A moisture-proof pressure sensor

Abstract

This invention relates to the field of pressure sensor technology and discloses a moisture-proof pressure sensor, comprising a housing assembly. The housing assembly includes a first housing, a second housing, and a third housing connected in sequence. A pressure chip is installed inside the first housing. An annular groove is provided on the inner wall of the first housing. A ring body is fixed to the outer side of the pressure chip, and the ring body is fitted into the annular groove, thereby fixing the pressure chip inside the first housing. An air storage assembly is installed inside the second housing. A movable block is connected to the movable end of the air storage assembly, and the bottom end of the movable block contacts the end face of the pressure chip. During the expansion of the air storage assembly, air inside the housing assembly passes through a drying component and enters the air bladder, drawing air from the first and second housings into the air storage assembly, thereby reducing the air inside the cavity of the housing assembly and effectively reducing moisture inside the housing assembly.

Description

Technical Field

[0001] This invention relates to the field of pressure sensor technology, specifically to a moisture-proof pressure sensor. Background Technology

[0002] Pressure sensors are widely used in numerous fields, such as industrial automation, automotive engineering, and environmental monitoring. In these applications, sensors often need to operate under varying environmental conditions. For example, industrial environments may experience significant variations in temperature and humidity; in automotive engineering, the engine compartment has high temperatures and unstable humidity, while the external environment also varies considerably depending on the season and weather. Especially for applications requiring high-precision measurements, the impact of environmental factors on sensor performance cannot be ignored. Moisture is one such key factor, as it can interfere with the normal operation of the sensor.

[0003] In the housing assembly of a pressure sensor, when moisture is present, it easily condenses at low temperatures. The moisture changes from a gaseous to a liquid state at low temperatures, and this liquid water accumulates within the cavity of the housing assembly. Since the pressure sensor contains electronic components, and water is a good conductor, contact with this accumulated liquid water can cause a short circuit. A short circuit will result in inaccurate sensor measurements and may even damage the sensor, thus affecting the normal operation of the entire system.

[0004] Traditional pressure sensors may not have adequately considered moisture protection in their design. Their housing structures may be relatively simple, lacking effective measures to prevent moisture ingress and accumulation. Although some sensors may employ a sealed structure, the sealing effect may deteriorate over long-term use or under certain environmental stresses, thus failing to prevent moisture intrusion. Summary of the Invention

[0005] The purpose of this invention is to provide a moisture-proof pressure sensor to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0007] This invention relates to a moisture-proof pressure sensor, comprising a housing assembly.

[0008] The housing assembly includes a first housing, a second housing, and a third housing connected in sequence;

[0009] The first shell, the second shell, and the third shell form a cavity;

[0010] A pressure chip is installed inside the first housing. An annular groove is provided on the inner wall of the first housing. A ring body is fixed to the outside of the pressure chip. The ring body is installed in the annular groove, thereby realizing the pressure chip is fixedly installed inside the first housing.

[0011] Meanwhile, sealant is filled between the inner wall of the first housing and the outer surface of the pressure chip to achieve sealed installation of the pressure chip;

[0012] The second housing contains a gas storage component, and the movable end of the gas storage component is connected to a moving block. The bottom end of the moving block is in contact with the end face of the pressure chip.

[0013] Furthermore, the main body of the first housing is a base, and the two ends of the base are respectively provided with an upper connecting end and a lower connecting end. The lower connecting end is connected to the pipe to be tested, thereby realizing the internal communication between the base and the pipe to be tested.

[0014] The base is a casting structure. The outer diameter of the upper connecting end of the base is larger than the outer diameter of the lower connecting end of the base. The detection end of the pressure chip extends into the lower connecting end, and the liquid contacts the detection end of the pressure chip.

[0015] The main body of the second housing is a cylindrical body, which is connected to the upper connecting end by an internal thread at one end and an external thread at the other end.

