JP2012097940A - Fuel supply head and combustion device provided therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel supply head allowing the entire size to be properly reduced while using a pressure regulating valve of a type which is called a pressure equalizing valve.SOLUTION: In the pressure regulating valve provided on a fuel supply head H, a main pressure regulating valve Va and an auxiliary pressure regulating valve Vb are combined, the main pressure regulating valve Va is configured such that a diaphragm D1 is arranged in a first space part R1 surrounded by a recess 35 formed on a base material 3 and a cover 34 therefor, and a base member 3 is provided with a hole 36 for pressure transmission communicating with at least one of a primary side flow path 4a and a secondary side flow path 4b, and one end thereof is opened to an outer surface of the base member 3. The auxiliary pressure regulating valve Vb has members 77a, 77b forming a second space R2 with the diaphragm D1 arranged therein, the members 77a, 77b are attached to an opening part of the hole 36, and the second space R2 communicates with the hole 36.

Description

  The present invention relates to a fuel supply head suitable for use in, for example, an application of supplying fuel gas to a gas burner of a gas hot water supply apparatus, and a combustion apparatus including the same.

  The present applicant has previously proposed the one described in Patent Document 1 as an example of the fuel supply head. The fuel supply head described in this document is for supplying fuel gas to a burner provided in a hot water supply device or the like, and has a nozzle head and a base member connected to the nozzle head. Yes. The nozzle head has a plurality of nozzles for ejecting fuel gas, and is configured as a manifold having a plurality of flow passages formed therein for distributing and supplying fuel gas to the plurality of nozzles. The nozzle head is provided with a plurality of electromagnetic on-off valves for turning on / off the fuel supply to the plurality of nozzles and an electromagnetic flow rate adjusting valve. In addition, an electromagnetic on-off valve that serves as a main valve is also attached to the base member. According to such a configuration, since a plurality of types of valves are collectively attached to the fuel supply head, the overall size can be reduced.

  However, in the prior art, an electromagnetic flow rate adjusting valve is used as means for controlling the amount of fuel gas supplied to the burner. On the other hand, as means for controlling the fuel gas supply amount, there is also means for using a pressure regulating valve of a type called a so-called pressure equalizing valve (see, for example, Patent Document 2). The pressure regulating valve used in this means has a pressure receiving diaphragm, and receives a discharge pressure of a fan that supplies combustion air to the burner as a signal pressure by the diaphragm, thereby providing a fuel supply pressure (secondary pressure). ) Is controlled to a pressure corresponding to the discharge pressure of the fan. According to such means, there is an advantage that electronic control is not required and operation reliability is high when the air-fuel ratio is constant when the burner is driven and burned. There is a strong demand for it.

  However, the pressure regulating valve as described above requires a relatively large area for the pressure receiving diaphragm, and its size tends to be larger than that of the electromagnetic flow regulating valve. Therefore, simply attaching such a pressure regulating valve to the nozzle head as in the above-described prior art leads to an increase in the size of the entire fuel supply head, and this can be avoided appropriately. Is required. In this case, it is also desired to avoid as much as possible disadvantages such as a complicated structure.

JP 2004-271061 A JP 2007-107865 A

  The present invention has been conceived under the circumstances as described above, and a fuel supply capable of appropriately reducing the overall size while using a pressure regulating valve of a type called a pressure equalizing valve. It is an object of the present invention to provide a working head and a combustion apparatus including the same.

  In order to solve the above problems, the present invention takes the following technical means.

