A wind pressure sensor

Abstract

The application discloses a wind pressure sensor, the edge of an elastic diaphragm is tightly sealed and fixed by a front shell and a bottom shell, and the elastic diaphragm is divided into a negative pressure cavity and a positive pressure cavity; a support is fixed on the middle of the surface of the elastic diaphragm in the negative pressure cavity and is connected with a return spring, and the return spring is arranged in the negative pressure cavity; a negative pressure air hole is arranged on the front shell, and a positive pressure air hole is arranged on the bottom shell; a magnetic ring cylinder is fixed in the middle of the support, and a cylinder cavity is arranged in the magnetic ring cylinder; a convex inductance column is fixed in the middle of the inside of the front shell in a sealed mode, an electric connection foot is connected to the top of the inductance column, and the electric connection foot of the inductance column extends outside the front shell; the magnetic ring cylinder and the inductance column are arranged in the negative pressure cavity; the magnetic ring cylinder and the inductance column are arranged in the return spring ring; the inductance column is linearly corresponding to the cylinder cavity; the product adopts a male-female penetrating principle, generates inductance in a ring mode, has larger magnetic flux, and is easier to capture inductance signals, and the detection of the inductance signals is more standard and accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to a wind pressure detection device or switch device for a wall-hanging water heater, and particularly relates to a wind pressure sensor. BACKGROUND

[0002] The existing patent authorized by the State Intellectual Property Office has the publication number CN204045496U, and discloses an invention patent of a wind pressure sensor of a wall-hanging water heater. The wind pressure sensor comprises a front shell, a rear shell, a recess hole is arranged in the middle of the front shell, a hole wall of the recess hole is provided with a strip-shaped protrusion, an extension column is installed in the recess hole, a recess is arranged on the side surface of the extension column, the recess is matched with the strip-shaped protrusion to inlay up and down guide sliding, an adjusting screw is penetrated into the bottom of the recess hole and inserted into the extension column body, the extension column is adjusted by rotating the adjusting screw, two conductive columns are arranged at the bottom end of the extension column, the conductive columns are electrically connected with the terminal by wires, an elastic diaphragm is fixed in the middle of the surface of the negative pressure cavity, the conductive sheet is in contact with the two conductive columns to conduct the power supply, and the power supply is cut off when the two conductive columns are separated. 1. After the product is used for a long time, the conductive contact between the conductive sheet and the two conductive columns will have carbon black, scale and oxidation, and the contact conduction will not be as sensitive as that of the new product. 2. The above only has the on / off function and belongs to a mechanical contact switch, and cannot sense (early warning) the approaching conduction or disconnection in advance. When the negative air pressure value of the negative pressure cavity is at the critical point of the wind pressure of the contact between the conductive sheet and the two conductive columns, if the wind pressure is unstable, the conductive sheet will be in contact with the two conductive columns at times and separated from the two conductive columns at times, so that the power supply is conducted at times and interrupted at times, which has adverse effects on the controller and electrical elements of the wall-hanging water heater, such as damage, easy to break, reduction of service life, temporary error of software operation program start / stop and the like. SUMMARY

[0003] In order to solve the above technical problems, the present application provides a wind pressure sensor with reasonable design and without mechanical contact, wherein the negative pressure of the negative pressure cavity pulls the elastic diaphragm to move to the inductance column direction, and the magnetic field inductance generated according to the depth of the inductance column inserted into the cylinder cavity is used to judge the negative pressure value change of the wind pressure.

[0004] The solution to the above technical problems is as follows:

[0005] A wind pressure sensor comprises a front shell, a bottom shell, an elastic diaphragm, a bracket and a return spring. The edge of the elastic diaphragm is tightly sealed and fixed by the front shell and the bottom shell, so that the inside between the elastic diaphragm and the front shell forms a negative pressure cavity, and the inside between the elastic diaphragm and the bottom shell forms a positive pressure cavity. A bracket is fixed in the middle of the surface of the elastic diaphragm in the negative pressure cavity, a return spring is connected between the middle of the bracket and the inner middle of the front shell, and the return spring is arranged in the negative pressure cavity. A negative pressure air hole is arranged on the front shell, and a positive pressure air hole is arranged on the bottom shell. A magnetic ring cylinder is fixed in the middle of the bracket, and a cylinder cavity is arranged in the magnetic ring cylinder.

[0006] A protruding inductor column is sealed and fixed in the middle of the front shell. The top of the inductor column is connected to a power pin, and the power pin of the inductor column extends outside the front shell. The magnetic ring cylinder and the inductor column are arranged in the negative pressure cavity. The magnetic ring cylinder and the inductor column are arranged in the reset spring coil.

