Multi-channel pressure scanning valve

Abstract

The utility model discloses a multichannel pressure scanning valve, which is characterized in that the top of a shell upper cover is provided with a symmetrical inclined plane structure, a pressure sensor assembly is arranged in the inclined plane structure in a penetrating manner, the bottom of the shell upper cover is buckled with a shell bottom cover, and the inner side of the shell upper cover and the inner side of the shell bottom cover are respectively provided with a concave cavity structure; the power conversion circuit board, the conditioning circuit board and the main control circuit board are sequentially stacked, assembled and arranged and are fixed in the shell bottom cover, the pressure sensor assembly is connected to the conditioning circuit board through a cable, and the conditioning circuit board and the power conversion circuit board are respectively connected to the main control circuit board through a double-pin socket and a cable; an Ethernet socket and a power supply connector are arranged on the side portion of the shell bottom cover, the Ethernet socket is connected to the master control circuit board through a cable, and the power supply connector is connected to the power conversion circuit board through a cable. The utility model has the characteristics of compact structure, easy installation and debugging, good stability, high measurement precision, high integration level and the like, and can be suitable for application scenarios of high-voltage measurement.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure scanning valves, and particularly relates to a multi-channel pressure scanning valve. Background Art

[0002] A multi-channel pressure scanning valve, hereinafter referred to as "pressure scanning valve", is an instrument and equipment with multiple pressure signal measurement channels that can collect pressure signals of multiple pressure channels. According to the number of channels, pressure scanning valves can usually be divided into 8-channel, 16-channel, 32-channel, 64-channel, 128-channel, etc.

[0003] In the prior art, a pressure scanning valve must have the core function of "measurement" to measure multiple data in real time through multiple channels. At the same time, in order to ensure the long-term stability of the pressure scanning valve, it is necessary to regularly calibrate and verify the pressure scanning valve, so the pressure scanning valve also needs to have the important function of "calibration". The specific implementation is to use a standard pressure source to calibrate in each connected channel. In addition, to achieve the accuracy and reliability of the long-term repeated use of the pressure scanning valve, the pressure scanning valve also needs to have a "blowing" function, which can realize or support the convenient removal of impurities and foreign matters in the pipeline of the pressure measurement channel to avoid blockage of the pipeline or damage to the pressure-sensitive core by impurities or foreign matters. Therefore, how to quickly and safely realize the function switching between "measurement" and "calibration / blowing" is crucial. At present, the function switching method of the existing pressure scanning valve is mainly to use actuators such as air source drive switching and multi-way switching valves to realize the switching of the "measurement" and "calibration / blowing" functions of the pressure scanning valve. This method has the following main disadvantages:

[0004] (1) In the measurement application scenario of high pressure (≥1.5 MPa), the valve core of the multi-way switching valve body is prone to air leakage, resulting in the inability to guarantee the product sealing performance and seriously affecting the long-term stable working performance of the product.

[0005] (2) Multi-way switching usually adopts the method of switching the position of the valve body slider, and at the same time, multiple valve bodies are switched together, so it is difficult to guarantee the isolation ability between channels and the long-term stable realization of the product sealing performance.

[0006] At present, most pressure scanning valves adopt diffused silicon pressure sensors as pressure-sensitive elements. Due to the ease of miniaturization and mass production of diffused silicon pressure sensors, they are widely used. At the same time, diffused silicon pressure sensors have the advantages of high sensitivity output, good dynamic response, high measurement accuracy, and good stability. However, due to the temperature characteristics of semiconductors, the performance of diffused silicon pressure sensors will change due to the influence of temperature. And the current technical level is still unable to produce diffused silicon pressure sensors without temperature drift. Therefore, temperature compensation has always been a key technical issue in the application of diffused silicon pressure sensors. In actual application scenarios, the pressure scanning valves are complex and diverse, and it is difficult to ensure the temperature range of their working external environment. If the pressure scanning valve itself has the function of automatic temperature control, the accuracy of the pressure scanning valve can be better guaranteed, and there is no need to adopt complex or costly external heat preservation measures for the pressure scanning valve, thus making the pressure scanning valve more convenient in actual application.

[0007] For the scenario of multi-channel high-speed pressure measurement (≥500Hz), most pressure scanning valves adopt the method of ADC acquisition channel switching to achieve it. This method brings distortion such as mutation or spike to the true electrical signal of the pressure sensor during ADC channel switching, resulting in a delay waiting during acquisition. Therefore, in order to ensure the accuracy of sampling, the sampling speed needs to be reduced, which limits the sampling frequency of pressure measurement to a certain extent.

[0008] In summary, how to achieve a multi-channel pressure scanning valve that is easy to install, use, debug, and detect, has high accuracy, high sampling frequency, high real-time performance, low cost, is intelligent, has a high degree of integration, can work stably and reliably for a long time, and has a comprehensive function of automatic temperature control is one of the important problems that need to be solved urgently in this technical field. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a multi-channel pressure scanning valve that is easy to install, use, debug, and detect, has high accuracy, high sampling frequency, high real-time performance, low cost, is intelligent, has a high degree of integration, can work stably and reliably for a long time, and has a comprehensive function of automatic temperature control in view of the above problems of the prior art.

