GB2076130A - Boiling water heater - Google Patents
Boiling water heater Download PDFInfo
- Publication number
- GB2076130A GB2076130A GB8012264A GB8012264A GB2076130A GB 2076130 A GB2076130 A GB 2076130A GB 8012264 A GB8012264 A GB 8012264A GB 8012264 A GB8012264 A GB 8012264A GB 2076130 A GB2076130 A GB 2076130A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tank
- water heater
- condenser tube
- boiling water
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 238000009835 boiling Methods 0.000 title claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 230000005611 electricity Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J31/00—Apparatus for making beverages
- A47J31/44—Parts or details or accessories of beverage-making apparatus
- A47J31/54—Water boiling vessels in beverage making machines
- A47J31/56—Water boiling vessels in beverage making machines having water-level controls; having temperature controls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/18—Water-storage heaters
- F24H1/20—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes
- F24H1/201—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes using electric energy supply
- F24H1/202—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes using electric energy supply with resistances
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/128—Preventing overheating
- F24H15/132—Preventing the operation of water heaters with low water levels, e.g. dry-firing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
- F24H15/223—Temperature of the water in the water storage tank
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/246—Water level
- F24H15/248—Water level of water storage tanks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/305—Control of valves
- F24H15/31—Control of valves of valves having only one inlet port and one outlet port, e.g. flow rate regulating valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/355—Control of heat-generating means in heaters
- F24H15/37—Control of heat-generating means in heaters of electric heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
- F24H9/2021—Storage heaters
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Food Science & Technology (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
A boiling water heater incorporating a tank 1 with an electrical heating element and water level control means actuable to maintain the water level in the tank within predetermined limits, wherein the supply of current to the element is controlled by the temperature in an inclined condenser tube 5 extending upwardly from the top of the tank. The condenser tube incorporates a steam exhaust flue 11, a temperature sensing bulb 8 and a cold water inlet 10. The supply of current is also controlled by a float comprising the water level control and the water supply is further controlled by the temperature sensing device. <IMAGE>
Description
SPECIFICATION
Boiling water heater
This invention relates to a boiling water heater and has been devised particularly but not solely for continuous supply of boiling water.
Water heaters of the type to which this invention relates have in the past not been entirely satisfactory in that when substantial quantities of water are removed from the vessel or the vessel is freshly filled from the empty condition, there is a substantial time lapse before hot or boiling water is available for use. An attempt has been made to provide a water heater which will provide continuous boiling water by using a temperature sensing control incorporated in a condenser on top of the heating tank but these systems have the disadvantage that the condenser is large, bulky and unsightly.
It is therefore an object of the present invention to provide a boiling water heater which will obviate or minimise the foregoing disadvantages in a simple yet effective manner or which will at least provide the public with a useful choice.
Accordingly the invention consists in a boiling water heater comprising a tank, a heating element within said tank, an outlet located near the bottom of said tank, an inclined condenser tube extending upwardly from a point at or near the top of the tank, a water supply pipe communicating with the interior of said condenser tube at a water inlet point intermediate the length thereof, a control valve in said water supply pipe, level control means actuable by the water level in said tank and arranged to operate said control valve to maintain the water level in said tank within predetermined limits, a substantially vertical flue extending upwardly from and communicating with the interior of said inclined condenser tube at a location above said water inlet point and temperature sensing means located within said inclined condenser tube and operable to control said heating element and the inflow of water through said water supply pipe in accordance with the temperature of steam in said condenser tube.
Notwithstanding any other forms that may fall within its scope one preferred form of the invention will now be described by way of example only with reference to the accompanying drawings in which:
Fig. 1 is a perspective view of a boiling water heater according to the invention having the casing thereof shown in broken outline and the tank thereof cut away to provide a view of the interior components, and
Fig. 2 is a vertical cross-section through the condenser tube of the boiling water heater shown in Fig. 1.
In the preferred form of the invention a boiling water heater is constructed as follows:
A tank 1 is provided which may for example be a rectangular metal tank which is provided with a heating element 2 and preferably an electric heating element having terminals 3. The heating element is located near the bottom of the tank. A hot water draw-off or outlet 4 is provided located slightly above the level of the heating element so that in use it is impossible to completely empty the tank and leave the heating element uncovered by water. The outlet may be coupled directly to a draw-off valve or tap or connected to a piping system.
