust passage. However, since there are multiple round holes (A), the combustion gas is uniformly diffused and injected onto the outer circumferential surface of the baffle (5), and the fins (4) extended on the inner circumferential surface of the heat exchange cylinder (2) are used. It exchanges heat with the whole body very efficiently.

Taking the above into consideration, the outer temperature of the baffle (5) becomes as shown in Figure 8, and the temperature distribution is averaged over the whole, causing thermal stress that affects the durability of the heat exchange cylinder (2). This means that it has been suppressed.

FIG. 3 is a perspective view showing another embodiment of the baffle of the present invention, and although the hole drilled in the baffle (5) is a round hole (A), a square hole (20a) may also be provided in this hole. .

The operation in this case is almost the same as that of the above embodiment, but the turbulent combustion gas that bounced off the baffle bottom (5a) flows from the square hole (20a) to the fins on the outer circumferential surface of the baffle (5).
An added effect is that the air is cleanly rectified when discharged into the exhaust passage (7) provided between each of the above. Therefore, when flowing through the exhaust passage (7), the fins (4)
), this leads to an improvement in the apparent heat exchange rate with even less heat exchange loss, and the same effect as in the above embodiment is achieved.

Further, a refrigerant heating device which is an embodiment of the present invention according to claim 2 will be explained with reference to the drawings.

4 and 5 are longitudinal sectional views showing a refrigerant heating device according to an embodiment of the present invention.

In the same figure, symbols (1) to (81, (5a)) are the same components as those in the conventional device shown in FIG. 9, and their explanation will be omitted. This is an amplification adjustment plate attached to the top of the baffle (5) with a square cutout around the center.

The operation of the refrigerant heating device configured as above will be explained.

The air sucked in from the air supply port (8) is sent to the burner (1).
It is mixed with fuel and becomes combustion gas. The combustion gas enters the heat exchange cylinder (2), but most of the combustion gas flowing here flows to the central part of the heat exchange cylinder (2) where the flow resistance is small, so the combustion gas flows inside the heat exchange cylinder (2). Once it enters the bottomed cylindrical baffle (5), it collides with the baffle bottom (5a). And, the high-temperature combustion gas that was repelled had been flowing through the center until now.

Most of it flows in the circumferential direction inside the baffle (5), so the flow path is blocked by the amplification adjustment plate (to) provided on the inner circumferential surface of the baffle (5), and the flow path is again flowed to the bottom surface of the baffle (5a).
is pushed back in the direction of

Therefore, the high-temperature combustion gas continues to convect within the baffle (5), so that the inside of the baffle (5) gradually becomes filled with high-temperature combustion gas that has never been seen before. ), the heat exchange rate with the fins (4) extending on the inner peripheral surface of the heat exchange cylinder (2) is amplified.

In addition, the small amount of combustion gas that was not pushed back to the amplification adjustment plate (to) provided on the inner peripheral surface of the baffle (5).

The flow crosses the amplification adjustment plate (towards) and flows toward the center of the baffle (5), attempting to exit from the baffle (5) inlet, but the combustion gas newly sent in from burner +11 The force is stronger, so it flows again little by little, crawling along the inner peripheral surface of the baffle (5), passing through the exhaust passage (7), exchanging heat with the fins (4), and moving from the exhaust port to the air. leak.

Therefore, the airflow state of the combustion gas between the burner (1) outlet and the baffle (5) inlet is countercurrent with the supply gas and exhaust gas, but the central part of the heat exchange cylinder (2) This is because the air side and the outer periphery are separated from the exhaust side.

The stagnation of combustion gas during this period is eliminated.

Considering the above, the outer temperature of the baffle (5) should be as shown in Figure 8, and the temperature distribution will be averaged over the whole, which will affect the durability of the heat exchange cylinder (2). This means that thermal stress is suppressed.

FIG. 6 is a cross-sectional view in the longitudinal direction of the refrigerant heating device showing another embodiment of the present invention shown in FIG.

In the figure, (1) to (8) + (5a) are the same components as the refrigerant heating device shown in FIG. 9.

In the above embodiment, the plate provided on the baffle (5) was one perforated υ plate with square holes, but this plate was replaced with a spiral plate (A) along the inner peripheral surface of the baffle (5). You can also do this.

