JP3765917B2 - Water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water heater.
[0002]
[Prior art]
Conventionally, a water heater, a hot water supply passage to which hot water heated by the water heater is supplied, and a hot water supply passage on the downstream side of the water heater are closed in response to hot water higher than a predetermined temperature, There is known a water heater comprising a hot water or a heat sensitive valve that opens in response to water having a temperature lower than a predetermined temperature (see, for example, Japanese Patent No. 2507244). This predetermined temperature is set to a temperature that causes discomfort to the user when hot water having a temperature higher than that is supplied.
[0003]
In this hot water heater, hot water having a temperature higher than a predetermined temperature may be generated in the hot water supply path because of an erroneous operation by the user or because of so-called post-boiling where water is overheated due to residual heat of the water heater after hot water is stopped. . In this case, since the heat sensitive valve is closed in response to hot water having a temperature higher than a predetermined temperature and hot water supply is stopped, the user can use the water heater without feeling uncomfortable.
[0004]
In the water heater, the supply of hot water having a temperature higher than a predetermined temperature is stopped, but the hot water or water having a low temperature is supplied to the user as it is. Accordingly, there is a disadvantage that it is impossible to prevent the user from being supplied with water that is lower than the predetermined temperature and is cold enough to cause discomfort to the user.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a water heater that eliminates the inconvenience and can supply only hot water or water that does not cause discomfort to the user.
[0006]
[Means for Solving the Problems]
The water heater of the present invention for solving the above problems is a water heater having a water heater and a hot water supply passage for supplying hot water heated by the water heater, wherein the water temperature of the hot water supply passage is a first predetermined temperature. When the temperature is higher, the valve is closed. When the water temperature is lower than the second predetermined temperature lower than the first predetermined temperature, the valve is closed. When the water temperature is higher, the valve is closed. A second heat sensitive valve to be valved is provided in the hot water supply path downstream from the water heater, and when the first heat sensitive valve is closed, hot water or When water is discharged and the first heat sensitive valve is opened, first discharge means for stopping the discharge of hot water or water from the hot water supply passage; and when the second heat sensitive valve is closed, its closed position When hot water or water is discharged from the hot water supply channel on the upstream side, and the second heat sensitive valve opens It is at least any one of the second discharge means to stop the discharge of hot water or water from fed-water passage, characterized in that provided in the hot water supply passage downstream of the water heater.
[0007]
The first predetermined temperature is set to a temperature that may cause discomfort to the user when hot water having a temperature higher than that is supplied. The second predetermined temperature is set to a temperature that may cause discomfort to the user when lower temperature water is supplied.
[0008]
When the water heater does not operate as expected due to an erroneous operation by the user and hot water higher than the first predetermined temperature flows into the hot water supply path, the first heat-sensitive valve is closed in response to this. The hot water supply path is shut off and the hot water supply is stopped. For the same reason, when water having a temperature lower than the second predetermined temperature flows into the hot water supply passage, the second heat-sensitive valve is closed in response to this, and the hot water supply passage is shut off, and the water supply is stopped. Accordingly, hot water higher than the first predetermined temperature and water lower than the second predetermined temperature are not supplied, and the user can use the water heater without feeling uncomfortable.
[0009]
When a user who has noticed his / her erroneous operation due to the stoppage of hot water supply / water supply, etc. restarts operation, hot water or water having a temperature lower than the first predetermined temperature and higher than the second predetermined temperature can flow into the hot water supply channel. . However, as long as the temperature of hot water higher than the first predetermined temperature or water lower than the second predetermined temperature remaining in the hot water supply passage does not change from lower than the first predetermined temperature to higher than the second predetermined temperature, the first and Any one of the second heat-sensitive valves remains closed.
[0011]
By providing the first discharge means, hot water having a temperature higher than the first predetermined temperature upstream of the closed first heat sensitive valve is discharged. By providing the second discharge means, water having a temperature lower than the second predetermined temperature upstream of the closed second heat sensitive valve is discharged. For this reason, it becomes possible for hot water or water having a temperature lower than the first predetermined temperature and higher than the second predetermined temperature to flow into the hot water supply passage without taking time. Therefore, the time required from hot water supply / water supply stop to restart is shortened, and the user can comfortably use the water heater.
