Integrated anti-freezing pressure measuring and sampling device

Abstract

The application discloses an integrated anti-freezing pressure measuring and sampling device, which comprises a pressure measuring part and a sampling part. The pressure measuring part is characterized in that an upper circular groove is formed in the upper part of a main body, the upper circular groove is connected with a union joint through an anti-freezing shell and a thin tube sleeve in an upward direction, and the union joint is connected with a pressure gauge sleeve in an upward direction. The sampling part is characterized in that a side circular groove is formed in one side of the main body and opens outward, a center hole of the side circular groove is connected with a through hole, and a sampling shell is sleeved on the inner wall of the side circular groove. A piston rod is sleeved in the axial hole of the sampling shell. An outer section of the piston rod is sleeved with a stop nut, the stop nut is sleeved with the outer section of the sampling shell, an outer end of the piston rod that extends out of the stop nut is provided with a hand wheel, and a sampling port is formed in the axial hole of the sampling shell in a downward direction. The application belongs to the technical field of petroleum and chemical equipment and solves the problem that sampling cannot be performed due to the freezing of pressure measuring and sampling ports in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of petrochemical equipment technology and relates to an integrated anti-freeze pressure testing and sampling device. Background Technology

[0002] During winter oil extraction, especially in northern oilfields or field pipelines, the low temperatures mean that wellhead pipelines, pressure testing ports, and sampling ports, which typically consist of long sections of thin tubing connected to valves, often freeze and become blocked, causing significant difficulties for on-site sampling.

[0003] Therefore, there is an urgent need to design a new generation of integrated antifreeze pressure testing and sampling devices to meet the environmental protection, energy saving, high efficiency, and antifreeze requirements of production sites. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated anti-freeze pressure testing and sampling device, which solves the problem that the existing technology has unreasonable installation of pressure testing and sampling equipment on pipelines, resulting in the inability to sample due to freezing and blockage of the on-site pressure testing and sampling ports.

[0005] The technical solution adopted in this invention is an integrated anti-freeze pressure testing and sampling device, comprising a pressure testing section and a sampling section. The pressure measuring part has an upper circular groove on the upper part of the main body. The upper circular groove is connected to a union joint through an antifreeze shell and a thin tube. The union joint is connected to the pressure gauge. The sampling section has an outward-facing circular groove on one side of the main body. The center of the circular groove has an opening that communicates with a through hole. A sampling shell is fitted into the inner wall of the circular groove. A piston rod is fitted into the axial hole of the sampling shell. A stop nut is fitted onto the outer section of the piston rod. The stop nut is fitted into the outer section of the sampling shell. A handwheel is installed on the outer end of the piston rod that extends out of the stop nut. A sampling port is opened downward from the axial hole of the sampling shell.

[0006] The integrated antifreeze pressure sampling device of the present invention is further characterized in that: The upper circular groove has a central opening that connects downwards to a through hole. The inner wall of the upper circular groove is threaded. The upper circular groove is connected to the antifreeze shell via the thread. The inner cavity of the antifreeze shell is the piston cylinder. A thin tube is connected to the upper part of the antifreeze shell. A union is threaded onto the outer circumference of the thin tube. The union is threaded upwards and connected to the pressure gauge.

[0007] The antifreeze housing contains a piston and a spring. The cavity above the piston is connected to a pressure gauge through a thin tube. The cavity above the piston is filled with antifreeze. The lower end of the spring is fixedly connected to the piston, and the upper end of the spring is in contact with the top surface of the antifreeze housing. The cavity below the piston is connected to a through hole.

[0008] The sampling housing includes a thick neck in the inner section and a thin neck in the outer section. The thick neck in the inner section and the thin neck in the outer section share a central hole. This central hole communicates with the central opening and through hole of the side circular groove. A piston rod is fitted into this central hole.

[0009] At least one lower sealing ring is provided between the inner section of the piston rod and the inner wall of the axial hole of the thick neck part of the sampling housing.

