JPWO2007046468A1 - Combustion device using small vaporizer - Google Patents

Abstract

In a combustion apparatus using liquefied gas as a fuel, a small vaporizer capable of stably supplying gaseous liquefied gas to the combustion apparatus regardless of the inclination of the liquefied gas cylinder, and a combustion apparatus using the same. The combustion apparatus includes a supply pipe (2) disposed between a liquefied gas cylinder (1) and a combustion device (B) having a combustion unit, and the supply pipe includes heat from the combustion unit of the combustion device. A vaporizer (E) for vaporizing the liquefied gas so as to be higher than the temperature of the liquefied gas cylinder by transmission, and a pressure regulator (P) downstream of the vaporizer for adjusting the pressure of the vaporized gas. A check valve (V) is provided upstream of the vaporizer to prevent the excessive liquefied gas from flowing into the vaporizer.

Description

  The present invention relates to a combustion apparatus using a small vaporizer used in combustion equipment using liquefied gas as fuel.

  Since the liquefied gas does not have a very high vapor pressure at room temperature and generates a large amount of heat per weight, it is used as a fuel for small-sized combustion equipment such as portable heaters and portable flame torches. When combusting liquefied gas with such a combustion device, it is ejected as a vaporized gas from the nozzle of the combustion device, and air is mixed at a constant rate to create an air-fuel mixture, which is burned in the combustion section connected to the nozzle. . Therefore, combustion cannot be maintained unless such an air-fuel mixture is supplied to the combustion section.

  On the other hand, since the combustion device is portable, the combustion device is combusted in various orientations or angles, and the liquefied gas cylinder is tilted accordingly and inverted. As a result, the liquefied gas may reach the nozzle while being in a liquid state and may be ejected from the nozzle. If this happens, the mixture ratio of the sucked air and gas is greatly changed, the air-fuel mixture becomes too thick and incomplete combustion occurs, and therefore normal combustion cannot be maintained.

  In order to solve such a problem, it is known to fill a liquefied gas cylinder with a porous material and adsorb the liquefied gas thereto. According to this, since the liquefied gas flows out of the cylinder by the capillary action of the porous material, the liquefied gas does not flow out in a liquid state regardless of the attitude of the cylinder.

  However, due to the filling of the porous material, the amount of the liquefied gas to be filled in the cylinder is reduced accordingly, and the manufacturing cost of the cylinder is increased. Therefore, in order to improve these points, vaporizers shown in the following patent documents are already known.

  Citations 1 and 2 disclose measures for preventing the combustion apparatus from reaching the nozzle of the combustion apparatus as it is when the gas cylinder is tilted or inverted and used for a long time. The apparatus disclosed in the cited document 1 is provided with a vaporization chamber between the liquefied gas cylinder and the combustion device, and a part of the gas supply pipe leading from the vaporization chamber to the nozzle of the combustion device is faced to the front of the combustion unit. The liquid gas in the gas supply pipe is vaporized by heating. The apparatus disclosed in Patent Document 2 is such that the gas supply pipe reaches directly from the liquefied gas cylinder to the nozzle of the combustion device, and a part of the gas supply pipe faces the combustion section in the same manner as in Patent Document 1, The portion is directly roasted with a flame, and the liquid gas in the gas supply pipe is vaporized by heating. In any case, it is excellent in that only the gas vaporized from the nozzle of the combustion device is always ejected, but there is a drawback that the structure becomes complicated such as providing a gas supply pipe for heating.

Japanese Utility Model Publication No. 5-47936 Japanese Utility Model Publication No. 6-16267

The object of the present invention is to provide the gas vaporized in the nozzle of the combustion equipment regardless of the angle of use of the gas combustion equipment or the liquefied gas cylinder without providing the gas supply pipe necessary for heating the liquefied gas as described above. It is an object of the present invention to provide a combustion apparatus using a small vaporizer that can continue to be supplied at a stable pressure.

The object of the present invention is to provide a supply pipe disposed between a liquefied gas cylinder and a combustion device having a combustion unit, and liquefaction by heat transfer from the combustion unit of the combustion device disposed in the supply pipe. A vaporizer for vaporizing the liquefied gas so as to be higher than the temperature of the gas cylinder, a pressure regulator downstream of the vaporizer for adjusting the pressure of the vaporized gas, and upstream of the vaporizer, This is accomplished by providing a combustion device having a check valve provided in the supply pipe to prevent excessive liquefied gas from entering the vaporizer.