[0012]
Further, it is preferable that the first discharge means is provided in the vicinity of the first heat sensitive valve and the second discharge means is provided in the hot water supply path in the vicinity of the second heat sensitive valve. Thereby, when one of the first and second heat sensitive valves is closed, hot water or water having a temperature lower than the first predetermined temperature and higher than the second predetermined temperature can flow to the valve closing position. Thereby, the first and second heat sensitive valves can be opened more quickly. Therefore, the time required to stop or restart hot water supply / water supply is more reliably reduced, and the user can use the water heater more comfortably.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, a water heater according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a configuration diagram of a water heater according to the present invention, and FIGS. 2 to 5 are explanatory sectional views of a heat sensitive valve and a discharge valve in the water heater according to the present invention. In the water heater shown in FIG. 1, 1 is hot water or a hot water passage through which water passes, 2 is a heat exchanger that is heated by the burner 3 to raise the temperature of water passing through the hot water passage 1, and 4 is for supplying gas to the burner 3. This is a gas supply path.
[0014]
The hot water supply path 1 is provided with a water pressure passive unit 5 and a water amount adjustment valve 6 on the upstream side of the heat exchanger 2, and a hot water tap 7, a first heat sensitive valve 8 and a second heat sensitive valve 9 are provided on the downstream side. It has been. A first discharge path 12 branched from the hot water supply path 1 and opened / closed by the first discharge valve 10 is provided in the vicinity and upstream of the first heat sensitive valve 8. A second discharge path 13 branched from the hot water supply path 1 and opened and closed by the second discharge valve 11 is provided in the vicinity and upstream of the second heat sensitive valve 9. A shower head 14 for supplying hot water or water in the form of a shower to the user is provided at the end of the hot water supply path 1.
[0015]
The water pressure passive unit 5 is driven according to the water flow pressure of the hot water supply channel 1. The water flow control valve 6 controls the opening degree of the hot water supply passage 1 by operating the temperature control unit 15 to adjust the water flow rate. The hot-water tap 7 is opened and closed by operating the knob, and the hot-water supply path 1 is shut off and communicated. The first heat sensitive valve 8 is configured to close in response to hot water having a temperature higher than the first predetermined temperature, and to open in response to hot water or water having a temperature lower than the first predetermined temperature. The second heat sensitive valve 9 is configured to close in response to water having a temperature lower than the second predetermined temperature, and to open in response to water or hot water having a temperature higher than the second predetermined temperature. The first discharge valve 10 is opened when the first heat-responsive valve 8 is closed, and is closed when the first heat-responsive valve 8 is opened, thereby allowing the first discharge path 12 to communicate and block. The second discharge valve 11 is opened when the second heat-sensitive valve 9 is closed, and is closed when the second heat-responsive valve 9 is opened, thereby allowing the second discharge path 13 to communicate and block.
[0016]
A water pressure responsive valve 16, a gas amount adjusting valve 17, and a gas governor 18 are provided in the gas supply path 4. The water pressure responsive valve 16 is formed integrally with the water pressure passive portion 5 and is driven to open when the water pressure passive portion 5 is driven by the pressure of the water flowing through the hot water supply passage 1. The gas amount adjusting valve 17 controls the opening degree of the gas supply path 4 by operating the temperature control unit 15 to adjust the gas supply amount to the burner 3. The gas governor 18 makes the gas pressure of the gas supplied to the burner 3 constant.
[0017]
When the user operates the temperature control unit 15 to open the hot water supply and opens the hot water tap 7, the opening degree of the water amount adjusting valve 6 and the gas amount adjusting valve 17 is appropriately adjusted according to this and the water tap (not shown) Water is supplied from the pipe to the hot water supply path 1. The water pressure passive unit 5 is driven by the pressure of the water flow, and the water pressure responsive valve 16 is driven to open, and gas is supplied to the burner 3, and this gas is ignited by ignition means (not shown) to generate a combustion flame in the burner 3. . Water passing through the hot water supply path 1 is heated by the heat exchanger 2 heated by the combustion flame of the burner 3 and supplied through the shower head 14. When the user operates the temperature control unit 15 to start water supply, the gas amount adjusting valve 17 is closed, so that no gas is supplied to the burner 3 and no combustion flame is generated in the burner 3. Therefore, the water passing through the hot water supply path 1 is supplied through the shower head 14 without being heated by the heat exchanger 2. In the water heater of this embodiment, the heat exchanger 2 heated by the burner 3 is used as a means for heating water, but means such as an electric heater may be used.
