CN219200994U - External sampler of pipeline - Google Patents

Abstract

The utility model relates to a sampling technology's field especially relates to an external sampler of pipeline, including flow control valve, advance the appearance pipe, the back flow, go out the appearance pipe, first three-way valve and collection device, flow control valve sets up on waiting the sample pipeline, advance appearance pipe, back flow and go out the appearance pipe and be connected with first three-way valve, advance the appearance pipe, the back flow is kept away from the one end of first three-way valve and is connected and junction is located the both sides of flow control valve respectively through dismantling the connecting piece with waiting the sample pipeline, go out the appearance pipe and can dismantle with collection device and be connected. After sampling, the collecting device is disassembled, so that the collecting device is conveniently cleaned, the sampling pipe and the return pipe are disassembled after sampling, and meanwhile, the first three-way valve is disassembled and cleaned and maintained, so that the service life of the first three-way valve is effectively prolonged.

Description

External sampler of pipeline

Technical Field

The application relates to the field of sampling technology, in particular to an external sampler for a pipeline.

Background

In a chemical plant, it is generally necessary to sample and examine a fluid product in a transport pipeline, and when sampling in the pipeline, vacuum sampling and hermetic sampling are required because some products have properties such as volatility, toxicity, being unable to contact water or air, being gaseous at normal temperature and pressure, and the like.

The utility model discloses a pipeline sampling device, which comprises a main pipe, a first branch pipe, a three-way valve, a second branch pipe and a third branch pipe, wherein the main pipe is provided with a liquid inlet end and a liquid outlet end, the first branch pipe is connected with the main pipe, the three-way valve is provided with an inlet, a first outlet and a second outlet, the three-way valve can realize that the inlet is communicated with the first outlet or the inlet is communicated with the second outlet, the inlet is connected with the first branch pipe, one end of the second branch pipe is connected with the first outlet, the other end of the second branch pipe is connected with the main pipe, the connection position of the second branch pipe and the main pipe is closer to the liquid outlet end than the connection position of the first branch pipe and the main pipe, one end of the third branch pipe is connected with the second outlet, and the other end of the third branch pipe is connected with a sampling bottle. The sampling personnel do not need to discharge liquid, so that the environmental pollution of a sampling site is avoided.

The utility model can solve the problems of airtight sampling of liquid samples and no need of discharging accumulated liquid, but after the sampling is finished, the sampling part is difficult to clean because the fixed sampling device is difficult to disassemble.

Disclosure of Invention

In order to solve the problem of inconvenient cleaning of sampling components, the application provides an external sampler of pipeline.

The application provides an external sampler of pipeline adopts following technical scheme:

the utility model provides an external sampler of pipeline, includes flow control valve, advance the appearance pipe, back flow, go out appearance pipe, first three-way valve and collection device, flow control valve sets up on waiting the sample pipeline, advance the appearance pipe the back flow and go out the appearance pipe with first three-way valve is connected, advance the appearance pipe the back flow is kept away from one end of first three-way valve is connected and junction punishment is located through detachable connection spare with waiting the sample pipeline the both sides of flow control valve, go out the appearance pipe with collection device can dismantle the connection.

Through adopting above-mentioned technical scheme, dismantle collection device after getting the appearance, and then be convenient for clear up collection device, advance the pipe, dismantle after the sample is accomplished to the back flow, dismantle and clear up the maintenance with first three-way valve simultaneously, improved first three-way valve's life effectively.

Optionally, the detachable connector includes that public head is connected to the double closed type and female head is connected to the double closed type, the public head is provided with two and is used for setting up on waiting to take a sample the pipeline to double closed type, female head is connected to the double closed type be provided with two and set up respectively in advance the pipe the back flow is kept away from the tip of first three-way valve, through the female head is connected to the double closed type with the public head is connected to the double closed type realizes advance the sample tube with wait to take a sample the back flow with wait to take a sample the detachable connection of pipe.

