JP2010107174A - Combustor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustor that stabilizes an air-fuel ratio even if a mounting part of a blower fan breaks causing an air leak. <P>SOLUTION: The combustor 1 includes the blower fan 11, a pressure governing means 16 for reducing the pressure of fuel gas, a combustion part 15 for generating flames, and a passage forming member 12 for connecting the blower fan 11 to the combustion part 15. The passage forming member 12 is partly connected to an outlet side of the pressure governing means 16. The pressure governing means 16 is configured to output the fuel gas by pressure reduction from a primary pressure to a secondary pressure depending on a predetermined signal pressure, and the signal pressure is sampled downstream of the mounting part of the blower fan 11 on the passage forming member 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a combustion apparatus, and more particularly, to a combustion apparatus that can stabilize the air-fuel ratio even when the attachment portion of the blower fan is damaged and air leaks.

  2. Description of the Related Art Conventionally, a combustion apparatus that burns gas, liquid fuel, or the like is frequently used as a heat source for a water heater or a bath apparatus. In general, a combustion apparatus mixes fuel and air and burns them in a flame hole provided in a combustion section. For example, a premix combustion burner is preliminarily provided with fuel inside a combustion apparatus (mixing section). Air is mixed and burned in the flame hole. In the premixed combustion burner, the fuel gas and primary air are mixed in the mixing section, and further, the Bunsen burner burns with additional mixing of the secondary air during combustion in the flame hole, and the fuel gas and combustion in the mixing section There is an all primary premix burner that mixes and burns all the necessary air.

  By the way, in general, a combustion apparatus employing a premix type burner is provided with a blower fan for supplying primary air. And such a combustion apparatus supplies the fuel gas according to the pressure of the air which a ventilation fan sends out to a mixing part, and a mixed gas is produced | generated. Therefore, a stable air-fuel ratio of the mixed gas is important for combustion in the flame holes. That is, in the case of a premixed type burner, there is a concern that unstable combustion may occur in the flame hole if the air-fuel ratio of the fuel gas and the combustion air is not adjusted to an appropriate range.

Patent Document 1 discloses a combustion apparatus that employs an all-primary premix type burner and can adjust the air-fuel ratio of fuel and combustion air in the mixing section to an appropriate range.
JP 2000-146163 A

  However, in the combustion apparatus described in Patent Document 1, the fuel and the combustion air may be burned in the flame hole without being adjusted to an air / fuel ratio in an appropriate range. Specifically, as shown in FIG. 6, in the conventional combustion apparatus 101, since the air pressure signal is introduced from the vicinity of the outlet of the blower fan 111, the mounting portion of the blower fan 111 is damaged and only air leaks. In this case, there is a problem that the air-fuel ratio of the fuel and the combustion air deviates from an appropriate range.

  That is, in the case of the combustion apparatus 101 having the above-described configuration, the air pressure that is a signal is detected in the vicinity of the outlet of the blower fan 111 even when air leaks at the connection portion between the mixing unit 112 and the blower fan 111. The air pressure is substantially equal to the output of the blower fan 111. And the fuel of the secondary pressure according to the detected air pressure is discharged | emitted. Therefore, there is a difference between the actual air pressure that is a signal of the secondary pressure of the fuel and the air pressure that is reduced due to the leakage mixed with the fuel, and the air-fuel ratio is disturbed. In other words, the secondary pressure fuel supplied according to the air pressure does not take into account the reduced air pressure due to the above problem, and the fuel discharged according to the decompressed air pressure and the undecompressed air pressure is Of course, the air-fuel ratio will deviate. That is, in the case of the conventional combustion apparatus 101, when such a problem occurs, the air-fuel ratio of the fuel and air at the secondary pressure is out of the proper range, and the combustion unit 115 may become unstable combustion. Since the combustion apparatus described in Patent Document 1 also has the same configuration, when the above-described malfunction occurs, there is a problem that the air-fuel ratio is disturbed and an unstable combustion occurs.

  In view of the above-described problems of the prior art, an object of the present invention is to provide a combustion apparatus that can stabilize the air-fuel ratio even when the mounting portion of the blower fan is damaged and air leaks.

