JP2015083859A - Fluid pressure responsive valve and combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid pressure responsive valve and a combustion device capable of suppressing erroneous detection of a combustion state of a burner.SOLUTION: A fluid pressure responsive valve 50 includes first and second chambers 51a and 51b for allowing first fluid to flow separately, a diaphragm 53, a valve rod 55, a valve body 56, a valve element 57, and a movement detecting device 58. The valve element 57 includes first and second closing parts C1 and C2 protrudingly formed respectively. The first closing part C1 is protruded to a valve seat 56c side of the valve body 56 compared to the second closing part C2. Both of the first and the second closing parts C1 and C2 are constituted to be seated on the valve seat 56c. The movement detecting device 58 detects axial movement of the valve rod 55 when the first closing part C1 is seated on the valve seat 56c.

Description

  The present invention relates to a fluid pressure responsive valve and a combustion apparatus.

  In a combustion apparatus having a hot water supply function, a water pressure responsive valve capable of opening and closing a flow path of a combustion gas by the pressure of water supplied from a water supply source is widely used. This water pressure responsive valve is generally composed of a diaphragm that is deformed by the pressure of water supply, a valve rod that moves according to the deformation of the diaphragm, a valve body that is connected to the valve rod, and a fuel gas that can be opened and closed by the valve body. And a valve body having a passage. For example, Japanese Patent Laying-Open No. 2012-132636 (Patent Document 1) discloses a combustion apparatus provided with a water pressure responsive valve.

JP 2012-132636 A

  Some combustion devices having a hot water supply function monitor the combustion state of the burner by detecting the flame of the burner with a frame rod. If the timing at which the flame of the burner is detected by the frame rod is different from the timing at which the combustion gas passage is opened and closed, the combustion state of the burner may be erroneously detected. When the combustion state of the burner is erroneously detected, the combustion device is controlled to stop. When the combustion device stops in this way, the convenience for the user deteriorates.

  On the other hand, it is conceivable that the timing at which the flame of the burner is detected by the frame rod and the timing at which the combustion gas passage is opened and closed are matched by using a water pressure responsive valve as described in the above publication. However, the opening and closing of the passage may not be performed correctly due to the tilt of the valve body that opens and closes the passage of the combustion gas. In this case, when the combustion gas leaks from the combustion gas passage, the difference between the timing at which the flame of the burner is detected by the frame rod and the opening / closing timing of the combustion gas passage is increased. As a result, there is a problem that the combustion state of the burner is erroneously detected.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a fluid pressure responsive valve and a combustion device that can prevent the combustion state of the burner from being erroneously detected.

  The fluid pressure responsive valve of the present invention includes first and second chambers for separately flowing a first fluid, a diaphragm, a valve rod, a valve body, a valve body, and a movement detection device. ing. The diaphragm is configured to be deformable by a pressure difference between the first fluid that divides the first and second chambers and flows to the first and second chambers. The valve rod has one end and the other end, a diaphragm is connected to one end side, and the valve rod is configured to be movable in the axial direction by deformation of the diaphragm. The valve body has a flow path for circulating the second fluid, a passage communicating with the flow path, and a valve seat provided around the passage. The valve body is disposed on the other end side of the valve rod in the flow path, and is configured to be able to open and close the passage by being attached to and detached from the valve seat by the movement of the valve rod. The movement detection device is connected to the valve rod and detects the movement of the valve rod in the axial direction. The valve body includes first and second closing portions each formed in a convex shape. The first closing part is configured to protrude to the valve seat side from the second closing part. Both the first and second closing portions are configured to be seated on the valve seat. The movement detection device is configured to detect the movement of the valve rod in the axial direction when the first closing portion is seated on the valve seat.

  According to the fluid pressure responsive valve of the present invention, since the first closing portion protrudes more toward the valve seat than the second closing portion, the passage is closed when the first closing portion is seated on the valve seat. be able to. Then, the movement of the valve body can be stopped by the second closing portion seated on the valve seat in a state where the passage is closed by the first closing portion seated on the valve seat. Therefore, even if the valve body is tilted and the second closing portion comes into contact with the valve seat, the passage can be closed by the first closing portion seating on the valve seat. For this reason, it can suppress that a 2nd fluid leaks from a channel | path. The movement detection device detects the movement of the valve rod in the axial direction when the first closing portion is seated on the valve seat. Therefore, even when the valve body is tilted and the second closing part comes into contact with the valve seat, by matching the timing at which the first closing part is seated on the valve seat with the timing at which the flame of the burner is detected by the frame rod, The timing for closing the passage and the timing for detecting the flame of the burner with the frame rod can be accurately matched. Thereby, it can suppress that the combustion state of a burner is detected accidentally.

  In the fluid pressure responsive valve, the second closing portion is seated on the valve seat by moving the valve body further to the valve seat side in a state where the first closing portion is seated on the valve seat. Is configured to do. For this reason, the second closing part can be seated on the valve seat by moving the valve body further to the valve seat side with the first closing part seated on the valve seat. Therefore, the movement of the valve body can be stopped by the second closing portion seated on the valve seat in a state where the passage is closed by the first closing portion seating on the valve seat. Therefore, even if the valve body is tilted and the second closing portion comes into contact with the valve seat, the passage can be closed by the first closing portion seating on the valve seat. For this reason, the movement of the valve element can be reliably stopped while suppressing the second fluid from leaking from the passage.