[0016] The cylindrical body is a cast structure;

[0017] The other end of the cylinder is fitted with a third housing, the end of which is provided with an internal thread, and the internal thread of the third housing engages with the external thread at the other end of the cylinder.

[0018] This achieves a sealed connection between the base and the cylinder, and a sealed connection between the cylinder and the third housing, wherein the third housing is provided with a wire outlet hole.

[0019] Furthermore, the interior of the cylinder is provided with a partition, and the side of the partition is provided with a waist-shaped hole and a guide hole. The gas storage component is fixedly installed on the partition. The moving block is provided with columns on both sides. The two columns are located on both sides of the gas storage component, and the ends of the columns slide along the guide holes.

[0020] A screw hole is provided in the middle of the partition plate, and the bottom end of the gas storage component is installed in the screw hole to fix the gas storage component. The outer diameter of the gas storage component is smaller than the inner diameter of the cylinder, and the gas storage component can expand and contract inside the cylinder.

[0021] The main body of the gas storage component is an air bladder, and one end of the air bladder is provided with a lower mounting hole, in which a one-way valve is installed.

[0022] The one-way valve includes a valve seat, a ball, and a first spring. The ball and the first spring are installed inside the valve seat, and the valve seat is fitted into the lower mounting hole.

[0023] The bottom end of the valve seat is provided with external threads, and the bottom end of the valve seat is installed in the threaded hole through the external threads. The top end of the valve seat is installed in the lower mounting hole through the external threads. The top end of the valve seat is bonded to the lower mounting hole with sealant. The lower mounting hole is provided with a stepped hole. One end of the first spring is limited through the stepped hole, and the other end of the first spring pushes the ball to close the air inlet of the valve seat.

[0024] The other end of the airbag is provided with an upper mounting hole, and a drying component is installed on the inner end of the lower mounting hole. The drying component includes an outer cylinder and an inner cylinder.

[0025] An outer cylinder is installed on the outside of the inner cylinder, and a cavity is formed between the outer cylinder and the inner cylinder. The cavity is filled with a desiccant, which is one or more of silica gel desiccant, mineral desiccant, and molecular sieve desiccant. A through groove is provided on the inner wall of both the outer cylinder and the inner cylinder.

[0026] The end of the outer cylinder is located inside the upper mounting hole.

[0027] Furthermore, a second spring is installed inside the third housing. The second spring is located above the movable block, and the second spring pushes the column end of the movable block to press against the end of the base.

[0028] When assembling different components, the end of the gas storage component is first installed in the screw hole of the partition to fix the gas storage component. At the same time, a movable block is sleeved on the outside of the gas storage component, and the column end of the movable block is located in the guide hole.

[0029] The second spring is installed at the end of the moving block and fitted with the third housing. After installation, the second spring pushes the moving block to compress the air bag, and the air inside the air bag is discharged through the drying component.

[0030] Among them, the outer cylinder has multiple sets of through grooves located at the bottom end of the outer cylinder. When the airbag is fully compressed, part of the through grooves of the outer cylinder is connected to the cavity of the shell assembly.

[0031] Meanwhile, the data line of the pressure chip passes through the guide hole, the groove and the outlet hole of the third housing in sequence, and extends to the outside of the housing assembly through the outlet hole of the third housing. At the same time, a sleeve is installed inside the outlet hole of the third housing and fitted onto the outside of the data line, thereby achieving the sealing of the outlet port of the third housing.

[0032] When the cylinder body and the base are spliced ​​together, the upper connecting end is installed inside the port of the cylinder body. At the same time, the end of the upper connecting end, which is screwed in, pushes the moving block to compress the second spring. The moving block drives the upper end of the gas storage component to move, thereby realizing the expansion of the gas storage component.

[0033] During the expansion of the gas storage component, the air pressure inside the airbag gradually decreases, causing the sphere to compress the first spring. The air inside the housing component enters the airbag through the drying component, drawing the air from the first and second housings into the gas storage component. This reduces the air inside the cavity of the housing component, effectively reducing the moisture inside the housing component and preventing moisture from condensing and accumulating in a low-temperature environment, which could cause short circuits in electronic components.