[0010] The outer section of the piston rod is a thin rod, on which a stop nut is fitted. The stop nut is threaded into the inner wall of the central hole of the thin neck of the outer section of the sampling housing. A handwheel is installed at the outer end of the thin rod that extends out of the central hole of the stop nut.

[0011] The axial hole of the thick neck section of the sampling housing has a radial sampling channel that extends out of the sampling housing and is called the sampling port.

[0012] The threaded surface connecting the sampling housing and the main body is an outwardly expanding tapered shape. At the same time, the threaded connection surface between the thick neck part of the piston rod and the sampling housing is also an outwardly expanding tapered shape.

[0013] The piston has at least one upper sealing ring fitted on its outer circumference.

[0014] The beneficial effects of this invention are that the integrated antifreeze sampling and pressure testing device, when installed at the wellhead or other required pipeline locations, can be quickly assembled and disassembled under low-temperature conditions without affecting oil well production, and can quickly measure and sample the medium in the pressure pipeline. It has the advantages of being antifreeze, safe, environmentally friendly, and convenient. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall installation position of the device of the present invention; Figure 2 This is a schematic diagram of the closed state of the device of the present invention when no pressure sampling is performed; Figure 3 This is a schematic diagram of the open state of the device of the present invention during pressure measurement and sampling.

[0016] In the diagram, 1. Union, 2. Antifreeze housing, 3. Antifreeze, 4. Piston, 5. Through hole, 6. Main body, 7. Sampling housing, 8. Piston rod, 9. Stop nut, 10. Sampling port, 11. Handwheel, 12. Spring, 13. Pressure gauge, 14. Upper sealing ring, 15. Lower sealing ring, 16. Threaded interface. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0018] Reference Figure 1 and Figure 2The main body 6 of the device of the present invention is provided with a through hole 5. The two ends of the through hole 5 are respectively provided with threaded interfaces 16, which are respectively connected and fixed to the oil wellhead pipeline by threading. This ensures that the through hole 5 will not affect the normal oil transportation inside the oil wellhead pipeline, regardless of whether the device of the present invention is in pressure measurement or sampling state.

[0019] Reference Figure 2 and Figure 3 The structure of the device of the present invention includes a pressure measuring part and a sampling part. The pressure measuring part has an upper circular groove on the upper part of the main body 6. The center of the upper circular groove has an opening and is connected to the through hole 5 downwards. The inner wall of the upper circular groove is provided with threads. The upper circular groove is connected to the antifreeze shell 2 by the threads. The inner cavity of the antifreeze shell 2 is the piston cylinder. The upper part of the antifreeze shell 2 is connected to a thin tube. The outer circumference of the thin tube is connected to a union 1 by the threads. The union 1 is connected to the pressure gauge 13 upwards by the threads. A piston 4 and a spring 12 are installed inside the antifreeze housing 2. The cavity above the piston 4 is connected to the pressure gauge 13 through the inner hole of the thin tube. The cavity above the piston 4 is filled with antifreeze 3. The lower end of the spring 12 is fixedly connected to the piston 4, and the upper end of the spring 12 is in contact with the top surface of the inner cavity of the antifreeze housing 2. The cavity below the piston 4 is connected to the through hole 5 and is filled with crude oil. At least one upper sealing ring 14 is fitted on the outer circumference of the piston 4 to achieve a seal with the inner wall of the antifreeze housing 2. The sampling section has the following structure: a circular groove with an outward opening is formed on one side of the main body 6. The central opening of this circular groove communicates with a through hole 5. A sampling outer shell 7 is threaded onto the inner wall of this circular groove. The sampling outer shell 7 includes a thick inner neck and a thin outer neck. Both the thick inner neck and the thin outer neck share a central axial hole, which communicates with the central opening of the circular groove and the through hole 5. A piston rod 8 is fitted into this central axial hole. The inner section of the piston rod 8 is connected to the sampling outer shell. At least one lower sealing ring 15 is provided between the inner walls of the axial hole of the thick neck section 7; the outer section of the piston rod 8 is a thin rod, and a stop nut 9 is fitted on the thin rod. The stop nut 9 is threadedly connected to the inner wall of the axial hole of the thin neck section of the outer section of the sampling housing 7. A handwheel 11 is installed on the outer end of the thin rod of the piston rod 8 that extends out of the center hole of the stop nut 9; a radial sampling channel is opened downward in the axial hole of the thick neck section of the sampling housing 7, which extends all the way out of the sampling housing 7 and is called the sampling port 10.

