JPH0563686B2 - - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial Application Field] The present invention relates to a water temperature regulating device for a gas water heater, which enables a hot water temperature state of a low temperature and a small amount of water, and prevents wasteful consumption of water and gas. be.

[0002]

[Prior Art and Problems] A hot water temperature regulating device for a gas water heater has already been disclosed in Japanese Utility Model Publication No. 58-25241. In this conventional system, as shown in FIG.
A gas flow control valve 11 is provided in the water circuit 2, and a water flow control valve 21 is also provided in the water circuit 2, and both of these control valves are placed in a certain interlocking relationship.

[0003] In this conventional system, the interlocking relationship is set so that it can be changed from a large water volume - small gas volume state to a small water volume - large gas volume state, and in the former setting condition, low temperature hot water is In the latter setting condition, a small amount of high-temperature hot water is taken out, and the temperature of the hot water can be adjusted during this time. In this case, the hot water temperature adjustment range is wider than in a system in which only the amount of water is adjusted while keeping the amount of gas constant.

[0004] However, with this conventional one,
As mentioned above, when taking out hot water at a low temperature, the amount of hot water at that time is large, so depending on the conditions of use, the amount of hot water becomes excessive and the hot water is wasted. The present invention prevents wasteful use of hot water in a device that adjusts the temperature of hot water by interlocking the hot water flow control valve 21 inserted into the water circuit 2 and the gas flow control valve 11 inserted into the gas circuit 1. In order to make this possible, the technical challenge is to be able to set the hot water supply conditions for a small amount of hot water at each set temperature.

[0005] The technical means of the present invention taken to solve the above technical problem is that ``The gas circuit 1 has a separate first flow rate installed at a position where the flow rate gas amount to the gas amount control valve 11 can be restricted. A throttle means 3a is inserted into the water circuit 2, and a separate second flow throttle means 3b is inserted into the water circuit 2 at a position where the amount of water flowing into the water flow rate regulating valve 21 can be restricted.
The gas circuit 1 is configured to be set in two states, a throttled state and a non-throttled state, and can be operated into the same state simultaneously from the outside, and the maximum flow rate of the gas circuit 1 in the throttled state is the flow rate set by the nozzle diameter of the burner. In addition to setting the minimum flow rate of the water circuit 2 in the throttled state to a prescribed value below the minimum flow rate value when the second flow rate restricting means 3b is in the non-throttling state.'' .

【0006】

[Operation] The above technical means of the present invention operates as follows. When both the first and second flow rate restricting means 3a and 3b are in the non-throttled state, the flow rates of the gas circuit 1 and the water circuit 2 are both in the non-throttled state. The hot water temperature is adjusted by mutually interlocking adjustments, that is, by the operation of the hot water temperature adjusting device, and the hot water temperature is brought to the same state as in the past.

[0007] Next, the first and second flow restricting means 3
When a and 3b are in the throttled state, the first flow rate restricting means 3a is placed in a position where it can restrict the amount of gas flowing into the gas amount regulating valve 11, and the second flow rate restricting means 3b is placed in a position where it can restrict the amount of water flowing into the water amount regulating valve 21. Since the valves are inserted in positions where they can be controlled, the flow rate can be adjusted by these operations while the amount of inflow to each control valve is restricted.

[0008] Furthermore, the maximum flow rate of the gas circuit 1 in the throttled state is set to a predetermined value that is lower than the flow rate set by the nozzle diameter of the burner. By the way, in a gas burner, the maximum amount of gas that can be combusted is determined by the nozzle facing the gas burner, so in the gas circuit 1, within the adjustment range of the gas amount control valve 11, the gas flow rate is It changes in the range of large flow rate to small flow rate below the maximum value. Furthermore, since the minimum flow rate of the water circuit 2 in the throttled state is set to a predetermined value that is less than the minimum flow rate value when the second flow rate throttle means 3b is in the non-throttled state, the water volume of the water circuit 2 is reduced. can be set to Therefore, the amount of hot water is reduced, and the temperature of the hot water at this time meets the adjustment conditions of the gas amount regulating valve 11 and the water amount regulating valve 21.

[0009]

[Effects] Since the present invention has the above configuration, it has the following unique effects. In addition to adjusting the hot water temperature only by adjusting the gas amount regulating valve 11 and the water amount regulating valve 21, the small water amount-small gas amount state can be set by simultaneous operation of the first and second flow rate restricting means 3a, 3b. , second flow restricting means 3
By operating steps a and 3b, it is possible to set the hot water temperature in accordance with the usage conditions, and wasteful use of hot water can be prevented.