[0010] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0011] A multi-channel pressure scanning valve, comprising: an outer shell upper cover, an outer shell bottom cover, a pressure sensor assembly, a main control circuit board, a power conversion circuit board and a conditioning circuit board; the top of the outer shell upper cover is provided with a symmetrical inclined surface structure, and a plurality of the pressure sensor assemblies are arranged through and distributed in the inclined surface structure at the top of the outer shell upper cover. The bottom of the outer shell upper cover is buckled with the outer shell bottom cover, and the inner sides of the outer shell upper cover and the outer shell bottom cover enclose a closed concave cavity structure. The power conversion circuit board, the conditioning circuit board and the main control circuit board are sequentially stacked and assembled and fixed on the inner side of the outer shell bottom cover. The pressure sensor assembly is connected to the conditioning circuit board through a cable. A double-row pin socket is used for connection between the conditioning circuit board and the main control circuit board. The power conversion circuit board is connected to the main control circuit board through a cable; an Ethernet socket and a power supply connector are provided on the side of the outer shell bottom cover. The Ethernet socket is connected to the main control circuit board through a cable, and the power supply connector is connected to the power conversion circuit board through a cable.

[0012] As a further improvement of the present invention, the included angle α between the two inclined surface structures at the top of the outer shell upper cover is 90°-135°.

[0013] As a further improvement of the present invention, 2×n first mounting holes are staggeredly distributed on each of the two inclined surfaces at the top of the outer shell upper cover, where n is the number of single-row first mounting holes on each inclined surface at the top of the outer shell upper cover; two first threaded holes are provided on each first mounting hole for fixing the pressure sensor assembly.

[0014] As a further improvement of the present invention, the interiors of the two inclined surfaces at the top of the outer shell upper cover are both hollow structures to form cooling channels, and cooling medium interfaces communicating with the cooling channels are provided on both sides of the top of the outer shell upper cover to realize cooling of the pressure sensor assembly.

[0015] As a further improvement of the present invention, a threaded boss is provided at the inclined surface end of the upper cover concave cavity for installing an electric heating plate. The electric heating plate is connected to the main control circuit board and the power conversion circuit board through cables; through holes corresponding to the first mounting holes are provided on the electric heating plate; the electric heating plate is used for heating the pressure sensor assembly.

[0016] As a further improvement of the present invention, second threaded holes are provided at the four corners of the bottom of the outer shell upper cover, and countersunk holes are provided at the four corners of the top of the outer shell bottom cover. Fasteners are screwed into the second threaded holes and the countersunk holes to realize the covering connection between the outer shell upper cover and the outer shell bottom cover.

[0017] As a further improvement of the present invention, a plurality of threaded hole bosses are provided at the bottom of the bottom cover concave cavity for installing and fixing the main control circuit board.

[0018] As a further improvement of the present utility model, the side of the bottom cover of the housing is provided with a second mounting hole and a third mounting hole. The second mounting hole is used for mounting an Ethernet socket, and the third mounting hole is used for mounting a power supply connector.

[0019] As a further improvement of the present utility model, it further includes an external connection assembly. The connection assembly includes a one-way valve, a three-way adapter, and a stop valve. The three-way adapter is respectively communicated with a pressure sensor assembly, a one-way valve, and a stop valve through pipelines. The one-way valve is communicated with a calibration / blow-off gas pressure source through a pipeline, and the stop valve is communicated with a pressure measuring point of the object to be measured through a pipeline, so as to realize the function switching between "measurement" and "calibration / blow-off" of the pressure scanning valve.

[0020] As a further improvement of the present utility model, the main control circuit board includes: a high-performance processor, a plurality of multi-channel parallel A / D analog-to-digital conversion circuit modules, a communication interface circuit module, and a Flash / RAM Memory module; the conditioning circuit board includes a 4×n channel pressure signal conditioning circuit, where n is the number of single-row first mounting holes on each inclined plane at the top of the upper cover of the housing.

[0021] Compared with the prior art, the advantages of the present utility model are as follows:

[0022] 1. For the multi-channel pressure scanning valve of the present utility model, by setting the top of the upper cover of the housing as a symmetrical inclined plane structure and arranging a plurality of pressure sensor assemblies through the inclined plane structure, a plurality of independent pressure measurement channels are formed, taking into account the compactness of the structure and the convenience of installing and connecting the air pipes; further, the power conversion circuit board, the conditioning circuit board, and the main control circuit board are sequentially stacked and assembled and fixed in the bottom cover of the housing. The pressure sensor assembly is connected to the conditioning circuit board through a cable, the conditioning circuit board and the main control circuit board are connected by a double-row pin socket, and the power conversion circuit board is connected to the main control circuit board through a cable; the conditioning circuit board is used to realize the processing of pressure signal and temperature signal transformation, amplification, channel switching, etc., the main control circuit board is used to realize the analog-to-digital conversion, filtering processing, compensation calibration, parameter storage, data storage, data sending, generation of temperature control signals, etc. of pressure signals and temperature signals, and the power conversion circuit board is used to convert the external power supply voltage into the power supply voltage required by the pressure scanning valve itself, improving the functional integration degree of the pressure scanning valve; at the same time, an Ethernet socket and a power supply connector are provided on the side of the bottom cover of the housing. The Ethernet socket is connected to the main control circuit board through a cable to realize high-speed data transmission and improve the sampling frequency. The power supply connector is connected to the power conversion circuit board through a cable to realize stable power supply and ensure that the pressure scanning valve is in a continuous and stable working state. The present utility model has the characteristics of compact structure, easy installation and debugging, good stability, high measurement accuracy, and high integration degree, and can be well applied to the application scenario of high-pressure measurement.

