Several large refrigeration unit installation methods and steps!
1. Basic inspection and acceptance
Check the quality of the foundation together with the civil engineering, supervision and construction units, and conduct intermediate handover after confirmation .
2. Leveling in place
According to the construction drawings, the vertical and horizontal center lines of the equipment foundation are ejected according to the positioning axis of the building, and the equipment is hoisted to the equipment foundation with a forklift and a herringbone pole for placement. It should be noted that the direction of the nozzle of the equipment should meet the design requirements, and the levelness of the equipment should be adjusted to a level close to the requirements. Use flat or inclined horns to initially level the equipment. The placement position and quantity of the horns meet the equipment installation requirements.
(1) After the initial leveling of the equipment is qualified, the anchor bolt holes should be grouted for a second time, and the grade of fine stone concrete or cement mortar used should be 1 to 2 grades higher than the foundation strength grade. Before grouting, the dirt, soil and other debris in the hole should be cleaned. Each hole must be grouted in one go, rammed in layers, and the bolts held upright. The anchor bolts can be tightened only when the strength reaches more than 70%.
(2) After the equipment is finely leveled, the pad iron should be spot welded in time. The gap between the equipment base and the surface of the foundation should be filled with concrete, and the pad iron should be buried in the concrete. The upper surface of the grouting layer should be slightly sloped to prevent oil and water. Flowing into the base, the plastering mortar should be dense and the surface should be smooth and beautiful.
(3) Use the plumb line method of the spirit level to measure the machining surface of the cylinder, the base or the base plane, and precisely level the equipment, so that the allowable deviation of the vertical and horizontal horizontality of the fuselage is 1‰, and it should meet the equipment technology document requirements.
(1) For refrigeration compressors with oil seals, only the cylinder head, piston, cylinder inner wall, suction and exhaust valves and crankcase should be removed and cleaned within the time limit specified in the equipment technical documents and if the appearance is good, and there is no damage or rust. Check whether all fasteners and oil passages are unobstructed, and replace the lubricating oil in the crankcase. For units filled with protective gas or refrigerant, if the inflation pressure does not change within the time limit specified in the equipment technical documents, and the appearance is intact, the internal cleaning of the compressor may not be performed.
(2) The site to be dismantled and cleaned should be clean and equipped with fire prevention equipment. When the equipment is disassembled, it should be carried out in sequence, and each part should be marked to prevent it from being reversed during assembly.
(3) When cleaning with gasoline, a layer of oil must be applied after cleaning to prevent rust.
(1) The basic inspection, in-situ leveling and initial leveling methods of screw refrigeration units are the same as those of piston refrigeration units. The longitudinal and lateral horizontal deviations of the unit installation should not be greater than 1‰, and should be installed on the base or the processing surface parallel to the base. Measurement.
(2) Loosen the coupling between the motor and the compressor, jog the motor, and check whether the rotation direction of the motor meets the requirements of the compressor.
(3) After the grouting strength of the anchor bolt holes meets the requirements, the equipment is finely leveled, and the dial indicator is used to measure and align the end face and circumference of the coupling. The allowable deviation should meet the requirements of the equipment technical documents.
(1) The installation method of the centrifugal refrigeration unit is basically the same as that of the piston refrigeration unit. The longitudinal and lateral horizontal deviation of the unit installation should not be greater than 1‰, and it should be measured on the base or the parallel processing surface of the base.
(2) When the unit is hoisted, the wire rope should be set on the outside of the evaporator and the condenser, and the wire rope should not be stressed on the instrument panel and pipeline. The contact point between the wire rope
(3) Before the unit is connected to the air intake pipe of the compressor, the blades and the actuator, the blade opening and the indicated position should be observed from the air inlet, adjusted and positioned according to the requirements of the equipment technical documents, and finally connected to the electric actuator.
(4) During installation, the base plate of the equipment should be flat, the base installation should be equipped with vibration isolators, and the compression of the vibration isolators should be consistent.
(1) Before installation, the protective gas pressure charged by the equipment should conform to the factory pressure specified in the equipment technical documents.
(2) When the unit is arranged in the room, a space for maintenance work should be reserved around the unit. When multiple units are arranged, the distance between the two units should be kept at 1.5-2m.
(3) After the refrigeration unit is in place, the initial leveling and fine leveling methods are basically the same as those of the piston refrigeration unit.
(4) The longitudinal and lateral horizontal deviations of the unit installation should not be greater than 1‰, and should be measured according to the reference plane specified in the equipment technical documents. The measurement of horizontal deviation can use the U-tube method or other methods. The installation of fuel or gas direct-fired lithium bromide refrigeration units and auxiliary equipment shall also comply with the relevant requirements of "Code for Fire Protection Design of High-rise Civil Buildings" (GB 50045-1995).
(1) The levelness and overall dimensions of the basic plane of the equipment should meet the requirements of the equipment installation technical documents. When the equipment is installed, a rubber shock absorber block is placed on the foundation, and the equipment is leveled so that the vertical and horizontal level deviation of the modular chiller does not exceed 1‰.
(2) When multiple modular chillers are combined in parallel, a steel base should be added to the foundation, and the unit should be firmly fixed on the base. After connection, the shell of the module unit should be kept intact, the surface should be flat, and connected into a unified whole.
(3) The connection position of the inlet and outlet pipes of the modular chiller should be correct and tight.
(4) A certain ventilation space should be reserved around the air-cooled modular chiller according to the requirements of the equipment technical documents.
8. Large and medium heat pump units
(1) A certain ventilation space should be reserved around the air source heat pump unit according to different equipment.
(2) The unit should be equipped with vibration isolators and have positioning measures to prevent displacement of equipment during operation and damage to equipment interfaces and connected pipes.
(3) There should be a maintenance distance of 1-1.5m on the supply and return pipes of the unit.
9. Auxiliary equipment
(1) Before the auxiliary equipment of the refrigeration system, such as condenser, liquid receiver, oil separator, intercooler, oil collector, air separator, evaporator and refrigerant pump, etc., are in place, the direction of the nozzle and the The position, anchor bolt hole and the position of the foundation shall meet the design requirements.
(2) The installation of auxiliary equipment should meet the following requirements in addition to the design and equipment technical documents.
①The installation of auxiliary equipment should be carried out air tightness test and monomer purging; the air tightness test pressure should meet the requirements of design and equipment technical documents.
②The installation level deviation of horizontal equipment and the vertical deviation of vertical equipment should not be greater than 1‰.
③ When installing equipment with oil collector, one end of the oil collector should be slightly lower.
④The elevation of the liquid inlet of the washing oil separator should be lower than the elevation of the liquid outlet of the condenser.
⑤ When installing low-temperature equipment, dunnage shall be added at the support of the equipment and at the contact with other equipment. The dunnage shall be pre-treated with anti-corrosion treatment, and the thickness of the dunnage shall not be less than that of the thermal insulation layer.
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