[0020] The main functions of the device of this invention are: The union 1 enables the quick disassembly of pressure gauge 13; (when disassembling pressure gauge 13, the upstream pipeline switch needs to be temporarily closed to unload the pressure in the pipeline and enable quick replacement of pressure gauge 13) Piston 4 moves upward under the pressure of crude oil in through hole 5, squeezing antifreeze 3 into pressure gauge 13 and transmitting pressure to pressure gauge 13 to achieve indication, preventing water from entering the connecting pipe of pressure gauge 13 and causing it to freeze and become blocked. The upper sealing ring 14 ensures that crude oil does not leak upward from the antifreeze outer shell 2; The connecting threaded surface between the sampling housing 7 and the main body 6 is an outwardly expanding tapered shape. At the same time, the threaded connection surface between the thick neck part of the piston rod 8 and the sampling housing 7 is also an outwardly expanding tapered shape. The tapered outward expansion shape can enhance the tightness of the component connection, and when the piston rod 8 is withdrawn a short distance outward, a gap will be left on the circumference of the threaded surface so that crude oil can flow out from the sampling port 10.

[0021] The stop nut 9 is used to limit the maximum outward movement distance of the piston rod 8, preventing the piston rod 8 from accidentally coming out of the sampling housing 7.

[0022] The lower sealing ring 15 ensures the sealing performance when the piston rod 8 enters the innermost position of the axial hole in the thick neck part of the sampling housing 7, preventing crude oil leakage.

[0023] The threaded interfaces connecting the wellhead pipelines at both ends of the housing of the device of the present invention have a nominal diameter of 50 mm and are of type ZG2.

[0024] The overall sealing pressure inside the housing of the device of the present invention is 14-30 MPa.

[0025] The metal materials used in the device of this invention are all high-quality carbon steel, for example, the same material as the oil wellhead pipeline. The selection of carbon steel material is appropriate for the maximum pressure of the applicable medium.

[0026] The operating temperature of the device of this invention is -40~+100℃.

[0027] The applicable media for the device of the present invention are oil (suitable for pressures below 14 MPa), gas (suitable for pressures below 3 MPa), and water (suitable for pressures below 30 MPa).

[0028] The working principle of the device of this invention is as follows: 1) The integrated antifreeze pressure testing and sampling device of this invention is installed on the oil wellhead pipeline. Pressure is directly measured using the installed pressure gauge 13 (no crude oil leakage occurs when the pressure gauge needs to be removed, and the normal transport of crude oil is not affected). The oil pressure in the oil wellhead pipeline pushes the piston to squeeze the antifreeze, and the antifreeze transmits the squeezing force of the piston to the pressure gauge 13, thus achieving pressure measurement. During sampling, the handwheel 11 (equivalent to the sampling knob) is turned, and the piston rod 8 (equivalent to the valve core) moves outward, allowing the crude oil in the oil wellhead pipeline to flow out through the outlet channel, completing the sampling. After sampling, the handwheel 11 is reversed, and the piston rod 8 moves inward, pushing the crude oil in the sampling channel into the pipeline. No stagnant oil remains in the sampling channel, thus achieving the purpose of antifreeze.

[0029] 2) Traditional pressure testing and sampling devices often result in blind spots after oil sampling due to the narrow and long sampling channels, leaving some oil residue inside. Since oil usually contains moisture, this residue can freeze and become blocked at low temperatures. The integrated antifreeze pressure testing and sampling device of this invention prevents any oil from accumulating inside the sampling channel after sampling, thus achieving an antifreeze effect. The unique structure of this device provides excellent antifreeze performance, solving the problem of pressure testing and sampling being impossible due to freezing at the pressure testing and sampling ports. It also offers advantages such as easy installation and disassembly, secure connection, good sealing performance, and long service life.

