KR960004852B1 - Controller of a hot-water supply - Google Patents

Abstract

The device regulates the temperature of the hot water changed suddenly. The device comprises a proportional controller(C) which regulates the water temperature by controlling a burner, a by-pass circuit(2) which goes around a heat exchanger(10), and a flow controller(3) which is installed at the branch point of the heated circuit(1) and the by-pass circuit(2). The outlet temperature of the heat exchanger(10) is maintained at a reference temperature to prevent the abnormal overheating.

Description

Hot water supply control device

1 is an explanatory view of the principle of the present invention.

2 is a schematic illustration of an embodiment of the present invention.

3 is a detailed diagram of the relationship between the first control valve and the second control valve.

4 is a perspective view of the first adjustment valve.

FIG. 5 is a graph showing the relationship between the rotation angle of the screw shaft and the flow rate when the first adjusting valve and the second adjusting valve are simultaneously adjusted when the tap is fully opened.

6 is a graph showing the relationship between the rotational angle of the screw shaft and the bypass flow rate ratio.

7 is a block diagram of a gas proportional control device.

8 is a block diagram of a signal output unit.

9 is a sectional view of another embodiment of the first regulating valve.

FIG. 10 is a cross-sectional view taken along the line X-X of FIG.

* Explanation of symbols for main parts of the drawings

1: heating circuit 2: bypass circuit

3: flow rate control device 4: male governor

30: signal output section 31: first adjustment valve

32: second regulating valve M: drive device

The present invention relates to a hot water supply control device, and more particularly, to a hot water supply control device capable of keeping the discharge hot water temperature at a set temperature in response to an instantaneous temperature change.

Hot water supply control devices have been often proposed to allow the discharge hot water temperature to be maintained at a set temperature. Recently, the discharge hot water temperature is set even if the hot water discharge amount is changed by controlling the combustion amount from the relationship between the discharge hot water temperature and the set temperature. To maintain the temperature.

However, the hot water supply control device of this type cannot cope with the boiling phenomenon and the so-called cold water sand phenomenon in which cold water is discharged when hot water is re-discharged. Therefore, in order to prevent such a problem, the introduction of the bypass mixing in which the distribution ratio can be adjusted so that this distribution ratio can be adjusted in response to the change in the outlet temperature of the heat exchanger is disclosed in Japanese Patent Application No. 3-186150. Proposed in the issue.

In Japanese Patent Application No. 3-186150, in the boiling process and the cold water sand phenomenon, the boiling rate and the cold water are controlled by adjusting the ratio of the flow rate of the circuit to be heated through the heat exchanger and the bypass flow rate not passing through the heat exchanger. Send conditions can be mitigated.

However, even in such a conventional case, the heat exchanger is abnormally overheated depending on the conditions, so that the cold water sand prevention effect is not sufficient.

In order to adjust the distribution ratio of the circuit to be heated and the bypass circuit, in this conventional case, only the flow rate of the bypass circuit is adjusted, so that an overload occurs in the flow rate of the circuit to be heated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and has been provided with a "proportional control device in which the discharge hot water temperature is maintained at the hot water discharge set temperature by adjusting the combustion amount of the burner in response to the change in the hot water discharge amount, Apart from the circuit 1 to be heated, a bypass circuit for bypassing the smoke exchanger 10 is provided, and a flow rate control device (at the branch of the circuit 1 to be bypassed) is provided. 3) is provided, and the hot water supply control device of the hot water supply device in which the flow rate ratio adjusting device 3 is operated so that the heat exchanger 10 exit temperature of the circuit to be heated 1 is maintained at a predetermined heating set temperature. The purpose is to prevent abnormal overheating.