[0007] The inductor column corresponds to the cylinder cavity in a straight line; the magnetic ring cylinder pulls the elastic diaphragm toward the inductor column through the negative pressure of the negative pressure cavity, and the inductor column is inserted into the cylinder cavity, and the insertion depth changes according to the negative pressure value of the negative pressure cavity.

[0008] The beneficial effects of a wind pressure sensor of the present invention are as follows: the product has a reasonable design and a reasonable structure, and has no mechanical contacts. The magnetic ring cylinder pulls the elastic diaphragm toward the inductance column through the negative pressure of the negative pressure cavity. The negative pressure value of the negative pressure cavity is different, the depth of the inductance column inserted into the cylinder cavity is different, and the generated inductance is different; the product adopts the male and female interlacing principle. When inserted, the inductance is generated in a circumferential manner, and its magnetic flux is larger. The inductance signal is easier to capture, and the detection of the inductance signal is more standard and accurate; the size of the inductance column is slightly smaller than the size of the magnetic ring cylinder, and the outer wall of the inductance column is very close to the inner wall of the magnetic ring cylinder. The inductance detection of this structure is more sensitive, the generation of inductance will be more accurate, the accuracy of the inductance detection will be improved, and the sensitivity of the wind pressure sensor to detect the working wind pressure will be improved; when the inductance column is inserted into the magnetic ring cylinder, the inductance column does not contact the magnetic ring cylinder, preventing mutual wear and disturbance of the magnetic field. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 、 Figure 2 A three-dimensional diagram of the product of the present invention;

[0010] Figure 3 It is a side view of the product of the present invention;

[0011] Figure 4 A bottom view of the product of the present invention;

[0012] Figure 5 A three-dimensional diagram of the front shell of the product of the present invention;

[0013] Figure 6 This is a disassembled diagram of the product of the present invention;

[0014] Figure 7 is a cross-sectional view of the product of the present invention;

[0015] Figure 8 This is a disassembled diagram of the front shell, inductor, and return spring of the product of the present invention;

[0016] Figure 9 A three-dimensional diagram of the front shell of the product of the present invention;

[0017] Figure 10A three-dimensional diagram of the product stand of the present invention;

[0018] Figure 11 A three-dimensional diagram of the inductor of the present invention;

[0019] Figure 12 This is a three-dimensional diagram of the magnet column of the product of the present invention.

[0020] Front shell 1, spring positioning groove 11, bottom shell 2, threaded through hole 21, screw 22, elastic diaphragm 3, inverted hook protrusion 31, bracket 4, bottom plate 41, hook hole 411, magnetic ring fixing part 42, reset spring 5, negative pressure chamber 6, negative pressure vent 61, positive pressure chamber 7, positive pressure vent 71, magnetic ring cylinder 8, cylinder cavity 81, inductor column 9, recessed hole 9A, inductor 9B, electrical connection pin 91, hollow tube 92, through-hole 93, inductor coil 9B1, magnet column 9B2, upper convex ring 9B21, winding groove 9B22, lower convex ring 9B23, controller A, data cable connector A1, shell cover A2. DETAILED DESCRIPTION

[0021] A wind pressure sensor includes a front shell 1, a bottom shell 2, an elastic diaphragm 3, a bracket 4, and a return spring 5. The edge of the elastic diaphragm 3 is clamped and sealed by the front shell 1 and the bottom shell 2, thereby forming a negative pressure chamber 6 between the elastic diaphragm 3 and the front shell 1, and a positive pressure chamber 7 between the elastic diaphragm 3 and the bottom shell 2. The bracket 4 is fixed in the middle of the surface of the elastic diaphragm 3 in the negative pressure chamber 6. The return spring 5 is connected between the middle of the bracket 4 and the middle of the front shell 1. The return spring 5 is arranged in the negative pressure chamber 6; the front shell 1 is provided with a negative pressure vent 61, and the bottom shell 2 is provided with a positive pressure vent 71. The main technical improvement of this product is that a magnetic ring cylinder 8 is fixed in the middle of the bracket 4, and the magnetic ring cylinder 8 contains a cylinder cavity 81;

[0022] A protruding inductor column 9 (i.e., a column inductor) is sealed and fixed in the middle of the front shell 1. The top of the inductor column 9 is connected to an electrical connection pin 91, and the electrical connection pin 91 of the inductor column 9 extends outside the front shell 1. The magnetic ring cylinder 8 and the inductor column 9 are arranged in the negative pressure cavity 6. The magnetic ring cylinder 8 and the inductor column 9 are arranged within the return spring 5. The return spring 5 does not contact the magnetic ring cylinder 8 and does not interfere with the magnetic induction.

