CN108679852A - A kind of gas heater with gas flowmeter - Google Patents

Abstract

The invention discloses a gas water heater with a gas flow meter, comprising: a gas water heater body, a heat exchanger installed on the gas water heater body, a burner providing heat for the heat exchanger, and an air intake pipeline connected with the gas water heater. A gas proportional valve connected to the burner, and a main controller connected to the gas proportional valve; it is characterized in that a gas flow meter for detecting the current gas flow is provided on the air intake pipeline, and the gas flow meter is connected with the gas flow meter The main controller is connected, and the main controller includes a size comparison module for comparing the current gas flow with the actual required gas flow, and an execution module for adjusting the opening of the gas proportional valve according to the signal fed back by the comparison module . There is no need to set the minimum opening and maximum opening of the gas proportional valve during production, which has high production efficiency and reduces the impact of human error; and avoids the embarrassment of high water inlet temperature in summer and low air inlet pressure in the user's home without an adjustable range .

Description

A gas water heater with a gas flow meter

technical field

The invention relates to the technical field of fluid heaters, in particular to a gas water heater with a gas flow meter.

Background technique

Existing gas water heaters need to manually set and adjust the parameters of the water heater during production, and limit a minimum gas volume and a maximum gas volume for the water heater, that is, the minimum opening and maximum opening of the gas proportional valve. Gas proportional valves with different structures need to be sampled To determine the specific opening, the adjustment process will cause deviations due to production rate, gas proportional valve parameter drift or other human factors, which will affect the performance of the whole machine, such as low-load flameout and maximum load failure. Due to the limitation of the minimum opening, if the inlet water temperature is relatively high in summer, the water will be overheated; due to the limitation of the maximum opening, if the intake pressure in the user's home is too low, the set temperature will not be reached.

Contents of the invention

In view of the defects in the prior art, the object of the present invention is to provide a gas water heater with a gas flow meter that does not need to be set during production.

To achieve the above object, the present invention adopts the following technical solutions.

A gas water heater with a gas flowmeter, comprising: a gas water heater body, a heat exchanger is installed on the gas water heater body, a burner that provides heat for the heat exchanger, and The connected gas proportional valve, and the main controller connected with the gas proportional valve; it is characterized in that a gas flow meter for detecting the current gas flow is provided on the air intake pipeline, and the gas flow meter is connected with the main The controller is connected, and the main controller includes a size comparison module for comparing the current gas flow with the actual required gas flow, and an execution module for adjusting the opening of the gas proportional valve according to the signal fed back by the comparison module.

As a further description of the above solution, the actual required gas flow rate is determined by the inlet water temperature, the inlet water flow rate and the set hot water temperature.

As a further description of the above scheme, a water flow sensor and a water inlet probe are installed on the gas water heater body, the water flow sensor is used to detect the water flow flowing through the heat exchanger, and the water inlet probe is used to The temperature of the cold water entering the heat exchanger is sensed.

The actual required gas flow V2 is calculated by the following _formula :

In the formula, η represents thermal efficiency, H ₁ represents the low calorific value of gas, C _p represents the specific heat of water, all of which are constants, t ₀ represents the inlet water temperature, which is measured by the water inlet probe, and V ₁ represents the water flow rate, which is determined by the water flow rate sensor; if the gas flow detected by the gas flow meter is greater than the actual required gas flow V ₂ , then control the opening of the gas proportional valve to decrease; if the gas flow detected by the gas flow meter is less than the actual required gas flow flow V ₂ , the opening of the gas proportional valve is controlled to increase.

As a further description of the above solution, the actual required gas flow rate is an empirical value solidified in the storage module of the main controller.

As a further description of the above scheme, a hot water outlet pipe is connected to the heat exchanger, and a water outlet probe connected to the main controller is provided on the hot water outlet pipe; The hot water temperature value detected by the water outlet probe and the set hot water temperature value fine-tune the opening of the gas proportional valve.

As a further description of the above solution, a display for real-time display of gas flow is connected to the main controller.

As a further illustration of the above solution, an alarm device is connected to the main controller, and when the gas water heater is not working, if the gas flowmeter detects a gas flow signal, the alarm device is controlled to send out an alarm signal.

As a further description of the above solution, the alarm device is a buzzer or a voice prompt device.

As a further description of the above solution, the main controller calculates the accumulated gas volume according to the signal fed back by the gas flowmeter, and displays the accumulated gas volume through the display.

