JPH04167112A - Hot/cold water mixing device - Google Patents

Abstract

PURPOSE:To surely know the deterioration of a thermistor and to repair the thermistor before it has a serious fault by comparing the detected temperature data with each other after fully closing the hot water input side or the cold water input side and deciding the deterioration of the thermistor. CONSTITUTION:The input cold water temperature data received from an input cold water thermistor 23 are inputted together with the input hot water temperature data received from an input hot water thermistor 22 and the output hot water mixing temperature data received from a mixing temperature thermistor 24 respectively. Then it is decided that the resistance value is changed with deterioration of one of two thermistors. If the difference between the output hot water mixing temperature data and the input cold water temperature data is larger than the prescribed value when the hot water input side is fully closed, for example, the deterioration is decided for one or both of the thermistors 23 and 24. As a result, the change of the resistance value due to the deterioration of thermistors, etc., can be known and the due processing is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a hot water mixing device that adjusts the mixing ratio of hot water and water to obtain hot water at an appropriate temperature.

[Prior art]

Conventionally, a hot water layer valve body and a water valve body are provided on one shaft.
The shaft-type hot water mixing valve has a water valve seat that communicates with the water inlet,
A hot water valve seat communicating with the bottle inlet is opened to face the mixing chamber, and a water valve body that engages with the water valve seat and a hot water layer valve body that engages with the hot water valve seat. It is arranged on one valve stem.

One end of the valve shaft is pressed by a motor via a cam, etc., and the valve shaft is moved in the axial direction to adjust the opening degrees of the water valve body and the hot water valve body, and when lowering the hot water temperature. , the opening of the water valve element is increased and the opening of the hot water layer valve element is decreased to reduce the amount of hot water Q, while increasing the amount of water Q to lower the hot water temperature, and when raising the hot water temperature. In this case, the opening degree of the water valve element is made small and the opening degree of the hot water layer valve element is made large to increase the amount of hot water Q, while decreasing the amount of water Q to increase the hot water temperature.
Hot water at an appropriate temperature is obtained by adjusting the mixing ratio b (b - Qc / QN) of hot water and water.

In addition, an inlet thermistor is provided in the inlet channel from the water inlet to the water valve seat to detect the inlet water temperature T, and a hot water thermistor is provided in the inlet channel from the bottle inlet to the hot water layer valve seat to detect the inlet temperature T0. At the same time, a mixing temperature thermistor is provided in the outlet path from the mixing chamber to detect the outlet temperature TM.

In addition, there are some types in which only either a water entry thermistor or a hot water entry thermistor is installed.

[Problems to be Solved by the Invention] However, in the conventional hot water mixing device described above, it is possible to detect when a failure occurs due to an open or short circuit in the water inlet thermistor, hot water inlet thermistor, and mixing temperature thermistor. It is difficult to detect changes in the resistance value due to deterioration, etc. Therefore, when the thermistor deteriorates, there are problems such as an offset between the desired hot water tap temperature and the hot water tap temperature, and a deterioration of hot water tap characteristics. Ta.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hot water mixing device that can perform appropriate processing and always perform normal control by knowing changes in resistance value due to deterioration of a thermistor or the like.

[Means for Solving the Problems] In order to achieve the above object, the hot water mixing device of the present invention includes a water inlet thermistor, one or both of the hot water thermistor, and a mixing temperature thermistor, and includes a water inlet thermistor, a hot water inlet thermistor, or both, and a mixing temperature thermistor. In a hot water mixing device that controls the hot water output temperature by adjusting the hot water input amount Q8 and the water input amount Qc to adjust the mixing ratio of hot water and cold water, the temperature data detected by the mixing temperature thermistor with the hot water input side or the water input side fully closed. and the detected temperature data of the water entry thermistor or the hot water entry thermistor, and if the difference is larger than a predetermined value, it is assumed that one of the two thermistors for which the difference was found has changed in resistance value due to deterioration, etc. It is something to judge.

[Function] In the hot water mixing device of the present invention configured as described above, the incoming water temperature data TC from the incoming water thermistor, the incoming water temperature data T8 from the incoming water thermistor, and the outlet mixing temperature data T from the mixing temperature thermistor. is input, the hot water input side is fully closed (hot water input amount Q11 = 0), and the hot water output mixing temperature data TM and the water input temperature data T are input.
c, or completely close the water inlet side (water inlet amount QC-
As 〇), calculate the difference between the hot water outlet mixong temperature data T and the hot water input temperature data T8, and if the difference is larger than a predetermined value, the resistance value of one of the two thermistors for which the difference was calculated is due to deterioration etc. It is determined that a change has occurred.

For example, when the hot water input side is fully closed (hot water input amount QM=O), if the difference between the hot water output mixing temperature data T and the water input temperature data T is larger than a predetermined value, both the mixing temperature thermistor and the water input thermistor, or It is determined that a change in resistance value has occurred due to deterioration or the like on either side, and when the water inlet side is fully closed (inflow water amount Qc = 0), the difference between the outlet mixing temperature data T and the inlet water temperature data T is a predetermined value. If it is larger than , it is determined that a resistance value change has occurred in either or both of the mixing temperature thermistor and the hot water supply thermistor due to deterioration or the like.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

In FIG. 1, hot water flows from an inlet 1 through a check valve 2 into a pressure balancer 3, and from the pressure/N balancer 3 into a vortex flow path 4 of a hot water mixing valve 5.

