CN214224466U - Leakage standard sample for air tightness detection - Google Patents

Abstract

The utility model discloses an air tightness detects seepage trade sample, including thin cylinder one and thin cylinder two, thin cylinder one all is equipped with the position sleeve with two tip of thin cylinder, two cylinders set up perpendicularly, form standard volume chamber through end cap seal, end cap joint, the joint tip is equipped with the venthole, be equipped with the gas outlet on the end cap seal, the clamp plate pushes down joint and end cap, a thin cylinder front end installation is sealed to fill up, withstand inlet port closed standard volume chamber through sealed the pad, be equipped with the piston in the standard volume chamber, the piston rod of thin cylinder two runs through the piston, be equipped with the sealing washer between piston rod and the end cap, be equipped with the air vent on the position sleeve of two tip of thin cylinder. The utility model discloses can effectively avoid designing the at the uniform velocity seepage of aperture trade sample and cause the jam, or the condition of the data change that other new conditions arouse, guarantee the equipment accuracy, guarantee that the product percent that airtight detected is qualified, can not the seepage.

Description

Leakage standard sample for air tightness detection

Technical Field

The utility model relates to an automobile water pump leakproofness detects technical field, specifically indicates an air tightness detects seepage trade mark.

Background

In recent years, with the development of the automobile industry, more and more parts are processed and need to be subjected to leakage detection, and various parts such as an engine body, an oil pan, an automobile water pump, a water tank and the like with oil or anti-freezing liquid inside need to ensure the sealing property. Along with the development of sensor technology, the leakage is detected to the gas leakage detection instrument that now generally uses, and the detector divides positive pressure to detect and negative pressure detection, and positive pressure testing process: after the inner cavity is closed, gas with certain pressure is filled, after the gas is stabilized, the pressure drop amplitude is measured by a sensor, and then the leakage per minute is calculated according to a formula. And (3) a negative pressure detection process: and pumping the gas in the closed cavity to a certain negative pressure in a vacuumizing mode, measuring the pressure rise after the gas is stabilized, and then calculating the leakage per minute. The leakage calculation formula is as follows: q ═ Ve × (Δ P/Patm) × (60/T); ve: equivalent internal volume (ml), Δ P: pressure drop of leak (Pa/min), Patm: Standard atmospheric pressure 1.013X 10^5Pa, T: the detection time(s).

After the automobile water pump is assembled, the tightness detection is required, and according to the technical conditions of the automobile engine cooling water pump (C/T288.1-2001), the tightness test requirements are as follows: compressed air is introduced into the inner cavity, the pressure is 138kPa, the test time is 10s after the pressure is balanced, and the leakage rate is not more than 10 mL/min. The gas leakage detector of the detection equipment is made according to the requirement. In the process of detecting the equipment, because of the influence of factors such as a designed tool plugging mechanism, an equipment self plugging leakage mechanism, a standard product (a container designed by a differential pressure detection method and used for compensating the influence of temperature and the like) side leakage and the like, how to determine whether the detected data is accurate has no proper method for verification. Some factories use the product for detecting leakage as a standard sample, record data, and use the standard sample as a leakage standard sample when detecting the product again in the later period, and verify equipment. Still another is to make a leaky container separately, which is used as a standard. However, this method has certain disadvantages:

the product is used as a leakage standard sample, the leakage of the product is mainly in various conditions, the leakage of a water seal friction pair, the leakage of a water seal rubber part, the leakage of the matching surface of a water seal and a pump body or a bearing and the like exist, and the pump body has micropore leakage. Such leakage mark data are unstable, the sample has the condition of later data conversion, for example, the water seal friction pair leaks, dirty objects possibly exist in the friction pair, the leakage can be reduced after the sample is blown out by gas in the later period, the water seal rubber part leaks, the possibility that the leakage position of the rubber part is continuously enlarged exists, the pump body leaks, the small hole can be blocked by rusting in the later period of the iron casting, and the oxidation corrosion leakage amount of the aluminum part can also be changed after the time of the aluminum part. When a special leakage standard sample is made, micropores are difficult to manufacture, the diameter is too small and is less than 0.1mm, and data change is caused due to easy blockage in the using process.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome above technical defect, provide an air tightness and detect seepage trade sample.

