Anti-falling and anti-blocking radioactive gas-liquid sampling needle

Abstract

The utility model belongs to the technical field of radioactive gas-liquid sampling of nuclear power plants, and particularly relates to an anti-drop and anti-blocking radioactive gas-liquid sampling needle which comprises a needle seat, a connecting part, a needle tube and a sheath, the connecting part is arranged at the top end of the needle seat, the needle tube is connected with the connecting part, and the sheath wraps the needle tube and is used for protecting the needle tube; the top end of the needle tube is provided with an inclined needle tip cut, and the upper section is provided with a side hole. The needle base of the sampling needle is made of metal copper, the needle tube is made of 304 stainless steel, it is ensured that the needle base and an injector are fixed more firmly, the needle tube of the sampling needle is mechanically flared, and the needle tube and the needle base are transversely polished, so that the purpose of mechanically preventing the needle base and the needle tube from falling off is achieved, and it is ensured that the needle tube of the sampling needle and the needle base are not separated under the tensile force of 100 N or below. Meanwhile, the needle tube is provided with the side hole, so that the sampling pad cannot be blocked when the sampling pad is punctured, and the sampling efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of radioactive gas and liquid sampling technology in nuclear power plants, specifically relating to a radioactive gas and liquid sampling needle that is resistant to detachment and blockage. Background Technology

[0002] The water and gas in the primary loop and related systems of nuclear power plants are high-tritium, highly radioactive media, especially in heavy water reactor units where the tritium content in liquids and gases is high. Currently, water and gas sampling in the primary loop system of nuclear power plants is done using syringes with medical-grade needles, posing a risk of radioactive media leakage during the sampling process at nuclear power plants.

[0003] In existing technology, medical sampling needles are manufactured according to the GB15811-2001 standard. The national standard requires that the needle tip be subjected to a tensile force >45N. However, the tensile force range during sampling at nuclear power plants is 60N-80N. Under this force, there is a risk that the sampling needle tip will detach from the needle hub. Water and gas in the primary loop and related systems of a nuclear power plant are pressurized, highly radioactive media. If the needle tip detaches from the needle hub, highly radioactive water and gas will spray onto the sampling personnel and on-site equipment, posing a risk of environmental and equipment contamination, and even overdose to sampling personnel. Furthermore, medical sampling needles are designed with an angled tip, while samplers at nuclear power plants use rubber gaskets. If the angled needle pierces the gasket, there is a risk of the gasket puncturing and blocking the sampling needle, requiring replacement with a new needle and resampling, increasing sampling time and the workload on personnel. Utility Model Content

[0004] This invention proposes a radioactive gas-liquid sampling needle that is detachable and clog-resistant, to solve the problems of needle seat separation and needle tip blockage by gasket in the prior art.

[0005] The technical solution of this utility model:

[0006] This utility model proposes a radioactive gas-liquid sampling needle that is resistant to detachment and blockage. The sampling needle includes a needle seat, a connecting part, a needle tube, and a sheath. The needle seat has a connecting part at the top, and the needle tube is connected to the connecting part. The sheath wraps around the outside of the needle tube and is used to protect the needle tube. The top of the needle tube has an oblique needle tip cut, and the upper section of the needle tube has a side hole.

[0007] In some embodiments, the side hole is an elliptical side hole located 5 mm from the oblique needle tip cut, and the side hole is used to prevent the sampling needle from becoming blocked.

[0008] In some embodiments, the needle tube length is 42 mm, the needle tube outer diameter is 0.9 mm, and the oblique needle tip cut is a 17° bevel.

[0009] In some embodiments, the size of the elliptical side hole is 0.8*0.2mm.

[0010] In some embodiments, the connecting part is horizontally ground with a grinding tap, and the inner diameter of the inner hole matches the outer diameter of the needle tube.

[0011] In some embodiments, the inner hole of the connector is bonded to the needle tube by adhesive.

[0012] In some embodiments, the needle tube is made of stainless steel and the needle hub is made of pure copper plated with nickel.

[0013] In some embodiments, after the needle hub is installed on the needle tube, a conical flaring tool is used to flare the connection between the connecting part and the needle tube.

[0014] In some embodiments, the conical portion of the flared firing pin has a length of 12 mm and a bottom diameter of 0.12 mm.

[0015] The beneficial effects of this utility model are:

[0016] This invention proposes a radioactive gas-liquid sampling needle that prevents detachment and clogging. The needle hub is made of copper, and the needle tube is made of 304 stainless steel, ensuring a more secure fixation between the needle hub and the syringe. This invention employs mechanical flaring of the needle tube and transverse grinding techniques on the needle tube and hub to achieve mechanical anti-detachment, ensuring that the needle tube and hub will not separate under a tensile force below 100N. Simultaneously, a side hole is provided at the needle tube to prevent clogging during sampling and pricking, thus improving sampling efficiency. Attached Figure Description

[0017] Figure 1 A schematic diagram of an anti-detachment and anti-clogging radioactive gas-liquid sampling needle designed for this utility model;

[0018] Figure 2 This is a schematic diagram of the syringe of a radioactive gas-liquid sampling needle that is resistant to detachment and clogging according to the present invention.

[0019] Figure 3 This is a schematic diagram of the conical flared impact pin of a radioactive gas-liquid sampling needle that is designed to prevent detachment and blockage according to this utility model.

[0020] Figure 4 This is a schematic diagram of a grinding tap for a radioactive gas-liquid sampling needle that is resistant to detachment and clogging according to this utility model.

