High-temperature centrifugal pump with self-cooling structure

Abstract

The high-temperature centrifugal pump with the self-cooling structure comprises a pump body, an impeller nut is arranged in the pump body, a key is arranged at one end of the impeller nut, a flange plate is arranged at one end of the pump body, a protective cover is arranged on the rear side of the flange plate, and impeller blades are arranged on the upper side and the lower side of the protective cover. A pump cover is fixedly arranged on one side of the protective cover, a pump shaft is arranged in the protective cover, a throttling ring is arranged on the outer wall of the pump shaft, one end of the pump shaft penetrates through the interior of the pump body, a water bearing is arranged on the side, located on the throttling ring, of the outer wall of the pump shaft, a bearing body is arranged in the pump body, and the water bearing is arranged in the bearing body. A liquid collecting chamber is arranged in the pump body and located above the pump shaft, a guide pipe is arranged at the upper end of the liquid collecting chamber, the pump cover can be lengthened, the special bearing body design can be achieved, a mechanical seal and a bearing are located at the natural cold end, a water cooling device does not need to be added, a graphite water bearing is added to serve as an auxiliary support, and an external cooling water circulation system does not need to be connected.

Description

Technical Field

[0001] The utility model relates to the technical field of high-temperature centrifugal pumps, in particular to a high-temperature centrifugal pump with a self-cooling structure. Background Technique

[0002] A high-temperature pump is a new type of pump that uses the working principle of a permanent magnet coupling to transmit torque without contact. When the prime mover drives the outer magnetic steel rotor, the inner magnetic steel rotor is driven to rotate synchronously through the action of the magnetic field. The inner magnetic steel rotor and the impeller are integrated, so as to achieve the purpose of driving the impeller to rotate without contact. It is used to transport clear water without solid particles or other liquids with physical and chemical properties similar to water, and the temperature of the transported medium is not higher than 220°C. It is applicable to fields such as energy, metallurgy, chemical industry, textile, papermaking, as well as boiler high-temperature hot water pressurized circulation transportation in hotels, bathrooms, and guesthouses, and urban heating systems.

[0003] There are certain problems in the use of existing high-temperature centrifugal pumps. Generally, existing conventional high-temperature pumps adopt a double-shell structure, and water cooling is used in the middle, which will cause a large amount of water resource waste. Some also add a heat sink structure to the pump cover. This method has an insignificant cooling effect, resulting in a greatly shortened service life of the mechanical seal and bearings. The pump cover cannot be lengthened, and a special shaft and bearing body design is adopted to keep the mechanical seal and bearings away from the pump cavity, so that the liquid at the mechanical seal is fully cooled, reducing the use of the centrifugal pump. In view of the above problems, a high-temperature centrifugal pump with a self-cooling structure is proposed for improvement and upgrading. Content of the Utility Model

[0004] The purpose of the utility model is to provide a high-temperature centrifugal pump with a self-cooling structure to solve the problems raised in the above background technique.

[0005] To solve the above problems, the following technical solutions are provided:

[0006] Design a high-temperature centrifugal pump with a self-cooling structure, including a pump body. An impeller nut is arranged inside the pump body, and a key is arranged at one end of the impeller nut. A flange is arranged at one end of the pump body, and a protective cover is arranged behind the flange. Impeller blades are arranged on both the upper and lower sides of the protective cover, and a pump cover is fixedly arranged on one side of the protective cover. A pump shaft is arranged inside the protective cover, and a throttle ring is arranged on the outer wall of the pump shaft. One end of the pump shaft penetrates into the pump body, and a water bearing is arranged on the outer wall of the pump shaft on one side of the throttle ring. A bearing body is arranged inside the pump body, and a water bearing is arranged inside the bearing body.

[0007] Furthermore, a liquid collecting chamber is arranged above the pump shaft inside the pump body, a conduit is arranged at the upper end of the liquid collecting chamber, and a water valve is arranged at one end of the conduit.

[0008] Further, a mechanical seal plate is provided in the middle of the pump shaft inside the pump body, and a mechanical seal seat is provided on one side of the mechanical seal plate, and the mechanical seal seat is arranged on the outer wall of the pump shaft.

[0009] Further, a skeleton seal is provided on one side of the mechanical seal seat and the skeleton seal is arranged outside the pump shaft, and a bearing member is provided outside the mechanical seal seat and the shape of the bearing member is set to be cylindrical.

[0010] Further, a bearing gland is provided on one side of the bearing member, and a positioning sleeve is arranged on the outer wall of the pump shaft in the middle of the bearing gland, and the positioning sleeve is made of rubber material.

[0011] Further, two cooling fans are symmetrically arranged on one side of the bearing gland, and a fan cover is arranged outside the cooling fans, and a plurality of locking nuts are arranged on the outer wall of the pump shaft between the two cooling fans.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. Components such as a throttle ring, a water bearing, a pump shaft, a collecting chamber, and a cooling fan are arranged in the device of the present utility model. By adopting impeller blades with back blades and adding a throttle ring at the pump cover, the liquid flowing through the throttle ring is naturally cooled through the small cavity of the lengthened pump cover, so that the temperature at the water bearing is not too high. In this way, the gap between the water bearing and the pump shaft is relatively stable and will not be stuck due to seizure. It is beneficial to lengthen the pump cover and the special bearing body design, so that the mechanical seal and the bearing are in the natural cold end without the need for a water cooling device. Adding a graphite water bearing as an auxiliary support eliminates the need for an external cooling water circulation system, which not only saves a large amount of water resources but also saves procurement costs.

[0014] Referring to the following description and the accompanying drawings, specific embodiments of the present utility model are disclosed in detail, indicating the ways in which the principles of the present utility model can be employed. It should be understood that the embodiments of the present utility model are not limited in scope thereby. Within the spirit and terms of the appended claims, the embodiments of the present utility model include many changes, modifications, and equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0016] Figure 1 is a schematic diagram of the overall structure of a high-temperature centrifugal pump with a self-cooling structure according to the present utility model;

[0017] Figure 2 is a schematic diagram of the side structure of a high-temperature centrifugal pump with a self-cooling structure according to the present utility model;

[0018] Figure 3 For Figure 1 the overall sectional structure diagram at the [specific location].

[0019] In the figure: 1. Pump body; 2. Impeller nut; 21. Flange; 3. Impeller blade; 31. Protective cover; 4. Key; 5. Pump cover; 6. Throttle ring; 7. Pump shaft; 8. Water bearing; 9. Bearing body; 10. Mechanical seal plate; 11. Mechanical seal seat; 12. Skeleton seal; 13. Bearing part; 14. Bearing gland; 15. Cooling fan; 16. Fan housing; 17. Positioning sleeve; 18. Locking nut. Specific embodiments

[0020] To make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] As Figure 1 - Figure 3 shown, the design of a high-temperature centrifugal pump with a self-cooling structure provided in this embodiment includes a pump body 1. An impeller nut 2 is arranged inside the pump body 1, and a key 4 is arranged at one end of the impeller nut 2. A flange 21 is arranged at one end of the pump body 1, and a protective cover 31 is arranged behind the flange 21. Impeller blades 3 are arranged on both the upper and lower sides of the protective cover 31, and a pump cover 5 is fixedly arranged on one side of the protective cover 31. A pump shaft 7 is arranged inside the protective cover 31, and a throttle ring 6 is arranged on the outer wall of the pump shaft 7. One end of the pump shaft 7 penetrates into the inside of the pump body 1. A water bearing 8 is arranged on the outer wall of the pump shaft 7 on one side of the throttle ring 6. A bearing body 9 is arranged inside the pump body 1, and the water bearing 8 is arranged inside the bearing body 9.

[0022] Preferably, a liquid collecting chamber is arranged above the pump shaft 7 inside the pump body 1. A conduit is arranged at the upper end of the liquid collecting chamber, and a water valve is arranged at one end of the conduit. A mechanical seal plate 10 is arranged in the middle of the pump shaft 7 inside the pump body 1, and a mechanical seal seat 11 is arranged on one side of the mechanical seal plate 10. And the mechanical seal seat 11 is arranged on the outer wall of the pump shaft 7. A skeleton seal 12 is arranged on one side of the mechanical seal seat 11 and the skeleton seal 12 is arranged outside the pump shaft 7. A bearing part 13 is arranged outside the mechanical seal seat 11, and the shape of the bearing part 13 is set to be cylindrical.

[0023] By arranging the mechanical seal seat 11 to limit the pump shaft 7, preventing the rotation from slipping and offsetting, and using the bearing part 13 to stabilize the pump shaft 7, the mechanical seal plate 10 can directly use a conventional mechanical seal, greatly reducing the use and maintenance costs. The special designs of the pump cover 5, water bearing shaft 8, and bearing body 9 effectively isolate the temperature transmission between the pump body 1 and the mechanical seal cavity.

