JPH0435712Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hot water outlet temperature regulating device for a gas water heater that maintains the outlet temperature at a predetermined value even if the water flow rate is increased or decreased.

[Prior Art] There are various types of conventional hot water temperature control devices of this type, but for example, in the technology of Japanese Patent Application No. 59-193052 related to the applicant's earlier application, the opening degree of the gas valve is adjusted. A bench lily that applies pressure according to the amount of water flowing to a diaphragm device that increases or decreases depending on the amount of water flowing,
It consists of a pipe section with a smoothly constricted inner surface in the middle part, and a tapered valve section that is inserted into this pipe section and moves in the longitudinal direction to increase or decrease the passage area between the pipe section and the valve section. At least one of them is manually moved along the longitudinal direction. According to such technology, when the tap water temperature is set to a high temperature, the range of increase or decrease in the amount of water supplied is smaller than when it is set to a low temperature, and therefore, the operating characteristics can be adjusted to the required characteristics in both high temperature tap water and low temperature tap water taps. It is possible to keep the temperature close to the water supply, supply an appropriate amount of gas in response to changes in the amount of water supplied, and stabilize the hot water temperature over almost the entire range of the amount of water supplied.

[Problems to be solved by the invention] However, in the above-mentioned conventional technology, the passage area between the pipe section and the valve section is manually increased or decreased. There was also the problem of temperature changes. This invention uses a diaphragm that responds to water flow rate to control the opening of the gas valve to maintain the outlet temperature at a predetermined value. The above-mentioned problem is solved by providing a temperature-sensitive member that expands and contracts, and changing the passage area between the pipe portion and the valve portion of the bench lily using the temperature-sensitive member.

[Means for Solving the Problems] Therefore, in the hot water outlet temperature control device for a gas water heater according to the present invention, as illustrated in the attached drawing, the inside of the diaphragm chamber 10 is partitioned by a diaphragm 11 to separate the primary chamber 10a and the Forming a secondary chamber 10b, 1
The negative pressure generating part of the bench lily 20 provided in the water supply channel 12 passing through the next chamber 10a is communicated with the secondary chamber 10b, and as the amount of water flowing increases, the diaphragm 11 is deflected, and this deflection changes the opening of the gas valve 15. In a gas water heater that continuously increases the temperature and controls the amount of gas supplied to the burner to maintain the outlet temperature at a predetermined value,
The bench lily 20 has a pipe section 21 whose middle inner surface is smoothly constricted, and is inserted into this pipe section and connected to the diaphragm 11 via a support rod 23, so that it automatically moves along the water supply channel as the amount of water flowing increases. It has a tapered valve part 22 that moves to increase the passage area between it and the pipe part 21, and further has an actuator 30a that is installed in the water supply channel 12 and expands and contracts according to changes in the water temperature. a temperature sensing member 30 that moves the pipe section 21 connected to the actuator along the longitudinal direction of the water supply channel 12 to increase the passage area between the pipe section and the valve section 22 in response to a rise in the temperature of the water supply; It is characterized by having the following.

[Function] Regardless of whether the water supply temperature is low or high, as the amount of water supply increases, the negative pressure generated in the negative pressure generating part of the bench lily 20 increases, and the action of this negative pressure applied to the diaphragm 11 causes the opening degree of the gas valve 15 to increase. At the same time as the amount of water increases, the valve part 22 also moves, and the passage area between it and the pipe part 21 increases to alleviate the increase in negative pressure, so the slope of the characteristic curve of the opening degree of the gas valve 15 with respect to the amount of water flow becomes small. . However, since the passage area between the pipe section 21 and the valve section 22 when the supply water temperature is low is smaller than when the supply water temperature is high, the slope of the characteristic curve is larger when the supply water temperature is low, and Therefore, the amount of water supplied over the entire range of the opening degree of the gas valve 15 becomes smaller as a whole and the range of increase/decrease becomes smaller when the temperature of the supplied water is low.

