CN111076981B - Deep water sampling mechanism for laboratory sewage detection and sampling method thereof - Google Patents
Deep water sampling mechanism for laboratory sewage detection and sampling method thereof Download PDFInfo
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- CN111076981B CN111076981B CN201911410395.1A CN201911410395A CN111076981B CN 111076981 B CN111076981 B CN 111076981B CN 201911410395 A CN201911410395 A CN 201911410395A CN 111076981 B CN111076981 B CN 111076981B
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- 238000005070 sampling Methods 0.000 title claims abstract description 67
- 230000007246 mechanism Effects 0.000 title claims abstract description 52
- 239000010865 sewage Substances 0.000 title claims abstract description 18
- 238000001514 detection method Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 72
- 238000000034 method Methods 0.000 title claims description 19
- 239000007788 liquid Substances 0.000 claims abstract description 53
- 239000000725 suspension Substances 0.000 claims abstract description 29
- 239000003570 air Substances 0.000 claims description 54
- 238000007789 sealing Methods 0.000 claims description 40
- 230000008569 process Effects 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 239000012080 ambient air Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 239000003566 sealing material Substances 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/16—Devices for withdrawing samples in the liquid or fluent state with provision for intake at several levels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
- G01N2001/1418—Depression, aspiration
- G01N2001/1427—Positive displacement, piston, peristaltic
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- Hydrology & Water Resources (AREA)
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Abstract
The invention discloses a deepwater sampling mechanism for laboratory sewage detection, which comprises an underwater suspension rope, wherein the tail end of the underwater suspension rope is connected with a deepwater sampling mechanism, and the deepwater sampling mechanism can automatically sample after sinking to a preset depth below the liquid level under the traction of the underwater suspension rope; the deepwater sampling mechanism comprises a vertical barrel, a top cover is fixedly and hermetically arranged at the top of the barrel, and the lower end of the underwater suspension rope is fixedly connected with the top cover; a balance weight is connected below the cylinder body; the structure of the invention omits electronic control, and the mechanism is a pure mechanical structure, thereby avoiding the need of making a high-cost sampling mechanism with high waterproof grade for electronic components in deepwater sampling.
Description
Technical Field
The invention belongs to the field of sewage detection.
Background
The pollutant detection of deep water sample can better reflect the pollution accumulation degree of the water body, the opening of an underwater electronic valve needs to be controlled at the bank side in the existing sewage sample, electronic devices need to be used, and due to the deep water sample, the waterproof grade of the product needs to be high, so that the cost is huge.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a deep water sampling mechanism for laboratory sewage detection without an electronic device and a sampling method thereof.
The technical scheme is as follows: in order to achieve the purpose, the deepwater sampling mechanism for laboratory sewage detection comprises an underwater suspension rope, wherein the tail end of the underwater suspension rope is connected with the deepwater sampling mechanism, and the deepwater sampling mechanism can automatically sample after sinking to a preset depth below the liquid level under the traction of the underwater suspension rope.
Further, the deepwater sampling mechanism comprises a vertical cylinder, a top cover is fixedly and hermetically arranged at the top of the cylinder, and the lower end of the underwater suspension rope is fixedly connected with the top cover; and a balance weight is connected below the cylinder body.
Further, a piston channel is arranged in the cylinder body, and an upper piston and a lower piston are coaxially and movably arranged in the piston channel; the upper side of the upper piston is provided with a closed air chamber, a movable vacuum chamber is arranged between the upper piston and the lower piston, and the lower side of the lower piston is provided with a hydraulic chamber; the lower end of the hydraulic chamber is communicated with the outside;
the upper piston and the lower piston are fixedly connected through a connecting rod with the same axle center; the lower piston is fixedly connected with the balance weight through a vertical suspension rod.
Furthermore, an annular limiting inner edge is integrally arranged on the inner wall of the upper end of the hydraulic chamber, and the lower end surface of the lower piston contacts with the upper surface of the limiting inner edge.