[0023] The inductor column 9 corresponds to the cylindrical cavity 81 in a straight line; the magnetic ring cylinder 8 pulls the elastic diaphragm 3 toward the inductor column 9 through the negative pressure of the negative pressure cavity 6, and the inductor column 9 is inserted into the cylindrical cavity 81. The insertion depth varies according to the negative pressure value of the negative pressure cavity 6.

[0024] The size of the inductor column 9 is slightly smaller than the size of the cylindrical cavity 81 .

[0025] The above structure constitutes the basic structure of this product and realizes its basic detection function. The voltage used by the inductor column 9 is 3V to 8V, preferably 5V. The technical improvement of this wind pressure sensor lies in the location of the above components and the structure of the components working together.

[0026] Under normal conditions of this wind pressure sensor, the elastic diaphragm 3 and the bracket 4 are stretched open by the reset spring 5; when the negative pressure vent 61 is sucked, air will enter the opposite positive pressure cavity 7 through the positive pressure vent 71, and the magnetic ring cylinder 8 will pull the elastic diaphragm 3 toward the inductor column 9 through the negative pressure of the negative pressure cavity 6, and the reset spring 5 will be compressed and generate a rebound force, so that the inductor column 9 is inserted into the cylinder cavity 81. When the negative pressure value of the negative pressure cavity 6 is greater, the inductor column 9 is inserted deeper into the cylinder cavity 81, the magnetic ring cylinder 8 covers a greater proportion of the outer circumference of the inductor column 9, the magnetic induction (magnetic field) alternating variable is greater / stronger, and the generated inductance is greater. On the contrary, when the negative pressure value of the negative pressure chamber 6 is smaller, the inductance column 9 is inserted shallower into the cylinder cavity 81, the proportion of the magnetic ring cylinder 8 covering the outer periphery of the inductance column 9 is smaller, the magnetic induction (magnetic field) alternating variable is smaller / weaker, and the generated inductance is smaller; this product adopts the principle of male and female interlacing. When plugged in, the inductance is generated in a circumferential manner, the magnetic flux is larger, the inductance signal is easier to be captured, and the detection of the inductance signal is more standard and accurate; the magnetic ring cylinder 8 and the inductance column 9 of this structure are very close when working, the magnetic induction is sensitive, the inductance detection is more sensitive, the inductance detection is accurate, and the accuracy of the inductance detection is improved.

[0027] The change in inductance obtained by the wind pressure sensor device through this structure can more accurately judge the change in the negative pressure value of the wind pressure; the change in inductance obtained by the wind pressure sensor device through this structure provides a more favorable and accurate signal for the early warning and start / stop of its control work, reduces the probability of the wind pressure sensor device indicating an error during operation, and improves the sensitivity of the wind pressure sensor device in detecting the working wind pressure.

[0028] The change in inductance provides early warning and convenient switching conditions for the control of subsequent wind pressure sensor-using appliances (such as wall-mounted boiler water heaters).

[0029] It is more accurate to use an instrument to determine whether the wind pressure sensor is within the normal working range by the change of inductance.

[0030] For example, this product is installed on a wall-mounted boiler water heater for use, the negative pressure vent hole 61 is connected to the fan of the wall-mounted boiler water heater through the air pipe, and the negative pressure chamber 6 is connected to the fan wheel chamber through the negative pressure vent hole 61 and the air pipe; under normal conditions, the elastic diaphragm 3 and the bracket 4 are stretched open by the return spring 5, and no inductance is generated; when the wall-mounted boiler water heater is working, the fan exhausts air, and since the fan wheel chamber is connected to the negative pressure chamber 6, the negative pressure chamber 6 is in a sucked state when the fan is exhausting smoothly (and relatively The positive pressure chamber 7 will enter the air through the positive pressure vent 71 to balance the air pressure), and the magnetic ring tube 8 will pull the elastic diaphragm 3 toward the inductor column 9 through the negative pressure of the negative pressure chamber 6, and the inductor column 9 will be inserted into the cylinder cavity 81. When the negative pressure value of the negative pressure chamber 6 is greater, the inductor column 9 is inserted deeper into the cylinder cavity 81, and the magnetic ring tube 8 covers the outer periphery of the inductor column 9. The greater / stronger the alternating amount of magnetic induction (magnetic field), the more inductance is generated, which means that the fan exhaust volume is greater and smoother. On the contrary, when the negative pressure value of the negative pressure chamber 6 is greater, the inductor column 9 is inserted deeper into the cylinder cavity 81, and the magnetic ring tube 8 covers the outer periphery of the inductor column 9. 6, the smaller the negative pressure value, the shallower the inductance column 9 is inserted into the cylinder cavity 81, the smaller the proportion of the magnetic ring cylinder 8 covering the outer periphery of the inductance column 9, the smaller / weaker the alternating variable of the magnetic induction (magnetic field), and the smaller the inductance generated, indicating that the fan exhaust volume is smaller or it encounters exhaust difficulties; when the control system of the wall-mounted boiler water heater detects an inductance value lower than the set value, it indicates that the fan exhaust is encountering difficulties or the exhaust air volume is small, and the working requirements / conditions of the wall-mounted boiler water heater are not met, and the control system of the wall-mounted boiler water heater stops working; when the control system of the wall-mounted boiler water heater detects that the inductance value is close to the critical range of the shutdown value, it uses the critical value of the shutdown inductance signal as a system warning to prepare for the shutdown work, enter the preparation stop program, protect the operating software and hardware of the control system, and finally slowly transition to shutdown, reducing the probability of temporary start / stop errors during the operation of the control system software of the wall-mounted boiler water heater, making the control system start / stop operation, error operation, etc. more smoother transition, and its control system is more flexible.