  According to the present invention, the vaporizer and the check valve are preferably composed of a single unit, but may be separate from each other. The carburetor has a carburetor body that is provided in thermal contact with the combustion section so that heat is transferred from the combustion section of the combustion device, and the carburetor body vaporizes the liquefied gas by the heat. And a housing having an inlet portion and an outlet portion disposed therein, wherein the check valve includes a valve seat including an O-ring provided at the inlet portion of the housing, and a valve seat. It consists of a ball valve for opening and closing the inlet portion by being seated or separated and a coil spring for biasing the ball valve toward the valve seat.

(Function)
According to the present invention, the liquid gas in the liquefied gas cylinder is supplied to the carburetor through the supply pipe through the check valve, and the heat of the combustion part of the combustion equipment is transmitted to the carburetor in a steady state. Since the temperature is always higher than that of the liquefied gas cylinder, the liquid gas retained in the vaporizing chamber of the vaporizer is vaporized. In this state, the vapor pressure of the liquefied gas also becomes higher in the vaporizer, the valve is closed by the function of the check valve, and there is no back flow from the vaporizer to the liquefied gas cylinder. The vaporizer plays the role of the second cylinder, and continues to supply the gas vaporized through the nozzle to the combustion section. When the pressure drops below, the check valve is opened and the liquid liquefied gas is supplied into the vaporizer, and vaporization is performed again. By repeating this, the liquid liquefied gas can be vaporized and supplied to the combustion equipment. Furthermore, the pressure regulator can prevent the pressure of the gas vaporized in the vaporizer from pulsating, and can stably burn the gas.

  Hereinafter, the principle of the combustion apparatus according to the present invention will be described with reference to FIG. In the figure, 1 is a liquefied gas cylinder, 1A is its discharge port, 2 is a supply pipe from the cylinder to the combustion equipment B, E is provided in the supply pipe downstream of the cylinder, and incorporates a check valve V shown in FIG. It is a vaporizer and is disposed in thermal contact with the combustion device B so that the heat H of the combustion device is transmitted. P is a pressure regulator provided in the supply pipe between the vaporizer E and the combustion equipment B. The check valve V may be a separate valve that is not built in the vaporizer.

  FIG. 3 is a view showing details of the carburetor E used in the combustion apparatus of the present invention, and the carburetor E is connected to the supply pipe 2 downstream of the cylinder and includes a vaporizing chamber 6A therein. A carburetor body 6 comprising: The check valve V is disposed inside the housing and is disposed and secured to the inlet portion 2B of the vaporizing chamber of the housing. The check valve V is composed of an O-ring 7, a ball valve 8, and the ball valve 8 is always attached. A coil spring 9 for pressing against the O-ring. An end portion 2C on the combustion equipment side of the supply pipe extends into the vaporizing chamber 6A of the housing to constitute an outlet portion. With this configuration, the liquid liquefied gas can be temporarily retained in the vaporization chamber so that it does not flow directly from the end portion 2C.

  In this example, the check valve V is incorporated into the carburetor E to form a single unit. Therefore, the overall structure is made compact and the handling is improved, but the check valve V and the carburetor E are separately provided. The same function can be achieved even if it is constructed on the body.

  Similarly to the above embodiment, the vaporizer E may be formed by forming a part of the supply pipe 2 in a coil shape or on a bellows in order to retain the liquid liquefied gas therein.

  First, when starting, when the gas cylinder valve is opened, the gaseous liquefied gas reaches the check valve V from the gas cylinder through the supply pipe, and the check valve is opened by the pressure of the gaseous liquefied gas. Then, it reaches the nozzle of the combustion device through the pressure regulator P, and is ignited by an igniter (not shown) in the combustion section. After a while, the combustion section is heated by the flame itself, and the heat is transmitted to the vaporizer. If the gas cylinder is inclined for some reason at this time, the liquid liquefied gas supplied from the liquefied gas cylinder through the supply pipe 2 to the vaporizing chamber 6A of the vaporizer E has a certain internal volume in the vaporizing chamber 6A of the vaporizer E. It stays here temporarily. Then, the liquid liquefied gas is vaporized by the heat H transmitted from the heating unit. The temperature required for vaporization depends on the conditions to be used, but it may be about 10 ° C. to several tens of degrees C., usually about 20 to 30 ° C. higher than the gas cylinder. Therefore, it is not necessary to be aware of the orientation of the liquefied gas cylinder 1. However, particularly in starting at a low temperature, the discharge port 1A of the liquefied gas cylinder 1 needs to be temporarily upward. If the vaporizer E cannot operate upward, it is preferable that the temperature of the vaporizer E is always high during operation.

