Double-die differential pressure sensor

Abstract

The utility model relates to the field of sensors, in particular to a double-die differential pressure sensor which comprises a shell, an electrical connector is arranged on the shell, a pressure measuring notch is formed in one side of the shell, a plugging block is arranged at the opening end of the pressure measuring notch, and a pressure measuring module used for measuring pressure is arranged on the side, facing the pressure measuring notch, of the plugging block. The plugging block is connected with a first air inlet pipe and a second air inlet pipe, the first air inlet pipe and the second air inlet pipe are both communicated with the side, facing the pressure measuring module, of the plugging block, and sealing pieces are arranged in the shell and used for achieving the sealing effect between the pressure measuring module and the shell and between the pressure measuring module and the plugging block. The device has the effects of simultaneously measuring the gas pressure value and the pressure difference and being stable and firm in structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sensors, in particular to a dual-mode differential pressure sensor. BACKGROUND

[0002] A differential pressure sensor is a sensor used to measure the pressure difference between the front and back of a device or component. In the automotive field, in order to meet emission standards, the common method is to install a particulate trap in the exhaust emission part of the car to capture particulate matter emitted in the exhaust. However, the exhaust emission channel will be gradually blocked with the accumulation of trapped particles. The method to remove these accumulated particles is to increase the temperature of the exhaust gas to promote the catalytic reaction, thereby causing the accumulated particles to burn and vaporize. This cleaning process is called the "regeneration" process. A differential pressure sensor is installed at both ends of the particulate trap to measure the pressure difference between the inlet and outlet.

[0003] A differential pressure sensor is disclosed in Chinese Patent No. CN115507997A, which includes a housing, the inner cavity of the housing is divided into a high-pressure cavity and a first cavity by a side plate and an inclined partition plate, the first cavity includes a pressure core assembly installation cavity and a low-pressure cavity connected in communication, the edges of the openings corresponding to the left and right sides of the low-pressure cavity of the main housing are recessed to form a second flange, the second side cover includes a second side cover body, the edges of the second side cover body protrude towards one side of the main housing to form a second flange inserted into the second sealing groove, the front and rear middle parts of the second side cover body protrude towards one side of the main housing to form a second partition rib inserted into the second partition groove, and the second partition groove formed between the two side partition plates is sealed by the adhesion of the second sealing glue between the second partition rib and the side cover two.

[0004] The above-mentioned technology realizes the sealing and fixing effect between the second partition groove and the second partition rib of the side cover two through the sealing glue. However, the sensor is usually used on the vehicle body, and as the service life of the sensor increases, the sealing glue will age and peel off. During the driving process of the vehicle body, the vehicle body will vibrate continuously due to uneven road surface, and the vibration of the vehicle body will be transmitted to the sensor, causing the side cover to separate from the main housing, so that the internal parts of the sensor lose the sealing and fixing effect, and the sensor is damaged and fails, which has the problem of deficiency. CONTENT OF THE UTILITY MODEL

[0005] In order to improve the problem that the aging of the sealing glue easily causes the sensor to be damaged and fail, the present application provides a dual-mode differential pressure sensor.

[0006] The dual-mode differential pressure sensor provided by the present application adopts the following technical scheme:

[0007] The utility model provides a kind of dual-mode differential pressure sensor, including shell, which is provided with electrical connector, one side of the shell is provided with pressure measuring slot, the opening end of the pressure measuring slot is provided with blocking piece, the side of the blocking piece towards the pressure measuring slot is provided with pressure measuring module for measuring pressure, the first air inlet pipe and the second air inlet pipe are connected on the blocking piece, the first air inlet pipe and the second air inlet pipe are communicated with the side of the blocking piece towards the pressure measuring module, the sealing element is provided in the shell, and the sealing function between the pressure measuring module and the shell, the pressure measuring module and the blocking piece is realized.

[0008] By adopting the above technical scheme, the test personnel respectively communicate the two ends of the device to be tested with the first air inlet pipe and the second air inlet pipe, and the first air inlet pipe and the second air inlet pipe transmit the gas pressure to the pressure measuring module. In this process, the sealing element realizes the sealing effect of the inflowing gas, and the pressure measuring module converts the gas pressure values corresponding to the first air inlet pipe and the second air inlet pipe into electrical signals and transmits them to the external device through the electrical connector, so as to facilitate the test personnel to obtain the gas pressure value.

[0009] Optionally, the pressure measuring module includes a circuit board disposed on the blocking piece, the circuit board is provided with a first sensing sheet and a second sensing sheet, the first sensing sheet is located between the circuit board and the first air inlet pipe, the second sensing sheet is located between the circuit board and the second air inlet pipe, the first sensing sheet and the second sensing sheet are electrically connected to the circuit board, the shell is provided with a signal transmission spring piece electrically connected to the electrical connector, and the end of the signal transmission spring piece away from the shell is used to be electrically connected to the circuit board.