If the water supply temperature is low, the temperature sensing member 30 provided in the water supply channel 12 is contracted, and the pipe portion 21 constituting the bench lily 20 is moved along the longitudinal direction,
Bench lily 2 because it reduces the passage area between them.
The negative pressure generated in the negative pressure generating section 2 becomes large in relation to the amount of water flowing, and the deflection of the diaphragm 11 becomes large, increasing the opening degree of the gas valve 15. This increases the amount of gas supplied to the burner, increasing the temperature difference between the water supply temperature and the hot water outlet temperature, thereby compensating for the drop in the water supply temperature and providing hot water at a predetermined temperature. When the water supply temperature rises, the temperature sensing member expands, and due to the opposite effect to the above, the negative pressure generated in the negative pressure generating portion of the bench lily 22 becomes small compared to the amount of water flowing, and the opening degree of the gas valve 15 is reduced. As a result, the amount of gas supplied to the burner is reduced, so that the outlet temperature is maintained at a predetermined temperature despite the rise in the water supply temperature.

[Effects of the Invention] As described above, according to the present invention, the hot water temperature is automatically maintained at a predetermined temperature even if the water supply temperature changes, so hot water at a predetermined temperature can be obtained throughout the year. Furthermore, since the range of increase/decrease in the amount of water supplied is smaller when the water supply temperature is low, the hot water temperature can be maintained at a stable predetermined value even if the amount of hot water dispensed is increased or decreased regardless of the height of the water supply temperature. Moreover, since the adjustment member necessary for this purpose is also used as a tube part that is a part of the component of the bench lily, and this is moved by a temperature-sensitive member, the number of parts is reduced, the structure is simplified, and the manufacturing cost is reduced. The increase is also small.

[Embodiment] FIGS. 1 and 2 show an embodiment of the present invention, in which a diaphragm chamber 10 formed between a housing 1 and a cover 2 screwed thereto is partitioned by a diaphragm 11 to form a primary chamber. 10a and secondary room 1
0b and passed through the primary chamber 10a.
A bench lily 20 is provided in the second downstream passage 12a.
The gas supply path 13 to the burner (not shown) is provided with a gas valve 15 in which a valve body 15a is urged against a valve seat 15b by a spring 15c, and a diaphragm 11
The valve body 15a lifts in response to the deflection of the gas valve 1.
The diaphragm 11 and the valve body 15a are connected by rods 14 and 14a so that the valve 5 is opened.

The bench lily 20 consists of a pipe part 21 and a valve part 22. The pipe part 21 of the bench lily 20 has a smoothly constricted inner surface at the center, and is slidable in the longitudinal direction on the inner surface of the downstream passage 12a of the water supply channel 12 via a seal ring 25. Enables mating support. The pipe part 21 is slidable for a predetermined length through a bridge member 26 provided across the downstream passage 12a through a pair of vertically elongated guide holes 21c provided on the side faces of the pipe part 21c facing each other. Both sides of the connecting member 27 are released, and the tip of the adjusting rod 28 fixed to the connecting member 27 protrudes liquid-tightly and slidably from the first guide plug 5 provided in the casing 1 to connect to the temperature-sensitive member described later. 30, the longitudinal position can be adjusted. Pipe part 21
is biased by a spring 29 interposed between the first guide plug 5 and the connecting member 27 in a direction in which the passage area between the first guide plug 5 and the valve portion 22 becomes smaller. Valve part 22 inserted into pipe part 21 with the tapered tip facing downstream
is pressed and supported by a support rod 23 fixed to the boss portion 11a at the center of the diaphragm 11 via a spring 24, and as the amount of water flowing through the diaphragm 1 increases, the diaphragm 1
1 causes the valve part 22 to retreat, thereby increasing the passage area between the valve part 22 and the pipe part 21. For this purpose, the negative pressure generating part of the bench lily 20 and the diaphragm chamber 10
A communication hole 21a and an annular groove 21 are provided between the secondary chamber 10b.
b, and communicate through a communication path 16.

The water supply channel 12 located upstream from the primary chamber 10a of the diaphragm device is connected to a water inlet pipe 3 attached to the casing 1, as shown in FIGS. 1 and 2.
It is mainly formed by a water governor chamber 50 and a communication hole 50a that communicate the water inlet pipe 3 and the primary chamber 10a, and further consists of a sensitive chamber 31 that communicates with the water governor chamber 50, a valve chamber 41, and an opening 44. Equipped with a bypass path. A governor valve body 52 is slidably inserted into the water governor chamber 50, and is biased by springs 53, 53a to alleviate fluctuations in water flow rate when the water pressure supplied to the water supply channel 12 fluctuates. The bypass passage is provided to bypass the governor valve body 52.