The tank is provided with an inclined condenser tube 5 extending upwardly from a point 6 at or near the top of the tank and preferably from one corner from the tank as shown in Fig. 1.
The tube extends transversely upwardly and across the top of the tank. The tube which may typically comprise 3/4" copper pipe is provided with an end cap 7 which is threaded to the end of the tube and which is arranged to support a temperature sensing bulb 8. The temperature sensing bulb is preferably a liquid filled thermostat sensing bulb. The inclined condenser tube is connected to a water supply pipe 9 which communicates with the interior of the condenser tube at a water inlet point 10 which is located intermediate of the length of the condenser tube and which is preferably located slightly below the end of the temperature sensing bulb 8. The water supply pipe enters the condenser tube on the upper side of the tube. A vertical flue 11 is provided extending upwardly from and communicating with the interior of the inclined condenser tube at a location above the water inlet point 10.The vertical flue, which may for example comprise 1" diameter pipe, is open to the atmosphere at its upper end 12. To restrict the flow of steam which may issue from the flue a disc valve 13 is provided having a small central aperture 14. The disc valve sits loosely in the flue on a shoulder 1 5 so that should there be a sudden increase in steam pressure within the heating tank 1 and hence within the inclined condenser tube 5 the disc valve 13 is forced upwardly and tilted by the pressure of the steam to greatly increase the size of the opening and allow for relatively unimpeded egress of the steam.
The cold water supply pipe 9 is connected to a main supply pipe 16 from a cold water supply 1 7 through a solenoid operated control valve 1 8. The solenoid 1 9 of the control valve is connected by way of terminals 20 to the circuitry of the boiling water heater as will be described further later.
The water heater is provided with level control means in the form of a float 21 which is free to float on the surface of the water in the tank guided by a vertical float rod 22. The lower end of the rod is provided with a flange 23 and a clip 24 is secured to the rod adjacent to the upper end of the tank 1. The float rod passes through å guide bush 25 in the upper end of the tank above which is located a disc 26 which is secured to the float rod in an adjustable manner by way of mounting nuts 27. The disc 26 is arranged to operate two microswitches 28 and 29 as the float rod moves downwardly or upwardly respectively.
The level control means is arranged so that when the level of water in the tank drops until the weight of the float 21 is resting on the flange 23, the float rod is moved downwardly moving the disc 25 downwardly and operating the microswitch 28. When the tank is nearly full of water the upper surface of the float 21 abuts the clip 24 moving the float rod and the disc 26 upwardly and operating the microswitch 29.
The output from the temperature control bulb 8 is preferably monitored via condenser tube 30 to a thermostat 31 which is variable by way of control knob 32. The water inlet control valve solenoid 1 9, the microswitches 28 and 29 and the thermostat 31 are electrically interconnected to enable the water heater to operate as described below. It should be noted that thetthermostat and temperature sensing bulb can be one integral unit.
The tank of the water heater is provided with an overflow pipe 33 to enablewater to be harmlessly drained from the tank should there be some malfunction of the level control system.
The entire unit is mounted within a casing 34 shown in broken outline in Fig. 1. A layer of heat insulating material 35 is provided between the walls of the casing and the walls of the tank.
In use the cold water inlet pipe 1 6 is connected to a supply of cold water 17 and power is provided to the terminals 3 of the heating element through the control circuit of the heater. The control circuit of the heater opens the water inlet valve 1 8 and cuts the supply of electricity to the heating element 2 until sufficient water has entered the tank through the inclined condenser tube to lift the float 21 from the flange 23, operating the microswitch 28 and causing electricity to flow ta the heating element 2, and the water supply valve 1 8 to shut off the supply of cold water. The water in the tank is then heated until it reaches boiling point or approaches boiling point (regarded for the purposes of this description as "boiling water"), when the steam given off from the surface of the water will pass up the inclined condenser tube 5.
