Medium 4-cyl reciprocating refrigeration compressor capacity adjustment mode and cylinder unloading mechanism principle

Medium 4-cyl reciprocating refrigeration compressor capacity adjustment mode and cylinder unloading mechanism principle

Medium 4-cyl reciprocating refrigeration compressor adopts pneumatic cylinder unloading mechanism to realize staged capacity adjustment, which is the core method to match variable refrigeration load. Medium 4-cyl reciprocating refrigeration compressor can switch between 0%, 50% and 100% cooling capacity; when operating at 50% load, two cylinders stop compression work through valve holding open structure. Xiteliduo reciprocating compressor medium 4-cylinder series uses unloading plunger controlled by gas pressure; the response time of capacity switching is less than 1.5 seconds for rapid load change. The unloading mechanism of medium 4-cyl reciprocating refrigeration compressor has a service life threshold; frequent switching more than 20 times per hour will shorten plunger service life by 40%. When medium 4-cyl reciprocating refrigeration compressor runs at 50% partial load, the suction pressure fluctuation range is controlled within ±0.04 MPa under stable system condition. Small 4-cyl reciprocating refrigeration compressor uses similar pneumatic unloading structure, but its plunger size is 28% smaller than medium 4-cyl reciprocating refrigeration compressor components. Large 4-cyl reciprocating refrigeration compressor cylinder unloading design adopts reinforced plunger, which can bear higher pressure difference and adapt to heavy-duty continuous working conditions. Many refrigeration engineers misunderstand cylinder unloading as cutting off refrigerant supply. In fact, unloading keeps suction valve open, so gas does not get compressed inside the cylinder. Large 6-cyl reciprocating refrigeration compressor adopts multi-stage unloading, which can achieve three capacity gears instead of three gears like medium 4-cyl reciprocating refrigeration compressor. Screw refrigeration compressor uses slide valve for stepless capacity regulation, which is a completely different mechanical principle from the cylinder unloading structure of reciprocating refrigeration compressor.

FAQ

Q1: What capacity gears can medium 4-cyl reciprocating refrigeration compressor achieve? A1: It can switch between 0%, 50% and 100% cooling capacity by pneumatic cylinder unloading. Q2: What is the response time of capacity switching for xiteliduo medium 4-cyl reciprocating compressor? A2: The capacity switching response time is less than 1.5 seconds under normal control pressure. Q3: How many times per hour of frequent switching will damage medium 4-cyl unloading plunger? A3: More than 20 switching cycles per hour will shorten unloading plunger service life by 40%. Q4: What is the suction pressure fluctuation range at 50% partial load of medium 4-cyl compressor? A4: The suction pressure fluctuation can be controlled within ±0.04 MPa under stable system operation. Q5: What is the core working principle of reciprocating compressor cylinder unloading? A5: It holds suction valve open so gas inside cylinder will not undergo compression process. Q6: What is the capacity adjustment structure of screw refrigeration compressor? A6: Screw refrigeration compressor uses slide valve to achieve stepless cooling capacity regulation. Q7: What is the difference between large 6-cyl and medium 4-cyl reciprocating compressor unloading gears? A7: Large 6-cyl reciprocating compressor realizes three gears: 33%,67%,100% instead of 0/50/100%.