  The fuel supply head provided by the first aspect of the present invention includes a head main body having a nozzle for fuel ejection, and the fuel connected to the head main body and supplied to a fuel inflow port. A base member that forms a fuel supply path leading to the inside, and a pressure receiving diaphragm, and receives a signal pressure from the outside, whereby the pressure of the fuel supplied to the head body is changed to the signal pressure And a pressure adjusting valve that controls the pressure corresponding to the fuel supply head, wherein the pressure adjusting valve has a valve body located in the fuel supply path and has a valve body in the fuel supply path. A main pressure adjusting valve for changing the fuel flow rate, and an auxiliary pressure adjusting valve for sending a control pressure to the main pressure adjusting valve by receiving the primary pressure and the secondary pressure of the fuel supply passage in addition to the signal pressure Togumi The main pressure regulating valve has a configuration in which a diaphragm is disposed in a first space portion surrounded by a recess formed in the base member and a cover that closes the opening of the recess. The member is provided with a pressure transmission hole communicating with at least one of the primary side flow path and the secondary side flow path of the fuel supply path, and one end of the hole opens to the outer surface of the base member. The auxiliary pressure regulating valve has a member forming a second space in which a diaphragm is disposed, and the member is attached to an opening portion of the pressure transmission hole. The space portion 2 communicates with the hole.

According to such a configuration, since the main pressure regulating valve is controlled using the auxiliary pressure regulating valve, the total number of valves increases, but the auxiliary pressure regulating valve controls the main pressure regulating valve. Therefore, it is possible to produce a control pressure for the purpose, and the whole can be made considerably small. Further, the main pressure regulating valve can be downsized without reducing the stroke of the valve body and the diaphragm. In addition to the above, the following effects can also be obtained.
That is, with respect to the main pressure regulating valve, the diaphragm is incorporated in the first space surrounded by the recess of the base member and the cover, so that the portion of the diaphragm is not greatly bulky outside the base member. Is possible. On the other hand, the auxiliary pressure regulating valve has a structure in which the member forming the second space portion is attached to the position where the pressure transmission hole is formed. It is possible to eliminate or reduce the arrangement of the pipes in a bulky state outside the base member and the auxiliary pressure regulating valve, thereby further promoting the downsizing of the whole.

  In the present invention, preferably, the auxiliary pressure adjusting valve is provided on a surface of the base member opposite to a surface on which the concave portion and the cover are provided.

  According to such a configuration, it is easy to secure a space for providing the auxiliary pressure regulating valve, and it is more preferable for downsizing. That is, in the base member, the concave portion and the cover are for disposing the diaphragm of the main pressure regulating valve, so that the concave portion and the cover occupy a relatively large space on one side of the base member. On the other hand, if the auxiliary pressure adjusting valve is provided on the surface opposite to the auxiliary pressure adjusting valve, the auxiliary pressure adjusting valve can be provided in a space-efficient manner while avoiding interference with the recess and the cover.

  In the present invention, preferably, a hole for primary pressure that communicates the second space with the primary channel is provided as the hole for pressure transmission, and the hole for primary pressure is An opening at an end that penetrates the base member in the thickness direction and is located on the side opposite to the second opening is covered with the cover, and the cover and the base member are opposed to each other. A concave groove communicating with the primary-side flow path is formed at a location where the concave groove is connected to the primary pressure hole.

  According to such a configuration, it is not necessary to provide a flow path for transmitting the primary pressure of the fuel supply path to the auxiliary pressure regulating valve in a bulky state outside the base member, simplifying the overall structure, This is more preferable for downsizing.

  In the present invention, preferably, the cover is formed with an additional groove for communicating a pressure receiving chamber formed between the cover and the diaphragm of the main pressure regulating valve with the groove. .

  According to such a configuration, the structure for communicating the pressure receiving chamber of the main pressure regulating valve with the primary flow path of the fuel supply path is also simplified.

  In the present invention, preferably, as the pressure transmission hole, a secondary pressure hole for communicating the second space portion with the secondary side flow path is provided, and the secondary pressure hole is: From the first hole that penetrates the base member in the thickness direction and has one end opened to the second space portion, and the portion that communicates with the other end of the first hole in one side of the base member. A second hole penetrating toward the terminal end region of the secondary channel in the base member is combined.