[0023] 2. The multi-channel pressure scanning valve of the present utility model can achieve the temperature adjustment of the pressure scanning valve itself by arranging a cooling medium flow channel and an electric heating plate in the upper cover of the housing, reduce the influence of the external environment temperature on the pressure scanning valve, make it work within a temperature range with less variation, so as to better ensure the measurement accuracy of the pressure scanning valve.

[0024] 3. The multi-channel pressure scanning valve of the present utility model realizes the function switching of "measurement" and "calibration / purging" by adopting a one-way valve, a three-way adapter and a stop valve to form an external connection assembly, can effectively avoid the air leakage phenomenon of the switching valve, improve the isolation ability between channels, facilitate ensuring the long-term stable product sealing performance, especially for the application scenarios of high-pressure measurement, and is more convenient and efficient for the maintenance and repair operations at the measurement site.

[0025] 4. The multi-channel pressure scanning valve of the present utility model realizes multi-channel and high-speed pressure measurement by adopting components such as a high-performance processor, multiple high-speed multi-channel parallel analog-to-digital conversion chips, a parallel data interface and a gigabit Ethernet interface. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure principle of the multi-channel pressure scanning valve in the specific embodiment of the present utility model;

[0027] Figure 2 It is a schematic diagram of the sectional structure principle of the multi-channel pressure scanning valve in the specific embodiment of the present utility model;

[0028] Figure 3 It is a schematic diagram of the structure principle of the bottom cover of the housing in the specific embodiment of the present utility model;

[0029] Figure 4 It is a schematic diagram of the structure principle of the upper cover of the housing in the specific embodiment of the present utility model; (a) and (b) in the figure respectively represent schematic diagrams of different perspectives;

[0030] Figure 5 It is a schematic diagram of the layout of the mounting holes of the pressure sensor assembly in the specific embodiment of the present utility model;

[0031] Figure 6 It is a schematic diagram of the structure principle of the pressure sensor assembly in the specific embodiment of the present utility model;

[0032] Figure 7 It is a schematic diagram of the structure principle of the main control circuit board in the specific embodiment of the present utility model;

[0033] Figure 8 It is a schematic diagram of the structure principle of the power conversion circuit board in the specific embodiment of the present utility model;

[0034] Figure 9Schematic diagram of the structural principle of the conditioning circuit board in a specific embodiment of the present utility model;

[0035] Figure 10 Schematic diagram of the structural principle of the electric heating plate in a specific embodiment of the present utility model;

[0036] Figure 11 Application example diagram of the air path interface in a specific embodiment of the present utility model;

[0037] Figure 12 Principle block diagram of the circuit implementation in a specific embodiment of the present utility model;

[0038] Figure 13 Function block diagram of the AD7616 analog-to-digital conversion chip in a specific embodiment of the present utility model;

[0039] Figure 14 Schematic diagram of the implementation principle of high-speed performance in a specific embodiment of the present utility model;

[0040] Figure 15 Flow chart of the implementation of the temperature automatic control function in a specific embodiment of the present utility model;

[0041] Figure 16 Schematic diagram of the implementation structure of the calibration, measurement, and purging functions in a specific embodiment of the present utility model;

[0042] Figure 17 Simulation diagram of the compressive stress on the cooling channel in a specific embodiment of the present utility model;

[0043] Figure 18 Simulation diagram of the compressive deformation of the cooling channel in a specific embodiment of the present utility model.

[0044] Legend: 1. Upper shell cover; 1001. First mounting hole; 1002. First threaded hole; 1003. Second threaded hole; 1004. Upper cover cavity; 1005. Threaded boss; 1006. Cooling channel; 1007. Cooling medium interface; 2. Lower shell cover; 2001. Threaded hole boss; 2002. Countersunk hole; 2003. Second mounting hole; 2004. Third mounting hole; 2005. First mounting ear; 2006. Lower cover cavity; 3. Pressure sensor assembly; 3001. Air path interface; 3002. Second mounting ear; 4. Ethernet socket; 5. Power supply connector; 6. Main control circuit board; 7. Power conversion circuit board; 8. Conditioning circuit board; 9. Check valve; 9001. Check valve interface; 10. Three-way adapter; 11. Shut-off valve; 11001. Shut-off valve interface; 12. Pipeline; 13. Electric heating plate. Detailed implementation manners

[0045] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The following is by reference to the attached Figures 1 to 18 The described embodiments are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0046] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. These are only for the convenience of describing the present utility model 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 thus should not be construed as limiting the present utility model.

[0047] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0048] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "fixed", "embedded", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0049] Embodiment

[0050] Such as Figure 1 、 Figure 2 、 Figure 7 、 Figure 8 And Figure 9As shown in the figure, the multi-channel pressure scanning valve of the present utility model includes: an upper shell cover 1, a lower shell cover 2, a pressure sensor assembly 3, a main control circuit board 6, a power conversion circuit board 7, and a conditioning circuit board 8. The top of the upper shell cover 1 is provided with a symmetrical inclined surface structure, and a plurality of pressure sensor assemblies 3 are arranged through the inclined surface structure at the top of the upper shell cover 1. The bottom of the upper shell cover 1 is buckled with the lower shell cover 2. The inner side of the upper shell cover 1 is an upper cover cavity 1004, and the inner side of the lower shell cover 2 is a bottom cover cavity 2006. The inner sides of the upper shell cover 1 and the lower shell cover 2 enclose a closed cavity structure to accommodate cables. The power conversion circuit board 7, the conditioning circuit board 8, and the main control circuit board 6 are sequentially stacked and assembled and fixed on the inner side of the lower shell cover 2. The pressure sensor assembly 3 is connected to the conditioning circuit board 8 through a cable; a double-row pin socket is used to connect between the conditioning circuit board 8 and the main control circuit board 6, and the power conversion circuit board 7 is connected to the main control circuit board 6 through a cable; an Ethernet socket 4 and a power supply connector 5 are provided on the side of the lower shell cover 2. The Ethernet socket 4 is connected to the main control circuit board 6 through a cable, and the power supply connector 5 is connected to the power conversion circuit board 7 through a cable.