When the liquefied gas starts to vaporize in the vaporizing chamber 6A of the vaporizer E, the vapor pressure of the liquefied gas becomes higher on the vaporizer E side, so the check valve V is closed and the backflow from the vaporizer E to the liquefied gas cylinder 1 is prevented. Is done. At this time, the vaporizer E plays the role of a second gas cylinder and continues to supply gas to the combustion equipment. However, when all of the liquid liquefied gas in the vaporization chamber 6A of the vaporizer E is vaporized, the internal vapor When the pressure decreases and becomes equal to or lower than the vapor pressure of the liquefied gas cylinder 1, the check valve V opens again. When the liquid liquefied gas flows into the vaporizer E, the internal vapor pressure rapidly rises and the check valve closes. By repeating this, the liquid liquefied gas can be forcibly vaporized. In this state, pulsation occurs in the pressure of the vaporized gas, the gas pressure to the gas nozzle 3 fluctuates, and thereby the gas discharge amount fluctuates. The pressure regulator P disposed between the carburetor E and the combustion equipment unit can smooth such pressure fluctuations. That is, a regulated gas having a constant pressure can be supplied to the combustor side (secondary side), and the pressure on the secondary side can be arbitrarily changed by the knob P ′ of the pressure regulator P, whereby the gas nozzle The gas ejection amount from 3 can be changed.

  FIG. 2 shows an embodiment in which the combustion apparatus according to the present invention is applied to a torch type burner. The burner has a burner body D that is a combustion device that is attached to a liquefied gas cylinder. A supply pipe 2 extends between the cylinder and the burner, and a vaporizer E and a pressure regulator P are arranged in the supply pipe 2. The vaporizer E is attached in contact with the burner body so that the heat from the burner body D is directly transmitted, and the pressure regulator P is attached to the burner body D with an interval so that the heat from the burner body D is not transmitted so much. Yes. The burner body D includes a gas passage 10 that is connected to the supply pipe 2 and reaches the combustion portion, that is, the burner portion 11, and a gas nozzle 3 provided in the gas passage. When gas is ejected from the gas nozzle 3, air is sucked from an intake hole 4 provided in communication with the atmosphere in the burner body to create an air-fuel mixture, and a flame 5 is formed in the burner portion 11 when ignited. G in the figure indicates the direction in which the gas vaporized in the passage 10 travels.

  The vaporizer E is preferably installed at the location of the main body where the vaporizer main body 6 is heated to about 50 ° C. to 60 ° C., LPG is sufficiently vaporized at this temperature, and the internal rubber made of rubber is used. The O-ring 7 is not damaged.

  When the burner body or the liquefied gas cylinder 1 is tilted, the liquid liquefied gas passes through the supply pipe 2 and reaches the inlet of the vaporizer E. As described above, when the pressure in the vaporizer E decreases and the pressure difference from the pressure in the liquefied gas cylinder 1 slightly exceeds the force that pushes the ball valve 8, the liquid liquefied gas is supplied to the vaporizing chamber 6A. Since the vaporizer E is already heated and the liquid liquefied gas is immediately vaporized and becomes higher than the internal pressure of the liquefied gas cylinder 1, the ball valve 8 is closed and the inflow of the liquid liquefied gas is stopped.

  Although this example is an example of a torch type gas burner called a Pian burner, the burner 11 is provided with a conical flame 5 and a sleeve flame 12 at its skirt, so that the conical flame 5 is maintained at any inclination. be able to. By mounting the carburetor E of the present invention on such a combustion apparatus, the combustion apparatus can be used freely without worrying about the inclination or angle of the liquefied gas cylinder 1.

