Multi-channel miniature pressure scanning valve

Abstract

A detachable top cover and a detachable bottom cover are arranged at the top and the bottom of a middle frame respectively, a concave cavity is formed in the middle frame, a sensor assembly is installed on the top of the concave cavity, a plurality of air guide pipes are arranged on the top cover, and the air guide pipes, vent holes in the top of the middle frame and the sensor assembly are sequentially communicated. Therefore, multi-channel pressure monitoring of the sensor assembly is realized. The main control circuit board is arranged on the bottom cover and is connected with the sensor assembly through a cable; and the electrical connector is arranged at the top of the middle frame and is respectively connected with the main control circuit board and an external power supply through cables. The multi-channel pressure sensor has the characteristics of compact structure, small size, high measurement precision and the like, and can well meet the multi-channel pressure measurement requirements of wide temperature range, small size, light weight, autonomous controllability, high measurement precision and high cost performance.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-channel pressure measurement of aerospace vehicles and engines thereof, in particular to a multi-channel micro pressure scanning valve. Background Art

[0002] Since the pressure scanning valve has the advantages of small size, easy installation, high system integration, and fast scanning rate, it can better meet the multi-channel and high-accuracy pressure testing requirements in aircraft flight tests and engine test runs. The pressure scanning valve uses multi-channel sensors to measure and collect data at multiple points, and uses a digital-to-analog conversion system and a microprocessor to process the data.

[0003] Taking into account the integration degree, stability, measurement accuracy and other indicators of pressure scanning valves, many domestic manufacturers still mainly use imported products. However, foreign products have many problems such as narrow operating temperature range, high price, long maintenance cycle, embargo, and non-autonomous control of products. In view of this, it is urgent to realize a pressure scanning valve with a wide temperature range, small size, light weight, autonomous control, high measurement accuracy and high cost performance to meet the production needs of domestic manufacturers. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in view of the above problems in the prior art, a multi-channel micro pressure scanning valve with compact structure, small size, wide temperature range and high measurement accuracy is provided.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A multi-channel micro pressure scanning valve comprises: a top cover, a middle frame, a bottom cover, a main control circuit board, an electrical connector and a sensor assembly; the top and bottom of the middle frame are respectively installed with a detachable top cover and a detachable bottom cover, the top of the middle frame is provided with a plurality of vents, a concave cavity is provided inside the middle frame, the sensor assembly is installed at the top of the concave cavity, the top cover is provided with a plurality of air ducts corresponding to the vents one by one, the air ducts, the vents and the sensor assembly are connected in sequence to realize multi-channel pressure monitoring by the sensor assembly; the main control circuit board is installed on the bottom cover and is located at the bottom of the concave cavity, the main control circuit board is connected to the sensor assembly through a cable to control the operation of the pressure scanning valve; the electrical connector is installed on the top of the middle frame, and the electrical connector is respectively connected to the main control circuit board and an external power supply through cables to realize power supply of the pressure scanning valve.

[0007] As a further improvement of the utility model, the sensor assembly includes a conditioning circuit board, a rubber plate and a pressure plate, a rubber plate is provided between the conditioning circuit board and the pressure plate, and the conditioning circuit board and the middle frame are sealed with glue; a plurality of miniature pressure sensors are provided on the conditioning circuit board, and the miniature pressure sensors correspond one-to-one to the vents to realize multi-channel pressure measurement.

[0008] As a further improvement of the utility model, the middle frame is provided with a plurality of second threaded holes, the conditioning circuit board is provided with a plurality of third positioning holes, the rubber plate is provided with a plurality of fourth positioning holes, and the pressure plate is provided with a plurality of fifth positioning holes. The third fastener is screwed into the fifth positioning hole, the fourth positioning hole, the third positioning hole and the second threaded hole in sequence to achieve fixed connection of the conditioning circuit board, the rubber plate and the pressure plate to the top of the concave cavity of the middle frame.

