JP4092584B2 - Combustion device - Google Patents

Description

  The present invention relates to a combustion apparatus that can be suitably used for a hot water heater or the like, and more particularly to a combustion apparatus that includes an intermittent on-off valve that can be periodically opened and closed.

  2. Description of the Related Art Conventionally, a hot water heating apparatus represented by a hot water supply apparatus or the like has frequently used a combustion apparatus that sprays and burns liquid fuel such as petroleum. As an example of a conventional combustion apparatus, there is one as shown in Patent Document 1 below. FIG. 13 is a cross-sectional view of a hot water supply device incorporating a combustion device for spraying and burning fuel. In FIG. 13, 130 is a hot water supply device, and 131 is a combustion device. A combustion apparatus 131 shown in FIG. 13 has a combustion case 132, and a heat exchanger 133 is provided below the combustion case 132. The heat exchanger 133 is obtained by inserting a water pipe into the combustion case 132.

  The combustion device 131 includes a fuel injection nozzle 135, a nozzle storage cylinder 136, a combustion cylinder 137, and a blower 138. The fuel injection nozzle 135 is housed in the nozzle housing tube 136 and sprays fuel supplied from the outside into the combustion tube 137.

  FIG. 14 is a conceptual diagram showing a fuel system in the combustion device 131. The fuel injection nozzle 135 has a spray opening for spraying fuel, and is provided with a forward flow path leading to the spray opening and a return flow path returning from the spray opening. A first pump 140 and a second pump 141 are connected in series on the inlet side of the fuel injection nozzle 135, and are connected to the fuel tank 143 through an electromagnetic valve 142. Here, the first pump 140 is an electromagnetic pump whose discharge amount can be arbitrarily changed, and the second pump 141 is a constant differential pressure pump. On the other hand, a check valve 145 and a proportional valve 146 are connected in series on the return side of the fuel injection nozzle 135 and are connected upstream of the first pump 140 in the forward flow path.

  FIG. 15 is a schematic diagram of a proportional valve 146 employed in a conventional combustion device 131. The proportional valve 146 has a fuel flow channel 151 formed in the casing 150. An accumulator 154 is attached to and integrated with the casing 150 in order to buffer the pressure of the fuel flowing in the return side flow path. A fuel inlet 152 to which a check valve 145 is connected and a fuel outlet 153 through which fuel flows out are formed at the end of the fuel passage 151, and a valve seat 155 is provided in the middle of the fuel passage 151. Is provided. A spherical valve body 156 is disposed on the valve seat 155 so as to be able to contact and separate. A plunger 157 is disposed at a position where the valve body 156 abuts. A coil 158 is provided around the plunger 157. When the coil 158 is energized, the plunger 157 moves back and forth on the axis of the casing 150 and pushes and moves the valve body 156.

  When the valve body 156 is pushed by the plunger 157, the flow path area of the fuel flow path 151 changes, and the flow rate of the fuel flowing out from the fuel inlet 152 to the fuel outlet 153 changes. Therefore, the proportional valve 146 can adjust the flow rate of the fuel flowing through the return side flow path by changing the power flowing through the coil 158 by a power adjusting unit (not shown).

  In the conventional combustion apparatus 131, the fuel supplied from the fuel tank 143 is pressurized by the first pump 140 and supplied to the suction side of the second pump 141. The fuel is further pressurized by the second pump 141 and flows into the fuel injection nozzle 135.

  The pressurized and high pressure fuel reaches the spray opening at the tip of the fuel injection nozzle 135, a part of which is opened to the outside and sprayed in the form of a mist. The remaining fuel that has been supplied to the fuel injection nozzle 135 but not sprayed passes through the check valve 145 and flows into the fuel inlet 152 of the proportional valve 146. The fuel that has flowed into the proportional valve 146 from the fuel inlet 152 is returned to the upstream side of the forward flow path at a flow rate corresponding to the amount of current flowing through the coil 158.

JP-A-8-270912

  In the conventional combustion apparatus 131, the fuel spray amount sprayed from the fuel spray nozzle 135 is adjusted by adjusting the fuel flow rate returned from the proportional valve 146 to the forward flow path. That is, the conventional combustion apparatus 131 adjusts the opening of the valve body 156 and adjusts the fuel spray amount by applying predetermined power to the coil 158 of the proportional valve 146 according to the required combustion amount. Was.

  When the combustion device 131 is driven to burn, the temperature of the proportional valve 146 gradually changes due to a change in ambient temperature, and the temperature of the coil 158 in the casing 150 also changes. The resistance value of the coil 158 increases or decreases due to a temperature change. Therefore, when the temperature of the coil 158 is unstable, the amount of current flowing through the coil 158 becomes unstable, and it is difficult to adjust the flow rate of the fuel flowing through the return flow path. Therefore, it is difficult for the conventional combustion apparatus 131 to accurately adjust the fuel spray amount and stabilize the combustion state, and it is necessary to separately provide a constant current circuit in order to stabilize the supply current amount.

