Refrigerant ceramic pressure sensor

Abstract

The invention discloses a refrigerant ceramic pressure sensor, and particularly relates to the field of pressure sensors, the refrigerant ceramic pressure sensor comprises an installation supporting structure and a sensing unit, the installation supporting structure comprises a shell, a connector is detachably installed on the shell, and an inner support is arranged between the shell and the connector; the sensing unit comprises a mounting seat, the mounting seat is arranged in the inner support, the periphery of the inner support is sleeved with an insulating pad, the periphery of the insulating pad is sleeved with an insulating film, and the bottom of the mounting seat is provided with a rubber gasket. The whole sensor is divided into an internal core working module and an external shell structure, the internal structure and the external structure are divided into two complete parts, the internal part and the external part are separated by an insulating pad and an insulating film insulating material, and an internal mounting seat is the complete core working module of the sensor. The filling of the insulating material weakens the correlation between the internal working module and the external electromagnetic environment, greatly improves the anti-static strength of the sensor, and reduces the requirement for the anti-interference capability of an internal circuit at the same time.

Description

Technical Field

[0001] This invention relates to the field of pressure sensor technology, and more specifically, to a refrigerant ceramic pressure sensor. Background Technology

[0002] A ceramic pressure sensor is a strain gauge pressure sensing device based on the piezoresistive effect of a thick-film resistor. It is a core component in the field of pressure measurement. The pressure sensor is mainly composed of a ceramic diaphragm, a ceramic ring, and a cover plate. A thick-film printed Wheatstone bridge circuit is integrated on the surface of the diaphragm, which converts pressure into a linear voltage signal through the piezoresistive effect.

[0003] Because the application environment of ceramic pressure sensors in commercial air conditioners is subject to complex interference factors such as high-intensity electromagnetic interference and power supply voltage fluctuations, the circuit design of existing ceramic pressure sensors has not been specifically optimized for such scenarios. They lack effective electromagnetic shielding and voltage stabilization mechanisms, which makes the signal easily distorted during data transmission, thereby affecting the accuracy of the control unit's judgment. In addition, the power supply voltage adaptation range of existing ceramic pressure sensors in commercial air conditioners is narrow, and they are prone to malfunctions when the voltage fluctuates, which limits their application in complex power supply environments. Summary of the Invention

[0004] The present invention provides a refrigerant ceramic pressure sensor, which aims to solve the problem that existing ceramic pressure sensors in commercial air conditioners lack effective electromagnetic shielding and voltage stabilization mechanisms, resulting in signal distortion during data transmission and affecting the accuracy of the control unit's judgment.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a refrigerant ceramic pressure sensor, comprising a mounting support structure and a sensitive unit. The mounting support structure includes a housing, on which a connector is detachably mounted, and an inner support is provided between the housing and the connector. The sensitive unit includes a mounting base, which is located inside the inner support. An insulating pad is fitted around the outer periphery of the inner support, and an insulating film is fitted around the outer periphery of the insulating pad. A rubber gasket is provided at the bottom of the mounting base, and an O-ring is provided inside the insulating pad.

[0006] In a preferred embodiment, a ceramic core is mounted on the mounting base, a conditioning chip is mounted on the ceramic core, and a PCBA circuit board is provided on one side of the conditioning chip.

[0007] In a preferred embodiment, the outer shell is made of stainless steel, the insulating pad is made of high-temperature resistant silicone rubber, the inner tray is made of engineering plastic, and the insulating film is a fluororubber ceramic fiber film.

[0008] In a preferred embodiment, an annular groove is provided on the surface of the inner tray, and the insulating pad is fixed to the inner tray by the buckle and the annular groove. A protective net is provided around the outer periphery of the insulating pad.

[0009] In a preferred embodiment, a limiting protrusion is installed on the outer periphery of the housing. The limiting protrusion has a U-shaped groove, and both ends of the U-shaped groove have guide slopes. The limiting protrusion has an opening at the end with the lower height of the guide slope.

[0010] In a preferred embodiment, a honeycomb aluminum core block is fixedly provided on the inner wall of the outer shell at the position corresponding to the limiting protrusion, and a thinning groove is provided on the inner wall of the outer shell at a position away from the honeycomb aluminum core block.

[0011] In a preferred embodiment, the inner wall of the outer shell is provided with annular reinforcing ribs, and the annular reinforcing ribs are staggered with the honeycomb aluminum core blocks. A filling layer is provided between the honeycomb aluminum core blocks and the inner support, as well as between the annular reinforcing ribs and the inner support.