[0034] At the same time, the air inside the housing component enters the air storage component, and the air is dried by the drying component.

[0035] After the gas storage component draws in air from inside the housing component, the inside of the housing component is in a low-pressure environment. The external air pressure pushes the mating threaded surfaces together to press tightly, thereby improving the sealing performance.

[0036] During disassembly, the first housing and the second housing are separated first. After the first housing and the second housing are separated, the second spring pushes the moving block to compress the air storage component until the upper mounting hole of the airbag slides to the bottom of the through groove of the outer cylinder, so that the air inside the airbag can be discharged.

[0037] Furthermore, the movable block has grooves that correspond to the waist-shaped holes, which facilitates the installation of data cables.

[0038] Furthermore, a sealing ring is fitted on the outer side of the base, with both ends of the sealing ring fitted on the outer side of the base, and an arched structure in the middle of the sealing ring. The ports of the cylinder are distributed correspondingly to the sealing ring.

[0039] A convex ring is formed between the center of the sealing ring and the outer wall of the base. After the cylinder is fully installed, the port of the cylinder is pressed against the outside of the convex ring, and the surface of the convex ring fits against the inside of the port of the cylinder, thereby achieving a seal and improving the sealing effect.

[0040] The present invention has the following beneficial effects:

[0041] (1) During the expansion of the gas storage component, the air pressure inside the airbag gradually decreases, thereby compressing the first spring. The air inside the housing component enters the airbag through the drying component, drawing the air from the first and second housings into the interior of the gas storage component. This reduces the air inside the cavity of the housing component, effectively reducing the water vapor inside the housing component and preventing the water vapor inside the housing component from condensing and accumulating in a low-temperature environment, which could cause a short circuit in the electronic components.

[0042] (2) In this invention, after the air storage component draws in the air inside the housing component, the inside of the housing component is in a low-pressure environment. The external air pressure pushes the mating threaded surfaces to stick together, thereby improving the sealing performance.

[0043] (3) A convex ring is formed between the middle of the sealing ring and the outer wall of the base. After the cylinder is fully installed, the port of the cylinder is pressed against the outside of the convex ring, and the surface of the convex ring is attached to the inside of the port of the cylinder, thereby achieving a seal, improving the sealing effect, and preventing water vapor from entering.

[0044] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the overall invention;

[0047] Figure 2 This is a cross-sectional view of the present invention;

[0048] Figure 3 This is a partial unfolded schematic diagram of the present invention;

[0049] Figure 4 This is a partial schematic diagram of the present invention;

[0050] Figure 5 For the present invention Figure 4 A cross-sectional diagram;

[0051] Figure 6 This is an exploded view of the present invention;

[0052] Figure 7 This is a partial exploded view of the present invention;

[0053] Figure 8 This is a cross-sectional schematic diagram of the second housing of the present invention;

[0054] Figure 9 This is a schematic diagram of the gas storage component of the present invention;

[0055] Figure 10 This is a cross-sectional view of the airbag of the present invention;

[0056] Figure 11 This is a cross-sectional schematic diagram of the one-way valve of the present invention;

[0057] Figure 12 This is a cross-sectional schematic diagram of the drying component of the present invention;

[0058] The attached diagram lists the components represented by each number as follows:

[0059] In the diagram: 1. First housing; 101. Base; 102. Upper connecting end; 103. Lower connecting end; 2. Pressure chip; 3. Second housing; 301. Cylinder; 302. Partition; 3021. Waist-shaped hole; 3022. Guide hole; 4. Gas storage assembly; 401. Airbag; 4011. Lower mounting hole; 4012. Upper mounting hole; 402. One-way valve; 4021. Valve seat; 4022. Ball; 4023. First spring; 403. Drying assembly; 4031. Outer cylinder; 4032. Inner cylinder; 5. Moving block; 501. Groove; 502. Column; 6. Third housing; 7. Sealing ring; 8. Second spring. Detailed Implementation

[0060] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] Please see Figures 1-12 As shown, the present invention is a moisture-proof pressure sensor, including a housing assembly.

