Calibration device

Abstract

The present application relates to a kind of calibration devices for calibrating air-tight leak detector, including shell, with first interface, second interface and third interface, one end of three interfaces is used to connect with reference port, reference port and gas inlet of air-tight leak detector in turn, wherein, the other end of third interface can be communicated with outside or disconnected;Pressure control component, including pressure control module and pressure control pump arranged in shell, one end of pressure control module is communicated with pressure control pump, the other end can be communicated with first interface or second interface, pressure control pump is used for gas supply, and pressure control module is used for adjusting air pressure;Pressure gauge, arranged outside shell and used for detecting air pressure of second interface;Control hub, electrically connected with pressure control module, control hub is used to control pressure control module to adjust air pressure to required pressure, required pressure is obtained by control hub according to input parameter and preset program calculation;Realize the automation regulation and control in calibration process, effectively improve calibration efficiency and calibration accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of calibration equipment for air tightness leak detector, in particular to a calibration device. BACKGROUND

[0002] In the field of new energy vehicle and key component manufacturing, air tightness leak detector is the core measuring equipment to ensure the sealing of battery pack, motor and other electrical systems, and its value accuracy directly affects product safety.

[0003] At present, the calibration device used in the calibration of air tightness leak detector is assembled by independent standard device, after connecting the standard device to the air tightness leak detector, the pressure value is manually adjusted through the pressure adjusting knob on the device, and then the pressure on the screen is read, recorded and processed.

[0004] In this process, since manual pressure adjustment and reading are repeated for each calibration pressure point, on the one hand, the operation efficiency is affected, and on the other hand, operation errors are easily introduced, affecting the calibration accuracy. SUMMARY

[0005] Therefore, it is necessary to provide a calibration device which can effectively improve the calibration efficiency and calibration accuracy in view of the low calibration efficiency and low calibration accuracy of the calibration device for air tightness leak detector.

[0006] The present application provides a calibration device for calibrating air tightness leak detector, comprising:

[0007] The shell is provided with a first interface, a second interface and a third interface, one end of the three interfaces is used for connecting the reference port, the reference port and the air inlet of the air tightness leak detector in turn, wherein the other end of the third interface can be connected with the outside or disconnected;

[0008] The pressure control assembly comprises a pressure control module and a pressure control pump arranged in the shell, one end of the pressure control module is communicated with the pressure control pump, and the other end can be communicated with the first interface or the second interface, the pressure control pump is used for gas supply, and the pressure control module is used for adjusting air pressure;

[0009] The pressure gauge is arranged outside the shell and is used for detecting the air pressure of the second interface;

[0010] The control center is electrically connected with the pressure control module, and is used for controlling the pressure control module to adjust the air pressure to the required pressure, wherein the required pressure is calculated by the control center according to the input parameters and the preset program.

[0011] In one embodiment, the control center is also electrically connected with the pressure gauge, and is used for controlling the pressure control module to adjust the air pressure to the required pressure according to the feedback air pressure, wherein the feedback air pressure is the air pressure detected by the pressure gauge.

[0012] In one of the embodiments, the pressure control module comprises a pressure control base, a valve rod and a driving module, one end of the pressure control base is communicated with the pressure control pump, the other end is capable of being communicated with the first interface or the second interface, the valve rod penetrates into the pressure control base, and the driving module is used to drive the valve rod to move, so as to change the flow area in the pressure control base.

[0013] In one of the embodiments, a baffle with S-shaped cross section is fixed inside the pressure control base, the baffle is provided with a through slot with trapezoidal cross section, the valve rod is fixed with a valve block with triangular cross section corresponding to the through slot, and the driving module is used to drive the valve rod to move in length, so as to control the flow area between the valve block and the through slot.

[0014] In one of the embodiments, a pressure control top is fixed on the top of the pressure control base, the valve rod is located in the pressure control top, and the pressure control top is divided into a first chamber and a second chamber, and the driving module is used to supply air to the first chamber or the second chamber to control the valve rod.

[0015] In one of the embodiments, the driving module comprises a pressure compensation air pump, a pressure stabilizing tank, four pressure gauges and a pressure control processor, the pressure stabilizing tank is communicated with the first chamber, the pressure compensation air pump is communicated with the pressure stabilizing tank, the four pressure gauges are respectively used to detect the air pressure of the first chamber, the second chamber and the two ends of the pressure control base, the pressure compensation air pump and the four pressure gauges are electrically connected with the pressure control processor, and the pressure control processor is electrically connected with the control center.

