Electronic differential pressure flow switch

Abstract

The application discloses an electronic differential pressure flow switch, which comprises the following steps: an electronic flow differential pressure switch is in communication connection with a main control system, the main control system is in communication connection with an LED panel, and exhaust pipe temperature and exhaust pipe differential pressure values detected are displayed on the LED panel; and the main control system is also in communication connection with an ignition switch and an alarm, differential pressure data of the exhaust pipe are acquired through a thermal flow differential pressure sensor, the differential pressure data are analyzed through overall comprehensive analysis and then through time and space dimensions, respectively, to determine whether a fan or the exhaust pipe is faulty; and the differential pressure data are used to calculate a maintenance coefficient of the fan and the exhaust pipe, and according to the maintenance coefficient, a staff member can quickly handle and maintain.

Description

Technical Field

[0001] This invention relates to the field of electronic pressure switch technology, and more specifically to the field of differential pressure sensors based on the MEMS thermal principle. Background Technology

[0002] In recent years, the safety performance of gas water heaters has received increasing attention and importance from manufacturers and users. The stability and reliability of key components of gas water heaters are crucial for their safety. The air pressure switch is one of the safety devices in gas appliances such as gas water heaters, wall-hung boilers, and gas boilers. Its function is to detect whether the gas passage is blocked or damaged, ensuring that the gas passage is shut off in time if the exhaust volume is insufficient, thus preventing carbon monoxide poisoning accidents caused by the incomplete combustion of gas and the inability to expel exhaust gases such as carbon monoxide.

[0003] GB6932-2001, "Household Gas Instantaneous Water Heaters," stipulates in Article 6 that forced-draft water heaters should have safety devices for excessive wind pressure and flue blockage. Specifically: "Excessive Wind Pressure Safety Device: The safety device must not activate before the wind pressure reaches 80 Pa, and must close the gas passage to the burner before any flameout, backfire, flame overflow affecting use, or flame lift-off hindering use occurs. Flue Blockage Safety Device: The gas passage to the burner should be closed within 5 minutes and must not automatically reopen; there should be no flameout, backfire, flame overflow affecting use, or flame lift-off hindering use before closure."

[0004] Most commercially available gas water heaters use low-cost, traditional mechanical negative pressure switches. These are inexpensive and require no power supply. However, these mechanical pressure switches suffer from low sensitivity, slow response, and inherent mechanical wear on their moving parts, leading to a short lifespan and low measurement accuracy. These characteristics of traditional mechanical pressure switches pose certain safety hazards in gas applications. Summary of the Invention

[0005] The purpose of this invention is to solve the problems mentioned above in the background technology and to propose a high-precision, high-sensitivity electronic differential pressure flow switch.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] An electronic differential pressure flow switch includes the following steps:

[0008] The electronic flow differential pressure switch communicates with the main control system, which in turn communicates with the LED panel to display the detected exhaust pipe temperature and differential pressure values. The main control system also communicates with the ignition switch and the alarm.

[0009] Electronic flow differential pressure switches include:

[0010] The data acquisition module uses a thermal flow differential pressure sensor to obtain differential pressure data of the gas inside the exhaust pipe.

[0011] The monitoring module acquires the differential pressure value CY of each thermal flow differential pressure sensor. i Through formula The total differential pressure value CYz is calculated; CYi represents the differential pressure value of each thermal flow differential pressure sensor, and i represents the number of thermal flow differential pressure sensors, i = 1, 2, 3...n;

[0012] The obtained total differential pressure value CYz is compared with the total differential pressure threshold.

[0013] If the value is greater than 1, a normal signal for the fan is generated.

[0014] If the value is less than the specified value, a fan malfunction signal will be generated.

[0015] As a further aspect of the present invention: multiple thermal flow differential pressure sensors are arranged at equal intervals along the annular shape of the exhaust pipe.

[0016] As a further aspect of the present invention, it also includes:

[0017] The investigation module obtains the total differential pressure value CYz and constructs a set A{CYz1, CYz2, CYz3...CYz...} t}, obtain all subsets of set A, using the formula CCY = |CYz1-CYz2| + |CYz2-CYz3| + ... + |CYz t-1 -CYz t |, calculate the differential pressure value CCY; where t is the time node;

[0018] The obtained differential pressure value CCY is compared with the differential pressure threshold.

