Spray nozzle blockage detection method
By using variable diameter pipes and pressure sensors to detect pressure difference in the spray water supply pipeline, and combining this with linear regression to calculate the degree of nozzle blockage, the problem of inaccurate nozzle blockage detection in mines has been solved, enabling real-time monitoring and maintenance of the spray system.
Patent Information
- Application Number
- CN202411415641.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-01-07
AI Technical Summary
The nozzles of mine spray systems are prone to clogging, and existing detection methods are inaccurate and costly, which affects the dust suppression effect of spraying.
In a spray water supply pipeline, a variable diameter pipe is used. The pressure difference before and after the diameter change is detected by a pressure sensor. The variable diameter pipe is used to expand the pressure change benchmark value, and the degree of nozzle blockage is calculated by combining the linear regression method.
It improves the sensitivity of pressure change detection, enables real-time monitoring and accurate judgment of nozzle blockage, and ensures the normal operation of the spray system.
Smart Images
Figure CN119268753A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of mine dust prevention and relates to a spray nozzle blockage detection method. Background Art
[0002] In the mine dust prevention water supply system, the nozzles of the spray system are often blocked due to internal material deformation, nozzle corrosion, dirt or other impurities in the liquid, which affects the spray dust reduction effect. The impurity content of the mine spray water is high, which can easily cause nozzle blockage. Nozzle blockage is usually a gradual process. Mine workers use visual inspection to identify the blockage status of the nozzle, and the assessment of the degree of nozzle blockage is inaccurate, resulting in the failure to promptly discover and replace the spray system nozzle after blockage, which seriously affects the spray dust reduction effect.
[0003] There are three existing technologies to solve this problem:
[0004] 1. Designing anti-clogging nozzles, such as adding water filtration design, nozzle material optimization or pulse spray method, can reduce the degree of nozzle clogging.
[0005] 2. Detect the spray water flow rate. The nozzle blockage status of the spray system can be roughly judged by the size of the water flow in the spray water pipe. The impurity content of the mine water supply source is high, which can easily cause blockage of the flow measurement system. When the nozzle blockage degree is low, the flow change caused is small, and the reliability of the flow detection result is low.
[0006] 3. Nozzle blockage status detection based on acoustic signals. This method requires sophisticated detection equipment and is also costly, so it is not suitable for mine spray nozzle blockage detection. Summary of the invention
[0007] In view of this, an object of the present invention is to solve the above-mentioned problem and provide a method for detecting clogging of a spray nozzle.
[0008] In order to achieve the above object, the present invention provides the following technical solutions:
[0009] A method for detecting the blockage of a spray nozzle comprises: in a spray water supply pipeline, a pipe at a pressure change detection point is a reducer pipe, a pressure sensor is used to detect the pressure difference before and after the reducer pipe is reduced in diameter, and the reducer pipe is used to expand the reference value of the pressure change, thereby amplifying the pressure change amplitude caused by the nozzle blockage and improving the detection sensitivity of the pressure change.
[0010] Furthermore, the diameter D1 of the inlet pipe of the variable diameter pipe is greater than the diameter D2 of the outlet pipe, and D1>1.2D2.
[0011] Furthermore, when the nozzle is not blocked, a relatively obvious pressure difference reference value on the variable diameter pipe is first obtained through the pressure sensor.
[0012] Furthermore, under the condition that the water supply pressure P is fixed and the diameters D1 and D2 at both ends of the variable diameter pipe are determined, the relationship between the nozzle blockage degree and the pressure change is obtained through experiments and numerical analysis. The specific method is as follows:
[0013] S1. According to the demand, the water supply pressure P is constant, and the nozzle blockage degree PD is simulated to be 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and the measured pressure change ΔPi;
[0014] S2. The calculation formula for the nozzle blockage degree when the water supply pressure is P is obtained by linear regression method: PD = K*ΔP + B,
[0015] S3, changing the water supply pressure P, repeating the above process, and obtaining a nozzle blockage degree calculation curve under the water supply pressure P;
[0016] During the nozzle blockage detection process, when the water supply pressure is fixed, the nozzle blockage degree is calculated by measuring the pressure change of the variable diameter pipe and substituting it into the corresponding nozzle blockage degree calculation curve.
[0017] The beneficial effects of the present invention are:
[0018] 1. The present invention expands the base value of the pressure difference change through the variable diameter pipe, which can significantly amplify the amplitude of the pressure change caused by the nozzle blockage, so that the pressure sensor can more sensitively detect small pressure changes, thereby increasing the sensitivity of the pressure difference measurement.
[0019] 2. The present invention adopts a variable diameter pipe to improve the lower limit of nozzle blockage detection. At the same time, pressure detection can more easily adapt to mine water supply sources with higher impurities, and has higher applicability.
