Filter membrane sampling anti-suck-back mechanism

Abstract

The utility model discloses an anti-suck-back mechanism for filter membrane sampling. The anti-suck-back mechanism comprises a sampling device, a tank body, a connecting pipe and an anti-suck-back structure, one end of the connecting pipe is connected with the sampling device, the other end is connected with the tank body, and the anti-suck-back structure is mounted in the tank body; the suck-back preventing structure comprises a suck-back preventing assembly, a connecting assembly and a fixing assembly. The anti-suction assembly is installed in the connecting pipe, the connecting assembly is installed on the can, and the fixing assembly is installed on the connecting assembly. The utility model relates to the technical field of aerosol, and has the following beneficial effects: the device has a function of preventing suck-back, so that the sampling accuracy is effectively ensured; waste gas generated during sampling of the equipment is effectively guided, so that subsequent centralized collection and treatment are facilitated; and the equipment has a reinforcing function, so that the stability performance of a joint is effectively ensured, and aerosol is prevented from leaking.

Description

TECHNICAL FIELD

[0001] The utility model relates to aerosol technical field, concretely is a filter membrane sampling anti-suckback mechanism. BACKGROUND

[0002] The working principle of aerosol generator is based on different physical principles, and is usually divided into three types: pressure spray, ultrasonic spray and evaporation spray. Pressure spray generates pressure by compressing gas or liquid, sprays liquid from the nozzle, and forms fine droplets; ultrasonic spray uses high-frequency acoustic energy to decompose liquid into tiny particles; evaporation spray produces tiny solid particle aerosols by heating liquid to evaporate. These droplets or particles can be suspended in the air to form aerosols;

[0003] Filter membrane sampling is an important aerosol particle sampling method, which utilizes the trapping effect of filter membrane on particulate matter in the air to deposit particulate matter on the filter membrane. During sampling, gas passes through the filter and deposits particulate matter on it, then the filter membrane is removed and subjected to subsequent chemical analysis or microscopic analysis, etc.

[0004] The existing aerosol sampling device does not have the function of preventing backflow during use, which can cause backflow of aerosol in the gas during sampling, resulting in inaccurate sampling. At the same time, the gas after sampling is directly discharged into the air, which can affect the human body, therefore we design a filter membrane sampling anti-suckback mechanism. UTILITY MODEL CONTENT

[0005] To achieve the above purpose, the utility model realizes the following technical scheme: a filter membrane sampling anti-suckback mechanism, comprising: a sampling device, a tank body, a connecting pipe and an anti-suckback structure; one end of the connecting pipe is connected with the sampling device, and the other end is connected with the tank body; the anti-suckback structure is installed in the tank body.

[0006] The anti-suckback structure comprises: an anti-suction assembly, a connecting assembly and a fixing assembly.

[0007] The anti-suction assembly is installed in the connecting pipe, the connecting assembly is installed on the can, and the fixing assembly is installed on the connecting assembly.

[0008] The anti-suction assembly comprises: an extension rod, a spring, an extension hose, a fixing frame, a connecting block and a rubber pad.

[0009] The fixing frame is installed in the connecting pipe, the extension rod is installed at the center of the fixing frame, the spring is sleeved on the extension rod, the connecting block is installed at the moving end of the extension rod, the rubber pad is installed on the connecting block, and the extension hose is sleeved on the outside of the spring and the extension rod.

[0010] Preferably, the fixing frame is provided with a vent hole.

[0011] Preferably, the connecting assembly comprises: an air outlet pipe, a connecting seat, a fixing seat and a guide block.

[0012] The air outlet pipe is installed on the connecting seat, the fixing seat is installed on the tank body, the guide block is installed on the connecting seat, and the connecting seat is installed on the fixing seat.

[0013] Preferably, the fixing seat is provided with a sliding groove with the same size as the guide block.

[0014] Preferably, the fixing assembly comprises: a connecting rod, a fixing block, a locking spring and a locking block.

[0015] The connecting rod is installed in the fixing seat, the fixing block is sleeved on the connecting rod, the locking spring is installed in the fixing seat and connected with the fixing block, and the locking block is installed on the fixing block.

[0016] Preferably, a sealing gasket is arranged at the connecting position of the fixing seat and the connecting seat.

[0017] Beneficial effects

[0018] The filter membrane sampling anti-suckback mechanism has the following beneficial effects compared with prior art means:

[0019] 1. The anti-suckback assembly is provided, the mutual cooperation of the telescopic rod, the spring, the telescopic hose, the fixing frame, the connecting block and the rubber pad enables the equipment to have the function of preventing suckback, and effectively guarantees the precision of sampling.