[0019] If the value is greater than 1, a signal indicating poor fan stability will be generated.

[0020] If it is less than 1, a signal indicating good fan stability will be generated.

[0021] As a further aspect of the present invention: obtaining the differential pressure value CY of each thermal flow differential pressure sensor. i The formula HCCY = |CY1-CY2| + |CY2-CY3| + ... + |CY i-1 -CY i | The differential pressure annular difference value HCCY was calculated;

[0022] The obtained differential pressure annular difference value HCCY is compared with the differential pressure annular difference threshold.

[0023] If the value is greater than 1, a signal indicating poor fan uniformity will be generated.

[0024] If it is less than 1, a signal indicating good uniformity of the fan will be generated.

[0025] As a further aspect of the present invention, it also includes:

[0026] If the signal processing module simultaneously obtains both the fan stability good signal and the fan uniformity good signal, it indicates that there is a fault in the exhaust pipe, and then generates an exhaust pipe maintenance signal.

[0027] If any combination of signals other than the "good fan stability" and "good fan uniformity" signals is obtained, it indicates that there is a fault in the fan, and a fan maintenance signal will be generated.

[0028] As a further aspect of the present invention, it also includes:

[0029] The maintenance module, within a preset time, uses a formula... The calculated wind turbine fault value ZFG; where a1 and a2 are both proportional coefficients;

[0030] Compare the fan fault value ZFG with the fan fault threshold; count the number of faults where the fan fault value ZFG is greater than or equal to the fan fault threshold as CSf; when the fan fault value ZFG is greater than or equal to the fan fault threshold, obtain the difference between the fan fault value ZFG and the fan fault threshold and sum them to obtain the total fan impact value ZPf.

[0031] Substitute the obtained failure count CSf and total impact value ZPf into the formula. In the calculation, the maintenance coefficient Xf of the wind turbine is obtained; where a3 and a4 are both proportional coefficients.

[0032] As a further aspect of the present invention: the differential pressure difference value CCY is obtained within a preset time; the exhaust pipe fault value ZQG is calculated using the formula ZQG=b1*(CCY-CCYB), where b1 is a proportionality coefficient;

[0033] Compare the exhaust pipe fault value ZQG with the exhaust pipe fault threshold; count the number of faults where the exhaust pipe fault value ZQG ≥ the exhaust pipe fault threshold as CSg; when the exhaust pipe fault value ZQG ≥ the exhaust pipe fault threshold, obtain the difference between the exhaust pipe fault value ZQG and the exhaust pipe fault threshold and sum them to obtain the total exhaust pipe impact value ZPg.

[0034] Substitute the obtained failure count CSg and total exhaust pipe impact value ZPg into the formula. In the calculation, the exhaust pipe maintenance coefficient Xg is obtained; where b2 and b3 are both proportional coefficients.

[0035] As a further aspect of the present invention: when the exhaust pipe fault value ZQG is positive, it indicates that the exhaust pipe has a blockage fault; when the exhaust pipe fault value ZQG is negative, it indicates that the exhaust pipe has a leakage fault.

[0036] The beneficial effects of this invention are:

[0037] This invention acquires differential pressure data of the exhaust pipe through a thermal flow differential pressure sensor, and then performs a comprehensive analysis of the differential pressure data, followed by separate analysis in terms of time and space, to determine whether there is a fault in the fan or the exhaust pipe.

[0038] Then, the maintenance coefficients for the fan and exhaust pipe are calculated using the differential pressure data. Based on the size of the maintenance coefficient, the staff can quickly carry out maintenance.

[0039] The electronic differential pressure flow switch of this invention is a mass flow switch, which is not affected by temperature or air pressure. With the help of software settings, it can achieve precise monitoring and rapid control of the air pressure switch, and can accurately set different negative pressure thresholds according to different situations. Attached Figure Description

[0040] The invention will now be further described with reference to the accompanying drawings.

