Coal rock sample negative pressure water saturation device

Abstract

The utility model relates to the technical field of coal rock water saturation experiments, and discloses a coal rock sample negative pressure water saturation device which comprises a water tank, a test box and a sealing cover, the top of the water tank is fixedly connected with the test box, the top of the test box is rotatably connected with the sealing cover, and the bottom of the inner wall of the test box is provided with a bottom sealing gasket. A bottom sealing gasket is arranged in the test box, a sample bracket is arranged in the center of the top of the bottom sealing gasket, a plugging ring is detachably connected to the center of the interior of the sealing cover, and a top sealing ring is fixedly connected to the position, located on the outer side of the plugging ring, of the bottom of the sealing cover. According to the coal rock negative pressure saturation test box, the negative pressure space in the test box can be adjusted according to the specification of coal rock, then the dosage of air suction needed during negative pressure can be reduced, the dosage of water injection needed can be reduced, the experiment efficiency of coal rock negative pressure saturation is improved, experiment energy consumption is reduced, experiment water can be filtered and recycled through the filter basket, and then the experiment cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of coal-rock water-saturation experiments, in particular to a negative pressure water-saturation device for coal-rock samples. Background Art

[0002] With the growth of national economy's demand for energy, coal mining intensity is increasing, mining depth is increasing year by year, and surrounding rock control and maintenance of deep soft rock tunnels have become one of the main factors directly affecting mining area development and mine economic and technical indicators. Coal rock, as a porous structure, often needs to explore the influence of its water content on its mechanical structure, and different water contents of coal rock require artificial intervention, that is, saturation experiment of coal rock.

[0003] After searching, the patent with announcement number CN209559604U is: a negative pressure water saturation device for coal rock samples, including a vacuum pump, a vacuum cover, a coal rock sample chamber, a coal rock sample clamping device, a pressure gauge, a water collector, a pressure regulating valve, and a water injection port. The coal rock sample chamber is located at the lower part; the coal rock clamping device is connected to the coal rock sample chamber; the water collector and the vacuum pump are connected to the top plate of the coal rock sample chamber; the vacuum cover is covered on the top plate of the coal rock sample chamber; the water injection port is connected to the coal rock sample chamber. Compared with the prior art, the negative pressure water saturation device for coal rock samples uses a vacuum pump to draw air, so that the vacuum cover is in a negative pressure state, further forming a pressure difference between the vacuum cover and the coal rock sample chamber, expelling gas in the coal rock sample, improving the water seepage efficiency, further reducing the water saturation time of the coal rock sample, and improving the sample water saturation efficiency and the experimental effect.

[0004] Since the specifications of the coal and rocks to be tested are different, and the equipment disclosed in the above patent cannot adjust its internal space according to the specifications of the coal and rocks, it takes a long time to perform negative pressure air extraction and water supply, which will affect the test efficiency. For this reason, the present application proposes a negative pressure water saturation device for coal and rock samples. Utility Model Content

[0005] The purpose of the utility model is to provide a negative pressure water saturation device for coal and rock samples in order to solve the above problems, thereby solving the problems mentioned in the background technology.

[0006] In order to solve the above problems, the utility model provides a technical solution:

[0007] A negative pressure water saturation device for coal and rock samples comprises a water tank, a test box and a sealing cover, wherein the top of the water tank is fixedly connected to the test box, the top of the test box is rotatably connected to the sealing cover, the bottom of the inner wall of the test box is provided with a bottom sealing gasket, the top center of the bottom sealing gasket is provided with a sample holder, the inner center of the sealing cover is detachably connected to a sealing ring, the bottom of the sealing cover and the outside of the sealing ring are fixedly connected with a top sealing ring, a spacer tube is provided inside the test box and the outside of the sample holder, and the two ends of the spacer tube are respectively in contact with the top sealing ring and the bottom sealing gasket.

[0008] As a preferred solution of the utility model, an equipment box is fixedly connected to the outside of the test box, a vacuum pump is fixedly connected to the inside of the equipment box, a negative pressure tube is fixedly connected to the input end of the vacuum pump, an end of the negative pressure tube away from the vacuum pump passes through a sealing ring and extends to the inside of the test box, and a pressure gauge is arranged above the sealing ring.

