JP3196199B2 - Pressure detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure detector for detecting a pressure of a fluid by a semiconductor type pressure sensor (hereinafter, referred to as a pressure sensor), and more particularly to a case structure for housing the pressure sensor.

[0002]

2. Description of the Related Art Conventionally, a pressure sensor for measuring the pressure of a gas such as air pressure has a pressure sensor having a cylindrical pressure introduction port at a predetermined position on a circuit board on which a predetermined wiring pattern is formed. (The pressure introduction port protrudes to the back side of the circuit board), and the circuit board is provided in a lower case forming a cylindrical pressure introduction portion having a pressure introduction path for transmitting the pressure to the pressure introduction port. And the circuit board and the pressure sensor are covered with an upper case.

[0003]

In the pressure sensor having the above-described structure, the pressure case is formed in the lower case as a through hole penetrating from the bottom surface of the lower case to the pressure inlet. When disposing the circuit board in the lower case, the tip of the pressure introduction port of the pressure sensor is inserted into the pressure introduction path, and then the circuit board is arranged in the lower case. . However, when disposing the circuit board in the lower case, the pressure introduction path is hidden by the circuit board, and it becomes difficult to insert the tip of the pressure introduction port into the pressure introduction port. There is a problem that the assembly work of the container becomes complicated.

The present invention has been made in view of the above-mentioned problems, and provides a pressure detector capable of simplifying an assembling operation.

[0005]

Means for Solving the Problems The present invention for solving the above problems, a pressure introduction port for introducing the pressure of the fluid, a pressure sensor for detecting the pressure of the fluid, disposing said pressure sensor Before the circuit board and the pressure introduction port
A pressure introduction path for transmitting the pressure, wherein the pressure sensor and
And a case body for storing the circuit board and the case body.
A boss body provided on the circuit board;
Pressure on the pressure introduction path
A cut-out portion where the arrangement position of the introduction port is determined,
A boss is provided to communicate the inside air and outside air of the case body.
And an atmospheric pressure introducing hole .

[0006] A mounting portion for arranging the circuit board is provided around the boss body.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a pressure detector for detecting the pressure of a fluid, wherein the pressure detector has a pressure introduction port 5 for introducing the pressure.
And a circuit board 1 on which the pressure sensor 4 is disposed so that the pressure introduction port 5 protrudes, and a pressure introduction path 10 for housing the pressure sensor 4 and the circuit board 1 and transmitting the pressure to the pressure introduction port 5. The lower case 7 (case body), a boss body 12 formed at a predetermined position of the lower case 7, and a portion corresponding to the boss body 12 of the circuit board 1 when the circuit board 1 is disposed in the lower case 7. With the notch 2 formed, the notch 2 of the circuit board 1 is
2 so that the circuit board 2
Since the position of the pressure introduction port 5 of the pressure sensor 4 disposed in the pressure sensor 4 can be determined, the operation of assembling the pressure detector can be simplified.

Further, by providing the boss body 12 of the lower case 7 with an atmospheric pressure introduction hole 13 for communicating the inside air and the outside air, not only does moisture not enter from the outside, but also a dedicated atmospheric pressure introduction boss body. Since it is not necessary to provide the pressure sensor, the size of the pressure detector can be reduced.

Further, around the boss body 12 of the lower case 7,
Forming the mounting portion 15 for disposing the circuit board 1 enables the circuit board 1 to be stably disposed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the accompanying drawings. In this embodiment, a pressure detector for detecting the pressure of gas (fluid) such as air pressure is used. Will be explained.

FIG. 1 is a sectional view showing a main part of a pressure detector according to the present invention, and FIG. 2 is a plan view showing a state in which a circuit board is provided in a lower case of the pressure detector.

