Pressure measurement protection device in strong irradiation environment

Abstract

The invention relates to the field of radiation environment parameter measurement, discloses a pressure measurement protection device in a strong irradiation environment, and solves the problems of low pressure measurement accuracy and single adaptive condition in the existing strong irradiation and strong impact environment. The device comprises a measuring device mounting table, a conical head, a reducing pressure guide head, a multi-stage composite spiral pressure guide pipe, a buffer cavity, a mounting cavity, a fixed flange, a blocking bolt and a pressure guide damping material. The conical head weakens pressure impact high-frequency components, the variable-diameter pressure guide head, the multi-stage composite spiral pressure guide pipe and the pressure guide damping material in the buffer cavity conduct pressure to the front end face of the mounting cavity, and protection of the measuring device is achieved. The device has the advantages of being resistant to radiation and high-pressure impact, reasonable in structure, easy to install, low in cost and suitable for pressure measurement safety protection in the strong-radiation or strong-impact environment such as nuclear power station operation and maintenance and nuclear medicine detection, and the accuracy of the measurement result is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of environmental parameter measurement under radiation conditions, specifically a pressure measurement and protection device for strong radiation environments. Background Technology

[0002] In radiation environments such as nuclear power plant operation and maintenance, and nuclear medicine testing, silicon piezoresistive pressure sensors are one of the important means of obtaining pressure parameters. Due to their high measurement accuracy, good stability, and fast response speed, this type of sensor is increasingly widely used in pressure testing under special conditions such as radiation and shock environments. However, due to the structural characteristics and material properties of silicon piezoresistive pressure sensors, their output signal will change to some extent in radiation environments, causing the pressure measurement results to deviate from the true value.

[0003] The current method involves quantitatively calibrating the influence of pressure measuring elements in a standard radiation field, and then using compensation algorithms and calibration data to calculate a relatively accurate pressure value. However, the pressure measurement data obtained by the above testing method has limited applicability and low accuracy, making it difficult to meet the requirements of precise testing. Therefore, to obtain relatively accurate pressure measurement data under strong radiation environments and impacts, it is necessary to strengthen the protection of pressure measuring elements against radiation and pressure shocks.

[0004] To meet the pressure measurement requirements of the aforementioned special testing environment, a pressure measurement protection device resistant to strong radiation and strong impact needs to be designed to solve the problem of accurate pressure parameter measurement under strong radiation and strong impact environmental conditions, realize long-term measurement of pressure changes by relevant measuring devices, and meet the pressure accuracy measurement needs of relevant industries. Summary of the Invention

[0005] (a) Technical problems to be solved The present invention aims to provide a pressure measurement protection device under strong radiation environment, so as to solve the problems of easy damage and inaccurate measurement results of pressure measurement devices under strong radiation and strong impact environment in the prior art.

[0006] (II) Technical Solution To achieve the above objectives, this invention proposes a pressure measurement protection device for strong radiation environments. Its core idea is to design a composite protection structure combining a conical head and a multi-stage composite spiral pressure-conducting tube, coupled with the buffering and transmission effect of pressure-conducting damping materials. Simultaneously, by optimizing specific materials and structural parameters, it achieves dual protection against radiation and high-pressure impact for the measuring device, ensuring the accuracy and stability of pressure measurements. The specific technical solution is as follows: The protective device, such as Figure 1 — Figure 11As shown, the main components include a measuring device mounting platform 1, a conical head 2, a variable-diameter pressure guiding head 3, a multi-stage composite spiral pressure guiding tube 4, a buffer chamber 5, a mounting chamber 6, a fixed flange 7, a plugging bolt 8, and pressure-conducting damping material 9. The measuring device mounting platform 1 is used to accommodate measuring devices with different interface sizes; the conical head 2 can significantly reduce the high-frequency components in pressure shocks; the variable-diameter pressure guiding head 3, the multi-stage composite spiral pressure guiding tube 4, and the buffer chamber 5 form a pressure transmission assembly, filled with pressure-conducting damping material 9, which transmits pressure to the front end face of the mounting chamber 6, thereby effectively protecting the measuring device within the mounting chamber 6.