By adopting the technical scheme, the double-closed type connecting male head is arranged on a pipeline to be sampled, the double-closed type connecting female head is arranged on the sample inlet pipe and the return pipe, and the double-closed type connecting female head is sleeved at the end part of the double-closed type connecting male head during connection, so that the connection is closed and reliable; after the sampling is finished, the double-closed type connecting male head and the double-closed type connecting female head are separated, and the double-closed type connecting female head is detached along with the sample inlet pipe and the return pipe, so that the disassembly is convenient and quick.

Optionally, the double-closed type connecting male head is tubular and one end of the double-closed type connecting male head is connected to the pipeline to be sampled, a first pressing block is installed in the double-closed type connecting male head through a first spring, the first spring is located between the first pressing block and the pipeline to be sampled, a first sealing step is arranged on the inner side wall of the double-closed type connecting male head and is located at one side, far away from the first spring, of the first pressing block, the surface of the first sealing step is attached to the surface, far away from the first spring, of the first pressing block, and one end, far away from the first spring, of the first pressing block is provided with a first pressing rod in a protruding mode;

the double-closed type connecting female head is tubular, one end of the double-closed type connecting female head is connected with the sample injection pipe and the return pipe, a second pressing block is installed in the double-closed type connecting female head through a second spring, the second spring is located at one side, far away from the double-closed type connecting male head, of the second pressing block, a second sealing step is arranged on the inner side wall of the double-closed type connecting female head, the second sealing step is located at one side, far away from the second spring, of the second pressing block, the surface of the second sealing step is attached to the surface, far away from the second spring, of the second pressing block, and one end, far away from the second spring, of the second pressing block is provided with a first pressing rod in a protruding mode;

when the double-closed type connecting male head is connected with the double-closed type connecting female head, the double-closed type connecting female head end is sleeved at the double-closed type connecting male head end and fixed through a positioning mechanism.

Through adopting above-mentioned technical scheme, when the public head of double closed type connection and the female head of double closed type connection are separated: the first pressing block is pressed against the surface of the first sealing step by the first spring, so that fluid in the pipeline to be sampled is not easy to flow out of the male head; the second spring presses the second pressing block against the surface of the second sealing step, so that the ends of the sample inlet pipe and the return pipe are closed; when the double-closed type connecting male head is connected with the double-closed type connecting female head: the first compression bar and the second compression bar are mutually extruded, so that the first compression block is separated from the first sealing step, the second compression block is separated from the second sealing step, fluid to be tested is taken out from the pipeline to be sampled and collected, the positions of the double-closed type connecting male head and the double-closed type connecting female head are fixed through the positioning mechanism, and the possibility that the fluid leaks from the connecting position during sampling is reduced.

Optionally, the positioning ring groove has been seted up to circumference on the public first lateral wall of dual closed type connection, circumference evenly distributed has a plurality of mounting grooves just on the lateral wall of the female head of dual closed type connection the mounting groove will the lateral wall of female head of dual closed type connection runs through, positioning mechanism includes a plurality of location steel balls, a plurality of location steel balls with a plurality of mounting groove one-to-one and install in the mounting groove, the diameter of location steel balls is greater than the diameter of mounting groove, just the location steel balls are located outside the female head of dual closed type connection, positioning mechanism is still including being used for with the location steel balls support tightly support tight piece in the positioning ring groove.

Through adopting above-mentioned technical scheme, the location steel ball is in the locating ring inslot under the effect of supporting the tight piece joint, has hindered the relative slip between the public head of double closed type connection and the female head of double closed type connection, has reduced the possibility that fluid revealed.

Optionally, the tight piece is including sliding the cover and establish the shell on the female head of dual closed type connection, the protrusion is provided with on the inside wall of shell and is used for with the location steel ball is impressed support the ring in the positioning ring groove, just be provided with on the female head of dual closed type connection and be used for the location the locating part of shell position.

By adopting the technical scheme, when the double-closed type connecting male head and the double-closed type connecting female head are connected, the shell slides to a designated position and is limited and fixed through the limiting piece, and the supporting ring supports the positioning steel balls into the positioning ring groove; when the double-closed type connecting male head and the double-closed type connecting female head are separated, the shell is firstly slipped, and then the double-closed type connecting female head is moved to extrude the positioning steel balls out of the positioning ring groove, so that the disassembly is completed, and the operation is convenient and quick.

