CN203146430U - High-temperature self-cooling hot water circulation pump - Google Patents

Abstract

The utility model relates to a high-temperature self-cooling hot water circulation pump, which guides the conveyed high-temperature medium to a cooling structure composed of a heat-insulating air duct, a labyrinth cooling channel, a cooling fin and a cooling fan, and performs high-efficiency cooling on the high-temperature medium through the above-mentioned cooling structure. Cooling, the high temperature medium is cooled to the normal temperature liquid medium, and the normal temperature liquid medium is used to cool the mechanical seal of the pump, and the normal temperature liquid medium and the air duct are used to insulate the bearing, so as to achieve the purpose of self-cooling. Adopting the technical solution of the utility model to cool the pump mechanical seal and the bearing does not require external cooling water, and there is no case of sudden water failure and burning of the pump, which is convenient for users, saves energy, and has a simple structure.

Description

A high-temperature self-cooling hot water circulating pump

technical field

The utility model relates to the technical field of pumps, in particular to a hot water circulating pump, in particular to a high-temperature self-cooling hot water circulating pump.

Background technique

In industries such as metallurgy, electric power, textile, petroleum, chemical industry, chemical fertilizer, pharmaceutical, papermaking, environmental protection, rubber, heating, waste heat utilization, etc., hot water circulating pumps for transporting heat medium will be used. Since the hot water circulating pump transports high-temperature medium, the temperature of the medium is generally higher than 220°C, and the high-temperature medium will transfer heat to the pump, causing the overall temperature of the pump to rise above 220°C, which also affects the components of the pump. The working environment has a certain impact on the safe operation of the pump.

It especially has a great influence on the reliable operation of the shaft seal and bearings of the pump. The shaft seal of the pump adopts a mechanical seal. The working temperature of conventional mechanical seals is generally required to be less than 110°C. The bearing of the pump adopts metal roller bearings. The working environment temperature of conventional metal roller bearings cannot be higher than 75°C. Therefore, for hot water circulating pumps that transport high-temperature media, in order to ensure reliable operation of the pumps, cooling measures must be taken for the mechanical seals and bearings used in the pumps.

Cooling measures usually adopt forced cooling, which means to use external cooling water to flush and insulate the mechanical seal of the pump to ensure the working temperature of the mechanical seal. The cooling water is taken away to ensure the working environment of the bearing. However, the forced cooling method requires a large amount of cooling water. The cooling water generally uses tap water, and the cooling water cannot be stopped at all times. Once it stops, the mechanical seal and bearing will be burned, which brings great harm to the user. A great inconvenience, and not energy-saving, a waste of energy. Therefore, the forced cooling method of the hot water circulation pump needs to be further perfected and improved.

Contents of the invention

In order to overcome the deficiencies of the hot water circulation pump using the external cooling water forced cooling method, which cannot stop water and waste energy, etc., the utility model proposes a high-temperature self-cooling hot water circulation pump, and its purpose is to improve the existing hot water circulation pump. The forced cooling method of the circulating pump is a self-cooling method, which is to use the conveyed medium to lubricate and cool the pump shaft seal, and to insulate and cool the pump bearings, so as to achieve the purpose of non-stop water supply and energy saving.

The technical principle of the utility model is to lead the conveyed high-temperature medium to a special cooling structure for cooling. Open, the labyrinth cooling channel, heat sink and cooling fan cool the high-temperature medium, through this cooling method, the high-temperature medium is cooled to normal temperature, and then the mechanical seal and bearing of the pump are cooled, so as to achieve the purpose of self-cooling.

The specific technical solution is a high-temperature self-cooling hot water circulating pump, wherein the bearing is arranged in the bearing seat, the main shaft is passed through the bearing, the bearing gland is fixed in the bearing seat, and the mechanical seal is installed in the main shaft and the bearing seat. , the guide bearing seat is fixed on the bearing seat, the guide bearing is installed on the main shaft and inside the guide bearing seat, the pump cover and the guide bearing seat are fixed, the impeller is sleeved on the main shaft through the impeller key, and the impeller is axially fixed. The impeller nut is screwed on the main shaft, the anti-reverse sleeve and the impeller are pressed tightly, and the impeller is axially fixed. The impeller is installed in the pump body. The impeller is installed with the pump body sealing ring and the pump cover sealing ring. The pump body and the pump cover are fixed. , the bracket is installed on the guide bearing housing.