[0051] Further, the included angle α between the two inclined surface structures at the top of the upper shell cover 1 is 90° to 135°, realizing a compact structure and facilitating the disassembly and assembly of the pressure measuring joint. In this embodiment, the included angle α between the two inclined surfaces is 110°, and each inclined surface is staggeredly distributed with 2×n first mounting holes 1001, that is, two rows on each inclined surface, with n in each row. The first mounting holes 1001 are staggeredly arranged on the inclined surface, which is beneficial to the pipeline distribution in the same plane and saves space. As Figure 1 shown, in this embodiment, there are 8 first mounting holes 1001 in each row, and a total of 32 first mounting holes 1001 are provided at the top of the upper shell cover 1.

[0052] As Figure 4 and Figure 5 shown, two first threaded holes 1002 are provided on each first mounting hole 1001 for fixing the pressure sensor assembly 3. As Figure 6 shown, two second mounting lugs 3002 are symmetrically provided on the pressure sensor assembly 3. The pressure sensor assembly 3 is installed in the first mounting hole 1001 on the inclined surface at the top of the upper shell cover 1, fixed to the first threaded hole 1002 by screws through the second mounting lugs 3002, and connected to the conditioning circuit board 8 through a cable.

[0053] As Figure 4 shown, the interiors of the two inclined surfaces at the top of the upper shell cover 1 are both hollow structures to form a cooling flow channel 1006, and cooling medium interfaces 1007 communicating with the cooling flow channel 1006 are provided on both sides of the top of the upper shell cover 1 to realize the cooling of the pressure sensor assembly 3.

[0054] As Figure 2 and Figure 4As shown, a threaded boss 1005 is provided at the inclined end of the upper cover cavity 1004 for mounting the electric heating plate 13. The electric heating plate 13 is connected to the main control circuit board 6 and the power conversion circuit board 7 through a cable, and the electric heating plate 13 is used to heat the pressure sensor assembly 3. As Figure 10 shown, through holes corresponding to the first mounting holes 1001 are provided on the electric heating plate 13 to facilitate the mounting and fixing of the pressure sensor assembly 3 on the top of the outer shell upper cover 1.

[0055] As Figure 3 and Figure 4 shown, second threaded holes 1003 are provided at the four corners of the bottom of the outer shell upper cover 1, and countersunk holes 2002 are provided at the four corners of the top of the outer shell bottom cover 2. Fasteners are screwed into the second threaded holes 1003 and the countersunk holes 2002 to realize the covering connection between the outer shell upper cover 1 and the outer shell bottom cover 2.

[0056] As Figure 2 and Figure 3 shown, a plurality of threaded hole bosses 2001 are provided at the bottom of the bottom cover cavity 2006 for mounting and fixing the main control circuit board 6. Specifically, the power conversion circuit board 7, the conditioning circuit board 8 and the main control circuit board 6 are stacked and assembled in sequence and fixed on the threaded bosses 2001 at the bottom of the bottom cover cavity 2006 through fasteners.

[0057] As Figure 1 and Figure 3 shown, a second mounting hole 2003 and a third mounting hole 2004 are provided on the side of the outer shell bottom cover 2. The second mounting hole 2003 is used to mount the Ethernet socket 4, and the third mounting hole 2004 is used to mount the power supply connector 5. Further, the Ethernet socket 4 is a gigabit Ethernet socket.

[0058] In this embodiment, the overall size of the multi-channel pressure scanning valve is 228mm×120mm×105mm. Among them, the outer shell upper cover 1 and the outer shell bottom cover 2 are both made of aluminum alloy and can be processed by CNC. Aluminum alloy not only has light weight and is easy to process, but also can improve the aesthetics and corrosion resistance through surface anodization. In order to reduce weight, reduce volume, and avoid interference between the tools used during assembly and other structures. The mounting surface of the pressure sensor assembly 3 on the outer shell upper cover 1 is divided into two inclined surfaces with an included angle of 110°. A total of 4×8 = 32 first mounting holes 1001 are arranged on the two inclined surfaces. The first mounting holes 1001 on each inclined surface adopt a distribution method of 2 rows and 8 columns, with each row staggered by one position. The outer shell of the pressure sensor assembly 3 is made of stainless steel and can be processed by CNC. Compared with aluminum alloy, stainless steel has higher mechanical strength, can significantly improve the service life of the gas path interface 3001, and excellent corrosion resistance enables the exposed part of the structure to have better environmental adaptability.

