Filter for VOC gas detection

Abstract

The utility model discloses a filter for VOC (volatile organic compound) gas detection, which comprises a first conversion tube, one end of the first conversion tube is connected with a gas inlet of gas detection equipment, a connecting tube is fixedly arranged on the side surface of the other end of the first conversion tube, and the connecting tube is connected with a filter component; the filter assembly comprises a shell, an air inlet channel is formed in the shell, a plurality of air inlet holes are formed in the inner wall of the air inlet channel, and a filter element is arranged between the shell and the air inlet channel; the two ends of the filter element abut against the two ends of the shell, a fan-shaped baffle is arranged in the filter element, and the two ends of the baffle are fixed to the two ends of the filter element. An air outlet is formed in the outer side of the lower end of the shell; a sealing cover is detachably connected to the end surface, close to the air outlet, of the shell; a connecting block is fixed to the outer side of the shell, and the shell is in threaded connection with the connecting pipe through the connecting block. According to the utility model, by arranging the filtering assembly, the filtering effect on gas impurities is improved, the filter element is replaced through the detachable sealing cover, and the whole filtering assembly does not need to be replaced, so that the cost is better saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas detection and filtering, and in particular relates to a filter for VOC gas detection. Background Art

[0002] Volatile organic compounds refer to organic compounds that have a high saturated vapor pressure (greater than 13.33Pa) under standard conditions, a low boiling point, a small molecular weight, and are easy to volatilize at room temperature. The English abbreviation is VOC. This substance is one of the main pollutants in the atmosphere. Volatile organic compounds are usually divided into several categories, such as non-methane hydrocarbons (abbreviated as NMHCs), oxygen-containing organic compounds, halogenated hydrocarbons, nitrogen-containing organic compounds, and sulfur-containing organic compounds. Volatile organic compounds participate in the formation of ozone and secondary aerosols in the atmospheric environment, and have an important impact on regional atmospheric ozone pollution and PM2.5 pollution. Most volatile organic compounds have a special unpleasant odor and are toxic, irritating, teratogenic and carcinogenic. In particular, benzene, toluene and formaldehyde can cause great harm to human health. Volatile organic compounds are important precursors that cause urban haze and photochemical smog, and are mainly derived from coal chemical industry, petrochemical industry, fuel coating manufacturing, solvent manufacturing and use, and other processes.

[0003] VOC gas monitoring is generally carried out using a VOC gas detector. The gas detector is generally equipped with an air suction pump, which sucks the VOC gas into the detector for detection through pump suction. However, particulate impurities mixed with the VOC gas are sucked into the gas detector together, which has a great impact on the detection results. In addition, during long-term use, particulate matter is easy to accumulate in the air intake pipe and on the sensor of the detector, which is difficult to clean. Utility Model Content

[0004] Based on the above background, the purpose of the utility model is to provide a filter for VOC gas detection.

[0005] In order to achieve the above objectives, the utility model adopts the following technical solutions:

[0006] A filter for VOC gas detection, comprising a first conversion tube, one end of which is connected to the air inlet of a gas detection device, and a connecting tube is fixedly provided on the side of the other end of the first conversion tube, and the connecting tube is connected to a filter assembly;

[0007] The filter assembly comprises a shell, an air inlet channel is arranged in the shell, a plurality of air inlet holes are opened on the inner wall of the air inlet channel, a filter element is arranged between the shell and the air inlet channel; two ends of the filter element are in contact with two ends of the shell, a fan-shaped baffle is arranged in the filter element, and two ends of the baffle are fixed to two ends of the filter element; the baffle can extend the flow path of the gas in the filter element, increase the filtering time, and improve the filtering effect;

[0008] The side surface of the shell near one end of the first conversion tube is provided with an air outlet, and the filtered gas enters the connecting pipe from the air outlet. The end surface of the shell near the air outlet is detachably connected with a sealing cover for sealing the air inlet channel;

[0009] A connecting block is fixed on the outer side of the shell, a thread is arranged on the connecting block, a thread corresponding to the connecting block is arranged on the inner wall of the connecting pipe, and the shell and the connecting pipe are connected with each other through the thread of the connecting block.

[0010] Preferably, the air outlets are provided in a plurality and are evenly distributed in a circular array with the axis of the shell as the center. Providing a plurality of air outlets can increase the speed of air flow.

[0011] Preferably, a plurality of baffles are provided, which are evenly distributed in a circular array with the axis of the filter element as the center, and there are gaps between adjacent baffles.

[0012] Preferably, the baffle is provided with two layers along the radial direction of the filter element, and the two layers of baffles are staggered. The baffles on both sides are staggered, and the gas can only pass through the gap between the baffles, which further extends the gas passage route and improves the filtering effect of the filter element on gas impurities.