[0007] The measuring device mounting platform 1 has an axial center through hole structure with internal and external double threads, such as... Figure 1 As shown, the fixed external thread 101 matches the mounting hole 504 of the buffer chamber measuring device, the measuring device mounting internal thread 102 matches the mounting thread of the measuring device, and the diameter of the central through hole 103 is not less than 5mm, and the material is Q345 steel. It also includes a metal gasket 104, which is a ring-shaped structure with an inner diameter of not less than 10mm, a difference between the inner and outer diameters of not less than 10mm, a thickness of 1 to 2mm, and is made of pure copper or copper alloy to ensure sealing performance.

[0008] The conical head 2, as Figure 2 As shown, the front end is a conical surface 201, and the apex angle θ of the conical surface 201 ranges from 30 degrees to 180 degrees. The angle and the height of the bottom cylindrical surface can be adjusted according to the magnitude of the impact pressure. The height of the lateral cylindrical surface 202 is not less than 50 mm. A small-diameter through hole 204 with a diameter not greater than 20 mm is opened on the lateral cylindrical surface 202. A thread 205 with a length not less than 15 mm is set in the hole. A through hole with a diameter not less than 20 mm is set at the half-radius point of the conical head's circular plane and is perpendicularly connected to the small-diameter through hole 204 on the lateral cylindrical surface. The connecting rod 203 has a diameter not less than 50 mm and a length not less than 350 mm. It is connected to the buffer chamber 5 and is made of Q345 steel.

[0009] The variable diameter pressure guide head 3 has a T-shaped structure, such as... Figure 3 As shown, the lower part has an external thread 301 that matches the internal thread 205 of the tapered head, and a through hole 302 is opened at the axial center position. The hole diameter Φ ranges from 5mm to 15mm, and the material is Q345 steel.

[0010] The multi-stage composite spiral pressure-guiding pipe 4 is a spiral pressure-guiding pipe surrounding the conical head connecting rod 203, such as... Figure 4 As shown, the number of spiral turns and the diameter of the pipe can be adjusted according to the protection requirements. The outer diameter of the pipe can be adjusted from 10mm to 40mm, and the number of spiral turns can be adjusted from 3 to 8. The front end is connected to the rear circular plane of the conical head and is connected to the small diameter through hole 204. The rear end is connected to the cylindrical cavity 501 of the buffer chamber, which is made of Q345 steel.

[0011] The buffer cavity 5 is a cylindrical cavity 501, such as Figure 5 As shown, the inner diameter Φ of the bottom surface of the cylinder is not less than 230mm, the cavity length is not less than 235mm, and a pressure-conducting damping material injection hole 502 is set at the middle position of the cylinder height. The diameter is not less than 20mm and an internal thread 503 is opened in the hole. Two measuring device mounting holes 504 are symmetrically set on both sides of the bottom end face along the center. The hole diameter is not less than 20mm and the hole spacing is not less than 40mm. Each measuring device mounting hole is provided with an internal thread and the material is Q345 steel.

[0012] The mounting cavity 6 is a cylindrical protective cavity, such as... Figure 6 As shown, its length is not less than 280mm, and its diameter is 130mm≤Φ≤240mm. The front end of the mounting cavity is provided with a ring-shaped fixing plate and at least 6 through holes 602 evenly distributed along the circumference. It is connected to the buffer cavity 5 with bolts and sealed with gaskets to enhance the seal. The rear end of the mounting cavity is provided with a ring-shaped fixing plate and at least 4 through holes 603 evenly distributed along the circumference. The material is Q235 steel.

[0013] The diameter of the fixed flange 7 matches that of the mounting cavity 6, such as Figure 7 As shown, a through hole with a diameter of not less than 30mm is provided at the center of flange 701, and a sealing groove and mounting hole 702 are provided. The material is Q235 steel.

