Novel plankton sampling head and sampler

Abstract

The utility model discloses a novel plankton sampling head, including bottom plate, the bottom plate middle part is provided with the air extraction hole, the air extraction hole below is provided with the fan, the air extraction hole top is provided with the mounting seat, the mounting seat is used for putting the petri dish, the mounting seat periphery is provided with at least three movable fixed clamping jaw, and at least three movable fixed clamping jaw cooperation fixed petri dish, the petri dish top is provided with the sampling distribution board, the sampling distribution board is connected with the outer protection casing, the outer protection casing cover is established in the mounting seat periphery and is sealedly connected with the bottom plate sampling space, the air extraction hole is through -connection with sampling space, the fan removes the air in sampling space from the air extraction hole, the sampling distribution board is used for the even diffusion of external air to the petri dish. The utility model can accommodate the matching petri dish of multiple types, and the operation is convenient and reliable.

Description

Technical Field

[0001] This utility model relates to the field of sampler technology, specifically to a novel airborne bacteria sampling head and sampler. Background Technology

[0002] An airborne microbial sampler is an instrument specifically designed to collect suspended microorganisms (such as bacteria and fungi) in the air. It is widely used in clean environment monitoring, medical, pharmaceutical, and food processing fields to ensure air quality meets hygiene or process standards. It primarily works by actively drawing in air and capturing airborne microorganisms onto a specific medium (such as a petri dish or filter membrane), followed by culturing or molecular detection to analyze the types and concentrations of microorganisms.

[0003] In the existing technology, the sampling head structure of the airborne bacteria sampler is generally fixed. The common size of the petri dish is 90mm. When the 90mm petri dish is used for fixed use, other sizes of petri dishes cannot be matched with the sampling head for installation. It is necessary to purchase new equipment or replace the sampling head in order to carry out the sampling operation.

[0004] Furthermore, for the existing sampling head structure, its sampling flow rate only meets the standard of 100L / min. When the flow rate is constant, the sampling time needs to be greatly increased, resulting in low efficiency. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a novel airborne bacteria sampling head and sampler that can be adapted to and matched with various types of culture dishes, and is convenient and reliable to operate.

[0006] To address the aforementioned technical problems, this utility model provides a novel airborne bacteria sampling head, comprising a base plate, an air extraction hole in the center of the base plate, a fan below the air extraction hole, and a mounting base above the air extraction hole for placing a culture dish. At least three movable fixing claws are arranged around the mounting base to secure the culture dish. A sampling distribution plate is positioned above the culture dish and connected to an outer protective shell. The outer protective shell covers the periphery of the mounting base and is sealed to the base plate to form a sampling space. The air extraction hole is connected to the sampling space.

[0007] The fan draws air out of the sampling space through the air extraction hole, and the sampling distribution plate is used to evenly diffuse the external air to the petri dish.

[0008] Furthermore, at least three pads are evenly arranged along the circumferential direction at the bottom of the mounting base, and the fixing claw is connected to the end of the pad by an adjusting screw. A spring is also provided on the surface of the adjusting screw between the fixing claw and the end of the pad.

[0009] Furthermore, the mounting base corresponding to the fixing claw is provided with a guide groove, and the fixing claw is disposed in the groove and can move along the guide direction of the guide groove.

[0010] Furthermore, the base plate includes a lower base and an upper base. The surface of the lower base is provided with a stepped groove, and the bottom of the outer periphery of the lower base is provided with an annular stepped portion. The upper base is disposed in the stepped groove and is fixedly connected to the lower base by locking screws. The surface of the upper base is provided with a connecting ring, and the outer surface of the connecting ring is threadedly connected to the inner wall of the outer protective shell. The surface of the upper base corresponding to the bottom of the outer protective shell is also provided with a sealing gasket.

[0011] Furthermore, an air inlet is provided in the middle of the outer protective shell, a recessed connecting ring is provided below the air inlet, the sampling distribution plate is fixed to the bottom of the recessed connecting ring, and a dust cover is provided on the air inlet;

[0012] The bottom of the recessed connecting ring extends into the interior of the culture dish, and a flow gap is provided between the outer periphery of the recessed connecting ring and the inner wall of the culture dish.

[0013] Furthermore, the fan is fixed on the inner bottom surface of the concave bracket, the concave bracket is locked to the bottom of the base plate, the air inlet of the fan extends into the air extraction hole and is sealed by the first sealing ring, and a positioning ring is provided on the fan surface on the outer periphery of the air inlet, the positioning ring abutting against the bottom of the base plate.

