JP2005069614A - Liquid heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize liquid combustion equipment of high efficiency and low emission excellent in durability by providing a method for executing primary heating by a burner and secondary heating by exhaust blowout as a means to heat liquid in a container. <P>SOLUTION: To realize high heat conductive capability by breaking a heat insulating air boundary film on a surface, the primary heating of a part of liquid heating surface provided in a liquid storing container for heating the liquid is executed by a mixed combustion burner and exhaustion gas of which temperature is slightly lowered is lead to around a secondary heating surface which is different from a primary heating surface and is blown out against the secondary heating surface from a blowout body having a number of small holes. Thermal durability around the blowout body and of the combustion equipment is improved and high efficiency and low emission property of the whole equipment are secured with a relatively simple structure. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a means for heating a liquid stored in a container, such as a hot water storage water heater, a storage water heater, a pot, a rice cooker, etc., in addition to direct heating by a gas burner or a burner that gasifies and burns oil. Further, the present invention relates to a technique for providing a liquid heating apparatus having extremely high heat utilization efficiency and good durability under a relatively simple configuration by effectively using the amount of heat contained in exhaust gas for heating.

  In conventional general liquid heating devices, there are first one that directly heats the pan bottom like a rice cooker and one that heats liquid using exhaust heat like a hot water storage water heater, and secondly a bath pot or Some instantaneous water heaters use a heat exchanger to increase thermal efficiency, but the former has low heat utilization efficiency and a lot of fuel waste, and the latter has complicated equipment and increased costs.

  In addition, a premixed forced combustion gas burner is used to provide a jet body with a large number of small holes downstream of the burner, and a high heat transfer effect is achieved by causing high-temperature combustion exhaust from the burner flame to jet and collide with the heated surface. In recent years, a method of using this for heating a liquid has been developed and publicly known. This method has high heat utilization efficiency and produces less harmful nitrogen oxides, so it is useful compared to the previous general heating method, but the high-temperature combustion exhaust from the burner flame is directly discharged from the jet body. In order to process, the temperature of the ejection body itself becomes very high, and the burner that receives the radiant heat from the ejection body has a high temperature, and there is a possibility of causing problems in the durability of each combustor component.

Although the example of the said apparatus which heats the said well-known liquid is enumerated, as a well-known example of the objective comparatively common with this invention, the following patent document exists, for example.
Japanese Unexamined Patent Publication No. 2000-257852 (Abstract, FIG. 1) JP 2002-39513 A (abstract, FIG. 1) JP 2003-52549 A (Abstract, FIG. 1)

  In order to solve the problems of the conventional technology and various liquid heating devices based on the conventional technology, the present invention is a highly efficient, durable and reliable liquid heating device with a relatively simple equipment configuration. It is intended to provide. Therefore, the liquid heating surface provided in the container for storing the object to be heated is first directly heated by the burner, and then the combustion exhaust whose temperature is slightly lowered is provided in a part of the bag-like exhaust reservoir. Effectively by destroying the heat-insulating air boundary film existing in the part of the ejector having a small hole so that the exhaust strikes at a substantially right angle toward the heating surface different from the primary heating by the burner of the container. An object of the present invention is to develop a liquid heating apparatus that is highly efficient, durable, reliable, and relatively inexpensive by applying exhaust heat to a liquid to be heated.

  In order to solve the above-mentioned problem, the invention of claim 1 is an apparatus for heating from a liquid heating surface provided in a container for storing a liquid to be heated by using gas fuel or fuel gasified from petroleum, The burner for burning the fuel is a so-called premixed combustion type burner in which most of the air necessary for combustion is mixed with the fuel in advance, and the heat generated by the combustion of the burner directly heats the surface to be heated where primary heating is performed first. Combustion device and heat transfer part are configured to obtain the effect. Exhaust gas whose temperature is slightly lowered by heating this surface is ejected from an ejection body provided with a large number of small ejection holes so that it can be ejected at a substantially right angle to the surface to be heated different from the primary heating. The present invention relates to a liquid heating apparatus characterized by secondarily heating a liquid.

  According to a second aspect of the present invention, the premixed combustion type burner is a surface combustion type gas burner represented by a ceramic burner so that the radiant heat from the burner can be effectively used for a surface to be heated for primary heating. The liquid heating apparatus according to claim 1, wherein the burner surface and the surface to be heated are opposed to each other at a relatively close position.

  In the invention of claim 3, the fuel is premixed with air by a blower and pushed into the burner, and the high-temperature exhaust gas after combustion heats the surface to be heated, which is subjected to primary heating, and then has sufficient pressure before being released to the outside air. 3. The liquid according to claim 1, wherein the liquid is ejected from the ejection port of the ejection body in a state where the liquid is held, and the heated surface different from the primary heating can be secondarily heated. It is about a heating device.

