Gauge pressure sensor

Abstract

A gauge pressure sensor comprises a housing which comprises a main housing body and an upper cover which covers an upper end opening of the main housing body and forms a mounting cavity, and the upper cover extends downwards to form a vertical partition plate which divides the mounting cavity into a first cavity body and a second cavity body; a pressure introduction channel communicated to the mounting cavity is formed in the shell; the pressure measuring assembly is arranged in the mounting cavity; the pressure measuring element is arranged in the second cavity and is arranged on the substrate; the pressure measuring element is coupled to the pressure introduction channel; the dust cover is arranged on the upper cover, and the environment pressure is communicated to the second cavity through a ventilation gap between the dust cover and the upper cover and a ventilation hole formed in the upper cover in sequence; the vertical partition plate downwards abuts against the base plate, a first groove which is through up and down and extends left and right is formed in the vertical partition plate, the lower portion of the first groove is filled with first sealant, and the lower end of the vertical partition plate is bonded to the upper side surface of the base plate in a sealed mode through the first sealant. The gauge pressure sensor is good in isolation performance, and the production process is simpler.

Description

Technical Field

[0001] This application relates to the technical field of sensors, and particularly to a gauge pressure sensor. Background Art

[0002] For existing pressure sensors, when measuring the pressure of a pressure medium with a relatively high temperature, in addition to pressure-sensitive components such as a pressure chip, electronic components including a conditioning chip, terminals and terminal pads and their connecting leads need to be additionally protected. A common approach is to partition the installation cavity of the pressure sensor into at least two partition cavities. The pressure-sensitive components, especially those on the side of the high-temperature medium, are located in one partition cavity, and the other protected electronic components are arranged in another partition cavity. For example, a downward-facing partition can be formed on the upper cover, which can be adhesively sealed to the housing and a horizontal circuit board to form a partition. On the other hand, the upper cover and the main housing also need to be adhesively sealed by injecting sealant into a sealing groove formed on the main housing.

[0003] If sealant is injected into the partition of the circuit board and the sealing groove of the main housing before assembling the upper cover, and the sealant usually needs to be heated in a curing furnace to be completely cured, the sealant on the circuit board will flow and disperse to both sides. Therefore, it may be necessary to pre-bond two side baffles on the circuit board or form side baffles by repeatedly applying quick-drying glue to prevent the sealant from flowing and dispersing to both sides. This not only increases the process cost but also may result in a large amount of sealant used or insufficient thickness, causing the partition seal to fail. In addition, for a gauge pressure sensor, the gauge pressure sensor needs to be provided with a dust cover communicating with the environment, which has a small-sized air-permeable opening to introduce ambient pressure as a reference to the pressure-sensitive component. Liquids such as rainwater in the environment may adhere to the entrance of the air-permeable opening, which may cause the rainwater to enter the sensor interior through capillary action.

[0004] The information disclosed in the background section of the present invention is only used to enhance the understanding of the general background of the present invention and should not be regarded as an admission or any form of implication that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] In view of the deficiencies of the prior art, this application provides a gauge pressure sensor to solve at least one of the above defects.

[0006] To achieve the above object, this application provides the following technical solution: A gauge pressure sensor, which includes:

[0007] A housing, which includes a main housing and an upper cover covering the upper opening of the main housing and forming an installation cavity. The upper cover extends downward to form a vertical partition, and the vertical partition divides the installation cavity into a first cavity and a second cavity; a pressure introduction channel communicating with the installation cavity is formed on the housing;

[0008] A pressure measurement assembly disposed in the installation cavity, including a substrate blocking the inner end of the pressure introduction channel, at least one pressure measurement element disposed in the second cavity and on the substrate, and at least one electronic element disposed in the first cavity and on the substrate; the pressure measurement element is coupled to the pressure introduction channel; and a dust-proof cover disposed on the upper cover, and ambient pressure is sequentially communicated to the second cavity through the air-permeable gap between it and the upper cover and an air-permeable hole disposed on the upper cover; wherein, the vertical partition abuts downward against the substrate, a first groove extending vertically and horizontally is formed in the vertical partition, and the lower part of the first groove is filled with a first sealant, and the first sealant seals and bonds the lower end of the vertical partition to the upper side surface of the substrate.