[0014] Furthermore, a second sealing ring is provided between the lower base and the upper base.

[0015] A sampler comprising the sampling head described in any one of the preceding claims.

[0016] Furthermore, it includes a sampling box, with the sampling head located on top of the sampling box, and the surface of the sampling box is provided with a control unit, a box door, and a lifting handle.

[0017] The beneficial effects of this utility model are:

[0018] The petri dishes are secured using three movable retaining clips, allowing for the secure holding of petri dishes of different sizes. This adapts to various petri dish sizes and meets customers' needs for different petri dish models. It satisfies the requirements for diverse flow rates and petri dish types, providing customers with better choices and a better experience.

[0019] When the outer protective shell is disassembled, the sampling distribution plate can be removed at the same time, making it convenient to pick up and put down the petri dish. The outer protective shell and the base plate work together to form a small sampling space. The sampling distribution plate is fixed by the sunken structure and extends into the petri dish. During the air flow, it can always hit the petri dish before flowing away, resulting in high collection efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the sampling head of this utility model;

[0021] Figure 2 This is a utility model Figure 1 A schematic diagram of the exploded structure;

[0022] Figure 3 This is a utility model Figure 1 A schematic diagram of the cross-sectional structure;

[0023] Figure 4 This is a schematic diagram of the sampling airflow of this utility model;

[0024] Figure 5 This is a schematic diagram of the mounting base structure of this utility model;

[0025] Figure 6 This is a schematic diagram of the structure of the fixing claw part of this utility model;

[0026] Figure 7 This is a schematic diagram of the connection structure between the sampling distribution plate and the outer protective shell of this utility model;

[0027] Figure 8 This is a schematic diagram of the sampler structure of this utility model. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0029] Reference Figures 1 to 7 As shown, one embodiment of the novel airborne bacteria sampling head of this utility model includes a base plate 1, an air extraction hole 2 in the middle of the base plate, a fan 3 below the air extraction hole, a mounting base 4 above the air extraction hole, a petri dish 5 placed on the mounting base, at least three movable fixing claws 6 around the mounting base, the at least three movable fixing claws cooperate to fix the petri dish, a sampling distribution plate 7 above the petri dish, the sampling distribution plate is connected to an outer protective shell 8, the outer protective shell covers the periphery of the mounting base and is sealed to the base plate to form a sampling space 9, and the air extraction hole is connected to the sampling space.

[0030] In use, first move the movable fixing claws away from each other to provide a space larger than the diameter of the culture dish. Then place the culture dish into the multiple fixing claws. Next, move the fixing claws towards the center. After the multiple fixing claws come into contact with the culture dish, they interact and cooperate to limit and fix the culture dish so that it does not shake.

[0031] Specifically, refer to Figure 5and Figure 6 As shown, at least three pads 10 are evenly arranged along the circumference of the bottom of the mounting base. The fixing claws are connected to the ends of the pads via adjusting screws 11. A spring 12 is also provided on the surface of the adjusting screw between the fixing claws and the ends of the pads. The pads allow for a spatial gap between the mounting base and the base plate when they are fixedly connected, preventing the mounting base from blocking the vent hole and forming a flow channel. The thickness of the pads meets the requirements of the threaded connection of the adjusting screw. By rotating the adjusting screw, the fixing claws are pushed towards the center of the mounting base or the restriction on the fixing claws is released, allowing the fixing claws to move away from the center of the mounting base. This facilitates fixing or loosening the culture dish.

[0032] During the installation of the petri dish, if the retaining claws are positioned close to the center of the mounting base, it will interfere with the placement of the petri dish. Therefore, a spring design is used. When the adjusting screw is loosened, the spring's stored force is released, causing it to press against the head of the adjusting screw, thus achieving automatic movement. Once the petri dish is in place, operating the adjusting screw corresponding to each retaining claw applies an axial force to the retaining claw, causing it to move towards the petri dish while simultaneously compressing the spring.

[0033] The fixing claw can be directly sleeved on the screw of the adjusting screw. This method causes the fixing claw to rotate along the outer circumference of the screw. Therefore, a guide groove 13 is provided on the mounting base corresponding to the fixing claw. The fixing claw is set in the groove and can move along the guide direction of the guide groove. The guide groove restricts the rotation of the fixing claw. The fixing claw can only move along the axial direction of the screw. When the adjusting screw is rotated, the adjusting screw will not drive the fixing claw to rotate.

