What are the technical requirements for mechanical seal rings?

The sealing ring is the general name of the moving ring and the static ring (the same below), which is the most important component of the mechanical seal. The sealing ring largely determines the performance and life of the mechanical seal, therefore, some requirements are put forward for it.

1. Have sufficient strength and stiffness.

It is not damaged under working conditions (such as pressure, temperature and sliding speed, etc.), and the deformation should be as small as possible, and the sealing can still be maintained when the working conditions fluctuate. In particular, the sealing end face should have sufficient strength and a certain corrosion resistance to ensure that the product has a satisfactory service life.

2. Good thermal shock resistance.

For this reason, the material is required to have a high thermal conductivity and a small coefficient of linear expansion, so that it does not crack when subjected to thermal shock.

3. Small coefficient of friction.

The seal ring matching should have a small coefficient of friction.

4. Good self-lubrication.

If a short period of dry friction occurs during work, the sealing end face will not be damaged. Therefore, the sealing ring should have good self-lubrication, and the sealing ring material and sealing fluid should also have good wettability.

5. Simple structure.

The structure of the sealing ring should be simple and symmetrical, and the integral structure should be preferred, or the combined (such as inlayed) sealing ring can also be used, and the spraying structure of the sealing end face should be avoided as much as possible.

6. The sealing ring should be easy to process and manufacture.

Installation and maintenance should be easy and inexpensive.

Technical requirements for mechanical seal rings:

The sealing ring is a kind of annular seal with a notch in Henan Dashan non-ferrous metal, which is placed in the ring groove of the sleeve, the sleeve rotates together with the shaft, and the sealing ring is pressed against the inner hole wall of the stationary part by the elasticity of the notch being pressed, which can play the role of sealing. Each contact surface is hardened and polished. The sealing ring is made of chromium-containing wear-resistant cast iron and can be used at sliding speeds of less than 100 ms; If the sliding speed is within the range of 60 to 80m s, the sealing ring can also be made of tin bronze.

The sealing ring is a kind of metal ring (also known as mouth ring) embedded on the pump casing at the inlet of the impeller, which is used to prevent abrasion between the impeller and the pump casing, and its form is straight and face sealed. The advantage of the face seal type is that the leaked water flows out along the radial direction, and compared with the straight type flowing out along the axial direction, the water flow state at the inlet of the pump is improved, and the efficiency of the non-ferrous metal water pump in Henan Dashan is improved.

Summary. What is the material of the dynamic and static ring of the mechanical seal?

Hello dear, the material of the seal of the non-leakage magnetic pump is generally fluorine rubber, and the PTFE material is used in special cases; The material configuration of the dynamic and static ring of the mechanical seal is more critical, not the cemented carbide is good for the cemented carbide, the highest is on the one hand, and the two have no hardness difference and it is not reasonable, so they are treated differently according to the characteristics of the medium.

Our pumps are often made of PVDF and FRPP materials, so our sealing rings can also be changed according to the different pump materials, for example, our PVDF pumps use VT material sealing rings, and our FRPP pumps use NBR materials.

What is the material of the dynamic and static ring of the mechanical seal?

What is the general material of the dynamic and static ring of the mechanical seal, the material of the non-leakage magnetic pump seal is generally fluoroelastomer, and the PTFE material is used in special cases; The material configuration of the dynamic and static ring of the mechanical seal is more critical, not the cemented carbide is good for the cemented carbide, the highest is on the one hand, and the two have no hardness difference and it is not reasonable, so they are treated differently according to the characteristics of the medium. Our pumps are often made of PVDF and FRPP materials, so our sealing rings can also be changed according to the different pump materials, for example, our PVDF pumps use VT material sealing rings, and our FRPP pumps use NBR materials. Hope it helps.

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The sealing ring is the most important and effective means to solve the leakage problem of the hydraulic system. If the sealing ring of the hydraulic system is defective, the sealing ring may not allow external leakage, and the leakage of oil will pollute the environment; It may also cause air to enter the suction chamber, affecting the working performance of the hydraulic pump and the smoothness of the movement of the hydraulic actuator. Therefore, the reasonable selection and design of the sealing ring device is very important in the design of the hydraulic system, and the requirements for the sealing ring device are as follows:

1.The sealing ring should have good sealing performance within a certain range of working pressure and temperature, and can automatically improve the sealing performance with the increase of pressure.