[0020] 2. The connecting assembly is provided, the mutual cooperation of the air outlet pipe, the connecting seat, the fixing seat and the guide block enables the waste gas generated during sampling of the equipment to be effectively guided, and facilitates subsequent centralized collection and treatment.

[0021] 3. The fixing assembly is provided, the mutual cooperation of the connecting rod, the fixing block, the locking spring and the locking block enables the equipment to have the function of reinforcement, effectively guarantees the stability of the connecting position, and prevents the leakage of aerosol. DRAWINGS

[0022] Fig. 1 It is a three-dimensional structure schematic view of the anti-suckback assembly of the filter membrane sampling anti-suckback mechanism.

[0023] Fig. 2 It is a front view structure schematic view of the filter membrane sampling anti-suckback mechanism.

[0024] Fig. 3 It is a local enlarged structure schematic view of the filter membrane sampling anti-suckback mechanism.

[0025] In the figure: 1, sampling device; 2, tank body; 3, connecting pipe; 4, telescopic rod; 5, spring; 6, telescopic hose; 7, fixing frame; 8, connecting block; 9, rubber pad; 10, air outlet pipe; 11, connecting seat; 12, fixing seat; 13, guide block; 14, connecting rod; 15, fixing block; 16, locking spring; 17, locking block. DETAILED DESCRIPTION

[0026] Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the range of the utility model protection.

[0027] Please refer to Figs. 1-3 The utility model provides a technical scheme.

[0028] Embodiment 1:

[0029] Please refer to the attached Figs. 1-3 In the specific implementation process: a filter membrane sampling anti-suckback mechanism, including: sampling device 1, tank body 2, connecting pipe 3 and anti-suckback structure, connecting pipe 3 one end is connected with sampling device 1, one end is connected with tank body 2, and anti-suckback structure is installed in tank body 2,

[0030] The anti-suckback structure includes: anti-suction assembly, connecting assembly and fixed assembly,

[0031] The anti-suction assembly is installed in the connecting pipe 3, the connecting assembly is installed on the can, and the fixed assembly is installed on the connecting assembly,

[0032] The anti-suction assembly includes: telescopic rod 4, spring 5, telescopic hose 6, fixing frame 7, connecting block 8 and rubber pad 9,

[0033] The fixing frame 7 is installed in the connecting pipe 3, the telescopic rod 4 is installed at the center of the fixing frame 7, the spring 5 is sleeved on the telescopic rod 4, the connecting block 8 is installed at the movable end of the telescopic rod 4, the rubber pad 9 is installed on the connecting block 8, and the telescopic hose 6 is sleeved on the spring 5 and the telescopic rod 4.

[0034] Need to explain, first open the jar 2, put the filter membrane in the jar 2, in the jar 2 is connected with the sampling device 1 through the connecting pipe 3, start the sampling machine, the aerosol is sucked into the sampling device 1, so as to enter the connecting pipe 3, due to the flow of gas, through the air hole on the fixed frame 7, the rubber pad 9 installed in the connecting pipe 3 is pushed out, so that the aerosol enters the jar 2, when the rubber pad 9 moves outward, the connecting block 8 is moved outward, so as to drive the telescopic rod 4 connected with the connecting block 8 to move outward, and then make the spring 5 sleeved on the telescopic rod 4 be stretched, in the sampling state, the spring 5 is in the stretched state, after sampling is completed, the gas is not subjected to external force, and the rubber pad 9 is not subjected to the thrust, under the action of the spring 5, the rubber pad 9 is moved inward, so as to seal and close the connecting pipe 3 through the rubber pad 9, at the same time, the rubber pad 9 and the outlet of the connecting pipe 3 form a trapezoidal shape, effectively preventing the backflow of the gas, ensuring the precision of sampling, the telescopic hose 6 installed outside the telescopic rod 4 and the spring 5 effectively protects the telescopic rod 4 and the spring 5 from being eroded by the aerosol.

[0035] As a preferred solution, further, the fixed frame 7 is provided with a ventilation hole.

[0036] Need to explain, the fixed frame 7 is provided with a ventilation hole to facilitate the passage of gas.

[0037] As a preferred solution, further, the connecting assembly comprises: an air outlet pipe 10, a connecting seat 11, a fixed seat 12, a guide block 13;

[0038] The air outlet pipe 10 is installed on the connecting seat 11, the fixed seat 12 is installed on the jar 2, the guide block 13 is installed on the connecting seat 11, and the connecting seat 11 is installed on the fixed seat 12.

