Pressure measuring assembly and pressure sensor

Abstract

A pressure measurement assembly convenient to assemble and a pressure sensor, the pressure measurement assembly comprising: a seat cover comprising a first cover portion and a circle of thin wall portion formed by extending the first cover portion towards a longitudinal far end side; the electronic module assembly comprises a substrate extending transversely and a processing circuit arranged on one side of the longitudinal near end of the substrate; the outer periphery of the substrate is clamped on the inner side of the thin wall part, and an accommodating cavity for accommodating a processing circuit is defined between the substrate and the seat cover; the pressure sensitive element is fixed on the surface of one side of the substrate and is electrically connected to the processing circuit; and the first sealing piece is arranged in the accommodating cavity and extends along the root part of the inner side wall of the thin-wall part. Preferably, the electric connection assembly correspondingly penetrates through the first cover part, and one end of the inner side of the electric connection assembly is electrically connected to the processing circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure sensor, in particular to a pressure measurement assembly and a pressure sensor. BACKGROUND

[0002] In the pressure sensor, the inside of the introduction channel of the pressure medium to be measured is usually sealed by using a sealing ring to avoid leakage of the pressure medium to be measured into the pressure sensor. In order to provide the above-mentioned compression force, the shell is usually set as a metal cylinder, and the upper end of the metal cylinder is formed by extrusion to form a compression edge, so as to be sequentially contacted with the end button and the sealing ring. The gap between the compression edge and the end button also needs to be sealed by another sealing ring. Since these sealing rings are located inside the cylinder shell, and the cylinder shell has a large diameter, the sealing ring is not convenient to install and may not be installed in place when the sealing ring is placed.

[0003] The information disclosed in the background section of the present application is only used to enhance the understanding of the general background of the present application, and should not be regarded as acknowledging or implying in any form that the information constitutes prior art known to those skilled in the art. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application aims to provide a pressure measurement assembly to solve at least one of the above-mentioned defects.

[0005] The present application provides a pressure measurement assembly, which comprises:

[0006] A seat cover comprising a first cover portion and a thin-walled portion extending from the first cover portion to the side of the longitudinal distal end;

[0007] An electronic module assembly comprising a transversely extending substrate and a processing circuit arranged on the side of the longitudinal proximal end of the substrate; the outer periphery of the substrate is clamped on the inside of the thin-walled portion and forms a receiving cavity with the seat cover to accommodate the processing circuit;

[0008] A pressure-sensitive element fixed to one side surface of the substrate and electrically connected to the processing circuit;

[0009] And a first sealing member arranged in the receiving cavity, which extends along the root of the inner side wall of the thin-walled portion.

[0010] Preferably, it further comprises an electrical connection assembly corresponding to the first cover portion, and one end of the electrical connection assembly is electrically connected to the processing circuit.

[0011] Preferably, the electrical connection assembly comprises a plurality of conductive spiral springs corresponding to a plurality of through holes arranged on the first cover portion; the middle part of the conductive spiral spring is held in the through hole, and the inner side end is vertically and elastically electrically connected to the processing circuit.

[0012] Preferably, the pressure measurement assembly further comprises an electromagnetic shielding element made of a conductor material fixed on the outer surface of the first cover portion, the electromagnetic shielding element is plate-shaped and has a plurality of holes allowing the conductive coil spring to pass through; at least one of the conductive coil spring is electrically connected to the ground terminal of the processing circuit for grounding and electrically connected to the electromagnetic shielding element.

[0013] Preferably, the edge of the hole corresponding to the conductive coil spring grounded is integrally extended into the corresponding via hole to form a cylindrical lining portion lined on the inner wall of the via hole; the middle part of the conductive coil spring grounded is electrically contacted to the cylindrical lining portion on the longitudinally distal side.

[0014] Preferably, the middle part of the conductive coil spring comprises a first transition part with a gradually decreasing outer diameter longitudinally distal end, and the first transition part is electrically contacted to the corresponding tapered inner wall formed on the cylindrical lining portion on the longitudinally distal end.

[0015] Preferably, the conductive coil spring comprises a plug-in part formed on the upper part.

[0016] Preferably, the pressure measurement assembly further comprises a second sealing element sleeved on the outer wall of the thin-walled portion.

[0017] The present application also claims a pressure sensor comprising:

[0018] The pressure measurement assembly according to any one of claims 1-12;

[0019] The housing enclosing the installation cavity comprises a terminal knob and a main shell having an inner side one end communicated to the pressure introduction channel of the installation cavity, the main shell in turn compresses and seals the first sealing element to the outer edge of the longitudinal proximal end of the base plate through the terminal knob and the seat cover, and the edge of the longitudinal distal end of the base plate is supported on the inner side one end of the pressure introduction channel.

