JPS6249514B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hot water outlet temperature control device applied to a water heater using gas or oil as fuel to control the outlet temperature to a desired set temperature. It is.

[Conventional technology]

Conventionally, in this type of water heater, it has been desired that the hot water outlet temperature be stably maintained at a set temperature. This outlet temperature may be controlled by adjusting the flow rate of water supplied to the heat exchanger or by adjusting the flow rate of fuel supplied to a burner for heating the heat exchanger. is possible.

As an example, a valve body includes an inlet passage and an outlet passage that communicate with each other via a port, a main valve that controls the opening area of the port in order to adjust the pressure in the outlet passage, and a main valve that controls the opening area of the port to adjust the pressure in the outlet passage. A servo valve diaphragm that is displaced under pressure;
a servo valve for controlling the position of the main valve according to the displacement of the servo valve diaphragm; a first adjustment screw movable between two positions in a direction parallel to the displacement direction of the servo valve diaphragm; A second adjustment screw movable in the axial direction relative to the first adjustment screw.
There is a pressure regulator for a gas combustor described in Japanese Utility Model Publication No. 55-7723 that is equipped with an adjustment screw and a spring provided between this second adjustment screw and the servo valve diaphragm.

Another example is to form a diaphragm operating chamber and a float operating chamber that communicate with each other through a water hole in the valve body, and to divide the diaphragm operating chamber into two chambers, one facing the water hole and the other not facing the water hole. A diaphragm partitioning the diaphragm into a diaphragm and a ventilary section in the float operating chamber are provided, and a float that can move forward and backward into the ventilary section as the amount of water changes is slidably housed in the float operating chamber to allow water to flow through the diaphragm operating chamber. There are water pressure responsive devices such as the gas instantaneous water heater described in Publication No. 14068/1983 that communicates the chamber that does not face the hole with the ventilate section.

[Problem that the invention seeks to solve]

The hot water temperature control device for conventional water heaters was developed in 1983.
The one published in Japanese Utility Model Publication No. 7723 is for adjusting the pressure of the fuel gas supplied to the gas combustor to a desired set value, and the one published in Japanese Utility Model Publication No. 14068/1972 is for easily controlling the water volume and temperature. , the gas valve is designed to ensure that the gas valve opens even when hot water is used in a wide range from large volumes to small volumes, but the systems described in both publications do not have controls that respond to changes in water inlet temperature in summer and winter. There was a problem that I couldn't do it.

This invention was made in order to solve the above problems, and is a water heater that can stably maintain the hot water temperature at a desired set value even if there are changes in the inlet water temperature in summer or winter. The purpose is to provide a temperature control device.

[Means for solving problems]

The hot water outlet temperature control device for a water heater according to the present invention includes an electromagnetic pressure feeding device for forcefully feeding fluid into a pressure chamber, an actuator including a responsive body that senses the pressure in the pressure chamber and displaces the fluid, and an actuator between an inlet passage and an outlet passage. A valve body that adjusts the pressure of water in the outlet passage by changing the opening area; a diaphragm that supports the valve body and is arranged to receive pressure in the inlet passage or the outlet passage; A control valve is comprised of a spring provided between the responsive body and the diaphragm, and controls the flow rate of water supplied to the heat exchanger of the water heater, and the temperature of the hot water taken out from the heat exchanger. A temperature sensor detects the water temperature, a comparator that compares the water temperature detected by the temperature sensor with a set temperature, and a signal from the comparator is supplied to control the water temperature to a desired value. It is equipped with a controller that controls the above control valve.

[Effect]

The hot water outlet temperature control device for a water heater according to the present invention includes a regulator mechanism that includes a diaphragm and a valve body as means for controlling the flow rate of water supplied to a heat exchanger, and a specific actuator that controls the set pressure of this regulator mechanism. The temperature of hot water discharged from the heat exchanger is detected by a temperature sensor, the detected temperature is compared with a set temperature, and the output signal is used to control the control valve. As a result, the water flow rate is stably maintained at a desired set value in response to changes in the inlet water temperature, and the outlet temperature can also be accurately controlled.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. The water heater indicated by reference numeral 1 in FIG. 1 has a heat exchanger 1a and a burner 1b for heating the heat exchanger 1a.
The hot water is supplied through a system 3 and taken out through a system 3. In addition, a control valve 4 is provided in the system line 2 to control the flow rate of water supplied to the heat exchanger 1a, and a temperature sensor 5 is inserted in the system line 3 to detect the temperature of the outlet hot water. . The output of this temperature sensor 5 is the set temperature SP in the comparator 6.
and an output corresponding to the difference is supplied to the controller 7. The controller 7 is configured to reduce the flow rate of water supplied to the heat exchanger 1a through the system 2 if the outlet temperature is lower than the set temperature SP, and to increase the flow rate if the outlet temperature is higher than the set temperature SP.
Controls the drive signal supplied to the control valve 4.