[0010] By adopting the above technical scheme, the gas pressure of the first air inlet pipe is fed back to the circuit board by the first sensing sheet, and the gas pressure of the second air inlet pipe is fed back to the circuit board by the second sensing sheet. The circuit board transmits the pressure difference between the first air inlet pipe and the second air inlet pipe to the electrical connector in the form of electrical signal through the signal transmission spring piece, so as to facilitate the test personnel to obtain the pressure difference in time.

[0011] Optionally, the sealing element includes a sealing ring, a first sealing ring and a second sealing ring, the sealing ring is arranged between the circuit board and the shell, the sealing groove for accommodating the sealing ring is arranged in the pressure measuring slot of the shell, and the first sealing ring and the second sealing ring are arranged between the circuit board and the blocking piece.

[0012] By adopting the above technical scheme, the possibility of gas overflow in the first air inlet pipe and the second air inlet pipe is reduced, and the sealing property of the internal parts of the sensor is improved, which is conducive to improving the accuracy of the measured gas pressure measurement result.

[0013] Optionally, a fixing member is arranged between the shell and the blocking block, and the fixing member is used for fixing the blocking block on the shell.

[0014] By using the above technical scheme, when the assemblers install the blocking block at the pressure measuring slot of the shell, the sealing ring, the first sealing ring and the second sealing ring are all deformed by being extruded. Then, the assemblers insert the plug block into the first slot. With the continuous insertion of the plug block, the plug block is gradually inserted into the second slot on the blocking block. The plug block is locked by the friction force. Meanwhile, under the restoring deformation force of the sealing ring, the first sealing ring and the second sealing ring, the blocking block has a shearing force to push the plug block, so that the plug block is pressed on the first slot, thereby reducing the possibility of the plug block being separated from the blocking block.

[0015] Optionally, an installation slot is arranged at one end of the plug block away from the blocking block.

[0016] By using the above technical scheme, the assemblers can conveniently install or dismount the plug block through the installation slot.

[0017] In summary, the present application has at least one of the following beneficial technical effects:

[0018] 1. The testers respectively connect the two ends of the equipment to be tested to the first air inlet pipe and the second air inlet pipe. The first air inlet pipe and the second air inlet pipe transmit the gas pressure to the pressure measuring module. In this process, the sealing member seals the inflowing gas. Meanwhile, the pressure measuring module converts the gas pressure values corresponding to the first air inlet pipe and the second air inlet pipe into electrical signals, and transmits the electrical signals to the external equipment through the electrical connector, so as to facilitate the testers to obtain the gas pressure value.

[0019] 2. The possibility of gas overflow in the first air inlet pipe and the second air inlet pipe is reduced, and the sealing performance of the internal parts of the sensor is improved, which is beneficial to improve the accuracy of the measurement result of the measured gas pressure.

[0020] 3. When the assemblers install the blocking block at the pressure measuring slot of the shell, the sealing ring, the first sealing ring and the second sealing ring are all deformed by being extruded. Then, the assemblers insert the plug block into the first slot. With the continuous insertion of the plug block, the plug block is gradually inserted into the second slot on the blocking block. The plug block is locked by the friction force. Meanwhile, under the restoring deformation force of the sealing ring, the first sealing ring and the second sealing ring, the blocking block has a shearing force to push the plug block, so that the plug block is pressed on the first slot, thereby reducing the possibility of the plug block being separated from the blocking block. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of an embodiment of the present application.

[0022] Figure 2 is an exploded structural schematic diagram of an embodiment of the present application.

[0023] Figure 3 is a sectional view of the positional relationship of a housing, a circuit board and a sealing ring in an embodiment of the present application.

[0024] Figure 4 is a sectional view of the positional relationship of a plugging block, an insertion block and a housing in an embodiment of the present application.

[0025] Reference Signs: 1, housing; 2, electrical connector; 3, pressure measuring notch; 4, plugging block; 5, pressure measuring module; 51, circuit board; 52, first measuring notch; 53, second measuring notch; 54, first sensing sheet; 55, second sensing sheet; 56, signal transmission spring; 6, first air inlet pipe; 7, second air inlet pipe; 8, sealing member; 81, sealing ring; 82, sealing notch; 83, first sealing ring; 84, second sealing ring; 9, fixing member; 91, insertion block; 92, first insertion slot; 93, second insertion slot; 10, mounting notch. DETAILED DESCRIPTION

[0026] The following will be described in detail below with reference to the accompanying drawings. Figures 1-4 The present application will be further described in detail.

[0027] An embodiment of the present application discloses a dual-mode differential pressure sensor.

