CN212429196U

CN212429196U - Two-stage double-suction horizontal condensate pump

Info

Publication number: CN212429196U
Application number: CN202021009712.7U
Authority: CN
Inventors: 刘伟; 高瑞; 赵斌
Original assignee: Hunan Xemc Changsha Pump Works Co ltd
Current assignee: Changsha Pump Works Co ltd
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2021-01-29
Anticipated expiration: 2030-06-03

Abstract

The utility model discloses a two-stage double-suction horizontal condensate pump, which comprises a pump body and two groups of impellers coaxially assembled in the pump body; the two groups of impellers are fixedly assembled on a pump shaft which is transversely arranged, two ends of the pump shaft are supported by bearing seats which are fixed relative to a pump body, two groups of volute chambers which correspond to the two groups of impellers are arranged in the pump body, two suction chambers are arranged at two axial ends of the impellers in the two groups of volute chambers, a pressing-out chamber is arranged along the circumferential tangential direction of the impellers, the suction chambers of one group of volute chambers are communicated with a pump inlet on the pump body and serve as first-stage suction chambers of the whole water pump, the pressing-out chambers of the other group of volute chambers are communicated with a pump outlet on the pump body and serve as secondary pressing-out chambers of the whole water pump, and the rest pressing-out chambers and the suction chambers of the two. The utility model discloses a two sets of double suction impellers are established ties and are arranged among the horizontal condensate pump of two-stage double suction, high lift, high efficiency, job stabilization.

Description

Two-stage double-suction horizontal condensate pump

Technical Field

The utility model belongs to water pump for thermal generator set, concretely relates to horizontal condensate pump of two-stage double suction.

Background

Various types of water pumps can be used in the whole thermal generator set, such as: the structure of the condensate pump is a large vertical barrel-type multistage centrifugal pump, a small horizontal single-stage or multistage single-suction centrifugal pump, for example, a bearing device for a vertical condensate pump disclosed in Chinese patent document with application number of 200820207351.X, small-sized power plants generally use a large vertical barrel-type condensate pump, and a barrel-type condensate pump disclosed in Chinese patent document with application number of 201620671036.7 has the disadvantages that a pump well needs to be built in a pump room, and the engineering construction amount is large; the water pump is sent from the mill and still needs outer barrel and pump body to assemble to the installation scene, and the installation is inconvenient, and the installation work volume is big, and the structure is complicated, and axial dimension is great, and vertical structure is difficult for overhauing, easily takes place the vibration when the frequency conversion operation.

Disclosure of Invention

The utility model provides a technical problem be: aiming at the problems of the condensate pump in the existing thermal generator set, the two-stage double-suction horizontal condensate pump is provided.

The utility model discloses a following technical scheme realizes:

the two-stage double-suction horizontal condensate pump comprises a pump body shell and two groups of impellers coaxially assembled in the pump body shell;

the two groups of impellers are fixedly assembled on a pump shaft which is transversely arranged, two ends of the pump shaft are supported by bearing seats which are fixed relative to a pump body shell, two groups of volute chambers which correspond to the two groups of impellers are arranged in the pump body shell, two suction chambers are arranged at two axial ends of the impellers in the two groups of volute chambers, extrusion chambers are arranged along the circumferential tangential direction of the impellers, the suction chambers of one group of volute chambers are communicated with a pump inlet on the pump body shell and serve as first-stage suction chambers of the whole water pump, the extrusion chambers of the other group of volute chambers are communicated with a pump outlet on the pump body shell and serve as secondary extrusion chambers of the whole water pump, and the rest extrusion chambers and the suction chambers of the two groups of volute chambers are communicated through interstage transition flow.

In the two-stage double-suction horizontal condensate pump of the technical scheme, the pump body shell comprises the pump body and the front pump cover and the rear pump cover which are respectively assembled at the two ends of the pump shaft, and an inner volute structure for accommodating the impeller is formed among the front pump cover, the pump body and the rear pump cover, so that the volute inside the pump body can be conveniently processed and assembled.

In the two-stage double-suction horizontal condensate pump adopting the technical scheme, the decompression sleeves are assembled between the pump body shell between the two sets of volute chambers and the pump shaft and between the pump body shell where the secondary suction chamber is located and the pump shaft, so that the mechanical seal damage caused by overhigh pressure is prevented.