  The proportional valve 146 finely adjusts the gap between the valve body 156 and the fuel flow path 151 by moving the plunger 157 forward and backward to adjust the fuel flow rate. Therefore, the flow rate of the fuel in the proportional valve 146 changes greatly due to mechanical variations such as the shapes of the fuel flow path 151 and the valve body 156. Therefore, in the conventional combustion apparatus 131, in order to stably burn the fuel, it is necessary to separately provide an adjusting means for adjusting the above-described mechanical variation in the power adjusting means connected to the coil 158.

  Therefore, in order to solve the above-described problems, the present inventors conducted an experiment by adopting an injector valve 10 (intermittent on-off valve) as shown in FIG. 3 as a fuel flow control valve. Here, the injector valve 10 can open and close the valve body 33 intermittently in a very short time. More specifically, the injector valve 10 includes an actuator 31, an electromagnetic coil 32, and a valve body 33 inside the casing 30. In the injector valve 10, when a current flows through the electromagnetic coil 32, the actuator 31 is driven and the valve body 33 is opened.

  If the above-described injector valve 10 is used as a flow control valve, the combustion amount can be adjusted with higher accuracy than when a proportional valve or the like is employed as the flow control valve. However, when the injector valve 10 is employed, when the combustion device 131 is driven to burn, noise accompanying opening and closing of the valve body 33 is generated. When the combustion amount of the combustion device 131 is large, this noise is canceled out by the combustion noise. However, when the combustion amount of the combustion device 131 is small, the noise accompanying the opening and closing of the injector valve 10 is conspicuous. The noise generated when the injector valve 10 is opened and closed is a metallic and annoying noise generated by the collision between the valve element 33 and the casing 30, which gives the user an unpleasant feeling.

  In view of the above-described problems, an object of the present invention is to provide a combustion apparatus that can accurately adjust the amount of fuel spray and that generates less noise during combustion driving.

The invention according to claim 1 is a combustion apparatus having a spray means for spraying fuel and a fuel circuit through which the fuel flows, wherein the fuel circuit is sprayed in a fuel forward path connected to the spray means and in the spray means. A fuel return path that returns the remaining fuel to the fuel forward path, and an intermittent on-off valve that can be periodically opened and closed is provided in the middle of the fuel return path. Is connected to the fuel injection side of the intermittent on-off valve, and the injection side joint is connected to the fuel injection side of the intermittent on-off valve. Surrounded by members, the introduction side joint is provided with a pipe connection part provided with a communication hole through which fuel passes, and the ejection side joint is connected with a connection part for discharging fuel The intermittent on-off valve supplies fuel. Fed from the pipe connection portion of the serial introduction side joint side to the intermittent on-off valve, and is connected to discharge fuel supplied through the intermittent on-off valve from the ejection side joint side of the connecting portion, and the sound insulating member The combustion apparatus is characterized in that an elastic member is interposed between the intermittent on-off valve and fills a gap between the sound insulation member and the intermittent on-off valve .

  Since the combustion device of the present invention is provided with an intermittent on-off valve in the middle of the fuel return path, the combustion amount is more accurate than when a proportional valve or the like is provided as a flow control valve as in the conventional combustion device. Can be adjusted. However, when an intermittent on-off valve is employed, metallic and annoying noise is generated with the opening and closing of the valve.

  However, in the combustion apparatus of the present invention, part or all of the intermittent on-off valve is surrounded by the sound insulation member. Therefore, even when the intermittent on-off valve is frequently opened and closed with combustion driving, that is, even when the combustion noise is small, such as when the amount of fuel returned from the spray means is small, the intermittent on-off valve Noise leakage associated with the opening and closing of the engine can be greatly reduced to the extent that it is eliminated by the combustion noise.

The invention according to claim 1 is a combustion apparatus characterized in that an elastic member is interposed between the sound insulation member and the intermittent on-off valve to fill a gap between the sound insulation member and the intermittent on-off valve.

  According to such a configuration, most of noise and vibration generated by opening and closing of the intermittent on-off valve accompanying combustion driving can be absorbed by the elastic member. Therefore, according to the above-described configuration, it is possible to reduce the noise generated when the intermittent on-off valve is driven to such an extent that the noise generated by the combustion drive is extinguished.

  Moreover, according to the above-described configuration, fuel leakage between the sound insulation member and the intermittent on-off valve can be prevented.

The combustion apparatus according to claim 1 may be characterized in that the introduction side joint and the ejection side joint are provided with recesses, and the end of the intermittent on-off valve is inserted into the recess ( Claim 2 ).

In the combustion apparatus according to claim 2 , it is desirable that the gap between the intermittent on-off valve and the recess is sealed with an elastic member ( claim 3 ).

In the combustion apparatus according to any one of claims 1 to 3 , the intermittent on-off valve has a built-in valve body and an actuator that periodically reciprocates to open and close the valve body. An elastic member may be interposed in a gap formed in the direction of reciprocation of the actuator by the ejection side joint and the intermittent on-off valve ( claim 4 ).

According to a fifth aspect of the present invention, the fuel circuit includes a spraying means for spraying fuel, a fuel circuit through which the fuel flows, and a fuel pump for sending fuel to the spraying means. The combustion apparatus according to any one of claims 1 to 4 , wherein the joint is directly connected to the fuel pump and the spraying means.

