CN220649860U

CN220649860U - Pressure test equipment

Info

Publication number: CN220649860U
Application number: CN202322198904.7U
Authority: CN
Inventors: 韩龙; 马瑞江; 曾一笑; 王林
Original assignee: Chengdu CAIC Electronics Co Ltd
Current assignee: Chengdu CAIC Electronics Co Ltd
Priority date: 2023-08-15
Filing date: 2023-08-15
Publication date: 2024-03-22
Anticipated expiration: 2033-08-15

Abstract

The utility model discloses pressure testing equipment, which comprises a shell, wherein a connecting port with an outer wall provided with an interface thread is arranged on the shell, a sensitive head component used for converting pressure into an electric signal is arranged in the connecting port, and a diaphragm used for sensing external pressure is fixed at the end part of the connecting port; the space enclosed by the sensitive head component, the diaphragm and the shell forms a sealed cavity, and the sealed cavity is filled with a medium for transmitting pressure signals; a printed circuit board is arranged in one end of the shell, which is far away from the connecting port, and the printed circuit board is connected with the sensitive head assembly. The core component of the oil-filled packaging type pressure test device is arranged in the threaded connector, the pressure test device which takes oil-filled packaging as a principle and is provided with the threaded connector is designed, the pressure test device can test the pressure of liquid and gas or any non-corrosive fluid and is provided with a small connector, and the pressure test device is convenient for measuring the pressure of the fluid inside the small device.

Description

Pressure test equipment

Technical Field

The utility model relates to the technical field of pressure testing, in particular to pressure testing equipment.

Background

The pressure test equipment in the prior art comprises oil-filled packaging type pressure test equipment and threaded interface type pressure test equipment. The oil-filled packaging type test equipment is generally used for pressure measurement of liquid media, the threaded interface pressure test equipment is generally used for pressure measurement of gas media, but the oil-filled packaging type test equipment is often not provided with an external installation interface, or the external interface is large, so that the oil-filled packaging type test equipment is inconvenient to install on some small devices for pressure measurement, the pressure test equipment for measuring the gas media cannot be used for measuring liquid, the external interface of the pressure test equipment in the prior art is often of a lead type, the lead wire is required to be externally connected, the requirement on a line is high, and hidden danger is large.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides pressure testing equipment, which solves the problem that the pressure testing equipment with a threaded interface in the prior art cannot be used for measuring the pressure of liquid.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the pressure testing device comprises a shell, wherein a connecting port with an outer wall provided with an interface thread is arranged on the shell, a sensitive head component for converting pressure into an electric signal is arranged in the connecting port, and a diaphragm for sensing external pressure is fixed at the end part of the connecting port; the space enclosed by the sensitive head component, the diaphragm and the shell forms a sealed cavity, and a medium for transmitting pressure signals is packaged in the sealed cavity; a printed circuit board is arranged in one end of the shell, which is far away from the connecting port, and the printed circuit board is connected with the sensitive head assembly.

The beneficial effects of the utility model are as follows: the diaphragm of this scheme receives the medium in the sealed cavity of accessible sealed cavity after waiting to detect the extrusion of fluid and transmits pressure signal to sensitive first subassembly, and sensitive first subassembly converts pressure into the signal of telecommunication again and transmits to printed circuit board, is amplified, handles by printed circuit board. The utility model combines the existing pressure test equipment in the form of a threaded interface and the pressure test equipment in the form of an oil-filled package into the pressure test equipment in the form of the oil-filled package and provided with the threaded interface, thereby not only being capable of testing the pressure of any fluid compatible with stainless steel, but also being provided with a small-sized threaded interface and being capable of being used for pressure measurement in a small-sized device.

Further, a medium channel communicated with the sealing cavity is arranged in the connecting port, and a steel ball used for sealing is arranged at the tail end of the medium channel far away from the sealing cavity. During production, firstly, a medium is filled into the sealing cavity from the medium channel, and then the steel balls are welded at the tail end of the medium channel, so that the silicone oil is sealed in the sealing cavity.

Further, a protective cap with the same diameter as the connecting port is fixed at the tail end of the connecting port, and the membrane is arranged between the connecting port and the protective cap. The protective cap is used for protecting the membrane, and the membrane is arranged in the inner space of the protective cap, so that the membrane is prevented from being directly exposed outside the connecting port and is scratched or damaged by an external object.

Further, the sensitive head assembly comprises a sensitive head and an MEMS chip which are fixedly connected with each other, the sensitive head is fixed on the inner wall of the connecting port, and the sensitive head is connected with the printed circuit board through the guide leg.

The beneficial effects of the technical scheme are as follows: the sensitive head can be fixed on the inner wall of the connecting port, so that the MEMS chip is fixed inside the connecting port, the MEMS chip is sealed inside the connecting port, protection is provided for the MEMS chip, the MEMS chip is prevented from being influenced by the outside, and the pin of the sensitive head can electrically connect the MEMS chip with the printed circuit board.