In the two-stage double-suction horizontal condensate pump adopting the technical scheme, the front pump cover and the rear pump cover are respectively assembled with the pump shaft through the shaft seal cooling gland and the mechanical seal, the shaft seal cooling gland is internally provided with the circulating cooling flow channel connected with the shaft seal cooling cavity on the front pump cover and the rear pump cover, the circulating cooling flow channel is connected with the shaft seal cooling water pipe, and the rotating assembly area between the pump shaft and the pump cover is cooled in the high-speed rotating process of the pump shaft.

In the two-stage double-suction horizontal condensate pump adopting the technical scheme, the mechanical seal is connected with the mechanical seal flushing water pipe to flush the inside of the mechanical seal.

In the two-stage double-suction horizontal condensate pump adopting the technical scheme, the inner side of the shaft seal cooling gland is communicated with the pressure relief recovery water pipe, the pressure relief recovery water pipe is connected to the pump inlet of the pump body shell in a recovery mode, and part of leaked medium is connected to the pump inlet through the pressure relief recovery water pipe, so that medium waste is prevented.

In the two-stage double-suction horizontal condensate pump adopting the technical scheme, the top of the pump body is provided with the exhaust hole cover, so that air in the volute chamber of the pump body can be conveniently discharged.

The utility model discloses an among the two-stage double suction horizontal condensate pump, the pump shaft passes through bearing frame internally mounted's antifriction bearing and rotates the support, the bearing frame is inside to be equipped with lubricated grease chamber at antifriction bearing's a terminal surface, the inside lubricating oil that is equipped with of lubricated grease chamber, the fixed slinger that is equipped with on the corresponding axle section of lubricated grease chamber of pump shaft, the slinger rotates along with the pump shaft and throws away oily lubrication to antifriction bearing.

In the two-stage double-suction horizontal condensate pump adopting the technical scheme, the detachable oil chamber cover is arranged at the bottom of the lubricating oil chamber, and the oil discharge valve is arranged on the oil chamber cover, so that lubricating oil in the lubricating oil chamber can be discharged conveniently.

In the two-stage double-suction horizontal condensate pump of the technical scheme, the oil chamber cover is located at the inner side of the lubricating oil chamber and is fixedly provided with the cooling coil, the cooling coil is communicated with the bearing seat cooling water pipe outside the oil chamber cover, circulating cooling water is introduced into the cooling coil to carry out heat exchange cooling on lubricating oil and the inner cavity of the bearing seat, and therefore the working temperature of the rolling bearing is reduced in the high-speed rotation process of the pump shaft, and the service life of the bearing is prolonged.

The utility model discloses a horizontal condensate pump of two-stage double suction has following beneficial effect: the two groups of double-suction impellers are arranged in series, so that the lift and the efficiency are high, the axial force is balanced to the maximum extent, and the stable operation of the pump is ensured; the bearing seat design of a large-volume structure is adopted, the bearing is lubricated by thin oil, and the lubricating oil and the temperature of the bearing are fully cooled by a cooling coil pipe at high temperature; the integrated mechanical seal assembly can ensure the clean operation of the water pump and avoid the leakage, dripping and leakage; the normal work of the pump shaft rotation assembly area is guaranteed by the multiple groups of cooling structures.

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

Drawings

Fig. 1 is an external perspective view of a two-stage double suction horizontal condensate pump of an embodiment.

Fig. 2 is an internal front sectional view of the two-stage double suction horizontal condensate pump of the embodiment.

FIG. 3 is a schematic view of an internal flow passage of the two-stage double suction horizontal condensate pump according to the embodiment.

Fig. 4 is a schematic view of the internal structure of a rear bearing block in the two-stage double-suction horizontal condensate pump according to the embodiment.

Fig. 5 is a schematic view of the internal structure of a front bearing seat in the two-stage double-suction horizontal condensate pump according to the embodiment.

