A filter assembly for a dust sampler

Abstract

The utility model discloses a filter assembly of dust sampler relates to dust sampling technical field. The utility model discloses a filter assembly main part, and the upper wall of fixed ring is equipped with filter membrane, and the top of filter membrane is equipped with the mounting ring, and the lower wall of mounting ring is uniformly fixed with the connecting strip, and the position of connecting strip is equipped with the slot no. 2 and the slot no. 3 respectively on filter membrane and fixed ring, and the slot no. 2 is equipped with the gap on the filter membrane of the side of clockwise direction, and the lower end of connecting strip is fixed with the blocking strip below fixed ring, and the connecting assembly is equipped with the hose below the mounting box, and the inside of upper and lower ends of hose is equipped with the conical part, and the one end of conical part is fixed with the connecting pipe away from the hose, and the outside of upper and lower ends of hose is equipped with the fastening head. The utility model discloses the cooperation of gap and blocking strip makes in the disassembly filter membrane, and can drive filter membrane to separate from mounting box through the disassembly mounting ring, and the cooperation of conical part and arc portion in fastening head avoids the hose to fall off.

Description

Technical Field

[0001] This utility model belongs to the field of dust sampling technology, and in particular relates to a filter component of a dust sampler. Background Technology

[0002] A dust sampler is a device used to measure the concentration of dust in the air. Its main function is to collect dust in air samples and analyze the samples to assess air quality and worker health risks. Its principle is to trap dust particles through a filter membrane and calculate the concentration based on the increase in the filter membrane volume after sampling. The dust sampler mainly consists of a dust sampler main unit, a connecting hose, and a filter assembly. The filter assembly contains a filter membrane. The dust sampler main unit generates negative pressure to allow airflow from the external environment to carry dust through the filter membrane to collect the dust. The dust on the filter membrane is then weighed to calculate the dust content in the air. However, existing dust samplers are inconvenient to use because the filter membrane is made of soft and thin material, requiring tweezers to remove it. Furthermore, the hoses in the existing technology rely on their own elasticity to connect to the air inlet and filter components of the dust sampler, making them prone to detachment during use.

[0003] To address these issues, we provide a filter assembly for a dust sampler. Utility Model Content

[0004] The purpose of this utility model is to provide a filter assembly for a dust sampler. The combination of the notch and the baffle allows the filter membrane to be detached from the mounting box when the mounting ring is removed. The cooperation between the conical part and the arc-shaped part in the fastening head prevents the hose from falling off. This solves the problems of the prior art, which requires tweezers to remove the filter membrane, making the operation inconvenient. In addition, the prior art relies on the hose's own elasticity to connect to the air inlet of the dust sampler and the filter assembly, which makes the hose easy to fall off during use, causing inconvenience.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to a filter assembly for a dust sampler, comprising a filter assembly body, which includes a mounting box. A fixing ring is fixed to the inner wall of the mounting box, a filter membrane is provided on the upper wall of the fixing ring, and a mounting ring is provided above the filter membrane. A connecting strip is uniformly fixed to the lower wall of the mounting ring. A through groove two and a through groove three are respectively opened on the filter membrane and the fixing ring at the position of the connecting strip. A notch is opened on the filter membrane on the clockwise side of the through groove two. A stop bar located below the fixing ring is fixed to the lower end of the connecting strip. A connecting assembly includes a flexible tube located below the mounting box. Both the upper and lower ends of the flexible tube have tapered portions inside. A connecting tube is fixed to the end of the tapered portion away from the flexible tube. Fastening heads are provided on the outside of the upper and lower ends of the flexible tube.

[0006] The present invention is further configured such that a bevel is provided on the symmetrical side of the lower end of the baffle, and a chamfer is provided on the counterclockwise end of the upper wall of the baffle.

[0007] The present invention is further provided with an elastic pad between the mounting ring and the filter membrane, and a through groove is provided on the elastic pad at the location of the connecting strip.

[0008] The present invention is further provided with an end cap on the outside of the mounting ring, and a sealing gasket is fixed on the upper wall inside the end cap.

[0009] The present invention is further configured such that elastic sheets are symmetrically fixed on the outer peripheral wall of the end cap, and a boss is fixed on the lower end of the outer side wall of the elastic sheet. The cross-section of the boss is a right-angled triangle, and the upper wall of the boss is provided with a U-shaped frame that is fixed to the mounting box.