  The liquid heating apparatus of the present invention is implemented by the means described above, and has the effects described below.

  1. When heating the container containing the liquid, high-temperature heat from the flame of the burner is directly transmitted to the surface to be heated, including the radiant heat, to the surface to be heated, and heat is deprived by the heating of the surface to be heated. Exhaust with a slight drop in temperature is almost perpendicular to the heated surface that performs secondary heating from the many small holes provided in the ejector so that the heated surface separate from the primary heating is effectively secondary heated. As a result, the heat insulating air boundary film is destroyed and an extremely high heat transfer coefficient can be secured, so that the overall heating efficiency of the liquid is improved.

  2. Since the temperature of the high-temperature exhaust gas that has reached the ejection body has already decreased slightly compared with that generated in the burner portion, the durability of the ejection body and its surrounding constituent materials can be sufficiently ensured. Also, the temperature of the burner itself is lower than that of a known configuration in which a jet body is provided close to the burner and primary heating is performed, so the selectivity to the burner material is improved, and the durability and reliability of the device itself are improved. .

  3. Harmful because pre-mixed combustion does not involve excess air during combustion and less contact with outside air until the combustion exhaust gas is heated to a low temperature after being sufficiently heated and released to the outside air Generation of nitrogen oxides is suppressed, and a highly efficient and low pollution liquid heating apparatus can be provided.

  4). Since the heat transfer effect is high, it is not necessary to provide a complicated heat exchanger, so that the apparatus has a relatively simple configuration and can be implemented at a low cost.

  5). Combustion can be easily performed in response to the required performance of the apparatus because it can easily perform good combustibility and throttle combustion electronically in response to a signal from the sensor.

  6). Since the heated surface for performing secondary heating can be separated from the heated surface for performing primary heating, it is possible to obtain the best convection circulation heating in the liquid container, and it is also easy to prevent local heating. Therefore, it is possible to prevent bad phenomena such as bumping and deterioration of the liquid. In addition, it is easy to set a zone where it is not desired to cause liquid convection partially in the container as necessary.

  First, a part of the heated surface of the liquid storage container is primarily heated by using a surface combustion type or other short flame combustion type premixed combustion type burner using an air flow utilizing a blower or an exhaust draft. Subsequently, the exhaust with the temperature slightly lowered is led to the vicinity of the surface to be heated, which is separated from the primary heating while being blocked from the outside air, and is discharged from the ejector having a large number of small holes provided in the bag-like exhaust reservoir by the exhaust pressure. It blows so that it may contact this to-be-heated surface substantially at right angles, and after performing secondary heating, it discharge | releases to external air. With such a configuration, a liquid heating apparatus having many excellent performances shown in the section of the effect of the present invention has been realized.

  FIG. 1 is a cross-sectional view of an embodiment of the apparatus of the present invention, in which 1 is a liquid to be heated and stored in a container 2. The container 2 has a heated surface 4 on which primary heating is performed by combustion of the burner 3 and a heated surface 5 that is secondarily heated using exhaust heat. The fuel to the burner 3 is supplied from a fuel supply pipe 6 to an appropriate location between the blower 7 and the burner using fuel gas or pre-vaporized petroleum fuel, and mixed with the combustion air by the blower 7 to be mixed. It is conveyed to the burner via the supply pipe 8. The burner holder 9 for supporting the burner is hermetically connected to the air-fuel mixture supply pipe. The burner holder has a mesh or punching plate for improving the supply distribution of the mixed gas of fuel and air to the burner. It is desirable to provide the distribution plate 10. Further, the burner holder 9 is connected to the container 2 in a substantially airtight manner to prevent the combustion heat of the burner 3 from leaking to the outside.

  The combustion heat from the burner firstly heats the heated surface 4 directly to give heat to the liquid, but then the exhaust whose temperature has dropped slightly has been installed in a hermetic manner with the outside air downstream of the burner flame. Are ejected substantially perpendicularly to the heated surface 5 for performing secondary heating. With such a configuration, the heat remaining in the exhaust gas after the primary heating destroys the adiabatic air boundary film existing on the surface of the heated surface 5 even though the temperature is lower than that during the primary heating, and is good secondary Heat transfer heating can be performed to effectively heat the liquid, leading to securing the durability of the jet body and its surroundings.

  In FIG. 1, reference numeral 13 denotes an exhaust pipe for releasing the exhaust gas, which has been subjected to secondary heating and whose temperature has become low and has almost no heating capacity, to the outside air. 14 is an ignition device for the burner 3, and 15 is a sensor of a combustion safety device, which is operated by a normal electronic control device (not shown) together with a control function such as a fuel gas supply valve and an air volume control of the blower 7.