[0009] As a further improvement of the utility model, the top cover is provided with a plurality of first positioning holes, the middle frame is provided with a plurality of first threaded holes, and the first fasteners are screwed into the first positioning holes and the first threaded holes to achieve fixed connection of the top cover to the top of the middle frame.

[0010] As a further improvement of the utility model, a plurality of annular grooves are provided on the outer side of the top of the middle frame, and the annular grooves correspond to the vents one by one. A sealing ring is provided in the annular groove to achieve a sealed connection between the vents and the air duct.

[0011] As a further improvement of the present invention, a plurality of circular cavities are provided on the inner side of the top of the middle frame, the circular cavities are connected to the vent holes, and the micro pressure sensors are located in the circular cavities.

[0012] As a further improvement of the utility model, strip grooves are provided all around the circular cavity, and slot holes penetrating the top of the middle frame are provided at the intersections of adjacent strip grooves; when the conditioning circuit board is installed and fixed, sealant is poured through the slot holes so that the sealant fills the strip grooves, so that each micro pressure sensor is independently sealed in the grid composed of the strip grooves.

[0013] As a further improvement of the present invention, the middle frame is provided with a plurality of third threaded holes, and the bottom cover is provided with a plurality of second positioning holes, and the second fasteners are screwed into the second positioning holes and the third threaded holes to achieve connection and fixation between the middle frame and the bottom cover.

[0014] As a further improvement of the utility model, a mounting hole is provided on one side of the top of the middle frame, and the mounting hole is used to install an electrical connector; mounting ears with holes are provided at the four corners of the middle frame, and through holes corresponding to the mounting ears are provided on the bottom cover to realize the installation and fixation of the pressure scanning valve.

[0015] As a further improvement of the utility model, the bottom cover is provided with a plurality of threaded hole bosses, and the main control circuit board is provided with a plurality of sixth positioning holes, and the second fasteners are screwed into the sixth positioning holes and the threaded hole bosses to achieve connection and fixation between the main control circuit board and the bottom cover.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] The multi-channel micro pressure scanning valve of the utility model is convenient for installing the pressure scanning valve inside the engine of an aerospace vehicle by installing detachable top cover and bottom cover on the top and bottom of the middle frame respectively, so as to facilitate more accurate measurement of the pressure changes inside the engine; a plurality of air vents are provided on the top of the middle frame, a concave cavity is provided inside the middle frame, the sensor assembly is installed on the top of the concave cavity, a plurality of air ducts corresponding to the air vents are provided on the top cover, the air ducts, the air vents and the sensor assembly are connected in sequence, so that the sensor assembly performs multi-channel pressure monitoring; at the same time, the main control circuit board is installed on the bottom cover, the electrical connector is installed on the top of the middle frame, the sensor assembly and the electrical connector are connected to the main control circuit board through cables, so that the circuit connection is realized, and the reliable operation of the sensor assembly is ensured, and multi-channel pressure measurement with a wide temperature range, small size, light weight, autonomous control, high measurement accuracy and high cost performance can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure principle of a multi-channel micro pressure scanning valve in a specific embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure principle of a multi-channel micro pressure scanning valve in a specific embodiment of the utility model;

[0020] Figure 3 for Figure 2 Schematic diagram of the structural principle at A in the middle;

[0021] Figure 4 This is a schematic diagram of the assembly principle of the sensor conditioning circuit board in a specific embodiment of the utility model;

[0022] Figure 5 This is a schematic diagram of the bottom structure principle of a multi-channel micro pressure scanning valve in a specific embodiment of the utility model;

[0023] Figure 6 This is a schematic diagram of the structural principle of the top cover in a specific embodiment of the utility model;

[0024] Figure 7 This is a schematic diagram of the structural principle of the middle frame in a specific embodiment of the utility model;

[0025] Figure 8It is a schematic diagram of the structural principle of the middle frame from another perspective in a specific embodiment of the utility model;

[0026] Fig. 9 This is a schematic diagram of the structural principle of the bottom cover in a specific embodiment of the utility model;

[0027] Fig.10 This is a schematic diagram of the structural principle of the sensor conditioning circuit board in a specific embodiment of the utility model;

