WO2012101755A1 - Mixed gas production device - Google Patents

Mixed gas production device Download PDF

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Publication number
WO2012101755A1
WO2012101755A1 PCT/JP2011/051287 JP2011051287W WO2012101755A1 WO 2012101755 A1 WO2012101755 A1 WO 2012101755A1 JP 2011051287 W JP2011051287 W JP 2011051287W WO 2012101755 A1 WO2012101755 A1 WO 2012101755A1
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WO
WIPO (PCT)
Prior art keywords
mixed gas
gas
raw material
combustion air
silencer
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PCT/JP2011/051287
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French (fr)
Japanese (ja)
Inventor
明広 平山
稔也 神宝
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伊藤工機株式会社
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Application filed by 伊藤工機株式会社 filed Critical 伊藤工機株式会社
Priority to JP2012554529A priority Critical patent/JP5762443B2/en
Priority to EP11856770.0A priority patent/EP2668998A4/en
Priority to PCT/JP2011/051287 priority patent/WO2012101755A1/en
Priority to CN2011800651492A priority patent/CN103313778A/en
Publication of WO2012101755A1 publication Critical patent/WO2012101755A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F23D14/64—Mixing devices; Mixing tubes with injectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/10—Mixing gases with gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3124—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow
    • B01F25/31242—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow the main flow being injected in the central area of the venturi, creating an aspiration in the circumferential part of the conduit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2210/00—Noise abatement

Definitions

  • the present invention is used when a mixed gas is produced by injecting a raw material gas into a throat from a nozzle of a venturi mixer, sucking combustion air by the negative pressure accompanying this injection, and mixing the raw material gas and the combustion air.
  • the present invention relates to a mixed gas manufacturing apparatus in which a silencer for reducing noise associated with the mixing is provided in a gas flow path.
  • the mixed gas manufacturing apparatus includes a raw material gas tank, an air compressor, and the like.
  • the raw material gas (propane or the like) supplied from the raw material gas tank is mixed with combustion air. It is a device for supplying to users such as general households.
  • This apparatus is used especially when a disaster such as an earthquake occurs or when the supply of city gas is temporarily stopped during night construction, and the mixed gas is used as a city gas (12A, 13A) that is normally used by a user.
  • Etc.) is adjusted so as to match the fuel calorie (adjustment of the mixing ratio of the raw material gas and the combustion air).
  • a venturi mixer shown in Patent Document 1 is generally used.
  • This Venturi mixer feeds the raw material gas injected from the nozzle into a throat having a constricted part in the middle of the gas flow path, and when this raw material gas passes through the constricted part, it is used for combustion by the negative pressure generated around it. Air is sucked and this raw material gas and combustion air are mixed.
  • the mixing ratio of the raw material gas and the combustion air can be appropriately changed by changing the shape of the throttle portion of the throat, the injection pressure of the raw material gas, and the like.
  • Patent Document 2 adopts the following configuration in order to reduce noise caused by the mixing (2). That is, a hole for introducing a raw material gas is provided in the throttle member (throttle part) of the throat, and a separation member is provided upstream of the hole so that the flow of combustion air supplied from the upstream side of the throat The flow of the raw material gas that is guided to the center side and is supplied from the hole does not directly cross the flow of the combustion air (in particular, refer to FIG. 2 of Patent Document 2). By adopting this configuration, the degree of collision of both airflows when mixing the raw material gas and the combustion air is reduced, and noise associated with this mixing is reduced.
  • the noise related to the mixing of the raw material gas and the combustion air in (2) can be reduced, but the noise in (1) may be increased. This is because by providing the peeling member, the flow cross-sectional area of the portion is partially reduced, and the change in flow velocity when the combustion air passes through the portion is likely to increase. For this reason, there is a problem that noise reduction is not very efficient in total.
  • the combustion air flows a little away from the source gas supply hole, so that the source gas suction action in the throat tends to be insufficient.
  • measures such as increasing the gas pressure of the raw material gas may be required.
  • an object of the present invention is to reduce noise during operation of the apparatus without impairing the mixed gas production function of the venturi mixer.
  • the present invention mixes a raw material gas supply means, an air supply means, a raw material gas supplied from the raw material gas supply means, and combustion air supplied from the air supply means.
  • a mixed gas production apparatus was constituted by a venturi mixer and a muffler provided on the mixed gas outlet side of the venturi mixer to reduce noise caused by the mixing.
  • the formation of the negative pressure accompanying the flow of the raw material gas is not hindered by the peeling member, and the combustion air can be reliably guided to the throat by this negative pressure.