[0031] Preferred structure: The inductor column 9 includes a recessed hole 9A and an inductor 9B arranged in the middle of the front shell 1, and the top of the inductor 9B is connected to a connecting pin 91, and the inductor 9B is inserted into the recessed hole 9A and sealed and fixed; the connecting pin 91 of the inductor 9B extends from the outer end (bottom) of the recessed hole 9A to the outside of the front shell 1; this is to set the center point of the fixed inductor 9B and the positioning point for fixed installation, so that workers can easily assemble the inductor column 9, and the recessed hole 9A makes the inductor 9B fixed more firmly and stably; the inductor 9B is inserted into the recessed hole 9A and is solidified and connected by liquid sealant; the recessed hole 9A of this preferred structure is not limited to how it is formed, and can be formed by sinking in the middle of the front shell 1, and the top of the inductor 9B is 2 mm to 5 mm inserted into the recessed hole 9A and connected and fixed by sealant, and the rest of the inductor 9B body extends out of the negative pressure cavity.

[0032] Preferred structure: the recessed hole 9A is formed by a hollow tube 92 extending from the middle of the interior of the front shell 1 and protruding inside. The hollow tube 92 protrudes from the negative pressure chamber 6, and the interior of the hollow tube 92 is the recessed hole 9A, which further refines the formation structure of the recessed hole 9A. In essence, the recessed hole 9A is formed by the inner hollow of the hollow tube 92, and can be a blind hole or a through hole; the inductor 9B is completely inserted and fixed in the recessed hole 9A, preventing the surface of the inductor 9B from being exposed to the air for a long time from oxidation, fouling, and moisture regaining, and always keeping it dry without affecting the working performance; liquid sealant is used to solidify and seal the two ends of the recessed hole 9A, and the sealing effect is better; a through hole 93 is provided at the bottom of the recessed hole 9A, and the connecting pin 91 of the inductor 9B passes through the through hole 93 and extends to the outside of the front shell 1, so that the inductor 9B is better installed and pre-fixed, and the through hole 93 can only pass through the connecting pin 91, and the through hole 93 also makes it easier to position and fix the connecting pin 91.

[0033] Preferred structure: The inductor 9B includes an inductor coil 9B1 and a magnet column 9B2. The inductor coil 9B1 is wound around the magnet column 9B2. The electrical connection pin 91 is formed by extending copper wire joints from both ends of the inductor coil 9B1 or by connecting electrical conductor pins at both ends of the inductor coil 9B1. The electrical connection pin 91 is connected to the top of the magnet column 9B2. This is to further refine the specific structure of the inductor 9B and make the inductance generation more reasonable and accurate. The inductor coil 9B1 can be a single layer or multiple layers, depending on the power requirement. The inductor coil 9B1 is formed by winding copper wire.

[0034] Preferred Structure: Connector pins 91 are formed by connecting the two ends of inductor coil 9B1 to electrical conductor pins. The conductor pins extend through holes 93 and out of the front housing 1. The conductor pins are made of aluminum or copper, which is relatively rigid and less prone to deformation, making assembly and welding easier. There are two connector pins 91: one input and one output.