[0028] Fig.11 This is a schematic diagram of the structural principle of the rubber plate in a specific embodiment of the utility model;

[0029] Fig.12 This is a schematic diagram of the structural principle of the pressing plate in a specific embodiment of the utility model;

[0030] Fig.13 This is a schematic diagram of the structural principle of the main control circuit board in a specific embodiment of the utility model;

[0031] Fig.14 Schematic diagram of the structural principle of a multi-channel micro pressure scanning valve in a specific embodiment of the utility model; wherein Figure (a) is a top view and Figure (b) is a side view.

[0032] Legend: 1. Top cover; 101. First positioning hole; 102. Air duct; 103. First fastener; 2. Middle frame; 201. Mounting ear; 202. Annular groove; 203. Slot hole; 204. First threaded hole; 205. Mounting hole; 206. Strip groove; 207. Second threaded hole; 208. Third threaded hole; 209. Circular cavity; 210. Vent; 3. Bottom cover; 301. Threaded hole boss; 302. Second positioning hole; 303. Through hole; 304. Second fastener; 4. Conditioning circuit board; 401. Micro pressure sensor; 402. Third positioning hole; 5. Rubber board; 501. Fourth positioning hole; 6. Press plate; 601. Fifth positioning hole; 602. Third fastener; 7. Main control circuit board; 701. Sixth positioning hole; 8. Electrical connector; 9. Sealing ring. DETAILED DESCRIPTION

[0033] The following describes the embodiments of the present invention in detail, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. Figures 1 to 14 The described embodiments are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "inlay" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Example

[0038] like Figures 1 to 13 As shown, the multi-channel micro pressure scanning valve of the utility model comprises: a top cover 1, a middle frame 2, a bottom cover 3, a main control circuit board 7, an electrical connector 8 and a sensor assembly. The top and bottom of the middle frame 2 are respectively installed with a removable top cover 1 and a bottom cover 3. The top of the middle frame 2 is provided with a plurality of vents 210, and the top cover 1 is sealed and covers the vents 210; a concave cavity is provided inside the middle frame 2, and the sensor assembly is installed on the top of the concave cavity. The top cover 1 is provided with a plurality of air ducts 102 corresponding to the vents 210 one by one. When the pressure scanning valve is assembled, the air ducts 102, the vents 210 and the sensor assembly are connected in sequence, and the air flow in the engine passes from the air ducts 102 through the vents 210 to the sensor assembly, so as to realize the multi-channel pressure monitoring of the sensor assembly. The main control circuit board 7 is installed on the bottom cover 3 and is located at the bottom of the concave cavity. The main control circuit board 7 is connected to the sensor assembly through a cable to control the operation of the pressure scanning valve. The electrical connector 8 is installed on the top of the middle frame 2, and the electrical connector 8 is connected to the main control circuit board 7 and the external power supply through cables to realize power supply of the pressure scanning valve.

[0039] In this embodiment, the main control circuit board 7 is used to perform A / D analog-to-digital conversion on the amplified and transformed electrical signal and realize pressure compensation calibration, and convert it into a multi-channel pressure measurement value; the electrical connector 8 is used for the power supply input of the multi-channel micro pressure scanning valve and the input and output of digital information. The pressure scanning valve communicates with the engine controller or other aircraft onboard electrical equipment through the power supply socket and communication socket in the electrical connector 8, and the pressure data collected and processed by the pressure scanning valve is sent to the engine controller through the communication socket in the electrical connector 8. Furthermore, the main control circuit board 7 mainly includes a filter circuit, a power conversion circuit, a high-performance microprocessor, an A / D analog-to-digital conversion circuit, a multi-channel signal selector circuit, an RS422 bus interface circuit, an on-board temperature sensor, and calibration parameters / collected data storage.

