Supporting and protecting device for electrical wiring of thermal power plant

Abstract

The invention provides an electrical wiring supporting and protecting device for a thermal power plant, and relates to the technical field of thermal power plants, the electrical wiring supporting and protecting device comprises a base, universal wheels are rotatably mounted at the lower end of the base, a transmission screw rod is rotatably mounted at the upper end of the base, a hand wheel is rotatably mounted at the upper end of a top plate, and a lifting table is movably mounted on the outer side of a stand column; a first sliding groove is formed in the surface of the lifting table, a movable frame is arranged in the first sliding groove, and a wire clamping mechanism is arranged at the upper end of the fixed base and the upper end of the movable base. The wire clamping mechanism is arranged at the upper ends of the fixed seat and the movable seat, so that the problems that an existing thermal power plant electrical wiring supporting and protecting device adopts an insulating rod with a clamping function, although the insulating rod can play a supporting and protecting role, the structure is simple, multiple groups of cables cannot be clamped at the same time, and the supporting and protecting effect is poor are solved. And the distance between the cables cannot be adjusted, so that the use is inconvenient.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power plants, in particular to an electrical wiring support and protection device for thermal power plants. Background Art

[0002] A thermal power plant is a factory that uses combustible materials as fuel to produce electricity. Its basic production process is: when the fuel burns, it heats water to generate steam, converting the chemical energy of the fuel into thermal energy. The steam pressure drives the turbine to rotate, converting the thermal energy into mechanical energy. The turbine then drives the generator to rotate, converting the mechanical energy into electrical energy. Electrical equipment in thermal power plants occasionally malfunction during use. Since most cables in thermal power plants are large in size, when the cables of electrical equipment are disconnected, wiring support protection devices are required to assist in supporting the cables and prevent the cables from endangering maintenance personnel, thereby playing a protective role.

[0003] Nowadays, most of the electrical wiring support and protection devices for thermal power plants, such as the invention patent CN 221353746U, a thermal power plant electrical wiring support and protection device, adopt an insulating rod with a clamping function. Although it can play a supporting and protective role, it has a simple structure and cannot clamp multiple groups of cables at the same time, and cannot adjust the distance between the cables, which is inconvenient to use. Therefore, in view of the above situation, it is urgent to develop an electrical wiring support and protection device for thermal power plants to overcome the shortcomings in current practical applications. Summary of the invention

[0004] The present invention provides an electrical wiring support and protection device for a thermal power plant, which is used to solve the problem that the existing electrical wiring support and protection devices for thermal power plants mentioned above all adopt insulating rods with clamping functions, which can play a supporting and protective role, but have a simple structure, cannot clamp multiple groups of cables at the same time, and cannot adjust the distance between the cables, which is inconvenient to use.

[0005] In order to solve the above technical problems, the present invention discloses an electrical wiring support and protection device for a thermal power plant, comprising a base, a universal wheel is rotatably mounted on the lower end of the base, a handle and a column are fixedly mounted on the upper end of the base, a top plate is fixedly mounted on the upper end of the column, a transmission screw is rotatably mounted on the upper end of the base, a hand wheel is rotatably mounted on the upper end of the top plate, a lifting platform is movably mounted on the outer side of the column, a slide groove 1 is provided on the surface of the lifting platform, a movable frame is arranged inside the slide groove 1, and slots are provided on both sides of the movable frame The lower end of the lifting platform is rotatably installed with a bidirectional screw rod through the bracket, and a knob is fixedly installed at one end of the bidirectional screw rod, and a connecting sleeve is fixedly installed at the lower end of the movable frame. A second slide groove is opened at the upper end of the movable frame, and a fixed seat is fixedly installed on the inner side of the second slide groove, and a movable seat is movably installed on the inner side of the second slide groove. A clamping screw is threadedly connected to the lower end of the movable seat, and a connecting groove is opened at the lower end of the movable frame. A wire clamping mechanism is arranged at the upper ends of the fixed seat and the movable seat, and the wire clamping mechanism includes a fixed frame, an adjusting screw and a pressing block.

