Liquid pipeline sampling device

Abstract

The present invention belongs to the technical field of nuclear power operation and maintenance, and in particular, relates to a liquid pipeline sampling device. The present invention, by providing a three-way valve, a soft sealing block unit, a hole block unit, and a positioning column unit, plays a technical effect of facilitating sampling and testing in the cooling water pipeline of a nuclear power plant, and can quickly and conveniently replace the soft sealing block unit after the liquid tightness is reduced. The present invention has the following advantages: the characteristic of the soft sealing block that it can still maintain a liquid-tight effect after being pierced by a needle and then pulled out is used as a sealing component in the sampling device; a lifting block with an eccentric hole is provided under the soft sealing block, and after sampling, the eccentric hole can be staggered with the liquid-tight hole on the soft sealing block by rotating and staggering, and the lifting block forms a liquid-tight layer with the soft sealing block by the upward lifting effect, further preventing the liquid from flowing out, and the eccentric hole and the liquid-tight hole can be realigned by the positioning column during secondary sampling for sampling; the positioning column can be retained at the three-way valve port after being pulled out.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power operation and maintenance, and in particular relates to a liquid pipeline sampling device. Background Art

[0002] During the power operation of a pressurized water reactor nuclear power plant, the radiation decomposition of the primary coolant produces oxygen, which is the main cause of corrosion of the primary circuit structural materials and equipment. In order to inhibit the radiation decomposition of water, hydrogen is usually added to the primary circuit, and the dissolved hydrogen content in the coolant is generally controlled at 25-50cc / kg. Most pressurized water reactor units use a thermal conductivity online dissolved hydrogen meter to monitor the dissolved hydrogen content in the primary circuit in real time. The B-10 neutron reaction in the reactor will produce a large number of alpha particles, which will become helium after gaining electrons. Since the thermal conductivity coefficients of helium and hydrogen are similar, they will interfere with the measurement results of the thermal conductivity online dissolved hydrogen meter, making the measured value higher. Before the unit is shut down and the cover is opened, it is necessary to confirm that the dissolved hydrogen in the primary circuit coolant is less than 5cc / kg. At this time, due to the interference of helium, the measured value of the online dissolved hydrogen meter may be greater than 5cc / kg, and other methods are needed to accurately measure the dissolved hydrogen content in the primary circuit.

[0003] At the same time, during the operation of the reactor power, O-17, N-14 and neutrons react to produce C-14. Studies have shown that C-14 produced by N-14 neutron reaction accounts for about 20% of the total. In order to further reduce the production of C-14 and reduce environmental emissions, it is necessary to control the amount of nitrogen entering the primary coolant, so the nitrogen content in the primary coolant must be accurately measured.

[0004] In order to analyze the content of dissolved gas (dissolved hydrogen, dissolved nitrogen, etc.) in the primary coolant, it is necessary to sample the loop coolant. The Chinese utility model patent with announcement number CN209525936U and announcement date 2019-10-22 discloses a dissolved hydrogen measurement connection device for the main system of a nuclear power plant, including the following components: a connecting hose with a quick connector is connected to a sample thermostat through an opening at the bottom back of a metal box, the sample thermostat is placed in the lower cabinet of the metal box, the outlet of the sample thermostat is connected to a pressure reducing valve with a pressure gauge above through the middle partition of the metal box, the pressure reducing valve with a pressure gauge is connected to a dissolved hydrogen analyzer, the dissolved hydrogen analyzer is connected to the pressure gauge and then to an adjustable flowmeter, the adjustable flowmeter is connected to a connecting hose with a quick connector through the opening at the top back of the metal box, so as to realize the measurement of dissolved hydrogen.