[0040] In this embodiment, by installing a detachable top cover 1 and bottom cover 3 on the top and bottom of the middle frame 2, respectively, it is convenient to install the pressure scanning valve inside the aerospace aircraft engine, so as to more accurately measure the pressure changes inside the engine. By providing a plurality of vents 210 on the top of the middle frame 2, a concave cavity is provided inside the middle frame 2, the sensor assembly is installed on the top of the concave cavity, and a plurality of air ducts 102 corresponding to the vents 210 are provided on the top cover 1. The air ducts 102, the vents 210 and the sensor assembly are connected in sequence, that is, the sensor assembly performs multi-channel pressure monitoring. At the same time, the main control circuit board 7 is installed on the bottom cover 3, and the electrical connector 8 is installed on the top of the middle frame 2. The sensor assembly and the electrical connector 8 are connected to the main control circuit board 7 through cables, that is, the circuit connection is realized, ensuring the reliable operation of the sensor assembly, and being able to realize multi-channel pressure measurement with a wide temperature range, small size, light weight, autonomous control, high measurement accuracy and high cost performance.

[0041] like Figure 2 and Figure 3 As shown, the sensor assembly includes a conditioning circuit board 4, a rubber plate 5 and a pressure plate 6. A rubber plate 5 is provided between the conditioning circuit board 4 and the pressure plate 6, and the conditioning circuit board 4 and the middle frame 2 are sealed by glue filling, so that the conditioning circuit board 4 is sealed and installed. Fig.10 As shown, a total of 32 micro pressure sensors 401 are provided on the conditioning circuit board 4, and the micro pressure sensors 401 correspond to the vent holes 210 one by one to achieve multi-channel pressure measurement. It can be understood that in other embodiments, 8, 16, 64 or 128 micro pressure sensors 401 can be provided on the conditioning circuit board 4 to meet the needs of multi-channel pressure measurement.

[0042] In this embodiment, the conditioning circuit board 4 is used for amplifying and transforming weak electrical signals of multiple micro pressure sensors 401. The conditioning circuit board 4 is connected to the main control circuit board 7 through a cable, and the A / D analog-to-digital conversion circuit of the main control circuit board 7 is digitized and sent to the microprocessor to realize pressure compensation calibration; the electronic components in the main control circuit board 7 and the conditioning circuit board 4 are realized by selecting products with a wide operating temperature range. The pressure measurement type of the micro pressure sensor 401 supports absolute pressure and gauge pressure, and can realize differential pressure measurement by combining two or more measurement channels. The pressure measurement range of the micro pressure sensor can be configured according to demand, and the pressure measurement range can cover 0~100kPa, 0~300kPa, 0~500kPa, 0~700kPa, 0~1MPa and 0~1.5MPa, etc.

[0043] like Figure 4 , Fig.11 , Fig.12 and Fig.13 As shown, the middle frame 2 is provided with a plurality of second threaded holes 207, the conditioning circuit board 4 is provided with a plurality of third positioning holes 402, the rubber plate 5 is provided with a plurality of fourth positioning holes 501, and the pressing plate 6 is provided with a plurality of fifth positioning holes 601, and the third fastener 602 is screwed into the fifth positioning hole 601, the fourth positioning hole 501, the third positioning hole 402 and the second threaded hole 207 in sequence, so as to realize that the conditioning circuit board 4, the rubber plate 5 and the pressing plate 6 are fixedly connected to the top of the concave cavity of the middle frame 2. The third fastener 602 can be specifically a screw.

[0044] like Figure 1 , Figure 6 and Figure 7 As shown, the top cover 1 is provided with a plurality of first positioning holes 101, and the middle frame 2 is provided with a plurality of first threaded holes 204, and the first fasteners 103 are screwed into the first positioning holes 101 and the first threaded holes 204 to achieve the top cover 1 being fixedly connected to the top of the middle frame 2. The first fasteners 103 can be screws.

[0045] like Figure 3 and Figure 7 As shown, a plurality of annular grooves 202 are provided on the outer side of the top of the middle frame 2 , and the annular grooves 202 correspond to the vent holes 210 one by one. A sealing ring 9 is provided in the annular groove 202 to achieve a sealed connection between the vent holes 210 and the air duct 102 .