Its self-cooling system includes fans, bearing air ducts, labyrinth channels and cooling fins. The fan is set on the end side of the main shaft away from the impeller, the cooling water outlet on the outlet flange is connected to the high temperature water pipe, the high temperature water pipe is connected to the entrance of the labyrinth channel on the bearing seat, and the outlet of the labyrinth channel is connected to the mechanical seal through the normal temperature water pipe Indoors, the mechanical seal chamber communicates with the gap between the main shaft and the guide bearing seat, and the gap between the main shaft and the guide bearing seat communicates with the balance hole on the impeller. A labyrinth seal is provided in the gap between the main shaft and the guide bearing housing.

The fan is sleeved on the main shaft through the fan key, the lock nut locks the fan on the main shaft, and the fan is provided with a windshield.

A bearing air duct is arranged on the outer ring of the bearing seat, and a plurality of bearing cooling fins are arranged on the bearing air duct.

The labyrinth channel is arranged outside the bearing air channel, and the labyrinth channel A partition plate and the labyrinth channel B partition plate are arranged in the labyrinth channel. The partitions of the labyrinth channel A and the partitions of the labyrinth channel B are arranged alternately.

Cooling water cooling fins are arranged on the outside of the labyrinth channel.

Adopting the technical scheme of the utility model, the pump mechanical seal and bearing are cooled by the medium conveyed by itself, no external cooling water is needed, and there is no case of sudden water failure and burning of the pump, which is convenient for users, saves energy, and has a simple structure.

Description of drawings

Fig. 1 shows a longitudinal section structure diagram of a high-temperature self-cooling hot water circulation pump of the present invention.

Figure 2 shows the M-M sectional view of Figure 1.

Fig. 3 shows an expanded view along the centerline NN of Fig. 1 .

In Figure 1, 1 is the impeller nut, 2 is the impeller key, 3 is the anti-reverse sleeve, 4 is the balance hole, 5 is the sealing ring of the pump body, 6 is the impeller, 7 is the pump body, 8 is the outlet flange, and 9 is the cooling Water outlet, 10 is the pump cover, 11 is the sealing ring of the pump cover, 12 is the guide bearing, 13 is the guide bearing seat, 14 is the labyrinth seal, 15 is the high temperature water pipe, 16 is the bearing seat, 17 is the baffle plate, 18 is the bearing wind 19 is the labyrinth channel, 20 is the cooling water air channel, 21 is the normal temperature water pipe, 22 is the outlet of the labyrinth channel, 23 is the bearing, 24 is the fan, 25 is the wind cover, 26 is the main shaft, 27 is the fan key, 28 is the lock Tight nut, 29, bearing gland, 30, mechanical seal, 31, mechanical seal chamber, 32, labyrinth passage entrance, 33, support.

In Fig. 2, 34 is a bearing cooling fin, 35 is a dividing plate of the labyrinth channel A, 36 is a dividing plate of the labyrinth channel B, and 37 is a cooling water cooling fin.

Detailed ways

Below in conjunction with Fig. 1, Fig. 2, Fig. 3, the specific embodiment of the utility model is further described.

As shown in Figure 1, the bearing 23 is set in the bearing seat 16, the main shaft 25 is penetrated in the bearing 23, the bearing gland 29 is fixed in the bearing seat 16, the mechanical seal 30 is installed in the main shaft 26 and the bearing seat 16, and the guide The bearing seat 13 is fixed on the bearing seat 16, the guide bearing 12 is installed on the main shaft 26 and installed in the guide bearing seat 13, the pump cover 10 and the guide bearing seat 13 are fixed, the impeller 6 is set on the main shaft 26 through the impeller key 2, and the circumference The impeller nut 1 is screwed on the main shaft 26, the anti-reverse sleeve 3 and the impeller 6 are pressed tightly, and the impeller 6 is axially fixed. The impeller 6 is installed in the pump body 7, and the impeller 6 and the pump body sealing ring 5, The pump cover seal ring 11 is installed in cooperation. The pump body seal ring 5 and the pump cover seal ring 11 play a sealing effect, the pump cover 10 and the pump body 7 are fixed, and the bracket 33 is installed on the guide bearing seat 13 .

