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KQWR-G High-Temperature Hot Water Pump Manufacturer in China

KQWR-G High-Temperature Hot Water Pump

The KQWR-G hot water circulation pump is a new generation of energy-saving hot water circulation pump successfully developed by our company on the basis of absorbing the advanced technology of similar products at home and abroad and extensive consultation with domestic engineering design experts. High cavitation performance and good product performance have reached the leading level of similar products at home and abroad. The main features of this series of products: advanced models and high efficiency, simple structure and easy maintenance, safety, reliability and long life, saving energy and benefiting the environment.

The performance parameters, installation dimensions, quality control, main parts materials and technical requirements of the KQWR-G hot water circulation pump, the pump cooling method, the mechanical seal structure, etc. all comply with the standards of the American Petroleum Institute (API610 centrifugal pumps for petroleum, heavy chemicals and natural gas industries). pump standards) and meet the relevant standard requirements of ISO and GB. The pump adopts CAD modular structure design. The entire series has 25 models, more than 100 specifications and varieties, and only 5 types of brackets. The parts are highly versatile.

Our company has obtained ISO9001:2000 quality system certification. The product manufacturing process has a strict quality control system, and product quality is fully guaranteed.

KQWR-G Series Hot Water Circulation Pump

Low NPSH design, reliable operation

The advanced hydraulic model and back blade design ensure that the pump has good cavitation resistance, ensuring that the pump will not cause cavitation in all working conditions and operate reliably.

Closed impeller design, efficient and reliable

The closed impeller has strong adaptability to working conditions, high efficiency and low cavitation value, ensuring high pump operating efficiency and high operating reliability.

Unique sealing design, longer life

The unique seal cavity structural design provides sufficient external environment for the seal. At the same time, the special seal design is adopted to ensure the long service life of the seal.

Simple and reasonable structure, easy to maintain

It adopts component design and assembly to implement the structure and standards of industrial processes, making it easy to disassemble and assemble for easy maintenance.

• Model description
• Purpose and conditions of use
• Pump structure diagram
• Main parts material list

When the temperature of the transmission medium is between 130℃~230℃, a mechanical seal with a threaded pump and an external heat exchanger are optional; when the temperature of the transmission medium exceeds 230℃, a metal bellows mechanical seal is optional.

The pump shaft material is 45/42CrMo/3Cr13, of which 3Cr13 is used when T≥175℃, which is a high-end configuration; when the medium temperature is below 130℃, the pump shaft material is 45 steel, which is a general configuration.

KQWR-G hot water circulation pump is widely used in central heating of iron and steel metallurgy, power stations, rubber tires, chemicals, textiles, large building facilities and residential areas, waste heat utilization in factories, and hot water transportation and industrial process systems. cycle.

Conditions of use: The operating pressure of the system is less than 4.0MPa; the conveying medium is hot water, and the medium temperature is not higher than 230°C; main performance parameters: flow rate 5 to 800 (m3/h), lift 6.8 to 240 (m), and rotation speed of 1450r/ min and 2900r/min, power 0.25～500 (KW).

Structural characteristics

The KQWR-G hot water circulation pump is a horizontal radially split, rear-opening, single-stage single-suction volute centrifugal pump. The impeller is a closed structure and uses back blades to balance the axial force. The volute of the pump has an end-suction, ejection, and central support structure. The bearings are lubricated by thin oil. The shaft seal adopts a standard mechanical seal or a metal bellows mechanical seal. The seal cavity, bearing bracket, and pump feet can all be cooled by cooling water. , to ensure the service life of mechanical seals and bearings. The structural design of this series of pumps also meets the requirements of process pumps. When using an extended coupling, the rotor components can be disassembled without moving the pump body, the inlet and outlet connecting pipelines and the motor, so that the pump can be reassembled during reassembly. Calibration is relatively simple, which brings great convenience to pump maintenance. If restricted by installation conditions, the intermediate coupling may not be added according to user requirements.

The KQWR-G hot water pump can be equipped with Y2 or YB series motors (380V, 50Hz), or with high-voltage motors (6000V, 10000V, 50Hz). Pumps of the same model can be equipped with motors of different powers under different operating conditions (different shaft powers).

