Pressure sensor

Abstract

The utility model relates to a pressure sensor which comprises an upper shell and a lower shell, a medium inlet pipe is arranged on the upper shell, a medium cavity communicated with the medium inlet pipe is formed in the upper shell, an installation cavity communicated with the medium cavity is formed in the lower shell, a pressure sensing module is arranged in the installation cavity, and an electric signal transmission elastic piece is arranged on the inner bottom face of the installation cavity. One end of the electric signal transmission elastic piece is connected to the pressure sensing module, the other end is connected with a pressure transmission wiring end, and the output end of the pressure transmission wiring end extends out of the lower shell. When the interior of an automobile cannot provide sufficient installation space for a conventional pressure sensor, a worker installs the pressure sensor with the medium inlet pipe arranged on the upper shell in the automobile, interference between the pressure sensor and other parts during installation is avoided, and therefore the installation requirements of automobiles of different models are met.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of sensors, in particular to a pressure sensor. BACKGROUND

[0002] The pressure sensor is a device for measuring various pressure parameters, which converts the change of pressure into an electrical signal output through sensing the change of pressure. The pressure sensor is widely applied to automobile systems so that the electronic control unit of the automobile can monitor and control the running state of each system of the automobile in real time.

[0003] The conventional pressure sensor generally comprises an upper shell, a lower shell and a medium inlet pipe arranged on the lower shell. When the pressure sensor is installed, the lower shell needs to be installed in the automobile interior, and the medium inlet pipe needs to be communicated with the pressure medium pipeline to be detected.

[0004] However, the installation position of the pressure sensor on the automobile is strictly limited by the space layout, pipeline layout and circuit connection mode of the automobile. The space layouts in the interiors of different models of automobiles are different. Therefore, the interiors of some automobile models cannot provide sufficient installation space for the medium inlet pipe arranged on the lower shell, or cannot be communicated with the medium inlet pipe arranged on the lower shell due to pipeline problems, so that the conventional pressure sensor cannot be successfully installed in the automobile interior, and obvious defects exist. CONTENT OF THE INVENTION

[0005] In order to meet the installation requirements of different models of automobiles, the application provides a pressure sensor.

[0006] The application provides a pressure sensor adopting the following technical scheme:

[0007] The pressure sensor comprises an upper shell and a lower shell. A medium inlet pipe is arranged on the upper shell. A medium cavity in communication with the medium inlet pipe is formed in the upper shell. An installation cavity in communication with the medium cavity is formed in the lower shell. A pressure sensing module is arranged in the installation cavity. An electrical signal transmission spring is arranged on the inner bottom surface of the installation cavity. One end of the electrical signal transmission spring is connected to the pressure sensing module, and the other end of the electrical signal transmission spring is connected with a pressure transmission wiring end. The output end of the pressure transmission wiring end extends out of the lower shell.

[0008] When the automobile interior cannot provide sufficient installation space for the conventional pressure sensor, the worker installs the lower shell of the pressure sensor in the automobile interior, and the medium inlet pipe is in communication with the pressure medium, the pressure medium flows along the medium inlet pipe of the upper shell into the installation cavity in the upper shell, and the pressure of the medium is converted into an electrical signal by the pressure sensing module, the electrical signal is conducted to the pressure transmission wiring end through the electrical signal transmission spring, and finally the electrical signal is transmitted to the electronic control unit of the automobile. The design of arranging the medium inlet pipe on the upper shell improves the adaptability of the pressure sensor installation, avoids interference between the pressure sensor and other components during installation, and meets the installation requirements of different models of automobiles.

[0009] Optionally, a medium channel in communication with the installation cavity is arranged in the medium inlet pipe, and the medium channel is arranged in an inclined manner along the medium flow direction.

[0010] By adopting the above technical scheme, the inclined medium channel effectively increases the installation space of the pressure sensor in the horizontal or vertical direction, and adapts to the limited installation environment in the vehicle body.