[0035] Preferred structure: Magnet column 9B2 is integrally formed, with an upper raised ring 9B21 at its top and a lower raised ring 9B23 at its bottom. A winding groove 9B22 is formed between lower raised ring 9B23 and upper raised ring 9B21, and inductor coil 9B1 is wound into winding groove 9B22. Inductor coil 9B1 and magnet column 9B2 are fully inserted into recessed hole 9A and secured with sealant. Lower raised ring 9B23 terminates magnet column 9B2.

[0036] This is to refine the structure of the magnet column 9B2, with the inductor coil 9B1 concentrated in the middle section. The position of the inductor coil 9B1 is more reasonably set, so that the magnetic field mainly changes in the middle section. The material of the inductor coil 9B1 is copper wire with a diameter of 0.05 mm to 0.3 mm, preferably 0.1 mm to 0.15 mm. The inductor coil 9B1 is easily positioned when wound in the winding groove 9B22, and the winding is more regular, and the inductance is generated regularly. When the elastic diaphragm 3 is displaced, the end of the inductor column 9 is first inserted into the cylindrical cavity 81, and then gradually approaches the inductor coil 9B1, allowing the inductance value to slowly increase to provide a transition. When the inductor coil 9B1 is fully inserted into the cylindrical cavity 81, the magnetic flux is maximized and the inductance is the largest. During operation, more magnetic flux is generated and the inductance signal is better.

[0037] Preferred structure: The inductor column 9 is circumferentially provided with a spring positioning groove 11, with a depth of 0.5 cm to 1 cm. One end of the return spring 5 presses into the spring positioning groove 11, while the other end presses into the center of the bracket 4. This better secures the return spring 5, as the spring is relatively soft, preventing it from tilting or eccentricity. It also prevents the spring from tilting or eccentricity due to vibration, resulting in better positioning. The return spring 5 does not directly contact the magnetic ring tube, preventing it from interfering with its magnetic properties.

[0038] Preferred structure: A threaded through hole 21 is provided in the middle of the bottom shell 2, and a screw 22 is screwed on the threaded through hole 21, and the screw 22 extends into the middle of the positive pressure chamber 7 and contacts the elastic diaphragm 3; the screw 22 is used for the initial adjustment of the distance between the magnetic ring cylinder 8 and the inductor column 9. Before leaving the factory, the wind pressure sensor is screwed into the top pressure elastic diaphragm 3 through the screw 22 to determine the distance between the magnetic ring cylinder 8 and the inductor column 9, determine the starting point, and determine whether it is qualified through the wind pressure detection instrument.

[0039] Preferred structure: A controller A is fixed on the outside of the front shell 1 (controller A is: a control circuit board or a signal processing controller or an inductance processing controller or an inductance processing control system, etc.). The controller A is used to energize the inductance column 9, collect inductance and related inductance signal processing. The controller A is close to the inductance column 9, and its collected signals are more accurate and precise, reducing the collection distance. The inductance signal processing is faster, more efficient and more accurate. The controller A is connected to the power pin 91; the controller A is connected to the data line connector A1, and the data line connector A1 is connected to the control system of the wind pressure sensor using device with a data line and transmits data to the wind pressure sensor using device; a shell cover A2 is connected to the front shell 1, and the shell cover A2 covers the controller A and the data line connector A1 to protect the controller A and fix the data line connector A1.

[0040] Preferred structure: The controller A includes an RLC resonant circuit, which can convert inductance into resonant frequency output and transmit data to the control system of the wind pressure sensor device. This can also realize wind pressure detection, better match the control system of the wind pressure sensor device, and have better detection effect; the range of resonant frequency output is: 1200Hz~2000Hz, preferably: 1400Hz~1800Hz.

[0041] Preferred structure: the magnetic ring cylinder 8 is a ferrite magnetic ring cylinder; the magnet column 9B2 is a ferrite magnet column; ferrite is a metal oxide with ferrimagnetism. In terms of electrical properties, the resistivity of ferrite is much greater than that of single metal or alloy magnetic materials, and it also has higher dielectric properties. The magnetic properties of ferrite are also manifested in higher magnetic permeability at high frequencies, which is very suitable for use in inductance. Its inductance changes stably, its magnetic permeability is good, and it is easy to capture and detect.

[0042] Preferred structure: The bracket 4 includes a base plate 41 and a magnetic ring fixture 42. The base plate 41 is fixedly connected to the magnetic ring fixture 42 in the middle. The magnetic ring fixture 42 is fixedly connected to the magnetic ring cylinder 8. The magnetic ring fixture 42 is inserted within the five turns of the reset spring. The magnetic ring cylinder 8 is also arranged within the five turns of the reset spring. The fixing structure of the magnetic ring cylinder 8 and the spring position are reasonably set. The diameter of the inductor column 9 is slightly smaller than the diameter of the cylinder cavity 81, which improves and increases the magnetic induction variable performance. The shape of the inductor column 9 is consistent with the shape of the magnetic ring cylinder 8 and the cylinder cavity 81, and the generated magnetic induction is regular. The inductor column 9 is cylindrical, while the corresponding magnetic ring cylinder 8 and the cylinder cavity 81 are circular.

