Negative pressure oil sampler with good air tightness

Abstract

The utility model discloses a negative pressure oil sampler with good air tightness, which relates to the technical field of oil detection, and comprises a sampling box, the side edge of the sampling box is fixed and connected with two groups of sealing connecting pipes in a penetrating manner, and the two groups of sealing connecting pipes are respectively provided with a sampling hose and a drainage hose; a liquid inlet cavity and a liquid discharge cavity are respectively formed in the sampling box, and floating balls are arranged in the liquid inlet cavity and the liquid discharge cavity; when the diaphragm is bulged, the interior of the liquid storage cavity is in a negative pressure environment, then the floating ball moves towards the negative pressure cavity, the sampling hose pumps an oil product (sample) in the oil tank into the liquid inlet cavity and the liquid storage cavity, and when the movable plug moves downwards, the interior of the negative pressure cavity is in an inflated state, so that the diaphragm is bulged towards the liquid storage cavity. The pressure in the liquid storage cavity is increased, and the sample in the liquid storage cavity enters the liquid discharge cavity and then enters the collection pipe through the liquid discharge hose, so that the collection of the sample is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of oil product detection, in particular to a negative pressure oil product sampler with good air tightness. Background Art

[0002] The rapid development of my country's economy has led to a large demand for oil products. However, before these oil products are used, they need to undergo a series of tests. The conventional oil testing items include: kinematic viscosity, moisture, flash point, freezing point and pour point, sulfur content, density, distillation range, acid value, alkalinity, chromaticity, carbon residue, ash content, calorific value, total sediment, mechanical impurities, insoluble matter, water separability, etc., as well as the testing of the intrinsic quality of the oil products. Before the oil products are tested, they need to be sampled.

[0003] In the prior art, a Chinese patent discloses an oil sampler (authorization announcement number CN209802761U). This patented technology can simultaneously sample the upper, middle and lower layers of the oil by setting a main oil inlet pipe, a first auxiliary oil inlet pipe, a second auxiliary oil inlet pipe and a third auxiliary oil pipe. By designing the diameters of the first auxiliary oil inlet pipe, the second auxiliary oil inlet pipe and the third auxiliary oil pipe to increase in sequence, the volumes of the upper, middle and lower layers of the oil entering the outer cylinder can be made substantially the same. At the same time, by setting an oil mixing pile, since the outer diameter of the oil mixing pile increases from bottom to top, the oil just entering the outer cylinder generates a vortex force due to the gradual increase in the volume space, so that the oil can rotate and rise around the oil mixing pile, so that the oil inside the outer cylinder is evenly mixed, and uniform sampling is achieved, thereby reducing the error of the oil detection result.

[0004] However, the above document uses negative pressure generated by piston movement to sample oil, wherein the oil is in direct contact with the piston, and some oils are corrosive, which will corrode the piston, causing the piston to fail to seal, resulting in leakage of oil. Therefore, those skilled in the art provide a negative pressure oil sampler with good airtightness to solve the problems raised in the above background technology. Utility Model Content

[0005] The utility model aims to provide a negative pressure oil sampler with good air tightness to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A negative pressure oil sampler with good airtightness, comprising a sampling box. Two sealed connecting pipes are fixedly and through-connected to the side of the sampling box. A sampling hose and a liquid discharge hose are respectively installed on the two sealed connecting pipes. An inlet liquid cavity and a liquid discharge cavity are respectively formed inside the sampling box. Floating balls are arranged inside both the inlet liquid cavity and the liquid discharge cavity. The inlet liquid cavity and the liquid discharge cavity are both through-connected to the sealed connecting pipes. A liquid storage cavity and a negative pressure cavity are arranged between the inlet liquid cavity and the liquid discharge cavity. A diaphragm is fixedly connected between the liquid storage cavity and the negative pressure cavity. An external connecting pipe is fixedly and through-connected to one side of the sampling box. A cylinder is installed inside the external connecting pipe. The output end of the cylinder is fixedly connected with a movable plug. A collecting pipe is fixedly and through-connected to one side of the liquid discharge hose.

[0008] As a further scheme of the present utility model: Among them, spiral connecting grooves are formed on both of the two sealed connecting pipes. Spiral connecting pipes are fixedly and through-connected to both the sampling hose and the liquid discharge hose. A threaded pipe sleeve is spirally connected to the spiral connecting pipe. One end of the spiral connecting pipe is fixedly and through-connected with a rubber connecting sleeve. A through hole is formed on the rubber connecting sleeve. The threaded pipe sleeve is spirally connected to the spiral connecting groove.

[0009] As a further scheme of the present utility model: Among them, a sliding rod is fixedly connected inside both the inlet liquid cavity and the liquid discharge cavity. The sliding rod is slidably connected with the floating ball.

