A shielding pump balance disc balance axial force pressure relief structure

Abstract

The utility model discloses a kind of shielding pump balance disc balanced axial force pressure relief structure, including shaft, shaft is located at the position of tail inner cavity, bearing seat, balance disc, last stage impeller, secondary impeller and first stage impeller are sequentially provided from front to back, gap is equipped between bearing seat and balance disc, last stage impeller, secondary impeller and first stage impeller inner end are all equipped with sequentially communicated flow channel, flow channel is communicated with gap, it is related to shielding pump technical field, leakage medium at balance disc place is actively induced to last stage impeller hub chamber, after balance disc and interstage leakage medium are gathered, guide to first stage impeller inlet chamber, the pressure rebalancing and recycling of leakage medium are realized by internal flow channel, can avoid to atmospheric side leakage risk, save cost, optimize installation space, it is convenient to install.

Description

Technical Field

[0001] This utility model belongs to the field of shielded pump technology, specifically a shielded pump balance disc structure for balancing axial force and relieving pressure. Background Technology

[0002] A canned motor pump is a fully enclosed pump. Its motor stator and rotor are isolated by a non-magnetic, corrosion-resistant thin-walled cylinder. The motor stator provides a rotating magnetic field and drives the rotor to rotate. The motor rotor and pump shaft are internally connected, eliminating the rotating shaft sealing device found in traditional centrifugal pumps, thus preventing leakage of the pumped liquid and environmental pollution.

[0003] The existing axial force balancing scheme involves creating a through hole at the rear end of the balancing disc, through which fluid is guided to the pump inlet via a balancing pipe. The balancing disc is installed behind the final stage impeller of a multi-stage centrifugal pump. By dynamically adjusting the gap between the balancing disc and the balancing ring, a reverse pressure differential is generated to counteract the axial force generated by the impeller. The disadvantages of the balancing pipe structure are its high complexity, large space occupation, and reliance on multiple welded joints and stuffing box seals. This design not only increases the difficulty of manufacturing and maintenance but also introduces potential media leakage risks, affecting the reliability of system operation. Utility Model Content

[0004] The purpose of this invention is to provide a shielded pump balance disc structure for balancing axial force and relieving pressure, so as to solve the problems mentioned in the background art.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A shielded pump axial force balancing and pressure relief structure includes a rotating shaft located in the inner cavity of the tail section. From front to back, a bearing housing, a balance disc, a final stage impeller, a secondary stage impeller, and a first stage impeller are arranged sequentially. A gap is provided between the bearing housing and the balance disc. The inner ends of the final stage impeller, the secondary stage impeller, and the first stage impeller are all provided with sequentially connected flow channels, which are connected to the gap.

[0007] Preferably, a guide groove is provided on the outer side of the flow channel front end of the last stage impeller to collect the leakage medium at the balance disc.

[0008] Preferably, a balance disc cover is provided on the outer side of the balance disc.

[0009] Preferably, the radial clearance between the rear end of the balance disc and the bearing housing is 0.5-2cm.

[0010] Preferably, the leaked medium at the balance disc is diverted through the gap to the hub chamber of the last stage impeller and guided along the flow channel to the inlet chamber of the first stage impeller.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0012] In this invention, the leaking medium at the balance disc is actively diverted to the hub chamber of the last stage impeller. After the leaking medium from the balance disc and the interstage is collected, it is guided to the inlet chamber of the first stage impeller. The pressure rebalancing and recycling of the leaking medium are achieved through the internal flow channel, which can avoid the risk of leakage to the atmosphere, save costs, optimize installation space, and facilitate installation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is an enlarged view of the structure at point A of this utility model;

[0015] Figure 3 This is a schematic diagram of the final stage impeller structure of this utility model;

[0016] In the diagram: 1. Shaft; 2. Bearing housing; 3. Balance disc; 4. Final stage impeller; 5. Secondary stage impeller; 6. First stage impeller; 7. Flow channel; 8. Balance disc cover; 9. Guide groove. Detailed Implementation

[0017] The specific embodiments of this utility model are described in detail below.