  In the combustion apparatus of the present invention, the introduction side joint or the ejection side joint is directly connected to the fuel pump and the spraying means. That is, in the combustion apparatus of the present invention, the pipe connecting the intermittent on-off valve, the fuel pump, and the spraying means is integrated with the introduction side joint or the ejection side joint. Therefore, according to the configuration described above, the fuel circuit connected to the spraying means can be simplified.

  In the combustion apparatus of the present invention, since the piping connecting the intermittent on-off valve, the fuel pump, and the spraying means is integrated with the introduction side joint or the ejection side joint, the assembly of the combustion apparatus is easy. Moreover, according to the above-described configuration, the number of components can be reduced as compared with the conventional combustion apparatus, and the manufacturing cost can be reduced.

The combustion apparatus according to any one of claims 1 to 5 , wherein the fuel forward path has a configuration in which a fuel tank, an electromagnetic valve, and a fuel pump that sends fuel to the spraying means are connected in series. One end of the return path may be connected to the spraying means, and the other end may be connected between the solenoid valve and the pump in the fuel forward path ( Claim 6 ).

The combustion apparatus according to any one of claims 1 to 6 is characterized in that the ejection side joint has a connecting portion for connecting a fuel pump for sending fuel to the spraying means. ( Claim 7 ).

  ADVANTAGE OF THE INVENTION According to this invention, the leakage of the noise which generate | occur | produces when an intermittent on-off valve opens and closes at the time of a combustion drive can be suppressed to the minimum.

  Hereinafter, a hot water supply apparatus (hot water heating apparatus) provided with a combustion apparatus according to an embodiment of the present invention will be described. Drawing 1 is a front view which fractured a part of important section of a hot-water supply device of this embodiment. FIG. 2 is a schematic diagram showing a fuel system in the combustion apparatus of the present embodiment. FIG. 3 is a cross-sectional view of an injector valve provided in the combustion apparatus of the present embodiment. FIG. 4 is a perspective view showing a connection state of the injector valve shown in FIG. 3 with the introduction side joint and the ejection side joint. FIG. 5 is a perspective view showing a state where the introduction side joint shown in FIG. 4 is viewed from the bottom surface side. FIG. 6 is a cutaway view of the ejection side joint shown in FIG. 4. FIG. 7 is a cross-sectional view showing a state where the introduction side joint and the ejection side joint are connected to the injector valve shown in FIG. 3. 8A is a perspective view showing a modified embodiment of the introduction side joint shown in FIG. 4, and FIG. 8B is a perspective view showing a modified embodiment of the ejection side joint. FIG. 9 is a perspective view showing a modified embodiment of the elastic member attached to the injector valve shown in FIG. FIG. 10 is a perspective view showing another embodiment of the present invention, and FIG. 11 is a cross-sectional view taken along line AA of FIG. FIG. 12 is a front view showing still another embodiment of the present invention. In addition, in FIG. 12, about the introduction side joint and the ejection side joint, the cross-sectional shape is illustrated for convenience of explanation.

  In FIG. 1, 1 is a hot water supply apparatus (hot water heating apparatus) of this embodiment, and 2 is a combustion apparatus used for the hot water supply apparatus 1 of this embodiment. Reference numeral 3 denotes a fuel injection nozzle employed in the combustion apparatus 2 of the present embodiment. The hot water supply apparatus 1 of the present embodiment has a combustion case 4 and a heat exchanger 5 provided below the combustion case 4. In the heat exchanger 5, a water pipe is inserted into the combustion case 4. Like the conventional combustion apparatus 101, the combustion apparatus 2 of the present embodiment includes a nozzle storage cylinder 7 whose end is opened inside the air case 6, and a combustion cylinder 8 connected to the end of the nozzle storage cylinder 7. It has. A blower 9 that sends air into the combustion cylinder 8 is connected to the air case 6.

  The combustion apparatus 2 of the present embodiment is greatly different in that an injector valve 10 (intermittent opening / closing valve) is employed instead of the proportional valve 116 provided in the fuel system of the conventional combustion apparatus 131. The combustion apparatus 2 of this embodiment is connected to a fuel system as shown in FIG. The fuel injection nozzle 3 housed in the nozzle housing cylinder 7 of the combustion device 2 has a spray opening for spraying fuel. The fuel injection nozzle 3 has an outward flow path that reaches the spray opening and a return flow path that returns from the spray opening.

  The fuel system connected to the fuel injection nozzle 3 is substantially the same as the fuel system employed in the conventional combustion apparatus 101. That is, the fuel forward path 11 is connected to the entrance side of the fuel injection nozzle 3 as shown in FIG. The fuel forward path 11 is a fuel tank 12, a solenoid valve 13, and a pump 15 connected in series. On the other hand, the return side of the fuel injection nozzle 3 is connected with a fuel return path 17 for returning the fuel remaining without being sprayed to the fuel forward path 11. The fuel return path 17 is formed by connecting a check valve 18, an accumulator 20, and an injector valve 10 in series. The accumulator 20 buffers the pressure of the fuel flowing through the fuel return path 17. The fuel return path 17 is connected between the solenoid valve 13 and the pump 15 in the fuel forward path 11.