1 and 2, reference numeral 1 denotes a circuit board for compensating the temperature of a pressure sensor described later and amplifying the output from the pressure sensor. This circuit board 1 is made of, for example, paper phenol or glass fiber. A predetermined wiring pattern (not shown) is formed on a substantially rectangular insulating substrate made of resin or the like, and electronic components (not shown) such as a hybrid IC, a resistor, and a capacitor are mounted on predetermined portions (lands) of the wiring pattern. Is done. In the circuit board 1, a cutout 2 corresponding to a boss body of a lower case described later and a through hole 3 through which a pressure introduction port of the pressure sensor is inserted are formed in at least one corner of the circuit board 1. Have been.

Reference numeral 4 denotes a pressure sensor having a diaphragm (not shown) made of silicon or the like. The pressure sensor 4 includes a pressure introduction port 5 for transmitting pressure of gas or the like to the diaphragm, and a pressure sensor 3 for the pressure sensor 3. Each electrode lead 6 for electrical input / output is provided. Accordingly, the pressure sensor 4 is inserted into the through hole 3 of the circuit board 1, and each electrode lead 6 is soldered to a land (not shown) of the circuit board 1.
The pressure introduction port 5 is disposed in a state where the pressure introduction port 5 protrudes from the rear surface side of the second member.

Reference numeral 7 denotes a lower case (case body) made of, for example, a resin material. The lower case 7 is provided with an O-ring holder 8 and an O-ring holder 9 for holding an O-ring holder and an O-ring to be described later. Is formed to extend to the pressure introduction port 5 of the pressure sensor 4, and the pressure introduction path 10 is formed to extend downward together with the cylindrical pressure introduction portion 11. At one end of the lower case 7, a boss 12 corresponding to the cutout 2 of the circuit board 1 is formed so as to extend toward an upper case described later. An atmospheric pressure introduction hole 13 for communicating between the inside air and the outside air sealed by the lower case 7 and the upper case is formed so as to have a predetermined distance. At the other end of the lower case 7, a lead insertion hole 14 for inserting an electric cord to be described later is formed. Further, the lower case 7 is provided for disposing the circuit board 1 around the boss body 12 and at a position corresponding to another corner except for the corner where the cutout 2 of the circuit board 1 is formed. A mounting portion 15 is formed. The circuit board 1 is provided on the mounting portion 15 of the lower case 7 via a silicon-based adhesive.

When the notch 2 of the circuit board 1 is made to correspond to the boss 12 of the lower case 7, the lower case 7 is disposed on the circuit board 1 with respect to the pressure introducing passage 10 of the lower case 7. The arrangement position of the pressure introduction port 5 protruding from the back surface of the circuit board 1 of the pressure sensor 4 is determined. When the circuit board 1 is arranged on the mounting portion 13 of the lower case 7 in this state,
The structure is such that the tip of the pressure introduction port 5 of the pressure sensor 4 disposed on the circuit board 1 is inserted into a pressure introduction passage 10 formed on the bottom surface of the O-ring housing 9.

An upper case 16 is formed of the same material as the lower case 7 and covers the circuit board 1 and the pressure sensor 4. The upper case 16 is disposed on the upper end of the lower case 7 via an epoxy-based adhesive, and is fixed by locking the locking claws 17 of the upper case 16 to the locking portions 18 of the lower case 7. You.

Reference numeral 19 denotes a wiring cord for electrically connecting a power supply to the printed circuit board 1 and an output signal from the pressure sensor 2 to an external peripheral device (not shown). The wiring cord 19 includes a connector 20 for electrically connecting to the circuit board 1 and a waterproof member 21 made of a rubber material for preventing moisture from entering from the wiring cord 19. The wiring cord 19 is temporarily fixed to the lower case 7 by disposing the member 21 in the lead insertion hole 14.

Reference numeral 22 denotes an O-ring made of a rubber material and disposed in the O-ring storage portion 9 of the lower case 7, and hermetically seals a pressure of a fluid or the like transmitted to the pressure introduction port 5 of the pressure sensor 4. Stop.

Reference numeral 23 denotes an O-ring restrainer made of a resin material disposed in the O-ring restraint storage section 8 of the lower case 7,
The O-ring 22 is prevented from floating due to the pressure of a fluid or the like.