In order to achieve the above object, the hot water supply control device according to the first embodiment of the present invention, "flow control device (3) installed in the branch of the heating circuit 1 and the bypass circuit (2) is driven By the operation of the device M, the opening degree of the first regulating valve 31 inserted into the heating circuit 1 side and the second regulating valve 32 inserted into the bypass circuit 2 side is simultaneously adjusted. With the configuration, the water governor 4 is inserted into the upstream side of the flow rate ratio adjusting device 3 to set the pressure difference on the downstream side of the heat exchanger 10 to be constant, and the discharge hot water temperature is maintained at the set temperature. In order to maintain the hot water temperature at the outlet side of the heat exchanger 10 at a temperature higher than the water temperature, the ratio of the opening degree on the side of the circuit to be heated (1) and the opening degree on the side of the bypass circuit (2) is calculated. And a signal output unit 30 for outputting an operation signal in response to the operation value to the driving device M. , The relationship between the operation amount of the drive device (M) and the opening degree of the second adjustment valve 32 is gradually increased as the operation amount of the drive device (M) increases, the driving degree of the second adjustment valve 32 is increased, The relationship between the opening degree of the device M and the first regulating valve 31 is maintained at a constant opening degree until the operating amount of the driving device M reaches a predetermined value, and the opening of the first adjusting valve 31 is increased as it increases. To increase gradually.

The hot water supply control device as described above operates as follows.

The discharge hot water temperature from the hot water supply is controlled to be maintained at the set temperature by the proportional controller.

Under these conditions, the opening degree of the first and second regulating valves 31 and 32 is set by the signal output unit 30 so that the outlet side temperature of the heat exchanger 10 is a predetermined temperature higher than the water supply temperature. .

At this time, except that the injection water temperature is low and the set temperature is high, in order to maintain the temperature at the outlet side of the heat exchanger 10 at the above value, the flow rate on the side of the heating circuit 1 is related to the bypass circuit 2. It is desirable to be set constant without.

Even when the bypass flow rate ratio is set to increase, if the opening degree of the first regulating valve 31 is constant up to a predetermined value of the bypass flow rate ratio, the flow rate on the side of the heated circuit 1 is kept constant. By the male governor 4, the pressure difference between the inlet side and the joining point of the to-be-heated circuit 1 and the bypass circuit 2 is kept constant. However, when the flow rate on the bypass circuit side increases, even if the pressure difference is constant, the flow rate on the side of the circuit to be heated 1 is suppressed by the increase in resistance at the confluence point, which tends to cause the phenomenon. However, in the above configuration, since the opening degree of the first regulating valve 31 is set to be expanded under such conditions, the tendency of the phenomenon is eliminated and the flow rate on the side of the heating circuit 1 is kept constant.

Since the shortage of the flow rate of the circuit to be heated 1 does not occur, the amount of heat to be heated by the heat exchanger 10 may be reduced, thereby preventing the heat exchanger 10 from becoming an abnormally heated state close to boiling. In addition, the state as described above can be secured quickly after the start of hot water supply.

In the first embodiment of the present invention, even in a condition where the injection water temperature is low and the set temperature is high, hot water at the set temperature can be surely released, and the cold water sand phenomenon is greatly alleviated.

Hot water supply control device according to a second embodiment of the present invention for achieving the above object is "flow rate control device 3 installed in the branch of the bypass circuit (2) of the heating circuit (1) is driven By the operation of the device M, the opening degree of the first regulating valve 31 inserted into the heating circuit 1 side and the second regulating valve 32 inserted into the bypass circuit 2 side is simultaneously adjusted. In the constitution, a water governor 4 for inserting the secondary pressure on the downstream side is inserted into the upstream side of the flow rate control apparatus 3, and the heat exchanger 10 is maintained while the discharged hot water temperature is maintained at the set temperature. In order to maintain the outlet hot water temperature of) at a constant temperature higher than the water supply temperature, the ratio of the opening degree of the circuit to be heated (1) to the opening degree of the bypass circuit (2) is calculated and the calculated value is calculated. A signal output unit 30 for outputting a reaction signal to the driving device M is provided, and the driving device M is provided. The relation between the operation amount and the opening degree of the second adjustment valve 32 is that the second adjustment valve 32 is closed until the operation amount of the drive device M becomes a set operation amount from zero point. When it exceeds, the opening degree of the second regulating valve 32 gradually increases, and the relationship between the operation amount of the driving device M and the opening degree of the first adjusting valve 31 is determined by the operating amount of the driving device M. In the range of the operation amount or more, the opening degree of the 1st control valve 31 is maintained on the conditions which become a constant flow rate, and in the range below the said setting operation amount, as the operation amount of the drive device M decreases, the 1st control valve 31 ) So that the degree of openness decreases gradually.