In order to solve the technical problem, the utility model provides a technical scheme does: the utility model provides an air tightness detects seepage trade sample, including thin cylinder one and thin cylinder two, thin cylinder one and two tip of thin cylinder all are equipped with the position sleeve, two cylinders set up perpendicularly, form standard volume chamber through the end cover seal, end cover joint, the joint tip is equipped with the venthole, be equipped with the gas outlet on the end cover, the clamp plate pushes down joint and end cover, sealed pad is installed to thin cylinder one front end, it seals standard volume chamber to withstand the inlet port through sealed pad, be equipped with the piston in the standard volume chamber, the piston rod of thin cylinder two runs through the piston, be equipped with the sealing washer between piston rod and the end cover, be equipped with the air vent on the position sleeve of thin cylinder two tip.

Preferably, the gasket is made of PTFE.

Preferably, the diameter of the air inlet hole is 1.5 mm.

Preferably, the sealing end cover is provided with a first O-shaped ring and a second O-shaped ring.

Preferably, a C-shaped sealing ring is arranged on the piston.

Preferably, the first thin cylinder is provided with a supporting pad.

Compared with the prior art, the utility model the advantage lie in: this set of mechanism is through designing out the device of the total volume of seepage in the 10S, and once only fill in the testing process and detect the article inside, although not at the uniform velocity seepage, finally to the testing time of settlement after, the total amount of seepage is the same, can effectively avoid designing the aperture trade sample at the uniform velocity seepage and cause the jam, or the data change 'S that other new circumstances arouse the condition, guarantees the equipment accuracy, guarantees that airtight detection' S product is hundred percent qualified, can not the seepage.

Drawings

Fig. 1 is the structure diagram of the leakage standard sample for air tightness detection of the present invention.

Fig. 2 is a schematic structural diagram of the left movement of the piston of the present invention.

As shown in the figure: 1. a first thin cylinder; 2. a gasket; 3. a support pad; 4. pressing a plate; 5. a joint; 6. a piston rod; 7. sealing the end cap; 8. a first O-shaped ring; 9. an O-shaped ring II; 10. a seal ring; 11. a piston; 12. a C-shaped sealing ring; 13. a positioning sleeve; 14. a second thin cylinder; 15. a vent hole; 16. an air inlet; 17. an air outlet; 18. a screw; 19. a nut; a, an air outlet cavity; b, a standard volume cavity; c, a ventilation cavity; and D, air outlet.

Detailed Description

The technical solution of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

With reference to the accompanying drawings 1 and 1, the leakage standard sample for air tightness detection comprises a first thin cylinder 1 and a second thin cylinder 14, and is characterized in that: the end parts of the first thin cylinder 1 and the second thin cylinder 14 are respectively provided with a positioning sleeve 13, the two cylinders are vertically arranged and are sealed through a sealing end cover 7 to form a standard volume cavity B, the sealing end cover 7 is connected with a joint 5, a pressing plate 4 presses the joint 5 and the sealing end cover 7, a sealing gasket 2 is arranged at the front end of the first thin cylinder 1 and abuts against an air inlet hole 16 through the sealing gasket 2 to seal the standard volume cavity B, a piston 11 is arranged in the standard volume cavity B, a piston rod 6 of the second thin cylinder 14 penetrates through the piston 11, a sealing ring 10 is arranged between the piston rod 6 and the sealing end cover 7, an air outlet D is formed in the sealing end cover 7, an air outlet 17 is formed in the end part of the joint 5, and an air vent 15 is formed in the positioning sleeve 13 in the end part of the second thin cylinder 14. And the sealing end cover 7 is provided with a first O-shaped ring 8 and a second O-shaped ring 9. And a C-shaped sealing ring 12 is arranged on the piston 11. And a supporting pad 3 is arranged on the thin cylinder 1.

