The cold and hot dual-purpose chiller is mainly comp […]
The cold and hot dual-purpose chiller is mainly composed of a refrigeration system, an air duct system, a structural system, and an electrical system. Valves are an important part of the refrigeration system, and the quality of their parts will indirectly lead to the quality of production. For this reason, we need to strictly control the quality of every link from planning, manufacturing, and inspection. The same day and the public introduced the analysis of the function, working principle and faults of the four-way valve of the chiller refrigeration system.
The cold and hot dual purpose chiller is divided into two parts:
The heating part and the cooling part can also be called a cold and heat integrated machine, which can realize mutual switching, accelerate the production schedule, reduce energy consumption, improve the molding compliance of products, restrain the defects of bad products, and avoid the occurrence of bad products.
The principle and fault analysis of the four-way valve of refrigeration in the cold and hot dual-purpose chiller.
(1) Function:
It is a key component in the cold and heat dual-purpose chiller. It plays the role of cooling and heating conversion in the refrigeration system. By replacing the exhaust pipe and return pipe of the compressor to enter the direction of the evaporator and condenser, the goal of cooling and heating can be reached. .
(two) working principle:
1. Structure: It is composed of three parts: pilot valve, main valve and solenoid coil. Beijing Chiller uses a pilot valve to control the main valve and adopts the pressure difference switching action to change direction. The four receivers of the four-way valve are: "D" port is connected to the compressor exhaust pipe, "E" port is connected to the low pressure valve, "S" port is connected to the compressor return pipe, and "C" port is connected to the condenser tube.
2. Working principle: When the solenoid coil is in the power-off state, the pilot slide valve moves to the left under the drive of the compression spring, and the high-pressure gas enters the capillary and falls into the piston cavity. On the other hand, the gas in the piston cavity is displaced due to the pressure difference between the two ends of the piston. The piston and the main slide valve move to the left, so that E and S receive the same, and D and C receive the same. The high pressure fluid of the air conditioning compressor flows into the right bowl cavity through the D and C capillary tubes, and the low pressure fluid from the left valve bowl cavity flows into the compressor through the E and S capillary tubes. The left and right valve bowls and valve blocks move to the left to form a refrigeration cycle.
When the solenoid coil is in the energized state, the pilot spool valve moves to the right under the magnetic force generated by the solenoid coil to restrain the tension of the compression spring. The high-pressure gas enters the capillary and falls into the piston cavity. On the other hand, the gas in the piston cavity is displaced due to the presence of the piston at both ends. Due to the pressure difference, the piston and the main slide valve move to the right, so that S and C receive the same, and D and E receive the same. The high pressure fluid of the air conditioning compressor flows into the left bowl cavity through the D and E capillary tubes, and the low pressure fluid from the right valve bowl cavity flows into the compressor through the C and S capillary tubes. The left and right valve bowls and valve blocks move to the right to form a heating cycle.