[0010] The present invention is further provided that the lower wall of the mounting box has a through hole.

[0011] The present invention is further configured such that the fastening head is threadedly connected to the corresponding connecting pipe, the connecting pipe located on the upper side is fixedly connected to the lower wall of the corresponding mounting box outside the perforation, and the connecting pipe located on the lower side is fixedly connected to the air inlet end of the dust sampler.

[0012] The present invention is further configured such that a tube is fixed at one end of the tapered portions close to each other, and an arc-shaped portion is provided on the fastening head corresponding to the tapered portion, and an anti-slip ridge is provided on the outer peripheral wall of the fastening head.

[0013] This utility model has the following beneficial effects: 1. By setting a notch and a baffle, when disassembling the filter membrane, the baffle is positioned directly below the through groove three by operating the mounting ring. Moving the mounting ring upward causes both the connecting strip and the baffle to move upward. During this process, when the upper wall of the baffle contacts the filter membrane, the filter membrane is driven upward and detached from the mounting box under the continuous upward movement of the mounting ring. Compared with the prior art, there is no need to use a clamping tool to clamp out the filter membrane, making the operation more convenient. 2. This utility model, by setting a conical part, an arc-shaped part and a fastening head, allows the two ends of the hose to be sleeved on the outside of the conical part in use. With the fastening head and the corresponding connecting pipe in a threaded connection state, the arc-shaped part applies a force to the hose in the direction of the conical part, using the arc-shaped part to make the hose press against the conical part, thereby achieving the effect of preventing the hose from falling off, making it more convenient to use. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is an overall structural diagram of the filter assembly of a dust sampler; Figure 2 This is a diagram showing the internal structure of a filter assembly in a dust sampler. Figure 3 This is a structural diagram of the main body of the filter component; Figure 4 This is an exploded structural diagram of the main body of the filter component; Figure 5 This is a structural diagram of the connecting components; Figure 6 This is an exploded structure diagram of the connecting components; Figure 7 This is a structural diagram of the fastening head; The attached diagram lists the components represented by each number as follows: 1-Filter assembly body, 101-Elastic sheet, 101a-Boss, 102-Elastic pad, 102a-Gate one, 103-Filter membrane, 103a-Gate two, 103b-Notch, 104-Mounting box, 104a-U-shaped frame, 104b-Perforation, 105-End cap, 105a-Sealing gasket, 106-Mounting ring, 107-Fixing ring, 107a-Gate three, 108-Connecting strip, 109-Stop strip, 109a-Bevel, 109b-Chamfer, 2-Connecting assembly, 201-Hose, 202-Connecting tube, 203-Fastening head, 203a-Anti-slip ridge, 203b-Arc-shaped part, 204-Conical part, 205-Insertion tube. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Example 1

