ZB scroll compressor configuration

ZB scroll compressor configuration Compressor model; built-in pressure relief valve; exhaust temperature protection; exhaust check valve; motor protector; midpoint protector ZB15-ZB48; ZF09-ZF18; IPR; TOD has a midpoint protector ZB58-ZB114; None; ASTP has key protectors Built-in pressure relief valve (IPR valve) The built-in pressure relief valve is located between the high-pressure side and the low-pressure side of the compressor, and opens when the pressure difference between the high-pressure side and the low-pressure side exceeds 26 to 32 bar. When the built-in pressure relief valve opens, the hot exhaust gas contacts the temperature-sensitive part of the motor protector, and the motor midpoint protector trips. At this time, the three-phase winding of the motor is open, and the compressor must be sufficiently cooled before the motor midpoint protector is reset. ZB58KQ~ZB114KQ do not have a built-in pressure relief valve. In order to ensure safe operation, a high-pressure switch with a set pressure not exceeding 30 bar (gauge pressure) should be configured in the system in any application. The internal temperature protector OD or ASTP is a temperature-sensitive quick-acting valve plate installed in the vortex exhaust port. When the exhaust temperature is too high, he will open the high temperature exhaust and return to contact the motor protector, thereby protecting the compressor. Small running time Scroll compressor There is no definite answer as to how many times it can be started and shut down in an hour, because it largely depends on the system configuration. Because the scroll compressor is started under unloading conditions, even under unbalanced pressure, it is started under unloading conditions, so there is no minimum stop time. The most critical consideration is the minimum operating time required to return oil to the compressor after startup. The simplest measurement method is to use a prototype with a glass sight glass (provided by Emerson), and connect the longest connecting tube allowed by the system. The shortest running time is the time it takes for the compressor to return to the compressor oil sump to restore the normal oil level in the sight glass when the compressor starts to lose oil. If the compressor is cycled at a time interval shorter than this time, for example, to protect very precise temperature control, it may cause a gradual loss of lubricating oil and damage the compressor.