  In the fluid pressure responsive valve, the valve body is in an open state in which neither of the first and second closing parts is seated on the valve seat, only the first closing part, and the first and second closing parts. Both of these are configured to be in a closed state where they are seated on the valve seat. For this reason, the second fluid can be flowed by opening the passage in the valve open state, and the second fluid can be stopped by closing the passage in the valve closed state.

  In the fluid pressure responsive valve described above, the first and second closing portions are formed in an annular shape, and the first closing portion is disposed on the inner peripheral side of the second closing portion. Thereby, it can suppress that a 2nd fluid leaks from a channel | path also by a 2nd closing part in addition to a 1st closing part.

  In the fluid pressure responsive valve, the first closing portion is configured to be able to bend and deform in the radial direction of the valve rod by movement in the axial direction of the valve rod, and the second closing portion is configured to be a shaft of the valve rod. It is configured to be compressible and deformable in the axial direction of the valve rod by moving in the direction. For this reason, even if the valve body moves in the axial direction of the valve rod after the first closing portion is seated on the valve seat, the first closing portion can be maintained in the seated state on the valve seat. Furthermore, the second closing portion can firmly contact the valve seat.

  In the fluid pressure responsive valve, the movement detection device is configured to detect the movement of the valve rod in the axial direction by turning on and off the microswitch. Thereby, the movement of the valve rod in the axial direction can be reliably detected.

  The fluid pressure responsive valve further includes an inclination prevention rod that is connected to the valve body from the opposite side of the valve rod to the valve body and is movable in the axial direction of the valve rod. Thereby, the inclination of a valve body can be suppressed.

  A combustion apparatus according to the present invention includes the fluid pressure responsive valve, a heat exchanger, a burner, and a frame rod. The first fluid is water and the second fluid is combustion gas. The heat exchange is configured such that water supplied from the fluid pressure responsive valve can flow. The burner is for heating the water flowing through the heat exchanger by burning the combustion gas supplied from the fluid pressure responsive valve. The frame rod is configured to detect the burner flame. The frame rod is configured to detect the flame of the burner when the movement detecting device detects the axial movement of the valve rod.

  According to the combustion apparatus of the present invention, the timing for closing the passage of the fluid pressure responsive valve and the timing for detecting the flame of the burner with the frame rod can be accurately matched. Thereby, the combustion apparatus which can suppress that the combustion state of a burner is detected accidentally can be obtained.

  As described above, according to the present invention, it is possible to suppress erroneous detection of the combustion state of the burner.

It is a schematic diagram showing roughly the composition of the combustion device in one embodiment of the present invention. It is sectional drawing which shows roughly the structure of the fluid pressure responsive valve in one embodiment of this invention. It is sectional drawing which shows roughly the structure of the valve body in one embodiment of this invention. It is a top view which shows roughly the structure of the valve body in one embodiment of this invention. It is a top view which shows roughly the state in which the valve body in one embodiment of this invention left | separated from the valve seat. It is a top view which shows roughly the state which the 1st closing part of the valve body in one embodiment of this invention seated on the valve seat. It is a top view which shows roughly the state which the 1st and 2nd closing part of the valve body in one embodiment of this invention seated on the valve seat.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First, the configuration of the combustion apparatus (hot water heater) of the present embodiment will be described. In the present embodiment, the case where the first fluid is water and the second fluid is combustion gas will be described.

  A bathroom-installed combustion apparatus 1 (hereinafter also simply referred to as a combustion apparatus (hot water heater) 1) according to the present embodiment is suitable for a balanced bath having a structure in which an intake port and an exhaust port are outside the bathroom. Is used. Referring to FIG. 1, combustion apparatus 1 has a hot water supply system that supplies hot water to currant 40 and shower 41, and a bath circulation system that raises the temperature of hot water in bathtub 42. The bathtub is configured to be able to store heated water supplied from the combustion device 1. This combustion apparatus 1 includes a housing 2, a hot water supply side heat exchanger (heat exchanger) 3, a bath side heat exchanger 4, a seed fire holding unit 5, a hot water supply side combustion unit 6, and a bath side combustion unit 7. And the operation part 8 and the controller 9 (control means) are provided as a main part. And the hot water supply side heat exchanger 3, the bath side heat exchanger 4, the seed-fire holding | maintenance part 5, the hot water supply side combustion part 6, and the bath side combustion part 7 are incorporated in the inside of the substantially sealed housing 2 at least. Has been.

  The combustion apparatus 1 does not include scavenging means (for example, a ventilation fan) that forcibly exhausts the unburned gas in the housing 2 to the outside, and has a structure that discharges the unburned gas to the outside by natural convection. ing.

  One end of the hot water supply side heat exchanger 3 is continuous with a water supply source such as a water supply, and the other end is continuous with hot water taps such as the curan 40 and the shower 41. The hot water supplied from the water supply source can be heated and supplied to the hot water tap.

