JP2022025394A - Premixing device and combustion device comprising the same - Google Patents

Abstract

To provide a premixing device capable of appropriately coping with plural kinds of fuel gas without replacing parts or adding new parts according to a kind of fuel gas.SOLUTION: A premixing device A comprises a fuel gas flow path adjustment member 8 that is directly or indirectly attached to a premixing flow path forming member 4 and can block a part of a fuel gas flow path 7. A mounting mode of the fuel gas flow path adjusting member 8 can be changed, and with this change in the mounting mode, a position and/or area where the fuel gas flow path adjustment member 8 blocks the fuel gas flow path 7 is changed, so that the flow path resistance of the fuel gas flow path 7 can be changed.SELECTED DRAWING: Figure 5

Description

The present invention relates to a premixing device and a combustion device including the premixing device.
Here, the "premixing" is a process of premixing air and a fuel gas to generate a combustible mixed gas for the purpose of performing premixing combustion.

As a specific example of the premixer, there is one described in Patent Document 1.
The premixing device described in the same document includes a tubular member (premixing flow path forming member) forming a Venturi-shaped premixing flow path, and two vertical and horizontal blade portions mounted in the tubular member. I have. The intake side of the fan is connected to the downstream side (termination side) of the premixed flow path, and air flows into the premixed flow path from the upstream side (starting end side). The blade portion is provided with a fuel gas outlet, and when air flows through the premixed flow path and a negative pressure is generated, the action of this negative pressure causes the fuel gas from the fuel gas outlet to the premixed flow path. Outflows and mixes with air.

However, in the above-mentioned prior art, there is room for improvement as described below.

That is, the fuel gas used in the premixer is not one type, but generally one of two types of fuel gas, natural gas and LP gas, is used. However, since these two types of fuel gas differ in composition and calorific value, it is necessary to make the premixing device compatible with the type of fuel gas.
Specifically, the premixer is provided with a fuel gas flow path for guiding the fuel gas from the outside of the premix flow path forming member to the fuel gas outlet, and the fuel gas flow path is a fuel. It needs to correspond to the type of gas. When the negative pressure generated in the premixed flow path is the same, the amount of outflow from the fuel gas outlet to the premixed flow path is larger in the fuel gas with a smaller calorific value than in the fuel gas with a larger calorific value. The premixer must be configured to be such a specification.

On the other hand, conventionally, no means has been proposed for simply and appropriately responding to the above-mentioned matters. Conventionally, parts corresponding to the type of fuel gas are manufactured and prepared in advance, and if a fuel gas of a type different from the planned fuel gas is used, the parts are replaced or new. The reality is that countermeasures such as adding parts are being adopted.
However, this requires replacement or additional parts, and the number of these parts in stock is large, so that the cost is high. In addition, parts management becomes troublesome. Furthermore, when a part is replaced, the original replaced part may be disused.

Special Table No. 11-502278 Gazette

The present invention has been conceived under the above-mentioned circumstances, and is applied to a plurality of types of fuel gas without replacing parts or adding new parts according to the type of fuel gas. It is an object of the present invention to provide a premixing device capable of appropriately responding to the above and a combustion device equipped with the premixing device.

In order to solve the above problems, the following technical means are taken in the present invention.

The premixing device provided by the first aspect of the present invention forms a premixing flow path for allowing air to flow from one end side to the other end side and for mixing the fuel gas with the air. The premixed flow path forming member, the fuel gas supply port that receives the fuel gas supply from the outside, and the fuel gas outlet that opens in the premixed flow path, and the fuel gas is supplied to the fuel gas supply port. A premixer comprising a fuel gas flow path for guiding a fuel gas to the fuel gas outlet, which is directly or indirectly attached to the premixed flow path forming member and the fuel gas. A fuel gas flow path adjusting member capable of closing a part of the flow path is further provided, and the mounting mode of the fuel gas flow path adjusting member can be changed, and by changing the mounting mode, the above-mentioned The position and / or area of the fuel gas flow path adjusting member that closes the fuel gas flow path is changed, so that the flow path resistance of the fuel gas flow path can be changed.
Here, "the mounting mode of the fuel gas flow path adjusting member can be changed" means that at least one of the mounting position, orientation, angle, or posture of the fuel gas flow path adjusting member can be changed. The case applies.
The "change in the area blocking the fuel gas flow path" includes the case where the area blocking the fuel gas flow path is changed to zero.

With such a configuration, the following effects can be obtained.
That is, it is possible to change the flow path resistance of the fuel gas flow path by changing the mounting mode of the fuel gas flow path adjusting member and changing the area where the fuel gas flow path adjusting member blocks the fuel gas flow path. be. For example, in the case of a fuel gas having a large calorific value, the area blocking the fuel gas flow path is increased and the flow path resistance is set to be large, and in the case of a fuel gas having a low calorific value, the fuel gas flow path is set. By reducing the blocking area and setting the flow path resistance to a small value, it is possible to maintain the mixing ratio of air and fuel gas in an appropriate range.
Therefore, according to the present invention, when the type of fuel gas is different from the planned type of fuel gas, it is not necessary to replace the fuel gas flow path adjusting member with another member, and the fuel gas flow path adjusting member does not need to be replaced with another member. There is no need to use additional new parts. Therefore, there is no problem that the number of parts in stock for corresponding to the type of fuel gas is increased, the cost required for inventuring the parts can be reduced, and the parts management can be facilitated. In the case of parts replacement, the original parts may be disused, but according to the present invention, there is no such waste.