The beneficial effects of the present invention are:

1. Use the gas flow meter to collect the current gas flow, and use the comparison module and the execution module to accurately adjust the opening of the gas proportional valve in real time. It is not necessary to set the minimum opening and maximum opening of the gas proportional valve during production, and the production efficiency is high. And reduce the impact of human error; and avoid the embarrassment of high water inlet temperature in summer and low air inlet pressure in the user's home without an adjustable range.

2. It can provide real-time feedback on the current gas consumption of the water heater, which is convenient for the main controller to adjust. Users can check the current gas consumption and cumulative gas consumption of the water heater at any time;

3. When the gas water heater detects gas flow when it is in standby, the alarm will prompt the user, which is safe.

Description of drawings

Fig. 1 is a schematic structural diagram of a gas water heater with a gas flow meter provided by the present invention.

Fig. 2 is a block diagram showing the control principle of the gas water heater with a gas flow meter provided by the present invention.

Explanation of reference signs:

1: Gas water heater body, 2: Heat exchanger, 3: Burner, 4: Intake pipeline, 5: Gas proportional valve, 6: Main controller, 7: Gas flow meter, 8: Water flow sensor, 9: Inlet Water probe, 10: hot water outlet pipe, 11: water outlet probe, 12: display, 13: alarm device.

Detailed ways

In the description of the present invention, it should be noted that for orientation words, such as the term "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower" , "Front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise " and other indication orientations and positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, or in a specific orientation. The structure and operation should not be construed as limiting the specific protection scope of the present invention.

In addition, terms such as "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of technical features. Therefore, the definition of "first" and "second" features may explicitly or implicitly include one or more of these features. In the description of the present invention, the meaning of "at least" is one or more than one, unless otherwise expressly and specifically limit.

In the present invention, unless otherwise clearly specified and limited, if there are terms "assembled", "connected" and "connected", the terms should be interpreted in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral ground connection; it can also be a mechanical connection; it can be directly connected, or connected through an intermediary, or two components can be connected internally. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the invention, unless otherwise specified and limited, a first feature being "on" or "under" a second feature may include that the first and second features are in direct contact, or that the first and second features are not in direct contact. contact but through another feature contact between them. Moreover, "above", "below" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the level of the first feature is higher than that of the second feature the height of. "Above", "under" and "beneath" the first feature on the second feature include that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

The specific embodiments of the present invention will be further described below in conjunction with the drawings in the specification, so as to make the technical solutions and beneficial effects of the present invention more clear and definite. The embodiments described below by referring to the figures are exemplary for the purpose of explaining the present invention and should not be construed as limiting the present invention.

As shown in Figure 1 and Figure 2, a gas water heater with a gas flow meter includes: a gas water heater body 1, a heat exchanger 2 is installed on the gas water heater body 1 to provide heat for the heat exchanger 2 The burner 3, the gas proportional valve 5 connected to the burner 3 through the intake pipeline 4, and the main controller 6 connected to the gas proportional valve 5; it is characterized in that, on the intake pipeline 4 A gas flow meter 7 for detecting the current gas flow is provided, the gas flow meter 7 is connected with the main controller 6, and the main controller 6 includes a gas flow meter for comparing the current gas flow with the actual required gas flow A comparison module, and an execution module for adjusting the opening degree of the gas proportional valve 5 according to the signal fed back by the comparison module.

Among them, the actual required gas flow rate is determined by the inlet water temperature, the inlet water flow rate and the set hot water temperature. In this embodiment, a water flow sensor 8 and a water inlet probe 9 are preferably installed on the gas water heater body 1, the water flow sensor 8 is used to detect the water flow flowing through the heat exchanger 2, and the inlet The water probe 9 is used to detect the temperature of the cold water entering the heat exchanger ₂ ; the actual required gas flow V2 is calculated by the calculation module according to the following formula:

In the formula, η represents thermal efficiency, H ₁ represents the low calorific value of gas, C _p represents the specific heat of water, all of which are constants, t ₀ represents the inlet water temperature, which is measured by the water inlet probe, and V ₁ represents the water flow rate, which is determined by the water flow rate measured by the sensor. If the gas flow detected by the gas flow meter is greater than the actual required gas flow V ₂ , the opening of the gas proportional valve is controlled to decrease; if the gas flow detected by the gas flow meter is smaller than the actual required gas flow V ₂ , Then the opening degree of the gas proportional valve is controlled to increase. In other implementation manners, the actual required gas flow rate may also be an empirical value solidified in the storage module of the main controller.