[0010] As a further scheme of the present utility model: Among them, the external connecting pipe is through-connected to the negative pressure cavity. The movable plug is slidably connected with the inner wall of the external connecting pipe.

[0011] As a further scheme of the present utility model: Among them, a partition plate is fixedly connected inside the collecting pipe. A straight pipe is fixedly and through-connected to the partition plate. A floating ball valve is installed on the straight pipe. Two liquid discharge pipes are fixedly and through-connected to the collecting pipe.

[0012] As a further scheme of the present utility model: Among them, the openings at the upper and lower ends of both the inlet liquid cavity and the liquid discharge cavity are arranged in a conical shape.

[0013] Compared with the prior art, the beneficial effects of the present utility model are:

[0014] By placing the sampling hose inside the fuel tank where sampling is required and then starting the cylinder, the output end of the cylinder drives the movable plug to reciprocate inside the outer connection pipe. When the movable plug moves upward, the negative pressure chamber is in a negative pressure environment, which causes the diaphragm to bulge towards the outer connection pipe. When the diaphragm bulges, the liquid storage chamber is in a negative pressure environment, which causes the floating ball to move towards the negative pressure chamber, enabling the sampling hose to draw the fuel (sample) in the fuel tank into the liquid inlet chamber and the liquid storage chamber. When the movable plug moves downward, the negative pressure chamber is in an inflated state, causing the diaphragm to bulge towards the liquid storage chamber, increasing the pressure inside the liquid storage chamber. The sample inside the liquid storage chamber will enter the inside of the liquid discharge chamber and then enter the collection pipe through the liquid discharge hose, completing the collection of the sample; the above structure avoids direct contact between the sample and the movable plug through the diaphragm, preventing the movable plug from being corroded by the sample and improving the overall airtightness of the sampler. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure in the present utility model;

[0016] Figure 2 is a schematic cross-sectional view of the sampling box structure in the present utility model;

[0017] Figure 3 is a schematic diagram of the sampling hose structure in the present utility model;

[0018] Figure 4 is a schematic cross-sectional view of the collection pipe structure in the present utility model;

[0019] Figure 5 is a schematic cross-sectional view of the sealed connection pipe structure in the present utility model;

[0020] The corresponding relationship between the reference numerals and the component names in the drawings is as follows:

[0021] 1. Sampling box; 2. Sealed connection pipe; 201. Spiral connection groove; 3. Liquid inlet chamber; 301. Floating ball; 302. Slide rod; 303. Liquid storage chamber; 304. Diaphragm; 305. Negative pressure chamber; 306. Outer connection pipe; 307. Movable plug; 308. Cylinder; 309. Liquid discharge chamber; 4. Sampling hose; 5. Liquid discharge hose; 6. Spiral connection pipe; 601. Threaded pipe sleeve; 602. Rubber connection sleeve; 603. Through hole; 7. Collection pipe; 701. Liquid discharge pipe; 702. Partition plate; 703. Straight pipe; 704. Float valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Please refer to Figures 1 to 5: A negative pressure oil sampler with good airtightness, including a sampling box 1. Two sealed connecting pipes 2 are fixedly and penetratingly connected to the side of the sampling box 1. A sampling hose 4 and a liquid discharge hose 5 are respectively installed on the two sealed connecting pipes 2. An inlet liquid chamber 3 and a liquid discharge chamber 309 are respectively formed inside the sampling box 1. Floating balls 301 are arranged inside both the inlet liquid chamber 3 and the liquid discharge chamber 309. The inlet liquid chamber 3 and the liquid discharge chamber 309 are both in communication with the sealed connecting pipe 2. A liquid storage chamber 303 and a negative pressure chamber 305 are arranged between the inlet liquid chamber 3 and the liquid discharge chamber 309. A diaphragm 304 is fixedly connected between the liquid storage chamber 303 and the negative pressure chamber 305. An external connecting pipe 306 is fixedly and penetratingly connected to one side of the sampling box 1. A cylinder 308 is installed inside the external connecting pipe 306. The output end of the cylinder 308 is fixedly connected with a movable plug 307. One side of the liquid discharge hose 5 is fixedly and penetratingly connected with a collecting pipe 7.