[0016] In one of the embodiments, the calibration device comprises a plurality of pressure gauges with different scales, each of the pressure gauges is communicated with the second interface through a corresponding pressure gauge control valve.

[0017] The control center is electrically connected with each of the pressure gauge control valves, so as to control the opening and closing of each of the pressure gauge control valves according to the input parameters and the preset program.

[0018] In one of the embodiments, the calibration device further comprises a standard leak hole and a standard volume tank, the standard leak hole is capable of being communicated with the third interface, and the standard volume tank is capable of being communicated with the second interface.

[0019] In one of the embodiments, the calibration device further comprises a plurality of standard leak holes with different leak rates and two groups of identical volume tank assemblies, each group of the volume tank assemblies comprising a plurality of standard volume tanks with different volumes, each of the standard leak holes being in communication with the third interface through a corresponding leak hole control valve, and each of the standard volume tanks being in communication with the second interface through a corresponding volume tank control valve.

[0020] The control hub is electrically connected with each of the leak hole control valves and the volume tank control valves to control opening and closing of each of the leak hole control valves and the volume tank control valves according to the input parameters and the preset program.

[0021] In one of the embodiments, the shell is further provided with a fourth interface for connecting with a serial port interface of the air tightness leak detector and a camera module, and the fourth interface and the camera module are electrically connected with the control hub.

[0022] The calibration device directly instructs the pressure control module to work in cooperation with the pressure control pump through the control hub, replaces the operation mode of the traditional manual rotation of the pressure adjusting knob, eliminates subjective errors and operation fatigue caused by repeated manual operation and observation of instrument readings in the pressure value setting link, and thus realizes automatic adjustment and control in the calibration process, effectively improves the calibration efficiency and calibration accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a perspective view of the calibration device and the air tightness leak detector of the present application;

[0024] Figure 2 It is a schematic diagram of gas path connection of the calibration device of the present application;

[0025] Figure 3 It is an enlarged schematic diagram of the pressure control module of the calibration device of the present application;

[0026] Figure 4 It is a schematic diagram of circuit connection of the calibration device of the present application;

[0027] Figure 5 It is a schematic diagram of equivalent gas path connection of the calibration device of the present application in the direct pressure calibration mode;

[0028] Figure 6 It is a schematic diagram of equivalent gas path connection of the calibration device of the present application in the differential pressure calibration mode;

[0029] Figure 7 It is a schematic diagram of equivalent gas path connection of the calibration device of the present application in the leak rate calibration mode.

[0030] Reference numerals: 100, air tightness leak detector; 110, reference port; 120, reference port; 130, air inlet; 140, display screen; 150, serial port interface;

[0031] 10, housing; 11, first interface; 12, second interface; 13, third interface; 20, pressure control assembly; 21, pressure control module; 211, pressure control base; 212, valve rod; 212a, flexible partition; 212b, connecting block; 212c, connecting rod; 212d, spring; 213, baffle; 214, valve block; 215, pressure control top base; 215a, first chamber; 215b, second chamber; 216, pressure compensation air pump; 217, pressure stabilizing air tank; 218, pressure control processor; 219, sealing packing; 220, pressure gauge; 22, pressure control pump; 30, pressure gauge; 31, pressure gauge control valve; 40, control center; 51, standard leak hole; 52, leak hole control valve; 60, volume tank assembly; 61, standard volume tank; 62, volume tank control valve; 70, camera module; 81, first control valve; 82, second control valve; 83, third control valve; 84, fourth control valve; 85, fifth control valve; 86, sixth control valve. DETAILED DESCRIPTION

[0032] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than the embodiments described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0034] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly and specifically limited.

[0035] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", and "fixedly" should be construed as broad terms, for example, it can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal communication of two elements, or interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0037] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a mediating element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be a mediating element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.

[0038] For the convenience of understanding, in the flow connection diagram and the circuit connection diagram of the drawings of the present application, the flow connection is represented by solid lines, and the circuit connection is represented by dashed lines.