[0046] like Figure 8 As shown, a plurality of circular cavities 209 are provided on the inner side of the top of the middle frame 2 , the circular cavities 209 are connected to the vent holes 210 , and the micro pressure sensors 401 are located in the circular cavities 209 .

[0047] Furthermore, strip grooves 206 are arranged around the circular cavity 209, and slots 203 are arranged at the intersections of adjacent strip grooves 206 and penetrate the top of the middle frame 2. After the conditioning circuit board 4 is installed and fixed, sealant is poured through the slots 203 so that the sealant fills the strip grooves 206, so that each micro pressure sensor 401 is independently sealed in the square formed by the strip grooves 206.

[0048] In this embodiment, each circular cavity 209 is provided with strip grooves 206 that do not pass through the top of the middle frame 2 and are interconnected, and a slot 203 that passes through the top of the middle frame 2 is provided at the intersection of adjacent strip grooves 206. These strip grooves 206 are used for glue filling and sealing the micro pressure sensor 401 on the conditioning circuit board 4. Compared with using a sealing ring for each sensor independently, using the interconnected strip grooves 206 for glue filling and sealing is more conducive to reducing the volume of the middle frame 2 and helping to achieve the purpose of miniaturization of the scanning valve.

[0049] like Figure 5 , Figure 8 and Fig. 9 As shown, the middle frame 2 is provided with a plurality of third threaded holes 208, and the bottom cover 3 is provided with a plurality of second positioning holes 302. The second fasteners 304 are screwed into the second positioning holes 302 and the third threaded holes 208 to achieve the connection and fixation between the middle frame 2 and the bottom cover 3. The second fasteners 304 can be screws.

[0050] like Figure 2 and Figure 7 As shown, a mounting hole 205 is provided on one side of the top of the middle frame 2, and the mounting hole 205 is used to install the electrical connector 8; mounting ears 201 with holes are provided at the four corners of the middle frame 2, and a through hole 303 corresponding to the mounting ear 201 is provided on the bottom cover 3, and the pressure scanning valve is installed and fixed on the engine by screwing fasteners into the through hole 303 and the mounting ear 201.

[0051] like Fig. 9 As shown, a plurality of threaded hole bosses 301 are provided on the bottom cover 3, and a plurality of sixth positioning holes 701 are provided on the main control circuit board 7. The second fasteners 304 are screwed into the sixth positioning holes 701 and the threaded hole bosses 301 to achieve connection and fixation between the main control circuit board 7 and the bottom cover 3.

[0052] like Fig.14 As shown, the overall size of the multi-channel micro pressure scanning valve of this embodiment is 85mm×35mm×30.5mm, the installation hole spacing is 79mm×29mm, the hole diameter is Ф3.2mm, the product is small in size and light in weight, the interface of the air bleed pipe 102 is Ф2×5mm, and the top of the air bleed pipe 102 is directly inserted for easy installation, so as to meet the different pressure measurement requirements when simulating engines of different models and different operating conditions.

[0053] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A multi-channel micro pressure scanning valve, characterized in that: include: A top cover (1), a middle frame (2), a bottom cover (3), a main control circuit board (7), an electrical connector (8) and a sensor assembly; the top and bottom of the middle frame (2) are respectively provided with a detachable top cover (1) and a detachable bottom cover (3); the top of the middle frame (2) is provided with a plurality of vents (210); a concave cavity is provided inside the middle frame (2); the sensor assembly is installed at the top of the concave cavity; the top cover (1) is provided with a plurality of air ducts (102) corresponding to the vents (210); the air ducts (102), the vents (210) and the sensor assembly are sequentially connected to realize multi-channel pressure monitoring by the sensor assembly; the main control circuit board (7) is installed on the bottom cover (3) and is located at the bottom of the concave cavity; the main control circuit board (7) is connected to the sensor assembly through a cable to control the operation of the pressure scanning valve; the electrical connector (8) is installed on the top of the middle frame (2); the electrical connector (8) is respectively connected to the main control circuit board (7) and an external power source through a cable to realize power supply to the pressure scanning valve.

