阅读说明：本技术 一种压力传感器及其制造方法 (Pressure sensor and manufacturing method thereof ) 是由 周文海 于 2021-09-18 设计创作，主要内容包括：本申请公开了一种压力传感器及其制造方法,涉及传感技术领域。本申请所述的压力传感器包括：连接件,所述连接件包括：连接部,所述连接部用于连接待测流体；容纳部,所述容纳部设置在所述连接部的上端,所述容纳部与所述连接部一体加工制造而成；传感器本体,所述传感器本体安装在所述容纳部内,所述待测流体进入所述容纳部内与所述传感器本体接触。本申请通过采用连接部和容纳部一体加工而成的方式,容纳部作为传感器本体的受压腔,可以直接用于放置安装传感器本体,无需焊接连接,与现有的分体式焊接模式相比,能够避免在大的压力作用下出现焊缝爆裂的情况,降低加工难度,提高产品合格率。(The application discloses a pressure sensor and a manufacturing method thereof, and relates to the technical field of sensing. The pressure sensor of the present application includes: a connector, the connector comprising: the connecting part is used for connecting a fluid to be measured; the accommodating part is arranged at the upper end of the connecting part and is integrally machined and manufactured with the connecting part; the sensor body is installed in the accommodating part, and the fluid to be measured enters the accommodating part and contacts with the sensor body. This application is through the mode that adopts connecting portion and holding portion integrated into one piece to form, and the pressure chamber of holding portion conduct sensor body can directly be used for placing installation sensor body, need not welded connection, compares with current split type welding mode, can avoid appearing the condition that the welding seam bursts under the big pressure effect, reduces the processing degree of difficulty, improves the product percent of pass.)

1. A pressure sensor, comprising:

a connector, the connector comprising:

the connecting part is used for connecting a fluid to be measured;

the accommodating part is arranged at the upper end of the connecting part and is integrally machined and manufactured with the connecting part;

the sensor body is installed in the accommodating part, and the fluid to be measured enters the accommodating part and contacts with the sensor body.

2. A pressure sensor as claimed in claim 1, wherein a fluid passage is provided intermediate the connection portions.

3. A pressure sensor as claimed in claim 1, wherein the sensor body comprises:

the welding table is provided with a welding ring above;

the compression ring is arranged on the outer side of the welding ring;

and the chip sintering seat is arranged on the inner side of the welding ring.

4. A pressure sensor as claimed in claim 3, wherein the weld station comprises:

the pressure sensing surface is arranged at the bottom of the welding table and used for sensing fluid pressure;

the positive pressure channel is arranged at the center of the welding table, and two ends of the positive pressure channel are connected with the pressure sensing surface and the lower end of the chip sintering seat.

5. A pressure sensor according to claim 3, wherein the inner side wall of the accommodating chamber is provided with a first mounting table, and the welding table is mounted on the first mounting table.

6. A pressure sensor as claimed in claim 3, wherein a gap is provided between the die sinter holder and the compression ring, the gap forming an annular channel.

7. The pressure sensor according to claim 3, wherein a lead adapter plate is disposed at an upper end of the chip sintering seat, and a hollow cavity is formed between the lead adapter plate and the chip sintering seat.

8. The pressure sensor according to claim 7, wherein a second mounting platform is disposed inside the accommodating cavity, an outer end of the lead adapter plate is mounted on the second mounting platform, and a potting adhesive larger than 10mm is filled above the lead adapter plate.

9. The pressure sensor according to claim 7, wherein a through hole is formed in a side wall of the accommodating cavity on the side of the hollow cavity, and the through hole is filled with a breathable and waterproof polymer material.

10. A method of installing a pressure sensor, comprising the steps of:

assembling a sensor body: welding and installing a chip sintering seat and a compression ring on the welding table, and installing a lead adapter plate at the upper end of the chip sintering seat;

installing a sensor body: mounting the assembled sensor body in the accommodating cavity;

installing a shell: welding a mounting shell at the upper end of the accommodating cavity;

encapsulating: and potting at least 10mm of potting adhesive above the lead adapter plate.