An example of a specific structure of the control valve 4 is shown in FIG. An inlet passage 9 and an outlet passage 10 through which water flows are formed within the housing, designated 8 in FIG. 2, and both communicate with each other at a port 11. Further, a diaphragm 12 provided to receive the pressure in the outlet passage 10 supports a valve body 14 for adjusting the opening area of the port 11 via a rod 13. Further, reference numeral 15 indicates a spring provided as necessary so as to press the valve body 14 in a direction to close the port 11.

On the other hand, the housing 8 includes a cylindrical connecting member 16.
The actuator 20 is attached by the rod 26 of the actuator 20 and the diaphragm 12.
and spring holders 17 and 18, respectively.
A spring 19 for pressure setting is provided through the spring 19.

The actuator 20 includes an electromagnetic pump 2 housed in a casing 21, as shown in detail in FIG.
It has 2. The electromagnetic pump 22 receives a drive signal supplied to the coil 23 from the controller 7 and pumps a liquid (for example, oil) contained in a first chamber 24 formed in the casing 21 to a second chamber 23. This second chamber 25
The internal pressure causes a reaction body 27 supporting the rod 26 to be displaced. Further, a communication passage 28 is provided for returning the fluid in the second chamber 25 to the first chamber 24, and a predetermined resistance is applied to the fluid flowing through the communication passage 28 by an orifice 29. .

Therefore, when a drive signal is supplied from the controller 7, the electromagnetic pump 22 pumps the liquid in the first chamber 24 to the second chamber 25 to increase the internal pressure, and senses this increase in pressure. The responsive body 27 moves downward in the figure. Due to this movement of the response body 27,
The aforementioned rod 26 attached to this lowers, and the set pressure applied to the diaphragm 12 via the spring 19 increases. On the other hand, the second room 2
If the pressure inside 5 decreases, the rod 26 will rise,
The set pressure becomes lower. Since the diaphragm 12 is provided to receive the pressure in the outlet passage 10, the valve body 1 is placed at a position where this pressure and the set pressure are balanced.
4, thereby controlling the pressure.

FIG. 4 shows another form of actuator 20 applicable to the present invention. In this example, an electromagnetic compressor 32 for pumping air into a pressure chamber 31 corresponding to the second chamber 25 is used instead of the electromagnetic pump 22 shown in FIG. This electromagnetic compressor 32 has a coil 33 to which a drive signal is supplied, and a cylindrical body 35 that supports a plunger 34 that reciprocates at the center of the coil 33. A piston 36 movable within the cylindrical body 35 is connected to the plunger 34, and the reciprocating motion of the piston 36 alternately pressurizes and depressurizes the inside of a cylinder chamber 37 formed within the cylindrical body 35.
The cylinder chambers 37 each have a check valve 3.
Suction chamber 40 and discharge chamber 41 containing 8 and 39
The suction chamber 40 communicates with the outside through a suction hole 42, and the discharge chamber 41 communicates with the pressure chamber 31 through a communication hole 43. Also, the discharge chamber 41
It also communicates with the outside via a passageway 44 having flow restricting means such as an orifice. Furthermore, the check valve 38 is pressed in the direction of closing the suction hole 42 by the spring 45, and the check valve 38 is
9 is pressed by a spring 46 in the direction of closing the passage between the cylinder chamber 37 and the discharge chamber 41.

A plunger 34 and a piston 36 connected thereto are driven by a drive signal supplied to the coil 33.
When the pressure chamber 31 reciprocates, air sucked through the suction hole 42 is forced into the pressure chamber 31, and the pressure inside the chamber 31 increases. That is, when the piston 36 moves upward in FIG. Air is inhaled. Also piston 36
In the process of descending, the air in the cylinder chamber 37 and the suction chamber 40 is compressed, so the check valve 38 is held in the position where the suction hole 42 is closed.
The check valve 39 moves against the spring 46 and opens a passage between the cylinder chamber 37 and the discharge chamber 41. As a result, the air in the cylinder chamber 37 is
Pressure chamber 31 through discharge chamber 41 and communication hole 43
A portion of the fluid flows into the interior and a portion is discharged to the exterior through the passage 44. When the pressure within the pressure chamber 31 increases due to this operation, the responsive body 27 is pushed down, and the responsive body 27 and the rod 26 are lowered, as in the case of FIG.

