JP2017067644A - Pressure detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure detecting device that can help reduce the number of component items, simplify the manufacturing process and enhance reliability.SOLUTION: A pressure detecting device 1 is equipped with a pressure port 10 through which fluid is let in, a pressure sensor 20 arranged in the pressure receiving part 15 of the pressure port 10, a terminal board 30 having a relay terminal 33 connected to the terminal part 21 of the pressure sensor 20 and a connector part 40 that has a connector terminal 41 connected to the relay terminal 33 to externally output signals of the pressure sensor 20. The terminal board 30 has a concave part 32 that accepts the insertion end part 41a of the connector terminal 41. The relay terminal 33 has an accepting connection part 33a, arranged in the concave part 32 of the terminal board 30, accepts the insertion end part 41a of the connector terminal 41 to be connected to the connector terminal 41.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pressure detection device that detects the pressure of a fluid.

  Medium- and high-pressure sensors are used for environmental protection and fuel efficiency improvement of automobiles. The medium / high pressure sensor measures, for example, engine oil pressure, variable valve oil pressure, power steering pressure, in-cylinder injection (DI) pressure, brake oil pressure, or pressure of the working fluid in the suspension, transmission, and air conditioner. The medium-high pressure sensor is a pressure detection device that is attached to various devices to be measured and measures medium-high pressure, for example, about several MPa to several hundred MPa.

  As an example of such a pressure detection device, the end face has a diaphragm that is displaced by receiving pressure from the pressure introduction port, and the surface of the diaphragm has a strain gauge that detects distortion of the diaphragm. A pressure sensor having a pressure receiving side connection port is known. The pressure sensor further includes an intermediate body, a signal side connection port body, a printed circuit board, a first connection portion, and a second connection portion (see claim 1 of Patent Document 1 below). ).

  Another example of a pressure sensing device is a closed pedestal end with a septum, an elongate coupling for attaching the transducer to the fluid pressure source to be monitored, and an intermediate between the pedestal end and coupling. Pressure transducers are known that include a generally tubular port fitting having a support flange extending radially outward from the port fitting. The pressure transducer further includes a circuit board, a cover member, and a housing member (see claim 1 of Patent Document 2 below).

JP-A-8-21775 JP-A-2004-205514

  As described above, the pressure detection device is attached to the device to be measured. For example, the pressure detection device measures the pressure of a medium to high pressure fluid of several MPa to several hundred MPa. I can't. For this reason, the pressure detection device is required to have high reliability capable of accurately measuring the pressure of the fluid over a long period of time.

  As means for improving the reliability of the pressure detection device, it is effective to reduce the number of parts and to simplify the manufacturing process. However, for example, the conventional pressure detection devices as described in Patent Documents 1 and 2 have a large number of parts and a complicated manufacturing process, so that it is difficult to improve reliability.

  The present invention has been made in view of the above problems, and provides a pressure detection device that can reduce the number of parts as compared with the prior art, can simplify the manufacturing process, and can improve reliability. The purpose is to do.

  In order to achieve the above object, a pressure detection device according to the present invention includes a pressure port into which a fluid is introduced, a pressure sensor disposed in a pressure receiving portion of the pressure port, and a relay terminal connected to a terminal portion of the pressure sensor. And a connector portion having a connector terminal connected to the relay terminal and outputting a signal of the pressure sensor to the outside, wherein the terminal block is connected to the connector terminal. It has a recessed part which receives an insertion end, The relay terminal is arranged in the recessed part, and has a receiving connection part which receives the insertion end and is connected to the connector terminal.

  ADVANTAGE OF THE INVENTION According to this invention, the number of parts can be reduced compared with the past, a manufacturing process can be simplified, and the pressure detection apparatus which can improve reliability can be provided.

The longitudinal cross-sectional view of the pressure detection apparatus which concerns on Embodiment 1 of this invention. The cross-sectional view which follows the II-II line of the pressure detection apparatus shown in FIG. The principal part enlarged view of the longitudinal cross-sectional view of the pressure detection apparatus shown in FIG. The longitudinal cross-sectional view of the pressure detection apparatus which concerns on Embodiment 2 of this invention. The longitudinal cross-sectional view of the pressure detection apparatus which concerns on Embodiment 3 of this invention. The principal part enlarged view of the longitudinal cross-sectional view of the pressure detection apparatus which concerns on Embodiment 4 of this invention.

  Hereinafter, embodiments of a pressure detection device of the present invention will be described in detail with reference to the drawings.

[Embodiment 1]
FIG. 1 is a longitudinal sectional view of a pressure detection device 1 according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view taken along line II-II of the pressure detection device 1 shown in FIG.

  The pressure detection device 1 according to the present embodiment is mounted on various devices to be measured, for example, for environmental compatibility of automobiles and fuel consumption improvement, and measures, for example, a medium to high pressure sensor of about several MPa to several hundred MPa. It is. More specifically, the pressure detection device 1 allows, for example, engine oil pressure, variable valve oil pressure, power steering pressure, in-cylinder injection (DI) pressure, brake oil pressure, pressure of working fluid in the suspension, transmission, air conditioner, etc. Can be measured.

  The pressure detection device 1 mainly includes a pressure port 10, a pressure sensor 20, a terminal block 30, and a connector unit 40. Further, the pressure detection device 1 of the present embodiment further includes a base portion 50 and a cover member 60.