  • the silencer is a hollow member provided with a silencer on its inner surface, and the mixed gas flows in the hollow portion.
  • the sound deadening member By making the sound deadening member a hollow member, it is possible to quickly mute the sound without affecting the gas flow of the mixed gas.
  • a foam material such as urethane foam can be applied as the sound deadening material.
  • a parallel portion having a constant flow section cross-sectional area in the flow direction of the mixed gas can be provided between the venturi mixer and the silencer.
  • the flowing mixed gas generates noise when the flow velocity changes, and even if a silencer is provided immediately after the portion (throat) where the flow area cross-sectional area changes, there is a possibility that sufficient silencing action cannot be exhibited. . Therefore, it can be expected that the noise reduction effect is further improved by providing a parallel portion in the flow path of the mixed gas and passing the mixed gas through the silencer after making the flow velocity constant at the parallel portion.
  • a raw material gas is injected from a nozzle into a throat and mixed with combustion air to form a mixed gas, and a sound deadening member is provided on the outlet side of the throat to reduce noise generated during the mixing. . Since this silencing member does not affect the flow of the raw material gas and the combustion air and effectively exhibits the silencing effect, the mixed gas production apparatus can be used even at night.
  • FIG. 1 shows a mixed gas production apparatus with a silencer according to the present invention. This apparatus is used when mixing the raw material gas G and the combustion air A to produce a mixed gas M that matches the fuel calories of the city gas (12A, 13A, etc.) that the user normally uses. .
  • This apparatus includes a venturi mixer 1 for mixing the raw material gas G and the combustion air A, a silencer 2 for reducing noise generated in the venturi mixer 1, and a combustion air A corresponding to the supply pressure of the raw material gas G.
  • the air valve 3 is provided for roughly adjusting the supply amount of the air.
  • the venturi mixer 1 includes a nozzle 4 for injecting the raw material gas G, and a throat 5 arranged coaxially with the nozzle 4 and slightly apart.
  • the throat 5 has a constricted portion 6 formed in the vicinity of the inlet, and has a cone shape in which the inner diameter increases toward the outlet.
  • a parallel portion 7 having a constant flow section cross-sectional area in the flow direction is provided on the outlet side of the throat 5.
  • the raw material gas G is supplied to the nozzle 4 through the raw material gas supply pipe 8.
  • An air supply pipe 9 for combustion air A is formed on the inlet side of the throat 5, and combustion air A mixed with the mixed gas M is supplied through the air supply pipe 9.
  • the silencer 2 is provided with a tubular silencer 11 made of foamed polyethylene inside a tube 10 made of vinyl chloride, and a cap formed with a hole for discharging the mixed gas M at the tip thereof. 12 is provided to protect the silencer 11.
  • the silencer 2 has an inlet side connected to the parallel portion 7 and an outlet side connected to a cushion tank (not shown) that temporarily stores the mixed gas M.
  • the material of the tubular body 10 and the silencer 11 can be appropriately changed to other materials as long as the silencing effect is not impaired.
  • the shape of the silencer 11 can be appropriately changed within a range not impairing the silencing action, but it is more preferable that the inner diameter is slightly smaller than the inner diameter of the parallel portion 7 as shown in FIG. . By narrowing the inner diameter of the silencer 11 in this way, the noise generated in the venturi mixer 1 becomes difficult to pass through the silencer 2, and the silencer action by the silencer 11 is further enhanced.
  • the air valve 3 is provided with a diaphragm 12, and a valve body 13 that is coaxially operated with the operation of the diaphragm 12 is provided.
  • the diaphragm 12 is energized by the pressurized air and the spring 16 sent to the spring chamber 14 via the pressure receiving plate 15 from the spring chamber 14 side, while the raw material gas supply pipe 8 from the diaphragm chamber 17 side. It is urged in the reverse direction by the raw material gas G introduced from.
  • the gas pressure of the source gas G increases, the diaphragm 12 is displaced to the left and the valve element 13 moves in the valve opening direction.
  • the gas pressure of the source gas G decreases, the diaphragm 12 is displaced to the right and the valve element is moved.
  • valve body 13 moves in the valve closing direction.
  • the movement of the valve body 13 roughly adjusts the amount of combustion air A supplied to the venturi mixer 1 corresponding to the supply amount of the raw material gas G, and easily and accurately adjusts the mixing ratio in the mixing process. It can be carried out.
  • the silencer 2 is connected to the throat 6 via the parallel portion 7 without being directly connected.
  • the flow cross-sectional area in the flow direction of the mixed gas M is constant. For this reason, the flow velocity of the mixed gas M flowing through the inside is constant.
