Reverse water path constant-temperature valve element

Abstract

The invention discloses a reverse water path constant-temperature valve element which comprises a valve body, a piston, a temperature sensation element and a return spring, wherein a handle and a handle sleeve are mounted at the upper end of the valve body; a piston is connected with the temperature sensation element; the piston comprises a hot water control component, a cold water control component and a connecting section; the hot water control component is positioned at the upper part of the connecting section; the cold water control component is positioned at the lower part of the connecting section; a hot water baffle surface and a cold water baffle surface are arranged at the upper circumference of the inner wall of the valve body between a hot water inlet hole and a cold water inlethole; the hot water control component is arranged above the hot water baffle surface; the cold water control component is arranged below the cold water baffle surface; a hot water control surface isarranged at the lower end of the hot water control component; a hot water inlet channel is formed between the hot water control surface and the hot water baffle surface; a cold water control surface corresponding to the cold water baffle surface is arranged at the upper end of the cold water control component; a cold water inlet channel is formed between the cold water control surface and the coldwater baffle surface. By adopting the reverse water path constant-temperature valve element, reverse water inlet of cold and hot water can be achieved by improving the piston and the valve body.

Description

technical field [0001] The invention relates to a constant temperature valve core, in particular to a constant temperature valve core for an anti-water circuit. Background technique [0002] The thermostatic spool is a device that automatically adjusts the mixing ratio of cold and hot water so that the temperature of the mixed water can be kept at the set temperature automatically. The thermostatic valve core with side water inlet and water outlet at the lower end has a relatively fixed structure, that is, two water inlets are arranged axially at intervals from top to bottom on the side of the valve body, a mixed water outlet is arranged at the lower end of the valve body, and the outer side of the two water inlets is surrounded by Filter screen, handles and handle gloves, pistons and temperature sensing elements are installed in the valve body. The thermostatic spool is divided into positive water path thermostatic spool and reverse water path thermostatic spool. If the wa...

AI Technical Summary

Problems solved by technology

Although the spool achieves reverse water inlet, there are certain problems

[0004] 1. Problems arising from the use of memory alloy springs as heat-sensitive elements: 1. Compared with temperature-sensing elements, the higher price of memory alloy springs will increase the overall cost of the valve core

2. The cold and heat sensitivity of the memory alloy spring is different. The sensitivity to heat is strong, and it can be extended quickly when the temperature rises, but the sensitivity to cold is poor. When lowering, the memory alloy spring needs a long period of time to slowly retract so that the piston can move downward, thereby increasing the temperature of the mixed water

3. The expansion and contraction consistency of memory alloy springs is affected by the consistency of memory alloy internal organization. If the memory alloy itself does not reach a homogeneous state during production, it will lead to the sensitivity of different memory alloy springs produced by the same batch of memory alloy springs to temperature. Not the same, at the same time, the thermal expansion rate between the segments of the same memory alloy spring will also be different, which leads to poor stability and consistency of mass-produced memory alloy products, often resulting in unqualified products

First of all, the thermal expansion coefficient of the metal material itself is large. To ensure that the sliding between the two is not stuck in the low temperature state and the high temperature state requires a large sliding gap, but the large sliding gap cannot ensure that the inside of the valve core is in a relatively large position. The seal between the two at low temperature, and larger impurities will also enter the gap

Secondly, the hardness of metal materials is lower than that of ceramic materials. During use, there will inevitably be some small particles of impurities in the water. If metal materials are used to make the outer sleeve and inner sliding sleeve, these impurities will get stuck between the two. On the inner wall of the jacket or the outer wall of the inner jacket, it affects the sliding between the two, and at the same time destroys the inner wall of the jacket and the outer wall of the inner jacket, affecting the seal between the two

In addition, the chemical stability of metal materials is lower than that of ceramic materials. During use, metals are prone to oxidation and corrosion when they are in contact with water for a long time, resulting in changes in the inner diameter of the outer casing and the outer diameter of the inner sliding sleeve, affecting the normal operation of the outer casing and inner sliding sleeve. slide

[0007] In addition, the use of ceramic materials also has its disadvantages. Due to the high hardness and poor toughness of ceramic materials, it is difficult to process, has a high scrap rate, and the production cost is much higher than that of ordinary thermostatic valve core pistons. Can be used in small batches of high-end thermostatic faucets

Images