  The pressure port 10 is a substantially cylindrical member connected to the measurement target device, and is formed in a tubular shape having a hollow portion 11 for introducing a fluid therein. The pressure port 10 has an opening 12 for introducing a fluid at one end in the longitudinal direction, and a wall 13 for receiving the fluid pressure at the other end in the longitudinal direction. The wall 13 closes the end of the pressure port 10 opposite to the opening 12 and has a recess 14 that faces the hollow portion 11.

  In the pressure port 10, the concave portion 14 provided in the wall portion 13 is formed in a rectangular shape such as a square or a rectangle corresponding to the shape of the pressure sensor 20 in a plan view from the longitudinal direction of the pressure port 10. The bottom of the concave portion 14 is a pressure receiving portion 15 that is deformed by receiving the pressure of the fluid. That is, the pressure receiving portion 15 is a rectangular thin portion provided on the wall portion 13 of the pressure port 10 and functions as a diaphragm that is deformed by receiving the pressure of the fluid introduced into the hollow portion 11 of the pressure port 10. A pressure sensor 20 is disposed on the end surface of the pressure port 10 opposite to the hollow portion 11 of the pressure receiving portion 15.

  The pressure port 10 has an end portion on the opening 12 side as a large-diameter portion 16 having a larger diameter than an end portion on the pressure receiving portion 15 side, and an end portion on the pressure receiving portion 15 side has a diameter larger than that on the end portion on the opening portion 12 side. The small-diameter portion 17 is small. As shown in FIG. 2, the end portion of the pressure port 10 where the small diameter portion 17, that is, the pressure receiving portion 15 is formed is formed in a cylindrical shape having a flat portion 17 a on a part of the outer peripheral surface. The small diameter portion 17 of the pressure port 10 has two flat portions 17a, a first flat portion 17a1 and a second flat portion 17a2. The surface of the first flat portion 17a1 and the surface of the second flat portion 17a2 are surfaces perpendicular to each other.

  The pressure port 10 has a threaded portion 16 a on the outer peripheral surface of the large diameter portion 16. The screw portion 16a is, for example, a male screw portion that is screwed into an inner screw or a female screw of a socket of the measurement target device. The pressure port 10 includes a flange portion 18 projecting outward in the radial direction and a groove portion 19 recessed inward in the radial direction between the large diameter portion 16 and the small diameter portion 17. The flange portion 18 has a step portion 18a in the thickness direction at the peripheral edge portion. The edge of the opening 51 of the base 50 is engaged with the step 18a.

  The material of the pressure port 10 is, for example, a metal material such as carbon steel, aluminum alloy, copper alloy, and stainless steel. In the pressure port 10, the peripheral edge of the flange 18 is joined to the edge of the opening 51 of the base 50 by, for example, laser welding. Thereby, the welding part W which is the connection part C1 which has airtightness is formed between the pressure port 10 and the base part 50. As shown in FIG. That is, the connection portion C <b> 1 between the pressure port 10 and the base portion 50 has airtightness and liquid tightness, and seals between the pressure port 10 and the base portion 50.

  The base portion 50 is a plate-like member made of a metal material having excellent weldability with the pressure port 10, for example. The base portion 50 has, for example, a circular outer shape as viewed from the direction of the central axis CL of the pressure port 10, and has, for example, a circular opening 51 at the center. As for the base part 50, the opening part 51 engages with the level | step-difference part 18a of the flange part 18 of the pressure port 10, and the edge part of the opening part 51 is joined to the peripheral part of the flange part 18 of the pressure port 10 as mentioned above. And is fixed to the pressure port 10. A terminal block 30 is fixed to the surface of the base portion 50 and the flange portion 18 of the pressure port 10 facing the connector portion 40.

  The terminal block 30 is formed, for example, in a substantially rectangular parallelepiped block shape with rounded corners, and one surface has a surface of the base portion 50 facing the connector portion 40 and a flange portion 18 of the pressure port 10 by, for example, an adhesive. It is bonded and fixed to the surface. As shown in FIG. 2, the terminal block 30 has a generally rectangular shape when viewed from the direction of the central axis CL of the pressure port 10, the width at the center in the longitudinal direction is slightly wider, and the width at both ends in the lengthwise direction is slightly narrower. It has become. The terminal block 30 has an opening 31 for arranging the pressure receiving portion 15 of the pressure port 10 in which the pressure sensor 20 is arranged at the center, and has a plurality of recesses 32 and a relay terminal 33 at one end in the longitudinal direction. ing.

  The opening 31 of the terminal block 30 has a generally sector shape having a circular arc portion 31 a along the outer peripheral surface of the cylindrical small-diameter portion 17 of the pressure port 10 and a straight portion 31 b along the planar flat portion 17 a of the pressure port 10. It is formed in the shape of. The opening 31 of the terminal block 30 is opposed to the first straight portion 31b1 that is the first flat portion facing the first flat portion 17a1 of the pressure port 10 and the second flat portion 17a2 of the pressure port 10. It has two straight portions 31b with a second straight portion 31b2 which is a second plane portion. The first straight line portion 31b1 that is the first flat surface portion and the second straight line portion 31b2 that is the second flat surface portion are formed perpendicular to each other.

  As shown in FIG. 2, a plurality of recesses 32 and relay terminals 33 are provided adjacent to each other in the short direction of the upper surface of the terminal block 30 so as to correspond to the plurality of connector terminals 41 extending from the connector portion 40. . In the pressure detection device 1 of the present embodiment, the terminal block 30 includes, for example, three concave portions 32 and three relay terminals 33 corresponding to the three connector terminals 41 of the connector portion 40.