In the present invention, preferably, the fuel gas is configured to flow out from the fuel gas outlet to the premixed flow path due to the action of negative pressure generated by the air flow in the premixed flow path. There is.
The present invention is most suitable for a premixer having such a configuration.

In the present invention, preferably, the fuel gas includes predetermined first and second fuel gases of different types, and the fuel gas flow path is used as the first fuel gas flow path as an attachment mode of the fuel gas flow path adjusting member. It is possible to selectively set either the first mounting mode corresponding to the fuel gas of the above and the second mounting mode corresponding to the second fuel gas.

According to such a configuration, the fuel gas flow path adjusting member is provided with the first and second fuel gas flow path adjusting members depending on whether the fuel gas used for premixing is a predetermined first or second fuel gas. It suffices to set it on the corresponding side of either one of the mounting modes. Therefore, it is possible to facilitate and optimize the setting work of the fuel gas flow path adjusting member.

In the present invention, preferably, the first and second gas type display units indicating the first and second fuel gases are further provided, and the fuel gas flow path adjusting member is the first mounting mode. When set to, the second gas type display unit is covered by the fuel gas flow path adjusting member, and the first gas type display unit is exposed, while the fuel gas flow is exposed. When the path adjusting member is set to the second mounting mode, the first gas type display unit is covered by the fuel gas flow path adjusting member, and the second gas type display unit is exposed. It is configured to be in the same state.

According to such a configuration, among the first and second gas type display units, the gas type display unit on the exposed side, which is not covered by the fuel gas flow path adjusting member, is the fuel gas flow. It indicates whether the fuel gas corresponding to the mounting mode of the road adjusting member is the first fuel gas or the second fuel gas. Therefore, it is possible to easily and quickly confirm whether or not the type of fuel gas actually used and the mounting mode of the fuel gas flow path adjusting member correspond to each other. For example, although the fuel gas flow path adjusting member is in the mounting mode corresponding to the first fuel gas (first mounting mode), it is mounted in a mounting mode corresponding to the second fuel gas (first mounting mode). It is also possible to appropriately eliminate the fact that it is erroneously determined to be the mounting mode (2).

In the present invention, preferably, a pipe joint portion having a tubular portion having a tip opening for connecting the gas pipe for supplying the fuel gas is further provided, and the fuel gas supply port is inside the tubular portion. The fuel gas flow path adjusting member is provided in the inner side wall portion of the above, is inserted into the tubular portion from the tip opening thereof, and is attached to the inner side wall portion by using a fastening member.

According to such a configuration, the area for closing the fuel gas supply port is appropriately set by a simple structure in which the fuel gas flow path adjusting member is attached to the inner side wall portion in the tubular portion of the pipe joint portion by using the fastening member. It is possible to change to, and the effect intended by the present invention can be obtained. The mounting mode of the fuel gas flow path adjusting member can be easily changed in a state where the gas pipe is not connected to the tubular portion of the pipe joint portion, and the workability thereof can be improved.

In the present invention, preferably, the portion of the fuel gas flow path near the fuel gas supply port is divided into a plurality of parallel flow paths, and as the fuel gas supply port, a plurality of portions corresponding to the plurality of parallel flow paths. A fuel gas supply port is provided, and the position and / or number of the fuel gas flow path adjusting member closing the plurality of fuel gas supply ports can be changed.

According to such a configuration, the fuel gas flow path is divided into a plurality of parallel flow paths and has a plurality of fuel gas supply ports, whereas the fuel gas flow path adjusting member has a plurality of them. It may be installed so that the position and / or number of blocking the fuel gas supply port can be changed. Therefore, the whole structure can be simplified, and the mounting mode of the fuel gas flow path adjusting member can be easily changed.

In the present invention, preferably, as the plurality of parallel flow paths, the first and second parallel flow paths having different flow path areas are provided, and as the plurality of fuel gas supply ports, the first and second parallel flow paths are provided. The fuel gas flow path adjusting member is provided with first and second fuel gas supply ports corresponding to the flow paths of the above, and the fuel gas flow path adjusting member may selectively block one of the first and second fuel gas supply ports. It is possible.

According to such a configuration, since the flow path areas of the first and second parallel flow paths are different, which of the first and second fuel gas supply ports corresponding to them is used as the fuel gas flow path adjusting member. The flow path resistance of the fuel gas flow path will be different depending on whether it is blocked by. Therefore, it is possible to further facilitate and optimize the flow path resistance of the fuel gas flow path to appropriately correspond to the type of fuel gas.

In the present invention, preferably, among the first and second parallel flow paths, the portions of the first and second parallel flow paths near the first and second fuel gas supply ports have the same shape and size, and the fuel gas flow. The road adjusting member has a convex portion for a seal that can be fitted into the first and second fuel gas supply ports.

