Quantitative sampling valve of liquid circulation pipeline

Abstract

The invention relates to the technical field of sampling devices, in particular to a quantitative sampling valve of a liquid circulation pipeline, which comprises a ball valve, a sampling barrel and a sampling assembly. The sampling barrel is connected with a pipeline through a ball valve. When the ball valve is opened, a sampling channel is formed between the ball valve and the sampling barrel. The sampling assembly and the sampling channel are slidably sealed. The sampling assembly divides the sampling channel into an upper channel and a lower channel. According to the quantitative sampling valve of the liquid circulation pipeline, the ball valve, the sampling barrel and the sampling assembly are arranged to be matched, gas and residual liquid in the upper channel can be discharged back to the pipeline, the situation that a new liquid sample is polluted by previous liquid sample residues is avoided, and the sampling accuracy and representativeness are improved. And after the sampling is completed, the liquid sample is temporarily sealed in the sampling barrel by utilizing the sealing between the sampling assembly and the sampling barrel, so that the liquid sample is prevented from being polluted due to contact with the outside, and the liquid sample is convenient to transfer and store.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sampling devices, in particular to a quantitative sampling valve of a liquid flow pipeline. BACKGROUND

[0002] In the production process of chemical industry, pharmaceutical industry, food processing and other fields, in order to accurately monitor the reaction process and effectively control the reaction rate, the intermediate reactants in the pipeline of the production system need to be detected at irregular intervals and fixed points. As the core path of material transmission, the accurate and timely collection of the liquid sample in the liquid flow pipeline is the key link to ensure the stability of product quality and realize safe production.

[0003] For example, Chinese patent CN202110082U discloses a negative pressure type reaction kettle liquid sampling device. By controlling the gas outlet valve and the sample outlet valve, the liquid remaining in the pipeline after each sampling can be returned to the reaction kettle to continue participating in the reaction, thereby avoiding affecting the next sampling. However, in use, although the sample in the sampling pipe can return, part of the sample will still remain between the flange ball valve and the sampling device, which will pollute the second sample with the first remaining sample, seriously affecting the representativeness and accuracy of the detection result. SUMMARY

[0004] The present application provides a quantitative sampling valve of a liquid flow pipeline to solve the problem that the existing sampling valve has sample residue after sampling, which pollutes the new sample with the previous residue sample during subsequent sampling, affecting the representativeness and accuracy of the sampling.

[0005] The application discloses a liquid flow pipeline quantitative sampling valve which adopts the following technical scheme: a liquid flow pipeline quantitative sampling valve is used for sampling liquid in a pipeline, and comprises a ball valve, a sampling cylinder and a sampling assembly; the sampling cylinder is connected with the pipeline through the ball valve; the sampling cylinder is arranged along the radial direction of the pipeline, and the arrangement direction of the sampling cylinder is referred to as a first direction; the ball valve is closed in an initial state, the ball valve can be opened to communicate the pipeline and the sampling cylinder, and a sampling channel is formed between the ball valve and the sampling cylinder when the ball valve is opened, and the sampling channel is arranged along the first direction; the sampling assembly is movably arranged in the sampling channel along the first direction and is in sliding sealing with the sampling channel; the sampling assembly divides the sampling channel into an upper channel and a lower channel, the upper channel is located on the side of the lower channel which is close to the pipeline along the first direction, and the upper channel and the lower channel are communicated by moving the sampling assembly along the first direction; the movement of the sampling assembly has a first stroke, a second stroke and a third stroke, in the first stroke, the ball valve is opened, the sampling assembly is moved to the side close to the pipeline along the first direction, the upper channel is isolated from the lower channel, and gas or liquid in the upper channel flows to the pipeline; in the second stroke, the ball valve is opened, the sampling assembly is moved to the side away from the pipeline along the first direction, the upper channel is isolated from the lower channel, and liquid in the pipeline enters the upper channel; in the third stroke, the ball valve is closed, the sampling assembly is moved to the side close to the pipeline along the first direction, the upper channel is communicated with the lower channel, and liquid in the upper channel enters the lower channel.

[0006] Further, the sampling cylinder is detachably connected with the ball valve through a quick connector.

[0007] Further, the sampling cylinder is provided with a discharge port on the side away from the pipeline along the first direction, and a valve is arranged on the discharge port.

