CN108645032B

CN108645032B - gas stove

Info

Publication number: CN108645032B
Application number: CN201810629438.4A
Authority: CN
Inventors: 马曾文; 张坚伏; 张霞; 梁桂源; 郭特特
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2018-06-19
Filing date: 2018-06-19
Publication date: 2023-10-13
Anticipated expiration: 2038-06-19
Also published as: CN108645032A

Abstract

The application provides a gas furnace. The gas furnace comprises a burner assembly, a primary heat exchanger, a smoke absorption assembly and a secondary heat exchanger. The primary heat exchanger is disposed within the burner assembly. The flue gas absorbing assembly is connected with the burner assembly. The secondary heat exchanger is arranged in the flue gas absorption assembly. The gas furnace also comprises a water return pipeline, a three-way valve, a heating pipeline and a temperature detector. The water return pipeline is respectively connected with the water inlet of the secondary heat exchanger and the water inlet of the primary heat exchanger through the three-way valve. The temperature detector is used for detecting the water temperature value of the water return pipeline, and the controller is electrically connected with the temperature detector and the three-way valve. By adopting the technical scheme of the application, the flue gas temperature in the water return pipeline can be prevented from being reduced to be lower than the dew point temperature to generate a large amount of condensed water, so that severe corrosion of excessive condensed water to the flue pipe is avoided, and the potential safety hazard caused by freezing of the condensed water at the outlet of the flue pipe can be solved.

Description

Gas stove

Technical Field

The application relates to the technical field of gas equipment, in particular to a gas furnace.

Background

In order to improve the heat efficiency, the condensing type gas wall-mounted boiler can reuse generated high-temperature flue gas. Heat exchange is carried out between the water return line and the high-temperature flue gas, so that the heat of the high-temperature flue gas can be utilized.

However, in the above-mentioned waste heat utilization method, the temperature of the flue gas is reduced, and when the temperature of the flue gas is lower than the dew point temperature, the water vapor therein is condensed into condensed water. The condensed water formed in the smoke tube can cause serious corrosion to the smoke tube. When the ambient temperature is lower, the condensed water is easy to freeze at the outlet of the smoke pipe to form an ice blade, and the potential safety hazard of falling of the ice blade exists when the ice blade is installed in a high-rise building.

Disclosure of Invention

The embodiment of the application provides a gas furnace, which aims to solve the technical problem that the gas furnace in the prior art is easy to generate more condensed water when carrying out waste heat utilization on high-temperature flue gas.

The embodiment of the application provides a gas furnace, which comprises the following components: a burner assembly; the primary heat exchanger is arranged in the burner assembly group and is used for absorbing combustion heat; the smoke absorption assembly is connected with the burner assembly and is used for absorbing smoke generated by the burner assembly; the secondary heat exchanger is arranged in the smoke absorption assembly and is used for absorbing smoke heat; the water return pipeline is respectively connected with the water inlet of the secondary heat exchanger and the water inlet of the primary heat exchanger through the three-way valve, and the water outlet of the secondary heat exchanger is connected with the water inlet of the primary heat exchanger; a heating pipeline connected with the water outlet of the primary heat exchanger; the temperature detector is used for detecting the water temperature value of the water return pipeline; and the controller is electrically connected with the temperature detector and the three-way valve, and is used for acquiring the water temperature value detected by the temperature detector and controlling the operation of the three-way valve according to the water temperature value.

In one embodiment, a three-way valve includes: a first state in which the first heat exchanger is connected to the first heat exchanger and disconnected from the second heat exchanger; a second state disconnected from the primary heat exchanger and communicated with the secondary heat exchanger; when the water temperature value is in the first temperature interval, the controller controls the three-way valve to operate to a first state; when the water temperature value is in the second temperature interval, the controller controls the three-way valve to operate to a second state.

In one embodiment, the three-way valve further comprises: a third state in which the first heat exchanger and the second heat exchanger are both communicated; when the water temperature value is in the third temperature interval, the controller controls the three-way valve to operate to a third state, and the water quantity ratio of the secondary heat exchanger to the primary heat exchanger is regulated in proportion according to the water temperature value.

In one embodiment, the return line passes through the burner assembly before passing to the three-way valve.

In one embodiment, a flue gas absorbing assembly includes: and the air machine part is connected with the burner assembly and is used for absorbing the smoke generated by the burner assembly and supplying the smoke to the secondary heat exchanger.

In one embodiment, the flue gas absorbing assembly further comprises a wind pressure switch connected to the fan member.

In one embodiment, the gas burner further comprises a water pump disposed on the return line.

In one embodiment, the gas burner further comprises an expansion tank connected to the return line.