Reference numbers in the figures: 1-rear bearing seat, 2-rolling bearing, 3-bearing inner side gland, 4-bearing inner side end cap, 5-shaft sleeve nut, 6-shaft sleeve, 7-bearing seat cooling water pipe, 8-bearing seat cooling water pipe, 9-shaft seal cooling water pipe, 10-shaft seal cooling water pipe, 11-exhaust hole cap, 12-decompression sleeve, 13-decompression recovery water pipe, 14-mechanical seal flushing water pipe, 15-pump inlet, 16-pump outlet, 17-shaft sleeve, 18-shaft sleeve nut, 19-bearing inner side end cap, 20-rolling bearing, 21-front bearing seat, 22-bearing outer side end cap, 24-pump shaft, 25-mechanical seal, 26-shaft seal cooling gland, 27-shaft sleeve, 28-front pump cap, 29-baffle sleeve, 30-first impeller, 31-pump body, 32-baffle sleeve, 33-baffle sleeve, 34-second impeller, 35-baffle sleeve, 36-shaft sleeve, 37-rear pump cover, 38-shaft seal cooling gland, 39-mechanical seal, 40-bearing outer end cover, 41-exhaust cap, 42-cooling coil, 43-first stage suction chamber, 44-first stage extrusion chamber, 45-interstage transition flow passage, 46-bearing gasket, 47-oil drain valve, 48-oil chamber cover, 49-oil slinger, 50-bearing baffle sleeve, 51-round nut, 52-bearing gasket, 53-cooling coil, 54-bearing baffle sleeve, 55-bearing lock nut, 56-secondary suction chamber, 57-oil slinger, 58-oil chamber cover, 59-oil drain valve, 60-secondary extrusion chamber.

Detailed Description

Referring to fig. 1 and 2, the two-stage double-suction horizontal water pump shown in the figure is a specific embodiment of the condensate pump of the present invention, and specifically includes a rear bearing seat 1, a front bearing seat 21, a front pump cover 28, a first impeller 30, a pump shaft 24, a pump body 31, a second impeller 34, a rear pump cover 37, and other components, wherein the front pump cover 28, the pump body 31, and the rear pump cover 37 are assembled into a water pump body housing structure, two sets of volute chambers for accommodating the first impeller 30 and the second impeller 34 are formed by internal processing, the whole pump body is of a horizontal structure, the pump shaft 24 transversely penetrates through the front pump cover 28, the pump body 31, and the rear pump cover 37 and is supported and assembled by the front bearing seat 21 and the rear bearing seat 1 fixedly disposed at two ends of the pump body, wherein the front bearing seat 21 and the front pump cover 28 are located at one end of the pump shaft 24 connected to a motor, and is located at a front, is the power input end on the pump shaft. The first impeller 30 and the second impeller 34 are fixedly assembled on the pump shaft 24 on the shaft sections corresponding to the two sets of worm chambers in the pump body.

The impeller in this embodiment is a centrifugal pump impeller, and the specific impeller structure can refer to the existing centrifugal impeller, and a pump inlet 15 and a pump outlet 16 are arranged on the pump body housing structure, specifically as shown in fig. 3, two groups of volute chambers inside the pump body are respectively provided with two suction chambers at two axial ends of the impeller, and extrusion chambers are arranged along the circumferential tangential direction of the impeller, wherein the volute chamber where the first impeller 30 is located is provided with a primary suction chamber 43 and a primary extrusion chamber 44, two groups of primary suction chambers 43 are in tandem communication with the pump inlet 15 on the pump body, the volute chamber where the second impeller 34 is located is provided with a secondary suction chamber 56 and a secondary extrusion chamber 60, the secondary extrusion chamber 60 is in communication with the pump outlet 16 on the pump body, and the primary extrusion chamber 44 and the two groups of secondary suction chambers 56 are in tandem communication through an interstage transition flow passage 45 on the pump body. The pump inlet and the pump outlet on the pump body of the water pump are both in the horizontal direction, the suction chamber adopts the design of a spiral double-suction chamber which is symmetrically arranged, a part of suction flow channels are respectively arranged in the front pump cover 28 and the rear pump cover 37, and the suction flow channels and the pump body 31 form a complete suction chamber together, so that fluid can uniformly enter the impeller without generating vortex, and the pump body 31, the front pump cover 28 and the rear pump cover 37 are sealed by O-shaped rings; the extrusion chambers of the two sets of volute chambers are designed in a double-volute mode, and radial force is balanced; the conveyed medium water enters the primary suction chamber 43 from the pump inlet, is thrown out by the first impeller 30, enters the secondary suction chamber 56 from the primary extrusion chamber 44, is thrown out by the second impeller 34, and then is conveyed from the secondary extrusion chamber 60 to the pump outlet 16, the first impeller 30 and the second impeller 34 are arranged in series between the volute chambers, the pumping flow is improved by using the double suction chambers of the volute chambers, and the pumping lift of the medium water is improved by using the two-stage impellers. The pump body shell of the water pump is supported by the ground feet and the support legs are firm.

