CN100334436C - Single pipe sediment sampler without boundary turbulence - Google Patents

Abstract

A single-pipe sediment sampler without boundary disturbance, its structure includes a sampling pipe and its supporting device, and a valve device is arranged on the upper mouth of the sampling pipe, and the valve device is a pipe that can be opened or closed under the action of hydrodynamic force. The ball valve device at the mouth of the valve is composed of a valve sleeve and a ball valve in the valve sleeve. A sealing ring matching the ball valve is installed on the upper nozzle of the sampling pipe in the valve sleeve. The ball valve is movably placed on the top of the sealing ring. A closed valve is formed to the upper nozzle of the sampling tube. In the present invention, through the sealing cooperation between the ball valve installed in the ball valve device at the upper mouth of the sampling tube and the sealing ring on the nozzle of the sampling tube, the sampler can close the upper nozzle of the sampling tube when it is pulled up after sampling, forming The vacuum state in the sampling tube can keep the sample in the tube without disturbance and keep the sequence in its original state.

Description

A Single Tube Sediment Sampler Without Boundary Disturbance

technical field

The invention relates to a sampling tube device for sampling underwater sediments.

Background technique

The tubular sediment (underwater) sampler is a scientific research instrument widely used in environmental, ecological and biological research. Most of the tubular samplers currently designed produce boundary disturbances during sampling, sample disturbances and layer sequence Destroyed, the upper layer of water cannot be collected. CN2591609 discloses a marine sediment pressure-holding sampling device without boundary disturbance. This device adopts a rather complicated mechanical structure to make the sampling tube form a closed non-disturbance state after sampling. The reason of its structure is easy to cause the failure of mechanical action and lead to the failure of sampling work.

Contents of the invention

The purpose of the present invention is to propose a single-tube sediment sampler without disturbance of the underwater sediment interface collected, simple in structure, reliable in action, and low in cost, so as to overcome the above-mentioned existing single-tube sampler. The problem.

The purpose of the present invention is achieved by setting a valve device on the upper mouth of the sampling tube. The specific structure of the sampler includes a sampling tube and its support device. The lower mouth of the sampling tube is equipped with a sampling head. The device includes a main support plate, a fixed frame, a weight and a balance ring. The sampling tube is supported and fixed by the main support plate. The fixed frame is installed on the main support plate, and a weight is installed on it to adjust the sinking force of the sampler. , so as to adjust the amount of sediment collected by the sampling tube, the balance ring is set on the collecting tube, and hoisted on the fixed frame by a pull rope to keep the sampler in a vertical state when it sinks to sample; The valve device at the upper mouth of the valve is a ball valve device that can open or close the nozzle under the action of hydrodynamic force. Its structure is composed of a valve sleeve and a ball valve in the valve sleeve. There is a sealing ring matched with the ball valve, and the ball valve is movably placed on the upper part of the sealing ring to form a closed valve for the upper nozzle of the sampling tube.

In the present invention, the ball valve in the ball valve device at the upper mouth of the sampling tube can sink to the upper part of the sealing ring by its own weight, and cooperate with the sealing ring to close the upper nozzle of the sampling tube. When the sampling tube sinks, the hydrodynamic force will lift the ball valve at the nozzle upwards and break away from the sealing ring, that is, the valve at the nozzle is opened, and the water in the sampling tube can enter the valve sleeve from the nozzle upwards and then flow out from the upper part of the valve sleeve. The drainage holes on the surrounding wall of the nozzle and the valve sleeve escape outwards, and setting the drainage holes on the surrounding wall of the valve sleeve can accelerate the escape of water; when the sampler reaches the bottom of the water body, it can reliably collect sediment and floating water under natural gravity; When the sampler is at rest, the ball valve in the ball valve device sinks to the upper part of the sealing ring by its own weight; when the sampler is pulled up, under the double action of hydrodynamic force and ball valve gravity, the ball valve and the sealing ring are closely attached, that is, automatic Close the nozzle valve, and as the sampling pipe is pulled up, the columnar sediment in the sampling pipe is naturally disconnected from the bottom sediment, and the sampling pipe is finally separated from the water body to complete the sampling action. Since the upper nozzle is closed, the inside of the sampling pipe A vacuum is formed, so that the sample in the tube can be kept undisturbed and the sequence remains in its original state.