Further, a metal post perpendicular to the printed circuit board is provided on the outer surface of the printed circuit board, and extends to the outside of the housing. The metal posts on the printed circuit board provide electrical connection to the outside, and can transmit electrical signals, and the connection form between the metal posts and the outside is opposite-plug type, similar to a plug and a socket, and is more reliable compared with lead type connection.

Further, the membrane is a flat membrane. The pressure test equipment of this scheme is miniaturized equipment, and the structure size is less, compares in the ripple membrane, adopts flat membrane to carry out the sensitivity that pressure was collected higher.

Further, one end of the sensitive head is fixed on the inner wall of the connecting port, the other end of the sensitive head is fixed on the outer wall of the medium channel, and the MEMS chip is fixed on the lower surface of the sensitive head. The internal space of the threaded connector is very small, and through the design, the medium channel and the sensitive head assembly are reasonably distributed in the connector, so that the space is saved.

Drawings

FIG. 1 is a cross-sectional view of a pressure test rig;

wherein, 1, a protective cap, 2, a membrane, 3 and a sealed cavity; 4. a MEMS chip; 5. a sensitive head; 6. steel balls; 7. a housing; 8. a printed circuit board; 9. a connection port; 10. an interface thread; 11. a leg; 12. and (5) a metal column.

Detailed Description

The following description of the embodiments of the present utility model is provided to facilitate understanding of the present utility model by those skilled in the art, but it should be understood that the present utility model is not limited to the scope of the embodiments, and all the utility models which make use of the inventive concept are protected by the spirit and scope of the present utility model as defined and defined in the appended claims to those skilled in the art.

As shown in fig. 1, the pressure test equipment of this scheme includes casing 7, is provided with connector 9 that the outer wall has interface screw thread 10 on the casing 7, and the internally mounted of connector 9 has the sensitive head subassembly that is used for converting pressure into the signal of telecommunication, and the tip of connector 9 is fixed with the diaphragm 2 that is used for responding to external pressure, and the diaphragm 2 is the flat membrane preferably. The pressure test equipment of this scheme is miniaturized equipment, and the structure size is less, compares in the ripple membrane, adopts flat membrane to carry out the sensitivity that pressure was collected higher. The thickness of the flat film is preferably 0.02mm, and if it is too thin to be broken, the sensitivity is lowered.

The space enclosed by the sensitive head component, the diaphragm 2 and the shell 7 forms a sealed cavity 3, and a medium for transmitting pressure signals is packaged in the sealed cavity 3; the casing 7 is provided with a printed circuit board 8 inside the one end that is kept away from the connector 9, and the printed circuit board 8 is connected with the sensitive head subassembly. The inside of the connecting port 9 is also provided with a medium channel communicated with the sealing cavity 3, and the tail end of the medium channel far away from the sealing cavity 3 is provided with a steel ball 6 for sealing. During production, firstly, a silicone oil medium is filled into the sealing cavity 3 from the medium channel by a vacuum filling technology, and then the steel balls 6 are welded at the tail end of the medium channel by a resistance welding mode, so that the medium is sealed in the sealing cavity 3.

After being extruded by the fluid to be detected, the diaphragm 2 in the scheme can transmit pressure signals to the sensitive head assembly through the medium in the sealing cavity 3, converts the pressure signals into electric signals and transmits the electric signals to the printed circuit board 8, and the printed circuit board 8 amplifies and processes the electric signals. The medium in the sealed cavity 3 is preferably silicone oil, which is incompressible, has high sensitivity in pressure transmission, and is applicable to high temperature environments below 220 ℃.

In implementation, it is preferable that the protective cap 1 having the same diameter as the connecting port 9 is fixed at the end of the connecting port 9, the protective cap 1 is used for protecting the membrane 2, the membrane 2 is arranged between the connecting port 9 and the protective cap 1, the membrane 2 is arranged in the inner space of the protective cap 1, and the membrane 2 is prevented from being directly exposed to the outside of the connecting port 9 and being scratched or damaged by an external object. The protection cap 1, the membrane 2 and the connection port 9 are preferably welded together by means of vacuum electron beam welding. During testing, the protective cap 1 can be embedded into the device to be tested, and then the connecting port 9 is in threaded connection with the device to be tested.

The sensor head assembly comprises a sensor head 5 and a MEMS chip 4 which are fixedly connected with each other, wherein the sensor head 5 is fixed on the inner wall of the connecting port 9, so that the MEMS chip 4 is fixed inside the connecting port 9. The sensor head 5 is connected to the printed circuit board 8 via a lead 11. The MEMS chip 4 is a core component for realizing the functions of electronic products, which can improve the integration level, reduce the size and be placed in the small-sized connection port 9, the printed circuit board 8 is located at the end of the housing 7 to be electrically connected with external equipment, and the sensing head 5 and the lead leg 11 can be used for electrically connecting the MEMS chip 4 with the printed circuit board 8. Because the MEMS chip 4 is a fragile component, the sensitive head 5 is equivalent to sealing the MEMS chip 4 in the internal space of the connection port 9, and provides protection for the MEMS chip 4, so as to avoid the MEMS chip 4 from external influence.