According to such a configuration, when either one of the first and second fuel gas supply ports is closed, a convex portion for sealing can be fitted in this portion. Therefore, it is possible to appropriately prevent leakage of fuel gas. The first and second parallel flow paths are basically flow paths having different flow path areas, but the parts near the first and second fuel gas supply ports have the same shape and size. Therefore, it is possible to appropriately fit the convex portion for sealing into any of these parts in a highly airtight state.

The combustion apparatus provided by the second aspect of the present invention is characterized by comprising the premixing apparatus provided by the first aspect of the present invention.

With such a configuration, the same effect as described for the premixing apparatus provided by the first aspect of the present invention can be obtained.

Other features and advantages of the invention will become more apparent from the following description of embodiments of the invention with reference to the accompanying drawings.

It is explanatory drawing which shows an example of the combustion apparatus provided with the premixing apparatus which concerns on this invention, and the hot water supply apparatus using this. FIG. 2 is a sectional view taken along line II-II of FIG. It is external perspective view of the premixing apparatus shown in FIG. 1 and FIG. (A) is an IV-IV cross-sectional view of FIG. 3, and (b) is an exploded cross-sectional view of (a). FIG. 6 is a sectional view taken along line VV of FIG. It is a front view of the main part of the premixing apparatus shown in FIG. FIG. 6 is an exploded front view of a main part of FIG. It is a front view of the main part which shows the example which set the fuel gas flow path adjustment member in a mode different from FIG. The fuel gas flow path adjusting member used in the premixer shown in FIGS. 1 to 8 is shown, (a) is a perspective view from the outer surface side, and (b) is a perspective view from the inner surface side. be. It is an external perspective view which shows the other example of the premixing apparatus which concerns on this invention. (A) is a sectional view taken along the line XI-XI of FIG. 10, and FIG. 10 (b) is an exploded sectional view of a main part of (a). It is a front view of the main part of the premixing apparatus shown in FIG. FIG. 12 is an exploded front view of a main part of FIG. It is a front view of the main part which shows the example which set the fuel gas flow path adjustment member in a mode different from FIG. It is a perspective view from the inner surface side which shows the fuel gas flow path adjusting member used in the premixing apparatus shown in FIGS. 10 to 14. It is a front view of the main part which shows the other example of the premixing apparatus which concerns on this invention. (A) is a cross-sectional view taken along the line XVII-XVII of FIG. 16, and (b) is an exploded cross-sectional view of a main part of (a). FIG. 16 is an exploded front view of a main part of FIG. It is a front view of the main part which shows the example which set the fuel gas flow path adjustment member in a mode different from FIG. It is a main part exploded front view which shows the other example of the premixing apparatus which concerns on this invention. (A) and (b) are front views of the main part showing a state in which the fuel gas flow path adjusting member is attached in the configuration shown in FIG. It is a front view of the main part which shows the other example of the premixing apparatus which concerns on this invention. It is sectional drawing of the main part of XXIII-XXIII of FIG. FIG. 22 is an exploded front view of a main part of FIG. An example in which the fuel gas flow path adjusting member is set in a mode different from that of FIG. 22 is shown, where FIG. 22A is a front view of a main part, and FIG. 22B is a sectional view taken along line XXV-XXV of FIG. 22A. Another example of the premixing apparatus according to the present invention is shown, (a) is a front view of a main part, and (b) is a sectional view taken along the line XXVI-XXVI of (a). FIG. 26 (a) is an exploded front view of a main part. An example in which the fuel gas flow path adjusting member is set in a mode different from that of FIG. 26 is shown, (a) is a front view of a main part, and (b) is a cross-sectional view of XXVIII-XXVIII of (a). It is a main part exploded sectional view which shows the other example of the premixing apparatus which concerns on this invention.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 shows a premixing device A, a combustion device B (premixing combustion device) configured by combining the premixing device A with a fan 1 and a combustion plate 2, and a heat exchanger 11 combined with the combustion device B. The configured hot water supply device WH is shown.

The details of the premixer A will be described later, but the premixer A is used to generate a mixed gas (combustible mixed gas) of air and fuel gas, and the mixed gas passes through the fan 1. Is discharged toward the combustion plate 2. The combustion plate 2 is a porous plate having a plurality of ventilation holes 20 and is housed in the case 10. The mixed gas passes through the combustion plate 2 and burns below the combustion plate 2. The combustion gas generated by this acts on the heat exchanger 11, and the hot water passing through the heat exchanger 11 is heated. As a result, hot water is generated, and this hot water is supplied to a desired hot water supply destination.

The premixing device A is provided with a premixing flow path forming member 4 having a tubular portion 41 forming the premixing flow path 40, a housing member 5 attached to the premixing flow path forming member 4, and a fuel gas outlet 74. Each of the blade portions 6 provided with the fuel gas flow path 7 including the fuel gas outlet 74, and the fuel gas flow path adjusting member 8 shown in FIGS. 3 to 9 are provided.

