Anti-icing structure of pressure sensor

Abstract

A pressure sensor anti-icing structure disclosed by the present invention comprises a first shell and a second shell, the second shell is fixed below the first shell, an induction box is arranged below the second shell, the lower end of the second shell is fixedly connected with the induction box through a connecting cylinder, a cavity is formed in the induction box, and the second shell is fixed below the first shell. An installation opening is formed in the inner bottom of the induction box, an induction film is installed in the installation opening, the upper end of the connecting cylinder is communicated with the interior of the second shell, the lower end of the connecting cylinder is communicated with the interior of the cavity, a sealing plate is arranged in the second shell, and two pressure-sensitive elements are symmetrically installed at the lower end of the sealing plate. In the actual use process of the anti-icing structure, the possibility of generating condensation is reduced, in addition, the anti-icing structure is further provided with the heating mechanism, the sensing film can be always at the proper temperature, and the anti-icing effect is achieved.

Description

Technical Field

[0001] The invention relates to the field of anti-icing of pressure sensors, and in particular to an anti-icing structure of a pressure sensor. Background Art

[0002] Pressure sensors are widely used in various fields, for example: monitoring the gas pressure in the hydrogen and air pipelines in the hydrogen fuel cell vehicle engine system. Pressure monitoring plays a very important role in protecting the membrane electrode of the fuel cell, power generation efficiency and power stability, thereby protecting the stability of the fuel cell system. The existing pressure sensors are prone to condensation and ice formation in a low temperature environment of 0°C to -40°C, which makes the sensor measurement invalid. The reason is that the monitoring ports of traditional pressure sensors are all set in a concave circular hole shape. Once the temperature difference between day and night is too large, dew will condense on the inner surface of the circular hole. In an environment of 0°C to -40°C, the dew will condense into ice cubes and adhere to the inner surface of the circular hole, blocking the measuring port, isolating the sensor sensing core from the external air pressure, and making it impossible to sense the pressure of the measured gas in a low temperature environment; To this end, the utility model patent with publication number CN217006188U discloses an anti-icing pressure sensor for a fuel cell system, including a main shell and a monitoring probe installed on the main shell; a liquid storage chamber is provided inside the monitoring probe, the liquid storage chamber is filled with a pressure-transmitting liquid and the open end of the liquid storage chamber is sealed by a pressure-bearing membrane, the pressure-bearing membrane is in direct contact with the pressure-transmitting liquid, the pressure-bearing membrane is provided with a plurality of indentations for preventing condensed water from accumulating on its surface, a pressure-sensitive element extending into the liquid storage chamber is also fixed on the monitoring probe, the outer surface of the pressure-bearing membrane is in direct contact with the gas to be monitored, the pressure-bearing membrane transfers the pressure from the gas to be monitored to the pressure-transmitting liquid, the pressure-transmitting liquid transfers the pressure to the pressure-sensitive element, and the pressure-sensitive element converts the pressure to the pressure into a pressure signal and outputs it; the utility model effectively solves the problem that the traditional pressure sensor cannot work normally due to condensation and icing in a low temperature environment; However, in actual use, we found that although the above device can reduce the occurrence of condensation, it cannot completely avoid the generation of condensation, which leads to the possibility of ice formation under low temperature conditions. Once ice forms, it will still affect the actual pressure sensing effect. Therefore, how to solve this problem is what we need to consider. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an anti-icing structure for a pressure sensor. The anti-icing structure reduces the possibility of condensation during actual use. In addition, a heating mechanism is provided to keep the sensing membrane at a suitable temperature at all times, thereby achieving an anti-icing effect.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A pressure sensor anti-icing structure comprises a first shell and a second shell, wherein the second shell is fixed below the first shell, an induction box is arranged below the second shell, the lower end of the second shell is fixedly connected to the induction box via a connecting tube, a cavity is arranged in the induction box, an installation opening is arranged at the inner bottom of the induction box, a sensing membrane is installed in the installation opening, the upper end of the connecting tube is communicated with the interior of the second shell, the lower end of the connecting tube is communicated with the interior of the cavity, a sealing plate is arranged in the second shell, two pressure-sensitive elements are symmetrically installed at the lower end of the sealing plate, the bottom space of the second shell, the connecting tube and the cavity are commonly filled with a first temperature-conducting oil; a sensing mechanism, wherein the sensing mechanism is used to sense pressure; and a heating mechanism, wherein the heating mechanism is used to heat the first temperature-conducting oil.