[0034] After the petri dish is installed in place, the outer protective shell is fixed to the base plate, covering the petri dish. At this point, a space is formed between the outer protective shell and the base plate; this space is the sampling space, and the petri dish is placed within it. Then, the fan is started, as per [reference needed]. Figure 4 As shown, the fan operates, drawing air out of the sampling space through the air extraction port. Since the air in the sampling space is drawn out, external air enters the sampling space through the sampling distribution plate. Specifically, an air inlet 20 is provided in the middle of the outer protective shell. External air enters through the air inlet and is evenly dispersed into the sampling space through the sampling distribution plate. The sampling distribution plate is located above the petri dish, and the air extraction port is located below the mounting base. External air evenly impacts the agar surface in the petri dish to achieve the sampling purpose. Subsequently, the air flows from inside the petri dish to the outside towards the air extraction port below the mounting base and is discharged.

[0035] A recessed connecting ring 21 is provided below the air inlet. The sampling distribution plate is fixed to the bottom of the recessed connecting ring. The bottom of the recessed connecting ring extends into the interior of the culture dish. A flow gap is provided between the outer periphery of the recessed connecting ring and the inner wall of the culture dish to ensure that the external air can always impact the culture dish and prevent it from flowing directly away from the side.

[0036] Once the sampling time is up, the outer protective shell can be removed, then the adjusting screw can be loosened to secure the culture dish, and the culture dish can be removed to complete the sampling.

[0037] Reference Figure 7 As shown, the sampling distribution plate is locked to the recessed connecting ring. The sampling distribution plate can be replaced to adjust the sampling flow rate. When the sampling flow rate increases, the sampling time can be greatly shortened. By adjusting the time, the purpose of rapid sampling can be achieved.

[0038] The number of airborne bacterial colonies per unit volume of air is expressed as a count concentration, with units of cells / m³. 3 The sampling rate is either per colony / L, and one sampling cycle is 60 seconds. Therefore, when using an airborne bacterial sampler to collect the number of colonies per unit volume of air, it is preferable to choose a sampler with a lower airflow velocity (range 0.3-0.5 m / s) and a larger sampling flow rate (range 28.3-200 L / min) to ensure that the moisture on the surface of the culture medium is not dried out after collection. When collecting samples from Class 10,000 and Class 100 environments, the minimum sampling volume is required to be 500 L / s and 1000 L / s respectively. In this case, the flow rate of the sampler will be required. The higher the flow rate, the shorter the collection time, the less moisture is consumed on the surface of the culture medium, and the higher the colony activity rate.

[0039] Therefore, the colony count for each petri dish was determined using a counting method. The average concentration of airborne bacteria at each measurement point was: average airborne bacteria concentration (cFU / m³). 3 = Colony count / Sample size

[0040] For example: at a certain sampling point, the sampling volume is 400L, the colony count is 1, and the average concentration of airborne bacteria is 1 / 0.4 = 2.5 cells / m³. 3 .

[0041] For example: the sampling volume at a certain measuring point is 2m 3 Colony count 3, average airborne bacteria concentration = 3 / 2 = 1.5 cells / m³ 3 .

[0042] Based on the above calculations, the sampling distribution plate can be perforated evenly.

[0043] The outer protective shell and the base plate are connected by threads for easy disassembly. The base plate also needs to accommodate the sampling head installation. To ensure the sampling head can be adapted to different sized devices, the base plate is designed with a lower base 14 and an upper base 15. The lower base has a stepped groove 16 on its surface and an annular stepped portion 17 on its outer bottom. The upper base is positioned within the stepped groove and fixed to the lower base with locking screws. A connecting ring 18 is provided on the surface of the upper base, with its outer surface threaded to the inner wall of the outer protective shell. The lower base can be designed according to the shape and size of the sampling head installation location, while the upper base only needs to be manufactured to a uniform size. This allows the sampling head to be quickly assembled for different installation environments, reducing design and replacement costs and improving versatility. A sealing gasket 19 is also provided on the surface of the upper base corresponding to the bottom of the outer protective shell. After the outer protective shell is screwed in, it ensures the sealing of the sampling space and prevents air leakage. A second sealing ring is provided between the lower and upper bases to ensure an effective connection and prevent air leakage.