  • the silencing effect of noise is further improved by passing the mixed gas M through the silencer 2 after the parallel portion 7 is brought into a stable state with a constant flow rate.
  • the length of the silencer 2 can be appropriately changed in consideration of the silencing effect. Further, it is possible to directly connect to the outlet side of the throat 5 without using the parallel portion 7 having a constant inner diameter.
  • the noise level with and without the silencer 2 was compared, the noise level was about 62 dB when the silencer 2 was not provided, and it was a problematic noise level when used at night when the surroundings were quiet. On the other hand, when the silencer 2 was provided, the noise level was reduced by about 10 dB. With this level of noise, there is almost no risk of noise problems even at night.
  • the silencer 2 is provided in the flow path after the raw material gas G and the combustion air A are mixed into the mixed gas M, the flow of the raw material gas G, the combustion air A, and the mixed gas M is hardly affected. Does not affect. For this reason, the mixed gas M adjusted to a predetermined fuel calorie can be smoothly supplied to the user.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Accessories For Mixers (AREA)
  • Gas Burners (AREA)
  • Air Supply (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Nozzles (AREA)

Abstract

The present invention reduces noise while a device is in operation without impairing a Venturi mixer's function of producing mixed gas. Source gas (G) and combustion air (A) are mixed by a Venturi mixer (1) to produce mixed gas (M). A parallel part (7) having a constant inner diameter in the direction of flow of the mixed gas (M) is provided so as to connect with the outlet side of the throat (5) of the Venturi mixer (1). The parallel part (7) is provided with a sound damping device (2) in which a cylindrical sound damping body (11) produced from foamed polyethylene is provided inside a tube body (10). By passing the mixed gas (M) through the sound damping body (11), noise generated when the source gas (G) and the combustion air (A) are mixed can be effectively reduced without affecting the flow of the mixed gas (M).

Description

混合ガス製造装置Mixed gas production equipment
　この発明は、原料ガスをベンチュリーミキサーのノズルからスロートに噴射し、この噴射に伴う負圧によって燃焼用空気を吸い込んで、前記原料ガスと燃焼用空気を混合して混合ガスを製造する際に用いる混合ガス製造装置であって、ガス流路中に、前記混合に伴う騒音を低減する消音装置を設けたものに関する。 The present invention is used when a mixed gas is produced by injecting a raw material gas into a throat from a nozzle of a venturi mixer, sucking combustion air by the negative pressure accompanying this injection, and mixing the raw material gas and the combustion air. The present invention relates to a mixed gas manufacturing apparatus in which a silencer for reducing noise associated with the mixing is provided in a gas flow path.
　混合ガス製造装置は、例えば特許文献１に示すように、原料ガスタンク、空気用コンプレッサ等を備え、この原料ガスタンクから供給される原料ガス（プロパン等）と燃焼用空気を混合し、この混合ガスを一般家庭等の使用者に供給するための装置である。この装置は、特に、地震等の災害時や、夜間工事において都市ガスの供給を一時的に停止する際に用いられ、前記混合ガスは、使用者が通常使用している都市ガス（１２Ａ、１３Ａ等）の燃料カロリーと整合するように、カロリー調節（原料ガスと燃焼用空気との混合割合の調節）がされている。 For example, as shown in Patent Document 1, the mixed gas manufacturing apparatus includes a raw material gas tank, an air compressor, and the like. The raw material gas (propane or the like) supplied from the raw material gas tank is mixed with combustion air. It is a device for supplying to users such as general households. This apparatus is used especially when a disaster such as an earthquake occurs or when the supply of city gas is temporarily stopped during night construction, and the mixed gas is used as a city gas (12A, 13A) that is normally used by a user. Etc.) is adjusted so as to match the fuel calorie (adjustment of the mixing ratio of the raw material gas and the combustion air).
　前記混合には、一般的に、特許文献１に示すベンチュリーミキサーが用いられる。このベンチュリーミキサーは、ノズルから噴射した原料ガスを、ガス流路の途中に絞り部を形成したスロートに送り込み、この原料ガスが前記絞り部を通過する際に、その周囲に生じる負圧によって燃焼用空気を吸い込んで、この原料ガスと燃焼用空気を混合するものである。このスロートの絞り部形状や原料ガスの噴射圧等を変えることによって、原料ガスと燃焼用空気の混合割合を適宜変えることができる。 For the mixing, a venturi mixer shown in Patent Document 1 is generally used. This Venturi mixer feeds the raw material gas injected from the nozzle into a throat having a constricted part in the middle of the gas flow path, and when this raw material gas passes through the constricted part, it is used for combustion by the negative pressure generated around it. Air is sucked and this raw material gas and combustion air are mixed. The mixing ratio of the raw material gas and the combustion air can be appropriately changed by changing the shape of the throttle portion of the throat, the injection pressure of the raw material gas, and the like.