Optionally, the locating part is in including the protrusion setting convex ring on the female first lateral wall of dual-closure type connection, dual-closure type connection female first overcoat is equipped with the third spring, the third spring both ends respectively with convex ring with support the ring butt, dual-closure type connection female first lateral wall on the cover be equipped with the spacing ring, the spacing ring is located the mounting groove is kept away from one side of convex ring.

By adopting the technical scheme, when the double-closed type connecting male head and the double-closed type connecting female head are connected and in a general state, the third spring pushes the propping ring to the limiting ring, and the propping ring is positioned under the action of the third spring and the limiting ring; when the double-closed type connecting male head and the double-closed type connecting female head are separated, the third spring is compressed, the abutting ring is separated from the positioning steel balls, the disassembly is further completed, the operation process is simple and convenient, and the third spring is matched with the limiting ring, so that the abutting ring is more reliably fixed.

Optionally, the first three-way valve comprises a T-shaped three-way ball valve.

By adopting the technical scheme, the flow path from the sample injection pipe to the return pipe is mainly in a straight line, and part of fluid is led out through the sample outlet pipe, so that the sampling amount can be controlled conveniently.

Optionally, one end that the outlet pipe is kept away from first three-way valve is connected with the second three-way valve, sampling tube and exhaust tube are connected respectively to the other two ports of second three-way valve, the sampling tube keep away from the one end of second three-way valve with collection device is connected, the exhaust tube is connected with the negative pressure source.

By adopting the technical scheme, the air in the pipe and the three-way valve is discharged through the negative pressure source before sampling, so that the pollution of the air to the fluid sample is reduced, and the sample is effectively protected.

Optionally, the collecting device comprises a liquid sampling bottle, and the bottle mouth of the liquid sampling bottle is connected with the outlet of the sampling tube.

Through adopting above-mentioned technical scheme, when waiting to sample fluid and being liquid, select the liquid sample bottle to collect liquid, the collection transportation and the preservation of liquid of more being convenient for of bottle form collection device.

Optionally, the collection device includes gas sampling bag and gas sampling needle, gas sampling needle one end with the exit linkage of sampling tube, the gas sampling needle other end stretches into in the gas sampling bag.

Through adopting above-mentioned technical scheme, when waiting to sample fluid and being gas, select the gas sampling needle cooperation gas sampling bag to collect, through the degree of swelling in order to judge gas sampling volume of observing gas sampling bag, and then be convenient for control gas sampling volume.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the whole part of the sampler can be arranged in a detachable way, so that the parts can be conveniently detached and maintained;

2. different collecting devices are selected according to the fluids in different states, so that quantitative collection of samples is facilitated, and the application range of the sampler is widened;

3. the sampler is subjected to air extraction treatment before use, so that the possibility of air pollution to the sample is reduced.

Drawings

FIG. 1 is a schematic view of the connection structure of the present application, in which arrows indicate the flow direction of fluid in the pipe to be sampled.

Fig. 2 is a structural cross-sectional view of the dual closure type connection male of the present application.

Fig. 3 is a structural cross-sectional view of the double-closed connection female of the present application.

Fig. 4 is a structural cross-sectional view of a liquid sampling bottle of the present application.

Fig. 5 is a structural cross-sectional view of a liquid sampling needle of the present application.

Reference numerals: 1. a pipe to be sampled; 11. a flow regulating valve; 12. a detachable connection; 21. a sample inlet tube; 22. a return pipe; 23. a first three-way valve; 24. a sampling tube; 25. a second three-way valve; 26. an exhaust pipe; 27. a negative pressure source; 28. a sampling tube; 3. a double-closed connecting male head; 31. a first movable sleeve; 32. a first spring; 33. a first briquette; 34. a first gasket; 35. a first sealing step; 36. a first compression bar; 4. the double-closed type connecting female head; 41. a second movable sleeve; 42. a second spring; 43. a second briquetting; 44. a second gasket; 45. a second sealing step; 46. a second compression bar; 5. a positioning mechanism; 51. positioning ring grooves; 52. a first guide slope; 53. a mounting groove; 54. positioning steel balls; 55. a tightening member; 551. a housing; 552. a support ring; 553. a second guide slope; 56. a limiting piece; 561. a convex ring; 562. a third spring; 563. a limiting ring; 6. a collecting device; 61. a liquid sampling bottle; 62. a gas sampling bag; 63. a gas sampling needle.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-5.

