A sampling head suitable for multi-point sampling of a sampling device

Abstract

The present invention discloses a sampling head suitable for multi-point sampling of a sampling device, comprising a sampling head body adapted to the sampling device, the sampling head body consisting of a sampling block and a connecting end, the sampling block having a plurality of sampling cavities, each of the plurality of sampling cavities being provided with a sampling tube for sampling, a filter membrane being provided in the middle of the sampling tube, a limiting cover being provided on the air inlet end of the sampling block, a plurality of air inlet holes matching the sampling cavities being provided on the limiting cover, a retaining valve being provided in the air inlet hole, the sampling head of the present invention having a plurality of sampling cavities, when performing multi-point sampling measurement, air is selectively allowed to enter a single sampling cavity by controlling the opening and closing of the retaining valve, thereby making the sampling tube in each sampling cavity relatively independent during operation, and no need to repeatedly take out the sampling tube to replace the filter membrane when performing multi-point sampling, the sampling head is easy to use, and the efficiency of multi-point sampling measurement is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sampling, and in particular to a sampling head suitable for multi-point sampling of a sampling device. Background Art

[0002] A dust sampling device refers to a portable device for collecting dust samples in dusty air. It is widely used in health monitoring and evaluation in departments such as disease prevention, environmental monitoring, scientific research and teaching. It is specifically used to measure the average dust concentration in the air in the workplace of a production team. The sampling head used in the existing dust sampling device has a simple structure. When performing multi-point sampling and measurement, a new filter membrane needs to be replaced after a single-point measurement is completed for the next sampling and measurement. The sampling tube needs to be taken out and put in repeatedly, and the filter membrane needs to be replaced, which brings inconvenience to the operator and affects the sampling and measurement efficiency. Therefore, a sampling head suitable for multi-point sampling is urgently needed. Summary of the invention

[0003] The object of the present invention is to provide a sampling head suitable for multi-point sampling of a sampling device to solve the problems raised in the above background technology.

[0004] To achieve the above object, the technical solution adopted by the present invention is: the sampling head suitable for multi-point sampling of a sampling device comprises a sampling head body adapted to the sampling device, the sampling head body is composed of a sampling block and a connecting end, the sampling block has a plurality of sampling cavities, the plurality of sampling cavities are each provided with a sampling cylinder for sampling, and a filter membrane is provided in the middle of the sampling cylinder;

[0005] The air inlet end of the sampling block is sleeved with a limit cover, the limit cover has a plurality of air inlet holes matching the sampling cavity, the air inlet holes are provided with a retaining valve, and the limit cover also includes a control switch for controlling the start of the retaining valve;

[0006] The connecting end comprises a connecting joint, and the connecting joint is composed of an exhaust head connected to a sampling device and an air inlet head respectively connected to a plurality of sampling cavities.

[0007] The present invention improves on the original sampling head and provides a plurality of sampling chambers to enable the sampling head to have the capability of multi-point sampling. When performing multi-point sampling measurement, the air is selectively allowed to enter a single sampling chamber by controlling the opening and closing of the interception valve, thereby making the sampling cylinder in each sampling chamber relatively independent during operation. When performing multi-point sampling, there is no need to repeatedly take out the sampling cylinder to replace the filter membrane. The invention is easy to use and improves the efficiency of multi-point sampling measurement.

[0008] Preferably, the control switch is connected to the control system of the sampling device via a wireless signal transceiver, so as to control the opening and closing of the interception valve.

[0009] Preferably, a rubber pad is provided between the limit cover and the sampling block, and the rubber pad has a through hole that cooperates with the air inlet and the sampling cavity to improve the air tightness of the sampling cavity.

[0010] Preferably, the sampling tube includes an air intake tube near the air intake end of the sampling chamber and an exhaust tube near the exhaust end of the sampling chamber, the air intake tube and the exhaust tube are threadedly connected, and the filter membrane is arranged between the air intake tube and the exhaust tube to facilitate the replacement of the filter membrane.

[0011] The beneficial effects of the present invention are:

[0012] The sampling head of the present invention has multiple sampling chambers. When performing multi-point sampling measurements, air is selectively allowed to enter a single sampling chamber by controlling the opening and closing of the interception valve, thereby making the sampling cylinder in each sampling chamber relatively independent during operation. When performing multi-point sampling, there is no need to repeatedly take out the sampling cylinder to replace the filter membrane. The method is easy to use and improves the efficiency of multi-point sampling measurements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 is a front view of the sampling block of the present invention;

[0015] Figure 3 It is a structural schematic diagram of the sampling tube of the present invention.