[0041] Figure 1 This is a system block diagram of the present invention. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Please see Figure 1 As shown, the present invention is an electronic differential pressure flow switch, including an electronic flow differential pressure switch, a main control system, and a PC display panel;

[0044] The electronic flow differential pressure switch communicates with the main control system, which in turn communicates with the LED panel, displaying the detected exhaust pipe temperature and differential pressure values ​​on the LED panel. The main control system also communicates with the ignition switch and the alarm.

[0045] When the pressure difference detected by the electronic flow differential pressure switch is lower than the threshold range, the fan is considered to be operating normally, and a signal is sent to the pulse igniter. Ignition then ignites the gas. Conversely, when the pressure difference across the air pressure switch is higher than the threshold range, the controller considers the fan to be abnormal, stops ignition, and issues an alarm.

[0046] Example 2

[0047] Based on the above embodiment 1, the electronic flow differential pressure switch includes:

[0048] The data acquisition module uses a thermal flow differential pressure sensor to obtain differential pressure data of the gas inside the exhaust pipe.

[0049] Multiple thermal flow differential pressure sensors can be arranged at equal intervals along the annular shape of the exhaust pipe. The differential pressure value of each thermal flow differential pressure sensor will be obtained and marked as CYi, where i represents the number of thermal flow differential pressure sensors, i = 1, 2, 3...n;

[0050] Among these advancements, a thermal flow sensor differential pressure sensor is used to replace the traditional mechanical wind pressure switch. The MEMS thermal flow sensor is a flow sensor implemented using micro-nano technology based on the principle of heat exchange. By being encapsulated in a micro-channel, it can achieve ultra-low differential pressure (<0.1Pa), ultra-high sensitivity (<0.01Pa), fast response (millisecond level), and precise continuous differential pressure control. Furthermore, since the thermal mass flow sensor measures mass flow, it is not affected by gas temperature and can identify micro-leakage and micro-blockage problems in the exhaust pipe, greatly improving the safety of gas equipment.

[0051] The monitoring module acquires the differential pressure value CY of each thermal flow differential pressure sensor. i Analyze the detected data;

[0052] The specific working process of this monitoring module is as follows:

[0053] Step 1: Obtain the differential pressure value CY for each thermal flow differential pressure sensor. i Through formula The total differential pressure CYz is calculated.

[0054] Step 2: Compare the obtained total differential pressure value CYz with the total differential pressure threshold;

[0055] If the total differential pressure value CYz is greater than the total differential pressure threshold, a normal signal for the fan is generated.

[0056] If the total differential pressure value CYz is less than the total differential pressure threshold, a fan malfunction signal is generated;

[0057] When the troubleshooting module receives an abnormal fan signal from the monitoring module, it acquires the differential pressure value CY of each thermal flow differential pressure sensor in the acquisition module. i Further troubleshooting and analysis will be conducted.

[0058] The specific working process of this analysis module is as follows:

[0059] Step 1: Obtain the total differential pressure value CYz and construct a set A{CYz1, CYz2, CYz3...CYz t}, obtain all subsets of set A, using the formula CCY = |CYz1-CYz2| + |CYz2-CYz3| + ... + |CYz t-1 -CYz t |, calculate the differential pressure value CCY; where t is the time node;

[0060] The obtained differential pressure value CCY is compared with the differential pressure threshold.

[0061] If the differential pressure difference value CCY is greater than the differential pressure difference threshold, it indicates that the fan power fluctuates significantly during the historical detection period, generating a poor fan stability signal.

[0062] If the differential pressure difference value CCY is less than the differential pressure difference threshold, it indicates that the fan power fluctuation is relatively small during the historical detection period, generating a signal indicating good fan stability.

[0063] Step 2: Obtain the differential pressure value CY for each thermal flow differential pressure sensor. i The formula HCCY = |CY1-CY2| + |CY2-CY3| + ... + |CY i-1 -CY i | The differential pressure annular difference value HCCY was calculated;

[0064] The obtained differential pressure annular difference value HCCY is compared with the differential pressure annular difference threshold.