[0018]
Hereinafter, the 1st heat sensitive valve 8, the 2nd heat sensitive valve 9, the 1st discharge valve 10, and the 2nd discharge valve 11 which are the principal parts of the water heater of this embodiment are demonstrated using FIG.2 and FIG.3. The first heat-responsive valve 8 includes a bottomed tubular valve body 19 and a substantially tubular valve body 20 that is movably inserted in the valve body 19 in the axial direction. In the valve body 19, there are provided a spring 21 for urging the valve body 20 in the right direction and a first thermal spring 22 made of a shape memory alloy and urging the valve body 20 in the left direction. It has been.
[0019]
A spring seat 23 is provided at the right end of the side wall of the valve body 19. An inlet 24 is opened in the spring seat 23. In addition, an outlet 25 and an opening 26 are formed on the side wall of the valve body 19. Further, valve seats 27 and 28 that are gradually reduced in diameter toward the bottom wall of the valve main body 19 are formed on the inner periphery of the right and left side walls from the outlet 25 of the valve main body 19. An annular pedestal 29 is formed further on the bottom wall side than the valve seat 28 of the valve body 19. O-rings 30 and 31 are attached to the outer periphery of the side wall of the valve body 20. Further, guides 32 and 33 are provided at the right end and the left end of the side wall of the valve body 20, respectively. The guides 32 and 33 are provided with flow slits 32a and 33a, respectively, so that hot water or water can pass therethrough. Further, a jaw portion 34 is formed on the inner periphery of the side wall of the valve body 20. The spring 21 is interposed between the bottom wall of the valve body 19 and the left end of the side wall of the valve body 20. The first thermal spring 22 is interposed between the spring seat 23 and the jaw portion 34 of the valve body 20. When the first thermal spring 22 is in contact with hot water having a temperature higher than the first predetermined temperature, the elastic force is increased, and when the first thermal spring 22 is in contact with hot water or water having a temperature lower than the first predetermined temperature, the elastic force is increased. It is comprised so that it may become small.
[0020]
The first discharge valve 10 includes a substantially cylindrical valve main body 35 and a substantially cylindrical pipe 36 attached to the valve main body 35. Further, a storage portion 37 formed between the valve main body 35 and the pipe 36 includes a valve body 38 that is movably inserted in the axial direction, and a spring 39 that urges the valve body 38 upward. Is provided.
[0021]
An outlet 40 is opened at the upper end of the valve body 35. An annular valve seat 41 is formed on the inner wall of the valve body 35 near the outlet 40. A screw portion 42 is formed at the inner peripheral lower portion of the side wall of the valve body 35. An O-ring 43 is attached to the outer periphery of the side wall of the pipe 36. Further, a screw portion 44 is formed on the outer peripheral upper portion of the side wall of the tube 36. The screw part 42 and the screw part 44 are screwed together, and the O-ring 43 is in sliding contact with the inner periphery of the side wall of the valve body 35, thereby connecting the valve body 35 and the pipe 36. A disc valve 45 is mounted on the valve body 38. A groove 46 is provided on the outer periphery of the side wall of the valve body 38 so that hot water or water can pass therethrough. A stopper 47 is provided at the lower end of the valve body 38. The stopper 47 is provided with a flow slit 47a so that hot water or water can pass therethrough. The spring 39 is interposed between the upper end of the side wall of the pipe 36 and the lower end of the valve body 38.
[0022]
The first heat sensitive valve 8 is provided such that the inside of the valve body 19 communicates with the upstream and downstream sides of the hot water supply passage 1 through the inlet 24 and the outlet 25, respectively. The first discharge valve 10 is provided so that the inside of the valve main body 35 communicates with the upstream of the hot water supply path 1 and the first discharge path 12 through the outlet 40 and the pipe 36.
