Pressure sensor multi-gas-path calibration device

Abstract

The utility model relates to the technical field of sensors, and discloses a pressure sensor multi-gas-path calibration device comprising an upper cover and a lower cover, a PCB is arranged between the upper cover and the lower cover, two sides of the upper end face of the PCB are provided with a plurality of contacts, the contacts are connected with signal lines, the contacts are wrapped by a positioning frame, and the positioning frame is connected with the PCB. A fixing cover is hinged to the positioning frame, a testing pressure head is embedded in the middle of the fixing cover, a locking assembly is arranged between the fixing cover and the positioning frame, a plurality of first grooves correspondingly matched with the positioning frame are formed in the inner end face of the upper cover, auxiliary air inlets are formed in the middles of the inner walls of the first grooves, and a main air inlet is formed in the top end of the upper cover. And the main air inlet is respectively communicated with each auxiliary air inlet. According to the utility model, the positioning frame is arranged to divide the pressure space, so that different gas channels are formed among the pressure sensors during calibration and do not influence each other, and stable supply of test gas pressure is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a multi-airway calibration device for a pressure sensor. Background Technique

[0002] During the calibration process of a pressure sensor, the pressure sensor is usually placed in a sealed pressure chamber, and the sensor signal is led out of the chamber through an electric wire and a cable connector. However, during actual use, when the pressure in the chamber is continuously increased, the cable connector also has to bear a large pressure, which may cause damage and air leakage at the cable connector, resulting in unstable pressure inside the chamber. Content of the Utility Model

[0003] The purpose of the utility model is to provide a multi-airway calibration device for a pressure sensor to solve the problems raised in the above background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A multi-airway calibration device for a pressure sensor, including an upper cover and a lower cover. A PCB board is provided between the upper cover and the lower cover. On both sides of the upper end surface of the PCB board, a plurality of contacts are provided. Signal lines are connected to the contacts, and the signal lines are printed on the PCB board. The four sides of the PCB board all extend outside the upper cover and the lower cover. The outside of the contacts is wrapped with a positioning frame. The inner diameter of the positioning frame is adapted to the pressure sensor to be measured, and a fixed cover is hinged on the positioning frame. A test pressure head is embedded in the middle of the fixed cover, and a locking component is provided between the fixed cover and the positioning frame. A plurality of grooves I corresponding to the positioning frame are opened on the inner end surface of the upper cover. An auxiliary air inlet is opened in the middle of the inner wall of the groove I. A main air inlet is provided at the top of the upper cover, and the main air inlet is communicated with each auxiliary air inlet.

[0005] In the present application solution, the following improvement is made. The locking component includes an insertion block, and the insertion block is installed on the fixed cover. A slot corresponding to the insertion block is opened at the top of the positioning frame, and a receiving cavity is provided inside the positioning frame. The slot is communicated with the receiving cavity. A guide rod is installed in the receiving cavity. A spring is sleeved outside the guide rod. One end of the spring is connected to the inner wall of the receiving cavity, and the other end is connected with a lock head. The end of the lock head away from the spring is inserted into the inside of the insertion block.

[0006] In the present application solution, the following improvement is made. One end of the guide rod of the upper cover and the lower cover is fixedly connected to the lock head, and the other end penetrates through the positioning frame and extends outwards and is connected with a pull ring. Pull the pull ring outwards, compress the spring to receive the lock head into the receiving cavity, then align the insertion block with the slot, insert the insertion block downwards. When the insertion block completely enters the slot, release the pull ring, and under the elastic force of the spring, the lock head is inserted into the inside of the insertion block, completing the fixation of the fixed cover and the positioning frame and the pressing of the test pressure head against the pressure sensor to be measured.

[0007] The following improvements are made in the solution of this application. The fixed cover is hinged to the side of the positioning frame. A second groove is provided at the top end of the positioning frame, and a sealing ring corresponding to and cooperating with the second groove is provided on the inner end face of the fixed cover.

[0008] The following improvements are made in the solution of this application. Sealing gaskets are provided between the upper cover and the PCB board and between the lower cover and the PCB board.