[0062] The housing assembly includes a first housing 1, a second housing 3, and a third housing 6 connected in sequence;

[0063] The first shell 1, the second shell 3, and the third shell 6 form a cavity;

[0064] The pressure chip 2 is installed inside the first housing 1. The inner wall of the first housing 1 is provided with an annular groove. The outer side of the pressure chip 2 is fixed with a ring body, which is installed in the annular groove, thereby realizing the pressure chip 2 is fixedly installed inside the first housing 1.

[0065] Meanwhile, sealant is filled between the inner wall of the first housing 1 and the outer side of the pressure chip 2 to achieve sealed installation of the pressure chip 2.

[0066] The second housing 3 has an air storage component 4 installed inside. The movable end of the air storage component 4 is connected to a moving block 5, and the bottom end of the moving block 5 is in contact with the end face of the pressure chip 2.

[0067] The main body of the first housing 1 is a base 101. The base 101 has an upper connecting end 102 and a lower connecting end 103 at its two ends. The lower connecting end 103 is connected to the pipe to be tested, thereby realizing the internal communication between the base 101 and the pipe to be tested.

[0068] Among them, the base 101 is a casting structure, the upper connecting end 102 of the base 101 has an outer diameter larger than the outer diameter of the lower connecting end 103 of the base 101, the detection end of the pressure chip 2 extends into the lower connecting end 103, and the liquid contacts the detection end of the pressure chip 2.

[0069] The main body of the second housing 3 is a cylindrical body 301. The cylindrical body 301 is connected to the upper connecting end 102 through an internal thread at one end, and an external thread at the other end of the cylindrical body 301.

[0070] Among them, cylinder 301 is a casting structure;

[0071] The other end of the cylinder 301 is fitted with a third housing 6, the end of the third housing 6 is provided with an internal thread, and the internal thread of the third housing 6 is engaged with the external thread at the other end of the cylinder 301.

[0072] This achieves a sealed connection between the base 101 and the cylinder 301, and a sealed connection between the cylinder 301 and the third housing 6. The third housing 6 is provided with a wire outlet hole.

[0073] Meanwhile, the third housing 6 and the cylinder 301 are sealed by a sealing ring 7, which seals the port of the third housing 6.

[0074] The cylinder 301 has a partition 302 inside. The partition 302 has a waist-shaped hole 3021 and a guide hole 3022 on its side. The gas storage component 4 is fixedly installed on the partition 302. The moving block 5 has columns 502 on both sides. The two columns 502 are located on both sides of the gas storage component 4. At the same time, the ends of the columns 502 slide along the guide hole 3022.

[0075] A screw hole is provided in the middle of the partition plate 302, and the bottom end of the gas storage component 4 is installed in the screw hole to fix the gas storage component 4. The outer diameter of the gas storage component 4 is smaller than the inner diameter of the cylinder 301, and the gas storage component 4 can expand and contract inside the cylinder 301.

[0076] The main body of the gas storage component 4 is an airbag 401. One end of the airbag 401 is provided with a lower mounting hole 4011, and a one-way valve 402 is installed in the lower mounting hole 4011.

[0077] The one-way valve 402 includes a valve seat 4021, a ball 4022 and a first spring 4023. The ball 4022 and the first spring 4023 are installed in the valve seat 4021, and the valve seat 4021 is fitted into the lower mounting hole 4011.