2. The multi-channel micro pressure scanning valve according to claim 1, characterized in that: The sensor assembly comprises a conditioning circuit board (4), a rubber plate (5) and a pressure plate (6); a rubber plate (5) is provided between the conditioning circuit board (4) and the pressure plate (6); and the conditioning circuit board (4) and the middle frame (2) are sealed by glue filling; a plurality of micro pressure sensors (401) are provided on the conditioning circuit board (4); the micro pressure sensors (401) correspond one-to-one to the vent holes (210) to achieve multi-channel pressure measurement.

3. The multi-channel micro pressure scanning valve according to claim 2, characterized in that: The middle frame (2) is provided with a plurality of second threaded holes (207), the conditioning circuit board (4) is provided with a plurality of third positioning holes (402), the rubber plate (5) is provided with a plurality of fourth positioning holes (501), and the pressure plate (6) is provided with a plurality of fifth positioning holes (601). The third fastener (602) is screwed into the fifth positioning hole (601), the fourth positioning hole (501), the third positioning hole (402) and the second threaded hole (207) in sequence, so as to realize the fixed connection of the conditioning circuit board (4), the rubber plate (5) and the pressure plate (6) to the top of the concave cavity of the middle frame (2).

4. The multi-channel micro pressure scanning valve according to claim 3, characterized in that: The top cover (1) is provided with a plurality of first positioning holes (101), the middle frame (2) is provided with a plurality of first threaded holes (204), and the first fasteners (103) are screwed into the first positioning holes (101) and the first threaded holes (204) to achieve fixed connection of the top cover (1) to the top of the middle frame (2).

5. The multi-channel micro pressure scanning valve according to claim 4, characterized in that: A plurality of annular grooves (202) are provided on the outer side of the top of the middle frame (2), and the annular grooves (202) correspond to the vent holes (210) one by one. A sealing ring (9) is provided in the annular groove (202) to achieve a sealed connection between the vent holes (210) and the air duct (102).

6. The multi-channel micro pressure scanning valve according to claim 5, characterized in that: A plurality of circular cavities (209) are provided on the inner side of the top of the middle frame (2), the circular cavities (209) are connected to the vent holes (210), and the micro pressure sensors (401) are located in the circular cavities (209).

7. The multi-channel micro pressure scanning valve according to claim 6, characterized in that: The circular cavity (209) is provided with strip grooves (206) all around, and the intersections of adjacent strip grooves (206) are provided with slot holes (203) penetrating the top of the middle frame (2); after the conditioning circuit board (4) is installed and fixed, sealant is poured through the slot holes (203) so that the sealant fills the strip grooves (206), so that each micro pressure sensor (401) is independently sealed in a grid formed by the strip grooves (206).

8. The multi-channel micro pressure scanning valve according to any one of claims 1 to 7, characterized in that: The middle frame (2) is provided with a plurality of third threaded holes (208), and the bottom cover (3) is provided with a plurality of second positioning holes (302). The middle frame (2) and the bottom cover (3) are connected and fixed by screwing second fasteners (304) into the second positioning holes (302) and the third threaded holes (208).

9. The multi-channel micro pressure scanning valve according to any one of claims 1 to 7, characterized in that: A mounting hole (205) is provided on one side of the top of the middle frame (2), and the mounting hole (205) is used to install an electrical connector (8); mounting ears (201) with holes are provided at four corners of the middle frame (2), and through holes (303) corresponding to the mounting ears (201) are provided on the bottom cover (3), so as to realize the installation and fixation of the pressure scanning valve.

10. The multi-channel micro pressure scanning valve according to any one of claims 2 to 7, characterized in that: The bottom cover (3) is provided with a plurality of threaded hole bosses (301), and the main control circuit board (7) is provided with a plurality of sixth positioning holes (701). The main control circuit board (7) and the bottom cover (3) are connected and fixed by screwing second fasteners (304) into the sixth positioning holes (701) and the threaded hole bosses (301).

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