A thermometer resistant to high temperature and high pressure

Abstract

The present invention discloses a high-temperature and high-pressure resistant thermometer, which comprises a tube shell (1) and a circuit adapter board (2); a circuit adapter board (2) is arranged inside the tube shell (1), a linear thermistor (3) is arranged on the bottom surface of the circuit adapter board (2), leads (4) of the linear thermistor (3) penetrate out from the top surface of the circuit adapter board (2) and are connected with high-temperature wires (5), the whole circuit adapter board (2) is potted inside the tube shell (1), and a cover plate (6) is arranged at the top of the tube shell (1). By improving the existing temperature testing equipment, the present invention only needs to screw the external pipe thread carried by the tube shell onto the oil well temperature testing port during installation, without considering the fluctuation range of the oil well temperature testing, thereby reducing the installation requirements and debugging costs, improving the cost performance and practicability of the thermometer, and solving the problems of inconvenient on-site installation and debugging.

Description

Technical Field

[0001] The present invention relates to a high-temperature and high-pressure resistant thermometer, belonging to the technical field of temperature measurement. Background Art

[0002] In digital oilfield testing of oil well temperature, temperature transmitters are usually used. The temperature sensing heads of temperature transmitters all adopt PT1000 type temperature sensing heads. The existing temperature sensing heads have complex structures and high prices. In addition, the difference in high-temperature and high-pressure resistance of temperature transmitters is large, and debugging is rather troublesome. It is inconvenient to install and use on-site. Before each installation, it is necessary to find out the fluctuation range of the oil well temperature. Once the oil well adopts high-temperature steam pressurization operation, when the temperature transmitter cannot withstand the continuous heating of about 200 degrees of steam high temperature, it will be damaged, thus unable to measure the temperature normally, affecting the conventional temperature measurement of the oil well by the oilfield. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-temperature and high-pressure resistant thermometer with a simple structure, high-temperature and high-pressure resistance, low manufacturing cost, and convenient installation and use, so as to overcome the deficiencies of the prior art.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A high-temperature and high-pressure resistant thermometer of the present invention includes a tube shell and a circuit adapter board; a circuit adapter board is arranged inside the tube shell, a linear thermistor is arranged on the bottom surface of the circuit adapter board, the leads of the linear thermistor pass through the top surface of the circuit adapter board and are connected to high-temperature wires, the entire circuit adapter board is potted inside the tube shell, and a cover plate is arranged on the top of the tube shell.

[0006] In the aforementioned high-temperature and high-pressure resistant thermometer, an external pipe thread for connecting to the temperature test port on the oil well production tree is arranged at the bottom of the tube shell.

[0007] In the aforementioned high-temperature and high-pressure resistant thermometer, an adiabatic material is potted in the cavity between the top surface of the circuit adapter board and the cover plate.

[0008] In the aforementioned high-temperature and high-pressure resistant thermometer, a heat-conducting material is potted in the cavity between the bottom surface of the circuit adapter board and the lower opening of the tube shell.

[0009] In the aforementioned high-temperature and high-pressure resistant thermometer, a high-temperature wire lead-out hole is arranged in the center of the cover plate, and the high-temperature wire is led out from the high-temperature wire lead-out hole; the cover plate is threadedly connected to the top of the tube shell.

[0010] Due to the adoption of the above technical solution, compared with the prior art, the present invention improves the existing temperature testing equipment. During installation, only the external pipe thread of the pipe shell needs to be screwed onto the oil well temperature testing port. Due to the use of low-cost linear thermistors, not only the manufacturing cost is effectively reduced, but also by cleverly installing the linear thermistor on the bottom surface of the circuit adapter board and encapsulating it in the pipe shell, the detection accuracy, high temperature resistance and high pressure resistance of the entire thermometer are effectively improved. Through the ingenious combination of structure and materials, the present invention can not only withstand high temperature and high pressure, but also does not need to consider the fluctuation range of oil well temperature testing during use, effectively reducing the installation requirements and debugging costs, improving the cost performance and practicability of the thermometer, and solving the problem of inconvenient on-site installation and debugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural view of the present invention.