  The invention according to claim 1 for solving the above-mentioned problem has a blower fan, a pressure adjusting means for reducing the pressure of the fuel gas, a combustion part for generating a flame, and a flow path forming member. The member connects the blower fan and the combustion part, and is a part of the flow path forming member, and the discharge side of the pressure adjusting means is connected between the blower fan and the combustion part, thereby forming a flow path in the ventilation state. In the combustion apparatus in which a mixed gas of fuel gas and air is sent to the combustion section and used for combustion in the member, the pressure adjusting means responds to a predetermined signal pressure with the fuel gas supplied with a primary pressure. The signal pressure is discharged after being reduced to a secondary pressure, and the signal pressure is a part of the flow path forming member and is collected from a position downstream of the attachment portion of the blower fan and introduced into the pressure adjusting means. It is a combustion apparatus characterized by this.

  In the combustion apparatus of the present invention, the signal pressure of the air sent out from the blower fan is sampled from the position downstream of the blower fan mounting part and introduced into the pressure adjusting means, so that a problem occurs in the blower fan mounting part. However, the air-fuel ratio of the air mixed with the flow path forming member and the fuel gas is not disturbed. That is, even when the air sent out from the attachment part of the blower fan leaks, the signal pressure is introduced into the pressure adjusting means from a position downstream from the attachment part. Instead, the secondary pressure fuel gas corresponding to the signal pressure of the air sent to the combustion section is discharged. As a result, the air-fuel ratio of the mixed gas falls within an appropriate range, and combustion in the combustion section is stabilized.

  The invention according to claim 2 is the combustion apparatus according to claim 1, wherein the signal pressure is collected from the upstream side of the position where the discharge side of the pressure regulating means in the flow path forming member is connected. It is.

  In the combustion apparatus of the present invention, since the signal pressure is collected from the upstream side of the position where the discharge side of the pressure adjusting means is connected, there arises a problem that the signal pressure is mixed with the combustion gas discharged from the pressure adjusting means. Absent. Therefore, a more accurate signal pressure is introduced into the pressure adjusting means.

  According to a third aspect of the present invention, a resistance member is provided inside the flow path forming member, and the resistance member is connected to a downstream side of a position where the signal pressure is collected and to a discharge side of the pressure adjusting means. The combustion apparatus according to claim 1, wherein the combustion apparatus is disposed upstream of the first position.

  In the combustion apparatus of the present invention, a resistance member that resists the flow of air sent from the blower fan is provided inside the flow path forming member, and the resistance member is downstream from the position where the signal pressure is collected. The air pressure acting as the dynamic pressure can be collected because it is arranged on the side and upstream of the position where the discharge side of the pressure adjusting means is connected. That is, when the resistance member is not provided, since the air pressure is introduced as a static pressure, the air pressure of the blower fan is introduced to the pressure adjusting means as a signal that is extremely smaller than the actual value. Since dynamic pressure is introduced into the air pressure, the air pressure sent from the blower fan is introduced as a signal close to a substantial value. Thereby, since the fuel gas of the secondary pressure according to the air pressure of the actual value of a ventilation fan can be discharged | emitted, more efficient combustion is attained.

  The invention according to claim 4 is the combustion apparatus according to claim 3, wherein the resistance member has a donut shape along an inner diameter of the flow path forming member.

  In the combustion apparatus of the present invention, since the resistance member has a donut shape along the inner diameter of the mixing member, the air sent from the blower fan tends to act as dynamic pressure. That is, since the resistance member has a donut shape, the air sent from the blower fan can escape only to the central hole. As a result, the resistance to the air increases, so that the air is likely to act on the dynamic pressure, and the signal pressure collected from the vicinity of the resistance member is reliably introduced to the pressure adjusting means as the dynamic pressure.

  According to a fifth aspect of the present invention, in the flow path forming member, almost all air necessary for combustion can be mixed by a blower fan, and the signal pressure is collected from the side or the upper side of the flow path forming member. The combustion apparatus according to any one of claims 1 to 4, wherein

  In the combustion apparatus of the present invention, since almost all the air necessary for combustion is mixed with the fuel gas by the blower fan in the flow path forming member, the air-fuel ratio can be easily adjusted and stable combustion can be performed. Further, since the signal pressure is collected from the side or the upper side of the flow path forming member, the dust mixed into the flow path forming member when the flow rate of air sent from the blower fan becomes weak or the combustion device is stopped. It is possible to prevent the dust and the like from falling and collecting and affecting the collection of the signal pressure.