As shown in FIG.
A temperature sensing member 30 having a temperature of
The actuator 30a is supported in a liquid-tight manner and projects out of the sensitive chamber 31 parallel to the tip of the adjustment rod 28. In this embodiment, the temperature sensing member 30 has a built-in wax that expands and contracts due to temperature changes, thereby expanding and contracting the actuator 30a relative to the main body.

A water control valve 40 is provided in the bypass passage. That is, a control rod 43 is liquid-tightly and slidably supported in the second guide plug 7 provided at the opening of the valve chamber 41 in parallel with the adjustment rod 28 and the actuator 30a, and is fixed to the tip thereof. The valve body 42 forms a variable throttle 46 between the valve chamber 41 and an opening that communicates with the water governor chamber 50 . A spring 45 is provided between a spring receiver provided on the outside of the control rod 43 and the casing 1, which urges the control rod 43 outward, that is, in a direction that increases the variable aperture 46. The water control valve 40 is made up of the above-mentioned members.

A support plate 4 that pivotally supports the base end of the lever 32 via a pivot pin 33 is fixed to one side of the casing 1 from which the adjustment rod 28, actuator 30a, and control rod 43 protrude. The tip is connected to the middle part of the lever 32 via a connecting pin 34, and two nuts 3 are attached to the tip of the lever 32.
2a and 32b are caulked and fixed. Lever 3
2 is a spring 29 that biases the tube portion 21;
The nuts 32a, 32b are always biased counterclockwise in FIG. 1 with the pivot pin 33 as the center.
The tips of the first and second adjusting screws 35 and 36 screwed into the actuator 30a of the temperature sensing member 30 are always
and is in contact with the outside of the control rod 43 of the water control valve 40. The tip of the support plate 4 is bent to form a guide portion 4a, which engages and guides the recess 32c at the tip of the lever 32.

Next, the operation of this embodiment will be explained. Water supply channel 1
When a hot water tap (not shown) provided on the upstream or downstream side of the bench lily 20 is opened, the negative pressure generated in the negative pressure generating section of the bench lily 20 due to the water supply passing through the water supply channel 12 is transferred to the communication hole 21a, the annular groove 21b, and the communication hole 21a. 2 via passage 16
The pressure is transmitted to the next chamber 10b, creating a pressure difference between it and the primary chamber 10a, and the diaphragm 1 responds to this pressure difference.
1 to the secondary chamber 10b side, and the rods 14a,
14 to open the gas valve 15 to open the gas supply path 13.
A heat exchanger (not shown) that supplies gas to a burner (not shown) and is provided on the downstream side of the water supply channel 12.
The water is heated and hot water is discharged from the faucet at the end of the water supply channel 12.

In this state, if the temperature of the water supplied from the water supply channel 12 is extremely low, as shown in FIG. Through the member 27, the pipe portion 21 of the bench lily 20
is moved to the far right side to minimize the passage area between the water control valve 4 and the valve part 22, and the water control valve 4 is
The opening degree of 0 is the minimum. Therefore, the amount of water flowing through the water supply channel 12 decreases, but the negative pressure generated in the negative pressure generating part of the bench lily 20 becomes larger than the amount of water flowing, so the opening degree of the gas valve 15 also becomes larger compared to the amount of water flowing. , the temperature difference between the water supply temperature and the hot water temperature increases. In this case, if the opening degree of the faucet is increased to increase the water flow rate, the negative pressure generated in the negative pressure generating part of the bench lily 20 will increase, and the diaphragm 11 will bend, causing the gas valve 1
At the same time as the opening degree of valve 5 is increased, valve portion 22 is also moved to increase the passage area between tube portion 21. As a result, the increase in the negative pressure is alleviated, and the characteristic curve of the opening degree of the gas valve 15 with respect to the water flow rate has a smaller slope than when the valve part 22 does not move. Since the passage area of is originally small and the slope of the characteristic curve is large when the valve section 22 does not move, the characteristic curve has a relatively large value even if the valve section 22 moves.