[0005] However, this thermal conductivity dissolved hydrogen table measurement method cannot eliminate the interference of helium, so most of the current measurement methods use the redox dissolved hydrogen table method that can eliminate the interference of helium. However, the disadvantage of this method is that the sampling equipment is complicated and the sampling operation is complicated. In order to solve this problem, a Chinese invention patent with publication number CN101126687A and publication date 2008-02-20 discloses a phase separator, which includes a sampling unit, a vacuum pipeline for evacuating the sampling unit, and a bubbling pipeline for inputting nitrogen or an inert gas into the sampling unit. The sampling unit includes a sampling-separator, a separator that can be connected or disconnected with the sampling-separator is provided below the sampling-separator, and a gas sampling bottle that can be connected or disconnected with the sampling-separator is provided above the sampling-separator. The interior of the separator is divided into two cavities, the upper cavity is an eccentric structure, and the volume of the lower cavity is 100-110% of the volume of the sampling-separator; a bubbling element is provided at the center of the lower cavity of the separator, which can sample the water sample of dissolved gas in the pipeline. However, the utility model has a complex structure and is installed integrally with the sampling pipeline. When the air tightness is damaged, the three-way valve needs to be directly replaced, and maintenance is very difficult.

[0006] Therefore, in summary, there is an urgent need for a sampling device that can be used to conveniently take samples and detect in the cooling water pipeline of a nuclear power plant, and the liquid-tight components therein can be conveniently replaced when the liquid-tightness of the device is reduced. Summary of the invention

[0007] The purpose of the present invention is to provide a liquid pipeline sampling device. The present invention is provided with a three-way valve on the liquid pipeline, and also includes a soft sealing block unit provided on the three-way valve and capable of being inserted by a syringe for sampling, a perforated block unit provided on the inner side of the water outlet of the three-way valve and capable of being inserted by a syringe and used to push the soft sealing block unit inward, and a positioning column unit provided on the inner side of the water outlet of the three-way valve and capable of pushing the perforated block unit inward and resetting the perforated block unit and the existing hole on the soft sealing block unit for secondary sampling. The present invention has the technical effect of facilitating sampling and testing in the cooling water pipeline of a nuclear power plant, and enabling rapid and convenient replacement of the soft sealing block unit after the liquid tightness of the soft sealing block unit is reduced.

[0008] The technical solution adopted by the present invention to solve the above-mentioned problem is: a liquid pipeline sampling device, including a three-way valve arranged on the liquid pipeline, and also including a soft sealing block unit arranged on the three-way valve and capable of being penetrated by a syringe for sampling, a perforated block unit arranged on the inner side surface of the water outlet of the three-way valve, capable of being penetrated by a syringe and used to push the soft sealing block unit inward, and a positioning column unit arranged on the inner side surface of the water outlet of the three-way valve, capable of being pushed inward by a syringe and used to reset the existing holes on the perforated block unit and the soft sealing block unit for secondary sampling.

[0009] A further preferred technical solution is that: the soft sealing block unit includes a soft sealing block arranged on the inner side of the three-way valve outlet; the perforated block unit includes an internal threaded ring arranged on the inner side of the three-way valve outlet, an external threaded column screwed on the internal threaded ring and used to lift the soft sealing block upward, and an eccentric hole arranged on the external threaded column.

[0010] A further preferred technical solution is that: the soft sealing block unit also includes a lower support block arranged on the inner side of the water outlet of the three-way valve and used to support the soft sealing block; the perforated block unit also includes a lifting column arranged on the external threaded column and engaged between the lower support blocks, and the eccentric hole passes through the external threaded column and the lifting column.

[0011] A further preferred technical solution is that: the perforated block unit also includes a first positioning groove arranged on the lower bottom surface of the external threaded column; the positioning column unit includes a second positioning groove arranged on the three-way valve, a first positioning column for inserting into the first positioning groove, a second positioning column for inserting into the second positioning groove, and a horizontal positioning column arranged on the first positioning column and used to connect the second positioning column so that the first positioning groove and the second positioning groove are aligned.

[0012] A further preferred technical solution is that the soft sealing block unit also includes an upper clamping block which is arranged on the inner side of the water outlet of the three-way valve and is used to cooperate with the lower supporting block to clamp the soft sealing block.

[0013] A further preferred technical solution is that the positioning column unit further includes a vertical sliding groove arranged on the inner side of the second positioning groove, and a sliding block arranged on the second positioning column and used for inserting into the vertical sliding groove.

[0014] A further preferred technical solution is that: the positioning column unit further includes an arc-shaped sliding groove provided on the inner side surfaces of the second positioning groove and the vertical sliding groove and used for engaging the sliding block.

