Gas heating water heating equipment and its expansion tank gas detection method

Abstract

The application discloses a gas heating water equipment and a gas deficiency detection method of an expansion water tank of the gas heating water equipment. The pressure sensor is arranged on the gas side of the expansion water tank of the gas heating water equipment, so that the pressure value of the gas side of the expansion water tank can be detected in real time. The method can detect whether the expansion water tank is short of gas in different time nodes and different situations, such as before the initial installation of the heating system, when the heating system enters the initial debugging stage, and after the installation is completed and used for a period of time. When the expansion water tank is short of gas, the corresponding prompt information is displayed through the display unit, so that the expansion water tank can be found short of gas in time. The expansion water tank is maintained by timely air supply, so that the abnormal condition that the water pressure of the heating system rises due to the shortage of the expansion water tank and the water that is expanded in volume is discharged through the safety pressure relief valve is avoided, the operation reliability of the gas heating water equipment is ensured, and the use experience of the user is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of gas-fired heating and hot water equipment technology, and in particular to a method for detecting gas shortage in gas-fired heating and hot water equipment and its expansion tank. Background Technology

[0002] The expansion tank in a gas-fired heating and hot water system is a crucial component connected to the heating system. When the expansion tank is properly inflated, its gas-side pressure is higher than the water pressure of the heating system at room temperature. Water from the heating system will not enter the expansion tank. However, when the water in the heating system is heated, it expands in volume, increasing the water pressure. The excess water then enters the expansion tank through its water inlet, absorbing the excess water and acting as a buffer to balance the system's pressure. If the gas-side pressure of the expansion tank falls below a certain value, causing a gas shortage, it will malfunction. As the heating system heats the water, the increased water pressure will trigger an abnormal situation where the safety relief valve releases the expanded water to relieve pressure.

[0003] Gas-fired heating and hot water equipment may experience gas shortages in its expansion tank under various circumstances. For example, if the equipment has been stored in a warehouse for an extended period, the gas in the expansion tank may have already become insufficient due to slow permeation by the time it is installed for the user. Alternatively, if the gas-fired heating and hot water equipment has been used for a period of time without timely maintenance and inspection, the expansion tank may also experience gas shortages over time.

[0004] Therefore, it is necessary to propose new technical solutions to detect air shortage in expansion tanks, so as to replenish air in a timely manner and avoid abnormal pressure relief valve leakage. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a method for detecting gas shortage in gas-fired heating and hot water equipment and its expansion tank, so as to solve the above problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This invention first provides a method for detecting air shortage in the expansion tank of a gas-fired heating and hot water system. The gas-fired heating and hot water system includes an expansion tank and a heating system. The expansion tank is connected to the water circuit of the heating system via a water inlet. A pressure sensor is installed on the gas side of the expansion tank. The method for detecting air shortage in the expansion tank includes:

[0008] Before the heating system is initially installed and water is added, the air side pressure value of the expansion tank is detected to determine whether it is lower than the set value. If the air side pressure value of the expansion tank is lower than the set value, it is determined that the expansion tank is out of air. Otherwise, initial debugging is performed, the initial air charging pressure value of the air side of the expansion tank is recorded, water is added to the heating system to a preset value, and the gas-fired heating water heater is started to heat.

[0009] The initial debugging water pressure rise value, average water temperature, water pressure value at the average water temperature during initial debugging, and air pressure value of the expansion tank of the heating system from normal temperature to the highest temperature during heating are recorded. It is detected whether the water pressure rise value of the heating system during heating is greater than the initial debugging water pressure rise value. If the water pressure rise value of the heating system during heating is greater than the initial debugging water pressure rise value, it is determined whether the current water pressure value of the heating system is greater than the water pressure value at the average water temperature during initial debugging and greater than a preset limit value. If so, it is determined that the expansion tank is out of air.

[0010] If the water pressure rise value of the heating system during heating is not greater than the initial debugging water pressure rise value, it is determined that the expansion tank can be normally used after initial debugging.

[0011] When the water pressure value of the heating system is lower than the initial air charging pressure value of the air side of the expansion tank, it is detected whether the air side pressure value of the expansion tank is lower than the initial air charging pressure value of the air side. If so, it is determined that the expansion tank is out of air.

[0012] Preferably, the gas-fired heating water heater further comprises a display unit for displaying fault information. When it is determined that the expansion tank is out of air before the heating system is initially installed and water is added, the display unit displays the air out fault.

[0013] Preferably, after the device is used for a period of time, the current water pressure value of the heating system is greater than the water pressure value at the average water temperature during initial debugging and greater than a preset limit value, it is determined that the expansion tank is out of air, and the display unit displays the air out fault.

[0014] Preferably, when the initial debugging is completed, it is determined that the expansion tank is out of air during normal use of the gas-fired heating water heater, and the display unit displays an air out warning.