When the utility model is implemented specifically, the front end of the thin cylinder I1 is provided with the sealing gasket 2 made of PTFE material, after the cylinder acts, the standard volume cavity B can be sealed by the sealing gasket 2, the gas volume of the inner cavity is 1087mml, the hardness of the PTFE material is higher than that of the nitrile rubber (Shore hardness is 55-65), the air inlet hole 16 is propped, the sealing condition of the air inlet hole 16 can be ensured, the air volume in the cavity B can not be changed due to too large compression, and the diameter of the air inlet hole 16 is smaller than 1.5 mm; the influence can be further reduced; the connector 5 is used for connecting a G1/8 connector and can be connected to a detection product needing to be fed with gas through a pipeline, and the equivalent volume Ve comprises the connected pipeline and the volume of the gas outlet cavity A; the pressure plate 4 is used for pressing the joint 5 and the sealing end cover 7, the first O-shaped ring 8, the second O-shaped ring 9 and the sealing ring 10 are used for sealing gas, the piston 11 can be pushed to move rightwards when the thin cylinder 14 acts, the piston rod 6 seals gas in the cavity B through the sealing ring 10, when the piston rod 6 and the piston 11 move leftwards to the gas outlet D and pass through the position of the sealing ring 10, the gas in the standard volume cavity B can be discharged to the gas outlet cavity A, and the piston 11 stops moving after moving to be in contact with the sealing end cover 7. At this time, a part of cavity is still arranged in the standard volume cavity B, as shown in fig. 2, the shadow part of the standard volume cavity B, the volume of the part of cavity is the same as the volume between the starting position and the final position of the piston rod 6, the air outlet cavity A is communicated with the standard volume cavity B, and the total volume of the two cavities is the same as the volume of the air outlet cavity A when the piston 11 does not act, so that the equivalent volume Ve of a measurement product cannot be changed, and the measurement result cannot be influenced. The vent hole 15 of the vent chamber C is used for venting air to prevent negative or positive pressure in the chamber.

The utility model discloses an adjustment method does: a completely leak-free product (selectable by bubble detection) was sought in advance. The device is connected with an air suction pipeline of a detection product by a three-way joint, a first plugging thin cylinder 1 acts first to seal the gas in a standard volume cavity B, when the detection is started after the equipment is inflated and balanced, a second inflating thin cylinder 14 acts to send 1087mml of gas into the detection product, and after the detection time of the detection product reaches 10 seconds, if the detection result is consistent with the volume of the inflated gas, the equipment tool has no problem.

The present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.

Claims (6)

1. The utility model provides an air tightness detection seepage standard sample, includes thin cylinder one and thin cylinder two, its characterized in that: the first thin cylinder and the second thin cylinder are respectively provided with a positioning sleeve, the two cylinders are vertically arranged and form a standard volume cavity through sealing of a sealing end cover, the sealing end cover is connected with a joint, the joint end is provided with an air outlet, the sealing end cover is provided with an air outlet, a pressing plate presses the joint and the sealing end cover, a sealing gasket is arranged at the front end of the first thin cylinder and props against an air inlet hole through the sealing gasket to seal the standard volume cavity, a piston is arranged in the standard volume cavity, a piston rod of the second thin cylinder penetrates through the piston, a sealing ring is arranged between the piston rod and the sealing end cover, and an air vent is arranged on the positioning sleeve at the second thin cylinder end.

2. The leak-off test specimen for airtightness testing according to claim 1, wherein: the sealing gasket is made of PTFE material.

3. The leak-off test specimen for airtightness testing according to claim 1, wherein: the diameter of the air inlet hole is 1.5 mm.

4. The leak-off test specimen for airtightness testing according to claim 1, wherein: and the sealing end cover is provided with a first O-shaped ring and a second O-shaped ring.

5. The leak-off test specimen for airtightness testing according to claim 1, wherein: and a C-shaped sealing ring is arranged on the piston.

6. The leak-off test specimen for airtightness testing according to claim 1, wherein: and a supporting pad is arranged on the first thin cylinder.

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