BR102013000487A2 - Fast Recovery Type Passage Water Heater - Google Patents

Abstract

Fast recovery type through water heater. The rapid recovery bypass water heater of the present invention works by card or electronic controller, eliminating the need for electromechanical water flow detector. This electronic controller manages the operation of each of the components of the system optimizing the fuel gas consumption and minimizing the emission of contaminating gases, since it does not have pilot and the multibody burner lights only when certain conditions or requirements pre-established in the logic of the electronic controller that stays off most of the time. Other factors that contribute to improving the efficiency of the water heater are: the design of the water tank which at its bottom comprises a water chamber surrounding the combustion chamber, minimizing thermal losses in this zone and the use of a heat exchanger. It is branched that in combination with a core, most of the thermal energy contained in the flue gas is used. Another feature of the present invention is an air deflector device which prevents air currents from entering the upper part of the heater, thereby preventing possible flame setbacks, and extinguishing the flame in the multi-body burner.

Description

Report of the Invention Patent QUICK TYPE PASSWATER HEATER

RECOVERY

Field of the Invention The present invention generally relates to water heating equipment that maximizes its efficiency by reducing thermal losses by using a branched type heat exchanger and a water chamber surrounding the combustion chamber. . This water heater is capable of permanently providing a hot water supply and has an electronic control system that manages its operation.

BACKGROUND OF THE INVENTION In order to satisfy a constant demand for hot water with the highest possible fuel gas economy, the instantaneous or fast-recovering bypass water heaters are currently on the market. In the case of the former, however, there is the problem that they must comply with a minimum hydraulic operating pressure; In addition, in regions where the ambient temperature may be below zero degrees Celsius, the water contained in the coil of this type of heater may freeze and its volumetric expansion causes the coil to rupture and consequently render the equipment unusable. PCT patent WO / 2007/057864 offers an alternative to solve the problem of freezing water in this type of heater, however, it still does not solve the problem of minimum hydraulic operating pressure, so instant type heaters remain inadequate. for use in most existing hydraulic installations, in many cases forcing the need to adapt or integrate other elements into the system for their proper operation, increasing the cost of equipment.

Due to the fact that the pressure is not constant in the hydraulic installations, there is a need to create a water heater as described in the previous paragraph seeking a fuel gas economy, and that is suitable for the various hydraulic installations to meet a demand. constant hot water.

The equipment mentioned in US patents US 7,982,164 B2 and US 7,985,943 B2, because they are non-instantaneous, quick-recovery type pass-throughs, do not require minimum hydraulic operating pressure for their proper operation. However, the heaters described in both patents make use of an electromechanical flow detector to send the hot water demand signal to an electronic controller. This flow detector has a nucleation point for sediment precipitation, so if it is used in regions where water from the mains contains high saline concentration, the operation of the flow detector could be affected by changing the operation of the equipment. .

The water heater of the present invention eliminates the need for an electromechanical water flow detector and is replaced by a system composed of two temperature sensors placed at the cold water inlet and the other at the water outlet. in such a way as to allow us to deduce that the flow condition is displayed by recording a 4 ° C difference between the two temperature sensors. This water heater has an ionized ignition system and an electronic controller that sends the ignition order under the following conditions: a) When there is a flow signal and the temperature sensor at the outlet of the hot water detects a temperature lower than the predetermined maximum cutting temperature on the electronic controller. b) It will also be switched on when the temperature detected by both sensors is lower than a preset value in the electronic controller as the minimum ignition temperature.

In this way the water heater will only be lit when hot water is required by the settings entered in the electronic controller.

SUMMARY OF THE INVENTION The water heater of the present invention has been designed in such a way as to have the following elements: A corrosion resistant water tank which at its bottom extends long enough to form a water chamber surrounding the water chamber. combustion located on a multibody burner so that heat loss to the outside of this region is minimized, and at its top has a branched type heat exchanger, allowing the capture of most of the thermal energy contained in the gases from combustion and transfer to the water contained in the tank; a burner with a power output between 8.7 and 13.0 kW where fuel gas is supplied from a solenoid valve system, a bimetallic temperature detector whose function is to prevent water overheating inside the equipment; two temperature sensors respectively located at the cold water inlet and hot water outlet, a first electrode that generates a spark to the burner flame and a second electrode that detects the change in current produced on the first electrode by ionization after ignition of the burner; an electronic controller which, when meeting the hot water demand conditions and / or a heater water temperature lower than the pre-set, sends a current to the first electrode in such a way as to generate a burner spark; a system of solenoid valves that allow the gas to pass safely to the burner once the electronic controller has sent the current to generate the spark on the first electrode; a direct communication screen with the electronic controller where the user can observe the state of the water heater at a given time.

The entire assembly of components of the present invention makes the water heater operate by privileging the safety of the user and the water heater itself and maximizing fuel gas economy without a permanently lit pilot.

