Double-channel air tightness detection machine core

Abstract

The utility model relates to the technical field of air tightness detection equipment, in particular to a double-channel air tightness detection machine core, which comprises a substrate, a detection module, a detection driving unit arranged on the substrate and a multi-way connector fixed on the substrate, and the multi-way connector is sequentially communicated with a benchmarking valve, a pressure detection standard component and a benchmarking sensor. The detection driving unit comprises a pressure regulating valve, a switch valve, a first three-way valve, a second three-way valve, a third three-way valve and a differential pressure sensor which are sequentially communicated through hoses, the head end of the pressure regulating valve is connected with an air source interface, the tail end of the pressure regulating valve is communicated with the head end of the switch valve, and the tail end of the switch valve is communicated with the R end of the first three-way valve; two ends of the differential pressure sensor are respectively communicated with the tail end of the pressure regulating valve and the end A of the third three-way valve. The double-channel air tightness detection machine core has the advantages of positive pressure air tightness detection and negative pressure air tightness detection on the premise that hardware equipment does not need to be replaced.

Description

TECHNICAL FIELD

[0001] The utility model relates to airtightness detection equipment technical field especially is a double -channel airtightness detection machine core. BACKGROUND

[0002] Common airtightness detection methods include direct pressure testing and differential pressure testing. Direct pressure testing involves filling a measured object with a certain pressure of compressed gas through an instrument, stabilizing the pressure, and then detecting the pressure drop or leakage amount over a period of time using a pressure sensor to determine the airtightness and sealing of the measured object. The principle of direct pressure testing is based on the molecular motion theory and equation of state of gas. Specifically, it compares the pressure difference inside the measured object before and after inflation to determine its gas tightness and calculate the leakage amount. Differential pressure testing adds a differential pressure sensor to the direct pressure testing method for detection. During testing, the same pressure of gas is first filled into a reference object without leakage and the measured object, and their inflation gases are connected. After the pressure stabilizes, the gases of the measured object and the reference object are separated, and then the pressure difference between the two objects is tested using a differential pressure sensor to determine whether the gas tightness of the measured object is qualified.

[0003] The principle of differential pressure testing is based on the force balance relationship caused by the pressure difference of fluid. According to Pascal's law, the pressure of fluid on any surface is equal when the fluid is stationary. However, when the fluid starts to flow, the pressure on different surfaces will differ due to changes in flow rate and pipe shape. A differential pressure sensor usually consists of two measurement units connected to the measured medium, and the flow rate, flow, and other parameters are calculated based on the pressure difference measured by the sensor, so that small leaks can be detected.

[0004] Differential pressure testing generally has higher precision and sensitivity and can detect smaller leaks. While direct pressure testing is simple to operate, it may not be accurate enough when detecting small leaks. Direct pressure testing is relatively simple to operate and does not require additional reference objects or complex equipment connections. However, differential pressure testing requires a reference object and ensures that the pressure between the two is stable and connected, which is relatively complex to operate.

[0005] Direct pressure testing is suitable for situations where the airtightness requirement is not particularly high, such as airtightness testing of general industrial products. Differential pressure testing is more suitable for situations where airtightness requirements are high, such as airtightness testing of precision instruments and electronic products.

[0006] However, there is no solution on the market that can achieve airtightness detection under positive and negative pressure without replacing hardware equipment, making it difficult to meet the needs of both positive and negative airtightness detection. SUMMARY

[0007] The utility model wants to solve the technical problem to provide a kind of dual-channel air-tightness detection machine core, which considers positive pressure air-tightness detection and negative pressure air-tightness detection under the premise of not needing to replace hardware equipment.

[0008] To solve the above technical problems, the utility model adopts the following technical solutions: a dual-channel air-tightness detection machine core, comprising a substrate, a detection module, a detection driving unit installed on the substrate, and a multi-port connector fixed to the substrate, the multi-port connector is sequentially communicated with a reference valve, a pressure detection standard piece and a reference sensor, characterized in that: the detection driving unit comprises a pressure regulating valve, a switch valve, a first three-way valve, a second three-way valve, a third three-way valve and a differential pressure sensor connected in sequence through a hose, the first end of the pressure regulating valve is connected with a gas source interface, the tail end of the pressure regulating valve is communicated with the first end of the switch valve, the tail end of the switch valve is communicated with the R end of the first three-way valve, the P end and the A end of the first three-way valve are respectively communicated with the P end of the third three-way valve and the R end of the second three-way valve, the A end and the P end of the second three-way valve are respectively communicated with the multi-port connector and the R end of the third three-way valve, and the two ends of the differential pressure sensor are respectively communicated with the tail end of the pressure regulating valve and the A end of the third three-way valve.

[0009] Preferably, the detection module comprises a fourth three-way valve, a four-port connector and a CH detection interface connected in sequence, the four-port connector is connected with a CH sensor and a terminal valve, and the A end and the P end of the fourth three-way valve are respectively connected with the multi-port connector and the four-port connector.

[0010] Preferably, the number of detection modules is at least two, and the A end of the fourth three-way valve in the at least two detection modules is communicated with the multi-port connector.

[0011] Preferably, the first end of the pressure regulating valve is connected with a gas pressure detection and display device for detecting the gas pressure at the gas source interface and displaying the gas pressure value.

[0012] Preferably, the pipe where the P end of the third three-way valve and the R end of the second three-way valve are communicated is provided with a detection interface.

[0013] Preferably, it further comprises a fifth three-way valve, the A end and the P end of the fifth three-way valve are respectively communicated with the A end of the second three-way valve and the multi-port connector through a hose.

[0014] The utility model discloses a beneficial effect lies in: the utility model provides a double -channel air -tightness detection machine core, in the assembly process of actual air -tightness equipment, pressure regulating valve, switch valve, first three -way valve, second three -way valve, third three -way valve, differential pressure sensor and all three -way valve are connected with the wiring board electricity of control host computer. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is the three -dimensional structure schematic diagram of the utility model air -tightness detection machine core.

[0016] Fig. 2 It is the three -dimensional structure schematic diagram of the utility model air -tightness detection machine core another view.

[0017] Fig. 3 It is the air -road structure schematic diagram of the utility model air -tightness detection machine core. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of the person skilled in the art, the utility model is further explained below in conjunction with examples, and the content mentioned in the implementation is not the limitation of the utility model.

[0019] As Figs. 1 to 3As shown, a double-channel air tightness detection machine core includes a substrate 1, a detection module, a detection driving unit installed on the substrate 1, and a multi-port connector 4 fixed to the substrate 1, the multi-port connector 4 is sequentially communicated with a standard valve 41, a pressure detection standard piece 42 and a standard sensor 43, the detection driving unit includes a pressure regulating valve 31, a switch valve 32, a first three-way valve 33, a second three-way valve 34, a third three-way valve 35 and a differential pressure sensor 36 sequentially communicated through a hose, the first end of the pressure regulating valve 31 is connected with a gas source interface 37, the tail end of the pressure regulating valve 31 is communicated with the first end of the switch valve 32, the tail end of the switch valve 32 is communicated with the R end of the first three-way valve 33, the P end and the A end of the first three-way valve 33 are respectively communicated with the P end of the third three-way valve 35 and the R end of the second three-way valve 34, the A end and the P end of the second three-way valve 34 are respectively communicated with the multi-port connector 4 and the R end of the third three-way valve 35, and the two ends of the differential pressure sensor 36 are respectively communicated with the tail end of the pressure regulating valve 31 and the A end of the third three-way valve 35.

[0020] In the actual assembly process of the air tightness equipment, the pressure regulating valve 31, the switch valve 32, the first three-way valve 33, the second three-way valve 34, the third three-way valve 35, the differential pressure sensor 36 and all the three-way valves are electrically connected with the wiring board of the control host. In the detection process, the gas source interface 37 is communicated with the external gas source equipment such as the air compressor or the gas tank, the detection module is sealingly connected with the gas pressure detection port of the product to be detected, the control host controls the opening and closing of each valve, first inflates or pumps the product to be detected, and then closes the switch valve 32 and the corresponding three-way valve after reaching the set pressure value, and maintains this state until the pressure holding set time is reached. By comparing the detection parameters of the standard sensor 43 and the detection module, it is determined whether the air tightness of the product to be detected meets the requirements, thereby determining whether the product leaks, which has the advantages of convenient use and high detection accuracy. Through the opening and closing control of each electromagnetic valve, the double-channel detection of positive pressure and negative pressure can be realized, and the detection needs can be met without replacing the hardware detection equipment or parts, which has strong practicality.

[0021] In this embodiment, the detection module includes a fourth three-way valve 21, a four-port connector 22 and a CH detection interface 30 sequentially communicated, the four-port connector 22 is connected with a CH sensor 23 and a terminal valve 3, and the A end and the P end of the fourth three-way valve 21 are respectively connected with the multi-port connector 4 and the four-port connector 22. In the actual detection process, the CH detection interface 30 is sealingly connected with the gas pressure detection port of the product to be detected, which can be installed by using the existing special tool on the market, and is not the technical key point of the present application, which will not be described here.

[0022] In the embodiment, the number of detection modules is two, the A end of the fourth three-way valve 21 in the two detection modules is communicated with the multi-way connector 4, if the same specification of two products can be simultaneously detected for air tightness, the detection efficiency is improved, and the practicality is stronger.

[0023] It should be noted that: the number of detection modules can also be more than three, the A end of the fourth three-way valve 21 in the detection module is communicated with the multi-way connector 4, in actual application, a plurality of products of corresponding specifications can be simultaneously detected for air tightness, the detection efficiency is further improved, and it is especially suitable for occasions with small sealed space and large detection quantity, such as small electronic product fields of mobile phones, tablets, cameras of vehicle recorders and the like.

[0024] In the embodiment, the first end of the pressure regulating valve 31 is connected with a gas pressure detection and display device 38 for detecting the gas pressure at the gas source interface 37 and displaying the gas pressure value, so that the gas pressure supplied by the external gas source equipment can be detected and regulated, and the gas pressure entering the air tightness detection equipment of the application meets the set requirements, is safe and reliable, and is high in security.

[0025] In the embodiment, the pipeline in which the P end of the third three-way valve 35 and the R end of the second three-way valve 34 are communicated is provided with a detection interface 3A, which is in a closed state in a normal use state, and the detection interface 3A can be used to overhaul and correct the air tightness detection equipment after being used for a period of time, so that maintenance is facilitated.

[0026] In the embodiment, a fifth three-way valve 39 is further included, the A end and the P end of the fifth three-way valve 39 are respectively communicated with the A end of the second three-way valve 34 and the multi-way connector 4 through a hose, so that the internal passage of the detection equipment can be further controlled by the auxiliary control host, and the detection driving unit and the detection module can be respectively maintained and overhauled by cooperating with a corresponding equipment overhaul method, and the overhaul efficiency of the air tightness detection equipment is improved.

[0027] In the inflation process of the positive pressure air tightness detection, the pressure regulating valve 31 and the on-off valve 32 are opened, the first three-way valve 33, the second three-way valve 34 and the third three-way valve 35 are all opened, the P end is closed, the fifth three-way valve 39 and the reference three-way valve are opened at the A end and the P end, the R end is closed, the fourth three-way valve 21 and the end valve 3 are all closed, and the measured product is inflated; when the CH sensor 23 detects that the gas pressure value in the measured product reaches the design pressure maintaining value, the pressure regulating valve 31 and the on-off valve 32 are closed, the CH sensor 23 is used to detect the gas pressure of the four-way connector 22 and the measured product connected with the four-way connector 22, the control host is convenient to judge whether the air tightness of the measured product is qualified according to the detection data, the detection speed is fast, and the accuracy is high.