[0030] Reference Figure 2 , Figure 3 The working process of this invention is as follows: 1) A pressure gauge 13 is connected to the thin tube at the top of the antifreeze casing 2. When no sampling is being performed, the handwheel 11 is in the closed position, and the oil in the wellhead pipeline flows normally, unaffected by the device of this invention. At this time, the oil pressure in the wellhead pipeline pushes the piston to transmit antifreeze to the pressure gauge 13 for pressure measurement, always displaying the oil pressure in the wellhead pipeline, thus preventing the pressure gauge 13 from freezing and becoming clogged.

[0031] 2) When sampling is required, open handwheel 11, and piston rod 8 moves outward. Crude oil in the wellhead pipeline flows out through the sampling channel to complete the sampling. After sampling, close handwheel 11, and piston rod 8 moves inward to push the accumulated crude oil in the sampling channel back into the wellhead pipeline. No stagnant oil remains in the outflow channel, thus achieving the purpose of antifreeze.

[0032] Example 1 It is used in an oil pipeline in a location in Qinghai Province, where the lowest temperature is -25℃.

[0033] The present invention employs the aforementioned structure, including a pressure measuring section and a sampling section. The pressure measuring part has an upper circular groove on the upper part of the main body 6. The center of the upper circular groove is connected to the through hole 5 downward. The inner wall of the upper circular groove is provided with threads, which are connected to the antifreeze shell 2 by means of threads. The inner cavity of the antifreeze shell 2 is the piston cylinder. A thin tube is connected to the upper part of the antifreeze shell 2. A union 1 is connected to the outer circumference of the thin tube by means of threads. A pressure gauge 13 is connected to the union 1 upward by threads. A piston 4 and a spring 12 are installed inside the antifreeze housing 2. The cavity above the piston 4 is connected to the pressure gauge 13 through the inner hole of the thin tube. The cavity above the piston 4 is filled with antifreeze 3. The lower end of the spring 12 is fixedly connected to the piston 4, and the upper end of the spring 12 is in contact with the top surface of the inner cavity of the antifreeze housing 2. The cavity below the piston 4 is connected to the through hole 5 and is filled with crude oil. At least one upper sealing ring 14 is fitted on the outer circumference of the piston 4. The sampling section has a circular groove with an outward opening on one side of the main body 6. The central opening of this circular groove communicates with the through hole 5. A sampling outer shell 7 is threaded onto the inner wall of this circular groove. The sampling outer shell 7 includes a thick inner neck and a thin outer neck. The thick inner neck and the thin outer neck share a central hole, which communicates with the central opening of the circular groove and the through hole 5. A piston rod 8 is fitted into this central hole. The inner section of the piston rod 8 is connected to the thick outer neck... At least one lower sealing ring 15 is provided between the inner walls of the axial hole of the neck portion; the outer section of the piston rod 8 is a thin rod, and a stop nut 9 is fitted on the thin rod. The stop nut 9 is threadedly connected to the inner wall of the axial hole of the thin neck portion of the outer section of the sampling housing 7. A handwheel 11 is installed on the outer end of the thin rod of the piston rod 8 that extends out of the center hole of the stop nut 9; a radial sampling channel is opened downward in the axial hole of the thick neck portion of the sampling housing 7, which extends all the way out of the sampling housing 7 and is called the sampling port 10.

[0034] Data from on-site installation tests were used to compare the freezing and blockage conditions before and after the installation of the integrated antifreeze pressure testing and sampling device. After a winter of testing, the integrated antifreeze pressure testing and sampling device showed no freezing or blockage in either the pressure testing or sampling sections.

[0035] Example 2 It is used in an oil pipeline in a location in Qinghai Province, where the lowest temperature is -30℃.