Further, a hollow channel is coaxially arranged inside the suspension rod, and the upper end of the hollow channel extends to the middle height of the connecting rod; a liquid outlet hole is formed in the middle of the connecting rod, and the liquid outlet hole enables the middle of the movable vacuum chamber and the top end of the hollow channel to be communicated with each other; a liquid suction bent channel is arranged inside the balance weight, one end of the liquid suction bent channel is a liquid suction port, and the liquid suction port is positioned on the upper surface of the balance weight; the other end of the liquid suction port is communicated with the lower end of the hollow channel;
an annular sealing sleeve is movably sleeved at the middle height of the connecting rod, and the inner wall of the sealing sleeve seals the liquid outlet; the outer wall of the seal sleeve is fixedly supported and connected with the inner wall of the movable vacuum chamber through a support rod; after the connecting rod and the sealing sleeve relatively slide along the axis direction, the sealing sleeve can be separated from the liquid outlet hole.
Furthermore, the inner wall of the sealing sleeve is made of silica gel sealing materials.
Furthermore, the lower end of the balance weight is coaxially connected with a threaded rod extending downwards; the water-saving screw rod is characterized by further comprising a plurality of different weight balancing weights, each weight balancing weight is of a disc structure with the density larger than water, a threaded hole is formed in the axis of each weight balancing weight and is coaxial with the axis, and the weight balancing weights can be screwed down on the threaded rod through the threaded holes.
Further, a hard air pressure balance pipe is connected to the top cover, one end of the air pressure balance pipe is communicated with the outside, and the other end of the air pressure balance pipe is communicated with the upper end of the closed air chamber; the air pressure balance pipe is also provided with a manual ball valve; and the top cover is also provided with a barometer, and the barometer can detect the air pressure in the sealed air chamber.
Further, the side wall of the cylinder body is also fixedly connected with a hard negative pressure suction pipe, one end of the negative pressure suction pipe is communicated with the outside, the other end of the negative pressure suction pipe is communicated with the middle part of the movable vacuum chamber, and a one-way valve is arranged in the negative pressure suction pipe; the fluid in the vacuum chamber can flow out from the negative pressure suction pipe through the one-way valve, and the external fluid cannot flow into the vacuum chamber through the one-way valve.
Further, the sampling method of the deepwater sampling mechanism for laboratory sewage detection comprises the following steps:
firstly, opening a ball moving valve at the bank of a sampled water body, communicating an atmospheric environment with a closed air chamber through an air pressure balance pipe so as to keep the closed air chamber consistent with atmospheric pressure, and then pulling a balance weight downwards so as to enable an upper piston and a lower piston to move downwards in the same direction until the lower end surface of the lower piston contacts the upper surface of the limiting inner edge, and at the moment, the inner wall of a sealing sleeve just blocks a liquid outlet;
then manually closing the manual ball valve, so that the closed air chamber is restored to a closed state again, and the air pressure in the closed air chamber is consistent with the ambient air pressure;
step two, installing a counterweight with corresponding weight according to the target depth, wherein the heavier the counterweight is, the deeper the expected sampling depth is;
continuously sucking away air in the movable vacuum chamber through a negative pressure suction pipe by an external negative pressure machine, so that a negative pressure environment is formed in the movable vacuum chamber; then taking off the external negative pressure machine, wherein the movable vacuum chamber is in a negative pressure vacuum state relative to the external atmospheric pressure, and at the moment, due to the existence of the one-way valve, external air cannot enter the movable vacuum chamber through the negative pressure suction pipe;