The technical key of the present invention as a single-pipe sediment sampler without boundary disturbance is the sealing cooperation between the ball valve installed in the ball valve device on the upper mouth of the sampling pipe and the sealing ring on the mouth of the sampling pipe, so that the sampler When pulling up after sampling, it forms a seal on the upper nozzle of the sampling tube, forming a vacuum state in the sampling tube. Said ball valve is a sphere with a specific gravity greater than water or seawater, made of materials with a specific gravity greater than water or seawater, such as stone, stainless steel, etc., or filled with a material with a specific gravity greater than water or seawater, such as lead or mercury, in the plastic ball shell. And other metal materials etc. constitute the ball of the ball valve.

The single-tube sediment sampler provided by the present invention can achieve the technical effect that the collected sediment interface is not disturbed, and the collected sediment and upper layer water can keep the sequence of the sample from being damaged, and is suitable for the environment, ecology, etc. It meets the needs of research, and has the advantages of simple structure and low cost.

Description of drawings

The accompanying drawing is a schematic structural view of an embodiment of the present invention.

Detailed ways

As shown in the drawings, in the structure of the single-tube sediment sampler, 3 is a sampling tube, and the lower mouth of the sampling tube is equipped with a sampling head 1. The sampling tube is supported by the main support plate 6, and on the support plate 6 A fixed frame 12 is installed to fix all parts of the sampler as a whole; weights 5 are set on both sides of the fixed frame in a balanced and symmetrical manner, so that the sampler has the required sinking weight, and the number of heavy hammers can be increased or decreased on the fixed frame (weight), used to adjust the amount of sediment collected; 2 is a balance ring that is sleeved on the sampling tube, and the balance ring is hoisted on the fixed frame 12 by a stainless steel rope 4, so that the sampler maintains a vertical state when sinking to sample A valve device is installed on the upper mouth of the sampling pipe, and the valve device is made of a spherical ball valve 9 and a valve sleeve 10, and the valve sleeve 10 is installed and fixed on the peripheral wall of the upper mouth of the sampling pipe by the valve core 7, and the valve sleeve A sealing ring 8 cooperating with the ball valve 9 is installed in the upper nozzle of the sampling tube, and the ball valve 9 is placed on the upper part of the sealing ring 8 to form a closed valve to the upper nozzle of the sampling tube. The upper part of the valve sleeve 10 is the water outlet , and is provided with drainage hole 11 on its peripheral wall.

The relevant parameters of this sampler are as follows: the inner diameter of sampling pipe 3 is 4cm, the inner diameter of valve sleeve 10 is 5cm, the outer diameter of sealing ring 8 is 5cm, and inner diameter is 4.1cm, and the spheroid diameter of ball valve 9 is 4.5cm.

Claims (3)

1. A single-tube sediment sampler without boundary disturbance, comprising a sampling tube (3) and its supporting device, the lower mouth of the sampling tube is equipped with a sampling head (1), characterized in that said sampling tube (3) ) is equipped with a valve device that can open or close the nozzle under the action of hydrodynamic force. The valve device is composed of a valve sleeve (10) and a ball valve (9) in the valve sleeve. A sealing ring (8) matched with the ball valve (9) is installed on the upper nozzle of the sampling pipe (3), and the ball valve (9) is movably placed on the upper part of the sealing ring (8) to form a seal for the sampling pipe (3). The closed valve of the upper nozzle; said supporting device comprises main support plate (6), fixed frame (12), weight (5) and balance ring (2), and its sampling pipe (3) is supported by main support plate (6) ) is supported and fixed, the fixed frame (12) is installed on the main support plate (6), and the weight (5) is installed on the fixed frame (12), the balance ring (2) is set on the collection tube (3), and It is hoisted on the fixed frame (12) by a stay rope. 2. The single-pipe sediment sampler without boundary disturbance according to claim 1, characterized in that said ball valve (9) is a sphere with a specific gravity greater than that of water or seawater. 3. The single-pipe sediment sampler without boundary disturbance according to claim 1, characterized in that the peripheral wall of the valve sleeve (10) is provided with drainage holes (11).

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