[0065] If the differential pressure ring difference value HCCY is greater than the differential pressure ring difference threshold, it indicates that the fans are on the same plane and the differential pressure difference is large, generating a poor fan uniformity signal.

[0066] If the differential pressure ring difference value HCCY is less than the differential pressure ring difference threshold, it indicates that the fans are on the same plane and the differential pressure difference is small, generating a signal of good fan uniformity.

[0067] The signal processing module acquires the poor fan stability signal, good fan stability signal, poor fan uniformity signal, and good fan uniformity signal from the troubleshooting module, and performs cross-processing on these signals.

[0068] The specific working process of this signal processing module is as follows:

[0069] Step 1: If both the fan stability signal and the fan uniformity signal are obtained simultaneously, it indicates that there is a fault in the exhaust pipe, and an exhaust pipe maintenance signal is generated.

[0070] Step 2: If a combination of signals other than the fan stability good signal and the fan uniformity good signal is obtained, it indicates that there is a fault in the fan, and a fan maintenance signal is generated.

[0071] The maintenance module acquires the exhaust pipe maintenance signal and the fan maintenance signal from the signal processing module, and completes the maintenance work accordingly.

[0072] The specific working process of this maintenance module is as follows:

[0073] Step 1: Within a preset time period, obtain the differential pressure difference value CCY and the differential pressure annular difference value HCCY, and then use the formula... The calculated wind turbine fault value ZFG; where a1 and a2 are both proportional coefficients, with a1 taking a value of 1.8 and a2 taking a value of 1.2;

[0074] Compare the fan fault value ZFG with the fan fault threshold; count the number of faults where the fan fault value ZFG is greater than or equal to the fan fault threshold as CSf; when the fan fault value ZFG is greater than or equal to the fan fault threshold, obtain the difference between the fan fault value ZFG and the fan fault threshold and sum them to obtain the total fan impact value ZPf.

[0075] Substitute the obtained failure count CSf and total impact value ZPf into the formula. In the calculation, the wind turbine maintenance coefficient Xf is obtained; where a3 and a4 are both proportionality coefficients, with a3 taking a value of 0.3 and a4 taking a value of 0.8.

[0076] Step 2: Obtain the differential pressure value CCY within a preset time; calculate the exhaust pipe fault value ZQG using the formula ZQG=b1*(CCY-CCYB), where b1 is the proportional coefficient and its value is 1.36.

[0077] When the exhaust pipe fault value ZQG is positive, it indicates that the exhaust pipe is blocked; when the exhaust pipe fault value ZQG is negative, it indicates that the exhaust pipe is leaking.

[0078] Compare the exhaust pipe fault value ZQG with the exhaust pipe fault threshold; count the number of faults where the exhaust pipe fault value ZQG ≥ the exhaust pipe fault threshold as CSg; when the exhaust pipe fault value ZQG ≥ the exhaust pipe fault threshold, obtain the difference between the exhaust pipe fault value ZQG and the exhaust pipe fault threshold and sum them to obtain the total exhaust pipe impact value ZPg.

[0079] Substitute the obtained failure count CSg and total exhaust pipe impact value ZPg into the formula. In the calculation, the exhaust pipe maintenance coefficient Xg is obtained; where b2 and b3 are both proportionality coefficients, with b2 taking a value of 0.5 and b3 taking a value of 1.3;

[0080] The severity of equipment failure is indicated by the maintenance coefficients Xf and Xg of the fan and exhaust pipe. The larger the absolute value of the maintenance coefficient, the higher the degree of danger of the failure; the smaller the absolute value of the maintenance coefficient, the lower the degree of danger of the failure.

[0081] The working principle of this invention is as follows: This invention obtains differential pressure data of the exhaust pipe through a thermal flow differential pressure sensor, and then performs overall comprehensive analysis on the differential pressure data, and then performs separate analysis in terms of time and space to determine whether there is a fault in the fan or the exhaust pipe.

[0082] The maintenance coefficients for the fan and exhaust pipe are then calculated using the differential pressure data. Based on the size of the maintenance coefficient, staff can quickly carry out maintenance.