[0011] Optionally, the opposite surfaces of the upper shell and the lower shell are inclined surfaces, the medium cavity and the installation cavity are arranged on the inclined surfaces of the upper shell and the lower shell respectively, a sealing element is arranged between the upper shell and the lower shell, and the sealing element is arranged in an inclined manner.

[0012] By adopting the above technical scheme, the opposite surfaces of the upper shell and the lower shell are designed as inclined surfaces, so that the medium cavity and the installation cavity can be arranged in the inclined space to a certain extent. Compared with the traditional flat shell design, the inclined surface can reduce the horizontal installation space of the pressure sensor, adapt to the limited installation environment in the vehicle body, and the sealing element improves the sealing performance of the pressure sensor as a whole, effectively prevents the pressure medium from leaking, and improves the measurement accuracy of the pressure sensor.

[0013] Optionally, the sealing element comprises a sealing ring and a sealing boss, an inner circle of the sealing boss is in communication with the medium cavity, the sealing boss is arranged on the sealing ring, a sealing groove is arranged on the inclined surface of the upper shell, a sealing boss ring is arranged on the inclined surface of the lower shell, and the sealing ring and the sealing boss are made of elastic material. When the upper shell is connected with the lower shell, one side of the outer surface of the sealing boss abuts against the inner side wall of the sealing groove, and the other side abuts against the pressure sensor module, and the outer surface of the sealing boss ring abuts against the sealing ring.

[0014] By adopting the technical scheme, in the process of mounting the upper shell on the lower shell, the outer side wall of the sealing boss is tightly attached to the inner side wall of the sealing groove, the possibility of leakage of the pressure medium from the upper shell is reduced, meanwhile, the sealing ring piece is pressed on the sealing boss on the lower shell by the upper shell, the possibility of the pouring glue entering the internal cavity of the product in the subsequent process is reduced, the upper shell and the lower shell are in a sealed state by such arrangement, the medium cavity and the mounting cavity are in a closed environment, and the leakage of the pressure medium is effectively prevented.

[0015] Optionally, the bottom surface of the mounting cavity is provided with a positioning taper, and the telecommunication signal transmission spring piece is provided with a positioning hole in sliding fit with the positioning taper.

[0016] By adopting the technical scheme, in the process of mounting the telecommunication signal transmission spring piece, the worker accurately mounts the telecommunication signal transmission spring piece in the mounting cavity by the positioning taper and the positioning hole, the positional deviation in the mounting process is avoided, meanwhile, in the process of running of the automobile, the pressure sensor is subjected to external forces such as vibration and impact, the cooperation of the positioning taper and the positioning hole can effectively prevent the telecommunication signal transmission spring piece from being deviated and misaligned, the telecommunication signal transmission spring piece is ensured to be always in good connection with the pressure sensing module and the pressure transmission wiring end, so that the stable transmission of the pressure signal is ensured.

[0017] Optionally, the lower shell is provided with a plurality of fixing grooves, the upper shell is provided with a fixing column corresponding to the fixing grooves, the fixing column is in sliding connection in the fixing groove, and the fixing column is provided with an anti-disengagement piece for pressing the lower shell on the upper shell.

[0018] By adopting the technical scheme, in the process of assembling the pressure sensor, the installer inserts the fixing column into the corresponding fixing groove, so that the upper shell and the lower shell are combined together, and then the lower shell is pressed on the upper shell by the anti-disengagement piece, the fixing column and the fixing groove facilitate the worker to quickly and accurately position, the positional deviation caused by inaccurate positioning is reduced, the relative positions of the components in the pressure sensor are ensured to be accurate, so that the precision of the pressure detection is ensured.

[0019] Optionally, the anti-disengagement piece comprises a hot riveting head penetrating out of the lower shell, the fixing column is made of a heat-fusible material, the hot riveting head is made after the fixing column is heated and fused, and the hot riveting head abuts against the lower shell.

