CN-224231386-U - Constant pressure type piston liquefied gas sampler

CN224231386UCN 224231386 UCN224231386 UCN 224231386UCN-224231386-U

Abstract

The utility model discloses a constant-pressure piston liquefied gas sampler which comprises a piston cylinder body, a sample injection valve, a sample discharge valve, a gas supply system and a pressure monitoring assembly, wherein a piston capable of reciprocating is arranged in the piston cylinder body, and the piston is stationary when the pressure of a first end is equal to 1MPa. According to the utility model, through the synergistic effect of the piston cylinder body, the pressure monitoring assembly and the gas supply system, the pressure is dynamically regulated in the sampling and lofting processes, the constant output pressure of the sample is ensured to be 1MPa, when the pressure is less than 1MPa, the gas pushes the piston to move towards the first end, and the pressure of the first end is maintained to be 1MPa constantly through the gas supply system. The needle valve is adopted to control the fluid path, the digital display pressure gauge is used for real-time monitoring, the safety relief valve is arranged to ensure the operation safety, the laboratory detection precision and the operation safety are obviously improved, and the method is suitable for sampling analysis of the medium under extremely strict working conditions. The utility model has compact structure, simple and convenient operation, explosion-proof shell design, corrosion resistance, high safety and environmental adaptability.

Inventors

TAN YU
ZHANG HEXIAO
LIU YI
WANG QI
LI SHUANG
ZHANG ZHENWU
CHAO ZILIANG

Assignees

抚顺市博瑞特科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250625

Claims (10)

1. The constant pressure type piston liquefied gas sampler is characterized by comprising a piston cylinder body, a sample injection valve, a sample discharging valve, a gas replenishing system and a pressure monitoring assembly, wherein the piston cylinder body is of a round cylinder body structure, two ends of the round cylinder body are integrally provided with a pipe body, a piston capable of reciprocating is arranged in the piston cylinder body, the sample injection valve, the sample discharging valve and a piston motion control valve are respectively arranged at a first end of the piston cylinder body, the gas replenishing system comprises a gas inlet valve and a gas pressure control inlet valve, the gas replenishing system is arranged at a second end of the piston cylinder body, the gas inlet valve is in sealing connection with the corresponding pipe body on the piston cylinder body through a reducing joint, the pressure monitoring assembly comprises a first gas pressure gauge and a second gas pressure gauge, the first gas pressure gauge is arranged adjacent to the sample injection valve and the sample discharging valve, the second gas pressure gauge is arranged between the gas inlet valve, the first gas pressure gauge and the second gas pressure gauge are respectively used for monitoring the pressure of the first end and the second end, the gas replenishing system is kept constant when the pressure of the first end is equal to 1MPa, and the pressure of the piston is kept constant when the pressure of the first end is equal to 1MPa, and the pressure of the first end is kept constant when the pressure is equal to 1MPa.
2. The constant pressure type piston liquefied gas sampler according to claim 1, wherein a plurality of sealing rings are uniformly arranged between the piston and the inner wall of the piston cylinder body at intervals, the sealing rings are semi-embedded into grooves correspondingly arranged on the outer side of the piston, the sealing rings are made of fluororubber, and the pressure-resistant grade of the sealing rings is more than or equal to 2MPa.
3. The constant pressure type piston liquefied gas sampler according to claim 1, wherein the air inlet valve, the piston motion control valve, the sample inlet valve and the sample outlet valve are needle valves, and the sample inlet valve and the sample outlet valve are respectively connected with the piston motion control valve in a sealing manner.
4. The constant pressure type piston liquefied gas sampler according to claim 1, wherein the piston cylinder body comprises a main body, a bottom cover and an upper cover, the upper cover is in rotary connection with the main body through threads correspondingly arranged, the inner bottom of the upper cover is provided with a sealing gasket corresponding to the main body, the bottom cover and the main body are welded into a whole, the upper cover and the bottom cover are respectively welded into a whole with the corresponding pipe body, the mouth parts of the pipe bodies are respectively provided with a mounting interface, and the main body coincides with the central axis of the corresponding pipe body.
5. The constant pressure type piston liquefied gas sampler according to claim 4, wherein the ratio of the movement stroke of the piston to the length of the piston cylinder is 1:3, the maximum displacement of the piston is 200mm, and the outer wall of the piston cylinder is provided with displacement marked by graduation marks.
6. The constant pressure type piston liquefied gas sampler according to claim 1, wherein the gas supply system further comprises an external gas source quick interface, a precise pressure regulating valve and a gas filtering assembly, the external gas source quick interface supports standard gas cylinder connection, the precise pressure regulating valve and the gas filtering assembly are integrated in the gas pressure control inlet valve, the precision regulating valve is integrated with a precision of +/-0.05 MPa, a 5- μm-level stainless steel filter screen is arranged in the gas filtering assembly, the gas filtering assembly is used for removing particle impurities in an external gas source, the external gas source is inert gas or compressed air, and the pressure regulating range of the external gas source is 0.5-2MPa.
7. The constant pressure piston liquefied gas sampler of claim 1, wherein the first gas pressure gauge has a precision level of 0.5 and a range of 0-2.5MPa, and the first gas pressure gauge supports bluetooth connection to a mobile terminal.
8. The constant pressure type piston liquefied gas sampler according to claim 1, wherein the second gas pressure gauge adopts a wireless transmission type digital display pressure sensor, the precision of the second gas pressure gauge is 0.25 level, the measuring range is 0-2.5MPa, the second gas pressure gauge is provided with an overload protection function, and when the pressure exceeds 1.2MPa, an audible and visual alarm is automatically triggered.
9. The constant pressure type piston liquefied gas sampler according to claim 1, wherein the reducer union is of a conical transition structure, the threads at the two ends of the reducer union are 1/4NPT, and the reducer union is made of stainless steel 316L.
10. The constant pressure type piston liquefied gas sampler according to claim 1, wherein the integral material of the sampler is stainless steel 316L, the applicable temperature range of the sampler is-20 ℃ to 80 ℃, and the pressure-resistant grade of the sampler is 6.0MPa.