[0023]
When hot water having a temperature higher than the first predetermined temperature flows from the upstream side of the hot water supply passage 1 and contacts the first thermal spring 22, the elastic force of the first thermal spring 22 is greater than the elastic force of the spring 21 of the first thermal valve 8. Is also large enough. At this time, in the first heat sensitive valve 8, the valve body 20 is driven leftward as shown in FIG. 2, and the O-rings 30 and 31 are brought into sliding contact with the valve seats 27 and 28, respectively, thereby closing the outlet 25. Further, the stopper 33 abuts on the annular pedestal 29 to restrict the movement of the valve body 20 in the left direction, and the O-rings 30 and 31 are prevented from being damaged by being pressed against the valve seats 27 and 28 with excessive force. To do.
[0024]
When the outlet 25 is closed and the hot water supply path 1 is shut off, the water pressure on the upstream side of the hot water supply path 1 is increased, and the pressure applied to the disc valve 45 of the first discharge valve 10 is increased. When this pressure becomes sufficiently larger than the elastic force of the spring 39, the valve body 38 is driven downward as shown in FIG. 2, and the outlet 40 is opened when the disc valve 45 is separated from the annular valve seat 41. The stopper 47 comes into contact with the upper end of the side wall of the pipe 36 and the downward movement of the valve body 38 is restricted. Accordingly, hot water having a temperature higher than the first predetermined temperature passes through the outlet 40 as indicated by an arrow and flows into the discharge path 12.
[0025]
When hot water or water having a temperature lower than the first predetermined temperature flows from the upstream side of the hot water supply channel 1 and contacts the first thermal spring 22, the elastic force of the first thermal spring 22 is the elasticity of the spring 21 of the first thermal valve 8. It is much smaller than force. At this time, in the first heat-responsive valve 8, the valve body 20 is driven rightward as shown in FIG. 3, and the O-rings 30 and 31 are separated from the valve seats 27 and 28, respectively, thereby opening the outlet 25. Further, the stopper 32 abuts against the spring seat 23 and the movement of the valve body 20 in the right direction is restricted.
[0026]
When the outlet 25 is opened and the hot water supply passage 1 is communicated, the water pressure on the upstream side of the hot water supply passage 1 decreases, and the pressure applied to the disc valve 45 of the first discharge valve 10 decreases. When this pressure becomes sufficiently smaller than the elastic force of the spring 39 in the first discharge valve 10, the valve body 38 is driven upward as shown in FIG. 3, and the disc valve 45 comes into contact with the annular valve seat 41, thereby causing the outlet 40. Is closed. Accordingly, hot water or water having a temperature lower than the first predetermined temperature passes through the outlet 25 as indicated by an arrow and flows downstream of the hot water supply path 1.
[0027]
The second heat sensitive valve 9 has the same basic structure as the first heat sensitive valve 8. The second discharge valve 11 has the same structure as the first discharge valve 10. In FIG. 2 and FIG. 3, these same structures will be described using the same reference numerals, and different structures will be described using parenthesized reference numerals. The second heat-sensitive valve 9 is different from the first heat-sensitive valve 8 in that the spring 21 and the first heat-sensitive spring 22 are replaced with a second heat-sensitive spring 48 and a spring 49.
[0028]
When the second thermal spring 48 is in contact with water having a temperature lower than the second predetermined temperature, the elastic force thereof is sufficiently smaller than the elastic force of the spring 49, and contacts the water or hot water having a temperature higher than the second predetermined temperature. The elastic force is configured to be sufficiently larger than the elastic force of the spring 49. Therefore, for water having a temperature lower than the second predetermined temperature, the second heat-responsive valve 9 is closed and the second discharge valve 11 is opened as shown in FIG. Further, for water or hot water having a temperature higher than the second predetermined temperature, the second heat-responsive valve 9 is opened and the second discharge valve 11 is closed as shown in FIG.