In one embodiment, the gas burner further comprises: the plate heat exchanger is provided with a heat release inlet, a heat release outlet, a heat absorption inlet and a heat absorption outlet; a heat supply branch pipe which is separated from the heat supply pipe and is connected with a heat release inlet of the plate heat exchanger, and a heat release outlet of the plate heat exchanger is connected with a water return pipe; the cold water pipeline is connected with the heat absorption inlet of the plate heat exchanger, and the hot water pipeline is connected with the heat absorption outlet of the plate heat exchanger.

In one embodiment, the gas burner further comprises a gas line connected to the burner assembly.

In the above embodiment, if the water temperature value is lower than the dew point temperature, the three-way valve is controlled to directly connect the water return line with the primary heat exchanger, and the primary heat exchanger is directly adopted to heat the water in the water return line, and then the heat supply line supplies heat. Therefore, the low-temperature water in the water return pipeline can be prevented from reducing the temperature of the flue gas to be lower than the dew point temperature to generate a large amount of condensed water, so that severe corrosion of excessive condensed water to the flue pipe is avoided, and the potential safety hazard caused by freezing of the condensed water at the outlet of the flue pipe can be solved. If the water passing temperature is higher than the dew point temperature, the three-way valve is controlled to directly connect the water return pipeline with the second-stage heat exchanger, and at the moment, water in the water return pipeline passes through the second-stage heat exchanger, then passes through the first-stage heat exchanger, and finally enters the heating pipeline to supply heat. Thus, the secondary heat exchanger will not drop the flue gas temperature below the dew point temperature, as the water temperature value of the water in the water return line is higher than the dew point temperature.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

fig. 1 is a schematic overall structure of an embodiment of a gas burner according to the present application.

Detailed Description

The present application will be described in further detail with reference to the following embodiments and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present application more apparent. The exemplary embodiments of the present application and the descriptions thereof are used herein to explain the present application, but are not intended to limit the application.

Fig. 1 shows an embodiment of a gas burner of the present application comprising a burner assembly 10, a primary heat exchanger 20, a flue gas absorption assembly 30 and a secondary heat exchanger 40. A primary heat exchanger 20 is disposed within the bank of burner assemblies 10 for absorbing combustion heat. The smoke absorbing assembly 30 is connected to the burner assembly 10 for absorbing smoke generated by the burner assembly 10. A secondary heat exchanger 40 is disposed within the flue gas absorber assembly 30 for absorbing flue gas heat. The gas burner further includes a water return line 50, a three-way valve 60, a heating line 70 and a temperature detector 80. The water return pipeline 50 is respectively connected with the water inlet of the secondary heat exchanger 40 and the water inlet of the primary heat exchanger 20 through the three-way valve 60, the water outlet of the secondary heat exchanger 40 is connected with the water inlet of the primary heat exchanger 20, and the heat supply pipeline 70 is connected with the water outlet of the primary heat exchanger 20. The temperature detector 80 is used for detecting the water temperature value of the water return line 50, the controller is electrically connected with the temperature detector 80 and the three-way valve 60, and the controller is used for acquiring the water temperature value detected by the temperature detector 80 and controlling the operation of the three-way valve 60 according to the water temperature value.

By adopting the technical scheme of the application, the water temperature value of the water return pipeline 50 is detected by the temperature detector 80, then the water temperature value is obtained by the controller, and the operation of the three-way valve 60 is controlled according to the water temperature value. The temperature at which water vapor begins to condense in high temperature flue gas is referred to as the dew point temperature of the flue gas, and condensation occurs when the flue gas temperature is below the dew point temperature. In the case of a gas burner determination, the flue gas temperature and the return water temperature are greatly related, and a low water temperature value in the return water line 50 can reduce the flue gas temperature, thereby generating more condensation. If the water temperature is lower than the dew point temperature, the three-way valve 60 is controlled to directly connect the water return line 50 with the primary heat exchanger 20, and the primary heat exchanger 20 is directly adopted to heat the water in the water return line 50, and then the heat supply line 70 supplies heat. In this way, the low-temperature water in the water return pipeline 50 can be prevented from reducing the temperature of the flue gas to be lower than the dew point temperature to generate a large amount of condensed water, so that serious corrosion of excessive condensed water to the flue pipe is avoided, and the potential safety hazard caused by freezing of the condensed water at the outlet of the flue pipe can be solved. If the excess water temperature is higher than the dew point temperature, the three-way valve 60 is controlled to directly connect the water return line 50 with the secondary heat exchanger 40, and at this time, the water in the water return line 50 passes through the secondary heat exchanger 40, then passes through the primary heat exchanger 20, and finally enters the heating line 70 for heating. Thus, since the water temperature value of the water in the water return line 50 is higher than the dew point temperature, the secondary heat exchanger 40 will not drop the flue gas temperature below the dew point temperature.