The premixed flow path forming member 4 is connected to the intake side of the fan 1, and when the fan 1 is driven, external air flows into the premixed flow path 40 from the opening on one end side thereof. In the premixed flow path 40, the region on the upstream side in the gas flow direction is a tapered region in which the inner diameter gradually decreases toward the downstream side in the gas flow direction, and the region on the downstream side of the tapered region has a gradual inner diameter toward the downstream side. It is a venturi-like area with an expanding tapered area.

Each blade portion 6 serves as a nozzle for flowing out fuel gas from the fuel gas outlet 74 to the premixed flow path 40, and as shown in FIG. 2, the peripheral wall portion of the tubular portion 41 has a portion. It has a bridging shape with both ends connected and is located in the premixed flow path 40. The pair of blade portions 6 are arranged substantially in parallel with each other at appropriate intervals in the thickness direction (left-right direction in FIG. 1).

The inside of each blade portion 6 is a cavity portion 73 forming a part of the fuel gas flow path 7, and the fuel gas outlet 74 communicates with the cavity portion 73. On the other hand, the air flow in the premixed flow path 40 generates a negative pressure in the vicinity of the fuel gas outlet 74. Due to the action of this negative pressure, the fuel gas flows out from the fuel gas outlet 74 to the premixing flow path 40, and the air and the fuel gas are mixed.
The number of blade portions 6 is not limited to two, and may be one or three or more.

The housing member 5 includes a tubular housing main body 50, a pipe joint 51 integrally or separately provided in the housing main body 50, and a flange 53 having a bolt insertion hole 52. The flange portion 53 helps to easily and appropriately connect the premixing device A to a desired portion.

The housing main body 50 is fitted onto the step portions 42a and 42b provided on the outer periphery of the premixed flow path forming member 4, and the premixed flow path forming member 4 is hermetically sealed by the sealing ring 49. Surrounding. The region 72 between the premixed flow path forming member 4 and the housing main body 50 forms a part of the fuel gas flow path 7.

The pipe joint portion 51 is a portion to which the gas pipe 9 (including the hose) for supplying the fuel gas is connected, and the fuel gas supplied from the gas pipe 9 to the pipe joint portion 51 flows into the above-mentioned region 72. .. As shown in FIG. 2, the premixed flow path forming member 4 is formed with an opening 43 communicating with the cavity 73 in each blade portion 6. The fuel gas that has flowed into the region 72 passes through the opening 43, flows into each blade portion 6, and flows out from the fuel gas outlet 74 as described above.

Explaining the pipe joint portion 51 in more detail, the pipe joint portion 51 includes a tubular portion 51a having a tip opening, and a fuel gas supply port 70 is provided in the inner portion of the tubular portion 51a. The inner side wall portion 51b is provided.
The fuel gas flow path 7 is a flow path that guides fuel gas from the fuel gas supply port 70 to the fuel gas outlet 74. However, as shown in FIGS. 4 to 8, the pipe joint portion 51 is provided with first and second parallel flow paths 71A and 71B forming a part of the fuel gas flow path 7 side by side at appropriate intervals. And as their openings, first and second fuel gas supply ports 70a and 70b are provided.

As shown in FIG. 4, the first and second parallel flow paths 71A and 71B have different inner diameters Da and Db, and have a relationship of Da <Db. The inner diameter Da is the inner diameter of the flow path suitable for using LP gas as the fuel gas. The inner diameter Db is the inner diameter of the flow path suitable for using natural gas as the fuel gas.
However, the inner diameter Dc of the portion (the portion closer to the first and second fuel gas supply ports 70a and 70b) into which the convex portion 83 for sealing described later of the fuel gas flow path adjusting member 8 is fitted is the inner diameter described above. It has an inner diameter larger than that of Da and Db, and has the same dimensions.

As is often shown in FIG. 7, the inner side wall portion 51b of the pipe joint portion 51 is also provided with first and second gas type display portions 3a and 3b, and two screw holes 59. The first and second gas type display units 3a and 3b are provided near the upper side or the lower side of the first and second fuel gas supply ports 70a and 70b, respectively, and the first and second fuels thereof are provided. The gas supply ports 70a and 70b are display units indicating that they correspond to LP gas and natural gas, respectively. These are, for example, the characters "LP" and the characters "NG". However, a display mode different from this may be used.

The fuel gas flow path adjusting member 8 is a member for selectively closing any one of the first and second fuel gas supply ports 70a and 70b according to the type of fuel gas. As shown in FIG. 9, the fuel gas flow path adjusting member 8 is provided with a semicircular plate-shaped main body 80, and the main body 80 has a knob 81, a screw body insertion hole 82, and a seal. This is a configuration in which the convex portion 83 of the above is provided. As shown in FIGS. 4 and 5, a sealing O-ring 84 is externally fitted to the sealing convex portion 83.