[0014] The diameter of the plugging bolt 8 matches the injection hole 502 of the buffer chamber, such as... Figure 8 As shown, the top of the bolt is a round wide-corner nut 801 with a cornice width of not less than 5mm, and the thread 802 matches the internal thread 503 of the buffer cavity injection hole. The material is Q235 steel.

[0015] The pressure-conducting damping material 9 is a liquid fillable material that fills the conical head small-diameter through hole 204, the multi-stage composite spiral pressure-conducting tube 4, and the buffer cavity 5, and is in direct contact with the front end face of the mounting cavity 6, for transmitting pressure and damping impact.

[0016] The measurement protection principle of this invention is as follows: First, the conical head weakens the instantaneous frontal pressure impact, while the pressure to be measured is transmitted and loaded to the front end face of the mounting cavity through the damping material filled in the variable diameter pressure guide head, multi-stage composite spiral pressure guide tube, and buffer cavity components on the conical head. Second, the conical head forms an attenuation medium for gamma radiation, and the combined length parameter of the conical head and its rear connecting rod can be calculated from the dose value of the gamma radiation field, thereby eliminating the influence of gamma radiation on the measuring device and achieving safe protection during the pressure measurement process. Under the same test conditions, the pressure measurement data before and after using the measurement protection device of this invention were analyzed and compared. The results show that after using the device of this invention, accurate measurement of environmental pressure can be achieved under the conditions that the instantaneous impact pressure is not greater than 50 MPa and the gamma radiation dose is not greater than 2000 Gy.

[0017] (III) Beneficial Effects Compared with the prior art, the present invention has the following beneficial effects: 1. The front end of the conical head in this invention is a conical surface, which can effectively reduce the impact of instantaneous airflow, protect the normal operation of the measuring device, and according to the magnitude of the instantaneous impact pressure, by designing and adjusting the size of the apex angle of the conical surface and the height of the bottom cylindrical surface, it can resist the instantaneous impact pressure of hundreds of MPa.

[0018] 2. The variable diameter pressure guide head of the present invention has a T-shaped structure. The lower part of the T-shaped structure has an external thread that matches the internal thread of the cylindrical surface of the conical head, and a through hole is opened at the axial center position of the T-shaped structure. By setting through holes with different diameters Φ, pressure protection under instantaneous impact pressure of different magnitudes can be achieved. Under the condition that the pressure measurement frequency response meets the requirements, the stable operation of related measuring devices is further guaranteed.

[0019] 3. The multi-stage composite spiral pressure guiding pipe of the present invention is a spiral pressure guiding pipe that surrounds the connecting rod of the conical head. By adjusting the number of spiral turns and the pipe diameter, the effective pressure transmission distance can be adjusted equivalently, thereby further improving the protection performance of the device and reducing the impact of instantaneous environmental pressure shocks on the measuring device.

[0020] 4. This invention uses liquid damping material to fill the small-diameter through hole, multi-stage composite spiral pressure guide tube and buffer cavity inside the conical head, and directly contacts the front end face of the mounting cavity, so as to transmit the external pressure to the end face of the mounting cavity of the measurement protection device. This can effectively avoid instantaneous pressure impact directly acting on the end face of the relevant measuring device, and ensure the survival and stable operation of the measuring device.

[0021] 5. In environments with strong radiation and high pressure, this invention has good impact protection and radiation resistance. It also has the advantages of flexible design and relatively convenient processing and installation. It can achieve safe protection of pressure measuring devices in environments with strong impact and radiation. It has high application prospects in pressure measurement practices in radiation environments such as aerospace testing, nuclear power plant operation and maintenance, and nuclear medicine. Attached Figure Description