  According to such a configuration, there is no need to provide a flow path for transmitting the secondary pressure of the fuel supply path to the auxiliary pressure regulating valve in a bulky state outside the base member. Moreover, although the hole for secondary pressure mentioned above is the structure which combined the 1st and 2nd hole, since these 1st and 2nd holes are all through-holes, those processes are Easy.

  The combustion apparatus provided by the second aspect of the present invention includes a burner, a fuel supply head for supplying fuel to the burner, and a fan for supplying combustion air to the burner. A combustion apparatus, wherein the fuel supply head according to claim 1 is used as the fuel supply head, and the discharge pressure of the fan is used as the signal pressure. It is a feature.

  According to such a configuration, the same effect as described for the fuel supply head provided by the first aspect of the present invention can be obtained, and the apparatus can be suitably downsized. Further, since the passage configuration for transmitting each pressure is simple, it is possible to provide a fuel supply head that is excellent in followability to the signal pressure, and to improve the combustion stability of the combustion device.

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

It is sectional drawing which shows typically an example of the schematic structure of a combustion apparatus with which this invention was applied, and a pressure transmission path | route. (A) is a left view which shows the fuel supply head used for the combustion apparatus shown in FIG. 1, (b) is a front view. FIG. 3 is a rear view of FIG. FIG. 3 is an exploded view of FIG. It is a principal part front view which shows the state which removed the predetermined | prescribed cover in the structure shown in FIG.2 (b). It is VI-VI sectional drawing of FIG.2 (b). It is a perspective view which shows the cover and diaphragm which comprise the main pressure control valve of the structures shown in FIG. It is VIII-VIII sectional drawing of FIG.2 (b). It is principal part sectional drawing which shows the operation state of the switching valve of the structure shown in FIG. It is principal part sectional drawing which shows the other example of this invention.

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

FIG. 1 shows an example of a combustion apparatus to which the present invention is applied. However, in the figure, the structure is schematically shown in order to facilitate understanding of the pressure transmission path of the fuel supply head H. The fuel supply head H shown in FIG. It does not accurately reflect the size ratio of each component intended by the invention.
For ease of understanding, first, the overall configuration of the combustion apparatus C shown in FIG. 1 and the operating principle of pressure control in the fuel supply head H will be described.

  The combustion device C shown in FIG. 1 is configured as a gas hot water supply device including a heat exchanger 19 for heating hot water, and includes a burner 15, a fan 16, and a fuel supply head H arranged in the can 1. It has. The fuel supply head H includes a head main body 2, a base member 3, an on-off valve Vc, a main pressure adjustment valve Va, an auxiliary pressure adjustment valve Vb, a plurality of on-off valves Vd, and a switching valve Ve. The main pressure adjustment valve Va and the auxiliary pressure adjustment valve Vb exhibit a function of controlling the fuel supply pressure to a predetermined pressure as will be described later, in cooperation with each other.

  The head main body 2 has a plurality of nozzles 20 for ejecting fuel gas and a plurality of flow paths 21 for distributing and supplying fuel gas to the plurality of nozzles 20. The fuel gas ejected from each nozzle 45 is mixed with the combustion air sent from the fan 16 into the can 1 and supplied to the burner 15 for combustion. Heat is recovered from the combustion gas generated by this combustion by the heat exchanger 19, and hot water flowing through the heat exchanger 19 is heated. The combustion gas after heat recovery is discharged from the exhaust port 11 as exhaust gas.

  The base member 3 has a gas inlet 49 that receives fuel gas from the gas pipe 40, and forms a fuel supply path 4 inside. The on-off valve Vc serves as a main valve, and is an electromagnetic valve that reciprocates the valve body 51 using the solenoid 50. On the other hand, the plurality of on-off valves Vd are valves for selecting a fuel gas supply area, and individually turn on / off the fuel gas from the fuel supply path 4 to the plurality of flow paths 21 of the head body 2. To change the fuel gas supply area (and the combustion area of the burner 15). Each on-off valve Vd is also an electromagnetic valve, and its basic structure is the same as that of the on-off valve Vc.