As shown in FIGS. 4 to 6, the fuel gas flow path adjusting member 8 is attached to the inner side wall portion 51b of the pipe joint portion 51, for example, in a mode of closing the first fuel gas supply port 70a (first mounting mode). It is installed. This attachment is performed by using a screw body 98 (fastening member) such as a screw screwed into the screw hole 59. In this first mounting mode, the convex portion 83 for sealing is fitted into the first fuel gas supply port 70a, and the second gas type display portion 3b is provided by the fuel gas flow path adjusting member 8. It is obscured. The first gas type display unit 3a is not covered by the fuel gas flow path adjusting member 8 and is exposed in front of the pipe joint portion 51.

As shown in FIG. 8, the fuel gas flow path adjusting member 8 is set in a mode of closing the second fuel gas supply port 70b (second mounting mode) as a mounting mode of the pipe joint portion 51 with respect to the inner side wall portion 51b. It is also possible to do. The change from the first mounting mode to the second mounting mode is to loosen the fastening state by the screw body 98, temporarily remove the fuel gas flow path adjusting member 8 from the inner side wall portion 51b, and then adjust the fuel gas flow path. This can be done by reattaching the member 8 to the inner side wall portion 51b using the screw body 98 in an upside down posture. In the second mounting mode, contrary to the first mounting mode, the convex portion 83 for sealing is fitted into the second fuel gas supply port 70b, and the first gas type display portion 3a Is covered by the fuel gas flow path adjusting member 8, and the second gas type display portion 3b is exposed in front of the pipe joint portion 51.

Next, the operation of the premixing device A described above will be described.

First, when the fuel gas is, for example, natural gas as the environment in which the premixing device A is used, the fuel gas flow path adjusting member 8 is set as the first mounting mode as shown in FIGS. 3 to 6. .. As a result, the first parallel flow path 71A is in a state of being blocked by the fuel gas flow path adjusting member 8, and the second parallel flow path 71B is an effective flow path forming a part of the fuel gas flow path 7. Will be. The inner diameter Db of the second parallel flow path 71B corresponds to natural gas as described above. Since natural gas has a lower calorific value than LP gas, it is necessary to increase the amount of gas with respect to air as compared with the case where LP gas is used. It will be possible to respond appropriately. That is, the second parallel flow path 71B has a larger inner diameter than the first parallel flow path 71A, and the flow path resistance of the fuel gas flow path 7 can be reduced, which is caused by the air flow in the premixed flow path 40. Due to the generated negative pressure action, it is possible to allow a large amount of natural gas to flow out from the fuel gas outlet 74.

Unlike the above, when the fuel gas is LP gas, it may be changed to the second mounting mode as shown in FIG. As described above, the change from the first mounting mode to the second mounting mode can be easily and quickly performed by loosening the screw body 98 or the like. In the second mounting mode, contrary to the first mounting mode, the second parallel flow path 71B is blocked, and the first parallel flow path 71A is effective as a part of the fuel gas flow path 7. It becomes a flow path. As described above, the inner diameter Da of the first parallel flow path 71A corresponds to the LP gas. Since LP gas has a larger calorific value than natural gas, it is necessary to reduce the amount of gas with respect to air, but according to the second mounting mode, such a situation can be appropriately dealt with.

As described above, according to the present embodiment, it is not necessary to replace parts or add new parts regardless of whether the fuel gas is natural gas or LP gas, and the fuel gas flow. It is possible to appropriately cope with the type of fuel gas only by changing the mounting mode of the road adjusting member 8. Therefore, there is no problem that the number of parts in stock for corresponding to the type of fuel gas is increased, and the cost required for inventuring the parts can be reduced.
In addition, parts management becomes easy.

Further, according to the present embodiment, when the fuel gas flow path adjusting member 8 is set to the first mounting mode, the second gas type display unit 3b is obscured, but the first gas type display unit 3a is ". The word "NG" remains exposed. On the contrary, when the fuel gas flow path adjusting member 8 is set to the second mounting mode, the first gas type display unit 3a is obscured and the second gas type display unit 3b is "LP. The characters are exposed. Therefore, by confirming such a display, it is possible to easily and accurately determine whether or not the mounting mode of the fuel gas flow path adjusting member 8 is an appropriate mounting mode corresponding to the actual type of fuel gas. It is possible to do.
In addition, since the fuel gas flow path adjusting member 8 is formed in a small piece shape as a whole and is mounted inside the pipe joint portion 51, the fuel gas flow path adjusting member 8 does not become bulky and is premixed. It is also possible to suppress the increase in size of the device A.

10 to 29 show other embodiments of the present invention. In these figures, the same or similar elements as those in the embodiment are designated by the same reference numerals as those in the embodiment, and duplicate description will be omitted.

In the premixing device Aa shown in FIGS. 10 to 14, a plurality of (for example, four) parallel flow paths 71 are provided on the inner side wall portion 51b of the pipe joint portion 51, and a plurality of parallel flow paths 71 as openings thereof are provided. The fuel gas supply ports 70 are arranged concentrically. A screw hole 59 is provided in the central portion of the inner side wall portion 51b, and a plurality of positioning recesses 58 are provided around the screw hole 59.
As is well shown in FIG. 15, the fuel gas flow path adjusting member 8A is provided with a disk-shaped main body 80 having the same number of elongated hole-shaped openings 85 as the fuel gas supply port 70. Moreover, a plurality of convex portions 86 for positioning are provided so as to project on the inner surface side of the main body portion 80. When the fuel gas flow path adjusting member 8A is set in the first and second mounting modes described later, the plurality of positioning protrusions 86 are fitted into the plurality of recesses 58 to fit the fuel gas flow path adjusting member 8A. It is a part that plays a role in positioning.