[0016] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 This is the first embodiment of the present invention, which provides a filter assembly for a dust sampler. The filter assembly body 1 includes a mounting box 104. A fixing ring 107 is fixed to the inner wall of the mounting box 104. A filter membrane 103 is provided on the upper wall of the fixing ring 107 for filtering and collecting airborne dust through the filter membrane 103. A mounting ring 106 is provided above the filter membrane 103. Connecting strips 108 are uniformly fixed to the lower wall of the mounting ring 106. A second through groove 103a and a third through groove 107a are respectively formed on the filter membrane 103 and the fixing ring 107 at the positions of the connecting strips 108. The length of the second through groove 103a is less than the length of the third through groove 107a. The size of the through groove 3 107a is slightly larger than the size of the baffle 109 so that the baffle 109 can pass through the through groove 3 107a. A notch 103b is opened on the filter membrane 103 on the clockwise side of the through groove 2 103a. The cooperation between the notch 103b and the through groove 2 103a allows the baffle 109 to pass through the filter membrane 103. The lower end of the connecting strip 108 is fixed with a baffle 109 located below the fixing ring 107. After the baffle 109 is located below the through groove 3 107a, the mounting ring 106 is turned counterclockwise so that the upper wall of the baffle 109 contacts the lower wall of the fixing ring 107. At this time, the mounting ring 106 and the fixing ring 107 are in a relatively fixed state, realizing the installation of the filter membrane 103. Specifically, the lower end of the baffle 109 has a symmetrical inclined surface 109a. When installing the filter membrane 103, with the mounting ring 106 disengaged from the mounting box 104, the mounting ring 106 is operated to allow the baffle 109 to pass through the through groove 103a and the notch 103b. At this time, the inclined surface 109a facilitates the baffle 109 to pass through the through groove 103a and the notch 103b. The upper wall of the baffle 109 has a chamfer 109b at the counterclockwise end. After the baffle 109 moves to the bottom of the through groove 107a, the chamfer 109 can rotate counterclockwise until the upper wall of the baffle 109 contacts the lower wall of the fixing ring 107. An elastic pad 102 is provided between the mounting ring 106 and the filter membrane 103. The elastic pad 102 has elastic properties, which allows the mounting ring 106 to squeeze the elastic pad 102, thereby squeezing the filter membrane 103 and fixing the filter membrane 103. A through groove 102a is provided on the elastic pad 102 at the location of the connecting strip 108 to provide space for the connecting strip 108 to pass through the elastic pad 102. An end cap 105 is provided on the outside of the mounting ring 106. A sealing gasket 105a is fixed on the upper wall inside the end cap 105. By covering the outside of the mounting ring 106 with the end cap 105, the dust sample can be sealed and protected after dust collection and before being sent to the laboratory for weighing, so as to avoid dust leakage and inaccurate data. The outer peripheral wall of the end cap 105 is symmetrically provided with elastic pieces 101. The lower end of the outer side wall of the elastic piece 101 is provided with a boss 101a. The cross-section of the boss 101a is arranged in a right-angled triangle. The upper wall of the boss 101a is provided with a U-shaped frame 104a that is fixed to the mounting box 104. With the above arrangement, the end cap 105 can be removed by pressing the lower end of the elastic piece 101 towards the end cap 105 and then moving the end cap 105 upward to separate the boss 101a from the U-shaped frame 104a. The lower wall of the mounting box 104 has a through hole 104b, through which the internal space of the hose 201 communicates with the internal space of the mounting box 104; The operation process of this embodiment is as follows: When disassembling the filter membrane 103, the lower end of the elastic sheet 101 is pressed towards the mounting box 104, and then the end cover 105 is moved upward to disassemble the end cover 105. Then, the mounting ring 106 is rotated clockwise to drive the connecting strip 108 and the baffle 109 to rotate, so that the baffle 109 is located directly below the through groove 107a. At this time, the mounting ring 106 is moved upward to drive the baffle 109 to move upward. At this time, the filter membrane 103 moves upward. Then, the filter membrane 103 is moved downward so that the baffle 109 passes through the through groove 103a and the notch 103b until the filter membrane 103 is separated from the baffle 109, thus realizing the disassembly operation of the filter membrane 103. When installing the filter membrane 103, operate the filter membrane 103 so that the second through groove 103a and the notch 103b are aligned with the baffle 109. Operate the filter membrane 103 so that the baffle 109 passes through the second through groove 103a and the notch 103b, so that the filter membrane 103 is between the baffle 109 and the elastic pad 102. At this time, operate the mounting ring 106 so that the baffle 109 is directly above the third through groove 107a. Control the mounting ring 106 to move down so that the baffle 109 passes through the third through groove 107a. Then rotate the mounting ring 106 counterclockwise until the upper wall of the baffle 109 abuts against the lower wall of the fixing ring 107. The filter assembly body 1 can perform dust filtration and collection operations when it is in this state. After the dust is filtered and collected, the lower end of the elastic piece 101 is passed through the U-shaped frame 104a by operating the end cap 105 until the end cap 105 is prevented from falling off with the cooperation of the boss 101a, thus preventing dust leakage during the transportation of the dust sampler. Example 2

