US3890936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot water generator for shock testing fabricated piping components
Assignee: Mark IV Transportation Products Corp
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Filing: 1974-01-28
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Granted: 1975-06-24
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Expires: 1994-01-28
Abstract
Abstract A hot water generator capable of producing a maximum rate of water temperature increase without generation of vapors including a heat exchanger in the form of an annularly shaped helical coil through which the water to be heated is pumped and which is connected to a piping system including a load and a combustor for rapidly providing increased combustion which is controlled in response to the temperature of the water at the outlet of the coil so that the heater can produce a maximum rate of water temperature rise without causing boiling and generating vapors in the coil. The method concerns the shock testing of piping components by producing nearly theoretical maximum heat flux rate very quickly.
Inventors
- 👤 Michael J Mcinerney
- 👤 Robert T Brady
- 👤 Alvia E Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:50
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/22; F24H1/40; F24H1/43; F24H1/10; F24H1/12; F24H1/14; F24H1/16; F24H1/165
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
365 words
A hot water generator having a high turndown ratio for rapidly increasing the temperature of hot water to a point of substantially theoretical maximum heat absorption and temperature rise without nucleation, said generator comprising a housing defining connected substantially cylindrical coil and combustor sections, an annularly shaped helical coil axially aligned in the coil section having a plurality of longitudinally arranged rows and radially arranged layers of watertubes with an open central area for receiving combustion gases and defining a water flow path, an inlet at the outermost layer of said watertubes, an outlet at the innermost layer of said watertubes, pipinG outside the generator connected between the inlet and outlet of the coil to define therewith a continuous closed loop water flow path, a load in the piping, a pump in the piping causing a constant water flow in the flow path such that the pressure maintained will limit the water temperature to just below the nucleate boiling point, a flue gas outlet in the coil section outward of the coil, a fuel and air induction system including a fossil fuel burner delivering fuel to the combustor section and a blower for producing and delivering combustion air to the combustor section, a fuel line having a fuel metering valve therein connected to the burner, a duct connecting the blower to the combustor section and having a damper for controlling combustion air, a combustion air bleed line ahead of the damper for continually bleeding a small amount of air directly into the fuel line downstream of the valve to maintain combustion stability at low fire, a choke in the housing between the combustor section and the coil section directing combustion gases from the combustor section to the central area of the coil, a fast response air-fuel actuator connected to the fuel valve and air damper for quickly providing the necessary air fuel supply, and control means operating said actuator in response to a set point temperature input and the input of a temperature measuring device at the outlet of said coil to control fuel and air flow change from low fire to high fire and produce a maximum rate of water temperature increase without nucleation.
Claim 2
Dependent Claim
365 words
A hot water generator having a high turndown ratio for rapidly increasing the temperature of hot water to a point of substantially theoretical maximum heat absorption and temperature rise without nucleation, said generator comprising a housing defining connected substantially cylindrical coil and combustor sections, an annularly shaped helical coil axially aligned in the coil section having a plurality of longitudinally arranged rows and radially arranged layers of watertubes with an open central area for receiving combustion gases and defining a water flow path, an inlet at the outermost layer of said watertubes, an outlet at the innermost layer of said watertubes, pipinG outside the generator connected between the inlet and outlet of the coil to define therewith a continuous closed loop water flow path, a load in the piping, a pump in the piping causing a constant water flow in the flow path such that the pressure maintained will limit the water temperature to just below the nucleate boiling point, a flue gas outlet in the coil section outward of the coil, a fuel and air induction system including a fossil fuel burner delivering fuel to the combustor section and a blower for producing and delivering combustion air to the combustor section, a fuel line having a fuel metering valve therein connected to the burner, a duct connecting the blower to the combustor section and having a damper for controlling combustion air, a combustion air bleed line ahead of the damper for continually bleeding a small amount of air directly into the fuel line downstream of the valve to maintain combustion stability at low fire, a choke in the housing between the combustor section and the coil section directing combustion gases from the combustor section to the central area of the coil, a fast response air-fuel actuator connected to the fuel valve and air damper for quickly providing the necessary air fuel supply, and control means operating said actuator in response to a set point temperature input and the input of a temperature measuring device at the outlet of said coil to control fuel and air flow change from low fire to high fire and produce a maximum rate of water temperature increase without nucleation.
Claim 3
Dependent Claim
18 words
A hot water generator as defined in claim 1, wherein the turndown ratio is about 24 to 1.
Claim 4
Dependent Claim
15 words
A hot water generator as defined in claim 2, wherein the fuel is natural gas.
Claim 5
Dependent Claim
25 words
A hot water generator as defined in claim 2, wherein a peak water temperature at the coil output is attained in less than one minute.