[0009] As a preferred solution of the utility model, a water pump is fixedly connected to the inside of the equipment box, the input end of the water pump is fixedly connected to a water suction pipe, the bottom end of the water suction pipe extends to the inside of the water tank, the output end of the water pump is fixedly connected to a conduit, and the end of the conduit away from the water pump passes through a sealing ring and extends to the inside of the test box.

[0010] As a preferred solution of the utility model, a drain pipe is fixedly connected inside the test box and on one side of the bottom sealing gasket, the bottom end of the drain pipe extends into the water tank, a filter basket is fixedly connected inside the water tank, and the filter basket is located between the drain pipe and the suction pipe.

[0011] As a preferred solution of the utility model, a control panel is fixedly connected to the outside of the test box, and the vacuum pump and the water pump are electrically connected to the control panel respectively.

[0012] The beneficial effect of the utility model is that by arranging a spacing cylinder inside the test box for use with the sealing cover, the negative pressure space inside the test box can be adjusted according to the specifications of the coal rock, thereby reducing the amount of air required for extraction during negative pressure, and also reducing the amount of water required for injection, so as to improve the experimental efficiency of the negative pressure saturation of coal rock, reduce the experimental energy consumption, and the experimental water can be filtered and reused through the filter basket, thereby reducing the experimental cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] For ease of explanation, the present invention is described in detail by the following specific implementations and drawings.

[0014] Figure 1 It is a schematic diagram of the internal structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 3 This utility model Figure 1 Enlarged view of point A in the middle.

[0017] In the figure: 1. water tank; 2. test box; 3. sealing cover; 4. bottom sealing gasket; 5. sample holder; 6. spacer tube; 7. top sealing ring; 8. drain pipe; 9. filter basket; 10. sealing ring; 11. equipment box; 12. vacuum pump; 13. negative pressure pipe; 14. pressure gauge; 15. water pump; 16. suction pipe; 17. conduit; 18. control panel. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] Example

[0020] See also Figure 1-Figure 3 The utility model provides a technical solution: a negative pressure water saturation device for coal rock samples, comprising a water tank 1, a test box 2 and a sealing cover 3, the top of the water tank 1 is fixedly connected with the test box 2, the top of the test box 2 is rotatably connected with the sealing cover 3, the bottom of the inner wall of the test box 2 is provided with a bottom sealing gasket 4, and the top center of the bottom sealing gasket 4 is provided with a sample bracket 5. Since the sample bracket 5 is a porous design, the efficiency of air permeability and water permeability can be ensured during negative pressure air extraction and water saturation. The inner center of the sealing cover 3 is detachably connected with a sealing ring 10, and the bottom of the sealing cover 3 and the outer side of the sealing ring 10 are fixedly connected with a top sealing ring 7. Both the bottom sealing gasket 4 and the top sealing ring 7 are made of rubber material, which can ensure the service life under the premise of ensuring the sealing performance. A spacing tube 6 is provided inside the test box 2 and outside the sample bracket 5, and the two ends of the spacing tube 6 are respectively in contact with the top sealing ring 7 and the bottom sealing gasket 4, and the spacing tube 6 can adjust the negative pressure space inside the test box 2 according to the specifications of the coal rock to improve the experimental efficiency of the negative pressure water saturation of the coal rock.

[0021] Furthermore, an equipment box 11 is fixedly connected to the outside of the test box 2, a vacuum pump 12 is fixedly connected to the inside of the equipment box 11, a negative pressure pipe 13 is fixedly connected to the input end of the vacuum pump 12, and one end of the negative pressure pipe 13 away from the vacuum pump 12 passes through the sealing ring 10 and extends to the inside of the test box 2. The vacuum pump 12 cooperates with the negative pressure pipe 13 to extract the gas inside the spacer tube 6. A pressure gauge 14 is arranged above the sealing ring 10. Under the action of the pressure gauge 14, the internal pressure can be monitored and the internal negative pressure can be controlled according to demand.

[0022] Furthermore, a water pump 15 is fixedly connected to the inside of the equipment box 11, and a water suction pipe 16 is fixedly connected to the input end of the water pump 15, and the bottom end of the water suction pipe 16 extends to the inside of the water tank 1, and a conduit 17 is fixedly connected to the output end of the water pump 15, and the end of the conduit 17 away from the water pump 15 passes through the sealing ring 10 and extends to the inside of the test box 2.

