Electronic proportioning valve
First Claim
Patent Images
1. A water delivery system for connection to a cold water source, a hot water source and a mixed water outlet, and for providing a mixed water of a desired water temperature to the mixed water outlet, the water delivery system comprising:
- a cold water valve adapted to be coupled to the cold water source for receiving cold water, and having a cold water outlet;
a hot water valve adapted to be coupled to the hot water source for receiving hot water, and having a hot water outlet;
a fluid mixer configured to receive cold water from the cold water outlet, to receive hot water from the hot water outlet, and to provide a mixed water to the mixed water outlet; and
a controller operably coupled to the cold water valve and the hot water valve, the controller being configured to adjust the cold water valve and the hot water valve to regulate a mixed water temperature of the mixed water to substantially correspond to the desired water temperature, the controller being further configured to regulate the mixed water temperature based on at least one characteristic of the cold water, at least one characteristic of the hot water, and at least one characteristic of the mixed water, wherein the controller operates alternatively in a feed forward manner and a feed back manner, the feed forward manner providing for the adjustment of the cold water valve and the hot water valve based on the at least one characteristic of the hot water and the at least one characteristic of the cold water, and the feed back manner providing for the adjustment of the cold water valve and the hot water valve based on the at least one characteristic of the mixed water, the controller operating in the feed forward manner when at least one of the cold water and the hot water is unstable.
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Abstract
An electronic proportioning valve for connection to a cold water source, a hot water source and a mixed water outlet and for providing a mixed water of a desired water temperature and flow rate to the mixed water outlet.
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Citations
27 Claims
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1. A water delivery system for connection to a cold water source, a hot water source and a mixed water outlet, and for providing a mixed water of a desired water temperature to the mixed water outlet, the water delivery system comprising:
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a cold water valve adapted to be coupled to the cold water source for receiving cold water, and having a cold water outlet; a hot water valve adapted to be coupled to the hot water source for receiving hot water, and having a hot water outlet; a fluid mixer configured to receive cold water from the cold water outlet, to receive hot water from the hot water outlet, and to provide a mixed water to the mixed water outlet; and a controller operably coupled to the cold water valve and the hot water valve, the controller being configured to adjust the cold water valve and the hot water valve to regulate a mixed water temperature of the mixed water to substantially correspond to the desired water temperature, the controller being further configured to regulate the mixed water temperature based on at least one characteristic of the cold water, at least one characteristic of the hot water, and at least one characteristic of the mixed water, wherein the controller operates alternatively in a feed forward manner and a feed back manner, the feed forward manner providing for the adjustment of the cold water valve and the hot water valve based on the at least one characteristic of the hot water and the at least one characteristic of the cold water, and the feed back manner providing for the adjustment of the cold water valve and the hot water valve based on the at least one characteristic of the mixed water, the controller operating in the feed forward manner when at least one of the cold water and the hot water is unstable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of controlling a water delivery system to provide a mixed water to a mixed water outlet, the water delivery system having a cold water valve connected to a cold water source, a hot water valve connected to a hot water source, and a mixer for combining cold water from the cold water valve and hot water from the hot water valve, the mixer being connected to the mixed water outlet, the method comprising the steps of:
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receiving an input representing a desired temperature of the mixed water being provided to the mixed water outlet; monitoring at least one characteristic of the cold water provided to the cold water valve, at least one characteristic of the hot water provided to the hot water valve, and at least one characteristic of the mixed water provided to the mixed water outlet; controlling the cold water valve and the hot water valve in a feed forward manner if at least one of the cold water and the hot water is unstable; and controlling the cold water valve and the hot water valve in a feed back manner only if both the cold water and the hot water are stable. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A water delivery system for connection to a cold water source, a hot water source and a mixed water outlet, and for providing a mixed water of a desired water temperature to the mixed water outlet, the water delivery system comprising:
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a cold water valve adapted to be coupled to the cold water source for receiving cold water, and having a cold water outlet; a cold water temperature sensor configured to measure the temperature of the cold water supplied to the cold water valve from the cold water source and to provide a cold water temperature signal indicative thereof; a cold water pressure sensor configured to measure the pressure of the cold water supplied to the cold water valve from the cold water source and to provide a cold water pressure signal indicative thereof; a hot water valve adapted to be coupled to the hot water source for receiving hot water, and having a hot water outlet; a hot water temperature sensor configured to measure the temperature of the hot water supplied to the hot water valve from the hot water source and to provide a hot water temperature signal indicative thereof; a hot water pressure sensor configured to measure the pressure of the hot water supplied to the hot water valve from the hot water source and provide a hot water pressure signal indicative thereof; a user input device configured to receive the desired temperature from the user and to provide a set temperature signal indicative of the desired temperature; and a controller operably coupled to the cold water temperature sensor, the cold water pressure sensor, the hot water temperature sensor, the hot water pressure sensor, the cold water valve and the hot water valve, the controller being configured to adjust the cold water valve and the hot water valve to regulate a mixed water temperature of the mixed water to substantially correspond to the desired water temperature by operating alternatively in a feed forward manner and a feed back manner, wherein the controller is configured to regulate the mixed water temperature in the feed forward manner by adjusting the cold water valve and the hot water valve in response to the cold water temperature signal, the cold water pressure signal, the hot water temperature signal, the hot water pressure signal, and the set temperature signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification