CN211599006U - Cooling water pump for nuclear power equipment - Google Patents
Cooling water pump for nuclear power equipment Download PDFInfo
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- CN211599006U CN211599006U CN201921224112.XU CN201921224112U CN211599006U CN 211599006 U CN211599006 U CN 211599006U CN 201921224112 U CN201921224112 U CN 201921224112U CN 211599006 U CN211599006 U CN 211599006U
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- impeller
- cooling water
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Abstract
The utility model relates to a cooling water pump for nuclear power equipment, which is a single-stage double-suction centrifugal pump and comprises a pump body, a pump cover, a large sealing ring, a small sealing ring, an impeller and the like, wherein a positioning bearing is installed back to back by adopting angular contact ball bearings, and a floating end bearing adopts a cylindrical roller bearing to bear the radial force of a rotor; the large sealing ring and the small sealing ring are respectively arranged on the pump body and positioned at two ends of the impeller; the sealing rings have different sizes and generate two forces with opposite directions on cover plates on two sides of the impeller when the pump operates, the resultant force of the two forces is an axial force with a constant direction, the positioning bearing is installed back to back by adopting angular contact ball bearings to bear a preset axial force, so that the pump shaft is always in a pulled state when the pump operates, the left and right movement of the rotor is avoided, meanwhile, the floating end bearing mainly bears the radial force of the rotor by adopting a cylindrical roller bearing, the deflection of the rotor under different working conditions is reduced, the engagement of the impeller and the sealing rings is prevented as far as possible, the efficient operation period of the pump is prolonged, and the times for replacing the sealing rings are reduced.
Description
Technical Field
The utility model relates to a cooling water pump, concretely relates to can reduce the rate of wear, the high-efficient operation period of extension pump reduces the nuclear power plant that changes the sealing ring number of times and uses cooling water pump.
Background
When the single-stage double-suction centrifugal operation is carried out, the areas outside the water suction chamber, the shaft and the sealing ring in the pump are low-pressure areas, and the areas inside the water pressing chamber and the sealing ring are high-pressure areas. To reduce volume loss due to leakage of high pressure liquid from the impeller into the low pressure region, a seal ring is typically installed between the high pressure region and the low pressure region of the pump between the pump body and the pump cover. The leakage amount is controlled by the clearance between the inner surface of the sealing ring and the outer surface of the impeller spigot.
When the single-stage double-suction centrifugal pump works, pumped media are conveyed from the water suction chamber to the water pressing chamber through the rotation of the impeller. Because the impeller is a rotating part and the sealing ring is a static part, the clearance between the two parts determines the leakage amount and further influences the overall efficiency of the pump. The smaller the clearance, the smaller the leakage amount, the higher the efficiency, but because the rotor rotates, a certain amount of axial vibration and radial vibration can occur, and the machining precision is not enough, the abrasion of the impeller and the sealing ring can be caused.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a cooling water pump for nuclear power plant, which can reduce the wear rate, prolong the high-efficiency operation period of the pump, and reduce the number of times of replacing sealing rings.
The utility model discloses a solve above-mentioned technical problem through following technical scheme: a cooling water pump for nuclear power equipment is a single-stage double-suction centrifugal pump, and comprises: the pump comprises a positioning bearing, a pump body, a shaft, a small sealing ring, an impeller, a large sealing ring, a pump cover and a floating end bearing. The positioning bearing is installed back to back by adopting angular contact ball bearings, and the floating end bearing adopts a cylindrical roller bearing to bear the radial force of the rotor.
The inner diameter is large; the inner diameter of the small sealing ring is smaller than that of the large sealing ring. The large sealing ring and the small sealing ring are respectively arranged on the pump body and positioned at two ends of the impeller.
The small sealing ring is arranged on the side close to the positioning bearing, and the diameter of the excircle of the corresponding impeller seam allowance is smaller than that of the excircle of the large sealing ring arranged on the other side; the large sealing ring is arranged on the side close to the floating end bearing.
In a specific embodiment of the present invention; during installation, the large sealing ring and the small sealing ring are pressed between the pump body and the pump cover, and the inner surfaces of the large sealing ring and the small sealing ring are in clearance fit with the outer surface of the impeller spigot.
In a specific embodiment of the present invention; the outer circumferential surfaces of the large sealing ring and the small sealing ring are provided with bulges, and the pump body is provided with a groove corresponding to the bulges.
In a specific embodiment of the present invention; the outer circumferential surfaces of the large sealing ring and the small sealing ring are provided with grooves, and the pump body is provided with bulges corresponding to the grooves.
In a specific embodiment of the present invention; the positioning bearing and the floating end bearing are both arranged in the bearing body.
In a specific embodiment of the present invention; the bearing body is an integral bearing body, and a bearing gland is arranged on the bearing body.
In a specific embodiment of the present invention; the bearing gland is fixed with the bearing body through a screw.
The utility model discloses an actively advance the effect and lie in: the utility model provides a cooling water pump for nuclear power generating equipment has following advantage: the utility model provides a cooling water pump for nuclear power equipment, the sealing ring variation in size produces two variation in size on the impeller both sides apron when the pump operates, opposite direction's power, the resultant force of two power is the invariable axial force of a direction, positioning bearing adopts angular contact ball bearing back to back of the body type installation in order to bear predetermined axial force, make the pump shaft be in the state of pulling all the time when the pump operates, it moves to avoid the rotor to control, the end bearing that floats simultaneously adopts cylindrical roller bearing mainly to bear rotor radial force, reduce the amount of deflection of rotor under different operating modes, thereby prevent as far as possible that impeller and sealing ring from taking place the interlock, reduce the rate of wear, the high-efficient operation of extension pump, reduce and change the sealing ring number of times.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic diagram of the stress in different areas of the present invention.
Fig. 3 is a partial schematic view of fig. 2.
The utility model discloses the name that well reference numeral corresponds:
the pump comprises a positioning bearing 1, a pump body 2, a shaft 3, a small sealing ring 4, an impeller 5, a large sealing ring 6, a pump cover 7, a floating end bearing 8, a protrusion 9 and a groove 10.
Detailed Description
The following provides a preferred embodiment of the present invention with reference to the accompanying drawings to explain the technical solutions of the present invention in detail.
Fig. 1 is the utility model discloses an overall structure schematic diagram, fig. 2 is the utility model discloses in not regional atress schematic diagram, fig. 3 is the local schematic diagram of fig. 2, refer to fig. 1-3, the utility model relates to a cooling water pump for nuclear power generating equipment, this cooling water pump for nuclear power generating equipment is the single-stage double suction centrifugal pump, and this cooling water pump for nuclear power generating equipment includes: the pump comprises a positioning bearing 1, a pump body 2, a pump cover 7, a large sealing ring 6, a small sealing ring 4, an impeller 5 and a floating end bearing 8, wherein the positioning bearing 1 is installed back to back by adopting angular contact ball bearings, and the floating end bearing 8 adopts a cylindrical roller bearing to bear the radial force of a rotor.
The utility model discloses in, the big sealing ring 6 that is of internal diameter, the internal diameter is less than being little sealing ring 4 of big sealing ring. The large sealing ring 6 and the small sealing ring 4 are respectively arranged on the pump body and are positioned at two ends of the impeller 5.
The small sealing ring 4 is arranged on the side close to the positioning bearing, and the diameter of the excircle of the corresponding impeller seam allowance is smaller than that of the excircle of the large sealing ring arranged on the other side; the large seal ring 6 is mounted near the floating end bearing side.
In the specific implementation process, the large sealing ring and the small sealing ring are pressed between the pump body and the pump cover during installation, and the inner surfaces of the large sealing ring and the small sealing ring are in clearance fit with the outer surface of the impeller spigot.
In the specific implementation process, the outer circumferential surfaces of the large sealing ring and the small sealing ring are provided with protrusions, and the pump body is provided with a groove 10 corresponding to the protrusion 9. The following may also be used: the outer circumferential surfaces of the large sealing ring and the small sealing ring are provided with grooves, and the pump body is provided with bulges corresponding to the grooves.
The positioning bearing and the floating end bearing are both arranged in the bearing body; the bearing body is integral bearing body, is provided with the bearing gland on the bearing body, and the bearing gland passes through the screw to be fixed with the bearing body.
The utility model discloses a reduce the high-pressure liquid after impeller 5 does work and reveal to the low-pressure area and cause the loss, install big sealing ring 6, little sealing ring 4 between the high-pressure area of the pump and the low-pressure area between the pump body 2 and pump cover 7. The leakage amount is controlled by the clearance between the inner surface of the seal ring and the outer surface of the spigot of the impeller 5. Two kinds of sealing rings of large and small sizes are arranged between a water suction chamber and a water pumping chamber of the single-stage double-suction centrifugal pump, the small sealing ring 4 is positioned on the side of the positioning bearing, and the large sealing ring 6 is positioned on the other side.
When the single-stage double-suction centrifugal pump works, the impeller 5 is a rotating part, the small sealing ring 4 and the large sealing ring 6 are static parts, and the clearance between the two parts determines the leakage amount so as to influence the volumetric efficiency of the pump. The smaller the clearance, the smaller the leakage amount, the higher the efficiency, but when the rotor rotates, a certain amount of axial and radial vibration occurs, and the machining precision is not enough, so that the impeller 5, the small seal ring 4 and the large seal ring 6 are abraded.
As shown in fig. 3, when the double-suction centrifugal pump operates, the pressure F1 (P2 (pi) (D) is applied to the impeller on the small seal ring side due to the pressure P1 in the low pressure region and the pressure P2 in the high pressure region2-d12) (4), the pressure F2 ═ P2 ═ pi (D) applied to the large seal ring side impeller2-d22) And 4), the resultant axial force of the rotor during the pump operation is F1-F2. The positioning bearing is installed in a back-to-back B/DB type by adopting angular contact ball bearings, and the floating end bearing mainly bears the radial force of the rotor by adopting a cylindrical roller bearing. Due to the fixation of the positioning bearing, the resultant force of the axial force enables the rotor to be in a stretching state all the time. The pulling force can avoid the rotor from moving from left to right, and the rotors are reduced in different working conditionsAnd due to the deflection, the impeller and the sealing ring are prevented from being occluded as much as possible, the abrasion speed is reduced, the efficient operation period of the pump is prolonged, and the frequency of replacing the sealing ring is reduced.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.
Claims (7)
1. The utility model provides a cooling water pump for nuclear power equipment which characterized in that: the cooling water pump for nuclear power equipment is a single-stage double-suction centrifugal pump, and comprises:
the pump comprises a positioning bearing, a pump body, a shaft, a small sealing ring, an impeller, a large sealing ring, a pump cover and a floating end bearing;
the positioning bearings are installed back to back by adopting angular contact ball bearings, and the floating end bearings adopt cylindrical roller bearings to bear the radial force of the rotor;
the inner diameter is large; the inner diameter of the small sealing ring is smaller than that of the large sealing ring;
the large sealing ring and the small sealing ring are respectively arranged on the pump body and positioned at two ends of the impeller;
the small sealing ring is arranged on the side close to the positioning bearing, and the diameter of the excircle of the corresponding impeller seam allowance is smaller than that of the excircle of the large sealing ring arranged on the other side; the large sealing ring is arranged on the side close to the floating end bearing.
2. The cooling water pump for nuclear power equipment as claimed in claim 1, wherein: when the impeller is installed, the large sealing ring and the small sealing ring are pressed between the pump body and the pump cover, and the inner surfaces of the large sealing ring and the small sealing ring are in clearance fit with the outer surface of the spigot of the impeller.
3. The cooling water pump for nuclear power equipment as claimed in claim 1, wherein: the outer circumferential surfaces of the large sealing ring and the small sealing ring are provided with bulges, and the pump body is provided with a groove corresponding to the bulges.
4. The cooling water pump for nuclear power equipment as claimed in claim 1, wherein: the outer circumferential surfaces of the large sealing ring and the small sealing ring are provided with grooves, and the pump body is provided with bulges corresponding to the grooves.
5. The cooling water pump for nuclear power equipment as claimed in claim 1, wherein: the positioning bearing and the floating end bearing are both arranged in the bearing body.
6. The cooling water pump for nuclear power plants according to claim 5, characterized in that: the bearing body is an integral bearing body, and a bearing gland is arranged on the bearing body.
7. The cooling water pump for nuclear power plant as claimed in claim 6, wherein: the bearing gland is fixed with the bearing body through a screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921224112.XU CN211599006U (en) | 2019-07-31 | 2019-07-31 | Cooling water pump for nuclear power equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921224112.XU CN211599006U (en) | 2019-07-31 | 2019-07-31 | Cooling water pump for nuclear power equipment |
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| Publication Number | Publication Date |
|---|---|
| CN211599006U true CN211599006U (en) | 2020-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921224112.XU Active CN211599006U (en) | 2019-07-31 | 2019-07-31 | Cooling water pump for nuclear power equipment |
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| CN (1) | CN211599006U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113294377A (en) * | 2021-06-23 | 2021-08-24 | 上海凯泉泵业（集团）有限公司 | Sealing ring structure of double-suction pump for nuclear power |
-
2019
- 2019-07-31 CN CN201921224112.XU patent/CN211599006U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113294377A (en) * | 2021-06-23 | 2021-08-24 | 上海凯泉泵业（集团）有限公司 | Sealing ring structure of double-suction pump for nuclear power |
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