  The main pressure adjustment valve Va is connected to the downstream side of the on-off valve Vc. The main pressure regulating valve Va includes a valve body 60 that opens and closes a pressure regulating hole 42 at the boundary between the primary side flow path 4a and the secondary side flow path 4b in the fuel supply path 4, and a pressure receiving pressure that supports the valve body 60. And a return spring 62. The diaphragm D1 receives the secondary pressure P2 (pressure of the secondary side flow path 4b) and a control pressure Pd described later supplied to the pressure receiving chamber 63.

  The auxiliary pressure regulating valve Vb does not directly control the pressure in the fuel supply path 4, but controls the pressure regulating valve Va. As will be described later, the auxiliary pressure regulating valve Vb can be formed in a considerably smaller size than the pressure regulating valve Va. The auxiliary pressure regulating valve Vb includes a pressure receiving chamber 75a, a secondary pressure chamber 75b, first and second springs S1 and S2, a pressure regulating hole 71, and a valve body 73 partitioned by a diaphragm D2. The discharge pressure Ps1 or Ps2 of the fan 16 is selectively supplied as a signal pressure to the pressure receiving chamber 75a. More specifically, as shown in FIG. 1, discharge pressure detectors 17 and 18 for detecting the discharge pressures Ps1 and Ps2 of the fan 16 are provided in or near the discharge port of the fan 16. The discharge pressures Ps1 and Ps2 are sent to the switching valve Ve via the flow paths 89a and 89b, and one discharge pressure selected by the switching valve Ve is input to the pressure receiving chamber 75a. Yes. In addition, since the discharge pressure detection part 17 is located in the downstream rather than the discharge pressure detection part 18, it becomes the relationship of Ps1 <Ps2.

  The pressure adjusting hole 71 of the auxiliary pressure regulating valve Vb is configured to be supplied with the primary pressure P1 of the fuel supply path 4 via the first flow path 74a having the orifice 40. The valve body 73 is a portion of the diaphragm D2 that faces the pressure adjusting hole 71. When the diaphragm D2 moves to the left side in FIG. 1 and approaches the pressure adjusting hole 71, the amount of fuel gas that passes through the pressure adjusting hole 71 is It has come to decrease. A second flow path 74b is connected to the first flow path 74a, and the second flow path 74b is supplied to the pressure receiving chamber 63 of the main pressure adjustment valve Va. Further, the secondary pressure chamber 75b of the auxiliary pressure regulating valve Vb and the secondary side flow path 4b of the main pressure regulating valve Va are connected via a third flow path 74c.

According to the configuration described above, the secondary pressure P2 can be set to a pressure corresponding to the discharge pressure Ps1 or Ps2 of the fan 16 (for example, a pressure equivalent to the discharge pressure Ps1 or Ps2) as described below.
That is, the pressure Pd in the second flow path 74b is input to the pressure receiving chamber 63 of the main pressure adjustment valve Va as a control pressure. Here, the pressure Pd corresponds to the valve opening degree of the auxiliary pressure regulating valve Vb. More specifically, when the distance between the valve body 73 of the auxiliary pressure regulating valve Vb and the pressure adjusting hole 71 is large, the fuel gas in the first flow path 74a flows more into the second flow path 74b, so the pressure Pd is low. Become. On the other hand, the pressure Pd increases as the distance decreases. Further, since the secondary side flow path 4b and the secondary pressure chamber 75b communicate with each other via the third flow path 74c, the pressure of the secondary pressure chamber 75b is the secondary pressure of the secondary side flow path 4b. It is equal to P2. On the other hand, the discharge pressure Ps1 or Ps2 of the fan 16 is input as a signal pressure to the pressure receiving chamber 75a of the auxiliary pressure regulating valve Vb, and the diaphragm D2 is pushed by the discharge pressure Ps1 or Ps2 to close the pressure adjusting hole 71. Move to. In this case, the sum of the pressing force of the discharge pressure on the diaphragm D2 and the pressing force of the first spring S1 is balanced with the sum of the pressing force of the secondary pressure P2 on the diaphragm D2 and the pressing force of the second spring S2. Diaphragm D2 moves to the position. As described above, the pressure Pd in the second flow path 74b depends on the position of the diaphragm D2. In the main pressure adjustment valve Va, the diaphragm D1 moves in the direction of increasing the valve opening degree by the pressure Pd. In this case, the discharge pressure Ps1 or Ps2 in which the secondary pressure P2 is supplied to the auxiliary pressure adjustment valve Vb. It will move to a position that balances. With such an operation principle, the secondary pressure P2 can be controlled to a pressure (for example, the same pressure) corresponding to the discharge pressure Ps. If either one of the two types of discharge pressures Ps1 and Ps2 can be selected as appropriate, for example, the fuel gas type is “13A” or “12A” with different calorific values. However, it is possible to set the air-fuel ratio suitable for the fuel gas.