Optionally, a heating water outlet temperature sensor and a safety temperature limiter are further arranged on the heating pipeline 70, the water outlet temperature of the heating pipeline 70 can be known through the heating water outlet temperature sensor, and the water outlet temperature can be limited in a proper interval through the safety temperature limiter.

Optionally, in the technical solution of the present embodiment, the three-way valve 60 includes: a first state in which it is in communication with the primary heat exchanger 20 and disconnected from the secondary heat exchanger 40; a second state in which it is disconnected from the primary heat exchanger 20 and in communication with the secondary heat exchanger 40. In use, when the water temperature value is within the first temperature interval, the controller controls the three-way valve 60 to operate to the first state; when the water temperature value is in the second temperature interval, the controller controls the three-way valve 60 to operate to the second state. The first temperature range is a temperature range having a temperature lower than the dew point temperature, and the second temperature range is a temperature range having a temperature far higher than the dew point temperature. More preferably, the three-way valve 60 further includes a third state in communication with both the primary heat exchanger 20 and the secondary heat exchanger 40. In use, when the water temperature value is in the third temperature interval, the controller controls the three-way valve 60 to operate to the third state and adjusts the water flow ratio to the secondary heat exchanger 40 to the primary heat exchanger 20 in proportion to the water temperature value. The third temperature range is a temperature range higher than the dew point temperature, but the temperature range is only limited to be higher than the dew point temperature, and a large amount of low-temperature water may be introduced into the secondary heat exchanger 40 in this range, so that a large amount of condensed water may be generated. Therefore, in the third temperature section, when the wall-hanging boiler operation load or the environment or the like causes an increase in the water temperature value of the water in the water return line 50, the water amount ratio to the secondary heat exchanger 40 is gradually increased, thereby better avoiding the generation of condensed water.

In the technical scheme of the application, when the water temperature value of water in the water return pipeline 50 is lower than 30 degrees, the flue gas is easy to condense into condensed water in the flue pipe through research. Therefore, the dew point temperature should be 30 degrees.

As a preferred embodiment, the three-way valve 60 is driven by a stepper motor, and the controller controls the three-way valve 60 by controlling the stepper motor.

In the solution of the present embodiment, as shown in fig. 1, the return line 50 passes through the burner assembly 10 before passing to the three-way valve 60. In this way, the return line 50 may absorb heat transfer on the burner assembly 10, improving thermal energy utilization. Optionally, the burner assembly 10 includes a burner and a fire detector pin and an ignition pin disposed on the burner.

Optionally, in the technical solution of the present embodiment, the flue gas absorbing assembly 30 includes: a wind work 31 is connected to the burner assembly 10. In use, the fan member 31 absorbs the flue gas generated by the burner assembly 10 and supplies the flue gas to the secondary heat exchanger 40. More preferably, the flue gas absorbing assembly 30 further comprises a wind pressure switch 32, and the wind pressure switch 32 is connected with the fan member 31. The wind pressure switch 32 has the function of ensuring that the device can timely close the fuel gas under the condition of unsmooth air exhaust and ensure that the fuel gas does not leak, thereby protecting personal safety.

Optionally, in the technical solution of the present embodiment, the gas stove further includes a water pump 90, and the water pump 90 is disposed on the water return line 50. In use, the water pump 90 not only provides water flow power to the water return line 50, but also to the overall circulation system.

Preferably, the gas furnace further comprises an expansion tank 100, the expansion tank 100 being connected to the water return line 50. Expansion tank 100 accommodates the expansion of the system water in the heating system while also providing a constant pressure and replenishing the system water.

Optionally, as shown in fig. 1, in the technical solution of the present embodiment, the gas furnace further includes a plate heat exchanger 110, a heat supply branch line 71, a cold water line 120 and a hot water line 130. The plate heat exchanger 110 is provided with a heat release inlet, a heat release outlet, a heat absorption inlet, and a heat absorption outlet. The heat supply branch line 71 branches from the heat supply line 70 and is connected to a heat release inlet of the plate heat exchanger 110, and a heat release outlet of the plate heat exchanger 110 is connected to the return line 50. The cold water line 120 is connected to the heat absorption inlet of the plate heat exchanger 110, and the hot water line 130 is connected to the heat absorption outlet of the plate heat exchanger 110. In use, the heat-supplying branch line 71 passes hot water from the heat-releasing inlet to the plate heat exchanger 110 and then passes the heat-releasing outlet to the water-return line 50, the cold water line 120 passes cold water from the heat-absorbing inlet of the plate heat exchanger 110, absorbs the heat of the hot water by the plate heat exchanger 110, and then passes the warmed water from the heat-releasing outlet to the hot water line 130. Optionally, a three-way valve is provided in the heating line 70, from which the heating branch line 71 branches off, by means of which the operation of the heating branch line 71 can be controlled.

