Patent Application
20180038615
The present invention relates to a switch; and more particularly to a switch for providing a low water cut-off (LWCO), e.g., for a burner or other hot water/liquid heating device.
Low water safety controls are used in the boiler industry to protect a boiler from a dry fire. These controls have single pole double throw (SPDT) contacts to operate the burner and alarm/water feeder. When the water level is normal, the circuit remains closed; and when the water level falls below the desired level, the circuit opens. When in an open state, the circuit connects to the water feeder/alarm, and when in a closed state the circuit connects to the burner. The opening and closing of the circuit depends on the mode of operation of the low water safety controls. The two modes of operation are as follows.
A low water cut-off (LWCO) circuit will open and close based on the water level. When the level of water falls below the desired level, the circuit opens and activates the water feeder which in turn restores the water in the boiler. As soon as the water level is restored, the circuit automatically closes and activates the burner. In the automatic mode, the circuit operates without any manual intervention.
In the manual mode, the circuit will be closed when the level of the water is normal and latches open when the level of water is low. Pressing the manual reset button unlatches the mechanism and allows the circuit to open and close based on the water level. When the water level is restored, the reset button integrated with the low water safety controls needs to be pressed in order to close the circuit. This method of operation meets the requirement of ASME standard CSD-1, wherein when there is an interruption of power, if the LWCO is in a low water condition, it will remain to be in a low water condition even after power is restored.
High water manual mode operates opposite to the standard manual safety controls. For example, it closes the circuit when the level of water is below the high water condition and latches open in a high water condition. Pressing the manual reset button unlatches the mechanism and allows circuit to open and close based on the water level. The reset button integrated with the low water safety control has to be pressed when the water level falls below the high level water condition in order to close the circuit.
These automatic and manual models are used in two types of application in boiler industries - Steam and Hot Water applications. A boiler operates on two different input voltages: 120V and 24V. Some boilers require 120V while other requires 24V to operate. Since multiple combinations are possible, currently one needs to manufacture multiple combinations of low water cut-off switch models for use in the boiler industry.
In particular, for a single voltage application, e.g., 120V or 24V, five (5) different types of low water cut-off switch models need to be manufactured as shown in the table in
In summary, the present invention provides a new and unique concept, in which a system or controller (e.g., such as a low water cutoff switch controller) may be configured or set to any one of the modes, e.g., mentioned in the table in
Each application type or mode has its dedicated DIP switch and LED. Initially, the system or controller is not configured to any of these types or modes. On selection of any one of the DIP switches and on pressing a test/reset button, e.g. for some duration of time like 10 seconds, the controls will be configured to the selected mode. Upon selection, a respective LED will glow to indicate the selected mode. Once the system or controller is configured or set, the DIP switch functionality will be locked and any further change to the switch settings will not affect its operation.
Such a unique field configurable solution of a LWCO switch will help reduce the inventory maintained by manufacturers and distributors. Contractors/Distributors will no longer be required to order for a particular controller, and no longer be required to carry different types of controls or controller to the field based on the application (primary/secondary, automatic/manual). The present invention also allows for ease of configuration of the LWCO switch in the field itself depending on the application.
In addition, the LWCO switch may include one dual colour (Green/Yellow) LED. This LED has multiple functions, e.g., including
The present invention provides a solution to the problem in the art by reducing the high manufacturing and inventory control cost, reducing the number of models, enabling ease of manufacturing and maintaining optimum inventory and stock,. In effect, this new design will optimize the number of models for a single voltage application to one (1) model.
By way of example, the present invention features a new and unique low water cutoff switch controller featuring: dual inline package (DIP) in combination with a low water cutoff switch processor.
The dual inline package (DIP) may include DIP switches. Each DIP switch may be configured to set in a respective application type or mode corresponding to a particular water heater model for the low water cutoff switch controller to control, and also be configured to provide DIP switch signaling containing information about a respective DIP switch set, e.g., by a field operator.
The low water cutoff switch processor may be configured to:
The low water cutoff switch controller according to the present invention is a single controller that can be used for controlling any one of a plurality of different water heater models and have different voltage applications by setting a respective one of the DIP switches.