The hot water supply control device as described above operates as follows.

Under conditions where the temperature of the injected water to the heat exchanger 10 is low and the set temperature is high in winter, even if the heat quantity of the heat exchanger 10 by the burner is set to the maximum value, when the discharged hot water temperature is set high, sufficient hot water may come out. none. Under these conditions, the opening degree of the first regulating valve 31 by the signal output unit 30 is tightened such that the outlet side temperature of the heat exchanger 10 is a predetermined temperature higher than the water supply temperature in the range of less than or equal to the set opening degree. . That is, a predetermined degree of heating rise by the heat exchanger 10 may be ensured even under a low injection water temperature.

In the state where the injection water temperature becomes high and the discharged hot water temperature by the heat exchanger 10 by the burner has a margin, it operates in the same manner as in the first embodiment, and the flow rate heated while passing through the heat exchanger 10 is It is always kept constant. In other words, there is no excessive shortage in the flow rate of the circuit to be heated 1.

Therefore, since the discharged hot water temperature at a low injection water temperature and a high set temperature is reliably ensured, and the flow rate of the circuit to be heated 1 is not excessive, there is a problem that the cold water sand state continues for a long time when the hot water is re-discharged. Can be prevented.

The embodiments of the present invention as described above will be described in detail with reference to the drawings below FIG. 2.

In the present embodiment, the water supply circuit 40 is configured to branch to the heated circuit 1 through the heat exchanger 10 and the bypass circuit 2 bypassing the heat exchanger 10 according to FIG. Flow rate ratio control device 3 is installed at the branch of the circuit to be heated 1 and bypass circuit 2 so that the water supply circuit 40 to the flow rate rate control device 3 detects the injection water temperature. The temperature sensor T ₀ is further provided with a discharge hot water temperature sensor T ₂ that detects the discharge hot water temperature on the downstream side of the confluence portion N of the heating circuit 1 and the bypass circuit 2.

The combustion amount of the gas burner B corresponding to the heat exchanger 10 is controlled by the gas proportional valve G. For this reason, in this embodiment, the so-called feedback gas proportional control apparatus C shown in FIG. 7 is employed. The gas proportional control device C compares the output of the setter S for setting the discharge hot water temperature with the detection output of the discharge hot water temperature sensor T ₂ , and calculates an opening accuracy signal to the gas proportional valve G. The signal output corresponding to this calculated value is applied to the gas proportional valve (G). On the other hand, the description for this is omitted because it is known.

The flow rate control device 3, which is a main component of the present embodiment, includes a first adjustment valve 31 for adjusting the opening degree of the inlet portion 11 to the heating circuit 1 and an inlet portion for the bypass circuit 2. The driving device M for simultaneously driving the second adjustment valve 32 for adjusting the opening degree of the 21, the detection output of the injection water temperature sensor T ₀ , and the detection of the discharge hot water temperature sensor T ₂ . And a signal output unit for inputting an output corresponding to a set temperature and an output corresponding to a set temperature, and outputting a predetermined operation signal. The first regulating valve 31 and the second regulating valve 32 are embedded in the valve unit body V. At the same time, the valve device main body V is a male guard circuit inserted into the valve chamber 33 which receives the first regulating valve 31 and the second regulating valve 32 from the inlet 41 of the water supply circuit 40. The nugget 4 is built in, and the secondary air chamber 43a partitioned by the diaphragm 42 is connected and communicated with the bypass circuit 2 side.

This male governor 4 makes the pressure difference between the pressure of the air chamber 43a and the pressure of the air chamber 43b communicated with the valve chamber 33 constant. Therefore, the resistance from the air chamber 43b to the joined portion N of the heated circuit 1 and the bypass circuit 2 in communication with the air chamber 43a can be made constant, Regardless, the downstream flow rate is determined by the pressure difference to become a constant flow rate.