[0012] In a preferred embodiment, an insulation resistance sensor is mounted on the mounting base, a micro strain gauge is installed inside the thinned groove, and a detection groove is provided on one side of the micro strain gauge.

[0013] The beneficial effects of this invention are as follows: This invention divides the entire structure into an internal core working module and an external shell structure, creating two complete parts. The two parts are separated by insulating pads and insulating films. The internal mounting base is the complete core working module of the sensor. The filling of insulating material weakens the correlation between the internal working module and the external electromagnetic environment, greatly improving the sensor's anti-static strength and reducing the requirements for the anti-interference capability of the internal circuit.

[0014] This invention effectively prevents the insulating pad from being punctured by sharp objects by wrapping a protective mesh around its outer surface without affecting its insulation performance.

[0015] This invention uses a limiting protrusion and a honeycomb aluminum core block as the first barrier against external pressure on the outer shell, strengthening the installation surface of the outer shell which is susceptible to pressure, while avoiding excessive overall weight increase, enhancing the rigidity and deformation resistance of the outer shell itself, reducing the transmission of compressive stress to the internal insulation layer, and guiding the dust, water and other debris that enter the U-shaped groove to the opening for discharge through the guide slope. It is especially suitable for the slight vibration during the operation of air conditioners, as the vibration can accelerate the discharge of dust and other debris, preventing the accumulation of debris inside the U-shaped groove from affecting the buffering performance.

[0016] This invention improves the radial compressive strength of the outer shell through the ring-shaped reinforcing ribs and the filling layer, preventing the outer shell from collapsing inward when squeezed. This does not affect the insulation performance, and the elasticity of the colloid disperses the compressive stress, preventing the insulation layer from tearing due to compression.

[0017] This invention uses micro strain gauges and insulation resistance sensors to monitor the deformation of the outer casing and the insulation performance of the insulating film. In case of a fault, it can trigger an early warning to prompt the user to check in time. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the mounting base structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the insulating pad structure of the present invention.

[0021] Figure 4 This is a top view of the outer shell structure of the present invention.

[0022] Figure 5 For the present invention Figure 4 An enlarged schematic diagram of the structure at point A.

[0023] Figure 6 For the present invention Figure 4 Enlarged schematic diagram of the structure at point B.

[0024] The attached figures are labeled as follows: 1. Outer shell; 11. Limiting protrusion; 111. U-shaped groove; 112. Guide slope; 113. Opening; 12. Honeycomb aluminum core block; 13. Annular reinforcing rib; 14. Filling layer; 15. Thinning groove; 16. Micro strain gauge; 17. Detection groove; 2. Connector; 3. Mounting base; 31. Ceramic core; 32. Conditioning chip; 33. PCBA circuit board; 34. Insulation resistance sensor; 4. Insulating pad; 41. Protective net; 5. Inner support; 6. Insulating film; 7. Rubber gasket; 8. O-ring. Detailed Implementation

[0025] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0026] Refer to the instruction manual appendix Figure 1 and Figure 2 A refrigerant ceramic pressure sensor includes a mounting support structure and a sensing unit. The mounting support structure includes a housing 1, on which a connector 2 is detachably mounted, and an inner support 5 is provided between the housing 1 and the connector 2. The sensing unit includes a mounting base 3, which is located inside the inner support 5. An insulating pad 4 is fitted around the outer periphery of the inner support 5, and an insulating film 6 is fitted around the outer periphery of the insulating pad 4. A rubber gasket 7 is provided at the bottom of the mounting base 3, and an O-ring 8 is provided inside the insulating pad 4.

[0027] It should be noted that the function of the outer shell 1 is not only to isolate the internal module from the external environment and resist the corrosion of the external environment, but also to adapt to the installation position structure. The installation support structure consists of the outer shell 1, connector 2, insulating pad 4, inner support 5, insulating film 6, rubber gasket 7 and O-ring 8. Its main functions are to provide installation sealing, structural support and anti-static. The insulating pad 4 and insulating film 6 are combined to form an insulating layer.

[0028] Refer to the instruction manual appendix Figure 2 A ceramic core 31 is mounted on the mounting base 3, a conditioning chip 32 is mounted on the ceramic core 31, and a PCBA circuit board 33 is provided on one side of the conditioning chip 32.

