Sharing of assembly and inspection methods for compressors in industrial cold water systems

1. Inspection parts

After inspecting in accordance with the replacement standard of spare parts, proceed assembling in the reverse order of disassembly, and pay attention to the following points:

1. All spare parts and repaired parts should be inspected to see if there is any damage and rust on the surface; spare parts and crankcase should be cleaned with hydrocarbon oil, gasoline, etc., dried and coated with refrigerated oil or butter.

2. All parts should be coated with refrigerating machine oil before assembly.

3. It is not advisable to use woolen fabric to scrub spare parts.

4. The sealing gasket should be coated with refrigerating machine oil before installation;

5. When tightening the nut, apply force symmetrically and evenly.

6. The removed cotter pin is not allowed to be used again and must be replaced with a new one.

2. Assembly of cylinder liner components

1. Place the cylinder liner on a clean soft surface workbench and install the rotating ring. The notch of the rotating ring should face down, and pay attention to the left and right points.

2. Install washer and elastic ring, check the movement of rotating ring should be flexible.

3. Stand the cylinder sleeve upright and install the ejector rod so that the round head of the ejector rod falls into the notch groove of the rotating ring.

4. Level the ejector rod, that is, place the suction valve on the ejector rod. The ejector rods should be able to be lifted up or down freely at the same time, and the distance between the ejector rod and the suction valve plate is equal, and the error is not more than 0.1mm.

5. Lift up the ejector rod and set the ejector spring. Compress the ejector pin spring and install a split pin on the ejector pin.

6. Turn the rotating ring to check the flexibility of the ejector pin.

Third, the assembly of the piston connecting rod group

1. Put the small head bushing into the small connecting rod head, and put the small connecting rod head inside the piston body. Pay attention to the direction of the oil groove when assembling the small connecting rod bushing.

2. Put the spring retaining ring into the groove of the piston pin seat at one end, and check the numbers of the piston and connecting rod to prevent incorrect installation.

3. Insert the piston pin into the piston pin hole and the small head bushing hole, and the rotation should be flexible. If it is difficult to install the piston pin, the piston can be immersed in water or oil at 80-100°C and heated for 5-10 minutes, and then the piston pin can be installed and tapped lightly with a wooden stick. If the ambient temperature is low, the piston pin should also be slightly heated. This is to avoid that the piston and the piston pin have different expansion coefficients due to different metal materials. If the temperature difference between the pin and the piston is large, the local heat transfer in the insertion hole will be faster, and it will not wait. After the piston pin is installed, the piston pin seat hole shrinks sharply and cannot be installed.

4. Use wire cutters to put another spring retaining ring into the groove of the piston pin seat hole.

5. Put the gas ring and oil ring into the piston ring groove, the assembly method is opposite to the disassembly method.

6. For the small end of the connecting rod with needle roller bearings, before assembling, first install the clamp ring and needle roller into the bearing housing, and then push the guide sleeve in. When assembling, use an elastic retaining ring for one hole, and use needle-nose pliers into the groove of the small head hole. Use the method of heating the small head to install the bearing retainer ring and needle roller bearing into the small head hole, and then put it People bearing the retaining ring, and then install another hole with an elastic retaining ring.

7. Count the remaining parts (connecting rod big-end bearing bush, connecting rod big-end cap, connecting rod bolt pin, connecting rod nut, split pin, etc.) for general assembly.