[0029]
According to the water heater of the present embodiment, the first heat sensitive valve 8 is closed in response to hot water having a temperature higher than the first predetermined temperature, and the second heat sensitive valve is responding to water having a temperature lower than the second predetermined temperature. 9 closes and stops hot water supply and water supply. Accordingly, hot water higher than the first predetermined temperature and water lower than the second predetermined temperature are not supplied, and the user can use the water heater without feeling uncomfortable. Further, hot water having a temperature higher than the first predetermined temperature is discharged to the first discharge path 12 by the first discharge valve 10, and water having a temperature lower than the second predetermined temperature is discharged to the second discharge path 13 by the second discharge valve 11. Due to this discharge, hot water or water having a temperature lower than the first predetermined temperature and higher than the second predetermined temperature flows to the first heat-sensitive valve 8 and the second heat-sensitive valve 9 without taking any time even if the hot water supply / water supply is stopped. It becomes possible. Accordingly, the time required from when hot water supply / water supply is stopped to when it is restarted is short, and the user can use the water heater more comfortably.
[0030]
Other structural examples of the first heat sensitive valve 8, the second heat sensitive valve 9, the first discharge valve 10, and the second discharge valve 11 in the water heater of this embodiment will be described with reference to FIGS. A driving body 50 is provided between the first heat sensitive valve 8 and the first discharge valve 10. Both valves are driven via the driver 50.
[0031]
The first heat-responsive valve 8 includes a substantially cylindrical valve body 52 that is movably inserted in the axial direction inside a bottomed cylindrical valve body 51. A spring 53 that urges the valve body 52 upward and a first thermal spring 54 that is made of a shape memory alloy and urges the valve body 52 downward are provided in the valve body 51. Yes.
[0032]
A stopper 55 is provided at the upper end of the side wall of the valve body 51. An outlet 56 is formed in the side wall of the valve body 51. Furthermore, valve seats 57 and 58 having diameters gradually reduced toward the bottom wall of the valve body 51 are formed on the inner periphery of the side wall above and below the outlet 56 of the valve body 51. An annular pedestal 59 is formed further on the bottom wall side than the valve seat 58 of the valve body 51. O-rings 60 and 61 are attached to the outer periphery of the side wall of the valve body 52. Further, guides 62 and 63 are provided at the upper and lower ends of the side wall of the valve body 52, respectively. The guides 62 and 63 are respectively provided with flow slits 62a and 63a so that hot water or water can pass therethrough. Further, a jaw 64 is formed on the inner periphery of the side wall of the valve body 52. The spring 53 is interposed between the bottom wall of the valve body 51 and the lower end of the side wall of the valve body 52. The first thermal spring 54 has a large elastic force when in contact with hot water having a temperature higher than the first predetermined temperature, and the elastic force is in contact with hot water or water having a temperature lower than the first predetermined temperature. It is comprised so that it may become small.
[0033]
The first discharge valve 10 includes a substantially cylindrical valve main body 65 and a substantially cylindrical pipe 66 attached to the valve main body 65. In addition, a storage portion 67 formed between the valve main body 65 and the pipe 66 includes a valve body 68 that is movably inserted in the axial direction, and a spring 69 that biases the valve body 68 downward. Is provided.
[0034]
An outlet 70 is formed in the lower end wall of the valve body 65. An annular valve seat 71 is formed inside the lower end wall near the outlet 70 of the valve body 65. A screw part 72 is formed on the inner peripheral upper part of the side wall of the valve main body 65. An O-ring 73 is attached to the outer periphery of the side wall of the tube 66. Further, a threaded portion 74 is formed in the lower portion of the outer periphery of the side wall of the tube 66. The threaded portion 72 and the threaded portion 74 are screwed together, and the O-ring 73 is in sliding contact with the inner periphery of the side wall of the valve body 65, thereby connecting the valve body 65 and the pipe 66. A disc valve 75 is attached to the valve body 68. A groove 76 is provided on the outer periphery of the side wall of the valve body 68 so that hot water or water can pass therethrough. A stopper 77 is provided at the upper end of the valve body 68. The stopper 77 is provided with a flow slit 77a so that hot water or water can pass therethrough. The spring 69 is interposed between the lower end of the side wall of the tube 66 and the upper end of the valve body 68.
[0035]
The driving body 50 is formed integrally with a base, an upper edge flange on the base, and a rod protruding from the upper surface of the base. The upper end of the rod is in contact with the lower end of the disc valve 75. The lower end of the flange contacts the upper end of the first thermal spring 54, and a stopper 78 is provided on the upper end of the base. The stopper 78 is provided with a flow slit 78a so that hot water or water can pass through the stopper 78.