Compared with similar products at home and abroad, this type of hot water pump has the following improvements in structural design:

1. The KQWR-G hot water pump increases the effective volume of the mechanical seal cooling chamber, improves the cooling effect of the mechanical seal, and extends the service life of the mechanical seal;
2. A throttling bypass pipe can be added between the sealing chamber and the pump inlet, so that the high-pressure medium in the sealing chamber flows to the pump inlet. The medium in the sealing chamber is constantly flowing and circulating, which can reduce the temperature and pressure of the sealing chamber, which is beneficial to Mechanical seal service life;
3. The mechanical seal chamber of KQWR-G hot water pump is designed as a standard seal chamber, which can be installed with ordinary single-end mechanical seal, double-end mechanical seal or metal bellows mechanical seal to adapt to different usage conditions. Require;
4. Add a cooling water chamber to the mechanical seal gland, and the cooling water can be used to quench the static ring of the mechanical seal. When the temperature of the pump medium exceeds 130°C, a mechanical seal with a threaded pump and an external heat exchanger should be used. The cooled pump delivers high-pressure medium and flushes the end face of the mechanical seal, greatly extending the service life of the mechanical seal. The normal service life of the mechanical seal is more than one year;
5. Choose reinforced bearings and appropriately increase the volume of the lubricating oil tank and lubricating oil cooling cavity of the bracket bearing. Under normal use, the service life of the bearings will be more than three years;
6. Adopt structural optimization design for the pump shaft to improve the overall stiffness of the pump shaft, reduce the dynamic deflection of the pump operation, and reduce the vibration and noise of the pump operation;
7. The KQWR-G hot water pump uses a metal laminated flexible coupling, which is light in weight, has good dynamic balance performance, can automatically compensate for the displacement of the unit shaft, runs smoothly, has low noise and is energy-saving;
8. The KQWR-G hot water pump adopts an advanced hydraulic model. The pump has good cavitation resistance and can be used as a condensate pump;
9. The back blade is used to balance the axial force, and the residual axial force is borne by a pair of double angular contact ball bearings installed back to back. The structure is simpler than the balance hole, which improves the hydraulic efficiency of the pump and improves the cavitation performance of the pump inlet.

Maximum working pressure allowed by the pump

Corresponding to different medium temperatures, the maximum allowable pressure of the pump is different. When the KQWR-G hot water circulation pump works at different hot water temperatures, the maximum allowable working pressure is shown in the table below.

Maximum allowable working pressure (MPa) of KQWR-G hot water circulation pump under different medium temperatures

temperature model 20℃200℃220℃230℃

KQWR-G25/160 3.3 3.3 3.2 3.1

KQWR-G25/200 2.5 2.5 2.4 2.3

KQWR-G40/160 3.4 3.4 3.2 3.1

KQWR-G40/200 2.5 2.5 2.4 2.3

KQWR-G40/250 3.3 3.3 3.2 3.1

KQWR-G40/315 3.2 3.2 3.1 3.0

KQWR-G50/160 3.2 3.2 3.1 3.0

KQWR-G50/200 2.5 2.5 2.4 2.3

KQWR-G50/250 3.4 3.4 3.2 3.1

KQWR-G50/315 3.3 3.3 3.2 3.1

KQWR-G80/160 3.3 3.3 3.1 3.0

KQWR-G80/200 3.8 3.4 3.4 3.4

KQWR-G80/250 3.7 3.6 3.5 3.3

KQWR-G80/315 3.2 3.2 3.1 3.0

KQWR-G80/400 3.2 3.0 2.9 2.8

KQWR-G100/200 3.8 3.4 3.4 3.4

KQWR-G100/250 4.0 3.6 3.5 3.4

KQWR-G100/315 3.2 3.2 3.1 3.0

KQWR-G100/400 3.3 3.3 3.2 3.1

KQWR-G150/250 4.0 4.0 3.8 3.7

KQWR-G150/315 3.9 3.7 3.6 3.6

KQWR-G150/400 3.4 3.3 3.2 3.1

KQWR-G200/250 3.5 3.0 2.9 2.9

KQWR-G200/315 4.0 3.7 3.6 3.6

KQWR-G200/400 2.9 2.9 2.8 2.7

Pump mechanical seal and bearing model

Pump model Mechanical seal (Borgmann)Bearing

Medium temperature is less than 130℃Medium temperature is greater than 130℃Cylindrical Roller Bearings

GB/T 283-94 Pairs of double angular contact ball bearings

GB/T 292-94 The amount of fuel(L)

KOWR-G25/160

KQWR-G25/200

KQWR-G40/160

KQWR-G40/200

KQWR-G50/160

KQWR-G50/200 H75/28-G115 H75F/28-G9 NU307E 7307B/DB 0.2

one set one set one set one pair

KOWR-G40/250

KQWR-G40/315

KQWR-G50/250

KQWR-G50/315

KQWR-G80/160

KQWR-G80/200

KQWR-G80/250

KQWR-G100/200 H75/40-G115 H75F/40-G9 NU307E 7307B/DB 0.5

one set one set one set one pair

KOWR-G80/315

KQWR-G100/250

KQWR-G100/315

KQWR-G150/250 H75/50-G115 H75F/50-G9 NU311E 7311B/DB 0.8

one set one set one set one pair

KOWR-G80/400

KQWR-G100/400

KQWR-G150/315

KQWR-G150/400

KQWR-G200/250 H75/60-G115 H75F/60-G9 NU313E 7313B/DB 1.5

one set one set one set one pair

KQWR-G200/315

KQWR-G200/400 H75/70-G115 H75F/70-G9 NU413E 7315B/DB 1.8

one set one set one set one pair

Pump appearance and installation dimensions table

illustrate

1. Pump inlet and outlet flange implementation standard: GB/T9113.1-2000 4.0MPa;
2. Cooling water inlet flange: GB/T9119-2000 DN25-PN10 RF,Cooling water outlet flange: GB/T9119-2000 DN25-PN10 RF.illustrate
3. Pump inlet and outlet flange implementation standard: GB/T9113.1-2000 4.0MPa;
4. Cooling water inlet flange: GB/T9119-2000 DN25-PN10 RF,

Cooling water outlet flange: GB/T9119-2000 DN25-PN10 RF.

KQWR-G hot water circulation pump, according to the different temperatures of the transport medium, there are two ways of mechanical seal and pump cooling pipeline.

Mechanical seal: When the temperature of the transmission medium is between 130℃~230℃, the H75F type mechanical seal with its own thread pump and an external heat exchanger are optional; when the temperature of the transmission medium is between 80℃~130℃, the H75/ -G115 type mechanical seal.

Cooling pipeline: The inlet and outlet main pipe of the cooling water pipeline is flanged, and the flange is GB/T9119-2000 DN25-PN10 RF. The cooling water supply pressure is 0.3 MPa – 0.6 MPa, and the cooling water temperature is normal temperature water (it is recommended to use softened water to prevent clogging of the cooling water pipeline). When the medium temperature is above 130℃, the cooling water volume required by each pump is approximately 3m3/h. When the medium temperature is below 130℃, the cooling water volume required by each pump is approximately 2m3/h.

Scope of supply

(1) Water pump, motor, base, coupling, coupling cover, cooling water pipeline (optional), anchor bolts, etc.;

(2) Product samples, installation instructions;

(3) Random spare parts (proposed by the user and supplied according to the contract), packing list.

Ordering Instructions

(1) Provide the selected pump model and the flow and head parameters of the operating point required by the user;

(2) It is necessary to clarify the inlet pressure of the pump and the maximum pressure of the system;

(3) It is necessary to clarify the operating temperature of the hot water pump. If it is used to transport other media, the name of the medium, operating temperature, viscosity, density, corrosiveness and other parameters must be indicated;

(4) The scope of supply, mechanical seal and motor models, cooling methods, etc. must be indicated in the contract, or there may be other special configuration requirements;

(5) If you have other special requirements for the hot water pump or the operating conditions required by the user exceed the range listed in the manual, please contact the relevant department and we will definitely give you a satisfactory answer.