[0036] The present invention employs the aforementioned structure, including a pressure measuring section and a sampling section. The pressure measuring part has an upper circular groove on the upper part of the main body 6. The center of the upper circular groove is connected to the through hole 5 downward. The inner wall of the upper circular groove is provided with threads, which are connected to the antifreeze shell 2 by means of threads. The inner cavity of the antifreeze shell 2 is the piston cylinder. A thin tube is connected to the upper part of the antifreeze shell 2. A union 1 is connected to the outer circumference of the thin tube by means of threads. A pressure gauge 13 is connected to the union 1 upward by threads. A piston 4 and a spring 12 are installed inside the antifreeze housing 2. The cavity above the piston 4 is connected to the pressure gauge 13 through the inner hole of the thin tube. The cavity above the piston 4 is filled with antifreeze 3. The lower end of the spring 12 is fixedly connected to the piston 4, and the upper end of the spring 12 is in contact with the top surface of the inner cavity of the antifreeze housing 2. The cavity below the piston 4 is connected to the through hole 5 and is filled with crude oil. Two upper sealing rings 14 are fitted on the outer circumference of the piston 4. The sampling section has a circular groove with an outward opening on one side of the main body 6. The central opening of this circular groove communicates with the through hole 5. A sampling outer shell 7 is threaded onto the inner wall of this circular groove. The sampling outer shell 7 includes a thick inner neck and a thin outer neck. The thick inner neck and the thin outer neck share a central axial hole, which communicates with the central opening of the circular groove and the through hole 5. A piston rod 8 is fitted into this central axial hole. The inner section of the piston rod 8... Two lower sealing rings 15 are provided between the inner walls of the axial hole of the thick neck section; the outer section of the piston rod 8 is a thin rod, and a stop nut 9 is fitted on the thin rod. The stop nut 9 is threadedly connected to the inner wall of the axial hole of the thin neck section of the outer section of the sampling housing 7. A handwheel 11 is installed on the outer end of the thin rod of the piston rod 8 that extends out of the center hole of the stop nut 9; a radial sampling channel is opened downward in the axial hole of the thick neck section of the sampling housing 7, which extends all the way out of the sampling housing 7 and is called the sampling port 10.

[0037] Data from on-site installation tests were used to compare the freezing and blockage conditions before and after the installation of the integrated antifreeze pressure testing and sampling device. After a winter of testing, the integrated antifreeze pressure testing and sampling device showed no freezing or blockage in either the pressure testing or sampling sections.

[0038] Example 3 It is used in an oil pipeline in a location in Qinghai Province, where the lowest temperature is -35℃.

[0039] The present invention employs the aforementioned structure, including a pressure measuring section and a sampling section. The pressure measuring part has an upper circular groove on the upper part of the main body 6. The center of the upper circular groove is connected to the through hole 5 downward. The inner wall of the upper circular groove is provided with threads, which are connected to the antifreeze shell 2 by means of threads. The inner cavity of the antifreeze shell 2 is the piston cylinder. A thin tube is connected to the upper part of the antifreeze shell 2. A union 1 is connected to the outer circumference of the thin tube by means of threads. A pressure gauge 13 is connected to the union 1 upward by threads. A piston 4 and a spring 12 are installed inside the antifreeze housing 2. The cavity above the piston 4 is connected to the pressure gauge 13 through the inner hole of the thin tube. The cavity above the piston 4 is filled with antifreeze 3. The lower end of the spring 12 is fixedly connected to the piston 4, and the upper end of the spring 12 is in contact with the top surface of the inner cavity of the antifreeze housing 2. The cavity below the piston 4 is connected to the through hole 5 and is filled with crude oil. Two upper sealing rings 14 are fitted on the outer circumference of the piston 4. The sampling section has a circular groove with an outward opening on one side of the main body 6. The central opening of this circular groove communicates with the through hole 5. A sampling outer shell 7 is threaded onto the inner wall of this circular groove. The sampling outer shell 7 includes a thick inner neck and a thin outer neck. The thick inner neck and the thin outer neck share a central axial hole, which communicates with the central opening of the circular groove and the through hole 5. A piston rod 8 is fitted into this central axial hole. The inner section of the piston rod 8... A lower sealing ring 15 is provided between the inner walls of the axial hole of the thick neck section; the outer section of the piston rod 8 is a thin rod, and a stop nut 9 is fitted on the thin rod. The stop nut 9 is threadedly connected to the inner wall of the axial hole of the thin neck section of the outer section of the sampling housing 7. A handwheel 11 is installed on the outer end of the thin rod of the piston rod 8 that extends out of the center hole of the stop nut 9; a radial sampling channel is opened downward in the axial hole of the thick neck section of the sampling housing 7, which extends all the way out of the sampling housing 7 and is called the sampling port 10.