  3 is an enlarged view of the periphery of the recess 32 and the relay terminal 33 of the terminal block 30 in the longitudinal sectional view of the pressure detecting device 1 shown in FIG.

  The concave portion 32 of the terminal block 30 has an opening 32a on the upper surface of the terminal block 30 facing the connector portion 40, is dug down toward the bottom surface of the terminal block 30 facing the base portion 50, and is bottomed to a predetermined depth. It is a rectangular hole having 32b. The concave portion 32 receives an insertion end portion 41 a that is a tip portion of an elongated connector terminal 41 extending from the connector portion 40 toward the base portion 50. In the recess 32, the insertion end 41a of the connector terminal 41 is inserted, the tip of the insertion end 41a does not reach the bottom 32b, and a gap is formed between the tip of the insertion end 41a and the bottom 32b. Depth.

  The relay terminal 33 of the terminal block 30 is an elongated plate-shaped member made of a conductive metal material such as Au, Cu, Al, and the like, and is integrally coupled to the terminal block 30 by insert molding, for example. Yes. The relay terminal 33 is disposed along the inner wall surface 32 c and the bottom 32 b of the recess 32 and has a receiving connection portion 33 a having a generally U-shaped concave shape, and the center of the terminal block 30. A wire connecting portion 33b extending toward the opening 31 of the portion, and a buried portion 33c extending from the recessed portion 32 to the end portion in the longitudinal direction of the terminal block 30.

  The receiving connection portion 33 a of the relay terminal 33 is disposed in the recess 32, receives the insertion end portion 41 a of the connector terminal 41 inserted into the recess 32, and is connected to the connector terminal 41. In the present embodiment, the receiving connection portion 33 a has a protruding portion 33 d that protrudes toward the insertion end portion 41 a of the connector terminal 41.

  In the present embodiment, the receiving connection portion 33a has a pair of projecting portions 33d that face each other. The protrusion 33d is, for example, a portion in which an elongated plate-shaped relay terminal 33 is curved in the thickness direction and protrudes in the thickness direction, and has a substantially arc-shaped cross-sectional shape. The number of the protrusions 33d is not limited to two, and one protrusion 33d protruding from one side of the receiving connection part 33a toward the insertion end 41a may be formed, or three or more protrusions may be formed. The portion 33d may be formed.

  One end of the wire connection portion 33 b of the relay terminal 33 is connected to the receiving connection portion 33 a, extends toward the opening portion 31 in the center portion of the terminal block 30 along the upper surface of the terminal block 30, and the other end of the wire connection portion 33 b. It is bent in the depth direction of the recess 32 in the vicinity and embedded in the terminal block 30. The wire connection part 33b is exposed on the surface of the terminal block 30, and is connected to one end of the wire 22 formed by, for example, wire bonding. As shown in FIG. 2, the other end of the wire 22 is connected to the terminal portion 21 of the pressure sensor 20.

  One end of the embedded portion 33 c of the relay terminal 33 is connected to the receiving connection portion 33 a, extends from the opening portion 32 a of the recess 32 to the end portion in the longitudinal direction of the terminal block 30, and is almost entirely embedded in the terminal block 30.

  In the pressure detection device 1 of the present embodiment, the terminal block 30 has a guide portion 34 adjacent to the recess 32. The guide part 34 is provided integrally with the terminal block 30, is formed so as to protrude from the surface facing the connector part 40 of the terminal block 30 toward the connector part 40, and the recess 32 of the wire connection part 33 b of the relay terminal 33. The side end portion and the embedded portion 33c are covered. The guide portion 34 has a guide surface 34 a that is inclined in the depth direction of the recess 32 from the outside to the inside of the recess 32.

  The guide surfaces 34 a are provided on both sides of the opening 32 a of the recess 32 in the longitudinal direction of the surface facing the connector portion 40 of the terminal block 30. The distance between the pair of guide surfaces 34a on both sides of the opening 32a of the recess 32 is gradually reduced in the depth direction of the recess 32 from the connector portion 40 toward the terminal block 30.

  The pressure sensor 20 is, for example, a semiconductor strain sensor in which a sensor element and a control circuit are formed on a silicon substrate to be integrated into one chip. For example, the pressure sensor 20 is bonded and fixed to the pressure receiving portion 15 of the pressure port 10 with an adhesive 23, for example. ing. As shown in FIG. 2, the pressure sensor 20 is formed in a rectangular shape such as a square or a rectangle corresponding to the planar shape of the pressure receiving portion 15 in the planar shape viewed from the central axis CL direction of the pressure port 10. The pressure sensor 20 has a terminal portion 21 connected to a relay terminal 33 provided on the terminal block 30.

  The terminal portion 21 of the pressure sensor 20 and the relay terminal 33 of the terminal block 30 are connected by a metal wire 22. The wire 22 can be formed by wire bonding using, for example, Al or Au as a material. The pressure sensor 20 is covered with an insulating gel 24 in a state where the terminal portion 21 is connected to the relay terminal 33 of the terminal block 30 by the wire 22.

  The gel 24 can be formed by potting using, for example, a silicon resin. In FIG. 2, the gel 24 covering the pressure sensor 20 is opposed to the connector portion 40 of the pressure sensor 20 in order to show the connection by the wire 22 between the terminal portion 21 of the pressure sensor 20 and the relay terminal 33 of the terminal block 30. The state cut | disconnected along the surface is shown.

  The connector unit 40 is connected to, for example, a signal line connector that transmits a signal to an electronic control unit (ECU) of an automobile, and transmits a signal from the pressure sensor 20 to an external device such as an ECU via the signal line. To do. The connector section 40 includes a connector terminal 41 that is connected to the relay terminal 33 of the terminal block 30 and outputs a signal from the pressure sensor 20 to the outside, and a housing 42 that is integrally coupled to the connector terminal 41.