　このベンチュリーミキサーでの混合ガスの製造においては、原料ガスと燃焼用空気の混合に際し、騒音が発生することが多い。この騒音の主な原因として、（１）原料ガスや燃焼用空気が前記絞り部を通過する際に、流速変化を生じることに起因するもの、（２）原料ガスと燃焼用空気の混合（両気流の衝突）に起因するもの、が挙げられる。この騒音を防止するため、装置全体をウレタン等の発泡体で覆うことも考えられるが、コストが嵩むため現実的な方法とは言い難い。 In the production of mixed gas with this Venturi mixer, noise is often generated when mixing raw material gas and combustion air. The main causes of this noise are (1) those caused by the change in flow velocity when the raw material gas and combustion air pass through the throttle part, and (2) the mixing of the raw material gas and the combustion air (both Resulting from the collision of airflow). In order to prevent this noise, it is conceivable to cover the entire apparatus with a foamed material such as urethane. However, since the cost increases, it is difficult to say that it is a realistic method.
　そこで、例えば特許文献２では、特に、上記（２）の混合に起因する騒音を低減すべく、次のような構成を採用している。すなわち、スロートの絞り部材（絞り部）に原料ガス導入用の孔を設けるとともに、この孔よりも上流側に剥離部材を設け、スロートの上流側から供給される燃焼用空気の流れをスロートの軸心側に誘導し、前記孔から供給される原料ガスの流れが、前記燃焼用空気の流れを直接横切らないようにしている（特に、特許文献２の図２を参照）。この構成とすることにより、原料ガスと燃焼用空気の混合の際の両気流の衝突の度合いを小さくし、この混合に伴う騒音の低減を図っている。 Therefore, for example, Patent Document 2 adopts the following configuration in order to reduce noise caused by the mixing (2). That is, a hole for introducing a raw material gas is provided in the throttle member (throttle part) of the throat, and a separation member is provided upstream of the hole so that the flow of combustion air supplied from the upstream side of the throat The flow of the raw material gas that is guided to the center side and is supplied from the hole does not directly cross the flow of the combustion air (in particular, refer to FIG. 2 of Patent Document 2). By adopting this configuration, the degree of collision of both airflows when mixing the raw material gas and the combustion air is reduced, and noise associated with this mixing is reduced.
　なお、特許文献１に記載の構成では、原料ガスをノズルからスロートに噴射して燃焼用空気を吸い込むのに対し、特許文献２に記載の構成では、燃焼用空気をまずスロートに流して原料ガスを吸い込むという点で異なるが、一方の気体をスロートに流して、他方の気体を吸い込むというベンチュリーミキサーの機能を利用した点において同じである。 In the configuration described in Patent Document 1, the raw material gas is injected from the nozzle into the throat and the combustion air is sucked, whereas in the configuration described in Patent Document 2, the combustion air is first flowed into the throat to supply the raw material gas. However, it is the same in that the function of the venturi mixer is used in which one gas is caused to flow into the throat and the other gas is sucked.
特許第４６０４１１３号公報Japanese Patent No. 4604113 特開平８－２９６８１２号公報JP-A-8-296812
　特許文献２の構成によると、上記（２）の原料ガスと燃焼用空気の混合に係る騒音は低減できるが、上記（１）の騒音は却って増大する恐れがある。これは、前記剥離部材を設けることによって、その部分の流動断面積が部分的に小さくなり、その部分を燃焼用空気が通過する際の流速変化が大きくなりやすいためである。このため、トータル的に見て、騒音の低減があまり効率的でないという問題がある。 According to the configuration of Patent Document 2, the noise related to the mixing of the raw material gas and the combustion air in (2) can be reduced, but the noise in (1) may be increased. This is because by providing the peeling member, the flow cross-sectional area of the portion is partially reduced, and the change in flow velocity when the combustion air passes through the portion is likely to increase. For this reason, there is a problem that noise reduction is not very efficient in total.
　また、燃焼用空気が原料ガスの供給用の孔から少し離れたところを流動することになり、スロートにおける原料ガスの吸い込み作用が不十分となりやすい。この吸い込み不足を補うため、原料ガスのガス圧を高める等の対策が必要となることもあり得る。 Also, the combustion air flows a little away from the source gas supply hole, so that the source gas suction action in the throat tends to be insufficient. To compensate for this shortage of suction, measures such as increasing the gas pressure of the raw material gas may be required.