Specifically, one end of the sensitive head 5 is fixed on the inner wall of the connecting port 9, the other end is fixed on the outer wall of the medium channel, and the MEMS chip 4 is fixed on the lower surface of the sensitive head 5 and is in contact with the sealing cavity 3. The threaded connection port 9 can be an M10 threaded interface, the internal space is very small, and through the design, the medium channel and the sensitive head assembly are reasonably distributed in the connection port, so that the space is saved.

The MEMS chip 4 is preferably formed into a sense-head assembly with the sense-head 5 by a leadless sintering technique and the sense-head assembly is welded to the inner wall of the connection port 9 by means of vacuum electron beam welding. The printed circuit board 8 is preferably glued to the inner wall of the housing 7 and is connected to the lead 11 by means of lead soldering. When the diaphragm 2 receives external pressure, the diaphragm 2 deforms towards the inner side of the MEMS core 4, the pressure is transmitted to the silicone oil, the pressure in the silicone oil is equal everywhere and can not be compressed, the pressure is transmitted to the MEMS chip 4, the MEMS chip 4 can output voltages corresponding to the pressures with different magnitudes after receiving the pressure, and then the pressure received by the diaphragm 2 is finally converted into a voltage signal to be output.

In one embodiment of the utility model, the outer surface of the printed circuit board 8 is provided with metal posts 12 perpendicular to the printed circuit board 8, the metal posts 12 protruding outside the housing 7. The external interface of the traditional pressure test equipment is generally of a lead type, the lead is welded and fixed on the circuit board conventionally, but the lead has a certain weight, the middle line segment is easy to hang without a fixed point, and if the lead cannot be well stored, potential circuit hazards such as ageing, peeling, breakage and the like of the outer skin of the lead can be generated. The metal posts 12 on the printed circuit board 8 provide electrical connection to the outside and transmit electrical signals out in a form of a plug-in connection to the outside, similar to a plug and socket, which is more reliable than a lead-type connection.

In summary, the core principle component in the oil-filled packaging type pressure test device is disposed inside the threaded connection port 9, the advantages of the oil-filled packaging type pressure test device and the threaded interface type pressure test device are combined, the oil-filled packaging type pressure test device is changed into a pressure test device with a threaded interface based on the principle of oil filling, the pressure test device can test the pressure of liquid and gas or any non-corrosive fluid, and the pressure test device is provided with a small threaded connection port 9 and can be used for pressure measurement in a small device.

Claims

1. A pressure test device, characterized by: the pressure sensor comprises a shell (7), wherein a connecting port (9) with an interface thread (10) on the outer wall is arranged on the shell (7), a sensitive head assembly for converting pressure into an electric signal is arranged in the connecting port (9), and a diaphragm (2) for sensing external pressure is fixed at the end part of the connecting port (9); the space enclosed by the sensitive head component, the diaphragm (2) and the shell (7) forms a sealed cavity (3), and a medium for transmitting pressure signals is packaged in the sealed cavity (3); a printed circuit board (8) is arranged inside one end, far away from the connecting port (9), of the shell (7), and the printed circuit board (8) is connected with the sensitive head assembly.

2. The pressure testing apparatus of claim 1, wherein: the inside of connector (9) be provided with the medium passageway of sealed cavity (3) intercommunication, the terminal that the medium passageway kept away from sealed cavity (3) is provided with steel ball (6) that are used for the seal.

3. The pressure testing apparatus of claim 1, wherein: the end of the connecting port (9) is fixed with a protective cap (1) with the same diameter as the connecting port (9), and the membrane (2) is arranged between the connecting port (9) and the protective cap (1).

4. The pressure testing apparatus of claim 2, wherein: the sensitive head assembly comprises a sensitive head (5) and an MEMS chip (4) which are fixedly connected with each other, the sensitive head (5) is fixed on the inner wall of the connecting port (9), and the sensitive head (5) is connected with the printed circuit board (8) through a guide leg (11).

5. The pressure testing apparatus of claim 1, wherein: the outer surface of the printed circuit board (8) is provided with a metal column (12) perpendicular to the printed circuit board (8), and the metal column (12) extends to the outside of the shell (7).

6. The pressure testing apparatus of claim 1, wherein: the membrane (2) is a flat membrane.

7. The pressure testing apparatus of claim 4, wherein: one end of the sensitive head (5) is fixed on the inner wall of the connecting port (9), the other end of the sensitive head is fixed on the outer wall of the medium channel, and the MEMS chip (4) is fixed on the lower surface of the sensitive head (5).