CN112629038A

CN112629038A - Gas control system of gas forced-ventilated formula constant temperature water heater

Info

Publication number: CN112629038A
Application number: CN202011513789.2A
Authority: CN
Inventors: 冯先维; 马志远; 杨琪
Original assignee: Zhongshan Powtek Appliances Manufacturing Ltd
Current assignee: Zhongshan Powtek Appliances Manufacturing Ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-04-09

Abstract

The invention discloses a gas control system of a gas forced-ventilated type constant-temperature water heater, which comprises a shell, wherein a combustor and a heat exchange assembly are arranged in the shell, the combustor is communicated with a gas pipe, the heat exchange assembly is communicated with a water inlet pipe and a water outlet pipe, a fan connected with the combustor is arranged in the shell, a microcomputer controller is arranged in the shell, a water flow sensor is arranged on the water inlet pipe, a gas proportional valve is arranged on the gas pipe, the combustor is connected with a pressure sensor, the pressure sensor monitors gas pressure in the combustor, and the fan, the water flow sensor, the gas proportional valve and the pressure sensor are all electrically connected with the microcomputer controller. According to the invention, the pressure value of the gas in the combustor is monitored at proper time, and different combustion-supporting air quantities are matched with different gas pressures through the microcomputer controller, so that the combustion working condition is improved, and the combustion is more sufficient.

Description

Gas control system of gas forced-ventilated formula constant temperature water heater

Technical Field

The invention relates to the field of gas water heaters, in particular to a gas control system of a gas forced-ventilated type constant-temperature water heater.

Background

At present, the common control mode is to achieve the constant temperature purpose by adjusting the opening degree of a gas proportional valve or to increase a water proportional valve, and the constant temperature is realized by adjusting the two-way adjusting mode of the water flow size and the opening degree of the gas valve. The opening degree of the gas proportional valve is controlled by the current value thereof. The air required by combustion of the water heater is matched with different fan rotating speeds according to different current values of the proportional valve. Under the condition that the heat load of the combustor and the aperture of the nozzle are determined, the magnitude of the gas pressure in the combustor determines the heat load output by the combustor. The existing gas proportional valve is generally controlled by using an electromagnetic principle, the copper coil is controlled to generate magnetic force by changing the current value of the copper coil input into the gas proportional valve, and the opening degree of a valve core can be adjusted by different magnetic forces so as to obtain different gas pressures in combustors.

However, at present, the problem that the load ratio is reduced due to the fact that the gas pressure value is reduced along with the increase of the temperature inside the water heater although the current value of the given gas proportional valve is unchanged is generally solved, because the resistance value is increased after the copper coil of the electromagnetic valve is heated, although the current value of the given gas proportional valve is kept unchanged by adopting a hardware constant-current technology, the generated magnetic force is weakened compared with the cold state, and the opening degree of the valve core is reduced. The gas pressure is reduced and the load is reduced accordingly. The relationship between resistance, voltage, current is: u = RI. When the voltage is constant, the smaller the resistance is, the larger the current is. The larger the current passing through the unit section is, the larger the heat generated by the enameled wire is. The more heat is generated by the coil, the higher the resistance and the smaller the current that passes. Therefore, the attraction force of the electromagnet decreases. Meanwhile, the structure of the gas proportional valve determines the defect of return difference in gas pressure regulation. The error reaches 30-80Pa, so that the load is not accurate and the problem of deviation occurs. For countries or regions where load input bias requirements are stringent, the production of water heaters becomes difficult. A new control system for a gas water heater is needed to avoid reliance on the accuracy of the gas proportional valve.

Disclosure of Invention

The invention provides a gas control system of a gas forced-ventilated type constant-temperature water heater, which can improve the combustion working condition and enable the combustion to be more sufficient by monitoring the pressure value of gas in a combustor timely and matching different gas pressures with different combustion-supporting air amounts through a microcomputer controller.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a gas forced-ventilated formula constant temperature water heater's gas control system, includes the casing, casing internally mounted have combustor and heat exchange assembly, combustor and gas pipe be linked together, heat exchange assembly be linked together with inlet tube and outlet pipe, the casing in install the fan that links to each other with the combustor, the casing in install microcomputer control ware, the inlet tube on install rivers sensor, the gas pipe on install the gas proportional valve, combustor and pressure sensor link to each other, pressure sensor monitor the gas pressure in the combustor, fan, rivers sensor, gas proportional valve and pressure sensor all with microcomputer control ware electric connection.

Preferably, the water inlet pipe is provided with a water inlet temperature probe, the water outlet pipe is provided with a water outlet temperature probe, and the water inlet temperature probe and the water outlet temperature probe are electrically connected with the microcomputer controller.

Preferably, the heat exchange assembly is provided with an overtemperature protection temperature controller.