  The combustion device 2 of this embodiment includes an injector valve 10 as shown in FIG. 3 and has a function of opening and closing intermittently in a very short time. The injector valve 10 includes an actuator 31 in the casing 30, an electromagnetic coil 32 for driving the actuator 31, and a valve body 33 that is linked to the actuator 31. At both ends of the casing 30, a fuel inlet 35 for supplying fuel into the casing 30 and a fuel outlet 36 for flowing out the fuel are provided. In addition, a fuel flow path 37 through which the fuel flowing in from the fuel inflow port 35 circulates is provided inside the casing 30.

  The casing 30 is made of resin and covers most of the injector valve 10 from the end on the fuel inlet 35 side to the fuel outlet 36 side. That is, the injector valve 10 is covered with the casing 30 except for the end portion on the fuel outlet 36 side. A part of a metal valve body housing part 39 housing the valve body 33 is exposed at the end of the injector valve 10 on the fuel outlet 36 side.

  A connection terminal 38 is provided in an intermediate portion of the casing 30 in the axial direction. The connection terminal 38 is connected to the electromagnetic coil 32, and when a current is supplied to the connection terminal 38, the electromagnetic coil 32 is excited. As a result, the actuator 31 in the casing 30 is driven, and the valve element 33 is opened in conjunction with the actuator 31. That is, in the fuel injection nozzle 3 employed in the present embodiment, the valve body 33 is opened while the current is supplied to the connection terminal 38, and the valve body 33 is closed when the current is stopped. The valve body 33 reacts very sensitively and opens and closes instantaneously.

  At the end of the casing 30 on the fuel inlet 35 side and the end of the valve body storage 39 on the fuel outlet 36 side, annular recesses 40 and 41 are provided, respectively. O-rings 43 and 45 (elastic members) are engaged with the recesses 40 and 41, respectively. The O-rings 43 and 45 fill gaps between the injector valve 10 and the inlet side joint 46 and the ejection side joint 47 described later, and vibration of the injector valve 10 propagates to the introduction side joint 46, the ejection side joint 47, and the like. It also functions as an anti-seismic member to prevent the

  In particular, the O-ring 45 is mounted by a gap formed in the reciprocating direction of the actuator 31 by the injector valve 10 and the ejection side joint 47, that is, a position where a force in the reciprocating direction of the injector valve 10 acts. ing. Therefore, the O-ring 45 can reliably absorb the vibration generated in the reciprocating direction of the injector valve 10.

  As shown in FIGS. 4 and 5, an inlet side joint 46 and a jet side joint 47 are connected to the injector valve 10. More specifically, the introduction side joint 40 is connected to the fuel inlet 35 side of the injector valve 10, and the ejection side joint 41 is connected to the fuel outlet 36 side.

  As shown in FIGS. 4 and 6, the introduction side joint 46 is a substantially box-shaped member made entirely of metal. The introduction side joint 46 is roughly configured by an inlet connection portion 51 that fits with the fuel inlet 35 of the injector valve 10 and a storage portion 52 that stores the connection terminal 38 of the injector valve 10.

  The inflow port connecting portion 51 has a concave portion 53 having substantially the same diameter as the fuel inflow port 35 side of the injector valve 10 on the bottom surface 50 side of the introduction side joint 46. Further, a pipe connection part 56 is provided on the top surface 55 side of the introduction side joint 46. A communication hole 57 is provided in the pipe connection portion 56, and the communication hole 57 communicates with the concave portion 53 described above. The inlet connection portion 51 is configured by a recess 53 and a pipe connection portion 56, and functions as a portion that supplies fuel to the fuel inlet 35 of the injector valve 10 through the communication hole 57.

  The storage part 52 is provided at a position adjacent to the inlet connection part 51 of the introduction side joint 46, and is a concave part opened on the bottom face 50 side. On the side surface of the storage portion 52, a wiring lead-out hole 58 is provided for leading the wiring connected to the connection terminal 38 to the outside.

  As shown in FIGS. 4 and 6, the ejection side joint 47 is entirely made of metal, and is a member in which a portion of the injector valve 10 on the fuel outlet 36 side is accommodated. The ejection side joint 47 has a shape in which the top surface 60 substantially matches the bottom surface 50 of the introduction side joint 46 described above, and the top surface 60 side is open. The ejection side joint 47 is roughly constituted by a main body fitting portion 61 into which the casing 30 and the valve body housing portion 39 of the injector valve 10 are fitted, and a bulging portion 62 in which the connection terminal 38 is housed.