The fan 24 is set on the main shaft 26 through the fan key 27, and is fixed in the circumferential direction. The lock nut 28 is pushed on the bearing 23 by the fan 24, and the fan 24 is locked on the main shaft 26, and the fan 24 is axially fixed, and the windshield is covered. Cover 25. Connect the high-temperature water pipe 15 from the cooling water outlet 9 on the outlet flange 8, and then connect the high-temperature water pipe 15 to the labyrinth channel inlet 31 on the bearing seat 16, and the labyrinth channel A partition plate 35 and the labyrinth channel B partition plate 36 are arranged alternately , forming a labyrinth channel 19, one end of the normal temperature water pipe 21 is installed in the labyrinth channel outlet 22 on the bearing block 16, and the other end is connected to the mechanical seal chamber 31, forming a complete high-temperature self-cooling hot water circulation pump.

When working, the prime mover drives the main shaft 26 to rotate, and the main shaft 26 drives the impeller 6 to rotate synchronously. The rotating impeller 6 pumps the high-temperature liquid medium, and the impeller 6 performs work on the transported high-temperature liquid medium, and the high-temperature liquid medium obtains energy from the impeller 6. In this way, the high-temperature liquid medium flowing out from the outlet of the impeller 6 has relatively high kinetic energy and pressure energy, and the high-temperature liquid medium with relatively high pressure flows out from the cooling water outlet 9 on the outlet flange 8 and flows into the bearing seat 16 through the high-temperature water pipe 15 In the upper labyrinth channel inlet 32, enter the labyrinth channel 19, the flow channel is tortuous, the flow route of the high-temperature liquid medium in the labyrinth channel 19 is longer, the flow is slower, and the longer flow route and slower flow are conducive to outward Transfer heat, so that the labyrinth channel 19 quickly and efficiently transfers heat to the bearing cooling fins 34 and cooling water cooling fins 37 arranged on the labyrinth channel 19 , thereby reducing the temperature of the high-temperature liquid medium flowing in the labyrinth channel 19 .

Since the high-temperature liquid medium flows in the labyrinth channel 19 and dissipates heat, the temperature of the bearing cooling fins 34 and the cooling water cooling fins 37 increases. In order to improve the heat transfer efficiency of the high-temperature liquid medium in the labyrinth channel 19, it is necessary to quickly reduce the bearing cooling fins 34. And the temperature on the cooling water fin 37.

The fan 24 set on the main shaft 26 rotates synchronously with the main shaft 26 under the drive of the rotating main shaft 26. The fan 24 generates a large air volume, which is forced to pass through the air duct equipped with multiple bearing fins 34 and multiple cooling water fins 37. , the heat on the multiple bearing fins 34 and the multiple cooling water fins 37 is taken away, the temperature on the multiple bearing fins 34 and the multiple cooling water fins 37 is reduced, and the forced air cooling effect of the fan 24 Next, the heat of the high-temperature liquid medium in the labyrinth channel 19 is continuously taken away through multiple bearing fins 34 and multiple cooling water fins 37, greatly reducing the temperature of the high-temperature liquid medium in the labyrinth channel 19 until it reaches the labyrinth channel outlet 22 At this time, the temperature of the high-temperature liquid medium has been cooled to close to normal temperature, which can fully meet the cooling requirements of the mechanical seal. In this way, the liquid medium flowing out of the outlet 22 of the labyrinth channel is introduced into the mechanical seal chamber 31 through the mechanical seal cooling water pipe 21, and the mechanical seal chamber 31 The liquid medium inside is the normal temperature medium, and the normal temperature medium is used to cool and lubricate the mechanical seal 30, thereby ensuring the working environment of the mechanical seal 30 and making the mechanical seal 30 work safely and reliably with a long life. The mechanical seal chamber 31 and the main shaft 26 It communicates with the gap between the guide bearing seat 13, and the liquid medium after cooling and lubricating the mechanical seal 30 flows into the gap between the main shaft 26 and the guide bearing seat 13. In the gap between the main shaft 26 and the guide bearing seat 13, a The labyrinth seal 14 acts as a throttling for the liquid medium flowing into the gap between the main shaft 26 and the guide bearing housing 13, ensuring the pressure required for the cooling and lubrication of the mechanical seal 30, and the liquid medium flowing through the gap between the main shaft 26 and the guide bearing housing 13 flows into the The guide bearing 12, after passing through the guide bearing 12, flows through the balance hole 4, returns to the inlet of the impeller 6, and is pumped by the impeller 6 again. At this point, the high-temperature liquid medium is drawn out from the pump outlet flange 8, and then the high-temperature liquid medium is cooled down. The mechanical seal 30 is cooled and lubricated, and finally returns to the self-cooling cycle at the inlet of the impeller 6 .