fourthly, the deepwater sampling mechanism is sunk into a water body to be sampled under the traction of the underwater suspension rope, and along with the integral sinking of the deepwater sampling mechanism, the deeper the water is, the higher the water pressure in the water pressure chamber is, and after the water depth reaches a preset depth, the upward thrust of the water pressure in the water pressure chamber on the lower piston is enough to overcome the gravity of a counterweight and the static friction force borne by the upper piston, the lower piston and the sealing sleeve; at the moment, the lower piston is pushed by water pressure to move upwards for a certain distance, the upward movement of the lower piston can drive the connecting rod, the upper piston and the movable vacuum chamber to synchronously move upwards for a certain distance, and the sealing sleeve cannot change position due to the constraint of the supporting rod, so that the connecting rod and the sealing sleeve relatively slide along the axial direction, and the sealing sleeve can be separated from the liquid outlet hole; the movable vacuum chamber is communicated with the water body at the depth through the hollow channel and the liquid suction bent channel; at the moment, water near the counter weight is sucked into the vacuum chamber through the hollow channel and the liquid suction bent channel under the action of negative pressure, so that a sewage sample at the depth is accumulated in the vacuum chamber;
step five, the underwater suspension rope pulls the deep water sampling mechanism upwards to the shore, and in the process that the deep water sampling mechanism is moved upwards, as the position of the deep water sampling mechanism is shallower and shallower, the water pressure in the water pressure chamber is automatically reduced, so that the sealing sleeve can be restored to the state of plugging the liquid outlet hole, and the deep water sampling mechanism is prevented from being diluted by water at the shallow position in the process of pulling upwards;
and step six, after the deepwater sampling mechanism is on the shore, the manual ball valve is opened again for balancing air pressure, the balance weight is pushed to enable the sealing sleeve to be in a state of being separated from the liquid outlet hole, the vacuum chamber is enabled to return to normal pressure, water absorption is facilitated, then the barrel is adjusted to be suitable for posture, the side with the negative pressure suction pipe faces downwards, then an external liquid suction pump is adopted to suck out a sewage sample in the vacuum chamber through the negative pressure suction pipe, and all sampling procedures are completed.
Has the advantages that: the structure of the invention omits electronic control, and the mechanism is a pure mechanical structure, thus avoiding the need of making a high-cost sampling mechanism with high waterproof grade for electronic components in deepwater sampling; in the process that the deepwater sampling mechanism is pulled upwards to the shore by the underwater suspension rope, as the position of the deepwater sampling mechanism is shallower and shallower, the water pressure in the water pressure chamber is automatically reduced, and the sealing sleeve is restored to the state of plugging the liquid outlet hole, so that the deepwater sampling mechanism 22 is prevented from being diluted by water at the shallow position in the process of pulling upwards, and the reliability of a sample is improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the device;
FIG. 2 is a schematic structural diagram of a deepwater sampling mechanism;
FIG. 3 is a schematic view of the lower portion of FIG. 2;
FIG. 4 is an overall cross-sectional view of the deep water sampling mechanism;
FIG. 5 is an enlarged view of the middle portion of FIG. 4;
FIG. 6 is a schematic structural view of the upper piston, the lower piston, the connecting rod, the counterweight and the suspension rod after being connected with each other.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The deepwater sampling mechanism for laboratory sewage detection as shown in fig. 1 to 6 comprises an underwater suspension rope 23, the end of the underwater suspension rope 23 is connected with a deepwater sampling mechanism 22, and the deepwater sampling mechanism 22 automatically samples after sinking to a preset depth below a liquid level 24 under the traction of the underwater suspension rope 23.
The deepwater sampling mechanism 22 comprises a vertical cylinder 3, a top cover 41 is fixedly and hermetically arranged at the top of the cylinder 3, and the lower end of the underwater suspension rope 23 is fixedly connected with the top cover 41; a counterweight 7 is connected below the cylinder 3.
A piston channel is arranged in the cylinder 3, and an upper piston 1 and a lower piston 5 are coaxially and movably arranged in the piston channel; the upper side of the upper piston 1 is provided with a closed air chamber 2, a movable vacuum chamber 4 is arranged between the upper piston 1 and the lower piston 5, and the lower side of the lower piston 5 is provided with a hydraulic chamber 6; the lower end of the hydraulic chamber 6 is communicated with the outside;
the upper piston 1 is fixedly connected with the lower piston 5 through a connecting rod 17 with the same axle center; the lower piston 5 and the counterweight 7 are fixedly connected through a vertical suspension rod 18.
