JPH0623871Y2 - Water heater with hot water filling circuit - Google Patents

Description

[Field of Use] [Field of the Invention] The present invention relates to a water heater having a so-called water filling circuit for directly supplying hot water to a bathtub, which is filled with a hot water heater with a fixed outlet temperature. In this case, we plan to shorten the filling time.

[Prior art and its problems] In hot water heaters, especially instantaneous water heaters, a proportional control system has recently become widespread, and in this type of water heater, the hot water temperature is maintained at a set temperature regardless of the amount of hot water discharged. it can.

With this type of instant water heater, the set temperature is
When the temperature is fixed at 60 ° C and 75 ° C in summer, the hot water having the above temperature can be taken out from the hot water supply pipe regardless of the amount of hot water discharged within the range of the hot water supply capacity. Therefore, when a mixed faucet is used in combination, the combination of the hot water discharge temperature and the hot water discharge amount can be variously changed by adjusting the opening degree of the mixed water tap on the water circuit side. Further, as shown in FIG. 4, a water filling circuit (11) is added so that hot water having a set temperature can be directly supplied to the bathtub (1), and the water level detecting means (12) and the water filling valve (13) are connected. If combined, hot water supply can be stopped when the filling of water is completed. However,
In this case, there is a problem that the filling time becomes longer than necessary.

In the above type, in order to maintain the maximum hot water temperature according to the combustion capacity of the burner (2) even under the condition that the faucet (15) on the hot water supply circuit (14) side is fully opened, the heat exchanger (10) This is because the maximum amount of water supplied to the pump is limited to a constant value in advance by the throttle valve (16) or the orifice, so that the amount of hot water discharged cannot exceed the maximum amount of water supplied even when the water is filled.

[Technical problem] The present invention relates to "a water filling circuit (11) for directly supplying hot water to a bathtub (1).
And a proportional valve (20) for maintaining the outlet side temperature of the heat exchanger (10) at the first set temperature during hot water supply and for maintaining the outlet side temperature of the heat exchanger (10) at the filling temperature suitable for bathing during hot water filling. ) And the faucet
In the water heater provided with the first flow rate limiting means provided on the upstream side of the heat exchanger (10) in order to maintain the hot water supply temperature when the (15) is fully opened at the first set temperature, In order to reduce the amount of hot water, it is an object to ensure a sufficient amount of hot water according to the maximum combustion amount of the burner (2) at the filling temperature.

[Means] The technical means of the present invention taken to solve the above-mentioned problem is "the second in the water supply circuit (17) including the first flow rate limiting means".
Flow rate limiting means is provided, and the maximum flow rate of the water supply circuit (17) when limited by the second flow rate limiting means is set so as to be the maximum flow rate capable of maintaining the filling temperature at the maximum combustion of the water heater. A switching means is provided for putting either one of the two flow rate limiting means into an operating state, and when hot water is supplied, only the first flow rate limiting means acts, and when hot water is filled, only the second flow rate limiting means is operated by this switching means. Was made to work. ” In the first embodiment, the throttle valve (16) functions as the first flow rate limiting means, and the combination of the throttle valve (16) and the orifice (32) inserted in the bypass circuit (3) is the second flow rate. It functions as a limiting means. Further, in the second embodiment, the small hole provided in the valve body (36)
The orifice (38) functions as the first flow rate limiting means (37).
Functions as the second flow rate limiting means. Further, in any of the embodiments, the on-off valve (31) functions as a switching means.

[Operation] The above technical means operates as follows.

At the time of hot water supply, the switching means operates the first flow rate limiting means and the proportional valve (20) sets the hot water outlet temperature to the first set temperature, so that the heat exchanger (10) is connected to the first
A limited amount of water is supplied by the flow rate limiting means.
Since the amount of water at this time is set to a value commensurate with the combustion amount of the burner (2), the outlet temperature of the heat exchanger (10) is set to the first setting when the hot water supply faucet is fully opened. Maintained at temperature. Even if the amount of hot water in the hot water supply circuit is reduced, the proportional valve (20)
Is maintained at the first set temperature.