  The connector terminal 41 is an elongated plate-like, rod-like, or needle-like member made of a conductive metal material such as Au, Cu, Al, etc., and is integrally coupled to the housing 42 by insert molding, for example. ing. The connector terminal 41 has an insertion end portion 41a connected to the relay terminal 33 of the terminal block 30, and an output end portion 41b connected to a connector terminal of an external device.

  The connector terminal 41 is bent at a substantially right angle between the intermediate portion 41c and the insertion end portion 41a and between the output end portion 41b. Thereby, the connector terminal 41 has the insertion end portion 41a and the output end portion 41b extending along the central axis CL direction of the connector portion 40, and the intermediate portion 41c along the radial direction of the connector portion 40 perpendicular to the central axis CL direction. It extends. The distal end portions of the insertion end portion 41a and the output end portion 41b each have a tapered shape that becomes thinner as approaching the distal end.

  The housing 42 is formed integrally with the connector terminal 41 by insert molding the connector terminal 41 using, for example, an insulating resin material as a raw material. The housing 42 includes, for example, an engaging portion 42a that engages with a signal line connector connected to an external device such as an ECU, and extends in the radial direction of the engaging portion 42a from one end of the engaging portion 42a in the central axis CL direction. And a protruding flange portion 42b.

  The engagement portion 42a is provided with an engagement recess 42c for engaging a signal line connector or the like connected to an external device at the end opposite to the flange portion 42b, and has a hollow portion on the inside. It is formed in a shape. An output end 41b of the connector terminal 41 embedded in the housing 42 of the connector portion 40 is exposed in the engaging recess 42c.

  The engaging portion 42a has an outer shape viewed from the center axis CL direction, for example, formed in a field track shape having a pair of opposing linear flat portions and a pair of arcuate curved portions on both sides thereof. . At the bottom of the engaging recess 42c of the engaging portion 42a, a plurality of connector terminals 41 in the longitudinal direction of the engaging portion 42a, more specifically, as shown in FIG. The relay terminals 33 are arranged at intervals corresponding to the receiving connection portions 33a.

  The flange portion 42b extends from the end of the engaging portion 42a opposite to the engaging recess 42c in a direction perpendicular to the central axis CL direction of the engaging portion 42a, and is viewed from the central axis CL direction of the engaging portion 42a. The outer shape is formed in a circular shape, for example. An intermediate portion 41c of the connector terminal 41 is embedded in the flange portion 42b. The flange portion 42 b protrudes the insertion end 41 a of the connector terminal 41 toward the recess 32 of the terminal block 30 from a position facing the recess 32 on the surface facing the terminal block 30. A cover member 60 is connected to the outer edge portion of the flange portion 42b.

  The cover member 60 is formed in a cylindrical shape having openings 61 and 62 at both ends in the central axis CL direction, for example, using a metal material such as carbon steel, aluminum alloy, copper alloy, and stainless steel. The cover member 60 is integrally coupled with the connector portion 40 by, for example, insert molding, and is connected to the flange portion 42b of the connector portion 40. Thereby, the connection part C2 which has airtightness is formed between the cover member 60 and the connector part 40. FIG.

  One opening 61 in the direction of the central axis CL of the cover member 60 is embedded in the flange portion 42 b of the connector portion 40 and is closed by the connector portion 40. A plurality of through holes 63 are provided in the vicinity of the opening 61. The through hole 63 is filled with the resin material of the connector portion 40, and the cover member 60 is prevented from falling off from the connector portion 40. Around the other opening 62 in the direction of the central axis CL of the cover member 60, a flange portion 64 is formed that extends from the inner side to the outer side in the radial direction perpendicular to the central axis CL. The flange portion 64 is formed by bending the end portion of the cover member 60 extending along the central axis CL from the inner side to the outer side in the radial direction.

  The flange portion 64 of the cover member 60 and the peripheral portion of the base portion 50 are joined by, for example, laser welding, and a welded portion W that is a connection portion C3 having a sealing property is formed between the cover member 60 and the base portion 50. Has been. As described above, one opening 61 in the direction of the central axis CL of the cover member 60 is closed by the connector portion 40, and the other opening 62 in the direction of the central axis CL of the cover member 60 includes the base portion 50 and the pressure port 10. The flange portion 18 is closed. And the connection part C1, C2, C3 which has airtightness between these is formed, and the accommodating part 65 which accommodates the pressure sensor 20 and the terminal block 30 in the sealed state is formed.

  In the pressure detection device 1 according to the present embodiment, the cover member 60 is configured so that the outer shape of the portion between the one opening 61 and the other opening 62 is viewed from the direction of the central axis CL of the cover member 60. As shown in FIG. 2, it has a hexagonal nut shape.

  The pressure detection device 1 of the present embodiment can be assembled by the following procedure, for example. First, the pressure sensor 20 is bonded and fixed to the pressure receiving portion 15 of the pressure port 10 with, for example, an adhesive 23. Next, the edge part of the opening part 51 of the base part 50 is engaged with the step part 18a of the flange part 18 of the pressure port 10, and the pressure port 10 and the base part 50 are joined by laser welding, for example.