[0020] By adopting the technical scheme, after the upper shell is mounted on the lower shell, the fixing column extending out of the lower shell is heated and melted, then the special hot riveting tool is pressed on the melted fixing column and a certain pressure is applied to make the melted fixing column abut against the lower shell and naturally cool down, and the hot riveting head is formed after the melted fixing column cools down, since the diameter of the hot riveting head is larger than the diameter of the fixing groove, the upper shell and the lower shell are tightly connected, the possibility of separation of the upper shell and the lower shell is reduced, and the sealing property between the upper shell and the lower shell is improved.

[0021] To sum up, the present application has at least one of the following beneficial technical effects:

[0022] 1. The medium inlet pipe is arranged on the upper shell, when the automobile interior cannot provide sufficient installation space for the conventional pressure sensor, the worker installs the lower shell of the pressure sensor provided by the utility model in the automobile interior, the design of the pressure sensor improves the adaptability of the pressure sensor installation, avoids interference between the pressure sensor and other components during installation, and thus meets the installation requirements of different models of automobiles.

[0023] 2. The sealing element is arranged, the outer side wall of the sealing boss is tightly attached to the inner side wall of the sealing groove during the installation of the upper shell on the lower shell, the possibility of leakage of the pressure medium from the upper shell is reduced, meanwhile, the sealing ring piece is pressed on the sealing boss on the lower shell by the upper shell, the possibility of the subsequent process of the pouring of the pouring glue into the product internal cavity is reduced, the arrangement makes the upper shell and the lower shell be in a sealed state, the medium cavity and the installation cavity are in a closed environment, and the leakage of the pressure medium is effectively prevented. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of an embodiment of the present application.

[0025] Figure 2 is an explosion schematic diagram of the upper shell, the sealing element and the lower shell in the embodiment of the present application.

[0026] Figure 3 is a sectional view of the upper shell and the lower shell in the embodiment of the present application.

[0027] Mark 1, upper shell; 2, lower shell; 21, fixing groove; 211, clamping groove; 3, fixing column; 4, anti-dropping element; 41, hot riveting head; 5, medium inlet pipe; 51, medium passage; 6, medium cavity; 7, installation cavity; 71, pressure sensing module; 72, electric signal transmission sheet; 721, positioning hole; 73, positioning cone; 74, pressure transmission wiring end; 8, sealing element; 81, sealing ring piece; 82, sealing boss; 83, sealing boss ring; 9, sealing groove. DETAILED DESCRIPTION

[0028] The application will be further described below in conjunction with the accompanying drawings. Figures 1-3 The application will be further described below in conjunction with the accompanying drawings.

[0029] The application discloses a pressure sensor.

[0030] Referring to Figure 1 and Figure 2 A pressure sensor comprises an upper shell 1 and a lower shell 2, the bottom surface of the lower shell 2 is used for mounting in the interior of a vehicle, the upper shell 1 and the lower shell 2 are both made of plastic, a plurality of fixing columns 3 are welded on the upper shell 1, in the embodiment, the number of the fixing columns 3 is four, the four fixing columns 3 are respectively arranged at four corner edges of the upper shell 1, a plurality of fixing grooves 21 corresponding to the four fixing columns 3 are formed on the lower shell 2, the fixing columns 3 are slidingly connected in the corresponding fixing grooves 21, the bottom end of the fixing column 3 is provided with an anti-dropping piece 4, the anti-dropping piece 4 is used for pressing the lower shell 2 on the upper shell 1, the anti-dropping piece 4 comprises a hot rivet head 41 which is formed by hot melting of the fixing column 3, the fixing column 3 is made of a material which can be melted by heat, the hot rivet head 41 is formed by hot melting of the fixing column 3, and the hot rivet head 41 abuts against the lower shell 2.