An annular limiting inner edge 19 is integrally arranged on the inner wall of the upper end of the hydraulic chamber 6, and the lower end surface of the lower piston 5 contacts the upper surface of the limiting inner edge 19.
A hollow channel 15 is coaxially arranged inside the suspension rod 18, and the upper end of the hollow channel 15 extends to the middle height of the connecting rod 17; a liquid outlet 14 is arranged at the middle height of the connecting rod 17, and the liquid outlet 14 is used for communicating the middle part of the movable vacuum chamber 4 with the top end of the hollow channel 15; a liquid suction bent channel 21 is arranged inside the counterweight 7, one end of the liquid suction bent channel 21 is a liquid suction port 20, and the liquid suction port 20 is positioned on the upper surface of the counterweight 7; the other end of the liquid suction port 20 is communicated with the lower end of the hollow channel 15;
an annular sealing sleeve 16 is movably sleeved at the middle height of the connecting rod 17 of the embodiment, and in order to ensure the sealing effect, the inner wall of the sealing sleeve 16 of the embodiment is made of a silica gel sealing material; the inner wall of the sealing sleeve 16 blocks the liquid outlet 14; the outer wall of the sealing sleeve 16 is fixedly supported and connected with the inner wall of the movable vacuum chamber 4 through a support rod 13; after the connecting rod 17 and the sealing sleeve 16 relatively slide along the axial direction, the sealing sleeve 16 can be separated from the liquid outlet hole 14.
The lower end of the counterweight 7 is coaxially connected with a threaded rod 9 extending downwards; still include the different counter weight 8 of a plurality of weight, each counter weight 8 is greater than the disc structure of water for density, and the axle center department of counter weight 8 is provided with screw hole 10 with the axle center, and counter weight 8 can be screwed up on threaded rod 9 through screw hole 10.
The top cover 41 is connected with a hard air pressure balance pipe 26, one end of the air pressure balance pipe 26 is communicated with the outside, and the other end is communicated with the upper end of the closed air chamber 2; the air pressure balance pipe 26 is also provided with a manual ball valve 27; the top cover 41 is also provided with an air pressure gauge 25, and the air pressure gauge 25 can detect the air pressure in the closed air chamber 2.
The side wall of the cylinder 3 of the embodiment is also fixedly connected with a hard negative pressure suction pipe 12, one end of the negative pressure suction pipe 12 is communicated with the outside, the other end of the negative pressure suction pipe 12 is communicated with the middle part of the movable vacuum chamber 4, and a one-way valve 11 is arranged in the negative pressure suction pipe 12; the fluid in the vacuum chamber 4 can flow out from the negative pressure suction pipe 12 through the check valve 11, and the external fluid cannot flow into the vacuum chamber 4 through the check valve 11.
The sampling method and the working principle of the deepwater sampling mechanism of the device comprise the following steps:
firstly, opening a manual ball valve 27 at the bank of a sampled water body, communicating the atmospheric environment with a closed air chamber 2 through an air pressure balance pipe 26 so as to keep the closed air chamber 2 consistent with the atmospheric pressure, and then pulling a balance weight 7 downwards so as to enable an upper piston 1 and a lower piston 5 to displace downwards together until the lower end surface of the lower piston 5 contacts the upper surface of a limiting inner edge 19, and at the moment, the inner wall of a sealing sleeve 16 just blocks a liquid outlet hole 14;
then manually closing the manual ball valve 27, so that the closed air chamber 2 is restored to the closed state again, and the air pressure in the closed air chamber 2 is consistent with the ambient air pressure;
step two, installing a counterweight 8 with corresponding weight according to the target depth, wherein the heavier the counterweight 8 is, the deeper the expected sampling depth is;