  Next, the small diameter portion 17 of the pressure port 10 is inserted into the opening 31 of the terminal block 30, and the flat portion 17 a of the small diameter portion 17 of the pressure port 10 and the straight portion 31 b of the opening 31 of the terminal block 30 are opposed to each other. To align. And the terminal block 30 is joined and fixed to the surface which opposes the flange part 18 of the pressure port 10, and the connector part 40 of the base part 50, for example with an adhesive agent. Then, the wire 22 which connects the terminal part 21 of the pressure sensor 20 and the wire connection part 33b of the relay terminal 33 of the terminal block 30 is formed by a wire bonding apparatus, for example, and the gel 24 which covers the pressure sensor 20 is formed by a potting apparatus. To do.

  Next, for example, the connector part 40 in which the connector terminal 41 and the cover member 60 are integrated by insert molding is prepared. Then, the insertion end 41 a of the connector terminal 41 of the connector portion 40 and the recess 32 of the terminal block 30 are aligned, and the insertion end 41 a of the connector terminal 41 is inserted into the recess 32 of the terminal block 30. The insertion end portion 41a is received by the receiving connection portion 33a of the relay terminal 33 arranged at the position. Thereby, the connector terminal 41 of the connector part 40 and the terminal part 21 of the pressure sensor 20 are electrically connected via the wire 22 and the relay terminal 33. Finally, the flange portion 64 and the base portion 50 of the cover member 60 are joined by, for example, laser welding. As described above, the pressure detection device 1 shown in FIG. 1 can be manufactured.

  Hereinafter, the operation of the pressure detection device 1 of the present embodiment will be described.

  The pressure detection device 1 is mounted on, for example, various devices mounted on an automobile, and the pressure of working fluid such as engine oil pressure, variable valve oil pressure, power steering pressure, DI pressure, brake oil pressure, suspension, transmission, air conditioner, etc. Measure. The pressure detection device 1 is a medium to high pressure sensor that measures a medium to high pressure of, for example, about several MPa to several hundred MPa, and cannot be easily removed even if a malfunction occurs after attachment. For this reason, the pressure detection device 1 is required to have high reliability capable of accurately measuring the pressure of the fluid over a long period of time, but the conventional pressure detection device has a large number of parts and a complicated manufacturing process. Therefore, it is difficult to improve reliability.

  For example, a conventional pressure sensor described in Patent Document 1 (Japanese Patent Laid-Open No. 8-21775) is configured by a leaf spring at a strain gauge terminal portion provided on a diaphragm of a pressure receiving side connection port body. The terminal piece is protruding. The pressure sensor is electrically connected to the printed circuit board by elastically contacting the end of the terminal piece with a conductive portion formed on the printed circuit board. Further, a leaf spring portion extending from the receptacle portion is soldered and electrically connected to the conductive portion of the printed circuit board. The terminal portion of the signal receiving side pressure port body is electrically connected to the printed circuit board by inserting the insertion portion of the portion for external connection into the receptacle connected to the conductive portion of the printed circuit board.

  That is, in the pressure sensor described in Patent Document 1, the strain gauge provided on the diaphragm of the pressure receiving side connection port body and the printed board are connected via the terminal piece. Further, an insertion portion of a portion for external connection provided in the signal receiving side pressure port body is inserted into and connected to a receptacle portion provided in the printed circuit board. Therefore, in order to connect between the strain gauge and the printed circuit board and between the printed circuit board and the insertion portion, a terminal piece and a receptacle are required. Furthermore, it is necessary to align the pressure receiving side connection port body with the printed circuit board and align the printed circuit board with the signal receiving side pressure port body.

  In the conventional pressure transducer described in Patent Document 2 (Japanese Patent Laid-Open No. 2004-205514), the strain gauge sensor provided in the port fitting is a circuit on a circuit board provided in the support member. It is connected to the IC on the circuit board via the path. Further, the IC is connected to a terminal provided in the connector portion via a spring member aligned with the contact spring landing zone on the circuit board. Therefore, in order to connect between the strain gauge sensor and the IC and between the IC and the terminal of the connector portion, the alignment of the strain gauge sensor of the port fitting and the circuit board of the support member, the circuit of the support member It is necessary to align the substrate and the spring member and align the spring member and the terminal of the connector portion.

  On the other hand, the pressure detection device 1 of the present embodiment includes a pressure port 10 into which a fluid is introduced, a pressure sensor 20 disposed in the pressure receiving portion 15 of the pressure port 10, and a terminal portion 21 of the pressure sensor 20. A terminal block 30 having a relay terminal 33 to be connected, and a connector section 40 having a connector terminal 41 connected to the relay terminal 33 and outputting a signal of the pressure sensor 20 to the outside. The terminal block 30 has a recess 32 that receives the insertion end portion 41 a of the connector terminal 41, and the relay terminal 33 is disposed in the recess 32 and receives the insertion end portion 41 a and is connected to the connector terminal 41. A receiving connection 33a is provided.

  With this configuration, the insertion end portion 41 a of the connector terminal 41 of the connector portion 40 and the recess portion 32 of the terminal block 30 are aligned, and the insertion end portion 41 a of the connector terminal 41 is simply inserted into the recess portion 32 of the terminal block 30. Thus, the pressure sensor 20 and the connector terminal 41 can be connected via the relay terminal 33. Therefore, according to the pressure detection device 1 of the present embodiment, the number of parts can be reduced as compared with the conventional pressure detection device, and the manufacturing process can be simplified, thereby improving the reliability.