[0018] The "range" disclosed in this utility model is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if a range of 10–50 is listed for a specific parameter, it is also expected that ranges of 10–40 and 20–50 are also included. Furthermore, if the minimum range values ​​are listed as 1 and 2, and the maximum range values ​​are listed as 3, 4, and 5, then the following ranges are all expected: 1–3, 1–4, 1–5, 2–3, 2–4, and 2–5. In this application, unless otherwise stated, the numerical range "a–b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0–5" means that all real numbers between "0–5" have been listed herein; "0–5" is merely a shortened representation of these numerical combinations.

[0019] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0020] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0021] Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0022] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0023] Unless otherwise specified, the reaction will proceed under normal temperature and pressure conditions.

[0024] Unless otherwise specified, all parts or percentages are by weight or by weight percentage.

[0025] In this invention, all the substances used are known substances that can be purchased or synthesized by known methods.

[0026] In this invention, all the devices or equipment used are conventional devices or equipment known in the art and are readily available.

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0028] Example:

[0029] A shielded pump balance disc structure for balancing axial force and relieving pressure, such as Figure 1-3 As shown, it includes a rotating shaft 1, which is located in the inner cavity of the tail section. From front to back, there are bearing seats 2, balance discs 3, final impellers 4, secondary impellers 5 and first-stage impellers 6. There is a gap between the bearing seats 2 and the balance discs 3. The inner ends of the final impellers 4, secondary impellers 5 and first-stage impellers 6 are all provided with sequentially connected flow channels 7, which are connected to the gap.

[0030] In one possible implementation, a guide groove 9 is provided on the outer side of the flow channel 7 of the final stage impeller 4 to collect the leakage medium at the balance disc 3.

[0031] In one possible implementation, a balance disc cover 8 is provided on the outside of the balance disc 3.

[0032] In one possible implementation, the radial clearance between the rear end of the balance disc 3 and the bearing housing 2 is 0.5-2 cm.

[0033] In one possible implementation, the leaked medium at the balance disc 3 is diverted through the gap to the hub chamber of the last stage impeller and guided along the flow channel 7 to the inlet chamber of the first stage impeller.

[0034] By adopting the above technical solution:

[0035] By appropriately increasing the radial clearance between the rear end of the balance disc and the bearing housing, the leaked medium at the balance disc is actively diverted to the hub chamber of the final stage impeller 4. Drainage channels are created in the hub area of ​​the rear cover plates of each impeller stage to collect the leaked medium between the balance disc 3 and the bearing housing 2, and then guide it to the inlet chamber of the first stage impeller 6. This structural design replaces the traditional external balancing pipeline, achieving pressure rebalancing and recycling of the leaked medium through internal flow channels.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A balance disc structure for balancing axial force and relieving pressure in a canned pump, characterized in that: Includes a rotating shaft (1), which is located in the inner cavity of the tail section. From front to back, there are bearing seats (2), balance discs (3), final impellers (4), secondary impellers (5) and first-stage impellers (6). There is a gap between the bearing seats (2) and the balance discs (3). The inner ends of the final impellers (4), secondary impellers (5) and first-stage impellers (6) are provided with sequentially connected flow channels (7), which are connected to the gaps.

2. The axial force balancing and pressure relief structure for a shielded pump as described in claim 1, characterized in that: The flow channel (7) of the final stage impeller (4) has a guide groove (9) on the outer side of the front end, which is used to collect the leakage medium at the balance disc (3).

3. The axial force balancing and pressure relief structure for a shielded pump as described in claim 1, characterized in that: The balance disc (3) is provided with a balance disc cover (8) on its outer side.

4. The axial force balancing and pressure relief structure for a shielded pump as described in claim 1, characterized in that: The radial clearance between the rear end of the balance disc (3) and the bearing housing (2) is 0.5-2cm.

5. The axial force balancing and pressure relief structure for a shielded pump as described in claim 1, characterized in that: The leaked medium at the balance disc (3) is diverted through the gap to the hub chamber of the last stage impeller and guided along the flow channel (7) to the inlet chamber of the first stage impeller.

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