[0008] Further, the sampling assembly comprises a piston block and a piston rod; the piston block is arranged in the sampling channel and is in sliding sealing with the sampling channel; a sliding cavity is formed in the piston block, a clamping block is arranged in the sliding cavity, the clamping block is an arc-shaped block and is elastic, one end of the piston rod close to the pipeline along the first direction is movably arranged in the sliding cavity along the first direction, one end of the piston rod away from the pipeline along the first direction extends out of the sampling cylinder and is in sliding sealing with the sampling cylinder; and the piston rod is located on the side away from the pipeline along the first direction of the clamping block in the initial state.

[0009] Further, the sampling assembly further comprises a first one-way valve arranged on the piston block along the first direction, and the first one-way valve only allows liquid in the upper channel to enter the lower channel.

[0010] Further, the first one-way valve comprises a valve body and a valve ball; the valve body is arranged along the first direction and penetrates through the first direction, the valve ball is connected with the valve body through a first elastic member, and the two ends of the valve body along the first direction are referred to as a first end and a second end respectively, and the valve ball blocks the first end in the initial state; the first end of the valve body can be communicated with the upper channel, and the second end of the valve body extends into the lower channel.

[0011] Furthermore, multiple pressure holes are provided on the outer peripheral wall of the piston block, and a sealing strip is also provided on the outer peripheral wall of the piston block. The sealing strip is installed on the piston block by an elastic band and abuts against the pressure holes.

[0012] Furthermore, the ball valve includes a ball shell, a ball, and a knob. The ball shell is through in the first direction and connected to a pipeline. The ball is rotatably installed inside the ball shell and has a channel on the ball that allows liquid to flow. The knob is connected to the ball and is used to drive the ball to rotate inside the ball shell, so that the ball valve switches between open and closed. In the initial state, the ball abuts against the piston block.

[0013] Furthermore, a second one-way valve is provided on the sampling cylinder. The second one-way valve is located at the connection between the ball and the piston block. The second one-way valve only allows external gas to enter between the ball and the piston block.

[0014] Furthermore, a heat insulation cylinder is fitted onto the sampling cylinder.

[0015] The beneficial effects of this invention are as follows: The quantitative sampling valve for a liquid flow pipeline of this invention, through the combination of a ball valve, a sampling cylinder, and a sampling assembly, can discharge gas and residual liquid in the upper channel back into the pipeline, avoiding contamination of new liquid samples by residues from previous samples. This ensures that each sampling accurately reflects the current state of the liquid in the pipeline, improving the accuracy and representativeness of the sampling. Furthermore, after sampling, the seal between the sampling assembly and the sampling cylinder temporarily seals the liquid sample inside the sampling cylinder, preventing contamination from contact with the outside environment and facilitating the transfer and storage of the liquid sample. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a quantitative sampling valve for a liquid flow pipeline according to the present invention; Figure 2 This is a side view of the overall structure of an embodiment of a quantitative sampling valve for a liquid flow pipeline according to the present invention. Figure 3 for Figure 2 Sectional view at point AA along the middle; Figure 4 This is a schematic diagram of the overall structure of a quantitative sampling valve for a liquid flow pipeline according to an embodiment of the present invention, showing the ball valve when it is open. Figure 5 A sectional view of the ball valve opening in the overall structure of an embodiment of a quantitative sampling valve of a liquid flow pipeline of the present application; Figure 6 A sectional view of the ball valve opening in the overall structure of an embodiment of a quantitative sampling valve of a liquid flow pipeline of the present application; Figure 5 An enlarged view of B in the middle; Figure 7 A state diagram of the piston rod sliding in the piston block of an embodiment of a quantitative sampling valve of a liquid flow pipeline of the present application; Figure 8 A split diagram of the overall structure of an embodiment of a quantitative sampling valve of a liquid flow pipeline of the present application.