[0006] Preferably, four universal wheels are symmetrically arranged, two upright posts are symmetrically arranged, and the handle and the upright posts are located on both sides of the upper end of the base.

[0007] Preferably, the transmission screw is parallel to the column, the transmission screw is fixedly connected to the hand wheel, and the lifting platform is threadedly connected to the outer side of the transmission screw.

[0008] Preferably, two slide grooves are symmetrically arranged, the clamping groove is movably connected to the lifting platform, and the connecting sleeve is threadedly connected to the outer side of the bidirectional screw rod.

[0009] Preferably, the movable seat is provided with one on each side of the fixed seat, the clamping screw passes through the connecting groove, and the clamping screw is fitted with the lower end of the movable frame.

[0010] Preferably, the fixing frame is fixedly mounted on the upper ends of the fixing seat and the movable seat respectively, and the inner side of the fixing frame is an arc-shaped structure.

[0011] Preferably, the adjusting screw is threadedly connected to the upper end of the fixing frame, the pressing block is rotatably mounted on the lower end of the adjusting screw, the pressing block is fitted with the inner side of the fixing frame, and the lower end of the pressing block is an arc-shaped structure.

[0012] Preferably, an electrical wiring cooling device is also fixedly installed on the lifting platform, and the electrical wiring cooling device consists of a cooling fan, a connecting pipe and a nozzle, and the cooling fan is connected to the nozzle through the connecting pipe, and the electrical wiring cooling device also includes:

[0013] Temperature sensor 1, used to detect the temperature at the wire clamping mechanism;

[0014] Temperature sensor 2, used to detect the temperature of cooling gas at the nozzle outlet;

[0015] Air pressure sensor 1, used to detect the pressure of the gas in the connecting pipe;

[0016] Air pressure sensor 2, used to detect the pressure of the gas at the nozzle outlet;

[0017] An alarm and a controller are provided, wherein the alarm and the controller are electrically connected to the temperature sensor 1 and the temperature sensor 2, and the air pressure sensor 1 and the air pressure sensor 2.

[0018] Preferably, the controller controls the alarm to work based on the temperature sensor 1 and the temperature sensor 2, the air pressure sensor 1 and the air pressure sensor 2, including the following steps:

[0019] Step 1: Calculate the nozzle outflow coefficient K based on formula (1) and the detection values ​​of temperature sensor 1 and temperature sensor 2:

[0020]

[0021] Where ρ is the density of the gas blown out by the cooling fan, V is the speed of the gas ejected from the nozzle, R is the radius of the nozzle, T1 is the detection value of temperature sensor 1, T2 is the detection value of temperature sensor 2, Re is the gas Reynolds number, and μ is the dynamic viscosity of the gas;

[0022] Step 2: According to the following formula (2) and the detection values ​​of the air pressure sensor 1 and the air pressure sensor 2, the actual fluid volume Q of the gas passing through the connecting pipe per unit time is calculated. The controller compares the actual fluid volume Q of the gas passing through the connecting pipe per unit time with the preset fluid volume range. When the actual fluid volume is lower than the preset fluid volume range, the controller controls the alarm to sound an alarm:

[0023]

[0024] Where S is the nozzle outlet flow cross-sectional area, α is the ratio of the nozzle outlet diameter to the connecting pipe diameter, P1 is the detection value of the air pressure sensor 2, P2 is the detection value of the air pressure sensor 1, P d is the standard atmospheric pressure, and λ is the gas constant.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention provides a lifting platform with two movable frames on it. Each movable frame is provided with three wire clamping mechanisms, which can clamp three groups of cables at the same time. When in use, the hand wheel is turned to drive the lifting platform to move up and down to adjust the height of the wire clamping mechanism, so that the device is suitable for electrical equipment at different heights. The knob is turned to drive the movable frame to move in the opposite direction to adjust the relative cable spacing. The clamping screw is loosened and the movable seat is moved to adjust the spacing between adjacent cables. Compared with traditional wiring support and protection devices, the device has higher adjustability and is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of a three-dimensional structure provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the three-dimensional structure of a lifting platform provided in an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of a three-dimensional structure of a movable frame provided by an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of the three-dimensional structure of a wire clamping mechanism provided in an embodiment of the present invention.

[0032] In the figure: 1. base; 2. universal wheel; 3. handle; 4. column; 5. top plate; 6. transmission screw; 7. handwheel; 8. lifting platform; 9. slide slot 1; 10. movable frame; 11. slot; 12. two-way screw; 13. knob; 14. connecting sleeve; 15. slide slot 2; 16. fixed seat; 17. movable seat; 18. clamping screw; 19. connecting slot; 20. wire clamping mechanism; 2001. fixed frame; 2002. adjusting screw; 2003. pressing block. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] The present invention provides the following embodiments

[0036] Example 1

[0037] See also Figure 1 In the figure, a supporting and protecting device for electrical wiring in a thermal power plant comprises a base 1, a universal wheel 2 is rotatably mounted on the lower end of the base 1, a handle 3 and a column 4 are fixedly mounted on the upper end of the base 1, a top plate 5 is fixedly mounted on the upper end of the column 4, a transmission screw 6 is rotatably mounted on the upper end of the base 1, a hand wheel 7 is rotatably mounted on the upper end of the top plate 5, a lifting platform 8 is movably mounted on the outer side of the column 4, a slide groove 9 is provided on the surface of the lifting platform 8, a movable frame 10 is provided inside the slide groove 9, and slots 11 are provided on both sides of the movable frame 10, and a two-way movable frame 10 is rotatably mounted on the lower end of the lifting platform 8 through a bracket. A screw rod 12, a knob 13 is fixedly installed at one end of the bidirectional screw rod 12, a connecting sleeve 14 is fixedly installed at the lower end of the movable frame 10, a slide groove 15 is opened at the upper end of the movable frame 10, a fixed seat 16 is fixedly installed on the inner side of the slide groove 15, a movable seat 17 is movably installed on the inner side of the slide groove 15, a clamping screw 18 is threadedly connected to the lower end of the movable seat 17, a connecting groove 19 is opened at the lower end of the movable frame 10, a wire clamping mechanism 20 is arranged at the upper ends of the fixed seat 16 and the movable seat 17, and the wire clamping mechanism 20 includes a fixed frame 2001, an adjusting screw 2002 and a pressing block 2003.

[0038] See also Figure 1 There are four universal wheels 2 symmetrically arranged, two columns 4 symmetrically arranged, and the handle 3 and the column 4 are located on both sides of the upper end of the base 1.

[0039] In this embodiment: by pushing the handle 3 , the base 1 moves via the universal wheels 2 , and the upright column 4 guides the lifting platform 8 .

[0040] See also Figure 1 The transmission screw rod 6 is parallel to the column 4, the transmission screw rod 6 is fixedly connected to the hand wheel 7, and the lifting platform 8 is threadedly connected to the outer side of the transmission screw rod 6.

[0041] In this embodiment: the hand wheel 7 is rotated to drive the transmission screw 6 to rotate, and the transmission screw 6 drives the lifting platform 8 to move up and down through the thread.

[0042] Working principle: First, push the handle 3, the base 1 moves through the universal wheel 2, the column 4 guides the lifting platform 8, turn the handwheel 7 to drive the transmission screw 6 to rotate, and the transmission screw 6 drives the lifting platform 8 up and down through the thread. When the lifting platform 8 is adjusted to a suitable height, the cables to be wired are placed in the fixed frames 2001 on both sides, and the adjusting screw 2002 is rotated downward to drive the pressing block 2003 to move inside the fixed frame 2001 through the thread. The pressing block 2003 presses and fixes the cables, and then the wiring operation can be carried out. The three groups of cables are clamped, and the clamping screw 18 is rotated downward to unlock the movable seat 17. The movable seat 17 moves horizontally along the slide groove 15. The clamping screw 18 is rotated upward to fit with the lower end of the movable frame 10, which clamps and positions the movable seat 17 to achieve distance adjustment between the cables. When the distance between the cables needs to be adjusted, the knob 13 is turned to drive the bidirectional screw rod 12 to rotate, and the bidirectional screw rod 12 drives the two movable frames 10 to slide in opposite directions along the inner side of the slide groove 9. The cables move with the movable frame 10, and the relative cable spacing is adjusted, which is more convenient to use.

[0043] Example 2

[0044] See also Figure 1 There are two symmetrical slide grooves 9, the card slot 11 is movably connected to the lifting platform 8, and the connecting sleeve 14 is threadedly connected to the outer side of the bidirectional screw rod 12.

[0045] In this embodiment, the rotating knob 13 drives the bidirectional screw rod 12 to rotate, and the bidirectional screw rod 12 drives the two movable frames 10 to slide in opposite directions along the inner side of the slide groove 9.

[0046] See also Figure 1 The movable seat 17 is provided with one on each side of the fixed seat 16 , and the clamping screw 18 passes through the connecting groove 19 , and the clamping screw 18 is fitted with the lower end of the movable frame 10 .

[0047] In this embodiment, the clamping screw 18 is rotated downward to unlock the movable seat 17, and the movable seat 17 moves horizontally along the second slide groove 15. The clamping screw 18 is rotated upward to fit with the lower end of the movable frame 10, thereby clamping and positioning the movable seat 17.

[0048] See also Figure 1 A fixed frame 2001 is fixedly installed on the upper end of the fixed seat 16 and the movable seat 17 respectively, and the inner side of the fixed frame 2001 is an arc structure.

[0049] In this embodiment: the cables are placed inside the fixing frame 2001 .

[0050] See also Figure 1 The adjusting screw 2002 is threadedly connected to the upper end of the fixing frame 2001, and the pressing block 2003 is rotatably installed on the lower end of the adjusting screw 2002. The pressing block 2003 is fitted with the inner side of the fixing frame 2001, and the lower end of the pressing block 2003 is an arc structure.

[0051] In this embodiment, the adjusting screw 2002 is rotated downward, and the pressing block 2003 is driven to move inside the fixing frame 2001 through the thread, and the pressing block 2003 presses and fixes the cable.

[0052] Example 3

[0053] On the basis of Embodiment 1-2, an electrical wiring cooling device is further fixedly mounted on the lifting platform 8, the electrical wiring cooling device is composed of a cooling fan, a connecting pipe and a nozzle, and the cooling fan is connected to the nozzle through the connecting pipe, and the electrical wiring cooling device also includes:

[0054] Temperature sensor 1, used to detect the temperature of the wire clamping mechanism 20;

[0055] Temperature sensor 2, used to detect the temperature of cooling gas at the nozzle outlet;

[0056] Air pressure sensor 1, used to detect the pressure of the gas in the connecting pipe;

[0057] Air pressure sensor 2, used to detect the pressure of the gas at the nozzle outlet;

[0058] An alarm and a controller are provided, wherein the alarm and the controller are electrically connected to the temperature sensor 1 and the temperature sensor 2, and the air pressure sensor 1 and the air pressure sensor 2.

[0059] In this embodiment: the controller controls the alarm to work based on the temperature sensor 1 and the temperature sensor 2, the air pressure sensor 1 and the air pressure sensor 2, including the following steps:

[0060] Step 1: Calculate the nozzle outflow coefficient K based on formula (1) and the detection values ​​of temperature sensor 1 and temperature sensor 2:

[0061]

[0062] Where ρ is the density of the gas blown out by the cooling fan, V is the speed of the gas ejected from the nozzle, R is the radius of the nozzle, T1 is the detection value of temperature sensor 1, T2 is the detection value of temperature sensor 2, Re is the gas Reynolds number, and μ is the dynamic viscosity of the gas;

[0063] Step 2: According to the following formula (2) and the detection values ​​of the air pressure sensor 1 and the air pressure sensor 2, the actual fluid volume Q of the gas passing through the connecting pipe per unit time is calculated. The controller compares the actual fluid volume Q of the gas passing through the connecting pipe per unit time with the preset fluid volume range. When the actual fluid volume is lower than the preset fluid volume range, the controller controls the alarm to sound an alarm:

[0064]

[0065] Where S is the nozzle outlet flow cross-sectional area, α is the ratio of the nozzle outlet diameter to the connecting pipe diameter, P1 is the detection value of the air pressure sensor 2, P2 is the detection value of the air pressure sensor 1, P d is the standard atmospheric pressure, λ is the gas constant, Indicates the air compressibility factor.

[0066] The beneficial effect of the above technical solution is that the controller calculates the nozzle outflow coefficient based on the formula (1), the detection values ​​of temperature sensor 1 and temperature sensor 2, and comprehensively considers the density of the gas blown out by the cooling fan, the speed of the gas ejected from the nozzle, the radius of the nozzle, the gas Reynolds number, and the dynamic viscosity of the gas, so that the calculation result is more accurate and reliable;

[0067] Then, according to formula (2) and the detection values ​​of pressure sensor 1 and pressure sensor 2, the nozzle outlet flow cross-sectional area, the ratio of the nozzle outlet diameter to the connecting pipe diameter, the standard atmospheric pressure, and the gas constant, the actual fluid volume of the gas passing through the connecting pipe per unit time is calculated, thereby making the calculation result more accurate and reliable.

[0068] The controller controls the alarm based on temperature sensor 1 and temperature sensor 2, air pressure sensor 1 and air pressure sensor 2. The controller compares the actual fluid volume of the gas passing through the connecting pipe per unit time with the preset fluid volume range. When the actual fluid volume is lower than the preset fluid volume range, the controller controls the alarm to sound, reminding the staff to increase the output power of the cooling fan in time. When the actual fluid volume of the gas passing through the connecting pipe per unit time is still lower than the preset fluid volume range after the output power is increased, the cooling fan is repaired or replaced to enable it to operate normally, thereby meeting the user's demand for this type of electrical wiring support and protection device for thermal power plants.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A supporting and protecting device for electrical wiring in a thermal power plant, comprising a base (1), characterized in that: The lower end of the base (1) is rotatably mounted with a universal wheel (2); the upper end of the base (1) is fixedly mounted with a handle (3) and a column (4); the upper end of the column (4) is fixedly mounted with a top plate (5); the upper end of the base (1) is rotatably mounted with a transmission screw (6); the upper end of the top plate (5) is rotatably mounted with a hand wheel (7); the outer side of the column (4) is movably mounted with a lifting platform (8); a slide groove (9) is provided on the surface of the lifting platform (8); a movable frame (10) is provided inside the slide groove (9); both sides of the movable frame (10) are provided with card slots (11); the lower end of the lifting platform (8) is rotatably mounted with a bidirectional screw rod (12) through a bracket; the bidirectional screw rod (12) is rotatably mounted on the lower end of the lifting platform (8); 2) is fixedly mounted with a knob (13), the lower end of the movable frame (10) is fixedly mounted with a connecting sleeve (14), the upper end of the movable frame (10) is provided with a second slide groove (15), the inner side of the second slide groove (15) is fixedly mounted with a fixed seat (16), the inner side of the second slide groove (15) is movably mounted with a movable seat (17), the lower end of the movable seat (17) is threadedly connected with a clamping screw (18), the lower end of the movable frame (10) is provided with a connecting groove (19), the upper ends of the fixed seat (16) and the movable seat (17) are provided with a wire clamping mechanism (20), and the wire clamping mechanism (20) comprises a fixed frame (2001), an adjusting screw (2002) and a pressing block (2003).

