Soil gas collection and detection equipment

Abstract

The utility model discloses soil gas collecting and detecting equipment which comprises a collecting cylinder, the bottom end of the collecting cylinder is connected with a soil breaking cone, the top end of the collecting cylinder is connected with one end of a gas conveying pipe, the other end of the gas conveying pipe is connected with a pump suction type gas detector, the soil breaking cone comprises a cone body, a cavity is formed in the cone body, and the pump suction type gas detector is arranged in the cavity. A plurality of air inlet holes which are annularly and uniformly distributed are formed in the outer wall of the periphery of the cone in a penetrating mode, a plug is slidably connected into each air inlet hole, each plug is connected with an adjusting mechanism, and in the process that the soil breaking cone is inserted into soil, the plugs are located in the air inlet holes; the air inlet hole cannot be blocked by external soil in the insertion process, so that the soil gas collection efficiency cannot be influenced, the situation that the collection barrel and the soil breaking cone need to be detached and separated to clean the air inlet hole every time gas collection and detection are completed can be avoided, and the use convenience is relatively improved.

Description

Technical Field

[0001] The utility model relates to the field of soil gas detection, and specifically, to a soil gas collection and detection device. Background Art

[0002] Collecting and analyzing the vadose zone gas in soil is an effective technical means to judge the nearby environmental conditions. Generally, static chamber method or directly collecting the covered soil in the vadose zone is used for soil gas collection. However, both of these two methods will cause the mixing of soil gas and atmosphere during the collection process, which affects the subsequent gas analysis. The existing gas collection device collects gas by the static chamber method and then sucks the gas inside the static chamber into the gas storage cavity through negative pressure. This method still causes the mixing of soil gas and atmosphere and affects the subsequent gas analysis. For this reason, the application number: CN202320265966.2 discloses a soil gas collection tool, including an outer cylinder, an inner cylinder is arranged inside the outer cylinder, the inner cylinder and the outer cylinder are connected to the same top surface at the top, and a gas collection structure is arranged inside the inner cylinder; a conical head, the conical head is hollow and has annularly regularly distributed air inlet holes on the side wall. This tool can realize the in-situ collection of soil gas, without the need to dig out the soil for gas collection, avoiding the mixing of soil gas and atmosphere and affecting the subsequent analysis; at the same time, this tool can also separate the conical head from the outer cylinder, which is convenient for cleaning the inside of the conical head and the air inlet holes after one collection is completed, avoiding affecting the next collection.

[0003] However, the above solution still has certain defects. The inventor has found through research that in the above solution, air inlet holes are opened on the outer wall of the conical head to suck the gas in the soil. However, during the process of inserting the conical head into the soil, the soil may be blocked in the air inlet holes under the extrusion pressure, thereby reducing the gas collection efficiency.

[0004] How to invent a soil gas collection and detection device to improve these problems has become an urgent problem to be solved by those skilled in the art. Summary of the Utility Model

[0005] In order to make up for the above deficiencies, the utility model provides a soil gas collection and detection device, aiming to improve the problem that in the prior art, air inlet holes are opened on the outer wall of the conical head to suck the gas in the soil, but during the process of inserting the conical head into the soil, the soil may be blocked in the air inlet holes under the extrusion pressure, thereby reducing the gas collection efficiency.

[0006] The present utility model is implemented as follows: A soil gas collection and detection device includes a collection cylinder. A soil-breaking cone is connected to the bottom end of the collection cylinder. One end of an air delivery pipe is connected to the top end of the collection cylinder, and the other end of the air delivery pipe is connected to a pump suction type gas detector. The soil-breaking cone includes a cone body. A cavity is arranged inside the cone body. A plurality of air inlet holes which are uniformly distributed in a ring shape are penetrated and arranged on the outer wall of the circumferential circle of the cone body. A plug is slidably connected in each air inlet hole, and each plug is connected to an adjusting mechanism.