  In the combustion apparatus of the present invention, since the signal pressure is collected from the downstream side of the attachment portion of the blower fan, the reduced signal pressure is regulated even when the attachment portion of the blower fan is damaged and air leaks. Since it is introduced into the means, the fuel gas discharged from the pressure regulating means is also decompressed. Thereby, since the air fuel ratio of the mixed gas supplied to a combustion part can be stabilized, a highly safe combustion apparatus can be provided.

  Hereinafter, preferred embodiments for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a combustion apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view showing a combustion apparatus according to an embodiment of the present invention. FIG. 3 shows a part of the combustion apparatus according to the embodiment of the present invention, and is a perspective view in which the heat exchanger and the mixed gas passage member are removed. 4 is an α-α cross-sectional view showing the mixing member of FIG.

  In the combustion apparatus 1 shown in FIG. 1, the air from the blower fan 11 and the secondary pressure fuel gas depressurized to a predetermined pressure are mixed by the flow path forming member 12, and the generated mixed gas is the combustion section. 15 is supplied and burned.

  As shown in FIG. 1, the combustion apparatus 1 of the present embodiment includes a blower fan 11 that sends out combustion air, a flow path forming member 12 through which fuel gas and combustion air flow, and a combustion gas from a primary pressure to a secondary pressure. It comprises a zero governor (pressure adjusting means) 16 for adjusting the pressure, a heat exchanger 14 wound in a cylindrical shape, and a cylindrical combustion section 15 (shown in FIG. 5) disposed therein. .

  As shown in FIG. 2, the blower fan 11 is similar to a known one, and has a fan main body portion 31 whose appearance is formed in a spiral shape and a blowout portion 32 whose opening shape is a quadrangle (not shown). The air is sent out by rotation of a motor (not shown). A circular flange 37 projecting outward from the outer diameter of the blowout portion 32 is attached to the end of the blowout portion 32 and is connected to the mixing member 24 described later. The flange 37 is provided with four screw holes 61 penetrating in the thickness direction.

  As shown in FIG. 3, the flow path forming member 12 connects the blower fan 11 and a combustion unit 15 to be described later, and includes a mixing member 24 and a mixed gas flow path member 25. The mixing member 24 includes a mixing main body 35 formed by processing a metal such as stainless steel into a cylindrical shape, and a flange 36 provided at one end of the mixing main body 35. The flange 36 has a circular shape larger than the outer diameter of the mixing main body 35 and is integrally formed with the mixing main body 35. The other end of the mixing main body 35 has an outer diameter that is substantially the same as the outer diameter of the flange 37 of the blower fan 11 described above. Specifically, the mixing main body 35 has a thickness sufficient to form the female screw 63, and the female screw 63 and the screw hole 61 of the flange 37 communicate with each other to insert the screw 62. Are fixed.

  As shown in FIG. 1, a resistance member 17 that protrudes from the inner diameter of the mixing member 24 toward the center is provided inside the mixing member 24. The resistance member 17 is made of a synthetic resin or the like, and has a donut shape formed along the inner diameter of the mixing member 24 as shown in FIG. That is, the mixing member 24 has the center hole 42, and the center hole 42 and the openings at both ends of the mixing member 24 are in communication.

  The mixing member 24 is connected to a signal pressure pipe 23 that introduces a signal pressure into the zero governor 16 described later and a fuel gas discharge pipe 22 that discharges a secondary pressure fuel gas in accordance with the signal pressure. Therefore, the mixing member 24 is provided with a signal pressure tube attachment port 43 and an exhaust gas attachment port 44 (FIG. 1). The signal pressure pipe attachment port 43 is disposed on the upstream side of the mixing member 24, and the exhaust gas attachment port 44 is disposed on the downstream side of the mixing member 24. That is, since the pressure of the fuel gas discharged from the zero governor 16 is not added to the air pressure of the blower fan 11 collected from the signal pressure pipe attachment port 43, only the air pressure is collected as the signal pressure. Further, as shown in FIG. 2, the signal pressure pipe attachment port 43 is located on the side surface of the mixing member 24 and is disposed so that dust and dust mixed in the mixing member 24 do not accumulate.

  The resistance member 17 is disposed downstream of the signal pressure tube attachment port 43 and upstream of the exhaust gas attachment port 44 (between the connection portion of the signal pressure tube 23 and the connection portion of the fuel gas discharge tube 22). Therefore, it is possible to collect the dynamic pressure of air as the signal pressure in the signal pressure pipe 23.

