HRY2-220/2KW Sheath Heater
The HRY2-220/2KW you inquired about is a typical sheathed tubular electric heater. Its model designation usually represents: HRY series, type 2 structure, 220V voltage, 2KW power. The core feature of this heater is its split structure of "heating core + sheath", designed specifically for heating oil media such as hydraulic and lubrication oils.
⚙️ Core Structure and Working Principle
The essence of the HRY2 heater lies in its split isolation design:
Heating core: Inside is a high-temperature resistant alloy heating wire, filled with magnesium oxide powder for insulation, which is the actual heat source.
Metal sheath: The outside is a cold-drawn seamless steel pipe or stainless steel pipe, connected to the oil tank through a flange, completely isolating the heating core from the oil.
Heat transfer: Electrical energy → heating core → sheath → oil. This design increases the heat dissipation area, making the oil heating more uniform, avoiding the oil carbonization problem caused by local high temperatures in traditional immersion heating tubes.
The following are the general technical parameters for the HRY2-220/2KW model; specific dimensions may vary by manufacturer:
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Parameter Item Typical Value/Range Description
Rated Voltage AC 220V (single-phase) Suitable for small hydraulic stations without 380V power
Rated Power 2KW Surface heating power typically ≤ 2.0 W/cm²
Working Medium Mineral oil, hydraulic oil, lubricating oil Strictly prohibited for water, strong acids, strong alkalis, and other corrosive media
Operating Temperature ≤ 300℃ Recommended working temperature not exceeding 250℃ to extend lifespan
Working Pressure ≤ 0.8 MPa Suitable for atmospheric or low-pressure oil tanks
Installation Method Flange connection Need to confirm flange standard (e.g., HG/T 20592) and dimensions
Dimensions Length L ≈ 590mm Immersion length L1 ≈ 510mm, must confirm with manufacturer
Maintenance without oil drainage: This is the biggest highlight! When the heating core is damaged, there is no need to drain the oil tank; simply open the junction box, pull out the old core, and insert a new one, greatly reducing downtime and oil waste.
Anti-carbonization design: The sheath provides a large heat dissipation area, low surface load, preventing oil from coking or carbonizing due to local overheating, protecting hydraulic valve groups and oil lifespan.
Single-phase power supply: The 220V design allows easy connection to civil power for small machine tools and single-machine hydraulic stations, without the need to modify 380V circuits.
Safe and reliable: The sheath isolates the heating element from the oil, so even if the core insulation fails, it will not directly cause oil short-circuit or fire, providing higher safety.
Installation and Usage Safety Red Lines
Strictly prohibit dry burning: The effective heating section of the heater must be 100% immersed in oil. After installation, confirm the liquid level, and it is recommended to install a low-level protection switch to prevent dry burning due to oil level drop.
Medium matching: Only suitable for non-corrosive mineral oils without solid particles. Water, acid, or impurities will corrode the sheath or block heat transfer channels.
Reliable grounding: The equipment casing and junction box must be reliably grounded (grounding resistance ≤ 4Ω) to prevent electric leakage accidents.
Standard wiring: Use high-temperature resistant wires, ensure terminals are tightened to prevent heating or sparking due to poor contact. The junction box should be sealed to prevent oil and moisture ingress.
Shutdown logic: If the system has a circulation pump, follow the principle of "stop heating first, delay pump stop" to allow oil to continue circulating and carry away residual heat, preventing oil film carbonization on the sheath surface.
🏭 Procurement and Selection Suggestions
You are in Yangzhou, Jiangsu, located in the core industrial belt of electric heaters in the Yangtze River Delta (such as Yancheng, Zhenjiang, Changzhou), with a very mature supply chain, making procurement very convenient.
Essential information for inquiry:
Complete model: HRY2-220V/2KW
Installation dimensions: Flange specifications (outer diameter, hole spacing, thickness), total length L, immersion length L1 (preferably provide photos or drawings of the old part)
Medium type: Specify whether it is hydraulic oil, lubricating oil, or others
Explosion-proof requirements: If used in environments with flammable gases, the manufacturer must provide an explosion-proof certificate (e.g., Exd IIB T4)
Pitfall avoidance guide:
Dimension verification: HRY2 dimensions may vary among different manufacturers; do not order solely based on the model. Be sure to verify drawings or actual dimensions.
Material confirmation: Ask whether the sheath material is seamless steel pipe or stainless steel pipe, and the material of the heating core, as this directly affects lifespan and price.
Qualification check: Require the manufacturer to provide valid explosion-proof certificates (if needed) and 3C certification, and verify on the "National Certification and Accreditation Information Public Service Platform".