  The body fitting portion 61 is a concave portion extending from the top surface 60 side to the bottom surface 63 side of the ejection side joint 47 and is provided at a position corresponding to the inlet connection portion 51 of the introduction side joint 47 described above. The top surface 60 side of the main body fitting portion 61 has a substantially square shape in plan view, but the bottom surface 63 side has a shape that substantially matches the casing 30 and the valve body storage portion 39 of the injector valve 10. In addition, a recess 42 into which the tip of the valve body storage portion 39 is inserted is formed on the bottom surface of the main body fitting portion 61. Therefore, when the injector valve 10 is inserted into the main body fitting portion 61, the casing 30 or the valve body storage portion 39 and the main body fitting portion 61 are fitted as shown in FIG. The tip side is inserted. Connection portions 67 and 68 communicating with the main body fitting portion 61 are provided at positions corresponding to the lower side of the main body fitting portion 61 on the side surfaces 65 and 66 of the ejection side joint 47. The connection part 67 is a part to which the pump 15 is connected, and the connection part 68 is a part for discharging the fuel injected from the injector valve 10.

  The bulging portion 62 is provided at a position adjacent to the main body fitting portion 61 of the ejection side joint 47, and is provided at a position facing the storage portion 52 when the introduction side joint 46 is overlapped. . Since the bulging portion 62 is open on the top surface 60 side, when the ejection side joint 47 is covered with the introduction side joint 46, the housing portion 52 and the bulging portion 62 accommodate the connection terminal 38 of the injector valve 10. A space is formed.

  As shown in FIG. 4, the introduction side joint 46 is superposed on the top surface 60 side of the ejection side joint 47 so as to cover the bottom surface 50 of the introduction side joint 51 from above, thereby housing the injector valve 10. The part 70 and the terminal accommodating part 71 which accommodates the connection terminal 38 which protrudes from the casing 30 of the injector valve 10 are formed. The injector valve 10 is accommodated in the housing 70 so that the fuel inlet 35 faces the introduction-side joint 51 side and the fuel outlet 36 faces the ejection-side joint 52 side. Further, the connection terminal 38 of the injector valve 10 is accommodated in the terminal accommodating portion 71. The wiring connected to the connection terminal 38 of the injector valve 10 is led out from the wiring lead-out hole 58.

  The end of the injector valve 10 on the fuel inlet 35 side is inserted into the recess 53 of the introduction side joint 46. A gap between the injector valve 10 and the recess 53 is sealed by an O-ring 43 attached to the recess 40 of the injector valve 10. Therefore, fuel does not leak from the gap between the injector valve 10 and the recess 53, and the vibration of the injector valve 10 hardly propagates to the introduction side joint 46.

  The end of the injector valve 10 on the fuel outlet 36 side is inserted into the main body fitting portion 61 of the ejection side joint 47. A gap between the injector valve 10 and the main body fitting portion 61 is sealed by an O-ring 45 attached to a recess 41 provided on the fuel outlet 36 side of the injector valve 10. Therefore, fuel does not leak from the gap between the valve body storage part 39 of the injector valve 10 and the main body fitting part 61. Further, since the O-ring 45 is made of rubber, it has elasticity. Therefore, the vibration and impact in the axial direction of the injector valve 10 generated by the reciprocating motion of the actuator 31 can be absorbed. Further, since the O-ring 45 and the valve body storage part 39 are formed of different materials and their natural frequencies are significantly different, the vibration generated in the valve body storage part 39 is not amplified.

  On the other hand, the valve body storage portion 39 to which the O-ring 45 is attached is a portion that is not covered with the casing 30 and is a portion where vibration and noise are likely to leak to the outside. Furthermore, since the valve body storage part 39 is a part in which the valve body 33 is housed, the valve body storage part 39 is also a part in which vibration and noise are likely to occur as the valve body 33 is opened and closed. However, in this embodiment, since the O-ring is interposed between the injector valve 10 and the main body fitting portion 61, the vibration generated by the drive of the injector valve 10 is absorbed by the O-ring 45, and the introduction side joint 46 hardly propagates. Therefore, in the combustion device 2 of the present embodiment, the metallic noise generated by driving the injector valve 10 hardly leaks to the outside.

  In the combustion apparatus 1 of the present embodiment, the injector valve 10 has a structure in which both ends are supported by the introduction side joint 46 and the ejection side joint 47 via O-rings 43 and 45. Therefore, propagation of vibrations generated by driving the injector valve 10 can be reliably prevented, and axial blurring of the injector valve 10 can be suppressed to a minimum.

  Further, a gap between the ejection side joint 47 and the injector valve 10 is filled with a silicon filler, and surrounds the casing 30 and the valve body storage portion 39 of the injector valve 10. The silicon filler is an elastic member similar to the O-rings 43 and 45, and can absorb shocks and vibrations. Further, since the filler and the valve body storage part 39 are made of materials and their natural frequencies are significantly different from each other, the vibration generated in the valve body storage part 39 is not amplified. Therefore, most of the noise and vibration generated by driving the injector valve 10 is absorbed by the filler filled in the ejection side joint 47 and does not leak outside.

  In the above-described embodiment, an example in which silicon resin is injected as a filler into the ejection side joint 47 is illustrated. However, when the vibration of the injector valve 10 is relatively small, a structure in which the filler is not filled can be used. It is. Moreover, since the combustion apparatus 2 of the above-described embodiment exemplifies the structure in which the filler is filled only on the ejection side joint 47 side because vibration and noise generated in the valve body storage portion 39 are large, the structure of the injector valve 10 is illustrated. It is also possible to adopt a structure in which only the introduction side joint 46 side is filled with a filler, or a structure in which both the introduction side joint 46 and the ejection side joint 47 are filled with a filler.

