Manual waste gas sampling mechanism

Abstract

A manual waste gas sampling mechanism comprises a sampling pipe, a sampling bag, a piston, a drawing rod, one-way valve equipment and fixing equipment, a cooling pipe is installed on the lower outer side of the sampling pipe, a liquid adding pipe and a sealing cover are installed at the side end of the cooling pipe, and cooling water is contained in the cooling pipe; the one-way valve equipment is installed at the lower inner end of the sampling pipe, the connecting pipe and the placing bin are installed on the outer side of the sampling pipe, the fixing equipment is installed on one side in the placing bin, the number of the sampling bags is multiple, and one sampling bag is placed in the placing bin; the piston is mounted at the lower end of the pull rod; a supporting plate with a shaft hole is mounted at the upper end of the sampling tube; the drawing rod is positioned in the shaft hole. The waste gas sampling device is relatively simple and compact in structure, convenient to use and low in cost, waste gas can enter the sampling bag at high flow speed and flow under the action of one-way valve equipment and the like, the sampling speed is correspondingly increased, the valve is arranged at the upper end of the sampling bag and can be closed after part of the waste gas enters the sampling bag, and the sampling efficiency is improved. Therefore, the probability that air is mixed into the sampling bag is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sampling equipment, in particular to a manual exhaust gas sampling mechanism. Background Art

[0002] Environmental protection departments and manufacturers use sampling equipment to detect the various gas levels in exhaust gas emitted from relevant areas. Exhaust gas sampling equipment generally includes manual and electric sampling devices. Electric sampling equipment consists of a sampling pump, a matching sampling tube, and a sampling bag. The sampling tube is located at the front end of the sampling pump's volute inlet pipe. The sampling bag's inlet pipe and the volute exhaust pipe are connected by a flexible hose. During sampling, the sampling pump is powered, and the impeller in its volute generates negative pressure, drawing gas from the sampling area into the sampling area and then into the sampling bag through the exhaust pipe. After sampling, the sampler closes the valve of the sampling bag and removes the bag. Manual sampling equipment generally consists of a sampling tube and a sampling bag. The inlet pipe of the sampling bag is connected to the rear of the sampling tube by a flexible hose. During sampling, exhaust gas flows into the sampling tube and then into the sampling bag. After sampling, the sampler closes the valve of the sampling bag and removes the bag. The sampled gas is then subjected to physical and chemical analysis by appropriate testing equipment in the testing room to obtain data on the various gases present in the sampled exhaust gas.

[0003] Due to structural and functional limitations, the two aforementioned sampling devices also have the following technical disadvantages. Specifically, although manual sampling devices have a simple structure, are relatively easy to use, and are low-cost, they require the exhaust gas to actively enter the sampling bag through the sampling tube. In reality, the exhaust gas flow rate is usually not fast and the pressure is not high. As a result, the exhaust gas does not easily fill the sampling bag, which not only prolongs the sampling time, but also easily mixes with ambient air in the sampling bag, adversely affecting the subsequent exhaust gas data detection and analysis. Electric sampling devices can actively draw the exhaust gas from the sampling area into the sampling bag, increasing the sampling speed and minimizing the chance of ambient air entering the sampling bag. However, due to the heavy weight of the sampling pump, the device is inconvenient to carry and use, and the cost is high. In addition, since electric sampling devices require a power supply to operate, if it is inconvenient to connect to the power supply on site, the device will be unable to perform sampling (carrying a battery will make it even more inconvenient to carry and use). Taking all of the above factors into consideration, it is very necessary to provide a sampling mechanism that combines the advantages of manual and electric sampling devices. Utility Model Content

[0004] In order to overcome the drawbacks of existing manual and electric sampling pump equipment due to structural limitations as described in the background technology, the present invention provides a new type of manual exhaust gas sampling mechanism which has a relatively simple and compact structure, is easy to use and low cost. During application, the sampling personnel aligns the front end of the sampling tube with the sampling area, and then pulls the piston to generate negative pressure, which allows the exhaust gas in the sampling area to enter the sampling bag at a higher flow rate and flow, thereby correspondingly improving the sampling speed and reducing the chance of ambient air mixing into the sampling bag.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A manual exhaust gas sampling mechanism includes a sampling tube, a sampling bag, a piston, a pull-out rod, a one-way valve device, and a fixing device, characterized in that a cooling tube is installed on the lower outer side of the sampling tube, a liquid adding tube is installed on the side end of the cooling tube, a sealing cover is installed on the side end of the liquid adding tube, and cooling water is contained in the cooling tube; the one-way valve device is installed on the lower inner end of the sampling tube, a connecting tube and a placement bin are installed at the upper end of the cooling tube and on the outer side of the sampling tube, the fixing device is installed on one side of the placement bin, the lower end of the placement bin has an opening, there are multiple sampling bags, one of which is placed in the placement bin; the piston is installed at the lower end of the pull-out rod; the upper end of the sampling tube is installed with a support plate with an axial hole, and the pull-out rod is located in the axial hole.

