0 Preface In hyperbaric oxygen therapy, the body is placed in a high-pressure environment within the hyperbaric oxygen chamber, so that the patient's breathing and ambient oxygen pressure is the two important aspects of the hyperbaric oxygen therapy in the air pressure chamber. Whether or not the patient is effectively inhaling oxygen in a high-pressure environment is the core link of hyperbaric oxygen therapy. The application of DK800-6 rotameter has objectively ensured that the patient can observe oxygen effectively. Oxygen-based oxygen supply (on-demand oxygen supply) and continuous oxygen supply two different ways of oxygen supply, DK800-6 rotameter has played a qualitative and quantitative indication role, in its clinical application of how fast and convenient It is also worth exploring to conduct maintenance. 1 Clinical Application of DK800-6 Rotameter With the continuous expansion of the application of hyperbaric oxygen therapy and the innovation and innovation of oxygen-absorbing terminals, the oxygen supply mode has evolved from the original single lung oxygen supply to two types of pulmonary oxygen supply and continuous oxygen supply. Therefore, the DK800-6 rotameter has also been used in clinical applications. One is the conventional usage, that is, DK800-6 rotameter is applied to lung oxygen supply. This usage can be conveniently and intuitively observed on the flow meter. The main observation is the oxygen inhalation and the instantaneous flow rate of the patient's oxygen inhalation. If the instantaneous flow is small or absent, the patient's mask is not wearing well. Where there is a leak in the contact part of the mask, the cabin operator will use this kind of observation to instruct the patient in the cabin to correct the bad situation in time and ensure effective oxygen absorption. The second is to expand usage, that is, DK800-6 rotameter is used for continuous oxygen supply. The flowmeter can be used as both a switch and a flow regulator to quantitatively adjust the flow rate. The operator can adjust the size of the oxygen supply flow by observing the size of the oxygen-absorbing terminal balloon in the chamber. This use of the flowmeter can ensure effective suction. Oxygen, but still need to pay close attention to the air tightness of the patient's oxygen inhalation terminal, so as to avoid oxygen leakage caused by high oxygen concentration in the cabin. Both uses of the DK800-6 rotameter solve the oxygen demand and oxygen inhalation problems of various patients, benefiting more patients. 2 Common Faults and Maintenance of DK800-6 Rotameter The DK800-6 Rotameter has almost no fault in the normal usage, because this usage has no operation on the flowmeter and is used statically; in the extended usage of the flowmeter, it is a dynamic use, during the treatment process, the patient At the beginning of the oxygen inhalation and the mid-stop oxygen absorption (rest) and the adjustment of the size of the oxygen supply flow, the flowmeter must be operated. In this dynamic use, the flowmeter is prone to failure, and its common faults and maintenance are summarized as follows: 2.1 DK800-6 rotameter closes tightly This failure is due to the fact that the flowmeter knob is turned off (rotate the flowmeter knob clockwise until tight), the steel ball (rotor) in the flowmeter glass tube is still floating, and a smaller flow indication can be seen with the naked eye. The root cause of this fault is the conical adjustment screw of the flowmeter, and the interface with the sealing ring on the back, and the interface of the adjustment seat of the front center with the small cylinder of the neck is poorly jointed. Because this joint surface is a rigid joint, the improper use of the switch knob can easily cause damage to the grinding joint surface and cause closeness. The zero sandpaper can be used to maintain the tapered joint of the adjusting screw and the neck of the adjusting seat. The round hole joint surface of the cylinder is ground by rotating method. Generally, rotation of 30 to 50 turns enables the joint surface to be joined well to repair this fault. This method can be carried out about 3 or 4 times. Once the small cylindrical cylinder on the adjustment base is flattened, it can't be repaired by grinding with sandpaper. In practice, we use a rigid-flexible method for re-repair with good results. The specific method is: Take the rubber tube of the sphygmomanometer cuff (outer diameter 8mm, internal diameter 4mm), cut a small section 5mm, this section of the rubber tube can be very Suitably placed in a rigid fixed sleeve between the adjusting seat and the adjusting screw, this sleeve has exactly an internal rim of about 3 mm, which allows the rubber tube to be tightly fitted on the internal rim, the protruding portion of the rubber tube being about 2 mm, on the external screw The fastening of the cap is just tightly engaged with the adjustment seat. This rubber tube not only functions as a rubber pad seal, but also transforms the rigid joint of the original adjustment seat and the adjustment screw into a rigid and soft engagement, so that the closure is not tight. The problem is solved more completely. This innovative maintenance can also improve the switching performance of the flowmeter. The switch is light and the failure of the flowmeter can no longer be closed for a long time until the rubber tube is deformed and replaced. 