Technical Field

The present disclosure relates to the field of sensing technologies, and in particular, to a pressure sensor and a method for manufacturing the same.

Background

A pressure sensor is a widely used pressure sensing element, wherein for example a known piezoresistive sensing element comprises a sensor chip, in particular a monocrystalline silicon chip, for determining a pressure, and transmits the pressure to the sensor chip via a diaphragm and a pressure-conducting medium (for example silicone oil).

For example, chinese utility model patent publication No. CN208780386U discloses a pressure sensor, which includes a connecting member for connecting a process fluid to be detected, and having a connecting groove; and the sensor body is welded with the connecting groove and used for sensing the pressure of the process fluid to be detected. The pressure sensor adopting the split welding mode is easy to have the condition of weld joint burst under the action of large pressure, is difficult to process and needs to be improved urgently.

Disclosure of Invention

The application aims to provide a pressure sensor and a manufacturing method thereof, and the problem that a welding line is prone to bursting of the pressure sensor produced in the existing split type welding mode is solved.

In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions: a pressure sensor, comprising: a connector, the connector comprising: the connecting part is used for connecting a fluid to be measured; the accommodating part is arranged at the upper end of the connecting part and is integrally machined and manufactured with the connecting part; the sensor body is installed in the accommodating part, and the fluid to be measured enters the accommodating part and contacts with the sensor body.

In above-mentioned technical scheme, this application embodiment is through the mode that adopts connecting portion and holding portion integrated into one piece to form, and the holding portion can directly be used for placing the installation sensor body as the pressurized cavity of sensor body, need not welded connection, compares with current split type welding mode, can avoid appearing the condition that the welding seam bursts under the big pressure effect, reduces the processing degree of difficulty, improves the product percent of pass.

Further, according to the embodiment of the application, a fluid channel is arranged in the middle of the connecting part.

Further, according to this application embodiment, wherein, the sensor body includes: the welding table is provided with a welding ring above; the compression ring is arranged on the outer side of the welding ring; and the chip sintering seat is arranged on the inner side of the welding ring. .

Further in accordance with an embodiment of the present application, wherein the bonding stage comprises: the pressure sensing surface is arranged at the bottom of the welding table and used for sensing fluid pressure; the positive pressure channel is arranged at the center of the welding table, and two ends of the positive pressure channel are connected with the pressure sensing surface and the lower end of the chip sintering seat.

Further, according to this application embodiment, wherein, the inside wall that holds the chamber is provided with mount table one, the welding bench is installed on mount table one.

Further, according to the embodiment of the application, a gap is left between the chip sintering seat and the compression ring, and the gap forms an annular channel.

Further, according to the embodiment of the application, wherein a lead adapter plate is arranged at the upper end of the chip sintering seat, and a hollow cavity is formed between the lead adapter plate and the chip sintering seat.

Further, according to the embodiment of this application, wherein, state and hold the intracavity side and be provided with mount table two, install the outer end of lead wire keysets on mount table two, the top embedment of lead wire keysets has the casting glue that is greater than 10 mm.

Further, according to the embodiment of the application, wherein, be provided with the through-hole on the chamber lateral wall that holds of hollow cavity side, the through-hole intussuseption is filled with ventilative waterproof macromolecular material.

In order to achieve the above object, an embodiment of the present application further discloses a method for mounting a pressure sensor, including the following steps:

assembling a sensor body: welding and installing a chip sintering seat and a compression ring on the welding table, and installing a lead adapter plate at the upper end of the chip sintering seat;

installing a sensor body: mounting the assembled sensor body in the accommodating cavity;

installing a shell: welding a mounting shell at the upper end of the accommodating cavity;

encapsulating: and potting at least 10mm of potting adhesive above the lead adapter plate.

Compared with the prior art, the method has the following beneficial effects: this application is through the mode that adopts connecting portion and holding portion integrated into one piece to form, and the pressure chamber of holding portion conduct sensor body can directly be used for placing installation sensor body, need not welded connection, compares with current split type welding mode, can avoid appearing the condition that the welding seam bursts under the big pressure effect, reduces the processing degree of difficulty, improves the product percent of pass.