[0020] Preferably, the main shell further compresses and seals the second sealing element to the periphery of the inner side one end of the pressure introduction channel through the terminal knob and the seat cover. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Structure diagram of the pressure sensor of the first embodiment.

[0022] Figure 2 Structure diagram of the pressure measurement assembly of the first embodiment. DETAILED DESCRIPTION

[0023] The technical solutions of the present application will be clearly and completely described below with reference to the drawings. The following examples are exemplary and are used to explain the present application, but cannot be interpreted as a limitation on the present application. In the following description, the same reference signs are used to represent the same or equivalent elements, and repeated description is omitted.

[0024] In the description of the present application, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc. indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the prepositions "first", "second", "third", etc. are only used for the purpose of distinguishing the objects being modified, and cannot be understood as indicating or implying relative importance.

[0025] In addition, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] It should be further understood that the term "and / or" used in the present application specification and corresponding claims means any combination of one or more of the listed items and all possible combinations.

[0027] As Figure 1 shown. Figure 1 A pressure sensor 100 is shown, which includes a housing 200 enclosing a mounting cavity (not labeled), for example, the housing 200 can include a lower main housing 1 and an upper end knob 2, and the housing 200 can be defined mainly by a recess (not labeled) formed at the upper end of the main housing 1. A pressure introduction channel 10 is provided in the main housing 1, which can be arranged in the up-down direction. The inner side of the pressure introduction channel 10 is connected to the mounting cavity upward to introduce the pressure medium to be measured. The pressure sensor 100 further includes a pressure measuring assembly 300 arranged in the mounting cavity. The pressure measuring assembly 300 is fixedly closed to the inner side of the pressure introduction channel 10, which can include a pressure sensitive element 39 for receiving the pressure of the pressure medium to be measured, and a processing circuit 32 for converting the pressure of the pressure medium to be measured into a corresponding electrical signal, and can be further processed.

[0028] The main housing 1 is made of metal and has a cylindrical shell 11 extending upwardly around the periphery of the end knob 2. The upper end of the cylindrical shell 11 is bent inwardly to form a pressing portion 111. The pressing portion 111 can form a complete ring in the circumferential direction or can not form a complete ring. The pressing portion 111 applies a pressing force downwardly on the end knob 2 to press the end knob 2 downwardly. For example, the end knob 2 can include a cover portion 21 and a flange 22 extending downwardly from the outer periphery of the cover portion 21. The pressing portion 111 can be pressed downwardly on an upwardly facing step surface 2a formed on the flange 22 to form a certain pressing force on the end knob 2. The end knob 2 presses the pressure measuring assembly 300 downwardly to the inner end of the pressure introduction channel 10.

[0029] As shown in Figure 2 , the pressure measuring assembly 300 can be assembled integrally before being mounted to the housing 200. The assembled pressure measuring assembly 300 can include the seat cover 4 and the electronic module assembly 3 in addition to the pressure sensitive element 39 described above. The seat cover 4 can include a cover portion 41 extending generally transversely (i.e., in the left-right direction in Figure 1 , Figure 2 , and a thin wall portion 43 extending from the cover portion 41 to the longitudinally distal side (i.e., the lower end in Figure 1 , Figure 2 ). The electronic module assembly 3 can include a substrate 31 extending transversely, and a processing circuit 32 provided on the longitudinally proximal side (i.e., the upper end in Figure 1 , Figure 2 ) of the substrate 31. The outer periphery of the substrate 31 is clamped to the inner side of the thin wall portion 43 in advance, and forms a receiving cavity 30 with the seat cover 4 to receive the processing circuit. The substrate 31 can have a pressure through hole 31a penetrating the surfaces of the two longitudinal ends. The pressure sensitive element 39 can be fixed to the longitudinally proximal end of the pressure through hole 31a by adhesion or soldering, and can be electrically connected to the processing circuit 32 by a lead 35.

[0030] The processing circuit 32 can be at least partially insulated and printed on the upper surface of the substrate 31, or can be fixed to the upper surface of the substrate 31 in the form of a separate circuit board. The processing circuit 32 can have a frame 33 surrounding the periphery of the pressure sensitive element 39 and the lead 35. The frame 33 can be filled with a protective gel 34 covering the pressure sensitive element 39 and the lead 35. The processing circuit 32 can include at least one conditioning element 36.