[0020] 3. The present invention can realize real-time monitoring of the nozzle blockage state. By measuring the pressure change of the variable diameter pipe in real time and combining it with the pre-established nozzle blockage degree calculation curve, the nozzle blockage degree can be quickly and accurately determined, and maintenance measures can be taken in time to ensure the normal operation of the spray system.
[0021] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:
[0023] Figure 1 This is a nozzle clogging detection device based on a pressure difference sensor in the present invention.
[0024] Figure 2 This is a nozzle clogging detection device based on two pressure sensors in the present invention.
[0025] Figure numerals: 1 - high pressure detection port; 2 - inlet pipe; 3 - differential pressure sensor; 4 - pressure conduit; 5 - outlet pipe; 6 - low pressure detection port. DETAILED DESCRIPTION
[0026] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.
[0027] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.
[0028] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is 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, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.
[0029] A method for detecting the blockage of a spray nozzle comprises: in a spray water supply pipeline, a pipe at a pressure change detection point is provided with a reducer pipe, the reducer pipe is used to expand the reference value of the pressure change, the pressure change on the spray water supply pipeline when the nozzle is blocked is detected, and the sensitivity of the pressure change is expanded by the reducer pipe.
[0030] The diameter D1 of the inlet pipe 2 of the variable diameter pipe is greater than the diameter D2 of the outlet pipe 5, and D1>1.2D2. When the nozzle is not blocked, a relatively obvious pressure difference reference value on the variable diameter pipe is obtained through the pressure sensor.
[0031] There are two ways to detect pressure changes:
[0032] 1. If Figure 1 As shown, a pressure difference sensor 3 is used to detect the pressure difference at both ends of the pipeline, a high-pressure detection port 1 is set at the large end of the variable-diameter pipeline, and a low-pressure detection port 6 is set at the small end. The high-pressure detection port 1 and the low-pressure detection port 6 are respectively connected to the high-pressure port and the low-pressure port of the pressure difference sensor 3 by a pressure conduit 4, and the pressure change on the pipeline is measured to be ΔP.
[0033] 2. If Figure 2 As shown, the pressure change of the pipeline is detected by two pressure sensors. A pressure sensor is installed at the small end and the large end of the variable diameter pipeline respectively. The pressure P1 is measured at the large end and the pressure P2 is measured at the small end. Then the pipeline water pressure change ΔP=P1-P2.
[0034] In the present invention, under the condition that the water supply pressure P is fixed and the diameters D1 and D2 at both ends of the variable diameter pipe are determined, the relationship between the nozzle blockage degree and the pressure change is obtained through experiments and numerical analysis. The specific method is:
[0035] S1. According to the demand, the water supply pressure P is constant, and the nozzle blockage degree PD is simulated to be 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and the measured pressure change ΔPi;
[0036] S2. The calculation formula for the nozzle blockage degree when the water supply pressure is P is obtained by linear regression method: PD = K*ΔP + B,
[0037] S3, changing the water supply pressure P, repeating the above process, and obtaining a nozzle blockage degree calculation curve under the water supply pressure P;
[0038] During the nozzle blockage detection process, when the water supply pressure is fixed, the nozzle blockage degree is calculated by measuring the pressure change of the variable diameter pipe and substituting it into the corresponding nozzle blockage degree calculation curve.
[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.
Claims
1. A method for detecting spray nozzle blockage, characterized in that: In the spray water supply pipeline, a reducing pipe is used at the pressure change detection point, and a pressure sensor is used to detect the pressure difference before and after the reducing pipe is changed in diameter. The reducing pipe is used to expand the reference value of the pressure change, thereby amplifying the pressure change amplitude caused by nozzle blockage and improving the detection sensitivity of the pressure change.
2. The spray nozzle clogging detection method according to claim 1, characterized in that: The diameter D1 of the inlet pipe of the variable diameter pipe is greater than the diameter D2 of the outlet pipe, and D1>1.2D2.
3. The spray nozzle clogging detection method according to claim 2, characterized in that: When the nozzle is not blocked, first obtain a more obvious pressure difference reference value on the variable diameter pipe through the pressure sensor.
4. The spray nozzle clogging detection method according to claim 1, characterized in that: Under the condition of fixed water supply pressure P and determined diameters D1 and D2 at both ends of the variable diameter pipe, the relationship between nozzle blockage degree and pressure change is obtained through experiments and numerical analysis. The specific method is as follows: S1. According to the demand, the water supply pressure P is constant, and the nozzle blockage degree PD is simulated to be 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and the measured pressure change ΔPi; S2. The calculation formula for the nozzle blockage degree when the water supply pressure is P is obtained by linear regression method: PD = K*ΔP + B, S3, changing the water supply pressure P, repeating the above process, and obtaining a nozzle blockage degree calculation curve under the water supply pressure P; During the nozzle blockage detection process, when the water supply pressure is fixed, the nozzle blockage degree is calculated by measuring the pressure change of the variable diameter pipe and substituting it into the corresponding nozzle blockage degree calculation curve.