Double-channel positive and negative pressure leak detector

Abstract

The utility model relates to the technical field of air tightness detection equipment, in particular to a double-channel positive and negative pressure leak detector, which comprises a cuboid-shaped frame, a detection machine core arranged in the frame, and a front panel, a top plate, a bottom plate, a left side plate, a right side plate and a back plate which are arranged on the frame, the detection machine core comprises a base plate, a detection module, a detection driving unit and a multi-way connector which are arranged in a frame, the multi-way connector is sequentially communicated with a benchmarking valve, a pressure detection standard part and a benchmarking sensor, and the inner side of the left side plate and the inner side of the right side plate are each provided with a vertical net plate used for installing an airtight part. A control host, a driving power source and a wiring board electrically connected with the control host are further arranged in the frame, the control host and the wiring board are fixedly installed on the inner sides of the two vertical net plates respectively, and a touch panel electrically connected with the control host is embedded in the front panel. The dual-channel positive and negative pressure leak detector 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 kind of double-channel positive and negative pressure leak detector. 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 directly through an instrument, and after pressure stabilization, the pressure drop or leakage amount within a period of time is detected 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, the gas tightness is determined by comparing the pressure difference inside the measured object before and after inflation, and the leakage amount is calculated. Differential pressure testing adds a differential pressure sensor for detection based on direct pressure testing. 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. Differential pressure testing generally has higher precision and sensitivity, and can detect smaller leaks. Although 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. Direct pressure testing is suitable for situations where the airtightness requirement is not very 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.

[0004] However, there is no solution on the market that can achieve airtightness detection under positive and negative pressure without replacing hardware devices, making it difficult to meet the needs of both positive and negative airtightness detection. UTILITY MODEL CONTENTS

[0005] The utility model wants to solve the technical problem to provide a kind of double-channel positive pressure leak detector under the premise of not needing to replace hardware equipment, and the positive pressure leak detector of negative pressure air tightness detection is considered.

[0006] In order to solve the above technical problems, the utility model adopts the following technical scheme: a kind of double-channel positive pressure leak detector, including the frame of cuboid, the detection machine core being arranged in frame and the front panel, top plate, bottom plate, left side plate, right side plate and back plate being arranged on the frame, detection machine core includes the substrate being installed in frame, detection module, the detection drive unit being installed on substrate and the multi-pass connector being fixed to substrate, the multi-pass connector is sequentially communicated with the valve, pressure detection standard piece and the sensor of pairing, the inside of left side plate and right side plate is equipped with the vertical net plate for installing airtight component, both ends of the vertical net plate are fixedly connected with frame;Control host, drive power supply and wiring board electrically connected with control host are further provided in the frame, control host and wiring board are respectively fixedly installed on the inside of two vertical net plates, front panel is embedded with the touch panel electrically connected with control host.

[0007] Preferably, the detection drive unit includes 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 an air 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-pass 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.

[0008] Preferably, the frame and the bottom plate are made of the same metal plate and are formed by four circular arc bending, the two edges of the bottom plate are bent upward to form two bottom frame beams, and the left side plate and the right side plate are provided with heat dissipation mesh holes.

[0009] Preferably, the bottom plate is fixedly provided with a first mounting plate and a second mounting plate, the first mounting plate and the second mounting plate are spaced apart by at least three vertical columns, and the drive power supply is fixed in the space between the first mounting plate and the second mounting plate.

[0010] Preferably, the detection module includes a fourth three-way valve, a four-way connector and a CH detection interface connected in sequence, the four-way 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-pass connector and the four-way connector.

[0011] 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-pass connector.

[0012] 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.

[0013] Preferably, the pipeline through which the P end of the third three-way valve and the R end of the second three-way valve communicate is provided with a detection interface.

[0014] Preferably, a fifth three-way valve is further included, and the A end and the P end of the fifth three-way valve are in communication with the A end of the second three-way valve and the multi-way connector through a hose, respectively.

[0015] The utility model discloses a double -channel positive pressure and negative pressure leak detector, in the assembly process of actual airtightness equipment, pressure regulating valve, switch valve, first three -way valve, second three -way valve, third three -way valve, pressure difference sensor and all three -way valves are connected with the wiring board of control host computer electrically. In the detection process, the gas source interface is in communication with the external gas source equipment such as air compressor or gas tank, and the detection module is sealedly connected with the gas pressure detection port of the measured product. The control host computer controls the opening and closing of each valve, inflates or pumps the measured product first, closes the switch valve and the corresponding three -way valve when reaching the set pressure value, and maintains this state until reaching the pressure maintaining setting time. By comparing the detection parameters of the sensor and the detection module, it is determined whether the airtightness of the measured product meets the requirements, and whether the product leaks is determined. The utility model has the advantages of convenient use and high detection accuracy. The opening and closing of each electromagnetic valve can also realize double -channel detection of positive pressure and negative pressure, and the detection needs can be met without replacing the hardware detection equipment or parts. The internal structure of the airtightness detection equipment is arranged reasonably in the case, which not only reduces the size of the case, but also ensures the spacing between the internal heating components through the design of the upright base plate and the two upright net plates, facilitates heat dissipation and ventilation, and has high practicability. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional structure schematic diagram of the utility model.

[0017] Figure 2 It is another three-dimensional structure schematic diagram of the utility model from another angle.

[0018] Figure 3 It is a three-dimensional structure exploded schematic diagram of the utility model.

[0019] Figure 4 It is a three-dimensional structure schematic diagram of the airtightness detection core of the utility model.

[0020] Figure 5 It is another three-dimensional structure schematic diagram of the airtightness detection core of the utility model from another angle.

[0021] Figure 6 It is the air path structure schematic view of the air tightness detection machine core of the utility model.

[0022] Figure 7 It is the three-dimensional structure schematic view of the utility model machine case part.

[0023] Figure 8 It is the three-dimensional structure schematic view of another perspective of the utility model machine case part.

[0024] Figure 9 It is the three-dimensional structure exploded schematic view of the utility model machine case part.

[0025] Figure 10 It is the three-dimensional structure exploded schematic view of another perspective of the utility model machine case part. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of those skilled in the art, the utility model will be further described below in conjunction with examples, and the content mentioned in the implementation manner is not a limitation on the utility model.

[0027] As Figures 1 to 10 The utility model discloses a double -channel positive pressure leak detector, double -channel positive pressure leak detector, including the frame 1 of cuboid shape, set up in the detection machine core of frame 1 and set up on the front panel 11, top plate 12, bottom plate 13, left side plate 14, right side plate 15 and back plate 16 of frame 1, detection machine core includes the base plate 110 installed in frame 1, detection module, detection drive unit installed on base plate 110 and the multi -way connector 4 fixed to base plate 110, the multi -way connector 4 is sequentially communicated with the valve 41 of standard, pressure detection standard piece 42 and standard sensor 43, and its characterized in that: the inside of left side plate 14 and right side plate 15 is installed with the vertical net plate 17 for installing airtight component, and the both ends of vertical net plate 17 are fixedly connected with frame 1, control host 1A, drive power supply 1C and wiring board 1B electrically connected with control host 1A are still set up in frame 1, and control host 1A and wiring board 1B are fixedly installed on the inside of two vertical net plates 17, and the front panel 11 is embedded with touch panel 1D electrically connected with control host 1A.Under the premise of reducing the volume of air tightness detector, the internal structure of air tightness detection equipment is reasonably arranged in the machine case, not only effectively reduces the volume of machine case, but also guarantees the interval between internal heating components through the design of vertical base plate 7 and two vertical net plates 51, is convenient for heat dissipation ventilation, and practicality is strong.

[0028] In the embodiment, the frame 1 and the bottom plate 3 adopt the same metal plate to form through four arc bending, and the two edges of the bottom plate 3 are bent upwards to form two bottom frame beams 8, and the processing mode of bending the whole plate effectively reduces the manufacturing procedure of the frame 1 structure, improves the structural strength and assembly efficiency of the machine case structure, and has high cost performance.

[0029] In the embodiment, the bottom plate 3 is fixedly provided with the first mounting plate 18 and the second mounting plate 19, the bottom plate 3 and the first mounting plate 18 are spaced by at least three columns, the first mounting plate 18 and the second mounting plate 19 are spaced by at least three columns, and the driving power supply 1C is fixed in the space between the first mounting plate 18 and the second mounting plate 19. The flatness of the bottom plate 3 can be avoided to cause the problem that the driving power supply 1C is difficult to be accurately installed, and the driving power supply 1C can be effectively prevented from being damaged when the bottom plate 3 or the frame 1 structure is compressed, and the safety and durability are high.

[0030] In the embodiment, the detection core includes a base plate 11, a detection module, a detection driving unit arranged on the base plate 11, and a multi-way connector 4 fixed to the base plate 11, the multi-way 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 which are sequentially communicated by a hose, the first end of the pressure regulating valve 31 is connected with an air 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-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.

[0031] In this embodiment, 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 pressure difference sensor 36, and all the three-way valves are electrically connected with the wiring board 1B of the control host 1A. During the detection process, the gas source interface 37 is connected with external gas source equipment such as an air compressor or a gas tank, the detection module is sealingly connected with the gas pressure detection port of the product to be detected, and the control host 1A controls the opening and closing of each valve to first inflate or deflate the product to be detected, and after reaching the set pressure value, the switch valve 32 and the corresponding three-way valve are closed, and this state is maintained until the pressure maintaining set time is reached. By comparing the detection parameters of the mark 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. By controlling the opening and closing of each electromagnetic valve, the dual-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 is practical. During the assembly of the air tightness detector, the control host 1A and the wiring board 1B are respectively installed on the inner sides of the two upright base plates 7, and the internal structure of the air tightness detection device is reasonably arranged in the case. Not only is the volume of the case effectively reduced, but also the spacing between the internal heating components is ensured by the design of the upright base plate 7 and the two upright mesh plates 51, which facilitates heat dissipation and ventilation, and is practical.

[0032] In this embodiment, the detection module includes a fourth three-way valve 21, a four-way connector 22, and a CH detection interface 30 connected 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 a multi-way connector 4 and the four-way connector 22. During 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 point of this patent application, which will not be described here.

[0033] In this embodiment, the number of detection modules is two, and the A end of the fourth three-way valve 21 in the two detection modules is connected with the multi-way connector 4. If necessary, the air tightness of two products of the same specification can be detected at the same time to improve the detection efficiency, which is more practical.

[0034] It should be noted that the number of detection modules can also be more than three, and the A end of the fourth three-way valve 21 in the detection module can be connected with the multi-way connector 4. In actual application, the air tightness of multiple products of the corresponding specification can be detected at the same time to further improve the detection efficiency, which is especially suitable for occasions with small sealed space and large number of detections, such as small electronic product fields such as mobile phones, tablets, and cameras of vehicle recorders.

[0035] 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 as to facilitate detection and adjustment of the gas source pressure supplied by the external gas source equipment, so that the gas pressure entering the air tightness detection equipment meets the set requirements, and the safety is reliable and high.

[0036] In the embodiment, the pipeline in communication with the P end of the third three-way valve 35 and the R end of the second three-way valve 34 is provided with a detection interface 3A, which is in a closed state in a normal use state. After being used for a period of time, the detection interface 3A can be used for maintenance and correction of the air tightness detection equipment, so as to facilitate maintenance.

[0037] 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 in communication with the A end of the second three-way valve 34 and the multi-way connector 4 through a hose, so as to facilitate further on-off control of the internal passage of the detection equipment by the auxiliary control host 1A, and cooperate with the corresponding equipment maintenance method to realize maintenance and repair of the detection driving unit and the detection module respectively, and improve the maintenance efficiency of the air tightness detection equipment.

[0038] In the inflation process of the positive pressure air tightness detection, the pressure regulating valve 31 and the switch valve 32 are first 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 corresponding 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 terminal valve 3 are all closed, and the inflation of the measured product is realized; 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 switch valve 32 are closed, the CH sensor 23 is used for air pressure detection of the four-way connector 22 and the measured product in communication with the four-way connector 22, so as to facilitate the control host 1A 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.