The pump body 31 is assembled with a front pump cover 28 and a rear pump cover 37 at two ends along the axial direction of the pump shaft, the front pump cover 28 and the rear pump cover 37 are respectively fixedly connected with the pump body 31 through flange bolts, the inner wall shapes corresponding to the volute chambers are respectively processed on the front pump cover 28, the pump body 31 and the rear pump cover 37 through casting or other machining modes, an internal volute chamber structure for accommodating an impeller is formed inside the whole assembled pump body shell, the front pump cover 28 and the pump shaft 24 are hermetically assembled through a shaft seal cooling gland 26 and a mechanical seal 25, and the rear pump cover 37 and the pump shaft 24 are hermetically assembled through a shaft seal cooling gland 38 and a mechanical seal 39.

Referring to fig. 1 and 2 in detail, the second impeller 34 is fixedly assembled on the pump shaft 24 through a key 9 and a shaft shoulder on the pump shaft 24, retaining

sleeves

33 and 35 for positioning the impeller shaft are further sleeved on the pump shaft sections on two sides of the second impeller 34, the

retaining sleeves

33 and 35 are fixedly assembled on the pump shaft 24 through keys, and similarly, the first impeller 30 and the retaining sleeves 29 and 32 on two sides thereof are fixedly assembled on the pump shaft 24 through keys. In order to accurately position the two groups of impellers in the two groups of volute chambers in the pump body, shaft sleeves 27 and 36 are further sleeved on shaft sections of the pump shaft 24 assembled with the front pump cover 28 and the rear pump cover 37 respectively, the shaft sleeves 27 and 36 are fixedly assembled on the pump shaft 24 through keys, the shaft sleeves 27 and 36 simultaneously play a role of a rotating bearing between a mechanical seal of the front pump cover 28 and the rear pump cover 37 and an end cover,

short shaft sleeves

6 and 17 with a sealing function are arranged on the shaft sections of the pump shaft outside the shaft sleeves 27 and 36 respectively and are locked on the pump shaft 24 through

shaft sleeve nuts

5 and 18 respectively, and the first impeller 30 and the second impeller 34 are axially positioned and assembled in the two groups of volute chambers of the pump body respectively through axial abutting assembly of the shaft sleeves and the retaining sleeves.

Sealing rings are arranged at the inlets of the pump body 31, the front pump cover 28, the rear pump cover 37 and the first impeller 30 and the second impeller 34, and form a micro gap with the first impeller 30 and the second impeller 34, so that the throttling sealing effect is achieved. Meanwhile, a pressure reducing sleeve 12 is assembled between the pump body and the pump shaft between the two sets of volute chambers, the pressure reducing sleeve 12 is assembled between a retaining sleeve on the pump shaft and the pump body, and a pressure relief sealing water tank is arranged on the pressure reducing sleeve, so that the pressure of a secondary suction chamber to a primary extrusion chamber is reduced, and medium backflow, hydraulic loss increase and water pump efficiency reduction caused by overhigh pressure are prevented. The rear pump cover is also provided with a pressure relief sealing water tank, so that the pressure of a medium communicated to the mechanical seal cooling cavity from the secondary suction chamber where the second impeller 34 is located is reduced, and the mechanical seal damage caused by overhigh pressure is prevented. Furthermore, a high-pressure medium pressure relief hole is formed in the inner side of a shaft seal cooling gland 38 on the volute side where the second impeller 34 is located, a pressure relief recovery water pipe 13 is arranged on the shaft seal cooling gland 38 and communicated with the high-pressure medium pressure relief hole, the pressure relief recovery water pipe 13 is connected to the pump inlet of the pump body from the outer side of the pump body in a returning mode, and part of medium water leaked from a pressure relief groove of the rear pump cover is connected to the pump inlet through the pressure relief recovery water pipe 13 to recycle the leaked medium water.

The front pump cover 28 and the rear pump cover 37 are provided with cooling water cavities at the same time, the corresponding shaft seal cooling gland covers 26 and 38 are internally provided with circulating cooling flow channels communicated with the cooling water cavities, the shaft seal cooling gland covers 26 and 38 are respectively provided with interfaces in butt joint with the respective circulating cooling cavities, the shaft seal cooling water pipes 10 and 9 are respectively connected through the interfaces, the shaft seal cooling water pipes 10 and 9 are respectively connected with an external cooling water circulation system, the

mechanical seals

25 and 39 are cooled in an auxiliary cooling mode through cooling water holes in the shaft seal cooling gland covers 26 and 38, and in the high-speed rotation process of the pump shaft, the rotating assembly area between the pump shaft and the pump cover is cooled.