[0022] Figure 1 A cross-sectional view of the measuring device mounting platform for the measuring protective device, showing the fixing external thread 101, the measuring device mounting internal thread 102, the central through hole 103, and the metal gasket 104; Figure 2 A sectional view of the conical head of the measuring protective device, showing the front conical surface 201, the lateral cylindrical surface 202, the connecting rod 203, the small-diameter through hole 204, and the thread 205; Figure 3A cross-sectional view of the variable diameter guide head of the measuring protective device, showing the external thread 301 and the through hole 302; Figure 4 A schematic diagram of a multi-stage composite spiral pressure-conducting pipe structure for a measurement protection device, showing a spiral pressure-conducting channel 4; Figure 5 This is a cross-sectional view of the buffer cavity of the measuring protective device, which shows a cylindrical cavity 501, a filling hole 502, an internal thread 503, and a measuring device mounting hole 504; Figure 6 A cross-sectional view of the installation cavity of the measuring protective device, showing the protective cylinder 601, the front through hole 602 and the rear through hole 603; Figure 7 A front view of the fixed flange of the measuring protective device, showing flange 701 and sealing assembly 702; Figure 8 A cross-sectional view of the plugging bolt for measuring the protective device, showing the wide-angle nut 801 and thread 802; Figure 9 A schematic diagram of the damping material filling of the protective device is shown, which illustrates the filling state of the pressure-conducting damping material 9 in the conical head small-diameter through hole 204, the multi-stage composite spiral pressure-conducting tube 4, and the buffer cavity 5. Figure 10 This is a schematic diagram showing the location of the opening in the protective device, which illustrates the position of the small-diameter through hole 204 on the conical head; Figure 11 This is a schematic diagram of the overall structure of the measuring protection device, showing the measuring device mounting platform 1, conical head 2, variable diameter pressure guiding head 3, multi-stage composite spiral pressure guiding tube 4, buffer chamber 5, and mounting chamber. Detailed Implementation

[0023] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can accurately implement the present invention.

[0024] In this embodiment, a pressure measurement protection device under strong radiation environment includes a measuring device mounting platform 1, a conical head 2, a variable diameter pressure guiding head 3, a multi-stage composite spiral pressure guiding tube 4, a buffer cavity 5, a mounting cavity 6, a fixed flange 7, a plugging bolt 8, and a pressure guiding damping material 9.

[0025] The measuring device mounting platform 1 includes a fixing external thread 101, a measuring device mounting internal thread 102, a central through hole 103, and a metal washer 104. The fixing external thread 101 matches the measuring device mounting hole 504 in the buffer chamber, and the measuring device mounting internal thread 102 matches the mounting thread of the measuring device. The central through hole 103 has a diameter of 8mm and is made of Q345 steel. The metal washer 104 has a ring-shaped structure, an inner diameter of 10mm, an outer diameter of 15mm, a thickness of 2mm, and is made of pure copper.

[0026] The conical head 2 consists of a front conical surface 201, a lateral cylindrical surface 202, and a connecting rod 203. The apex angle θ of the front conical surface 201 is 120 degrees. The height of the lateral cylindrical surface 202 is 50 mm. A small-diameter through hole 204 with a diameter of 20 mm is opened on the lateral cylindrical surface 202, and a thread 205 with a length of 15 mm is installed in the hole. A 20 mm diameter through hole is set at a radius of 150 mm on the rear circular plane of the conical head, which is perpendicular to the small-diameter through hole 204. The connecting rod 203 has a diameter of 50 mm, a length of 350 mm, and is made of Q345 steel.

[0027] The variable diameter pressure guide head 3 has a T-shaped structure. The lower part has an external thread 301 that matches the internal thread 205 of the tapered head. A through hole 302 with a diameter Φ of 15mm is opened at the axial center position. The material is Q345 steel.

[0028] The multi-stage composite spiral pressure guiding pipe 4 is a spiral pressure guiding pipe that surrounds the conical head connecting rod 203. The pipe has an outer diameter of 30mm and 3 spiral turns. The front end is tightly connected to the circular plane through hole at the rear end of the conical head, and the rear end is connected to the cylindrical cavity 501 of the buffer chamber 5. The material is Q345 steel.