(Embodiment) The embodiment of the present invention includes first and second embodiments.
The flow rate in each of the above states of the gas circuit 1 and the water circuit 2 is set to a predetermined value so that the hot water temperature set by the hot water temperature regulating device does not change when the flow rate restricting means 3a, 3b are in the throttled state and in the non-throttled state. This is because the value was set to .

[0011] According to this embodiment, the first and second flow restricting means 3a, 3b are set in the restricted state,
The hot water temperature is the same in both the small hot water flow state and the normal use state with the first and second flow rate restricting means 3a and 3b in the non-throttled state, and the hot water temperature at the operation part of the hot water temperature adjustment device is the same in both use states. The temperature display and the hot water temperature match. Therefore, the inconvenience that the hot water temperature changes when changing from the normal usage state to the low water amount state is eliminated.

[0012]

[Embodiment] In the embodiment shown in FIG. 1, a first throttle part 33 as a first flow rate restricting means 3a is inserted in series with the gas amount regulating valve 11, and a
1, a second throttle valve 34 as a second flow rate restricting means 3b is inserted in series, and the valve shafts of the first throttle part 33 and the second throttle valve 34 are connected to the connecting plate 41, so that the throttle state and the non-throttle state are simultaneously established. By setting both of them to the throttle state, a small amount of hot water can be obtained.

[0013] In this embodiment, the first throttle valve 33 and the second throttle valve 34 are set in two states by a snap action mechanism using plate springs 7, 7, and the connecting plate When the operating portion 40 provided at the throttle valve 41 is pulled, the leaf springs 7, 7 become in the state shown by the two-dot chain line in the figure, and the first throttle valve 33 and the second throttle valve 34 become in the non-throttle state. Conversely, when the operating part 40 is pushed in from this state, the gas circuit 1 is communicated only through the first hole 14 provided in the first throttle valve 33 , and the water circuit 2 is connected only through the first hole 14 provided in the first throttle valve 33 . Communicating only through the second hole 15, the gas circuit 1 and water circuit 2 are in a throttled state.

[0014] Next, the gas volume control valve 11 is a needle valve that moves forward and backward by the rotation of its shaft, and the other water volume control valve 21 is a needle valve whose opening degree changes depending on the rotation angle at a certain position. These gas flow control valves 11 and water flow control valves 21 are configured to change their opening degrees simultaneously by an interlocking mechanism, and this interlocking mechanism includes a rack 61 and pinions 62 and 63 that mesh with the rack 61. The operation knob 6 provided on this rack 61
5 is the operating section of the hot water temperature regulating device.

[0015] A temperature display section 64 is provided near the operation knob 65 of the rack 61 as shown in FIG. corresponds to Further, the tapped water temperature is designed to change linearly as shown by the solid line A in FIG. For this reason, the ratio of the diameters of the pinions 62 and 63 is set to a predetermined value, and the ratio of the amount of rotation of the gas amount regulating valve 11 and the water amount regulating valve 21 due to the operation of the rack 61, that is, the degree of change in the amount of throttling, is correlated. Note that here, the maximum flow rate _Q2 of the gas circuit 1 is determined by the nozzle N of the gas burner. [Adjustment of hot water temperature in non-throttle state] As described above, when the first and second throttle valves 33 and 34 are opened, the following hot water temperature adjustment is performed.

[0016] Under this condition, the amount of water in the water circuit 2 is
The amount of gas in the gas circuit 1 changes as shown by the dashed line in A in FIG. 2 depending on the amount of operation of the operating knob 65, and the change in the gas amount in the gas circuit 1 changes as shown in the broken line in A in the same figure. In other words, since the first throttle part 33 is in the open state, the maximum amount of gas supplied to the burner 4 via the gas amount adjustment valve 11 is set by the nozzle N corresponding to the burner 4. The maximum gas amount is _Q2 .
Therefore, at the zero point of the operation amount of the operation knob, burner 4
The amount of gas supplied to becomes the minimum flow rate value Q ₁ through the gas amount control valve 11, and the operation amount reaches the maximum gas amount Q ₂ at which the specified point P is reached, and from then on, the operation amount is increased. However, the gas amount does not change.

[0017] At this time, since the second throttle part 34 is disclosed, the water amount in the water circuit 2 is controlled by the water amount control valve 2.
This corresponds to the adjustment degree of 1. As shown in the figure, the change in the opening degree of the second throttle valve 34 is set to the maximum flow rate Q ₅ in the range where the operation amount is below the specific point P,
When the amount of operation is greater than this, the flow rate decreases linearly, and at the maximum operation amount position of the operation knob, the flow rate is the minimum.
It is set to be Q ₄ .