[0007] Furthermore, the outer diameter of the piston is larger than the inner diameter of the sampling tube.

[0008] Furthermore, the one-way valve device includes a sealing plate, a spring, and a limit ring. The two limit rings are respectively installed at the lower part of the sampling tube at an upper and lower interval. One side of the sealing plate is rotatably installed on one side of the lower limit ring. The upper and lower ends of the spring are respectively mounted on the upper end of the sealing plate and the lower part of the upper limit ring.

[0009] Furthermore, the outer diameter of the spring is smaller than the inner diameter of the sampling tube and larger than the inner diameter of the limiting ring, and a sealing ring is installed at the lower end of the sealing plate.

[0010] Furthermore, the sampling bag is provided with valves at the upper and lower ends respectively, an air inlet pipe is provided below the lower valve, and the air inlet pipe and the upper end of the connecting pipe are connected via a hose.

[0011] Furthermore, the fixing device includes a fixing plate, a spring, and a pull rod. One end of the pull rod and one end of the fixing plate are installed together. There is an opening at the side end of the placing bin. The fixing plate is located inside the placing bin and the pull rod is located in the opening. The spring is sleeved on the outside of the pull rod between the inside of the placing bin and the fixing plate. The pull rod is located on the outside of the placing bin and is equipped with a handle.

[0012] Furthermore, the outer dimensions of the fixing plate are smaller than the inner dimensions of the placement bin. After the spring is compressed, there is a distance between the fixing plate and one side of the sampling bag. After the spring is released, the fixing plate and one side of the sampling bag are in contact.

[0013] Compared with the prior art, the present invention has the following advantages: (1) Since the present invention does not have an electric sampling pump and does not require an external power supply or battery, it has a relatively simple and compact structure, is easy to use, and has a low cost; (2) During application, the sampling personnel align the front end of the sampling tube with the sampling area, and then manually pull the piston back and forth to generate negative pressure. Under the action of the one-way valve device, the exhaust gas in the sampling area can enter the sampling bag at a higher flow rate and flow rate, thereby correspondingly improving the sampling speed. Since the sampling bag has a valve at the top, it can be closed after some exhaust gas enters the sampling bag, thereby reducing the chance of ambient air mixing into the sampling bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 It is a schematic diagram of the overall structure and local enlarged structure of the utility model.

[0016] Figure 2 It is a partial structural diagram of the utility model. DETAILED DESCRIPTION

[0017] Figure 1 、 2 As shown in the figure, a manual exhaust gas sampling mechanism includes a sampling tube 1, a sampling bag 2, a piston 3, a pulling rod 4, a one-way valve device, and a fixing device. The upper and lower ends of the sampling tube 1 are open structures. A hollow annular cooling tube 101 is welded to the outer lower end of the sampling tube 1, and a liquid adding tube 102 communicating with the interior thereof is welded to the upper left end of the cooling tube. A sealing cap 103 is threadedly installed on the left end of the liquid adding tube; the one-way valve device is installed at the lower inner end of the sampling tube 1, and an "L"-shaped connecting pipe 104 communicating with the interior thereof is welded laterally at the upper end position of the one-way valve device and the left outer side of the sampling tube. A storage bin 105 with an open upper end is welded to the outer side of the sampling tube at the upper end of the connecting pipe 104. The fixing device is installed on the left side of the storage bin 105. There is an opening 1051 in the middle of the lower end of the storage bin 105, and there are multiple sampling bags 2, one of which is placed in the storage bin 105; there is an opening in the middle of the piston 3, and the lower end of the pulling rod 4 has a thread, and the upper part of the thread of the pulling rod 4 is welded with an upper limit plate 41 with an outer diameter smaller than the inner diameter of the sampling tube and larger than the inner diameter of the piston opening. The pulling rod is located at the lower part of the piston and is sleeved with a lower limit plate 42 with an outer diameter smaller than the inner diameter of the sampling tube and larger than the inner diameter of the piston opening. The piston 3 is located between the upper limit plate 41 and the lower limit plate 42, and a fixing nut 43 is threadedly installed on the pulling rod at the lower end of the lower limit plate 42; the upper end of the sampling tube is welded with a hollow support plate 106 with an axial hole, and the middle part of the pulling rod 4 (with a handle welded on the upper part) is located in the axial hole 106.