[0039] In the inflation process of the positive pressure air tightness detection, the pressure regulating valve 31 and the switch valve 32 are first 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 corresponding 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 terminal valve 3 are all closed, and the inflation of the measured product is realized; 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 switch valve 32 are closed, the CH sensor 23 is used for air pressure detection of the four-way connector 22 and the measured product in communication with the four-way connector 22, so as to facilitate the control host 1A 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.

[0040] In the description of the utility model, it is necessary to explain that the "communication" in the patent application can be understood as indirect communication through hollow hose or direct communication through gas connection, for the orientation words, if the terms "center", "transverse (X)", "longitudinal (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, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific protection scope of the utility model.

[0041] In addition, if the terms "first" and "second" are used for description purposes only, they 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 specifically limited.

[0042] In the utility model, unless otherwise specifically specified and limited, if the terms "assembly", "connection" and "connection" are used, they should be understood in a broad sense, for example, they can be fixedly connected, or they can be detachably connected, or integrally connected, or mechanically connected, or directly connected, or connected through an intermediate medium, or connected 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.

[0043] The above-mentioned embodiments only express some embodiments of the utility model, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, some modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A double-channel positive and negative pressure leak detector, comprising a cuboid-shaped frame (1), a detection core arranged in the frame (1), and a front panel (11), a top panel (12), a bottom panel (13), a left side panel (14), a right side panel (15), and a back panel (16) arranged on the frame (1), the detection core comprising a base plate (10) arranged in the frame (1), a detection module, a detection driving unit arranged on the base plate (10), and a multi-way connector (4) fixed to the base plate (10), the multi-way connector (4) being sequentially communicated with a reference valve (41), a pressure detection reference (42), and a reference sensor (43), characterized in that: The inner side of the left side plate (14) and the right side plate (15) is provided with a vertical mesh plate (17) for mounting an air-tight component, and the two ends of the vertical mesh plate (17) are fixedly connected with the frame (1); the frame (1) is further provided with a control host (1A), a driving power supply (1C) and a wiring board (1B) electrically connected with the control host (1A), and the control host (1A) and the wiring board (1B) are respectively fixedly arranged on the inner side of the two vertical mesh plates (17), and the front panel (11) is embedded with a touch panel (1D) electrically connected with the control host (1A).

2. The dual channel positive and negative pressure leak detector of claim 1, wherein: The detection driving unit comprises 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) which are sequentially communicated through hoses, a gas source interface (37) is connected to the first end of the pressure regulating valve (31), 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-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).

3. The dual channel positive and negative pressure leak detector of claim 1, wherein: The frame (1) and the bottom plate (13) are formed by four circular arc bending of the same metal plate, the two edges of the bottom plate (13) are bent upward to form two bottom frame beams, and the left side plate (14) and the right side plate (15) are both provided with heat dissipation mesh holes.

4. The dual channel positive and negative pressure leak detector of claim 1, wherein: The bottom plate (13) is fixedly provided with a first mounting plate (18) and a second mounting plate (19), at least three vertical columns are arranged between the bottom plate (13) and the first mounting plate (18), and at least three vertical columns are arranged between the first mounting plate (18) and the second mounting plate (19), and the driving power supply (1C) is fixed in the interval between the first mounting plate (18) and the second mounting plate (19).

5. The dual channel positive and negative pressure leak detector 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 sequentially communicated, 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).

6. The dual channel positive and negative pressure leak detector of claim 5, wherein: The number of the detection modules is at least two, and the A end of the fourth three-way valve (21) of the at least two detection modules is communicated with the multi-way connector (4).

7. The dual channel positive and negative pressure leak detector of claim 2, 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.

8. The dual channel positive and negative pressure leak detector of claim 2, wherein: The pipe, through 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).

9. The dual channel positive and negative pressure leak detector of claim 1, wherein: Further comprising a fifth three-way valve (39), 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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