In addition, the first regulating valve 31 and the second regulating valve 32 are embedded in the valve unit body V so as to rotate integrally with the output of the drive unit M, as shown in FIG. Although driven by a valve shaft 34 penetrating (33), this valve shaft 34 is integrally connected with a screw shaft 35 provided at an axial end of the valve chamber 33, and this screw shaft 35 ) Is combined with the output of the drive unit (M). Therefore, the valve shaft 34 rotates by the same angle and moves back and forth in the axial direction in response to the rotation angle of the output portion of the drive unit M. FIG.

The first regulating valve 31 is fixed to the valve shaft 34 and is received in a cylindrical treatment with respect to the valve chamber 33, and the closing degree of the inlet portion 11 changes in response to the rotational angle of the valve shaft 34. do. The other second regulating valve 32 rotates in the same manner as the valve shaft 34 and moves forward in the axial direction in the shape of a rotating body integrally coupled with the valve shaft 34.

As shown in FIG. 4, the first regulating valve 31 has a cylindrical shape and its cross section faces the inlet 11. This cross section is set to a predetermined shape. The rotation angle of the output part of the drive device M is set to 270 °, and the inlet part (when the rotation angle of the drive device M is from 0 ° to 90 ° according to the cross-sectional shape of the first adjustment valve 31). The opening degree of 11) is increased proportionally, and when it exceeds 90 °, the opening degree of the inlet portion 11 is set to be constant. Accordingly, when the faucet J provided in the hot water discharge circuit is completely opened, the flow rate of the heated circuit 1 changes as shown in? In FIG.

On the other hand, the second adjustment valve 32 is fitted to have a certain range of movement margin in the axial direction with respect to the valve shaft 34, the movement margin is the valve by the rotation of the output portion of the drive unit 270 ° It is set to 1/3 of the axial movement amount of the shaft 34. The distal end portion facing the inlet portion 21 is a conical portion, and the plunger portion has a continuous shape. The diameter of the plunger portion is larger than the inlet portion 21. In addition, the second adjustment valve 32 is pushed toward the inlet 21 by a spring 36, and when the rotational angle of the output of the drive device M exceeds 90 °, the cone-shaped portion is inserted into the inlet 2. Will be inserted. In addition, the shape of the conical portion is set to a predetermined shape in advance so that the opening degree of the inlet portion 21 is proportionally increased in the range of the rotation angle of the driving device M from 0 ° to 90 °. As a result, when the faucet J provided in the hot water discharge circuit is brought into a fully open state, the flow rate of the circuit to be heated 1 changes as shown in? In FIG.

By setting the 1st adjustment valve 31 and the 2nd adjustment valve 32 as mentioned above, the whole flow volume is set so that it may change as (3) of FIG. 5 in the fully open state of the faucet J. As shown in FIG. In addition, the flow rate ratio on the bypass circuit 2 side, that is, the bypass flow rate ratio, to the flow rate on the side to be heated 1 changes as shown in FIG. 6 regardless of the degree of opening of the faucet J. FIG.

The pressure difference between the inflow water pressure into the valve chamber 33 by the water governor 4 and the water pressure of the confluence portion N of the heating circuit 1 and the bypass circuit 2 is affected by the hydraulic pressure fluctuation of the water supply circuit 40. This is because it is set to be constant regardless, and the opening degree of the inlet part 11 and the inlet part 21 is adjusted simultaneously, and the bypass flow rate ratio is adjusted.

The description of the signal output unit 30 is as follows.