  One end of the bath-side heat exchanger 4 is communicated with the lower layer portion of the bathtub 42, and the other end is communicated with the upper layer portion of the bathtub 42. When the bath is replenished, hot water taken from the lower layer is heated and introduced into the upper layer, so that hot water in the bathtub 42 can be circulated and heated.

  The seed-fire holding unit 5 includes a pilot burner 12, a spark plug 13, an igniter 14, and a thermocouple 15.

  The pilot burner 12 is supplied with fuel gas from the gas supply source via the seed gas passage 16. The pilot burner 12 can be ignited by the spark plug 13 and the igniter 14 connected to the spark plug 13. Further, the thermocouple 15 can detect the presence or absence of the pilot burner 12 (the presence or absence of combustion).

  The hot water supply side combustion unit 6 includes a hot water supply side burner 21 (burner) and a hot water supply side frame rod (frame rod) 22 so that the hot water supply side heat exchanger 3 can be heated. The hot water supply side burner 21 is for heating the water flowing through the hot water supply side heat exchanger 3. The hot water supply side burner 21 receives the supply of fuel gas from the gas supply source via the hot water supply side gas passage 23. The hot water supply side burner 21 can be ignited by the seed fire held by the pilot burner 12. The hot water supply side frame rod 22 can detect the presence or absence of flame (combustion presence or absence) in the hot water supply side burner 21.

  The bath-side combustion unit 7 includes a bath-side burner 27 and a bath-side frame rod 28 and can heat the bath-side heat exchanger 4. The bath-side burner 27 is supplied with fuel gas from the gas supply source via the bath-side gas passage 29. The bath-side burner 27 can be ignited by the seed fire held by the pilot burner 12. The bath side frame rod 28 can detect the presence or absence of flame in the bath side burner 27 (the presence or absence of combustion).

  The operation unit 8 includes an operation knob 31, a cam mechanism 32, and a switching valve unit 33. The operation knob 31 is a dial type operation knob and is externally mounted on the housing 2. Then, when the user operates the operation knob 31, an operation related to the operation setting of the combustion apparatus 1 can be performed. At this time, the cam mechanism 32 acts on the switching valve portion 33 and the original gas valve 34 according to the operation of the operation knob 31. In addition, the operation unit 8 includes a switch so that information regarding the operation position of the operation knob 31 can be detected.

  The switching valve unit 33 is located downstream of the original gas valve 34 in the fuel gas flow direction and upstream of the seed gas flow channel 16, the hot water supply side gas flow channel 23, and the bath side gas flow channel 29 in the fuel gas flow direction. doing. Then, the switching valve unit 33 opens or closes each of the seed fire gas flow path 16, the hot water supply side gas flow path 23, and the bath side gas flow path 29 according to the operation of the operation knob 31. That is, by operating the switching valve unit 33, any of the seed-fire gas channel 16, the hot water supply side gas channel 23, and the bath side gas channel 29 is opened, and the arbitrary channel is closed. . As a result, the fuel gas can flow only in an appropriate flow path.

  The original gas valve 34 is a magnet type safety valve. The original gas valve 34 uses the cam mechanism 32 of the operation unit 8 only when the valve is opened, and once the valve is opened, the original gas valve 34 can be kept open by the power of the dry battery or the thermoelectromotive force. Then, the valve is closed by releasing the valve opening holding force in a state where the energization is stopped (a state where the thermoelectromotive force is reduced).

  The original gas valve 34 is closed to close all the gas flow paths of the combustion apparatus 1 such as the seed fire gas flow path 16, the hot water supply side gas flow path 23, and the bath side gas flow path 29. be able to.

  A fluid pressure responsive valve 50 is provided upstream of the hot water supply side heat exchanger 3 in the hot water flow direction. The hot water supply side heat exchanger 3 is configured to be able to circulate hot water supplied from the fluid pressure responsive valve 50. The fluid pressure responsive valve 50 normally closes the hot water supply side gas flow path 23 and opens when the water pressure of the water passing through the fluid pressure responsive valve 50 rises. In other words, when water enters the hot water supply side heat exchanger 3 from the water supply source, the water supplied from the water supply source passes through the fluid pressure responsive valve 50, and the fluid pressure responsive valve 50 detects the water pressure to detect the water pressure. The gas flow path 23 is opened. Further, the fluid pressure responsive valve 50 is provided with a movement detection device to be described later, and can detect information related to opening and closing of the fluid pressure responsive valve 50.

  The controller 9 has a control board including a microcomputer (not shown) that controls each part of the combustion apparatus 1, and can control the operation of each part of the combustion apparatus 1.

  Specifically, the controller 9 is connected to the thermocouple 15, the hot water supply side frame rod 22, and the bath side frame rod 28, respectively, and whether or not the pilot burner 12, the hot water supply side burner 21, and the bath side burner 27 have flame (presence of combustion). It is possible to get information about.

  The controller 9 is connected to the original gas valve 34 and can switch between the open state and the closed state of the original gas valve 34.