[0036]
The first heat sensitive valve 8 is provided so that the inside of the valve body 51 communicates with the upstream and downstream sides of the hot water supply passage 1 through the upper end opening and the outlet 56, respectively. The first discharge valve 10 is provided so that the inside of the valve main body 65 communicates with the upstream of the hot water supply path 1 and the first discharge path 12 through the outlet 70 and the pipe 66.
[0037]
When hot water having a temperature higher than the first predetermined temperature flows, the elastic force of the first thermal spring 54 is sufficiently larger than the elastic force of the spring 53 of the first thermal valve 8. At this time, in the first heat sensitive valve 8, as shown in FIG. 4, the valve body 52 is driven downward, and the O-rings 60 and 61 are brought into sliding contact with the valve seats 57 and 58, respectively, thereby closing the outflow port 56. It is done. The guide 63 abuts on the annular pedestal 59 and the downward movement of the valve body 52 is restricted, and the O-rings 60 and 61 are prevented from being damaged by being pressed against the valve seats 57 and 58 with excessive force.
[0038]
At the same time, the elastic force of the first thermal spring 54 is sufficiently larger than the elastic force of the spring 69 of the first discharge valve 10. As a result, in the second heat-responsive valve 9, the valve body 68 is driven upward as shown in FIG. 4, and the outlet 70 is opened when the disc valve 75 is separated from the annular valve seat 71. Further, the stopper 77 abuts against the lower end of the side wall of the pipe 66, and the upward movement of the valve body 68 is restricted. The stopper 78 abuts against the lower end wall of the valve main body 65 to restrict the upward movement of the driving body 50, thereby preventing the disk valve 75 from being pressed and damaged by the rod of the driving body 50 with an excessive force. Since the outlet 56 is closed and the outlet 70 is opened as described above, hot water having a temperature higher than the first predetermined temperature passes through the outlet 70 as indicated by an arrow and flows to the first outlet 12.
[0039]
When hot water or water having a temperature lower than the first predetermined temperature flows, the elastic force of the first heat-sensitive spring 54 becomes sufficiently smaller than the elastic force of the spring 53 of the first heat-responsive valve 8. As a result, the valve body 52 is driven upward as shown in FIG. 5, and the O-rings 60 and 61 are separated from the valve seats 57 and 58, respectively, thereby opening the outflow port 56. The guide 62 abuts against the stopper 55 and the upward movement of the valve body 52 is restricted.
[0040]
At the same time, the elastic force of the first thermal spring 54 is sufficiently smaller than the elastic force of the spring 69 of the first discharge valve 10. Therefore, as shown in FIG. 5, the valve body 68 is driven downward, and the outlet 70 is closed when the disc valve 75 contacts the annular valve seat 71. Since the outlet 70 is closed and the outlet 56 is opened as described above, hot water or water having a temperature lower than the first predetermined temperature passes through the outlet 56 as indicated by an arrow and flows downstream of the hot water supply channel 1.
[0041]
The second heat sensitive valve 9 has the same basic structure as the first discharge valve 10. The basic structure of the second discharge valve 11 is the same as that of the first heat-responsive valve 8. 4 and 5, these same structures will be described using the same reference numerals, and different structures will be described using parenthesized reference numerals. The second heat sensitive valve 9 is different from the first discharge valve 10 in that the spring 69 is replaced with a spring 79. The second discharge valve 11 is different from the first thermoresponsive valve 8 in that the spring 53 is replaced with a spring 80. The second heat sensitive valve 9 and the second discharge valve 11 are also opened and closed by a second heat sensitive spring 81 interposed between the two valves.
[0042]
The second thermal spring 81 is configured such that its elastic force is smaller than the elastic force of the spring 79 and the elastic force of the spring 80 when it is in contact with water having a temperature lower than the second predetermined temperature. The second thermal spring 81 is configured such that the elastic force thereof is greater than the elastic force of the spring 79 and the elastic force of the spring 80 when in contact with water or hot water having a temperature higher than the second predetermined temperature. . Therefore, for water having a temperature lower than the second predetermined temperature, the second heat-responsive valve 9 is closed and the second discharge valve 11 is opened as shown in FIG. For water or hot water having a temperature higher than the second predetermined temperature, the second heat-responsive valve 9 is opened and the second discharge valve 11 is closed as shown in FIG.