Once the temperature sensing bulb 8 senses that the water has reached boiling point by the temperature of the steam passing up the inclined condenser tube, the cold water inlet valve 1 8 is opened permitting a further quantity of water to enter the tank. The influx of cold water causes a drop in the temperature of the steam given off by the water in the tank which is sensed by the temperature sensing bulb 8 through the thermostat 31 which causes the water inlet valve 1 8 to close. This cycle is repeated until the level of water within the tank causes the float 21 to rise to the clip 24 and move the float rod 22 and disc 26
upwardly.The microswitch 29 is then operated by the disc 26 overriding the control of the thermostat 31 and causing the water inlet valve 1 8 to remain closed until the level of water in the
tank falls by water being drawn off through the
outlet 4 (or by evaporation).
Because cold water is only admitted in small
amounts until the temperature of the water in the tank is again elevated to boiling point the body of water within the tank is always maintained at or
near boiling point. Once the unit is in operation it
is therefore possible for a user to always draw off
boiling water from outlet 4. When water is drawn off the level of water in the tank falls causing the
microswitch 29 to again be operated by the float valve to allow the cold water inlet valve 1 8 to
open and admit more water.The cold water
entering the inclined condenser tube 5 just below the temperature sensing bulb 8 causes the temperature in the inclined condenser tube to
drop immediately which is sensed by the
temperature sensing bulb, operating the thermostat 31 and allowing power to be suppiied immediately to the heating element 2.
When the tank is full of water held at or near
boiling point it is an advantage of the arrangement
according to the invention that the condenser tube
5 is surrounded by air at ambient temperature which may be assisted by the provision of vents in the upper part of the casing 34. This allows the temperature in the condenser tube to fall fairly
quickly once power has been cut to the heating element 2 so that the temperature bulb 8 may quickly detect this fall in temperature and operate the thermostat 31 to again supply power to the
heating element.
In this manner a boiling water heater is provided which enables the virtually continuous supply of boiling hot water to be maintained in a simple yet safe manner and all control components to be contained within the casing.
Claims (9)
1. A boiling water heater comprising a tank, a heating element within said tank, an outlet located near the bottom of said tank, an inclined condenser tube extending upwardly from a point at or near the top of the tank, a water supply pipe communicating with the interior of said condenser tube at a water inlet point intermediate the length thereof, a control valve in said water supply pipe, level control means actuable by the water level in said tank and arranged to operate said control valve to maintain the water level in said tank within predetermined limits, a substantially vertical flue extending upwardly from and communicating with the interior of said inclined condenser tube at a location above said water inlet point, and temperature sensing means located within said inclined condenser tube and operable to control said heating element and said control valve in accordance with the temperature of steam in said condenser tube.
2. A boiling water heater as claimed in claim 1 wherein said temperature sensing means comprise a temperature sensing bulb located within said condenser tube and connected to an electrical thermostat.
3. A boiling water heater as claimed in either claim 1 or claim 2 wherein said level control means comprise a float valve arranged to operate a first electrical switch when the water level in said tank falls below a first predetermined level and a second electrical switch when the water level in said tank rises above a second predetermined level.
4. A boiling water heater as claimed in claim 3 wherein said electrical switches comprise microswitches.
5. A boiling water heater as claimed in claim 4 wherein said control valve in said water supply pipe comprises an electrically operable solenoid valve, electrically connected with said thermostat and said microswitches.
6. A boiling water heater as claimed in claim 2 wherein said water inlet point is located in the upper side of said inclined tube adjacent to and below the lower end of said thermostat bulb.
7. A boiling water heater as claimed in claim 1 wherein the upper end of said flue is provided with a disc valve having a central aperture therethrough arranged to allow the restricted egress of steam and wherein said disc valve is loosely mounted on shoulders in said flue so that the disc valve may be tilted by steam pressure within said flue to allow the rapid egress of steam from the upper end of said flue.
8. A boiling water heater as claimed in claim 1 wherein said inclined condenser tube is formed from 3/4" diameter pipe and said vertical flue is formed from 1" diameter pipe.