[0039] Need to explain, in order to place the aerosol in the sampling jar to leak, the gas in the pipe needs to be collected, the guide block 13 on the connecting seat 11 connected with the air outlet pipe 10 is aligned with the groove opened on the fixed seat 12 installed on the jar 2, the connecting seat 11 is connected with the fixed seat 12, so as to guide the gas to be discharged from the jar 2, which is convenient for centralized collection and treatment.

[0040] As a preferred solution, further, the fixed seat 12 is provided with a sliding groove with the same size as the guide block 13.

[0041] Need to explain, the fixed seat 12 is provided with a sliding groove with the same size as the guide block 13, so that the connecting block 8 is inserted into the fixed seat 12 through the guide block 13 to be positioned and guided, ensuring the stability of the connection.

[0042] As a preferred solution, further, the fixing assembly comprises: a connecting rod 14, a fixing block 15, a locking spring 16, and a locking block 17.

[0043] The connecting rod 14 is installed in the fixing base 12, the fixing block 15 is sleeved on the connecting rod 14, the locking spring 16 is installed in the fixing base 12 and connected with the fixing block 15, and the locking block 17 is installed on the fixing block 15.

[0044] It should be noted that the connecting assembly is stressed during sampling, in order to prevent the connecting assembly from being separated and causing aerosol leakage, when the connecting assembly is docked, a person presses the fixing block 15 on the connecting rod 14 to rotate the fixing block 15 around the connecting rod 14, so that the locking block 17 on the fixing block 15 is moved, and the locking spring 16 at the bottom end of the fixing block 15 is compressed, after the docking of the fixing base 12 and the connecting base 11 is completed, the fixing block 15 is released, under the action of the locking spring 16, the fixing block 15 is moved inward, so that the locking block 17 on the fixing block 15 is clamped into the connecting block 8, the connection between the connecting base 11 and the fixing base 12 is reinforced, and aerosol leakage is prevented.

[0045] As a preferred solution, further, the fixing base 12 is provided with a sealing gasket at the connecting position with the connecting base 11.

[0046] It should be noted that the sealing gasket provided at the connecting position of the fixing base 12 and the connecting base 11 improves the sealing performance of the connecting position and effectively ensures the accuracy of sampling.

[0047] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A filter membrane sampling anti-backflow mechanism, comprising: Sampling device, tank, connecting pipe and anti-backflow structure; One end of the connecting pipe is connected to the sampling device, and the other end is connected to the tank body, and the anti-backflow structure is installed in the tank body; The anti-backflow structure includes: an anti-backflow component, a connecting component and a fixing component; It is characterized in that the anti-suction component is installed in the connecting pipe, the connecting component is installed on the can, and the fixing component is installed on the connecting component; The anti-suction assembly includes: a telescopic rod, a spring, a telescopic hose, a fixing frame, a connecting block, and a rubber pad; The fixing frame is installed in the connecting pipe, the telescopic rod is installed in the center of the fixing frame, the spring is sleeved on the telescopic rod, the connecting block is installed on the moving end of the telescopic rod, the rubber pad is installed on the connecting block, and the telescopic hose is sleeved outside the spring and the telescopic rod.

2. A filter membrane sampling anti-backflow mechanism according to claim 1, characterized in that: The fixing frame is provided with a vent hole.

3. A filter membrane sampling anti-backflow mechanism according to claim 1, characterized in that: The connecting assembly includes: an air outlet pipe, a connecting seat, a fixing seat, and a guide block; The air outlet pipe is installed on the connecting seat, the fixing seat is installed on the tank body, the guide block is installed on the connecting seat, and the connecting seat is installed on the fixing seat.

4. A filter membrane sampling anti-backflow mechanism according to claim 3, characterized in that: The fixing seat is provided with a sliding groove with the same size as that of the guide block.

5. A filter membrane sampling anti-backflow mechanism according to claim 1, characterized in that: The fixing assembly includes: a connecting rod, a fixing block, a locking spring, and a locking block; The connecting rod is installed in the fixing seat, the fixing block is sleeved on the connecting rod, the locking spring is installed in the fixing seat and connected with the fixing block, and the locking block is installed on the fixing block.

6. A filter membrane sampling anti-backflow mechanism according to claim 3, characterized in that: A sealing gasket is provided at the connection between the fixing seat and the connecting seat.

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