　そこで、本願発明は、ベンチュリーミキサーによる混合ガスの製造機能を損なうことなく、装置稼働時の騒音を低減することを課題とする。 Therefore, an object of the present invention is to reduce noise during operation of the apparatus without impairing the mixed gas production function of the venturi mixer.
　上記の課題を解決するため、この発明は、原料ガス供給手段と、空気供給手段と、前記原料ガス供給手段から供給される原料ガスと前記空気供給手段から供給される燃焼用空気とを混合するベンチュリーミキサーと、このベンチュリーミキサーの混合ガス出口側に設けられ、前記混合に伴う騒音を低減する消音装置とから混合ガス製造装置を構成した。 In order to solve the above problems, the present invention mixes a raw material gas supply means, an air supply means, a raw material gas supplied from the raw material gas supply means, and combustion air supplied from the air supply means. A mixed gas production apparatus was constituted by a venturi mixer and a muffler provided on the mixed gas outlet side of the venturi mixer to reduce noise caused by the mixing.
　原料ガスと燃焼用空気の混合に伴う騒音の大部分は、スロートの混合ガス出口側から、この混合ガスの配管内を通ってベンチュリーミキサー外に伝わる。そこで、この混合ガスの出口側に消音装置を設けることで、その騒音を低減することができる。しかも、この消音装置をガス混合が終了した後のスロートの外に設けたため、特許文献２に示したように、スロート内に、原料ガス（同文献では燃焼用空気）の流動を誘導する剥離部材を設ける必要はない。このため、剥離部材によってスロートの絞り部の流動断面積が部分的に小さくなり、この絞り部における流速変化に伴って騒音（上記（１）の騒音）が発生するのを抑制することができる。 ¡Most of the noise associated with the mixing of raw material gas and combustion air is transmitted from the mixed gas outlet side of the throat to the outside of the venturi mixer through the mixed gas piping. Therefore, the noise can be reduced by providing a silencer on the outlet side of the mixed gas. Moreover, since this silencer is provided outside the throat after the gas mixing is completed, as shown in Patent Document 2, a peeling member that induces the flow of the source gas (combustion air in the same document) in the throat. There is no need to provide. For this reason, the flow cross-sectional area of the throttle portion of the throat is partially reduced by the peeling member, and it is possible to suppress the generation of noise (noise (1) above) due to the flow velocity change in the throttle portion.
　しかも、原料ガスの流動に伴う負圧の形成が剥離部材によって妨げられることがなく、この負圧によって燃焼用空気を確実にスロートに導くことができる。 Moreover, the formation of the negative pressure accompanying the flow of the raw material gas is not hindered by the peeling member, and the combustion air can be reliably guided to the throat by this negative pressure.
　また、このベンチュリーミキサーでは、原料ガスの噴射に伴って、燃焼用空気もスロートに取り込まれるが、これらの流動方向は、特許文献２に記載の構成ではほぼ直交するのに対して、平行に近い（本願発明に係る図１中の矢印Ａ、Ｇを参照）。このため、この特許文献２に記載の剥離部材がなくても、原料ガスと燃焼用空気の混合に起因する騒音（上記（２）の騒音）は生じにくい。 In this Venturi mixer, combustion air is also taken into the throat as the raw material gas is injected, but the flow direction is almost parallel to the configuration described in Patent Document 2 while being almost orthogonal. (See arrows A and G in FIG. 1 according to the present invention). For this reason, even if there is no peeling member of this patent document 2, the noise (noise of said (2)) resulting from mixing of source gas and combustion air is hard to produce.
　前記混合ガス製造装置の構成においては、前記消音装置は、その内面に消音材を設けた中空部材であって、その中空部に前記混合ガスを流動させるようにするのが好ましい。 In the configuration of the mixed gas production apparatus, it is preferable that the silencer is a hollow member provided with a silencer on its inner surface, and the mixed gas flows in the hollow portion.
　消音部材を中空部材とすることにより、混合ガスのガス流動に影響を与えることなく、速やかに消音を図ることができる。この消音材として、例えば発泡ウレタン等の発泡材を適用できる。 By making the sound deadening member a hollow member, it is possible to quickly mute the sound without affecting the gas flow of the mixed gas. For example, a foam material such as urethane foam can be applied as the sound deadening material.
　また、前記各構成においては、前記ベンチュリーミキサーと前記消音装置の間に、前記混合ガスの流動方向の流動部断面積が一定の平行部を設けることができる。 Further, in each of the above configurations, a parallel portion having a constant flow section cross-sectional area in the flow direction of the mixed gas can be provided between the venturi mixer and the silencer.