[0039] Please refer to Figure 1 , Figure 2 and Figure 3As shown, the present application first provides a calibration device for calibrating the air tightness leak detector 100, comprising: a shell 10, provided with a first interface 11, a second interface 12 and a third interface 13, one end of the three interfaces is used for connecting the reference port 110, the reference port 120 and the gas inlet 130 of the air tightness leak detector 100 in turn, wherein the other end of the third interface 13 can be connected with the outside or disconnected; a pressure control assembly 20, comprising a pressure control module 21 and a pressure control pump 22 arranged in the shell 10, one end of the pressure control module 21 is communicated with the pressure control pump 22, and the other end can be communicated with the first interface 11 or the second interface 12, the pressure control pump 22 is used for gas supply, and the pressure control module 21 is used for adjusting the gas pressure; a pressure gauge 30 arranged outside the shell 10 and used for detecting the gas pressure of the second interface 12; a control center 40 electrically connected with the pressure control module 21, the control center 40 is used for controlling the pressure control module 21 to adjust the gas pressure to the required pressure, and the required pressure is calculated by the control center 40 according to the input parameters and the preset program.

[0040] In the present application, the control center 40 directly instructs the pressure control module 21 and the pressure control pump 22 to work cooperatively, which replaces the traditional manual rotation of the pressure regulating knob, eliminates the subjective error and operation fatigue caused by repeated manual operation and instrument reading in the pressure value setting link, and thus realizes the automatic adjustment and control in the calibration process, effectively improves the calibration efficiency and calibration accuracy.

[0041] Specifically, in the present application, the core elements such as the pressure control assembly 20, the pressure gauge 30 and the control center 40 are integrated in the single shell 10, and a standardized quick connection path is provided through the first interface 11 (connecting the reference port 110), the second interface 12 (connecting the reference port 120) and the third interface 13 (connecting the gas inlet 130) arranged on the shell 10;

[0042] The operator only needs to connect the ports of the air tightness leak detector 100 with the interfaces on the shell 10 in correspondence, and input parameters into the control center 40, which simplifies the on-site operation process and improves the calibration efficiency; then the control center 40 can automatically calculate the required pressure according to the input parameters and the preset program, and control the pressure control module 21 to adjust the gas pressure and control the pressure control pump 22 to provide a suitable gas source, so that the output gas pressure of the pressure control module 21 is the same as the required pressure, realizing automatic pressure regulation.

[0043] More specifically, the input parameters in the present application refer to the measurement range of calibration parameters such as direct pressure, differential pressure and leakage rate, and the preset program refers to the calculation program recorded in the control center 40 in advance, which can automatically calculate according to the input parameters, and the preset program can automatically calculate the required pressure according to the input parameters.

[0044] In some embodiments, the calibration device further comprises a first control valve 81, a second control valve 82 and a third control valve 83 electrically connected with the control hub 40, one end of the first control valve 81 is in communication with the first interface 11, and the other end is in communication with the pressure control module 21, one end of the second control valve 82 is connected to the gas path between the first control valve 81 and the pressure control module 21, and the other end is in communication with the second interface 12 and the pressure gauge 30 at the same time; one end of the third control valve 83 is in communication with the third interface 13, and the other end is in communication with the outside world;

[0045] It is not difficult to understand that by controlling the opening and closing of the first control valve 81 and the second control valve 82 through the control hub 40, the other end of the pressure control module 21 can be communicated with the first interface 11 or the second interface 12; by controlling the opening and closing of the third control valve 83 through the control hub 40, the other end of the third interface 13 can be communicated with the outside world or disconnected; that is, by controlling the opening and closing of the first control valve 81, the second control valve 82 and the third control valve 83 through the control hub 40, the calibration requirements of different parameters such as direct pressure and differential pressure can be realized.

[0046] Further, in some embodiments, in the direct pressure calibration mode, the first control valve 81 is opened, the second control valve 82 is closed, and the third control valve 83 is closed; in the differential pressure calibration mode, the first control valve 81 is closed, the second control valve 82 is opened, and the third control valve 83 is opened.

[0047] Please refer to Figure 2 and Figure 4 In some embodiments, the control hub 40 is also electrically connected with the pressure gauge 30, for adjusting the air pressure of the pressure control module 21 to the required pressure according to the feedback air pressure, and the feedback air pressure is the air pressure detected by the pressure gauge 30.