2.2 DK800-6 rotameter cannot be opened This failure phenomenon is that the flow meter turns on without indication of flow (the rotor in the flowmeter glass tube does not float), causing the root cause of this failure. One is that the external nut of the flowmeter knob is not tight enough (loose), so that the inner core of the rotameter rotates along with the adjusting screw, so that the flow cannot be turned on. This condition is often accompanied by the maximum point of the knob. The closing point disappears. No matter if the knob is turned left or right, it will not turn to the head. Sometimes the outer cap will leak, and tightening the outer nut with a wrench can eliminate this failure. The other is that the fastening screw between the knob and the adjustment screw is loose, which can cause the knob to not drive the screw to rotate. In this case, it is easy to feel that the knob slides on the adjustment screw, and that the knob can be adjusted from the adjustment screw by just one tap. The upper slides off, so re-align the locked position of the knob and adjusting screw. Tighten the locking screw on the knob with a screwdriver. The fault can be eliminated. 2.3 DK800-6 Rotameter Cannot Adjust Flow Rate This fault phenomenon is that after the flowmeter adjustment knob opens the flow to a certain amount, it cannot continue to open a large flow, and even if the flowmeter adjustment knob is turned on to the maximum position, the flow does not rise or fall. The root cause of this failure is that the metal sheet in the center of the pressure sensitive diaphragm in the respirator of the respiratory terminal falls off. It was originally moved downwards by the plane of the metal sheet, forming a complete lock. The situation of the top-opening of the rocker valve has changed, and the current metal sheet may have changed. Ectopic or tilted so that the rocker valve is not in the state where it was originally locked fully open, but in a semi-open or throttled state, as the flow is opened, the rocker valve has not been locked, and As the pressure in the lower chamber of the pressure-sensing diaphragm increases, the pressure-sensing diaphragm bulges, causing the rocker of the rocker valve to lift and the opening of the valve to become smaller, which in turn increases the throttle of the valve. This is also the flow meter adjusting knob is turned on. The reason why the traffic flow does not rise in the maximum position. From the oxygen flow point of view, oxygen flows first through the flowmeter mounted on the outboard console, and then through the respiratory device installed in the inboard breathing terminal. The adjustment of the patient's respiratory flow utilizes the principle of throttling the flowmeter. Adjust the size of the flow meter by adjusting the size of the flow meter. Now there is a throttling in the downstream stage of the flowmeter due to a fault, when the throttling of the flowmeter is more severe than the throttling at the fault of the respirator (such as the flowmeter is turned on from the closed state and the adjustment in the smaller flow range), The size of the status flow can be adjusted at the flow meter, otherwise it is not adjustable. This shows that the flowmeter adjustment knob can no longer adjust the flow after the flow is adjusted to a certain value. The root cause of the fault is not on the flowmeter, but the fault phenomenon is reflected in the flowmeter. We have encountered in the work. This kind of situation is used to share with everyone. 3 Summary The DK800-6 rotameter is a conventional component of the oxygen supply system for hyperbaric oxygen chambers. With the expansion of the hyperbaric oxygen therapy field and the application of the continuous oxygen supply method, the DK800-6 rotameter has evolved from a single static use to the present. Dynamic and static use, its role is also played by a single oxygen flow quantitative observation of quantitative observation and indication of oxygen flow, oxygen flow on demand adjustment and oxygen flow valve switching a variety of purposes, so its rapid failure, Accurate judgment, as well as simple, fast, convenient, and reliable repair, have practical significance for improving the occupancy rate of cabins and effectively controlling the oxygen concentration in the cabin and ensuring the safety of oxygen chambers. May this maintenance experience can provide reference for peers.
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