  Next, a specific configuration of the fuel supply head H will be described with reference to FIGS. In the following, for convenience of explanation, the surface (the surface on the side where the nozzle 20 is not provided in this embodiment) that can be seen on the front side in FIG. The surface opposite to this is the rear surface.

  2 and 3, the head main body 2 is configured as a manifold, and a plurality of nozzles 20 are provided side by side in the width direction in the vicinity of the upper edge thereof. The plurality of flow paths 21 for distributing the fuel gas to the plurality of nozzles 20 extend in the vertical direction and are arranged in the horizontal width direction. The head main body 2 is configured by stacking two metal plates 22 and 23 made of metal, and the plurality of flow paths 21 correspond to the flow paths 21 by pressing one metal plate 22. It is formed by bulging the part. The head main body 2 is, for example, screwed to the upper part of the base member 3.

The base member 3 is, for example, die-cast, and is appropriately subjected to polishing processing or the like at a place where planar accuracy is required. A cylindrical portion 30 is formed at one end of the base member 3 in the width direction, and the lower end opening is a fuel gas inlet 49. An open / close valve Vc is provided in the vicinity of the upper portion of the cylindrical portion 30. In the base member 3, a series of fuel supply passages 4 connected to the inflow ports 49 are formed. The terminal portion 48 of the fuel supply passage 4 has an upper edge as shown in FIG. 4. It is located in the vicinity of the portion and extends in the lateral width direction. The terminal portion 48 is a portion that communicates with the lower end portion of each flow path 21 of the head main body 2, and a plurality of valve bodies of the on-off valves Vd are disposed therein.

  The primary flow path 4 a of the fuel supply path 4 is formed on the front side of the base member 3. Specifically, as shown in FIGS. 5 and 6, a concave portion 32 whose one side surface is closed by the cover 31 communicates with an inflow port 49 on the front side of the base member 3. It corresponds to a part of the primary flow path 4a. A pressure regulating hole 42 is provided in the wall 33 existing in the inner part of the recess 32 (in FIG. 5, the valve body 60 for opening and closing the pressure regulating hole 42 is omitted).

  In FIG. 6, a concave portion 35 whose one side surface is closed by a cover 34 is formed on the rear surface portion of the base member 3, and a first space portion R <b> 1 is provided. The main pressure regulating valve Va has a configuration in which a diaphragm D1 is disposed in the first space R1. In the first space R1, a region closer to the wall 33 than the diaphragm D1 corresponds to a part of the secondary side flow path 4b. Further, an upwardly extending hole 43 is formed in the upper wall portion of the region, and the region and the end portion 48 of the secondary side flow path 4b are connected via the hole 43. The diaphragm D1 is in a posture that faces in a substantially horizontal direction, and the diaphragm D1 and the valve body 60 operate in a substantially horizontal direction. As a means for stabilizing this operation, a configuration in which a guide 60b for supporting and sliding the shaft portion 60a projecting from the valve body 60 can be provided.

