Patent US3722523A successfully refreshed from Google Patents.
US3722523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas water heater
Assignee: Panasonic Holdings Corp
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Filing: 1970-10-14
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Granted: 1973-03-27
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Expires: 1990-10-14
Abstract
Abstract This invention relates to a gas water heater wherein a diaphragm for opening a gas valve utilizing the water flow is provided in the course of water supply passage to a heat exchanger, the low pressure chamber of said diaphragm is communicated with a low pressure Venturi portion formed by the aid of increasing the flow velocity in the water supply passage, and a control element is proceedably and recedably provided in the Venturi portion to automatically regulate the aperture of the Venturi portion corresponding to the variation of amount of water flow, intended for automation of water amount control and promoting the enlargement of range of adjusting water temperature and simplification of operation.
Inventors
- 👤 N Kawabata
- 👤 M Indo
- 👤 N Nishibayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:30
CPC Classifications
F; F23; F23N; F23N1/00; F23N1/08; F23N1/087; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2511; Y10T137/7722; Y10T137/7754; Y10T137/7781; Y10T137/7784; Y10T137/7787; Y10T137/7789; Y10T137/7792
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
282 words
A valve assembly for controlling the supply of water and gas to the heat exchanger portion of a gas water heater, comprising: a diaphragm operating chamber divided into a high pressure chamber portion and a low pressure chamber portion; a diaphragm disposed in said diaphragm operating chamber for separating said high pressure chamber portion from said low pressure chamber portion; gas control means connected to said diaphragm for controlling the supply of gas to said heat exchanger portion; governor means connected to said diaphragm for controlling the rate of flow of water into said valve assembly from a water supply inlet; water flow path means communicating said high pressure chamber portion with said heat exchanger portion, said flow path means comprising a Venturi portion having a constricted region, a first passageway connecting the input of said Venturi portion with said high pressure chamber portion, and a second passageway connecting the output of said Venturi portion with said heat exchanger portion; a further passageway, having a smaller cross-sectional area than said first passageway, connecting said Venturi portion with said low pressure chamber portion; a control member having a tapered portion at one end which protrudes into the constricted region of said Venturi portion and an opposite end portion acted on by the hydraulic pressure of water flowing through said water flow path means; means mounting said control member in said valve assembly independently of said diaphragm to be freely movable into and out of the constricted region of said Venturi portion; and biasing means resiliently urging said control member normally in a direction opposite to the direction of and against the pressure of the flow of water in said water flow path means.
Claim 2
Dependent Claim
282 words
A valve assembly for controlling the supply of water and gas to the heat exchanger portion of a gas water heater, comprising: a diaphragm operating chamber divided into a high pressure chamber portion and a low pressure chamber portion; a diaphragm disposed in said diaphragm operating chamber for separating said high pressure chamber portion from said low pressure chamber portion; gas control means connected to said diaphragm for controlling the supply of gas to said heat exchanger portion; governor means connected to said diaphragm for controlling the rate of flow of water into said valve assembly from a water supply inlet; water flow path means communicating said high pressure chamber portion with said heat exchanger portion, said flow path means comprising a Venturi portion having a constricted region, a first passageway connecting the input of said Venturi portion with said high pressure chamber portion, and a second passageway connecting the output of said Venturi portion with said heat exchanger portion; a further passageway, having a smaller cross-sectional area than said first passageway, connecting said Venturi portion with said low pressure chamber portion; a control member having a tapered portion at one end which protrudes into the constricted region of said Venturi portion and an opposite end portion acted on by the hydraulic pressure of water flowing through said water flow path means; means mounting said control member in said valve assembly independently of said diaphragm to be freely movable into and out of the constricted region of said Venturi portion; and biasing means resiliently urging said control member normally in a direction opposite to the direction of and against the pressure of the flow of water in said water flow path means.
Claim 3
Dependent Claim
20 words
A valve assembly according to claim 1, further comprising adjusting means for adjusting the biasing force of said biasing means.
Claim 4
Dependent Claim
38 words
A gas water heater as described in claim 1 characterized by forming a valve seat on water supply passage adjacent Venturi portion and integrating the valve portion cooperating with said valve seat and said control element opposing thereto.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |