A micro differential pressure switch for flue gas duct

Abstract

The present application relates to pressure switch technical field, especially to a kind of micro differential pressure switch for flue gas pipeline, comprising: shell, elastic diaphragm, ejector rod and switch unit;The shell is connected with sampling tube;The switch unit is installed in the shell;The ejector rod is slidably connected in the shell, and the ejector rod one end is in contact with the elastic diaphragm, the other end is in contact with switch unit;Radial offset mechanism is arranged in the shell;The radial offset mechanism is arranged around the ejector rod, and the radial offset mechanism senses the vibration of shell, when vibration is transmitted to ejector rod, opposite force is applied to vibration direction, and the radial vibration of ejector rod is offset;The present application is by being arranged piezoelectric sensing layer and piezoelectric action layer in shell, and piezoelectric sensing layer inducts transverse vibration and generates electric current to control unit, and the piezoelectric action layer of both sides pushes or pulls inner sleeve and ejector rod, so that ejector rod generates opposite movement to vibration direction, to offset vibration in transverse direction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure switch, in particular to a micro differential pressure switch for flue gas pipeline. BACKGROUND

[0002] The pressure switch is a device for detecting "absolute pressure, gauge pressure or negative pressure" and triggering switch action, which realizes the on or off of the circuit through mechanical or electronic structure when the measured pressure reaches the preset threshold, thereby controlling the start and stop of the device and issuing an alarm signal.

[0003] The flue gas pipeline (such as the flue of the boiler, incinerator and industrial kiln) usually has high temperature, smoke dust and corrosion, so the micro differential pressure switch for flue gas pipeline needs to be resistant to high temperature, corrosion and blockage.

[0004] When the flue gas pipeline is discharging flue gas, the rotation of the fan blade driven by the motor and the flow of the gas in the flue gas pipeline will cause the flue gas pipeline to vibrate, and when the pressure switch is installed on the flue gas pipeline, the vibration of the flue gas pipeline will drive the pressure switch to vibrate together, so that the detected pressure is not consistent with the actual value, thereby affecting the use of the micro differential pressure switch and causing limitations.

[0005] Therefore, we propose a micro differential pressure switch for flue gas pipeline. SUMMARY

[0006] In view of the shortcomings of the prior art, the present application provides a micro differential pressure switch for flue gas pipeline, which overcomes the shortcomings of the prior art and aims to solve the problems in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a micro differential pressure switch for flue gas pipeline, comprising:

[0008] a shell, an elastic diaphragm, a top rod and a switch unit; the shell is connected with a sampling pipe; the elastic diaphragm is installed in the shell; the switch unit is installed in the shell; the top rod is slidingly connected in the shell, one end of the top rod is in contact with the elastic diaphragm, and the other end is in contact with the switch unit;

[0009] A radial compensation mechanism is arranged in the shell; the radial compensation mechanism surrounds the top rod, and the radial compensation mechanism senses the vibration of the shell and applies a force opposite to the vibration direction when the vibration is transmitted to the top rod, thereby canceling the radial vibration of the top rod.

[0010] Preferably, the radial offset mechanism comprises an outer sleeve, an inner sleeve, a piezoelectric sensing layer and a piezoelectric action layer; the inner sleeve is sleeved outside the ejector rod; the outer sleeve is sleeved outside the inner sleeve; the inner sleeve is in sliding fit with the ejector rod; a separation sleeve is arranged between the outer sleeve and the inner sleeve; the piezoelectric sensing layer is located between the outer sleeve and the separation sleeve; the piezoelectric action layer is located between the inner sleeve and the separation sleeve.

[0011] A control unit is arranged in the shell; the piezoelectric sensing layer is in circuit connection with the control unit; the piezoelectric action layer is in circuit connection with the control unit.

[0012] By arranging the piezoelectric sensing layer and the piezoelectric action layer in the shell, the piezoelectric sensing layer senses the transverse vibration and generates an electric current to the control unit, and the piezoelectric action layers on both sides push or pull the inner sleeve and the ejector rod, so that the ejector rod moves in the direction opposite to the vibration direction, thereby offsetting the vibration in the transverse direction.

[0013] Preferably, a detection rod is fixedly connected in the shell; the detection rod is arranged obliquely; the other end of the detection rod is also provided with a piezoelectric sensing layer.

[0014] Preferably, an axial offset mechanism is further arranged in the shell; the axial offset mechanism comprises a magnet ring and an electromagnetic coil; the magnet ring is fixedly connected on the ejector rod; the electromagnetic coil is fixedly connected in the shell.

[0015] Preferably, the electromagnetic coil is arranged below the magnet ring.

[0016] Preferably, a sliding potentiometer is arranged on the ejector rod; a sliding block is slidably connected on the sliding potentiometer; an elastic sheet is fixedly connected on the electromagnetic coil; the elastic sheet is fixedly connected with the sliding block on the sliding potentiometer.

[0017] By arranging the detection rod with the same physical properties as the ejector rod in the shell, the vibration of the ejector rod in the vertical direction is detected, and the control unit generates a magnetic force on the magnet ring through the electromagnetic coil according to the detected vibration, so that the ejector rod moves in the direction opposite to the vibration direction through the magnet ring, thereby suppressing the vibration of the ejector rod in the vertical direction.

[0018] By arranging the sliding potentiometer on the ejector rod, the distance of the movement of the ejector rod under the action of the elastic diaphragm is detected through the sliding potentiometer, so that the current of the electromagnetic coil is corrected, the size of the current of the electromagnetic coil is adjusted, and the force of the electromagnetic coil acting on the magnet ring is ensured not to change the original size with the change of the distance from the magnet ring.

[0019] The beneficial effects of the present application are as follows:

[0020] 1. The present application sets piezoelectric sensing layer and piezoelectric action layer in the shell, the piezoelectric sensing layer senses the vibration in the horizontal direction and generates current to the control unit, the piezoelectric action layer on both sides pushes or pulls the inner sleeve and the top rod, so that the top rod moves in the opposite direction of the vibration direction, thereby offsetting the vibration in the horizontal direction.

[0021] 2. The present application sets a detection rod with the same physical properties as the top rod in the shell, thereby detecting the vibration of the top rod in the vertical direction, and the control unit generates magnetic force on the magnet ring through the electromagnetic coil according to the detected vibration, and moves the top rod in the opposite direction of the vibration direction through the magnet ring, thereby suppressing the vibration of the top rod in the vertical direction.

[0022] 3. The present application sets a sliding potentiometer on the top rod to detect the distance moved by the top rod under the action of the elastic diaphragm, thereby correcting the current of the electromagnetic coil and adjusting the size of the electromagnetic coil current, so as to ensure that the force of the electromagnetic coil acting on the magnet ring does not change with the distance between the magnet ring. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structure of the present application is shown in the figure;

[0024] Figure 2 The structure of the present application is shown in the figure;

[0025] Figure 3 The structure of the present application is shown in the figure; Figure 2 The enlarged view of A in the figure;

[0026] Figure 4 The enlarged view of B in the figure. Figure 2

[0027] In the figure: 1, shell; 11, elastic diaphragm; 12, top rod; 13, switch unit; 21, outer sleeve; 22, inner sleeve; 23, piezoelectric sensing layer; 24, piezoelectric action layer; 25, separation sleeve; 3, detection rod; 41, magnet ring; 42, electromagnetic coil; 43, sliding potentiometer; 44, sliding block; 45, elastic sheet; 5, sampling tube. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] Embodiment one: refer to the drawings attached Figure 1 , 2 ​A differential pressure switch for flue gas ducts, comprising:

[0030] The shell 1, the elastic diaphragm 11, the ejector rod 12 and the switch unit 13; the shell 1 is connected with the sampling pipe 5; the elastic diaphragm 11 is installed in the shell 1; the switch unit 13 is installed in the shell 1; the ejector rod 12 is slidably connected in the shell 1, one end of the ejector rod 12 is in contact with the elastic diaphragm 11, and the other end is in contact with the switch unit 13;

[0031] A radial offset mechanism is arranged in the shell 1; the radial offset mechanism is arranged around the ejector rod 12, and the radial offset mechanism senses the vibration of the shell 1 and applies a force opposite to the vibration direction when the vibration is transmitted to the ejector rod 12, so as to offset the radial vibration of the ejector rod 12.

[0032] In the present application, the radial offset mechanism comprises an outer sleeve 21, an inner sleeve 22, a piezoelectric sensing layer 23 and a piezoelectric action layer 24; the inner sleeve 22 is sleeved outside the ejector rod 12; the outer sleeve 21 is sleeved outside the inner sleeve 22; the inner sleeve 22 is slidably fitted with the ejector rod 12; a separation sleeve 25 is arranged between the outer sleeve 21 and the inner sleeve 22; the piezoelectric sensing layer 23 is located between the outer sleeve 21 and the separation sleeve 25; and the piezoelectric action layer 24 is located between the inner sleeve 22 and the separation sleeve 25.

[0033] A control unit is arranged in the shell 1; the piezoelectric sensing layer 23 is circuit-connected with the control unit; and the piezoelectric action layer 24 is circuit-connected with the control unit.

[0034] In the present application, the shell 1 is installed on the flue gas duct, and the sampling pipe 5 on the shell 1 extends into the flue gas duct, so that the inside of the shell 1 has the same air pressure as the inside of the flue gas duct.

[0035] In the present application, the piezoelectric sensing layer 23 and the piezoelectric action layer 24 are both made of a fan-shaped PZT piezoelectric ceramic sheet, the piezoelectric sensing layer 23 and the piezoelectric action layer 24 are arranged in a fan shape and enclose a circle; during the exhaust process of the flue gas duct, the motor drives the fan blades to rotate, the air in the flue gas duct flows, the flue gas duct vibrates, the vibration is transmitted along the axial direction of the flue gas duct, when the vibration passes through the present application, the shell 1 is vibrated with the flue gas duct, so that the outer sleeve 21 drives the piezoelectric sensing layer 23 to vibrate, the piezoelectric sensing layer 23 generates an electric current when vibrating, the control unit receives the electric current and inputs the electric current into the piezoelectric action layer 24 in the same direction, so that the piezoelectric action layer 24 deforms, pushes or pulls the inner sleeve 22, so that the inner sleeve 22 drives the ejector rod 12 to move slightly, the moving direction is opposite to the vibration direction, so as to offset the vibration of the ejector rod 12; according to the electric current generated by each piezoelectric sensing layer 23, the action of the piezoelectric action layer 24 is adjusted, and then the transverse vibration transmitted to the ejector rod 12 is relieved;

[0036] The gas pressure in the flue gas pipeline drives the elastic diaphragm 11 to deform, so that the elastic diaphragm 11 drives the jacking rod 12 to move in the vertical direction, when the pressure in the flue gas pipeline reaches a set value, the jacking rod 12 drives the switch unit 13, so that the switch unit 13 acts;

[0037] In the application, the sampling pipe 5 is communicated with the flue gas pipeline, the heat insulation material can be arranged in the shell, so that the ambient temperature of the piezoelectric sensing layer 23 and the piezoelectric action layer 24 is lower than 300 DEG C, so as to not affect the use of the piezoelectric sensing layer 23 and the piezoelectric action layer 24;

[0038] In the application, the piezoelectric sensing layer 23 senses the transverse vibration and generates current to the control unit, and the piezoelectric action layers 24 on both sides push or pull the inner sleeve 22 and the jacking rod 12, so that the jacking rod 12 moves in the direction opposite to the vibration direction, thereby offsetting the vibration in the transverse direction.

[0039] Example two: on the basis of example one, referring to the description attached Figure 1 、 2 , 3 and 4, in the application, the shell 1 is fixedly connected with the detection rod 3; the detection rod 3 is inclinedly arranged; the other end of the detection rod 3 is also provided with the piezoelectric sensing layer 23.

[0040] In the application, the shell 1 is also provided with an axial offset mechanism; the axial offset mechanism comprises a magnet ring 41 and an electromagnetic coil 42; the magnet ring 41 is fixedly connected on the jacking rod 12; the electromagnetic coil 42 is fixedly connected in the shell 1.

[0041] In the application, the electromagnetic coil 42 is arranged below the magnet ring 41.

[0042] In the application, the jacking rod 12 is provided with a sliding potentiometer 43; the sliding potentiometer 43 is slidably connected with a sliding block 44; the electromagnetic coil 42 is fixedly connected with an elastic sheet 45; the elastic sheet 45 is fixedly connected with the sliding block 44 on the sliding potentiometer 43.

[0043] In the application, the material, size and weight of the detection rod 3 are the same as those of the jacking rod 12, the piezoelectric sensing layers 23 are arranged at the upper and lower ends of the detection rod 3, after the detection rod 3 is vibrated in the upward and downward directions, the piezoelectric sensing layers 23 at both ends receive the vibration of the detection rod 3, the current is transmitted to the control unit, the control unit inputs the current into the electromagnetic coil 42, so that the electromagnetic coil 42 generates a magnetic field, and the magnetic field acts on the magnet ring 41 on the jacking rod 12, the jacking rod 12 is pushed up or pulled down, and the direction of the vibration of the jacking rod 12 is opposite to the direction of the vertical vibration, thereby offsetting the vibration of the jacking rod 12 in the vertical direction;

[0044] In the application, the electromagnetic coil 42 is located below the magnet ring 41, and during the upward movement of the ejector rod 12 under the action of the elastic diaphragm 11, the electromagnetic coil 42 will not block the magnet ring 41.

[0045] In the application, the sliding potentiometer 43 is arranged on the ejector rod 12, so that during the movement of the ejector rod 12 under the action of the elastic diaphragm 11, the sliding potentiometer 43 moves relative to the sliding block 44, and the sliding potentiometer 43 is connected with the control unit, so that the distance of the movement of the ejector rod 12 under the action of the elastic diaphragm 11 is detected according to the change of the voltage during the sliding process, and the size of the current to the electromagnetic coil 42 is adjusted in real time according to the distance of the movement of the ejector rod 12, so that the force of the electromagnetic coil 42 acting on the magnet ring 41 will not change due to the movement of the ejector rod 12 caused by the elastic diaphragm 11, so that the distance between the electromagnetic coil 42 and the magnet ring 41 changes, so that the force of the electromagnetic coil 42 acting on the magnet ring 41 changes, and further affects the damping effect of the electromagnetic coil 42 on the vibration of the ejector rod 12.

[0046] In the application, the vibration of the ejector rod 12 in the horizontal direction and the vertical direction is suppressed by two different ways, so that the horizontal direction and the vertical direction will not be disturbed, and if the electromagnetic coil 42 is used in both directions, the magnetic field generated by the electromagnetic coil 42 will interfere with each other, affecting the damping effect in both directions; the piezoelectric sensing layer 23 and the piezoelectric action layer 24 are only suitable for horizontal damping, and if they are used in the vertical direction, the movement of the ejector rod 12 in the vertical direction will be affected.

[0047] In the application, the detection rod 3 with the same physical properties as the ejector rod 12 is arranged in the shell 1, so as to detect the vibration of the ejector rod 12 in the vertical direction, and the control unit generates a magnetic force acting on the magnet ring 41 through the electromagnetic coil 42 according to the detected vibration, and moves the ejector rod 12 in the direction opposite to the vibration direction through the magnet ring 41, so as to suppress the vibration of the ejector rod 12 in the vertical direction.

[0048] In the application, the sliding potentiometer 43 is arranged on the ejector rod 12, and the distance of the movement of the ejector rod 12 under the action of the elastic diaphragm 11 is detected through the sliding potentiometer 43, so as to correct the current of the electromagnetic coil 42 and adjust the size of the current of the electromagnetic coil 42, so as to ensure that the force of the electromagnetic coil 42 acting on the magnet ring 41 will not change due to the change of the distance between the electromagnetic coil 42 and the magnet ring 41.

[0049] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application; the scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A micro differential pressure switch for use in a flue gas duct, characterized by: The utility model relates to a kind of sampling device, including Shell (1), elastic diaphragm (11), ejector rod (12) and switch unit (13);The sampling tube (5) is connected on the shell (1);The elastic diaphragm (11) is installed in shell (1);The switch unit (13) is installed in the shell (1);The ejector rod (12) is slidably connected in the shell (1), and one end of the ejector rod (12) is in contact with the elastic diaphragm (11), and the other end is in contact with switch unit (13); Radial offset mechanism is arranged in the shell (1);The radial offset mechanism is arranged around the ejector rod (12), and the radial offset mechanism senses the vibration of the shell (1), and when the vibration is transmitted to the ejector rod (12), the force opposite to the vibration direction is applied to offset the radial vibration of the ejector rod (12); The radial offset mechanism includes outer sleeve (21), inner sleeve (22), piezoelectric sensing layer (23) and piezoelectric action layer (24);The inner sleeve (22) is sleeved outside the ejector rod (12);The outer sleeve (21) is sleeved outside the inner sleeve (22);The inner sleeve (22) is slidably fitted with the ejector rod (12) up and down;The outer sleeve (21) and the inner sleeve (22) are provided with a separation sleeve (25);The piezoelectric sensing layer (23) is located between the outer sleeve (21) and the separation sleeve (25);The piezoelectric action layer (24) is located between the inner sleeve (22) and the separation sleeve (25); Control unit is arranged in the shell (1);The piezoelectric sensing layer (23) is circuit-connected with the control unit;The piezoelectric action layer (24) is circuit-connected with the control unit; Axial offset mechanism is also arranged in the shell (1);The axial offset mechanism includes magnet ring (41) and electromagnetic coil (42);The magnet ring (41) is fixedly connected on the ejector rod (12);The electromagnetic coil (42) is fixedly connected in the shell (1); The electromagnetic coil (42) is arranged below the magnet ring (41); The ejector rod (12) is provided with sliding potentiometer (43);The sliding potentiometer (43) is slidably connected with sliding block (44);The electromagnetic coil (42) is fixedly connected with elastic sheet (45);The elastic sheet (45) is fixedly connected with the sliding block (44) on the sliding potentiometer (43).

2. A differential pressure switch for flue gas ducts according to claim 1, characterized in that: Detection rod (3) is fixedly connected in the shell (1);The detection rod (3) is arranged obliquely;The other end of the detection rod (3) is also provided with piezoelectric sensing layer (23).

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