2.The friction between the sealing ring device and the moving parts should be small, and the friction coefficient should be stable.

3.The sealing ring has strong corrosion resistance, is not easy to age, has a long working life, good wear resistance, and can be automatically compensated to a certain extent after wear.

4.The structure is simple, easy to use and maintain, so that the sealing ring has a longer life.

The choice of sealing ring material is of great significance to its sealing performance and service life. The properties of the material directly affect the performance of the sealing ring. NBR Nitrile Rubber Seal:

It is suitable for use in petroleum-based hydraulic oil, glycol-based hydraulic oil, diester lubricating oil, gasoline, water, silicone grease, silicone oil and other media. It is currently the most versatile and lowest-cost rubber seal. Not suitable for use in polar solvents such as ketones, ozone, nitrohydrocarbons, MEK and chloroform.

The general operating temperature range is -40 120 . It is an axially acting elastic rubber sealing ring that is used as a pressure-free seal for the rotating shaft. The sealing lip has good mobility and adaptability, can compensate for large tolerances and angular deviations, can prevent internal grease or oil leakage, and can also prevent the intrusion of splash water or dust from the outside.

The friction pair of the mechanical seal of the water pump rotates at high speed while bearing a certain pressure to prevent the corrosiveness of the medium and the change of temperature. Therefore, the requirements for materials have the following aspects: 1. Mechanical properties:

It has high elastic modulus, strength and allowable PV value, low friction coefficient and linear expansion coefficient, excellent wear resistance and self-lubrication, and good impermeability. 2. Corrosion performance: It has a good chemical shape and can prevent damage caused by corrosion, abrasion, dissolution and swelling of the medium.

3. Thermal performance: it has good thermal conductivity, heat resistance, cold resistance and adaptability to temperature mutations. The commonly used non-metallic materials for friction pairs are:

carbon graphite, ceramics, PTFE and plastics, etc.; Commonly used metal materials are: cemented carbide, nickel-chromium steel, chromium steel, bronze, carbon steel and cast iron.

Requirements for Sealing Rings:

The sealing ring is a kind of Henan Dashan non-ferrous metal annular seal with a notch, which is placed in the ring groove of the sleeve, the sleeve rotates together with the shaft, and the sealing ring is pressed against the inner hole wall of the stationary part by the elasticity of the notch, which can play the role of sealing. The surface of the non-ferrous metals in contact with Henan Dashan needs to be hardened and polished. The sealing ring is made of chromium-containing wear-resistant cast iron and can be used at sliding speeds of less than 100 ms; If the sliding speed is within the range of 60 to 80m s, the sealing ring can also be made of tin bronze.

The sealing ring is a kind of metal ring (also known as mouth ring) embedded on the pump casing at the inlet of the impeller, and its non-ferrous metal function in Henan Dashan is to prevent abrasion between the impeller and the pump casing, and its form is straight and face sealed. The advantage of the end seal type is that the leaked water flows out along the radial direction, and compared with the straight type flowing out along the axial direction, the water flow state at the inlet of the pump is improved, and the efficiency of the non-ferrous metal pump in Henan Dashan is improved.

1) The flatness of the sealing end face is not greater than that of three monochromatic optical interference bands); The roughness of the end face of the hard material seal is not greater than the Ra value; The roughness of the end face of the soft material seal is not greater than the Ra value; There should be no cracks, scratches, porosity and looseness on the surface that affect the performance of use.

2) The parallelism of the sealing face of the sealing ring in contact with the auxiliary sealing ring is GBT T1184Class 7 accuracy regulations in 1996.

3) The perpendicularity between the end face of the sealing ring and the inner (or outer) circular surface of the auxiliary sealing ring should be according to GB T11841996 Grade 7 accuracy regulations.

4) The surface roughness of the contact part between the sealing ring and the auxiliary sealing ring ra. The value is not greater than; The outer or inner bore size tolerance is h9 or h9.

The sealing ring is a kind of annular seal with a notch, which is pressed against the inner hole wall of the stationary part by the elasticity of being pressed and plays a sealing role.