[0009] Preferably, the air-permeable gap has an air-permeable port communicating with the environment formed between the dust-proof cover and the outer surface of the upper cover, one side wall of the first groove extends obliquely upward away from its other side wall to form a first slope surface, and the upper end of the first slope surface extends to directly below the air-permeable port.

[0010] Preferably, the first slope surface occupies most or all of the left-right width of the first groove.

[0011] Preferably, the side wall of the vertical partition facing the second cavity integrally extends to the inner side wall of the upper cover through two oppositely arranged wall parts, and the two wall parts and the first slope surface enclose a groove with the first slope surface as the bottom wall.

[0012] Preferably, the other side wall of the first groove extends obliquely upward away from the first slope surface to form a second slope surface.

[0013] Preferably, at least one end of the left and right of the outer surface sinks relatively to form an overflow groove, and the left and right corresponding ends of the upper end of the first groove penetrate through the overflow groove to the left and right corresponding side walls of the upper cover.

[0014] Preferably, a sealing groove is formed on the main housing, and a sealing flange corresponding to and extending downward around the periphery of the upper cover extends into the sealing groove, and the sealing flange is adhesively sealed to the upper opening of the main housing by a second sealant filled in the sealing groove.

[0015] Preferably, the left and right ends of the vertical partition extend integrally towards the left and right outer sides respectively to the sealing flange.

[0016] Preferably, one side of the dust cover away from the vertical partition abuts downward against the outer surface of the upper cover.

[0017] Preferably, at least one of the inner and outer ends of the vent hole is covered with a breathable film.

[0018] The differential pressure sensor of the present invention can inject sealant into the groove formed in the vertical partition of the upper cover after the upper cover is assembled to the main housing, and inject sealant into the sealing groove. These two sealant injection operations can be performed simultaneously and can be heated and cured simultaneously subsequently, saving production time and process costs; in addition, the liquid attached to the vent can slide into the groove for temporary storage through the inclined plane, preventing the liquid from entering the sensor interior through the vent gap. Description of the Drawings

[0019] Figure 1 Is a top view of the differential pressure sensor of the first embodiment;

[0020] Figure 2 Is the differential pressure sensor of the first embodiment along Figure 1 The cross-sectional view taken along A-A shown;

[0021] Figure 3 Is a partial structure three-dimensional view of the differential pressure sensor of the first embodiment;

[0022] Figure 4 Is a three-dimensional view of the upper cover of the first embodiment;

[0023] Figure 5 Is a partial structure three-dimensional view of the differential pressure sensor of the second embodiment;

[0024] Figure 6 Is the partial structure of the differential pressure sensor of the third embodiment along Figure 1 The cross-sectional view taken along A-A shown; Detailed Embodiments

[0025] The technical solutions of the present application will be clearly and completely described below with reference to the drawings. The following embodiments are exemplary and are only used to explain the present application, and should not be construed as a limitation of the present application. In the following description, the same reference numerals are used to represent the same or equivalent elements, and repeated descriptions are omitted.

[0026] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. In addition, the prefixes "first", "second", "third", etc. are only used for the purpose of distinguishing the objects to be modified, and should not be construed as indicating or implying relative importance.

[0027] In addition, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0028] It should be further understood that the term "and / or" used in the specification and corresponding claims of the present application refers to any combination of one or more of the listed items and all possible combinations.

[0029] As Figures 1 to 3 shown. The gauge pressure sensor 100 of the embodiment includes a housing 1 and a pressure measurement assembly 2 disposed in an installation cavity formed within the housing 1. Among them, the housing 1 may include a main housing 11 and an upper cover 12 covering the upper opening of the main housing 11 and forming an installation cavity. The upper cover 12 extends downward to form a vertical partition 123. The vertical partition 123 divides the installation cavity into a cavity 1a and a cavity 1b. A pressure introduction channel 1110 communicating with the installation cavity is formed on the housing 1. The pressure introduction channel 1110 may be defined by the inner wall of a pressure interface 111 formed on the main housing 11.