[0078] The bottom end of the valve seat 4021 is provided with an external thread, and the bottom end of the valve seat 4021 is installed in the threaded hole through the external thread. The top end of the valve seat 4021 is installed in the lower mounting hole 4011 through the external thread. The top end of the valve seat 4021 is bonded to the lower mounting hole 4011 with sealant. The lower mounting hole 4011 is provided with a stepped hole. One end of the first spring 4023 is limited through the stepped hole, and the other end of the first spring 4023 pushes the ball 4022 to close the air inlet of the valve seat 4021.

[0079] The other end of the airbag 401 is provided with an upper mounting hole 4012, and a drying component 403 is installed on the inner end of the lower mounting hole 4011. The drying component 403 includes an outer cylinder 4031 and an inner cylinder 4032.

[0080] An outer cylinder 4031 is installed on the outside of the inner cylinder 4032, and a cavity is formed between the outer cylinder 4031 and the inner cylinder 4032. The cavity is filled with a desiccant, which is one or more of silica gel desiccant, mineral desiccant and molecular sieve desiccant. A through groove is provided on the inner wall of both the outer cylinder 4031 and the inner wall of the inner cylinder 4032.

[0081] The end of the outer cylinder 4031 is located inside the upper mounting hole 4012.

[0082] The second spring 8 is installed inside the third housing 6. The second spring 8 is located above the moving block 5. The second spring 8 pushes the end of the column 502 of the moving block 5 to stick to the end of the base 101.

[0083] When different components are assembled, the end of the gas storage component 4 is first installed at the screw hole of the partition 302 to fix the gas storage component 4. At the same time, a moving block 5 is sleeved on the outside of the gas storage component 4, and the end of the column 502 of the moving block 5 is located in the guide hole 3022.

[0084] The second spring 8 is installed at the end of the moving block 5 and the third housing 6 is sleeved on it. After installation, the second spring 8 pushes the moving block 5 to compress the air bag 401, and the air inside the air bag 401 is discharged through the drying component 403.

[0085] Among them, the outer cylinder 4031 has multiple sets of through grooves located at the bottom end of the outer cylinder 4031. When the airbag 401 is fully compressed, part of the through grooves of the outer cylinder 4031 are connected to the cavity of the shell assembly.

[0086] Meanwhile, the data line of the pressure chip 2 passes through the guide hole 3022, the groove 501 and the outlet hole of the third housing 6 in sequence, and extends to the outside of the housing assembly through the outlet hole of the third housing 6. At the same time, a sleeve is installed inside the outlet hole of the third housing 6 and fitted onto the outside of the data line, thereby achieving the sealing of the outlet port of the third housing 6.

[0087] When the cylinder 301 is spliced ​​with the base 101, the upper connecting end 102 is installed in the port of the cylinder 301. At the same time, the end of the upper connecting end 102, which is screwed in, pushes the moving block 5 to compress the second spring 8. The moving moving block 5 drives the upper end of the gas storage component 4 to move, thereby realizing the expansion of the gas storage component 4.

[0088] During the expansion of the gas storage component 4, the air pressure inside the airbag 401 gradually decreases, causing the ball 4022 to compress the first spring 4023. The air inside the housing component enters the airbag 401 through the drying component 403, drawing the air from the first housing 1 and the second housing 3 into the interior of the gas storage component 4, thereby reducing the air inside the cavity of the housing component, effectively reducing the water vapor inside the housing component, and preventing water vapor from condensing and accumulating in the low-temperature environment, which could cause a short circuit in the electronic components.

[0089] At the same time, the air inside the housing assembly enters the air storage assembly 4 and is dried by the drying assembly 403.

[0090] After the air storage component 4 draws in air from inside the housing component, the inside of the housing component is in a low-pressure environment. The external air pressure pushes the mating threaded surfaces to stick together, thereby improving the sealing performance.

[0091] During disassembly, the first housing 1 and the second housing 3 are separated first. After the first housing 1 and the second housing 3 are separated, the second spring 8 pushes the moving block 5 to compress the air storage component 4 until the upper mounting hole 4012 of the airbag 401 slides to the bottom of the through groove of the outer cylinder 4031, so that the air inside the airbag 401 can be discharged.