[0007] In a preferred technical solution of the present utility model, the collection cylinder includes a cylinder body. A connecting portion is arranged at the bottom end of the cylinder body. An opening corresponding to the connecting portion is arranged at the top of the cone body. Internal threads are arranged on the inner wall of the opening. Thread grooves corresponding to the internal threads are arranged on the outer wall of the connecting portion. The cylinder body and the cone body are threadedly connected. An air outlet pipe is communicated and arranged at the top end of the cylinder body. One end of the air delivery pipe is sleeved on one end of the air outlet pipe.

[0008] In a preferred technical solution of the present utility model, the diameter of each plug is consistent with the inner diameter of the air inlet hole, and a ventilation groove communicated with the inside of the cone body is arranged at the end of the inner wall of one side of each air inlet hole.

[0009] In a preferred technical solution of the present utility model, the adjusting mechanism includes an installation ring. The outer wall of the installation ring is coaxially arranged with the cone body, and the outer wall of the installation ring is fixedly connected with the inner wall of the cone body through a plurality of connecting rods. An adjusting sliding rod is slidably connected in the middle of the installation ring. A connecting head is fixedly connected to the bottom end of the adjusting sliding rod. One end of a connecting rod is rotatably connected to one end of each plug facing the connecting head, and the other end of each connecting rod is rotatably connected to the top surface of the connecting head.

[0010] In a preferred technical solution of the present utility model, a limiting spring is sleeved outside the part of the adjusting sliding rod between the installation ring and the connecting head. Two ends of the limiting spring are respectively fixedly connected to the bottom surface of the installation ring and the upper surface of the connecting head.

[0011] In a preferred technical solution of the present utility model, the top end of the adjusting sliding rod extends to the outside of the cylinder body through a sealing hole arranged on the top surface of the cylinder body.

[0012] In a preferred technical solution of the present utility model, each air inlet hole extends obliquely in the inner wall of the cone body, and the end facing the inside of the cone body is relatively lower.

[0013] The beneficial effects of the present utility model are as follows: A soil gas collection and detection device obtained through the above design in the present utility model, during use, when inserting the soil-breaking cone into the soil, since the plug is located in the air inlet hole, the external soil will not cause blockage of the air inlet hole during the insertion process, which will not affect the soil gas collection efficiency, and it can also avoid cleaning the air inlet hole by disassembling and separating the collection cylinder and the soil-breaking cone every time gas collection and detection are completed, thereby relatively improving the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic three-dimensional view of the overall structure provided by the embodiment of the present utility model;

[0016] Figure 2 It is a schematic three-dimensional view of the separated overall sectional structure of the collection cylinder and the soil-breaking cone provided by the embodiment of the present utility model;

[0017] Figure 3 It is a schematic three-dimensional view of the overall sectional structure of the soil-breaking cone provided by the embodiment of the present utility model;

[0018] Figure 4 It is a schematic three-dimensional view of the overall structure of the adjustable plug assembly cone provided by the embodiment of the present utility model.

[0019] In the figure: 1 - collection cylinder; 2 - soil-breaking cone; 3 - gas transmission pipe; 4 - pump suction type gas detector; 101 - cylinder body; 102 - air outlet pipe; 103 - connection part; 201 - cone; 202 - internal thread; 203 - air inlet hole; 204 - ventilation groove; 205 - plug; 206 - mounting ring; 207 - connecting rod; 208 - adjusting slide rod; 209 - connecting head; 210 - connecting rod; 211 - limiting spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0021] Please refer to Figures 1 to 4 For this, the present utility model provides a technical solution: a soil gas collection and detection device, including a collection cylinder 1, a soil-breaking cone 2 is connected to the bottom end of the collection cylinder 1, one end of an air delivery pipe 3 is connected to the top end of the collection cylinder 1, the other end of the air delivery pipe 3 is connected to a pump suction type gas detector 4. The soil-breaking cone 2 includes a cone body 201, a cavity is arranged inside the cone body 201, a plurality of air inlet holes 203 which are evenly distributed in a ring shape are penetrated and arranged on the outer wall of the circumference of the cone body 201, a plug 205 is slidably connected in each air inlet hole 203, and each plug 205 is connected to an adjusting mechanism.