[0018] Therefore, in the range until the operation amount of the operation knob reaches a specific point P, the gas amount changes under the condition that the water amount is constant, and the hot water temperature changes linearly, and in the area where the operation amount is larger than this, When the amount of gas is constant, the amount of water changes and the temperature of the hot water changes linearly. [Hot Water Temperature Adjustment in Throttled State] Next, when the first and second throttle valves 33 and 34 are in the closed state, the hot water temperature is adjusted as follows.

[0019] The maximum value of the flow rate of the gas circuit 1 in the throttled state is the set flow rate _Q6 by the first hole 14, which is smaller than the maximum value set by the nozzle alone, and as a result, the gas flow rate adjustment valve The flow rate flowing into 11 is in a restricted state. Therefore, when the gas amount control valve 11 is operated in this throttled state, the flow rate changes as shown by the broken line B in FIG. 2. Further, the flow rate of the water circuit 2 in the throttled state is set by the second hole 15, and this flow rate becomes a constant value _Q3 as shown by the dashed line in FIG.

[0020] In this case, in the small water flow state, as shown by the solid line B in the figure, when the operation amount exceeds a specific point _P1 , the maximum temperature remains at a constant value regardless of the adjustment of the hot water temperature control device. The state to be maintained will arise. In the second embodiment shown in FIG. 4, the valve body of the gas governor 35 employed in a normal gas water heater is
The valve body on the water circuit side of the water pressure-responsive gas valve 38, which automatically opens the gas circuit when the water circuit side is opened, is made to correspond to the first restricting portion 33 in the first embodiment. The secondary side circuit of the gas governor 35 is connected to the gas circuit of the hydraulically responsive gas valve 38 so as to correspond to the throttle valve 34.

[0021] The gas governor 35 and the hydraulic pressure-responsive gas valve 38 have a well-known configuration, and by adjusting the secondary pressure adjustment spring, that is, when the biasing force of this spring is set to a large value, the secondary pressure increases. On the other hand, if the biasing force of the secondary pressure adjustment spring is set to a small value, the secondary pressure decreases and the flow rate to the secondary side decreases. In this embodiment, the first and second flow restricting means 3a and 3b utilize this effect.

[0022] For this reason, the first spring holder 37a is placed in contact with the secondary pressure adjustment spring 36 of the gas governor 35, and the second spring holder 37b is placed in contact with the secondary pressure adjustment spring 39 of the hydraulic pressure responsive gas valve 38. These spring holders are connected by a connecting plate 41, and the mechanism part 42 is made to correspond to this operating shaft 43. As the mechanism section 42, a known mechanism can be used as is. For example, a cam plate 45 having a heart-shaped cam groove 44 as shown in FIG.
A configuration can be adopted in which the pin 46 protruding from the operating shaft 43 is fitted into the cam groove 44 so that the operating shaft 43 is constantly biased by the spring 47 in the return direction.

[0023] In this case, when the operating shaft 43 is pushed in and set in this pushed state by the mechanism section 42,
The secondary pressure adjustment springs 36 and 39 are both strongly biased, and the gas circuit 1 and water circuit 2 are in a non-throttled state. This state corresponds to the normal usage state. From this state, when the operating shaft 43 is pushed in, the mechanism groove 42
Due to the action of
6,39 is in a weakly biased state. As a result, the gas pressure flowing into the gas amount control valve 11 in the hot water temperature control device via the water pressure responsive gas valve 38 is set to be low, and the gas amount is set by the gas amount control valve 11 accordingly. The amount is reduced over the entire adjustment range by the gas amount regulating valve 11. At this time, since the gas pressure itself passing through the gas amount control valve 11 becomes low, the flow rate change due to the operation of the gas amount control valve 11 shows the same change in the gas amount range as in normal use. .

[0024] The water pressure flowing into the other water flow control valve 21 is similarly set low, and the water flow set by the water flow control valve 21 is also lower than this water flow control valve 2.
1 over the entire adjustment range. In this way, the gas circuit 1 and the water circuit 2 are in a throttled state and can be used with a small amount of hot water. In this throttling state, the graph of changes in the amount of gas and water corresponding to the amount of operation of the operating knob in the non-throttling state (the broken line in A and the dashed-dotted line in A) is translated downward, as shown in Figure 6. This is shown by the broken line B or the dashed line B. At this time, the parallel movement distance between the line A and the line B becomes a flow rate value Q corresponding to the amount of change in the secondary pressure due to the change in the biasing force of the secondary pressure adjustment springs 36 and 39.