  As shown in FIG. 2, the auxiliary pressure regulating valve Vb is provided on one side of the front surface of the base member 3 and on the one side (left side in the figure) where the recess 32 is formed and the cover 31 is mounted. It has been. As shown in FIG. 8, the auxiliary pressure regulating valve Vb is configured by assembling synthetic resin first and second members 77 a and 77 b to the front surface portion of the base member 3. The first and second members 77a and 77b form a second space R2 in which the diaphragm D2 is disposed, and the area close to the base member 3 is 2 in the second space R2. It is the next pressure chamber 75b and the pressure regulation hole forming member 72 is arranged. A region opposite to the secondary pressure chamber 75b across the diaphragm D2 is a pressure receiving chamber 75a.

  The base member 3 is provided with pressure transmission holes 36 and 37a penetrating in the thickness direction. Of these, the hole 36 constitutes a part of the first flow path 74 a, and the pressure adjusting hole 71 communicates with one end opening of the hole 36. The other end opening of the hole 36 is covered by the cover 34 and the edge of the diaphragm D1, and the cover 34 is formed with a concave groove 38 communicating with the hole 36. The concave groove 38 is formed in a manner as shown in FIG. 7, and a through hole 39a is formed in the diaphragm D1. A portion 38a of the concave groove 38 communicates with the pressure transmission hole 36 through the through hole 39a. Further, the diaphragm D1 is formed with a through hole 39b for making the one end portion 38b of the concave groove 38. The one end 38b and the through hole 39b communicate with the hole 44 covered by the cover 34 as shown in FIG. The hole 44 is provided in communication with the primary side flow path 4 a, and the orifice 40 is disposed in the hole 44. Therefore, the orifice 40, the concave groove 38, and the pressure transmission hole 36 are connected in series and supply the primary pressure P1 to the pressure adjusting hole 71, thereby constituting the first flow path 74a.

  As shown in FIGS. 3 and 7, an additional concave groove 38 </ b> A having one end connected to the concave groove 38 is also formed on the inner side surface of the cover 34. The other end of the additional concave groove 38 </ b> A is connected to a concave portion 34 a formed on the inner surface of the cover 34. Accordingly, the additional concave groove 38A serves to supply a part of the fuel gas passing through the concave groove 38 from the primary side flow path 4a to the pressure receiving chamber 63 of the main pressure regulating valve Va to apply the pressure Pd. And the second flow path 74b is formed.

  As shown in FIG. 8, a hole 77a 'provided in the first member 77a of the auxiliary pressure regulating valve Vb communicates with one end opening of the pressure transmitting hole 37a. The other end of the hole 37a opens to the rear surface portion of the base member 3, and the hole 37b is provided through the opening portion toward the terminal portion 48 of the secondary flow path 4b. These holes 37a and 37b correspond to specific examples of the first and second holes in the present invention and communicate with each other. Further, the portion where they are connected to each other is configured to be covered with the diaphragm D1 and the cover 34 so that fuel gas does not leak. The holes 37a and 37b connect the secondary side flow path 4b and the secondary pressure chamber 75b of the auxiliary pressure regulating valve Vb, and constitute a third flow path 74c.

  The first and second members 77a and 77b constituting the auxiliary pressure regulating valve Vb are further provided with the third and fourth members 77c and 77d, and the switching valve Ve is constituted by these members. . More specifically, the second to fourth members 77b to 77d form a third space R3 in which the valve body 80 is disposed. The third space R3 communicates with the pressure receiving chamber 75a via a passage 88 formed between the second and third members 77b and 77c. Furthermore, the third space R3 communicates with the holes 89a 'and 89b' constituting the flow paths 89a and 89b. The base member 3 is provided with connecting portions 87a and 87b for piping (see, for example, FIG. 3), and the discharge pressures Ps1 and Ps2 of the fan 16 supplied to these connecting portions 89a and 89b are as follows. The third space R3 is reached through the flow paths 89a and 89b (holes 89a ′ and 89b ′).