As shown in FIGS. 10 to 12, the premixing device Aa of the present embodiment has a configuration in which the fuel gas flow path adjusting member 8A is attached to the inner side wall portion 51b of the pipe joint portion 51 by using a screw body 98. Will be done. However, when the fuel gas is natural gas, the fuel gas flow path adjusting member 8A is the first mounting mode shown in FIG. In this first mounting mode, the entire plurality of openings 85 are overlapped with the plurality of fuel gas supply ports 70, and the effective opening area of the plurality of fuel gas supply ports 70 is the total of the plurality of openings 85. It is in a state equal to the area of.

On the other hand, when the fuel gas is LP gas, the fuel gas flow path adjusting member 8A is the second mounting mode shown in FIG. In this second mounting mode, a part of each of the plurality of openings 85 overlaps a portion other than the fuel gas supply port 70, and the plurality of openings 85 are provided with respect to the plurality of fuel gas supply ports 70. The whole does not overlap. Therefore, in this second mounting mode, the effective opening area of the fuel gas supply port 70 is smaller than that of the first mounting mode shown in FIG. 12, and the LP gas having a large calorific value can be appropriately dealt with. do.

In order to change from the first mounting mode shown in FIG. 12 to the second mounting mode shown in FIG. 14, the screw body 98 may be loosened and the fuel gas flow path adjusting member 8A may be rotated by an appropriate angle. Further, in that case, the angle of the fuel gas flow path adjusting member 8A may be set at a position where the plurality of convex portions 86 for positioning fit into the concave portions 58. Therefore, it is easy to change the mounting mode described above.

In the premixing device Ab shown in FIGS. 16 to 19, a plurality of parallel flow paths 71 are provided on the inner side wall portion 51b of the pipe joint portion 51, and a plurality of fuel gas supply ports 70 as openings thereof are provided.
However, they are lined up so that they are located on the same circle. The parallel flow path 71 and the fuel gas supply port 70 have a smaller area than the parallel flow path 71 and the fuel gas supply port 70 of the premixing device Aa of the previous embodiment, and the number of the parallel flow paths 71 and the fuel gas supply port 70 is increased. ..
The fuel gas flow path adjusting member 8B has a configuration in which openings 85 having substantially the same shape and size as the fuel gas supply port 70 are provided in the same number as the fuel gas supply port 70. Further, a plurality of convex portions 86 that can be fitted to the plurality of positioning concave portions 58 provided in the pipe joint portion 51 are also provided.

In the premixing device Ab of the present embodiment, when the fuel gas is natural gas, the fuel gas flow path adjusting member 8B is set in the first mounting mode shown in FIG. In this first mounting mode, the entire plurality of openings 85 are overlapped with respect to the plurality of fuel gas supply ports 70, and the entire plurality of fuel gas supply ports 70 are in a state of being greatly opened. Therefore, it is suitable for natural gas with a small calorific value.
On the other hand, when the fuel gas is LP gas, the fuel gas flow path adjusting member 8B is set in the second mounting mode shown in FIG. In this second mounting mode, each fuel gas supply port 70 and each opening 85 do not overlap in a completely aligned state, and a part of each fuel gas supply port 70 is closed. Therefore, it is suitable for LP gas having a large calorific value.

Also in this embodiment, similarly to the premixing device Aa described above, the mounting mode of the fuel gas flow path adjusting member 8B can be changed by loosening the screw body 98 and rotating the fuel gas flow path adjusting member 8B. The work is easy. Further, in that case, by fitting the plurality of convex portions 86 and the concave portions 58, it is convenient because the rotation angle of the fuel gas flow path adjusting member 8B can be defined to be an accurate angle.

In the premixing device Ac shown in FIGS. 20 and 21, a plurality of parallel flow paths 71 are provided on the inner side wall portion 51b of the pipe joint portion 51, and a plurality of fuel gas supply ports 70 as openings thereof are provided. Is provided. Although the plurality of fuel gas supply ports 70 are arranged so as to be located on the same circle, they are not arranged at equal intervals, and the non-equally spaced portions 70'(the fuel gas supply ports 70 are not provided and are slightly wider. Area).
The fuel gas flow path adjusting member 8C includes a plurality of openings 85 having substantially the same shape, size, and arrangement as the plurality of fuel gas supply ports 70.