[0043] Preferred structure: a plurality of inverted hook convex particles 31 extend from the middle of the surface of the negative pressure cavity 6 of the elastic diaphragm 3, and a corresponding number of hook holes 411 are provided on the bottom plate 41, and the inverted hook convex particles 31 pass through the hook holes and hook the bottom plate 41 to be fixed.

[0044] Preferred structure: The end of the inductor column 9 is inserted into the mouth of the cylinder cavity 81 of the magnetic ring cylinder 8 by 1 mm to 3 mm for positioning, preferably 1 mm. Under normal circumstances, the end of the inductor column 9 is inserted a little bit into the mouth of the magnetic ring cylinder 8 to ensure that the inductor column is 100% aligned with the cylinder cavity 81 of the magnetic ring cylinder 8. The cylinder cavity 81 is a through-hole type. When there is wind pressure, it can be quickly aligned and shifted to prevent the elastic diaphragm 3, the bracket 4, and the reset spring 5 from shaking, falling out, eccentricity, bouncing, etc. It has good positioning ability, ensuring that it can work well every time, detect accurately and precisely, and ensure that the inductor column can be 100% aligned with the cylinder cavity 81 of the magnetic ring cylinder 8 no matter how the wind pressure sensor is placed and installed; the wind pressure sensor is installed on the instrument for use, and when working, the vibration of the instrument using the wind pressure sensor, such as bouncing and shaking, is not affected.

[0045] Preferred structure: The magnetic ring fixing part 42 is composed of a plurality of surrounding elastic inverted hooks, and the magnetic ring tube 8 is inserted in the middle of the plurality of elastic inverted hooks and is hooked and fixed; the magnetic ring tube 8 is better fixed and the installation is convenient.

[0046] Preferred structure: the front shell 1, bottom shell 2, and bracket 4 are made of plastic, and the elastic diaphragm 3 is made of silicone or rubber; the wind pressure sensor is a perfect circle as a whole, and the corresponding elastic diaphragm 3, positive pressure cavity 7, and negative pressure cavity 6 are perfect circles.

[0047] Preferred structure: the diameters of the elastic diaphragm 3 , the positive pressure cavity 7 , and the negative pressure cavity 6 are 4 cm to 7 cm; the diameter of the elastic diaphragm 3 is larger than the diameters of the positive pressure cavity 7 and the negative pressure cavity 6 .

[0048] Preferred structure: Of course, the inductor can also be replaced by an electronic transformer.

[0049] Because the wind pressure sensor operates at relatively low wind pressure, to improve wind pressure detection sensitivity, the spring wire of the return spring 5 should be relatively thin. Its wire diameter ranges from 0.2 mm to 0.5 mm, preferably from 0.3 mm to 0.4 mm. The overall diameter of the return spring 5 ranges from 0.7 cm to 2 cm. The maximum compression of the return spring 5 is 20 grams, preferably from 8 grams to 15 grams. Both the elastic diaphragm 3 and the base plate 41 are perfectly circular, with the base plate 41 diameter being 60% to 85% of the diameter of the elastic diaphragm 3, preferably from 70% to 75%, representing a preferred ratio. The thickness of the active area of ​​the elastic diaphragm 3 ranges from 0.08 mm to 0.2 mm, preferably from 0.1 mm, and the maximum thickness of the area in contact with the base plate 41 is 1.5 mm. The base plate 41 weighs from 5 grams to 10 grams. The diameter of the cylinder cavity 81 ranges from 5 mm to 1.5 cm, preferably from 8 mm to 1.2 cm. The height of the magnetic ring cylinder 8 ranges from 0.7 cm to 2 cm, preferably from 1.2 cm to 1.5 cm. The diameter of the magnetic ring tube 8 is 0.7 cm to 1.7 cm. The dimensions and weights of the components are set above to make this product more suitable for use with wall-mounted boiler water heaters. In order to better adapt to the use of wall-mounted boiler water heaters, the floating detection working wind pressure range of the wind pressure sensor of this product is: 0Pa to 100Pa, and the working pressure is preferably 20Pa to 80Pa. In actual use, the wind pressure sensor or the control system of the corresponding device is set to a pressure value greater than a certain value to be qualified (for example, setting a wind pressure greater than 30Pa is considered normal); of course, a larger or smaller floating detection working wind pressure range can also be designed to detect different equipment and power requirements.