[0029] It should be noted that the core of the sensing unit consists of a ceramic core 31, a conditioning chip 32, and a PCBA circuit board 33 on the mounting base 3. Its main functions are signal processing, compensation, and output. The internal pressure sensing unit can replace different ceramic cores 31 according to different ranges to adapt to different working environments. The conditioning chip 32 is selected as an industrial-grade wide-temperature high-precision model, such as the ADIAD7799 chip. Its communication module supports sleep-wake mode and has an operating temperature range of -55℃ to 175℃. The PCBA circuit board 33 is made of polyimide high-temperature resistant material, and the solder joints are treated with high-temperature anti-oxidation treatment. The PCBA circuit board 33 is treated with conformal coating to isolate corrosive gases.

[0030] Refer to the instruction manual appendix Figure 1 The outer shell 1 is made of stainless steel, the insulating pad 4 is made of high-temperature resistant silicone rubber, the inner tray 5 is made of engineering plastic, and the insulating film 6 is made of fluororubber ceramic fiber film.

[0031] It should be noted that the outer shell 1 is made of 316L stainless steel or titanium alloy, with PTFE spray coating on the surface. The coating thickness is ≥50μm, which is resistant to salt spray and acid and alkali gas corrosion. The outer shell 1 and connector 2 serve as external connection structures, and the structure can be changed according to different working interfaces, which greatly improves the overall application flexibility of the sensor. The insulating pad 4 is made of high temperature resistant silicone rubber with a breakdown voltage ≥5kV to avoid insulation performance degradation under extreme temperatures. The inner support 5 is made of engineering plastic to avoid electrochemical corrosion caused by contact between metal materials and corrosive media. The insulating film 6 is made of fluororubber ceramic fiber film with a temperature resistance of -70℃ to 200℃.

[0032] In this embodiment, the specific implementation scenario is as follows: The mounting support structure consists of a shell 1, a connector 2, an insulating pad 4, an inner support 5, an insulating film 6, a rubber gasket 7, and an O-ring 8. Its main functions are to provide installation sealing, structural support, and anti-static properties. The core part of the sensitive unit consists of a ceramic core 31, a conditioning chip 32, and a PCBA circuit board 33 on the mounting base 3. Its main functions are signal processing, compensation, and output. The sensitive unit and the connector 2 are assembled into a whole by the inner support 5, building a complete sensor input and output platform. By filling the inner side of the shell 1 with the insulating pad 4 and the insulating film 6, a high-strength anti-static effect is achieved. The O-ring 8 achieves a sealing effect against the external environment. The whole structure is divided into an internal core working module and an external shell structure, dividing the internal and external structures into two complete parts. The two parts are separated by insulating materials such as the insulating pad 4 and the insulating film 6. The internal mounting base 3 is the complete core working module of the sensor. The filling of the insulating material weakens the correlation between the internal working module and the external electromagnetic environment, greatly improving the sensor's anti-static strength, and also reducing the requirements for the anti-interference capability of the internal circuit.

[0033] Refer to the instruction manual appendix Figure 3 and Figure 4 The inner support 5 has an annular groove on its surface. The insulating pad 4 is fixed to the inner support 5 by the buckle and the annular groove. The outer periphery of the insulating pad 4 is covered with a protective net 41.

[0034] It should be noted that the aperture of the protective net 41 is ≤1mm and the thickness is 0.1mm. It does not affect the insulation performance, but it can effectively prevent the insulating pad 4 from being punctured by sharp objects, such as burrs generated by the deformation of the outer shell 1 when squeezed.

[0035] Refer to the instruction manual appendix Figure 4 and Figure 5 A limiting protrusion 11 is installed on the outer periphery of the outer shell 1. A U-shaped groove 111 is provided on the limiting protrusion 11. Both ends of the U-shaped groove 111 are provided with guide slopes 112. An opening 113 is provided on the end of the limiting protrusion 11 corresponding to the lower end of the guide slope 112.

[0036] It should be noted that the limiting protrusion 11 is made of elastic plastic material. The limiting protrusion 11 is set at the installation position of the outer shell 1. The guide slope 112 is a straight slope or an arc slope. The opening 113 is a through hole. The dust and debris accumulated inside the U-shaped groove 111 are guided to the opening 113 through the guide slope 112 and discharged.

[0037] Refer to the instruction manual appendix Figure 4 and Figure 6 A honeycomb aluminum core block 12 is fixedly provided on the inner wall of the outer shell 1 at the position corresponding to the limiting protrusion 11, and a thinning groove 15 is provided on the inner wall of the outer shell 1 at the position offset from the honeycomb aluminum core block 12.