[0015] A further preferred technical solution is that the positioning column unit further includes a stop block arranged on the inner side of the second positioning groove, and a protruding block arranged on the second positioning column and used to lift up the stop block.

[0016] A further preferred technical solution is that: the positioning column unit further includes a spring which is sleeved on the second positioning column and is used to lift up the stop block and the protruding block.

[0017] A further preferred technical solution is that the hole block unit also includes a rotating block arranged on the external thread column.

[0018] The present invention has the following advantages:

[0019] First, the soft sealing block is used as a sealing component in the sampling device, which has the property of maintaining a liquid-tight effect after being inserted by a needle and then pulled out. The structure is simple and practical, and it is convenient to replace the component in time after the liquid-tight effect is reduced.

[0020] Second, a lifting block with an eccentric hole is arranged under the soft sealing block. After sampling, the eccentric hole can be staggered with the liquid-tight hole on the soft sealing block by rotating and staggering, and the lifting block forms a liquid-tight layer with the soft sealing block by the upward lifting effect, thereby further preventing the liquid from flowing out.

[0021] Third, during secondary sampling, the eccentric hole and the liquid-tight hole can be realigned for sampling through the positioning column, which reduces the degree of damage to the structure of the soft sealing block and increases its service life.

[0022] Fourthly, the positioning column can be retained at the three-way valve port by pulling down and rotating in a non-positioning state, so as to facilitate the next use and avoid being abandoned during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the position of the three-way valve in the liquid pipeline and the sampling position of the syringe in the three-way valve in the present invention.

[0024] Figure 2 It is a schematic diagram of the installation positions of the soft sealing block unit, the hole block unit and the positioning column unit in the three-way valve, and the structure of the hole block unit in a state ready for sampling.

[0025] Figure 3 It is a structural schematic diagram of the hole block unit in the present invention in a state after sampling and cooperating with the soft sealing block unit to close the liquid outflow channel.

[0026] Figure 4 It is a structural schematic diagram of the positioning column unit in the present invention in a positioning state.

[0027] Figure 5 It is a structural schematic diagram of the positioning column unit in the present invention in an idle state.

[0028] Figure 6 It is a structural schematic diagram of the installation position of the arc-shaped sliding groove in the present invention.

[0029] In the accompanying drawings, the components represented by each reference numeral are as follows: liquid pipeline A, syringe B, liquid-tight hole C, three-way valve 11, soft sealing block unit 1, hole block unit 2, positioning column unit 3, soft sealing block 101, lower support block 102, upper clamping block 103, internal thread ring 201, external thread column 202, eccentric hole 203, lifting column 204, first positioning groove 205, second positioning groove 301, first positioning column 302, second positioning column 303, horizontal positioning column 304, vertical sliding groove 305, sliding block 306, arc sliding groove 307, stop block 308, protruding block 309, spring 310, rotating block 311. DETAILED DESCRIPTION

[0030] The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention.

[0031] Example: As shown in the attached Figure 1-6 As shown, a liquid pipeline sampling device includes a three-way valve 11 arranged on a liquid pipeline A, and also includes a soft sealing block unit 1 arranged on the three-way valve 11 and capable of being penetrated by a syringe B for sampling, a hole block unit 2 arranged on the inner side surface of a water outlet of the three-way valve 11, capable of being penetrated by a syringe B and used to push up the soft sealing block unit 1 inwardly, and a positioning column unit 3 arranged on the inner side surface of the water outlet of the three-way valve 11, capable of being pushed up by a syringe B and used to push up the hole block unit 2 inwardly and reset the hole block unit 2 and the existing hole on the soft sealing block unit 1 for secondary sampling.

[0032] In this embodiment, the "liquid pipeline A" refers to the pipeline used to transport a circuit coolant, the "water outlet" refers to the opening of the three-way valve that is not connected to the liquid pipeline A, which can be used for sampling operations, and the "pushing inward" refers to pushing up along the water outlet toward the liquid.