[0015] Preferably, the expansion tank is provided with a valve core. When it is determined that the expansion tank is out of air before the heating system is initially installed and water is added, the valve core is used to charge air to the expansion tank to make the air side pressure value of the expansion tank reach the set value.

[0016] Preferably, when the initial debugging is completed, it is determined that the expansion tank is out of air during normal use of the gas-fired heating water heater, and the valve core is used to charge air to the expansion tank to make the air side pressure value of the expansion tank reach the initial air charging pressure value of the air side.

[0017] Preferably, the pressure value on the gas side of the expansion tank corresponds to a set value before the heating system is installed and before water is added, and the set value is the lowest limit value of the need for air supplement, and the lowest limit value is preset to 0.8 bar.

[0018] Preferably, the preset limit value corresponding to the current water pressure value of the heating system is 2.8 bar when the initial debugging stage is entered.

[0019] The application also provides a gas heating and hot water equipment, which comprises an expansion tank and a heating system, the expansion tank is connected to the water circuit of the heating system through a water circuit interface, and a pressure sensor is arranged on the gas side of the expansion tank, wherein the pressure sensor of the expansion tank is connected with a general control unit, and a gas shortage detection program of the expansion tank is stored in the storage medium of the general control unit, and the gas shortage detection program is executed to realize the gas shortage detection method of the expansion tank of the gas heating and hot water equipment as described above.

[0020] The technical effects achieved by the above technical solutions of the application include:

[0021] Based on the pressure sensor arranged on the gas side of the expansion tank of the gas heating and hot water equipment, according to the above gas shortage detection method of the expansion tank, the gas shortage of the expansion tank can be detected at different time nodes and different situations before the heating system is installed and before water is added, when the heating system enters the initial debugging stage, and after the installation is completed and used for a period of time, so that the expansion tank can be timely supplemented and maintained, and the abnormal situation caused by the expansion tank gas shortage is avoided, that is, the water pressure of the heating system rises when the gas heating and hot water equipment is used, and the safety relief valve is discharged to release the water that expands in volume, the operation reliability of the gas heating and hot water equipment is maintained, and the user's experience is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the flow chart of the gas shortage detection method of the expansion tank of the gas heating and hot water equipment provided by the embodiment of the application;

[0023] Figure 2 is a structural schematic diagram of the expansion tank. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the application clearer, the specific embodiments of the application will be described in detail below with reference to the drawings. The examples of these preferred embodiments are illustrated in the drawings. The embodiments of the application shown in the drawings and described according to the drawings are only exemplary, and the application is not limited to these embodiments.

[0025] It should be noted that, in order not to obscure the present application with unnecessary details, only the structures and / or processing steps closely related to the solution according to the present application are shown in the drawings, while other details not closely related are omitted.

[0026] For the current gas heating water equipment expansion tank will appear in the warehouse for a long time and long time use without maintenance and other various lack of gas situation, such as Figure 1 As shown in the figure, the embodiment of the present application provides a kind of gas heating water equipment expansion tank's lack of gas detection method, wherein, in combination Figure 2 As shown in the figure, the gas heating water equipment includes the expansion tank and heating system, the expansion tank 1 is connected to the waterway of the heating system by being provided with waterway interface 11, these are the general configuration of current gas heating water equipment, such as water pressure value of waterway, general gas heating water equipment will be configured corresponding pressure gauge display, the temperature value of heating system also has corresponding temperature detector and is displayed in display unit, the following is not described repeatedly, and in the present application, the gas side of the expansion tank 1 is provided with pressure sensor 12, which is added to measure the gas side pressure value of the expansion tank 1 in real time.

[0027] Specifically, the lack of gas detection method of the expansion tank 1 includes:

[0028] S1, initially install heating system, wait for water replenishment;

[0029] S11, before heating system is replenished with water, detect whether the gas side pressure value of the expansion tank 1 is lower than the set value;

[0030] S12, if the gas side pressure value of the expansion tank 1 is lower than the set value, determine that the expansion tank 1 lacks gas;

[0031] S13, otherwise, if the gas side pressure value of the expansion tank 1 is not lower than the set value, enter initial debugging, record the initial gas charging pressure value of the gas side of the expansion tank 1, replenish water to the heating system to the preset value, start the gas heating water equipment to heat;

[0032] S2, record the initial debugging water pressure rise value, average water temperature, water pressure value at initial debugging average water temperature and gas pressure value of the expansion tank 1 of heating system from normal temperature to highest temperature in heating process;

[0033] S21, detect whether the water pressure rise value of heating system during heating is greater than the initial debugging water pressure rise value;

[0034] S22, if the water pressure rise value of heating system during heating is greater than the initial debugging water pressure rise value, judge whether the current water pressure value of heating system is greater than the water pressure value at initial debugging average water temperature and greater than the preset limit value, if yes, determine that the expansion tank 1 lacks gas;

[0035] S3, if the water pressure of the heating system during heating is greater than the initial debugging water pressure, it is determined that the expansion tank 1 can be normally used after the initial debugging;

[0036] S31, when the water pressure of the heating system is lower than the initial air pressure value of the expansion tank 1, it is determined that the expansion tank 1 is out of gas.