  Further, in the pressure detection device 1 of the present embodiment, the terminal block 30 has a guide portion 34 adjacent to the recess 32. And the guide part 34 has the guide surface 34a which inclines in the depth direction of the recessed part 32 toward the inner side from the outer side of the recessed part 32. As shown in FIG. Therefore, even when the positions of the insertion end 41 a and the recess 32 are slightly deviated, the tip of the insertion end 41 a can be guided by the guide surface 34 a of the guide 34 and can be inserted into the recess 32 of the terminal block 30. Therefore, the insertion end portion 41 a of the connector terminal 41 of the connector portion 40 can be easily and reliably inserted into the recess 32 of the terminal block 30 and the receiving connection portion 33 a of the relay terminal 33, and the connector terminal 41 and the relay terminal 33 The connection reliability can be improved.

  In the pressure detection device 1 of the present embodiment, the receiving connection portion 33 a of the relay terminal 33 has a protrusion 33 d that protrudes toward the insertion end portion 41 a of the connector terminal 41. Therefore, even if a gap is formed between the receiving connection portion 33a and the insertion end portion 41a due to a dimensional tolerance between the receiving connection portion 33a of the relay terminal 33 and the insertion end portion 41a of the connector terminal 41, the protrusion The portion 33d can be reliably brought into contact with the insertion end portion 41a. Therefore, the connection reliability between the connector terminal 41 and the relay terminal 33 can be improved.

  In addition, manufacture of the relay terminal 33 can be facilitated by using a single protrusion 33d formed on the receiving connection portion 33a of the relay terminal 33. Further, by forming the two projections 33 d facing the receiving connection portion 33 a of the relay terminal 33, the insertion end portion of the connector terminal 41 is sandwiched between them, and the connection reliability between the connector terminal 41 and the relay terminal 33 is determined. Can be improved. Further, by increasing the number of projections 33d formed on the receiving connection portion 33a of the relay terminal 33 to three or more, the number of contacts between the relay terminal 33 and the connector terminal 41 is increased, and the connection between the connector terminal 41 and the relay terminal 33 is increased. Connection reliability can be improved.

  In the pressure detection device 1 of the present embodiment, the end portion of the pressure port 10 where the pressure receiving portion 15 is formed is formed in a cylindrical shape having a flat portion 17a on a part of the outer peripheral surface. The terminal block 30 has an opening 31 in which the pressure receiving portion 15 of the pressure port 10 is disposed. The opening 31 includes an arc portion 31 a along the outer peripheral surface of the pressure port 10 and a flat portion of the pressure port 10. And a straight portion 31b along 17a. Therefore, the small diameter portion 17 formed with the pressure receiving portion 15 of the pressure port 10 is inserted into the opening portion 31 of the terminal block 30, and the flat portion 17a of the pressure port 10 and the linear portion 31b of the terminal block 30 are opposed to each other. By making contact, the pressure receiving portion 15 of the pressure port 10 can be positioned with respect to the terminal block 30.

  More specifically, the pair of flat portions 17a1 and 17a2 perpendicular to each other of the pressure port 10 and the pair of straight portions 31b1 and 31b2 perpendicular to each other of the opening 31 of the terminal block 30 are in contact with each other. Yes. Thereby, the position of the pressure receiving portion 15 of the pressure port 10 is uniquely determined with respect to the terminal block 30, and the terminal portion 21 of the pressure sensor 20 arranged in alignment with the pressure receiving portion 15 and the terminal block 30 are provided. The wire connection portion 33b of the relay terminal 33 is accurately aligned. Therefore, according to the pressure detection device 1 of the present embodiment, when the wire 22 that connects the pressure sensor 20 and the relay terminal 33 is automatically formed by, for example, a wire bonding device, the pressure sensor 20 and the relay terminal 33 The connection reliability by the wire 22 can be improved.

  In the pressure detection device 1 of the present embodiment, the pressure sensor 20 is a semiconductor strain sensor in which the sensor element and the control circuit are integrated into one chip. Therefore, the pressure detection device 1 connects, for example, a sensor element provided in the pressure receiving unit 15 to a control circuit of a circuit board provided separately from the sensor element via a terminal, and further, Compared to a configuration in which the control circuit and the connector terminal 41 of the connector unit 40 are connected via another terminal, the number of parts can be reduced and the manufacturing process can be simplified. Thereby, the connection reliability of the pressure sensor 20 and the connector terminal 41 can be improved.

  In the pressure detection device 1 of the present embodiment, the pressure port 10 is formed in a tubular shape having an opening 12 for introducing a fluid at one end and a wall 13 for receiving the pressure of the fluid at the other end. Reference numeral 15 denotes a rectangular thin-walled portion provided on the wall portion 13. Therefore, the pressure receiving portion 15 functions as a diaphragm that is deformed by the pressure of the fluid introduced from the opening 12 of the pressure port 10 into the hollow portion 11. Therefore, the pressure of the fluid introduced into the hollow portion 11 from the opening portion 12 of the pressure port 10 can be accurately measured by the pressure sensor 20 fixed to the pressure receiving portion 15.

  Further, when viewed from the central axis CL direction of the pressure port 10, the pressure receiving portion 15 is formed in a rectangular shape, and a rectangular pressure sensor 20 corresponding to the shape of the pressure receiving portion 15 is fixed to the pressure receiving portion 15. Thereby, for example, the deformation in the X direction and the Y direction orthogonal to each other along the surface of the pressure receiving unit 15 can be more effectively corrected, and the pressure detection accuracy of the pressure sensor 20 can be improved.