  As shown in FIG. 2, the mixed gas flow path member 25 is a rectangular casing whose outer appearance is rounded, and has a plate-shaped lid portion 45 and a box-shaped flow path main body portion 46. The lid portion 45 is provided with twelve semicircular convex portions 48 projecting in the short direction or the longitudinal direction on the outer periphery, and each convex portion 48 has a screw hole penetrating one by one in the thickness direction. 47 is formed.

  The flow path body 46 is provided with a semi-cylindrical protrusion 49 having a cross-sectional shape substantially the same as the shape of the protrusion 48 described above on the frame-shaped side wall. In this case, the convex portions 48 overlap each other. Further, a screw hole 50 is formed in the protrusion 49 at a position corresponding to the screw hole 47. That is, the lid portion 45 and the flow channel main body portion 46 are fixed by connecting the screw holes 47 and 50 and inserting screws (not shown).

  As shown in FIG. 3, flow passage holes 51 and 52 that penetrate in the thickness direction of the member are provided inside the flow passage main body 46 as shown in FIG. 3. The channel hole 51 is a circular hole having a diameter larger than that of the channel hole 52. Further, circular flange portions 53 and 54 having a reference point substantially equal to the center of the channel hole 51 or the center of the channel hole 52 are provided at positions facing the lid portion 45. The flange portion 54 is substantially the same size as the flange portion 36 of the mixing member 24 described above, and is overlapped and fixed with screws or the like. The flange portion 53 is connected to the combustion portion 15 described later. The flange portions 53 and 54 have a circular hole having a diameter similar to that of the channel hole 51 or the channel hole 52 so that the mixed gas passes therethrough.

  As shown in FIG. 3, the combustion section 15 includes a fixed section 38 connected to the mixed gas flow path member 25 and a flame hole section 39 in which a mixed gas of fuel gas and combustion air is burned. The fixed portion 38 is disc-shaped, and is provided with four semicircular convex portions 55 protruding in the outer diameter direction, and each convex portion 55 is provided with one screw hole 56. . Further, at the center of the fixed portion 38, there is a channel hole 57 having the same size as the channel hole 51 of the mixed gas channel member 25. That is, the mixed gas flow path member 25 and the combustion section 15 are connected by connecting the flow path hole 51 and the flow path hole 57 with the flange 53 interposed therebetween, and inserting screws (not shown) or the like. As a result, the mixed gas passes through the communicating flow path holes 51 and 57 and is supplied to the flame hole portion 39. The fixed portion 38 has a larger diameter than the flange portions 53 and 54 of the mixed gas flow path member 25.

  The flame hole portion 39 is cylindrical and has substantially the same diameter as the flow path hole 57. In the combustion apparatus 1 of the present invention, the cylindrical shaft of the flame hole portion 39 is disposed horizontally. Therefore, when the mixed gas is supplied to the combustion unit 15, the flame is emitted from the flame holes provided on the circumference of the flame hole part 39 with the flame hole part 39 inclined in the horizontal direction.

  And as shown in FIG. 2, the heat exchanger 14 wound by the cylindrical shape is provided so that the combustion part 15 may be covered. The heat exchanger 14 has a fixing portion 58 at one end, and the fixing portion 58 and the fixing portion 38 of the combustion portion 15 are overlapped and connected by screws (not shown) or the like. The fixing portion 58 has a larger diameter than the fixing portion 38.

  As shown in FIG. 1, the zero governor (pressure adjusting means) 16 discharges a fuel gas having a regulated secondary pressure with a fuel gas supply pipe 26 connected to a gas supply source for supplying a fuel gas having a primary pressure. A fuel gas discharge pipe 22 and a signal pressure pipe 23 are connected. That is, the fuel gas reduced to the secondary pressure in the zero governor 16 is discharged to the mixing member 24 and mixed with air inside the mixing member 24.

  In the combustion apparatus 1 of the present invention, when the air sent out from the blower fan 11 is collected from the signal pressure tube 23 connected to the mixing member 24 and introduced into the zero governor 16, the pressure is approximately the same as the signal pressure of the air. The regulated fuel gas is discharged from the zero governor 16. That is, the combustion apparatus 1 of the present embodiment can stabilize the air-fuel ratio between the fuel gas adjusted to the secondary pressure by the zero governor 16 and the primary air delivered from the blower fan 11.