Drawings

The present application is further described below with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of a pressure sensor in the present application.

Fig. 2 is a schematic view of the structure of the connector of fig. 1.

Fig. 3 is a schematic structural diagram of the sensor body in fig. 1 and a schematic structural diagram of the installation of the sensor body and the connecting member.

Fig. 4 is a partially enlarged view of a portion a in fig. 3.

Fig. 5 is a partially enlarged view of fig. 1 at B.

In the attached drawings

1. Connecting piece 11, connecting part 12 and accommodating part

13. A connecting thread I14, a fluid channel 15 and a mounting platform I

16. Mounting table II 17 and through hole

2. Sensor body 21, soldering land 211, and pressure-sensitive surface

212. Sealing ring 213, positive pressure channel 214 and welding ring

22. Compression ring 23, chip sintering seat 231 and chip

232. Gold wire 233, protective cover 234, negative pressure channel

24. Lead adapter plate 25, support platform 26 and hollow cavity

27. Oil-filled tube

3. Shell body

4. Pouring sealant

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clear and fully described, embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of some embodiments of the invention and are not limiting of the invention, and that all other embodiments obtained by those of ordinary skill in the art without the exercise of inventive faculty are within the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one skilled in the art that the embodiments may be practiced without these specific details. In some instances, well-known methods and structures have not been described in detail so as not to unnecessarily obscure the embodiments. In addition, all embodiments may be used in combination with each other.

[ example 1 ]

Fig. 1 is a schematic structural diagram of a pressure sensor in the present application, and fig. 2 is a schematic structural diagram of a connector 1 in fig. 1. As shown in fig. 1-2, the pressure sensor includes a connector 1, a sensor body 2, and a housing 3. The connecting piece 1 comprises a connecting portion 11 and an accommodating portion 12, the connecting portion 11 is specifically a T-shaped connecting piece, a first connecting thread 13 is arranged at the lower end of the connecting portion and used for connecting equipment or a device to be detected, and a fluid channel 14 is arranged in the middle of the connecting portion and used for leading in fluid to be detected. The sensor body 2 is installed in the containing part 12, and a fluid to be detected enters the containing part 12 through the fluid channel 14 and contacts with the sensor body 2, so that the pressure detection of the fluid is realized. The upper end of the accommodating part 12 is an opening, and the opening is connected with the shell 3 in a welding way.

In above-mentioned technical scheme, this application adopts the mode that connecting portion 11 and the 12 integrated into one piece that hold form, and hold 12 as the pressurized chamber of sensor body 2, can directly be used for placing installation sensor body 2, need not welded connection, compares with current split type welding mode, can avoid appearing the condition that the welding seam bursts under big pressure effect, reduces the processing degree of difficulty, improves the product percent of pass.

[ example 2 ]

Further, fig. 3 is a schematic structural diagram of the sensor body 2 and a schematic structural diagram of the installation of the sensor body 2 and the connecting member 1 in the present application. Fig. 4 is a partially enlarged view of a portion a in fig. 3. Fig. 5 is a partially enlarged view of fig. 1 at B. As shown in fig. 3 to 5, the sensor body 2 includes a bonding stage 21, a clamp ring 22, and a die-bonding pad 23 in the embodiment 1. The bottom of the welding stage 21 is provided with a pressure sensing surface 211, the pressure sensing surface 211 is opposite to the fluid channel 14 and is used for sensing the pressure of the fluid to be measured, and the pressure sensing surface 211 is embodied as concentric annular ripples. The periphery of welding bench 21 collar, and hold the lower extreme inside wall of chamber 12 and be provided with the mount table one 15 that corresponds with it, make welding bench 21 install on mount table one 15 through this collar. A sealing ring 212 is arranged between the first mounting platform 15 and the mounting ring. The center of the welding table 21 is provided with a positive pressure channel 213, the positive pressure channel 213 is vertically arranged, two ends of the positive pressure channel 213 are connected with the pressure sensing surface 211 and the lower end of the chip sintering seat 23 to form a positive pressure cavity of the pressure sensor, and the pressure sensed by the pressure sensing surface 211 is transmitted to the chip sintering seat 23.