  The valve body 80 of the switching valve Ve can operate in the manner shown in FIGS. In the embodiment shown in FIG. 8, the valve body 80 is retracted by the elastic force of the spring 81, the flow path 89a communicates with the pressure receiving chamber 75a, and the flow path 89b and the pressure receiving chamber 75a are blocked. ing. In this case, the discharge pressure Ps1 is supplied to the pressure receiving chamber 75a. On the other hand, in the embodiment shown in FIG. 9, the valve element 80 is pushed forward by the solenoid 82, the flow path 89a and the pressure receiving chamber 75a are blocked, and the flow path 89b and the pressure receiving chamber 75 are blocked. There is communication between In this case, the discharge pressure Ps2 of the fan 16 is supplied to the pressure receiving chamber 75a. Accordingly, both the discharge pressures Ps1 and Ps2 of the fan 16 can be selectively supplied to the pressure receiving chamber 75a.

  The fuel supply head H having the above-described configuration satisfies all the configurations necessary for the pressure control described with reference to FIG. 1, and the pressure of the fuel gas supplied toward the burner 15 is set to the discharge pressure of the fan 16. The pressure corresponding to Ps1 and Ps2 can be set. In this fuel supply head H, since the pressure control is performed by the cooperative action of the main pressure adjusting valve Va and the auxiliary pressure adjusting valve Vb, the size of the main pressure adjusting valve Va can be reduced. Further, since the main pressure regulating valve Va has a configuration in which the diaphragm D1 is accommodated in the first space R1 formed by using the recess 35 provided in the base member 3, the arrangement position of the diaphragm D1 is the base member. It is possible to appropriately prevent the protrusion 3 from protruding outward. In addition, the auxiliary pressure regulating valve Vb can be formed to be considerably smaller than the main pressure regulating valve Va. However, since the auxiliary pressure regulating valve Vb is appropriately arranged to avoid interference with the main pressure regulating valve Va, the overall size can be reduced. Is more preferable. Most of the flow paths for transmitting the fuel gas pressure between the auxiliary pressure regulating valve Vb and the main pressure regulating valve Va are holes 36, 37a, 37b, 89a ′, 89b provided in the base member 3. Since it is configured using the concave grooves 38, 38A provided in the cover 34, the piping member can be prevented from being bulky in an unnatural state outside the base member 3. Moreover, if the connection work of such a piping member can be omitted, the assembly workability will be good and an increase in manufacturing cost can be suppressed.

FIG. 10 shows another example in which the secondary pressure chamber 75b of the auxiliary pressure regulating valve Vb and the secondary flow path 4b are communicated with each other by using two pressure transmission holes 37a and 37b. In the configuration shown in the figure, a recess 37c is formed in the rear surface portion of the base member 3, and holes 37a, 37b are formed in the recess 37c.
Each of them is open. According to such means, it is possible to eliminate the need to accurately position the ends of the holes 37a and 37b. Further, when fine dust is mixed in the holes 37a and 37b, it is also possible to collect the dust at the position of the concave portion 37c, thereby suppressing the occurrence of clogging in the holes 37a and 37b. Can gas.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the fuel supply head and the combustion apparatus according to the present invention can be varied in design in various ways.

  The combustion apparatus according to the present invention may be configured as a combustion apparatus such as a fan heater, a stove, or an incineration combustion apparatus, for example, instead of a hot water apparatus such as a hot water supply apparatus provided with a heat exchanger.

C Fuel device D1 Diaphragm (main pressure regulating valve)
D2 Diaphragm (for auxiliary pressure regulating valve)
H Fuel supply head Va Main pressure regulating valve (pressure regulating valve)
Vb Auxiliary pressure regulating valve (pressure regulating valve)
P1 Primary pressure P2 Secondary pressure Ps1, Ps2 Signal pressure Pd Control pressure R1 First space R2 Second space 2 Head body 3 Base member 4 Fuel supply path 4a Primary side flow path 4b Secondary side flow Passage 15 Burner 16 Fan 20 Nozzle 34 Cover 35 Recess 36 Hole for pressure transmission (hole for primary pressure)
37a, 37b First and second holes (secondary pressure holes)
38 concave groove 38A additional concave groove 48 end portion (of fuel supply path)
60 Valve body (for main pressure regulating valve)
73 Valve body (for auxiliary pressure regulating valve)
77a, 77b first and second members