  Further, in the pressure detection device 1 of the present embodiment, the pressure sensor 20 is covered with a gel 24 having a terminal portion 21 and a relay terminal 33 connected by a wire 22 and having insulating properties. Thereby, the pressure sensor 20 and the terminal part 21 can be protected by the gel 24, the reliability of the pressure sensor 20 and the connection reliability between the pressure sensor 20 and the relay terminal 33 are improved, and the reliability of the pressure detection device 1 is improved. Can be improved.

  Further, the pressure detection device 1 of the present embodiment includes a base portion 50 that is connected to the pressure port 10 and supports the terminal block 30, and a cover member 60 that is connected to the connector portion 40 and covers the pressure sensor 20 and the terminal block 30. It is equipped with. And between the pressure port 10 and the base part 50, between the base part 50 and the cover member 60, and between the cover member 60 and the connector part 40, the connection parts C1, C2, C3 having sealing properties are provided. An accommodating portion 65 is formed that accommodates the pressure sensor 20 and the terminal block 30 in a sealed state. Thereby, the pressure sensor 20 and the terminal block 30 can be isolated and protected from the external environment, and the reliability of the pressure detection device 1 used in a harsh environment can be improved.

  Moreover, in the pressure detection apparatus 1 of this embodiment, the pressure port 10 has the thread part 16a screwed together by the measuring object apparatus, and the cover member 60 has a hexagon nut shape. Therefore, when the screw portion 16a of the pressure port 10 is screwed into, for example, the inner screw or the female screw of the socket of the measurement target device, the pressure is applied to the cover member 60 by, for example, a hexagon wrench to It can be fastened to the device to be measured. Thereby, the connection reliability of the pressure detection apparatus 1 and a measuring object apparatus can be improved.

  As described above, according to the pressure detection device 1 of the present embodiment, the number of parts can be reduced as compared with the prior art, the manufacturing process can be simplified, and the reliability can be improved.

[Embodiment 2]
Next, a pressure detection apparatus according to Embodiment 2 of the present invention will be described with reference to FIGS. FIG. 4 is a longitudinal sectional view of the pressure detection device 1A according to the present embodiment.

  The pressure detection device 1A of the present embodiment is the same as that of the first embodiment described above in that the connector terminal 41A of the connector portion 40 has a curved portion 41d between the portion fixed to the connector portion 40 and the insertion end portion 41a. This is different from the pressure detection device 1 described. Since the other points of the pressure detection device 1A of the present embodiment are the same as those of the pressure detection device 1 of the first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted.

  In the pressure detection device 1A, the connector terminal 41A of the connector part 40 is inserted into the intermediate part 41c, which is embedded and fixed in the flange part 42b of the housing 42 of the connector part 40, and the insertion protruding from the flange part 42b toward the terminal block 30. A curved portion 41d is provided between the end portion 41a. The curved portion 41d is formed, for example, by bending an elongated plate-like connector terminal 41A so as to bend in the thickness direction, and has a higher elasticity than other portions of the connector terminal 41A including the insertion end portion 41a. It has sex.

  The pressure detection device 1A is used in, for example, a harsh environment, so that the constituent members expand or contract due to the influence of thermal stress due to a sudden temperature change, and the connector terminal 41A of the connector unit 40 and the relay terminal of the terminal block 30 The positional relationship with 33 may fluctuate. Even in such a case, the stress acting between the insertion end portion 41a and the receiving connection portion 33a of the relay terminal 33 can be relieved by the elastic deformation of the curved portion 41d of the connector terminal 41A.

  Therefore, according to the pressure detection device 1A of the present embodiment, not only the same effect as the pressure detection device 1 of the first embodiment described above is obtained, but the connector terminal 41A and the relay terminal can be used even in a harsh environment. The connection reliability with 33 can be improved.

[Embodiment 3]
Next, a pressure detection apparatus according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 5 is a longitudinal sectional view of the pressure detection device 1B according to the present embodiment.

  The pressure detection device 1B of the present embodiment includes an O-ring between the connector portion 40B and the cover member 60B, and plastically deforms and crimps the opening portion 61 of the cover member 60B, whereby the connector portion 40B and the cover member 60B. Is different from the pressure detection device 1 described in the first embodiment in that the connector terminal 41 of the connector portion 40B is connected to the relay terminal 33B of the terminal block 30 by welding. Yes. Since the other points of the pressure detection device 1B of the present embodiment are the same as those of the pressure detection device 1 of the above-described first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted.

  The connector portion 40B of the pressure detection device 1B of the present embodiment has an annular groove 42d for engaging the O-ring 70 on the outer peripheral surface of the flange portion 42b. The cover member 60B is connected to the flange portion 42b of the connector portion 40B by bending the edge portion of one opening portion 61 inward in the radial direction and plastically deforming and crimping. The O-ring 70 is disposed in the annular groove 42d of the connector part 40B, is compressed between the inner peripheral surface of the cover member 60B, and seals between the connector part 40B and the cover member 60B. Thereby, the connection part C2B which has airtightness is formed between the connector part 40B and the cover member 60B.

  The relay terminal 33B of the pressure detection device 1B of the present embodiment is disposed in the concave portion 32 of the terminal block 30 as in the pressure detection device 1 of the first embodiment, and receives the insertion end 41a of the connector terminal 41 to receive a connector terminal. A receiving connection portion 33 a connected to 41. Further, the relay terminal 33B has a connection end portion 33e extending from the receiving connection portion 33a toward the connector portion 40B along the depth direction of the concave portion 32 of the terminal block 30.