[0033] The specific operation steps of this embodiment are as follows: first, insert the syringe B into the hole of the perforated block unit 2 into the soft sealing block unit 1 to sample the coolant; second, after sampling, pull the syringe B out of the hole of the perforated block unit 2, and the self-healing effect of the soft sealing block unit 1 can temporarily prevent the coolant in the liquid pipeline A from flowing out; third, rotate the perforated block unit 2 so that its pores are offset from the pores pierced by the syringe B on the soft sealing block unit 1, and push it upward so that the pores are offset from the pores pierced by the syringe B. The contact surface of the soft sealing block unit 1 produces a liquid-tight effect, preventing the liquid in the liquid pipeline A from flowing out of the pores of the soft sealing block unit 1; fourth, if you want to take a sample again, the positioning column unit 3 is used to rotate the pores of the perforated block unit 2 to re-dock with the pores previously pierced by the soft sealing block unit 1, so as to facilitate the next insertion of the syringe B and reduce the number of pinholes caused by the syringe B to the soft sealing block unit 1, thereby maintaining the liquid-tight effect of the soft sealing block unit 1.

[0034] Among them, the soft sealing block unit 1 serves as a sealing component in the sampling device. After being pierced by a needle and then pulled out, although a liquid-tight hole C is left, the liquid-tight effect is still maintained. Even if the liquid-tight effect of the soft sealing block unit 1 is reduced after multiple uses, it can still be repaired by replacement, which is convenient and quick.

[0035] The soft sealing block unit 1 includes a soft sealing block 101 arranged on the inner side of the water outlet of the three-way valve 11; the perforated block unit 2 includes an internal threaded ring 201 arranged on the inner side of the water outlet of the three-way valve 11, an external threaded column 202 screwed on the internal threaded ring 201 and used to lift the soft sealing block 101 upward, and an eccentric hole 203 arranged on the external threaded column 202.

[0036] In this embodiment, the soft sealing block 101 is made of silicone material and is inserted into the water outlet of the three-way valve 11 by extrusion. The external thread column 202 is fixed to the water outlet of the three-way valve 11 through the internal thread ring 201, and the soft sealing block 101 is pushed up from the outside to the inside. Figure 2 , 3 As shown, the eccentric hole 203 is arranged at a non-central axis of the external threaded column 202, so that the position of the eccentric hole 203 can be adjusted by rotating the external threaded column 202, and the position of the external threaded column 202 can be raised by rotating the external threaded column 202 to lift the soft sealing block 101.

[0037] The soft sealing block unit 1 also includes a lower support block 102 arranged on the inner side of the water outlet of the three-way valve 11 and used to support the soft sealing block 101; the perforated block unit 2 also includes a lifting column 204 arranged on the external threaded column 202 and engaged between the lower support block 102, and the eccentric hole 203 passes through the external threaded column 202 and the lifting column 204.

[0038] In this embodiment, in order to prevent the liquid in the three-way valve 11 from being lifted up and sliding outward when the soft sealing block 101 is installed, the lower support block 102 is provided at the outlet of the three-way valve 11 to prevent the sliding phenomenon of the soft sealing block 101 when installed. However, the lower support block 102 is separated between the external threaded column 202 and the soft sealing block 101, so the lifting column 204 is provided to fill the gap between the external threaded column 202 and the soft sealing block 101 so that the two remain in a liquid-tight state.

[0039] The perforated block unit 2 also includes a first positioning groove 205 arranged on the lower bottom surface of the external threaded column 202; the positioning column unit 3 includes a second positioning groove 301 arranged on the three-way valve 11, a first positioning column 302 for inserting the first positioning groove 205, a second positioning column 303 for inserting the second positioning groove 301, and a horizontal positioning column 304 arranged on the first positioning column 302 and used to connect the second positioning column 303 so that the first positioning groove 205 and the second positioning groove 301 are aligned.