  Moreover, in the above-described embodiment, the example in which the ejection side joint 47 is filled with silicon resin is illustrated, but any filler may be filled in the introduction side joint 46 or the ejection side joint 47. More specifically, the filler to be filled in the introduction side joint 46 or the ejection side joint 47 may be a solid filler obtained by cutting rubber or resin, or a resin filler such as a urethane filler or an epoxy filler. Any filler such as a material may be used.

  Further, as shown in FIG. 8, the introduction side joint 46 and the ejection side joint 47 are provided with a fitting concave portion 48 on the bottom surface 50 of the introduction side joint 46, and the fitting convex portion 48 is fitted on the top surface 60 of the ejection side joint 47. It is also possible to employ a configuration in which mating projections 49 that can be mated are provided. According to such a configuration, it is possible to prevent displacement of the introduction side joint and the ejection side joint due to the propagation of the vibration generated in the injector valve 10. Therefore, the closed state of the housing part 70 in which the injector valve 10 is disposed does not change, and the vibration of the intermittent on-off valve and noise leakage associated with the combustion drive can be suppressed to the minimum.

  In the above-described embodiment, the configuration in which the annular O-rings 43 and 45 are attached to the injector valve 10 as an elastic member that buffers vibration and noise generated in the injector valve 10 is illustrated, but the present invention is limited to this. It is not something. More specifically, the elastic member attached to the injector valve 10 may be the elastic member 73 shown in FIG. The elastic member 73 shown in FIG. 9 is entirely made of rubber, and is composed of a cylindrical main body portion 73a that matches the valve body storage portion 39, and a flange portion 73b provided on one end side of the main body portion 73a. Has been. When the injector valve 10 is connected to the ejection side joint 47 using the elastic member 73, the main body portion 73 a is sandwiched between the recess 42 provided on the bottom surface of the main body fitting portion 61 and the valve body housing portion 39 of the injector valve 10. The flange portion 73 b is sandwiched between the casing 30 and the bottom surface of the main body fitting portion 61.

  When the injector valve 10 is connected to the ejection side joint 47 using the elastic member 73, the gap between the concave portion 42 and the valve body storage portion 39 of the injector valve 10 is filled with the main body portion 73a, so that the shaft shake of the injector valve 10 is minimized. While suppressing to the limit, the propagation of vibration of the injector valve 10 can be further reduced.

  Further, the flange 73 b of the elastic member 73 can fill a gap formed in the direction of reciprocation of the actuator 31 by the injector valve 10 and the ejection side joint 47. Therefore, the flange portion 73 b can absorb the axial vibration of the injector valve 10 due to the reciprocating motion of the actuator 31.

  In the combustion apparatus of the present invention, the filler injected into the housing 70 is preferably made of a material different from that of the introduction side joint and the ejection side joint. In the above-described embodiment, since the natural frequency of the silicon resin that is the filler injected into the housing 70 and the metal that constitutes the introduction side joint and the ejection side joint are significantly different, the vibration of the injector valve 10 is reduced. Amplification does not occur. Therefore, according to the configuration described above, vibration propagation and amplification of the injector valve 10 hardly occur, and noise generated when the injector valve 10 is driven hardly leaks.

  In the above-described embodiment, the combustion apparatus 2 is configured such that an introduction side joint 80 and an ejection side joint 81 as shown in FIG. 10 are connected to the injector valve 10 in place of the introduction side joint 46 and the ejection side joint 47 described above. It may be. Hereinafter, the structure of the introduction side joint 80 and the ejection side joint 81 will be described.

  The introduction side joint 80 is entirely made of metal, and is a member that houses a portion of the casing 30 of the injector valve 10 on the fuel inlet 35 side as shown in FIGS. The introduction side joint 80 is open on the bottom surface 82 side, and a valve storage portion 83 that stores most of the casing 30 of the injector valve 10 is formed. The valve housing 83 is formed with a recess 86 that is substantially the same diameter as the fuel inlet 35 side of the injector valve 10 and is recessed on the top surface 85 side.

  Further, a pipe connection portion 56 is provided on the top surface 85 side of the introduction side joint 80 in the same manner as the introduction side joint 46 described above. A communication hole 57 provided in the pipe connection portion 56 communicates with the recess 86.

  On the other hand, the ejection side joint 81 is a metal member as a whole, and is a member connected to the fuel outlet 36 side of the injector valve 10. The ejection side joint 81 is roughly configured by a valve connection part 87 connected to the injector valve 10 and a main body part 88 connected to the fuel injection nozzle 3 and the pump 15.

  The valve connecting portion 87 is formed by a flat portion 90 that is substantially the same shape and flat as the bottom surface 82 of the introduction side joint 80 described above, and a concave portion 91 that matches the fuel outlet 36 of the injector valve 10. It communicates with the portion 88 side. Further, the main body portion 88 includes a connection portion 92 connected to the pump 15 and a connection portion 93 that discharges fuel ejected from the fuel outlet 36 of the injector valve 10.