  Further, the cross section of FIG. 1 is a shape obtained by cutting the device in the vertical direction, but the shape of the cross section (not shown) of the device may be various shapes such as a circle, an ellipse, a rectangle, and a rectangle. Is not necessarily stored in the heated surface 5 forming the heat exchange part in the heated solution as shown in FIG. 1. For example, the exhaust after the primary heating can be used for heating from the outer periphery of the container 2. It is also possible to provide a jet body on the outer periphery. Further, the combustion flame of the burner is not limited to upward combustion upward, and can be downward, lateral, or the like. Therefore, the present invention has many embodiments within the scope of the concept.

FIG. 2 is a cross-sectional view showing another embodiment of the present invention, and shows a configuration method that is highly effective when applied to cooking of a rice cooker or the like. In the figure, the bottom of the hook is firstly heated directly by the combustion flame of the burner 3, and then the combustion exhaust is substantially from the small holes 11 of the jet body 12 provided in a part of the bag-like exhaust reservoir 16 to the outer wall of the hook. It is ejected at right angles and secondary heating is performed.
Exhaust gas having a low temperature after the secondary heating is collected in the exhaust cylinder 13 'and released to the outside air.
In the figure, reference numeral 17 denotes a heat insulating material for reducing heat radiation to the outside air of the bag-like exhaust reservoir 16.

  Here, the specific configuration form of the bag-like exhaust reservoir having the burner and the ejection body corresponds to the design of the apparatus depending on the shape of the liquid storage container, presence / absence of rotation, type of liquid to be heated, presence / absence of heating / non-heating zone, etc. If it is necessary to control the temperature of the liquid, it is possible to automatically control the heating amount to a predetermined value using an electronic control method or the like by a signal from a temperature sensor (not shown). .

  In each of the above embodiments, a mixed gas of fuel and air is forcibly sent to a burner using a blower and burned, and the exhaust for secondary heating is also introduced into the jet body as it is, and jetted from the jet outlet and heated. However, an embodiment in which a similar effect can be obtained without using a blower by extending the exhaust pipes 13 and 13 'upward to obtain a draft effect, for example, is also possible. It belongs to the concept.

  By providing the means of the present invention that can be effectively used to heat liquid by dividing the heat generated by combustion of the burner into primary heating and secondary heating, it can be applied to a wide range of uses for liquid heating of water, chemical solutions, oils and fats, etc. It can be applied to any industrial use such as industrial use, commercial use, home use, etc., and it is possible to realize a liquid heating apparatus that is low pollution, high energy saving, relatively inexpensive and highly reliable.

It is sectional drawing which showed the structural method of the liquid heating apparatus. (Example 1) It is sectional drawing which showed the structural method of the liquid heating apparatus. (Example 2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid to be heated 2 Container 3 Burner 4 Heated surface on which primary heating is performed 5 Heated surface to be secondarily heated 6 Fuel supply pipe 7 Blower 8 Mixture supply pipe 9 Burner holder 10 Distribution plate 11 Small hole 12 Spout Body 13, 13 'exhaust cylinder 14 ignition device 15 sensor 16 bag-shaped exhaust reservoir 17 heat insulating material

Claims (3)

  In a device for heating from a liquid heating surface provided in a container for storing a liquid to be heated using gas fuel or fuel gasified from petroleum, the burner for burning the fuel is a large part of the air required for combustion. The so-called premixed combustion burner is premixed with fuel and burned, and the heat generated by the combustion of this burner is first transferred to the combustion device so as to obtain a direct heating effect on the surface to be heated. Make up part. The exhaust from the burner whose temperature is slightly lowered by heating this surface is ejected from an ejection body provided with a large number of ejection holes so that it can be ejected substantially perpendicularly to the surface to be heated, which is different from the primary heating. A liquid heating apparatus, wherein the liquid inside is secondarily heated.   The premixed combustion type burner is a surface combustion type gas burner represented by a ceramic burner, and the burner surface and the main covered surface are used so that the radiant heat from the burner can be effectively used for the heated surface to be subjected to primary heating. The liquid heating apparatus according to claim 1, wherein the heating surfaces are disposed to face each other at a relatively close position.   The fuel is premixed with air by the blower and pushed into the burner, and the high-temperature exhaust after combustion heats the heated surface that performs primary heating, and then the ejector in a state with sufficient pressure before being released to the outside air The liquid heating apparatus according to claim 1, wherein the liquid heating apparatus is configured such that the surface to be heated can be secondarily heated by being ejected from the nozzle outlet.

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