[0018] Figure 1 、 2 As shown in the figure, the outer diameter of piston 3 (made of heat-resistant sealing material) is slightly larger than the inner diameter of sampling tube 1. Cooling water is supplied to cooling tube 101 via a liquid filling pipe (to cool the exhaust gas entering the sampling tube). The one-way valve device includes a sealing plate 51, a spring 52, and a hollow annular retaining ring 53. The two retaining rings 53 are welded to the lower portion of sampling tube 1 below the connecting pipe, spaced a certain distance apart. The left side of sealing plate 51 is pivotally mounted to the center of the left side of lower retaining ring 53. The upper and lower ends of spring 52 (with an elastic force that just ensures contact between the sealing plate and the upper side of the lower retaining ring) are respectively fitted over the upper end of sealing plate 51 and the lower portion of upper retaining ring 53. The outer diameter of spring 52 is smaller than the inner diameter of sampling tube 1 and larger than the inner diameter of retaining ring 53. A hollow annular heat-resistant rubber ring 511 (which seals the upper end of the lower retaining ring) is bonded to the lower end of sealing plate 51 with heat-resistant adhesive. The sampling bag 2 is made of flexible transparent plastic. A trachea communicating with the interior of the sampling bag is installed in the middle of the upper and lower ends respectively. The outer ends of the two trachea are respectively connected to one end of a manual valve 21 via threads. An air inlet pipe 22 is threadedly installed on the lower part of the lower valve 21. The lower valve 21 and the air inlet pipe 22 are downwardly located at the lower outer end of the placement bin through the opening 1051 at the lower end of the placement bin. The air inlet pipe 22 and the upper end of the connecting pipe 104 are connected via a hose 7 (the lower end of the hose 7 and the upper end of the connecting pipe 104 are bundled together), and the upper valve 21 is located outside the upper end of the placement bin 105. The fixing device includes a fixing plate 61, a spring 62, and a pull rod 63. The right end of the pull rod 63 is welded to the middle of the left end of the fixing plate 61. There is an opening in the middle of the left end of the storage bin 105. The fixing plate 61 is located inside the storage bin 105, and the pull rod 63 is located in the opening. The spring 62 is mounted on the outside of the pull rod between the left side of the storage bin 105 and the left side of the fixing plate 61. The pull rod 63 is welded to the outside of the storage bin and has a handle 64 with an outer diameter larger than the inner diameter of the opening. The outer dimensions of the fixing plate 61 are smaller than the inner dimensions of the storage bin 105. When the spring 62 is compressed to the left, a certain distance is separated between the fixing plate 61 and the left side of the sampling bag 2. When the spring 62 is released, the fixing plate 61 and the left side of the sampling bag 2 contact the sampling bag, thereby fixing the sampling bag.

