KR920006609B1 - Forced blast type combustion device - Google Patents

Abstract

The combustor for preventing vibration combustion from pressure loss generated by small exhaust section, comprises a combusion case having an inner combustion chamber for performing high-calory combusion supported by supply of forced-air; exhaust section, for inducting exhaust gas from the chamber to the outside via heat exchanger, connected with the combusion case; pressuredischarging induction means for, discharging to the outside the pressure generated between the heat exchanger and the exhaust section, supported by exhaust flow.

Description

Forced Blowing Combustor

1 is a side sectional view showing an instantaneous gas water purifier to which an embodiment of the present invention is applied.

Figure 2 is a front sectional view showing the instantaneous gas water purifier to which the embodiment of the forced-blast combustion apparatus of the present invention is applied.

3 is a front view showing the instantaneous gas water purifier to which the embodiment of the present invention is applied.

4 is a perspective view of an exhaust plate mounted to an instantaneous gas water purifier to which an embodiment of the present invention is applied.

5 is a front view of the exhaust cover installed in the instantaneous gas water purifier to which the embodiment of the present invention is applied.

6 is a side cross-sectional view of FIG.

7 is a perspective view of a shield plate mounted on the instantaneous gas water purifier to which the embodiment of the present invention is applied.

8 is a longitudinal sectional view of main parts of another embodiment.

* Description of the main parts of the drawings

1: instant gas cooker 2: burner

4: exhaust part 5: plate

6: exhaust cover 20: combustion case

41: exhaust passage 41c: exhaust port

42: exhaust fan 100: perforation

101a: drawway S: euro space

The present invention relates to a forced blow type combustion device which is easy to generate pressure loss by reducing the exhaust portion to reduce noise during operation. In particular, the present invention relates to a forced blow type combustion device that is improved to suppress vibration combustion caused by pressure loss. It is about.

Background Art [0002] In a recent forced blow-type combustion device, for example, an instant hot water dispenser, air and fuel gas are forcibly supplied by a blower to burn high loads in a combustion chamber, and water can be heated by hot water through a heat exchanger.

Then, the combustion gas of the combustion chamber passes through the heat exchanger and is then discharged to the outside from the exhaust portion as exhaust gas.

In this case, because of the high load combustion in the combustion chamber, combustion noise is likely to occur, and in order to reduce the combustion noise, the exhaust portion is bent in a yellow shape, the passage size thereof is increased, or the suction member is disposed in the exhaust portion to reduce noise. Effect was achieved.

However, in the above configuration, the combustion noise can be suppressed, but the flow resistance of the exhaust flow in the exhaust portion is increased, resulting in the following irrational points.

In other words, the pressure vibration and the combustion reaction resonate with the combustion in the combustion chamber, resulting in the noise generated by the vibration noise.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a forced blow type combustion apparatus capable of effectively suppressing the generation of noise due to vibrational combustion without interfering with lowering of combustion noise.

In order to achieve the object of the present invention, a combustion case in which a combustion chamber is forcedly supplied and high load combustion is formed therein and connected to the combustion case to induce exhaust gas from the combustion chamber to the outside through a heat exchanger. A forced blow combustion apparatus comprising an exhaust section and a discharge inducing means for guiding the pressure generated between the heat exchanger and the exhaust section to the outside by an airflow of the exhaust gas generated in the combustion operation. Is provided.

According to the present invention, by providing means such as a base and a sound absorbing member, it is possible to effectively suppress the occurrence of vibrational combustion by discharging the pressure increase in the exhaust portion to the outside as a discharge inducing means while reducing combustion noise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 3 show the instantaneous gas scrubber to which the forced blowing combustion apparatus of the present invention is applied.

In this embodiment, a forced blowing combustion apparatus is applied to the instantaneous gas scrubber 1.

The instantaneous gas water purifier 1 is housed in the body case 10 and is a centrifugal blower 7 which is a supply part for supplying the combustion part 2, the heat exchange part 3, and the combustion air to the combustion part 2. And a gas supply path 8 and an electronic controller 9.

The body case 10 has an open hole 11 for sucking combustion air and a open hole 12 for discharging combustion exhaust air.

The combustion unit 2 is composed of a combustion case 20 having an exhaust unit 4 formed thereon, and a ceramic combustion unit having a plurality of ejection holes formed in a ceramic plate body attached to the combustion case 20 through a fixture 21. It consists of the combustion chamber 23 provided with the plate-type gas burner 22, and the mixing chamber 24 formed in the lower part of this combustion chamber 23. As shown in FIG.

The heat exchanger (3) is composed of a plate fin group 31, a water supply pipe (32) and a hot water supply pipe (33) to increase the heat exchange efficiency, and is disposed between the gas burner (22) and the exhaust (4) outside the water supply pipe (32). The water sent from upstream of the heat exchanger is exchanged with the combustion exhaust in the combustion chamber 23.

