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Structure design of a new hand-held liquid nitrogen cryotherapy device

Time: 2019-06-06 10:34 Source: unknown Author: Bander liquid nitrogen tank Click: second
The purpose of this paper is to design and develop a new hand-held liquid nitrogen cryotherapy device with high infusion pressure, strong refrigeration effect, safe and reliable use, convenient operation, wide application range, small evaporation loss of liquid nitrogen and beautiful appearance.

For this reason, some structural design schemes are adopted, such as selecting high pressure and high quality stainless steel vacuum insulation thermos bottle as liquid storage bottle, changing the traditional open storage mode of liquid nitrogen at atmospheric pressure to closed pressure storage mode, using pull rod plunger jet valve to control the delivery of liquid nitrogen, using thin-wall stainless steel pipe to make infusion jet pipe, and screw type lengthening cold probe rod. Self pressurized liquid nitrogen tank

The specifications of the above liquid storage bottles are 500rid or 350ml. Above the bottle mouth, a stainless steel bottle cap with internal thread is made, which is screwed on the brass thread tightly matched with the outer edge of the bottle mouth, and a silicone rubber 0-type sealing ring is filled between the cap and the screw thread end face, so as to prevent air leakage between the bottle cap and the screw thread end face. According to the measurement, this kind of stainless steel vacuum insulated thermos bottle can bear the pressure of more than 0.1 MPa, and the maximum working pressure of the cryotherapy device is not more than 0.06 MPa. A safety valve (also a vent valve) is installed on the bottle cap. When the pressure in the bottle exceeds 0.06 MPa When MPa, the safety valve can automatically open to vent and reduce pressure, and lifting the valve stem by hand can release gas and relieve pressure urgently. Therefore, there will be no explosion accident of liquid storage bottle, so as to ensure the safety and reliability of treatment during use.

The valve stem of the top of the valve rod is fixed on the top of the valve rod by the spring of the top of the bottle Under the action of the rod, the rod will lift the valve rod, and the injection valve will open. At the lower end of the injection valve seat, an infusion pipe extending to the bottom of the liquid storage bottle, a cold probe rod and a spray pipe are inserted and welded.

The front end of the cold probe rod is welded with the front end for screwing various types of freezing heads. When the injection valve is opened, under the action of the pressure stored in the bottle, liquid nitrogen along the infusion pipe, through the injection valve, from the injection pipe in the cold probe rod at the outlet of the injection valve, sprays to the freezing head to cool it.

The liquid nitrogen ejected from the injection pipe exchanges heat with the vaporized nitrogen vapor of the freezing head, and is vented from the exhaust pipe welded on the pipe wall behind the cold probe rod and the external plastic pipe in the interlayer between the injection pipe and the cold probe rod. The infusion pipe, cold probe rod, jet pipe and exhaust pipe are all made of thin-walled stainless steel pipe. The diameter of infusion pipe and jet pipe is relatively large, so as to facilitate the large liquid nitrogen flow in the tank and prevent the spray pipe from being blocked by ice crystal and dust. The front end of the cold probe rod is specially equipped with a head cover which is used to spray liquid nitrogen from the cold spray needle. Figure 1 shows the photo of Yu-2 hand-held pressure storage liquid nitrogen cryotherapy device and accessory box. Self pressurized liquid nitrogen tank

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