[0018] In the figure: 100, pipeline; 200, ball valve; 210, ball shell; 220, ball; 221, passage; 230, knob; 300, sampling cylinder; 310, quick connector; 320, discharge port; 330, valve; 340, heat insulation cylinder; 400, sampling assembly; 410, sampling passage; 411, upper passage; 412, lower passage; 420, piston block; 421, sliding cavity; 422, clamping block; 423, pressurizing hole; 424, sealing strip; 425, elastic band; 430, piston rod; 440, first one-way valve; 441, valve body; 442, valve ball; 443, first elastic member; 450, second one-way valve. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0020] An embodiment of a quantitative sampling valve of a liquid flow pipeline of the present application is shown in Figures 1 to 8 .

[0021] The application discloses a quantitative sampling valve of a liquid flow pipeline, which is used for sampling liquid in a pipeline 100 and comprises a ball valve 200, a sampling cylinder 300 and a sampling assembly 400. The sampling cylinder 300 is connected with the pipeline 100 through the ball valve 200. The sampling cylinder 300 is arranged along a radial direction of the pipeline 100, and the arrangement direction of the sampling cylinder 300 is referred to as a first direction. The ball valve 200 is closed in an initial state, the ball valve 200 is opened to connect the pipeline 100 and the sampling cylinder 300, and a sampling channel 410 is formed between the ball valve 200 and the sampling cylinder 300 when the ball valve 200 is opened, and the sampling channel 410 is arranged along the first direction. The sampling assembly 400 is movably arranged in the sampling channel 410 along the first direction and is in sliding sealing with the sampling channel 410. The sampling assembly 400 divides the sampling channel 410 into an upper channel 411 and a lower channel 412, the upper channel 411 is located on a side of the lower channel 412 close to the pipeline 100 along the first direction, and the upper channel 411 and the lower channel 412 are communicated by moving the sampling assembly 400 along the first direction.

[0022] The movement of the sampling assembly 400 has a first stroke, a second stroke and a third stroke. In the first stroke, the ball valve 200 is opened, the sampling assembly 400 is moved to the side close to the pipeline 100 along the first direction, the upper channel 411 is isolated from the lower channel 412, and the gas or liquid in the upper channel 411 flows to the pipeline 100; in the second stroke, the ball valve 200 is opened, the sampling assembly 400 is moved to the side away from the pipeline 100 along the first direction, the upper channel 411 is isolated from the lower channel 412, and the liquid in the pipeline 100 enters the upper channel 411; and in the third stroke, the ball valve 200 is closed, the sampling assembly 400 is moved to the side close to the pipeline 100 along the first direction, the upper channel 411 is communicated with the lower channel 412, and the liquid in the upper channel 411 enters the lower channel 412.

[0023] The ball valve 200, the sampling cylinder 300 and the sampling assembly 400 are arranged, and the pipeline 100 and the sampling cylinder 300 are connected through the ball valve 200. When it is needed to sample the liquid in the pipeline 100, the ball valve 200 is rotated to an open state, and the sampling channel 410 is communicated with the pipeline 100 at this time. Then the sampling assembly 400 is pushed to move to the side close to the pipeline 100 along the first direction in the sampling channel 410, and the gas in the upper channel 411 is pushed to the pipeline 100, at this time, the movement of the sampling assembly 400 is in the first stroke, and the upper channel 411 is isolated from the lower channel 412.

[0024] Then keep the ball valve 200 in the open state, and then move the sampling assembly 400 along the first direction to the side away from the pipeline 100, and use negative pressure to draw the liquid in the pipeline 100 into the upper channel 411 until the sampling assembly 400 moves to the inner wall surface of the sampling cylinder 300 on the side away from the pipeline 100 in the first direction, at which time the upper channel 411 is isolated from the lower channel 412, and the movement of the sampling assembly 400 is in the second stroke, and the sampling is completed.

[0025] Then close the ball valve 200, at which time the liquid originally located in the ball valve 200 will be pushed back to the pipeline 100 or continue to remain inside the ball valve 200, and the pipeline 100 and the sampling cylinder 300 are no longer connected. Then continue to push the sampling assembly 400 along the first direction to the side close to the pipeline 100, at which time the upper channel 411 is connected to the lower channel 412, and the liquid in the upper channel 411 will enter the lower channel 412, and the movement of the sampling assembly 400 is in the third stroke. That is, at this time, the sampling assembly 400 is located on the side of the liquid close to the pipeline 100 in the first direction, and the liquid sample is temporarily sealed in the sampling cylinder 300 by the sealing between the sampling assembly 400 and the sampling cylinder 300, avoiding the liquid sample from being contaminated by contacting the outside world, facilitating the transportation and storage of the liquid sample. Then the liquid sample can be transported.