Brief Description of the Figures Figure 1 is an overview of the water heater of the present invention. Figure 2 shows the main components, which are: water tank, drain valve, outer body, solenoid valve system, electronic controller and air dispensing device, through an explosion view. Figure 3 is a cross-sectional view of the top of the heater. Figure 4 is a cross-sectional view of the bottom of the heater. Figure 5 is a view of the card or electronic controller.

Detailed Description of the Invention The water heater (1) of the present invention illustrated in Figure 1 is designed to withstand a pressure greater than 1.0 MPa. The water tank (2) is made of steel and the areas in contact with the water are porcelain coated to prevent corrosion. The cold inlet (3) is located in the upper right part of the water tank (2), in the same way the hot water outlet (4) is located in the upper left part of such a tank (2). Additionally at the bottom of the water tank (2) there is a connection (5) which communicates the water tank (2) with the outside, so that the water tank (2) can be drained and cleaned by placing of a valve (6). Fuel gas is supplied to a multibody burner (7) by means of a solenoid valve system (8), thereby providing the energy required for water heating. The power of the multibody burner (7) will depend on the size of the equipment, which in turn will depend on the user's needs. The multibody burner (7) and solenoid valve system (8) regulate the gas flow safely. This solenoid valve system (8) is protected from thermal radiation by means of a divider (9). The solenoid valve system (8) connects to the multibody burner (7) so that fuel gas transfer between both components is possible. The solenoid valve system is normally closed until the electronic controller (10) sends the opening signal when the following conditions of hot water demand and / or water temperature are met. a) When there is a flow signal and the temperature sensor placed at the hot water outlet (12) detects a temperature lower than the predetermined maximum cut-off temperature in the electronic controller (10); or (b) when the temperature detected by both temperature sensors (11) and (12) is less than a preset value in the electronic controller as the minimum heating temperature. The electronic controller (10) sends the signal to close the solenoid valve system (8) preventing the passage of combustible gas to the burner when both conditions mentioned above are not met.

The temperature sensors placed at the cold water inlet (11) and the hot water outlet (12) are inserted into a brass, bronze or other corrosion resistant material connection, and these, in turn, are mounted in the storage tank. water at the cold water inlet and the hot water outlet respectively.

The two cables that make up each of the temperature sensors (11) and (12) must be in contact with each other at the inside end of the water tank, the opposite end connects to the electronic controller (10) just like in the system. of fuel gas supply solenoid valves (8). Next to the temperature sensor at the hot water outlet (12) is a bimetallic safety device (13), which will work if there is overheating in the tank water (2) interrupting the current flow to the electronic controller (10). This bimetallic safety device allows system operation to be suspended if the water temperature exceeds a predetermined value. Thanks to their configuration, temperature sensors (11) and (12) allow the electronic controller (10) to identify the water demand condition by presenting a 4 ° C difference between such temperature sensors (11) and (12). ). Therefore (Therefore), the water heater (1) will restart its operation only when the temperature in the bimetallic safety device (13) is lower by, for example, 4 ° C with respect to the specific safety temperature. The electronic controller (10) manages the operation of the different components forming the water heater, then, upon receiving a temperature difference signal greater than, for example, 4 ° C, between the hot water outlet temperature sensor ( 12) (Ts) and the cold water inlet temperature sensor (11) (Te) (Ts-Te> 4 ° C) sends a direct current signal to the ignition electrode (14) shown in Figure 4 to generate the electric spark that ignites the multibody burner (7). The ignition electrode (14) is placed at a distance of not more than 4 mm above one of the bodies that make up the multibody burner (7). After 3 seconds and with the electric spark in operation, the electronic controller (10) sends a signal to the solenoid valve system (8) for the sequential opening of the solenoid valves that make up the system in question (8) so that a fuel gas for the multibody burner (7). Once the multibody burner (7) is lit, the ionization electrode (15) (shown in Figure 4), placed no more than 4 mm above one of the multibody burner bodies (7), will detect the calls through an ionization process and will send the signal to the electronic controller (10).

If the flame signal is not received by the electronic controller (10) within 5 seconds, or if the signal flashes intermittently in the same lapse, or if the multi-body burner (7) goes out at any time, the electronic controller (10) sends a signal to the fuel gas supply solenoid system (8) for immediate shutdown and blocks the operation of the water heater (1) for a lapse of 10 to 15 seconds for the purpose of allowing gas dissipation in the combustion chamber (16) and perform an electronic overhaul of the components connected to the electronic controller (10).

Once the 10 to 15 seconds mentioned above have elapsed, a further attempt is made to ignite the water heater (1) until a continuous signal of the presence of the flame in the multibody burner (7) is obtained. If this signal is not detected after a total of three attempts, the electronic controller (10) will send a signal so that an error message will be displayed on screen (17), which indicates that as a safety precaution the system has been locked. temporarily.