[0037] According to the above-mentioned expansion tank 1 gas detection method, the gas detection of the expansion tank 1 can be carried out in real time before the initial installation of the heating system and after the initial debugging stage of the heating system and after the installation of the heating system for a period of time, so as to determine whether the gas needs to be supplemented, and the gas maintenance can be carried out in time, so as to avoid the abnormal condition that the water pressure of the heating system rises to cause the safety pressure relief valve to discharge the water with volume expansion.

[0038] To the step S12, when the heating system is not supplemented with water, the water pressure of the heating system is very low, lower than the air side pressure value of the expansion tank 1, if the air side pressure value of the expansion tank 1 is lower than the set value, the expansion tank 1 air pressure is low and needs to be supplemented; to the step S22 is the process of learning and recording of the heating system, by starting the heating system comprehensively, the maximum possible expansion of the heating system can be achieved, according to the average temperature being half of the sum of the inlet water temperature and the return water temperature, the average temperature of the heating system is calculated, the increment of the system water pressure is recorded under the average temperature in the process, the expected value in the later period should be in the range, when the water pressure of the heating system exceeds the increment range and is greater than the preset limit value, it should be considered that the expansion tank 1 is out of gas, which is also considered that the water pressure value of the heating system at room temperature will also change; to the step S31, after being used for a period of time, the water pressure of the heating system may decrease, such as the heating system has a slight leakage or the heating system has gas discharge to cause the pressure to decrease, at this time, if the air side pressure value of the expansion tank 1 decreases, it is lower than the initial air pressure value recorded on the system mainboard during debugging, the expansion tank 1 is out of gas.

[0039] Further, the gas heating water equipment further comprises a display unit for displaying fault information, connected with the pressure sensor 12. Generally, the gas heating water equipment is provided with a display screen to display various parameters in the heating system, so it can be used as the display unit for displaying fault information. In step S12 of the embodiment of the present application, when the gas in the expansion tank 1 is determined to be insufficient before water supplement in the initial installation of the heating system, the display unit displays the fault agent. Therefore, according to the display information of the fault agent, the installer can be reminded to inflate the expansion tank 1 to the set value in time, so as to avoid the situation that the new gas heating water equipment sold by the seller fails after being used by the user for a very short time, and to avoid affecting the user experience of the gas heating water equipment.

[0040] Similarly, in step S22, when the current water pressure value of the heating system is greater than the water pressure value at the initial debugging average water temperature and greater than the preset limit value after the equipment is used for a period of time, it is determined that the expansion tank 1 is insufficient in gas, and the display unit displays the gas shortage fault. The user can discover and inform the relevant personnel to inflate the expansion tank 1 in time.

[0041] In step S31, when the expansion tank 1 is determined to be insufficient in gas during the normal use of the gas heating water equipment after the initial debugging is completed, the display unit displays the gas shortage warning.

[0042] In order to supplement the gas in the expansion tank 1 in time, a valve core 13 is arranged on the expansion tank 1. In step S12, when the gas in the expansion tank is determined to be insufficient before water supplement in the initial installation of the heating system, the expansion tank 1 is inflated through the valve core 13 so that the gas side pressure value reaches the set value.

[0043] Similarly, in step S22, when the expansion tank 1 is determined to be insufficient in gas during the normal use of the gas heating water equipment after the initial debugging is completed, the expansion tank 1 is inflated through the valve core 13 so that the gas side pressure value reaches the initial inflation pressure value on the gas side.

[0044] Before water supplement in the initial installation of the heating system, the set value corresponding to the gas side pressure value of the expansion tank 1 is the lowest limit value of the gas supplement. According to experience, the lowest limit value of the gas side pressure of the expansion tank 1 is set, and if the value is below the limit value, it is considered that the gas supplement is needed at this time. It can be selected according to different gas heating water equipment and other factors. In the embodiment, the lowest limit value is preset to 0.8 bar. Similarly, the heating system is supplemented with water to a preset value, which can also be selected according to actual needs.

[0045] Similarly, in the initial debugging stage, the preset limit value corresponding to the current water pressure value of the heating system is 2.8 bar.