　流動する混合ガスは、その流速が変化する際に騒音を発生し、前記流動部断面積が変化する部分（スロート）の直後に消音装置を設けても、十分な消音作用を発揮できない恐れがある。そこで、混合ガスの流路中に平行部を設け、この平行部でその流速を一定とした後に、この混合ガスを消音装置に通すことにより、騒音の消音作用が一層向上すると期待できる。 The flowing mixed gas generates noise when the flow velocity changes, and even if a silencer is provided immediately after the portion (throat) where the flow area cross-sectional area changes, there is a possibility that sufficient silencing action cannot be exhibited. . Therefore, it can be expected that the noise reduction effect is further improved by providing a parallel portion in the flow path of the mixed gas and passing the mixed gas through the silencer after making the flow velocity constant at the parallel portion.
　この発明は、原料ガスをノズルからスロートに噴射して燃焼用空気と混合して混合ガスとし、スロートの出口側に消音部材を設けて、前記混合の際に発生する騒音を低減するようにした。この消音部材は、原料ガス及び燃焼用空気の流動に影響を与えず、効果的に消音効果を発揮するため、夜間においても混合ガス製造装置を使用することが可能となった。 According to the present invention, a raw material gas is injected from a nozzle into a throat and mixed with combustion air to form a mixed gas, and a sound deadening member is provided on the outlet side of the throat to reduce noise generated during the mixing. . Since this silencing member does not affect the flow of the raw material gas and the combustion air and effectively exhibits the silencing effect, the mixed gas production apparatus can be used even at night.
この発明に係る混合ガス製造装置の断面図Sectional drawing of the mixed gas manufacturing apparatus which concerns on this invention
　この発明に係る消音装置付き混合ガス製造装置を図１に示す。この装置は、原料ガスＧと燃焼用空気Ａとを混合して、使用者が通常使用している都市ガス（１２Ａ、１３Ａ等）の燃料カロリーと整合する混合ガスＭを製造する際に用いられる。 FIG. 1 shows a mixed gas production apparatus with a silencer according to the present invention. This apparatus is used when mixing the raw material gas G and the combustion air A to produce a mixed gas M that matches the fuel calories of the city gas (12A, 13A, etc.) that the user normally uses. .
　この装置は、原料ガスＧと燃焼用空気Ａとを混合するベンチュリーミキサー１と、ベンチュリーミキサー１で生じた騒音を低減する消音装置２と、原料ガスＧの供給圧力に対応して燃焼用空気Ａの供給量を粗調節する空気弁３を備えている。 This apparatus includes a venturi mixer 1 for mixing the raw material gas G and the combustion air A, a silencer 2 for reducing noise generated in the venturi mixer 1, and a combustion air A corresponding to the supply pressure of the raw material gas G. The air valve 3 is provided for roughly adjusting the supply amount of the air.
　ベンチュリーミキサー１は、原料ガスＧを噴射するノズル４と、このノズル４と同軸に、かつ少し離間して配置したスロート５を備えている。このスロート５は、入口近傍に絞り部６が形成されており、出口側ほど内径が大きくなるコーン形状をしている。そして、このスロート５の出口側には、流動方向の流動部断面積を一定とした平行部７が連設されている。 The venturi mixer 1 includes a nozzle 4 for injecting the raw material gas G, and a throat 5 arranged coaxially with the nozzle 4 and slightly apart. The throat 5 has a constricted portion 6 formed in the vicinity of the inlet, and has a cone shape in which the inner diameter increases toward the outlet. A parallel portion 7 having a constant flow section cross-sectional area in the flow direction is provided on the outlet side of the throat 5.
　ノズル４には、原料ガス供給管８を通じて原料ガスＧが供給される。また、スロート５の入口側には燃焼用空気Ａの空気供給管９が形成されていて、この空気供給管９を通じて、混合ガスＭと混合する燃焼用空気Ａが供給される。 The raw material gas G is supplied to the nozzle 4 through the raw material gas supply pipe 8. An air supply pipe 9 for combustion air A is formed on the inlet side of the throat 5, and combustion air A mixed with the mixed gas M is supplied through the air supply pipe 9.