[0005] Preferably, an installation opening is provided at the upper end of the first shell, and a sealing cover is installed in the installation opening.

[0006] Preferably, a mounting circular plate is fixedly connected to the outer side of the connecting cylinder, an annular groove is provided on the outer side of the mounting circular plate, and a sealing ring is provided in the annular groove.

[0007] Preferably, the lower end surface of the sensing film is in an arc shape, and an annular convex strip is provided on the lower end surface of the sensing film.

[0008] Preferably, the sensing mechanism comprises a circuit board installed in the first housing, and the two pressure-sensitive elements are electrically connected to the circuit board via a conductive wire.

[0009] Preferably, the heating mechanism includes a spiral temperature conducting tube arranged inside the second shell and the connecting tube, a heating box is fixedly connected to the right side of the second shell, a liquid pump is fixedly connected to the right side of the first shell, the liquid inlet end of the liquid pump is connected to a liquid inlet pipe, the other end of the liquid inlet pipe is connected to the upper end of the spiral temperature conducting tube, the liquid outlet end of the liquid pump is connected to a liquid outlet pipe, the other end of the liquid outlet pipe extends to the inside of the heating box, and the inner bottom of the heating box is connected to the lower end of the spiral temperature conducting tube through a connecting pipe.

[0010] Preferably, the heating box is filled with a second temperature-conducting oil, and two stirring plates are symmetrically arranged in the heating box. Both stirring plates are made of a temperature-conducting material, and both stirring plates are embedded with a heating wire.

[0011] Preferably, a rotating tube is vertically arranged in the heating box, and the rotating tube is connected to the lower end of the liquid outlet pipe through a rotating joint. The rotating tube is a tube body with a sealed lower end face, and both sides of the rotating tube are fixedly connected to two stirring plates respectively. A plurality of bent tubes are fixedly connected to the outer side of the lower end of the rotating tube, and the plurality of bent tubes are all connected to the rotating tube.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. A sensing membrane with an arc-shaped lower end surface is provided, and an annular convex strip is provided on the lower end surface of the sensing membrane. The use of the arc surface structure and the annular convex strip can reduce the possibility of condensation, thereby effectively avoiding the occurrence of icing.

[0013] 2. The liquid pump and the heating wire are provided, which will generate a circulating second temperature-conducting oil flow among the heating box, the spiral temperature-conducting tube, the liquid pump and the heating box. With the use of the heating wire, the temperature of the first temperature-conducting oil can be kept at a suitable temperature, and finally the temperature of the induction membrane will not be too low, thus effectively avoiding its freezing and playing an anti-icing role.

[0014] 3. When the second temperature-conducting oil is sprayed out from multiple bent pipes, it receives a reaction force, which allows the multiple bent pipes to drive the rotating pipe to rotate, so that the stirring plate and the heating wire rotate synchronously. The rotation of the heating wire will make the second temperature-conducting oil heated more evenly. Finally, the heat transfer of the spiral temperature-conducting pipe will make the overall temperature of the first temperature-conducting oil more uniform. In addition, the rotation of the stirring plate can further improve the overall temperature uniformity.