The exhaust portion 4 has an exhaust passage 41 formed therein with an inlet portion 41a, a bent portion 41b and a rectangular exhaust port 41c open outward as shown in FIGS. It consists of an exhaust fan 42 and an exhaust hood 6.

The exhaust fan 42 is attached to the upper portion of the combustion case 20, as shown in FIG. 4, the rectangular hole 43a is opened, and a rhombic protective metal mesh 43b is provided around it. The sound absorbing material 43c is formed in the lower part 42a.

In addition, the exhaust fan 42 includes support frames 44-46 for supporting sound absorbing materials 43d and 43e having a small opening area of the exhaust port 41c of the exhaust passage 41 opened on the side, and an upper portion thereof. The ceiling plate 47, the upper plate 48, etc. which support the sound absorption material 43f formed in 42b are provided.

In this state, the support frame 45 protrudes into the exhaust passage 41 and is positioned substantially orthogonal to the flow direction of the exhaust gas stream as described in the following description of the operation of the present invention, so as to absorb sound of the sound absorbing material 43d. It is supposed to be effective.

The support frame 44 has an opening hole 44a provided to form an exhaust port 41c of the exhaust passage 41, and an inner circumferential edge 44b formed on the inner circumferential surface of the opening hole 44a. It extends in the direction which makes the opening area of the exhaust port 41c of the exhaust passage 41 small at the edge 44c of 44b.

In the support frame 45 and the ceiling plate 47, a plurality of through-holes in a circular shape are drilled to expose the sound absorbing materials 43d and 43f to the exhaust passage 41.

The side of the support frame 44 is provided with a release inducing means for inducing the pressure in the flow path space (S) to the outside to prevent the pressure loss and the resulting vibration combustion.

The discharge inducing means is constituted by a pressure equalizing pipe 101 which communicates and opens the flow path space S to the outside.

The exhaust hood 6 covers the exhaust port 41c of the exhaust passage 41 and is attached to the outer periphery 44h of the support frame 44 as shown in FIGS. 5 and 6, and on the left and right sides. Toe-shaped exhaust ports 65a and 65b and the same shape of exhaust ports 65c and 65d are formed in two stages above and below.

In the exhaust hood 6, the equalization hole 200 is formed in the proximal state below the exhaust port 65b, and is arranged up and down side by side with the other exhaust port 65a.

By the way, the through hole 100 is formed in the end 44e of the support frame 44 so as to communicate with the flow path space S between the support frame 45 and the heat exchanger 3.

The equalizing pipe 101 is bent in a crank form, which acts as a discharge inducing means, which is the subject of the present invention, and has an internal draw passage 101a.

The equalization pipe 101 communicates one end with the through hole 100 and the other end with the equalization hole 200 in the exhaust hood 6. 67 is an attachment hole, through which the exhaust hood 6 is fastened to the support frame 44 with a screw or the like.

The centrifugal blower 7 is composed of a scroll casing 71, a fan 72, and a motor 73 for driving the fan 72.

The scroll casing 71 has a spiral winding shape, which covers the body 75 fastened to the side surface 74, the shield plate 76 fastened to the body 75, and the shield plate 76. It consists of a dustproof net (Net: 77).

The ordinary body 75 forms a bellows-shaped suction port 78 that extends to the outside, and the front end portion 79 is inserted into the fan 72 by a soaking size considering the rotational speed of the centrifugal blower 7.

The shielding plate 76 has a conical portion 76b in which the tip 76a is located at the center of the bellows-shaped inlet 78 as shown in FIG. 7 and is provided on the outer circumferential side at the other end 76c of the conical portion 76b. 76 d of extension-mounted original pipe parts, three L-shaped attachment leg parts 76e extended by this disc part 76d, and three L-shaped translation net attachment parts 76f which protruded from the disc part 76d. It becomes

Since the L-shaped attaching leg portion 76e is extended from the three L-shaped dustproof net attaching portions 76f to the outer circumferential side, the shield tube 76 and the dustproof net 77 are assembled in advance, and then the ordinary body 75 ) Can be attached.

The gas supply passage 8 is integrally formed together with the scroll casing 71 and has a gas ejection nozzle 81 for ejecting fuel gas, and a gas supply pipe 82 for supplying fuel gas to the gas ejection nozzle 81. And a gas control unit 83.

The gas control unit 83 is provided between the gas ejection nozzle 81 and the gas supply pipe 82, and is provided on the electronic open / close side 84 which opens and closes by energization and non-energization, and downstream of the open / close side 84. And a positive pressure valve (not shown) for adjusting the gas flow rate and an electronic proportional control valve 85 installed downstream of the positive pressure valve, the opening ratio being varied according to the amount of energization.