Claim 6
Dependent Claim
244 words
A hot water generator having a high turndown ratio for rapidly increasing the temperature of hot water to a point of substantially theoretical maximum heat absorption and temperature rise without nucleation, said generator comprising a housing defining connected substantially cylindrical coil and combustor sections, an annularly shaped helical coil in the coil section with an open central area for receiving combustion gases and defining a water flow path, an inlet and an outlet for said coil, piping connected between the inlet and outlet and including a load in the form of a heat exchanger defining a closed loop water path, a pump in the piping forcing constant water circulation through the closed loop, a fuel and air induction system including fuel and air controls coacting to deliver the proper mixture of fuel and air to the combustor section, said fuel and air induction system including a fuel line delivering fuel to the combustor section, a combustion air line delivering combustion air to the combustor section, and means continually bleeding air directly into the fuel line to maintain stable combustion in the combustor section at minimum fire conditions, a fast response actuator for said fuel and air controls, and a temperature controller providing operating signals to the actuator in response to a set point temperature and the water temperature at the coil outlet to operate the fuel and air controls and cause a rapid rate of temperature rise in the outlet water temperature without nucleation.
Claim 7
Dependent Claim
244 words
A hot water generator having a high turndown ratio for rapidly increasing the temperature of hot water to a point of substantially theoretical maximum heat absorption and temperature rise without nucleation, said generator comprising a housing defining connected substantially cylindrical coil and combustor sections, an annularly shaped helical coil in the coil section with an open central area for receiving combustion gases and defining a water flow path, an inlet and an outlet for said coil, piping connected between the inlet and outlet and including a load in the form of a heat exchanger defining a closed loop water path, a pump in the piping forcing constant water circulation through the closed loop, a fuel and air induction system including fuel and air controls coacting to deliver the proper mixture of fuel and air to the combustor section, said fuel and air induction system including a fuel line delivering fuel to the combustor section, a combustion air line delivering combustion air to the combustor section, and means continually bleeding air directly into the fuel line to maintain stable combustion in the combustor section at minimum fire conditions, a fast response actuator for said fuel and air controls, and a temperature controller providing operating signals to the actuator in response to a set point temperature and the water temperature at the coil outlet to operate the fuel and air controls and cause a rapid rate of temperature rise in the outlet water temperature without nucleation.
Claim 8
Dependent Claim
18 words
A hot water generator as defined in claim 5, wherein the turndown ratio is about 24 to 1.
Claim 9
Dependent Claim
24 words
A hot water generator as defined in claim 6, wherein the fuel and air induction system includes a fossil fuel burner and a blower.
Claim 10
Dependent Claim
211 words
In a hot water generator having a housing defining connected substantially cylindrical coil and combustor sections, an annularly shaped helical coil axially aligned in the coil section with an open central area for receiving combustion gases and defining a water flow path, an inlet and an outlet for said coil, piping outside the generator connected between the inlet and oUtlet of the coil to define therewith a continuous closed loop water flow path, a load in the piping, a pump in the piping causing a constant water flow in the flow path, a fuel and air induction system including a fuel burner delivering fuel to the combustor section and a blower for producing and delivering combustion air to the combustor section, a fuel line having a fuel metering valve therein and connected to the burner to deliver fuel thereto, a duct connecting the blower to the combustor section and having means therein for controlling the amount of combustion air to the combustor section, the improvement in means for maintaining stable combustion in the combustor section at minimum air-fuel openings comprising a combustion air bleed line ahead of the combustion air controlling means for continually bleeding a small amount of air directly into the fuel line downstream of the fuel metering valve.
Claim 11
Dependent Claim
211 words
In a hot water generator having a housing defining connected substantially cylindrical coil and combustor sections, an annularly shaped helical coil axially aligned in the coil section with an open central area for receiving combustion gases and defining a water flow path, an inlet and an outlet for said coil, piping outside the generator connected between the inlet and oUtlet of the coil to define therewith a continuous closed loop water flow path, a load in the piping, a pump in the piping causing a constant water flow in the flow path, a fuel and air induction system including a fuel burner delivering fuel to the combustor section and a blower for producing and delivering combustion air to the combustor section, a fuel line having a fuel metering valve therein and connected to the burner to deliver fuel thereto, a duct connecting the blower to the combustor section and having means therein for controlling the amount of combustion air to the combustor section, the improvement in means for maintaining stable combustion in the combustor section at minimum air-fuel openings comprising a combustion air bleed line ahead of the combustion air controlling means for continually bleeding a small amount of air directly into the fuel line downstream of the fuel metering valve.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |