Positive pressure air tightness detection device

Abstract

The utility model discloses a positive pressure air tightness detection device, which comprises an air pump and an exhaust structure, the air pump and the exhaust structure are respectively connected with a piece to be detected, the piece to be detected is connected with an indicating device, air is conveyed to the piece to be detected through the air pump, and the air tightness of the piece to be detected is confirmed through an indicating signal of the indicating device. According to the technical scheme, a positive pressure detection principle is adopted to replace a traditional negative pressure vacuum detection mode, the problem that the soft sealing material is sucked by negative pressure to cause false detection qualification is solved, the detection accuracy and practicability are effectively improved, the rate of unqualified products is reduced, the production cost is saved, the overall structure is simple, operation is convenient, and the production efficiency is improved. The device can be easily popularized and applied to airtightness detection of industries such as small household appliances.

Description

Technical Field

[0001] This utility model belongs to the field of testing equipment and relates to a positive pressure testing airtightness device. Background Technology

[0002] Existing airtightness testing equipment generally uses the principle of negative pressure vacuum for testing. This method tests the sealing performance of containers or components by creating a vacuum. However, this method has significant drawbacks when testing soft material seals. Under negative pressure, the soft material is sucked up and fills the gaps, leading to false positives despite the actual gaps remaining. This fails to meet production application requirements, resulting in a high failure rate and rendering the test ineffective. Summary of the Invention

[0003] In order to overcome at least one deficiency of the prior art, this utility model provides a positive pressure detection airtightness device.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a positive pressure airtightness testing device, comprising an air pump and an exhaust structure, wherein the air pump and the exhaust structure are respectively connected to the test piece, and the test piece is connected to an indicator device. Gas is delivered to the test piece by the air pump, and the airtightness of the test piece is confirmed by the indicator signal of the indicator device.

[0005] Furthermore, the air pump is connected to the test piece via a sealed structure.

[0006] Furthermore, the indicating device is configured to detect liquid, the detection liquid is loaded in the test piece, and the indicating signal is that the test piece is leaking liquid.

[0007] Furthermore, the sealing structure includes an air pipe and a sealing head, the air pipe connecting the air pump and the sealing head, and the sealing head connecting the test piece.

[0008] Furthermore, the exhaust structure includes an exhaust pipe, a one-way valve is provided inside the exhaust pipe, and the exhaust pipe is connected to the test piece.

[0009] Furthermore, it also includes a control board and a switch. The control board is electrically connected to the air pump. By pressing the switch, the control board controls the air pump to start. The control board sends an start signal to the air pump, and the air pump receives the start signal and starts.

[0010] Furthermore, it also includes a power cord, which is connected to the control board.

[0011] Furthermore, it also includes an air box, with the control board and air pump installed inside the air box, the switch located outside the air box, and the power cord extending outward through the air box.

[0012] Furthermore, the indicating device is configured to detect liquid, the test piece is loaded in the detection liquid, and the indicating signal is the appearance of bubbles in the detection liquid.

[0013] In summary, the advantages of this utility model are as follows:

[0014] The technical solution of this utility model adopts the positive pressure detection principle to replace the traditional negative pressure vacuum detection method, avoiding the problem of false qualified tests caused by the suction of soft sealing materials by negative pressure. It effectively improves the detection accuracy and practicality, reduces the defect rate, saves production costs, and has a simple overall structure, is easy to operate, and is easy to promote and apply to the airtightness detection needs of industries such as small household appliances. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the device of this utility model.

[0016] Figure 2 This is a schematic diagram of the internal structure of the device of this utility model. Detailed Implementation

[0017] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other.

[0018] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0019] In this embodiment of the invention, all directional indicators (such as up, down, left, right, front, back, horizontal, vertical, etc.) are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0020] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of this utility model may actually be an approximate parallel relationship, and the perpendicular relationship may actually be an approximate perpendicular relationship.

[0021] Example 1:

[0022] like Figures 1-2As shown, a positive pressure airtightness testing device is used to test the airtightness of a test piece. The positive pressure airtightness testing device includes an air pump 1 and an exhaust structure 2. The air pump 1 and the exhaust structure 2 are respectively connected to the test piece. The test piece is equipped with an indicator device, and the airtightness of the test piece is confirmed by the indicator signal of the indicator device.

[0023] The positive pressure airtightness testing device is used to test the airtightness of the test chamber of the test piece. Air pump 1 is connected to the test chamber and delivers gas to the test chamber. When the airtightness of the test piece is qualified, the indicator device is in the non-triggered state. The air pressure in the test chamber gradually increases until it reaches the set air pressure, after which the exhaust structure 2 opens to exhaust gas. When the airtightness of the test piece is unqualified, the indicator device sends an indication signal.

[0024] The indicator device is used to confirm the airtightness of the test piece. When the airtightness of the test piece is qualified, the indicator device is in an untriggered state. When the airtightness of the test piece is unqualified, the indicator device sends an indication signal. Thus, the presence or absence of an indication signal can quickly and accurately confirm whether the airtightness of the test piece is qualified.

[0025] The indicator device is set to detect the liquid, which is loaded onto the test piece. The outlet of the air pump 1 extends into the liquid, and the air pump 1 delivers gas to the detection chamber. When the airtightness of the test piece is qualified, the air pressure in the detection chamber gradually increases until it reaches the set air pressure, at which point the exhaust structure 2 opens to exhaust gas. When the airtightness of the test piece is unqualified, the pressure forces the test liquid in the chamber to be squeezed out through the gaps, resulting in a leakage indication signal. Thus, by observing whether leakage occurs in the test piece, the airtightness of the test piece can be confirmed.

[0026] The test piece is loaded in the test liquid. Air pump 1 delivers gas to the test chamber. When the air tightness of the test piece is qualified, the air pressure in the test chamber gradually increases until it reaches the set air pressure. Then, the exhaust structure 2 opens to exhaust gas. When the air tightness of the test piece is unqualified, the air pressure gradually increases and exhausts gas through the gap. An indicator signal of bubbles appears in the test liquid. By observing whether bubbles appear in the test liquid, it can be confirmed whether the air tightness of the test piece is qualified.

[0027] For ease of operation and other reasons, the test liquid is usually loaded onto the test piece to confirm whether the airtightness of the test piece is up to standard.

[0028] The liquid being tested can be water, oil, or other similar liquids.

[0029] The air pump 1 is connected to the test piece through a sealing structure 3. The sealing structure 3 includes an air pipe 31 and a sealing head 32. The air pipe 31 connects the air pump 1 and the sealing head 32. The sealing head 32 is connected to the test piece. When the air pump 1 is started, gas is delivered to the test piece along the air pipe 31 and the sealing head 32.

[0030] The exhaust structure 2 includes an exhaust pipe 21, and a one-way valve 22 is provided inside the exhaust pipe 21. The exhaust pipe 21 is connected to the test piece. When the internal air pressure of the test piece reaches the set air pressure, the one-way valve 22 opens to exhaust air. The set air pressure is 10 MPa.

[0031] Preferably, the positive pressure airtightness testing device includes an adapter plate with two sets of sealing heads 32. The exhaust pipe 21 is connected to the test piece through one set of sealing heads 32, and the air pipe 31 is connected to the test piece through the other set of sealing heads 32.

[0032] The positive pressure airtightness detection device also includes a control board 4 and a switch 5. The control board 4 is electrically connected to the air pump 1. Pressing the switch 5 causes the control board 4 to control the opening and closing of the air pump 1.

[0033] The positive pressure airtightness testing device also includes a power cord 6, which is connected to the control board 4. When the power cord 6 is plugged in and the power is turned on, the switch 5 is pressed, and the control board 4 sends an opening signal to the air pump 1. The air pump 1 receives the opening signal and starts to deliver gas to the test object.

[0034] The air pump 1 can be turned off by pressing the switch 5. Specifically, when the switch 5 is pressed, the control board 4 sends a shutdown signal to the air pump 1, and the air pump 1 receives the shutdown signal and stops supplying gas to the test object.

