Internal backflow structure for leakage medium of wear ring of high-temperature pump
By setting up a return chamber and return channel in the high-temperature pump, the leakage medium is circulated and returned with the pump inlet medium, which solves the complex structure and high cost of medium leakage and return pipes in the high-temperature pump, and achieves stable return and structure simplification of the medium .
Patent Information
- Application Number
- CN202420024927.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-05
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-01-05
AI Technical Summary
During operation of the high-temperature pump, due to the large gap between the impeller and the port ring, the seal fails and the medium leakage increases. The existing return pipe structure is complex and costly, making it difficult to cope with thermal expansion stress.
An internal reflow structure of leakage medium with high-temperature pump port ring is designed. By setting a reflow chamber and a reflow channel in the pump body, the leakage medium flows into the reflow chamber through the reflow channel and circulates back together with the pump inlet medium, avoiding the problem of thermal expansion stress. Simple structure and low cost.
The stable reflux circulation of the medium is achieved, thermal expansion stress is avoided, structure is simplified, cost is reduced, and pump usage efficiency is improved.
Smart Images
Figure CN222228967U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of centrifugal pumps, in particular to an internal reflux structure for leakage medium of a high-temperature pump orifice ring. Background Art
[0002] The pump impeller is usually equipped with a replaceable mouth ring, which can reduce the backflow of the outlet medium back to the inlet medium and play a sealing role. If the gap between the impeller and the mouth ring is too large, the seal between the mouth ring and the impeller will fail during the operation of the pump, and the leakage of the medium at the mouth ring will increase, thereby reducing the efficiency of the pump.
[0003] In order to maintain the pressure balance inside the pump, a return pipe is proposed to guide the leaking medium back to the inlet. Figure 1 , which shows the existing high-temperature pump port ring leakage medium reflux structure, the reflux pipe 1 'is externally connected to the pump body 2 ', connecting the pump cavity 3 'and the pump inlet 4 ', thereby guiding the leakage medium to re-enter the pump body through the pump inlet 4 '.
[0004] However, high-temperature pumps are often in a high-temperature and high-pressure working environment. The external return pipe is affected by the high temperature and has a large thermal expansion stress. In order for the return pipe to balance the expansion stress, high requirements are placed on the structural characteristics of the return pipe, which makes the structure of the return pipe complex, more affected by the outside world, and more expensive.
[0005] Therefore, how to prevent the high-temperature pump port ring leakage medium reflux structure from generating thermal expansion stress, thereby simplifying the reflux structure and reducing costs has become an urgent problem to be solved in this field. Utility Model Content
[0006] In view of the defects of the prior art, the purpose of the utility model is to provide a high-temperature pump port ring leakage medium internal reflux structure which does not generate thermal expansion stress and has a simple structure and low cost.
[0007] In order to achieve the above-mentioned purpose, the utility model provides a high-temperature pump orifice ring leakage medium internal reflux structure, comprising a pump body and an impeller and a guide vane arranged in the pump body, a orifice ring is arranged on the outer side of the impeller, and there is a orifice ring gap between the orifice ring and the impeller, and also includes:
[0008] A reflux chamber, the reflux chamber is arranged at the pump inlet of the pump body and extends horizontally, and is communicated with the pump inlet.
[0009] A reflux channel is arranged in the pump body, one end of which is connected to the pump chamber of the pump body, and the other end is arranged in the reflux chamber, so that the medium in the pump chamber can flow into the reflux chamber through the reflux channel and into the pump inlet.
[0010] Furthermore, the bottom inner wall of the reflux chamber is configured so that two ends are higher than the middle part.
[0011] Furthermore, the caliber and number of the reflux channels are configured so that the reflux medium in the pump cavity flowing to the reflux cavity through the reflux channels and the leakage medium leaking from the mouth ring gap reach a balance.
[0012] Furthermore, the guide vane is arranged outside the impeller.
[0013] Further, the guide vane comprises a guide vane body and a guide vane cover plate, and the guide vane is configured such that the guide vane cover plate is arranged at the front end of the impeller, and the guide vane body is arranged at the rear end of the impeller.
[0014] Furthermore, the pump body also includes a pump outlet, and the pump outlet is axially connected to the impeller.
[0015] The utility model provides an internal reflux structure for medium leaking from a high-temperature pump orifice ring. Since the reflux cavity extends from the pump inlet, a reflux channel can be cleverly arranged inside the pump body, so that the medium leaking from the orifice ring gap flows into the reflux cavity through the reflux channel, and then flows into the pump inlet, flows to the impeller inlet together with the medium at the pump inlet, and circulates back inside the pump body. In this way, the temperature of the reflux channel will not change too much, and there is no need to consider the problem of thermal expansion stress. At the same time, the structure is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The present invention is further described below in conjunction with the accompanying drawings and specific implementations.