[0023] Among them, by placing the sampling hose 4 inside the fuel tank that needs to be sampled, and then starting the cylinder 308, the output end of the cylinder 308 drives the movable plug 307 to reciprocate inside the external connecting pipe 306. When the movable plug 307 moves upward, the inside of the negative pressure chamber 305 is in a negative pressure environment, which causes the diaphragm 304 to bulge towards the external connecting pipe 306. When the diaphragm 304 bulges, the inside of the liquid storage chamber 303 is in a negative pressure environment, which causes the floating ball 301 to move towards the negative pressure chamber 305, and the sampling hose 4 sucks the fuel tank oil (sample) into the inlet liquid chamber 3 and the liquid storage chamber 303. When the movable plug 307 moves downward, the inside of the negative pressure chamber 305 is in an inflated state, which causes the diaphragm 304 to bulge towards the liquid storage chamber 303, and the pressure inside the liquid storage chamber 303 increases. The sample inside the liquid storage chamber 303 will enter the inside of the liquid discharge chamber 309, and then enter the collecting pipe 7 through the liquid discharge hose 5, completing the collection of the sample.

[0024] Further, when the movable plug 307 moves downward, the floating ball 301 inside the inlet liquid chamber 3 will block the sealed connecting pipe 2, so that the sample inside the inlet liquid chamber 3 and the liquid storage chamber 303 will not return to the inside of the fuel tank through the sealed connecting pipe 2. Similarly, when the movable plug 307 moves upward, the floating ball 301 inside the liquid discharge chamber 309 will block the connection port between the liquid discharge chamber 309 and the liquid storage chamber 303, so that the oil inside the collecting pipe 7 will not return to the liquid storage chamber 303.

[0025] Preferably, spiral connecting grooves 201 are opened on both of the two sealed connecting pipes 2. Spiral connecting pipes 6 are fixedly and penetratingly connected to both the sampling hose 4 and the liquid discharge hose 5. A threaded pipe sleeve 601 is spirally connected to the spiral connecting pipe 6. One end of the spiral connecting pipe 6 is fixedly and penetratingly connected with a rubber connecting sleeve 602. A through hole 603 is opened on the rubber connecting sleeve 602. The threaded pipe sleeve 601 is spirally connected with the spiral connecting groove 201.

[0026] When the spiral connecting pipe 6 is connected to the sealed connecting pipe 2, first insert the rubber connecting sleeve 602 into the spiral connecting groove 201 so that the through hole 603 communicates with the sealed connecting pipe 2, and then screw the threaded pipe sleeve 601 with the spiral connecting groove 201. When the threaded pipe sleeve 601 is connected to the spiral connecting groove 201, it will compress the rubber connecting sleeve 602, causing the rubber connecting sleeve 602 to expand inside the spiral connecting groove 201, enhancing the airtightness and sealing performance of the connection.

[0027] Preferably, a slide bar 302 is fixedly connected inside the liquid inlet chamber 3 and the liquid discharge chamber 309, and the slide bar 302 is slidably connected to the floating ball 301.

[0028] Among them, the provided slide bar 302 limits the moving direction of the floating ball 301, preventing the floating ball 301 from rolling around inside the liquid inlet chamber 3 and the liquid discharge chamber 309 and failing to complete the function of sealing and blocking.

[0029] Preferably, the outer connecting pipe 306 communicates with the negative pressure chamber 305, and the movable plug 307 is slidably connected to the inner wall of the outer connecting pipe 306.

[0030] Among them, when the movable plug 307 reciprocates inside the outer connecting pipe 306, it will cause the diaphragm 304 to bulge left and right, enabling the negative pressure chamber 305 to extract samples from the fuel tank.

[0031] Preferably, a partition plate 702 is fixedly connected inside the collection pipe 7, a straight pipe 703 is fixedly and through-connected to the partition plate 702, a float valve 704 is installed on the straight pipe 703, and two drain pipes 701 are fixedly and through-connected to the collection pipe 7.

[0032] Among them, the setting of the partition plate 702 can sample the fuel tank at different depths; for example, when sampling the fuel tank at a shallower depth, the sample will directly enter the bottom of the collection pipe 7. When the bottom of the collection pipe 7 is full, the float valve 704 will close the straight pipe 703, and then the fuel tank sample at a shallower depth can be sampled. The partition plate 702 can separate the oil products at different positions.

[0033] Preferably, the openings at the upper and lower ends of the liquid inlet chamber 3 and the liquid discharge chamber 309 are both tapered.

[0034] Among them, the position of the sealed connecting pipe 2 on one side of the liquid discharge cavity 309 is at the middle position of the liquid discharge cavity 309. In this way, when the floating ball 301 inside the liquid discharge cavity 309 moves upward, the floating ball 301 will not block the sealed connecting pipe 2, allowing the sample to enter the sealed connecting pipe 2; while the sealed connecting pipe 2 on one side of the liquid inlet cavity 3 is located at the bottom side of the liquid inlet cavity 3. When the floating ball 301 moves downward, it can block the sealed connecting pipe 2, preventing the sample from flowing out through the sealed connecting pipe 2. Moreover, the sliding rod 302 inside the liquid inlet cavity 3 is relatively short. When the floating ball 301 moves upward, the floating ball 301 will not block the discharge port of the liquid inlet cavity 3, enabling the oil product in the sampling hose 4 to enter the liquid storage cavity 303.