[0031] Although the electric signal processed by the processing circuit 32 can be transmitted to the outside of the pressure sensor 100 by wireless means, the pressure measuring assembly 300 preferably further comprises an electric connecting assembly corresponding to the through holes 41a formed in the cover 41, the inner end of the electric connecting assembly being electrically connected to the processing circuit 32. Preferably, the electric connecting assembly comprises a plurality of electrically conductive coil springs 6 corresponding to the through holes 41a formed in the cover 41, the middle part of the electrically conductive coil springs 6 being held in the through holes 41a, and the inner end being vertically and elastically electrically connected to the processing circuit 32.

[0032] The pressure measuring assembly 300 further comprises a sealing member 8 arranged in the accommodating cavity 30 and extending along the inner wall of the thin wall portion 43. During installation, the pressure measuring assembly 300 is first arranged in the recess of the main housing 1, and then the end knob 2 is arranged on the upper side of the pressure measuring assembly 300, and the plurality of electrically conductive coil springs 6 are correspondingly arranged through the plurality of holding holes 21a formed in the cover 41, and then the pressing portion 111 is formed by pressing one end of the barrel 11. In this way, the pressing portion 111 is sequentially pressed downward on the stepped surface 2a of the end knob 2, and the flange 22 is pressed downward on the upward stepped surface 4b formed on the outer peripheral portion 42 of the seat cover 4. The outer peripheral portion 42 forms a pressing surface 42a at the inner root of the thin wall portion 43, and the sealing member 8 is pressed downward on the outer edge of the proximal end of the base plate 31, and the distal end of the base plate 31 is supported on the outer periphery of the inner end of the pressure introduction channel 10. Preferably, the pressing portion 111 forms a complete circle in the circumferential direction, so that a certain sealing is formed between the flange 22 and the pressing portion 111.

[0033] In this way, the pressure measuring assembly 300 is sealingly fixed to the inner end of the pressure introduction channel 10. In this way, the sealing member 8 and the base plate 31 can be assembled to the inner side of the thin wall portion 43 before the assembled pressure measuring assembly 300 is arranged, so that the sealing member 8 can be conveniently installed. Preferably, circumferential positioning structures can be arranged between the base plate 31 and the thin wall portion 43.

[0034] Preferably, the pressure measuring assembly 300 further comprises a sealing member 7 arranged on the outer side of the thin wall portion 43, the sealing member 7 being sleeved on the outer wall of the thin wall portion 43, and the outer peripheral portion 42 forms a pressing surface 42b at the outer root of the thin wall portion 43, for pressing the sealing member 7 downward on the outer periphery of the inner end of the pressure introduction channel 10, for example, on the upward supporting surface 1a formed at the inner root of the barrel 11, so as to form a more reliable sealing between the outer side of the thin wall portion 43 and the barrel 11. The upper end of the outer peripheral portion 42 has an upward stepped surface 4a, and the end knob 2 can be pressed downward on at least one of the stepped surface 4a and the stepped surface 4b.

[0035] The pressure measuring assembly 300 can further comprise an electromagnetic shielding element 5. The electromagnetic shielding element 5 can be fixed on the outer surface of the cover portion 41 and made of a conductive material. The electromagnetic shielding element 5 is plate-shaped and can be provided with a plurality of holes 5a allowing the corresponding conductive coil springs 6 to pass through. At least one conductive coil spring 6 is electrically connected to the ground terminal of the processing circuit for grounding and electrically connected to the electromagnetic shielding element 5. Preferably, the edge of the hole 5a corresponding to the conductive coil spring 6 connected to the ground integrally extends into the corresponding via hole 41a to form a cylindrical lining portion 51 lining the inner wall of the via hole 41a. The middle part of the conductive coil spring 6 connected to the ground electrically contacts the cylindrical lining portion 51 on the longitudinally distal side.

[0036] Preferably, the conductive coil spring 6 can comprise an upper connector portion 63 and a lower elastic portion 61. The connector portion 63 can have a certain rigidity due to at least partial tight winding, so as to be mechanically connected to the external arrangement; the elastic portion 61 can have a certain elasticity due to at least partial sparse winding, so as to enable the lower end of the conductive coil spring 6 to form an elastic electrical contact with the processing circuit 32. Specifically, the elastic portion 61 can comprise a portion 611 with a larger outer diameter and a portion 612 with a smaller outer diameter, and the portion 612 is at least partially sparse winding. The transition portion 613 between the portion 611 and the portion 612 has a gradually decreasing outer diameter from top to bottom, for example, the outer envelope of the transition portion 613 is conical. The transition portion 613 of the conductive coil spring 6 connected to the ground contacts the cylindrical lining portion 51 lining the inner wall of the via hole 41a on the longitudinally distal side, and the transition portion 613 of the other conductive coil spring 6 supports on the via hole 41a with a gradually decreasing hole diameter from top to bottom (corresponding to the formation of a conical surface) downward. In order to enable the end button 2 to compress the conductive coil spring 6 downward, a transition portion 62 with an increasing outer diameter from top to bottom is provided between the connector portion 63 and the elastic portion 61, and the retaining hole 21a can be correspondingly a stepped hole with a smaller upper outer diameter and a larger lower outer diameter. The inner wall of the retaining hole 21a is pressed tightly on the transition portion 62 downward.