[0026] At the next time of use, after opening the ball valve 200, push the sampling assembly 400 along the first direction to the side close to the pipeline 100 in the sampling channel 410, push the residual liquid in the upper channel 411 back to the pipeline 100, and repeat the above operation to sample again.

[0027] By discharging the gas and residual liquid in the upper channel 411 back to the pipeline 100, the pollution of the new liquid sample caused by the residual liquid sample of the previous time is avoided, and the accuracy and representativeness of the sampling are improved, which ensures that each sampling can truly reflect the current state of the liquid in the pipeline 100. It needs to be particularly pointed out that the liquid remaining between the ball valve 200 and the pipeline 100 can normally participate in other work although it cannot be used as a liquid sample.

[0028] In further embodiments, the sampling cylinder 300 is detachably connected to the ball valve 200 through the quick connector 310.

[0029] By connecting the sampling cylinder 300 to the ball valve 200 through the quick connector 310, when the movement of the sampling assembly 400 passes through the third stroke, at which time the sampling assembly 400 is located on the side of the liquid in the sampling cylinder 300 close to the pipeline 100 in the first direction, then the sampling cylinder 300 is detached, which is convenient for subsequent transportation and storage.

[0030] In a further embodiment, the sampling cylinder 300 is provided with a discharge port 320 on a side thereof away from the pipeline 100 in the first direction, and the discharge port 320 is provided with a valve 330.

[0031] By providing the discharge port 320 on the sampling cylinder 300 and the valve 330 on the discharge port 320, the valve 330 is closed when the sampling assembly 400 is in the first stroke. The valve 330 is opened when the sampling assembly 400 is in the second stroke, and the gas in the lower channel 412 is discharged, and the valve 330 is closed again after the discharge. After the sampling cylinder 300 is disassembled, the valve 330 can be opened again to discharge the liquid sample in the sampling cylinder 300 for subsequent detection.

[0032] Further, the sampling cylinder 300 is sleeved with a heat insulation cylinder 340.

[0033] By sleeving the heat insulation cylinder 340 on the sampling cylinder 300, when the liquid with high temperature in the pipeline 100 is sampled, the heat insulation cylinder 340 can be used for heat insulation, which is convenient to take.

[0034] In a further embodiment, the sampling assembly 400 includes a piston block 420 and a piston rod 430. The piston block 420 is installed in the sampling channel 410 and is in sliding seal with the sampling channel 410. The piston block 420 is provided with a sliding cavity 421, and the sliding cavity 421 is provided with a clamping block 422. The clamping block 422 is an arc-shaped block and has elasticity. The piston rod 430 is slidably installed in the sliding cavity 421 at an end thereof close to the pipeline 100 in the first direction, and the piston rod 430 extends out of the sampling cylinder 300 at an end thereof away from the pipeline 100 in the first direction and is in sliding seal with the sampling cylinder 300. In the initial state, the piston rod 430 is located on the side of the clamping block 422 away from the pipeline 100 in the first direction.

[0035] In a further embodiment, the sampling assembly 400 further includes a first one-way valve 440 provided on the piston block 420 in the first direction. The first one-way valve 440 allows only the liquid in the upper channel 411 to enter the lower channel 412.

[0036] The first one-way valve 440 includes a valve body 441 and a valve ball 442. The valve body 441 is provided in the first direction and penetrates through in the first direction. The valve ball 442 is connected to the valve body 441 through a first elastic member 443. The two ends of the valve body 441 in the first direction are referred to as a first end and a second end, respectively. In the initial state, the valve ball 442 blocks the first end. The first end of the valve body 441 can communicate with the upper channel 411, and the second end of the valve body 441 extends into the lower channel 412.

[0037] Further, a plurality of pressurizing holes 423 are formed on the outer circumferential wall surface of the piston block 420, and a sealing strip 424 is arranged on the outer circumferential wall surface of the piston block 420, the sealing strip 424 is installed on the piston block 420 by an elastic band 425, and abuts against the pressurizing holes 423.