The

mechanical seals

25 and 39 corresponding to the front pump cover 28 and the rear pump cover 37 are provided with flushing holes, the flushing holes on the mechanical seals are respectively connected with a mechanical seal flushing water pipe 14, the mechanical seal flushing water pipe 14 is connected with medium water after the pressure of the pump outlet is reduced, and the

mechanical seals

25 and 39 are respectively flushed after being divided into two parts.

The top of the pump body 31 is provided with an exhaust hole cover 11 for air exhaust, and the exhaust hole cover 11 can be connected with an exhaust valve for air exhaust before the operation of the water supply pump.

The pump shaft 24 in this embodiment adopts a heavy-duty rigid shaft design, and is supported by the front bearing seat 21 fixed at the two ends of the pump body and the

rolling bearings

2 and 20 inside the rear bearing seat 1, so that the bearing span is small, and the shaft deflection at the sealing part can be reduced, wherein the rolling bearing 2 inside the rear bearing seat 1 is a spherical self-aligning roller bearing, and the rolling bearing 20 inside the front bearing seat 21 is a cylindrical roller bearing.

Referring specifically to fig. 4, inside the rear bearing seat 1, the outer ring of the rolling bearing 2 is fixed in the mounting hole inside the rear bearing seat 1 through the bearing lining ring 46 and the bearing seat step, the inner ring is fixed on the pump shaft 24 through the bearing spacer sleeve 50 and the round nut 51, two ends of the rear bearing seat 1 are encapsulated through the bearing inner end cover 4, the bearing inner side gland 3 and the bearing outer end cover 40, and the rolling bearing 2 is axially positioned on the rear bearing seat 1 and the pump shaft 24. The rear bearing seat 1 is internally provided with a lubricating oil chamber on the end face of the outer side of the axial direction of the rolling bearing 2, lubricating oil is filled in the lubricating oil chamber, a slinger 49 is fixedly assembled on a shaft section of the pump shaft 24 corresponding to the lubricating oil chamber in the rear bearing seat 1, the slinger 49 is fixed on a bearing spacer sleeve 50, the slinger 49 rotates along with the pump shaft 24 and the bearing spacer sleeve 50, the lubricating oil surface in the lubricating oil chamber is higher than the lowest rotating position of the slinger 49, the lubricating oil at the bottom of the lubricating oil chamber is thrown onto the rolling bearing 2, the rolling bearing 2 is subjected to oil throwing lubrication, the lower part of the rear bearing seat 1 is provided with an oil return groove, and the. An oil-proof and dust-proof oil seal is assembled on the end cover 4 at the inner side of the bearing, and a water retaining ring with a water retaining effect is arranged in front of the oil seal.

Referring specifically to fig. 5, inside the front bearing seat 21, the outer ring of the rolling bearing 20 is fixed in the mounting hole inside the front bearing seat 21 through the bearing lining ring 52 and the bearing seat step, the inner ring is fixed on the pump shaft 24 through the bearing blocking sleeve 54 and the bearing locking nut 55, both ends of the front bearing seat 21 are encapsulated by the bearing inner side end cap 19 and the bearing outer side end cap 22, and the rolling bearing 20 is axially positioned on the front bearing seat 21 and the pump shaft 24. The front bearing block 21 is internally provided with a lubricating oil chamber on the end face of the outer side in the axial direction of the rolling bearing 20, lubricating oil is filled in the lubricating oil chamber, the pump shaft 24 is fixedly provided with an oil slinger 57 on a shaft section corresponding to the lubricating oil chamber in the front bearing block 21, the oil slinger 57 is fixed on the bearing spacer 54, the oil slinger 57 rotates along with the pump shaft 24 and the bearing spacer 54, the lubricating oil surface in the lubricating oil chamber is higher than the lowest rotating position of the oil slinger 57, the lubricating oil at the bottom of the lubricating oil chamber is thrown onto the rolling bearing 20, the rolling bearing 20 is lubricated by oil slinging, the lower part of the front bearing block 21 is provided with an oil return groove, and the thrown. Oil-proof and dust-proof oil seals are arranged on the bearing inner side end cover 19 and the bearing outer side end cover 22, and a water retaining ring with a water retaining function is arranged in front of the oil seals.

The bottom of the lubricating oil chamber of the rear bearing seat 1 and the front bearing seat 21 is respectively provided with a detachable oil chamber cover 48 and a detachable oil chamber 58, the oil chamber cover 48 and the oil chamber 58 are respectively provided with an oil drain valve 47 and an oil drain valve 59, and the lubricating oil in the lubricating oil chambers is respectively discharged. The top of the rear bearing seat 1 is provided with an exhaust cap 41 for oiling and exhausting, the top of the front bearing seat 21 is also provided with an exhaust cap, and the rear bearing seat 1 and the front bearing seat 21 are respectively provided with a graduated oil indicator capable of observing oil level.