  The introduction side joint 80 and the ejection side joint 81 are overlapped and integrated so that the bottom surface of the introduction side joint 80 covers the valve connecting portion 87 as shown in FIG. A housing portion 95 is formed by the storage portion 83 and the flat portion 90. The injector valve 10 is accommodated in the housing portion 95 so that the fuel inlet 35 faces the introduction side joint 80 and the fuel outlet 36 faces the ejection side joint 81.

  A sound insulation wall 96 surrounding the injector valve 10 is provided inside the housing 92. The sound insulation wall 96 is a rubber-made cylindrical member, and is in contact with the valve accommodating portion 83 of the introduction side joint 80 forming the housing 92 as shown in FIG. That is, the housing 92 has a double-walled structure including the valve storage portion 83 and the sound insulation wall 96. The vibration and noise generated in the injector 10 are transmitted to the valve housing 83 after being significantly attenuated by the sound insulation wall 93. Further, the introduction side joint 80 is made of metal, whereas the sound insulating wall 96 is made of rubber, and the natural frequency of both is greatly different, and vibration and noise amplification do not occur. Therefore, the vibration and noise described above are extremely small, and the noise generated by the drive of the injector valve 10 is of a magnitude that can be canceled out by the combustion noise generated by the combustion drive.

  The end on the fuel inlet 35 side and the end on the fuel outlet 36 side of the injector valve 10 are inserted into the recess 86 of the introduction side joint 80 and the recess 91 of the ejection side joint 81, respectively. The gap between the injector valve 10 and the recesses 86 and 91 is sealed by the O-rings 43 and 45, and fuel leakage from the gap between the injector valve 10 and the recesses 86 and 91 is prevented. Further, since the O-rings 43 and 45 are both made of rubber and have elasticity, vibration generated in the injector valve 10 can be absorbed by the O-rings 43 and 45. That is, the O-ring 43 can absorb the vibration generated in the radial direction of the injector valve 10 and prevent the shaft shake of the injector valve 10. Further, the O-ring 45 can absorb the force generated in the reciprocating direction of the injector valve 10.

  Further, instead of the introduction side joint 80 described above, an introduction side joint 97 having a structure as shown in FIG. 12 may be employed. Hereinafter, the introduction side joint 97 will be described with reference to the drawings. Since the introduction side joint 97 has substantially the same configuration as the introduction side joint 80 described above, common parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  Like the introduction side joint 80, the introduction side joint 97 is entirely made of metal, and includes a main body part 98, a nozzle holder part 100 of the fuel injection nozzle 3, and a branch part 101 connected to the pump 15. . The main body 98 is a main part of the introduction side joint 97, and the bottom surface 102 side is open like the introduction side joint 80 described above. The main body 98 has substantially the same structure as the introduction side joint 80. That is, the main body portion 98 has a valve storage portion 87 that stores the injector valve 10. The valve housing 87 is formed with a recess 91 into which the end of the injector valve 10 on the fuel inlet 35 side can be fitted. A space between the valve housing 87 and the injector valve 10 is filled with a silicon filler.

  The main body 98 has a nozzle connection pipe 103 that communicates with the valve housing 87 inside. A nozzle holder 100 is formed on the top surface 105 side of the main body 98. A nozzle mounting hole 106 for mounting the fuel injection nozzle 3 is formed in the nozzle holder portion 100. The nozzle mounting hole 106 communicates with the nozzle connection pipe 103. Therefore, the fuel that returns without being injected at the fuel injection nozzle 3 flows into the injector valve 10 mounted on the main body 98 through the nozzle connection pipe 103.

  The branch portion 101 is a portion branched from the main body portion 98, and a pump connection pipe 107 through which fuel can flow is formed. The pump connection pipe 107 communicates with the nozzle mounting hole 106 formed in the main body 98. That is, the branch portion 101 forms a pipe connecting the pump 15 that is a part of the fuel forward path 11 and the fuel injection nozzle 3.

  The introduction side joint 97 described above is connected and integrated with the injection side joint 81 in the same manner as the introduction side joint 80 described above. That is, the introduction side joint 97 is overlapped and integrated so that the bottom surface 102 faces the top surface 105 of the injection side joint 81. A housing part 95 surrounded by the valve storage part 87 of the introduction side joint 97 and the flat part 90 of the injection side joint 81 is formed. Since the injector valve 10 is surrounded by the housing part 95, the noise generated by driving the injector valve 10 is attenuated on the wall surface forming the housing part 95 and hardly leaks to the outside. Furthermore, since the housing portion 95 of the introduction side joint 97 is filled with the filler, most of the noise or vibration of the injector valve 10 is absorbed by the filler. Therefore, if the injector valve 10 is connected using the introduction side joint 97 and the injection side joint 81, noise and vibration in the injector valve 10 can be minimized.