The embodiment of the application discloses external sampler of pipeline, refer to fig. 1, including fixed mounting on waiting that the flow control valve 11 of sampling pipeline 1, there is sampling tube 21 and back flow 22 along waiting that the flow direction of fluid distributes in the sampling pipeline 1, and sampling tube 21 and back flow 22 are located the both sides of flow control valve 11, and sampling tube 21 one end, back flow 22 one end are all installed on waiting that the sampling pipeline 1 through detachable connection piece 12.

Referring to fig. 1 and 2, the detachable connecting piece 12 comprises a tubular double-closed type connecting male head 3 and a double-closed type connecting female head 4, one end of the double-closed type connecting male head 3 is fixedly connected to a pipeline 1 to be sampled, a first movable sleeve 31 is installed in the double-closed type connecting male head 3, one end of the first movable sleeve 31, which is close to the pipeline 1 to be sampled, is fixed in the double-closed type connecting male head 3, a first pressing block 33 is fixedly installed at the other end of the first movable sleeve 31, a first spring 32 is sleeved on the first sleeve, two ends of the first spring 32 are respectively abutted with the first sleeve and the first pressing block 33, a first sealing step 35 is convexly arranged on the inner side wall of the double-closed type connecting male head 3 and is positioned at one end, which is far away from the first movable sleeve 31, of the table top of the first sealing step 35 is inclined, an inclined surface is arranged at the end, and a first sealing pad 34 is sleeved on the first pressing block 33, and under the action of the first spring 32, the inclined surface of the first pressing block 33 is abutted against the first sealing step 35 and the inclined table top 35;

referring to fig. 1 and 3, one end of the double-closed type connecting female head 4 is fixedly connected to the sample inlet pipe 21 and the return pipe 22, a second movable sleeve 41 is installed in the double-closed type connecting female head 4, one end of the sample inlet pipe 21 and one end of the return pipe 22, which are close to the second movable sleeve 41, are fixed in the double-closed type connecting female head 4, a second pressing block 43 is fixedly installed at the other end of the second movable sleeve 41, a second spring 42 is sleeved on the second sleeve, two ends of the second spring 42 are respectively abutted with the second sleeve and the second pressing block 43, a second sealing step 45 is convexly arranged on the inner side wall of the double-closed type connecting female head 4 and is located at one end, which is far away from the second movable sleeve 41, of the second pressing block 43, an inclined surface is arranged at the end, which is far away from the second sleeve, of the second pressing block 43 is sleeved with a second sealing pad 44, under the general state, the inclined surface of the second pressing block 43 is abutted against the inclined surface of the second sealing step 45, and the second sealing pad 44 is abutted against the inclined surface of the second sealing step 45.

Referring to fig. 2 and 3, a first pressing rod 36 is convexly disposed at one end of the first pressing block 33 far from the first sleeve, a second pressing rod 46 is convexly disposed at one end of the second pressing block 43 far from the second sleeve, when the double-closed type connecting male head 3 and the double-closed type connecting female head 4 are connected, the end part of the double-closed type connecting male head 3 is inserted into the end part of the double-closed type connecting female head 4, the end parts of the first pressing rod 36 and the end part of the second pressing rod 46 are mutually pressed, so that the first pressing block 33 and the first sealing step 35, the second pressing block 43 and the second sealing step 45 are mutually separated, the double-closed type connecting male head 3 and the double-closed type connecting female head 4 are communicated and fluid sampling is carried out, and a positioning mechanism 5 for fixing the relative position between the double-closed type connecting male head 3 and the double-closed type connecting female head 4 is disposed on the double-closed type connecting female head 4.

