Pressure sensor protection device

Abstract

The invention discloses a pressure sensor protection device, and belongs to the technical field of sensors, the pressure sensor protection device comprises a sensor body, a circuit board, a pressure chip and a filter assembly, a liquid flow channel is arranged in the sensor body, the circuit board is installed in the sensor body, and the top end of the liquid flow channel is in contact with the lower surface of the circuit board; the pressure chip is installed on the lower surface of the circuit board and located at the top end of the liquid flow channel. A runner seat is arranged on one side of the sensor body; a filter screen seat is arranged at one end of the diversion column; a titanium alloy filter screen is mounted at the end part of the filter screen seat; a spiral flow guide groove is formed in the surface of the flow guide column; the spiral baffle is mounted on the spiral flow guide groove; a mounting seat is arranged at the other end of the flow guide column and is embedded into the flow channel seat, and a flow slowing cavity is formed between the mounting seat and the flow channel seat. According to the invention, oil can be filtered, and the titanium alloy filter screen is periodically self-cleaned through the piezoelectric ceramic piece, so that the detection accuracy is improved, and the service life of parts is prolonged.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sensors, and particularly relates to a pressure sensor protection device. BACKGROUND

[0002] The gearbox oil pressure sensor is a capacitive pressure sensor. When the oil pressure in the gearbox changes, the capacitance value in the pressure sensor changes, so that the oil pressure can be detected. However, after long-term use of the gearbox oil, particulate matter will be generated in the oil body. The particulate matter will cause the through hole where the pressure chip in the pressure sensor is located to be blocked, so that the detected oil pressure in the gearbox is abnormal or inaccurate. Even in the initial stage of use, high pressure impact will affect the pressure chip. It is urgent for a person skilled in the art to propose a pressure sensor protection device. SUMMARY

[0003] Therefore, the present application provides a pressure sensor protection device to solve the above problems.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0005] A pressure sensor protection device comprises a sensor body, a circuit board, a pressure chip and a filter assembly. The sensor body is provided with a liquid flow channel. The circuit board is installed in the interior of the sensor body. The top end of the liquid flow channel is in contact with the lower surface of the circuit board. The pressure chip is installed on the lower surface of the circuit board and located at the top end of the liquid flow channel. One side of the sensor body is provided with a flow channel seat. The filter assembly comprises a titanium alloy filter screen, a flow guide column and a spiral baffle. One end of the flow guide column is provided with a filter screen seat. The titanium alloy filter screen is installed at the end of the filter screen seat. The surface of the flow guide column is provided with a spiral flow guide groove. The spiral baffle is installed on the spiral flow guide groove. The other end of the flow guide column is provided with a mounting seat. The mounting seat is embedded and installed into the flow channel seat. The mounting seat and the flow channel seat form a slow flow cavity.

[0006] Further, the spiral flow guide groove and the spiral baffle form a spiral centrifugal passage. One end of the spiral centrifugal passage is in communication with the slow flow cavity, and the other end is in communication with the filter screen seat. A plurality of centrifugal separation cavities are arranged on the spiral baffle at intervals. The sidewall of the centrifugal separation cavity is provided with a one-way valve.

[0007] Further, the cross-sectional area of the spiral centrifugal passage is greater than that of the liquid flow channel.

[0008] Further, the filter assembly further comprises a cleaning assembly, the cleaning assembly comprising a positive metal bracket, a negative metal bracket and a piezoelectric ceramic sheet, one end of the positive metal bracket and the negative metal bracket being fixedly arranged in the flow channel seat respectively; a plurality of pins are arranged on the sensor body, the positive metal bracket and the negative metal bracket are electrically connected with the pins; the other end of the positive metal bracket and the negative metal bracket are electrically connected with the piezoelectric ceramic sheet; a plurality of scraping teeth are arranged on the piezoelectric ceramic sheet, and the scraping teeth abut against the lower surface of the titanium alloy filter screen.

[0009] Further, the piezoelectric ceramic sheet is in a straight plate shape, and a plurality of piezoelectric ceramic sheets are arranged in parallel with each other.

[0010] Further, the piezoelectric ceramic sheet is a plurality of circular rings with radii gradually increasing, and the plurality of piezoelectric ceramic sheets are coaxially arranged.