[0050] The specific structure of the product embodiment is as follows:

[0051] A wind pressure sensor comprises a front shell 1, a bottom shell 2, an elastic diaphragm 3, a bracket 4, and a return spring 5. The edge of the elastic diaphragm 3 is clamped and sealed by the front shell 1 and the bottom shell 2 (that is, the front shell 1 and the bottom shell 2 are sealed and separated into a positive pressure chamber 7 and a negative pressure chamber 6 by the elastic diaphragm 3), thereby forming a negative pressure chamber 6 between the elastic diaphragm 3 and the front shell 1, and a positive pressure chamber 7 between the elastic diaphragm 3 and the bottom shell 2. A bracket 4 is fixed in the middle of the surface of the elastic diaphragm 3 in the negative pressure chamber 6, and a return spring 5 is connected between the middle part of the bracket 4 and the middle part of the front shell 1. The return spring 5 is arranged in the negative pressure chamber 6; a negative pressure vent hole 61 is provided on the front shell 1, and a positive pressure vent hole 71 is provided on the bottom shell 2; a threaded through hole 21 is provided in the middle of the bottom shell 2, and a screw 22 is screwed on the threaded through hole 21, and the screw 22 extends into the middle of the positive pressure chamber 7 and contacts the elastic diaphragm 3;

[0052] The bracket 4 includes a bottom plate 41 and a magnetic ring fixing part 42. The middle of the bottom plate 41 is fixedly connected to the magnetic ring fixing part 42. The magnetic ring fixing part 42 is fixedly connected to the magnetic ring cylinder 8. The magnetic ring fixing part 42 and the magnetic ring cylinder 8 are inserted into the coils of the reset spring 5. The reset spring 5 does not contact the magnetic ring cylinder 8 and does not interfere with the magnetic induction.

[0053] The magnetic ring cylinder 8 contains a cylinder cavity 81;

[0054] A hollow tube 92 protrudes from the middle of the front shell 1. The hollow tube 92 protrudes from the negative pressure chamber 6. The interior of the hollow tube 92 is a recessed hole 9A. An inductor 9B is fixed in the recessed hole 9A. The inductor 9B and the hollow tube 92 form an inductor column 9. The diameter of the inductor column 9 is slightly smaller than the diameter of the cylinder cavity 81. The shape of the inductor column 9 is consistent with the shapes of the magnetic ring cylinder 8 and the cylinder cavity 81, both of which are perfect circles. A through-hole 93 is provided at the bottom of the recessed hole 9A. The electrical connection pin 91 of the inductor 9B extends through the through-hole 93 and extends to the outside of the front shell 1. The electrical connection pin 91 is connected to the controller A, and the controller A is fixed to the outside of the front shell 1. The end of the inductor column 9 is inserted 1 mm to 3 mm into the opening of the cylinder cavity 81 of the magnetic ring cylinder 8 for positioning.

[0055] A spring positioning groove 11 is provided around the circumference of the hollow tube 92. One end of the return spring 5 is pressed into the spring positioning groove 11, and the other end is pressed against the middle of the bracket 4.

[0056] Under normal conditions of this wind pressure sensor, the elastic diaphragm 3 and the bracket 4 are stretched open by the reset spring 5; the diameters of the elastic diaphragm 3, the positive pressure cavity 7, and the negative pressure cavity 6 are 4 cm to 7 cm; the diameter of the elastic diaphragm 3 is larger than the diameters of the positive pressure cavity 7 and the negative pressure cavity 6.

[0057] The voltage used by the inductor 9B is 5V. The technical improvement of the present air pressure sensor lies in the setting positions of the above-mentioned components and the structure of the cooperation of the components. The above-mentioned structure constitutes the basic structure of the product and realizes the basic detection function thereof.