Hereinafter, the zero governor (pressure adjusting means) 16 employed in the present embodiment will be described in detail.
As shown in FIG. 2, the zero governor 16 employed in the present embodiment is a kind of pressure reducing valve, and reduces the pressure (primary pressure) of the gas supplied from the gas supply source to a predetermined pressure (secondary pressure). Device. However, a general pressure reducing valve regulates the secondary pressure to a set constant pressure, whereas the zero governor 16 employed in the present embodiment is different in that the discharge pressure varies according to the signal pressure.
That is, in the general pressure reducing valve, the secondary pressure is constant, whereas in the zero governor 16 employed in this embodiment, the secondary pressure varies depending on the signal pressure. More specifically, the zero governor 16 employed in the present embodiment has a signal pressure introduction port y, and the secondary pressure varies according to the pressure of the gas introduced from the signal pressure introduction port y. In particular, in the present embodiment, the secondary pressure is adjusted so as to be equal to the pressure of gas introduced from the signal pressure introduction port y (signal pressure).

FIG. 5 is a schematic configuration diagram of a zero governor employed in the present embodiment.
The zero governor 16 employed in the present embodiment is a pilot type zero governor and includes a main valve A and an auxiliary valve (pilot valve) B. In the zero governor 16, a main flow path D and an auxiliary flow path E are provided, a main valve A is provided in the main flow path D, and an auxiliary valve B is provided in the auxiliary flow path E.

  Here, the main flow path D is a flow path from the gas introduction port c to the gas discharge port d of the zero governor 16, and is a flow path through which the gas supplied from the gas supply source is decompressed and discharged.

  As shown in FIG. 5, the main flow path D is a series of flow paths configured by an introduction path e connected to the gas inlet c, a parallel path f, and a discharge path g. The introduction path e and the parallel path f communicate with each other through the first opening h, and the parallel path f and the discharge path g communicate with each other through the second opening i.

  The main valve A is a valve operated by the diaphragm a, and is provided in the main flow path D of gas. Specifically, the main valve A is provided in the second opening i of the main flow path D, and adjusts the opening degree of the second opening i. That is, the main valve A increases or decreases the passage area of the main flow path D. When the main valve A operates in the closing direction, the secondary pressure decreases, and when the main valve A operates in the opening direction, the secondary pressure increases. .

  The main valve A is operated by the diaphragm a as described above. That is, there is a working pressure chamber j having the diaphragm a as one of the constituent walls on one side of the diaphragm a. The other side of the diaphragm a is pressed by a spring u. Therefore, the diaphragm a moves and the main valve A moves so that the pressure in the working pressure chamber j and the pressing force of the spring u are in harmony.

The auxiliary flow path E is a part of the main flow path D branched, and communicates with one working pressure chamber j partitioned by the diaphragm a. Further, a part of the auxiliary flow path E is further branched to form a leak flow path k.
That is, the auxiliary flow path E is a flow path that reaches the working pressure chamber j through the branch chamber m and the pressure regulating chamber n.
More specifically, the branch chamber m communicates with the opening o provided in the parallel path f of the main flow path D, and the opening p in the branch chamber m and the opening q in the pressure regulating chamber n are indicated by a one-dot chain line. It communicates with a conduction path. Further, the opening r in the pressure regulating chamber n and the opening s in the working pressure chamber j are communicated with each other through a one-dot chain line conduction path.
As a result, a series of auxiliary flow paths E that reach the parallel path f, the opening o, the branch chamber m, the opening p, the pressure regulating chamber n, the opening q, the opening r, the opening s, and the working pressure chamber j are formed.
In addition, a leak opening t is provided in a part of the pressure regulating chamber n, and the leak opening t communicates with the discharge path g of the main flow path D through the leak flow path k. The leak opening t is a very small hole.

  The auxiliary valve B is a valve operated by the diaphragm b, and is provided in the leak opening t of the pressure regulating chamber n. That is, the auxiliary valve B adjusts the opening degree of the leak opening t and adjusts the pressure in the pressure regulating chamber n. In other words, the auxiliary valve B increases or decreases the passage area of the leak opening t. When the auxiliary valve B operates in the closing direction, the pressure in the pressure regulating chamber n increases, and when the auxiliary valve B operates in the opening direction, the pressure is regulated. The pressure in chamber n drops.