[0025] Also in the case of this embodiment, in the non-restricted state where both the secondary pressure adjustment springs 36 and 39 are strongly biased, the changes in the gas amount and water amount are the same as in the case of FIG. 2, and the hot water temperature also changes linearly, as shown by the solid line. In a bypass heating water heater, the second flow restricting means 3b may be inserted into the bypass water circuit 70 without the heat exchanger 71 as shown in FIG.

[0026] Furthermore, as shown in FIG. 8, the circuit configuration on the downstream side of the water flow control valve 21 includes a large flow rate circuit 22 and a small flow rate circuit 23 that bypasses this and inserts an orifice 24.
It is also possible to form a combined flow path with an on-off valve 32 that opens and closes the large flow rate circuit 22. In this case, when the on-off valve 32 is closed, the flow rate set by the orifice 24 of the small flow rate circuit 23 will flow to the heat exchange side, and the water circuit 2 will be in a throttled state.

[0027] In this device, the combination of the on-off valve 32 that opens and closes the large flow rate circuit 22 and the small flow rate circuit 22 that includes the orifice 24 serves as the second flow rate restricting means 3b.

[Brief explanation of drawings]

[Fig. 1] An explanatory diagram of main parts of a gas circuit and a water circuit according to a first embodiment of the present invention.

[Figure 2] Figure 2 is an explanatory diagram showing changes in hot water temperature, gas amount changes, and water amount changes due to hot water temperature adjustment.

[Figure 3] Explanatory diagram of the operation knob 65 and water temperature display

[Fig. 4] Explanatory diagram of main parts of the second embodiment

[Fig. 5] An explanatory diagram of the main parts of the mechanism section 42

FIG. 6: Change in hot water temperature due to hot water temperature adjustment in the second embodiment;
Explanatory diagram showing changes in gas amount and water amount

[Fig. 7] Main part explanatory diagram of another embodiment

[Fig. 8] Another example of the second flow restricting means 3b

[Fig. 9] Conventional explanatory diagram

[Explanation of symbols]

1...Gas circuit 11...Gas amount control valve 2...Water circuit 21...Water flow control valve 3a...first flow restricting means 3b...Second flow restricting means 33...First throttle valve 34...Second throttle valve.

Claims (1)

[Scope of Claims] 1. A hot water temperature regulating device that adjusts the temperature of hot water by interlocking a water flow regulating valve 21 inserted into the water circuit 2 and a gas flow regulating valve 11 inserted into the gas circuit 1. In the gas circuit 1, a separate first flow rate restricting means 3a is provided at a position where the amount of gas flowing into the gas amount regulating valve 11 can be restricted, and in the water circuit 2, the amount of water flowing into the water amount regulating valve 21 can be restricted. Separate second flow rate restricting means 3b are inserted in the respective positions, and the first and second flow rate restricting means 3a, 3b are configured to be able to be set in two states, a restricted state and a non-restricted state, and the same can be controlled from the outside. make it operational to the state;
The maximum flow rate of the gas circuit 1 in the throttled state is set to a predetermined value below the flow rate set by the nozzle diameter of the burner, and the minimum flow rate of the water circuit 2 in the throttled state is set by the second flow rate throttling means 3b. A water temperature adjustment device for a gas water heater that is set to a predetermined value that is less than the minimum flow rate value when in a non-throttled state. 2 The gas circuit 1 and the water circuit 2 are configured so that the hot water temperature set by the hot water temperature regulating device does not change between when the first and second flow rate restricting means 3a and 3b are in the throttled state and in the non-throttled state. The hot water temperature regulating device for a gas water heater according to claim 1, wherein the flow rate in each state is set to a predetermined value. 3 The first flow rate restricting means 3a is connected to the gas flow rate control valve 1.
A first throttle part 33 is provided in series with the first throttle part 33 and can be set in two states: a throttle state and a non- throttle state,
The second flow restricting means 3b is a second restricting valve 34 which is provided in series with the water flow control valve 21 and can be set to two states: a non-restricted state and a non-restricted state. Water temperature adjustment device for gas water heaters. 4. A gas governor 35 in which the first flow rate restricting means 3a is provided upstream of the gas amount control valve 11 of the gas circuit 1.
and a first spring presser 3 that sets the secondary pressure adjustment spring 36 of this gas governor into a strongly biased state and a weakly biased state.
7a, and the second flow rate restricting means 3b is configured to strongly bias the water pressure-responsive gas valve 38 provided upstream of the water flow adjustment valve 21 of the water circuit 2 and the secondary pressure adjustment spring 39 of this water pressure-responsive gas valve 38. The second set to a weakly energized state
A spring presser 37b, and the first and second spring pressers 3
The hot water temperature regulating device for a gas water heater according to claim 1 or 2, wherein 7a and 37b can be operated simultaneously.