Views: 1924 Author: Site Editor Publish Time: 2024-10-15 Origin: Site
Everyone knows that a one-way rotary joint is just one end of the roller. Which hole is better for bidirectional rotary joints? To clarify these issues, we need to start with the structure of the rotary joint and the medium of circulation.
The installation of bidirectional rotary joints is because they are used to pass steam or are inconvenient to install unidirectional ones. Most steam rotary joints are designed to heat the rollers by inserting steam. After steam enters the roller through the rotary joint, it cools down and becomes condensed water. When the condensed water reaches a certain amount, it must be discharged, otherwise it will affect the temperature of the roller. This is also why steam rotary joints must be equipped with siphon tubes. Of course, there are also devices that use steam and do not require the discharge of condensate water. There are also devices that release water along with the product after the steam enters. Most of the equipment that uses rotating joints for securities installation needs to drain condensate water. Siphon tubes are installed on the inner teeth of the rotating joint housing. So, there is generally no suspense about steam rotary joints. All imports use holes next to the rotary joint. The inner teeth of the tail are connected to a siphon tube, while the outer teeth are connected to a drainage tube.
If a bidirectional rotary joint is used for water supply, it is mostly due to the need to install other things or space issues on the other end that the rotary joint cannot be installed. It doesn't really matter which inlet and outlet is used for the bidirectional rotary joint for water supply. The difference in the impact of fast inflow and outflow on temperature is not significant. If there must be a difference, it is that the water inflow is fast and the outflow is slow, and the water inside the roller will be full. When driving the roller with gears or relying on pulleys to rotate it, it is necessary to consider whether it can be moved. If the water inflow is slow and the water outflow is fast, the water inside the roller will be very little. The difficult problem to solve at this time is the constant temperature of the roller. The temperature difference between the two ends of the roller will be significant. And with more water, the temperature difference will be much smaller. Most rotary joints are installed with inner tubes that exceed half the length of the roller. If the water enters the inner pipe, the water temperature near the rotary joint will be higher, and the water temperature at the other end will be much lower. If the water enters through the adjacent hole and is discharged through the inner pipe, the temperature near the rotary joint will be lower, while the water temperature at the other end will be higher. In order to balance the temperature, the inner tube will be chosen to be smaller and the roller will be filled with more water. This is also why the inner tube of the rotary joint is two sizes smaller than the hole next to it.
The most difficult to decide which hole to use for entry and exit is the heat transfer oil rotary joint. The temperature of the heat transfer oil rotary joint is high, which can easily generate large temperature differences. The equipment that uses thermal oil rotary joints is generally high-efficiency and high-yield. The different heating methods can also affect the current situation of the inlet and outlet of rotary joints. The roller heated by a heating tube needs to have more in and less out. Otherwise, if there is no thermal oil inside the roller, it is easy to burn out the heating tube. In general, thermal oil rotary joints generally adopt a fast in and slow out method. There are more cases of using internal pipes for oil intake. To achieve temperature balance, holes of different sizes are drilled into the inner tube. Oil is pressurized using a pump valve. These are all aimed at ensuring a balanced inflow. It is difficult to control the balance of the roller by using the adjacent hole for oil inlet. If it is heated by a heating tube, it can be used. Some devices also install heating tubes into the inner teeth of the tail of the rotary joint housing. This way, the heating of the oil entering the adjacent hole will be balanced.
The selection of inlet and outlet for bidirectional rotary joints should be based on the requirements of different equipment and usage environments for the flow medium of the rotary joint. At present, except for the controversy over the lack of selection of inlet and outlet holes for steam rotary joints, there is basically controversy over everything else. Each holding one word. It's difficult to persuade the other party. The size of the inner tube of the bidirectional rotary joint and the size of the adjacent hole also determine the different choices of inlet and outlet for the rotary joint. So we need to judge based on our own usage, there is no unified format.