The diaphragm b has a secondary pressure acting on one wall surface and a signal pressure acting on the other wall surface, and operates according to the magnitude of the secondary pressure and the signal pressure.
That is, there is a signal pressure chamber v having the diaphragm b as one of the constituent walls on one side of the diaphragm b. The signal pressure chamber v communicates with the signal pressure introduction port y.
A secondary side communication chamber w is provided on the other side of the diaphragm b. Here, the secondary side communication chamber w communicates with the discharge path g of the main flow path D through the secondary side communication path x. A secondary pressure of zero governor is applied to the secondary side communication chamber w.

  Accordingly, the diaphragm b has a signal pressure chamber v on one side and a secondary side communication chamber w on the other side so that the pressure in the signal pressure chamber v and the pressure in the secondary side communication chamber w are in harmony. Move to. Further, since the signal pressure is applied to the signal pressure chamber v by the gas introduced from the signal pressure introduction port y, and the secondary pressure is applied to the secondary side communication chamber w, the diaphragm b has the signal pressure and the secondary pressure. Move to harmonize.

Further, the zero governor 16 employed in the present embodiment includes a first electromagnetic valve z and a second electromagnetic valve Z. The first electromagnetic valve z is provided in the first opening h of the main flow path D and opens and closes the main flow path D itself.
The second electromagnetic valve Z is provided in the opening o and opens and closes the auxiliary flow path E.

Next, the operation of the zero governor 16 employed in this embodiment will be described.
The zero governor 16 is used with the gas inlet c connected to the gas supply source and the gas outlet d connected to the load side.
The signal pressure inlet y is connected to a desired signal supply source.
The first solenoid valve z and the second solenoid valve Z are used in an open state. Therefore, both the main channel D and the auxiliary channel E are open.

The fuel gas flows through the main flow path D described above. That is, the fuel gas enters the introduction path e from the gas introduction port c and further flows through the parallel path f. And it flows into the discharge path g through the 2nd opening i, and is discharged | emitted from the gas discharge port d.
Here, since the main valve A is provided in the second opening i, the flow rate of the gas flowing through the discharge passage g is controlled by the main valve A. That is, the gas pressure upstream of the second opening i is a primary pressure and is the same pressure as the gas supply source, but the pressure downstream of the second opening i is reduced to a low pressure.

On the other hand, the gas flowing through the auxiliary flow path E flows into the working pressure chamber j through the branch chamber m.
However, since the pressure adjusting chamber n is provided with the leak opening t, the pressure in the working pressure chamber j depends on the opening degree of the leak opening t.
That is, when the leak opening t is closed, the auxiliary flow path E becomes the same pressure (primary pressure) as the pressure on the high pressure side (upstream side of the second opening i) of the main flow path D. On the other hand, when the leak opening t is opened, the gas in the pressure regulation chamber n leaks from the leak opening t, flows through the leak flow path k, and is discharged to the discharge path g side of the main flow path D. The pressure in n decreases.
An auxiliary valve B is provided in the leak opening t, and the auxiliary valve B is operated by the diaphragm b. The diaphragm b is located between the signal pressure chamber v and the secondary side communication chamber w as described above. The pressure in the signal pressure chamber v and the pressure in the secondary side communication chamber w move so as to match. That is, the diaphragm b moves so that the signal pressure and the secondary pressure are in harmony.

  Therefore, for example, when the signal pressure rises, the pressure in the signal pressure chamber v rises and the diaphragm b expands downward in the drawing, and the auxiliary valve B is pushed down to narrow the opening of the leak opening t. As a result, the flow rate of the gas leaking from the leak opening t decreases, and the pressure in the pressure regulating chamber n increases. Therefore, the pressure in the working pressure chamber j communicating with the pressure regulating chamber n rises, the diaphragm a bulges against the force of the spring u, pushes up the main valve A to increase the opening of the second opening i, The pressure (secondary pressure) on the low pressure side (downstream side of the second opening i) is increased by increasing the flow rate of the gas passing through the second opening i. That is, when the signal pressure increases, the secondary pressure increases.