[0083] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. An electronic differential pressure flow switch characterized by : The electronic flow differential pressure switch is in communication connection with the main control system, the main control system is in communication connection with the LED panel, and the exhaust pipe temperature and the exhaust pipe differential pressure value detected are displayed on the LED panel. The main control system is also in communication connection with an ignition switch and an alarm respectively. The electronic flow differential pressure switch comprises: The acquisition module acquires the differential pressure data of the gas in the exhaust pipe by using a thermal flow differential pressure sensor. A monitoring module acquires the differential pressure value CY of each thermal flow differential pressure sensor i , and calculates the total differential pressure value CYz through the formula ; CYi represents the differential pressure value of each thermal flow differential pressure sensor, i represents the number of thermal flow differential pressure sensors, i = 1, 2, 3...n; The thermal flow differential pressure sensor is arranged at multiple equal intervals along the annular exhaust pipe. The obtained differential pressure total value CYz is compared with a differential pressure total threshold value. If greater, a normal fan signal is generated. If smaller, an abnormal fan signal is generated. The troubleshooting module obtains the total differential pressure value CYz and constructs a set A {CYz1, CYz2, CYz3... CYz t}, obtains all subsets in the set A, and calculates a differential pressure difference value CCY through a formula ; wherein t is a time node. The obtained differential pressure difference value CCY is compared with a differential pressure difference threshold value. If greater, a poor fan stability signal is generated. If smaller, a good fan stability signal is generated. Obtaining the differential pressure value CY of each thermal flow differential pressure sensor i , the differential pressure ring differential value HCCY is calculated by formula , the differential pressure ring differential value HCCY is calculated by formula The obtained differential pressure annular difference value HCCY is compared with a differential pressure annular difference threshold value. If greater, a poor fan uniformity signal is generated. If smaller, a good fan uniformity signal is generated. The signal processing module, if the good fan stability signal and the good fan uniformity signal are acquired at the same time, indicates that the exhaust pipe has a fault, and an exhaust pipe maintenance signal is generated. If other signal combinations are acquired except the good fan stability signal and the good fan uniformity signal, it indicates that the fan has a fault, and a fan maintenance signal is generated. The fan fault value ZFG is compared with a fan fault threshold value; the number of times that the fan fault value ZFG is greater than or equal to the fan fault threshold value is counted as CSf, and when the fan fault value ZFG is greater than or equal to the fan fault threshold value, the difference between the fan fault value ZFG and the fan fault threshold value is obtained and summed to obtain a fan influence total value ZPf.

2. An electronic differential pressure flow switch according to claim 1, characterized in that The exhaust pipe fault value ZQG is compared with an exhaust pipe fault threshold value; the number of times that the exhaust pipe fault value ZQG is greater than or equal to the exhaust pipe fault threshold value is counted as CSg, and when the exhaust pipe fault value ZQG is greater than or equal to the exhaust pipe fault threshold value, the difference between the exhaust pipe fault value ZQG and the exhaust pipe fault threshold value is obtained and summed to obtain an exhaust pipe influence total value ZPg. The maintenance module calculates a fan fault value ZFG within a preset time through a formula ; wherein, a1 and a2 are both proportional coefficients. When the exhaust pipe fault value ZQG is positive, it indicates that the exhaust pipe has a blockage fault, and when the exhaust pipe fault value ZQG is negative, it indicates that the exhaust pipe has a leakage fault. The obtained fault times CSf and the influence total value ZPf are substituted into formula to calculate the fan maintenance coefficient Xf; wherein a3 and a4 are proportional coefficients.

3. An electronic differential pressure flow switch according to claim 2, wherein, In a preset time, a differential pressure difference value CCY is acquired; and an exhaust pipe fault value ZQG is calculated through a formula , where b1 is a proportional coefficient. ​ The obtained failure times CSg and the total value of exhaust pipe influence ZPg are substituted into formula to calculate the exhaust pipe maintenance coefficient Xg; wherein b2 and b3 are proportional coefficients.

4. An electronic differential pressure flow switch according to claim 3, wherein, ​

Images