  Furthermore, the controller 9 is connected to the operation unit 8 and the fluid pressure responsive valve 50, and can acquire information related to operations performed by the operation unit 8 and information related to opening and closing of the fluid pressure responsive valve 50. It has become.

  Then, with reference to FIGS. 2-4, the structure of the fluid pressure responsive valve 50 of this Embodiment is demonstrated in detail.

  As shown in FIG. 2, the fluid pressure responsive valve 50 includes a diaphragm case 51, first and second chambers 51 a and 51 b, a first shaft body 52, a diaphragm 53, and a second shaft body 54. The valve rod 55, the valve body 56, the valve body 57, the movement detection device 58, the holding member 59, the tilt prevention rod 60, the rod support member 61, the springs 62 and 63, the bearing member 64, and the spring 65 and seal members 66, 67, 68.

  A first shaft body 52, a diaphragm 53, and a second shaft body 54 are accommodated in the diaphragm case 51. The diaphragm case 51 has first and second chambers 51 a and 51 b partitioned by a diaphragm 53 inside. The first shaft body 52 is accommodated in the first chamber 51a, and a part of the second shaft body 54 is accommodated in the second chamber 51b. The first chamber 51a and the second chamber 51b are for separately circulating the water supplied from the water supply source. The first chamber 51a is configured such that water supplied from a water supply source flows in, and the second chamber 51b is configured such that the water pressure can be smaller than that of the first chamber 51a due to the venturi effect. ing. The diaphragm 53 is configured to be deformable in the direction of arrow A in the figure by the pressure difference between the water flowing through the first chamber 51a and the water flowing through the second chamber 51b. The first shaft body 52 and the second shaft body 54 are connected to the diaphragm 53 from opposite directions with respect to the diaphragm 53. The first shaft body 52 and the second shaft body 54 are arranged coaxially in the direction of arrow A in the drawing.

  The valve rod 55 is configured to be movable in the axial direction by deformation of the diaphragm 53. The valve rod 55 has one end and the other end, a shaft main body portion 55a extending in the axial direction, and an extending portion 55b extending in a direction intersecting the axial direction from the shaft main body portion 55a. A diaphragm 53 is connected to one end side of the valve rod 55. Specifically, a second shaft body 54 connected to the diaphragm 53 is connected to one end of the valve rod 55. The other end of the valve rod 55 is inserted into the insertion hole H1 of the valve body 57. In the state where the diaphragm 53 is not deformed, a gap GP is provided in the axial direction between the other end of the valve rod 55 and the insertion hole H1 of the valve body 57.

  The shaft main body portion 55 a of the valve rod 55 is arranged coaxially with the second shaft body 54. The shaft main body portion 55 a of the valve rod 55 is disposed at the center in the radial direction of the holding member 59 and is connected to the holding member 59. The extending portion 55 b of the valve rod 55 is configured to be connectable to the movement detection device 58.

  The movement detection device 58 is connected to the valve rod 55 and configured to detect movement of the valve rod 55 in the axial direction. The hot water supply side frame rod 22 is configured to detect the flame of the hot water supply side burner 21 when the movement detector 58 detects the movement of the valve rod 55 in the axial direction.

  The valve main body 56 has a flow path 56a for circulating combustion gas, a passage 56b communicating with the flow path 56a, and a valve seat 56c provided around the passage 56b. With reference to FIG. 1, the flow path 56 a is connected to the seed fire gas flow path 16 and the bath side gas flow path 29 via the switching valve portion 33, and the passage 56 b is connected to the hot water supply side gas flow path 23. The passage 56b has an opening communicating with the flow path 56a. A valve seat 56c is formed so as to surround the opening.

  A valve body 57, a holding member 59, a tilt prevention rod 60, a rod support member 61, springs 62 and 63, a bearing member 64, a spring 65, and a seal member 66 are accommodated in the valve body 56. The valve body 57 is disposed on the other end side of the valve rod 55 in the flow path 56a. The valve body 57 is configured to be able to open and close the passage 56b by being attached to and detached from the valve seat 56c by the movement of the valve rod 55. The valve body 57 has a valve body main body portion 57a and a valve body abutting portion 57b attached to the valve body main body portion 57a. The valve body main part 57a is made of, for example, metal, and the valve body contact part 57b is made of, for example, rubber.

  Subsequently, the configuration of the valve body 57 will be described in detail with reference to FIGS. 3 and 4. The valve body 57 has an insertion hole H1 on the valve body abutting portion 57b side at the center in the radial direction, and an insertion hole H2 on the opposite side to the valve body abutting portion 57b. The insertion hole H1 is configured so that the valve rod 55 can be inserted, and the insertion hole H2 is configured so that the tilt prevention rod 60 can be inserted.

  Moreover, the valve body 57 has the 1st and 2nd closing part C1, C2 each formed in convex shape. The first and second closing portions C1 and C2 are formed so as to protrude from the valve seat 56c side surface of the valve body abutting portion 57b to the valve seat 56c side. The first closing portion C1 is configured to protrude to the valve seat 56c side from the second closing portion C2. Specifically, the first closing part C1 may protrude with a dimension of, for example, 0.3 ± 0.05 mm on the valve seat 56c side from the second closing part C2. Both the first and second closing portions C1 and C2 are configured to be seated on the valve seat 56c.