[0038] When the movement of the sampling assembly 400 is in the first stroke, the piston rod 430 is pushed to move along the first direction to the side close to the pipeline 100, at this time, the pressure difference between the upper channel 411 and the lower channel 412 is not enough to make the first one-way valve 440 open, the piston rod 430 will push the piston block 420 to slide in the sampling channel 410 by the clamping block 422, and the resistance of the upper channel 411 is not enough to make the clamping block 422 deform and make the piston rod 430 slide in the piston block 420.

[0039] When the movement of the sampling assembly 400 is in the third stroke, since the piston block 420 is filled with liquid on the side close to the pipeline 100 in the first direction (the part of the upper channel 411 composed of the sampling cylinder 300), and the piston block 420 moves to abut against the inner wall surface of the sampling cylinder 300 on the side away from the pipeline 100 in the first direction. At this time, if the piston rod 430 wants to extend into the sampling cylinder 300 again, the piston rod 430 needs to occupy the volume in the sampling cylinder 300, since the liquid volume in the sampling cylinder 300 cannot be compressed at this time, under the action of the liquid resistance, the piston rod 430 will extrude the clamping block 422 and move in the sliding cavity 421 of the piston block 420, leaving space for the piston rod 430 to move. While the piston rod 430 moves, the pressure difference between the upper channel 411 and the lower channel 412 is enough to make the first one-way valve 440 open, connecting the upper channel 411 and the lower channel 412, and the liquid in the upper channel 411 will enter the lower channel 412.

[0040] When the piston block 420 moves to extrude the clamping block 422 in the sliding cavity 421, the pressure in the sliding cavity 421 will increase, and the elastic band 425 will be pressed by the pressurizing hole 423, the elastic band 425 will apply pressure to the sealing strip 424, the pressure between the sealing strip 424 and the inner wall of the sampling cylinder 300 will increase, the sealing performance will be enhanced, and when all the liquid in the upper channel 411 enters the lower channel 412, the sealing effect between the sealing strip 424 and the inner wall of the sampling cylinder 300 reaches the best, further avoiding the liquid sample from being polluted by contacting the outside, and facilitating the transportation and storage of the liquid sample.

[0041] In a further embodiment, the ball valve 200 comprises a ball shell 210, a ball body 220 and a knob 230, the ball shell 210 penetrates through in a first direction and is connected with the pipeline 100 through a flange, the ball body 220 is rotatably installed in the ball shell 210, and a channel 221 allowing liquid to flow through is formed in the ball body 220. When the ball valve 200 is opened, the channel 221 and the sampling cylinder 300 form a sampling channel 410. The knob 230 is connected with the ball body 220, and the knob 230 is used to drive the ball body 220 to rotate in the ball shell 210, so that the ball valve 200 is switched between opening and closing. In the initial state, the ball body 220 abuts against the piston block 420.

[0042] In the initial state, the piston block 420 can abut against the ball body 220, and the piston block 420 is arc-shaped on the side close to the pipeline 100 in the first direction.

[0043] Alternatively, the piston block 420 is flat on the side close to the pipeline 100 in the first direction, the ball body 220 is provided with an end face for abutting against the piston block 420, the end face is flat, and the end face is coaxially arranged with the channel 221, so that the piston block 420 can abut against the ball body 220 in the initial state.

[0044] Further, the sampling cylinder 300 is provided with a second one-way valve 450, the second one-way valve 450 is located at the connection between the ball body 220 of the ball valve 200 and the piston block 420, the second one-way valve 450 only allows the gas outside to enter between the ball body 220 of the ball valve 200 and the piston block 420, and the second one-way valve 450 is connected with a nitrogen cylinder.

[0045] By making the piston block 420 abut against the ball body 220 in the initial state, there is little air remaining between the piston block 420 and the ball body 220 in the initial state. After the sampling assembly 400 moves through the third stroke, the piston block 420 abuts against the ball body 220 again at this time, although most of the liquid is sent from the upper channel 411 to the lower channel 412, but there is still a small amount of liquid remaining between the valve ball 442 and the valve body 441 of the first one-way valve 440.