[0040] Data from on-site installation tests were used to compare the freezing and blockage conditions before and after the installation of the integrated antifreeze pressure testing and sampling device. After a winter of testing, the integrated antifreeze pressure testing and sampling device showed no freezing or blockage in either the pressure testing or sampling sections.

[0041] Example 4 It is used in an oil pipeline in a location in Gansu Province, where the lowest temperature is -25℃.

[0042] The present invention employs the aforementioned structure, including a pressure measuring section and a sampling section. The pressure measuring part has an upper circular groove on the upper part of the main body 6. The center of the upper circular groove is connected to the through hole 5 downward. The inner wall of the upper circular groove is provided with threads, which are connected to the antifreeze shell 2 by means of threads. The inner cavity of the antifreeze shell 2 is the piston cylinder. A thin tube is connected to the upper part of the antifreeze shell 2. A union 1 is connected to the outer circumference of the thin tube by means of threads. A pressure gauge 13 is connected to the union 1 upward by threads. A piston 4 and a spring 12 are installed inside the antifreeze housing 2. The cavity above the piston 4 is connected to the pressure gauge 13 through the inner hole of the thin tube. The cavity above the piston 4 is filled with antifreeze 3. The lower end of the spring 12 is fixedly connected to the piston 4, and the upper end of the spring 12 is in contact with the top surface of the inner cavity of the antifreeze housing 2. The cavity below the piston 4 is connected to the through hole 5 and is filled with crude oil. An upper sealing ring 14 is fitted on the outer circumference of the piston 4. The sampling section has a circular groove with an outward opening on one side of the main body 6. The central opening of this circular groove communicates with the through hole 5. A sampling outer shell 7 is threaded onto the inner wall of this circular groove. The sampling outer shell 7 includes a thick inner neck and a thin outer neck. The thick inner neck and the thin outer neck share a central axial hole, which communicates with the central opening of the circular groove and the through hole 5. A piston rod 8 is fitted into this central axial hole. The inner section of the piston rod 8... Two lower sealing rings 15 are provided between the inner walls of the axial hole of the thick neck section; the outer section of the piston rod 8 is a thin rod, and a stop nut 9 is fitted on the thin rod. The stop nut 9 is threadedly connected to the inner wall of the axial hole of the thin neck section of the outer section of the sampling housing 7. A handwheel 11 is installed on the outer end of the thin rod of the piston rod 8 that extends out of the center hole of the stop nut 9; a radial sampling channel is opened downward in the axial hole of the thick neck section of the sampling housing 7, which extends all the way out of the sampling housing 7 and is called the sampling port 10.

[0043] Data from on-site installation tests were used to compare the freezing and blockage conditions before and after the installation of the integrated antifreeze pressure testing and sampling device. After a winter of testing, the integrated antifreeze pressure testing and sampling device showed no freezing or blockage in either the pressure testing or sampling sections.

[0044] Example 5 It is used in natural gas pipelines in the Jiuquan area, where the lowest temperature is -25℃.

[0045] Using the structure of the present invention in the aforementioned embodiment 1, the freezing blockage situation before and after the installation of the integrated antifreeze pressure testing and sampling device was compared through data from on-site installation tests. After a winter of testing after installation, the integrated antifreeze pressure testing and sampling device did not show any freezing blockage in either the pressure testing part or the sampling part.

[0046] Example 6 It is used in natural gas pipelines in the Jiuquan area, where the lowest temperature is -25℃.