[0044] A dust cover 22 is also provided on the air inlet to prevent contamination when not in use.

[0045] The aforementioned fan is fixed to the inner bottom surface of the concave bracket 23. The concave bracket is locked to the bottom of the base plate. The fan's air inlet 24 extends into the exhaust hole and is sealed by the first sealing ring. A positioning ring 25 is provided on the fan surface around the air inlet, and the positioning ring abuts against the bottom of the base plate. When the concave bracket is locked to the base plate, it will drive the fan to move towards the base plate. The fan's air inlet extends into the exhaust hole, and the first sealing ring effectively seals against air leakage. At the same time, after the positioning ring abuts against the bottom of the base plate, it forms an effective limit with the concave bracket, preventing shaking or other problems during the operation of the fan.

[0046] Reference Figure 8 As shown, this application also discloses a sampler, including the sampling head 111 described above. The sampler also includes a sampling box 26, with the sampling head disposed on the top of the sampling box. The surface of the sampling box is provided with a control unit 27, a box door 28, and a lifting handle 29.

[0047] To use, first open the chamber door, then operate the control unit to operate the fan and start the sampling head for data collection. The control unit includes a touch screen, power switch, and other components for ease of use. After collection, close the chamber door and remove the culture dish. The lifting handle makes it easy to move the entire sampler.

[0048] The above embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model are all within the protection scope of the present utility model.

Claims

1. A novel airborne bacteria sampling head, characterized in that, The device includes a base plate with an air extraction hole in the center. A fan is located below the air extraction hole, and a mounting base is located above the air extraction hole. The mounting base is used to place a culture dish. At least three movable fixing claws are provided around the mounting base to fix the culture dish. A sampling distribution plate is provided above the culture dish and is connected to an outer protective shell. The outer protective shell covers the periphery of the mounting base and is sealed to the base plate to form a sampling space. The air extraction hole is connected to the sampling space. The fan draws air out of the sampling space through the air extraction hole, and the sampling distribution plate is used to evenly diffuse the external air to the petri dish.

2. The novel airborne bacteria sampling head as described in claim 1, characterized in that, At least three pads are evenly arranged along the circumference at the bottom of the mounting base. The fixing claw is connected to the end of the pad by an adjusting screw. A spring is also provided on the surface of the adjusting screw between the fixing claw and the end of the pad.

3. The novel airborne bacteria sampling head as described in claim 2, characterized in that, The mounting base corresponding to the fixed claw is provided with a guide groove, and the fixed claw is disposed in the groove and can move along the guide direction of the guide groove.

4. The novel airborne bacteria sampling head as described in claim 1, characterized in that, The base plate includes a lower base and an upper base. The surface of the lower base is provided with a stepped groove, and the bottom of the outer periphery of the lower base is provided with an annular stepped portion. The upper base is disposed in the stepped groove and is fixedly connected to the lower base by locking screws. The surface of the upper base is provided with a connecting ring, and the outer surface of the connecting ring is threadedly connected to the inner wall of the outer protective shell. The surface of the upper base corresponding to the bottom of the outer protective shell is also provided with a sealing gasket.

5. The novel airborne bacteria sampling head as described in claim 1, characterized in that, An air inlet is provided in the middle of the outer protective shell, and a recessed connecting ring is provided below the air inlet. The sampling distribution plate is fixed to the bottom of the recessed connecting ring, and a dust cover is provided on the air inlet. The bottom of the recessed connecting ring extends into the interior of the culture dish, and a flow gap is provided between the outer periphery of the recessed connecting ring and the inner wall of the culture dish.

6. The novel airborne bacteria sampling head as described in claim 1, characterized in that, The fan is fixed on the inner bottom surface of the concave bracket, the concave bracket is locked to the bottom of the base plate, the air inlet of the fan extends into the air extraction hole and is sealed by the first sealing ring, and a positioning ring is provided on the fan surface around the air inlet, the positioning ring abutting against the bottom of the base plate.

7. The novel airborne bacteria sampling head as described in claim 4, characterized in that, A second sealing ring is provided between the lower base and the upper base.

8. A sampler, characterized in that, Includes the sampling head as described in any one of claims 1-7.

9. The sampler as claimed in claim 8, characterized in that, It includes a sampling box, with the sampling head located on the top of the sampling box, and the surface of the sampling box is provided with a control unit, a box door, and a lifting handle.

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