[0009] The following improvements are made in the solution of this application. A third groove is provided in the middle of the inner end face of the lower cover. Positioning posts are provided at the inner corners of the third groove. A circle of lower threaded holes is equidistantly provided at the edge of the lower cover outside the third groove. Upper bolt holes matching the lower threaded holes are provided on the upper cover. Through holes corresponding to and cooperating with the lower threaded holes are provided on both the PCB board and the sealing gasket.

[0010] Compared with the prior art, the present utility model provides a pressure sensor multi-air path calibration device, which has the following beneficial effects:

[0011] The present utility model divides the pressure space by setting a positioning frame, and through the cooperative setting between the main air inlet, the auxiliary air inlet and the test probe, different air path channels are formed between different pressure sensors during calibration, without affecting each other, ensuring the stable supply of the test air pressure. During use, first place the pressure sensor to be tested in each positioning frame, so that it forms a connection with the signal line through the contact to realize signal transmission. Then, cooperate with the fixed cover and the locking component to press the test probe tightly on the pressure sensor to be tested. The gas enters through the main air inlet, is dispersed to each auxiliary air inlet and enters the first groove to act on the test probe, and the test probe applies pressure to the pressure sensor to be tested. The test pressure signal of the pressure sensor to be tested is collected through the contact and the signal line provided on the PCB board. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is an exploded view of the present utility model;

[0013] Figure 2 is a plan view of the PCB board;;

[0014] Figure 3 is a plan view of the upper cover;

[0015] Figure 4 is a cross-sectional view of the positioning frame and the fixed cover;

[0016] Figure 5 is Figure 3 an enlarged view of part A in

[0017] In the figure: 1. Upper cover; 11. First groove; 12. Auxiliary air inlet; 13. Main air inlet; 14. Upper bolt hole; 2. Lower cover; 21. Third groove; 22. Positioning post; 23. Lower threaded hole; 3. PCB board; 31. Contact; 32. Signal line; 4. Positioning frame; 41. Slot; 42. Accommodating cavity; 43. Guide rod; 431. Pull ring; Test pressure head; 52. Insert block; 53. Sealing ring; 44. Spring; 45. Lock head; 46. Second groove; 5. Fixed cover; 51. Test pressure head. Specific implementation manner

[0018] The following will describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention:

[0019] As Figures 1-5 shown, a multi-airway calibration device for a pressure sensor mainly consists of an upper cover 1, a lower cover 2, and a PCB board 3. Among them, sealing gaskets 6 are provided between the upper cover 1 and the PCB board 3, and between the lower cover 2 and the PCB board 3. A third groove 21 is opened in the middle of the inner end face of the lower cover 2. A positioning post 22 is provided at the inner corner of the third groove 21. And a circle of lower threaded holes 23 are equidistantly opened at the edge of the lower cover 2 outside the third groove 21. Upper bolt holes 14 matching the lower threaded holes 23 are opened on the upper cover 1. Through holes corresponding to and matching the lower threaded holes 23 are opened on both the PCB board 3 and the sealing gasket 6. The PCB board 3 is located between the upper cover 1 and the lower cover 2. Eight contacts 31 are provided on both sides of the upper end face of the PCB board 3. And signal lines 32 are connected to the contacts 31. The signal lines 32 are printed on the PCB board 3. The eight signal lines 32 are concentrated at the signal processor at the center position of the PCB board 3 away from the contacts 31. The periphery of the PCB board 3 extends outside the upper cover 1 and the lower cover 2. And a connector is provided at the edge of the PCB board 3 between the two side contacts 31.

[0020] The contacts 31 are externally wrapped with a positioning frame 4. The inner diameter of the positioning frame 4 is adapted to the pressure sensor to be measured. And a fixed cover 5 is hinged on the positioning frame 4. A test pressure head 51 is embedded in the middle of the fixed cover 5. And a locking assembly is provided between the fixed cover 5 and the positioning frame 4. Multiple first grooves 11 corresponding to and matching the positioning frame 4 are opened on the inner end face of the upper cover 1. An auxiliary air inlet 12 is opened in the middle of the inner wall of the first groove 11. A main air inlet 13 is provided at the top of the upper cover 1. The main air inlet 13 is respectively communicated with each auxiliary air inlet 12.