[0047] Using the structure of the present invention in Embodiment 2, the freezing blockage situation before and after the installation of the integrated antifreeze pressure testing and sampling device was compared through data from on-site installation tests. After a winter of testing after installation, the integrated antifreeze pressure testing and sampling device did not show any freezing blockage in either the pressure testing part or the sampling part.

Claims

1. An integrated anti-freeze pressure testing and sampling device, characterized in that: Includes pressure measurement and sampling sections. The pressure measuring part structure is as follows: an upper circular groove is opened on the upper part of the main body (6), and a union joint (1) is connected to the upper circular groove through the antifreeze shell (2) and the thin tube. The union joint (1) is connected to the pressure gauge (13) upward. The sampling part structure is as follows: a side circular groove with an outward opening is opened on one side of the main body (6), the center of the side circular groove is opened and communicates with the through hole (5), and a sampling shell (7) is sleeved on the inner wall of the side circular groove; a piston rod (8) is installed in the axial hole of the sampling shell (7); a stop nut (9) is sleeved on the outer section of the piston rod (8), the stop nut (9) is sleeved with the outer section of the sampling shell (7), and a handwheel (11) is installed on the outer end of the piston rod (8) extending out of the stop nut (9); a sampling port (10) is opened downward in the axial hole of the sampling shell (7).

2. The integrated anti-freeze pressure sampling device according to claim 1, characterized in that: The upper circular groove has a central opening and is connected downward to the through hole (5). The inner wall of the upper circular groove is provided with threads. The upper circular groove is connected to the antifreeze shell (2) by the threads. The inner cavity of the antifreeze shell (2) is the piston cylinder. The upper part of the antifreeze shell (2) is connected to a thin tube. The outer circumference of the thin tube is connected to a union (1) by the threads. The union (1) is connected upward to the pressure gauge (13) by the threads.

3. The integrated anti-freeze pressure sampling device according to claim 1, characterized in that: The antifreeze shell (2) is equipped with a piston (4) and a spring (12) in its inner cavity. The cavity above the piston (4) is connected to the pressure gauge (13) through the inner hole of the thin tube. The cavity above the piston (4) is filled with antifreeze (3). The lower end of the spring (12) is fixedly connected to the piston (4), and the upper end of the spring (12) is in contact with the top surface of the inner cavity of the antifreeze shell (2). The cavity below the piston (4) is connected to the through hole (5).

4. The integrated anti-freeze pressure sampling device according to claim 1, characterized in that: The sampling housing (7) includes a thick neck in the inner section and a thin neck in the outer section. The thick neck in the inner section and the thin neck in the outer section share a central hole. The central hole communicates with the central opening and through hole (5) of the side circular groove. A piston rod (8) is fitted in the central hole.

5. The integrated anti-freeze pressure sampling device according to claim 4, characterized in that: At least one lower sealing ring (15) is provided between the inner section of the piston rod (8) and the inner wall of the axial hole of the thick neck part of the sampling housing (7).

6. The integrated anti-freeze pressure sampling device according to claim 1, characterized in that: The outer section of the piston rod (8) is a thin rod, and a stop nut (9) is fitted on the thin rod. The stop nut (9) is threaded into the inner wall of the axial hole of the thin neck part of the outer section of the sampling housing (7). A handwheel (11) is installed on the outer end of the thin rod of the piston rod (8) that extends out of the center hole of the stop nut (9).

7. The integrated anti-freeze pressure sampling device according to claim 1, characterized in that: The sampling housing (7) has a radial sampling channel with a central hole at the bottom of the thick neck section, which extends out of the sampling housing (7) and is called the sampling port (10).

8. The integrated anti-freeze pressure sampling device according to claim 1, characterized in that: The connecting threaded surface between the sampling shell (7) and the main body (6) is an outwardly expanding cone shape. At the same time, the threaded connection surface between the thick neck part of the piston rod (8) and the sampling shell (7) is also an outwardly expanding cone shape.

9. The integrated anti-freeze pressure sampling device according to claim 1, characterized in that: The piston (4) is fitted with at least one upper sealing ring (14) on its outer circumference.

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