Gas sampling water-blocking filter

Abstract

The utility model discloses a gas sampling water-blocking filter, which belongs to the technical field of gas detection, the whole structure of the gas sampling water-blocking filter is in a hollow cylindrical shape, the gas sampling water-blocking filter comprises a connecting assembly, the connecting assembly is connected with an external hose through a quick-screwing connector, and the bottom of the connecting assembly is connected with a filtering assembly through threads. A hydrophobic filter disc is installed between the connecting assembly and the filtering assembly, the bottom of the filtering assembly is connected with an air inlet water blocking assembly through threads, and a second rubber gasket is installed between the filtering assembly and the air inlet water blocking assembly; the gas sampling water-blocking filter with the structure is reliable in function, resistant to falling, small in size, simple in structure, portable and easy to clean and maintain, all the components are made of materials which are high in chemical stability, resistant to oil and resistant to corrosion, and generally, the components cannot chemically react with gas conventionally detected by a gas detector.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas detection technical field especially is related to a gas sampling water blocking filter. BACKGROUND

[0002] Portable gas detector can be divided into pump suction type gas detector and diffusion type gas detector according to the different inlet air mode. In the pump suction sampling process, for the gas detection of high difference and long distance, it is usually necessary to connect the extension hose. However, the ordinary hose is light in material and is curled, which is not conducive to vertical or avoiding obstacles to be placed to the target position. Therefore, a device with a certain weight is usually added at the sampling end, and the hose is pulled by its own gravity, so that the gas sample in the target space can be conveniently collected.

[0003] In practical application, the on-site conditions are complex, such as obstacle blocking the line of sight, dark environment (such as deep well, cabin, cave, small aperture storage tank, etc.), which may cause the sampling end to be mistaken with water or other liquid substances. In this case, the pumping force will suck the liquid into the gas detector, causing equipment damage, interrupting the detection work and increasing the safety risk. Therefore, it is very important to develop a sampling end that can effectively block water.

[0004] At present, there is a lack of mature sampling end products in the domestic market that meet the following requirements: a certain weight, installed at the end of the extension hose, can filter the floating objects and dust in the air, and can block water. The only product close to this is the sampling hose set float developed by Japan Science and Technology, which is light in shell material, the inner layer is a hydrophobic and breathable filter membrane, and the float can float on the water surface when contacting water to prevent suction. However, the weight is not enough to pull the hose, and the filter membrane is easy to be contaminated and difficult to clean, which has high use and maintenance cost. TECHNICAL PROBLEM

[0005] The utility model aims at providing a gas sampling water blocking filter to solve the problems mentioned in the background.

[0006] In order to achieve the above purpose, the utility model provides a gas sampling water blocking filter, the overall structure of the gas sampling water blocking filter is hollow cylindrical, including connecting assembly, the connecting assembly is connected with external hose through quick coupling, the connecting assembly bottom is connected with filter assembly through screw thread, the connecting assembly and filter assembly are equipped with hydrophobic filter sheet, the filter assembly bottom is connected with air inlet water blocking assembly through screw thread, and the filter assembly and air inlet water blocking assembly are equipped with second rubber gasket.

[0007] Preferably, recesses are formed on both sides of the shell of the connecting assembly, the filter assembly and the air inlet water blocking assembly.

[0008] Preferably, the quick connector is arranged at the top end of the connecting assembly, the bottom of the quick connector extends into the connecting assembly through the round hole of the top end of the connecting assembly, the quick connector is fixed by a stainless steel nut, and a first rubber gasket is arranged between the quick connector and the stainless steel nut.

[0009] Preferably, the hydrophobic filter is a polytetrafluoroethylene waterproof and breathable membrane.

[0010] Preferably, the air inlet water blocking assembly comprises an inner cavity, an empty core floating ball is arranged in the inner cavity, two air inlet and drainage holes are arranged in the cavity wall at the bottom end of the inner cavity, and a base is connected to the bottom of the inner cavity.

[0011] Therefore, the gas sampling water blocking filter with the above structure has a certain weight, can be installed at the end of a sampling extension hose, can filter floating objects in air, has the advantages of air permeability, water blocking, reliable function, falling resistance, small size, simple structure, portability and easy cleaning and maintenance, can fill the blank in the domestic market and meet the practical needs of special industries.