In this premixing device Ac, when the fuel gas is natural gas, the fuel gas flow path adjusting member 8C is the first mounting mode shown in FIG. 21 (a). In this first mounting mode, all of the plurality of fuel gas supply ports 70 overlap with the opening 85 and are in a state of being greatly opened. On the other hand, when the fuel gas is LP gas, the fuel gas flow path adjusting member 8C is the second mounting mode shown in FIG. 21 (b). In this second mounting mode, one opening 85 is located at the unequally spaced portion 70', and one of the plurality of fuel gas supply ports 70 is the fuel gas supply port 70 for adjusting the fuel gas flow path. It is closed by the member 8C. Therefore, even in the case of the present embodiment, it is possible to appropriately deal with either natural gas or LP gas as the fuel gas. Since the mounting mode of the fuel gas flow path adjusting member 8C may be changed by loosening the screw body 98 and rotating the fuel gas flow path adjusting member 8C, the work is still easy.

In the premixing device Ad shown in FIGS. 22 to 25, the pipe joint portion 51 is not provided with a plurality of parallel flow paths, but is provided with one hole portion 71C forming a part of the fuel gas flow path 7. There is. The opening of the hole 71C is the fuel gas supply port 70. The fuel gas supply port 70 is arranged so as to be biased in one direction (on the right side in the drawing) from the central portion of the inner side wall portion 51b of the pipe joint portion 51.
On the other hand, the fuel gas flow path adjusting member 8D has a disk-shaped main body portion 80 provided with two openings 85a and 85b having different diameters and two screw body insertion holes 82.

22 and 23 show a first mounting mode of the fuel gas flow path adjusting member 8D. In this first mounting mode, the opening 85a on the large diameter side of the fuel gas flow path adjusting member 8D overlaps the fuel gas supply port 70.
On the other hand, FIG. 25 shows a second mounting mode of the fuel gas flow path adjusting member 8D. In this second mounting mode, the small diameter side opening 85b of the fuel gas flow path adjusting member 8D overlaps the fuel gas supply port 70.
The effective opening area of the fuel gas supply port 70 is large in the first mounting mode and small in the second mounting mode, and the effect intended by the present invention can be obtained. To switch between the first and second mounting modes, the screw body 98 may be loosened, the fuel gas flow path adjusting member 8D may be removed once, and then the fuel gas flow path adjusting member 8D may be inverted and mounted again. be.
According to this embodiment, since it is not necessary to provide a plurality of parallel flow paths, the fuel gas flow path 7 can be simplified.

In the premixing device Ae shown in FIGS. 26 to 28, the pipe joint portion 51 is provided with one hole portion 71D forming a part of the fuel gas flow path 7. The hole 71D has an elongated hole shape, and the opening thereof is a fuel gas supply port 70.
On the other hand, the fuel gas flow path adjusting member 8E has a configuration in which a circular opening 85 is provided at a position deviated from the center of the disk-shaped main body 80.

FIG. 26 shows a first mounting mode of the fuel gas flow path adjusting member 8E. In this first mounting mode, the fuel gas supply port 70 faces the part of the fuel gas supply port 70 so that substantially the entire opening 85 of the fuel gas flow path adjusting member 8E faces the fuel gas flow path. It is blocked by the adjusting member 8E.
FIG. 28 shows a second mounting mode of the fuel gas flow path adjusting member 8E. In this second mounting mode, the fuel gas supply port 70 has a fuel gas flow so that only a part of the opening 85 of the fuel gas flow path adjusting member 8E faces a part of the fuel gas supply port 70. It is blocked by the road adjusting member 8E.

Also in the present embodiment, as in the above-described embodiment, the effective opening area of the fuel gas supply port 70 is large in the first mounting mode and small in the second mounting mode. The first mounting mode is suitable for natural gas, and the second mounting mode is suitable for LP gas. Further, as in the case of the premixing device Ad described above, it is not necessary to provide a plurality of parallel flow paths, and the fuel gas flow path 7 can be simplified.

In the premixing device Af shown in FIG. 29, the premixing flow path forming member 4F is configured by utilizing the first and second tubular portions 4b and 4c. An opening 40a for air inflow is provided at the base end of the first tubular portion 4b, and the inside of the first and second tubular portions 4b and 4c is a premixed flow path 40. A fuel gas outlet 74a is provided between the tip of the first tubular portion 4b and the base end of the second tubular portion 4c as a gap that opens in the premixed flow path 40. The fuel gas supplied to the pipe joint portion 51 passes through a region 72 provided between the first and second tubular portions 4b and 4c and the housing member 5F and reaches the fuel gas outlet 74a. ..
The housing member 5F is provided with a pipe joint portion 51, and the pipe joint portion 51 is provided with two parallel flow paths 71A and 71B similar to those shown in FIG. 4, for example. Further, one of the two fuel gas supply ports 70 (70a, 70b), which are the openings of the parallel flow paths 71A and 71B, can be selectively closed by the fuel gas flow path adjusting member 8. There is.

In the present embodiment, due to the flow of air through the venturi-shaped premixed flow path 40, a negative pressure is generated in the vicinity of the fuel gas outlet 74a, and the negative pressure is generated from the fuel gas outlet 74a into the premixed flow path 40. Fuel gas flows out. Unlike the above-described embodiment, the blade portion 6 provided with the fuel gas outlet 74 is not used, but it is possible to appropriately generate an air-fuel mixture mixture. The premixed flow path and the premixed flow path forming member in the present invention can also be configured as in the present embodiment.

