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CN-224202678-U - Differential pressure type air tightness detection device

CN224202678UCN 224202678 UCN224202678 UCN 224202678UCN-224202678-U

Abstract

The utility model provides a differential pressure type air tightness detection device which comprises a valve plate, an air inlet valve, an air outlet valve, a pressure sensor and a differential pressure sensor, wherein the air inlet valve, the first air outlet channel and the second air outlet channel are arranged on the valve plate, the air inlet valve is connected with the air inlet channel, the first air outlet channel and the second air outlet channel and used for controlling the on-off of the air inlet channel and the first air outlet channel and the second air outlet channel, the air outlet valve is connected with the first air outlet channel and the second air outlet channel and used for controlling the on-off of the first air outlet channel and the second air outlet channel and the outside, the pressure sensor is connected with the first air outlet channel and used for detecting whether the pressure in a test cavity changes or not, and the differential pressure sensor is connected with the first air outlet channel and the second air outlet channel and used for detecting the pressure difference between the test cavity and a standard cavity.

Inventors

  • CHEN MINGHAO
  • YAN JUNKUN

Assignees

  • 宁波迈瑟夫自动化科技有限公司

Dates

Publication Date
20260505
Application Date
20250520

Claims (8)

  1. 1. The differential pressure type air tightness detection device is characterized by comprising a valve plate (1), an air inlet valve (2), an air outlet valve (3), a pressure sensor (4) and a differential pressure sensor (5) which are arranged on the valve plate (1), wherein the valve plate (1) is provided with an air inlet channel (11), a first air outlet channel (12) and a second air outlet channel (13), the air inlet valve (2) is connected with the air inlet channel (11), the first air outlet channel (12) and the second air outlet channel (13) and used for controlling the on-off of the air inlet channel (11) and the first air outlet channel (12) and the second air outlet channel (13), the air outlet valve (3) is connected with the first air outlet channel (12) and the second air outlet channel (13) and used for controlling the on-off of the first air outlet channel (12) and the second air outlet channel (13) and the outside, the pressure sensor (4) is connected with the first air outlet channel (12) and used for detecting whether the pressure in a test cavity changes or not, and the differential pressure sensor (5) is connected with the first air outlet channel (12) and the second air outlet channel (13) and used for detecting the pressure difference between the test cavity and the standard.
  2. 2. The differential pressure type air tightness detection device according to claim 1 is characterized in that one end, far away from an air inlet valve (2), of the air inlet channel (11) penetrates through one side wall of the valve plate (1) and is connected with an air inlet nozzle (14) for being connected with an external air source, one end, far away from the air inlet valve (2), of the first air outlet channel (12) and the second air outlet channel (13) penetrates through the other side wall of the valve plate (1) and is connected with an air outlet nozzle (15), and the two air outlet nozzles (15) are respectively used for being connected with a test cavity and a standard cavity.
  3. 3. The differential pressure type air tightness detection device according to claim 2, wherein the two air outlet nozzles (15) are connected with manual stop ball valves (16) for opening or closing the corresponding air outlet nozzles (15).
  4. 4. The differential pressure type air tightness detection device as set forth in claim 3, wherein the connection parts of the differential pressure sensor (5) and the first air outlet channel (12) and the second air outlet channel (13) are respectively provided with a filter element (6) for filtering air entering the differential pressure sensor (5).
  5. 5. The differential pressure type airtight device as set forth in claim 4, wherein said intake valve (2) comprises a valve body (21), a piston plate (22), a sealing connector (23) and a gasket (24), wherein an upper valve cavity (211) and a lower valve cavity (212) which are coaxially arranged and communicated with each other are provided in said valve body (21) from top to bottom, a first through hole (213) and a second through hole (214) are provided in said valve body (21), said first through hole (213) and said second through hole (214) are respectively communicated with the top and bottom of said upper valve cavity (211), said piston plate (22) is slidably connected in said upper valve cavity (211), the outer peripheral wall of said piston plate (22) is in sealing engagement with the inner wall of said upper valve cavity (211), said sealing connector (23) is slidably connected in said lower valve cavity (212), the outer peripheral wall of said sealing connector (23) is in sealing engagement with the inner wall of said lower valve cavity (212), the upper end of said sealing connector (23) extends into said upper valve cavity (211) and is connected with the bottom of said piston plate (22), said sealing connector (23) is provided with a third through hole (17), said third through hole (17) and a fifth through hole (17) are provided in said valve plate (17) One end of the fifth through hole (19) is communicated with the lower end of the lower valve cavity (212), the other end of the fifth through hole is respectively communicated with the air inlet channel (11), the first air outlet channel (12) and the second air outlet channel (13), and the sealing gasket (24) moves up and down along with the piston plate (22) through the sealing connecting piece (23), so that the fourth through hole (18) and the fifth through hole (19) are opened or closed.
  6. 6. The differential pressure type air tightness detection device of claim 5, wherein the inner top wall of the upper valve cavity (211) is provided with a limiting hole (2111), a limiting rod (221) is arranged at the top of the piston plate (22) at a position corresponding to the limiting hole (2111), and the free end of the limiting rod (221) axially slides and is circumferentially limited in the limiting hole (2111).
  7. 7. The differential pressure type air tightness detection device as set forth in claim 5, wherein sealing rings (25) are provided on the outer peripheral walls of the piston plate (22) and the sealing connection member (23) for improving the tightness thereof.
  8. 8. The pressure-difference airtight detecting device of claim 5, wherein a connecting hole (231) for inserting the upper end of the sealing gasket (24) is formed in the lower end of the sealing connecting piece (23), an annular clamping groove (232) is formed in the upper end of the inner wall of the connecting hole (231), a radially protruding clamping ring (241) is arranged at the upper end of the outer peripheral wall of the sealing gasket (24), and the clamping ring (241) is clamped in the annular clamping groove (232).