  The second closing portion C2 is configured to be seated on the valve seat 56c by moving the valve element 57 further to the valve seat 56c side in a state where the first closing portion C1 is seated on the valve seat 56c. . That is, the valve body 57 is in an open state where neither the first and second closing portions C1 and C2 are seated on the valve seat 56c, only the first closing portion C1, and the first and second closing portions C1. , C2 is configured to be in a closed state in which either of the valve seats 56c is seated on the valve seat 56c.

  The first closing portion C1 is configured to be able to bend and deform in the radial direction of the valve rod 55 by the movement of the valve rod 55 in the axial direction, and the second closing portion C2 is formed by the movement of the valve rod 55 in the axial direction. The valve rod 55 is configured to be compressible and deformable in the axial direction. The first closing portion C1 is inclined outward with respect to the axial direction of the valve rod 55 and extends toward the valve seat 56c, and the second closing portion C2 extends along the axial direction of the valve rod 55. Extends to the side. Specifically, the side wall on the center side of the valve body 57 of the first closing portion C1 is inclined at an angle of, for example, 60 ° with respect to the axial direction of the valve body 57, and the valve of the first closing portion C1 The side wall on the outer peripheral surface side of the body 57 is inclined with respect to the axial direction of the valve body 57 at an angle of 44.52 °, for example. The side wall on the center side of the valve body 57 of the second closing portion C2 is inclined at an angle of 24 °, for example, with respect to the axial direction of the valve body 57, and the outer peripheral surface of the valve body 57 of the second closing portion C2 The side wall is inclined at a smaller angle than the center side wall with respect to the axial direction of the valve element 57.

  As shown in FIG. 4, the first and second closing portions C <b> 1 and C <b> 2 are annularly configured. The first closing portion C1 is disposed on the inner peripheral side of the second closing portion C2. The first and second closing portions C1 and C2 are preferably arranged concentrically.

  Referring to FIG. 2 again, the movement detector 58 is configured to detect the movement of the valve rod 55 in the axial direction when the first closing portion C1 is seated on the valve seat 56c. Specifically, the movement detection device is configured to detect the movement of the valve rod 55 in the axial direction, for example, by turning on and off the microswitch.

  The tilt prevention rod 60 is connected to the valve body 57 from the opposite side of the valve rod 55 with respect to the valve body 57. The tilt prevention rod 60 is configured to be movable in the axial direction of the valve rod 55. The tilt prevention rod 60 is arranged coaxially with the valve rod 55. The tilt prevention rod 60 is disposed at the center in the radial direction of the rod support member 61 and the bearing member 64 and is supported by the bearing member 64 so as to be slidable in the axial direction.

  A spring 62 biases each other between a flange portion provided on the outer wall side of the rod support member 61 and a locking portion provided on the outer peripheral surface of the valve body 57 disposed to face the flange portion. Are arranged to be. Further, a spring 63 biases each other between a support portion provided on the inner wall side of the rod support member 61 and a holding portion provided on the inner wall side of the bearing member 64 disposed to face the support portion. Are arranged to be. A spring 65 is disposed between the holding member 59 and the valve body 57 so as to bias each other. These springs 62, 63, 65 are configured to be able to bias the valve body 57 in the axial direction of the valve rod 55.

  A seal member 66 is disposed between the outer wall of the holding member 59 and the inner wall of the valve body 56. The sealing member 66 suppresses leakage of combustion gas from between the holding member 59 and the inner wall of the valve body. A seal member 67 is disposed between the outer peripheral surface of the valve rod 55 and the inner wall of the diaphragm case 51. The seal member 67 suppresses combustion gas leakage from between the outer peripheral surface of the valve rod 55 and the inner wall of the diaphragm case 51. Further, a seal member 68 is disposed between the outer peripheral surface of the second shaft body 54 and the inner wall of the diaphragm case 51. The seal member 68 suppresses water leakage from between the outer peripheral surface of the second shaft body 54 and the inner wall of the diaphragm case 51. Each of the sealing members 66, 67, 68 may be an O-ring.

Next, the outline | summary of operation | movement of the combustion apparatus 1 shown to this Embodiment is demonstrated.
Referring to FIGS. 1 and 2 again, combustion apparatus 1 of the present embodiment can perform a hot water supply operation and a bath reheating operation, and these can be performed independently or in parallel.

  In the combustion apparatus 1 of the present invention, various operations are performed after performing the ignition operation. In the ignition operation of the combustion apparatus 1, first, the operation knob 31 is moved from the initial position to the ignition position. At this time, when the operation knob 31 is in the initial position, both the original gas valve 34 and the switching valve portion 33 are closed.

  When the operation knob 31 moves from the initial position to the ignition position, the original gas valve 34 is opened and the switching valve portion 33 opens the seed fire gas flow path 16. Then, fuel gas is supplied to the pilot burner 12. At this time, the controller 9 acquires information that the operation knob 31 has moved to the ignition position.

