Table of Content [Hide]

1. 1. Dynamic and static rings

2. 2. Elastic components (spring, corrugated plate, snake sleeve, etc.)

3. 3. Auxiliary seal (0-ring, v-ring, wedge ring and other special-shaped seal ring)

4. 4. Driving medium

5. 5. Fastener

1. Dynamic and static rings

The sealing surface shall be tightly adhered to prevent medium leakage. It is required that the moving ring and the static ring have good wear resistance. The moving ring can move axially and automatically compensate for the wear on the sealing surface of the component mechanical seal to make it fit well with the static ring. The static ring has buoyancy and plays a buffering role.

2. Elastic components (spring, corrugated plate, snake sleeve, etc.)

It mainly plays the role of compensation, pre - tightening and buffering, but also is the factor of auxiliary static seals sealing surface to produce a reasonable pressure. Elasticity is always required to overcome friction between the auxiliary seal and the drive, and the starter ring compensates. The material is required to be corrosion resistant.

3. Auxiliary seal (0-ring, v-ring, wedge ring and other special-shaped seal ring)

It mainly plays the sealing role of static ring and the moving ring, also plays the floating and the buffering role. The auxiliary sealing elements of the static ring are required to ensure the sealing between the static ring and the gland, so that the static ring has a certain degree of buoyancy. The auxiliary sealing element of the moving ring ensures the sealing between the moving ring and the shaft or shaft sleeve. The material shall be close to the medium in heat and cold resistance.

4. Driving medium

The parts of seal includes the transmission pin, the transmission ring, the transmission seat, the transmission sleeve, the transmission key, the transmission lug or the tooth inserts type coupling. Its function is to transmit the shaft torque to the moving ring. Materials shall be resistant to corrosion and wear.

5. Fastener

seal components include: set screw, spring seat, gland, assembly sleeve, shaft sleeve. It plays the positioning, fixation role of static ring and moving ring. Correct positioning is required to ensure that the friction pair sealing surface is in the correct position, and maintain a good fit of the spring specific pressure. At the same time , easy disassembly and assembly, easy positioning, repeat use is required. In the joint with the auxiliary seal, we shall pay attention to the chamfer angle and the pressure spring of the sealing ring. Pay special attention to corrosion and wear resistance in the movable ring seal ring and axle sleeve joint. If necessary, we can use hardfaced cladding.

For more information about mechanical seal parts and function and mechanical seal basics, please feel free to contact us!

As a professional mechanical seals manufacturer, Hangzhou Sealcon Fluid Machinery Co., Ltd has high-quality sealcon mechanical seals for sale. Welcome to contact us if needed.

In recent years, our country's economy continues to develop steadily, and at the same time, the demand for power supply is increasing continuously, and now the main channel of power production is the hydropower plant, so the hydropower plant is now closely connected with the people's life. Water turbine is an important part of hydropower plants. And as for water turbine, the main shaft seal is its indispensable component. But the main shaft seal is easy to fail, and its safety cannot be guaranteed, so it is a problem to be solved urgently in the current domestic hydropower industry. At present, the water turbines usually operate in high pressure and high-speed environment, which causes great pressure on the pump seals . The pump sealing parts of the turbine are easily worn by the sediment in the water, and the leakage often occurs, which makes the working efficiency of the water turbine decline rapidly and its reliability is also reduced, so regular sealing part replacement is needed. In view of this situation, the turbine shaft seal of the water turbine is invented, and it replaces the traditional sealing components of the water turbine, it can make the water turbine operate properly and improve the working efficiency and working quality of the water turbine.

Water turbine is a kind of energy conversion machine. It transforms the water energy into the mechanical energy of the rotating wheel by a certain way. After the mechanical energy is generated, the generator is driven by the rotation of the wheel to generate electric energy. The power of the water turbine comes from the water. Because of the characteristics of our country and the rivers, the sediment in the river is pretty much, especially in the rainy season, and a large amount of sediment will bring damage to the traditional sealing. Many sealing methods will have serious wear and tear after a period of time, thus affecting the seals’ normal use and the devices will begin to leak.

At present, there are two main classifications of water turbine main shaft seal:

(1) according to the nature of work, it can be divided into maintenance seal and working seal. There are many categories in the working seal, according to the seal structure, working seal can be divided into flat seal, disk seal, end seal, etc.;

(2) according to the structural division of water turbine main shaft seal, it can be divided into contact seal and non-contact seal. The non-contact seal includes reverse spiral seal and centrifugal seal.

As a professional mechanical seals suppliers, Hangzhou Sealcon Fluid Machinery Co., Ltd has high-quality sealcon mechanical seals for sale. Welcome to contact us if needed.

what is a balanced mechanical seal

The balance of the mechanical seal ring has a great influence on the sealing pressure of the contact surface. This sealing pressure depends on the effective cross-section of the seal itself and the pressure in the packing box. The section on the opposite side of the rotating face of the non-equilibrium mechanical seal ring is fully exposed to the pressure range of the packing box. This situation will make high pressure  between the sealing surface, which will make the working temperature increase, speed up the rate of wear. Under high temperature working conditions or liquid having greater corrosion and friction, it will greatly reduce the service life of mechanical seals.

balanced mechanical seal ring can reduce the sealing pressure and extend the service life of the seal. The main shaft and shaft sleeve with steps are generally adopted to reduce the effective section of the rotary surface, so as to achieve the above purpose. However, do not adjust the net sealing pressure to close to zero level, because this may cause the the unstable working condition between the sealing surface, and may blow the seal due to sudden changes.

The answer to these balanced seal problems may be an unbalanced seal, which may be better for some services. For example, in some applications, there may be more emphasis on the safety of liquid leakage than on the life of the seal. In this case, the selection of the seal may also be understood as the choice of a higher seal pressure. Similarly, in the case of a cooler liquid seal, the increase in operating temperature may be negligible.

Regardless of the consideration, it is generally recommended to use a balanced mechanical seal ring when the packing box pressure exceeds 50psi.

As a professional mechanical seals manufacturers, Hangzhou Sealcon Fluid Machinery Co., Ltd has high-quality sealcon mechanical seals for sale. Welcome to contact us if needed.

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The mechanical seal type multi spring can be used in a variety of elastomers and handle almost every kind of industrial liquid. All components are fixed together by snap ring with uniform structure design, which can be easily maintained on site.

Its scope covers: carbon mechanical seal of industrial pump, mixer and agitator seal, cylinder seal, metal bellows seal, automatic cooling pump seal and air conditioning compressor lip seal.

Carbon rings are widely used as sealing ring of carbon mechanical seal, because they have the following characteristics:

1. Self-lubricating

2. Corrosion resistance

3. Thermal expansion

4. Idling performance

5. Good thermal conductivity

6. Low friction coefficient

7. Excellent dimensional stability

8. High fatigue resistance.

Pure carbon graphite is used for sealing, it is usually impregnated with other materials, which can provide various materials to improve sealing effect by reducing porosity, improving wear performance or improving strength. It is widely used as one of the pair of end faces in most mechanical seals, but it is also the most popular material for segmented circumferential seals and piston rings under dry or small amount of lubrication.

With our extensive experience in the field of carbon products, we are able to manufacture and supply various carbon graphite sealing rings with the highest manufacturing accuracy. These seals are developed and designed by our experienced staffs with modern technology. We have the ability to manufacture seal rings of various sizes and grades, and customize products according to the details provided. These bolts are highly valued by industry experts and they can be used in various mechanical applications.

As a professional mechanical seal manufacture, Sealcon has high-quality sealcon mechanical seals for sale. Welcome to contact us if needed.