[0028] In the air extraction process of the negative pressure air tightness detection, first, open the pressure regulating valve 31 and the switch valve 32, the first three-way valve 33, the second three-way valve 34 and the third three-way valve 35 are all opened, the P end is closed, the fifth three-way valve 39 and the opposite three-way valve are opened at the A end and the P end, the R end is closed, the R end of the fourth three-way valve 21 is closed, the P end and the A end are opened, and the end valve 3 is closed, so as to realize the air extraction on the measured product; when the CH sensor 23 detects that the air pressure value in the measured product reaches the design pressure maintaining value, the pressure regulating valve 31 and the switch valve 32 are closed, the CH sensor 23 is used for air pressure detection on the four-way connector 22 and the measured product connected with the four-way connector 22, so as to facilitate the host to judge whether the air tightness of the measured product is qualified according to the detection data, the detection speed is fast, and the accuracy is high.

[0029] In the description of the utility model, it is to be explained that, in the patent application, the "communication" can be understood as indirect communication through a hollow hose or direct communication through a gas connection head. For the orientation words, such as the terms "center", "lateral (X)", "vertical (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the devices or elements referred to must have a specific orientation, structure and operation, and cannot be understood as limiting the specific protection scope of the utility model.

[0030] In addition, the terms "first" and "second" are only used for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the "first" and "second" features can be explicitly or implicitly included one or more features, and in the description of the utility model, the meaning of "several" is two or more than two, unless otherwise explicitly specified and limited.

[0031] In the utility model, unless otherwise explicitly specified and limited, the terms "assembly", "connection" and "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or it can be connected through an intermediate medium; it can be connected internally between two elements. For ordinary skilled persons in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0032] The above-described embodiments only express some implementation manners of the present application, which are described in more detail and in more specifically, but cannot be understood as the limitation of the patent scope of the present application. It should be noted that, for the ordinary skilled in the art, without departing from the concept of the present application, some modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A double-channel airtightness detection core, comprising a base plate (1), a detection module, a detection driving unit arranged on the base plate (1), and a multi-way connector (4) fixed to the base plate (1), the multi-way connector (4) being sequentially communicated with a pair of reference valves (41), a pressure detection reference element (42), and a pair of reference sensors (43), characterized in that: The detection driving unit comprises a pressure regulating valve (31), an on-off valve (32), a first three-way valve (33), a second three-way valve (34), a third three-way valve (35) and a differential pressure sensor (36) which are communicated through hoses in sequence. The first end of the pressure regulating valve (31) is connected with a gas source interface (37), the tail end of the pressure regulating valve (31) is communicated with the first end of the on-off valve (32), the tail end of the on-off valve (32) is communicated with the R end of the first three-way valve (33), the P end and the A end of the first three-way valve (33) are respectively communicated with the P end of the third three-way valve (35) and the R end of the second three-way valve (34), the A end and the P end of the second three-way valve (34) are respectively communicated with the multi-way connector (4) and the R end of the third three-way valve (35), and the two ends of the differential pressure sensor (36) are respectively communicated with the tail end of the pressure regulating valve (31) and the A end of the third three-way valve (35).

2. The dual lane hermeticity inspection engine of claim 1, wherein: The detection module comprises a fourth three-way valve (21), a four-way connector (22) and a CH detection interface (30) which are communicated in sequence. The four-way connector (22) is connected with a CH sensor (23) and a terminal valve (3), and the A end and the P end of the fourth three-way valve (21) are respectively connected with the multi-way connector (4) and the four-way connector (22).

3. The dual lane hermeticity inspection engine of claim 2, wherein: The number of the detection modules is at least two, and the A end of the fourth three-way valve (21) in the at least two detection modules is communicated with the multi-way connector (4).

4. The dual lane hermetic test core of claim 1, wherein: The first end of the pressure regulating valve (31) is connected with a gas pressure detection and display device (38) for detecting the gas pressure at the gas source interface (37) and displaying the gas pressure value.

5. The dual lane hermetic test core of claim 1, wherein: The pipeline, in which the P end of the third three-way valve (35) and the R end of the second three-way valve (34) are communicated, is provided with a detection interface (3A).

6. The dual lane hermetic test core of claim 1, wherein: A fifth three-way valve (39) is further included, and the A end and the P end of the fifth three-way valve (39) are respectively communicated with the A end of the second three-way valve (34) and the multi-way connector (4) through hoses.

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