2. The electrical wiring support and protection device for a thermal power plant according to claim 1, characterized in that: The four universal wheels (2) are symmetrically arranged, the two upright posts (4) are symmetrically arranged, and the handle (3) and the upright posts (4) are located on both sides of the upper end of the base (1).

3. The electrical wiring support and protection device for a thermal power plant according to claim 1, characterized in that: The transmission screw (6) is parallel to the column (4), the transmission screw (6) is fixedly connected to the hand wheel (7), and the lifting platform (8) is threadedly connected to the outer side of the transmission screw (6).

4. The electrical wiring support and protection device for a thermal power plant according to claim 1, characterized in that: The first slide groove (9) is symmetrically arranged with two members, the clamping groove (11) is movably connected to the lifting platform (8), and the connecting sleeve (14) is threadedly connected to the outer side of the bidirectional screw rod (12).

5. The electrical wiring support and protection device for a thermal power plant according to claim 1, characterized in that: The movable seat (17) is respectively provided with one on both sides of the fixed seat (16), the clamping screw (18) passes through the connecting groove (19), and the clamping screw (18) is fitted with the lower end of the movable frame (10).

6. The electrical wiring support and protection device for a thermal power plant according to claim 1, characterized in that: The fixed frame (2001) is fixedly mounted on the upper ends of the fixed seat (16) and the movable seat (17), respectively, and the inner side of the fixed frame (2001) is an arc-shaped structure.

7. The electrical wiring support and protection device for a thermal power plant according to claim 1, characterized in that: The adjusting screw (2002) is threadedly connected to the upper end of the fixing frame (2001), and the pressing block (2003) is rotatably mounted on the lower end of the adjusting screw (2002). The pressing block (2003) is fitted with the inner side of the fixing frame (2001), and the lower end of the pressing block (2003) is an arc-shaped structure.

8. The electrical wiring support and protection device for a thermal power plant according to claim 1, characterized in that: The lifting platform (8) is also fixedly mounted with an electrical wiring cooling device, the electrical wiring cooling device comprising a cooling fan, a connecting pipe and a nozzle, and the cooling fan is connected to the nozzle via the connecting pipe, and the electrical wiring cooling device further comprises: A temperature sensor 1, used for detecting the temperature at the wire clamping mechanism (20); Temperature sensor 2, used to detect the temperature of cooling gas at the nozzle outlet; Air pressure sensor 1, used to detect the pressure of the gas in the connecting pipe; Air pressure sensor 2, used to detect the pressure of the gas at the nozzle outlet; An alarm and a controller are electrically connected to the temperature sensor 1 and the temperature sensor 2, and the air pressure sensor 1 and the air pressure sensor 2.

9. The electrical wiring support and protection device for a thermal power plant according to claim 8, characterized in that: The controller controls the alarm to work based on the temperature sensor 1 and the temperature sensor 2, the air pressure sensor 1 and the air pressure sensor 2, including the following steps: Step 1: Calculate the nozzle outflow coefficient K based on formula (1) and the detection values ​​of temperature sensor 1 and temperature sensor 2: Where ρ is the density of the gas blown out by the cooling fan, V is the speed of the gas ejected from the nozzle, R is the radius of the nozzle, T1 is the detection value of temperature sensor 1, T2 is the detection value of temperature sensor 2, Re is the gas Reynolds number, and μ is the dynamic viscosity of the gas; Step 2: According to the following formula (2) and the detection values ​​of the air pressure sensor 1 and the air pressure sensor 2, the actual fluid volume Q of the gas passing through the connecting pipe per unit time is calculated. The controller compares the actual fluid volume Q of the gas passing through the connecting pipe per unit time with the preset fluid volume range. When the actual fluid volume is lower than the preset fluid volume range, the controller controls the alarm to sound an alarm: Where S is the nozzle outlet flow cross-sectional area, α is the ratio of the nozzle outlet diameter to the connecting pipe diameter, P1 is the detection value of the air pressure sensor 2, P2 is the detection value of the air pressure sensor 1, P d is the standard atmospheric pressure, and λ is the gas constant.

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