continuously sucking away the air in the movable vacuum chamber 4 through a negative pressure suction pipe 12 by an external negative pressure machine, so as to form a negative pressure environment in the movable vacuum chamber 4; then taking off the external negative pressure machine, wherein the interior of the movable vacuum chamber 4 is in a negative pressure vacuum state relative to the external atmospheric pressure, and at the moment, due to the existence of the one-way valve 11, external air cannot enter the movable vacuum chamber 4 through the negative pressure suction pipe 12;
fourthly, the deepwater sampling mechanism 22 is sunk into a water body to be sampled under the traction of the underwater suspension rope 23, along with the integral sinking of the deepwater sampling mechanism 22, as the deeper the water is, the larger the water pressure in the water pressure chamber 6 is, and after the water depth reaches a preset depth, the upward thrust of the water pressure in the water pressure chamber 6 on the lower piston 5 is enough to overcome the gravity of the counterweight 8 and the counterweight 7 and the static friction force borne by the upper piston 1, the lower piston 5 and the sealing sleeve 16; at the moment, the lower piston 5 is pushed by water pressure to move upwards for a certain distance, the upward movement of the lower piston 5 can drive the connecting rod 17, the upper piston 1 and the movable vacuum chamber 4 to synchronously move upwards for a certain distance, and the sealing sleeve 16 cannot change position due to the constraint of the supporting rod 13, so that the connecting rod 17 and the sealing sleeve 16 relatively slide along the axial direction, and the sealing sleeve 16 can be separated from the liquid outlet hole 14; the movable vacuum chamber 4 is communicated with the water body at the depth through the hollow channel 15 and the liquid suction bending channel 21; at the moment, water near the counterweight 7 is sucked into the vacuum chamber 4 through the hollow channel 15 and the liquid suction bent channel 21 under the action of negative pressure, so that a sewage sample at the depth is accumulated in the vacuum chamber 4;
step five, the underwater suspension rope 23 pulls the deep water sampling mechanism 22 upwards to the shore, and in the process that the deep water sampling mechanism 22 is moved upwards, as the position of the deep water sampling mechanism 22 is shallower and shallower, the water pressure in the water pressure chamber 6 is automatically reduced, so that the sealing sleeve 16 is restored to the state of blocking the liquid outlet hole 14, and the deep water sampling mechanism 22 is prevented from being diluted by water at the shallow position in the process of pulling upwards;
and step six, after the deepwater sampling mechanism 22 is on the shore, the manual ball valve 27 is opened again for balancing air pressure, the counterweight 7 is pushed to enable the sealing sleeve 16 to be in a state of being separated from the liquid outlet hole 14, the vacuum chamber 4 is enabled to return to normal pressure, water absorption is facilitated, then the cylinder body 3 is adjusted to be in a proper posture to enable one side with the negative pressure suction pipe 12 to face downwards, then an external liquid suction pump is adopted to suck out a sewage sample in the vacuum chamber 4 through the negative pressure suction pipe 12, and all sampling procedures are completed.
The above is only a preferred embodiment of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (3)
1. Deep water sampling mechanism of laboratory sewage detection, its characterized in that: the underwater sampling device comprises an underwater suspension rope (23), wherein the deepwater sampling mechanism (22) can automatically sample after sinking to a preset depth below a liquid level (24) under the traction of the underwater suspension rope (23);