Description

Constant pressure type piston liquefied gas sampler Technical Field The utility model relates to the technical field of gas sampling, in particular to a constant-pressure piston liquefied gas sampler. Background The liquefied gas sampler is a conventional instrument for sampling liquefied gas. The existing liquefied gas sampler can sample and store, but the sample in the sampler is reduced, the pressure is reduced, the liquefied gas is gasified, the component content is changed, the authenticity of a subsequent gas detection result is affected, the practicability of the gas sampler is reduced, on the other hand, the existing gas sampler needs to repeatedly collect and empty for repeated replacement when collecting gas, time is wasted, the purity of the collected gas is disqualified, the sampled gas is inconvenient to filter, impurities in the gas are removed, the filter screen is inconvenient to clean, and some liquefied gas needs to detect the content of the sample gas in the container under the condition of constant pressure, so that the content of harmful gas is judged. The current gas sampler can not adjust the sampling amount of gas, is unfavorable for the sampling work, can not satisfy the requirement of different sampling amounts of gas to current gas sampler carries inconvenient, and the volume is great, can not reach portable use, thereby influences the sampling progress of sampling personnel. Based on this, I have designed a constant pressure piston liquefied gas sampler to solve the above-mentioned problems. Disclosure of utility model The utility model aims to solve the technical problem of providing the constant-pressure type piston liquefied gas sampler which is simple in structure, convenient to use, convenient to carry, strong in observability and stable in experimental effect. In order to solve the technical problems, the technical scheme of the utility model is as follows: A constant pressure type piston liquefied gas sampler comprises a piston cylinder body, a sample injection valve, a sample discharging valve, a gas supply system and a pressure monitoring assembly, wherein the piston cylinder body is of a round cylinder body structure, two ends of the round cylinder body are integrally provided with a pipe body, a piston capable of reciprocating is arranged in the piston cylinder body, the sample injection valve, the sample discharging valve and a piston motion control valve are respectively arranged at a first end of the piston cylinder body, the gas supply system comprises a gas inlet valve and a gas pressure control inlet valve, the gas supply system is arranged at a second end of the piston cylinder body, the gas inlet valve is in sealing connection with the corresponding pipe body on the piston cylinder body through a reducing joint, the pressure monitoring assembly comprises a first gas pressure gauge and a second gas pressure gauge, the first gas pressure gauge is arranged adjacent to the sample injection valve and the sample discharging valve, the second gas pressure gauge is arranged between the gas inlet valve, the first gas pressure gauge and the second gas pressure control inlet valve, and the first gas pressure gauge is respectively used for monitoring the pressure of the first end and the second end, wherein when the pressure of the first end is equal to 1MPa, the pressure of the piston is smaller than 1MPa, and when the pressure of the first end is kept constant, and the pressure of the piston is kept constant, and the pressure of the pressure is kept to be 1MPa. In the structure, a plurality of sealing rings are uniformly arranged between the piston and the inner wall of the piston cylinder body at intervals, the sealing rings are semi-embedded into grooves formed in the outer side of the piston and correspond to the grooves, the sealing rings are made of polytetrafluoroethylene, and the pressure resistance level of the sealing rings is more than or equal to 2MPa. In the structure, the air inlet valve, the piston motion control valve, the sample inlet valve and the sample outlet valve are needle valves, and the sample inlet valve and the sample outlet valve are respectively in sealing connection with the piston motion control valve. In the above-mentioned structure, the piston cylinder body includes main part, bottom, upper cover, the upper cover with the screw thread swivelling joint that corresponds the setting is passed through to the main part, the inboard bottom of upper cover corresponds the main part is established with sealed the pad, the bottom with the main part welding is as an organic whole, upper cover, bottom respectively with the correspondence the body welding is as an organic whole, the oral area of body all is equipped with the installation interface, the main part with the central axis coincidence of corresponding the body. In the structure, the ratio of the movement stroke of the piston to the length of the piston cylinder body is 1:3, the maximum disp