The signal output unit 30 inputs a detection output of the injection water temperature sensor T ₀ and a signal from the discharge hot water temperature setter S to correspond to the detection value of the injection water temperature sensor T ₀ . From the first operating unit 30a for calculating the value obtained by subtracting the set temperature S ₁ of the discharged hot water temperature setter S from the value T 50 added to the temperature T ₁ , and from the set temperature S ₁ . Drive based on the ratio of the second operation unit 30b that calculates the temperature T ₀ minus _v , the output signals from the first and second operation units 30a and 30b, and the bypass ratio of FIG. It consists of a rotation angle signal setting part 30c which sets the output rotation angle signal of the apparatus M. As shown in FIG. Thus, the output signal of the rotation angle signal setting section 30c is input to the driving device M.

In this case, the opening temperature of the gas proportional valve G is controlled by the gas proportional control device C so that the discharge hot water temperature becomes the set temperature S ₁ by the discharge hot water temperature setter S. FIG. When the flow rate, the set temperature, the injection water temperature, and the thermal efficiency of the heat exchanger 10 are determined, as long as the gas type is constant, the heating amount by the gas burner B is controlled by the heating circuit 1 and the bypass circuit 2. The discharge hot water temperature is set to the discharge hot water set temperature by the gas proportional valve G by the gas proportional control device C because it becomes a constant value irrespective of the distribution ratio. Thus, in order to exactly match the discharge hot water temperature to the set temperature, the above operation is executed by so-called feedback control.

Next, the signal output unit 30 sets the outlet temperature of the heat exchanger 10 to a temperature higher than, for example, 50 ° C. above the detection temperature of the injection water temperature sensor T ₀ , and maintains the discharge hot water temperature S ₁ . Compute the rotation angle signal for Once the set temperature (S ₁ ) is set to a predetermined temperature, the water supply is constant and the outlet temperature of the heat exchanger (10) becomes a temperature higher than the detection temperature of the inlet water temperature sensor (T ₀ ) by 50 ℃, the heating temperature ( The flow rate ratio between 1) and the bypass circuit 2 is a ratio of "(S ₁ )-(T ₁ )" and "(T ₁ ) + 50- (S ₁ )" (see Fig. 8).

In this embodiment, the output ratio of the second operation unit 30b and the output ratio of the first operation unit 30a are the above values. Therefore, the bypass ratio set by the rotation angle signal setting section 30c is suitable for the above condition. In this manner, the control operation is performed by the combination of the gas proportional control device C and the gas proportional valve G in the state where the bypass ratio is set.

In the case of the control of the above embodiment, since the flow rate on the side of the circuit to be heated 1 is maintained at a temperature 50 ° C higher than the inlet water temperature of the heat exchanger 10, there is a lack of overheating in the heat exchanger 10. It does not occur.

In particular, in the above embodiment, the pressure difference between the confluence portion N connected to the air chamber 43a and the valve chamber 33 connected to the air chamber 43b is controlled to be constant, and the first adjustment valve ( Since the opening degree of 31) changes to correspond to the change in? In FIG. 5, a situation in which the flow rate of the heated circuit 1 decreases when the bypass ratio is increased can be prevented.

In addition, even when the injection water temperature is low and the set temperature is high, the flow rate on the bypass circuit 2 side can be controlled to withdraw the flow rate on the side of the heated circuit 1 by setting the flow rate on the side of the bypass circuit 2 to 0, thereby preventing drain generation and overheating. Preventing hot water at high set temperature.

Meanwhile, in the above embodiment, the first regulating valve 31 shows a change in the opening degree as shown in FIG. 5 by rotation, but may be configured as shown in FIGS. 9 and 10. In this case, the first regulating valve 31 is a cylinder moving in the axial direction. Thus, the semicircular inlet portion 11a and the annular hole 11b are formed in the inlet portion 11, and the inlet portion 11a is partially opened from the partially closed state to the fully open state at a rotation angle of 90 ° of the screw shaft 35. The opening degree is gradually increased, and the screw shaft 35 and the first regulating valve are opened so as to completely open the inlet portion 11a and the inlet portion 11b simultaneously from the inlet portion 11a in the range of 90 ° -270 °. The interlocking relationship of (31) is established.

On the other hand, the flow rate when the inlets 11a and 11b are simultaneously opened is set to show the maximum value of 1 in FIG. 5 in the fully open state of the faucet J. FIG.