  The connection end portion 33e of the relay terminal 33B is formed of a leaf spring-like thin plate having elasticity and elastically deforming in the thickness direction. When the insertion end 41a of the connector terminal 41 is inserted into the recess 32 of the terminal block 30 and connected to the connection end 33e of the relay terminal 33B, the insertion end 41a of the connector terminal 41 is pressed against the connection end 33e. To be elastically deformed. As a result, the connection end 33e and the insertion end 41a are brought to a predetermined surface pressure in a state where the connection end 33e is urged toward the insertion end 41a of the connector terminal 41 by the elastic force of the connection end 33e. Can be contacted. In this state, the connection end portion 33e and the insertion end portion 41a of the connector terminal 41 can be joined by, for example, welding.

  Similar to the pressure detection device 1 of the first embodiment, the pressure detection device 1B of the present embodiment has a recess 32 in which the terminal block 30B receives the insertion end portion 41a of the connector terminal 41, and the relay terminal 33B has a recess. And a receiving connection portion 33 a that receives the insertion end portion 41 a and is connected to the connector terminal 41. Therefore, according to the pressure detection device 1B of the present embodiment, the number of parts can be reduced as compared with the conventional pressure detection device 1 in the same manner as the pressure detection device 1 of the first embodiment, and the manufacturing process can be simplified. Reliability can be improved.

[Embodiment 4]
Next, a pressure detection apparatus according to Embodiment 4 of the present invention will be described with reference to FIGS. FIG. 6 is an enlarged view of a longitudinal sectional view of the pressure detection device 1C according to the present embodiment.

  The pressure detection device 1C of the present embodiment has a concave portion 42e that exposes the intermediate portion 41c of the connector terminal 41 in the connector portion 40C, and a protective element 80 is provided in the intermediate portion 41c of the connector terminal 41 exposed in the concave portion 42e. This is different from the pressure detection device 1 described in the first embodiment. Since the other points of the pressure detection device 1C of the present embodiment are the same as those of the pressure detection device 1 of the above-described first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted.

  The protection element 80 reduces noise with respect to the output signal of the pressure sensor 20 transmitted by the connector terminal 41 under the usage environment of the pressure detection device 1C. Therefore, according to the pressure detection device 1C of the present embodiment, not only can the same effect as the pressure detection device 1 of the first embodiment described above be obtained, but also noise in the output signal of the pressure sensor 20 can be reduced, and pressure detection can be performed. Accuracy can be improved.

  The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Pressure detection apparatus, 1A Pressure detection apparatus, 1B Pressure detection apparatus, 1C Pressure detection apparatus, 10 Pressure port, 12 Opening part, 13 Wall part, 15 Pressure receiving part, 16a Screw part, 17 Small diameter part (end part), 17a Flat Part, 17a1 flat part, 17a2 flat part, 20 pressure sensor, 21 terminal part, 22 wire, 24 gel, 30 terminal block, 31 opening part, 31a arc part, 31b linear part, 32 concave part, 33 relay terminal, 33a receiving connection Part, 33d projection part, 34 guide part, 34a guide surface, 40 connector part, 41 connector terminal, 41a insertion end part, 41d bending part, 50 base part, 60 cover member, 65 accommodating part, C1 connection part, C2 connection part , C2B connection, C3 connection

Claims (10)

A pressure port into which a fluid is introduced; a pressure sensor disposed at a pressure receiving portion of the pressure port; a terminal block having a relay terminal connected to a terminal portion of the pressure sensor; and the pressure connected to the relay terminal. A connector portion having a connector terminal for outputting a sensor signal to the outside, and a pressure detection device comprising:
The terminal block has a recess for receiving the insertion end of the connector terminal;
The said relay terminal is arrange | positioned at the said recessed part, and has the receiving connection part which receives the said insertion end part and is connected to the said connector terminal, The pressure detection apparatus characterized by the above-mentioned. The terminal block has a guide portion adjacent to the recess,
The pressure detection device according to claim 1, wherein the guide portion has a guide surface that inclines in a depth direction of the recess from the outside to the inside of the recess.   The pressure detection device according to claim 1, wherein the receiving connection portion includes a protrusion protruding toward the insertion end.   The pressure detection device according to claim 1, wherein the connector terminal has a curved portion between a portion fixed to the connector portion and the insertion end portion. The end of the pressure port where the pressure receiving portion is formed is formed in a cylindrical shape having a flat portion on a part of the outer peripheral surface,
The terminal block has an opening in which the pressure receiving portion is disposed, and the opening has an arc portion along the outer peripheral surface of the pressure port and a linear portion along the flat portion of the pressure port. The pressure detection device according to claim 1.   The pressure detection device according to claim 1, wherein the pressure sensor is a semiconductor strain sensor in which a sensor element and a control circuit are integrated into one chip.   The pressure port has an opening for introducing the fluid at one end, and is formed in a tubular shape having a wall portion for receiving the pressure of the fluid at the other end. The pressure receiving portion is a rectangular shape provided on the wall portion. The pressure detection device according to claim 1, wherein the pressure detection device is a thin portion.   2. The pressure detection device according to claim 1, wherein the terminal part and the relay terminal are connected by a wire and covered with an insulating gel. A base portion connected to the pressure port and supporting the terminal block; and a cover member connected to the connector portion and covering the pressure sensor and the terminal block;
Between the pressure port and the base portion, between the base portion and the cover member, and between the cover member and the connector portion, a connection portion having a sealing property is formed, and the pressure sensor and the The pressure detection device according to claim 1, wherein a housing portion for housing the terminal block in a sealed state is formed. The pressure port has a threaded portion that is screwed into the measurement target device,
The pressure detection device according to claim 9, wherein the cover member has a hexagonal nut shape.

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