The advantages and disadvantages of heat pump and how to choice? _

by:J&T     2020-05-14

heat pump can be without contact through the magnetic conductor ( Isolation set) For power transmission, the transmission device is called a magnetic coupling. Through the coupling of the motor and outer magnetic steel together, within the impeller and magnet steel together. Within the outer magnetic steel and is equipped with fully sealed spacer between magnetic steel, separated from the inner and outer magnetic steel completely, make the magnetic steel in medium, the rotating shaft of the motor driven directly by between magnetic poles of the suction impeller synchronous rotation, so the heat pump will have its advantages and disadvantages,

1. Heat pump, its main advantages:

due to the shaft does not need to wear into the heat pump pump pump shell, but through the air gap of the magnetic fields and thin wall of sleeve transmission torque, driving inside the rotor, thus fundamentally eliminating the shaft seal leakage passage, and implements the completely sealed; Transmission power has overload protection; In addition to magnetic materials and magnetic circuit design have higher requirements, the rest of the technical requirements is not high; Heat pump maintenance and small maintenance workload.

2。 Heat pump the main shortcomings:

the efficiency of magnetic drive pump is lower than ordinary centrifugal pump; Isolation of single side leakage set of materials and manufacture the demand is higher; Magnetic drive pump due to the limitation of material and the magnetic transmission, therefore the domestic only commonly used for conveying under 100 ℃, 1. Medium under 6 mpa; Due to the wear resistance of sleeve materials generally poor, so the magnetic drive pumps are commonly used to transport medium not containing solid particles; In the coupling of the demand is high, to not at that time, can cause the damage of the inlet bearing and single side leakage isolation of wear.

  3. Heat pump temperature abroad:

general abroad, like SPECK brand the highest temperature of 350 degrees, die temperature machine commonly used high temperature of 220 degrees - magnetic pump 350 degrees.

heat pump as a kind of high quality hot oil circulation pump and heating medium pump, is the ideal auxiliary pump in heat exchange equipment, can handle liquid not containing solid particles and high temperature. Heat pump can run from piping arrangement and operating conditions, fluid properties, fluid throughput, device lift this a few parameters selection,

1. Heat pump liquid

device system piping layout condition refers to send liquid height conveying liquid from liquid to, such as absorption side the lowest level, such as the highest level of discharge side length, some data and piping specifications and materials, pipe specification, quantity, etc. , comb for department head and NPSH checking calculation.

2。 Heat pump operating conditions

the content of the operating conditions, such as the operation of the liquid saturated steam force T p, suction side pressure PS ( Absolute) , discharge side pressure container PZ, altitude, the environment temperature is clearance or continuous operation, the position of the high temperature heat conduction oil pump is fixed or movable.

3。 Heat pump fluid properties

includes the name of the liquid medium, physical properties, chemical properties and other properties, physical properties with temperature density d, c u viscosity, solid particle diameter and gas content in the medium, etc. , this is related to the system of the head, effective computing cavitation allowance and appropriate pump type: chemical properties, mainly refers to the chemical corrosion resistance and toxicity of liquid medium, is to choose what kind of shaft seal material selection and heat conduction oil water pump type of important basis.

4。 Heat pump

required lift device system is another important performance data of pump, general use 5% Head to selection after 10% allowance.


heat pump flow is one of the important performance data of hot oil pump, it is directly related to the entire plant production capacity and transmission capacity. Such as design process design can calculate a normal, minimum, maximum three flow pump. Choosing pump, based on maximum flow, normal flow, give attention to two or morethings when there is no maximum flow, usually desirable to normal flow rate of 1. 1 times as the maximum flow.

Wow, this sounds like a bit of a cruel question, but it is a vitally important question to ask yourself if you are struggling with your winter cover pump and you would like to stop the water pump problem.
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The pool cover drain pump-type water pump is poised to lead the winter cover pump market.
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