Claims

1. A wind pressure sensor, comprising a front shell, a bottom shell, an elastic diaphragm, a bracket, and a return spring. The edges of the elastic diaphragm are clamped and sealed by the front shell and the bottom shell, thereby forming a negative pressure chamber between the elastic diaphragm and the front shell, and a positive pressure chamber between the elastic diaphragm and the bottom shell. The bracket is fixed in the middle of the elastic diaphragm surface in the negative pressure chamber, and the return spring is connected between the middle of the bracket and the middle of the front shell. The return spring is arranged in the negative pressure chamber. The front shell is provided with a negative pressure vent hole, and the bottom shell is provided with a positive pressure vent hole. The sensor is characterized in that: A magnetic ring cylinder is fixed in the middle of the bracket, and a cylinder cavity is inside the magnetic ring cylinder; A protruding inductor column is sealed and fixed in the middle of the front shell. The top of the inductor column is connected to a power pin, and the power pin of the inductor column extends outside the front shell. The magnetic ring cylinder and the inductor column are arranged in the negative pressure cavity. The magnetic ring cylinder and the inductor column are arranged in the reset spring coil. The inductor column corresponds to the cylinder cavity in a straight line; the magnetic ring cylinder pulls the elastic diaphragm toward the inductor column through the negative pressure of the negative pressure cavity, and the inductor column is inserted into the cylinder cavity, and the insertion depth changes according to the negative pressure value of the negative pressure cavity.

2. The wind pressure sensor according to claim 1, characterized in that: The inductor column includes a recessed hole and an inductor arranged in the middle of the front shell. The top of the inductor is connected to a power pin, and the inductor is inserted into the recessed hole and sealed and fixed; the power pin of the inductor extends from the outer end of the recessed hole to the outside of the front shell.

3. The wind pressure sensor according to claim 2, characterized in that: The recessed hole is formed by a hollow tube with a protrusion extending from the middle of the interior of the front shell. The hollow tube protrudes into the negative pressure cavity, and the interior of the hollow tube is the recessed hole. The inductor is completely inserted into the recessed hole and fixed. A through hole is provided at the bottom of the recessed hole, and the electrical connection pin of the inductor extends through the through hole to the outside of the front shell.

4. The wind pressure sensor according to claim 3, characterized in that: The inductor includes an inductor coil and a magnet column. The inductor coil is wound around the magnet column. The electrical pins are formed by extending copper wire joints from both ends of the inductor coil or by connecting electrical conductor pins at both ends of the inductor coil. The electrical pins are connected to the top of the magnet column.

5. The wind pressure sensor according to claim 4, characterized in that: The magnet column is integrally formed, with an upper convex ring on the top and a lower convex ring on the bottom. A winding groove is formed between the lower convex ring and the upper convex ring, and the inductor coil is wound in the winding groove; the inductor coil and the magnet column are completely inserted into the recessed hole and sealed and fixed by sealant.

6. The wind pressure sensor according to claim 1, characterized in that: A spring positioning groove is arranged around the circumference of the inductor column, one end of the return spring is pressed into the spring positioning groove, and the other end is pressed against the middle of the bracket.

7. The wind pressure sensor according to claim 1, characterized in that: A threaded through hole is provided in the middle of the bottom shell, a screw is screwed on the threaded through hole, and the screw extends into the positive pressure cavity and contacts the elastic diaphragm; A controller is fixed on the outside of the front shell, and the controller is connected to the power pin; the controller is connected to a data line connector; a shell cover is connected to the front shell, and the shell cover covers the controller and the data line connector.

8. The wind pressure sensor according to claim 4, characterized in that: The magnetic ring cylinder is a ferrite magnetic ring cylinder; the magnet column is a ferrite magnet column.

9. The wind pressure sensor according to claim 1, characterized in that: The bracket includes a base plate and a magnetic ring fixing part. The middle of the base plate is fixedly connected to the magnetic ring fixing part, which is fixedly connected to the magnetic ring cylinder. The magnetic ring fixing part is inserted into the reset spring coil. The end of the inductor column is inserted 1 mm to 3 mm into the cylinder cavity opening of the magnetic ring cylinder for positioning. The diameter of the inductor column is slightly smaller than the diameter of the cylinder cavity. The shape of the inductor column is consistent with the shape of the magnetic ring cylinder and the cylinder cavity.

10. The wind pressure sensor according to claim 1, characterized in that: The spring wire diameter of the return spring is 0.2 mm to 0.5 mm; the overall diameter of the return spring is 0.7 cm to 2 cm; the maximum compression of the return spring is 20 grams; the diameter of the cylinder cavity is 5 mm to 1.5 cm; the height of the magnetic ring cylinder is 0.7 cm to 2 cm; and the diameter of the magnetic ring cylinder is 0.7 cm to 1.7 cm. The front shell, bottom shell and bracket are made of plastic, and the elastic diaphragm is made of silicone or rubber; the wind pressure sensor is a perfect circle as a whole, and the corresponding elastic diaphragm, positive pressure cavity and negative pressure cavity are perfect circles; the diameters of the elastic diaphragm, positive pressure cavity and negative pressure cavity are 4 cm to 7 cm; the diameter of the elastic diaphragm is larger than the diameters of the positive pressure cavity and negative pressure cavity.

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