[0059] Furthermore, for high-pressure and multi-range measurement application scenarios, the pressure measurement range of the pressure sensor assembly 3 covers 0 to 1 MPa, 0 to 4 MPa, 0 to 8 MPa, and 0 to 15 MPa. Among them, the number of channels for the pressure measurement range of 0 to 1 MPa is configured as 8 channels, the number of channels for the pressure measurement range of 0 to 4 MPa is configured as 8 channels, the number of channels for the pressure measurement range of 0 to 8 MPa is configured as 8 channels, and the number of channels for the pressure measurement range of 0 to 15 MPa is configured as 8 channels. According to the pressure measurement range, referring to the "Technical Conditions for Flareless Tube Fittings - GB / T 3765-2008", the gas path interface 3001 uniformly adopts an M10 ferrule interface to facilitate the interchange between multi-channel pressure measurement channels.

[0060] As Figure 12 shown, the electrical circuit composition of the multi-channel pressure scanning valve in this embodiment includes: a pressure sensor assembly 3, a conditioning circuit board 8, a main control circuit board 6, an Ethernet socket 4, a power supply connector 5, a power conversion circuit board 7, an electric heating plate 13, and a cable (not shown in the figure). The pressure sensor assembly 3 senses the pressure and temperature of each pressure measurement channel and converts them into pressure signals and temperature signals. The conditioning circuit board 8 performs processing such as signal transformation, amplification, and channel switching on the pressure signals and temperature signals. The main control circuit board 6 performs analog-to-digital conversion, filtering, compensation calibration, parameter storage, data storage, data transmission, and generation of temperature control signals on the pressure signals and temperature signals. The power conversion circuit board 7 converts the external power supply voltage into the power supply voltage required by the pressure scanning valve itself. The Ethernet socket 4 is used for high-speed data transmission. The power supply connector 5 is used to connect to the external power supply. The electric heating plate 13 is used to generate heat to achieve self-internal heating of the pressure scanning valve. The cable is used for electrical connection between the various electrical resistance components.

[0061] The conditioning circuit board 8 and the main control circuit board 6 are connected by a double-row pin socket, supporting an up-and-down stacked connection and installation method. The 4×n channel pressure signals of the conditioning circuit board 8 are transmitted to the main control circuit board 6 for analog-to-digital conversion, calibration compensation, and other processing. The quantity is related to the number of channels of the pressure scanning valve. When the number of channels of the pressure scanning valve is 8, 16, 32, 64, or 128, the minimum number of pins of the double-row pin socket is 8, 16, 32, 64, or 128.

[0062] As Figure 12As shown, the conditioning circuit board 8 has a 4×n channel pressure signal conditioning circuit, where n is the number of single-row first mounting holes 1001 on each inclined surface of the upper housing cover 1. The top circuit of the first channel pressure signal conditioning circuit is connected to the first channel pressure sensor assembly 3 through a cable, and the first channel pressure signal and the first channel pressure signal of the first channel pressure sensor assembly 3 are connected to the conditioning circuit board 8 for conditioning. Similarly, the second channel pressure signal conditioning circuit is connected to the second channel pressure sensor assembly 3 through a cable, and the nth channel pressure signal conditioning circuit is connected to the nth channel pressure sensor assembly 3 through a cable. The pressure signal conditioning circuit in the conditioning circuit board 8 amplifies and transforms the pressure signal and temperature signal output by the pressure sensor assembly 3. The amplified and transformed pressure signal is directly output to the main control circuit board 6, which is beneficial for the main control circuit board 6 to perform high-speed and high-precision sampling and analog-to-digital conversion of the pressure signal, so as to better support the realization of high-speed pressure measurement sampling of the pressure scanning valve. The amplified and transformed temperature signal is output to the main control circuit board 6 through the multi-channel signal selector in the conditioning circuit board 8.

[0063] As Figure 12 shown, the main control circuit board 6 includes: a high-performance processor, multiple multi-channel parallel A / D analog-to-digital conversion circuit modules, a communication interface circuit module, and a Flash / RAM Memory module. The high-performance processor in the main control circuit board 6 uses a high-performance processor chip based on the X86 architecture multi-core with a main frequency of not less than 1 GHz. Preferably, the high-performance processor in the main control circuit board 6 can be selected Atom TM E3845 quad-core CPU with a main frequency of 1.91 GHz, which can better balance low power consumption and high processing performance.

[0064] The multiple multi-channel parallel A / D analog-to-digital conversion circuit modules of the main control circuit board 6 use chips that support multi-channel parallel to complete A / D analog-to-digital conversion. To meet the sampling accuracy and sampling speed, the sampling accuracy of the A / D analog-to-digital conversion chip is better than 14 bits, and the sampling speed of each sampling channel is better than 100 kSPS. At the same time, the multiple multi-channel parallel A / D analog-to-digital conversion circuit modules of the main control circuit board 6 and the high-performance processor of the main control circuit board 6 use a parallel data bus to achieve fast data interaction, so as to support a fast and high-precision filtering algorithm and a data update output frequency of up to 10 kHz, thereby realizing high-speed and high-precision pressure measurement. Preferably, the A / D analog-to-digital conversion chip uses the AD7616 analog-to-digital conversion chip of ADI Company, as Figure 13As shown, the AD7616 is a 16-bit DAS that supports dual-channel synchronous sampling of 16 channels. The AD7616 is powered by a single 5V power supply and can process true bipolar input signals of ±10V, ±5V, and ±2.5V. At the same time, each pair of channels can sample at a throughput rate of up to 1MSPS and a 90.5dB SNR. Further, the main control circuit board 6 can adopt 3 multi-channel parallel A / D analog-to-digital conversion circuit modules. Among them, 2 multi-channel parallel A / D analog-to-digital conversion circuit modules are used for parallel acquisition of 32-channel pressure signals, and each pressure acquisition can achieve a sampling speed of up to 1MSPS. One of the multi-channel parallel A / D analog-to-digital conversion circuit modules is used for the acquisition of 32-channel temperature signals. At the same time, due to the relatively independent design of each functional module of "sensor, signal conditioning, analog-to-digital conversion, and signal processing" in the pressure scanning valve of this embodiment, it supports later upgrade by replacing the main control circuit board 6 or the conditioning circuit board 8, and can improve the acquisition accuracy, sampling rate, or sampling quality of sensor signals.

