Capacity Control Valve With Dynamic Bypass Blocking
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Solution Overview
Problem
The existing capacity control valve configuration for variable displacement compressors experiences decreased operating efficiency due to increased refrigerant circulation when the auxiliary communication passage allows refrigerant flow from the control port into the suction port during continuous operation.
Innovation Solution
A capacity control valve design featuring a pressure sensitive valve member with an intermediate communication passage and a slide valve body that partitions the pressure sensitive chamber, allowing controlled communication between the control and suction ports to prevent refrigerant flow into the suction port during normal operation and facilitate quick pressure reduction at startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the auxiliary communication passage allows communication between control port and suction port, then the responsiveness at startup is improved, but the operating efficiency decreases due to increased refrigerant circulation
Solution Approach 1:
The patent applies the dynamics principle by making the auxiliary communication passage dynamically controllable through a solenoid valve. The valve body can shift positions based on pressure differential and solenoid actuation, opening the auxiliary passage during startup for rapid pressure equalization, then closing it during normal operation to prevent energy loss from unnecessary refrigerant circulation. This dynamic switching resolves the contradiction between startup responsiveness and operating efficiency.
2Productivity
If the main valve is closed to lower control chamber pressure at maximum capacity, then the discharge amount is maximized, but the refrigerant flows into suction port through auxiliary passage causing efficiency loss
Solution Approach 1:
The patent uses the solenoid-controlled valve body as an intermediary element between the control port and suction port. When the main valve is closed for maximum capacity operation, the solenoid actuates to position the valve body in a way that blocks the auxiliary communication passage, preventing refrigerant from flowing into the suction port. This intermediary control mechanism allows the system to achieve maximum discharge amount without the energy loss that would otherwise occur through the auxiliary passage.
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
This design enhances the fluid discharge function at startup and improves the operating efficiency of the variable displacement compressor by preventing refrigerant circulation and allowing differential pressure to quickly lower the control pressure.
Implementation Method 1
a valve body driven by a solenoid, and a main valve seat which is provided between the discharge port and the control port and with which the valve body is allowed to come into contact
Implementation Method 2
the fluid of high pressure flows from the outside of the capacity control valve into the Pc side space of the pressure sensitive chamber through the control port to generate a differential pressure between the Pd side space and the Pc side space, and the slide valve body is slid to the discharge port side using the differential pressure
Data Source
AI summary
A capacity control valve includes a valve housing. A main valve including a valve body is driven by a solenoid, and a main valve seat which is provided between a discharge port and a control port and with which the valve body 51 is allowed to contact. A pressure sensitive valve member forming a pressure sensitive valve with a pressure sensitive body is disposed in a pressure sensitive chamber. The control port and a suction port communicate through an intermediate communication passage by opening the pressure sensitive valve. A slide valve body slides relative to the pressure sensitive valve member to open and close a through-hole communicating with the intermediate communication passage. The slide valve body partitions the pressure sensitive chamber into a Pd side space and a Pc side space, and a Pd-Pc flow passage providing communication between two spaces and is formed in the slide valve body.