Claims (2)

A proportional control device is provided in which the discharge hot water temperature is maintained at the hot water discharge set temperature by controlling the burn amount of the burner in response to the change of the hot water discharge amount, and bypasses the heat exchanger separately from the heating circuit. A pass circuit is provided, and a flow rate ratio adjusting device is provided at a branch of the heated circuit and the bypass circuit, and the flow rate ratio adjusting device is configured to maintain the heat exchanger outlet temperature of the heated circuit at a predetermined heating set temperature. In the hot water supply control device of the hot water supply that is operated, the flow rate ratio adjusting device (3) installed in the branch of the heating circuit (1) and the bypass circuit (2) by the operation of the drive device (M). The opening degree of the 1st adjustment valve 31 inserted in the heating circuit 1 side and the 2nd adjustment valve 32 inserted in the bypass circuit 2 side is adjusted simultaneously, On the upstream side of the air flow rate adjusting device 3, a burner 4 is inserted in which the number of the pressure difference on the downstream side of the heat exchanger 10 is constantly set, and the heat exchange is performed while the discharged hot water temperature is maintained at the set temperature. In order to maintain the outlet hot water temperature of the apparatus 10 at a temperature higher than the water supply temperature, the ratio of the opening degree of the heating circuit 1 side and the opening degree of the bypass circuit 2 side is calculated. And a signal output unit 30 for outputting an operation signal in response to the operation value to the driving device M, and the operation amount of the driving device M and the opening degree of the second adjustment valve 32. The relationship between the opening degree of the second adjustment valve 32 is gradually increased as the operation amount of the driving device M increases, and the opening degree of the opening of the driving device M and the first adjustment valve 31 is increased. The relationship is constant opening until the operation amount of the driving device M reaches a predetermined value. Hot water supply control apparatus according to characterized in that the opening of the first control valve 31 is gradually increased in maintaining increased than road. By adjusting the combustion amount of the burner in response to the change in the amount of hot water discharged, a proportional control device is provided to keep the discharged hot water temperature at the hot water discharged set temperature, and bypasses the heat exchanger separately from the circuit to be heated through the heat exchanger. The pass circuit is provided, and the flow rate ratio adjusting device is provided at the branch of the heated circuit and the bypass circuit, and the flow rate ratio adjusting device is operated so that the heat exchanger outlet temperature of the heated circuit is maintained at a predetermined heating set temperature. In the hot water supply control device of the hot water supply device, the flow rate ratio adjusting device (3) provided in the branch portion of the bypass circuit (2) of the heating circuit (1) is operated by the drive device (M) to operate the heated circuit. The opening degree of the 1st adjustment valve 31 inserted in the (1) side and the 2nd adjustment valve 32 inserted in the bypass circuit 2 side is simultaneously controlled, and the said A water governor 4 for inserting the secondary pressure on the downstream side is inserted into the upstream side of the ratio adjusting device 3, and the outlet side of the heat exchanger 10 is maintained while the discharged hot water temperature is maintained at the set temperature. In order to maintain the hot water temperature at a constant temperature higher than the water supply temperature, the opening degree on the side of the heating circuit 1 calculates the ratio of the opening degree on the side of the bypass circuit 2, and responds to the calculated value. A signal output unit 30 for outputting an operation signal to the driving device M is provided, and the relationship between the operation amount of the driving device M and the opening degree of the second adjustment valve 32 is determined by the driving device ( The second adjustment valve 32 is closed until the operation amount of M) becomes the set operation amount from zero, and when the set operation amount is exceeded, the opening degree of the second adjustment valve 32 is gradually increased, Operating amount of the drive device M and opening of the first adjustment valve 31 The relationship is shown in the condition that the opening degree of the first regulating valve 31 becomes a constant flow rate when the operation amount of the drive device M is equal to or greater than the set operation amount, and the drive is performed within the range that is equal to or less than the set operation amount. Hot water supply control device, characterized in that the opening degree of the first adjustment valve (31) is gradually reduced as the amount of operation of the device (M) decreases.