[0023] Furthermore, a drain pipe 8 is fixedly connected inside the test box 2 and on one side of the bottom sealing gasket 4. The bottom end of the drain pipe 8 extends into the water tank 1. A filter basket 9 is fixedly connected inside the water tank 1, and the filter basket 9 is located between the drain pipe 8 and the suction pipe 16. The filter basket 9 can filter the used water for subsequent experiments.

[0024] Furthermore, a control panel 18 is fixedly connected to the outside of the test box 2 , and the vacuum pump 12 and the water pump 15 are electrically connected to the control panel 18 , respectively.

[0025] Working principle: Select the corresponding spacing tube 6 according to the specifications of the coal rock to be tested under negative pressure and saturated with water, then open the sealing cover 3, and place the coal rock sample in the groove inside the sample holder 5. Since the sample holder 5 is porous in design, the efficiency of air permeability and water permeability can be ensured during negative pressure extraction and saturation. Then place the spacing tube 6 on the bottom sealing gasket 4 inside the test box 2, and ensure that the spacing tube 6 is set on the outside of the coal rock sample, and cover the sealing cover 3. At this time, the top sealing ring 7 at the bottom of the sealing cover 3 squeezes the spacing tube 6, thereby forming an independent closed space inside the test box 2, and the vacuum pump 12 cooperates with the negative pressure tube 13 to squeeze the spacing tube 6. The gas inside the spacer tube 6 is extracted to form a negative pressure in the space inside the spacer tube 6. The internal pressure can be detected under the action of the barometer 14. After the vacuum extraction is completed, the water inside the water tank 1 is extracted through the water pump 15 and the water suction pipe 16, and transported to the inside of the spacer tube 6 with the cooperation of the conduit 17. At this time, the coal rock sample in the vacuum state can adsorb water to complete its saturation experiment under negative pressure. After the experiment is completed, the sealing cover 3 is opened and the spacer tube 6 is taken out. Then the water inside the test box 2 can flow into the water tank 1 through the drain pipe 8, and the water is filtered under the action of the filter basket 9 for subsequent experimental use.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A negative pressure water saturation device for coal and rock samples, comprising a water tank (1), a test box (2) and a sealing cover (3), It is characterized in that The top of the water tank (1) is fixedly connected to a test box (2), the top of the test box (2) is rotatably connected to a sealing cover (3), the bottom of the inner wall of the test box (2) is provided with a bottom sealing gasket (4), the top center of the bottom sealing gasket (4) is provided with a sample holder (5), the inner center of the sealing cover (3) is detachably connected to a sealing ring (10), the bottom of the sealing cover (3) and located outside the sealing ring (10) are fixedly connected to a top sealing ring (7), the inside of the test box (2) and located outside the sample holder (5) are provided with a spacing tube (6), and the two ends of the spacing tube (6) are in contact with the top sealing ring (7) and the bottom sealing gasket (4) respectively.

2. A negative pressure water saturation device for coal and rock samples according to claim 1, It is characterized in that The outside of the test box (2) is fixedly connected to an equipment box (11), the inside of the equipment box (11) is fixedly connected to a vacuum pump (12), the input end of the vacuum pump (12) is fixedly connected to a negative pressure pipe (13), the end of the negative pressure pipe (13) away from the vacuum pump (12) passes through the sealing ring (10) and extends to the inside of the test box (2), and a pressure gauge (14) is arranged above the sealing ring (10).

3. A negative pressure water saturation device for coal and rock samples according to claim 2, It is characterized in that A water pump (15) is fixedly connected to the interior of the equipment box (11); an input end of the water pump (15) is fixedly connected to a water suction pipe (16); a bottom end of the water suction pipe (16) extends into the interior of the water tank (1); an output end of the water pump (15) is fixedly connected to a conduit (17); an end of the conduit (17) away from the water pump (15) passes through a sealing ring (10) and extends into the interior of the test box (2).

4. A negative pressure water saturation device for coal and rock samples according to claim 3, It is characterized in that A drain pipe (8) is fixedly connected inside the test box (2) and located on one side of the bottom sealing gasket (4); the bottom end of the drain pipe (8) extends into the inside of the water tank (1); a filter basket (9) is fixedly connected inside the water tank (1), and the filter basket (9) is located between the drain pipe (8) and the water suction pipe (16).

5. A negative pressure water saturation device for coal and rock samples according to claim 2, It is characterized in that A control panel (18) is fixedly connected to the outside of the test box (2), and the vacuum pump (12) and the water pump (15) are electrically connected to the control panel (18) respectively.

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