[0048] By electrically connecting the control hub 40 with the pressure gauge 30, the control hub 40 can obtain the feedback air pressure of the second interface 12 measured by the pressure gauge 30 in real time, that is, the actual output air pressure of the pressure control module 21;

[0049] It is not difficult to understand that under normal circumstances, the air pressure output by the pressure control module 21 after adjustment by the control hub 40 should be equal to the required air pressure, but inevitably in some cases, the actual output air pressure of the pressure control module 21 may still deviate;

[0050] Therefore, by continuously comparing the feedback pressure monitored by the pressure gauge 30 with the required air pressure through the control hub 40, it can be determined whether there is a deviation in the actual output air pressure, and after detecting the deviation, the pressure control module 21 is controlled according to the deviation value to dynamically adjust the actual output of the pressure control module 21, so that the actual air pressure applied to the second interface 12 is accurately stabilized and maintained at the target value (required pressure), greatly improving the accuracy, stability and repeatability of pressure regulation.

[0051] The feedback pressure detected by pressure gauge 30 realizes closed-loop feedback control, which effectively solves the problems of deviation and limited accuracy that may exist in the automatic pressure control process, and ensures that the pressure applied to the reference port 120 can be accurately and stably maintained at the required pressure.

[0052] Please refer to Figure 3 As shown, in some embodiments, the pressure control module 21 includes a pressure control base 211, a valve stem 212, and a drive module. One end of the pressure control base 211 is connected to the pressure control pump 22, and the other end can be connected to the first interface 11 or the second interface 12. The valve stem 212 extends through the pressure control base 211. The drive module is used to drive the valve stem 212 to move, so as to change the flow area in the pressure control base 211.

[0053] With a constant air flow rate, the flow area within the pressure control base 211 can be changed by moving the valve stem 212, thereby altering the air pressure passing through the pressure control base 211. This lays the foundation for achieving precise and repeatable pressure control, which is more accurate and stable than relying solely on pump speed or valve switching control.

[0054] In some embodiments, the drive module drives the valve stem 212 to move, which can be a combination of movements such as moving, rotating or other movements including but not limited to moving and rotating. As long as the flow area in the pressure control base 211 can be changed, this application will not give examples of each.

[0055] Please refer to Figure 3 As shown, in some embodiments, a baffle 213 with an S-shaped cross-section is fixed inside the pressure control base 211, which blocks both ends. The baffle 213 has a through groove with a trapezoidal cross-section. A valve block 214 with a triangular cross-section is fixed at the end of the valve stem 212, which corresponds to the through groove. The drive module is used to drive the valve stem 212 to move along its length to control the flow area between the valve block 214 and the through groove.

[0056] Among them, the S-shaped baffle 213 serves as a fixed guide component, which optimizes the generation and control of disturbances in the airflow field. The trapezoidal cross-section groove on the baffle 213 serves as a channel for airflow to pass through the baffle 213. The triangular cross-section valve block 214 is fixed to the end of the valve stem 212, and its shape strictly corresponds and matches the groove.

[0057] Specifically, when the drive module drives the valve stem 212 along its length direction (with... Figure 3 For example, when the longitudinal reciprocating motion occurs, the relative position between the fixed trapezoidal through groove and the triangular valve block 214 that moves synchronously with the valve stem 212 changes, thereby changing the flow area accordingly.

[0058] More specifically, the through-flow area changes in a highly controllable and nearly linear manner with the displacement of the valve stem 212 during the insertion and extraction of the triangular block into the trapezoidal through-slot, and the dynamic cooperation of this specific geometry enables the through-flow area to change from zero to gradually increasing in a fine manner within a short displacement stroke, thereby providing extremely high micro-pressure adjustment resolution and stability.

[0059] Of course, in other embodiments, the cross-section of the baffle 213, the through-slot, and the valve block 214 can also have other structures, which are not exemplified one by one herein.

[0060] Please refer to Figure 3 As shown in some embodiments, the pressure control base 211 is fixed with a pressure control top seat 215 at the top, and the valve stem 212 is located in the pressure control top seat 215, which divides the pressure control top seat 215 into a first chamber 215a and a second chamber 215b, and the driving module is used to supply gas to the first chamber 215a or the second chamber 215b to control the valve stem 212.

[0061] Specifically, by fixing the pressure control top seat 215 at the top of the pressure control base 211 and designing it to be divided into two independent air chambers (i.e., the first chamber 215a and the second chamber 215b) by the valve stem 212, the gas pressure difference is directly used as the driving force to move the valve stem 212, rather than using motor torque or large cylinder piston force as the driving force. Compared with using motor torque or cylinder piston force as the driving force, the gas pressure difference driving method of the present application is small in size, light in weight, and free of complex transmission mechanism, which meets the design requirement of miniaturization.