[0030] The pressure measurement assembly 2 may include a substrate 20 disposed in the installation cavity, at least one pressure measurement element 200, and at least one electronic component. Among them, the substrate 20 seals the inner end of the pressure introduction channel 1110. The pressure measurement element 200 and the electronic component are disposed on the substrate 20, and the pressure measurement element 200 is coupled to the pressure introduction channel 1110, as Figure 2As shown, the lower side of the substrate 20 can be adhesively sealed to the inner end of the pressure introduction channel 1110, and a processing circuit 21 can be provided on the upper side surface of the substrate 20. Both the pressure measurement element 200 and the electronic components can be provided on the upper side surface of the substrate 20. The pressure measurement element 200 can be coupled to the pressure introduction channel 1110 through a pressure through-hole 201 penetrating the substrate 20 up and down. In some other solutions, the pressure measurement element 200 can also be provided on the lower side surface of the substrate 20. In this case, the pressure hole can be omitted, and the pressure measurement element 200 can be electrically connected to the processing circuit 21 on the upper side through a metallized via provided on the substrate 20.

[0031] Among them, the vertical partition 123 abuts downward against the substrate 20. A groove 123a penetrating up and down and extending left and right is formed in the vertical partition 123. The groove 123a is filled with a sealant 62. The sealant 62 adhesively seals the lower end of the vertical partition 123 to the upper side surface of the substrate 20.

[0032] Merely by way of example, the electronic components can include at least one of a conditioning element 202, a plurality of pads 204, and a capacitor 203. Among them, the pad 204 is electrically connected to the inner end of the terminal 206 through a lead 205, and the outer end of the terminal 206 can penetrate outward through the main housing 11 and extend into an electrical plug portion 112 formed on the main housing 11. In this way, the connections of the lead 205 with the pad 204 and the terminal 206, as well as the conditioning element 202, can be reliably protected.

[0033] Among them, the conditioning element 202 can be surrounded by a frame 202a fixed on the surface of the substrate 20, and the frame 202a can be filled with a protective gel. The pressure measurement element 200 can be surrounded by a frame 200a fixed on the surface of the substrate 20, and the frame 200a can also be filled with a protective gel.

[0034] Merely by way of example, a sealing groove 11a is formed on the main housing 11. The upper cover 12 can include a main body portion 121 extending substantially horizontally. A sealing flange 122 corresponding to and extending downward from the periphery of the main body portion 121 extends into the sealing groove 11a. The sealing flange 122 is adhesively sealed to the upper end opening of the main housing 11 through the sealant 61 filled in the sealing groove 11a.

[0035] Preferably, a ventilation hole 120 is provided on the upper cover 12. The ventilation hole 120 can be provided on a columnar portion 124 formed by the upper cover 12 protruding upward and penetrate the columnar portion 124 inside and outside. A dust-proof cover 3 is sleeved outside the columnar portion 124, and a ventilation gap 31 is left between the dust-proof cover 3 and the upper cover 12. The ambient pressure is sequentially communicated to the cavity 1b through the ventilation gap 31 and a ventilation hole 120 provided on the upper cover 12, so that the pressure measuring element 200 can obtain the ambient pressure from the environment and use it as a reference pressure. Merely exemplarily, the dust-proof cover 3 can include a plate portion 32 extending substantially horizontally and a flange portion 33 formed by the peripheral edge of the plate portion 32 extending downward. A lateral gap 31b is left between the plate portion 32 and the top surface of the columnar portion 124. At least one longitudinal groove 31a can be provided on the outer peripheral wall of the columnar portion 124. The upper end of the longitudinal groove 31a communicates with the lateral gap 31b, and the lower end can communicate with the environment through a ventilation port 31c. Among them, a ventilation film 4 covering the outer end of the ventilation hole 120 can be provided on the top surface of the columnar portion 124. Alternatively or additionally, another ventilation film covering the inner end of the ventilation hole 120 can be provided on the inner side wall 12a of the upper cover 12.