[0021] The locking component includes an insertion block 52. A slot 41 corresponding to and cooperating with the insertion block 52 is formed at the top of the positioning frame 4. And a receiving cavity 42 is provided inside the positioning frame 4. The slot 41 communicates with the receiving cavity 42. A guide rod 43 is installed in the receiving cavity 42. A spring 44 is sleeved outside the guide rod 43. One end of the spring 44 is connected to the inner wall of the receiving cavity 42, and the other end is connected to a lock head 45. The end of the lock head 45 away from the spring 44 is inserted into the inside of the insertion block 52. One end of the guide rod 43 of the upper cover 1 and the lower cover 2 is fixedly connected to the lock head 45, and the other end penetrates through the positioning frame 4 and extends outward and is connected to a pull ring 431. The fixed cover 5 is hinged to the side of the positioning frame 4. A second groove 46 is formed at the top of the positioning frame 4. A sealing ring 53 corresponding to and cooperating with the second groove 46 is provided on the inner end face of the fixed cover 5.

[0022] The above embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

Claims

1. A multi-air circuit calibration device for a pressure sensor, characterized in that: It includes an upper cover (1) and a lower cover (2). A PCB board (3) is provided between the upper cover (1) and the lower cover (2). On both sides of the upper end face of the PCB board (3), a plurality of contacts (31) are provided. Signal lines (32) are connected to the contacts (31). The signal lines (32) are printed on the PCB board (3). The four sides of the PCB board (3) all extend outside the upper cover (1) and the lower cover (2). The outside of the contact (31) is wrapped with a positioning frame (4). The inner diameter of the positioning frame (4) is adapted to the pressure sensor to be measured. And a fixed cover (5) is hinged on the positioning frame (4). A test pressure head (51) is embedded in the middle of the fixed cover (5). And a locking component is provided between the fixed cover (5) and the positioning frame (4). On the inner end face of the upper cover (1), a plurality of grooves one (11) corresponding to and cooperating with the positioning frame (4) are opened. In the middle of the inner wall of the groove one (11), an auxiliary air inlet (12) is opened. On the top of the upper cover (1), a main air inlet (13) is provided. The main air inlet (13) is respectively communicated with each auxiliary air inlet (12).

2. The multi-air circuit calibration device for a pressure sensor according to claim 1, wherein: The locking component includes an insertion block (52). On the top of the positioning frame (4), a slot (41) corresponding to and cooperating with the insertion block (52) is opened. And a receiving cavity (42) is provided in the positioning frame (4). The slot (41) is communicated with the receiving cavity (42). A guide rod (43) is installed in the receiving cavity (42). A spring (44) is sleeved outside the guide rod (43). One end of the spring (44) is connected to the inner wall of the receiving cavity (42), and the other end is connected with a lock head (45). The end of the lock head (45) away from the spring (44) is inserted into the inside of the insertion block (52).

3. The multi-airway calibration device for a pressure sensor according to claim 2, characterized in that: One end of the guide rod (43) is fixedly connected to the lock head (45), and the other end penetrates through the positioning frame (4) and extends outward and is connected with a pull ring (431).

4. A multi-airway calibration device for a pressure sensor according to claim 3, characterized in that: The fixed cover (5) is hinged to the side of the positioning frame (4). On the top of the positioning frame (4), a groove two (46) is opened. On the inner end face of the fixed cover (5), a sealing ring (53) corresponding to and cooperating with the groove two (46) is provided.

5. The multi-gas-path calibration device for a pressure sensor according to claim 1, characterized in that: Sealing gaskets (6) are provided between the upper cover (1) and the PCB board (3) and between the lower cover (2) and the PCB board (3).

6. The multi-airway calibration device for a pressure sensor according to claim 5, wherein: In the middle of the inner end face of the lower cover (2), a groove three (21) is opened. Positioning columns (22) are provided at the inner corners of the groove three (21). At the edge of the lower cover (2) outside the groove three (21), a circle of lower threaded holes (23) are equally spaced. On the upper cover (1), upper bolt holes (14) cooperating with the lower threaded holes (23) are opened. Through holes corresponding to and cooperating with the lower threaded holes (23) are opened on both the PCB board (3) and the sealing gasket (6).

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