  Since the torch type gas burner shown in the above example is frequently ignited and extinguished frequently for its intended purpose, the carburetor may become below a predetermined temperature after a while after extinguishing. In such a state, when the gas burner is used after re-igniting, there is an inconvenience that the tilting cannot be used until the vaporizer reaches a predetermined temperature. In order to eliminate this point, it is preferable to keep the heat storage body in close contact with the vaporizer body 6. As a result, since heat is supplied from the heat storage body even during digestion, the temperature does not drop immediately, and it can be used by tilting immediately after re-ignition. As the heat accumulator, a metal such as copper having a large heat capacity, or a material using, for example, wax or low melting point plastic that uses latent heat at the time of phase change of a substance when it is desired to reduce the weight can be used.

  In addition, since the vaporizer exhibits the vaporization function of the liquefied gas when it reaches the predetermined temperature due to the heat of combustion, the color changes at the predetermined temperature so that the user can visually confirm this temperature from the outside. It is convenient to put a sticker using liquid crystal on which characters are raised on the vaporizer body 6. Such a seal is particularly effective in a torch type gas burner or the like, but can also be applied to other combustion apparatuses.

FIG. 4 shows a portable heat transfer device which is another embodiment to which the combustion device according to the present invention is applied.

The portable heat transfer device T includes a liquefied gas cylinder 1 inside, and further includes an air-fuel mixture generating unit 13 having a gas nozzle, an air suction ejector, and a tube for mixing gas and air, and a combustion unit 14 that burns the air-fuel mixture. And a liquid circulator 15 that transmits this heat to the liquid W and circulates it to the external heat load L through the flexible piping 16, and is used by wearing it in cold clothes or laps because it is small and lightweight. To do.

Since the apparatus used for such an application is inevitably used in a state inclined in various directions, it can be said that there is a high risk that the liquid liquefied gas in the liquefied gas cylinder is supplied to the gas nozzle as it is. In order to prevent this, in this embodiment, the vaporizer E is installed in the vicinity of the combustion unit 14 of the combustion equipment, and further, a pressure having a knob P ′ for adjusting the pressure between the vaporizer E and the combustion unit 14. An adjuster P is provided, and a gaseous liquefied gas having a constant pressure is supplied to the gas nozzle through the air-fuel mixture generating unit 13. In the figure, reference numeral 17 denotes a heat insulating layer that prevents heat from the combustion section 14 from being directly transferred to the LPG cylinder 1. Thus, it is preferable to always keep the liquefied gas cylinder 1 at a lower temperature than the vaporizer E. In addition, the combustion part 14 used for this example can use the thing of a flame combustion system or a catalyst combustion system.

It is the schematic which shows the principle of the combustion apparatus of this invention. It is a partial cross section side view which shows embodiment which applied the principle of the combustion apparatus of this invention to the torch type burner. It is sectional drawing of the vaporizer | carburetor used for the combustion apparatus of this invention. It is the schematic of embodiment which applied the combustion apparatus of this invention to the portable heat transfer apparatus.

Explanation of symbols

V check valve E vaporizer B combustion equipment P pressure regulator 1 liquefied gas cylinder 2 supply pipe 3 nozzle D burner body 11 burner part or combustion part 14 combustion part
T Portable heat transfer device L External heat load 7 O-ring 8 Ball valve 9 Spring

Claims (4)

A supply pipe disposed between the liquefied gas cylinder and the combustion equipment having the combustion section, and the temperature of the liquefied gas cylinder disposed in the supply pipe by heat transfer from the combustion section of the combustion equipment A vaporizer for vaporizing the liquefied gas, a pressure regulator downstream of the vaporizer for adjusting the pressure of the vaporized gas, and a vaporizer provided in the supply pipe upstream of the vaporizer And a check valve for preventing an excessive flow of liquefied gas into the vessel.   The combustion apparatus according to claim 1, wherein the check valve and the vaporizer are of a single unit.   The combustion apparatus according to claim 1, wherein the vaporizer and the check valve are separately provided.   The carburetor has a carburetor body that is provided in thermal contact with the combustion section so that heat is transferred from the combustion section of the combustion equipment, and the carburetor body vaporizes the liquefied gas by the heat. A non-return valve comprising a housing having an inlet portion and an outlet portion located therein, the check valve comprising an O-ring provided at the inlet portion of the housing, and a valve seat The combustion apparatus according to claim 1 or 2, comprising a ball valve for opening and closing the inlet portion by being seated or separated and a coil spring for biasing the ball valve toward the valve seat.

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