  The same applies when the secondary pressure drops for some reason, the pressure in the secondary side communication chamber w drops, the diaphragm b bulges down in the drawing, the auxiliary valve B is pushed down, and the diaphragm b goes down in the drawing. The auxiliary valve B is pushed down to narrow the opening of the leak opening t. As a result, the flow rate of the gas leaking from the leak opening t decreases, the pressure in the pressure regulating chamber n and the working pressure chamber j rises, the diaphragm a bulges against the force of the spring u, and the main valve A opens. The pressure of the second opening i is increased to increase the pressure on the low pressure side (downstream side of the second opening i). That is, when the secondary pressure decreases, the main valve A moves in a direction for correcting the secondary pressure and increases the secondary pressure.

  Conversely, when the signal pressure decreases, the pressure in the signal pressure chamber v decreases, and is pushed by the pressure in the secondary side communication chamber w, the diaphragm b moves to the upper side of the drawing, opens the auxiliary valve B, and opens from the leak opening t. Is increased, and the pressure in the pressure regulating chamber n is decreased. As a result, the pressure in the working pressure chamber j communicating with the pressure regulating chamber n decreases, the diaphragm a is pushed by the force of the spring u and moves downward in the drawing, the main valve A is lowered, and the second opening i The opening degree is lowered, the flow rate of the gas passing through the second opening i is decreased, and the pressure on the low pressure side (downstream side of the second opening i) is lowered. That is, when the signal pressure decreases, the secondary pressure also decreases accordingly.

  The same applies to the case where the secondary pressure rises. The pressure in the secondary side communication chamber w rises and the diaphragm b moves upward in the drawing, pushes up the auxiliary valve B, pushes up the auxiliary valve B, and opens the leak opening t. Open the opening. As a result, the flow rate of the gas leaking from the leak opening t increases, the pressure in the pressure regulating chamber n and the working pressure chamber j decreases, the diaphragm a moves to the lower side of the drawing, the main valve A is lowered, and the second The opening degree of the opening i is lowered, and the pressure on the low pressure side (downstream side of the second opening i) is lowered. That is, when the secondary pressure rises, the main valve A moves in a direction to correct this, and the secondary pressure is lowered.

  Next, the combination structure of the combustion apparatus 1 which concerns on this embodiment is demonstrated using drawing.

  In the combustion apparatus 1 of the present embodiment, the combustion unit 15 is connected to one end of the mixed gas flow path member 25, and the blower fan 11 is connected to the other end via the mixing member 24. Specifically, the flange portion 53 of the mixed gas flow path member 25 is arranged on the side facing the flame hole section 39 with respect to the fixed section 38 of the combustion section 15, and the flow path hole 51 and the flow path hole 57 communicate with each other. It is connected.

  As shown in FIG. 1, the flange portion 36 of the mixing member 24 is overlapped with the flange portion 54 of the mixed gas flow path member 25 and is connected by connecting the flow path hole 52 and the opening of the mixing member 24 (first). 1 connection). And the flange part 37 of the ventilation fan 11 is distribute | arranged and connected to the edge part which opposes the flange part 36 of the mixing member 24 (2nd connection). At the positions of the first connection and the second connection, a load is continuously applied due to the weight of the blower fan 11, the vibration of the motor, and the like, so that the connection becomes unstable and the amount of blown air may decrease. That is, when the second connection becomes unstable, the signal pressure corresponding to the leaked air pressure is reduced, so that the fuel gas supplied as a result is also reduced accordingly. Thereby, in the mixing member 24, the mixing ratio of air and fuel gas is stabilized. The signal pressure tube attachment port 43 and the exhaust gas attachment port 44 (FIG. 1) of the mixing member 24 protrude in the horizontal direction and are in a positional relationship facing the axis of the mixing member 24.

  In the mixing member 24, one end of the signal pressure tube 23 is connected to the signal pressure tube attachment port 43, and the other end of the signal pressure tube 23 is connected to the signal pressure introduction port y of the zero governor 16. One end of the fuel gas discharge pipe 22 is connected to the exhaust gas attachment port 44, and the other end of the fuel gas discharge pipe 44 is connected to the gas discharge port d of the zero governor 16. The zero governor 16 is connected to a fuel gas supply pipe 26 for supplying a primary pressure fuel gas.