[0035] Alternatively, the control board 4 can be set to send a shutdown signal to the air pump 1 at regular intervals to achieve automatic power-off.

[0036] The positive pressure airtightness testing device also includes an air box 7, a control board 4 and an air pump 1 installed inside the air box 7, a switch 5 located outside the air box 7 for easy pressing, and a power cord 6 extending outward through the air box 7.

[0037] The implementation process of this embodiment is as follows:

[0038] When the airtightness of the test piece needs to be tested, the test liquid is loaded into the test piece, and the test piece is installed in the sealing head 32. After the test piece is installed, the switch 5 is pressed, and the control board 4 sends an start signal to the air pump 1. The air pump 1 receives the start signal and starts to deliver gas to the test piece along the air pipe 31 and the sealing head 32. The air pump 1 delivers gas to the chamber at regular intervals. During this process, the air pressure in the test chamber gradually increases. If there is a gap in the test piece, the pressure drives the test liquid in the chamber to be squeezed out through the gap, resulting in a leakage indication signal. If there is no gap in the test piece, the air pressure... After the pressure is further increased to the set level, the one-way valve 22 opens to release air. No leakage indication signal appears, thus the airtightness of the tested component is confirmed by observing whether leakage occurs. This application adopts the positive pressure detection principle to replace the traditional negative pressure vacuum detection method, avoiding the problem of false positives caused by the suction of soft sealing materials by negative pressure. It effectively improves the accuracy and practicality of detection, reduces the defect rate, saves production costs, and has a simple overall structure and is easy to operate, making it easy to promote and apply to the airtightness testing needs of industries such as small household appliances.

[0039] In other implementations, the control board can also be powered by a battery.

[0040] The air pump, control board, and switch 5 used in this application are all conventional models in the prior art, and their internal structure is a prior art structure. Workers can perform normal operation on them according to the existing technical manual, and the connection between them adopts the conventional connection method in the prior art, which will not be described in detail here.

[0041] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort should fall within the protection scope of this utility model.

Claims

1. A positive pressure leak detection air tightness device, characterized in that: The application relates to a gas pump and exhaust structure, which are connected with a measured piece respectively, the measured piece is connected with an indicating device, gas is delivered to the measured piece by the gas pump, and the air tightness of the measured piece is confirmed by an indicating signal of the indicating device.

2. A positive pressure leak detection apparatus as defined in claim 1, wherein: The gas pump is connected with the measured piece through a sealing structure.

3. A positive pressure leak detection device as defined in claim 1, wherein: The indicating device is arranged to detect liquid, the liquid is loaded in the measured piece, and the indicating signal is liquid leakage of the measured piece.

4. A positive pressure leak detection apparatus as defined in claim 2, wherein: The sealing structure comprises a gas pipe and a sealing head, the gas pipe is communicated with the gas pump and the sealing head, and the sealing head is connected with the measured piece.

5. A positive pressure leak detection apparatus as defined in claim 1, wherein: The exhaust structure comprises an exhaust pipe, a one-way valve is arranged in the exhaust pipe, and the exhaust pipe is connected with the measured piece.

6. A positive pressure leak detection apparatus as defined in claim 1, wherein: The application further comprises a control panel and a switch, the control panel is electrically connected with the gas pump, the control panel controls the opening of the gas pump by pressing the switch, the control panel delivers an opening signal to the gas pump, and the gas pump starts after receiving the opening signal.

7. A positive pressure leak detection apparatus as defined in claim 6, wherein: The application further comprises a power line, which is connected with the control panel.

8. A positive pressure leak detection apparatus as defined in claim 7, wherein: The application further comprises a gas tank, the control panel and the gas pump are arranged in the interior of the gas tank, the switch is arranged outside the gas tank, and the power line extends outward through the gas tank.

9. A positive pressure leak detection apparatus as defined in claim 1, wherein: The indicating device is arranged to detect liquid, the liquid is loaded in the measured piece, and the indicating signal is bubble emergence of the liquid.

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