[0017] Figure 1 This is a schematic diagram of the existing high-temperature pump port ring leakage medium reflux structure;
[0018] Figure 2 A schematic diagram of the internal reflux structure of the leakage medium of the high-temperature pump port ring provided by the utility model;
[0019] Reference numerals:
[0020] 1'. Reflux pipe; 2'. Pump body; 3'. Pump chamber; 4'. Pump inlet;
[0021] 1. Pump body; 11. Pump inlet; 12. Pump outlet; 13. Pump chamber;
[0022] 2. Guide vane; 21. Guide vane body; 22. Guide vane cover;
[0023] 3. Impeller; 31. Mouth ring; 32. Mouth ring gap; 4. Reflux channel; 5. Reflux chamber; 51. Bottom inner wall. DETAILED DESCRIPTION
[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.
[0025] See also Figure 2 , which shows an example of the internal reflux structure of the leakage medium of the high-temperature pump port ring provided by the utility model.
[0026] As can be seen from the figure, the internal reflux structure of the leakage medium of the high-temperature pump port ring in this example mainly includes a pump body 1 and guide vanes 2, an impeller 3, a reflux channel 4 and a reflux chamber 5 arranged in the pump body 1.
[0027] The reflux channel 4 and the reflux chamber 5 can cooperate to reflux the medium leaking from the guide vane ring in the pump body 1 inside the pump body 1 .
[0028] The pump body 1 includes a pump inlet 11 and a pump outlet 12. The pump inlet 11 is radially connected to the impeller 3, and the pump outlet 12 is axially connected to the impeller 3. The pump body 1 also includes a pump chamber 13, which is arranged at the rear end of the impeller 3.
[0029] The guide vane 2 includes a guide vane body 21 and a guide vane cover plate 22 , so that when the guide vane 2 is arranged outside the impeller 3 , the guide vane cover plate 22 is arranged at the front end of the impeller 3 , and the guide vane body 21 is arranged at the rear end of the impeller 3 .
[0030] When the high-temperature pump thus constructed is in operation, the medium can enter the pump body 1 from the pump inlet 11, flow through the guide vane cover plate 22, and enter the impeller 3 through the flow channel on the guide vane cover plate 22. The impeller 3 drives the medium to rotate, thereby increasing the kinetic energy and pressure of the medium, and the medium flows into the guide vane body 21, and the guide vane body 21 finally transmits the medium to the pump outlet 12 of the pump body 1.
[0031] A mouth ring 31 is provided on the outer side of the impeller 3, and a mouth ring gap 32 exists between the impeller 3 and the mouth ring 31. Therefore, when the medium flows from the impeller 3 into the guide vane body 21 and the guide vane body 21 transmits the medium to the pump outlet 12 of the pump body 1, a large amount of the medium will flow to the pump outlet 12 through the guide vane body 21, while a small amount of the medium will leak into the pump cavity 13 through the mouth ring gap 32, causing the mouth ring 31 to leak the medium.
[0032] In order to return the leaked medium in the pump chamber 13 to the pump inlet 11 and re-enter the impeller 3 and the guide vane 2 from the pump inlet 11 as reflux medium to achieve medium stability in the pump body 1, a reflux channel 4 and a reflux chamber 5 are provided in the pump body 1.
[0033] The reflux channel 4 is arranged inside the pump body 1, with one end connected to the pump cavity 13 and the other end connected to the pump inlet 11. In order to ensure that sand is not easily accumulated in the reflux channel 4 when the pump is running, the reflux channel 4 is preferably a vertical hole, thereby connecting the reflux channel 4 to the pump inlet 11 through the reflux cavity 5.
[0034] The reflux chamber 5 is arranged at the pump inlet 11, is communicated with the pump inlet 11, and horizontally extends along both sides of the pump inlet 11, and is communicated with the reflux channel 4, so that the leakage medium in the pump chamber 13 can flow from the reflux channel 4 to the reflux chamber 5 due to gravity, and the reflux medium formed in the reflux chamber 5 flows into the pump inlet 11, and enters the impeller 3 and the guide vane 2 together with the medium in the pump inlet 11, and circulates and refluxes inside the pump body 1.
