Automatic aligning structure of valve core
By adopting the automatic center of centering of the valve core in the gate valve, the combination of the ball head valve, the fixed pressure plate and the activity valve core solves the problem of complexity of the existing gate valve on high accuracy requirements. The sealing and flow adjustment effects are reduced, and the accuracy requirements and inspection complexity are reduced.
Patent Information
- Application Number
- CN202421267198.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-06-05
AI Technical Summary
During assembly and use, existing gate valves have high requirements for machining accuracy and assembly accuracy, and the valve core shape and position tolerance detection is complex and the indirect measurement accuracy is low, which affects the sealing and flow adjustment effect.
Adopt the automatic center of the valve core, through the combination of the ball head, the fixed pressure plate, and the activity valve core, to form a spherical cavity, realize the activity hinge connection of the valve stem and the valve core, eliminate the offset of the valve core and the valve body body The influence of cooperation.
It improves the sealing and flow regulation effect, reduces the requirements for processing accuracy and simplifies the inspection process, reduces internal leakage and wear, and prolongs the service life.
Smart Images
Figure CN222416099U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of valves, and particularly relates to an automatic center-adjusting structure for a valve core. Background Art
[0002] According to the different valve cores, the existing gate valves are mainly divided into rigid gate valves and elastic gate valves. Figure 1 As shown in the figure, when the rigid gate valve is closed, the valve stem moves downward and relies on the valve core sealing surface and the valve body sealing surface to be highly smooth, flat and consistent, and fit each other to prevent the medium from flowing through, and relies on the top wedge to increase the sealing effect. The elastic gate valve uses the pressure generated by the transmission thread M between the valve stem and the valve bonnet to cause the contact surface between the elastic valve core and the valve body to undergo elastic deformation, thereby achieving mutual fit and sealing.
[0003] The valve core and valve stem of the existing gate valve are rigidly connected. The center lines of the valve stem and the valve seat assembly hole must be completely overlapped to achieve lifting, opening and closing. If the center line overlap is deviated, torque will be generated, causing jamming, and even affecting the fit of the valve core and the valve seat, increasing leakage. Although increasing the clearance between the valve core and the valve body can provide a margin to ensure fit, the increase in clearance will inevitably increase the internal leakage when half-open, affecting the flow regulation effect. Therefore, the above two types of gate valves have high requirements for machining accuracy and assembly accuracy.
[0004] Moreover, although the detection of valve core shape and position tolerance is relatively convenient, the assembly hole and sealing surface of the valve body are both in the inner cavity, and their shape and position tolerance need to be measured indirectly. The detection process is complicated, and the indirect measurement accuracy is also lower than that of direct measurement. Utility Model Content
[0005] In order to overcome the deficiencies of the prior art, the utility model provides a valve core automatic center-adjusting structure with good sealing performance, good throttling effect and low manufacturing cost.
[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the structure of the utility model is: a valve core automatic centering structure, including a ball head valve stem, a fixed pressure plate, and a movable valve core. The ball head valve stem passes through the center hole of the fixed pressure plate, and the ball head at the bottom of the ball head valve stem falls into the center hole at the bottom of the fixed pressure plate. The bottom of the fixed pressure plate is fixed to the top of the movable valve core. An arc-shaped groove is provided on the inner side of the center of the top of the movable valve core, and an arc-shaped groove is provided on the outer side of the center hole of the fixed pressure plate. The two arc-shaped grooves are fitted at both ends of the ball head of the ball head valve stem to form a spherical cavity.
[0007] The bottom of the pressure plate is further fixed to the top of the movable valve core by connecting screws.
[0008] The utility model first installs the ball valve stem into the fixed pressure plate, and then uses 4 connecting screws to evenly distribute the fixed pressure plate around the circumference. The arc groove outside the center hole at the bottom of the fixed pressure plate is connected to the arc groove inside the center of the top of the movable valve core to form a spherical cavity, and the movement of the ball head at the bottom of the ball valve stem is limited in the spherical cavity. At the same time, it can ensure that it can swing freely, forming an automatic center-adjusting structure, so that the connection between the valve stem and the valve core is changed from a traditional rigid connection to a movable hinge connection, eliminating the influence of the valve stem offset on the matching of the valve core and the valve body. Under the action of the valve core automatic center-adjusting mechanism, the center line between the ball valve stem and the movable valve core still does not affect the fit between the movable valve core and the valve body when there is a small deflection angle β, so the movable valve core and the valve body can be grinded and formed, and fit freely. The fit is significantly higher than that of the existing gate valve, so the sealing is better, and the shape and position tolerance is eliminated at the same time. The quality inspection does not need to detect the shape and position tolerance, which simplifies the inspection process and reduces the processing accuracy requirements.
[0009] The utility model discloses the ...
[0010] The utility model provides a valve core automatic centering structure, which is used to eliminate the influence of valve stem deviation on the cooperation between the valve core and the valve body, thereby improving the sealing and flow regulation effect, while also reducing wear, increasing service life, reducing processing accuracy requirements and simplifying the inspection process. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 Background technology Rigid gate valve and elastic gate valve structure diagram
[0012] Figure 2 This is a schematic diagram of the structure of the utility model
[0013] Figure 3 This is a schematic diagram of the structure of the utility model when the structure is deflected at an angle of β Specific embodiments
[0014] like Figure 2 , 3As shown, a valve core automatic centering structure includes a ball head valve stem 2-1, a fixed pressure plate 2-4, and a movable valve core 2-5. The ball head valve stem 2-1 passes through the center hole of the fixed pressure plate 2-4, and the ball head at the bottom of the ball head valve stem 2-1 falls into the center hole at the bottom of the fixed pressure plate 2-4. The bottom of the fixed pressure plate 2-4 is fixed to the top of the movable valve core 2-5 by a connecting screw 2-3. An arc groove is provided on the inner side of the center of the top of the movable valve core 2-5, and an arc groove is provided on the outer side of the center hole of the pressure plate 2-4. The two arc grooves are fitted at both ends of the ball head of the ball head valve stem 2-1 to form a spherical cavity, which limits the movement of the ball head of the ball head of the ball head valve stem 2-1 within the spherical cavity to form an automatic centering structure.
[0015] Under the effect of the present invention, when there is a small deviation angle β between the center lines of the ball valve stem 2-1 and the movable valve core 2-5, it still does not affect the fit between the movable valve core 2-1 and the valve body 2-2. Therefore, the movable valve core 2-1 and the valve body 2-2 can be grinded into shape, eliminating form and position tolerances. Quality inspection no longer needs to detect form and position tolerances, which simplifies the inspection process and reduces the machining accuracy requirements. There is no need to reserve an active gap, which effectively reduces internal leakage and improves the flow regulation effect.
Claims
1. A valve core automatic centering structure, comprising a ball head valve stem, a fixed pressure plate, and a movable valve core, characterized in that: The ball head valve stem passes through the center hole of the fixed pressure plate, and the ball head at the bottom of the ball head valve stem falls into the inner center of the bottom of the fixed pressure plate. The bottom of the pressure plate is fixed to the top of the movable valve core. An arc groove is provided on the inner side of the center of the top of the movable valve core, and an arc groove is provided on the outer side of the center hole of the pressure plate. The two arc grooves are fitted at both ends of the ball head of the ball head valve stem to form a spherical cavity.
2. The valve core automatic center-aligning structure according to claim 1, characterized in that: The bottom of the pressure plate is fixed to the top of the movable valve core through connecting screws.