At the other end of the gas ejection nozzle 81, an orifice 86 for adjusting the supply pressure and the flow rate of the fuel gas is attached.

The electronic control device 9 is a start switch (not shown) which is turned on when using the instantaneous gas water purifier 1, a temperature adjusting knob (not shown) which is operated by a user to set the water temperature flowing out of the hot water heater 33. And a spike electrode 92 which bounces a flame from the combustion surface of the gas burner 22 at the time of ignition in accordance with an input of a thermocouple 91 for detecting the oxygen supply state of the flame of the gas burner 22, Control is made to energize or de-energize the motor 73 for driving the centrifugal blower 7, the gas control unit 83, and the like.

Next, the operation of the above configuration will be described.

When the start switch is turned ON, the instantaneous gas water purifier 1 rotates the fan 72 of the centrifugal blower 7, and supplies the combustion air to the gas burner 22 from the scroll casing 71. The electronic controller 9 outputs to the open / close side 84 and the proportional control side 85 of the gas control unit 83 to open the open / close side 84 and the proportional control side 85. The combustion air outside the scroll casing 71 is removed by the dustproof net 77 to suck the flow rate of the combustion air into the ordinary body 75. Then, spark discharge is generated at the spark electrode 92 by the electronic controller 9 so that the gas burner 22 is ignited to start combustion. The combustion exhaust of the gas burner 22 then passes through the heat exchanger 3 as an exhaust stream and reaches the inlet portion 41 of the exhaust section 4.

In this process, water from the water supply pipe 32 is heat-exchanged with the exhaust stream by the heat exchanger 3, and is supplied from the hot water supply pipe 33 as hot water.

The exhaust stream then comes out of the exhaust port 41c through the hole 43a of the sound absorbing material 43 and is then discharged from the exhaust ports 65a, 65b, 65c and 65d of the exhaust hood 6.

At this time, the exhaust passage 41 is narrowed by the sound absorbing material 43f, and the support frame 45 of the sound absorbing material 43d becomes a large flow path resistance of the exhaust flow in the state of protruding. Since the pipe 101 is provided, the flow path space S is released to the outside through the outflow path 101a of the equalizing pipe 101.

Therefore, the pressure in the flow path space S between the support frame 45 and the heat exchanger 3 cannot be increased by itself, so that the generation of combustion vibration is effectively suppressed and there is no resonance caused by the combustion vibration.

As described above, the present invention has the effect of effectively suppressing the occurrence of combustion vibration by preventing the pressure loss even though the sound absorbing pad is formed in the exhaust part 4 to reduce the combustion noise as described above. In addition, by forming the equalization hole 200 in close proximity to the exhaust port 65b, the equalization hole 200 is arranged side by side in the up and down direction with the exhaust port 65b inherently present, and the appearance of the design is beautiful. There is also an effect.

In addition, although the sound absorption material 43c was formed in the said Example, this may be provided as needed or may be omitted.

Instead of the crank equalizing pipe 101, a linear equalizing pipe may be provided in the exhaust hood 6 in a penetrating state.

In addition, the pressure equalizing pipe 101 may be omitted by only the through hole 100 or the perforation 100 may be configured to communicate with the exhaust ports 65a through 65d through the space between the support frame 44 and the exhaust hood 6. .

Next, another embodiment of the present invention will be described with reference to FIG.

In this embodiment, instead of the through hole 100 and the equalizing pipe 101 of the above embodiment, the support frame 44 is formed while the through hole 100 having a diameter of about 5 mm is formed on both sides of the support frame 44. ) And the exhaust hood 6 are provided with a partition plate 300 to block the opening 44a and the through hole 100 by the partition plate 300.

The interior of the exhaust hood 6 communicates with the passage space S between the sound absorbing material 43 and the heat exchange part 3 by the through hole 100.

In the exhaust hood 6, an exhaust escape hole 400 is formed, through which the flow path space S communicates with the outside through the interior of the through hole 100 and the cover 6.

According to this configuration, in addition to obtaining the same effects as in the first embodiment, the passages through which the flow path space S, the perforation 100 and the exit hole 400 communicate with each other are provided to the exhaust flow through the opening 44a. Because it is not disturbed, a good low noise effect is obtained.

In other embodiments, the forced blow-type combustion apparatus of the present invention may be applied to a heating apparatus, and various modifications can be made without departing from the scope of the present invention.

Claims (2)

A combustion case formed therein with a combustion chamber forcibly supplied with combustion air to perform high load combustion, an exhaust portion connected to the combustion case for guiding exhaust from the combustion chamber to the outside through a heat exchanger, and And a discharge inducing means for releasing the pressure generated between the heat exchanger and the exhaust part to the outside by the exhaust flow to the outside. The forced-blast combustion apparatus according to claim 1, wherein the discharge inducing means is an induction furnace for interlocking the exhaust portion and the outside.

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