[0029] The buffer cavity 5 is a cylindrical cavity 501 with an inner diameter of Φ200mm at the bottom surface and a cavity height of 235mm. A 20mm diameter injection hole 502 is opened at the middle of the cylinder height, and an internal thread 503 is opened in the hole. Two measuring device mounting holes 504 are symmetrically arranged on both sides of the bottom end face along the center. The hole diameter is 20mm and the hole spacing is 40mm. Each hole is provided with an internal thread and is made of Q345 steel.

[0030] The mounting cavity 6 is a cylindrical protective cavity. The protective cylinder 601 is 280mm long and has an outer diameter of Φ130mm. The front end of the mounting cavity is equipped with a ring-shaped fixing plate and six through holes 602 evenly distributed around the circumference. It is fixedly connected to the buffer cavity 5 with bolts and reinforced with sealing washers. The rear end of the mounting cavity is equipped with a ring-shaped fixing plate and four through holes 603 evenly distributed around the circumference. The material is Q235 steel.

[0031] The fixed flange 7 includes a flange center hole 701 and a sealing component 702. The flange diameter is 130mm. A through hole 701 with a diameter of Φ30mm is provided at the center position and the sealing component 702 is installed. The material is Q235 steel.

[0032] The plugging bolt 8 includes a wide-angle nut 801 and a thread 802, the thread 802 matching the thread 503 of the buffer cavity injection hole, and is made of Q235 steel.

[0033] The pressure-conducting damping material 9 is a high-temperature resistant silicone oil with a viscosity of 500cc, which fills the conical head small-diameter through hole 204, the multi-stage composite spiral pressure-conducting tube 4 and the buffer cavity 5, and is in direct contact with the front end face of the mounting cavity 6.

[0034] The application process of this embodiment is as follows: A silicon piezoresistive pressure sensor is installed on the measuring device mounting platform 1. The sensor cable is led out through the through hole 701 and sealing assembly 702 of the fixing flange 7 and connected to the signal acquisition device. The assembled protective device is placed in the radiation calibration source chamber, and a strong gamma radiation environment is generated using a 100,000 Curie cobalt source radiation device to simulate a combined strong irradiation and strong impact condition. Experimental results show that the device can effectively resist gamma radiation up to 2000 Gy and instantaneous impact pressure up to 50 MPa. The sensor output signal is stable, and the accuracy of the measurement data is significantly improved compared with existing methods, meeting the pressure measurement requirements under strong irradiation environments.

[0035] Although the present invention has been described in detail with reference to embodiments, those skilled in the art can make modifications or equivalent substitutions to the present invention without departing from the spirit and principles thereof, and such modifications or equivalent substitutions should be included within the protection scope of the present invention.

Claims

1. A pressure measurement protection device under strong radiation environment, comprising a measuring device mounting platform (1), a conical head (2), a variable diameter pressure guiding head (3), a multi-stage composite spiral pressure guiding tube (4), a buffer chamber (5), a mounting chamber (6), a fixed flange (7), a plugging bolt (8), and a pressure guiding damping material (9), characterized in that: The measuring device mounting platform (1) includes a fixing external thread (101), a measuring device mounting internal thread (102), and a central through hole (103) for mounting and fixing the measuring device; The conical head (2) consists of a front conical surface (201), a lateral cylindrical surface (202), and a connecting rod (203). A small-diameter through hole (204) is provided on the lateral cylindrical surface (202), and a thread (205) is provided in the hole to weaken the high-frequency components in the pressure impact. The variable diameter pressure guide head (3) has an external thread (301) that matches the internal thread (205) of the tapered head (2), and a through hole (302) is opened at the axial center position for adjusting the pressure transmission hole diameter; The multi-stage composite spiral pressure guide tube (4) is a spiral pressure guide channel that surrounds the connecting rod (203) of the conical head. The number of spiral turns is variable, which is used to extend the pressure transmission path and attenuate the impact. The buffer cavity (5) is a cylindrical cavity (501), with a filling hole (502) on the cylindrical surface and an internal thread (503) in the small hole. Two measuring device mounting holes (504) are opened at the bottom of the buffer cavity (5) to accommodate the pressure-conducting damping material and the mounting platform for the measuring device. The mounting cavity (6) mainly consists of a protective cylinder (601) and a sealing gasket (602), which are used to accommodate and protect the measuring device; The fixed flange (7) mainly consists of a flange (701) and a sealing assembly (702) for fixing and sealing the mounting cavity; The plugging bolt (8) mainly consists of a wide-angle nut (801) and a thread (802), used to seal the injection hole (502) of the buffer cavity. The pressure-conducting damping material (9) is a liquid fillable material that fills the conical head small-diameter through hole (204), the multi-stage composite spiral pressure-conducting tube (4) and the buffer cavity (5), and is in direct contact with the front end face of the mounting cavity (6) to conduct pressure and dampen impact.