[0035] Working principle: Place the sampling hose 4 inside the fuel tank that needs to be sampled, and then start the cylinder 308. The output end of the cylinder 308 drives the piston 307 to reciprocate inside the outer connecting pipe 306. When the piston 307 moves upward, the negative pressure cavity 305 will be in a negative pressure environment, which will cause the diaphragm 304 to bulge towards the outer connecting pipe 306. When the diaphragm 304 bulges, the liquid storage cavity 303 will be in a negative pressure environment, causing the floating ball 301 to move towards the negative pressure cavity 305, and the sampling hose 4 will suck the fuel tank oil product (sample) into the liquid inlet cavity 3 and the liquid storage cavity 303. When the piston 307 moves downward, the floating ball 301 inside the liquid inlet cavity 3 will block the sealed connecting pipe 2, preventing the sample inside the liquid inlet cavity 3 and the liquid storage cavity 303 from returning to the fuel tank through the sealed connecting pipe 2; when the piston 307 moves downward, the negative pressure cavity 305 is in an inflated state, causing the diaphragm 304 to bulge towards the liquid storage cavity 303, increasing the pressure inside the liquid storage cavity 303. The sample inside the liquid storage cavity 303 will enter the inside of the liquid discharge cavity 309, and then enter the collection pipe 7 through the liquid discharge hose 5, completing the collection of the sample. Among them, when the piston 307 moves upward, the floating ball 301 inside the liquid discharge cavity 309 will block the connection port between the liquid discharge cavity 309 and the liquid storage cavity 303, preventing the oil inside the collection pipe 7 from returning to the liquid storage cavity 303.

[0036] The above is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A negative pressure oil sampler with good air tightness, comprising a sampling box (1), characterized in that: The sides of the sampling box (1) are fixed and connected with two groups of sealed connecting pipes (2), and the two groups of sealed connecting pipes (2) are respectively installed with sampling hoses (4) and drainage hoses (5). The interior of the sampling box (1) is respectively provided with a liquid inlet cavity (3) and a liquid drainage cavity (309), and the liquid inlet cavity (3) and the liquid drainage cavity (309) are both provided with floating balls (301). The liquid inlet cavity (3) and the liquid drainage cavity (309) are both connected with the sealed connecting pipes (2). The liquid inlet cavity (3) and the liquid drainage cavity (309) are respectively provided with floating balls (301). A liquid storage chamber (303) and a negative pressure chamber (305) are provided between the liquid discharge chamber (309), a diaphragm (304) is fixedly connected between the liquid storage chamber (303) and the negative pressure chamber (305), an external pipe (306) is fixedly connected and penetrated on one side of the sampling box (1), a cylinder (308) is installed inside the external pipe (306), a movable plug (307) is fixedly connected to the output end of the cylinder (308), and a collecting pipe (7) is fixedly connected and penetrated on one side of the liquid discharge hose (5).

2. A negative pressure oil sampler with good air tightness according to claim 1, characterized in that: The two groups of sealed connecting pipes (2) are both provided with spiral connecting grooves (201); the sampling hose (4) and the drain hose (5) are both fixedly provided with spiral connecting pipes (6) which are connected in a through-flow manner; the spiral connecting pipes (6) are spirally provided with a threaded pipe sleeve (601); one end of the spiral connecting pipe (6) is fixedly provided with a rubber connecting sleeve (602) which is connected in a through-flow manner; the rubber connecting sleeve (602) is provided with a through hole (603); and the threaded pipe sleeve (601) is spirally provided with the spiral connecting grooves (201).

3. A negative pressure oil sampler with good air tightness according to claim 1, characterized in that: The insides of the liquid inlet chamber (3) and the liquid discharge chamber (309) are fixedly connected with a sliding rod (302), and the sliding rod (302) is slidably connected to the floating ball (301).

4. The negative pressure oil sampler with good air tightness according to claim 1, characterized in that: The external tube (306) is connected to the negative pressure chamber (305), and the movable plug (307) is slidably connected to the inner wall of the external tube (306).

5. The negative pressure oil sampler with good air tightness according to claim 1, characterized in that: A partition plate (702) is fixedly connected inside the collecting pipe (7), a straight pipe (703) is fixedly connected to and through the partition plate (702), a float valve (704) is installed on the straight pipe (703), and two groups of drainage pipes (701) are fixedly connected to and through the collecting pipe (7).

6. The negative pressure oil sampler with good air tightness according to claim 1, characterized in that: The openings at the upper and lower ends of the liquid inlet cavity (3) and the liquid discharge cavity (309) are both arranged in a cone shape.

Images