[0065] Multiple multi-channel parallel A / D analog-to-digital conversion circuit modules in the main control circuit board 6 convert the multi-channel temperature electrical signal analog quantities and multi-channel pressure electrical signal analog quantities output from the conditioning circuit board 8 into digital values and transmit them to the high-performance processor in the main control circuit board 6 for processing. The communication interface circuit module implements the gigabit Ethernet protocol and is used for pressure data transmission.

[0066] The Flash / RAM Memory module is used to store parameters, data, etc.

[0067] As Figure 12 and Figure 14As shown, the multi-channel pressure scanning valve of this embodiment can achieve fast transmission of pressure signals, can rapidly collect and convert pressure signals into data, support rapid data compensation and calibration, and the compensated and calibrated data can be transmitted to other systems at high speed. Specifically, after being conditioned, the 4×n channel pressure signals in the conditioning circuit board 8 are directly transmitted to the main control circuit board 6 through a double-row pin socket. The number of pins of the double-row pin socket meets the requirement that the 4×n channel pressure signals do not require a multi-channel signal selector, avoiding signal mutation and delay caused by the 4×n channel pressure signals passing through a multi-channel signal selector. In the main control circuit board 6, multiple multi-channel parallel A / D analog-to-digital conversion circuit modules are used to implement at least 4×n analog acquisition channels to match the acquisition of the 4×n channel pressure signals. The multiple multi-channel parallel A / D analog-to-digital conversion circuit modules in the main control circuit board 6 use chips that support multi-channel parallel A / D analog-to-digital conversion. Preferably, the A / D analog-to-digital conversion chip can use the AD7616 analog-to-digital conversion chip of ADI Company with a 16-bit accuracy, 16 analog acquisition channels, and each channel supporting a sampling rate of up to 1MSPS. The data interaction between the A / D analog-to-digital conversion chip in the main control circuit board 6 and the high-performance processor in the main control circuit board 6 uses a high-speed parallel data bus to meet fast data transmission. The high-performance processor in the main control circuit board 6 uses a high-performance processor chip based on the X86 architecture with a multi-core main frequency of not less than 1GHz to support the operation of multi-channel high-speed and complex compensation and calibration algorithms. The high-performance processor in the main control circuit board 6 has a Gigabit Ethernet interface and can transmit the compensated and calibrated data to other systems through the Ethernet socket 4. The maximum data transmission speed of Gigabit Ethernet is 1000Mbps. If the maximum number of channels of the multi-channel pressure scanning valve of this embodiment is 128, the data update output frequency is 10kHz, and the pressure data of each channel is 16-bit accuracy, then the required data transmission speed of the pressure scanning valve is 128×16×10k = 20480kbps = 20.48Mbps. The required data transmission speed (20.48Mbps) is much less than the maximum data transmission speed (1000Mbps), accounting for about 2% of the data transmission bandwidth, with a large margin.

[0068] As Figure 11 and Figure 15As shown in the figure, the pressure scanning valve of this embodiment is equipped with a cooling flow channel 1006 and an electric heating plate 13, which can realize the temperature regulation of the pressure scanning valve itself, reduce the influence of the external environmental temperature on the pressure scanning valve, make it work within a temperature range with less variation, and better ensure the measurement accuracy of the pressure scanning valve. Specifically, the electric heating plate 13 is heated by the way of power resistance energization to generate heat. The energization heating and power-off stop heating of the electric heating plate 13 are controlled by the main control circuit board 6 to process and output control signals. The main control circuit board 6 processes and judges according to the temperature signals of the 4×n pressure sensor assemblies 3. Preferably, the temperature signal values of the 4×n pressure sensor assemblies 3 are sorted from high to low, the highest temperature value and the lowest temperature value are excluded, and the average value of the remaining (4×n - 2) temperature signal values is taken to obtain the average temperature value.

[0069] When the average temperature value is lower than the heating threshold, the main control circuit board 6 outputs a heating start signal to the electric heating plate 13, and the electric heating plate 13 is energized for heating. At this time, the main control circuit board 6 also sends a message of "stop cooling medium supply" to the host measurement and control system through the Ethernet socket 4 at the same time, and the host measurement and control system controls to turn off the cooling medium function and stop the cooling function.

[0070] When the average temperature value is higher than the cooling threshold, the main control circuit board 6 outputs a heating off signal to the electric heating plate 13, and the electric heating plate 13 is powered off to stop heating. At this time, the main control circuit board 6 also sends a message of "start cooling medium supply" to the host measurement and control system through the Ethernet socket 4 at the same time, and the host measurement and control system controls to turn on the cooling medium function and start the cooling function.