[0022] Please refer to Figures 3 to 4 For this, the collection cylinder 1 includes a cylinder body 101, a connecting part 103 is arranged at the bottom end of the cylinder body 101, an opening corresponding to the connecting part 103 is arranged at the top of the cone body 201, an internal thread 202 is arranged on the inner wall of the opening, a thread groove corresponding to the internal thread 202 is arranged on the outer wall of the connecting part 103, the cylinder body 101 and the cone body 201 are in threaded connection, an air outlet pipe 102 is communicated and arranged at the top end of the cylinder body 101, and one end of the air delivery pipe 3 is sleeved on one end of the air outlet pipe 102.

[0023] By threading the cylinder body 101 and the cone body 201 through the thread groove arranged on the outer wall of the connecting part 103 and the internal thread 202, it is convenient for the user to clean the inside of the cylinder body 101 and the cone body 201, thereby avoiding the influence of residual gas on the subsequent detection accuracy.

[0024] Furthermore, the diameter of each plug 205 is the same as the inner diameter of the air inlet hole 203, and a ventilation groove 204 communicated with the inside of the cone body 201 is arranged at the end of the inner wall of one side of each air inlet hole 203.

[0025] The same diameter of the plug 205 and the air inlet hole 203 ensures the sealing performance when the whole soil-breaking cone 2 enters the soil, avoiding the infiltration of external air and affecting the detection result. When the cone body 201 enters the corresponding soil depth, all the plugs 205 are driven by the adjusting mechanism to slide towards the inside of the cone body 201, thereby gradually exposing the ventilation groove 204. At this time, the air inlet hole 203, the ventilation groove 204 and the inside of the cone body 201 are communicated, and the gas in the soil can be extracted into the pump suction type gas detector 4.

[0026] Furthermore, the adjusting mechanism includes an installation ring 206, the outer wall of the installation ring 206 is coaxially arranged with the cone body 201 and its outer wall is fixedly connected with the inner wall of the cone body 201 through a plurality of connecting rods 207, an adjusting slide rod 208 is slidably connected in the middle of the installation ring 206, a connecting head 209 is fixedly connected to the bottom end of the adjusting slide rod 208, one end of a connecting rod 210 is rotatably connected to one end of each plug 205 facing the connecting head 209, and the other end of each connecting rod 210 is rotatably connected to the top surface of the connecting head 209.

[0027] When the adjusting slide bar 208 slides downward along the lower end of the cone 201, the connecting head 209 moves downward therewith. At this time, under the pulling of the connecting rod 210, all the plugs 205 slide synchronously toward the inside of the cone 201, gradually connecting the ventilation groove 204 and the air inlet hole 203, so that the gas in the soil can enter the cone 201 conveniently.

[0028] Further, a limiting spring 211 is sleeved outside the part of the adjusting slide bar 208 between the mounting ring 206 and the connecting head 209. The two ends of the limiting spring 211 are fixedly connected to the bottom surface of the mounting ring 206 and the upper surface of the connecting head 209 respectively.

[0029] By arranging the limiting spring 211, the adjusting slide bar 208 can be limited. After the adjusting slide bar 208 is released, the connecting head 209 resets under the action of the limiting spring 211, thereby driving the adjusting slide bar 208 to reset. All the plugs 205 also reset simultaneously to continue sealing the air inlet hole 203, avoiding soil entering the inside of the cone 201 from the air inlet hole 203 when the whole soil-breaking cone 2 is taken out.

[0030] Further, the top end of the adjusting slide bar 208 extends to the outside of the cylinder 101 through a sealing hole opened on the top surface of the cylinder 101.

[0031] Sealing washers are arranged at the positions of the inner wall and the outer wall of the cylinder 101 corresponding to the sealing hole, so as to reduce the situation that external air enters the inside of the cylinder 101 when the adjusting slide bar 208 is pressed outside the cylinder 101.

[0032] Further, each air inlet hole 203 extends obliquely in the inner wall of the cone 201, and the end facing the inside of the cone 201 is relatively lower.

[0033] Setting the air inlet hole 203 at a certain inclination angle upward can prevent the plug 205 from sliding into the inside of the cone 201 under force when the cone 201 enters the soil, resulting in soil entering the cone 201.