The low water cutoff switch controller may also include one or more of the following features:
The low water cutoff switch controller may include a test/manual reset common switch configured to respond to a pressing force applied for a duration of time, and provide test/manual reset common switch signaling; and the low water cutoff switch processor configured to respond to the test/manual reset common switch signaling, and set the low water cutoff switch controller for operating in the respective application type or mode corresponding to the particular water heater model.
The low water cutoff switch processor may be configured to set the low water cutoff switch controller for operating in the respective application type or mode corresponding to the particular water heater model one time and does not allow the respective application type or mode corresponding to the particular water heater model to be changed. For example, a field operator cannot try to reuse and/or reset the DIP to a different setting at a later time and try to use it for a different particular water heater model.
The dual inline package (DIP) may include dedicated DIP switches that can be set to application types or modes, as follows:
The low water cutoff switch processor may also be configured to provide LED control signaling. The low water cutoff switch controller may include an LED module having LEDs corresponding to application types or modes; and the LED module may be configured to respond to the LED control signaling, and provide an LED indication of one of the application types or modes selected.
The LED module may include dual colour LEDs having a green LED for lighting to indicate an auto/power mode, a yellow LED for lighting to indicate a manual/power mode, and a red LED for lighting to indicate a control status mode.
The low water cutoff switch controller may include a relay module configured to respond to the control signaling, and provide relay signaling containing information to control the operation of the particular water heater model. By way of example, the relay signaling may include NC—burner contact signaling, no—WF contact signaling and/or com signaling, e.g., containing information to control the operation of the particular water heater model for implementing the respective relay signaling functionality, e.g., consistent with that set forth herein.
The dual inline package (DIP) may include DIP LEDs, each DIP LED corresponding to a respective one of the DIP switches for providing a respective LED indication when the respective one of the DIP switches is selected.
The low water cutoff switch processor may be configured to respond to the test/manual reset common switch signaling, and lock the low water cutoff switch controller so that any further change to the DIP switches will not effect the operation of the low water cutoff switch controller.
The plurality of different water heater models include 24V or 120V applications.
The drawing includes the following Figures, not necessarily drawn to scale, including:
In the Figures, similar parts are labeled with similar reference numerals. Moreover, not every part is labelled with a reference numeral and lead line in every Figure, so as to reduce clutter in the drawing.
The dual inline package (DIP) 14 may include DIP switches labeled 1, 2, 3, 4, 5 as shown in
The low water cutoff switch processor 14 may be configured to:
By way of example, the hot water or boiler application 11 may include a water level sensor and controller, where the water level sensor is configured to sense the water level in the hot water or boiler application 11, and provide the corresponding signal, and where the controller is configured to receive the control signaling from the low water cutoff switch controller and control the hot water or boiler application 11, e.g., consistent with that set forth herein and that known in the art. Water level sensor and controller for hot water or boiler applications like element 11 are known in the art; and the scope of the invention is not intended to be limited to the type or kind thereof, either now known or later developed in the future.
The low water cutoff switch controller 10 may include a test/manual reset common switch 16 configured to respond to a pressing force, e.g., applied for a duration of time like 10 seconds, and provide test/manual reset common switch signaling along line 16a. The low water cutoff switch processor 14 may be configured to respond to the test/manual reset common switch signaling along line 16a, and set the low water cutoff switch controller 10 for operating in the respective application type or mode corresponding to the particular water heater model. By way of example, and according to some embodiments, the low water cutoff switch processor 14 may also be configured to set the low water cutoff switch controller 10 for operating in the respective application type or mode corresponding to the particular water heater model one time and does not allow the respective application type or mode corresponding to the particular water heater model to be changed. The scope of the invention is also intended to include other types or kinds of test/manual reset procedures, e.g., to ensure that the hot water or boiler application 11 is operated safely and in compliance with any particular building codes, rules or regulations applicable to the hot water application.