[0013] Preferably, the sealing cover is provided with a first slider, the inner wall of the air inlet channel is provided with an L-shaped slide groove, and the first slider is slidably connected to the L-shaped slide groove; when the filter element no longer has the filtering function, the housing is opened by rotating the sealing cover, and the filter element can be replaced and continued to be used.

[0014] Preferably, a sealing gasket is provided on the top of the connecting block, and the sealing gasket is made of silicone material and is used to seal the connection between the connecting pipe and the shell.

[0015] Preferably, a sealing strip is provided on the outer ring of the sealing gasket, and the sealing strip can cover the periphery of the connecting pipe to improve the sealing effect.

[0016] Preferably, two connecting tubes are provided on the first conversion tube, and the two connecting tubes are symmetrically distributed along the radial direction of the first conversion tube with the axis as the center. A second conversion tube is provided in the first conversion tube, and the second conversion tube is rotatably connected to the first conversion tube. The end of the second conversion tube away from the detection device is sealed, and a through hole is opened on the second conversion tube, and the through hole is coaxially arranged with the two connecting tubes. The air intake passage can be adjusted by rotating the second conversion tube.

[0017] Preferably, a rotating rod is provided at one end of the second conversion tube seal, and the other end of the rotating rod extends out of the end surface of the first conversion tube and is connected to a rotating handle. The rotating handle is a straight rod. When the filter component needs to be replaced, the rotating handle is rotated 180 degrees to open another group of filter components for filtering.

[0018] Preferably, a second slider is provided on the outer side of one end of the second conversion tube away from the seal, the second slider is a circular ring, a circular groove is provided on the inner wall of the first conversion tube, the second slider is slidably connected to the circular groove, and the connection between the second slider and the circular groove improves both the stability of the connection between the second conversion tube and the first conversion tube 1 and the sealing.

[0019] The utility model has the following beneficial effects:

[0020] 1. There are two layers of baffles in the filter element. Each layer of baffles is provided with several baffles and there are gaps between adjacent baffles. The two layers of baffles are staggered. After the gas enters the filter element from the air inlet channel, it can only flow through the gaps after being blocked by the baffles, which further extends the route for the gas to pass through and improves the filtering effect of the filter element on gas impurities.

[0021] 2. Two connecting tubes and two groups of filter components are provided on the first conversion tube. When the filtering function of one group of filter components does not meet the standard, the other group of filter components can be directly replaced by rotating the through-hole position of the second conversion tube to perform filtering work. At this time, the staff can replace the filter element of the first group of filter components, which improves the use efficiency of the equipment and makes the work more convenient and effective.

[0022] 3. The sealing cover is slidably connected to the air inlet passage through a slider. When the filter element needs to be replaced, the sealing cover is turned to open the housing to replace the filter element without replacing the entire filter assembly, which saves costs better. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the internal structure of the utility model;

[0025] Figure 2 It is a three-dimensional structural schematic diagram of the filter assembly and the connecting block of the utility model;

[0026] Figure 3 For the utility model Figure 2 Schematic diagram of the internal structure from a top view;

[0027] Figure 4 This is a schematic diagram of the internal three-dimensional structure of the filter assembly of the utility model;

[0028] Figure 5 It is a schematic diagram of the disassembled three-dimensional structure of the sealing cover and the housing of the utility model;

[0029] Figure 6 It is a schematic diagram of the split three-dimensional structure of the first conversion tube and the second conversion tube of the utility model;

[0030] Figure 7 A schematic diagram of a split three-dimensional structure of the first conversion tube and the second conversion tube of the utility model from another perspective;

[0031] Figure 8 It is a three-dimensional structural schematic diagram of the utility model.

[0032] Wherein: 1. The first conversion tube;

[0033] 2. Connecting pipe;

[0034] 3. Filter assembly; 31. Housing; 32. Air inlet channel; 33. Filter element; 34. Air outlet; 35. Sealing cover; 36. Baffle; 37. First slider; 38. L-shaped slide; 321. Air inlet;

[0035] 4. Connecting block; 41. Sealing pad; 42. Sealing strip;

[0036] 5. Second conversion tube; 51. Through hole; 52. Rotating rod; 53. Rotating handle; 54. Second sliding block; 55. Circular sliding groove. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0040] like Figure 1-8 As shown, a filter for VOC gas detection includes a first conversion tube 1, one end of which is connected to the air inlet of a gas detection device, and a connecting tube 2 is fixedly provided on the side of the other end of the first conversion tube 1, and the connecting tube 2 is connected to a filter assembly 3;