[0019] Figure 1 、 2As shown, the present invention does not have an electric sampling pump and does not require an external power supply or battery, so the structure is relatively simple and compact, easy to use, and low in cost. Before sampling, the sampling personnel pulls the handle 64 to the left outer end, then vertically places the sampling bag 2 in the storage compartment 105, and seals the lower side of the air inlet pipe 22 of the lower end valve 21 with the upper end of the hose 7. After releasing the handle 64, the fixing plate 61 contacts the left side of the sampling bag 2 under the elastic force of the spring 62, thereby limiting and fixing the sampling bag. When sampling, the sampling personnel aligns the front end of the sampling tube 1 parallel to the sampling area with their left hand, and then pulls the piston 3 back and forth with their right hand to generate negative pressure. Under the action of the one-way valve equipment, the exhaust gas in the sampling area can enter the sampling bag 2 at a higher flow rate and flow, thereby increasing the sampling speed accordingly. Specifically, when the sampling personnel pulls the pulling rod 4 backward, the piston 3 moves backward to generate negative pressure. Under the action of the negative pressure, the exhaust gas in the relevant area pushes the sealing plate to overcome the elastic force of the spring 52, causing the sealing plate 51 to move backward, so that the exhaust gas will enter the upper end of the sampling tube, and the sampling personnel pushes forward. When the rod 4 is pulled out, the piston 3 moves backward to generate pressure, and the negative pressure in the sampling tube disappears. The elastic force of the spring 52 pushes the sealing plate forward, and the sealing plate 51 and the upper part of the lower limit ring are sealed. In this way, the exhaust gas entering the upper end of the one-way valve mechanism and the upper part of the sampling tube will enter the valve 21 opened by the connecting pipe 104 and the valve core at the lower end of the sampling bag and enter the sampling bag 2; the above process is continuously cycled, and after a period of time (generally less than 1 minute), the exhaust gas in the relevant area can fill the sampling bag 2 (when the sampling bag is full of gas, it can push the fixed plate 61 to overcome the elastic force of the spring 62 and move to the left). In the present invention, when sampling, the valve core of the valve 21 at the upper end of the sampling bag can be opened for a period of time to allow the waste gas that enters the sampling bag for the first time to discharge the residual air in the sampling bag (reducing the probability of ambient air mixing into the sampling bag), and then close the upper valve 21; after the sampling is completed, close the lower valve 21, and then the sampling personnel pull the handle 64 to the left outer end, and increase the distance between the right end of the fixed plate and the left end of the sampling bag, and then the sampling bag after sampling can be taken out, completing the entire sampling operation.

[0020] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that come within the meaning and range of equivalents of the claims be included in the present invention.

[0021] In addition, it should be understood that although this specification is described in terms of implementation methods, the implementation methods do not only include an independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A manual exhaust gas sampling mechanism, comprising a sampling tube, a sampling bag, a piston, a pull rod, a one-way valve device, and a fixing device, characterized in that: A cooling pipe is installed on the lower outer side of the sampling tube, a liquid adding pipe is installed on the side end of the cooling pipe, a sealing cover is installed on the side end of the liquid adding pipe, and cooling water is contained in the cooling pipe; the one-way valve device is installed on the lower inner end of the sampling tube, and a connecting pipe and a placement bin are installed at the upper end of the cooling pipe and on the outside of the sampling tube, respectively; the fixing device is installed on one side of the placement bin, and the lower end of the placement bin has an opening, and there are multiple sampling bags, one of which is placed in the placement bin; the piston is installed at the lower end of the pull rod; the upper end of the sampling tube is installed with a support plate with an axial hole, and the pull rod is located in the axial hole.

2. A manual exhaust gas sampling mechanism according to claim 1, characterized in that: The outer diameter of the piston is larger than the inner diameter of the sampling tube.

3. A manual exhaust gas sampling mechanism according to claim 1, characterized in that: The one-way valve device includes a sealing plate, a spring, and a limit ring. The two limit rings are installed on the lower part of the sampling tube at an upper and lower distance from each other. One side of the sealing plate is rotatably installed on one side of the lower limit ring. The upper and lower ends of the spring are respectively mounted on the upper end of the sealing plate and the lower part of the upper limit ring.

4. A manual exhaust gas sampling mechanism according to claim 3, characterized in that: The outer diameter of the spring is smaller than the inner diameter of the sampling tube and larger than the inner diameter of the limiting ring, and a sealing ring is installed at the lower end of the sealing plate.

5. A manual exhaust gas sampling mechanism according to claim 1, characterized in that: The sampling bag is respectively provided with valves at the upper and lower ends. An air inlet pipe is provided below the lower valve. The air inlet pipe and the upper end of the connecting pipe are connected via a hose.

6. A manual exhaust gas sampling mechanism according to claim 1, characterized in that: The fixing device includes a fixing plate, a spring, and a pull rod. One end of the pull rod and one end of the fixing plate are installed together. There is an opening at the side end of the placing bin. The fixing plate is located inside the placing bin and the pull rod is located in the opening. The spring is sleeved on the outside of the pull rod between the inside of the placing bin and the fixing plate. The pull rod is located on the outside of the placing bin and is equipped with a handle.

7. A manual exhaust gas sampling mechanism according to claim 6, characterized in that: The outer dimension of the fixing plate is smaller than the inner dimension of the placement chamber. After the spring is compressed, there is a distance between the fixing plate and one side of the sampling bag. After the spring is released, the fixing plate and one side of the sampling bag are in contact.

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