When the temperature of the water supplied from the water supply channel 12 rises, the actuator 30a of the temperature sensing member 30 expands, rotates the lever 32 around the pivot pin 33 against the spring 29, and rotates the pipe portion 21 of the bench lily 20. is moved to the left in FIG. 1 to increase the passage area with the valve portion 22 and to increase the opening degree of the water control valve 40. The water supply through this water control valve 40 causes the water supply channel 1 to
2 increases, but the negative pressure generated in the negative pressure generating part of the bench lily 20 becomes small compared to the water flow rate, so the opening degree of the gas valve 15 also becomes small compared to the water flow rate, and the temperature of the water supply and hot water output decrease. The temperature difference in temperature decreases. In this case as well, if the amount of water flow is increased, the opening degree of the gas valve 15 will increase and at the same time the passage area between the pipe section 21 and the valve section 22 will also increase, and the slope of the characteristic curve of the opening degree of the gas valve 15 with respect to the amount of water flow will be This is smaller than when the valve portion 22 does not move. However, in this state, the pipe portion 21
Since the passage area between the valve part 22 and the valve part 22 is originally large and the slope of the characteristic curve when the valve part 22 does not move is small, the slope of the characteristic curve when the valve part 22 moves has a relatively small value. becomes.

As described above, according to this embodiment, when the water supply temperature is low, the water flow rate decreases and the temperature difference between the water supply temperature and the outlet temperature increases, and when the water supply temperature rises, the water flow rate increases and the temperature difference increases. decreases, so even if the water supply temperature changes, the hot water temperature is maintained at a predetermined value. In addition, with this type of gas water heater, in order to keep the hot water temperature at a stable predetermined value regardless of the increase or decrease in the amount of hot water, it is necessary to set the range of increase/decrease in the water supply amount to a low temperature when the hot water temperature is set to a high temperature. However, as mentioned above, the slope of the characteristic curve of the opening degree of the gas valve 15 relative to the water flow rate is smaller when the water supply temperature is low and the temperature difference from the hot water outlet temperature is large. is smaller than when the water supply temperature is low, so
Even if the amount of hot water discharged is increased or decreased, the temperature of the hot water discharged is maintained at a stable predetermined value. Moreover, in order to prevent changes in the outlet temperature due to changes in the water supply temperature, the adjustment member necessary for this purpose is installed in the pipe section 21, which is a part of the component of the bench lily 20.
Since this is done by moving the temperature sensitive member 30, the number of parts is small and the structure is simple, and therefore the manufacturing cost is only slightly increased.

In addition, in this embodiment, a water regulating valve 40 is provided that changes the amount of water flow depending on the temperature of the water supply, but this allows the amount of water flow to be increased when the temperature of the water supply is high, allowing the burner to operate near its maximum capacity. This is for the purpose of Therefore, this water control valve 40 is not necessarily necessary and has no direct relation to the function of the present invention of maintaining the outlet hot water temperature at a predetermined value even if the water supply temperature changes.

In addition, in this embodiment, although the description of the hot water temperature adjustment device has been omitted, a throttle valve may be provided upstream or downstream of the bench lily 20, or a
It is also possible to adjust the hot water temperature by means of, for example, providing a bypass valve that bypasses a portion of the pressure of the vent lily 20 on the upstream or downstream side of the bench lily 20.

[Brief explanation of drawings]

The drawings show an embodiment of the hot water temperature control device for a gas water heater according to the present invention, and FIG. 1 is an overall sectional view;
FIG. 2 is a bottom view thereof. Explanation of symbols, 10...Diaphragm chamber, 10a
...Primary chamber, 10b...Secondary chamber, 11...Diaphragm, 12...Water supply, 15...Gas valve, 20
... Bench lily, 21 ... pipe section, 22 ... valve section,
23... Support rod, 30... Temperature sensitive member, 30a
...actuator.

Claims (1)

[Scope of utility model registration request] The inside of the diaphragm chamber is partitioned by a diaphragm to form a primary chamber and a secondary chamber, and the negative pressure generating part of the bench lily installed in the water supply passage passing through the primary chamber is divided into two.
It communicates with the next chamber, and the diaphragm is deflected as the water flow increases, and this deflection causes the opening of the gas valve to continuously increase, controlling the amount of gas supplied to the burner and keeping the hot water temperature at a predetermined value. In the gas water heater to be maintained, the bench lily has a pipe section with a smoothly constricted inner surface in the middle part, and is inserted into this pipe section and connected to the diaphragm via a support rod, so that it can be connected to the water supply channel as the amount of water flowing increases. The valve includes a tapered valve part that automatically moves along the water line to increase the passage area between the water supply channel and the pipe part, and further has an actuator installed in the water supply channel that expands and contracts according to changes in water temperature. A temperature-sensitive member is provided that moves the pipe connected to the actuator along the longitudinal direction of the water supply channel to increase the passage area between the pipe and the valve in response to a rise in water supply temperature. A hot water temperature control device featuring: