Product Description

JMII Type Basic Diaphragm Coupling without Counterbore (JB/T9147-1999)

♦Description
JM Series Diaphragm Coupling of flexible metal flexible coupling, which relies on the metal diaphragm to transmit torque from the main connection, motivation, has the advantages of elastic damping and no lubrication, no noise, is an ideal product for replacing the gear coupling and coupling current. It can compensate for the axial, radial, and angular deviation caused by the manufacturing error, installation error, bearing deformation, and the change in temperature rise.

The main characteristics of JM Series Diaphragm Coupling:
1. Compensation two-axis misalignment of the ability, and tooth type coupling can be much more than a double angle displacement, radial displacement of the small, flexible, allowing a certain axial, radial, and angular displacement.
2. Obvious damping effect, no noise, no wear, and tear.
3. High transmission efficiency, up to 99.86%. Especially suitable for medium and high-speed high-power transmission.
4. Adapt to high temperature (-80+300) and harsh environments, and can be in shock, vibration, safety, and dynamic conditions.
5. Simple structure, lightweight, small size, convenient assembly, and disassembly. Without moving the machine can be disassembled (with intermediate type), with no need for lubrication.
6. Accurately convey the rotational speed, the operation has not turned bad, can be used for the transmission of precision machinery.

JM series diaphragm flexible coupling is widely used in the machinery and equipment industry, metallurgy, mines, petroleum, chemical, electric power, shipbuilding, lifting transport, textile, light industry, agricultural machinery, printing machinery, and water pump, fan, etc. in the transmission of power machine.

♦Detailed Pictures

♦Basic Parameter and Main Dimension

Note: N.m= Norminal Torque; r.min= Max speed of rotation; d.d1= Diameter of shaft hole;
Y L= Length of shaft hole; N.m/rad= Stiffness of torsion; kg.m²= Rotational inertia

♦Other Products List

♦Our Company

HangZhou CHINAMFG Machinery Manufacturing Co., Ltd. is a high-tech enterprise specializing in the design and manufacture of various types of coupling. There are 86 employees in our company, including 2 senior engineers and no fewer than 20 mechanical design and manufacture, heat treatment, welding, and other professionals.
Advanced and reasonable process, complete detection means. Our company actively introduces foreign advanced technology and equipment, on the basis of the condition, we make full use of the advantage and do more research and innovation. Strict to high quality and operate strictly in accordance with the ISO9000 quality certification system standard mode.
Our company supplies different kinds of products. High quality and reasonable price. We stick to the principle of “quality first, service first, continuous improvement and innovation to meet the customers” for the management and “zero defect, zero complaints” as the quality objective. 

♦Our Services
1. Design Services
Our design team has experience in Cardan shafts relating to product design and development. If you have any needs for your new product or wish to make further improvements, we are here to offer our support.

2. Product Services
Raw materials → Cutting → Forging →Rough machining →Shot blasting →Heat treatment →Testing →Fashioning →Cleaning→ Assembly→ Packing→ Shipping

3. Samples Procedure
We could develop the sample according to your requirement and amend the sample constantly to meet your need.

4. Research & Development
We usually research the new needs of the market and develop the new model when there is new cars in the market.

5. Quality Control
Every step should be a special test by Professional Staff according to the standard of ISO9001 and TS16949.

♦FAQ
Q 1: Are you a trading company or a manufacturer?
A: We are a professional manufacturer specializing in manufacturing various series of couplings.

Q 2: Can you do OEM?
Yes, we can. We can do OEM & ODM for all the customers with customized artworks in PDF or AI format.

Q 3: How long is your delivery time?
Generally, it is 20-30 days if the goods are not in stock. It is according to quantity.

Q 4: Do you provide samples? Is it free or extra?
Yes, we could offer the sample but not for free. Actually, we have a very good price principle, when you make the bulk order the cost of the sample will be deducted.

Q 5: How long is your warranty?
A: Our Warranty is 12 months under normal circumstances.

Q 6: What is the MOQ?
A: Usually our MOQ is 1 pcs.

Q 7: Do you have inspection procedures for coupling?
A: 100% self-inspection before packing.

Q 8: Can I have a visit to your factory before the order?
A: Sure, welcome to visit our factory.

Q 9: What’s your payment?
A: T/T.  

♦Contact Us

Web: huadingcoupling
Add: No.11 HangZhou Road,Chengnan park,HangZhou City,ZheJiang Province,China

Materials Used to Manufacture Diaphragm Couplings and Their Impact on Performance

Diaphragm couplings are manufactured using various materials, and the choice of material significantly impacts their performance in different applications. Here are some common materials used in diaphragm couplings and their impact on performance:

1. Metallic Alloys:

Stainless steel and other high-strength metallic alloys are widely used in diaphragm couplings. These materials offer excellent durability, high torsional stiffness, and resistance to wear and fatigue. They are well-suited for high-torque applications and environments with demanding operating conditions.

2. High-Temperature Alloys:

In applications where diaphragm couplings are exposed to elevated temperatures, specialized high-temperature alloys like Inconel and Hastelloy are used. These alloys can withstand extreme heat without losing their mechanical properties, making them ideal for use in industries such as steel processing and power generation.

3. Titanium:

Titanium is favored for its lightweight and excellent corrosion resistance. Diaphragm couplings made from titanium are commonly used in aerospace and marine applications where weight reduction and resistance to corrosive environments are critical.

4. Elastomers:

For certain applications that require vibration dampening and shock absorption, diaphragm couplings can be manufactured with elastomeric materials like rubber or urethane. These materials help reduce transmitted vibrations and can be found in pumps, compressors, and automotive drivetrain systems.

5. Non-Metallic Materials:

In situations where electrical isolation or non-magnetic properties are necessary, non-metallic materials like PTFE (Teflon) or polypropylene may be used. These materials are also highly resistant to chemical corrosion, making them suitable for certain chemical processing and semiconductor applications.

The choice of material impacts several aspects of diaphragm coupling performance, including:

• Torsional Stiffness: Metallic alloys and high-temperature materials provide high torsional stiffness, ensuring efficient torque transmission and accuracy in motion control applications.
• Corrosion Resistance: The selection of corrosion-resistant materials is crucial in applications where diaphragm couplings are exposed to corrosive environments, such as in marine or chemical industries.
• Temperature Resistance: High-temperature alloys enable diaphragm couplings to operate effectively in environments with elevated temperatures, such as steel processing or power generation plants.
• Weight: Materials like titanium offer lightweight advantages, making diaphragm couplings suitable for aerospace and other weight-sensitive applications.
• Vibration Damping: Elastomeric materials provide excellent vibration dampening properties, reducing vibrations and noise in certain applications.

Manufacturers carefully select the appropriate material based on the specific requirements of the application to ensure optimal performance and reliability of the diaphragm coupling in a wide range of industries.

Real-World Case Studies of Diaphragm Couplings in Engineering Projects

Diaphragm couplings have been successfully utilized in various engineering projects, providing reliable power transmission and addressing specific challenges faced by different industries. Here are some real-world case studies and success stories showcasing the effectiveness of diaphragm couplings:

1. Case Study 1: Pumping System in Wastewater Treatment Plant

In a wastewater treatment plant, a critical pumping system was experiencing frequent breakdowns due to misalignment issues and vibration-related failures. The plant engineers decided to replace the existing gear couplings with diaphragm couplings to address these problems. The diaphragm couplings’ flexibility allowed them to compensate for the misalignment caused by thermal expansion and pump impeller wear. Additionally, the couplings’ ability to dampen vibrations reduced stress on the pump bearings, resulting in extended maintenance intervals and increased overall system reliability. The successful implementation of diaphragm couplings in this project led to significant cost savings by minimizing downtime and reducing the need for frequent maintenance.

2. Case Study 2: Turbine-Generator Coupling in Power Plant

In a power generation plant, a large gas turbine-generator coupling required replacement due to excessive wear and fatigue-related failures in the previous coupling. The plant engineers opted for a high-performance diaphragm coupling with improved fatigue resistance and higher torque capacity. The flexibility of the diaphragm coupling allowed it to accommodate slight misalignments between the turbine and the generator during operation. This capability reduced the stress on the coupling and mitigated the risk of premature failure. The diaphragm coupling’s ability to handle torsional vibrations and dampen mechanical resonance further improved the overall reliability and performance of the turbine-generator system, resulting in increased power generation efficiency and reduced maintenance costs.

3. Case Study 3: Industrial Compressor System

In an industrial compressor application, the existing coupling experienced frequent failures due to misalignment and shock loads from varying compression demands. The plant engineers replaced the old coupling with a diaphragm coupling featuring high misalignment tolerance and excellent shock absorption properties. The diaphragm coupling’s flexibility effectively compensated for the misalignment between the compressor and the motor, resulting in smoother operation and reduced stress on the drive components. Additionally, the coupling’s ability to absorb sudden shock loads reduced the risk of equipment damage and minimized unplanned downtime. The successful implementation of the diaphragm coupling significantly improved the compressor system’s reliability and contributed to increased productivity in the industrial facility.

These case studies demonstrate the successful application of diaphragm couplings in diverse engineering projects, including wastewater treatment plants, power generation facilities, and industrial compressors. The flexibility, misalignment compensation, and vibration dampening properties of diaphragm couplings have proven to be valuable in addressing specific challenges and enhancing the performance and reliability of critical machinery in various industries.

Types of Diaphragm Couplings and Their Specific Applications

Diaphragm couplings come in various designs and materials, each suited for specific applications. Here are some of the different types of diaphragm couplings and their specific applications:

1. Metal Diaphragm Couplings:

Metal diaphragm couplings are the most common type and are often made of stainless steel or other high-strength alloys. They are used in a wide range of applications that require high torque transmission, precision, and reliability. Some common applications include:

• Industrial machinery such as pumps, compressors, and generators
• Motion control systems in robotics and automation
• Paper and printing machinery
• Machine tools and CNC equipment
• Marine and offshore equipment
• Aerospace systems
2. Elastomeric Diaphragm Couplings:

Elastomeric diaphragm couplings have a flexible diaphragm made of elastomeric materials like rubber or urethane. They offer vibration dampening properties and are suitable for applications that require shock absorption and noise reduction. Specific applications include:

• Pumps and compressors in HVAC systems
• Power transmission in agricultural machinery
• Automotive drivetrain components
• Small engine applications
• Medical equipment
3. High-Temperature Diaphragm Couplings:

These couplings are designed to withstand high temperatures, making them suitable for applications in extreme heat environments. They are commonly used in:

• Steel and metal processing industries
• Heat treatment furnaces
• Power generation plants
• Chemical processing equipment
• Glass and ceramic manufacturing
4. Non-Metallic Diaphragm Couplings:

Non-metallic diaphragm couplings are made from materials like polyurethane or other composites. They are often used in applications where electrical isolation or non-magnetic properties are required. Specific applications include:

• Electrical machinery and equipment
• Semiconductor manufacturing
• Food and beverage processing
• Pharmaceutical and biotechnology applications

Each type of diaphragm coupling offers unique features and advantages, making them suitable for various industries and applications. When selecting a diaphragm coupling, it’s essential to consider factors like torque requirements, misalignment tolerance, environmental conditions, and specific performance characteristics to ensure the coupling’s optimal performance in the intended application.

editor by CX 2023-10-07