The above components constitute a pressure detector.

In the pressure detector having such a configuration, even when the pressure introduction path 10 cannot be confirmed by the circuit board 1 when the circuit board 1 is disposed in the lower case 7, the cutout 2
Correspond to the boss body 12 of the lower case 7,
The arrangement position of the pressure introduction port 5 of the pressure sensor 4 arranged on the circuit board 1 is determined for the pressure introduction path 10 of
When the circuit board 1 is disposed on the mounting portion 13 of the lower case 7 in this state, the tip of the pressure introduction port 5 of the pressure sensor 4
O is introduced into the pressure introducing passage 10 formed on the bottom of the ring housing 9.
Since the pressure detector is inserted through the ring 22, the operation of assembling the pressure detector can be simplified.

The pressure detector as described above is provided with an atmospheric pressure introducing hole for introducing the atmospheric pressure. However, it is preferable to provide the pressure detector on the back side of the lower case 7 in consideration of the mounting of the pressure detector. Therefore, a pressure introducing hole for introducing atmospheric pressure is provided in the lower case 7.
When the boss body for atmospheric pressure introduction is formed so as to have an introduction path having a predetermined length toward the upper case 16 in consideration of moisture intrusion,
By forming the atmospheric pressure introduction hole 13 in the circuit board positioning boss body 12 as in the pressure detector having the above-described configuration, not only moisture does not enter but also the dedicated atmospheric pressure introduction boss body is not provided. For good reasons, the size of the pressure detector can be reduced.

By providing the mounting portion 15 around the boss body 12, the circuit board 1 can be stably disposed.

[0024] In the present embodiment, although so as to form a notch portion at a corner of the circuit board 1, is intended to be modified by the formation position of the boss of the circuit board positioning.

[0025]

According to the present invention, it includes a pressure introduction port for introducing the pressure of the fluid, a pressure sensor for detecting the pressure of the fluid, and a circuit board for disposing the pressure sensor, the pressure guide
A pressure introduction path for transmitting the pressure to an input port;
A case housing the pressure sensor and the circuit board;
A boss body provided on the case body; and a boss body provided on the circuit board.
The boss body is aligned with the pressure introduction path.
Notch in which the arrangement position of the pressure introduction port is determined
And the inside of the case body provided on the boss body.
And an atmospheric pressure introduction hole communicating with the outside air.
Yes, the operation of assembling the pressure detector can be simplified.

Further, according to the present invention, since the boss is provided with an atmospheric pressure introducing hole for communicating the inside air and the outside air, not only does water not enter, but also a dedicated atmospheric pressure introducing boss is not provided. For good reasons, the size of the pressure detector can be reduced.

Further, according to the present invention, since a mounting portion for arranging the circuit board is provided around the boss body,
The circuit board can be stably arranged.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a pressure detector according to an embodiment of the present invention.

FIG. 2 is a plan view showing a state where a circuit board is provided in a lower case of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit board 2 Notch 4 Pressure sensor 5 Pressure introduction port 7 Lower case (case body) 10 Pressure introduction path 12 Boss body 13 Atmospheric pressure introduction hole 15 Mounting part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01H 35/24-35/40 G01L 19/00

Claims (2)

(57) [Claims] [Claim 1 further comprising a pressure introduction port for introducing the pressure of the fluid, a pressure sensor for detecting the pressure of the fluid, and a circuit board for disposing the pressure sensor, the pressure for transmitting the pressure to the pressure inlet port Introductory route
A housing for housing the pressure sensor and the circuit board.
Body, a boss body provided in the case body, and provided on the circuit board,
Arrangement position of the pressure introduction port with respect to the pressure introduction path
And a notch portion determined by the boss body, the inside air and the outside air of the case body
And a communicating atmospheric pressure introducing hole . Surrounding wherein said boss member, a pressure detector according to claim 1, characterized in that it comprises a mounting portion for arranging the circuit board.