[0024] Preferably, a bearing gland 14 is provided on one side of the bearing member 13, and a positioning sleeve 17 is provided in the middle of the bearing gland 14 on the outer wall of the pump shaft 7. The positioning sleeve 17 is made of rubber material. Two cooling fans 15 are symmetrically provided on one side of the bearing gland 14, and a fan housing 16 is provided outside the cooling fans 15. A number of locking nuts 18 are provided on the outer wall of the pump shaft 7 between the two cooling fans 15.

[0025] By providing the cooling fans 15 to cool the pump body 1 when the temperature is too high, there is no need for water cooling operation, and the locking nuts 18 are used to limit and fix it.

[0026] The working principle and working process of the present utility model: Since the operating pressure increases exponentially with the increase of temperature, the cavity pressure of the high-temperature pump is relatively high. The impeller blade 3 is provided with back blades and a throttle ring 6 is added at the pump cover 5. The liquid flowing through the throttle ring 6 is naturally cooled through the small cavity of the lengthened pump cover 5, so that the temperature at the water bearing 8 is not too high. In this way, the gap between the water bearing 8 and the pump shaft 7 is controlled relatively stably and will not be stuck due to shaft seizure. The bearing body 9 is externally provided with heat dissipation fins, so that the liquid in the mechanical seal cavity remains relatively low temperature under double natural cooling conditions. A collecting chamber is provided at the highest point of the mechanical seal area to collect the generated gas, and the valve can be used to exhaust gas when the system is in a stopped state and when starting the equipment. The mechanical seal will be sufficiently lubricated, and the service life of the mechanical seal is extended. If the temperature of the conveyed medium is between 180-240 degrees, air cooling can be added to the cooling fan 15 at the end of the bearing without water cooling, and finally the heat is discharged through the fan housing 16.

[0027] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, terms such as "installation", "provided with", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0028] In the description of this embodiment, the orientation or positional relationship terms such as "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

Claims

1. A high-temperature centrifugal pump with a self-cooling structure, characterized in that: The invention comprises a pump body (1), wherein an impeller nut (2) is arranged inside the pump body (1), and a key (4) is arranged at one end of the impeller nut (2); a flange (21) is arranged at one end of the pump body (1), and a protective cover (31) is arranged at the rear side of the flange (21); impeller blades (3) are arranged on the upper and lower sides of the protective cover (31), and a pump cover (5) is fixedly arranged on one side of the protective cover (31); a pump shaft (7) is arranged inside the protective cover (31), and a throttling ring (6) is arranged on the outer wall of the pump shaft (7); one end of the pump shaft (7) passes through the interior of the pump body (1), and a water bearing (8) is arranged on the outer wall of the pump shaft (7) on one side of the throttling ring (6); a bearing body (9) is opened inside the pump body (1), and a water bearing (8) is arranged inside the bearing body (9).

2. A high-temperature centrifugal pump with a self-cooling structure according to claim 1, characterized in that: A liquid collecting chamber is arranged inside the pump body (1) above the pump shaft (7), a conduit is arranged at the upper end of the liquid collecting chamber and a water valve is arranged at one end of the conduit.

3. A high temperature centrifugal pump with a self-cooling structure according to claim 1, characterized in that: An organic sealing plate (10) is arranged in the middle of the pump shaft (7) inside the pump body (1), an organic sealing seat (11) is arranged on one side of the organic sealing plate (10), and the organic sealing seat (11) is arranged on the outer wall of the pump shaft (7).

4. A high-temperature centrifugal pump with a self-cooling structure according to claim 3, characterized in that: A skeleton seal (12) is arranged on one side of the mechanical seal seat (11), and the skeleton seal (12) is arranged on the outside of the pump shaft (7); a bearing component (13) is arranged on the outside of the mechanical seal seat (11), and the shape of the bearing component (13) is set to be cylindrical.

5. A high temperature centrifugal pump with a self-cooling structure according to claim 4, characterized in that: A bearing cover (14) is arranged on one side of the bearing member (13), and a positioning sleeve (17) is arranged on the outer wall of the pump shaft (7) in the middle of the bearing cover (14), and the positioning sleeve (17) is made of rubber material.

6. A high temperature centrifugal pump with a self-cooling structure according to claim 5, characterized in that: Two cooling fans (15) are symmetrically arranged on one side of the bearing cover (14), and a fan cover (16) is arranged outside the cooling fan (15). A plurality of locking nuts (18) are arranged on the outer wall of the pump shaft (7) between the two cooling fans (15).

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