[0040] In this embodiment, although the liquid-tight hole C pierced by the syringe B in the soft sealing block 101 can prevent the liquid from leaking to a certain extent, the sealing effect is limited. Therefore, in order to be able to reinsert the soft sealing block 101 into the liquid-tight hole C pierced by the syringe B through the eccentric hole 203 when sampling for the second time and thereafter, so that as few liquid-tight holes C as possible appear on the soft sealing block 101 and the leakage-proof effect of the device is improved, the external threaded column 202 can be reset by the positioning column unit 3. The specific operation method is as follows: first, after the liquid-tight hole C is generated by the first piercing of the soft sealing block 101, in order to prevent the liquid from flowing out directly along the eccentric hole 203 through the liquid-tight hole C, the first positioning column 302 is firstly withdrawn from the first positioning groove 205 to release the clamping effect on the external threaded column 202, and then the external threaded column 202 is rotated to make the eccentric hole 203 staggered with the liquid-tight hole C, and the lifting column 204 is made to rotate and rise. The upper surface is lifted up from the lower surface of the soft sealing block 101 to produce a liquid-tight layer. In this way, if water wants to flow out of the three-way valve 11, it must at least pass through the liquid-tight hole C and the liquid-tight layer formed by the lifting column 204 and the soft sealing block 101, so the liquid in the three-way valve 11 will hardly flow out; secondly, if you want to take a sample from the three-way valve 11 again, rotate the external thread column 202 so that the first positioning column 302 can be reinserted into the first positioning groove 205, and the second positioning column 303 can also be inserted into the second positioning groove 301. Since the second positioning groove 301 records the initial position of the external thread column 202, the first positioning groove 205 is aligned with the second positioning groove 301 through the connection of the horizontal positioning column 304, so that the eccentric hole 203 is convenient for aligning the liquid-tight hole C, and the next sampling operation can be performed without leaving a second liquid-tight hole C on the soft sealing block 101.

[0041] The soft sealing block unit 1 further includes an upper clamping block 103 which is arranged on the inner side of the water outlet of the three-way valve 11 and is used to cooperate with the lower supporting block 102 to clamp the soft sealing block 101 .

[0042] In this embodiment, on the one hand, the upper clamping block 103 cooperates with the lower supporting block 102 to clamp and fix the soft sealing block 101 so that it is fixed in the corresponding position during installation; on the other hand, when the external threaded column 202 lifts the soft sealing block 101, the limiting effect of the upper clamping block 103 prevents the soft sealing block 101 from being pushed into the three-way valve 11.

[0043] The positioning column unit 3 further includes a vertical sliding groove 305 disposed on the inner side of the second positioning groove 301 , and a sliding block 306 disposed on the second positioning column 303 and used for inserting into the vertical sliding groove 305 .

[0044] In this embodiment, the sliding block 306 is used to fix the position of the second positioning column 303, so that the second positioning column 303 can only move up and down in the second positioning groove 301 without rotating. In this way, the first positioning groove 205 can be more accurately aligned with the second positioning groove 301 during the repositioning process.

[0045] The positioning column unit 3 further includes an arc-shaped sliding groove 307 which is arranged on the inner side of the second positioning groove 301 and the vertical sliding groove 305 and is used for engaging the sliding block 306 .

[0046] In this embodiment, in order to ensure that the second positioning column 303 is still suspended in the second positioning groove 301 after the first positioning column 302 is removed from the first positioning groove 205, and can be turned to the side to avoid blocking the rotation process of the internal thread ring 201, the arc-shaped sliding groove 307 is provided. When the second positioning column 303 moves downward, the sliding block 306 and the arc-shaped sliding groove 307 are aligned, and finally the sliding block 306 is engaged into the arc-shaped sliding groove 307 through the rotation action, so that the first positioning column 302 is turned to the side to avoid blocking the rotation process of the internal thread ring 201.

[0047] The positioning column unit 3 further includes a stop block 308 disposed on the inner side of the second positioning groove 301 , and a protruding block 309 disposed on the second positioning column 303 and used to lift up the stop block 308 .

[0048] In this embodiment, the protruding block 309 is engaged with the stopping block 308 when the second positioning column 303 moves downward, so that the second positioning column 303 will not drop indefinitely and thus be separated from the second positioning groove 301 .

[0049] The positioning column unit 3 further includes a spring 310 which is sleeved on the second positioning column 303 and is used to lift up the stop block 308 and the protruding block 309 .

[0050] In this embodiment, in order to enable the first positioning column 302 to automatically insert into the first positioning groove 205 when moving to the specified position, the spring 310 is provided on the stop block 308 and the protruding block 309. In this way, the second positioning column 303 is pushed into the depth of the second positioning groove 301 by the protruding block 309 in a natural state without force. Driven by the horizontal positioning column 304, the first positioning column 302 simultaneously enters the first positioning groove 205 to complete the positioning engagement.