9. A boiling water heater when constructed, arranged and operable substantially as described herein with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8012264A GB2076130B (en) | 1980-04-14 | 1980-04-14 | Boiling water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8012264A GB2076130B (en) | 1980-04-14 | 1980-04-14 | Boiling water heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2076130A true GB2076130A (en) | 1981-11-25 |
| GB2076130B GB2076130B (en) | 1983-11-23 |
Family
ID=10512778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8012264A Expired GB2076130B (en) | 1980-04-14 | 1980-04-14 | Boiling water heater |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2076130B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2143625A (en) * | 1983-06-30 | 1985-02-13 | Still & Sons Ltd W M | Hot water dispenser |
| EP0139394A2 (en) * | 1983-08-24 | 1985-05-02 | Jackson Catering Equipment Limited | Self-feeding water-heating boiler |
| EP0139395A2 (en) * | 1983-08-24 | 1985-05-02 | Jackson Catering Equipment Limited | Improvements relating to water-heating boilers |
| EP0157884A1 (en) * | 1983-10-11 | 1985-10-16 | Matsushita Electric Industrial Co., Ltd. | Coffee maker |
| WO1991007624A1 (en) * | 1989-11-09 | 1991-05-30 | Heatrae Sadia Heating Limited | Heater for liquid |
| US5263116A (en) * | 1991-08-07 | 1993-11-16 | Heatrae Sadia Heating Limited | Heater for liquid |
| FR2718516A1 (en) * | 1994-04-06 | 1995-10-13 | Bunn O Matic Corp | Boiling water dispenser. |
| GB2308428B (en) * | 1994-10-17 | 1999-03-03 | Birko Australia Pty Limited | Water heater |
| EP2702909A1 (en) * | 2012-09-03 | 2014-03-05 | Melitta Europa GmbH & Co. KG | Device for generating hot water |
| CN107367058A (en) * | 2016-08-06 | 2017-11-21 | 青岛科技大学 | A kind of electric heater of temperature control hot water temperature |
-
1980
- 1980-04-14 GB GB8012264A patent/GB2076130B/en not_active Expired
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2143625A (en) * | 1983-06-30 | 1985-02-13 | Still & Sons Ltd W M | Hot water dispenser |
| EP0139394A3 (en) * | 1983-08-24 | 1986-11-12 | Jackson Catering Equipment Limited | Self-feeding water-heating boiler |
| EP0139394A2 (en) * | 1983-08-24 | 1985-05-02 | Jackson Catering Equipment Limited | Self-feeding water-heating boiler |
| EP0139395A2 (en) * | 1983-08-24 | 1985-05-02 | Jackson Catering Equipment Limited | Improvements relating to water-heating boilers |
| EP0139395A3 (en) * | 1983-08-24 | 1986-11-12 | Jackson Catering Equipment Limited | Improvements relating to water-heating boilers |
| EP0157884B1 (en) * | 1983-10-11 | 1991-01-30 | Matsushita Electric Industrial Co., Ltd. | Coffee maker |
| EP0157884A1 (en) * | 1983-10-11 | 1985-10-16 | Matsushita Electric Industrial Co., Ltd. | Coffee maker |
| WO1991007624A1 (en) * | 1989-11-09 | 1991-05-30 | Heatrae Sadia Heating Limited | Heater for liquid |
| GB2248103A (en) * | 1989-11-09 | 1992-03-25 | Heatrae Sadia Heating Ltd | Heater for liquid |
| GB2248103B (en) * | 1989-11-09 | 1993-11-10 | Heatrae Sadia Heating Ltd | Heater for liquid |
| US5263116A (en) * | 1991-08-07 | 1993-11-16 | Heatrae Sadia Heating Limited | Heater for liquid |
| FR2718516A1 (en) * | 1994-04-06 | 1995-10-13 | Bunn O Matic Corp | Boiling water dispenser. |
| GB2308428B (en) * | 1994-10-17 | 1999-03-03 | Birko Australia Pty Limited | Water heater |
| EP2702909A1 (en) * | 2012-09-03 | 2014-03-05 | Melitta Europa GmbH & Co. KG | Device for generating hot water |
| CN107367058A (en) * | 2016-08-06 | 2017-11-21 | 青岛科技大学 | A kind of electric heater of temperature control hot water temperature |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2076130B (en) | 1983-11-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930414 |