By way of example, and according to some embodiments, the dual inline package (DIP) 12 may include dedicated DIP switches that can be set to application types or modes, as follows:
The scope of the invention is also intended to include other types or kinds of modes of operation and applications, e.g., either now known or later developed in the future.
The low water cutoff switch processor 14 may also be configured to provide LED control signaling along lines 14a. The low water cutoff switch controller may include an LED module 18 having LEDs, e.g., indicated by the designations “green”, “yellow” and “red,” corresponding to application types or modes. The LED module 18 may be configured to respond to the LED control signaling along lines 14a, and provide an LED indication of one of the application types or modes selected. By way of example, the LED module 18 may include dual colour LEDs having a green LED for lighting to indicate an auto/power mode, a yellow LED for lighting to indicate a manual/power mode, and a red LED for lighting to indicate a control status mode.
The low water cutoff switch controller 10 may include a relay module 20 configured to respond to the control signaling along line 14b, and provide relay signaling along lines 20a, 20b, 20c containing information to control the operation of the particular water heater model, e.g., such as the hot water application 11. By way of example, the relay signaling may include NC—burner contact signaling, no—WF contact signaling and/or com signaling, e.g., containing information to control the operation of the particular water heater model. The relay signaling along lines 20a, 20b, 20c may be provided as the control signaling to control the hot water application 11.
By way of example, the dual inline package (DIP) 12 may include DIP LEDs labeled a, b, c, d, e. Each DIP LED corresponds to a respective one of the DIP switches 1, 2, 3, 4, 5 for providing a respective LED indication when the respective one of the DIP switches is selected or set, e.g., by the field operator.
The low water cutoff switch processor 14 may be configured to respond to the test/manual reset common switch signaling along line 16a, and lock the low water cutoff switch controller 10 so that any further change to the DIP switches 1, 2, 3, 4, 5 will not effect the operation of the low water cutoff switch controller 10.
By way of example, the functionality of the low cut off switch processor 14 may be implemented using hardware, software, firmware, or a combination thereof. In a typical software implementation, the processor 14 would include one or more microprocessor-based architectures having, e.g., at least one signal processor or microprocessor. A person skilled in the art would be able to program such a microcontroller (or microprocessor)-based implementation to perform the functionality described herein without undue experimentation. The scope of the invention is not intended to be limited to any particular implementation using technology either now known or later developed in the future. The scope of the invention is intended to include implementing the functionality of the processor 14a as stand-alone processor or processor module, as separate processor or processor modules, as well as some combination thereof.
By way of example, one skilled in the art would appreciate and understand how to implement the functionality of the low cut off switch processor 14 without undue experimentation, e.g., to respond to DIP switch signaling containing information about a respective DIP switch set, and also respond to corresponding signaling containing information about a sensed water level contained in the particular water heater model being controlled by the low water cutoff switch controller, and provide control signaling containing information to control the operation of the particular water heater model.
As one skilled in the art would also appreciate and understand, the low cut off switch processor 14 may also include other signal processor circuits or components, e.g. including random access memory (RAM) and/or read only memory (ROM), input/output devices and control, and data and address buses connecting the same, and/or at least one input processor and at least one output processor.
The other components in the low cut off switch controller 10 are known in the art, including the DIP 12, the test/manual reset common switch 16, the LED module 18, and the relay 20. The scope of the invention is not intended to be limited to any particular type or kind of such components. Moreover, one skilled in the art would be able to implement the underlying functionality without undue experimentation, e.g., consistent with that disclosed herein.
It should be understood that, unless stated otherwise herein, any of the features, characteristics, alternatives or modifications described regarding a particular embodiment herein may also be applied, used, or incorporated with any other embodiment described herein. Also, the drawing herein is not drawn to scale.
Although the invention has been described and illustrated with respect to exemplary embodiments thereof, the foregoing and various other additions and omissions may be made therein and thereto without departing from the spirit and scope of the present invention.
This application claims benefit to provisional patent application serial no. 62/348,271, filed 10 Jun. 2016, which is hereby incorporated by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| 62348271 | Jun 2016 | US |