Water flows from the water inlet 11 through the check valve 12 to the pressure balancer 3, and from the pressure balancer 3 to the water flow path 14 of the hot water mixing valve 5.
flows into.

The hot water mixing valve 5 is provided with a hot water layer valve seat 8 that communicates with the hot water flow path 4 and opens into the mixing chamber 9, and a water valve seat 18 that communicates with the water flow path 14 and opens into the mixing chamber 9. A connecting valve body 7 that engages with a hot water layer valve seat 8 mounted opposite to the valve stem 6 and a water valve body 17 that engages with a water valve seat 18 are installed in the mixing chamber 9. has been done.

The valve shaft 6 is moved in the axial direction through a cam, gears, etc. (not shown) by the rotation of the drive shaft of a stamping motor 10 installed outside the hot water mixing valve 5, and the hot water of the continuous valve body 7 is moved. Opening degree with respect to layer valve seat 8 and water valve seat 18 of water valve body 17
When the opening degree of the continuous valve body 7 becomes large, the opening degree of the water valve body 17 is made small; The opening degree is increased.

The hot water mixed in the mixing chamber 9 is driven by a flow rate sensor 20 and a stenoping motor 22, and is discharged to a shower or other hot water faucet via a flow rate regulating water stop valve 21.

In addition, a hot water supply thermistor 23 is provided in the hot water flow path 4 of the hot water mixing valve 5.
is installed to detect the hot water temperature data T and l, and
An inlet water thermistor 24 is installed in 4 to detect incoming water temperature data Tc, and a mixing temperature thermistor 25 is installed in the outlet side flow path of the mixing chamber 5 to detect outgoing hot water mixing temperature data, that is, current mixed hot water temperature data T. These temperature detection signals and detection signals from the flow rate sensor 20 are input to a controller (not shown), and the amount of operation of the stepping motor 10.22 is controlled by the output signal from the controller.

Here, the amount of hot water flowing into the mixing chamber 9, Q, is the total flow rate from the mixing chamber 9 detected by the hot water temperature data TH, the hot water temperature data T6, the currently tapping mixing temperature data TIl, and the flow rate sensor 20. From QT, QH-TH+ (QT-QM) Tc = QT ・
T.

Therefore, Q, l= ((Ts Tc)/(THTC) l
Since it becomes QT, the temperature data of the hot water mix song T, I,
The amount of hot water flowing into the mixing chamber 9 from the water heater Q can be calculated from the hot water temperature data T8, the hot water temperature data T, and the total flow rate Q.

Next, the control operation of the present invention will be explained with reference to the flowchart shown in FIG. 2. During a cold start, during hot water only dispensing mode, in which the hot water is dispensed as it is in order to obtain the highest temperature during dispensing, etc. When the water valve body 17 of the mixing device is fully closed and water is not injected, the difference between the outlet mixing temperature data T and the inlet water temperature data T11 is calculated, and its absolute value is set to a predetermined value. Compared with the first predetermined value T1, greater than the first predetermined value T1 < l T , 4
T, Il≧TI), it is assumed that the mixing temperature thermistor 25 or the hot water supply thermistor 23 has changed in resistance due to deterioration, etc., and a thermistor deterioration abnormality is displayed.

In addition, when the hot water layer valve body 7 of the mixing device is fully closed in the water only mode during hot water dispensing, and hot water is not being poured,
The difference between the outlet water mixong temperature data T8 and the inlet water temperature data Tc is calculated, and its absolute value is compared with a predetermined second predetermined value T2, and the absolute value of the difference is greater than the second predetermined value T2 (ITM - If TCI≧Tz), it is assumed that the mixing temperature thermistor 25 or the water entry thermistor 24 has changed in resistance due to deterioration or the like, and a thermistor deterioration abnormality is displayed.

Note that the first predetermined value T and the second predetermined value T2 may be equal or different values.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

Deterioration of the thermistor is determined by comparing the detected temperature data with the hot water inlet side or water inlet side fully closed.
It is possible to make frequent judgments, and it is possible to know with certainty whether the thermistor has deteriorated, and to repair it before it becomes a major failure.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a hot water mixing device to which the present invention is applied;
FIG. 2 is a flowchart of the control operation. 4... Hot water flow path, 6... Valve stem, 7... Hot water layer valve body, 8... Hot water layer valve seat, 9... Mixing chamber, 14... Water flow path, 17...・Water valve body, 18...Water valve seat, 21...
Flow rate adjustment water stop valve, 22... Hot water entry thermistor, 23... Water entry thermistor, 24... Hot water exit thermistor.

Claims (1)

[Claims] (1) It has a water inlet thermistor, a hot water inlet thermistor, or both and a mixing temperature thermistor, and controls the hot water output temperature by adjusting the amount of hot water flowing into the mixing chamber and the amount of incoming water to adjust the mixing ratio of hot water and water. In the hot water mixing device,
Compare the temperature data detected by the mixing temperature thermistor with the temperature data detected by the water inlet thermistor or hot water thermistor with the hot water inlet side or water inlet side fully closed, and if the difference is larger than a predetermined value, calculate the difference. A hot water mixing device characterized in that it is determined that a change in resistance value has occurred due to deterioration or the like in any one of the thermistors.