[0071] The heating threshold is less than the cooling threshold. Preferably, the value ranges of the heating threshold and the cooling threshold are 0 to 50 °C or a smaller range. Under the condition that the heat dissipation capabilities of the electric heating plate 13 and the cooling medium permit, the smaller the difference between the heating threshold and the cooling threshold, the smaller the temperature influence range of the pressure scanning valve, which is more conducive to ensuring the realization of the pressure measurement accuracy of the pressure scanning valve. The cooling medium can be liquid media such as water and kerosene.

[0072] Such as Figure 11 and Figure 16As shown in the figure, the pressure scanning valve of this embodiment uses a one-way valve 9, a three-way adapter 10, and a globe valve 11 as external connection components to realize the function switching between "measurement" and "calibration / blowdown", which can effectively avoid the air leakage phenomenon of the switching valve, improve the isolation ability between channels, and facilitate ensuring the long-term stable realization of product sealing performance. Especially for the application scenarios of high-pressure measurement, and the operation of maintenance and repair at the measurement site is more convenient and efficient. Specifically, the pressure sensor assembly 3 is installed and fixed on the top of the outer shell upper cover 1. The pressure sensor assembly 3 is connected to the three-way adapter 10 through a pipeline 12 to communicate the pressure measurement path. The three-way adapter 10 is connected to the one-way valve 9 through a pipeline 12, and the three-way adapter 10 is connected to the globe valve 11 through a pipeline 12. The one-way valve interface 9001 of the one-way valve 9 is connected to the calibration / blowdown gas pressure source through a pipeline 12, and the globe valve interface 11001 of the globe valve 11 is connected to the pressure measurement point of the object to be measured through a pipeline 12.

[0073] The one-way valve 9 allows the calibration / blowdown gas to flow from the calibration / blowdown gas pressure source to the three-way adapter 10, and the gas or liquid in the three-way adapter 10 cannot flow in the direction of the calibration / blowdown gas pressure source.

[0074] The globe valve 11 can be electrically or manually operated to connect or disconnect the three-way adapter 10 from the pressure measurement point of the object to be measured. When the globe valve 11 is opened, the three-way adapter 10 is connected to the pressure measurement point of the object to be measured. When the globe valve 11 is closed, the three-way adapter 10 is disconnected from the pressure measurement point of the object to be measured.

[0075] When the pressure scanning valve needs to realize the "measurement" function, the globe valve 11 is opened, and the pressure at the pressure measurement point of the object to be measured is transmitted to the pressure sensor assembly 3 through the globe valve 11, the three-way adapter 10, and the pipeline 12. At this time, the gas or liquid in the three-way adapter 10 cannot flow in the direction of the calibration / blowdown gas pressure source and the pressure at the calibration / blowdown gas pressure source is in the atmospheric pressure state. The pressure sensor assembly 3 can stably sense the pressure at the pressure measurement point of the object to be measured. The pressure sensor assembly 3 converts the pressure into a pressure signal, which is collected and compensated by the pressure scanning valve, thereby realizing the measurement of pressure.

[0076] When the pressure scanning valve needs to implement the "calibration" function, the stop valve 11 is closed, and the calibration / purge gas pressure source is adjusted to output gases of different pressures, which flow into the three-way adapter 10 and the pipeline 12 through the one-way valve 9 and are transmitted to the pressure sensor assembly 3. At this time, the gas in the three-way adapter 10 cannot flow toward the pressure measurement point of the measured object. Therefore, the pressure sensor assembly 3 can stably sense the pressure output by the calibration / purge gas pressure source, and calibrate each pressure channel through the calibration process to ensure the accuracy of the pressure scanning valve measurement function. At the same time, the "calibration" function can be operated without disassembling the pressure scanning valve product at the use site, realizing the convenience of using the pressure scanning valve.

[0077] When the pressure scanning valve needs to realize the "blowing" function, the stop valve 11 is opened, and the calibration / blowing gas pressure source is adjusted to output a certain pressure (high pressure) of gas, which flows into the three-way adapter 10, the pipeline 12, and the stop valve 11 through the one-way valve 9 and is transferred to the pressure measuring point of the measured object and discharged. The impurities, foreign matter or liquid residues in the pipeline 12 between the three-way adapter 10 and the stop valve 11 and the pipeline 12 between the three-way adapter 10 and the pressure measuring point of the measured object can be blown away, which can effectively avoid the hidden danger of pipeline blockage, thereby realizing the blowing function of the pressure channel and ensuring the accuracy of the pressure scanning valve measurement function. The gas of certain pressure (high pressure) can use air, nitrogen or carbon dioxide, etc.

[0078] like Figure 4 , Figure 17 , Figure 18 As shown, the upper cover 1 of the housing is made of aluminum alloy 7075, and the cooling medium interface 1007 is an M10 ferrule interface. When the cooling medium needs to be introduced to cool the pressure scanning valve, the temperature of the cooling medium is lower than the temperature of the pressure scanning valve structure. The user can choose water, kerosene and other easy-to-flow liquids according to needs. Specifically, a cooling medium with a certain pressure and flow rate is introduced into the internal flow channel 1006 of the upper cover 1 of the housing, and the upper cover 1 of the housing has two cooling medium interfaces 1007. The cooling medium flows in from one of the cooling medium interfaces 1007, flows in the cooling flow channel 1006 and absorbs the heat in the pressure scanning valve structure, and flows out from the other cooling medium interface 1007, so that the cooling medium takes away the heat in the pressure scanning valve structure to achieve the effect of cooling. In this embodiment, the overall size of the multi-channel pressure scanning valve is 228mm×120mm×105mm, and the cooling flow channel 1006 of the upper cover 1 of the housing is introduced into the cooling medium with a pressure of 6MPa, and its maximum deformation stress is 1.03×108N / m 2 , less than the yield strength of the material 5.05×108N / m 2, the maximum deformation displacement is about 0.027 mm, the structure will not undergo plastic deformation and the deformation amount is very small. Therefore, it can achieve good heat dissipation effect of the pressure scanning valve while ensuring the integrity of the structure of the pressure scanning valve.

