What Is a Piston Ring Compressor?

Piston Ring is a metal ring that is embedded in the groove of the piston. There are two types of piston rings: compression ring and oil ring. The compression ring can be used to seal the combustible gas mixture in the combustion chamber; the oil ring is used to scrape excess oil from the cylinder.

Application range

Piston rings are widely used in various power machinery, such as

Identification of the quality of the piston ring

The working surface of the piston ring must not be scratched, abraded, or peeled off. The outer cylindrical surface and the upper and lower end surfaces should have a certain smoothness. The curvature deviation should not be greater than 0.02-0.04 mm. The standard sinking amount of the ring in the groove must not exceed. 0.15-0.25 mm, the elasticity and clearance of the piston ring meet the requirements. In addition, you should also check the light leakage of the piston ring, that is, lay the piston ring flat inside the cylinder, put a small light gun under the piston ring, put a light shield on it, and then observe the light leakage gap between the piston ring and the cylinder wall. This shows whether the contact between the piston ring and the cylinder wall is good. Under normal circumstances, the thickness of the piston ring light leakage gap measured with a thickness gauge should not exceed 0.03 mm. The length of the continuous light leakage slit should not be greater than 1/3 of the cylinder diameter, the length of the light leakage gap should not be greater than 1/3 of the cylinder diameter, and the total length of some light leakage slits should not exceed 1/2 of the cylinder diameter, otherwise, it should be replaced.

Piston ring marking requirements

The piston ring marking GB / T 1149.1-94 stipulates that all piston rings requiring installation direction should be marked on the upper side, that is, the side close to the combustion chamber. The rings marked on the upper side include: tapered face ring, inner chamfer, cut-out table ring, nose ring, wedge ring and oil ring with the required installation direction. The upper side of the ring is marked.

Piston ring precautions

Pay attention when installing the piston ring

1) The piston ring is inserted into the cylinder liner, and there must be a certain opening clearance at the interface.

2) The piston ring should be installed on the piston. In the ring groove, there should be a certain edge clearance in the height direction.

3) The chrome plated ring should be installed in the first line, and the opening should not face the direction of the vortex pit on the top of the piston.

4) The piston ring openings are staggered at 120 ° C from each other and are not allowed to face the piston pin holes.

5) Piston ring with conical section, the conical surface should be upward when installing.

6) Generally, when installing the torsion ring, the chamfer or cut groove should be upward; when installing the anti-torsion ring with a tapered surface, keep the tapered side up.

7) When installing the combination ring, first install the axial lining ring, and then install the flat ring and wave ring. A flat ring is installed on the top and bottom of the wave ring, and the ring openings should be staggered from each other.

Material of piston ring

1.Abrasion resistance

2, oil storage

3.Hardness

4.Corrosion resistance

5.Intensity

6, heat resistance

7, flexibility

8.Cutting performance

Among them, wear resistance and elasticity are the most important. High-power diesel engine piston ring materials are mainly gray cast iron, ductile cast iron, alloy cast iron, and compacted graphite cast iron.

Piston connecting rod assembly

The main points of the diesel generator piston rod assembly are as follows:

First, press the copper sleeve of the connecting rod. When installing the copper sleeve of the connecting rod, it is best to use a press or a vise to avoid hitting it with a hammer. The oil hole or oil groove on the copper sleeve must be aligned with the oil hole on the connecting rod to ensure its lubrication

2. Assemble the piston and connecting rod. When assembling the piston and connecting rod, pay attention to their relative positions and directions.

Three, cleverly installed piston pin. The piston pin and the pin hole are interference fits. During installation, first place the piston in water or oil and heat it to 90 ° C ~ 100 ° C evenly. After taking it out, place the pull rod in the appropriate position between the holes of the piston pin seat, and then install the piston pin coated with organic oil in the predetermined direction. Into piston pin hole and connecting rod copper sleeve

Fourth, the installation of the piston ring. When installing piston rings, pay attention to the position and sequence of each ring.

Fifth, install the connecting rod group. ^[2]