[0012] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a perspective view of the gas sampling water blocking filter of the utility model;

[0014] Figure 2 It is a sectional view of the internal structure of the gas sampling water blocking filter of the utility model;

[0015] Figure 3 It is an elevation view of the connecting assembly of the gas sampling water blocking filter of the utility model;

[0016] Figure 4 It is a sectional view of the connecting assembly of the gas sampling water blocking filter of the utility model;

[0017] Figure 5 It is an elevation view of the filtering assembly of the gas sampling water blocking filter of the utility model

[0018] Figure 6 It is a sectional view of the filtering assembly of the gas sampling water blocking filter of the utility model;

[0019] Figure 7 It is an elevation view of the air inlet water blocking assembly of the gas sampling water blocking filter of the utility model;

[0020] Figure 8 It is a sectional view of the air inlet water blocking assembly of the gas sampling water blocking filter of the utility model;

[0021] Figure 9 The utility model relates to a gas sampling water blocking filter working principle diagram, A is normal state, B is the moment of immersion, C is the water blocking of blockage;

[0022] Reference sign: 1, connecting assembly;101, quick coupling;102, first rubber gasket;103, stainless steel nut;2, filter assembly;201, hydrophobic filter sheet;3, air inlet water blocking assembly;301, second rubber gasket;302, inner cavity;303, hollow float ball;304, air inlet drainage hole;305, base;4, recess. DETAILED DESCRIPTION

[0023] Unless otherwise defined, technical terms or scientific terms used in the utility model should be understood as the usual meaning of the person skilled in the art to which the utility model belongs. The "first", "second" and similar words used in the utility model do not represent any order, quantity or importance, but are only used to distinguish different constituent mechanisms. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, and other elements or objects are not excluded. "Connection" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] EMBODIMENT

[0025] As Figure 1 and Figure 2 The overall structure of the gas sampling water blocking filter is a hollow cylindrical shape, which is divided into connecting assembly 1, filter assembly 2 and air inlet water blocking assembly 3 from top to bottom. The main body shell is made of high-quality oil-resistant and corrosion-resistant polytetrafluoroethylene material with relatively large specific gravity. The shell is 100 mm long, 24 mm in outer diameter and 16 mm in inner diameter. The connecting assembly 1, filter assembly 2 and air inlet water blocking assembly 3 are connected by threads. The connecting part is provided with a recess 4. The connecting assembly 1 is connected with the external hose through a quick coupling 101 made of polypropylene material. The compatible hose has an outer diameter of 6 mm and an inner diameter of 4 mm. The hydrophobic filter sheet 201 is installed between the connecting assembly 1 and the filter assembly 2. The second rubber gasket 301 is installed between the filter assembly 2 and the air inlet water blocking assembly 3. The second rubber gasket 301 is 2 mm thick, 19 mm in outer diameter and 12 mm in inner diameter.

[0026] As Figure 3 and Figure 4As shown, the top of the connecting assembly 1 is provided with a quick connector 101, the bottom of the quick connector 101 extends into the connecting assembly 1 through the circular hole at the top end of the connecting assembly 1, the quick connector 101 is fixed to the top end of the connecting assembly 1 from the inside by a stainless steel nut 103, and a first rubber gasket 102 with a thickness of 1 mm is installed between the quick connector 101 and the stainless steel nut 103 to increase the air tightness.

[0027] As shown in Figure 5 and Figure 6 , the top of the filter assembly 2 is provided with a hydrophobic filter 201, which is a piece of polytetrafluoroethylene waterproof and breathable membrane, which can filter floating impurities and dust in the gas and prevent water from splashing.

[0028] As shown in Figure 7 and Figure 8 , the air inlet water blocking assembly 3 includes a second rubber gasket 301 arranged at the top, below which is an inner cavity 302, and a hollow floating ball 303 is placed in the inner cavity 302, which can move freely, the hollow floating ball 303 is made of polypropylene material and is light in weight, the diameter of the hollow floating ball 303 is 15 mm, the diameter of the inner cavity 302 is 16 mm, and there is a gap of 1 mm between them, which can meet the requirements of gas flow, two air inlet and drainage holes 304 with a diameter of 5 mm are arranged on the cavity wall at the bottom end of the inner cavity 302, and a base 305 is connected to the bottom of the inner cavity 302, the base 305 is a 20 mm solid structure, which can increase the weight of the bottom end of the gas sampling water blocking filter and make it stay vertical even when it is immersed in water.