[0028] Reference will be made to Figure 1 A dual-mode differential pressure sensor comprises a housing 1, which can be made of plastic material, and an electrical connector 2 integrally formed on the housing 1. A pressure measuring notch 3 is formed on one side of the housing 1, and a plugging block 4 is arranged at the opening end of the pressure measuring notch 3. A fixing member 9 is arranged between the housing 1 and the plugging block 4, and is used to fix the plugging block 4 on the housing 1.

[0029] Reference will be made to Figure 1 , Figure 2 and Figure 3 The fixing member 9 comprises an insertion block 91 inserted into the housing 1. The housing 1 is provided with a first insertion slot 92 for inserting the insertion block 91. The insertion direction of the insertion block 91 is perpendicular to the insertion direction of the plugging block 4. The plugging block 4 is provided with a second insertion slot 93 for inserting the insertion block 91. The insertion block 91 is provided with a mounting notch 10 at one end away from the plugging block 4. The housing 1 and the plugging block 4 can also be fixed by ultrasonic welding.

[0030] Reference will be made to Figure 2 , Figure 3 and Figure 4, the side of the blocking block 4 facing the pressure measuring notch 3 is provided with a pressure measuring module 5 for measuring pressure, the first air inlet pipe 6 and the second air inlet pipe 7 are integrally formed on the blocking block 4, and the first air inlet pipe 6 and the second air inlet pipe 7 are both in communication with the side of the blocking block 4 facing the pressure measuring module 5, and the sealing element 8 is arranged in the shell 1 and is used to realize the sealing effect between the pressure measuring module 5 and the shell 1 and between the pressure measuring module 5 and the blocking block 4.

[0031] With reference to Figure 2 , Figure 3 and Figure 4 , the pressure measuring module 5 comprises a circuit board 51 arranged on the blocking block 4, the first measuring notch 52 and the second measuring notch 53 are formed on the circuit board 51, the first sensing sheet 54 is arranged at the first measuring notch 52 of the circuit board 51, and the first sensing sheet 54 is located between the circuit board 51 and the first air inlet pipe 6.

[0032] With reference to Figure 2 , Figure 3 and Figure 4 , the second sensing sheet 55 is arranged at the second measuring notch 53 of the circuit board 51, the second sensing sheet 55 is located between the circuit board 51 and the second air inlet pipe 7, the first sensing sheet 54 and the second sensing sheet 55 are both electrically connected to the circuit board 51, the signal transmission spring 56 electrically connected to the electrical connector 2 is arranged on the shell 1, and the end of the signal transmission spring 56 away from the shell 1 is used to be electrically connected to the circuit board 51.

[0033] With reference to Figure 2 , Figure 3 and Figure 4 , the sealing element 8 comprises a sealing ring 81, a first sealing ring 83 and a second sealing ring 84, the sealing ring 81 is arranged between the circuit board 51 and the shell 1, the sealing groove 82 for accommodating the sealing ring 81 is formed on the inner wall of the pressure measuring notch 3 of the shell 1, the first sealing ring 83 and the second sealing ring 84 are arranged between the circuit board 51 and the blocking block 4, the first air inlet pipe 6 is located in the ring of the first sealing ring 83 at the joint with the pressure measuring notch 3, and the second air inlet pipe 7 is located in the ring of the second sealing ring 84 at the joint with the pressure measuring notch 3.

[0034] When the assembly personnel inserts the blocking block 4 into the pressure measuring notch 3 on the shell 1, the blocking block 4 drives the circuit board 51 to gradually approach the signal transmission spring 56 on the shell 1, until the top of the circuit board 51 contacts the sealing ring 81, and with the continuous insertion of the blocking block 4, the sealing ring 81, the first sealing ring 83 and the second sealing ring 84 are all extruded to deform, and at the same time, the signal transmission spring 56 is extruded to deform and contact the contact on the circuit board 51.

[0035] Until the first slot 92 and the second slot 93 are communicated and aligned, then the assembler inserts the plug 91, the plug 91 is inserted into the second slot 93 on the blocking block 4 from the first slot 92 on the shell 1, and the blocking block 4 is fixed on the shell 1 through the friction between the plug 91 and the first slot 92 and the second slot 93.

[0036] Then the plastic of the shell 1 is hot-pressed and deformed into the mounting notch 10, preventing the plug 91 from being pulled outwards, and when the assembler releases the blocking block 4, the restoring deformation force of the sealing ring 81, the first sealing ring 83 and the second sealing ring 84 pushes the blocking block 4 to press the plug 91 on the first slot 92, thereby realizing the function of fixing the blocking block 4 on the shell 1.