Referring to fig. 2 and 3, a positioning ring groove 51 is circumferentially formed in the outer side wall of the connection end of the double-closed type connection male head 3, an inclined first guiding inclined surface 52 is arranged in a notch of the positioning ring groove 51, eight mounting grooves 53 are circumferentially distributed in the outer side wall of the connection end of the double-closed type connection female head 4, the mounting grooves 53 penetrate through the side wall of the double-closed type connection female head 4, the positioning mechanism 5 comprises eight positioning steel balls 54, the positioning steel balls 54 are in one-to-one correspondence with the mounting grooves 53 and are inserted in the mounting grooves 53, the diameter of the positioning steel balls 54 is larger than that of the mounting grooves 53, a main body of the positioning steel balls 54 is located on the outer side of the double-closed type connection female head 4, part of the positioning steel balls 54 stretches into the double-closed type connection female head 4, and the positioning mechanism 5 further comprises a abutting piece 55 for abutting part of the positioning steel balls 54 into the double-closed type connection female head 4. When the double-closed type connecting male head 3 and the double-closed type connecting female head 4 are connected, the positioning steel balls 54 are aligned with the positioning ring groove 51, and under the action of the abutting piece 55, the positioning steel balls 54 partially extend into the positioning ring groove 51; when the double-closed type connecting male head 3 and the double-closed type connecting female head 4 are separated, the double-closed type connecting male head 3 is pulled, the first guide inclined surface 52 ejects the positioning steel balls 54 out of the double-closed type connecting female head 4, and detachment and separation are completed.

Referring to fig. 2 and 3, the abutting member 55 includes a housing 551 slidably sleeved on the connection end of the double-closed type connection female head 4, an abutting ring 552 is protruded on the inner side wall of the housing 551, and when the double-closed type connection male head 3 and the double-closed type connection female head 4 are separated, the positioning steel ball 54 protrudes out of the double-closed type connection female head 4, and a part of the positioning steel ball 54 is located between the double-closed type connection female head 4 and the housing 551; when the double-closed type connecting male head 3 and the double-closed type connecting female head 4 are connected, the supporting ring 552 pushes the positioning steel ball 54 into the positioning ring groove 51, and the position of the supporting ring 552 is fixed through the limiting piece 56.

Referring to fig. 2 and 3, the limiting member 56 includes a protruding ring 561 protruding from the outer side wall of the double-closed connection female head 4, the inner side wall of the housing 551 is slidably attached to the outer side wall of the protruding ring 561, a third spring 562 is sleeved outside the double-closed connection female head 4, the third spring 562 is located between the housing 551 and the double-closed connection female head 4, two ends of the third spring 562 are respectively abutted to the abutting ring 552 and the protruding ring 561, a limiting ring 563 is fixedly mounted on the outer side of the double-closed connection female head 4, the limiting ring 563 is located on one side, far away from the protruding ring 561, of the mounting groove 53, and a second guiding inclined plane 553 is arranged on the side wall, far away from the protruding ring 561, of the abutting ring 552. When the double-closed type connecting male head 3 is connected with the double-closed type connecting female head 4, the third spring 562 abuts the abutting ring 552 on the limiting ring 563, and at the moment, the abutting ring 552 pushes the positioning steel balls 54 into the positioning ring groove 51 to complete the connection of the double-closed type connecting male head 3 and the double-closed type connecting female head 4; when the double-closed type connecting male head 3 and the double-closed type connecting female head 4 are detached, the shell 551 is pulled to enable the third spring 562 to contract, so that enough space is reserved for the positioning steel balls 54 to move out of the mounting groove 53.

Referring to fig. 1, one end of a sample tube 21, which is far away from a pipeline 1 to be sampled, is connected with a first three-way valve 23, and one end of a return tube 22, which is far away from the pipeline 1 to be sampled, is connected to an interface of the first three-way valve 23, wherein the first three-way valve 23 is a T-shaped three-way ball valve, and a path of fluid flowing from the sample tube 21 to the return tube 22 is a straight line.