Next, when the water is filled, the temperature on the outlet side of the heat exchanger (10) is maintained at the water filling temperature by the action of the proportional valve (20). By the signal, the switching means is operated, only the second flow rate limiting means is operated, and the hot water outlet temperature is set to the hot water filling temperature, and the flow rate through the heat exchanger (10) can maintain the hot water filling temperature. The maximum flow rate can be increased. That is, at the time of filling with water, the filling temperature is maintained at a temperature suitable for bathing and the bath is filled with the maximum flow rate.

After that, when the filling of the hot water is completed, the switching means is actuated, and each part returns to the hot water supply state.

[Effects] Since the present invention has the above-mentioned configuration, it has the following unique effects.

In the water filling state, the hot water discharge temperature is automatically set to the water filling temperature and the amount of water supplied to the heat exchanger (10) is increased more than in the hot water supply state, so that the time required for the water filling can be shortened.

Since the first and second flow rate limiting means are on the upstream side of the heat exchanger, there is no effect of the amount of heat possessed by the flow rate limiting means on the thermistor serving as the hot water temperature detecting means of the proportional valve, and the outlet of the heat exchanger. There is no relationship with the water filling valve installed on the side. Therefore, the detection accuracy of the thermistor becomes good, and the structure on the outlet side of the heat exchanger can be simplified.

[Embodiment] In the first embodiment shown in FIGS. 1 and 2, a throttle valve (16) is adopted as the first flow rate limiting means, and an opening / closing valve (31) is provided in a bypass circuit (3) that bypasses this. And the orifice (32) are inserted in series, and the other structure is the same as that shown in FIG. Here, the flow rate from the water supply circuit (17) to the heat exchanger (10) when the on-off valve (31) is in the open state depends on the opening of both the throttle valve (16) and the orifice (32). This is the set flow rate. This flow rate is set in advance and is set to match the maximum flow rate at which the temperature on the outlet side of the heat exchanger (10) in the water filling state can be maintained at the water filling temperature suitable for bathing (for example, 43 ° C). .

Next, the electric circuit of this embodiment will be described in detail.

The drive circuit of the proportional valve (20) is a combination of an operational amplifier circuit (21) and an integrating circuit (22), and a transistor (23) connected to the proportional valve (20) by an output signal from this integrating circuit (22). )
Is working. On the input side of the operational amplifier circuit (21), the voltage on the negative side of the thermistor (S) as a sensor that detects the temperature on the outlet side of the heat exchanger (10) and the voltage on the temperature setting circuit (4) side Is input, and the comparison output of these two input values is amplified and the integration circuit (22)
Entered in.

The temperature setting circuit (4) is for connecting the first resistance (41) for setting the first set temperature in summer and the first set temperature in winter, which are connected via the capacity changeover switch (40). It consists of a second resistor (42) and a third resistor (43) for setting the hot water supply temperature (filling temperature) at the time of filling, and the normally closed first output contact (33) of the relay (30) switches the capacity. A normally open second output contact (34) is inserted in the circuit to the switch (40) in the circuit to the third resistor (43). Here, the first set temperature in summer is set to, for example, 75 ° C., the first set temperature in winter is set to, for example, 60 ° C., and the first set temperature is switched by the capacity changeover switch (40).

In the circuit to the relay (30), the operation switch (35) for filling water
And a water level detecting means (12) as a water level detecting means are inserted in series, and a self-holding circuit of the relay (30) is formed in parallel with these series circuits. Also a bypass circuit
The on-off valve (31) and the water filling valve (13) inserted in (3) are connected in parallel with the relay (30), and the operation switch (35)
When is pressed, both the on-off valve (31) and the water filling valve (13) are placed in a conductive state, and when the water level in the bathtub (1) reaches a predetermined water level, they are turned off.