[0041] The filter assembly 3 includes a housing 31, an air inlet channel 32 is provided in the housing 31, a plurality of air inlet holes 321 are provided on the inner wall of the air inlet channel 32, a filter element 33 is provided between the housing 31 and the air inlet channel 32; two ends of the filter element 33 are in contact with two ends of the housing 31, a fan-shaped baffle 36 is provided in the filter element 33, and two ends of the baffle 36 are fixed to two ends of the filter element 33; the baffle 36 can extend the flow path of the gas in the filter element 33, increase the filtering time, and improve the filtering effect;

[0042] The shell 31 is provided with an air outlet 34 on the side near one end of the first conversion tube 1, and the filtered gas enters the connecting tube 2 from the air outlet 34. The end surface of the shell 31 near the air outlet 34 is detachably connected with a sealing cover 34 for sealing the air inlet passage;

[0043] A connecting block 4 is fixed to the outer side of the shell 31 . The connecting block 4 is provided with threads. The inner wall of the connecting pipe 2 is provided with threads corresponding to the connecting block 4 . The shell 31 is threadedly connected to the connecting pipe 2 via the connecting block 4 .

[0044] The gas enters from the air inlet hole 321 of the air inlet channel 32, and the particulate impurities in the gas are filtered out by the filter element 33. The gas encounters the baffle 36 during the process of passing through the filter element 33 and cannot flow. It needs to flow from both sides of the baffle 36, thereby extending the flow route of the gas in the filter element 33, increasing the filtering time, and improving the filtering effect. The filtered gas flows into the connecting pipe 2 from the air outlet 34 at the lower end of the shell 31, then enters the first conversion tube 1, and finally enters the detection equipment for detection.

[0045] Preferably, the air outlets 34 are provided in a plurality and are evenly distributed in a circular array with the axis of the shell 31 as the center. Providing a plurality of air outlets 34 can increase the speed of air flow.

[0046] Preferably, a plurality of baffles 36 are provided, which are evenly distributed in a circular array with the axis of the filter element 33 as the center, and there are gaps between adjacent baffles 36 .

[0047] Preferably, the baffle 36 is provided with two layers along the radial direction of the filter element 33, and the two layers of baffles 36 are staggered. The baffles 36 on both sides are staggered, and the gas can only pass through the gaps between the baffles 36, further extending the gas passage route and improving the filtering effect of the filter element 33 on gas impurities.

[0048] Preferably, the sealing cover 35 is provided with a first slider 37, the inner wall of the air inlet channel 32 is provided with an L-shaped slide groove 38, and the first slider 37 is slidably connected with the L-shaped slide groove 38; when the filter element 33 no longer has the filtering function, the housing 31 is opened by rotating the sealing cover 35, and the filter element 33 is replaced and continued to be used.

[0049] Preferably, a sealing gasket 41 is provided on the top of the connecting block 4 . The sealing gasket 41 is made of silicone and is used to seal the connection between the connecting pipe 2 and the housing 3 .

[0050] Preferably, a sealing strip 42 is provided on the outer ring of the sealing gasket 41, and the sealing strip 42 can cover the periphery of the connecting pipe 2 to improve the sealing effect.

[0051] Preferably, two connecting tubes 2 are provided on the first conversion tube 1, and the two connecting tubes 2 are symmetrically distributed along the radial direction of the first conversion tube 2 with the axis as the center. A second conversion tube 5 is provided in the first conversion tube 1, and the second conversion tube 5 is rotatably connected to the first conversion tube 1. The end of the second conversion tube 5 away from the detection device is sealed, and a through hole 51 is opened on the second conversion tube 5, and the through hole 51 is coaxially arranged with the two connecting tubes 2. The air intake passage can be adjusted by rotating the second conversion tube 5. Two groups of conversion tubes 2 and filter assemblies 3 are arranged on the first conversion tube 1. The second conversion tube 5 is rotated to adjust the gas to enter the detection device from one group of filter assemblies 3. When the filtering effect of the filter element 33 of this group is not up to standard, the second conversion tube 5 is rotated to make the through hole 51 align with the connecting tube 2 of another group. At this time, the previous filter assembly 3 can be removed and the filter element can be replaced without stopping the equipment, thereby improving the filtering efficiency of the detection gas.

[0052] Preferably, a rotating rod 52 is provided at one sealed end of the second conversion tube 5, and the other end of the rotating rod 52 extends out of the end surface of the first conversion tube 1 and is connected to a rotating handle 53. The rotating handle 53 is a straight rod. When the filter assembly 3 needs to be replaced, the rotating handle 53 is rotated 180 degrees to open another group of filter assemblies 3 for filtering.