Referring to fig. 1, 4 and 5 in combination, the oil chamber covers 48, 58 of the rear bearing seat 1 and the front bearing seat 21 are respectively and fixedly provided with

cooling coils

42, 53 at the inner sides of the lubricating oil chambers, the oil chamber covers 48, 58 are respectively and fixedly provided with joints for connecting the cooling coils, the

cooling coils

42, 53 are respectively communicated with the bearing seat

cooling water pipes

7, 8 at the outer sides of the oil chamber covers, the bearing seat

cooling water pipes

7, 8 are connected with an independent cooling water system, circulating cooling water is introduced into the

cooling coils

42, 53 to carry out heat exchange cooling on the lubricating oil and the inner cavity of the bearing seat, and therefore the working temperature of the rolling bearing is reduced in the high-speed rotation process of the pump shaft, and the service.

The flow rate of the two-stage double-suction horizontal condensate pump reaches 2500m³H, the lift is 350m, the working pressure is 4.0MPa, and the working temperature is 80 ℃.

The above embodiments describe the basic principles and main features of the present invention and the advantages of the present invention, and it should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only for the description of the specific working principle of the present invention, and without departing from the spirit and scope of the present invention, the present invention can also have various changes and improvements, and these changes and improvements all fall into the scope of the present invention, and the protection scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Two-stage double suction horizontal condensate pump, its characterized in that: comprises a pump body shell and two groups of impellers coaxially assembled in the pump body shell;

2. The two-stage, double-suction, horizontal condensate pump of claim 1, wherein: the pump body shell comprises a pump body and a front pump cover and a rear pump cover which are respectively assembled at two ends of the pump body along the pump shaft, and an inner volute chamber structure for accommodating the impeller is formed among the front pump cover, the pump body and the rear pump cover.

3. The two-stage, double-suction, horizontal condensate pump of claim 2, wherein: and pressure reducing sleeves are arranged between the pump body shell between the two sets of volute chambers and the pump shaft and between the pump body shell where the secondary suction chamber is located and the pump shaft.

4. The two-stage, double-suction, horizontal condensate pump of claim 2, wherein: the front pump cover and the rear pump cover are respectively assembled with the pump shaft through a shaft seal cooling gland and a mechanical seal, a circulating cooling flow passage connected with a shaft seal cooling cavity on the front pump cover and the rear pump cover is arranged in the shaft seal cooling gland, and the circulating cooling flow passage is connected with a shaft seal cooling water pipe.

5. The two-stage, double-suction, horizontal condensate pump of claim 4, wherein: the mechanical seal is connected with the mechanical seal flushing water pipe.

6. The two-stage, double-suction, horizontal condensate pump of claim 4, wherein: the inner side of the shaft seal cooling gland is communicated with a pressure relief recovery water pipe, and the pressure relief recovery water pipe is connected to a pump inlet of the pump body shell in a recovery mode.

7. The two-stage, double-suction, horizontal condensate pump of claim 1, wherein: and the top of the pump body is provided with an exhaust hole cover.

8. The two-stage, double suction, horizontal condensate pump of any one of claims 1 to 7, wherein: the pump shaft is rotatably supported through a rolling bearing assembled inside the bearing seat, a lubricating oil chamber is arranged on one end face of the rolling bearing inside the bearing seat, lubricating oil is filled inside the lubricating oil chamber, an oil slinger is fixedly assembled on a shaft section of the pump shaft corresponding to the lubricating oil chamber, and the oil slinger rotates along with the pump shaft to carry out oil slinging lubrication on the rolling bearing.

9. The two-stage, double-suction, horizontal condensate pump of claim 8, wherein: the bottom of the lubricating oil chamber is provided with a detachable oil chamber cover, and the oil chamber cover is provided with an oil drain valve.

10. The two-stage, double-suction, horizontal condensate pump of claim 9, wherein: the oil chamber cover is located the fixed cooling coil that is equipped with of lubricating oil chamber inner side, cooling coil is in the oil chamber cover outside and bearing frame condenser tube intercommunication, lets in recirculated cooling water to cooling coil inside and carries out the heat transfer cooling to lubricating oil and bearing frame inner chamber.