the deepwater sampling mechanism (22) comprises a vertical cylinder (3), a top cover (41) is fixedly and hermetically arranged at the top of the cylinder (3), and the lower end of the underwater suspension rope (23) is fixedly connected with the top cover (41); a balance weight (7) is connected below the barrel (3), and the lower end of the balance weight (7) is coaxially connected with a threaded rod (9) extending downwards; the water-saving device is characterized by further comprising a plurality of counterweight weights (8) with different weights, wherein each counterweight weight (8) is of a disc structure with the density larger than that of water, a threaded hole (10) is coaxially formed in the axis of each counterweight weight (8), and each counterweight weight (8) can be screwed on the threaded rod (9) through the threaded hole (10);
a piston channel is arranged in the cylinder body (3), and an upper piston (1) and a lower piston (5) are coaxially and movably arranged in the piston channel; the upper side of the upper piston (1) is provided with a closed air chamber (2), a movable vacuum chamber (4) is arranged between the upper piston (1) and the lower piston (5), and the lower side of the lower piston (5) is provided with a water pressure chamber (6); the lower end of the hydraulic chamber (6) is communicated with the outside;
the upper piston (1) is fixedly connected with the lower piston (5) through a connecting rod (17) with the same axis; the lower piston (5) is fixedly connected with the counterweight (7) through a vertical suspension rod (18);
the top cover (41) is connected with a hard air pressure balance pipe (26), one end of the air pressure balance pipe (26) is communicated with the outside, and the other end of the air pressure balance pipe is communicated with the upper end of the closed air chamber (2); the air pressure balance pipe (26) is also provided with a manual ball valve (27); the top cover (41) is also provided with an air pressure gauge (25), and the air pressure gauge (25) can detect the air pressure in the closed air chamber (2);
an annular limiting inner edge (19) is integrally arranged on the inner wall of the upper end of the hydraulic chamber (6), and the lower end surface of the lower piston (5) is in contact with the upper surface of the limiting inner edge (19);
a hollow channel (15) is coaxially arranged inside the suspension rod (18), and the upper end of the hollow channel (15) extends to the middle height of the connecting rod (17); a liquid outlet (14) is formed in the middle of the connecting rod (17), and the liquid outlet (14) is used for communicating the middle of the movable vacuum chamber (4) with the top end of the hollow channel (15); a liquid suction bent channel (21) is arranged inside the counterweight (7), a liquid suction port (20) is formed at one end of the liquid suction bent channel (21), and the liquid suction port (20) is located on the upper surface of the counterweight (7); the other end of the liquid suction bent channel is communicated with the lower end of the hollow channel (15);
an annular sealing sleeve (16) is movably sleeved at the middle height of the connecting rod (17), and the inner wall of the sealing sleeve (16) blocks the liquid outlet hole (14); the outer wall of the sealing sleeve (16) is fixedly supported and connected with the inner wall of the movable vacuum chamber (4) through a support rod (13); after the connecting rod (17) and the sealing sleeve (16) relatively slide along the axial direction, the sealing sleeve (16) can be separated from the liquid outlet hole (14);
the side wall of the cylinder body (3) is also fixedly connected with a hard negative pressure suction pipe (12), one end of the negative pressure suction pipe (12) is communicated with the outside, the other end of the negative pressure suction pipe (12) is communicated with the middle part of the movable vacuum chamber (4), and a check valve (11) is arranged in the negative pressure suction pipe (12); the fluid in the movable vacuum chamber (4) can flow out from the negative pressure suction pipe (12) through the one-way valve (11), and the external fluid can not flow into the movable vacuum chamber (4) through the one-way valve (11).
2. The deepwater sampling mechanism for laboratory sewage detection as claimed in claim 1, wherein: the inner wall of the sealing sleeve (16) is made of silica gel sealing materials.