[0053] Preferably, a second slider 54 is provided on the outer side of one end of the second conversion tube 5 away from the seal, and the second slider 54 is a circular ring. A circular groove 55 is provided on the inner wall of the first conversion tube 1, and the second slider 54 is slidably connected to the circular groove 55. Through the connection between the second slider 54 and the circular groove 55, the stability of the connection between the second conversion tube 5 and the first conversion tube 1 is improved, and the sealing is also improved.

[0054] The working principle of the utility model is as follows: when in use, the second conversion tube 5 is rotated to align the through hole 51 with one of the connecting tubes 2. When the detection device is started, the gas enters the filter element 33 from the air inlet hole 321 of the air inlet channel 32. The filter element 33 filters the particulate impurities in the gas. Two layers of baffles 36 are provided in the filter element 33, and the two layers of baffles 36 are staggered. The gas flows through the first layer of baffles 36 and is blocked, and continues to flow from the gap between the adjacent baffles 36. It is blocked again by the second layer of baffles 36 and flows from the gap between the second layer of baffles 36 to the gas outlet 34. The baffles 36 greatly prolong the circulation time of the gas and improve the filtering effect of the filter element.

[0055] When the filter element 33 needs to be replaced, the handle 53 is rotated 180 degrees to the second conversion tube 5, the through hole 51 is aligned with the other connecting tube 2, and the second group of filter components 3 performs filtering work. At the same time, the first group of filter components 3 can be removed to replace the filter element without stopping the detection equipment, thereby improving the filtering efficiency.

[0056] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A filter for VOC gas detection, characterized in that: It comprises a first conversion tube, one end of which is connected to the air inlet of the gas detection device, and a connecting tube is fixedly arranged on the side of the other end of the first conversion tube, and the connecting tube is connected to a filter assembly; The filter assembly comprises a housing, an air inlet passage is arranged in the housing, a plurality of air inlet holes are opened on the inner wall of the air inlet passage, a filter element is arranged between the housing and the air inlet passage; two ends of the filter element are in contact with two ends of the housing, a fan-shaped baffle is arranged in the filter element, and two ends of the baffle are fixed to two ends of the filter element; An air outlet is provided on the side of the shell near one end of the first conversion tube, and a sealing cover is detachably connected to the end surface of the shell near the air outlet; A connecting block is fixed on the outer side of the shell, a thread is arranged on the connecting block, a thread corresponding to the connecting block is arranged on the inner wall of the connecting pipe, and the shell and the connecting pipe are connected with each other through the thread of the connecting block.

2. The filter for VOC gas detection according to claim 1, characterized in that: The air outlets are provided in a plurality and are evenly distributed in a circular array with the axis of the shell as the center.

3. The filter for VOC gas detection according to claim 1, characterized in that: A plurality of baffles are provided, which are evenly distributed in a circular array with the axis of the filter element as the center, and there are gaps between adjacent baffles.

4. The filter for VOC gas detection according to claim 3, characterized in that: The baffles are arranged in two layers along the radial direction of the filter element, and the two layers of baffles are distributed alternately.

5. The filter for VOC gas detection according to claim 1, characterized in that: The sealing cover is provided with a first sliding block, the inner wall of the air inlet channel is provided with an L-shaped sliding groove, and the first sliding block is slidably connected with the L-shaped sliding groove.

6. The filter for VOC gas detection according to claim 1, characterized in that: A sealing gasket is arranged on the top of the connecting block.

7. The filter for VOC gas detection according to claim 6, characterized in that: The outer ring of the sealing gasket is provided with a sealing strip, and the sealing strip covers the periphery of the connecting pipe.

8. The filter for VOC gas detection according to any one of claims 1 to 7, characterized in that: Two connecting tubes are provided on the first conversion tube, and the two connecting tubes are symmetrically distributed along the radial axis of the first conversion tube as the center. A second conversion tube is provided in the first conversion tube, and the second conversion tube is rotatably connected to the first conversion tube. The end of the second conversion tube away from the detection device is sealed, and a through hole is opened on the second conversion tube, and the through hole is coaxially arranged with the two connecting tubes.

9. The filter for VOC gas detection according to claim 8, characterized in that: A rotating rod is provided at one sealed end of the second conversion tube, and the other end of the rotating rod extends out of the end surface of the first conversion tube and is connected to a rotating handle, which is a straight rod.

10. The filter for VOC gas detection according to claim 9, characterized in that: A second slider is disposed on the outer side of one end of the second conversion tube away from the seal, the second slider is a circular ring, a circular slide groove is provided on the inner wall of the first conversion tube, and the second slider is slidably connected to the circular slide groove.

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