[0029] Working principle: as shown in Figure 9 , the gas pump sampling is normally operated, under the action of the pumping force, the gas enters the inner cavity 302 from the two air inlet and drainage holes 304 at the bottom end of the air inlet water blocking assembly 3, passes through the hydrophobic filter 201, the quick connector 101 and the external extension hose, and reaches the gas detector for detection, which meets the requirements of gas flow. According to the actual measurement of the sample, only when the gas flow exceeds 13-14 L / min or more, the hollow floating ball 303 can be separated from the bottom and rise to form a block with the rubber ring inlay. The conventional gas detection pump suction flow is only 0.5-1 L / min, which is much smaller than the flow that can push the hollow floating ball 303 to rise, so normal use can meet the requirements, but when the water blocking filter is placed horizontally or upside down, it will form a blockage, affecting the air sampling.

[0030] When the gas sampling water-blocking filter is accidentally contacted or soaked in water, water enters the inner cavity 302 from the two air inlet drain holes 304 at the bottom end of the air inlet water-blocking assembly 3, and the hollow core floating ball 303 is lifted up and tightly inlaid with the second rubber gasket 301 under the action of water buoyancy to form a blockage, thereby blocking water from continuing to be sucked, triggering the pump blockage alarm of the gas detector (a function provided by the instrument equipment) to automatically stop the pumping action, thereby playing a role in protecting the gas detector. After the blockage blockage occurs, the water-blocking filter only needs to be lifted out of the water surface, and the accumulated water in the interior can be automatically discharged from the air inlet drain hole 304, and the hollow core floating ball 303 is separated from the rubber gasket and falls back to the bottom under the action of gravity, thereby restoring the normal sampling function of the gas sampling water-blocking filter.

[0031] Therefore, the gas sampling water-blocking filter with the above structure adopts the principle that the object with smaller density than liquid will float in liquid, and prevents the gas detector from entering water in a source blockage and blockage manner, and has the advantages of reliable function, drop resistance, small size, simple structure, portability and easy cleaning and maintenance, in addition, each component is made of material with strong chemical stability, oil resistance and corrosion resistance, and generally will not react with the gas type detected by the gas detector.

[0032] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model and not to limit them, although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the technical solutions of the utility model can still be modified or replaced, and these modifications or replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the utility model.

Claims

1. A gas sampling water-blocking filter, characterized by: The overall structure of the gas sampling water-blocking filter is hollow cylindrical, comprising a connecting assembly connected with an external hose through a quick coupling joint, a filtering assembly threadedly connected to the bottom of the connecting assembly, a hydrophobic filter sheet installed between the connecting assembly and the filtering assembly, and an air inlet water-blocking assembly threadedly connected to the bottom of the filtering assembly, with a second rubber gasket installed between the filtering assembly and the air inlet water-blocking assembly.

2. A water-blocking filter for gas sampling according to claim 1, characterized in that: Grooves are formed on both sides of the shell of the connecting assembly, the filtering assembly and the air inlet water-blocking assembly.

3. A water-blocking filter for gas sampling according to claim 1, characterized in that: The quick coupling joint is arranged at the top end of the connecting assembly, with the bottom of the quick coupling joint penetrating into the connecting assembly through a circular hole at the top end of the connecting assembly, and the quick coupling joint is fixed by a stainless steel nut, with a first rubber gasket installed between the quick coupling joint and the stainless steel nut.

4. The water-blocking filter for gas sampling according to claim 1, wherein: The hydrophobic filter sheet is a polytetrafluoroethylene waterproof and breathable membrane sheet.

5. The water-blocking filter for gas sampling according to claim 1, wherein: The air inlet water-blocking assembly comprises an inner cavity, with a hollow floating ball placed in the inner cavity, two air inlet and drainage holes formed in the cavity wall at the bottom end of the inner cavity, and a base connected to the bottom of the inner cavity.

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