The first and second members 77a and 77b constituting the auxiliary pressure regulating valve Vb are further provided with the third and fourth members 77c and 77d, and the switching valve Ve is constituted by these members. . More specifically, the second to fourth members 77b to 77d form a third space R3 in which the valve body 80 is disposed. The third space R3 communicates with the pressure receiving chamber 75a via a passage 88 formed between the second and third members 77b and 77c. Furthermore, the third space R3 communicates with the holes 89a ′ and 89b ′ constituting the flow paths 89a and 89b. The base member 3 is provided with connecting portions 87a and 87b for piping (see, for example, FIG. 3), and the discharge pressures Ps1 and Ps2 of the fan 16 supplied to these connecting portions 87a and 87b are as follows. The third space R3 is reached through the flow paths 89a and 89b (holes 89a ′ and 89b ′).

Claims (6)

A head body having a nozzle for fuel ejection;
A base member which is connected to the head main body part and forms a fuel supply path for guiding the fuel supplied to the fuel inlet to the head main body part;
A pressure regulating valve that has a pressure receiving diaphragm and receives the signal pressure from the outside to control the pressure of the fuel supplied to the head main body to a pressure corresponding to the signal pressure;
A fuel supply head comprising:
The pressure regulating valve includes a main pressure regulating valve that has a valve body located in the fuel supply path and changes a fuel flow rate in the fuel supply path, and a primary pressure of the fuel supply path in addition to the signal pressure. An auxiliary pressure regulating valve that sends a control pressure to the main pressure regulating valve by receiving pressure and secondary pressure,
The main pressure regulating valve has a configuration in which a diaphragm is disposed in a first space portion surrounded by a recess formed in the base member and a cover for closing the opening of the recess,
The base member is provided with a pressure transmission hole communicating with at least one of the primary side flow path and the secondary side flow path of the fuel supply path, and one end of the hole opens on the outer surface of the base member. And
The auxiliary pressure regulating valve has a member that forms a second space in which a diaphragm is disposed, and the second pressure adjusting valve is attached to an opening portion of the pressure transmission hole. The fuel supply head, wherein the space portion communicates with the hole.   2. The fuel supply head according to claim 1, wherein the auxiliary pressure regulating valve is provided on a surface of the base member opposite to a surface on which the concave portion and the cover are provided. As the hole for pressure transmission, a hole for primary pressure that communicates the second space portion with the primary channel is provided,
The hole for primary pressure penetrates the base member in the thickness direction, and an opening at an end located on the opposite side to the second opening is covered with the cover,
A concave groove communicating with the primary flow path is formed at a location where the cover and the base member face each other, and the concave groove and the primary pressure hole are connected to each other. The fuel supply head described in 1.   The said cover is provided with the additional ditch | groove for making the pressure receiving chamber formed between the said cover and the diaphragm of the said main pressure regulating valve communicate with the said ditch | groove. Fuel supply head. As the hole for pressure transmission, a hole for secondary pressure that communicates the second space portion with the secondary side flow path is provided,
The secondary pressure hole includes a first hole that penetrates the base member in the thickness direction and has one end opened to the second space portion, and one of the surfaces of the base member. 5. The structure according to claim 1, wherein the second hole penetrating from the portion communicating with the other end toward the terminal end region of the secondary-side flow path in the base member is combined. Fuel supply head. With a burner,
A fuel supply head for supplying fuel to the burner;
A fan for supplying combustion air to the burner;
A combustion device comprising:
6. A combustion apparatus, wherein the fuel supply head according to claim 1 is used as the fuel supply head, and the discharge pressure of the fan is used as the signal pressure. .

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