2. The pressure measurement and protection device under strong radiation environment according to claim 1, characterized in that... The external thread (101) of the measuring device mounting platform (1) matches the measuring device mounting hole (504) of the buffer cavity, and the internal thread matches the measuring device mounting thread. The diameter of the axial center through hole (103) is not less than 5mm, and the material is Q345 steel. The metal gasket (104) is a ring structure with an inner diameter of not less than 10mm, an inner and outer diameter difference of not less than 10mm, a thickness of 1 to 2mm, and a material of pure copper or copper alloy.

3. The pressure measurement and protection device under strong radiation environment according to claim 1, characterized in that... The cone head (2) has a cone face apex angle θ ranging from 30° to 180°, a side cylindrical surface (202) height of not less than 50mm, a small diameter through hole (204) diameter of not more than 20mm, an internal thread (205) length of not less than 15mm, and a through hole with a diameter of not less than 20mm at the rear circular plane R / 2, which is perpendicular to the small diameter through hole (204); the connecting rod (203) has a diameter of not less than 50mm, a length of not less than 350mm, and is made of Q345 steel.

4. The pressure measurement and protection device under strong radiation environment according to claim 1, characterized in that... The through hole (302) of the variable diameter pressure guide head (3) has a diameter Φ ranging from 5mm to 15mm and is made of Q345 steel.

5. The pressure measurement and protection device under strong radiation environment according to claim 1, characterized in that... The outer diameter of the multi-stage composite spiral pressure guide pipe (4) is adjustable from 10mm to 40mm, the number of turns is adjustable from 3 to 8, and the material is Q345 steel.

6. The pressure measurement and protection device under strong radiation environment according to claim 1, characterized in that... The inner diameter of the cylindrical bottom surface of the buffer cavity (5) is not less than 230mm, the length is not less than 235mm, the diameter of the injection hole (502) is not less than 20mm, the hole is threaded with internal thread (503), the diameter of the two measuring device mounting holes (504) is not less than 20mm, the hole spacing is not less than 40mm, each mounting hole is threaded with internal thread, and the material is Q345 steel.

7. The pressure measurement and protection device under strong radiation environment according to claim 1, characterized in that... The length of the mounting cavity (6) is not less than 280mm and the outer diameter is not less than 130mm. The front end ring-mounted fixing plate has no less than 6 through holes (602) evenly distributed along the circumference, and the rear end ring-mounted fixing plate has no less than 4 through holes (603) evenly distributed along the circumference. The material is Q235 steel.

8. The pressure measurement and protection device under strong radiation environment according to claim 1, characterized in that... The diameter of the fixed flange (7) is not less than 130mm, the diameter of the central through hole (701) is not less than 30mm, and the material is Q235 steel.

9. The pressure measurement and protection device under strong radiation environment according to claim 1, characterized in that... The diameter of the plugging bolt (8) is not less than 20mm, the width of the wide-angle nut (801) is not less than 5mm, the thread (802) matches the thread (503) of the buffer cavity injection hole, and the material is Q235 steel.

10. The pressure measurement and protection device under strong radiation environment according to claim 1, characterized in that... The pressure-conducting damping material (9) is a liquid-fillable material.

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