一种指示器下置的隔爆型限位开关
By placing the indicator at the bottom and using a rotating shaft sealed connection and an aluminum alloy housing design, the problems of multiple sealing interfaces and poor sealing performance of traditional explosion-proof limit switches are solved, thereby improving sealing performance and safety and ensuring the stability and reliability of the limit switch.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI ST HANS PNEUMATIC VALVE ACTUATORS MAKER CO LD
- Filing Date
- 2025-08-27
- Publication Date
- 2026-07-17
AI Technical Summary
Traditional explosion-proof limit switches with top-mounted indicators have multiple sealing interfaces and poor sealing performance. They are prone to aging and failure of seals due to vibration and temperature changes, increasing the risk of flammable gas or dust leakage and making it difficult to meet the safety requirements of high-risk industrial scenarios.
The indicator is positioned below the housing, and the shaft is sealed to the housing to reduce the sealing interface. Stable support is provided by the mounting base and bracket, and the use of a flexible sealing ring and aluminum alloy housing improves sealing performance and structural stability.
It effectively improves the sealing performance and safety of explosion-proof limit switches, reduces the risk of leakage, ensures the accuracy of limit switch status indication and structural stability, and extends service life.
Smart Images
Figure CN224519732U_ABST
Abstract
Claims
1. An indicator recessed flameproof limit switch characterized by, The device includes a housing, which is hollow to form a cavity. A mounting base plate is fixedly installed inside the cavity. An indicator is installed below the housing. A rotating shaft connected to the actuator shaft head is installed in the middle of the indicator. The rotating shaft is fixedly connected to the indicator. The rotating shaft passes through the lower end face of the housing and the mounting base plate in sequence and extends into the cavity. The rotating shaft and the mounting base plate are rotated together. The rotating shaft is sealed to the housing.
2. The flameproof limit switch with a sub indicator as claimed in claim 1 wherein, A mounting bracket is provided on the section of the shaft between the housing and the indicator.
3. An indicator recessed flameproof limit switch as defined in claim 2 wherein, The housing consists of an upper housing and a lower housing, which are fixedly connected by bolts; the mounting bracket is fixedly connected to the lower housing.
4. The explosion-proof limit switch with an indicator located below, as described in claim 3, is characterized in that... A first annular groove is provided on the section of the rotating shaft located between the lower housings, and a first sealing ring is arranged in the first annular groove, and the rotating shaft and the lower housing are sealed together.
5. The flameproof limit switch with a submersible indicator as claimed in claim 3, characterized in that, The upper end face of the lower housing is provided with a second annular groove for installing the second sealing ring near the edge.
6. An indicator recessed flameproof limit switch as defined in claim 1 wherein, The housing is made of aluminum alloy.
7. The flameproof position-limiting switch with a below-indicator according to claim 3, characterized in that, The lower housing is provided with a wiring port.