[0037] The scope of the disclosure is not limited by the detailed description, but is defined by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are interpreted as being included in the disclosure.

Claims

1. A pressure measuring assembly (300), characterized by, include: The seat cover (4) includes a first cover portion (41) and a ring of thin-walled portion (43) extending from the first cover portion (41) toward the longitudinal distal end; The electronic module assembly (3) includes a laterally extending substrate (31) and a processing circuit (32) disposed on the longitudinal proximal side of the substrate (31); the outer periphery of the substrate (31) is engaged with the inner side of the thin-walled portion (43) and forms a receiving cavity (30) for accommodating the processing circuit (32) between the substrate (31) and the seat cover (4). A pressure-sensitive element (39) is fixed to one side surface of the substrate (31) and electrically connected to the processing circuit (32); and a first sealing member (8) disposed in the receiving cavity (30), which extends along the root of the inner sidewall of the thin-walled portion (43).

2. The pressure measuring assembly (300) according to claim 1, characterized in that It also includes an electrical connection component that passes through the first cover (41), one end of which is electrically connected to the processing circuit (32).

3. The pressure measuring assembly (300) according to claim 2, characterized in that The electrical connection assembly includes several conductive helical springs (6) correspondingly passing through several through holes (41a) provided on the first cover (41); the middle part of the conductive helical spring (6) is held in the through hole (41a), and one end of the inner side is vertically and elastically electrically contacted to the processing circuit (32).

4. The pressure measuring assembly (300) according to claim 3, characterized in that It also includes an electromagnetic shielding element (5) made of conductive material fixed to the outer surface of the first cover (41), the electromagnetic shielding element (5) being plate-shaped and having several holes (5a) thereon that allow the conductive helical spring (6) to pass through; at least one of the conductive helical springs (6) is electrically connected to the grounding terminal of the processing circuit to ground, and is also electrically connected to the electromagnetic shielding element (5).

5. The pressure measuring assembly (300) according to claim 4, characterized in that The edge of the hole (5a) corresponding to the grounded conductive helical spring (6) extends integrally into the corresponding through hole (41a) to form a cylindrical inner liner (51) that is lined to the inner wall of the through hole (41a); the middle part of the grounded conductive helical spring (6) contacts the cylindrical inner liner (51) on the longitudinally distal side.

6. The pressure measuring assembly (300) according to claim 5, characterized in that The conductive helical spring (6) includes a first transition portion (613) in the middle, which gradually decreases in the outer radial direction at the distal end. The first transition portion (613) makes electrical contact with the corresponding conical inner wall formed on the cylindrical inner liner (51) at the distal end in the longitudinal direction.

7. The pressure measuring assembly (300) according to claim 3, characterized in that The conductive helical spring (6) includes an upper-formed connector (63).

8. The pressure measuring assembly (300) according to any one of claims 1 to 7, characterized in that, It also includes a second sealing element (7) fitted onto the outer wall of the thin-walled portion (43).

9. A pressure sensor (100), characterized by include: The pressure measuring assembly (300) according to any one of claims 1 to 7; The outer shell (200) forming the mounting cavity includes an end button (2) and a main housing (1) having an inner end connected to the mounting cavity. The main housing (1) sequentially presses and seals the first seal (8) to the outer edge of the longitudinal proximal end of the substrate (31) via the end button (2) and the seat cover (4). The edge of the longitudinal distal end of the substrate (31) is supported on the inner end of the pressure introduction channel (10).

10. A pressure sensor (100), characterized by include: The pressure measurement assembly (300) according to claim 8; The shell (200) surrounding the installation cavity, comprising an end knob (2) and a main shell (1) with an inner side end communicating to the pressure introduction channel (10) of the installation cavity, the main shell (1) sequentially compresses and seals the first sealing piece (8) to the outer edge of the longitudinal proximal end of the base plate (31) through the end knob (2) and the seat cover (4), and the edge of the longitudinal distal end of the base plate (31) is supported on the inner side end of the pressure introduction channel (10); the main shell (1) also sequentially compresses and seals the second sealing piece (7) to the outer periphery of the inner side end of the pressure introduction channel (10) through the end knob (2) and the seat cover (4).

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