Secondly, a welding ring 214 is arranged above the welding table 21, and the chip sintering seat 23 is installed in the welding ring 214 and is connected with the welding ring 214 in a welding mode, so that the positive pressure cavity is sealed. The lower end of the chip sintering seat 23 is provided with a binding plate, and the binding plate is provided with a chip 231 and a gold wire 232. A protection plate 233 is disposed between the binding plate and the welding stage 21, and a hole is disposed in the protection plate 233 so that the positive pressure channel 231 can communicate with the lower end surface of the chip 231 to transmit fluid pressure to the lower end surface of the chip 231. A lateral negative pressure passage 234 is provided in the die-sintering seat 23, and the negative pressure passage 234 communicates with the upper end surface of the die 231 and transmits the reference atmospheric pressure to the upper end surface of the die 231.

A support table 25 is provided at the upper end of the die bonder 23, and a lead adapter 24 is attached to the upper end of the support table 23. In this regard, the inner side wall of the upper end of the accommodating cavity 12 is provided with a second mounting table 16, and the outer end of the lead adapter plate 24 is placed and mounted on the second mounting table 16. The potting adhesive 4 with the thickness larger than 10mm is potted at the upper end of the lead adapter plate 24, so that the lead adapter plate 24 is fixedly connected with the accommodating cavity 12. So far, a hollow cavity 26 is formed between the lead adapter plate 24 and the chip sintering seat 23, a through hole 17 is formed in a corresponding position of the side wall of the accommodating cavity 12, and a breathable and waterproof polymer material is filled in the through hole 17, so that the hollow cavity 26 is communicated with the atmosphere.

Furthermore, two oil filling pipes 27 are vertically arranged in the chip sintering seat 23, and pressure guiding media are respectively filled into the positive pressure channel 213 and the negative pressure channel 234.

In addition, the compression ring 22 is installed on the outer side of the welding ring 214, the compression ring 22 is welded with the welding table, a gap is reserved between the inner side of the compression ring 22 and the chip sintering seat 23, the gap forms an annular channel, and the annular channel is respectively communicated with the hollow cavity 26 and the negative pressure channel 234 to form a negative pressure cavity of the pressure sensor. The periphery of the upper end of the clamp ring 22 is provided with a ring of elastic body, and the elastic body is precisely attached to the inner side wall of the accommodating cavity 12, so that the sensor body is fixedly installed in the accommodating cavity 12.

In above-mentioned technical scheme, sensor body 2 in this application is the modularization setting, and installs in holding chamber 12 through non-welded mode, if the condition of damage appears in sensor body 2, can take out sensor body 2 and chip 231 wherein fast, directly do the change, original connecting piece 1 can continue to obtain the use, reduces the extravagant improvement maintenance efficiency of cost, and then reduces cost of maintenance.

[ example 3 ]

The embodiment of the application also discloses a manufacturing method of the pressure sensor, which comprises the following steps:

assembling the sensor body 2: welding and installing a chip sintering seat 23 and a compression ring 22 on the welding table 21, and installing a lead adapter plate 24 on the upper end of the chip sintering seat 23;

mounting the sensor body 2: placing a sealing ring 212 in the accommodating cavity 12 of the connecting piece 1, and installing the assembled sensor body 2 in the accommodating cavity 12;

installing a shell: the housing 3 is welded at the upper end of the accommodating cavity 12;

encapsulating: and potting the potting adhesive with the thickness of at least 10mm above the lead adapter plate 24.

Although the illustrative embodiments of the present application have been described above to enable those skilled in the art to understand the present application, the present application is not limited to the scope of the embodiments, and various modifications within the spirit and scope of the present application defined and determined by the appended claims will be apparent to those skilled in the art from this disclosure.