Compared with the prior art, the invention has the beneficial effects that:

simple structure can in good time monitor the interior gas pressure value of combustor, gives different gas pressure matching different combustion air volume through microcomputer control ware, improves the burning operating mode, makes the burning more abundant. The flue gas index generated by combustion is lower than the standard flue gas index, and the method is energy-saving and environment-friendly. Meanwhile, when the pressure of the gas in the combustor is higher than the rated gas pressure due to a fault reason, the gas can be monitored in real time and matched with proper wind speed, and when the pressure is continuously higher than a safe pressure value, the system alarms and stops, so that the safety of a user is guaranteed.

Drawings

Fig. 1 is a front view structural diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the present invention provides a gas control system of a gas forced-ventilated type constant temperature water heater, comprising a housing 1, a burner and a heat exchange assembly 13 are arranged in the shell 1, the burner is communicated with the gas pipe 7, the heat exchange component 13 is communicated with the water inlet pipe 8 and the water outlet pipe 9, a fan 11 connected with a burner is arranged in the shell 1, it is characterized in that a microcomputer controller 2 is arranged in the shell 1, a water flow sensor 5 is arranged on the water inlet pipe 8, the gas pipe 7 is provided with a gas proportional valve 4, the burner is connected with a pressure sensor 6, pressure sensor 6 monitor the gas pressure in the combustor, fan 11, rivers sensor 5, gas proportional valve 4 and pressure sensor 6 all with microcomputer control ware 2 electric connection.

Simultaneously, inlet tube 8 on install into water temperature probe 3, outlet pipe 9 on install out water temperature probe 10, inlet temperature probe 3 and out water temperature probe 10 and microcomputer control ware 2 electric connection, inlet temperature probe 3 and out water temperature probe 10 real time monitoring inlet temperature and the leaving water temperature.

Preferably, the heat exchange assembly 13 is provided with an overtemperature protection temperature controller 12, which can perform overtemperature protection on the heat exchange assembly 13.

Examples

The water flows in from the water inlet pipe 8, and the water flow sensor 5 senses the water flow and generates a signal to the microcomputer controller 2. The microcomputer controller 2 starts the fan 11 to operate at a certain rotating speed, calculates the power to be input according to the water flow and the current outlet water temperature, controls the ignition system to ignite, and then opens the gas proportional valve 4. After the gas is ignited in the burner, the pressure in the burner is adjusted through the gas proportional valve 4, so that the temperature of the outlet water reaches the required set value.

At this in-process pressure sensor 6 gas pressure feedback in the monitoring combustor feeds back to

microcomputer control ware

2, and 2 analysis pressure sensor 6's of controller data, through the electric current size of adjusting gas proportional valve 4, and then the size of control admitting air to reduce the error of 4 output gas of gas proportional valve, make gas heater reach the setting value, simultaneously, microcomputer control ware 2 matches the amount of wind according to gas pressure data, ensures the normal clear of burning.

It should be noted that the air volume of the fan 11 is distributed by measuring the pressure in the air distributing rod of the burner through the pressure sensor 6, and in the past, the air is distributed through the proportional valve, and the effect proportional valve is easy to deviate, which may cause the unstable air volume of large air volume and small air volume, and thus the best effect cannot be achieved.

When the real-time pressure data value received by the microcomputer controller 2 from the pressure sensor 6 is higher than the set value, the alarm is started and the water supply is stopped.

While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the embodiments disclosed herein may be used in any combination, provided that there is no structural conflict, and the combinations are not exhaustively described in this specification merely for the sake of brevity and conservation of resources. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. The utility model provides a gas forced-ventilated formula constant temperature water heater's gas control system, includes casing (1), casing (1) internally mounted have combustor and heat exchange assembly (13), combustor and gas pipe (7) be linked together, heat exchange assembly (13) be linked together with inlet tube (8) and outlet pipe (9), casing (1) in install fan (11) that link to each other with the combustor, a serial communication port, casing (1) in install microcomputer control ware (2), inlet tube (8) on install rivers sensor (5), gas pipe (7) on install gas proportional valve (4), combustor and pressure sensor (6) link to each other, pressure sensor (6) monitor the gas pressure in the combustor, fan (11), rivers sensor (5), The gas proportional valve (4) and the pressure sensor (6) are electrically connected with the microcomputer controller (2).

2. The gas control system of the gas forced-ventilated type constant-temperature water heater as claimed in claim 1, wherein: inlet tube (8) on install into water temperature probe (3), outlet pipe (9) on install out water temperature probe (10), inlet temperature probe (3) and out water temperature probe (10) and microcomputer control ware (2) electric connection.

3. The gas control system of the gas forced-ventilated type constant-temperature water heater as claimed in claim 1, wherein: the heat exchange component (13) is provided with an overtemperature protection temperature controller (12).