[0051] The perforated block unit 2 further includes a rotating block 311 disposed on the external threaded column 202 .

[0052] In this embodiment, directly rotating the external thread column 202 will be restricted by the first positioning column 302, and it is inconvenient to apply force during rotation. Therefore, a rotating block 311 that continues to extend downward is provided on the lower bottom surface of the external thread column 202. When the external thread column 202 needs to be rotated, it can be achieved by simply moving the rotating block 311.

[0053] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various modifications can be made within the knowledge of ordinary technicians in the technical field without departing from the purpose of the present invention. These are all non-creative modifications and are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A liquid pipeline sampling device, comprising a three-way valve (11) arranged on a liquid pipeline (A), characterized in that: The invention also comprises a soft sealing block unit (1) arranged on the three-way valve (11) and capable of being penetrated by a syringe (B) for sampling, a hole block unit (2) arranged on the inner side of the water outlet of the three-way valve (11) and capable of being penetrated by a syringe (B) and used to push the soft sealing block unit (1) inwardly, and a positioning column unit (3) arranged on the inner side of the water outlet of the three-way valve (11) and capable of being penetrated by a syringe (B) for pushing the hole block unit (2) inwardly and used to reset the hole block unit (2) and the existing hole on the soft sealing block unit (1) for secondary sampling; the soft sealing block unit (1) comprises a soft sealing block (101) arranged on the inner side of the water outlet of the three-way valve (11); the hole block unit (2) comprises an internal threaded ring (201) arranged on the inner side of the water outlet of the three-way valve (11) and screwed onto the internal threaded ring (201) The invention relates to a three-way valve (11) having an outer threaded column (202) on the grooved ring (201) and used for lifting the soft sealing block (101) upwards, and an eccentric hole (203) arranged on the outer threaded column (202); the hole block unit (2) also includes a first positioning groove (205) arranged on the bottom surface of the outer threaded column (202); the positioning column unit (3) includes a second positioning groove (301) arranged on the three-way valve (11), a first positioning column (302) for inserting the first positioning groove (205), a second positioning column (303) for inserting the second positioning groove (301), and a horizontal positioning column (304) arranged on the first positioning column (302) and used for connecting the second positioning column (303) so that the first positioning groove (205) and the second positioning groove (301) are aligned.

2. A liquid pipeline sampling device according to claim 1, characterized in that: The soft sealing block unit (1) further comprises a lower support block (102) arranged on the inner side of the water outlet of the three-way valve (11) and used to support the soft sealing block (101); the hole block unit (2) further comprises a jacking column (204) arranged on the external threaded column (202) and engaged between the lower support block (102), and the eccentric hole (203) passes through the external threaded column (202) and the jacking column (204).

3. A liquid pipeline sampling device according to claim 2, characterized in that: The soft sealing block unit (1) further comprises an upper clamping block (103) which is arranged on the inner side of the water outlet of the three-way valve (11) and is used to cooperate with the lower supporting block (102) to clamp the soft sealing block (101).

4. A liquid pipeline sampling device according to claim 1, characterized in that: The positioning column unit (3) further comprises a vertical sliding groove (305) arranged on the inner side of the second positioning groove (301), and a sliding block (306) arranged on the second positioning column (303) and used for inserting into the vertical sliding groove (305).

5. A liquid pipeline sampling device according to claim 4, characterized in that: The positioning column unit (3) further comprises an arc-shaped sliding groove (307) which is arranged on the inner side surfaces of the second positioning groove (301) and the vertical sliding groove (305) and is used for engaging the sliding block (306).

6. A liquid pipeline sampling device according to claim 1, characterized in that: The positioning column unit (3) further comprises a stop block (308) arranged on the inner side of the second positioning groove (301), and a protruding block (309) arranged on the second positioning column (303) and used to lift the stop block (308).

7. A liquid pipeline sampling device according to claim 6, characterized in that: The positioning column unit (3) further comprises a spring (310) which is sleeved on the second positioning column (303) and is used to lift up the stop block (308) and the protruding block (309).

8. A liquid pipeline sampling device according to claim 6, characterized in that: The hole block unit (2) further comprises a rotating block (311) arranged on the external thread column (202).

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