[0092] The movable block 5 has a groove 501, which corresponds to the waist-shaped hole 3021 to facilitate the installation of the data cable.

[0093] A sealing ring 7 is fitted on the outer side of the base 101. Both ends of the sealing ring 7 are fitted on the outer side of the base 101. The middle part of the sealing ring 7 has an arched structure. The ports of the cylinder 301 are distributed correspondingly to the sealing ring 7.

[0094] A convex ring is formed between the middle of the sealing ring 7 and the outer wall of the base 101. After the cylinder 301 is fully installed, the port of the cylinder 301 is pressed against the outside of the convex ring, and the surface of the convex ring is in contact with the inside of the port of the cylinder 301, thereby achieving a seal and improving the sealing effect.

[0095] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A moisture-proof pressure sensor, comprising a housing assembly, characterized in that: The housing assembly includes a first housing (1), a second housing (3), and a third housing (6) connected in sequence. The first shell (1), the second shell (3), and the third shell (6) form a cavity; A pressure chip (2) is installed inside the first housing (1); The second housing (3) is equipped with a gas storage component (4), and the movable end of the gas storage component (4) is connected to a moving block (5). The bottom end of the moving block (5) is in contact with the end face of the pressure chip (2). The main body of the first housing (1) is a base (101), and the two ends of the base (101) are respectively provided with an upper connecting end (102) and a lower connecting end (103). The main body of the second housing (3) is a cylinder (301), and the cylinder (301) is connected to the upper connecting end (102) through an internal thread provided at one end. The other end of the cylinder (301) is fitted with a third housing (6). The cylinder (301) is provided with a partition (302) inside. The partition (302) has a waist-shaped hole (3021) and a guide hole (3022) on its side. The gas storage component (4) is fixedly installed on the partition (302). The moving block (5) has columns (502) on both sides. The two columns (502) are located on both sides of the gas storage component (4). At the same time, the ends of the columns (502) slide along the guide hole (3022). The main body of the gas storage component (4) is an airbag (401). One end of the airbag (401) is provided with a lower mounting hole (4011), and a one-way valve (402) is installed in the lower mounting hole (4011). The one-way valve (402) includes a valve seat (4021), a ball (4022) and a first spring (4023). The ball (4022) and the first spring (4023) are installed inside the valve seat (4021). The valve seat (4021) is fitted into the lower mounting hole (4011). The other end of the airbag (401) is provided with an upper mounting hole (4012), and a drying component (403) is installed on the inner end of the lower mounting hole (4011). The drying component (403) includes an outer cylinder (4031) and an inner cylinder (4032). The outer cylinder (4031) is installed on the outside of the inner cylinder (4032). A chamber is formed between the outer cylinder (4031) and the inner cylinder (4032). The chamber is filled with desiccant. A through groove is provided on the inner wall of the outer cylinder (4031) and the inner wall of the inner cylinder (4032). The end of the outer cylinder (4031) is located in the upper mounting hole (4012).

2. A moisture-proof pressure sensor according to claim 1, characterized in that: The third housing (6) is equipped with a second spring (8). The second spring (8) is located above the moving block (5), and the second spring (8) pushes the end of the column (502) of the moving block (5) to adhere to the end of the base (101).

3. A moisture-proof pressure sensor according to claim 1, characterized in that: The movable block (5) has a groove (501); The groove (501) is distributed correspondingly to the waist-shaped hole (3021).

4. A moisture-proof pressure sensor according to claim 1, characterized in that: A sealing ring (7) is fitted on the outside of the base (101), with both ends of the sealing ring (7) fitted on the outside of the base (101); The sealing ring (7) has an arched structure in the middle; The ports of the cylinder (301) are correspondingly distributed with the sealing rings (7).

5. A moisture-proof pressure sensor according to claim 1, characterized in that: The third housing (6) is provided with a wire outlet hole.

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