[0015] In summary, in actual use, the anti-icing structure utilizes the arc structure of the induction membrane and the annular convex strips to reduce the possibility of condensation. By circulating the temperature-conducting oil and using the heating wire, the whole is heated up in a low-temperature environment, effectively avoiding ice formation and playing an anti-icing role. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of an anti-icing structure for a pressure sensor proposed by the present invention; Figure 2 This is an enlarged schematic diagram of a heating box of an anti-icing structure for a pressure sensor proposed by the present invention; Figure 3 A top view of a sensing membrane of an anti-icing structure of a pressure sensor proposed by the present invention; Figure 4 A schematic diagram of a three-dimensional structure of a rotating tube and a bent tube connected to an anti-icing structure of a pressure sensor proposed by the present invention; Figure 5 A schematic diagram of the three-dimensional structure of a spiral temperature conducting tube of an anti-icing structure for a pressure sensor proposed by the present invention.

[0017] In the figure: 1 a first shell, 2 a second shell, 3 a sensing box, 4 a mounting port, 5 a sensing membrane, 6 a sealing plate, 7 a pressure-sensitive element, 8 a circuit board, 9 a sealing cover, 10 a liquid pump, 11 a liquid inlet pipe, 12 a liquid outlet pipe, 13 a heating box, 14 a connecting pipe, 15 a first temperature-conducting oil, 16 annular convex strips, 17 a rotary joint, 18 a rotating pipe, 19 a curved pipe, 20 a stirring plate, 21 a heating wire, 22 a spiral temperature-conducting pipe, 23 a conductive wire, 24 a mounting seat, 25 a connecting cylinder, 26 a mounting circular plate, 27 annular grooves, 28 sealing rings, 29 a cavity, 30 a second temperature-conducting oil. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0020] Reference Figure 1-Figure 5 A pressure sensor anti-icing structure includes a first shell 1 and a second shell 2. The upper end of the first shell 1 is provided with an installation opening 4, and a sealing cover 9 is installed in the installation opening 4. The use of the sealing cover 9 facilitates the subsequent maintenance work. The second shell 2 is fixed below the first shell 1. A sensing box 3 is arranged below the second shell 2. The lower end of the second shell 2 is fixedly connected to the sensing box 3 through a connecting tube 25. The second shell 2 and the sensing box 3 are connected by the connecting tube 25. A cavity 29 is arranged in the sensing box 3. The inner bottom of the sensing box 3 is provided with an installation opening 4. The sealing cover 9 is used to facilitate the subsequent maintenance work. A sensing film 5 is installed in the loading port 4, and the lower end surface of the sensing film 5 is in an arc shape. The lower end surface of the sensing film 5 is provided with an annular convex strip 16. The use of the arc surface structure and the annular convex strip 16 can reduce condensation. The upper end of the connecting tube 25 is connected to the inside of the second shell 2, and the lower end of the connecting tube 25 is connected to the inside of the cavity 29. A sealing plate 6 is provided in the second shell 2, and two pressure-sensitive elements 7 are symmetrically installed at the lower end of the sealing plate 6. The pressure-sensitive element 7 is a piezoelectric element that can sense changes in pressure. The bottom space of the second shell 2, the connecting tube 25 and the cavity 29 are commonly filled with the first temperature-conducting oil 15; As an embodiment of the present invention, a mounting circular plate 26 is fixedly connected to the outer side of the connecting cylinder 25, an annular groove 27 is provided on the outer side of the mounting circular plate 26, and a sealing ring 28 is provided in the annular groove 27 to ensure the sealing after the connection; As an embodiment of the present invention, a sensing mechanism is further included. The sensing mechanism is used to sense pressure. The sensing mechanism includes a circuit board 8 installed in the first housing 1. Two pressure-sensitive elements 7 are electrically connected to the circuit board 8 through a conductive line 23. The pressure received by the pressure-sensitive element 7 is converted into a pressure signal and then outputted, and transmitted to subsequent elements through the circuit board 8. As an embodiment of the present invention, it also includes a heating mechanism, which is used to heat the first temperature-conducting oil 15. The heating mechanism includes a spiral temperature-conducting tube 22 arranged inside the second shell 2 and the connecting tube 25. The spiral temperature-conducting tube 22 is a copper tube. The right side of the second shell 2 is fixedly connected to the heating box 13, and the right side of the first shell 1 is fixedly connected to the liquid pump 10. The liquid inlet end of the liquid pump 10 is connected to the liquid inlet pipe 11, and the other end of the liquid inlet pipe 11 is connected to the upper end of the spiral temperature-conducting tube 22. The liquid outlet end of the liquid pump 10 is connected to the liquid outlet pipe 12, and the other end of the liquid outlet pipe 12 extends to the inside of the heating box 13. The inner bottom of the heat box 13 is connected to the lower end of the spiral temperature conducting tube 22 through the connecting pipe 14. The heating box 13 is filled with the second temperature conducting oil 30. Two stirring plates 20 are symmetrically arranged in the heating box 13. The two stirring plates 20 are made of temperature conducting materials. The two stirring plates 20 are embedded with electric heating wires 21. The electric heating wires 21 are prior art and are widely used in industrial heating equipment and civil heating appliances such as metallurgical machinery, medical treatment, chemical industry, ceramics, electronics, electrical appliances, and glass. When powered on, they will generate heat. The conduction of the electric heating wires 21 is achieved through an electrical rotary joint, which ensures the conductivity of the rotating connection. As an embodiment of the present invention, a rotating tube 18 is vertically arranged in the heating box 13, and the rotating tube 18 is connected to the lower end of the liquid outlet pipe 12 through a rotating joint 17. The rotating joint 17 is a prior art. The rotating joint refers to a pipeline connection device, and the connected pipelines can rotate relatively and can be used to transmit gas, liquid, oil and other media. The compact design structure adopts a flange connection. The rotating tube 18 is a tube body sealed at the lower end surface. The two sides of the rotating tube 18 are fixedly connected to the two stirring plates 20 respectively. The outer side of the lower end of the rotating tube 18 is fixedly connected to a plurality of bent pipes 19, and the plurality of bent pipes 19 are all connected to the rotating tube 18. The plurality of bent pipes 19 are in a Figure 4 As shown, when the fluid is discharged, it is subjected to a reaction force, which allows the rotating tube 18 to rotate.