[0036] In the differential pressure sensor 100 of this embodiment, since a vertically penetrating groove 123a is provided in the vertical partition 123, the upper cover 12 can be assembled to the main housing 11 first, and then sealant 62 is injected into the groove 123a and sealant 61 is injected into the seal groove 11a, and then the sealant 61 and the sealant 62 are cured together. Among them, the materials of the sealant 61 and the sealant 62 can be the same, or can be completed simultaneously in one injection operation. Thereby, the cost can be reduced, and at the same time, the flow of the sealant 62 to both sides can be avoided, saving the amount of the sealant 62. On the premise of the same amount of glue, it can be ensured that the sealant 62 forms a larger thickness between the vertical partition 123 and the substrate 20, thereby improving the sealing performance of the partition.

[0037] Among them, in order to prevent the sealant 62 injected into the groove 123a from forming gaps on the left and right sides, the left and right ends of the vertical partition 123 can respectively extend integrally to the left and right outer sides to the sealing flanges 122. In order to further position the vertical partition 123 and / or prevent the sealant 61 in the seal groove 11a from flowing out of the groove 123a too much, two grooves 113a extending left and right and opposite to each other can be formed on the main housing 11, and the left and right ends of the vertical partition 123 are correspondingly received in the two grooves 113a. The left and right outer ends of the groove 123a can communicate with the seal groove 11a respectively. The left and right ends of the top of the groove 123a are flush with or partially exceed the left and right inner edges of the groove 113a toward the left and right outer sides. The groove 113a can be formed by two retaining walls 113 formed on the main housing 11, and the retaining walls 113 can be integrally connected to the inner part of the seal groove 11a.

[0038] Preferably, one end of the air-permeable gap 31 facing the environment communicates with the environment through the air-permeable port 31c. One side wall of the groove 123a extends obliquely upward away from its other side wall to form a slope surface 123d, and the upper end of the slope surface 123d extends to directly below the air-permeable port 31c. This can enable the liquid that may adhere to the air-permeable port 31c to flow into the groove 123a, so as to prevent the liquid adhering to the air-permeable port from being introduced into the sensor interior.

[0039] Preferably, as Figure 4 shown, one side wall of the vertical partition 123 facing the cavity 1b integrally extends to the inner side wall 12a of the upper cover 12 through two oppositely arranged wall portions 123g on the left and right. The two wall portions 123g and the slope surface 123d enclose a groove, and the slope surface 123d serves as the bottom wall of the groove.

[0040] Please refer to Figure 5 , in the second embodiment, preferably, the slope surface 123d can occupy most or all of the left-right width of the groove 123a, which is convenient for injecting the sealant 61 into the groove 123a. For example, one end 1231 of the groove 123a can be close to the outer wall on one side of the left and right of the upper cover 12, and the other end 1232 of the groove 123a can penetrate through to the outer wall on the other side of the left and right of the upper cover 12, as Figure 1 shown. At least one end of the left and right of the outer surface 12b can be relatively sunken to form an overflow groove 123f, and the corresponding left and right ends of the upper end of the groove 123a penetrate through the overflow groove 123f to the side wall on the corresponding left and right sides of the upper cover 12. Preferably, one side 3111 of the dust-proof cover 3 far from the vertical partition 123 abuts downward against the outer surface 12b of the upper cover 12, so that only the air-permeable port 31c is left on the side of the flange portion 33 close to the groove 123a.

[0041] Preferably, the bottom of the groove 113a is substantially flush with the upper side surface of the substrate 20, so that the lower end of the vertical partition 123 abuts against the upper side surface of the substrate 20 and the bottom of the groove 113a substantially simultaneously. Among them, the bottom opening of the groove 123a expands towards the front and rear sides to form a flared opening 123b, which can increase the contact area between the sealant 62 and the upper side surface of the substrate 20 to improve the bonding effect. Among them, reinforcing ribs 124 can be formed on the lower side surface of the main body portion 121, and the reinforcing ribs 124 can integrally extend to the outer wall of the vertical partition 123 and the inner wall of the sealing flange 122.