[0038] It should be noted that, as the first barrier against external pressure, the outer shell 1 has its wall thickness changed from a uniform design to thickening the key stress areas and thinning the non-stress areas. The focus is on strengthening the installation surface of the outer shell 1 which is susceptible to pressure, while avoiding excessive overall weight increase. This enhances the rigidity and deformation resistance of the outer shell 1 itself, and reduces the transmission of compressive stress to the internal insulation layer. The honeycomb aluminum core block 12 has a closed-cell honeycomb structure inside, which maintains insulation performance and has good compressive resilience performance. It can absorb the extrusion impact force and prevent the insulation layer from failing due to deformation.

[0039] Refer to the instruction manual appendix Figure 5 The inner wall of the outer shell 1 is provided with an annular reinforcing rib 13, and the annular reinforcing rib 13 is staggered with the honeycomb aluminum core block 12. A filling layer 14 is provided between the honeycomb aluminum core block 12 and the inner support 5, as well as between the annular reinforcing rib 13 and the inner support 5.

[0040] It should be noted that the annular reinforcing rib 13 and the honeycomb aluminum core block 12 are staggered vertically, forming a grid support structure in the contact area between the inner wall of the outer shell 1 and the inner support 5, which improves the radial compressive strength of the outer shell 1 and prevents the outer shell 1 from collapsing inward when squeezed. Flexible epoxy sealant is filled in the gap between the outer shell 1 and the inner support 5 to form a filling layer 14, which does not affect the insulation performance and can disperse the compressive stress through the elasticity of the adhesive, preventing the insulation layer from tearing due to compression.

[0041] Refer to the instruction manual appendix Figure 6 An insulation resistance sensor 34 is installed on the mounting base 3. A micro strain gauge 16 is installed inside the thinning groove 15. A detection groove 17 is provided on one side of the micro strain gauge 16.

[0042] It should be noted that an insulation resistance sensor 34 is integrated on the mounting base 3. The detection end of the insulation resistance sensor 34 is set at the detection groove 17 to monitor the insulation resistance value of the insulation film 6 in real time. Its monitoring accuracy is ±1MΩ, and the preset threshold is ≤50MΩ. When the insulation resistance is lower than the threshold, an alarm signal is output through the signal interface, such as a voltage signal jump, an LED indicator light stays on, or a remote warning is pushed through the IoT module. A micro strain gauge 16 with a thickness ≤0.1mm is attached to the inner surface of the thinning groove 15 to monitor the deformation of the shell 1 in real time. When the deformation of the shell 1 exceeds the threshold, an alarm is triggered to prompt the user to check in time and avoid further compression that could damage the insulation layer.

[0043] In this embodiment, the specific implementation scenario is as follows: by wrapping a protective mesh 41 around the outer surface of the insulating pad 4, the insulating pad 4 is effectively prevented from being punctured by sharp objects without affecting the insulation performance. By setting the limiting protrusion 11 and the honeycomb aluminum core block 12 as the first barrier against external pressure on the outer shell 1, the installation surface of the outer shell 1 which is susceptible to pressure is strengthened. At the same time, the overall weight is not increased too much, the rigidity and deformation resistance of the outer shell 1 are enhanced, and the pressure stress is reduced from being transmitted to the internal insulation layer. Dust, water and other debris that enter the U-shaped groove 111 are guided to the opening 11 by the guide slope 112. 3. Discharge, especially suitable for slight vibration during air conditioner operation. Vibration can accelerate the discharge of dust and other debris, preventing debris from accumulating inside the U-shaped groove 111 and affecting the buffering performance. The annular reinforcing rib 13 and filling layer 14 can improve the radial compressive strength of the outer shell 1, preventing the outer shell 1 from collapsing inward when squeezed. It does not affect the insulation performance, and can disperse the compressive stress through the elasticity of the colloid, preventing the insulation layer from tearing due to compression. The deformation of the outer shell 1 and the insulation performance of the insulation film 6 can be monitored through the micro strain gauge 16 and insulation resistance sensor 34. In case of failure, an early warning can be triggered to prompt the user to check in time.

[0044] Working principle: The installation support structure consists of a housing 1, a connector 2, an insulating pad 4, an inner support 5, an insulating film 6, a rubber gasket 7, and an O-ring 8. Its main functions are to provide installation sealing, structural support, and anti-static properties.