  In addition, the introduction side joint 97 includes a nozzle holder part 100 and a branch part 101 in addition to the main body part 98 for connecting the injector valve 10, and a nozzle connection pipe 103 that connects the injector valve 10 and the fuel injection nozzle 3. A pump connection pipe 107 that connects the fuel injection nozzle 3 and the pump 15 is integrally formed. Therefore, according to the introduction side joint 97, the fuel circuit for supplying the fuel to the fuel injection nozzle 3 can be simplified, and the combustion apparatus 2 can be easily assembled. Moreover, if the introduction side joint 97 described above is employed, the number of parts of the combustion device 2 can be reduced, and the manufacturing cost can be reduced.

It is the front view which fractured | ruptured a part of principal part of the hot water supply apparatus of this embodiment. It is a schematic diagram which shows the fuel system | strain in the combustion apparatus shown in FIG. It is sectional drawing of the injector valve which the combustion apparatus shown in FIG. 1 has. It is a perspective view which shows the connection state of the injector valve shown in FIG. 3, an introductory side coupling | joint, and an ejection side coupling | joint. It is a perspective view which shows the state which looked at the introduction side coupling shown in FIG. 4 from the bottom face side. FIG. 5 is a cutaway view of the ejection side joint shown in FIG. 4. It is sectional drawing which shows the state which connected the injecting side coupling and the ejection side coupling to the injector valve shown in FIG. (A) is a perspective view which shows the deformation | transformation embodiment of the introductory side joint shown in FIG. 4, (b) is a perspective view which shows the deformation | transformation embodiment of the ejection side joint. (A) is a perspective view which shows the deformation | transformation embodiment of the elastic member with which the injector valve shown in FIG. 3 is mounted | worn, (b) introduces the injector valve shown in FIG. 3 using the elastic member shown to (a). It is sectional drawing which shows the state connected to the side coupling and the ejection side coupling. It is a perspective view which shows another embodiment of this invention. It is AA sectional drawing of FIG. It is a front view which shows another embodiment of this invention. It is a front view which shows the conventional hot-water supply apparatus. It is a front view which shows the fuel system | strain in the conventional combustion apparatus. It is sectional drawing of the proportional valve which the conventional combustion apparatus has.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water supply apparatus 2 Combustion apparatus 3 Fuel injection nozzle 10 Injector valve 35 Fuel inflow port 36 Fuel outflow port 43, 45 O-ring 46 Introduction side joint 47 Injection side joint 48 Fitting recessed part 49 Fitting convex part 70 Housing part 73 Buffer member 80 Introduction side joint 81 Ejection side joint 95 Housing part 96 Sound insulation wall 97 Introduction side joint

Claims (7)

In a combustion apparatus having spray means for spraying fuel and a fuel circuit through which the fuel flows,
The fuel circuit has a fuel forward path connected to the spraying means, and a fuel return path for returning fuel remaining without being sprayed in the spraying means to the fuel forward path,
In the middle of the fuel return path, an intermittent on-off valve that can be opened and closed periodically is provided,
An introduction side joint is connected to the fuel introduction side of the intermittent on-off valve, and an ejection side joint is connected to the fuel ejection side of the intermittent on-off valve,
A part or all of the intermittent on-off valve is surrounded by a sound insulating member constituted by the introduction side joint and the ejection side joint,
The introduction side joint is provided with a pipe connection portion provided with a communication hole through which fuel passes, and the ejection side joint is connected with a connection portion for discharging fuel,
The intermittent on-off valve supplies fuel to the intermittent on-off valve from the pipe connection on the introduction side joint, and discharges fuel supplied through the intermittent on-off valve from the connection on the ejection side joint. Connected ,
A combustion apparatus , wherein an elastic member is interposed between a sound insulation member and an intermittent on-off valve, and fills a gap between the sound insulation member and the intermittent on-off valve . The combustion apparatus according to claim 1 , wherein a recess is provided in the introduction side joint and the ejection side joint, and an end of the intermittent on-off valve is inserted into the recess. The combustion apparatus according to claim 2 , wherein a gap between the intermittent on-off valve and the recess is sealed with an elastic member. The intermittent on-off valve has a built-in valve body and an actuator that periodically reciprocates to open and close the valve body.
The elastic member is interposed in the clearance gap formed in the direction of the reciprocating motion of the said actuator by the introduction side joint or a jet side joint, and an intermittent on-off valve, The Claim 1 thru | or 3 characterized by the above-mentioned. Combustion equipment. The fuel circuit includes a spraying means for spraying fuel, a fuel circuit through which the fuel flows, and a fuel pump for sending fuel to the spraying means. The introduction side joint or the ejection side joint is connected to the fuel pump and the spraying means. The combustion apparatus according to claim 1 , wherein the combustion apparatus is directly connected. The fuel forward path has a configuration in which a fuel tank, a solenoid valve, and a fuel pump that sends fuel to the spraying means are connected in series, and the fuel return path has one end connected to the spraying means and the other end connected to the fuel forward path. The combustion apparatus according to claim 1 , wherein the combustion apparatus is connected between the electromagnetic valve and the pump. The combustion apparatus according to any one of claims 1 to 6 , wherein the ejection side joint has a connection portion for connecting a fuel pump for sending fuel to the spraying means.

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