The present invention is not limited to the contents of the above-described embodiments. The specific configuration of each part of the premixing device and the combustion device according to the present invention can be variously redesigned within the scope of the present invention.

In the above-described embodiment, the fuel gas flow path adjusting members 8, 8A to 8E are indirectly attached to the premixed flow path forming members 4, 4F via the housing members 5, 5F, but the present invention. Is not limited to this. For example, when the premixed flow path forming member is provided with a pipe joint portion for connecting a gas pipe, a configuration in which the fuel gas flow path adjusting member is attached to this portion, that is, the fuel gas flow path adjusting member is provided with the premixed flow path. It can also be configured to be directly attached to the forming member.
The specific shape, size, material, etc. of the fuel gas flow path adjusting member are not limited.
The fuel gas is not limited to natural gas and LP gas, and other types of fuel gas can be applied to the present invention.
The combustion device according to the present invention is not limited to the hot water supply device, and may be a combustion device for other purposes such as for heating and incinerator. Further, the type is not limited to the type in which the combustion gas advances downward, and the type in which the fuel gas advances, for example, may be used.

A, Aa to Af Premixing device B Combustion device 3a, 3b First and second gas type display units 4, 4F Premixing flow path forming member 40 Premixing flow path 5, 5F Housing member 51 Pipe fitting 51a Cylindrical Part (of pipe joint part)
51b Inner side wall (of pipe joint)
59 Screw holes 7 Fuel gas flow path 70 Fuel gas supply port 71 Parallel flow paths 71A, 71B First and second parallel flow paths 74,74a Fuel gas outlets 8, 8A to 8E Fuel gas flow path adjustment member 83 For sealing Convex part 9 gas pipe

Claims (9)

A premixed flow path forming member that allows air to flow from one end side to the other end side and forms a premixed flow path for mixing the fuel gas with the air.
The fuel gas supply port that receives the fuel gas supply from the outside and the fuel gas outlet that opens in the premix flow path, and the fuel gas supplied to the fuel gas supply port is the fuel gas outlet. Fuel gas flow path to guide to
It is a premixer equipped with
Further, a fuel gas flow path adjusting member that can be directly or indirectly attached to the premixed flow path forming member and can block a part of the fuel gas flow path is provided.
The mounting mode of the fuel gas flow path adjusting member can be changed, and the position and / or area of the fuel gas flow path adjusting member blocking the fuel gas flow path is changed by the change of the mounting mode. A premixing device characterized in that it is possible to change the flow path resistance of the fuel gas flow path. The premixing device according to claim 1.
A premixing device configured to allow the fuel gas to flow out from the fuel gas outlet to the premixed flow path due to the action of negative pressure generated by the air flow in the premixed flow path. The premixing device according to claim 1 or 2.
As the fuel gas, there are predetermined first and second fuel gases of different types.
As the mounting mode of the fuel gas flow path adjusting member, the first mounting mode in which the fuel gas flow path corresponds to the first fuel gas and the second mounting mode in which the fuel gas flow path corresponds to the second fuel gas. A premixer in which one of the two mounting modes can be selectively set. The premixing device according to claim 3, wherein the premixing device is used.
Further, a first gas type display unit indicating the first and second fuel gases, respectively, is provided.
When the fuel gas flow path adjusting member is set in the first mounting mode, the second gas type display unit is covered by the fuel gas flow path adjusting member, and the first gas type is covered. While the display unit is exposed, when the fuel gas flow path adjusting member is set to the second mounting mode, the first gas type display unit is covered with the fuel gas flow path adjusting member. A premixing device that is hidden and the second gas type display unit is configured to be exposed. The premixing device according to any one of claims 1 to 4.
Further, a pipe joint portion having a tubular portion having a tip opening for connecting the gas pipe for supplying the fuel gas is further provided.
The fuel gas supply port is provided on the inner side wall portion in the tubular portion, and is provided on the inner side wall portion.
The fuel gas flow path adjusting member is a premixer that is inserted into the cylindrical portion from the tip opening thereof and is attached to the inner side wall portion by using a fastening member. The premixing device according to any one of claims 1 to 5.
The portion of the fuel gas flow path near the fuel gas supply port is divided into a plurality of parallel flow paths, and a plurality of fuel gas supply ports corresponding to the plurality of parallel flow paths are provided as the fuel gas supply port. And
A premixing device in which the position and / or number of the fuel gas flow path adjusting member closing the plurality of fuel gas supply ports can be changed. The premixing device according to claim 6.
The plurality of parallel flow paths include first and second parallel flow paths having different flow path areas, and the plurality of fuel gas supply ports correspond to the first and second flow paths. Equipped with 1st and 2nd fuel gas supply ports,
The fuel gas flow path adjusting member is a premixing device capable of selectively closing one of the first and second fuel gas supply ports. The premixing device according to claim 7.
Of the first and second parallel flow paths, the portions near the first and second fuel gas supply ports have the same shape and size.
The fuel gas flow path adjusting member is a premixer having a convex portion for a seal that can be fitted into a portion near the first and second fuel gas supply ports. A combustion device comprising the premixing device according to any one of claims 1 to 8.

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