[0021] In the present invention, when in use, the lower end surface of the sensing film 5 is provided with an annular convex strip 16. The use of the arc surface structure and the annular convex strip 16 can reduce condensation, and the pressure sensed by the sensing film 5 can be transmitted to the pressure sensitive element 7 through the pressure transmission of the first temperature conducting oil 15, and the pressure signal is converted into an electrical signal through the pressure sensitive element 7 to realize pressure sensing; When the overall temperature of the structure is low, the liquid pump 10 and the electric heating wire 21 can be started. After the liquid pump 10 is started, the second temperature-conducting oil 30 circulating through the heating box 13, the spiral temperature-conducting tube 22, the liquid pump 10 and the heating box 13 will flow, and the start of the electric heating wire 21 can heat the second temperature-conducting oil 30. By heat transfer, the temperature can be transferred to the spiral temperature-conducting tube 22, and then to the first temperature-conducting oil 15. In this way, the temperature of the first temperature-conducting oil 15 can be kept at a suitable temperature, and finally the temperature of the sensing membrane 5 will not be too low, which effectively avoids its freezing and plays an anti-icing role. In the above process, when the second temperature conducting oil 30 is sprayed out from the multiple bent pipes 19, it receives a reaction force, which allows the multiple bent pipes 19 to drive the rotating tube 18 to rotate, so that the stirring plate 20 and the heating wire 21 rotate synchronously. The rotation of the heating wire 21 can make the second temperature conducting oil 30 heated more evenly, and finally the heat transfer of the spiral temperature conducting pipe 22 can make the overall temperature of the first temperature conducting oil 15 more uniform. In addition, the rotation of the stirring plate 20 can further improve the overall temperature uniformity.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pressure sensor anti-icing structure, characterized in that: include: A first shell (1) and a second shell (2), wherein the second shell (2) is fixed below the first shell (1), an induction box (3) is arranged below the second shell (2), the lower end of the second shell (2) is fixedly connected to the induction box (3) via a connecting tube (25), a cavity (29) is arranged in the induction box (3), an installation opening (4) is provided at the inner bottom of the induction box (3), a sensing membrane (5) is installed in the installation opening (4), the upper end of the connecting tube (25) is communicated with the interior of the second shell (2), the lower end of the connecting tube (25) is communicated with the interior of the cavity (29), a sealing plate (6) is arranged in the second shell (2), two pressure-sensitive elements (7) are symmetrically installed at the lower end of the sealing plate (6), and the bottom space of the second shell (2), the connecting tube (25) and the cavity (29) are all filled with a first temperature-conducting oil (15); A sensing mechanism, wherein the sensing mechanism is used to sense pressure; A heating mechanism, wherein the heating mechanism is used to heat the first temperature conducting oil (15).

