Industries & Applications

By utilizing our spring manufacturing technology that we have nurtured over the years,


we have solved a whole host of spring-related issues in various fields.

Power Plant Turbines

Other Places You Will Find Tokai Springs

Power Plant Turbines

High-precision springs sustain power plant turbines at the heart of energy production.

Electric power cannot simply be drawn from thermal or nuclear power as is. Rather, power generation requires a machine known as a 〝prime mover〟to convert heat energy into mechanical energy. In power plants, this crucial role is played by gas turbines and steam turbines, whose work is in turn supported by springs.

Energy from high pressure gas and high pressure steam, created by thermal and nuclear power, can only be transmitted to generators after it generates rotary motion through turbines. Turbines are machines containing bladed rotors which operate much like the vanes of a windmill. However, turbine rotors are not moved by the wind, but by high temperature, high pressure gas and steam created from an enormous amount of energy. To achieve efficient use of energy, turbines have to withstand enormous temperature and pressure. This task is performed by Tokai spring’s leaf springs. Acting as cushions for the contact between rotors turning at high speeds andcomponents components called 〝 seal rings 〟 which prevent steam leaks, these springs serve to protect turbines and achieve stable and enhanced power generation. People do not see flat plate springs often in their daily lives, but these springs play a crucial, behind the scenes to maintain our society’s energy supply.

What is a turbine?

Steam turbines and gas turbines are known as “prime movers”. Turbines have the function of converting various types of energy into mechanical movements. Passing through these turbines, high pressure gas or steam created by thermal or nuclear power can be converted into electricity.

Turbine

-Enhancing the performance of turbines-

Seal rings close off gaps in turbines and prevent the leakage of steam. This allows the flow of steam to be efficiently transmitted to the rotor blades, achieving efficient turbine performance.

-The key to seal rings! Leaf springs & disc springs-

Strong spinning motion can cause a rotor shaft to be misaligned. If this happens, the springs act as cushions to prevent heavy loads from being exerted even with zero contact between the rotor and seal ring.

 

Turbine

Clearance control for starting/stopping and load operation

The rotor’s optimum clearance in a turbine is different at starting, during and at stopping point of operation and an adjustment is essential at each point for maximum performance.

PROJECT STORY

Steam and gas turbine springs are consistently exposed to very high
temperatures. The maximum temperature a turbine spring can withstand is determined by the material used for the spring. There is a variety of heat-resistant steel materials available but only a small number of materials can satisfy the required properties to bend and
then recover its original shape. That is why Tokai spring is committed to continuously investing and researching in the development of new production technologies such as heat treatment methods which bring out the characteristics of a spring in normally heat-resistant steel, or whatever other performance properties our customers .

Brimming with Expertise Gained from Our Vast Track Record

Springs for power generation turbines are subject to extremely harsh usage environments, such as being exposed to high temperatures, and what’s more, the required spring characteristics must be highly accurate. For this, spring design and manufacturing requires various expertise. We propose designs to our customers that make the best use of our expertise cultivated from our extensive track record! I want to ensure the durability of my springs! I want to check the performance of my springs! I want a custom-made spring! I want you to make a prototype starting with a single spring! If you have any requests like those above, please feel free to contact us! In particular, based on our leaf spring design and manufacturing expertise nurtured through our experience with power generation turbines, we can solve the problem of leaf springs breaking even after many trials and any concerns you may have about how to fix leaf springs in place. We will also answer any questions you may have such as, ‘Is it possible to make a leaf spring with this kind of shape?’ and ‘What kind of methods do you use to make them?’ Click here to contact us.
Where Else Will You Find Our Springs?

Where Else Will You Find Our Springs?

• Gas and steam turbines
• Hydro turbines
• Substation disconnectors
• Fuel cells

Substation disconnector
Substation disconnector
Hydropower
Hydropower
Wind power
Wind power

  • Ideal for these clients
    Ideal for these clients
    • We would like you to examine the design according to our request.
    • We would like advice on springs used in heat resistant environments.
    • We would like you to check our springs that have been used for many years.
  • Why our springs are great for power generation and power plants
    Why our springs are great for power generation and power plants
    1. We can provide a detailed design that is tailored to your application.
    2. We enable design and manufacturing with special materials (heat resistance and corrosion resistance).
    3. We have a vast track record.
    4. We have a quality assurance system in place to ensure the traceability of material records, manufacturing records, and test records.
  • Features of Tokai Spring’s springs for power generation and power plants
    Features of Tokai Spring’s springs for power generation and power plants
    We boast a vast track record including the likes of heat-resistant leaf springs for power generation turbines, large compression springs for safety valves, and high-precision compression springs for safety devices.
    We have established a traceability system, and our springs play an active role in the electric power field, including nuclear power, where reliability is required.

Examples of Our Pursuit of Perfection

● Heat resistant compression spring for power generation turbines
  • ・The core of the power generation turbine is constantly exposed to high temperatures. Even under such conditions, it has stable spring characteristics and durability. The spring we are referring to is, of course, the compression spring for power generation turbines.
●High linear spring for thrust bearings
  • ・Thrust bearings are used at ultra-high pressures. This spring plays an active role in oil film control, which can be said to be the life of thrust bearings. We meet the demands of ultra-high precision and ultra-durability at a micron level in spectacular fashion.
●Compression springs for emergency circuit breakers
  • ・This spring looks like an ordinary small compression spring. But it is the last piece of the puzzle to controlling turbine speed. With its excellent responsiveness and resistance to fatigue, this little giant protects the turbine.
●Compression springs for switchgears
  • ・As this springs supplies generated electricity in a stable manner, even if the supply is usually erratic, when it comes to the crunch, this spring achieves smooth operation. This spring is made with this concept in mind.
●Turbine seal rings
  • ・Turbine seal rings are required to be very reliable in the face of severe operating conditions. We, therefore, guarantee to meet our customers’ demanding requirements with carefully selected materials and excellent manufacturing technology.
  • ・Because of the harsh usage conditions, we have prepared materials that best match these conditions. We will deliver proposals tailored to your usage conditions.
●Springs for turbine blade dampers
  • ・Turbine blades are the cornerstone of turbines. Our springs will firmly protect turbine blades at their base. Turbine blade damper springs – performing reliably even in high-temperature environments.

Examples of springs used in Power Generation and Power Plants

Application Spring Type Material
Nuclear pressure vessels

Disc spring SUP10
SKD61
Nuclear drive systems Disc spring SUP10
Nuclear fuel transportation containers Compression spring
Disc spring
SUS304
INCONELX750
Steam turbines (motors)

Compression spring
Fitting type springs
Disc spring
SUS304
INCONEL718
SUP10
SUP6
SWP-A
SUS304-WPB
Gas turbines

Compression spring
Disc spring
Flat spring
SUP10
INCONELX750

INCONEL718
SUS304
Hydropower SUP10
Electric power switchgears Compression spring
Fitting type springs
Torsion spring
Extension spring
Disc spring
SWP-A
SUS304-WPB
SUP10
SWOSC-V
SUS304
Electric power breakers Compression spring
Flat spiral spring
Fitting type springs
SUP10
SWP-A
SUS304-WPB
Electric power rectifiers Disc spring SUP10
Fuel cells Fitting type springs SUP10
Wind and hydropower machinery Compression spring
Extension spring
SWP-A
SUS304-WPB
Wind turbines Compression spring
Extension spring
SUP10
Electric power transformers Compression spring
Disc spring
SUP10
Electric power impedance transformers Compression spring SWOSC-V
SWP-A

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