[0031] When assembling the pressure sensor, an installer inserts the four fixing columns 3 into the corresponding fixing grooves 21 respectively, so that the upper shell 1 and the lower shell 2 are combined together, then the installer heats and melts the fixing column 3 which extends to the outside of the lower shell 2, then a special hot riveting tool is pressed on the melted fixing column 3 and a certain pressure is applied, so that the melted fixing column 3 abuts against the lower shell 2 and is naturally cooled, the melted fixing column 3 is cooled to form the hot rivet head 41, since the diameter of the hot rivet head 41 is greater than the diameter of the fixing groove 21, the upper shell 1 and the lower shell 2 are tightly connected, the possibility of separation of the upper shell 1 and the lower shell 2 is reduced, and the sealing property between the upper shell 1 and the lower shell 2 is improved.

[0032] Referring to Figure 2 and Figure 3 The upper shell 1 is integrally formed with a medium inlet pipe 5, a medium passage 51 is formed in the medium inlet pipe 5, the medium passage 51 is arranged obliquely along the flow direction of the pressure medium, the obliquely arranged medium passage 51 effectively saves the installation space in the horizontal or vertical direction of the pressure sensor, and adapts to the limited installation environment in the vehicle body.

[0033] Referring to Figure 2 and Figure 3The upper housing 1 and the lower housing 2 have opposing inclined surfaces. A medium cavity 6 communicating with the medium channel 51 is formed on the inclined surface of the upper housing 1. A mounting cavity 7 communicating with the medium cavity 6 is formed on the inclined surface of the lower housing 2. The mounting cavity 7 is stepped, and a pressure sensing module 71 is mounted on the stepped end face of the mounting cavity 7. Multiple electrical signal transmission springs 72 are connected to the bottom surface of the pressure sensing module 71. In this embodiment, there are three electrical signal transmission springs 72, and the ends of the electrical signal transmission springs 72 are in contact with the circuit portion of the pressure sensing module 71. The inner bottom surface of the mounting cavity 7 is fixedly connected with positioning cones 73 corresponding to the three electrical signal transmission springs 72. The electrical signal transmission springs 72 are provided with positioning holes 721 that slide with the corresponding positioning cones 73. The cooperation between the positioning cones 73 and the positioning holes 721 effectively prevents the electrical signal transmission springs 72 from shifting or misaligning, ensuring stable transmission of pressure signals. One end of the electrical signal transmission spring 72 is connected to the bottom surface of the pressure sensing module 71, and the other end is connected to a pressure transmission terminal 74. The output end of the pressure transmission line extends to the outside of the lower housing 2.

[0034] After the upper housing 1 and the lower housing 2 are assembled, the worker connects the medium inlet pipe 5 to the pressure medium. The pressure medium flows along the medium inlet pipe 5 of the upper housing 1 to the mounting cavity 7 in the upper housing 1, and the pressure of the medium is converted into an electrical signal by the pressure sensing module 71. The electrical signal is transmitted to the pressure transmission terminal 74 through the electrical signal transmission spring 72, and finally the electrical signal is transmitted to the electronic control unit of the car.

[0035] Reference Figure 2 and Figure 3 To improve the sealing performance of the lower housing 2 and prevent leakage of the pressure medium, a sealing element 8 is provided between the upper housing 1 and the lower housing 2. The sealing element 8 includes a sealing ring 81 arranged between the pressure sensing module 71 and the upper housing 1. The inner ring of the sealing ring 81 is connected to the medium cavity 6. A sealing groove 9 is provided on the inclined surface of the upper housing 1. A sealing boss 82 that mates with the sealing groove 9 is integrally formed on the sealing ring 81. A sealing protrusion 83 is fixedly connected to the inclined surface of the lower housing 2. Both the sealing ring 81 and the sealing boss 82 are made of rubber.

[0036] During the installation of the upper housing 1 onto the lower housing 2, the outer wall of the sealing boss 82 is tightly attached to the inner wall of the sealing groove 9, reducing the possibility of pressure medium leakage from the upper housing 1. At the same time, the sealing ring 81 is pressed by the upper housing 1 onto the sealing boss 83 on the lower housing 2, reducing the possibility of potting compound entering the internal cavity of the product in subsequent processes. This arrangement ensures that the upper housing 1 and the lower housing 2 are in a sealed state, and that the medium cavity 6 and the installation cavity 7 are both in a closed environment, effectively preventing the occurrence of pressure medium leakage.

