Water Vapor Seal for Meter Register Lens
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Solution Overview
Problem
Utility meter registers face challenges in providing effective sealing and assembly methods, especially in moist environments, with existing solutions like epoxy-based systems being costly and requiring improved vapor sealing and mechanical bonding.
Innovation Solution
The use of a hot melt butyl rubber sealant is applied in a channel around the perimeter of the instrument works, with preliminary heating of components to form a ring of sealant, and the lens is pressed into the sealant to create a vapor-tight seal, allowing for a lower-cost and more effective sealing solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an epoxy-based adhesive is used to join the glass lens portion to the metal base portion, then the vapor seal and mechanical bond are improved, but the manufacturing cost increases
Solution Approach 1:
The patent changes the physical state and temperature parameters of the sealant material. By heating the butyl rubber sealant to its melting point and then allowing it to cool and cure, the material transitions from a soft, moldable state to a hardened, sealed state. This parameter change enables a lower-cost material to achieve the same sealing performance as expensive epoxy adhesives.
Solution Approach 2:
The patent replaces expensive, permanent epoxy-based adhesives with a cheaper, thermally-processable butyl rubber sealant. The sealant is applied in a molten state, allows for assembly, and then cures to form a permanent seal. This substitution of a lower-cost material achieves the same functional result without the high manufacturing cost of epoxy systems.
2Ease of manufacture
If traditional gaskets are used for sealing between the glass portion and metal base portion, then the manufacturing cost is reduced, but the vapor seal performance deteriorates
Solution Approach 1:
The patent replaces the mechanical gasket system with a thermal sealing process. Instead of relying on a pre-formed gasket component that requires mechanical compression and assembly, the sealant is applied in a molten state, flows into the sealing channel, and bonds the lens to the base as it cools. This thermal-mechanical process eliminates the need for separate gasket components while achieving superior vapor sealing.
Solution Approach 2:
The patent uses a composite sealing system combining butyl rubber sealant with the metal base and glass lens. The butyl rubber provides the sealing function, while the metal base and glass lens provide structural support and transparency. This composite approach allows each material to contribute its optimal properties, achieving both low cost and high vapor seal performance.
3Ease of operation
If the lens and base are assembled at room temperature, then the assembly process is simplified, but the sealant bonding effectiveness deteriorates
Solution Approach 1:
The patent applies preliminary heating to the lens, base, and instrument works before assembly. This pre-heating ensures that when the molten sealant is applied, all components are at the optimal temperature for bonding. The preliminary thermal preparation enables the sealant to flow properly into the sealing channel and form strong bonds, which would not occur at room temperature.
Solution Approach 2:
The patent changes the temperature parameter of the assembly process from room temperature to elevated temperature (heating to at least approximately 180 degrees F., with the base reaching at least approximately 250 degrees F. in the channel). This parameter change enables the butyl rubber sealant to achieve its melting point, become moldable, and form effective bonds with the lens and base, creating a reliable mechanical bond that would not form at room temperature.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides a better vapor seal than traditional gaskets while reducing manufacturing costs and ensuring a reliable mechanical bond between the lens and base, even in extreme moisture conditions.
Implementation Method 1
The lens has a lower edge pressed into the body of sealant, which is a hot melt butyl rubber that has been cured within the channel
Implementation Method 2
maintaining a level of heating for the assembly of the instrument works and the base, such that the base is at a temperature of at least approximately 250 degrees F. in the channel; dispensing a heated body of sealant into the channel to form a ring of sealant
Implementation Method 3
heating the lens and the base to at least approximately 180 degrees F.; heating an instrument works to a temperature of at least approximately 140 degrees F.
Data Source
AI summary
A method and article of manufacture for providing a mechanical bond and an improved water vapor seal between a lens (11, 41) and a base (17, 47) in an instrument housing (10, 40), includes heating the components and a hot butyl rubber sealant (18, 58) prior to assembly, maintaining a level of heating for the assembly during assembly, dispensing the heated sealant (18, 58) into a channel (25, 65) to form a ring-shaped body of sealant (18, 58), assembling the lens (11, 41) to the base (17, 47) and pressing a lower edge (11a, 41a) of the lens (11, 41) into the ring of sealant (18, 58) and bending an upper edge (17b, 47b) of the side wall (17a, 47a) over a portion (11b, 41b) of the lens (11, 41). The method is applied in a second embodiment to an instrument having at least two signal conductors (55) entering the base (47) at two entry points. Apparatuses manufactured with the method are also disclosed.