As shown in fig. 1, the gas burner also includes a gas line 140, the gas line 140 being connected to the burner assembly 10. Optionally, a fuel gas proportional valve 141 is provided on the fuel gas line 140 to adjust the supply amount of fuel gas.

Specifically, when the gas furnace of the application starts up the unit, the wind machine part 31 is started up first, and when the wind pressure switch detects the pressure difference signal generated by the air flow of the fan on the venturi tube, the signal is fed back to the controller. Second, the ignition needle of the burner assembly 10 ignites and the gas proportional valve on the gas line 140 opens to deliver gas. And in the running process, the controller monitors the wind pressure switch state in real time, and when the conditions of over-low rotation speed of the wind machine part 31, stalling of the wind machine part 31, over-high flue resistance (blockage) and the like occur, the wind pressure switch acts to send a signal to the controller, and the unit stops running.

It should be noted that the technical scheme of the gas furnace is particularly suitable for condensing type gas wall-mounted furnaces.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, and various modifications and variations can be made to the embodiments of the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A gas burner, comprising:

a burner assembly (10);

a primary heat exchanger (20) disposed within the set of burner assemblies (10) for absorbing combustion heat;

a smoke absorbing assembly (30) connected to the burner assembly (10) for absorbing smoke generated by the burner assembly (10);

a secondary heat exchanger (40) arranged in the flue gas absorption assembly (30) and used for absorbing flue gas heat;

the water return pipeline (50) is connected with the water inlet of the second-stage heat exchanger (40) and the water inlet of the first-stage heat exchanger (20) respectively through the three-way valve (60), and the water outlet of the second-stage heat exchanger (40) is connected with the water inlet of the first-stage heat exchanger (20);

a heating pipeline (70) connected with the water outlet of the primary heat exchanger (20);

a temperature detector (80) for detecting a water temperature value of the return line (50);

and the controller is electrically connected with the temperature detector (80) and the three-way valve (60), and is used for acquiring the water temperature value detected by the temperature detector (80) and controlling the operation of the three-way valve (60) according to the water temperature value.

2. A gas burner according to claim 1, wherein said three-way valve (60) comprises: a first state in which it communicates with the primary heat exchanger (20) and is disconnected from the secondary heat exchanger (40);

a second state disconnected from the primary heat exchanger (20) and communicating with the secondary heat exchanger (40);

when the water temperature value is in a first temperature interval, the controller controls the three-way valve (60) to operate to the first state; the controller controls the three-way valve (60) to operate to the second state when the water temperature value is in a second temperature interval.

3. A gas burner according to claim 2, wherein said three-way valve (60) further comprises: a third state in communication with both the primary heat exchanger (20) and the secondary heat exchanger (40);

when the water temperature value is in a third temperature interval, the controller controls the three-way valve (60) to operate to the third state, and the water quantity ratio of the secondary heat exchanger (40) to the primary heat exchanger (20) is regulated in proportion to the water temperature value.

4. A gas burner according to claim 1, wherein the return line (50) passes through the burner assembly (10) before passing to the three-way valve (60).

5. A gas burner according to claim 1, wherein said fume absorption assembly (30) comprises: and the air machine part (31) is connected with the burner assembly (10) and is used for absorbing the smoke generated by the burner assembly (10) and supplying the smoke to the secondary heat exchanger (40).

6. A gas burner according to claim 5, wherein said fume absorption assembly (30) further comprises a wind pressure switch (32), said wind pressure switch (32) being connected to said fan element (31).

7. The gas burner according to claim 1, further comprising a water pump (90), said water pump (90) being arranged on said water return line (50).

8. A gas burner according to claim 1, further comprising an expansion tank (100), said expansion tank (100) being connected to said return line (50).

9. The gas burner of claim 1, further comprising:

a plate heat exchanger (110), wherein a heat release inlet, a heat release outlet, a heat absorption inlet and a heat absorption outlet are arranged on the plate heat exchanger (110);

a heat supply branch line (71) which is branched from the heat supply line (70) and is connected to a heat release inlet of the plate heat exchanger (110), and a heat release outlet of the plate heat exchanger (110) is connected to the water return line (50);

a cold water line (120) and a hot water line (130), the cold water line (120) being connected to the heat absorbing inlet of the plate heat exchanger (110), the hot water line (130) being connected to the heat absorbing outlet of the plate heat exchanger (110).

10. The gas burner according to claim 1, further comprising a gas line (140), said gas line (140) being connected to said burner assembly (10).