[0037] The implementation principle of a pressure sensor according to an embodiment of this application is as follows: When the interior of a car cannot provide sufficient installation space for a conventional pressure sensor, the worker installs the lower housing 2 of the pressure sensor provided by this utility model inside the car. Simultaneously, the medium inlet pipe 5 is connected to the pressure medium. The pressure medium flows along the medium inlet pipe 5 of the upper housing 1 into the mounting cavity 7 within the upper housing 1. The pressure of the medium is converted into an electrical signal by the pressure sensing module 71. This electrical signal is transmitted through the electrical signal transmission spring 72 to the pressure transmission terminal 74, and finally, the electrical signal is transmitted to the car's electronic control unit. The design of placing the medium inlet pipe 5 on the upper housing 1 improves the adaptability of the pressure sensor installation, avoids interference between the pressure sensor and other components during installation, and thus meets the installation requirements of different car models.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pressure sensor, comprising an upper housing (1) and a lower housing (2), characterized in that, The upper housing (1) is provided with a medium inlet pipe (5), and a medium cavity (6) communicating with the medium inlet pipe (5) is opened inside the upper housing (1). The lower housing (2) is provided with an installation cavity (7) communicating with the medium cavity (6). A pressure sensing module (71) is provided inside the installation cavity (7). An electrical signal transmission spring (72) is provided on the inner bottom surface of the installation cavity (7). One end of the electrical signal transmission spring (72) is connected to the pressure sensing module (71), and the other end is connected to a pressure transmission terminal (74). The output end of the pressure transmission terminal (74) extends out of the lower housing (2).

2. A pressure sensor according to claim 1, characterized in that, The medium inlet pipe (5) has a medium channel (51) that communicates with the mounting cavity (7), and the medium channel (51) is inclined along the medium flow direction.

3. A pressure sensor according to claim 1, characterized in that, The surfaces of the upper housing (1) and the lower housing (2) are inclined surfaces. The medium cavity (6) and the mounting cavity (7) are respectively opened on the inclined surfaces of the upper housing (1) and the lower housing (2). A sealing element (8) is provided between the upper housing (1) and the lower housing (2), and the sealing element (8) is inclined.

4. A pressure sensor according to claim 3, characterized in that, The sealing element (8) includes a sealing ring (81) and a sealing boss (82). The inner ring of the sealing boss (82) is connected to the medium cavity (6). The sealing boss is disposed on the sealing ring. A sealing groove (9) is provided on the inclined surface of the upper housing (1). A sealing ring (83) is provided on the inclined surface of the lower housing (2). Both the sealing ring (81) and the sealing boss (82) are made of elastic material. When the upper housing (1) is connected to the lower housing (2), one side of the outer surface of the sealing boss (82) abuts against the inner wall of the sealing groove (9), and the other side abuts against the pressure sensing module (71). The outer surface of the sealing ring (83) abuts against the sealing ring (81).

5. A pressure sensor according to claim 1, characterized in that, The bottom surface of the mounting cavity (7) is provided with a positioning cone (73), and the electrical signal transmission spring (72) is provided with a positioning hole (721) that slides with the positioning cone (73).

6. A pressure sensor according to claim 1, characterized in that, The lower housing (2) has multiple fixing slots (21), and the upper housing (1) has fixing posts (3) that correspond one-to-one with the fixing slots (21). The fixing posts (3) are slidably connected in the fixing slots (21), and the fixing posts (3) are provided with anti-detachment parts (4). The anti-detachment parts (4) are used to press the lower housing (2) onto the upper housing (1).

7. A pressure sensor according to claim 6, characterized in that, The anti-detachment component (4) includes a hot riveting head (41) through which a fixing post (3) extends to the lower housing (2). The fixing post (3) is made of a heat-fusible material, and the hot riveting head (41) is made by hot-melting the fixing post (3). The hot riveting head (41) abuts against the lower housing (2).

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