Referring to fig. 1, a last interface of the first three-way valve 23 is connected with a sampling tube 24, one end of the sampling tube 24 far away from the first three-way valve 23 is connected with a second three-way valve 25, the other two interfaces of the second three-way valve 25 are respectively connected with an exhaust tube 26 and a sampling tube 28, wherein the exhaust tube 26 is horizontally arranged, the sampling tube 28 is vertically arranged, one end of the exhaust tube 26 far away from the second three-way valve 25 is connected with a negative pressure source 27, and one end of the sampling tube 28 far away from the second three-way valve 25 is detachably connected with a collecting device 6.

Referring to fig. 1 and 4, the collection device 6 includes a liquid sampling bottle 61, the mouth of the liquid sampling bottle 61 being threadedly connected to the end of the sampling tube 28 remote from the second three-way valve 25.

Referring to fig. 1 and 5, the collecting device 6 further includes a gas sampling bag 62 and a gas sampling needle 63, the interface end of the gas sampling needle 63 is in threaded connection with the end of the sampling tube 28 far away from the second three-way valve 25, and the tip of the gas sampling needle 63 extends into the gas sampling bag 62, so that the gas is collected conveniently.

The implementation principle of the external sampler of the pipeline in the embodiment of the application is as follows: according to the state of the fluid to be sampled, a liquid sampling bottle 61 or a gas sampling bag 62 and a gas sampling needle 63 are selected to be used, after the selection is finished, the second three-way valve 25 is adjusted to be communicated with the sampling tube 24, the sampling tube 28 and the exhaust tube 26, the whole sampler is vacuumized through the negative pressure source 27, after the completion, the second three-way valve 25 is adjusted to be communicated with the sampling tube 24 and the sampling tube 28, the first three-way valve 23 is adjusted to be communicated with the sampling tube 21 and the return tube 22, and then the vacuum treatment of the sampler is finished; then, the third spring 562 is compressed by the light-pull shell 551, the double-closed connecting female head 4 is moved to align the double-closed connecting male head 3 and the double-closed connecting female head 4, the double-closed connecting female head 4 is quickly pushed towards the double-closed connecting male head 3, the shell 551 is loosened, the positioning steel balls 54 are pressed into the positioning ring groove 51 by the supporting ring 552, connection installation is further completed, sampling collection is performed, after sampling is completed, the third spring 562 is compressed by the light-pull shell 551, the double-closed connecting female head 4 is quickly pulled out towards the direction deviating from the double-closed connecting male head 3, and disassembly is completed; the collection device 6 is then removed from the sampling tube 28 and the whole is cleaned and dried.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (10)

1. An external sampler of pipeline, its characterized in that: including flow control valve (11), sampling tube (21), back flow (22), play appearance pipe (24), first three-way valve (23) and collection device (6), flow control valve (11) set up on waiting sample pipeline (1), sampling tube (21 back flow (22) and go out appearance pipe (24) with first three-way valve (23) are connected, sampling tube (21) back flow (22) are kept away from one end of first three-way valve (23) is connected and the junction is located respectively with waiting sample pipeline (1) through detachable connection piece (12) the both sides of flow control valve (11), go out appearance pipe (24) with collection device (6) can dismantle the connection.

2. The externally connected sampler for a pipeline according to claim 1, wherein: the detachable connecting piece (12) comprises a double-closed connecting male head (3) and a double-closed connecting female head (4), the double-closed connecting male head (3) is provided with two connecting female heads and is used for being arranged on a sampling pipe (1), the double-closed connecting female head (4) is provided with two connecting female heads and is respectively arranged on the sampling pipe (21), the return pipe (22) is far away from the end part of the first three-way valve (23), and the double-closed connecting female head (4) and the double-closed connecting male head (3) are used for realizing detachable connection of the sampling pipe (21) and the sampling pipe (28) and the return pipe (22) and the sampling pipe (28).

3. The externally connected sampler for a pipeline according to claim 2, wherein: the double-closed type connecting male head (3) is tubular, one end of the double-closed type connecting male head is connected to a pipeline (1) to be sampled, a first pressing block (33) is installed in the double-closed type connecting male head (3) through a first spring (32), the first spring (32) is located between the first pressing block (32) and the pipeline (1) to be sampled, a first sealing step (35) is arranged on the inner side wall of the double-closed type connecting male head (3), the first sealing step (35) is located on one side, far away from the first spring (32), of the first pressing block (33), the surface of the first sealing step (35) is attached to the surface, far away from the first spring (32), of the first pressing block (33), and a first pressing rod (36) is arranged at one end, far away from the first spring (32), of the first pressing block (33) in a protruding mode.