[0021] Figure descriptions: 1. Needle base; 2. Connecting part; 3. Needle tube; 4. Sheath; 5. Conical flared firing pin; 6. Grinding tap. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] like Figures 1 to 4As shown, this utility model proposes a radioactive gas-liquid sampling needle that is resistant to detachment and blockage. The sampling needle includes a needle base 1, a connecting part 2, a needle tube 3, and a sheath 4. The needle base 1 has a connecting part 2 at its top end. The needle tube 3 is connected to the connecting part 2. The sheath 4 covers the outside of the needle tube 3 and is used to protect the needle tube 3.

[0024] The needle tube 3 is made of 304 stainless steel to ensure sufficient strength. The needle tube 3 is 42mm long, with an outer diameter of 0.9mm and an inner diameter of 0.4mm. The oblique needle tip cut is at a 17° angle, and there is an elliptical side hole 5mm away from the oblique needle tip cut. The elliptical side hole has a main axis of 0.8mm and a secondary axis of 0.2mm. The side hole is used to prevent the sampling needle from getting clogged.

[0025] The needle hub 1 is made of pure copper plated with nickel, which has a greater tensile strength than the needle hub 1 made of polymer materials used in traditional disposable sterile sampling needles. This ensures that the needle tube 3 has sufficient strength. In addition, the pure copper plated with nickel has good ductility, which can ensure that the needle tube 3 and the needle hub 1 have a basic fixed tensile strength of over 100N. The connecting part 2 has its inner hole horizontally ground by a grinding tap 6. The inner hole diameter matches the outer diameter of the needle tube 3. The connecting part 2 and the needle tube 3 are bonded together with epoxy resin.

[0026] like Figure 3 As shown, after the needle tube 3 is fitted with the needle holder 1, a flaring process is added. After the needle tube 3 and the needle holder 1 are fixed with a press, a conical flaring pin 5 with a smaller inner diameter than the needle tube 3 is used to expand the opening at the connection between the connecting part 2 and the needle tube 3, ensuring that the sampling needle tube 3 and the needle holder 1 are physically fixed. The conical part of the conical flaring pin 5 has a length of 12mm and a bottom diameter of 0.12mm.

[0027] This utility model proposes a radioactive gas-liquid sampling needle that is resistant to detachment and clogging. The manufacturing method of this sampling needle is as follows:

[0028] The needle holder 1 is made of nickel-plated all-copper, with an inner diameter of 0.8mm. The needle tube 3 is made of 304 stainless steel, with an outer diameter of 0.9mm and a 17° bevel at the needle tip. An elliptical side hole with a main shaft diameter of 0.8mm and a secondary shaft diameter of 0.2mm is drilled 5mm from the bevel. Before assembling the needle tube 3 with the needle holder 1, a grinding tap 6 is used to horizontally grind the inner hole of the connecting part 2 of the needle holder 1 to match the outer diameter of the needle tube 3.

[0029] like Figure 2 As shown, a molding machine is used to press the connection part 2 between the needle tube 3 and the needle seat 1 to produce a sampling needle.

[0030] like Figure 3As shown, a conical flared impact needle is inserted into the center of the tail of the sampling needle hub 1 and impacts the center of the needle tube 3 with a pressure of 1-5 MPa to expand the outer diameter of the needle tube 3 inside the needle hub 1, thereby fixing the needle hub 1 and the needle tube 3 so that the needle tube 3 cannot detach from the needle hub 1 towards the needle tip.

[0031] The embodiments of this utility model have been described in detail above. This utility model is not limited to the above examples. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model.

Claims

1. A radioactive gas-liquid sampling needle that prevents detachment and clogging, characterized in that, The sampling needle includes a needle seat (1), a connecting part (2), a needle tube (3), and a sheath (4). The connecting part (2) is provided at the top of the needle seat (1). The needle tube (3) is connected to the connecting part (2). The sheath (4) wraps around the outside of the needle tube (3) and is used to protect the needle tube (3). The top of the needle tube (3) is a slanted needle tip cut, and the upper section of the needle tube (3) is provided with a side hole.

2. The radioactive gas-liquid sampling needle for preventing detachment and clogging according to claim 1, characterized in that, The side hole is an elliptical side hole located 5 mm from the oblique needle tip cut, and the side hole is used to prevent the sampling needle from becoming blocked.

3. The radioactive gas-liquid sampling needle for preventing detachment and clogging according to claim 2, characterized in that, The needle tube (3) is 42mm long and has an outer diameter of 0.9mm. The oblique needle tip cut is 17°.

4. The radioactive gas-liquid sampling needle for preventing detachment and clogging according to claim 3, characterized in that, The elliptical side hole has a main axis of 0.8 mm and a secondary axis of 0.2 mm.

5. A radioactive gas-liquid sampling needle for preventing detachment and clogging according to claim 4, characterized in that, The connecting part (2) is horizontally ground by a grinding tap (6), and the diameter of the inner hole matches the outer diameter of the needle tube (3).

6. The radioactive gas-liquid sampling needle for preventing detachment and clogging according to claim 5, characterized in that, The inner hole of the connecting part (2) is bonded to the needle tube (3) by adhesive.

7. The radioactive gas-liquid sampling needle for preventing detachment and clogging according to claim 1, characterized in that, The needle tube (3) is made of stainless steel, and the needle seat (1) is made of pure copper plated with nickel.

8. The radioactive gas-liquid sampling needle for preventing detachment and clogging according to claim 7, characterized in that, After the needle tube (3) is installed with the needle seat (1), a conical flaring pin (5) is used to flare the connection between the connecting part (2) and the needle tube (3).

9. A radioactive gas-liquid sampling needle for preventing detachment and clogging according to claim 7, characterized in that, The conical flared firing pin (5) has a conical part length of 12mm and a bottom diameter of 0.12mm.

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