[0011] The beneficial effects of the present application are that:

[0012] The titanium alloy filter screen can first filter large-diameter impurity particles, and the oil liquid enters the spiral centrifugal channel, and under the action of centrifugal force, the residual impurity particles flow close to the spiral baffle and re-enter the oil liquid through the one-way valve when passing through the centrifugal separation cavity; the clean oil liquid enters the slow flow cavity to avoid the impact of high pressure directly entering the liquid flow channel on the pressure chip; the cross-sectional area of the spiral centrifugal channel is larger than that of the liquid flow channel, so that the oil liquid is not pressurized when passing through the spiral centrifugal channel, and the pressure detection result is not distorted; the periodic vibration of the piezoelectric ceramic sheet realizes the self-cleaning of the titanium alloy filter screen through the abutment of the scraping teeth and the titanium alloy filter screen, which improves the detection accuracy and the service life of the parts. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0014] Figure 1 It is a structural schematic view of a pressure sensor protection device;

[0015] Figure 2 It is a top view of a pressure sensor protection device;

[0016] Figure 3 It is Figure 2 A-A sectional view of the pressure sensor protection device;

[0017] Figure 4 is a structural schematic view of the flow guide column;

[0018] Figure 5 is a bottom view of the piezoelectric ceramic sheet of Example 1;

[0019] Figure 6 is a bottom view of the piezoelectric ceramic sheet of Example 2;

[0020] In the figure:

[0021] 10-sensor body, 11-liquid flow channel, 12-flow channel seat, 13-pin, 20-circuit board, 30-pressure chip, 41-titanium alloy filter screen, 42-flow guide column, 421-filter screen seat, 422-spiral flow guide groove, 423-mounting seat, 43-spiral baffle, 431-centrifugal separation cavity, 432-one-way valve, 441-positive electrode metal support, 442-negative electrode metal support, 443-piezoelectric ceramic sheet, 4431-scraping tooth, 50-low-flow cavity, 60-spiral centrifugal passage. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0023] Reference is made to the drawings Figures 1-6The application provides a pressure sensor protection device, which comprises a sensor body 10, a circuit board 20, a pressure chip 30 and a filter assembly. The sensor body 10 is provided with a liquid flow channel 11. The circuit board 20 is installed in the interior of the sensor body 10. The top end of the liquid flow channel 11 is in contact with the lower surface of the circuit board 20. The pressure chip 30 is installed on the lower surface of the circuit board 20 and located at the top end of the liquid flow channel 11. One side of the sensor body 10 is provided with a flow channel seat 12. The filter assembly comprises a titanium alloy filter screen 41, a flow guide column 42 and a spiral baffle 43. One end of the flow guide column 42 is provided with a filter screen seat 421. The titanium alloy filter screen 41 is installed at the end of the filter screen seat 421. The titanium alloy filter screen 41 can filter large-sized impurity particles first. The surface of the flow guide column 42 is provided with a spiral flow guide groove 422. The spiral baffle 43 is installed on the spiral flow guide groove 422. The other end of the flow guide column 42 is provided with a mounting seat 423. The mounting seat 423 is embeddedly installed into the flow channel seat 12. The mounting seat 423 and the flow channel seat 12 form a slow flow cavity 50. Clean oil enters the slow flow cavity 50, avoiding the impact of high pressure directly entering the liquid flow channel 11 on the pressure chip 30. The spiral flow guide groove 422 and the spiral baffle 43 form a spiral centrifugal passage 60. One end of the spiral centrifugal passage 60 is in communication with the slow flow cavity 50. The other end of the spiral centrifugal passage 60 is in communication with the filter screen seat 421. A plurality of centrifugal separation cavities 431 are arranged on the spiral baffle 43 at intervals. Unidirectional valves 432 are arranged on the side walls of the centrifugal separation cavities 431. The oil passing through the titanium alloy filter screen 41 flows close to the spiral baffle 43 under the action of centrifugal force and reenters the oil through the unidirectional valves 432 when passing through the centrifugal separation cavities 431. Clean oil enters the liquid flow channel 11 through the slow flow cavity 50. The pressure chip 30 is in contact with the oil to detect pressure.

[0024] The cross-sectional area of the spiral centrifugal passage 60 is larger than that of the liquid flow channel 11, avoiding the pressure increase of the oil when passing through the spiral centrifugal passage 60 and causing the distortion of the pressure detection result.

[0025] The filter assembly further comprises a cleaning assembly. The cleaning assembly comprises a positive electrode metal support 441, a negative electrode metal support 442 and a piezoelectric ceramic sheet 443. One end of the positive electrode metal support 441 and the negative electrode metal support 442 is fixedly arranged in the flow channel seat 12 respectively. A plurality of pins 13 are arranged on the sensor body 10. The positive electrode metal support 441 and the negative electrode metal support 442 are electrically connected with the pins 13. The other end of the positive electrode metal support 441 and the negative electrode metal support 442 is electrically connected with the piezoelectric ceramic sheet 443. A plurality of scraping teeth 4431 are arranged on the piezoelectric ceramic sheet 443. The scraping teeth 4431 are in abutment with the lower surface of the titanium alloy filter screen 41. The piezoelectric ceramic sheet 443 periodically vibrates. The self-cleaning of the titanium alloy filter screen 41 is realized through the abutment of the scraping teeth 4431 and the titanium alloy filter screen 41. The detection accuracy is improved. The service life of the parts is also improved.