3. The sampling method of the deepwater sampling mechanism for laboratory sewage detection as claimed in claim 1, wherein the sampling method comprises the following steps: the method comprises the following steps:
firstly, opening a manual ball valve (27) at the bank of a sampling water body, communicating an atmospheric environment with a closed air chamber (2) through an air pressure balance pipe (26), so that the closed air chamber (2) keeps consistent with atmospheric pressure, and then pulling a balance weight (7) downwards, so that an upper piston (1) and a lower piston (5) are displaced downwards together until the lower end surface of the lower piston (5) contacts the upper surface of a limiting inner edge (19), and at the moment, the inner wall of a sealing sleeve (16) just blocks a liquid outlet hole (14);
then manually closing the manual ball valve (27), so that the closed air chamber (2) is restored to a closed state again, and the air pressure in the closed air chamber (2) is consistent with the ambient air pressure;
step two, installing a counterweight (8) with corresponding weight according to the target depth, wherein the heavier the counterweight (8), the deeper the expected sampling depth;
continuously sucking away air in the movable vacuum chamber (4) through a negative pressure suction pipe (12) by an external negative pressure machine, so that a negative pressure environment is formed in the movable vacuum chamber (4); then an external negative pressure machine is taken down, the interior of the movable vacuum chamber (4) is in a negative pressure vacuum state relative to the external atmospheric pressure, and at the moment, due to the existence of the one-way valve (11), external air cannot enter the movable vacuum chamber (4) through the negative pressure suction pipe (12);
fourthly, the deepwater sampling mechanism (22) is sunk into a water body to be sampled under the traction of the underwater suspension rope (23), along with the integral sinking of the deepwater sampling mechanism (22), as the water is deeper, the water pressure in the water pressure chamber (6) is also higher, and after the water depth reaches a preset depth, the upward thrust of the water pressure in the water pressure chamber (6) on the lower piston (5) is enough to overcome the gravity of the counterweight weight (8) and the counterweight (7) and the static friction force borne by the upper piston (1), the lower piston (5) and the sealing sleeve (16); at the moment, the lower piston (5) is pushed by water pressure to move upwards for a certain distance, the upward movement of the lower piston (5) can drive the connecting rod (17), the upper piston (1) and the movable vacuum chamber (4) to synchronously move upwards for a certain distance, and the sealing sleeve (16) cannot change in position due to the constraint of the supporting rod (13), so that the connecting rod (17) and the sealing sleeve (16) relatively slide along the axial direction, and the sealing sleeve (16) can be separated from the liquid outlet hole (14); the movable vacuum chamber (4) is communicated with the water body at the depth through the hollow channel (15) and the liquid suction bent channel (21); at the moment, water near the counterweight (7) is sucked into the movable vacuum chamber (4) through the hollow channel (15) and the liquid suction bent channel (21) under the action of negative pressure, so that a sewage sample at the depth is accumulated in the movable vacuum chamber (4);
fifthly, the deep water sampling mechanism (22) is pulled upwards to the shore by the underwater suspension rope (23), and in the process that the deep water sampling mechanism (22) moves upwards, as the position of the deep water sampling mechanism (22) is shallower and shallower, the water pressure in the water pressure chamber (6) is automatically reduced, so that the sealing sleeve (16) is restored to the state of plugging the liquid outlet hole (14), and the deep water sampling mechanism (22) is prevented from being diluted by water at the shallow position in the process of pulling upwards;
and sixthly, after the deepwater sampling mechanism (22) is on the shore, the manual ball valve (27) is opened again for balancing air pressure, the balance weight (7) is pushed to enable the sealing sleeve (16) to be in a state of being separated from the liquid outlet hole (14), the movable vacuum chamber (4) is recovered to normal pressure, water absorption is facilitated, then the barrel body (3) is adjusted to be suitable for posture, the side with the negative pressure suction pipe (12) faces downwards, then an external liquid suction pump is adopted to suck out a sewage sample in the movable vacuum chamber (4) through the negative pressure suction pipe (12), and all sampling procedures are completed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911410395.1A CN111076981B (en) | 2019-12-31 | 2019-12-31 | Deep water sampling mechanism for laboratory sewage detection and sampling method thereof |
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| CN201911410395.1A CN111076981B (en) | 2019-12-31 | 2019-12-31 | Deep water sampling mechanism for laboratory sewage detection and sampling method thereof |
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| CN117554556B (en) * | 2024-01-12 | 2024-05-10 | 佳木斯大学 | Gastric juice acidity detection device for digestive system |
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| CN111076981A (en) | 2020-04-28 |
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Effective date of registration: 20240310 Address after: 330200 no.1069 Jinsha 1st Road, Xiaolan economic and Technological Development Zone, Nanchang County, Nanchang City, Jiangxi Province Patentee after: JIANGXI ZHIKE DETECTION TECHNOLOGY Co.,Ltd. Country or region after: China Address before: 215000 Room 302, building 04, Northwest District, Suzhou nano City, No. 99, Jinjihu Avenue, Suzhou Industrial Park, Suzhou City, Jiangsu Province Patentee before: JIANGSU QICHEN TESTING TECHNOLOGY Co.,Ltd. Country or region before: China |