[0042] As Figure 6 shown, on the basis of the first embodiment, the other side wall of the groove 12 as can also extend obliquely upward away from the slope surface 123d to form a slope surface 123e.

[0043] The scope of the present disclosure is not limited by the detailed description, but rather by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are construed as being included in the present disclosure.

Claims

1. A gauge pressure sensor (100), characterized in that, Comprising: A housing (1), which includes a main housing body (11) and an upper cover (12) covering the upper opening of the main housing body (11) and forming an installation cavity. The upper cover (12) extends downward to form a vertical partition plate (123), and the vertical partition plate (123) partitions the installation cavity into a first cavity (1a) and a second cavity (1b); A pressure introduction channel (1110) communicating with the installation cavity is formed on the housing (1); A pressure measurement assembly (2) disposed in the installation cavity, including a substrate (20) blocking the inner end of the pressure introduction channel (1110), at least one pressure measurement element (200) disposed in the second cavity (1b) and on the substrate (20), and at least one electronic component disposed in the first cavity (1a) and on the substrate (20); The pressure measurement element (200) is coupled to the pressure introduction channel (1110); And a dust-proof cover (3) disposed on the upper cover (12), and ambient pressure is sequentially communicated to the second cavity (1b) through a ventilation gap (31) between it and the upper cover (12) and a ventilation hole (120) disposed on the upper cover (12); Wherein, the vertical partition plate (123) abuts downward against the substrate (20), a first groove (123a) that penetrates up and down and extends left and right is formed in the vertical partition plate (123), and the lower part of the first groove (123a) is filled with a first sealant (62), and the first sealant (62) seals and bonds the lower end of the vertical partition plate (123) to the upper side surface of the substrate (20).

2. The differential pressure sensor (100) according to claim 1, characterized in that, The ventilation gap (31) has a ventilation port (31c) communicating with the environment formed between the dust-proof cover (3) and the outer side surface (12b) of the upper cover (12). One side side wall of the first groove (123a) extends obliquely upward away from the other side side wall to form a first slope surface (123d), and the upper end of the first slope surface (123d) extends to directly below the ventilation port (31c).

3. The differential pressure sensor (100) according to claim 2, characterized in that, The first slope surface (123d) occupies most or all of the left-right width of the first groove (123a).

4. The manometer sensor (100) according to claim 2, characterized in that, One side side wall of the vertical partition plate (123) facing the second cavity (1b) integrally extends to the inner side wall (12a) of the upper cover (12) through two opposed wall portions (123g), and the two wall portions (123g) and the first slope surface (123d) enclose a groove with the first slope surface (123d) as the bottom wall.

5. The manometer sensor (100) according to claim 2, characterized in that, The other side side wall of the first groove (123a) extends obliquely upward away from the first slope surface (123d) to form a second slope surface (123e).

6. The differential pressure sensor (100) according to claim 2, characterized in that, At least one end of the left and right of the outer side surface (12b) sinks relatively to form an overflow groove (123f), and the left and right corresponding ends of the upper end of the first groove (123a) penetrate through the overflow groove (123f) to the side wall corresponding to the left and right of the upper cover (12).

7. The differential pressure sensor (100) according to claim 1, characterized in that, A sealing groove (11a) is formed in a circle on the main housing (11), and a sealing flange (122) that correspondingly extends downward in a circle and extends into the sealing groove (11a) is formed at the periphery of the upper cover (12). The sealing flange (122) is adhesively sealed to the upper opening of the main housing (11) through a second sealant (61) filled in the sealing groove (11a).

8. The differential pressure sensor (100) according to claim 7, characterized in that, The left and right ends of the vertical partition (123) integrally extend outward to the left and right respectively to the sealing flange (122).

9. The manometer sensor (100) according to claim 2, characterized in that, One side (3111) of the dust cover (3) far from the vertical partition (123) abuts downward against the outer surface (12b) of the upper cover (12).

10. The pressure sensor (100) according to any one of claims 1 to 9, characterized in that, At least one of the inner and outer ends of the vent hole (120) is covered with a breathable film (4).

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