Next, the operation of another embodiment will be explained.

The combustion gas released from the outlet of the burner (1) flows through the center portion of the baffle (5) and collides with the baffle bottom surface (5a), as in the above embodiment. Thereafter, the flow becomes somewhat turbulent and bounces around, but since freshly sent combustion gas is always coming to the center, the old gas is swept away to the ends within the baffle (5). Therefore, the flow begins to flow toward the spiral plate (a) provided along the inner peripheral surface of the baffle (5), and instead of returning straight to the baffle (5) inlet, it flows around the spiral plate 60. Because it slides around and returns, the period of time it stays inside the baffle (5) is longer, 9 hours.

Furthermore, since the heat flows mainly through the inner circumferential surface of the baffle (5) rather than the central portion, the heat exchange rate transferred to the fins (4) on the outer circumferential surface of the high-layer baffle (5) is improved. Also.

While this flow is flowing through the spiral plate 6Q, a centrifugal force is applied near the baffle inlet, and the flow is forced out to prevent collision with newly incoming combustion gas.

〔Effect of the invention〕

As described above, according to the invention of claim 1.

I made a hole on the baffle circumference inside the heat exchange cylinder.

Thermal energy that was previously not used can be transferred to the fins, improving the heat exchange efficiency and making the outer shell temperature of the heat exchange cylinder uniform, thereby suppressing thermal stress.

This has the effect of extending the life of the heat exchange cylinder.

Still, according to this invention of claim 2, since the plate is provided in the cavity within the baffle, the flow of combustion gas can be controlled, and the heat exchange efficiency should be improved and the durability of the heat exchange cylinder should be maintained. effective.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a refrigerant heating device according to an embodiment of the present invention, FIG. 2 is a perspective view showing a baffle with a portion of the heat exchange tube cut away according to an embodiment of the invention, and FIG. 3 2 is a perspective view showing a baffle of another embodiment of the present invention, FIG. 4 is a longitudinal sectional view showing a refrigerant heating device showing another embodiment of the present invention, and FIG. 5 is a perspective view showing a baffle of another embodiment of the present invention. 6 is a longitudinal sectional view showing a refrigerant heating device according to another embodiment of the invention shown in FIG. 3, and FIG. 1 is a Y! 1-■ sectional view, FIG. 8 is a characteristic diagram of the outer shell temperature of the heat exchange cylinder of this invention, and FIG.
The figure is a longitudinal sectional view showing a conventional refrigerant heating device.
Figure 0 is a cross-sectional view of a conventional heat exchange cylinder in the circumferential and radial direction.
The figure is an external view showing the state in which the refrigerant pipes are installed, and FIG. 12 is a diagram showing the temperature characteristics of the outer shell of a conventional heat exchange cylinder. Note that (2) is a heat exchange tube, (3) is a refrigerant tube, and (4) is a fin. (5) is a baffle, (7) is an exhaust passage, ■ is a round hole, GO
is the amplification adjustment plate. In addition, in FIG. 9, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A heat exchange cylinder is provided with a refrigerant pipe on the outer peripheral surface and fins on the inner peripheral surface, and the combustion gas from the combustion section is guided into the heat exchange cylinder, and the heat exchange cylinder has a bottom. A cylindrical baffle is provided, and an exhaust passage for combustion gas introduced into the heat exchange cylinder is formed between the outer peripheral surface of the baffle and the inner peripheral surface of the heat exchange cylinder, and the refrigerant in the refrigerant pipe is discharged. A refrigerant heating device for heating, characterized in that a plurality of holes are provided on the outer peripheral surface of a baffle in the heat exchange cylinder. (2) A heat exchange cylinder is provided with a refrigerant pipe on the outer peripheral surface and fins on the inner peripheral surface, and the combustion gas from the combustion section is guided into the heat exchange cylinder, and the heat exchange cylinder has a bottom. A cylindrical baffle is provided, and an exhaust passage for combustion gas introduced into the heat exchange cylinder is formed between the outer peripheral surface of the baffle and the inner peripheral surface of the heat exchange cylinder, and the refrigerant in the refrigerant pipe is discharged. A refrigerant heating device for heating a refrigerant, characterized in that an amplification adjustment plate is provided on the inner peripheral surface of a baffle in the heat exchange cylinder.