The double-closed type connecting female head (4) is tubular, one end of the double-closed type connecting female head is connected with the sample injection tube (21) and the return tube (22), a second pressing block (43) is installed in the double-closed type connecting female head (4) through a second spring (42), the second spring (42) is located at one side, far away from the double-closed type connecting male head (3), of the second pressing block (43), a second sealing step (45) is arranged on the inner side wall of the double-closed type connecting female head (4), the second sealing step (45) is located at one side, far away from the second spring (42), of the second pressing block (43), the surface of the second sealing step (45) is attached to the surface, far away from the second spring (42), of the second pressing block (43), and one end, far away from the second spring (42), of the second pressing block is provided with a first pressing rod (36) in a protruding mode.

When the double-closed type connecting male head (3) is connected with the double-closed type connecting female head (4), the end part of the double-closed type connecting female head (4) is sleeved at the end part of the double-closed type connecting male head (3) and is fixed through a positioning mechanism (5).

4. A pipe external sampler according to claim 3 and wherein: the utility model provides a female head (3) is connected to two closed type circumference has seted up positioning ring groove (51) on the lateral wall, circumference evenly distributed has a plurality of mounting grooves (53) just on the lateral wall of female head (4) is connected to two closed type the mounting groove (53) will the lateral wall of female head (4) is connected to two closed type runs through, positioning mechanism (5) include a plurality of positioning steel balls (54), a plurality of positioning steel balls (54) and a plurality of mounting groove (53) one-to-one and install in mounting groove (53), the diameter of positioning steel ball (54) is greater than the diameter of mounting groove (53), just positioning steel ball (54) are located outside female head (4) is connected to two closed type, positioning mechanism (5) still including be used for with positioning steel ball (54) support tight piece (55) in positioning ring groove (51).

5. The externally connected sampler for a pipeline as claimed in claim 4 wherein: the abutting piece (55) comprises a shell (551) which is sleeved on the double-closed connecting female head (4) in a sliding manner, an abutting ring (552) for pressing the positioning steel balls (54) into the positioning ring groove (51) is arranged on the inner side wall of the shell (551) in a protruding manner, and a limiting piece (56) for positioning the position of the shell (551) is arranged on the double-closed connecting female head (4).

6. The externally connected sampler for a pipeline as claimed in claim 5 wherein: the limiting piece (56) comprises a convex ring (561) protruding from the outer side wall of the double-closed connecting female head (4), a third spring (562) is sleeved outside the double-closed connecting female head (4), two ends of the third spring (562) are respectively abutted to the convex ring (561) and the abutting ring (552), a limiting ring (563) is sleeved on the outer side wall of the double-closed connecting female head (4), and the limiting ring (563) is located on one side, far away from the convex ring (561), of the mounting groove (53).

7. The externally connected sampler for a pipeline according to claim 1, wherein: the first three-way valve (23) comprises a T-shaped three-way ball valve.

8. The externally connected sampler for a pipeline according to claim 1, wherein: one end that goes out appearance pipe (24) is kept away from first three-way valve (23) is connected with second three-way valve (25), sampling tube (28) and exhaust tube (26) are connected respectively to two other ports of second three-way valve (25), sampling tube (28) keep away from one end of second three-way valve (25) with collection device (6) are connected, exhaust tube (26) are connected with negative pressure source (27).

9. The externally connected sampler for a pipeline as claimed in claim 8 wherein: the collecting device (6) comprises a liquid sampling bottle (61), and the bottle mouth of the liquid sampling bottle (61) is connected with the outlet of the sampling tube (28).

10. The externally connected sampler for a pipeline as claimed in claim 8 wherein: the collecting device (6) comprises a gas sampling bag (62) and a gas sampling needle (63), one end of the gas sampling needle (63) is connected with the outlet of the sampling tube (28), and the other end of the gas sampling needle (63) extends into the gas sampling bag (62).

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