Preferably, a water outlet probe 11 connected to the main controller 6 is provided on the hot water outlet pipe 10 of the heat exchanger 2; value and the set hot water temperature value to fine-tune the opening of the gas proportional valve 5 to achieve the accuracy of temperature control and the effect of constant temperature.

Further preferably, a display 12 is connected to the main controller 6, and the main controller 6 calculates the accumulated gas volume according to the signal fed back by the gas flowmeter 7, and displays the accumulated gas volume and the current gas flow through the display 12, It is convenient for users to check the current gas consumption and cumulative gas consumption of the gas water heater at any time.

Further preferably, an alarm device 13 is connected to the main controller 6, and when the gas water heater is not working, if the gas flowmeter 7 detects an air flow signal, the alarm device 13 is controlled to send out an alarm signal. The alarm device is a buzzer or a voice prompt device.

This embodiment provides a gas water heater with a gas flow meter. The gas flow meter is used to collect the current gas flow, and the comparison module and the execution module are used to accurately adjust the opening of the gas proportional valve in real time. The gas proportional valve does not need to be installed during production. The setting of the minimum opening and the maximum opening increases the production efficiency and reduces the impact of human error; and avoids the embarrassment of high water inlet temperature in summer and low air inlet pressure in the user's home without an adjustable range.

Through the description of the above structure and principle, those skilled in the art should understand that the present invention is not limited to the above-mentioned specific embodiments, and that improvements and substitutions using known technologies in the art on the basis of the present invention all fall under the protection of the present invention. Scope, the protection scope of the present invention shall be defined by the terms of each claim and their equivalents. Parts not described in the detailed description are prior art or common knowledge.

Claims (9)

1. A gas water heater with a gas flowmeter, comprising: a gas water heater body, on which a heat exchanger is installed, a burner providing heat for the heat exchanger, and a gas inlet pipe connected to the gas water heater A gas proportional valve connected to the burner, and a main controller connected to the gas proportional valve; it is characterized in that a gas flowmeter for detecting the current gas flow is provided on the air intake pipeline, and the gas flowmeter is connected to the gas flowmeter The main controller is connected to the main controller, and the main controller includes a size comparison module for comparing the current gas flow with the actual required gas flow, and an execution module for adjusting the opening of the gas proportional valve according to the signal fed back by the comparison module. 2. A gas water heater with a gas flow meter according to claim 1, wherein the actual required gas flow is determined by the inlet water temperature, the inlet water flow and the set hot water temperature. 3. A gas water heater with a gas flow meter according to claim 2, characterized in that a water flow sensor and a water inlet probe are installed on the gas water heater body, and the water flow sensor is used to detect the The water flow rate of the heat exchanger, the water inlet probe is used to detect the temperature of cold water entering the heat exchanger; The actual required gas flow V2 is calculated by the following _formula : In the formula, η represents thermal efficiency, H ₁ represents the low calorific value of gas, C _p represents the specific heat of water, all of which are constants, t ₀ represents the inlet water temperature, which is measured by the water inlet probe, and V ₁ represents the water flow rate, which is determined by the water flow rate Measured by the sensor; If the gas flow detected by the gas flow meter is greater than the actual required gas flow V ₂ , the opening of the gas proportional valve is controlled to decrease; if the gas flow detected by the gas flow meter is smaller than the actual required gas flow V ₂ , Then the opening degree of the gas proportional valve is controlled to increase. 4. A gas water heater with a gas flow meter according to claim 2, characterized in that the actual required gas flow is an empirical value solidified in the storage module of the main controller. 5. A gas water heater with a gas flow meter according to claim 1, characterized in that a hot water outlet pipe is connected to the heat exchanger, and a A water outlet probe connected to the main controller; the main controller fine-tunes the opening of the gas proportional valve according to the hot water temperature value detected by the water outlet probe and the set hot water temperature value. 6. A gas water heater with a gas flow meter according to claim 1, characterized in that a display for real-time display of the gas flow is connected to the main controller. 7. A gas water heater with a gas flow meter according to claim 1, wherein an alarm device is connected to the main controller, and when the gas water heater is not working, if the gas flow meter detects If there is an airflow signal, the alarm device is controlled to send out an alarm signal. 8. A gas water heater with a gas flow meter according to claim 7, wherein the alarm device is a buzzer or a voice prompt device. 9. A gas water heater with a gas flow meter according to claim 1, characterized in that the main controller calculates the cumulative gas volume according to the signal fed back by the gas flow meter, and displays the cumulative gas volume on the display .