[0062] More specifically, the driving module only needs to control the gas supply (pressurization) or exhaust (depressurization) of any air chamber in the first chamber 215a or the second chamber 215b, and in cooperation with the other side air chamber, the valve stem 212 can be accurately and quickly pushed or pulled for axial movement.

[0063] It is worth mentioning that since compressed gas itself has the advantages of high flowability and low inertia, when the driving module accurately adjusts the gas flow into / out of the air chamber, the pressure change in the air chamber can be almost instantaneously transmitted to the two side end faces of the valve stem 212 to generate the required driving displacement force.

[0064] That is, compared with the mechanical inertia and delay of motor start / stop / rotation, the gas pressure difference driving has extremely high response speed of starting and stopping action, i.e., extremely high sensitivity, which can cooperate with the above-mentioned closed-loop feedback control system to realize instant and dynamic gas pressure control, further improving the accuracy of the input gas pressure and improving the calibration accuracy.

[0065] In some embodiments, the valve rod 212 comprises a flexible partition 212a fixed inside the pressure control top seat 215 to divide the inner space thereof into a first chamber 215a and a second chamber 215b, a connecting block 212b fixed to the flexible partition 212a, a connecting rod 212c fixed to the connecting block 212b, and a spring 212d sleeved on the connecting rod 212c and fixed at one end to the connecting block 212b and at the other end to the inner wall of the pressure control top seat 215.

[0066] In some embodiments, a sealing filler 219 is further fixed between the pressure control top seat 215 and the pressure control bottom seat 211, and the connecting rod 212c penetrates through the sealing filler 219 to avoid gas pressure leakage.

[0067] Please refer to Figure 3 In some embodiments, the driving module comprises a pressure compensation air pump 216, a pressure stabilizing air tank 217, four pressure gauges 220, and a pressure control processor 218. The pressure stabilizing air tank 217 is in communication with the first chamber 215a, the pressure compensation air pump 216 is in communication with the pressure stabilizing air tank 217, the four pressure gauges 220 are respectively used for detecting the gas pressures at the first chamber 215a, the second chamber 215b, and the two ends of the pressure control bottom seat 211, the pressure compensation air pump 216 and the four pressure gauges 220 are electrically connected to the pressure control processor 218, and the pressure control processor 218 is electrically connected to the control hub 40.

[0068] For ease of description, it is assumed that the gas pressure measured by the pressure gauge 220 on the gas inlet side (i.e., close to the pressure control pump 22) of the pressure control bottom seat 211 is P1, the gas pressure measured by the pressure gauge 220 at the second chamber 215b is P2, the gas pressure measured by the pressure gauge 220 at the first chamber 215a is P3, and the gas pressure measured by the pressure gauge 220 on the gas outlet side (i.e., close to the first interface 11) of the pressure control bottom seat 211 is P4.

[0069] Specifically, the distance L between the valve block 214 and the inner wall of the through slot along the length direction of the valve rod 212 satisfies:

[0070] L= ,

[0071] In addition, the gas pressure P4 measured by the pressure gauge 220 on the gas outlet side of the pressure control bottom seat 211 satisfies:

[0072] P4= ,

[0073] wherein k is a compression factor and q is a leakage rate factor.

[0074] Since k and q are constants, after the control center 40 calculates the required pressure, the pressure control processor 218 can adjust the values of P2 and P3 by controlling the pressure compensation air pump 216 and the pressure stabilizing tank 217, and can adjust the value of P1 by controlling the pressure control pump 22, that is, the pressure control processor 218 can control the values of P1, P2 and P3 to make P4 the same as the required pressure, thereby meeting the demand for automatic pressure regulation.

[0075] The air pressures at the key nodes of the four pressure gauges 220 enable the pressure control processor 218 to accurately grasp the internal air pressure state distribution and input / output dynamics of the entire actuator.

[0076] It is worth mentioning that the pressure stabilizing tank 217, as a buffer and energy storage container, is directly communicated with the first chamber 215a, and the pressure compensation air pump 216 is used to maintain the stability and setting of the pressure in the pressure stabilizing tank 217; wherein, the setting of the pressure stabilizing tank 217 suppresses the pulse fluctuation of the pressure compensation air pump 216, so that the air source directly supplied to the first chamber 215a has high stability; in addition, when it is necessary to quickly adjust the position of the valve rod 212, the pressure stabilizing tank 217 can instantaneously release or absorb sufficient flow of gas, greatly improving the response speed of the system to the change of the chamber pressure.

[0077] Please refer to Figure 2 and Figure 4 In some embodiments, the calibration device includes a plurality of pressure gauges 30 with different ranges, each pressure gauge 30 is communicated with the second interface 12 through a corresponding pressure gauge control valve 31; the control center 40 is electrically connected with each pressure gauge control valve 31 to control the opening and closing of each pressure gauge control valve 31 according to the input parameters and the preset program.

[0078] In this application, by configuring a plurality of pressure gauges 30 with different ranges, the complete measurement range from very low pressure to high pressure is covered, solving the problem of limited range or precision of a single pressure gauge 30.

[0079] Further, the configuration of the pressure gauge control valve 31 gives the control center 40 the selection ability, that is, the control center 40 can calculate the measured pressure value according to the input parameters and the preset program, and accurately control the opening and closing state of each pressure gauge control valve 31 according to the calculated value to select the appropriate range of the pressure gauge 30; thereby ensuring that at each calibration pressure point, the system can automatically use the pressure gauge 30 within its optimal precision range (usually in the middle and high range) for measurement, significantly improving the overall pressure measurement accuracy and reliability of the entire calibration.

[0080] In addition, each pressure gauge 30 is configured with a separate pressure gauge control valve 31, which can automatically close the pressure gauge control valve 31 of the low-range pressure gauge 30 when high-pressure calibration is performed, strictly isolating its gas circuit, and completely avoiding the risk of damage to the low-range pressure gauge 30 due to overpressure.

[0081] In some embodiments, the calibration device includes five pressure gauges 30 of different ranges.

[0082] Referring to Figure 2 In some embodiments, the calibration device further includes a standard leak hole 51 and a standard volume tank 61, the standard leak hole 51 being capable of communicating with the third interface 13, and the standard volume tank 61 being capable of communicating with the second interface 12, to meet the needs of leak rate calibration.

[0083] Referring to Figure 2 and Figure 4 In some embodiments, the calibration device further includes a plurality of standard leak holes 51 of different leak rates and two sets of identical volume tank assemblies 60, each set of volume tank assemblies 60 including a plurality of standard volume tanks 61 of different capacities, each standard leak hole 51 communicating with the third interface 13 through a corresponding leak hole control valve 52, and each standard volume tank 61 communicating with the second interface 12 through a corresponding volume tank control valve 62; the control hub 40 is electrically connected with each leak hole control valve 52 and volume tank control valve 62, to control the opening and closing of each leak hole control valve 52 and volume tank control valve 62 according to input parameters and preset programs.

[0084] Specifically, the calibration device further includes a fourth control valve 84, a fifth control valve 85, and a sixth control valve 86 electrically connected with the control hub 40, one end of the fourth control valve 84 communicating with the third control valve 83 and the other end communicating with the outside, one end of the fifth control valve 85 communicating with the second interface 12 and the other end being divided into two paths, one path communicating with the volume tank control valve 62 of one set of volume tank assemblies 60 and the other path communicating with the sixth control valve 86, and the other end of the sixth control valve 86 communicating with the volume tank control valve 62 of the other set of volume tank assemblies 60.

[0085] More specifically, referring to Figure 2 and Figure 5 In the direct pressure calibration mode, the first control valve 81 is open, the second control valve 82 is closed, the third control valve 83 is closed, and the fifth control valve 85 is closed.

[0086] Referring to Figure 2 and Figure 6 In the differential pressure calibration mode, the first control valve 81 is closed, the second control valve 82 is open, the third control valve 83 is open, the fourth control valve 84 is open, each leak hole control valve 52 is closed, and the fifth control valve 85 is closed.

[0087] Referring toFigure 2 and Figure 7 As shown in FIG. 8, in the leak rate calibration mode, the first control valve 81 is opened, the second control valve 82 is closed, the third control valve 83 is opened, the fourth control valve 84 is closed, each leak hole control valve 52 is opened, the fifth control valve 85 is opened, and the sixth control valve 86 is opened.

[0088] By configuring a plurality of standard leak holes 51 with different leak rates and two groups of volumetric tank assemblies 60 with the same structure (each group includes a plurality of standard volumetric tanks 61 with different capacities), and each standard device (standard leak hole 51 and standard volumetric tank 61) is connected to the interface (second interface 12 or third interface 13) through a dedicated control valve (leak hole control valve 52 and volumetric tank control valve 62), so that the control center 40 can intelligently select the matching standard device based on the input parameters and the preset program, thereby automatically controlling the opening and closing state of the corresponding control valve, and accurately connecting the target standard device to the main gas path (the rest is kept isolated) as needed, completely eliminating manual switching operations, thereby making the stability of the calibration result more optimal and the calibration accuracy higher.

[0089] Among them, the two groups of the same volumetric tank assemblies 60 mean that the standard volumetric tanks 61 with different capacities in the two groups of volumetric tank assemblies 60 correspond one by one and have the same capacity.

[0090] In some embodiments, the calibration device includes three standard leak holes 51 with different leak rates, and each of the two groups of volumetric tank assemblies 60 includes three standard volumetric tanks 61 with different capacities.

[0091] Please refer to Figure 1 and Figure 4 In some embodiments, the shell 10 is also provided with a fourth interface for connecting with the serial interface 150 of the air tightness leak detector 100 and a camera module 70, and the fourth interface and the camera module 70 are electrically connected with the control center 40.

[0092] For the air tightness leak detector 100 with the serial interface 150, connecting the fourth interface with the serial interface 150 can transmit the data detected in the air tightness leak detector 100 during the calibration process to the control center 40, that is, the control center 40 can directly obtain the calibration data (such as direct pressure, differential pressure, leak rate, etc.) output by the air tightness leak detector 100 supporting digital communication;

[0093] For the airtight leak detector 100 without a serial interface 150, the detection data displayed on the display screen 140 of the airtight leak detector 100 is captured by the camera module 70, and the data is processed and transmitted to the control hub 40, that is, the calibration device of the present application can capture the key calibration feedback data displayed by the airtight leak detector 100 itself through the camera module 70 when the airtight leak detector 100 cannot or does not support digital communication (such as no serial port or protocol incompatibility).

[0094] The combination of the data acquisition strategy completely overcomes the fundamental pain point that the communication protocol cannot be unified due to the large number of brands / models, and ensures that the key feedback data generated by the airtight leak detector 100 of any brand / model during the calibration process can be automatically collected and entered into the control hub 40, realizing full automation of the test-data recording closed loop.

[0095] In some embodiments, the automatic calibration of the calibration device of the present application is as follows:

[0096] 1. Input or import input parameters (direct pressure, differential pressure, and parameter measurement range of leak rate) into the control hub 40;

[0097] 2. The control hub 40 calculates the required pressure for each stage according to the input parameters;

[0098] 3. The calibration device is adjusted to the direct pressure calibration mode, the control hub 40 selects the appropriate pressure gauge 30 according to the range and opens the corresponding pressure gauge control valve 31, changes the P4 pressure to obtain the measured direct pressure value at different points;

[0099] 4. The calibration device is adjusted to the differential pressure calibration mode, the control hub 40 selects the appropriate pressure gauge 30 according to the range and opens the corresponding pressure gauge control valve 31, changes the P4 pressure to obtain the measured differential pressure value at different points;

[0100] 5. The calibration device is adjusted to the leak rate calibration mode, the corresponding standard volume tank 61 and standard leak hole 51 are selected according to the leak rate point and the corresponding volume tank control valve 62 and leak hole control valve 52 are opened; control P4 to make the pressure value to the required pressure, start the airtight leak detector 100 to obtain the detected value;

[0101] 6. When the airtight leak detector 100 has a serial data output function, the data is recorded to the control hub 40 through the fourth interface, and when the airtight leak detector 100 does not have a serial data output function, the data is recorded to the control hub 40 after being captured and processed by the camera module 70.

[0102] Among them, steps 3, 4, and 5 can be adjusted in order or select part of the steps according to actual needs, which are not exemplified one by one in the present application.

[0103] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as the combination of the technical features does not exist in contradiction, it shall be considered within the scope of the present disclosure.