[0026] The piezoelectric ceramic sheet 443 can have various structural forms without affecting the entry of the oil into the filter seat 421. Two embodiments of the piezoelectric ceramic sheet 443 are as follows, and the specific application is not limited to the following two structural forms.

[0027] Embodiment 1

[0028] The piezoelectric ceramic sheet 443 is in the form of a straight plate, and a plurality of piezoelectric ceramic sheets 443 are arranged in parallel.

[0029] Embodiment 2

[0030] The piezoelectric ceramic sheet 443 is in the form of a plurality of circular rings with gradually increasing radii, and the plurality of piezoelectric ceramic sheets 443 are coaxially arranged.

[0031] Working principle: The oil enters the filter seat 421 through the titanium alloy filter screen 41, and the titanium alloy filter screen 41 can first filter large-particle impurity particles, which enter the spiral centrifugal channel 60. Under the action of centrifugal force, the residual impurity particles flow close to the spiral baffle 43, pass through the one-way valve 432 when passing through the centrifugal separation cavity 431, and return to the oil, and the clean oil enters the liquid flow channel 11 through the slow-flow cavity 50. The pressure chip 30 is in contact with the oil to detect the pressure; during the process, the piezoelectric ceramic sheet 443 periodically vibrates, and the scraping teeth 4431 abuts against the titanium alloy filter screen 41 to realize self-cleaning of the titanium alloy filter screen 41, thereby improving the detection accuracy and the service life of the parts.

[0032] The above is only a specific embodiment of the present application, and the specific structure and characteristics of the scheme are not described in detail. It should be noted that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should be considered as the protection scope of the present application, and these will not affect the effect and practicality of the patent. The protection scope claimed in this application should be subject to the content of its claims, and the specific implementation mode and the like in the description can be used to explain the content of the claims.

[0033] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0034] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pressure sensor protection device, characterized in that, include: The sensor body (10), circuit board (20), pressure chip (30), and filter assembly are provided. A liquid flow channel (11) is provided in the sensor body (10). The circuit board (20) is installed inside the sensor body (10), and the top end of the liquid flow channel (11) contacts the lower surface of the circuit board (20). The pressure chip (30) is installed on the lower surface of the circuit board (20) and located at the top end of the liquid flow channel (11). A flow channel seat (12) is provided on one side of the sensor body (10). The filter assembly includes a titanium alloy filter screen (41) and a guide... The flow column (42) and the spiral baffle (43) are provided. One end of the flow column (42) is provided with a filter screen seat (421), and the titanium alloy filter screen (41) is installed at the end of the filter screen seat (421). The surface of the flow column (42) is provided with a spiral flow groove (422), and the spiral baffle (43) is installed on the spiral flow groove (422). The other end of the flow column (42) is provided with a mounting seat (423), and the mounting seat (423) is embedded in the flow channel seat (12). A slow flow cavity (50) is formed between the mounting seat (423) and the flow channel seat (12).

2. The pressure sensor protection device according to claim 1, characterized in that, The spiral guide groove (422) and the spiral baffle (43) form a spiral centrifugal channel (60). One end of the spiral centrifugal channel (60) is connected to the slow flow chamber (50), and the other end is connected to the filter screen holder (421). Multiple centrifugal separation chambers (431) are spaced apart on the spiral baffle (43), and a one-way valve (432) is provided on the side wall of the centrifugal separation chamber (431).

3. The pressure sensor protection device according to claim 2, characterized in that, The cross-sectional area of ​​the spiral centrifugal channel (60) is larger than the cross-sectional area of ​​the liquid flow channel (11).

4. The pressure sensor protection device according to claim 1, characterized in that, The filtration assembly further includes a cleaning assembly, which includes a positive metal support (441), a negative metal support (442), and a piezoelectric ceramic sheet (443). One end of the positive metal support (441) and the negative metal support (442) are respectively fixed in the flow channel seat (12). The sensor body (10) is provided with a plurality of pins (13), and the positive metal support (441) and the negative metal support (442) are electrically connected to the pins (13). The other end of the positive metal support (441) and the negative metal support (442) are both electrically connected to the piezoelectric ceramic sheet (443). The piezoelectric ceramic sheet (443) is provided with a plurality of scraping teeth (4431), and the scraping teeth (4431) abut against the lower surface of the titanium alloy filter screen (41).

5. A pressure sensor protection device according to claim 4, characterized in that, The piezoelectric ceramic sheet (443) is in the shape of a straight plate, and multiple piezoelectric ceramic sheets (443) are provided, with the multiple piezoelectric ceramic sheets (443) being parallel to each other.

6. A pressure sensor protection device according to claim 4, characterized in that, The piezoelectric ceramic sheet (443) is a plurality of rings with successively increasing radii, and the plurality of piezoelectric ceramic sheets (443) are coaxially arranged.

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