As described in detail above, in this embodiment, the outlet hot water temperature on the outlet side of the heat exchanger (10) is the first resistance due to the operation of the operational amplifier circuit (21) and the integrating circuit (22) in the normal hot water supply state. When the first set temperature set by (41) or the second resistance (42) is maintained and the operation switch (35) is closed to fill the water, the temperature is set by the third resistance (43). It will be maintained at the hot water filling temperature. Further, in the latter case, the on-off valve (31) is opened and the amount of water supplied to the heat exchanger (10) is increased as compared with the former case.

In this embodiment, the on-off valve (31) to be inserted into the bypass circuit (3) and the orifice (32) are separately constructed.
As shown in the figure, the valve body (36) of the on-off valve (31) is provided with a small hole (37) having the same flow restriction function as the throttle valve (16), and further on the upstream side of this valve body (36). The orifice (38) may be inserted. In the case of the second embodiment, when the opening / closing valve (31) is opened, the amount of water supplied to the heat exchanger (10) becomes a value limited by the orifice (38). When the on-off valve (31) of the first embodiment is opened, the heat exchanger (1
Match the amount of water supplied to 0). As a result, the same function as in the first embodiment is achieved. In this example,
The small hole (37) functions as the first flow rate limiting means, and the orifice
(38) functions as a second flow rate limiting means.

[Brief description of drawings]

FIG. 1 is an explanatory view of a first embodiment of the present invention, FIG. 2 is an electric circuit diagram thereof, FIG. 3 is an explanatory view of essential parts of a second embodiment, and FIG. 4 is a conventional water heater for a conventional hot water. It is an explanatory view when a tensioning device is added as it is, in the figure (1) ...... bathtub (10) ...... heat exchanger (11) ...... hot water filling circuit (15) …… faucet (17) …… water supply circuit (20) …… Proportional valve (3) …… Bypass circuit (31) …… Open / close valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-55-97564 (JP, A) JP-A-56-147968 (JP, A) Actually opened 62-189554 (JP, U) Actually opened 59- 133941 (JP, U) Actually opened Sho 59-21440 (JP, U)

Claims (3)

[Scope of utility model registration request] 1. A water filling circuit (11) for supplying hot water directly to a bathtub (1).
And a proportional valve (20) for maintaining the outlet side temperature of the heat exchanger (10) at the first set temperature during hot water supply and for maintaining the outlet side temperature of the heat exchanger (10) at the filling temperature suitable for bathing during hot water filling. ) And the faucet
A water heater comprising: a first flow rate limiting means provided upstream of the heat exchanger (10) for maintaining the hot water temperature when the (15) is fully opened at the first set temperature. A water supply circuit (17) provided with means is provided with a second flow rate limiting means, and the water supply circuit is limited by the second flow rate limiting means.
The maximum flow rate of (17) is set to be the maximum flow rate that can maintain the filling temperature at the time of maximum combustion of the water heater, and a switching means is provided for putting one of the two flow rate limiting means into an operating state. A water heater provided with a water filling circuit in which only the first flow rate restricting means is operated by the switching means when hot water is supplied and only the second flow rate restricting means is operated by the switching means when the hot water is filled. 2. An orifice (32) in which the first flow rate limiting means is a throttle valve (16) or an orifice, and the second flow rate limiting means is inserted in a bypass circuit (3) bypassing the first flow rate limiting means and the throttle. A water heater provided with a water filling circuit according to claim 1, which is a combination of a valve (16) or an orifice and an opening / closing valve (31) in which a switching means is inserted in a bypass circuit (3). 3. A first flow rate limiting means and a second flow rate limiting means are arranged in series, the switching means is an on-off valve (31), and the valve body (36) of this on-off valve serves as the first flow rate limiting means. Small hole (3
A water heater having the hot water filling circuit according to claim 1 which penetrates 7).