[0034] Working principle: Thread the whole earth-breaking cone 2 onto the bottom end of the cylinder body 101. Sleeve both ends of the gas transmission pipe 3 onto the gas outlet pipe 102 and the intake end of the pump-suction type gas detector 4. Insert the earth-breaking cone 2 into the corresponding depth of the soil according to the detection requirements. Press down one end of the adjusting slide bar 208, so that the adjusting slide bar 208 slides downward in the mounting ring 206, driving the connecting head 209 to move downward. While the connecting head 209 moves, all the plugs 205 are driven by the connection of the connecting rod 210 to slide in the air intake holes 203 towards the inside of the cone body 201 until the ventilation grooves 204 are gradually exposed to connect the air intake holes 203 and the inside of the cone body 201. Start the pump-suction type gas detector 4 to extract the gas in the soil into the cone body 201, and then enter the pump-suction type gas detector 4 through the cylinder body 101 and the gas transmission pipe 3 to detect the components of the soil gas. During the process of inserting the earth-breaking cone 2 into the soil, since the plugs 205 are located in the air intake holes 203, the external soil will not block the air intake holes 203 during the insertion process, and thus will not affect the soil gas collection efficiency. During the collection process, the position of the plugs 205 is adjusted to connect the air intake holes 203 and the inside of the cone body 201 to collect the soil gas.

[0035] It should be noted that the specific model and specification of the pump-suction type gas detector 4 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be elaborated in detail.

[0036] The power supply and principle of the pump-suction type gas detector 4 are clear to those skilled in the art, so it will not be elaborated in detail here.

[0037] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A soil gas collection and detection device, characterized in that: It includes a collecting tube, the bottom end of which is connected to a soil-breaking cone, the top of which is connected to one end of a gas pipe, the other end of which is connected to a pump-suction gas detector, the soil-breaking cone includes a cone, a cavity is provided inside the cone, a plurality of air inlet holes evenly distributed in an annular shape are penetrated through the outer wall of the cone, a plug is slidably connected to each of the air inlet holes, and each of the plugs is connected to an adjusting mechanism.

2. The soil gas collection and detection device according to claim 1, characterized in that: The collecting tube includes a cylinder body, a connecting portion is provided at the bottom end of the cylinder body, an opening corresponding to the connecting portion is provided at the top of the cone body, an internal thread is provided on the inner wall of the opening, a thread groove corresponding to the internal thread is provided on the outer wall of the connecting portion, the cylinder body and the cone are threadedly connected, an air outlet pipe is provided at the top end of the cylinder body, and one end of the air supply pipe is sleeved on one end of the air outlet pipe.

3. The soil gas collection and detection device according to claim 1, characterized in that: The diameter of each plug is consistent with the inner diameter of the air inlet hole, and a ventilation groove communicating with the interior of the cone is provided at the inner wall end of one side of each air inlet hole.

4. The soil gas collection and detection device according to claim 1, characterized in that: The adjustment mechanism includes a mounting ring, an outer wall of the mounting ring is coaxially arranged with the cone and the outer wall is fixedly connected to the inner wall of the cone through a plurality of connecting rods, an adjusting slide rod is slidably connected to the middle of the mounting ring, and a connecting head is fixedly connected to the bottom end of the adjusting slide rod, and one end of a connecting rod is rotatably connected to one end of each of the plugs facing the connecting head, and the other end of each of the connecting rods is rotatably connected to the top surface of the connecting head.

5. The soil gas collection and detection device according to claim 4, characterized in that: A limit spring is sleeved on the outer portion of the adjusting slide rod between the mounting ring and the connecting head, and two ends of the limit spring are respectively fixedly connected to the bottom surface of the mounting ring and the upper surface of the connecting head.

6. The soil gas collection and detection device according to claim 4, characterized in that: The top end of the adjusting slide rod extends to the outside of the cylinder through a sealing hole opened on the top surface of the cylinder.

7. The soil gas collection and detection device according to claim 1, characterized in that: Each of the air inlet holes extends obliquely in the inner wall of the cone, and one end facing the inside of the cone is relatively low.

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