Direct-Acting Electric Valve With Fixed Rotor and Screw Drive
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Solution Overview
Problem
Conventional direct-acting control valves require large motors to manage large valve ports, leading to increased size, cost, and inconvenience in mounting and detaching, while also experiencing reduced driving force due to rotor misalignment during operation.
Innovation Solution
A direct-acting electric valve design where the axial positions of the rotor and valve seat are fixed, allowing the screw rod to be directly rotated by the motor, converting rotation into axial movement of the valve core to open or close the valve port, eliminating the need for a gear system and reducing power loss, with a balancing passage to minimize resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a direct-acting control valve uses a large motor to open and close a large-diameter valve port, then the driving force is sufficient, but the size of the control valve becomes excessively large and the cost increases
Solution Approach 1:
The valve body is divided into multiple segments or sections, allowing the large-diameter valve port to be constructed from smaller components. This segmentation enables the use of a smaller motor while still achieving the required valve port area, thus reducing the overall size of the control valve without compromising driving force requirements.
Solution Approach 2:
The invention transitions from a single large-diameter valve port design to a multi-port configuration arranged in different spatial dimensions. By distributing the flow capacity across multiple smaller ports rather than one large port, the system can use a smaller motor while maintaining the required total flow capacity, thereby reducing valve size.
2Ease of operation
If a conventional direct-acting control valve uses a screw rod fixed to the rotor, then the valve can open and close, but the rotor position changes during operation reducing driving force
Solution Approach 1:
An intermediary component (such as a bearing or support structure) is introduced between the rotor and the screw rod to maintain proper alignment. This intermediary ensures that the rotor remains at the axial center of the coil component during operation, preventing position changes that would reduce driving force, while still allowing the valve to open and close effectively.
Solution Approach 2:
The design creates a stable, equipotential position for the rotor by providing proper support and alignment mechanisms. This ensures the rotor maintains its optimal position relative to the coil component throughout operation, maintaining consistent driving force without requiring complex adjustment mechanisms.
3Adaptability or versatility
If a pilot control valve is used to open the main valve port, then the valve can control flow, but the opening area increases sharply causing sharp flow changes
Solution Approach 1:
The valve port is segmented into multiple smaller ports rather than one large port. This segmentation allows for more gradual and precise control of the opening area, preventing sharp increases in flow when the valve opens. Each smaller port can be controlled independently or collectively, providing finer adjustment precision while maintaining the required flow control capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the operation of large-diameter valve ports using a smaller motor, reducing the overall size of the valve body, enhancing responsiveness, and maintaining consistent driving force, thus meeting the requirements of minimization and large capacity.
Implementation Method 1
a motor (10), and a screw rod (312)... the axial positions of the rotor (12) of the motor (10) and the valve seat (30) are fixed with respect to each other... the screw rod (312) is rotated by the rotor (12)
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A direct-action-type electrically-operated valve comprises a valve base (30) provided with a valve cavity, a motor (10) disposed on the upper end the valve base, and a screw rod (312). The screw rod (312) is fitted and connected to a nut (41) by means of threads. The nut is connected to a spool (42). Axial positions of a rotor (12) of the motor and the valve base are relatively fixed. The upper end of the screw rod is fixedly connected to the rotor. Driven by the nut, the spool moves along the axial direction of the valve cavity to open or close a valve opening (30a) disposed on the valve base. The spool is a tubular structure provided with a balancing channel, and a seal piece for dividing the valve cavity into two independent cavities is disposed on the periphery of the spool. A gear system is removed from the electrically-operated valve, so that unnecessary rotations are reduced, friction loss is reduced, and a response is direct, reliable and sensitive; the axial positions of the rotor and the valve base are relatively fixed, that is, the relative fixation of the rotor and a coil element during the working enables driving force to be stable; and obviously, for valve openings with a same size, the size of the motor using the valve opening is smaller than that in the background technology, which can meet requirements of miniaturization and large capacity.