Description

Differential pressure type air tightness detection device Technical Field The utility model relates to the technical field of air tightness detection equipment, in particular to a differential pressure type air tightness detection device. Background The sealing tester is also called an air tightness tester, and is mainly suitable for sealing tests of packaging bags, bottles, pipes, tanks, boxes, battery packs and the like in the industries of foods, pharmacy, medical equipment, daily chemicals, automobiles, electronic components, stationery, consumer electronics and the like, so that the damage and air leakage are avoided. The existing sealing test generally adopts two types of direct test and differential pressure test, wherein the direct test is to connect a pressure sensor on a test pipeline, put a test product into a test cavity, then flush compressed gas, stand still and observe whether the pressure sensor changes, and the detection mode is simple and convenient, but if the test product leaks very slowly, the condition that the test product cannot be detected in a short time is easy to occur, and the method is suitable for the test product with general detection precision requirements. The differential pressure test is to set a differential pressure sensor between the test pipeline and the standard pipeline, then to put the test product and the standard product into the test cavity and the standard cavity respectively, to be static after the compressed gas is injected, to observe whether the differential pressure sensor has a pressure difference value. Therefore, designing a differential pressure type air tightness detection device capable of automatically selecting a test mode according to the requirements of users becomes a problem to be solved urgently at present. In addition, the gas circuit of current gas tightness detection device realizes the break-make through the solenoid valve, and the solenoid valve is after long-time the use, and the condition that generates heat appears easily influences the stability of air current, and then influences the precision of detection. Disclosure of utility model The utility model aims to overcome the defects of the prior art and provide the device capable of selecting the air tightness detection mode according to the requirements. The technical scheme of the utility model is that a differential pressure type air tightness detection device with the following structure is provided: The device comprises a valve plate, and an air inlet valve, an air outlet valve, a pressure sensor and a differential pressure sensor which are arranged on the valve plate; the valve plate is provided with an air inlet channel, a first air outlet channel and a second air outlet channel, the air inlet valve is connected with the air inlet channel, the first air outlet channel and the second air outlet channel and used for controlling the on-off of the air inlet channel and the first air outlet channel and the second air outlet channel, the air outlet valve is connected with the first air outlet channel and the second air outlet channel and used for controlling the on-off of the first air outlet channel and the second air outlet channel and the outside, the pressure sensor is connected with the first air outlet channel and used for detecting whether the pressure in the testing cavity changes or not, and the pressure difference sensor is connected with the first air outlet channel and the second air outlet channel and used for detecting the pressure difference between the testing cavity and the standard cavity. After the structure is adopted, compared with the prior art, the differential pressure type air tightness detection device has the following advantages: The utility model is characterized in that an air inlet channel, a first air outlet channel and a second air outlet channel are arranged on a valve plate, the air inlet channel is connected with an external air source, the first air outlet channel and the second air outlet channel are respectively connected with a test cavity and a standard cavity, a pressure sensor is connected to the first air outlet channel, a pressure difference sensor is connected to the first air outlet channel and the second air outlet channel, a user can select the pressure sensor to detect or the pressure difference sensor according to requirements, when the pressure sensor is used for detection, a test product is placed in the test cavity, then an air inlet valve is controlled to be communicated with the first air outlet channel, the test cavity is inflated, after inflation is finished, the air inlet valve is disconnected with the first air outlet channel, then the pressure sensor on the first air outlet channel is statically observed, if the pressure sensor on the first air outlet channel is changed, if the pressure sensor is changed, the test product is indicated to be damaged, when the pressure difference sensor is used for detection by a user, the st