The cooling method of the bearing 23 is that the mechanical seal chamber 31 is located between the high-temperature medium conveyed by the pump and the bearing 23, and the normal-temperature medium in the mechanical seal chamber 31 separates the conveyed high-temperature medium. At the same time, the bearing 23 is installed in the bearing seat 16, The outer ring of bearing housing 16 is provided with bearing air duct 18, and bearing air duct 18 is equipped with multiple bearing cooling fins 34. Bearing air duct 18 isolates the high-temperature liquid medium flowing in labyrinth channel 19. 34 Under the effect of forced air cooling by the fan 24, the heat generated by the work of the bearing 23 is taken away, thereby ensuring the working environment of the bearing 23 and making the bearing 23 work safely and reliably for a long time.

Claims (7)

1. A high-temperature self-cooling hot water circulating pump, wherein the bearing (23) is set in the bearing seat (16), the main shaft (25) is installed in the bearing (23), and the bearing gland (29) is fixed on the bearing seat ( 16), the mechanical seal (30) is installed in the main shaft (26) and the bearing seat (16), the guide bearing seat (13) is fixed on the bearing seat (16), and the guide bearing (12) is installed on the main shaft (26) ), set in the guide bearing seat (13), the pump cover (10) is fixed with the guide bearing seat (13), the impeller (6) is sleeved on the main shaft (26) through the impeller key (2), and the impeller nut (1 ) on the main shaft (26), press the anti-reverse sleeve (3) and the impeller (6), the impeller (6) is installed in the pump body (7), the impeller (6) and the pump body sealing ring (5) , The pump cover sealing ring (11) is installed in cooperation, the pump body (7) is fixed with the pump cover (10), the bracket (33) is installed on the guide bearing seat (13), and the feature is that the fan (24) is sleeved on the main shaft (26), the cooling water outlet (9) on the outlet flange (8) is connected to the high-temperature water pipe (15), and the high-temperature water pipe (15) is connected to the inlet of the labyrinth channel (19) on the bearing seat (16) (31), the outlet (22) of the labyrinth channel (19) passes through the normal temperature water pipe (21) into the mechanical seal chamber (31), the mechanical seal chamber (31) and the main shaft (26) and the guide bearing housing (13) The gap between them is connected, and the gap between the main shaft (26) and the guide bearing seat (13) is connected with the balance hole (4) on the impeller (6). 2. A high-temperature self-cooling hot water circulation pump according to claim 1, characterized in that the fan (24) is set on the main shaft (26) through the fan key (27), and the lock nut (28) locks the fan ( 24) Locked on the main shaft (26), the fan (24) is provided with a windshield (25). 3. The high-temperature self-cooling hot water circulating pump according to claim 1, characterized in that: a bearing air duct (18) is provided on the outer ring of the bearing seat (16), and a plurality of bearings are installed on the bearing air duct (18) heat sink (34). 4. A high-temperature self-cooling hot water circulating pump according to claim 3, characterized in that: the labyrinth channel (19) is arranged outside the bearing air channel (18), and the labyrinth channel (19) is provided with Labyrinth passage A dividing plate (35) and labyrinth passage B dividing plate (36). 5. A high-temperature self-cooling hot water circulating pump according to claim 4, characterized in that: the labyrinth channel A partition (35) and the labyrinth channel B partition (36) are arranged alternately. 6. The high-temperature self-cooling hot water circulation pump according to claim 1, characterized in that cooling water cooling fins (37) are provided outside the labyrinth channel (19). 7. The high-temperature self-cooling hot water circulating pump according to claim 1, characterized in that a labyrinth seal (14) is provided in the gap between the main shaft (26) and the guide bearing seat (13).

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