[0046] At this time, the piston rod 430 can be continuously pushed to move the piston rod 430 in the sliding cavity 421 of the piston block 420, so that the liquid in the lower channel 412 is in a negative pressure state, and the second one-way valve 450 can supplement air to the connection between the ball valve 200 and the piston block 420, so that the air pressure at the connection is not lower than the normal pressure, and a small amount of liquid remaining between the valve ball 442 and the valve body 441 of the first one-way valve 440 can be smoothly sucked into the lower channel 412, further avoiding the remaining of the liquid sample, improving the integrity of the sampling, and reducing the waste of the liquid sample in the whole sampling process.

[0047] In combination with the above embodiment, the specific working process is as follows: When it is necessary to sample the liquid in the pipeline 100, the ball valve 200 is rotated to an open state, at which time the sampling channel 410 is in communication with the pipeline 100, and the valve 330 is closed.

[0048] Then the piston rod 430 is pushed to move to the side close to the pipeline 100 in the first direction, so that the gas in the upper channel 411 is pushed to the pipeline 100, at which time the pressure difference between the upper channel 411 and the lower channel 412 is not enough to open the first one-way valve 440, the piston rod 430 will push the piston block 420 to slide in the sampling channel 410 through the clamping block 422, and the resistance of the upper channel 411 is not enough to deform the clamping block 422 and make the piston rod 430 slide in the piston block 420. The movement of the sampling assembly 400 is in the first stroke.

[0049] Then the ball valve 200 is kept in the open state, and the piston rod 430 is pulled to move to the side away from the pipeline 100 in the first direction, so that the piston rod 430 pulls the piston block 420 to slide in the sampling channel 410, and as the piston block 420 moves, the pressure in the upper channel 411 gradually decreases, and the pressure in the pipeline 100 is greater than the pressure in the upper channel 411, so that the liquid in the pipeline 100 can be smoothly sucked into the upper channel 411 under the action of negative pressure, and then even if the pipeline 100 is in a vacuum environment, as the piston block 420 moves, the piston block 420 can also suck the liquid in the pipeline 100 into the upper channel 411. Until the sampling assembly 400 moves to the inner wall surface of the sampling cylinder 300 on the side away from the pipeline 100 in the first direction and abuts against it. In this process, the valve 330 is opened to discharge the gas in the lower channel 412, and then the valve 330 is closed again. The movement of the sampling assembly 400 is in the second stroke.

[0050] Then the ball valve 200 is closed, at this time the liquid originally in the ball valve 200 will be pushed back to the pipeline 100 or continue to stay in the ball valve 200, the pipeline 100 and the sampling cylinder 300 are no longer connected. When the movement of the sampling assembly 400 is in the third stroke, because the piston block 420 is filled with liquid on the side of the pipeline 100 (the part of the upper channel 411 composed of the sampling cylinder 300) in the first direction, and the piston block 420 moves to abut with the inner wall surface of the sampling cylinder 300 on the side of the pipeline 100 away from the first direction. At this time, if the piston rod 430 wants to extend into the sampling cylinder 300 again, the piston rod 430 needs to occupy the volume in the sampling cylinder 300, because the liquid volume in the sampling cylinder 300 at this time cannot be compressed, therefore under the action of the liquid resistance, the piston rod 430 will extrude the clamping block 422 and move in the sliding cavity 421 of the piston block 420, leaving space for the movement of the piston rod 430. While the piston rod 430 moves, the pressure difference between the upper channel 411 and the lower channel 412 is sufficient to make the first one-way valve 440 open, connecting the upper channel 411 and the lower channel 412, and the liquid in the upper channel 411 will enter the lower channel 412.

[0051] At this time, the sampling assembly 400 is located on the side of the pipeline 100 close to the liquid in the first direction, and the liquid sample is temporarily sealed in the sampling cylinder 300 by the sealing arrangement between the sampling assembly 400 and the sampling cylinder 300, avoiding the sample from being contaminated by contacting with the outside world, facilitating the transportation and storage of the liquid sample. Then the liquid sample can be transported.

[0052] In the next use, after opening the ball valve 200, the sampling assembly 400 is pushed to move in the first direction to the side close to the pipeline 100 in the sampling channel 410, the residual liquid in the upper channel 411 is pushed back to the pipeline 100, and the above operation is repeated to sample again.