  Therefore, according to the combustion apparatus 1 of the present invention, the signal pressure pipe attachment port 43 and the signal pressure pipe 23 for collecting the air pressure of the blower fan 11 are arranged on the downstream side of the blower fan 11, that is, the mixing member 24. Even when the mounting portion of the fan 11 is damaged and the air pressure sent to the mixing member 24 is reduced, the reduced signal pressure collected in the signal pressure pipe mounting port 43 is introduced into the zero governor 16. Thereby, in the zero governor 16, the fuel gas is regulated and discharged in accordance with the signal pressure, so that the gas to be mixed has a stable air-fuel ratio.

  Further, since the mixed gas is generated inside the mixing member 24, the portion that causes the air-fuel ratio to be disturbed can only be upstream from the mixing member 24, and the mixed gas leaks downstream from the mixing member 24. However, it does not lead to the disturbance of the air-fuel ratio. In the conventional combustion apparatus, since the signal pressure of air is collected near the outlet of the blower fan, the connection portion between the blower fan and the mixing member may cause the air-fuel ratio to be disturbed.

  That is, in the case of the combustion apparatus 1 having the above-described configuration, the mixing member 24 is provided with the signal pressure pipe mounting port 43 for collecting the signal pressure of air, and thus there is a problem in mounting the blower fan 11 and the mixing member 24. Even in this case, since the air-fuel ratio of the mixed gas supplied to the combustion unit 15 is within an appropriate range, combustion is stabilized. Therefore, the combustion apparatus 1 of the present invention has high safety and can be used with peace of mind by the user.

  In the combustion apparatus 1 according to the present embodiment, the configuration in which the signal pressure tube attachment port 43 is arranged on the side surface of the mixing member 24 is shown, but the present invention is not limited to this, and the configuration is arranged on the upper surface side. It doesn't matter. In other words, it may be a position where dust or dirt does not accumulate.

  In the combustion apparatus 1 according to the present embodiment, the flow path forming member 12 includes the mixing member 24 and the mixed gas flow path member 25, but the present invention is not limited to this. For example, the mixing member 24 and the mixed gas flow path member 25 may be integrally formed.

  In the combustion apparatus 1 according to the present embodiment, the shape of the mixed gas flow path member 25 is a substantially rectangular casing, but the present invention is not limited to this, and may be cylindrical.

It is a schematic block diagram which shows the combustion apparatus which concerns on embodiment of this invention. It is a perspective view which shows the combustion apparatus which concerns on embodiment of this invention. FIG. 2 is a perspective view showing a part of the combustion apparatus according to the embodiment of the present invention, with a heat exchanger and a mixed gas flow path member with lids removed. FIG. 4 is an α-α cross-sectional view showing the mixing member of FIG. 3. It is a schematic block diagram which shows the zero governor employ | adopted by this embodiment. It is a schematic block diagram which shows the combustion apparatus of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combustor 11 Blower fan 12 Flow path formation member 15 Combustion part 16 Zero governor (pressure regulation means)
17 resistance member 21 air pressure detection tube 22 fuel gas discharge tube 23 signal pressure tube 24 mixing member 25 mixed gas flow path member

Claims (5)

A blower fan, pressure adjusting means for decompressing the fuel gas, a combustion part for generating a flame, and a flow path forming member,
The flow path forming member connects the blower fan and the combustion unit,
The discharge side of the pressure adjusting means is connected between the blower fan and the combustion part, which is a part of the flow path forming member,
In the combustion device in which the mixed gas of fuel gas and air is sent to the combustion part and used for combustion in the flow path forming member in the ventilation state,
The pressure adjusting means discharges the fuel gas supplied with a primary pressure by reducing the fuel gas to a secondary pressure corresponding to a predetermined signal pressure,
The combustion apparatus, wherein the signal pressure is a part of the flow path forming member and is collected from a position downstream of the blower fan mounting portion and introduced into the pressure adjusting means.   2. The combustion apparatus according to claim 1, wherein the signal pressure is collected from an upstream side of a position where a discharge side of the pressure adjusting means in the flow path forming member is connected. A resistance member is provided inside the flow path forming member,
The combustion apparatus according to claim 1 or 2, wherein the resistance member is disposed downstream from a position where the signal pressure is collected and upstream from a position where the discharge side of the pressure adjusting means is connected. .   The combustion apparatus according to claim 3, wherein the resistance member has a donut shape along an inner diameter of the flow path forming member. In the flow path forming member, almost all the air necessary for combustion can be mixed by the blower fan,
The combustion apparatus according to any one of claims 1 to 4, wherein the signal pressure is collected from a side or an upper side of the flow path forming member.

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