[0079] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A multi-channel pressure scanning valve, characterized in that, Including: An upper shell cover (1), a lower shell cover (2), a pressure sensor assembly (3), a main control circuit board (6), a power conversion circuit board (7), and a conditioning circuit board (8); the top of the upper shell cover (1) is provided with a symmetric inclined surface structure, and a plurality of the pressure sensor assemblies (3) are arranged in a penetrating manner in the inclined surface structure at the top of the upper shell cover (1). The bottom of the upper shell cover (1) is buckled with the lower shell cover (2). The inner side of the upper shell cover (1) is an upper cover concave cavity (1004), and the inside of the lower shell cover (2) is a lower cover concave cavity (2006). The power conversion circuit board (7), the conditioning circuit board (8), and the main control circuit board (6) are sequentially stacked and assembled and fixed on the inner side of the lower shell cover (2). The pressure sensor assembly (3) is connected to the conditioning circuit board (8) through a cable. A double-row pin socket is used for connection between the conditioning circuit board (8) and the main control circuit board (6). The power conversion circuit board (7) is connected to the main control circuit board (6) through a cable. An Ethernet socket (4) and a power supply connector (5) are provided on the side of the lower shell cover (2). The Ethernet socket (4) is connected to the main control circuit board (6) through a cable, and the power supply connector (5) is connected to the power conversion circuit board (7) through a cable.

2. The multi-channel pressure scanning valve according to claim 1, characterized in that, The included angle α between the two inclined surface structures at the top of the upper shell cover (1) is 90° to 135°.

3. The multi-channel pressure scanning valve according to claim 2, wherein 2×n first mounting holes (1001) are distributed in a staggered manner on each of the two inclined surfaces at the top of the upper shell cover (1), where n is the number of single-row first mounting holes (1001) on each inclined surface at the top of the upper shell cover (1); two first threaded holes (1002) are provided on each first mounting hole (1001) for fixing the pressure sensor assembly (3).

4. The multi-channel pressure scanning valve according to claim 3, characterized in that, The interiors of the two inclined surfaces at the top of the upper shell cover (1) are both hollow structures to form a cooling flow channel (1006), and cooling medium interfaces (1007) communicating with the cooling flow channel (1006) are provided on both sides of the top of the upper shell cover (1) to achieve cooling of the pressure sensor assembly (3).

5. The multi-channel pressure scanning valve according to claim 4, characterized in that, A threaded boss (1005) is provided at the inclined surface end of the upper cover concave cavity (1004) for installing an electric heating plate (13). The electric heating plate (13) is connected to the main control circuit board (6) and the power conversion circuit board (7) through cables; through holes corresponding to the first mounting holes (1001) are provided on the electric heating plate (13); the electric heating plate (13) is used for heating the pressure sensor assembly (3).

6. The multi-channel pressure scanning valve according to any one of claims 1 to 5, characterized in that, Second threaded holes (1003) are provided at the four corners of the bottom of the upper shell cover (1), and countersunk holes (2002) are provided at the four corners of the top of the lower shell cover (2). Fasteners are screwed into the second threaded holes (1003) and the countersunk holes (2002) to achieve the covering connection between the upper shell cover (1) and the lower shell cover (2).

7. The multi-channel pressure scanning valve according to any one of claims 1 to 5, characterized in that A plurality of threaded hole bosses (2001) are provided at the bottom of the lower cover concave cavity (2006) for installing and fixing the main control circuit board (6).

8. The multi-channel pressure scanning valve according to any one of claims 1 to 5, characterized in that The side of the bottom cover (2) of the housing is provided with a second mounting hole (2003) and a third mounting hole (2004). The second mounting hole (2003) is used for mounting an Ethernet socket (4), and the third mounting hole (2004) is used for mounting a power supply connector (5).

9. The multi-channel pressure scanning valve according to any one of claims 1 to 5, characterized in that It further includes an external connection component. The connection component includes a check valve (9), a three-way adapter (10), and a shut-off valve (11). The three-way adapter (10) is respectively communicated with a pressure sensor assembly (3), a check valve (9), and a shut-off valve (11) through pipes (12). The check valve (9) is communicated with a calibration / blow-off gas pressure source through a pipe (12), and the shut-off valve (11) is communicated with a pressure measurement point of the object to be measured through a pipe (12) to realize the function switching of the pressure scanning valve between "measurement" and "calibration / blow-off".

10. The multi-channel pressure scanning valve according to any one of claims 3 to 5, characterized in that The main control circuit board (6) includes: a high-performance processor, a plurality of multi-channel parallel A / D analog-to-digital conversion circuit modules, a communication interface circuit module, and a Flash / RAM Memory module; the conditioning circuit board (8) includes a 4×n-channel pressure signal conditioning circuit, where n is the number of single-row first mounting holes (1001) on each inclined surface at the top of the upper cover (1) of the housing.

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