Once the flame presence signal is detected by the electronic controller (10), the water inside the water tank (2) will be heated until the cold water inlet (11), Te, and water outlet temperature sensors (12) Ts send a signal to the electronic controller (10) indicating that the specified temperature has been reached. In turn the electronic controller (10) sends a signal to close the fuel gas supply solenoid valve system (8). The ignition cycle will be reactivated until any of the above conditions are met again. The electronic controller (10) is electrically powered from a power source (18) that operates through any combination of replaceable batteries, rechargeable batteries, or direct mains connection, as illustrated in Figure 2. By In turn, the electronic controller (10) will distribute the power supply to the different components to which it connects. The water chamber (19) shown in Figure 4 surrounds the combustion chamber (16) minimizing thermal energy losses to the sides of the combustion chamber (19), and beneath it is the multi-body burner (7). and its support (20). The water tank (2) on its inner face has a heat exchanger (21) shown in Figure 3, which is formed by a set of branches that allow the capture of most of the thermal energy contained in the flue gases later on. transfer this energy to the water contained in the water tank (2), being able to transfer the water in the tank between 80% and 95% of the thermal energy contained in the flue gases.

In the central part of the heat exchanger (21) there is a core (22) in the form of a cylindrical vessel (see Figure 3), whose function is to retard and redirect the combustion gases in their outlet path, forcing them passing through the branches forming the exchanger (21).

As seen in Figure 3, the outside of the water tank (2) is thermally insulated by applying an insulator (23) or covering a low thermal conductivity material, which may be polyurethane, mineral wool, ceramic fiber. , fiberglass or any other known in the art. The water heater (1) has an outer blade body (24) illustrated in Figure 2, which is coated with a corrosion resistant electrostatic paint to improve the aesthetics of the product, and ensures that the insulator (23) is Keep it positioned around the water tank (2) and protect both the insulator (23) and the water tank itself (2) from environmental effects. The outer body of the blade (24) shown in Figure 2 has a housing for the electronic controller (10) and at its base has openings located in the area where the multi-body burner (7) is located to allow air to enter. necessary for combustion.

On the left side of the outer body of the blade (24) is located the solenoid valve system (8) near the power source (18). Both the solenoid valve system (8) and the power source (18) are protected from thermal radiation from the multibody burner (7) by means of a pair of dividers (9).

On the other hand, as noted in Figure 5, the electronic controller (10) contains a series of buttons with which the user can operate the heater. The valve (6) located on the lower right side of the equipment allows drainage and cleaning of the water tank (2). The air deflector (25) shown in Figure 2 prevents air currents from entering the top of the heater, thereby preventing possible flame setbacks, and even extinguishing the flame in the multi-body burner. The water heater ( 1) does not operate most of the time unless any of the above lighting conditions are met. The above leads to a reduction in fuel gas consumption and as a consequence in the emission of contaminating gases into the environment.

Claims QUICK TYPE PASS WATER HEATER

RECOVERY

Claims (5)

A fast recovery type through-water heater, comprising: a multi-body burner and a solenoid valve system that regulates the gas passage to said burner safely; an electronic controller that manages the operation of the different components that make up the water heater; a bimetallic safety device to suspend system operation if the water temperature in the tank exceeds a predetermined value; an ignition electrode that generates a spark for ignition of the multibody burner and an ionization electrode that detects the ignition of the burner by means of an ionization phenomenon; a power source that works through any combination of replaceable batteries, rechargeable batteries or direct connection to a mains power supply; characterized by: a corrosion resistant water tank having a branched heat exchanger and a core supported in the central upper part of said exchanger, so that the joint configuration of these three components allows to delay the outlet and redirect the exhaust gases. combustion to take advantage of between 80% and 95% of its thermal energy; two temperature sensors placed one at the cold water inlet and one at the hot water outlet in such a configuration that allow the electronic controller to identify the water demand condition by presenting a 4 ° C difference between such temperature sensors; a water chamber surrounding the combustion chamber minimizing thermal energy losses to the sides of the combustion chamber; an air deflector device, the configuration of which prevents drafts from entering the upper part of the heater and prevents possible flame setbacks and even extinguishing the flame in the multi-body burner. Water heater according to claim 1, characterized in that the electronic controller sends the ignition signal under the following conditions: a) when there is a flow signal and the temperature sensor at the outlet of the hot water detects a temperature lower than the predetermined maximum cutting temperature on the electronic controller; b) will also be lit when the temperature detected by both sensors is lower than a preset value in the electronic controller as the minimum ignition temperature. Water heater according to claim 1, characterized in that the electronic controller sends the signal to close the solenoid valve system preventing the passage of combustible gas to the burner when both conditions as defined in claim 2 are no longer met. Water heater according to claim 1, characterized in that the electronic controller sends a signal to the solenoid valve system to allow fuel gas to pass to the multibody burner within 3 seconds of the start of the electric spark signal. and with that spark still in operation. Water heater according to Claim 4, characterized in that the electronic controller sends a signal to the fuel gas supply solenoid system for immediate shutdown and blocks the operation of the water heater if the flame signal is not received. by the electronic controller within 5 seconds or, if the signal flashes intermittently within the same lapse, or if the multi-body burner goes out at any time.