[0017] Please see Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7 This is the second embodiment of the present invention. This embodiment is based on the previous embodiment, but differs from the first embodiment in that: the connecting component 2 includes a flexible hose 201 located below the mounting box 104. The upper and lower ends of the flexible hose 201 are provided with tapered portions 204. A connecting pipe 202 is fixed to the end of the tapered portion 204 away from the flexible hose 201. Fastening heads 203 are provided on the outside of the upper and lower ends of the flexible hose 201. The fastening heads 203 are threadedly connected to the corresponding connecting pipes 202, so that the arc-shaped portion 203b applies a squeezing force in the direction of the tapered portion 204 to the flexible hose 201, thereby achieving the effect of preventing the flexible hose 201 from falling off. Specifically, the fastening head 203 is threadedly connected to the corresponding connecting pipe 202. The connecting pipe 202 located on the upper side is fixedly connected to the lower wall of the corresponding mounting box 104 outside the perforation 104b. The connecting pipe 202 located on the lower side is fixedly connected to the air inlet end of the dust sampler. With the above settings, when the dust sampler is working, both the hose 201 and the filter assembly body 1 are under negative pressure, allowing outside air to carry dust into the filter assembly body 1 for dust filtration and collection. A cannula 205 is fixed at one end of the tapered portions 204 close to each other. An arc-shaped portion 203b is provided on the fastening head 203 corresponding to the tapered portion 204. The interiors of the cannula 205, the arc-shaped portion 203b and the connecting tube 202 are all connected. An anti-slip ridge 203a is provided on the outer peripheral wall of the fastening head 203 to increase the friction force when operating the fastening head 203. The operation process of this embodiment is as follows: when both the dust sampler and the filter assembly body 1 are connected to the hose 201, the end of the hose 201 is inserted into the outside of the insertion tube 205, and then the end of the hose 201 is continuously moved towards the conical part 204 so that the end of the hose 201 is located outside the conical part 204. At this time, the fastening head 203 sleeved on the outside of the hose 201 is threadedly connected to the connecting tube 202 until the arc-shaped part 203b applies a squeezing force to the end of the hose 201 towards the conical part 204, so that the hose 201 is stably fixed outside the conical part 204.

[0018] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A filter assembly for a dust sampler, comprising a filter assembly body (1), characterized in that: The filter assembly body (1) includes a mounting box (104). A fixing ring (107) is fixedly provided on the inner wall of the mounting box (104). A filter membrane (103) is provided on the upper wall of the fixing ring (107). A mounting ring (106) is provided above the filter membrane (103). A connecting strip (108) is uniformly fixed on the lower wall of the mounting ring (106). A through groove two (103a) and a through groove three (107a) are respectively opened on the filter membrane (103) and the fixing ring (107) at the location of the connecting strip (108). A notch (103b) is opened on the filter membrane (103) on the clockwise side of the through groove two (103a). A stop strip (109) located below the fixing ring (107) is fixedly provided at the lower end of the connecting strip (108). The connecting component (2) includes a flexible tube (201) located below the mounting box (104). The upper and lower ends of the flexible tube (201) are provided with tapered portions (204). A connecting tube (202) is fixed at the end of the tapered portion (204) away from the flexible tube (201). Fastening heads (203) are provided on the outside of the upper and lower ends of the flexible tube (201).

2. The filter assembly of a dust sampler according to claim 1, characterized in that: The lower end of the baffle (109) has a symmetrical bevel (109a) and the upper wall of the baffle (109) has a chamfer (109b) in the counterclockwise direction.

3. The filter assembly of a dust sampler according to claim 1, characterized in that: An elastic pad (102) is provided between the mounting ring (106) and the filter membrane (103), and a through groove (102a) is provided on the elastic pad (102) corresponding to the location of the connecting strip (108).

4. The filter assembly of a dust sampler according to claim 1, characterized in that: The mounting ring (106) is provided with an end cap (105) on the outside, and a sealing gasket (105a) is fixed on the upper wall inside the end cap (105).

5. The filter assembly of a dust sampler according to claim 4, characterized in that: The outer peripheral wall of the end cap (105) is symmetrically provided with elastic sheets (101), and the lower end of the outer side wall of the elastic sheet (101) is provided with a boss (101a). The cross-section of the boss (101a) is arranged in a right triangle, and the upper wall of the boss (101a) is provided with a U-shaped frame (104a) that is fixed to the mounting box (104).

6. The filter assembly of a dust sampler according to claim 5, characterized in that: The lower wall of the mounting box (104) has a perforation (104b).

7. The filter assembly of a dust sampler according to claim 6, characterized in that: The fastening head (203) is threadedly connected to the corresponding connecting pipe (202). The connecting pipe (202) located on the upper side is fixedly connected to the lower wall of the corresponding mounting box (104) outside the perforation (104b). The connecting pipe (202) located on the lower side is fixedly connected to the air inlet end of the dust sampler.

8. The filter assembly of a dust sampler according to claim 7, characterized in that: The conical portions (204) are fixed with insertion tubes (205) at one end close to each other. The fastening head (203) corresponding to the conical portion (204) is provided with an arc-shaped portion (203b). The outer peripheral wall of the fastening head (203) is provided with anti-slip ridges (203a).

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