[0104] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent scope of the present application. It shall be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A calibration device for calibrating an airtight leak detector (100), characterized in that, include: The housing (10) is provided with a first interface (11), a second interface (12) and a third interface (13). One end of the three interfaces is used to connect to the reference port (110), the reference port (120) and the air inlet (130) of the airtight leak detector (100) in sequence. The other end of the third interface (13) can be connected to or disconnected from the outside. The pressure control assembly (20) includes a pressure control module (21) and a pressure control pump (22) disposed in the housing (10). One end of the pressure control module (21) is connected to the pressure control pump (22), and the other end can be connected to the first interface (11) or the second interface (12). The pressure control pump (22) is used to supply air, and the pressure control module (21) is used to regulate the air pressure. A pressure gauge (30) is disposed outside the housing (10) and is used to detect the air pressure of the second interface (12); The control center (40) is electrically connected to the pressure control module (21). The control center (40) is used to control the pressure control module (21) to adjust the air pressure to the required pressure. The required pressure is calculated by the control center (40) based on the input parameters and the preset program. The pressure control module (21) includes a pressure control base (211), a valve stem (212), and a drive module. One end of the pressure control base (211) is connected to the pressure control pump (22), and the other end can be connected to the first interface (11) or the second interface (12). The valve stem (212) extends through the pressure control base (211). The drive module is used to drive the valve stem (212) to move, so as to change the flow area in the pressure control base (211). The pressure control base (211) has a pressure control top seat (215) fixed on top. The valve stem (212) is located on the pressure control top seat (215), which divides the pressure control top seat (215) into a first chamber (215a) and a second chamber (215b). The drive module is used to supply air to the first chamber (215a) or the second chamber (215b) to control the valve stem (212).

2. The calibration device according to claim 1, characterized in that, The control center (40) is also electrically connected to the pressure gauge (30) and is used to control the pressure control module (21) to adjust the pressure to the required pressure according to the feedback pressure. The feedback pressure is the pressure detected by the pressure gauge (30).

3. The calibration device according to claim 1, characterized in that, The pressure control base (211) has a baffle (213) with an S-shaped cross-section that blocks both ends. The baffle (213) has a through groove with a trapezoidal cross-section. The valve stem (212) has a valve block (214) with a triangular cross-section that corresponds to the through groove. The drive module is used to drive the valve stem (212) to move along its length to control the flow area between the valve block (214) and the through groove.

4. The calibration device according to claim 1, characterized in that... The drive module includes a pressure-replenishing air pump (216), a pressure-stabilizing air tank (217), four pressure gauges (220), and a pressure control processor (218). The pressure-stabilizing air tank (217) is connected to the first chamber (215a), and the pressure-replenishing air pump (216) is connected to the pressure-stabilizing air tank (217). The four pressure gauges (220) are used to detect the air pressure at both ends of the first chamber (215a), the second chamber (215b), and the pressure control base (211). The pressure-replenishing air pump (216) and the four pressure gauges (220) are electrically connected to the pressure control processor (218), and the pressure control processor (218) is electrically connected to the control center (40).

5. The calibration device according to claim 1, characterized in that, The calibration device includes multiple pressure gauges (30) with different ranges, and each pressure gauge (30) is connected to the second interface (12) through a corresponding pressure gauge control valve (31); The control center (40) is electrically connected to each of the pressure gauge control valves (31) to control the opening and closing of each of the pressure gauge control valves (31) according to the input parameters and the preset program.

6. The calibration apparatus according to claim 1, characterized in that, The calibration device also includes a standard leak (51) and a standard volume container (61), the standard leak (51) being able to communicate with the third interface (13), and the standard volume container (61) being able to communicate with the second interface (12).

7. The calibration apparatus according to claim 6, characterized in that, The calibration device also includes multiple standard leak holes (51) with different leak rates and two sets of identical volume tank assemblies (60). Each set of volume tank assemblies (60) includes multiple standard volume tanks (61) with different capacities. Each standard leak hole (51) is connected to the third interface (13) through a corresponding leak hole control valve (52), and each standard volume tank (61) is connected to the second interface (12) through a corresponding volume tank control valve (62). The control center (40) is electrically connected to each of the leakage control valves (52) and the volume tank control valve (62) to control the opening and closing of each of the leakage control valves (52) and the volume tank control valve (62) according to the input parameters and the preset program.

8. The calibration apparatus according to claim 1, characterized in that, The housing (10) is also provided with a fourth interface for connecting to the serial port interface (150) of the airtight leak detector (100) and a camera module (70), the fourth interface and the camera module (70) being electrically connected to the control center (40).

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