Because the traditional double-temperature ceramic valve is easy to cause instantaneous overheating scald due to the mistake of pulling the faucet by hand and the unstable change of cold and hot water pressure, it is difficult to control the water temperature. Therefore, an improved structure combining the cold and hot water balancing valve
inside the double-temperature ceramic valve has been developed by the relevant industry. At present, there are many patent cases concerning ceramic valve products with hot and cold water balancing valves and related technologies on the market. However, in general, there are still some problems and shortcomings that can not be overcome.
Generally speaking, the cold and hot water balancing valve consists of a fixed valve tube and a movable spool. The two ends of the fixed valve tube have perforations, and the two sides of the fixed valve tube have perforations respectively to guide cold and hot water. An inner groove is formed at each end of the movable spool. The two inner grooves are separated by a separator, and the two inner grooves are also provided with a vent to communicate with the vent provided by the fixed valve tube. With this configuration, when the cold and hot water flow respectively passes through the two side vents of the fixed valve tube and through the two inner grooves of the movable valve core, based on the principle of low velocity, low pressure and high velocity, the moving spool will move back and forth laterally with the change of velocity of cold and hot water flow. Furthermore, the cross-section area between the movable spool and the outlet on both sides of the fixed valve tube is changed to achieve the function and purpose of automatically balancing the temperature of cold and hot water.
However, the existing cold and hot water balancing valves still have the following problems in practical application:
1. When the user pulls the tap handle to the full hot water mode, the part of the cold water passing through the cold and hot water balancing valve will be completely blocked and the flow rate will stagnate. In this state, although the active spool in the hot and cold water balance valve will completely shift to the set end position due to the high pressure on the cold water side, so as to minimize the cross-section area of the hot water channel. However, the hot water can not be completely blocked and closed, that is to say, hot water will continue to flow out of the faucet through the hot water balance valve and along the hot water flow path of the ceramic valve, thus causing serious burns to users. Because most users will think that faucets with cooling and heat balance function should not be at risk of scalding. Therefore, it is easy to neglect the precise control of temperature when it is used safely. This highlights the safety problems and shortcomings of the existing cold and hot water balance valve structure design, which is an important technical issue that can not be ignored by the relevant industry.
2. On the other hand, once the traditional double-temperature ceramic valve is integrated with the structure and function of the hot and cold water balancing valve, when the user completely pulls the tap handle to the full cold water mode, the moving spool in the hot and cold water balance valve will almost close the cold water channel because of its displacement direction. Thus, the whole cold water supply function of the tap is greatly affected or even lost.
In view of this, the inventor, based on years of experience in manufacturing, development and design of related products, and in view of the above objectives, after detailed design and careful evaluation, will finally have a practical invention.