2. The anti-icing structure of a pressure sensor according to claim 1, characterized in that: The upper end of the first shell (1) is provided with a mounting opening (4), and a sealing cover (9) is installed in the mounting opening (4).

3. The anti-icing structure of a pressure sensor according to claim 1, characterized in that: The outer side of the connecting cylinder (25) is fixedly connected to a mounting circular plate (26), the outer side of the mounting circular plate (26) is provided with an annular groove (27), and a sealing ring (28) is provided in the annular groove (27).

4. The anti-icing structure of a pressure sensor according to claim 1, characterized in that: The lower end surface of the sensing film (5) is in the shape of an arc surface, and an annular convex strip (16) is provided on the lower end surface of the sensing film (5).

5. The anti-icing structure of a pressure sensor according to claim 1, characterized in that: The sensing mechanism comprises a circuit board (8) installed in the first housing (1), and the two pressure-sensitive elements (7) are electrically connected to the circuit board (8) via a conductive wire (23).

6. The anti-icing structure of a pressure sensor according to claim 1, characterized in that: The heating mechanism comprises a spiral temperature conducting tube (22) arranged inside a second shell (2) and a connecting tube (25); a heating box (13) is fixedly connected to the right side of the second shell (2); a liquid pump (10) is fixedly connected to the right side of the first shell (1); a liquid inlet end of the liquid pump (10) is connected to a liquid inlet tube (11); the other end of the liquid inlet tube (11) is connected to the upper end of the spiral temperature conducting tube (22); a liquid outlet end of the liquid pump (10) is connected to a liquid outlet tube (12); the other end of the liquid outlet tube (12) extends to the inside of the heating box (13); and the inner bottom of the heating box (13) is connected to the lower end of the spiral temperature conducting tube (22) via a connecting tube (14).

7. The anti-icing structure of a pressure sensor according to claim 6, characterized in that: The heating box (13) is filled with a second temperature-conducting oil (30), and two stirring plates (20) are symmetrically arranged in the heating box (13). Both stirring plates (20) are made of a temperature-conducting material, and both stirring plates (20) are embedded with a heating wire (21).

8. The anti-icing structure for a pressure sensor according to claim 7, characterized in that: A rotating tube (18) is vertically arranged in the heating box (13). The rotating tube (18) is connected to the lower end of the liquid outlet tube (12) via a rotating joint (17). The rotating tube (18) is a tube body with a sealed lower end surface. Both sides of the rotating tube (18) are respectively fixedly connected to two stirring plates (20). A plurality of bent tubes (19) are fixedly connected to the outer side of the lower end of the rotating tube (18). The plurality of bent tubes (19) are all connected to the rotating tube (18).

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