[0046] The embodiment of the present application also provides a gas heating water equipment as described above. Similarly, as shown inFigure 2 As shown, it comprises an expansion water tank 1 and a heating system, the expansion water tank 1 is communicated to the water circuit of the heating system through the water circuit interface 11, and the gas side of the expansion water tank 1 is provided with a pressure sensor 12.

[0047] The pressure sensor 12 of the expansion water tank 1 is connected with a total control unit, and the storage medium of the total control unit stores a gas deficiency detection program of the expansion water tank 1, which is executed to realize the gas deficiency detection method of the expansion water tank of the gas heating water heater as described above.

[0048] Similarly, the gas heating water heater comprises a display unit connected with the pressure sensor 12 for displaying fault information, and a valve core 13 is arranged on the expansion water tank 1 for supplementing gas for the expansion water tank 1.

[0049] It should be noted that in this article, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0050] The above is only a specific embodiment of the present application, and it should be noted that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should be considered as the protection scope of the present application.

Claims

1. A method for detecting air shortage in the expansion tank of a gas-fired heating and hot water system, characterized in that, The gas-fired heating and hot water equipment includes an expansion tank and a heating system. The expansion tank is connected to the water circuit of the heating system via a water inlet. A pressure sensor is installed on the gas side of the expansion tank. The method for detecting air shortage in the expansion tank includes: Before adding water to the heating system during initial installation, check whether the gas-side pressure of the expansion tank is lower than the set value. If the gas-side pressure of the expansion tank is lower than the set value, it is determined that the expansion tank is short of air. Otherwise, proceed to the initial commissioning, record the initial gas-side inflation pressure of the expansion tank, add water to the heating system to the preset value, and start the gas-fired heating and hot water equipment for heating. Record the initial test water pressure rise, average water temperature, water pressure at the initial test average water temperature, and air pressure in the expansion tank of the heating system from room temperature to the highest temperature during the heating process. Check whether the water pressure rise of the heating system during heating is greater than the initial test water pressure rise. If the water pressure rise of the heating system during heating is greater than the initial test water pressure rise, determine whether the current water pressure of the heating system is greater than the water pressure at the initial test average water temperature and greater than the preset limit value. If so, determine that the expansion tank is short of air. If the water pressure rise of the heating system does not exceed the initial test water pressure rise during the heating period, it is determined that the expansion tank can be used normally after the initial test. When the water pressure of the heating system is lower than the initial air pressure of the expansion tank, check whether the air pressure of the expansion tank is lower than the initial air pressure. If so, it is determined that the expansion tank is short of air.

2. The method for detecting air shortage in an expansion tank according to claim 1, characterized in that, The gas-fired heating and hot water equipment also includes a display unit for displaying fault information. When the expansion tank is found to be short of gas before the heating system is refilled for the first time, the display unit displays the fault information.

3. The method for detecting air shortage in an expansion tank according to claim 2, characterized in that, After the equipment has been used for a period of time, if the current water pressure of the heating system is greater than the water pressure at the initial average water temperature during commissioning and is also greater than the preset limit value, it is determined that the expansion tank is short of air, and the display unit displays the air shortage fault.

4. The method for detecting air shortage in an expansion tank according to claim 2, characterized in that, When the gas-fired heating and hot water equipment is in normal use after the initial commissioning is completed, if the expansion tank is found to be short of gas, the display unit will display a gas shortage warning.

5. The method for detecting air shortage in an expansion tank according to claim 1, characterized in that, The expansion tank is equipped with a valve core. When the expansion tank is found to be short of air before the heating system is installed for the first time and water is added, the valve core is used to inflate the expansion tank so that the air-side pressure value reaches the set value.

6. The method for detecting air shortage in an expansion tank according to claim 5, characterized in that, After the initial commissioning is completed, during normal use of the gas-fired heating and hot water equipment, if it is determined that the expansion tank is short of air, the expansion tank is inflated through the valve core to bring the air-side pressure value to the initial air-side inflation pressure value.

7. The method for detecting air shortage in an expansion tank according to claim 1, characterized in that, Before the heating system is first installed and water is added, the set value of the air-side pressure of the expansion tank is the minimum lower limit value that needs to be added, which is preset to 0.8 bar.

8. The method for detecting air shortage in an expansion tank according to claim 1, characterized in that, During the initial commissioning phase, the preset limit value corresponding to the current water pressure of the heating system is 2.8 bar.

9. A gas-fired heating and hot water equipment, characterized in that, It includes an expansion tank and a heating system. The expansion tank is connected to the water circuit of the heating system via a water inlet. A pressure sensor is installed on the air side of the expansion tank. The pressure sensor of the expansion tank is connected to a central control unit, and the storage medium of the central control unit stores a gas shortage detection program for the expansion tank, which is executed to implement the gas shortage detection method for the expansion tank of the gas heating and hot water equipment as described in any one of claims 1 to 8.

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