　消音装置２は、塩化ビニル製の管体１０の内側に、発泡ポリエチレンからなる筒状の消音体１１を設けたものであって、その先端には、混合ガスＭを排出する孔を形成したキャップ１２が設けられ、消音体１１を保護している。この消音装置２の入口側は平行部７に、出口側は混合ガスＭを一時的に貯蔵するクッションタンク（図示せず）に接続されている。この管体１０及び消音体１１の素材は、消音作用を損なわない限りにおいて、他の素材に適宜変更することができる。 The silencer 2 is provided with a tubular silencer 11 made of foamed polyethylene inside a tube 10 made of vinyl chloride, and a cap formed with a hole for discharging the mixed gas M at the tip thereof. 12 is provided to protect the silencer 11. The silencer 2 has an inlet side connected to the parallel portion 7 and an outlet side connected to a cushion tank (not shown) that temporarily stores the mixed gas M. The material of the tubular body 10 and the silencer 11 can be appropriately changed to other materials as long as the silencing effect is not impaired.
　また、この消音体１１の形状は、その消音作用を損なわない範囲において適宜変更することができるが、図１に示すように、その内径を平行部７の内径よりも少し小さくするのがより好ましい。このように消音体１１の内径を狭めることにより、ベンチュリーミキサー１で生じた騒音が、この消音装置２を素通りしにくくなり、消音体１１による消音作用が一層高まるためである。 Further, the shape of the silencer 11 can be appropriately changed within a range not impairing the silencing action, but it is more preferable that the inner diameter is slightly smaller than the inner diameter of the parallel portion 7 as shown in FIG. . By narrowing the inner diameter of the silencer 11 in this way, the noise generated in the venturi mixer 1 becomes difficult to pass through the silencer 2, and the silencer action by the silencer 11 is further enhanced.
　空気弁３はダイヤフラム１２を備え、このダイヤフラム１２の動作と同軸に連動する弁体１３が設けられている。このダイヤフラム１２は、バネ室１４側から受圧板１５を介して、このバネ室１４に送り込まれた加圧空気及びバネ１６によって付勢される一方で、ダイヤフラム室１７側から、原料ガス供給管８から導かれた原料ガスＧによって逆方向に付勢されている。原料ガスＧのガス圧が高くなると、ダイヤフラム１２が左方に変位し弁体１３が開弁方向に動く一方で、原料ガスＧのガス圧が低くなると、ダイヤフラム１２が右方に変位し弁体１３が閉弁方向に動く。この弁体１３の動きにより、原料ガスＧの供給量に対応するベンチュリーミキサー１に供給する燃焼用空気Ａの量の粗調節がなされ、両者の混合過程における混合割合の調節を容易にかつ精度良く行うことができる。 The air valve 3 is provided with a diaphragm 12, and a valve body 13 that is coaxially operated with the operation of the diaphragm 12 is provided. The diaphragm 12 is energized by the pressurized air and the spring 16 sent to the spring chamber 14 via the pressure receiving plate 15 from the spring chamber 14 side, while the raw material gas supply pipe 8 from the diaphragm chamber 17 side. It is urged in the reverse direction by the raw material gas G introduced from. When the gas pressure of the source gas G increases, the diaphragm 12 is displaced to the left and the valve element 13 moves in the valve opening direction. On the other hand, when the gas pressure of the source gas G decreases, the diaphragm 12 is displaced to the right and the valve element is moved. 13 moves in the valve closing direction. The movement of the valve body 13 roughly adjusts the amount of combustion air A supplied to the venturi mixer 1 corresponding to the supply amount of the raw material gas G, and easily and accurately adjusts the mixing ratio in the mixing process. It can be carried out.
　ノズル４からスロート５に向けて原料ガスＧを噴射すると（図１中の矢印Ｇを参照）、このスロート５の入口付近が負圧となって、空気供給管９から供給される燃焼用空気Ａが、このスロート５内に吸い込まれる（同図中の矢印Ａを参照）。原料ガスＧは燃焼用空気Ａと混合されて混合ガスＭとなる。 When the raw material gas G is injected from the nozzle 4 toward the throat 5 (see arrow G in FIG. 1), the combustion air A supplied from the air supply pipe 9 becomes negative pressure near the inlet of the throat 5. Is sucked into the throat 5 (see arrow A in the figure). The raw material gas G is mixed with the combustion air A to become a mixed gas M.
　この混合に伴って発生する騒音は、消音装置２によって低減される。本実施形態においては、この消音装置２をスロート６に直結せずに、平行部７を介して接続している。この平行部７において、混合ガスＭの流動方向の流動断面積は一定である。このため、この中を流動する混合ガスＭの流速は一定となる。このように、平行部７で流速一定の安定状態とした後に、この混合ガスＭを消音装置２に通すことにより、騒音の消音作用が一層向上すると期待できる。 The noise generated with this mixing is reduced by the silencer 2. In the present embodiment, the silencer 2 is connected to the throat 6 via the parallel portion 7 without being directly connected. In the parallel portion 7, the flow cross-sectional area in the flow direction of the mixed gas M is constant. For this reason, the flow velocity of the mixed gas M flowing through the inside is constant. As described above, it is expected that the silencing effect of noise is further improved by passing the mixed gas M through the silencer 2 after the parallel portion 7 is brought into a stable state with a constant flow rate.