  When the controller 9 detects movement of the operation knob 31 to the ignition position, the pilot burner 12 is ignited. That is, the igniter 14 is turned on and the spark plug 13 is in an ignition state. Thereby, the pilot burner 12 is ignited. Next, the controller 9 confirms whether or not the pilot burner 12 is ignited. This confirmation is determined by whether or not the thermoelectromotive force in the thermocouple 15 exceeds a predetermined value indicating the presence of a flame. At this time, when ignition to the pilot burner 12 is confirmed, the controller 9 supplies power to the original gas valve 34 and maintains the original gas valve 34 in an open state. Then, the operation knob 31 automatically moves from the ignition position to the ignition position. With this, the ignition operation before the operation of the combustion apparatus 1 is completed.

  When performing the hot water supply operation, the operation knob 31 is shifted to the hot water supply position. As a result, the switching valve unit 33 opens the hot water supply side gas passage 23. Subsequently, when the hot water taps such as the currant 40 and the shower 41 are opened, hot water is supplied from the water supply source to the water inlet side of the hot water supply side heat exchanger 3. At this time, the fluid pressure responsive valve 50 detects the water pressure supplied to the hot water supply side heat exchanger 3 and opens the valve. That is, when both the switching valve portion 33 and the fluid pressure responsive valve 50 open the hot water supply side gas passage 23, the fuel gas flows into the hot water supply side gas passage 23. Then, the fuel gas is supplied to the hot water supply side burner 21 through the hot water supply side gas flow path 23, the seed light lit on the pilot burner 12 is transferred to the hot water supply side burner 21, and the hot water supply side burner 21 burns. Hot water supply operation is started. At this time, the combustion check and misfire determination of the hot water supply side burner 21 are performed by the hot water supply side frame rod 22.

  The hot water that has passed through the hot water supply side heat exchanger 3 and hot water that has passed through the bypass flow path 38 that connects the upstream and downstream sides of the hot water supply side heat exchanger 3 in the direction of water flow are mixed, and the currant 40 and the shower are mixed. Hot water of the required temperature is discharged from a hot water tap such as 41.

  When performing the bath chasing operation, the operation knob 31 is moved to the chasing position. As a result, the switching valve unit 33 opens the bath-side gas flow path 29, and the fuel gas is supplied to the bath-side burner 27 through the bath-side gas flow path 29. Then, the seed fire lit on the pilot burner 12 is transferred to the bath-side burner 27, and the bath-side burner 27 is burned to start the bath reheating operation. At this time, the combustion confirmation and misfire determination of the bath-side burner 27 are performed by the bath-side frame rod 28.

  Next, the operation of the fluid pressure responsive valve according to the present embodiment will be described in more detail with reference to FIGS. 2 and 5 to 7.

  As shown in FIG. 2, when performing a hot water supply operation, water is supplied from the water supply source to the first chamber 51a, and the pressure difference between the water flowing into the first chamber 51a and the water flowing into the second chamber 51b. As a result, the diaphragm 53 is deformed in a convex shape toward the valve rod 55 side. The valve element 57 connected to the valve rod 55 by the deformation of the diaphragm 53 is pushed to the opposite side of the diaphragm 53 with respect to the valve rod 55. As a result, as shown in FIG. 5, when the valve body 57 moves away from the valve seat 56c, the fuel gas flows from the flow path 56a to the passage 56b. At this time, the valve body 57 is in a valve open state in which neither of the first and second closing portions C1 and C2 is seated on the valve seat 56c.

  When the hot water supply operation is terminated, the supply of water from the water supply source to the first chamber 51a is stopped, and the pressure difference between the water flowing into the first chamber 51a and the water flowing into the second chamber 51b becomes small. As a result, the diaphragm 53 is deformed to return to the original state. Further, the valve element 57 is biased by the springs 62 and 63 toward the diaphragm 53 side. In this way, the valve body 57 moves to the diaphragm 53 side. Then, as shown in FIG. 6, first, the first closing portion C1 of the valve body 57 is seated on the valve seat 56c. At this time, the valve body 57 is in a closed state in which only the first closing portion C1 is seated on the valve seat 56c. Further, when the first closing portion C1 is seated on the valve seat 56c, the movement detection device 58 detects the movement of the valve rod 55 in the axial direction by turning on and off the microswitch. When the micro switch is turned on, the hot water supply side frame rod 22 is controlled to detect the presence or absence of flame in the hot water supply side burner 21. Thereby, the timing at which the first closing portion C1 is seated on the valve seat 56c can be matched with the timing at which the flame of the hot water supply side burner 21 is detected by the hot water supply side frame rod 22.

  Subsequently, as shown in FIG. 7, the second closing portion C2 of the valve body 57 is also seated on the valve seat 56c. That is, the second closing portion C2 is seated on the valve seat 56c by moving the valve body 57 further to the valve seat 56c side in a state where the first closing portion C1 is seated on the valve seat 56c. Also at this time, the valve body 57 is in a closed state in which both the first and second closing portions C1 and C2 are seated on the valve seat 56c. The first closing portion C1 is bent and deformed so as to warp the outer peripheral side of the valve body 57, and the second closing portion C2 is compressed and deformed in the axial direction of the valve rod 55. When the first closing portion C1 is seated on the valve seat 56c, the amount of deformation in the axial direction of the valve rod 55 becomes larger than when the second closing portion is seated on the valve seat 56c. That is, the first closing portion C1 is more easily deformed than the second closing portion C2.