[0012] Description of reference numerals: 1 - pipe shell, 2 - circuit adapter board, 3 - linear thermistor, 4 - lead, 5 - high temperature wire, 6 - cover plate, 7 - external pipe thread, 8 - heat insulation material, 9 - heat conduction material, 10 - lead-out hole. DETAILED DESCRIPTION OF THE INVENTION

[0013] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0014] A high temperature and high pressure resistant thermometer of the present invention, as Figure 1 shown, includes a pipe shell 1 and a circuit adapter board 2; a circuit adapter board 2 is provided inside the pipe shell 1, a linear thermistor 3 is provided on the bottom surface of the circuit adapter board 2, the lead 4 of the linear thermistor 3 passes through the top surface of the circuit adapter board 2 and is connected to a high temperature wire 5, the entire circuit adapter board 2 is potted in the pipe shell 1, and a cover plate 6 is provided at the top of the pipe shell 1. An external pipe thread 7 for connecting to the temperature testing port on the oil well production tree is provided at the bottom of the pipe shell 1. An insulating material 8 is potted in the cavity between the top surface of the circuit adapter board 2 and the cover plate 6; a heat conducting material 9 is potted in the cavity between the bottom surface of the circuit adapter board 2 and the lower opening of the pipe shell 1; both the insulating material 8 and the heat conducting material 9 can directly adopt the commonly used insulating materials and heat conducting materials in the prior art. A high temperature wire lead-out hole 10 is provided in the center of the cover plate 6, and the high temperature wire 5 is led out from the high temperature wire lead-out hole 10; and the cover plate 6 is threadedly connected to the top of the pipe shell 1 to complete.

[0015] The temperature sensing heads of existing temperature transmitters all use PT1000, and the price of the temperature sensing heads is relatively high. In addition, the difference in high temperature and high pressure resistance of temperature transmitters is large, and debugging is rather troublesome. It is inconvenient to install and use on-site. Before each installation, it is necessary to find out the fluctuation range of the oil well temperature. Once the oil well adopts high-temperature steam pressurization operation, when the temperature transmitter cannot withstand the continuous heating of the steam high temperature, it will be damaged, thus unable to measure the temperature normally, affecting the conventional temperature measurement of the oil well by the oil field.

[0016] This example is an improvement on the existing temperature transmitter. The specific improved structure is as Figure 1 shown, including a linear thermistor 3. The linear thermistor 3 has a temperature sensing part and has linearity. The lead 4 of the linear thermistor 3 passes out from the top surface of the circuit adapter board 2 and is welded to the circuit adapter board 2; the lead 4 of the linear thermistor 3 is welded to the high-temperature wire 5. Then the linear thermistor 3 is downward and the circuit adapter board 2 is installed into the shell 1. The inside of the shell 1 is a hollow column to facilitate the installation of the circuit adapter board 2. The bottom end surface of the shell 1 is processed with an external pipe thread 7 to facilitate the installation of the shell 1 on the temperature test port of the oil well Christmas tree. The entire circuit adapter board 2 together with the linear thermistor 3 and the high-temperature wire 5 is potted in the shell 1.

[0017] The shell 1 is made of 316 heat-resistant steel material, which is convenient for processing and pressure-resistant design. The thermometer in this example is very small, and the shell 1 with an external pipe thread 7 can be quickly installed on-site. The thermometer in this example uses the linear thermistor 3 to measure the temperature, without an exposed sensing head, which well solves the problem of inconvenient installation and debugging in the prior art.

[0018] A thermometer made by using the self-temperature sensing linear characteristic of a linear thermistor disclosed by the present invention. In the present invention, the linear thermistor is welded to the bottom surface of the circuit adapter board, and a high-temperature wire is arranged on the upper surface of the circuit adapter board. Together, they form a component and are installed in the shell. The inner cavity of the shell is a hollow column to facilitate the installation and fixation of the entire component. The bottom end surface of the shell has an external pipe thread to facilitate installation on the oil well Christmas tree. The circuit adapter board is sealed in the shell through a tube cap. The thermometer in this example uses the linear thermistor to measure the temperature, without an exposed sensing head, which well solves the problem of inconvenient installation in the prior art, also reduces the installation requirements and costs, and improves the cost performance and practicability of the thermometer.

Claims

1. A high-temperature and high-pressure resistant thermometer, comprising a tube shell (1) and a circuit adapter board (2); It is characterized in that: The circuit adapter board (2) is arranged inside the tube shell (1). A linear thermistor (3) is provided on the bottom surface of the circuit adapter board (2). The lead wire (4) of the linear thermistor (3) passes through the top surface of the circuit adapter board (2) and is connected to a high-temperature wire (5). The entire circuit adapter board (2) is potted inside the tube shell (1), and a cover plate (6) is provided at the top of the tube shell (1); An external pipe thread (7) for connecting to a temperature test port on an oil well production tree is provided at the bottom of the tube shell (1); An adiabatic material (8) is potted in the cavity between the top surface of the circuit adapter board (2) and the cover plate (6); A heat-conducting material (9) is potted in the cavity between the bottom surface of the circuit adapter board (2) and the lower opening of the tube shell (1); A high-temperature wire lead-out hole (10) is provided in the center of the cover plate (6), and the high-temperature wire (5) is led out from the high-temperature wire lead-out hole (10); The cover plate (6) is threadedly connected to the top of the tube shell (1).

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