[0045] II. The core of the sensing unit consists of a ceramic core 31, a conditioning chip 32, and a PCBA circuit board 33 on the mounting base 3. Its main function is to process, compensate, and output signals. The sensing unit and connector 2 are assembled into a whole through the inner bracket 5 to build a complete sensor input and output platform.

[0046] Third, by filling the inner side of the outer shell 1 with insulating pad 4 and insulating film 6, a high-strength antistatic effect is achieved, and the O-ring 8 achieves a sealing effect against the external environment.

[0047] Fourth, by wrapping a protective net 41 around the outer surface of the insulating pad 4, the insulating pad 4 can be effectively prevented from being punctured by sharp objects without affecting its insulation performance.

[0048] Fifth, by setting the limiting protrusion 11 and the honeycomb aluminum core block 12 as the first barrier against external pressure, the installation surface of the outer shell 1 which is susceptible to pressure is strengthened, while avoiding excessive overall weight increase, enhancing the rigidity and deformation resistance of the outer shell 1, and reducing the transmission of compressive stress to the internal insulation layer.

[0049] VI. The radial compressive strength of the outer shell 1 can be improved by the ring reinforcing rib 13 and the filling layer 14, so as to prevent the outer shell 1 from collapsing inward when squeezed. This does not affect the insulation performance, and the compressive stress can be dispersed by the elasticity of the colloid, preventing the insulation layer from tearing due to compression.

[0050] 7. The deformation of the housing 1 and the insulation performance of the insulating film 6 can be monitored by the micro strain gauge 16 and the insulation resistance sensor 34. In case of failure, an early warning can be triggered to prompt the user to check in time.

[0051] The above embodiments are merely illustrative of several implementations of the present invention, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A refrigerant ceramic pressure sensor, comprising a mounting support structure and a sensing unit, characterized in that: The mounting support structure includes a housing (1), on which a connector (2) is detachably mounted, and an inner support (5) is provided between the housing (1) and the connector (2). The sensitive unit includes a mounting base (3), which is located inside the inner support (5). The outer periphery of the inner support (5) is covered with an insulating pad (4), and the outer periphery of the insulating pad (4) is covered with an insulating film (6). The bottom of the mounting base (3) is provided with a rubber pad (7), and the inside of the insulating pad (4) is provided with an O-ring (8).

2. The refrigerant ceramic pressure sensor according to claim 1, characterized in that: A ceramic core (31) is mounted on the mounting base (3), and a conditioning chip (32) is mounted on the ceramic core (31). A PCBA circuit board (33) is provided on one side of the conditioning chip (32).

3. The refrigerant ceramic pressure sensor according to claim 2, characterized in that: The outer shell (1) is made of stainless steel, the insulating pad (4) is made of high-temperature resistant silicone rubber, the inner support (5) is made of engineering plastic, and the insulating film (6) is made of fluororubber ceramic fiber film.

4. A refrigerant ceramic pressure sensor according to claim 3, characterized in that: The inner support (5) has an annular groove on its surface. The insulating pad (4) is fixed to the inner support (5) by a buckle and the annular groove. The outer periphery of the insulating pad (4) is covered with a protective net (41).

5. A refrigerant ceramic pressure sensor according to claim 4, characterized in that: The outer periphery of the outer shell (1) is equipped with a limiting boss (11), and a U-shaped groove (111) is provided on the limiting boss (111). Both ends of the U-shaped groove (111) are provided with guide slopes (112), and an opening (113) is provided at the end of the limiting boss (11) corresponding to the lower height of the guide slope (112).

6. A refrigerant ceramic pressure sensor according to claim 5, characterized in that: The inner wall of the outer shell (1) is fixedly provided with a honeycomb aluminum core block (12) at the position corresponding to the limiting protrusion (11), and a thinning groove (15) is provided on the inner wall of the outer shell (1) at a position away from the honeycomb aluminum core block (12).

7. A refrigerant ceramic pressure sensor according to claim 6, characterized in that: The inner wall of the outer shell (1) is provided with annular reinforcing ribs (13), and the annular reinforcing ribs (13) and the honeycomb aluminum core block (12) are staggered. A filling layer (14) is provided between the honeycomb aluminum core block (12) and the inner support (5) and between the annular reinforcing ribs (13) and the inner support (5).

8. A refrigerant ceramic pressure sensor according to claim 7, characterized in that: An insulation resistance sensor (34) is installed on the mounting base (3), and a micro strain gauge (16) is installed inside the thinning groove (15). A detection groove (17) is provided on one side of the micro strain gauge (16).

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