  When the movement of the valve element 57 is stopped by the seating of the second closing portion C2 on the valve seat 56c, the urging force of the springs 62 and 63 does not act on the valve rod 55. Therefore, the movement of the valve rod 55 is maintained until the urging force of the spring 65 exceeds the water pressure that deforms the diaphragm 53. Thereafter, the valve rod 55 moves to the diaphragm 53 side when the difference between the water pressures of the first and second chambers 51a and 51b becomes small and the urging force of the spring 65 exceeds the water pressure for deforming the diaphragm 53. Then, the state shown in FIG. 2 is reached when the difference in water pressure between the first and second chambers 51a and 51b is eliminated.

Next, the effect of this Embodiment is demonstrated.
According to the fluid pressure responsive valve of the present embodiment, the first closing portion C1 protrudes closer to the valve seat 56c than the second closing portion C2, so the first closing portion C1 is seated on the valve seat 56c. By doing so, the passage 56b can be closed. Then, the movement of the valve element 57 is stopped by the second closing portion C2 being seated on the valve seat 56c in a state where the passage 56b is closed by the first closing portion C1 being seated on the valve seat 56c. Can do. Therefore, even if the valve body 57 is inclined and the second closing portion C2 comes into contact with the valve seat 56c, the passage 56b can be closed by the first closing portion seating on the valve seat 56c. For this reason, it is possible to suppress the leakage of the combustion gas from the passage 56b that occurs when the valve body 57 cannot close the passage 56b due to a single contact. Then, the movement detection device 58 detects the movement of the valve rod 55 in the axial direction when the first closing portion C1 is seated on the valve seat 56c. Therefore, even if the valve body 57 is tilted and the second closing portion C2 comes into contact with the valve seat 56c, the flame of the hot water supply side burner 21 is set at the timing when the first closing portion C1 is seated on the valve seat 56c. By matching with the timing detected at 22, the timing for closing the passage 56b and the timing for detecting the flame of the hot water supply side burner 21 by the hot water supply side frame rod 22 can be accurately matched. Thereby, it can suppress that the combustion state of the hot water supply side burner 21 is detected accidentally.

  Further, the first closing portion C1 is formed so as to be thinner than the second closing portion C2 so as to be more easily deformed than the second closing portion C2. For this reason, if the valve body 57 is configured so that only the first closing portion C1 is seated on the valve seat 56c, the first closing portion C1 is likely to break down due to a load when the valve body 57 is stopped. In the present embodiment, since the valve body 57 stops when the second closing portion C2 is seated on the valve seat 56c, the load on the first closing portion C1 can be reduced. Thereby, since the failure of the first closing portion C1 can be suppressed, the durability of the valve body 57 can be improved.

  In the fluid pressure responsive valve 50 of the present embodiment, the second closing portion C2 is moved by moving the valve body 57 further toward the valve seat 56c while the first closing portion C1 is seated on the valve seat 56c. It can be seated on the valve seat 56c. Accordingly, the movement of the valve element 57 is stopped by the second closing portion C2 being seated on the valve seat 56c in a state where the passage 56b is closed by the first closing portion C1 being seated on the valve seat 56c. Can do. Therefore, even if the valve body 57 is inclined and the second closing portion C2 comes into contact with the valve seat 56c, the passage 56b can be closed by the first closing portion C1 being seated on the valve seat 56c. For this reason, the movement of the valve element 57 can be reliably stopped while suppressing leakage of combustion gas from the passage 56b.

  In the fluid pressure responsive valve 50 of the present embodiment, the valve element 57 is configured to be in an open state and a closed state. For this reason, combustion gas can be flowed by opening the passage 56b in the valve open state, and combustion gas can be stopped by closing the passage 56b in the valve closed state.

  In the fluid pressure responsive valve 50 of the present embodiment, the first and second closing portions C1 and C2 are configured in an annular shape, and the first closing portion C1 is the inner peripheral side of the second closing portion C2. Is arranged. Thereby, in addition to the 1st closing part C1, it can control that combustion gas leaks from passage 56b also by the 2nd closing part C2.

  In the fluid pressure responsive valve 50 of the present embodiment, the first closing portion C1 is configured to be able to bend and deform in the radial direction of the valve rod 55 by the movement of the valve rod 55 in the axial direction. The portion C2 is configured to be compressible and deformable in the axial direction of the valve rod 55 by the movement of the valve rod 55 in the axial direction. For this reason, even if the valve body 57 moves in the axial direction of the valve rod 55 after the first closing portion C1 is seated on the valve seat 56c, the first closing portion C1 maintains the state of being seated on the valve seat 56c. be able to. Further, the second closing portion C2 can firmly contact the valve seat 56c.