[0043]
The effects as described above can also be obtained when the first heat sensitive valve 8, the second heat sensitive valve 9, the first discharge valve 10 and the second discharge valve 11 of this configuration example are used. That is, hot water higher than the first predetermined temperature and water lower than the second predetermined temperature are not supplied, and the user can use the water heater without feeling uncomfortable. In addition, the time required from when hot water supply / water supply is stopped to when it is restarted is short, and the user can use the water heater more comfortably.
[0044]
One of the first discharge valve 10 and the second discharge valve 11 may be opened and closed according to the water pressure, and the other may be opened and closed according to the water temperature. That is, the first discharge valve 10 opens and closes depending on whether the water temperature in the hot water supply passage 1 is higher or lower than the first predetermined temperature, and the second discharge valve 11 causes the water pressure in the hot water supply passage 1 to be higher than the predetermined pressure. You may make it open and close according to whether it is low. Alternatively, the first discharge valve 10 opens and closes depending on whether the water pressure in the hot water supply passage 1 is higher or lower than a predetermined pressure, and the second discharge valve 11 causes the water temperature in the hot water supply passage 1 to be lower than the second predetermined temperature. The valve may be opened or closed depending on whether it is high. Even with the water heater having such a configuration, when the first heat sensitive valve is closed, hot water having a temperature higher than the first predetermined temperature is discharged from the hot water supply passage 1, and when the second heat sensitive valve is closed, the second predetermined temperature is discharged. Lower temperature water can be discharged from the hot water supply channel 1. Accordingly, the time required from when hot water supply / water supply is stopped to when it is restarted is short, and the user can use the water heater more comfortably.
[0045]
Any one of the first discharge valve 10 and the first discharge path 12 or the second discharge valve 11 and the second discharge path 13 may be omitted. In this case, although it may take some time to resume hot water supply / water supply, hot water higher than the first predetermined temperature and lower temperature than the second predetermined temperature by the first heat sensitive valve 8 and the second heat sensitive valve 9 may occur. Therefore, the user can use the water heater without feeling uncomfortable.
[Brief description of the drawings]
FIG. 1 is a block diagram of a water heater according to the present invention. FIG. 2 is an explanatory cross-sectional view of a heat sensitive valve and a discharge valve in the water heater according to the present invention. Explanatory cross-sectional view [FIG. 4] Explanatory cross-sectional view of the heat-sensitive responsive valve and the discharge valve in the water heater of the present invention. [FIG. ]
DESCRIPTION OF SYMBOLS 1 ... Hot water supply path, 2 ... Heat exchanger (water heater), 8 ... 1st heat sensitive valve, 9 ... 2nd heat sensitive valve, 10 ... 1st discharge valve (1st discharge means), 11 ... 2nd discharge Valve (second discharge means), 12... First discharge path (first discharge means), 13... Second discharge path (second discharge means)

Claims (2)

In a water heater having a water heater and a hot water supply passage for supplying hot water heated by the water heater, the water heater is closed when the water temperature of the hot water passage is higher than a first predetermined temperature, and is opened when the water temperature is lower. The water heater includes a first heat-sensitive valve and a second heat-sensitive valve that closes when the water temperature of the hot water supply passage is lower than a second predetermined temperature lower than the first predetermined temperature and opens when the water temperature is higher than the first predetermined temperature. Provided in the hot water supply path on the downstream side,
When the first heat sensitive valve is closed, hot water or water is discharged from the hot water supply passage upstream from the valve closing position, and when the first heat sensitive valve is opened, the hot water or water from the hot water supply passage is opened. When the first discharge means for stopping the discharge of the water and the second heat sensitive valve are closed, hot water or water is discharged from the hot water supply passage on the upstream side when viewed from the closed position, and the second heat sensitive valve is opened. In this case, at least one of hot water or second discharge means for stopping discharge of water from the hot water supply path is provided in the hot water supply path downstream of the water heater. Provided with the first discharge means in the vicinity of the first heat-sensitive responsive valve, water heater according to claim 1, wherein providing the second discharge means to the hot water supply passage in the vicinity of the second heat-sensitive responsive valve.

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