　この消音装置２の長さは、その消音効果を考慮した上で適宜変更することができる。また、内径が一定の平行部７を用いることなく、スロート５の出口側に直結することもできる。 The length of the silencer 2 can be appropriately changed in consideration of the silencing effect. Further, it is possible to directly connect to the outlet side of the throat 5 without using the parallel portion 7 having a constant inner diameter.
　この消音装置２の有無による騒音レベルを比較したところ、消音装置２を設けない場合は約６２ｄＢで、周囲が静かな夜間に用いる場合には、問題となる騒音レベルであった。これに対し、消音装置２を設けた場合は、これより約１０ｄＢも騒音レベルが低下した。この程度の騒音レベルであれば、夜間であっても騒音問題を生じる恐れはほとんどない。 When the noise level with and without the silencer 2 was compared, the noise level was about 62 dB when the silencer 2 was not provided, and it was a problematic noise level when used at night when the surroundings were quiet. On the other hand, when the silencer 2 was provided, the noise level was reduced by about 10 dB. With this level of noise, there is almost no risk of noise problems even at night.
　また、消音装置２を原料ガスＧと燃焼用空気Ａを混合して混合ガスＭとした後の流路中に設けたので、原料ガスＧ、燃焼用空気Ａ、及び混合ガスＭの流動にほとんど影響を与えない。このため、所定の燃料カロリーに調節した混合ガスＭを円滑に使用者に供給することができる。 Further, since the silencer 2 is provided in the flow path after the raw material gas G and the combustion air A are mixed into the mixed gas M, the flow of the raw material gas G, the combustion air A, and the mixed gas M is hardly affected. Does not affect. For this reason, the mixed gas M adjusted to a predetermined fuel calorie can be smoothly supplied to the user.
１　ベンチュリーミキサー
２　消音装置
３　空気弁
４　ノズル
５　スロート
６　絞り部
７　平行部
８　原料ガス供給管（原料ガス供給手段）
９　空気供給管（空気供給手段）
１０　管体
１１　消音体
１２　キャップ
Ａ　燃焼用空気
Ｇ　原料ガス
Ｍ　混合ガス DESCRIPTION OF SYMBOLS 1 Venturi mixer 2 Silencer 3 Air valve 4 Nozzle 5 Throat 6 Throttle part 7 Parallel part 8 Source gas supply pipe (source gas supply means)
9 Air supply pipe (air supply means)
10 Tubing body 11 Silencer body 12 Cap A Combustion air G Raw material gas M Mixed gas

Claims (3)

  1. 　原料ガス供給手段（８）と、空気供給手段（９）と、前記原料ガス供給手段（８）から供給される原料ガス（Ｇ）と前記空気供給手段（９）から供給される燃焼用空気（Ａ）とを混合するベンチュリーミキサー（１）と、前記ベンチュリーミキサー（１）の混合ガス（Ｍ）の出口側に設けられ、前記混合に伴う騒音を低減する消音装置（２）とを備えた混合ガス製造装置。 Source gas supply means (8), air supply means (9), source gas (G) supplied from the source gas supply means (8) and combustion air supplied from the air supply means (9) ( A Venturi mixer (1) for mixing A) and a muffler (2) provided on the outlet side of the mixed gas (M) of the Venturi mixer (1) and for reducing noise associated with the mixing Gas production equipment.
  2. 　前記消音装置（２）は、その内面に消音材（１１）を設けた中空部材であって、その中空部に前記混合ガス（Ｍ）を流動させるようにした請求項１に記載の混合ガス製造装置。 2. The mixed gas production according to claim 1, wherein the silencer (2) is a hollow member having a silencer (11) provided on an inner surface thereof, and the mixed gas (M) flows in the hollow portion. apparatus.
  3. 　前記ベンチュリーミキサー（１）と前記消音装置（２）の間に、前記混合ガス（Ｍ）の流動方向の流動部断面積が一定の平行部（７）を設けた請求項１又は２に記載の混合ガス製造装置。 3. The parallel portion (7) according to claim 1, wherein a parallel portion (7) having a constant flow section cross-sectional area in the flow direction of the mixed gas (M) is provided between the venturi mixer (1) and the silencer (2). Mixed gas production equipment.
PCT/JP2011/051287 2011-01-25 2011-01-25 Mixed gas production device WO2012101755A1 (en)

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