  In the fluid pressure responsive valve 50 of the present embodiment, the movement detection device 58 is configured to detect the movement of the valve rod 55 in the axial direction by turning on and off the microswitch. Thereby, the movement of the valve rod 55 in the axial direction can be reliably detected.

  The fluid pressure responsive valve 50 of the present embodiment further includes an inclination preventing rod 60 that is connected to the valve body 57 from the opposite side of the valve rod 55 with respect to the valve body 57 and is movable in the axial direction of the valve rod 55. ing. Thereby, the inclination of the valve body 57 can be suppressed.

  According to the combustion apparatus of the present embodiment, the timing of closing the passage 56b of the fluid pressure responsive valve 50 and the timing of detecting the flame of the hot water supply side burner 21 by the hot water supply side frame rod 22 can be accurately matched. Thereby, it can suppress that the combustion state of the hot water supply side burner 21 is detected accidentally.

  In the above description, the first fluid is water and the second fluid is combustion gas. However, the present invention is not limited to this, and the second fluid may be fuel oil.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Combustion device, 2 housings, 3 hot water supply side heat exchanger, 4 bath side heat exchanger, 5 type fire holding part, 6 hot water supply side combustion part, 7 bath side combustion part, 8 operation part, 9 controller, 12 pilot burner, 13 Spark plug, 14 Igniter, 15 Thermocouple, 16 types of fire gas flow path, 21 Hot water supply side burner, 22 Hot water supply side frame rod, 23 Hot water supply side gas flow path, 27 Bath side burner, 28 Bath side frame rod, 29 Bath side Gas flow path, 32 cam mechanism, 33 switching valve section, 34 source gas valve, 38 bypass flow path, 40 currant, 42 bathtub, 50 fluid pressure responsive valve, 51 diaphragm case, 51a first chamber, 51b second chamber , 52 First shaft body, 53 Diaphragm, 54 Second shaft body, 55 Valve rod, 55a Shaft body portion, 55b Extension portion, 56 Valve body, 5 a flow path, 56b passage, 56c valve seat, 57 valve body, 57a valve body main body part, 57b valve body contact part, 58 movement detection device, 59 holding member, 60 tilt prevention rod, 61 rod support member, 62, 63 , 65 Spring, 64 Bearing member, 66, 67, 68 Seal member, C1 first closing portion, C2 second closing portion.

Claims (8)

First and second chambers for separately circulating the first fluid;
A diaphragm that partitions the first and second chambers and is deformable by a pressure difference between the first fluids flowing through the first and second chambers;
A valve rod having one end and the other end, connected to the diaphragm on the one end side, and movable in the axial direction by deformation of the diaphragm;
A valve body having a flow path for circulating the second fluid, a passage leading to the flow path, and a valve seat provided around the passage;
A valve element that is disposed on the other end side of the valve rod in the flow path and can open and close the passage by being attached to and detached from the valve seat by movement of the valve rod;
A movement detecting device connected to the valve rod for detecting movement in the axial direction of the valve rod;
The valve body includes first and second closing portions each formed in a convex shape,
The first closing part is configured to protrude to the valve seat side from the second closing part,
Both the first and second closing portions are configured to be seated on the valve seat,
The movement detection device is a fluid pressure responsive valve configured to detect an axial movement of the valve rod when the first closing portion is seated on the valve seat.   The second closing portion is configured to be seated on the valve seat by moving the valve body further to the valve seat side in a state where the first closing portion is seated on the valve seat. The fluid pressure responsive valve according to claim 1. The valve body is
A valve open state in which neither of the first and second closing portions is seated on the valve seat;
3. The device according to claim 1, wherein only the first closing portion and any one of the first and second closing portions are configured to be in a closed state in which they are seated on the valve seat. Fluid pressure responsive valve.   The said 1st and 2nd closing part is comprised cyclically | annularly, The said 1st closing part is arrange | positioned in the inner peripheral side of the said 2nd closing part, The any one of Claims 1-3 The fluid pressure responsive valve according to item. The first closing portion is configured to be able to bend and deform in the radial direction of the valve rod by movement in the axial direction of the valve rod,
The fluid pressure responsive valve according to any one of claims 1 to 4, wherein the second closing portion is configured to be compressible and deformable in an axial direction of the valve rod by movement of the valve rod in an axial direction. .   The fluid pressure responsive valve according to any one of claims 1 to 5, wherein the movement detection device is configured to detect movement of the valve rod in an axial direction by turning on and off a micro switch.   The inclination prevention rod further connected to the said valve body from the opposite side to the said valve rod with respect to the said valve body, and further movable to the axial direction of the said valve rod was further provided in any one of Claims 1-6. Fluid pressure responsive valve. The fluid pressure responsive valve according to any one of claims 1 to 7,
The first fluid is water and the second fluid is a combustion gas;
A heat exchanger capable of circulating the water supplied from the fluid pressure responsive valve;
A burner for burning the combustion gas supplied from the fluid pressure responsive valve to heat the water flowing through the heat exchanger;
A frame rod capable of detecting the flame of the burner,
The combustion apparatus, wherein the frame rod is configured to detect a flame of the burner when the movement detection device detects an axial movement of the valve rod.

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