[0016] Explanation of the accompanying drawings: 1. Sampling block, 11. Sampling chamber, 12. Sampling tube, 1201. Air end tube, 1202. Exhaust tube, 13. Limit cover, 14. Air inlet hole, 15. Retention valve, 16. Control switch, 17. Rubber pad, 18. Through hole, 19. Filter membrane, 2. Connection end, 21. Connecting head, 22. Air inlet head. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0018] like Figure 1-2 As shown, the sampling head suitable for multi-point sampling of the sampling device comprises a sampling head body adapted to the sampling device, the sampling head body is composed of a sampling block 1 and a connecting end 2, the sampling block 1 has a plurality of sampling cavities 11, each of the plurality of sampling cavities 11 is provided with a sampling cylinder 12 for sampling, and a filter membrane 10 is provided in the middle of the sampling cylinder 12;

[0019] The air inlet end of the sampling block 1 is sleeved with a limit cover 13, and the limit cover 13 has a plurality of air inlet holes 14 matching the sampling chamber 11, and a retaining valve 15 is provided in the air inlet hole 14. The limit cover 13 also includes a control switch 16 for controlling the start of the retaining valve 15;

[0020] The connecting end 2 comprises a connecting connector 21 , and the connecting connector 21 is composed of an exhaust connector 22 connected to a sampling device and an air inlet connector 22 respectively connected to a plurality of sampling chambers 11 .

[0021] When performing multi-point sampling, first, the intercepting valve 15 is opened and closed by controlling the switch 16, so that the air in the sampling area can enter the sampling tube 12 in one of the sampling chambers 11, and sampling is achieved when the air passes through the filter membrane 10. After the sampling in this area is completed, the intercepting valve 15 is controlled by the switch 16 to close the sampling chamber 11, so that the air cannot enter the sampling tube 12, and mark it to distinguish the sampling tube 12 that has been sampled, and then move the sampling device to the next sampling area, repeat the above operation, and select the sampling tube 12 in another sampling chamber 11 for sampling, repeat the above steps, and then achieve multi-point sampling. Finally, after the sampling is completed, open the limit cover 13 and remove the sampling tube 12 in the sampling chamber 11 for subsequent measurement.

[0022] As a preferred solution of the above embodiment, the control switch 16 for controlling the opening and closing of the interception valve 15 is connected to the control system of the sampling device through a wireless signal transceiver.

[0023] As a preferred solution of the above embodiment, in order to improve the air tightness of the sampling chamber 11, a rubber pad 17 is provided between the limit cover 13 and the sampling block 1, and the rubber pad 17 has a through hole 18 that cooperates with the air inlet hole 14 and the sampling chamber 11. When sampling the sampling area, the intercepting valve 15 will open one of the air inlet holes 14, so that air can enter the sampling tube 12 in the sampling chamber 11 corresponding to the air inlet hole 14. At this time, the rubber pad 17 is provided between the limit cover 13 and the sampling block 1 to prevent air from entering the sampling tube 12 in the sampling chamber 11 corresponding to the closed air inlet hole 14 through the gap between the limit cover 13 and the sampling block 1.

[0024] As a preferred solution of the above embodiment, in order to facilitate the replacement of the filter membrane 10, the sampling cylinder 12 includes an air intake cylinder 1201 close to the air intake end of the sampling chamber 11 and an exhaust cylinder 1202 close to the exhaust end of the sampling chamber 11, the air intake cylinder 1201 and the exhaust cylinder 1202 are threadedly connected, and the filter membrane 10 is arranged between the air intake cylinder 1201 and the exhaust cylinder 1202.

[0025] The above-described embodiments only express specific implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A sampling head suitable for multi-point sampling of a sampling device, comprising a sampling head body adapted to the sampling device, characterized in that: The sampling head body is composed of a sampling block and a connecting end. The sampling block has a plurality of sampling cavities. Each of the plurality of sampling cavities is provided with a sampling tube for sampling. A filter membrane is provided in the middle of the sampling tube. The air inlet end of the sampling block is sleeved with a limit cover, the limit cover has a plurality of air inlet holes matching the sampling cavity, the air inlet holes are provided with a retaining valve, and the limit cover also includes a control switch for controlling the start of the retaining valve; The connecting end comprises a connecting joint, and the connecting joint is composed of an exhaust joint connected to the sampling device and an air intake joint respectively connected to a plurality of sampling chambers; A rubber pad is provided between the limit cover and the sampling block, and the rubber pad has a through hole that cooperates with the air inlet and the sampling cavity; The sampling tube comprises an air intake tube near the air intake end of the sampling cavity and an exhaust tube near the exhaust end of the sampling cavity. The air intake tube and the exhaust tube are threadedly connected, and the filter membrane is arranged between the air intake tube and the exhaust tube.

2. The sampling head suitable for multi-point sampling of a sampling device according to claim 1, characterized in that: The control switch is connected to the control system of the sampling device through the wireless signal transceiver.

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