[0037] The tester connects the two ends of the device to be tested to the first gas inlet pipe 6 and the second gas inlet pipe 7 respectively, the first gas inlet pipe 6 and the second gas inlet pipe 7 transmit the gas pressure to the first sensing sheet 54 and the second sensing sheet 55, the first sensing sheet 54 and the second sensing sheet 55 feed the gas pressure difference to the circuit board 51 in the form of an electrical signal, and the circuit board 51 transmits the signal to the electrical connector 2 through the signal transmission spring 56.

[0038] The implementation principle of the embodiment of the application is that when the assembler inserts the blocking block 4 into the pressure measuring notch 3 on the shell 1, the blocking block 4 drives the circuit board 51 to gradually approach the signal transmission spring 56 on the shell 1, until the top of the circuit board 51 contacts the sealing ring 81, and as the blocking block 4 continues to be inserted, the sealing ring 81, the first sealing ring 83 and the second sealing ring 84 are all deformed by being pressed, and at the same time, the signal transmission spring 56 is deformed by being pressed and contacts the contact on the circuit board 51.

[0039] Until the first slot 92 and the second slot 93 are communicated and aligned, then the assembler inserts the plug 91, the plug 91 is inserted into the second slot 93 on the blocking block 4 from the first slot 92 on the shell 1, and the blocking block 4 is fixed on the shell 1 through the friction between the plug 91 and the first slot 92 and the second slot 93.

[0040] Then the plastic of the shell 1 is hot-pressed and deformed into the mounting notch 10, preventing the plug 91 from being pulled outwards, and when the assembler releases the blocking block 4, the restoring deformation force of the sealing ring 81, the first sealing ring 83 and the second sealing ring 84 pushes the blocking block 4 to press the plug 91 on the first slot 92, thereby realizing the function of fixing the blocking block 4 on the shell 1.

[0041] The tester connects the two ends of the device under test to the first gas inlet pipe 6 and the second gas inlet pipe 7 respectively, the first gas inlet pipe 6 and the second gas inlet pipe 7 transmit the gas pressure to the first sensing sheet 54 and the second sensing sheet 55, the first sensing sheet 54 and the second sensing sheet 55 feed back the gas pressure difference to the circuit board 51 in the form of an electric signal, and the circuit board 51 transmits the signal to the electrical connector 2 through the signal transmission spring 56.

[0042] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A dual mode differential pressure sensor characterized by: The utility model provides a pressure measuring device, including shell (1), be provided with electrical joint (2) on shell (1), one side of shell (1) is provided with pressure measuring slot (3), the opening end of pressure measuring slot (3) is provided with the obturator (4), the obturator (4) is provided with pressure measuring module (5) for measuring pressure towards one side of pressure measuring slot (3), the first air inlet pipe (6) and the second air inlet pipe (7) are connected on the obturator (4), the first air inlet pipe (6) and the second air inlet pipe (7) all with obturator (4) side of towards pressure measuring module (5) intercommunication, the sealing element (8) is provided in shell (1), and the sealing effect between pressure measuring module (5) and shell (1), pressure measuring module (5) and obturator (4) is realized to sealing element (8).

2. A dual mode differential pressure sensor according to claim 1, wherein: The pressure measuring module (5) includes the circuit board (51) set up on the obturator (4), the first inductive sheet (54) and the second inductive sheet (55) are provided on the circuit board (51), the first inductive sheet (54) is located between the circuit board (51) and the first air inlet pipe (6), the second inductive sheet (55) is located between the circuit board (51) and the second air inlet pipe (7), the first inductive sheet (54) and the second inductive sheet (55) are electrically connected to the circuit board (51), the signal transmission spring (56) electrically connected with the electrical joint (2) is provided on the shell (1), and the one end of signal transmission spring (56) is used for being electrically connected with the circuit board (51) back to the shell (1).

3. A dual mode differential pressure sensor according to claim 2, wherein: The sealing element (8) includes sealing ring (81), first sealing ring (83) and second sealing ring (84), the sealing ring (81) is arranged between the circuit board (51) and the shell (1), the sealing slot (82) for accommodating the sealing ring (81) is formed in the pressure measuring slot (3) of the shell (1), and the first sealing ring (83) and the second sealing ring (84) are arranged between the circuit board (51) and the obturator (4).

4. A dual mode differential pressure sensor according to claim 1, wherein: The fixing part (9) is arranged between the shell (1) and the obturator (4), and the fixing part (9) is used for fixing the obturator (4) on the shell (1), the fixing part (9) includes the plug (91) detachably arranged on the shell (1), the first insertion groove (92) is formed in the shell (1) for inserting the plug (91), and the second insertion groove (93) is formed in the obturator (4) for inserting the plug (91).

5. A dual mode differential pressure sensor according to claim 4, wherein: The mounting slot (10) is formed in the one end of the plug (91) away from the obturator (4).

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