[0035] Furthermore, in order to allow the medium in the reflux channel 4 to flow smoothly into the pump inlet 11, the bottom inner wall 51 of the reflux chamber 5 is configured with both ends higher than the middle, so that when the medium in the reflux channel 4 flows into the reflux chamber 5, it flows into the pump inlet 11 along the inner wall 51 of the bottom of the reflux chamber 5 under the action of gravity.
[0036] The number and diameter of the reflux channels 4 are not limited here. It is necessary to ensure that the reflux medium flowing from the pump chamber 13 through the reflux channel 4 to the reflux chamber 5 is balanced with the leakage medium leaking from the mouth ring gap 32, so as to stabilize the medium in the pump body 1.
[0037] The height and width of the reflux chamber 5 are not limited here. It is necessary to ensure that the reflux chamber 5 can be connected with the reflux channel 4 and that the reflux chamber 5 does not cause turbulence to the medium at the pump inlet 11 .
[0038] The following examples illustrate the working process of the present invention in a specific application. It should be noted that the following content is only a specific application example of the present solution and does not constitute a limitation to the present solution.
[0039] The medium enters the flow channel of the guide vane cover plate 22 from the pump inlet 11 of the pump body 1, and the medium in the guide vane cover plate 22 enters the impeller 3 through the flow channel. The impeller rotates to flow the medium into the guide vane body 21, and finally the guide vane body 21 delivers the medium to the pump outlet 12 of the pump body. At this time, a small amount of medium leaks from the mouth ring gap 32 into the pump cavity 13.
[0040] The leaked medium in the pump chamber 13 flows into the reflux channel 4, enters the reflux chamber 5 through the reflux channel 4, and forms a reflux medium. The reflux medium flows into the pump inlet 11 through the bottom inner wall 51 of the reflux chamber 5 and enters the impeller 3 and the guide vane 2 again together with the medium in the pump inlet 11, and circulates back inside the pump body 1.
[0041] The utility model provides a high-temperature pump mouth ring leakage medium internal reflux structure, which arranges the reflux channel 4 and the reflux chamber 5 inside the pump body 1, and cooperates to circulate the leakage medium in the pump chamber 13 inside the pump body 1. The temperature of the reflux channel 4 and the reflux chamber 5 will not change too much, and there is no need to consider the problem of thermal expansion stress. The structure is simple and the cost is low.
[0042] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.
Claims
1. A high-temperature pump orifice ring leakage medium internal reflux structure, comprising a pump body (1) and an impeller (3) and a guide vane (2) arranged in the pump body (1), a orifice ring (31) is arranged outside the impeller (3), and there is a orifice ring gap (32) between the orifice ring (31) and the impeller (3), characterized in that: Also includes: a reflux chamber (5), the reflux chamber (5) being arranged on the pump inlet (11) of the pump body (1) and extending horizontally, and being in communication with the pump inlet (11), A reflux channel (4), wherein the reflux channel (4) is arranged in the pump body (1), one end of which is connected to the pump chamber (13) of the pump body (1), and the other end of which is arranged in the reflux chamber (5), so that the medium in the pump chamber (13) can flow into the reflux chamber (5) through the reflux channel (4) and then into the pump inlet (11).
2. The internal reflux structure of the high-temperature pump port ring leakage medium according to claim 1, characterized in that: The bottom inner wall (51) of the reflux chamber (5) is configured so that both ends are higher than the middle.
3. The internal reflux structure of the high-temperature pump port ring leakage medium according to claim 1, characterized in that: The caliber and number of the reflux channels (4) are configured so that the reflux medium in the pump chamber (13) flowing through the reflux channels (4) to the reflux chamber (5) is balanced with the leakage medium leaking from the mouth ring gap (32).
4. The internal reflux structure of the high-temperature pump port ring leakage medium according to claim 1, characterized in that: The guide vane (2) is arranged outside the impeller (3).
5. The internal reflux structure of the leakage medium of the high-temperature pump port ring according to claim 1 or 4, characterized in that: The guide vane (2) comprises a guide vane body (21) and a guide vane cover plate (22); the guide vane (2) is configured such that the guide vane cover plate (22) is arranged at the front end of the impeller (3), and the guide vane body (21) is arranged at the rear end of the impeller (3).
6. The internal reflux structure of the high-temperature pump port ring leakage medium according to claim 1, characterized in that: The pump inlet (11) is radially connected to the impeller (3).
7. The internal reflux structure of the high-temperature pump port ring leakage medium according to claim 6, characterized in that: The pump body (1) further comprises a pump outlet (12), wherein the pump outlet (12) is axially connected to the impeller (3).