FIG. 5 also shows that the diaphragm 12 is connected to the inlet passage 9.
The figure shows the case where it is installed to receive internal pressure. In FIG. 5, parts that are the same as those in FIG. 2 are designated by the same reference numerals, and elements for applying a set pressure to the diaphragm 12 are the same as those in FIG. 2, so their description will be omitted. A valve body 14 connected to the diaphragm 12 via a rod 13 controls the flow rate by adjusting the opening area between the inlet passage 9 and the outlet passage 10 in response to the pressure within the inlet passage 9. conduct.

As described above, according to the present invention, the heat exchanger 1a
As a means for controlling the flow rate of water supplied to the control valve 4, the control valve 4 is composed of a regulator mechanism including a diaphragm 12 and a valve body 14, and a specific actuator 20 that controls the set pressure of this regulator mechanism.
The temperature of hot water from the heat exchanger is detected by a temperature sensor, the detected temperature is compared with the set temperature, and the output signal is used to control the control valve. is stably maintained at a desired set value in response to changes in the inlet water temperature, and thus the outlet temperature is also accurately controlled.

In the above embodiment, the output of the comparator 6 indicating the difference between the hot water temperature detected by the temperature sensor 5 and the set temperature is used as the control signal given to the controller 7. means of,
For example, it may be configured such that a signal corresponding to a manually set temperature is directly given to the controller 7 as a control signal. Alternatively, a flow sensor for detecting the flow rate of hot water can be provided in the system 3, and the difference when this flow rate value is compared with a set value can be used as a control signal. If necessary, both a temperature sensor 5 and a flow sensor may be provided.

〔Effect of the invention〕

As described above, according to the present invention, a hot water outlet temperature control device for a water heater includes a regulator mechanism including a diaphragm and a valve body as a means for controlling the flow rate of water supplied to a heat exchanger, and an actuator that controls the set pressure of the regulator mechanism. a control valve consisting of a control valve; a temperature sensor that detects the temperature of hot water coming out of the heat exchanger;
Consisting of a comparator that compares the temperature detected by this temperature sensor with a set temperature, and a controller that is supplied with a signal from this comparator and controls the control valve described above to control the temperature of the hot water to a desired value. Therefore, even if there is a change in the incoming water temperature in summer or winter, the outgoing water temperature can be stably maintained at a desired set value.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet of a water heater to which a hot water temperature control device according to an embodiment of the present invention is applied, and FIG. 2 is a longitudinal sectional view of a control valve used in the device of FIG.
FIG. 3 is a longitudinal sectional view of an actuator of the same control valve, FIG. 4 is a longitudinal sectional view of another actuator, and FIG. 5 is a longitudinal sectional view of a part of another control valve. 1... Water heater, 1a... Heat exchanger, 1b... Burner,
2, 3... System line, 4... Control valve, 5... Temperature sensor, 6
…Comparator, 7…Controller, 8…Housing,
9... Inlet passage, 10... Outlet passage, 12... Diaphragm, 14... Valve body, 16... Connection member, 20... Actuator, 22... Electromagnetic pump, 23... Coil, 2
4...1st room, 25...2nd room, 26...rod, 27
...Response body, 31...Pressure chamber, 32...Electromagnetic compressor, 33...Coil, 36...Piston.

Claims (1)

[Claims] 1. An electromagnetic pressure-feeding device for force-feeding fluid to the pressure chamber, an actuator equipped with a responsive body that senses the pressure in the pressure chamber and displaces the pressure, and changing the opening area between the inlet passage and the outlet passage to A valve body that adjusts the pressure of water in the passage, a diaphragm that supports the valve body and is arranged to receive the pressure in the inlet passage or the outlet passage, and a diaphragm that is provided between the response body and the diaphragm. a control valve for controlling the flow rate of water supplied to the heat exchanger of the water heater; a temperature sensor for detecting the temperature of the hot water taken out from the heat exchanger; A comparator for comparing the detected hot water temperature with a set temperature, and a controller to which a signal from the comparator is supplied and controls the control valve to control the temperature of the hot water to a desired value. Water heater temperature control device.