[0053] The above only describes the preferred embodiments of the present application and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A quantitative sampling valve for a liquid flow pipeline, used for sampling liquid within the pipeline, characterized in that: The system includes a ball valve, a sampling cylinder, and a sampling assembly. The sampling cylinder is connected to a pipeline via the ball valve. The sampling cylinder is arranged radially along the pipeline, and this arrangement is referred to as the first direction. Initially, the ball valve is closed. When the ball valve is open, it connects the pipeline and the sampling cylinder, forming a sampling channel between them. This sampling channel is arranged along the first direction. The sampling assembly is movably installed within the sampling channel along the first direction and slides in a seal with the sampling channel. The sampling assembly divides the sampling channel into an upper channel and a lower channel. The upper channel is located on the side of the lower channel closer to the pipeline in the first direction. Moving the sampling assembly along the first direction allows the upper channel to connect with the lower channel. The sampling assembly moves in three phases: a first phase, a second phase, and a third phase. In the first phase, the ball valve opens, and the sampling assembly moves in a first direction toward the side closer to the pipe, isolating the upper and lower channels, allowing gas or liquid in the upper channel to flow into the pipe. In the second phase, the ball valve opens, and the sampling assembly moves in the first direction away from the pipe, isolating the upper and lower channels, allowing liquid in the pipe to enter the upper channel. In the third phase, the ball valve closes, and the sampling assembly moves in the first direction toward the side closer to the pipe, connecting the upper and lower channels, allowing liquid in the upper channel to enter the lower channel.

2. The quantitative sampling valve for a liquid flow pipeline according to claim 1, characterized in that: The sampling tube is detachably connected to the ball valve via a quick-connect coupling.

3. The quantitative sampling valve for a liquid flow pipeline according to claim 1, characterized in that: The sampling tube has a discharge port on the side away from the pipeline in the first direction, and a valve is installed on the discharge port.

4. The quantitative sampling valve for a liquid flow pipeline according to claim 1, characterized in that: The sampling assembly includes a piston block and a piston rod; the piston block is installed in the sampling channel and slides and seals with the sampling channel; a sliding cavity is provided on the piston block, and a locking block is provided in the sliding cavity. The locking block is an arc-shaped block and has elasticity. The end of the piston rod near the pipe in the first direction can be slidably installed in the sliding cavity in the first direction, and the end of the piston rod away from the pipe in the first direction extends out of the sampling cylinder and slides and seals with the sampling cylinder; and in the initial state, the piston rod is located on the side of the locking block away from the pipe in the first direction.

5. A quantitative sampling valve for a liquid flow pipeline according to claim 4, characterized in that: The sampling assembly also includes a first check valve, which is disposed on the piston block along a first direction and allows liquid in the upper channel to enter the lower channel only.

6. A quantitative sampling valve for a liquid flow pipeline according to claim 5, characterized in that: The first one-way valve includes a valve body and a valve ball; the valve body is arranged along a first direction and passes through the first direction, the valve ball is connected to the valve body through a first elastic element, and the two ends of the valve body in the first direction are respectively referred to as the first end and the second end. In the initial state, the valve ball blocks the first end; the first end of the valve body can communicate with the upper channel, and the second end of the valve body extends into the lower channel.

7. A quantitative sampling valve for a liquid flow pipeline according to claim 4, characterized in that: Multiple pressure holes are provided on the outer peripheral wall of the piston block, and a sealing strip is also provided on the outer peripheral wall of the piston block. The sealing strip is installed on the piston block by an elastic band and abuts against the pressure holes.

8. A quantitative sampling valve for a liquid flow pipeline according to claim 4, characterized in that: The ball valve includes a ball shell, a ball, and a knob. The ball shell is through in the first direction and connected to a pipeline. The ball is rotatably installed inside the ball shell and has a channel on the ball that allows liquid to flow. The knob is connected to the ball and is used to drive the ball to rotate inside the ball shell, so that the ball valve can be switched between open and closed. In the initial state, the ball is in contact with the piston block.

9. A quantitative sampling valve for a liquid flow pipeline according to claim 8, characterized in that: The sampling cylinder is equipped with a second one-way valve, which is located at the connection between the ball and the piston block. The second one-way valve only allows external gas to enter between the ball and the piston block.

10. A quantitative sampling valve for a liquid flow pipeline according to claim 1, characterized in that: A heat insulation cylinder is fitted onto the sampling cylinder.

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